From nobody Tue Oct 1 16:11:20 2019 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D8D38120100 for ; Tue, 1 Oct 2019 16:11:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iSgTf6_BVtrp for ; Tue, 1 Oct 2019 16:11:16 -0700 (PDT) Received: from mgny4.bloomberg.net (mgny4.bloomberg.net [69.191.192.152]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 972071200D5 for ; Tue, 1 Oct 2019 16:11:16 -0700 (PDT) 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charset="UTF-8" Hello Authors, Below are the comments on the draft. "[Ed.Note]: Use of O bit is still being discussed in the NVO3 WG, so the value is undetermined." [SPK] In some of the implementation that are using BFD over GENEVE have already started using O bit to indicate this is OAM packet and these packets are not being forwarded. We may need to set this in the GENEVE header for compatibility and have extra information for the new implementation. Any thoughts? "Since multiple BFD sessions may be running between two NVEs, and multiple BFD sessions may be originating or terminating at one NVE, there needs to be a mechanism for demultiplexing received BFD packets to the proper session." [SPK] BFD VXLAN https://tools.ietf.org/html/draft-ietf-bfd-vxlan-07 drafts there is good discussion going on if we need to define the motivation of the draft on what problem it solves if we have BFD per VNI. There are concerns about the scalability for the same. While we can still have BFD for subset of VNI or we can have BFD per VNI at sedate interval/demand mode and may use P/F sequence to poll when required. We can define supporting use case or when P/F sequence can be really used for example it can be used when data traffic for a given VNI has not been received for some duration. There should also be an option to run BFD session for management VNI along with BFD for per VNI. "Since multiple BFD sessions may be running between two NVEs, and multiple BFD sessions may be originating or terminating at one NVE, there needs to be a mechanism for demultiplexing received BFD packets to the proper session." [SPK] Above section in subtle way tries to talk about multiple BFD session between same pair but again we need to be clear on what is the motivation? These are my initial thoughts and would like to see good discussion over this draft. Please do let me know if you think we need to address them. Thanks Santosh P K --000000000000f241a80594022eca Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hello Authors,
=C2=A0 =C2=A0 Below are the comments on= the draft.=C2=A0

"[Ed.Note]: Use of O bit is still being discusse=
d in the NVO3 WG, so
   the value is undetermined."

[=
SPK] In some of the implementation that are using BFD over GENEVE have alre=
ady started using O bit to indicate this is OAM packet and these packets ar=
e not being forwarded. We may need to set this in the GENEVE header for com=
patibility and have extra information for the new implementation. Any thoug=
hts? 

=C2=A0"Since multiple BFD sessions may be running bet=
ween two NVEs, and multiple BFD sessions may be originating or terminating =
at one NVE, there needs to be a mechanism for demultiplexing received BFD p=
ackets to the proper session."

[SPK] BFD =
VXLAN=C2=A0=
https://tools.ietf.org/html/draft-ietf-bfd-vxlan-07=C2=A0drafts there i=
s good discussion going on if we need to define the motivation of the draft=
 on what problem it solves if we have BFD per VNI. There are concerns about=
 the scalability for the same. While we can still have BFD for subset of VN=
I or we can have BFD per VNI at sedate interval/demand mode and may use P/F=
 sequence to poll when required. We can define supporting use case or when =
P/F sequence can be really used for example it can be used when data traffi=
c for a given VNI has not been received for some duration. There should als=
o be an option to run BFD session for management VNI along with BFD for per=
 VNI.=C2=A0


=C2=A0"Since =
multiple BFD sessions may be running between two NVEs, and multiple BFD ses=
sions may be originating or terminating at one NVE, there needs to be a mec=
hanism for demultiplexing received BFD packets to the proper session."=



[SPK] Above section in subtle way tries to tal=
k about multiple BFD session between same pair but again we need to be clea=
r on what is the motivation?


These are my initi=
al thoughts and would like to see good discussion over this draft. Please d=
o let me know if you think we need to address them.=C2=A0


Thanks
Santosh P K=C2=A0
<=
/div>


--000000000000f241a80594022eca--


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From: Santosh P K 
Date: Thu, 3 Oct 2019 19:50:20 +0530
Message-ID: 
Subject: Re: BFD over VXLAN: Trapping BFD Control packet at VTEP
To: xiao.min2@zte.com.cn
Cc: Greg Mirsky , draft-ietf-bfd-vxlan@ietf.org,  Dinesh Dutt , rtg-bfd WG , Joel Halpern ,  "T. Sridhar" , bfd-chairs@ietf.org, nvo3@ietf.org
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Xiao,
   Thanks for your explanation. This helps a lot. I would wait for more
comments from others to see if this what we need in this draft to be
supported based on that we can provide appropriate sections in the draft.

Thanks
Santosh P K

On Wed, Sep 25, 2019 at 8:10 AM  wrote:

> Hi Santosh,
>
>
> With regard to the question whether we should allow multiple BFD sessions
> for the same VNI or not, IMHO we should allow it, more explanation as
> follows.
>
> Below is a figure derived from figure 2 of RFC8014 (An Architecture for
> Data-Center Network Virtualization over Layer 3 (NVO3)).
>
>                     |         Data Center Network (IP)        |
>                     |                                         |
>                     +-----------------------------------------+
>                          |                           |
>                          |       Tunnel Overlay      |
>             +------------+---------+       +---------+------------+
>             | +----------+-------+ |       | +-------+----------+ |
>             | |  Overlay Module  | |       | |  Overlay Module  | |
>             | +---------+--------+ |       | +---------+--------+ |
>             |           |          |       |           |          |
>      NVE1   |           |          |       |           |          | NVE2
>             |  +--------+-------+  |       |  +--------+-------+  |
>             |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
>             |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
>             |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
>             +----+-----+----+------+       +----+-----+-----+-----+
>                  |     |    |                   |     |     |
>                  |     |    |                   |     |     |
>                  |     |    |                   |     |     |
>           -------+-----+----+-------------------+-----+-----+-------
>                  |     |    |     Tenant        |     |     |
>             TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>                 +---+ +---+ +---+             +---+ +---+   +---+
>                 |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>                 +---+ +---+ +---+             +---+ +---+   +---+
>
> To my understanding, the BFD sessions between NVE1 and NVE2 are actually
> initiated and terminated at VAP of NVE.
>
> If the network operator want to set up one BFD session between VAP1 of
> NVE1 and VAP1of NVE2, at the same time another BFD session between VAP3 o=
f
> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same
> VNI1, I believe it's reasonable, so that's why I think we should allow it=
.
>
>
> Of course, in RFC8014 it also says:
>
> "Note that two different Tenant Systems (and TSIs) attached to a common N=
VE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as they connect =
to the same Virtual Network."
>
> Some people may argue that all Tenant Systems connecting to the same
> Virtual Network MUST share one VAP, if that's true, then VAP1 and VAP3
> should merge into one VAP and my explanation doesn't work. Copying to NVO=
3
> WG to involve more experts, hope for your clarifications and comments.
>
>
> Best Regards,
>
> Xiao Min
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*SantoshPK 
> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Greg Mirsky =
;
> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*draft-ietf-bfd-vxlan@ietf.org ;Dinesh
> Dutt ;rtg-bfd WG ;Joel M. Halpern <
> jmh@joelhalpern.com>;T. Sridhar ;bfd-chairs@ietf.org
> ;
> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8823=E6=97=A5 05:39
> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: BFD over VXLAN: Trapping BFD Control =
packet at VTEP*
> Greg,
>     Please see inline reply tagged [SPK]. I have added text requested.
>
> Thanks
> Santosh P K
>
> On Fri, Aug 16, 2019 at 4:59 AM Greg Mirsky  > wrote:
>
>> Hi Santosh,
>> thank you for your comments. Please find my notes in-lined and tagged
>> GIM>>.
>>
>> Regards,
>> Greg
>>
>> On Tue, Aug 13, 2019 at 10:24 PM Santosh P K <
>> santosh.pallagatti@gmail.com> wrote:
>>
>>> Greg,
>>>    Thanks for updated version of document. Here are few comments on new
>>> draft.
>>>
>>> Section 4:
>>> Destination MAC: This MUST NOT be of one of tenant's MAC
>>>          addresses.  The MAC address MAY be configured, or it MAY be
>>>          learned via a control plane protocol.  The details of how the
>>>          MAC address is obtained are outside the scope of this document=
.
>>>
>>> I think we may need to give background on why we are saying MAC address
>>> MUST not be one of tenant's MAC address. Like in this thread we have
>>> discussed one of the tenant could have borrowed the same VTEP mac addre=
ss
>>> and we if we have to use BFD then we need to avoid that conflict to ens=
ure
>>> BFD packets get observed in the VTEP itself. Should we add a section be=
fore
>>> 4 to set that context so that above text makes more sense in that conte=
xt?
>>>
>> GIM>> Certainly. Please share the text you'd like to add.
>>
>
> [SPK]  Proposed text for why we should not use VTEP MAX address as tenant
> MAC address.
>
> "In some scenarios tenant MAC is borrowed from VTEP MAC address. VXLAN BF=
D
> MUST terminate BFD session at VTEP and MUST not forward BFD packets to
> tenants. To terminate VXLAN BFD packets at VTEP, deployment MUST ensure
> that there are no tenant VM which barrows VTEP MAC address."
>
>
>>>
>>>    IP header:
>>>          Destination IP: IP address MUST NOT be of one of tenant's IP
>>>          addresses.  IP address MAY be selected from the range 127/8 fo=
r
>>>          IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
>>>
>>>          TTL: MUST be set to 1 to ensure that the BFD packet is not
>>>          routed within the L3 underlay network.
>>>
>>>
>>> I think we have added some text to address Sridhar comments on why TTL
>>> MUST be 1 and dest IP address MUST be 127/8 range. I see that text is
>>> missing now.
>>>
>> GIM>> My apologies that I've missed to include the text from another
>> discussion thread. I believe the following would be complete:
>>           TTL or Hop Limit: MUST be set to 1 to ensure that the BFD
>>          packet is not routed within the Layer 3 underlay network.  This
>>          addresses the scenario when the inner IP destination address is
>>          of VXLAN gateway and there is a router in underlay which
>>          removes the VXLAN header, then it is possible to route the
>>          packet as VXLAN  gateway address is routable address.
>>
>
> [SPK] This text looks good.
>
>>
>>> Section 5.1:
>>> For such packets, the BFD session MUST be identified
>>>    using the following three-tuples of fields of the inner header: the
>>>    source IP, the destination IP, and the source UDP port number presen=
t
>>>    in the IP header carried by the payload of the packet in VXLAN
>>>    encapsulation.  If BFD packet is received with non-zero Your
>>> Discriminator, then BFD session MUST be demultiplexed only with Your
>>>    Discriminator as the key.
>>>
>>> Just with 3 tuple we will not be able to demux packet. We need to
>>> consider VNI as well if we have multiple BFD session between same pair =
of
>>> VTEP.
>>>
>> GIM>> This is one of comments from Carlos we need to address. Your
>> comment have helped me to form the question:
>>
>> What is the goal running multiple BFD sessions between the pair of VTEPs=
?
>>
>>
> [SPK] The goal of the multiple BFD session is to ensure check liveliness
> of VXLAN tunnel. There is already a good amount of debate on this topic
> that do we really need that? As per RFC 5884 we are running BFD per LSP a=
nd
> we might hit scale issues there too. I think it is up to operator to deci=
de
> how they want to use multiple BFD session per VXLAN tunnel. It could be
> possible that BFD session with special VNI is run at aggressive interval
> where as MAY have multiple BFD sessions for different VNI at a sedate
> interval, for that matter they could be running in demand mode as well (r=
un
> P/F sequence only when there is no data following for that VNI). As WG if
> we think running multiple BFD session make sense then we might need to ad=
d
> appropriate text.
>
> If the goal is to monitor per VNI, then the following text should describ=
e
>> the demultiplexing of the initial BFD Control packet:
>>    Demultiplexing of IP BFD packet has been defined in Section 3 of
>>    [RFC5881].  Since multiple BFD sessions may be running between two
>>    VTEPs, there needs to be a mechanism for demultiplexing received BFD
>>    packets to the proper session.  For demultiplexing packets with Your
>>    Discriminator equal to 0, a BFD session MUST be identified using the
>>    logical link over which the BFD Control packet is received.  In the
>>    case of VXLAN, the VNI number identifies that logical link.  If BFD
>>    packet is received with non-zero Your Discriminator, then BFD session
>>    MUST be demultiplexed only with Your Discriminator as the key.
>>
>
> [SPK]  I think this text for multiple BFD session between same pair of
> VTEPs for multiple VNI makes sense only if as WG we think that could be u=
se
> case.
>
> Would there be need to run multiple BFD sessions with the same VNI number=
?
>>
>
> [SPK] IMHO we should not allow multiple BFD session for the same VNI.
>
>
>>
>>
>>>
>>> Thanks
>>> Santosh P K
>>>
>>>
>>> On Fri, Aug 9, 2019 at 4:27 AM Greg Mirsky 
>>> wrote:
>>>
>>>> Dinesh, thank you for your help, much appreciated.
>>>> Hi Joel and Sridhar,
>>>> could you please check if the updated text on the inner Ethernet frame
>>>> addressed your concern.
>>>>
>>>> On Wed, Aug 7, 2019 at 2:25 PM Dinesh Dutt  wrote:
>>>>
>>>>> Looks god to me Greg. Thank you for your hard work in this,
>>>>>
>>>>> Dinesh
>>>>>
>>>>> On Wed, Aug 7, 2019 at 9:25 AM Greg Mirsky 
>>>>> wrote:
>>>>>
>>>>>> Hi Dinesh, Joel, Sridhar, et al.,
>>>>>> much appreciate the help you've given me sharing your expertise. I
>>>>>> hope that the updates you will find in the attached diff and the wor=
king
>>>>>> copy of the draft be closer to the acceptable solution for VTEP-VTEP=
 BFD.
>>>>>> Please note, that I'll shortly start a new discussion thread to addr=
ess one
>>>>>> of Carlos's questions on the ambiguity of the text on multiple concu=
rrent
>>>>>> sessions between the same pair of VTEPs.
>>>>>> Please review the changes to Sections 4 and 6 and share your
>>>>>> feedback, suggestions, and questions.
>>>>>>
>>>>>> Regards,
>>>>>> Greg
>>>>>>
>>>>>> On Mon, Aug 5, 2019 at 6:03 PM Dinesh Dutt  wrote:
>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Mon, Aug 5, 2019 at 5:56 PM Greg Mirsky 
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Hi Dinesh,
>>>>>>>> thank you for your expedient detailed response.
>>>>>>>> I believe that the ability to run BFD session up to a tenant
>>>>>>>> (VTEP-VTEP-tenant or tenant-tenant) was never in jeopardy from thi=
s
>>>>>>>> specification.
>>>>>>>> I'm trying to provide precise specification on what can be used ad
>>>>>>>> the destination MAC and IP addresses in the inner frame/packet as =
I believe
>>>>>>>> that likely will help to avoid interoperability issues.
>>>>>>>> I'm interested to learn some more about the "martian checking"
>>>>>>>> function. As you know, martian addresses have been used as destina=
tion IP
>>>>>>>> address in LSP Ping and BFD over MPLS LSP and PW. I haven't heard =
that any
>>>>>>>> silicon feature caused problems for operators using these tools.
>>>>>>>>
>>>>>>>
>>>>>>> Interesting. I didn't know this aspect of use with MPLS ping. Did
>>>>>>> those packets ever go through a firewall though? In any case, maybe=
 suggest
>>>>>>> the use of those addresses with a statement that this is how LSP do=
es it,
>>>>>>> but that other MAC/IP pairs are possible as long as the conditions =
of the
>>>>>>> endpoint owning the MAC/IP was honored.
>>>>>>>
>>>>>>> Dinesh
>>>>>>>
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> Greg
>>>>>>>>
>>>>>>>> On Mon, Aug 5, 2019 at 3:59 PM Dinesh Dutt 
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> Hi Greg,
>>>>>>>>>
>>>>>>>>> That we agree on the problem definition is the first step forward=
.
>>>>>>>>> Your original document had my cases covered and so I was surprise=
d by the
>>>>>>>>> track this thread took. It doesn't matter, we're back on track.
>>>>>>>>>
>>>>>>>>> My recommendation is to not worry about specifying the precise
>>>>>>>>> MAC/IP address used in the inner header. The addresses chosen MUS=
T ensure
>>>>>>>>> that the packet is trapped to the control plane of the VTEP and n=
ot escape
>>>>>>>>> to the tenant if the BFD is to the VTEP. Any solution MUST also n=
ot
>>>>>>>>> preclude the use of the BFD by tenant systems for that VNI. There=
 are many
>>>>>>>>> ways an implementer can choose to implement this. For example, th=
e inner
>>>>>>>>> MAC address is whatever the VTEP implementer would return if ARP'=
d for the
>>>>>>>>> IP address used in the inner header in the given VNI. The impleme=
nter can
>>>>>>>>> pick a fixed MAC address, one that they own etc. Multiple BFD ses=
sions can
>>>>>>>>> be run for testing path connectivity on more than one VNIs. Limit=
s should
>>>>>>>>> be in place to avoid overwhelming the receiver with BFD messages =
(you had
>>>>>>>>> words about this in your currently published draft).  If the VNI =
is
>>>>>>>>> irrelevant in the test i.e. only the VXLAN pipe at the VTEP is be=
ing
>>>>>>>>> tested. the user can use any VNI active on the VTEP on which the =
VTEP owns
>>>>>>>>> an IP address.
>>>>>>>>>
>>>>>>>>> I'm concerned about the use of 127/8 address only because of
>>>>>>>>> firewalls or implementations that drop packets with these address=
es as
>>>>>>>>> either the source or destination. For example, on many merchant s=
ilicon, I
>>>>>>>>> don't believe you can turn off martian checking and drops *only* =
for
>>>>>>>>> VXLAN-encapsulated BFD packets. I don't know what the Linux kerne=
l does
>>>>>>>>> today on such packets, for example (or Hyper-V). I'd like a solut=
ion that
>>>>>>>>> doesn't demand additional or new chip functionality or require ad=
ditional
>>>>>>>>> middle-box hole punch.
>>>>>>>>>
>>>>>>>>> Why do you feel you MUST to specify the MAC/IP address on the
>>>>>>>>> inner packet? What am I missing here?
>>>>>>>>>
>>>>>>>>> Dinesh
>>>>>>>>>
>>>>>>>>> On Mon, Aug 5, 2019 at 3:04 PM Greg Mirsky 
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>> Hi Dinesh,
>>>>>>>>>> what do you see as the way forward? I agree, that the proposed
>>>>>>>>>> text doesn't work for multi-VNI concurrent monitoring because th=
ese VNIs
>>>>>>>>>> are tenant's VNIs. And in that case, we need to specify another =
mechanism
>>>>>>>>>> to trap the BFD Control packet at VTEP. It seems that VTEP's Eth=
ernet
>>>>>>>>>> address must be used as the destination MAC address in the inner=
 Ethernet
>>>>>>>>>> frame. The destination IP address may be either VTEP's address o=
f martian
>>>>>>>>>> (I do prefer martian). Let me give it  try:
>>>>>>>>>> NEW TEXT:
>>>>>>>>>>
>>>>>>>>>> To monitor continuity of the path between two VTEPs, an operator
>>>>>>>>>> MUST select a VNI number to be used as Management VNI. Managemen=
t VNI
>>>>>>>>>> number MUST NOT be one of the tenant's VNIs to prevent sending V=
XLAN
>>>>>>>>>> packets received on Management VNI to a tenant. VNI number 1 is =
RECOMMENDED
>>>>>>>>>> as the default for Management VNI. [Ed.note: What we set the Des=
tination
>>>>>>>>>> MAC to? Can it be invalid MAC that MUST be ignored on receipt?]
>>>>>>>>>>
>>>>>>>>>> If an implementation supports concurrent monitoring of multiple
>>>>>>>>>> VNIs, then the value of VNI number MAY be one of tenant's VNIs. =
The
>>>>>>>>>> destination MAC address in the inner Ethernet frame encapsulatin=
g BFD
>>>>>>>>>> Control packet MUST be MAC associated with the remote VTEP.
>>>>>>>>>> The destination IP address of the inner IP packet MUST be
>>>>>>>>>> selected from the range 127/8 for IPv4, and for IPv6 from the ra=
nge
>>>>>>>>>> 0:0:0:0:0:FFFF:7F00:0/104. The TTL value in the inner IP header =
MUST be set
>>>>>>>>>> to 1.
>>>>>>>>>>
>>>>>>>>>> Regards,
>>>>>>>>>> Greg
>>>>>>>>>>
>>>>>>>>>> On Sun, Aug 4, 2019 at 9:07 AM Dinesh Dutt 
>>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>>> Hi Greg,
>>>>>>>>>>>
>>>>>>>>>>> Thanks for your clarifications. I agree with your sentiment on
>>>>>>>>>>> why you're running BFD over VXLAN between VTEPs. I wasn't argui=
ng against
>>>>>>>>>>> it at all. All I was saying was pointing to the limitations of =
the use of
>>>>>>>>>>> management VNI. I spoke to some operators who're running EVPN a=
nd mentioned
>>>>>>>>>>> the discussion on this thread. They concur that they're using s=
pecific VNIs
>>>>>>>>>>> to test connectivity over that VNI between VTEPs to ensure misc=
onfiguration
>>>>>>>>>>> doesn't lead to blackholes. My statements are based in real wor=
ld operator
>>>>>>>>>>> experience. And I was providing language that ensured packets d=
idn't leak
>>>>>>>>>>> across to tenants when they were destined to VTEPs.
>>>>>>>>>>>
>>>>>>>>>>> Dinesh
>>>>>>>>>>>
>>>>>>>>>>> On Sat, Aug 3, 2019 at 10:34 AM Greg Mirsky <
>>>>>>>>>>> gregimirsky@gmail.com> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Hi Dinesh,
>>>>>>>>>>>> many thanks for your detailed updates on how some
>>>>>>>>>>>> implementations process VXLAN header and the inner Ethernet fr=
ame. These
>>>>>>>>>>>> are very helpful in achieving the workable solution for the pr=
oblem at hand.
>>>>>>>>>>>> You've noted that a path between VTEPs may be monitored in the
>>>>>>>>>>>> underlay network by merely establishing a BFD session. That is=
 true, but by
>>>>>>>>>>>> using BFD with VXLAN encapsulation between the pair of VTEPs w=
e are
>>>>>>>>>>>> extending the OAM domain by including, to some extent, VXLAN f=
orwarding
>>>>>>>>>>>> engine. Abstract in RFC 5880 defines the goal and the domain i=
n which BFD
>>>>>>>>>>>> protocol can detect a fault as:
>>>>>>>>>>>>    This document describes a protocol intended to detect fault=
s
>>>>>>>>>>>> in the
>>>>>>>>>>>>    bidirectional path between two forwarding engines, includin=
g
>>>>>>>>>>>>    interfaces, data link(s), and to the extent possible the
>>>>>>>>>>>> forwarding
>>>>>>>>>>>>    engines themselves, with potentially very low latency.
>>>>>>>>>>>> Thus, BFD in the underlay will exercise a part of IP forwardin=
g
>>>>>>>>>>>> engine while BFD with VXLAN encapsulation, ran between the sam=
e pair of
>>>>>>>>>>>> VTEPs, extends the OAM domain. At the same time, defining BFD =
between
>>>>>>>>>>>> tenant systems in outside the goal of this specification. But =
VXLAN BFD
>>>>>>>>>>>> session between VTEPs may be useful in monitoring e2e path bet=
ween tenants,
>>>>>>>>>>>> as described in the update to -07:
>>>>>>>>>>>>    At the same time, a service layer BFD session may be used
>>>>>>>>>>>> between the
>>>>>>>>>>>>    tenants of VTEPs IP1 and IP2 to provide end-to-end fault
>>>>>>>>>>>> management.
>>>>>>>>>>>>    In such case, for VTEPs BFD control packets of that session
>>>>>>>>>>>> are
>>>>>>>>>>>>    indistinguishable from data packets.  If end-to-end defect
>>>>>>>>>>>> detection
>>>>>>>>>>>>    is realized as the set of concatenated OAM domains, e.g.,
>>>>>>>>>>>> VM1-1 - IP1
>>>>>>>>>>>>    -- IP2 - VM2-1, then the BFD session over VXLAN between
>>>>>>>>>>>> VTEPs SHOULD
>>>>>>>>>>>>    follow the procedures described in Section 6.8.17 [RFC5880]=
.
>>>>>>>>>>>> I've attached the current working version of the draft.
>>>>>>>>>>>>
>>>>>>>>>>>> Regards,
>>>>>>>>>>>> Greg
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On Fri, Aug 2, 2019 at 5:43 PM Dinesh Dutt 
>>>>>>>>>>>> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>> What I mean is "How do you infer that it excludes the case I'=
m
>>>>>>>>>>>>> talking about?".
>>>>>>>>>>>>>
>>>>>>>>>>>>> Dinesh
>>>>>>>>>>>>>
>>>>>>>>>>>>> On Fri, Aug 2, 2019 at 5:41 PM Dinesh Dutt 
>>>>>>>>>>>>> wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>>> The abstract reads this: "
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> This document describes the use of the Bidirectional Forward=
ing
>>>>>>>>>>>>>>    Detection (BFD) protocol in point-to-point Virtual eXtens=
ible Local
>>>>>>>>>>>>>>    Area Network (VXLAN) tunnels forming up an overlay networ=
k."
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> How do you infer what you said?
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Dinesh
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Fri, Aug 2, 2019 at 5:38 PM Joel M. Halpern <
>>>>>>>>>>>>>> jmh@joelhalpern.com> wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> I am going by what the draft says its purpose is.  If you
>>>>>>>>>>>>>>> (Dinesh) want
>>>>>>>>>>>>>>> the draft to fulfill a different purpose, then either ask
>>>>>>>>>>>>>>> the chairs to
>>>>>>>>>>>>>>> take this draft back to the WG, or write a separate draft.
>>>>>>>>>>>>>>> As currently written, the behavior Greg proposed meets the
>>>>>>>>>>>>>>> needs, and
>>>>>>>>>>>>>>> does so in a way that is consistent with VxLAN.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Yours,
>>>>>>>>>>>>>>> Joel
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> On 8/2/2019 8:30 PM, Dinesh Dutt wrote:
>>>>>>>>>>>>>>> > What is the stated purpose of this BFD session? The VTEP
>>>>>>>>>>>>>>> reachability is
>>>>>>>>>>>>>>> > determined by the underlay, I don't need VXLAN-encaped
>>>>>>>>>>>>>>> packet for that.
>>>>>>>>>>>>>>> > Do we agree?
>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>> > If I want to test the VXLAN encap/decap functionality
>>>>>>>>>>>>>>> alone, picking any
>>>>>>>>>>>>>>> > single VNI maybe fine. But is this all any network
>>>>>>>>>>>>>>> operator wants? Why?
>>>>>>>>>>>>>>> > In what situations has this been a problem? I suspect
>>>>>>>>>>>>>>> operators also
>>>>>>>>>>>>>>> > want to verify path continuity over a specific VNI. If yo=
u
>>>>>>>>>>>>>>> say this is
>>>>>>>>>>>>>>> > not defined by the document, I disagree because the
>>>>>>>>>>>>>>> current version
>>>>>>>>>>>>>>> > talks about controlling the number of BFD sessions betwee=
n
>>>>>>>>>>>>>>> the VTEPs
>>>>>>>>>>>>>>> > (see section 3). More importantly, this is a real problem
>>>>>>>>>>>>>>> that operators
>>>>>>>>>>>>>>> > like to verify.
>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>> > Dinesh
>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>> > On Fri, Aug 2, 2019 at 5:08 PM Joel M. Halpern <
>>>>>>>>>>>>>>> jmh@joelhalpern.com
>>>>>>>>>>>>>>> > > wrote:
>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>> >     What is special about the management VNI is precisely
>>>>>>>>>>>>>>> that it is NOT a
>>>>>>>>>>>>>>> >     tenant VNI.  The VxLAN administration does know how i=
t
>>>>>>>>>>>>>>> allocates VNI to
>>>>>>>>>>>>>>> >     tenants, and which VNI it has allocated.  In contrast=
,
>>>>>>>>>>>>>>> it does not know
>>>>>>>>>>>>>>> >     which IP addresses or MAC adddresses teh tenant is
>>>>>>>>>>>>>>> using or may plan
>>>>>>>>>>>>>>> >     to use.
>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>> >     Yours,
>>>>>>>>>>>>>>> >     Joel
>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>> >     On 8/2/2019 6:41 PM, Dinesh Dutt wrote:
>>>>>>>>>>>>>>> >      > The assumption of an IP address within any VNI is
>>>>>>>>>>>>>>> suspect that way.
>>>>>>>>>>>>>>> >      > What's special about a single VNI, the management
>>>>>>>>>>>>>>> VNI? The VTEP IP
>>>>>>>>>>>>>>> >      > address does not belong in reality in any VNI...
>>>>>>>>>>>>>>> >      >
>>>>>>>>>>>>>>> >      > Dinesh
>>>>>>>>>>>>>>> >      >
>>>>>>>>>>>>>>> >      > On Fri, Aug 2, 2019 at 3:17 PM Joel M. Halpern
>>>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      > >>>>>>>>>>>>>> jmh@joelhalpern.com>>> wrote:
>>>>>>>>>>>>>>> >      >
>>>>>>>>>>>>>>> >      >     Your response seems to miss two points:
>>>>>>>>>>>>>>> >      >
>>>>>>>>>>>>>>> >      >     First, the problem you describe is not what th=
e
>>>>>>>>>>>>>>> document says
>>>>>>>>>>>>>>> >     it is
>>>>>>>>>>>>>>> >      >     solving.  To the degree it discusses it at all=
,
>>>>>>>>>>>>>>> the document
>>>>>>>>>>>>>>> >     says "
>>>>>>>>>>>>>>> >      >       In
>>>>>>>>>>>>>>> >      >     most cases, a single BFD session is sufficient
>>>>>>>>>>>>>>> for the given
>>>>>>>>>>>>>>> >     VTEP to
>>>>>>>>>>>>>>> >      >     monitor the reachability of a remote VTEP,
>>>>>>>>>>>>>>> regardless of the
>>>>>>>>>>>>>>> >     number of
>>>>>>>>>>>>>>> >      >     VNIs in common. "
>>>>>>>>>>>>>>> >      >
>>>>>>>>>>>>>>> >      >     Second, you assume the existence of an IP
>>>>>>>>>>>>>>> address for a VTEP
>>>>>>>>>>>>>>> >     within a
>>>>>>>>>>>>>>> >      >     VNI.  As with the MAC address, the VTEP does
>>>>>>>>>>>>>>> not have an IP
>>>>>>>>>>>>>>> >     address
>>>>>>>>>>>>>>> >      >     within the VNI.  Some implementations may have
>>>>>>>>>>>>>>> created such a
>>>>>>>>>>>>>>> >     thing,
>>>>>>>>>>>>>>> >      >     but
>>>>>>>>>>>>>>> >      >     the general construct, as defined to date, doe=
s
>>>>>>>>>>>>>>> not support such.
>>>>>>>>>>>>>>> >      >
>>>>>>>>>>>>>>> >      >     In short, you are requiring a behavior that
>>>>>>>>>>>>>>> violates the
>>>>>>>>>>>>>>> >     architectural
>>>>>>>>>>>>>>> >      >     structure of overlay / underlay separation, an=
d
>>>>>>>>>>>>>>> common
>>>>>>>>>>>>>>> >     usage.  And you
>>>>>>>>>>>>>>> >      >     are doing so to support a use case that the
>>>>>>>>>>>>>>> working group has not
>>>>>>>>>>>>>>> >      >     indicated in the document as important.
>>>>>>>>>>>>>>> >      >
>>>>>>>>>>>>>>> >      >     Yours,
>>>>>>>>>>>>>>> >      >     Joel
>>>>>>>>>>>>>>> >      >
>>>>>>>>>>>>>>> >      >     On 8/2/2019 5:01 PM, Dinesh Dutt wrote:
>>>>>>>>>>>>>>> >      >      > Joel,
>>>>>>>>>>>>>>> >      >      >
>>>>>>>>>>>>>>> >      >      > You understood correctly.
>>>>>>>>>>>>>>> >      >      >
>>>>>>>>>>>>>>> >      >      > The VNIs may not share fate due to
>>>>>>>>>>>>>>> misconfiguration. And I
>>>>>>>>>>>>>>> >     strongly
>>>>>>>>>>>>>>> >      >      > suspect someone will want to use BFD for
>>>>>>>>>>>>>>> that because its
>>>>>>>>>>>>>>> >     about
>>>>>>>>>>>>>>> >      >     checking
>>>>>>>>>>>>>>> >      >      > path continuity as stated by the draft. As
>>>>>>>>>>>>>>> long as there's a
>>>>>>>>>>>>>>> >      >     valid IP
>>>>>>>>>>>>>>> >      >      > (because it's BFD) owned by the VTEP in tha=
t
>>>>>>>>>>>>>>> VNI, you can
>>>>>>>>>>>>>>> >     use BFD in
>>>>>>>>>>>>>>> >      >      > that VNI. Thats all that you need to
>>>>>>>>>>>>>>> dictate.  That IP address
>>>>>>>>>>>>>>> >      >     has a MAC
>>>>>>>>>>>>>>> >      >      > address and you can use that on the inner
>>>>>>>>>>>>>>> frame. That is
>>>>>>>>>>>>>>> >     all normal
>>>>>>>>>>>>>>> >      >      > VXLAN processing. The outer IP is always
>>>>>>>>>>>>>>> that of the VTEP.
>>>>>>>>>>>>>>> >      >      >
>>>>>>>>>>>>>>> >      >      > Dinesh
>>>>>>>>>>>>>>> >      >      >
>>>>>>>>>>>>>>> >      >      > On Fri, Aug 2, 2019 at 11:03 AM Joel M.
>>>>>>>>>>>>>>> Halpern
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> jmh@joelhalpern.com>
>>>>>>>>>>>>>>> >     >>>>>>>>>>>>>> jmh@joelhalpern.com>>
>>>>>>>>>>>>>>> >      >      > >>>>>>>>>>>>>> jmh@joelhalpern.com>
>>>>>>>>>>>>>>> >     >>>>>>>>>>>>>> jmh@joelhalpern.com>>>> wrote:
>>>>>>>>>>>>>>> >      >      >
>>>>>>>>>>>>>>> >      >      >     If I am reading your various emails
>>>>>>>>>>>>>>> correctly Dinesh
>>>>>>>>>>>>>>> >     (and I
>>>>>>>>>>>>>>> >      >     may have
>>>>>>>>>>>>>>> >      >      >     missed something) you are trying to use
>>>>>>>>>>>>>>> the MAC address
>>>>>>>>>>>>>>> >      >     because you
>>>>>>>>>>>>>>> >      >      >     want
>>>>>>>>>>>>>>> >      >      >     to be able to send these BFD packets
>>>>>>>>>>>>>>> over arbitrary VNI to
>>>>>>>>>>>>>>> >      >     monitor the
>>>>>>>>>>>>>>> >      >      >     VNI.  That is not a requirement
>>>>>>>>>>>>>>> identified in the
>>>>>>>>>>>>>>> >     document.
>>>>>>>>>>>>>>> >      >     It is not
>>>>>>>>>>>>>>> >      >      >     even a problem I understand, since all
>>>>>>>>>>>>>>> the VNI between an
>>>>>>>>>>>>>>> >      >     ingress and
>>>>>>>>>>>>>>> >      >      >     egress VTEP share fate.
>>>>>>>>>>>>>>> >      >      >
>>>>>>>>>>>>>>> >      >      >     Yours,
>>>>>>>>>>>>>>> >      >      >     Joel
>>>>>>>>>>>>>>> >      >      >
>>>>>>>>>>>>>>> >      >      >     On 8/2/2019 1:44 PM, Dinesh Dutt wrote:
>>>>>>>>>>>>>>> >      >      >      > Thanks for verifying this. On Linux
>>>>>>>>>>>>>>> and hardware
>>>>>>>>>>>>>>> >     routers
>>>>>>>>>>>>>>> >      >     that I'm
>>>>>>>>>>>>>>> >      >      >     aware
>>>>>>>>>>>>>>> >      >      >      > of (Cisco circa 2012 and Cumulus),
>>>>>>>>>>>>>>> the physical MAC
>>>>>>>>>>>>>>> >     address is
>>>>>>>>>>>>>>> >      >      >     reused
>>>>>>>>>>>>>>> >      >      >      > across the VNIs on the VTEP. Did you
>>>>>>>>>>>>>>> check on a non-VMW
>>>>>>>>>>>>>>> >      >     device?
>>>>>>>>>>>>>>> >      >      >     This is
>>>>>>>>>>>>>>> >      >      >      > more for my own curiosity.
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      > To address the general case, can we
>>>>>>>>>>>>>>> not define a
>>>>>>>>>>>>>>> >      >     well-known (or
>>>>>>>>>>>>>>> >      >      >     reserve
>>>>>>>>>>>>>>> >      >      >      > one) unicast MAC address for use wit=
h
>>>>>>>>>>>>>>> VTEP? If the MAC
>>>>>>>>>>>>>>> >      >     address is
>>>>>>>>>>>>>>> >      >      >      > configurable in BFD command, this ca=
n
>>>>>>>>>>>>>>> be moot.
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      > Dinesh
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      > On Fri, Aug 2, 2019 at 10:27 AM
>>>>>>>>>>>>>>> Santosh P K
>>>>>>>>>>>>>>> >      >      >      > >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> 
>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> 
>>>>>>>>>>>>>>> >     >>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> 
>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> 
>>>>>>>>>>>>>>> >     >>>> wrote:
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      >     I have cross checked point raise=
d
>>>>>>>>>>>>>>> about MAC address
>>>>>>>>>>>>>>> >      >     usage. It is
>>>>>>>>>>>>>>> >      >      >      >     possible that tenant could be
>>>>>>>>>>>>>>> using physical MAC
>>>>>>>>>>>>>>> >      >     address and
>>>>>>>>>>>>>>> >      >      >     when a
>>>>>>>>>>>>>>> >      >      >      >     packet comes with valid VNI with
>>>>>>>>>>>>>>> a MAC address
>>>>>>>>>>>>>>> >     that is
>>>>>>>>>>>>>>> >      >     being
>>>>>>>>>>>>>>> >      >      >     used by
>>>>>>>>>>>>>>> >      >      >      >     tenant then packet will be sent
>>>>>>>>>>>>>>> to that tenant.
>>>>>>>>>>>>>>> >     This rules
>>>>>>>>>>>>>>> >      >      >     out the
>>>>>>>>>>>>>>> >      >      >      >     fact that we could use physical
>>>>>>>>>>>>>>> MAC address as
>>>>>>>>>>>>>>> >     inner
>>>>>>>>>>>>>>> >      >     MAC to
>>>>>>>>>>>>>>> >      >      >     ensure
>>>>>>>>>>>>>>> >      >      >      >     packets get terminated at VTEP
>>>>>>>>>>>>>>> itself.
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      >     Thanks
>>>>>>>>>>>>>>> >      >      >      >     Santosh P K
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      >     On Wed, Jul 31, 2019 at 11:00 AM
>>>>>>>>>>>>>>> Santosh P K
>>>>>>>>>>>>>>> >      >      >      >     >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> 
>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> 
>>>>>>>>>>>>>>> >     >>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> 
>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> 
>>>>>>>>>>>>>>> >     >>>>
>>>>>>>>>>>>>>> >      >      >      >     wrote:
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      >         Joel,
>>>>>>>>>>>>>>> >      >      >      >             Thanks for your inputs. =
I
>>>>>>>>>>>>>>> checked
>>>>>>>>>>>>>>> >      >     implementation within
>>>>>>>>>>>>>>> >      >      >      >         Vmware. Perhaps I should hav=
e
>>>>>>>>>>>>>>> been more clear
>>>>>>>>>>>>>>> >      >     about MAC
>>>>>>>>>>>>>>> >      >      >     address
>>>>>>>>>>>>>>> >      >      >      >         space while checking
>>>>>>>>>>>>>>> internally. I will cross
>>>>>>>>>>>>>>> >      >     check again for
>>>>>>>>>>>>>>> >      >      >      >         the same and get back on thi=
s
>>>>>>>>>>>>>>> list.
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      >         Thanks
>>>>>>>>>>>>>>> >      >      >      >         Santosh P K
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      >         On Wed, Jul 31, 2019 at 10:5=
4
>>>>>>>>>>>>>>> AM Joel M.
>>>>>>>>>>>>>>> >     Halpern
>>>>>>>>>>>>>>> >      >      >      >         >>>>>>>>>>>>>> 
>>>>>>>>>>>>>>> >      >>>>>>>>>>>>>> jmh@joelhalpern.com
>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> jmh@joelhalpern.com>
>>>>>>>>>>>>>>> >     >>>>>>>>>>>>>> jmh@joelhalpern.com>>>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >      >>>>>>>>>>>>>> jmh@joelhalpern.com
>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> jmh@joelhalpern.com>
>>>>>>>>>>>>>>> >     >>>>>>>>>>>>>> jmh@joelhalpern.com>>>>> wrote:
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      >             Sorry to ask a stupid
>>>>>>>>>>>>>>> question.  Whose
>>>>>>>>>>>>>>> >      >     implementation?
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      >             The reason I ask is that
>>>>>>>>>>>>>>> as far as I
>>>>>>>>>>>>>>> >     can tell,
>>>>>>>>>>>>>>> >      >     since the
>>>>>>>>>>>>>>> >      >      >      >             tenant does not
>>>>>>>>>>>>>>> >      >      >      >             have any control access
>>>>>>>>>>>>>>> to the VTEP,
>>>>>>>>>>>>>>> >     there is no
>>>>>>>>>>>>>>> >      >      >     reason for
>>>>>>>>>>>>>>> >      >      >      >             the VTEP to
>>>>>>>>>>>>>>> >      >      >      >             have a MAC address in th=
e
>>>>>>>>>>>>>>> tenant
>>>>>>>>>>>>>>> >     space.  Yes, the
>>>>>>>>>>>>>>> >      >      >     device has
>>>>>>>>>>>>>>> >      >      >      >             a physical
>>>>>>>>>>>>>>> >      >      >      >             MAC address.  But the
>>>>>>>>>>>>>>> tenant could well be
>>>>>>>>>>>>>>> >      >     using that MAC
>>>>>>>>>>>>>>> >      >      >      >             address.  Yes,
>>>>>>>>>>>>>>> >      >      >      >             they would be violating
>>>>>>>>>>>>>>> the Ethernet spec.
>>>>>>>>>>>>>>> >      >     But the whole
>>>>>>>>>>>>>>> >      >      >      >             point of
>>>>>>>>>>>>>>> >      >      >      >             segregation is not to
>>>>>>>>>>>>>>> care about such
>>>>>>>>>>>>>>> >     issues.
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      >             On the other hand, if yo=
u
>>>>>>>>>>>>>>> tell me that
>>>>>>>>>>>>>>> >     the VMWare
>>>>>>>>>>>>>>> >      >      >      >             implementation has an
>>>>>>>>>>>>>>> >      >      >      >             Ethernet address that is
>>>>>>>>>>>>>>> part of the tenant
>>>>>>>>>>>>>>> >      >     space, well,
>>>>>>>>>>>>>>> >      >      >      >             they made up
>>>>>>>>>>>>>>> >      >      >      >             this particular game.
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      >             Yours,
>>>>>>>>>>>>>>> >      >      >      >             Joel
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >      >             On 7/31/2019 1:44 PM,
>>>>>>>>>>>>>>> Santosh P K wrote:
>>>>>>>>>>>>>>> >      >      >      >              > I have checked with
>>>>>>>>>>>>>>> implementation
>>>>>>>>>>>>>>> >     in data
>>>>>>>>>>>>>>> >      >     path.
>>>>>>>>>>>>>>> >      >      >     When we
>>>>>>>>>>>>>>> >      >      >      >             receive a
>>>>>>>>>>>>>>> >      >      >      >              > packet with valid VNI
>>>>>>>>>>>>>>> then lookup
>>>>>>>>>>>>>>> >     for MAC will
>>>>>>>>>>>>>>> >      >      >     happen and
>>>>>>>>>>>>>>> >      >      >      >             it is VTEP own
>>>>>>>>>>>>>>> >      >      >      >              > MAC then it will be
>>>>>>>>>>>>>>> trapped to control
>>>>>>>>>>>>>>> >      >     plane for
>>>>>>>>>>>>>>> >      >      >      >             processing. I think we
>>>>>>>>>>>>>>> >      >      >      >              > can have following
>>>>>>>>>>>>>>> options
>>>>>>>>>>>>>>> >      >      >      >              > 1. Optional managment
>>>>>>>>>>>>>>> VNI
>>>>>>>>>>>>>>> >      >      >      >              > 2. Mandatory inner MA=
C
>>>>>>>>>>>>>>> set to VTEP mac
>>>>>>>>>>>>>>> >      >      >      >              > 3. Inner IP TTL set t=
o
>>>>>>>>>>>>>>> 1 to avoid
>>>>>>>>>>>>>>> >      >     forwarding of packet
>>>>>>>>>>>>>>> >      >      >      >             via inner IP
>>>>>>>>>>>>>>> >      >      >      >              > address.
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              > Thoughts?
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              > Thansk
>>>>>>>>>>>>>>> >      >      >      >              > Santosh P K
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              > On Wed, Jul 31, 2019
>>>>>>>>>>>>>>> at 9:20 AM Greg
>>>>>>>>>>>>>>> >     Mirsky
>>>>>>>>>>>>>>> >      >      >      >             >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> gregimirsky@gmail.com>>
>>>>>>>>>>>>>>> >     >>>>>>>>>>>>>> gregimirsky@gmail.com>
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> gregimirsky@gmail.com>>>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >      >>>>>>>>>>>>>> gregimirsky@gmail.com
>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> gregimirsky@gmail.com>
>>>>>>>>>>>>>>> >     >>>>>>>>>>>>>> gregimirsky@gmail.com>>>>
>>>>>>>>>>>>>>> >      >      >      >              > >>>>>>>>>>>>>> gregimirsky@gmail.com
>>>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> gregimirsky@gmail.com>>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >      >>>>>>>>>>>>>> gregimirsky@gmail.com
>>>>>>>>>>>>>>> >     >>
>>>>>>>>>>>>>>> >      >      >      >             >>>>>>>>>>>>>> gregimirsky@gmail.com
>>>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> gregimirsky@gmail.com>>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> >     >>>>> wrote:
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >     Hi Dinesh,
>>>>>>>>>>>>>>> >      >      >      >              >     thank you for you=
r
>>>>>>>>>>>>>>> consideration
>>>>>>>>>>>>>>> >     of the
>>>>>>>>>>>>>>> >      >      >     proposal and
>>>>>>>>>>>>>>> >      >      >      >             questions. What
>>>>>>>>>>>>>>> >      >      >      >              >     would you see as
>>>>>>>>>>>>>>> the scope of
>>>>>>>>>>>>>>> >     testing the
>>>>>>>>>>>>>>> >      >      >      >             connectivity for the
>>>>>>>>>>>>>>> >      >      >      >              >     specific VNI? If
>>>>>>>>>>>>>>> it is
>>>>>>>>>>>>>>> >      >     tenant-to-tenant, then
>>>>>>>>>>>>>>> >      >      >     VTEPs
>>>>>>>>>>>>>>> >      >      >      >             will treat these
>>>>>>>>>>>>>>> >      >      >      >              >     packets as regula=
r
>>>>>>>>>>>>>>> user frames. More
>>>>>>>>>>>>>>> >      >     likely, these
>>>>>>>>>>>>>>> >      >      >      >             could be Layer 2
>>>>>>>>>>>>>>> >      >      >      >              >     OAM, e.g. CCM
>>>>>>>>>>>>>>> frames. The reason
>>>>>>>>>>>>>>> >     to use
>>>>>>>>>>>>>>> >      >     127/8 for
>>>>>>>>>>>>>>> >      >      >      >             IPv4, and
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>>  0:0:0:0:0:FFFF:7F00:0/104 for
>>>>>>>>>>>>>>> >     IPv6 is
>>>>>>>>>>>>>>> >      >     to safeguard
>>>>>>>>>>>>>>> >      >      >      >             from leaking
>>>>>>>>>>>>>>> >      >      >      >              >     Ethernet frames
>>>>>>>>>>>>>>> with BFD Control
>>>>>>>>>>>>>>> >     packet
>>>>>>>>>>>>>>> >      >     to a
>>>>>>>>>>>>>>> >      >      >     tenant.
>>>>>>>>>>>>>>> >      >      >      >              >     You've suggested
>>>>>>>>>>>>>>> using a MAC
>>>>>>>>>>>>>>> >     address to
>>>>>>>>>>>>>>> >      >     trap the
>>>>>>>>>>>>>>> >      >      >      >             control packet at
>>>>>>>>>>>>>>> >      >      >      >              >     VTEP. What that
>>>>>>>>>>>>>>> address could be? We
>>>>>>>>>>>>>>> >      >     had proposed
>>>>>>>>>>>>>>> >      >      >      >             using the
>>>>>>>>>>>>>>> >      >      >      >              >     dedicated MAC and
>>>>>>>>>>>>>>> VTEP's MAC and
>>>>>>>>>>>>>>> >     both
>>>>>>>>>>>>>>> >      >     raised
>>>>>>>>>>>>>>> >      >      >     concerns
>>>>>>>>>>>>>>> >      >      >      >             among VXLAN
>>>>>>>>>>>>>>> >      >      >      >              >     experts. The idea
>>>>>>>>>>>>>>> of using
>>>>>>>>>>>>>>> >     Management
>>>>>>>>>>>>>>> >      >     VNI may
>>>>>>>>>>>>>>> >      >      >     be more
>>>>>>>>>>>>>>> >      >      >      >             acceptable
>>>>>>>>>>>>>>> >      >      >      >              >     based on its
>>>>>>>>>>>>>>> similarity to the
>>>>>>>>>>>>>>> >     practice
>>>>>>>>>>>>>>> >      >     of using
>>>>>>>>>>>>>>> >      >      >      >             Management VLAN.
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >     Regards,
>>>>>>>>>>>>>>> >      >      >      >              >     Greg
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >     On Wed, Jul 31,
>>>>>>>>>>>>>>> 2019 at 12:03 PM
>>>>>>>>>>>>>>> >     Dinesh
>>>>>>>>>>>>>>> >      >     Dutt
>>>>>>>>>>>>>>> >      >      >      >             >>>>>>>>>>>>>> >      >>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> didutt@gmail.com>
>>>>>>>>>>>>>>> >     >>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> didutt@gmail.com>
>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> didutt@gmail.com>
>>>>>>>>>>>>>>> >     >>>
>>>>>>>>>>>>>>> >      >      >      >              >     >>>>>>>>>>>>>> didutt@gmail.com
>>>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> didutt@gmail.com>>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> didutt@gmail.com>
>>>>>>>>>>>>>>> >     >>
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> didutt@gmail.com>
>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> didutt@gmail.com>
>>>>>>>>>>>>>>> >     >>>>>>>>>>>>>> >>>>>>
>>>>>>>>>>>>>>> >      >      >      >             wrote:
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >         Hi Greg,
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >         As long as th=
e
>>>>>>>>>>>>>>> inner MAC
>>>>>>>>>>>>>>> >     address is
>>>>>>>>>>>>>>> >      >     such
>>>>>>>>>>>>>>> >      >      >     that the
>>>>>>>>>>>>>>> >      >      >      >             packet is
>>>>>>>>>>>>>>> >      >      >      >              >         trapped to th=
e
>>>>>>>>>>>>>>> CPU, it should be
>>>>>>>>>>>>>>> >      >     fine for
>>>>>>>>>>>>>>> >      >      >     use as
>>>>>>>>>>>>>>> >      >      >      >             an inner MAC is
>>>>>>>>>>>>>>> >      >      >      >              >         it not?
>>>>>>>>>>>>>>> Stating that is
>>>>>>>>>>>>>>> >     better than
>>>>>>>>>>>>>>> >      >     trying to
>>>>>>>>>>>>>>> >      >      >      >             force a management
>>>>>>>>>>>>>>> >      >      >      >              >         VNI. What if
>>>>>>>>>>>>>>> someone wants
>>>>>>>>>>>>>>> >     to test
>>>>>>>>>>>>>>> >      >      >     connectivity
>>>>>>>>>>>>>>> >      >      >      >             on a specific
>>>>>>>>>>>>>>> >      >      >      >              >         VNI? I would
>>>>>>>>>>>>>>> not pick a
>>>>>>>>>>>>>>> >     loopback IP
>>>>>>>>>>>>>>> >      >      >     address for
>>>>>>>>>>>>>>> >      >      >      >             this since that
>>>>>>>>>>>>>>> >      >      >      >              >         address range
>>>>>>>>>>>>>>> is host/node local
>>>>>>>>>>>>>>> >      >     only. Is
>>>>>>>>>>>>>>> >      >      >     there a
>>>>>>>>>>>>>>> >      >      >      >             reason you're
>>>>>>>>>>>>>>> >      >      >      >              >         not using the
>>>>>>>>>>>>>>> VTEP IP as the
>>>>>>>>>>>>>>> >     inner IP
>>>>>>>>>>>>>>> >      >      >     address ?
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >         Dinesh
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >         On Wed, Jul
>>>>>>>>>>>>>>> 31, 2019 at 5:48 AM
>>>>>>>>>>>>>>> >      >     Greg Mirsky
>>>>>>>>>>>>>>> >      >      >      >              >         <
>>>>>>>>>>>>>>> gregimirsky@gmail.com
>>>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> gregimirsky@gmail.com>>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >      >>>>>>>>>>>>>> gregimirsky@gmail.com
>>>>>>>>>>>>>>> >     >>
>>>>>>>>>>>>>>> >      >      >      >             >>>>>>>>>>>>>> gregimirsky@gmail.com
>>>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> gregimirsky@gmail.com>>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> >     >>> >>>>>>>>>>>>>> gregimirsky@gmail.com
>>>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> gregimirsky@gmail.com>>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >      >>>>>>>>>>>>>> gregimirsky@gmail.com
>>>>>>>>>>>>>>> >     >>
>>>>>>>>>>>>>>> >      >      >      >             >>>>>>>>>>>>>> gregimirsky@gmail.com
>>>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> gregimirsky@gmail.com>>
>>>>>>>>>>>>>>> >      >      >     >>>>>>>>>>>>>> >     
>>>>>>>>>>>>>>> >      >     >>>>>>>>>>>>>> >     >>>>> wrote:
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >             Dear All,
>>>>>>>>>>>>>>> >      >      >      >              >             thank you
>>>>>>>>>>>>>>> for your comments,
>>>>>>>>>>>>>>> >      >      >     suggestions on
>>>>>>>>>>>>>>> >      >      >      >             this issue,
>>>>>>>>>>>>>>> >      >      >      >              >             probably
>>>>>>>>>>>>>>> the most
>>>>>>>>>>>>>>> >     challenging
>>>>>>>>>>>>>>> >      >     for this
>>>>>>>>>>>>>>> >      >      >      >             specification. In the
>>>>>>>>>>>>>>> >      >      >      >              >             course of
>>>>>>>>>>>>>>> our discussions,
>>>>>>>>>>>>>>> >      >     we've agreed to
>>>>>>>>>>>>>>> >      >      >      >             abandon the
>>>>>>>>>>>>>>> >      >      >      >              >             request t=
o
>>>>>>>>>>>>>>> allocate the
>>>>>>>>>>>>>>> >      >     dedicated MAC
>>>>>>>>>>>>>>> >      >      >     address
>>>>>>>>>>>>>>> >      >      >      >             to be used as
>>>>>>>>>>>>>>> >      >      >      >              >             the
>>>>>>>>>>>>>>> destination MAC
>>>>>>>>>>>>>>> >     address in
>>>>>>>>>>>>>>> >      >     the inner
>>>>>>>>>>>>>>> >      >      >      >             Ethernet frame.
>>>>>>>>>>>>>>> >      >      >      >              >             Also,
>>>>>>>>>>>>>>> earlier using VNI
>>>>>>>>>>>>>>> >     0 was
>>>>>>>>>>>>>>> >      >     changed from
>>>>>>>>>>>>>>> >      >      >      >             mandatory to one
>>>>>>>>>>>>>>> >      >      >      >              >             of the
>>>>>>>>>>>>>>> options an
>>>>>>>>>>>>>>> >      >     implementation may
>>>>>>>>>>>>>>> >      >      >     offer to
>>>>>>>>>>>>>>> >      >      >      >             an operator.
>>>>>>>>>>>>>>> >      >      >      >              >             The most
>>>>>>>>>>>>>>> recent
>>>>>>>>>>>>>>> >     discussion was
>>>>>>>>>>>>>>> >      >     whether
>>>>>>>>>>>>>>> >      >      >     VTEP's
>>>>>>>>>>>>>>> >      >      >      >             MAC address
>>>>>>>>>>>>>>> >      >      >      >              >             might be
>>>>>>>>>>>>>>> used as the
>>>>>>>>>>>>>>> >      >     destination MAC
>>>>>>>>>>>>>>> >      >      >     address
>>>>>>>>>>>>>>> >      >      >      >             in the inner
>>>>>>>>>>>>>>> >      >      >      >              >             Ethernet
>>>>>>>>>>>>>>> frame. As I
>>>>>>>>>>>>>>> >     recall it, the
>>>>>>>>>>>>>>> >      >      >     comments
>>>>>>>>>>>>>>> >      >      >      >             from VXLAN
>>>>>>>>>>>>>>> >      >      >      >              >             experts
>>>>>>>>>>>>>>> equally split
>>>>>>>>>>>>>>> >     with one
>>>>>>>>>>>>>>> >      >     for it
>>>>>>>>>>>>>>> >      >      >     and one
>>>>>>>>>>>>>>> >      >      >      >             against. Hence
>>>>>>>>>>>>>>> >      >      >      >              >             I would
>>>>>>>>>>>>>>> like to propose
>>>>>>>>>>>>>>> >     a new
>>>>>>>>>>>>>>> >      >     text to
>>>>>>>>>>>>>>> >      >      >     resolve
>>>>>>>>>>>>>>> >      >      >      >             the issue. The
>>>>>>>>>>>>>>> >      >      >      >              >             idea is t=
o
>>>>>>>>>>>>>>> let an
>>>>>>>>>>>>>>> >     operator select
>>>>>>>>>>>>>>> >      >      >     Management
>>>>>>>>>>>>>>> >      >      >      >             VNI and use
>>>>>>>>>>>>>>> >      >      >      >              >             that VNI
>>>>>>>>>>>>>>> in VXLAN
>>>>>>>>>>>>>>> >     encapsulation
>>>>>>>>>>>>>>> >      >     of BFD
>>>>>>>>>>>>>>> >      >      >      >             Control packets:
>>>>>>>>>>>>>>> >      >      >      >              >             NEW TEXT:
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >                 An
>>>>>>>>>>>>>>> operator MUST
>>>>>>>>>>>>>>> >     select a VNI
>>>>>>>>>>>>>>> >      >      >     number to
>>>>>>>>>>>>>>> >      >      >      >             be used as
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>>  Management VNI. VXLAN
>>>>>>>>>>>>>>> >      >     packet for
>>>>>>>>>>>>>>> >      >      >      >             Management VNI MUST NOT
>>>>>>>>>>>>>>> >      >      >      >              >                 be
>>>>>>>>>>>>>>> sent to a tenant. VNI
>>>>>>>>>>>>>>> >      >     number 1 is
>>>>>>>>>>>>>>> >      >      >      >             RECOMMENDED as the
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>>  default for
>>>>>>>>>>>>>>> >     Management VNI.
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >             With that
>>>>>>>>>>>>>>> new text, what
>>>>>>>>>>>>>>> >     can be the
>>>>>>>>>>>>>>> >      >      >     value of
>>>>>>>>>>>>>>> >      >      >      >             the destination
>>>>>>>>>>>>>>> >      >      >      >              >             MAC in th=
e
>>>>>>>>>>>>>>> inner Ethernet? I
>>>>>>>>>>>>>>> >      >     tend to
>>>>>>>>>>>>>>> >      >      >     believe
>>>>>>>>>>>>>>> >      >      >      >             that it can be
>>>>>>>>>>>>>>> >      >      >      >              >             anything
>>>>>>>>>>>>>>> and ignored by the
>>>>>>>>>>>>>>> >      >     reciever VTEP.
>>>>>>>>>>>>>>> >      >      >      >             Also, if the
>>>>>>>>>>>>>>> >      >      >      >              >             trapping
>>>>>>>>>>>>>>> is based on VNI
>>>>>>>>>>>>>>> >      >     number, the
>>>>>>>>>>>>>>> >      >      >      >             destination IP address
>>>>>>>>>>>>>>> >      >      >      >              >             of the
>>>>>>>>>>>>>>> inner IP packet
>>>>>>>>>>>>>>> >     can from
>>>>>>>>>>>>>>> >      >     the range
>>>>>>>>>>>>>>> >      >      >      >             127/8 for IPv4,
>>>>>>>>>>>>>>> >      >      >      >              >             and for
>>>>>>>>>>>>>>> IPv6 from the range
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>>  0:0:0:0:0:FFFF:7F00:0/104. And
>>>>>>>>>>>>>>> >      >      >      >              >             lastly,
>>>>>>>>>>>>>>> the TTL to be
>>>>>>>>>>>>>>> >     set to 1 (no
>>>>>>>>>>>>>>> >      >      >     change here).
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >             Much
>>>>>>>>>>>>>>> appreciate your
>>>>>>>>>>>>>>> >     comments,
>>>>>>>>>>>>>>> >      >      >     questions, and
>>>>>>>>>>>>>>> >      >      >      >             suggestions.
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >              >             Best
>>>>>>>>>>>>>>> regards,
>>>>>>>>>>>>>>> >      >      >      >              >             Greg
>>>>>>>>>>>>>>> >      >      >      >              >
>>>>>>>>>>>>>>> >      >      >      >
>>>>>>>>>>>>>>> >      >      >
>>>>>>>>>>>>>>> >      >
>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>

--000000000000c8d80e0594024914
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Xiao,
=C2=A0 =C2=A0Thanks for your explanation. This h=
elps a lot. I would wait for more comments from others to see if this what =
we need in this draft to be supported based on that we can provide appropri=
ate sections in the draft.=C2=A0

Thanks
=
Santosh P K=C2=A0

On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:
Hi Santosh,

With regard to =
the question whether we should=C2=A0=
allow multiple BFD sessions for the same VNI or not, IMHO we should allow i=
t, more explanation as follows.
Below is a figure deriv=
ed from figure 2 of RFC8014 (A=
n Architecture for Data-Center Network Virtualization over Layer 3 (NVO3)).
                    |         D=
ata Center Network (IP)        |
                    |                                         |
                    +-----------------------------------------+
                         |                           |
                         |       Tunnel Overlay      |
            +------------+---------+       +---------+------------+
            | +----------+-------+ |       | +-------+----------+ |
            | |  Overlay Module  | |       | |  Overlay Module  | |
            | +---------+--------+ |       | +---------+--------+ |
            |           |          |       |           |          |
     NVE1   |           |          |       |           |          | NVE2
            |  +--------+-------+  |       |  +--------+-------+  |
            |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
            |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
            |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
            +----+-----+----+------+       +----+-----+-----+-----+
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
          -------+-----+----+-------------------+-----+-----+-------
                 |     |    |     Tenant        |     |     |
            TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
                +---+ +---+ +---+             +---+ +---+   +---+
                |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
                +---+ +---+ +---+             +---+ +---+   +---+
To my understanding, the BFD sess=
ions between NVE1 and NVE2 are actually initiated and terminated at VAP of =
NVE.
If the network operator want to set up one BFD ses=
sion between VAP1 of NVE1 and VAP1of NVE2, at the same time another BFD ses=
sion between VAP3 of NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same VNI1,=C2=
=A0I believe it's reasonable, so that's why I think we shoul=
d allow it.

Of course, in RFC8014 it also says:=

"Note that two different Tenant Systems (and TSIs) attached t=
o a common NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as t=
hey connect to the same Virtual Network.&=
quot;
Some people may argue that all Tenant Systems c=
onnecting to the same Virtual Network MUST share one VAP, if that's tru=
e, then VAP1 and VAP3 should merge into one VAP and my explanation doesn=
9;t work. Copying to NVO3 WG to involve more experts, hope for your clarifi=
cations and comments.

Best Reg=
ards,
Xiao Min
=E5=8E=9F=E5=A7=
=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9ASanto=
shPK <=
santosh.pallagatti@gmail.com>
=E6=94=B6=E4=
=BB=B6=E4=BA=BA=EF=BC=9AGreg Mirsky=
 <gregimirsky=
@gmail.com>;
=E6=97=A5 =E6=
=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=9C=8823=E6=97=A5 05:39
=E4=B8=BB =E9=A2=98 =EF=BC=9A=
Re: BFD over VXLAN: Trapping BFD Control packet at VTEP
Greg,
=C2=
=A0 =C2=A0 Please see inline reply tagged [SPK]. I have added text requeste=
d.

Thanks
Santosh P K=C2=A0

On Fri, Aug 16, 2019 at =
4:59 AM Greg Mirsky <gregimirsky@gmail...com> wrote:
Hi Santo=
sh,
thank you for your comments. Please find my notes in-lined and tagg=
ed GIM>>.

Regards,
Greg

On Tue, Aug 13, =
2019 at 10:24 PM Santosh P K <santosh.pallagatti@gmail.com> wrote:
Greg,<=
div>=C2=A0 =C2=A0Thanks for updated version of document. Here are few comme=
nts on new draft.

Section 4:
Destination MAC: This MUST NOT be=
 of one of tenant's MAC
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 addr=
esses.=C2=A0 The MAC address MAY be configured, or it MAY be
=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 learned via a control plane protocol.=C2=A0 =
The details of how the
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 MAC addre=
ss is obtained are outside the scope of this document.

I think we may n=
eed to give background on why we are saying MAC address MUST not be one of =
tenant's MAC address. Like in this thread we have discussed one of the =
tenant could have borrowed the same VTEP mac address and we if we have to u=
se BFD then we need to avoid that conflict to ensure BFD packets get observ=
ed in the VTEP itself. Should we add a section before 4 to set that context=
 so that above text makes more sense in that context?
GIM>> Certainly. Please share the text you'd like to add.=
=C2=A0
=C2=A0
[SPK]=C2=A0 Proposed text f=
or why we should not use VTEP MAX address as tenant MAC address.

<=
div>"In some scenarios tenant MAC is borrowed from VTEP MAC address. V=
XLAN BFD MUST terminate BFD session at VTEP and MUST not forward BFD packet=
s to tenants. To terminate VXLAN BFD packets at VTEP, deployment MUST ensur=
e that there are no tenant VM which barrows VTEP MAC address."


=C2=A0=C2=A0=C2=A0IP header:
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 Destination IP: IP address MUST NOT be of one of tenant's IP
=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 addresses.=C2=A0 IP address MAY be =
selected from the range 127/8 for
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.

=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 TTL: MUST be set to 1 to ensure that t=
he BFD packet is not
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 routed with=
in the L3 underlay network.


I think we have added some text to addres=
s Sridhar comments on why TTL MUST be 1 and dest IP address MUST be 127/8 r=
ange. I see that text is missing now.
GIM>&=
gt; My apologies that I've missed to include the text from another disc=
ussion thread. I believe the following would be complete:
=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 TTL or Hop Limit: MUST be set to 1 to ensure th=
at the BFD
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0packet is not routed with=
in the Layer 3 underlay network.=C2=A0 This
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0addresses the scenario when the inner IP destination address is
=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0of VXLAN gateway and there is a router in=
 underlay which
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0removes the VXLAN head=
er, then it is possible to route the
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0p=
acket as VXLAN =C2=A0gateway address is routable address.
=C2=A0
[SPK] This text looks good.=C2=A0=C2=A0
<=
br>
Section =
5.1:
<=
div>For such packets, the BFD session MUST be identified
=C2=A0=
=C2=A0 using the following three-tuples of fields of the inner header: the<=
/div>
=C2=A0=C2=A0 source IP, the destination IP, and the source UDP po=
rt number present
=C2=A0=C2=A0 in the IP header carried by the pa=
yload of the packet in VXLAN
=C2=A0=C2=A0 encapsulation.=C2=A0 If=
 BFD packet is received with non-zero Your
Discriminator, then BF=
D session MUST be demultiplexed only with Your
=C2=A0=C2=A0 Discr=
iminator as the key.

Just with 3 tuple we will not be able to demux pac=
ket. We need to consider VNI as well if we have multiple BFD session betwee=
n same pair of VTEP.
GIM>> This is one o=
f comments from Carlos we need to address. Your comment have helped me to f=
orm the question:
What is the goal ru=
nning multiple BFD sessions between the pair of VTEPs?
=C2=A0
[SPK] The goal of the multiple BFD sessio=
n is to ensure check liveliness of VXLAN tunnel. There is already a good am=
ount of debate on this topic that do we really need that? As per RFC 5884 w=
e are running BFD per LSP and we might hit scale issues there too. I think =
it is up to operator to decide how they want to use multiple BFD session pe=
r VXLAN tunnel. It could be possible that BFD session with special VNI is r=
un at aggressive interval where as MAY have multiple BFD sessions for diffe=
rent VNI at a sedate interval, for that matter they could be running in dem=
and mode as well (run P/F sequence only when there is no data following for=
 that VNI). As WG if we think running multiple BFD session make sense then =
we might need to add appropriate text.

If the goal is to monitor per VNI, =
then the following text should describe the demultiplexing of the initial B=
FD Control packet:
=C2=A0 =C2=A0Demultiplexing of IP BFD packet has bee=
n defined in Section 3 of
=C2=A0 =C2=A0[RFC5881].=C2=A0 Since multiple B=
FD sessions may be running between two
=C2=A0 =C2=A0VTEPs, there needs t=
o be a mechanism for demultiplexing received BFD
=C2=A0 =C2=A0packets to=
 the proper session.=C2=A0 For demultiplexing packets with Your
=C2=A0 =
=C2=A0Discriminator equal to 0, a BFD session MUST be identified using the<=
br>=C2=A0 =C2=A0logical link over which the BFD Control packet is received.=
=C2=A0 In the
=C2=A0 =C2=A0case of VXLAN, the VNI number identifies that=
 logical link.=C2=A0 If BFD
=C2=A0 =C2=A0packet is received with non-zer=
o Your Discriminator, then BFD session
=C2=A0 =C2=A0MUST be demultiplexe=
d only with Your Discriminator as the key.
=C2=A0[SPK]=C2=A0 I think this text for multiple BFD session between same pair=
 of VTEPs for multiple VNI makes sense only if as WG we think that could be=
 use case.=C2=A0

Would there be need to run multiple BFD sessions wit=
h the same VNI number?

[SPK] IMHO we shoul=
d not allow multiple BFD session for the same VNI.=C2=A0
=C2=A0

=



Thanks
Santosh P K


On Fri, Aug 9, 2019 at 4:27 AM Greg Mir=
sky <gregimir=
sky@gmail.com> wrote:
Dinesh, thank you for your help, much appreci=
ated.
Hi Joel and Sridhar,
could you please check if the =
updated text on the inner Ethernet frame addressed your concern.

On We=
d, Aug 7, 2019 at 2:25 PM Dinesh Dutt <didutt@gmail.com> wrote:
Looks god to me =
Greg. Thank you for your hard work in this,

Dinesh
<=
/div>
O=
n Wed, Aug 7, 2019 at 9:25 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dine=
sh, Joel, Sridhar, et al.,
much appreciate the help you've=C2=A0giv=
en me sharing your expertise. I hope that the updates you will find in the =
attached diff and the working copy of the draft be closer to the acceptable=
 solution for VTEP-VTEP BFD. Please note, that I'll shortly start a new=
 discussion thread to address one of Carlos's questions on the ambiguit=
y of the text on multiple concurrent sessions between the same pair of VTEP=
s.
Please review the changes to Sections 4 and 6 and share your f=
eedback, suggestions, and questions.

Regards,
Greg<=
/div>

On Mon, Aug 5, 2019 at 6:03 PM Dinesh Dutt <didutt@gmail.com> wrote:


On Mon, Aug 5=
, 2019 at 5:56 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dinesh,
than=
k you for your expedient detailed response.
I believe that the ab=
ility to run BFD session up to a tenant (VTEP-VTEP-tenant or tenant-tenant)=
 was never in jeopardy from this specification.
I'm trying to=
 provide precise specification on what can be used ad the destination MAC a=
nd IP addresses in the inner frame/packet as I believe that likely will hel=
p to avoid interoperability issues.
I'm interested to learn s=
ome more about the "martian checking" function. As you know, mart=
ian addresses have been used as destination IP address in LSP Ping and BFD =
over MPLS LSP and PW. I haven't heard that any silicon feature caused p=
roblems for operators using these tools.

I=
nteresting. I didn't know this aspect of use with MPLS ping. Did those =
packets ever go through a firewall though? In any case, maybe suggest the u=
se of those addresses with a statement that this is how LSP does it, but th=
at other MAC/IP pairs are possible as long as the conditions of the endpoin=
t owning the MAC/IP was honored.

Dinesh

Regards,
Greg

On Mon, Aug 5, 2019 at 3:59 PM Dinesh Dutt <didutt@gmail.com> wrote:=

Hi Greg,

That we agree on the problem definition is th=
e first step forward. Your original document had my cases covered and so I =
was surprised by the track this thread took. It doesn't matter, we'=
re back on track.

My recommendation is to not worry about spe=
cifying the precise MAC/IP address used in the inner header. The addresses =
chosen MUST ensure that the packet is trapped to the control plane of the V=
TEP and not escape to the tenant if the BFD is to the VTEP. Any solution MU=
ST also not preclude the use of the BFD by tenant systems for that VNI. The=
re are many ways an implementer can choose to implement this. For example, =
the inner MAC address is whatever the VTEP implementer would return if ARP&=
#39;d for the IP address used in the inner header in the given VNI. The imp=
lementer can pick a fixed MAC address, one that they own etc. Multiple BFD =
sessions can be run for testing path connectivity on more than one VNIs. Li=
mits should be in place to avoid overwhelming the receiver with BFD message=
s (you had words about this in your currently published draft).=C2=A0 If th=
e VNI is irrelevant in the test i.e. only the VXLAN pipe at the VTEP is bei=
ng tested. the user can use any VNI active on the VTEP on which the VTEP ow=
ns an IP address.

I'm concerned about the use of 127/8 ad=
dress only because of firewalls or implementations that drop packets with t=
hese addresses as either the source or destination. For example, on many me=
rchant silicon, I don't believe you can turn off martian checking and d=
rops *only* for VXLAN-encapsulated BFD packets. I don't know what the L=
inux kernel does today on such packets, for example (or Hyper-V). I'd l=
ike a solution that doesn't demand additional or new chip functionality=
 or require additional middle-box hole punch.

Why do you feel=
 you MUST to specify the MAC/IP address on the inner packet? What am I miss=
ing here?

Dinesh

On Mon, Aug 5, 2019 at 3:04 PM =
Greg Mirsky <=
gregimirsky@gmail.com> wrote:
Hi Dinesh,
what =
do you see as the way forward? I agree, that the proposed text doesn't =
work for multi-VNI concurrent monitoring because these VNIs are tenant'=
s VNIs. And in that case, we need to specify another mechanism to trap the =
BFD Control packet at VTEP. It seems that VTEP's Ethernet address must =
be used as the destination MAC address in the inner Ethernet frame. The des=
tination IP address may be either VTEP's address of martian (I do prefe=
r martian). Let me give it=C2=A0 try:
NEW TEXT:
To monitor continuity of the path between two VTEPs, an o=
perator MUST select a VNI number to be used as Management VNI. Management V=
NI number MUST NOT be one of the tenant's VNIs to prevent sending VXLAN=
 packets received on Management VNI to a tenant. VNI number 1 is RECOMMENDE=
D as the default for Management VNI. [Ed.note: What we set the Destination =
MAC to? Can it be invalid MAC that MUST be ignored on receipt?]
=

If an implementation supports concurre=
nt monitoring of multiple VNIs, then the value of VNI number MAY be one of =
tenant's VNIs. The destination MAC address in the inner Ethernet frame =
encapsulating BFD Control packet MUST be MAC associated with the remote VTE=
P.=C2=A0
The destination IP address of the inner IP packet MUST b=
e selected from the range 127/8 for IPv4, and for IPv6 from the range 0:0:0=
:0:0:FFFF:7F00:0/104. The TTL value in the inner IP header MUST be set to 1=
.

Regards,
Greg=C2=A0

On Sun, Aug 4, 2019 at 9=
:07 AM Dinesh Dutt <didutt@gmail.com> wrote:
Hi Greg,

Thanks for y=
our clarifications. I agree with your sentiment on why you're running B=
FD over VXLAN between VTEPs. I wasn't arguing against it at all. All I =
was saying was pointing to the limitations of the use of management VNI. I =
spoke to some operators who're running EVPN and mentioned the discussio=
n on this thread. They concur that they're using specific VNIs to test =
connectivity over that VNI between VTEPs to ensure misconfiguration doesn&#=
39;t lead to blackholes. My statements are based in real world operator exp=
erience. And I was providing language that ensured packets didn't leak =
across to tenants when they were destined to VTEPs.

Dinesh

On Sat, Aug 3, 2019 at 10:34 AM Greg Mirsky <gregimirsky@gmail.com> wrote:=

Hi Dinesh,
many thanks for your detailed updates on how some implemen=
tations process VXLAN header and the inner Ethernet frame. These are very h=
elpful in achieving the workable solution for the problem at hand.
You've noted that a path between VTEPs may be monitored in the underl=
ay network by merely establishing a BFD session. That is true, but by using=
 BFD with VXLAN encapsulation between the pair of VTEPs we are extending th=
e OAM domain by including, to some extent, VXLAN forwarding engine. Abstrac=
t in RFC 5880 defines the goal and the domain in which BFD protocol can det=
ect a fault as:
=C2=A0 =C2=A0This document describes a protocol i=
ntended to detect faults in the
=C2=A0 =C2=A0bidirectional path between =
two forwarding engines, including
=C2=A0 =C2=A0interfaces, data link(s),=
 and to the extent possible the forwarding
=C2=A0 =C2=A0engines themselv=
es, with potentially very low latency.=C2=A0
Thus, BFD in the=
 underlay will exercise a part of IP forwarding engine while BFD with VXLAN=
 encapsulation, ran between the same pair of VTEPs, extends the OAM domain.=
 At the same time, defining BFD between tenant systems in outside the goal =
of this specification. But VXLAN BFD session between VTEPs may be useful in=
 monitoring e2e path between tenants, as described in the update to -07:
=C2=A0 =C2=A0At the same time, a service layer BFD session may be u=
sed between the
=C2=A0 =C2=A0tenants of VTEPs IP1 and IP2 to provide end=
-to-end fault management.
=C2=A0 =C2=A0In such case, for VTEPs BFD contr=
ol packets of that session are
=C2=A0 =C2=A0indistinguishable from data =
packets.=C2=A0 If end-to-end defect detection
=C2=A0 =C2=A0is realized a=
s the set of concatenated OAM domains, e.g., VM1-1 - IP1
=C2=A0 =C2=A0--=
 IP2 - VM2-1, then the BFD session over VXLAN between VTEPs SHOULD
=C2=
=A0 =C2=A0follow the procedures described in Section 6.8.17 [RFC5880].
<=
/div>
I've attached the current working version of the draft.
=

Regards,
Greg


On Fri, Aug 2, 2019 at 5:43 PM Di=
nesh Dutt <didutt@=
gmail.com> wrote:
What I mean is "How do you infer that=
 it excludes the case I'm talking about?". 

Dine=
sh

On Fri, Aug 2, 2019 at 5:41 PM Dinesh Dutt <didutt@gmail.com> wrote:
The =
abstract reads this: "
This document describes the use of the =
Bidirectional Forwarding
   Detection (BFD) protocol in point-to-point Virtual eXtensible Local
   Area Network (VXLAN) tunnels forming up an overlay network."
How do you infer w=
hat you said?

Dinesh

On Fri, Aug 2, 2019 at 5:38 PM Joel M. Halp=
ern <jmh@joelha=
lpern.com> wrote:
I am going by what the draft says its purpose is.=C2=A0 If you (=
Dinesh) want 
the draft to fulfill a different purpose, then either ask =
the chairs to 
take this draft back to the WG, or write a separate draft=
.
As currently written, the behavior Greg proposed meets the needs, and =

does so in a way that is consistent with VxLAN.

Yours,
Joel
On 8/2/2019 8:30 PM, Dinesh Dutt wrote:
> What is the stated pu=
rpose of this BFD session? The VTEP reachability is 
> determined by =
the underlay, I don't need VXLAN-encaped packet for that. 
> Do w=
e agree?
> 
> If I want to test the VXLAN encap/decap functiona=
lity alone, picking any 
> single VNI maybe fine. But is this all any=
 network operator wants? Why? 
> In what situations has this been a p=
roblem? I suspect operators also 
> want to verify path continuity ov=
er a specific VNI. If you say this is 
> not defined by the document,=
 I disagree because the current version 
> talks about controlling th=
e number of BFD sessions between the VTEPs 
> (see section 3). More i=
mportantly, this is a real problem that operators 
> like to verify.<=
br>> 
> Dinesh
> 
> On Fri, Aug 2, 2019 at 5:08 PM Joe=
l M. Halpern <j=
mh@joelhalpern.com 
> <mailto:jmh@joelhalpern.com>> wrote:
> >=C2=A0 =C2=A0 =C2=A0What is special about the management VNI is precis=
ely that it is NOT a
>=C2=A0 =C2=A0 =C2=A0tenant VNI.=C2=A0 The VxLAN=
 administration does know how it allocates VNI to
>=C2=A0 =C2=A0 =C2=
=A0tenants, and which VNI it has allocated.=C2=A0 In contrast, it does not =
know
>=C2=A0 =C2=A0 =C2=A0which IP addresses or MAC adddresses teh te=
nant is using or may plan
>=C2=A0 =C2=A0 =C2=A0to use.
> 
&g=
t;=C2=A0 =C2=A0 =C2=A0Yours,
>=C2=A0 =C2=A0 =C2=A0Joel
> 
&g=
t;=C2=A0 =C2=A0 =C2=A0On 8/2/2019 6:41 PM, Dinesh Dutt wrote:
>=C2=A0=
 =C2=A0 =C2=A0 > The assumption of an IP address within any VNI is suspe=
ct that way.
>=C2=A0 =C2=A0 =C2=A0 > What's special about a si=
ngle VNI, the management VNI? The VTEP IP
>=C2=A0 =C2=A0 =C2=A0 > =
address does not belong in reality in any VNI...
>=C2=A0 =C2=A0 =C2=
=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Dinesh
>=C2=A0 =C2=A0 =C2=
=A0 >
>=C2=A0 =C2=A0 =C2=A0 > On Fri, Aug 2, 2019 at 3:17 PM Jo=
el M. Halpern
>=C2=A0 =C2=A0 =C2=A0<jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
=
>=C2=A0 =C2=A0 =C2=A0 > <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>=
 wrote:
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0Your response seems to miss two points:
>=C2=A0 =
=C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Firs=
t, the problem you describe is not what the document says
>=C2=A0 =C2=
=A0 =C2=A0it is
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0solving=
.=C2=A0 To the degree it discusses it at all, the document
>=C2=A0 =
=C2=A0 =C2=A0says "
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 =C2=A0In
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0most cases=
, a single BFD session is sufficient for the given
>=C2=A0 =C2=A0 =C2=
=A0VTEP to
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0monitor the =
reachability of a remote VTEP, regardless of the
>=C2=A0 =C2=A0 =C2=
=A0number of
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0VNIs in co=
mmon. "
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0Second, you assume the existence of an IP address fo=
r a VTEP
>=C2=A0 =C2=A0 =C2=A0within a
>=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0VNI.=C2=A0 As with the MAC address, the VTEP does not=
 have an IP
>=C2=A0 =C2=A0 =C2=A0address
>=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0within the VNI.=C2=A0 Some implementations may have=
 created such a
>=C2=A0 =C2=A0 =C2=A0thing,
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0but
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0the general construct, as defined to date, does not support such.=

>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0In short, you are requiring a behavior that violates the
&g=
t;=C2=A0 =C2=A0 =C2=A0architectural
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0structure of overlay / underlay separation, and common
>=
=C2=A0 =C2=A0 =C2=A0usage.=C2=A0 And you
>=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0are doing so to support a use case that the working gro=
up has not
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0indicated in=
 the document as important.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Yours,
>=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0Joel
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0On 8/2/2019 5:01 PM, Dinesh Dutt wrot=
e:
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Joel,
>=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 > You understood correctly.
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 > The VNIs may not share fate due to misconfigurat=
ion. And I
>=C2=A0 =C2=A0 =C2=A0strongly
>=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 > suspect someone will want to use BFD for that=
 because its
>=C2=A0 =C2=A0 =C2=A0about
>=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0checking
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 > path continuity as stated by the draft. As long as there=
9;s a
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0valid IP
>=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > (because it's BFD) o=
wned by the VTEP in that VNI, you can
>=C2=A0 =C2=A0 =C2=A0use BFD in=

>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > that VNI. Thats =
all that you need to dictate.=C2=A0 That IP address
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0has a MAC
>=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 > address and you can use that on the inner frame. =
That is
>=C2=A0 =C2=A0 =C2=A0all normal
>=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 > VXLAN processing. The outer IP is always that =
of the VTEP.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
&=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Dinesh
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 > On Fri, Aug 2, 2019 at 11:03 AM Joel M. Halpern<=
br>>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<jmh@joelhalpern.com <mailto:jmh@joelhalpern.com<=
/a>>
>=C2=A0 =C2=A0 =C2=A0<mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>=
;
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > <mailto:jmh@joelhalpern.com <mailto:jmh@j=
oelhalpern.com>
>=C2=A0 =C2=A0 =C2=A0<mailto:jmh@joelhalpern.com <mail=
to:jmh@joelhalpern=
.com>>>> wrote:
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0If I am reading your various emails correctly Dinesh>=C2=A0 =C2=A0 =C2=A0(and I
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0may have
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0missed something) you are trying to use the MAC addres=
s
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0because you
>=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0want<=
br>>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0to be able to send these BFD packets over arbitrary VNI to
>=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0monitor the
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0VNI.=C2=A0 That is not=
 a requirement identified in the
>=C2=A0 =C2=A0 =C2=A0document.
&g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0It is not
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0even a problem =
I understand, since all the VNI between an
>=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0ingress and
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0egress VTEP share fate.
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Yours,
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Joel
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0On 8/2/2019 1:44 PM, Dinesh D=
utt wrote:
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 > Thanks for verifying this. On Linux and hardware
>=
=C2=A0 =C2=A0 =C2=A0routers
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0that I'm
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0aware
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 > of (Cisco circa 2012 and Cumulus), the=
 physical MAC
>=C2=A0 =C2=A0 =C2=A0address is
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0reused
>=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > ac=
ross the VNIs on the VTEP. Did you check on a non-VMW
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0device?
>=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0This is
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > more for my own =
curiosity.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 > To address the general case, can we not define a=

>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0well-known (or
>=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0reser=
ve
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 > one) unicast MAC address for use with VTEP? If the MAC
>=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0address is
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > configura=
ble in BFD command, this can be moot.
>=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Dinesh
>=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 > On Fri, Aug 2, 2019 at 10:27 AM Santosh P K
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > <santosh.pallagatti@gm=
ail.com
>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com&g=
t;
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagat=
ti@gmail...com
>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.co=
m>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com
>=C2=A0 =C2=A0 =
=C2=A0<mailto:santosh.pallagatti@gmail.com>
>=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail...com
>=C2=A0 =
=C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com>>>
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:<=
a href=3D"mailto:santosh.pallagatti@gmail.com" target=3D"_blank">santosh.pa=
llagatti@gmail.com
>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmai=
l.com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailt=
o:santosh=
.pallagatti@gmail...com
>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagat=
ti@gmail.com>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com
>=C2=
=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com>
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail...com
=
>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com>>>>&=
gt; wrote:
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0I have cross checked point ra=
ised about MAC address
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
usage. It is
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0possible that tenant could be usi=
ng physical MAC
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0address=
 and
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0when a
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0packet comes with valid VNI with =
a MAC address
>=C2=A0 =C2=A0 =C2=A0that is
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0being
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0used by
>=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0te=
nant then packet will be sent to that tenant.
>=C2=A0 =C2=A0 =C2=A0Th=
is rules
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0out the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0fact that we could use phys=
ical MAC address as
>=C2=A0 =C2=A0 =C2=A0inner
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0MAC to
>=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0ensure
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0packets get terminated at VTEP itself.
>=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0Thanks
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Santosh P K
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0On Wed, Jul 31, 2019 at 11:00 AM Santosh P K
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0<santosh.pallagatti@gmail.com
>=C2=A0 =C2=A0 =C2=A0<mailto=
:santosh.=
pallagatti@gmail.com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0<mailto:santosh.pallagatti@gmail...com
>=C2=A0 =C2=A0 =C2=A0<m=
ailto:san=
tosh.pallagatti@gmail.com>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com
>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com>
>=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail...c=
om
>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com>>=
;>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com
>=C2=A0 =C2=A0 =C2=A0<=
;mailto:s=
antosh.pallagatti@gmail.com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail...com
>=C2=A0 =C2=A0 =C2=
=A0<mailto:santosh.pallagatti@gmail.com>>
>=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.=
com
>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com>>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gma=
il...com
>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com&=
gt;>>>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0wrote:
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0Joel,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0Thanks for your inputs. I checked
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0implementation within
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0Vmware. Perhaps I should have been more clear
>=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0about MAC
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0address
>=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0space while checking internally. I will cros=
s
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0check again for
&g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the same and get back on this list.
=
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0Santosh P K
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0On Wed, Jul 31, 2019 at 10:54 AM Joel M.
>=C2=A0 =C2=A0 =C2=
=A0Halpern
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<jmh@joelhalpern.com
>=C2=
=A0 =C2=A0 =C2=A0<mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com
>=C2=A0 =C2=
=A0 =C2=A0<mailto:jmh@joelhalpern.com>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0<mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
>=C2=A0 =C2=A0 =C2=
=A0<mailto:jmh@=
joelhalpern.com <mailto:jmh@joelhalpern.com>>>
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:jmh@joelhalpern.com
&g=
t;=C2=A0 =C2=A0 =C2=A0<mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com
>=C2=A0 =
=C2=A0 =C2=A0<mailto:jmh@joelhalpern.com>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0<mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
>=C2=A0 =C2=
=A0 =C2=A0<mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>>> wrote:
&=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Sorry to ask a s=
tupid question.=C2=A0 Whose
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0implementation?
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0The reason I ask is that as far as I
>=C2=A0 =C2=A0 =C2=A0c=
an tell,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0since the
&=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0tenant does not
>=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0have any control access to =
the VTEP,
>=C2=A0 =C2=A0 =C2=A0there is no
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0reason for
>=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the VTEP to
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0have a MAC address in the tenant
&=
gt;=C2=A0 =C2=A0 =C2=A0space.=C2=A0 Yes, the
>=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0device has
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0a physical
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0MAC address.=C2=A0 But the tenant could well=
 be
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0using that MAC
&=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0address.=C2=A0 Yes,
&=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0they would be violating =
the Ethernet spec.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0But =
the whole
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0point of<=
br>>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0segregation is not =
to care about such
>=C2=A0 =C2=A0 =C2=A0issues.
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On the other hand, if you tell me=
 that
>=C2=A0 =C2=A0 =C2=A0the VMWare
>=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0implementation has an
>=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0Ethernet address that is part of the tenant
&=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0space, well,
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0they made up
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0this particular game.
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Yours,
>=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Joel
>=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0On 7/31/2019 1:44 PM, Santosh P K wrote:
>=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > I have checked with =
implementation
>=C2=A0 =C2=A0 =C2=A0in data
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0path.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0When we
>=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0receive a
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 > packet with valid VNI then lookup
>=C2=A0 =C2=
=A0 =C2=A0for MAC will
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0happen and
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0it is VTEP own
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 > MAC then it will be trapped to control
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0plane for
>=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0processing. I think we
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > can have following options
>=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > 1. Optional managment VN=
I
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > 2. Mandato=
ry inner MAC set to VTEP mac
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 > 3. Inner IP TTL set to 1 to avoid
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0forwarding of packet
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0via inner IP
>=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 > address.
>=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Th=
oughts?
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
>=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Thansk
>=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Santosh P K
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 > On Wed, Jul 31, 2019 at 9:20 AM Greg
&g=
t;=C2=A0 =C2=A0 =C2=A0Mirsky
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0<gr=
egimirsky@gmail.com
>=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com>=

>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com &=
lt;mailto:gregim=
irsky@gmail.com>>
>=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com <mailto:gr=
egimirsky@gmail.com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0<mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:<=
a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail=
.com
>=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.c=
om
>=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com>>
>=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com <mailto:<=
a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail=
.com>
>=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.c=
om>>>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 > <mailto:gregimirsky@gmail.com
>=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com=
 <mailto:=
gregimirsky@gmail.com>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com
>=C2=A0 =
=C2=A0 =C2=A0<mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com
>=C2=A0 =
=C2=A0 =C2=A0<mailto:gregimirsky@gmail.com>>>
>=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com
>=C2=A0 =C2=A0 =C2=A0=
<mailto:gregi=
mirsky@gmail.com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0<mailto:gr=
egimirsky@gmail.com <mailto:gregimirsky@gmail.com>>
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com
>=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com>
>=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com
>=C2=A0 =C2=A0 =
=C2=A0<mailto:gregimirsky@gmail.com>>>>>> wrote:
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Hi Dinesh,
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0thank you=
 for your consideration
>=C2=A0 =C2=A0 =C2=A0of the
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0proposal and>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0questions. What
>=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0w=
ould you see as the scope of
>=C2=A0 =C2=A0 =C2=A0testing the
>=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0connectivity for the
>=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0s=
pecific VNI? If it is
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0t=
enant-to-tenant, then
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0VTEPs
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based on its similarity to the
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 12:03 PM
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=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0As long as the i=
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s
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er than
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 =C2=A0loopback IP
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 local
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=A0 =C2=A0 >
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gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Dinesh
>=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=
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=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On Wed, Jul 31, 2019 at 5:=
48 AM
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Greg Mirsky
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=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Wi=
th that new text, what
>=C2=A0 =C2=A0 =C2=A0can be the
>=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0value of
=
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the destination
>=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0MAC in the inner Ethernet? I
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0tend to
>=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0believe
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0that it can be
>=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0anything and ignored by the
>=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0reciever VTEP.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0Also, if the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0trapping is base=
d on VNI
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0number, the>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0destination IP address=

>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0of the inner IP packet
>=C2=A0 =C2=
=A0 =C2=A0can from
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0the =
range
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0127/8 for IP=
v4,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0and for IPv6 from the range
>=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A00:0:0:0:0:FFFF:7F00:0/104. =
And
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0lastly, the TTL to be
>=C2=A0 =
=C2=A0 =C2=A0set to 1 (no
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0change here).
>=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Much appreci=
ate your
>=C2=A0 =C2=A0 =C2=A0comments,
>=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0questions, and
>=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0suggestions.
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Best regards,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Greg
>=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
&g=
t; 

=


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From: Santosh P K 
Date: Thu, 3 Oct 2019 19:50:50 +0530
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: "Joel M. Halpern" 
Cc: xiao.min2@zte.com.cn, rtg-bfd WG , nvo3@ietf.org,  "T. Sridhar" , bfd-chairs@ietf.org
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--000000000000b9e85c0594024b8a
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Joel,
    Sure based on how the discussion goes will modify or keep the document
as it is.

Thanks
Santosh P K

On Wed, Sep 25, 2019 at 8:29 AM Joel M. Halpern  wrote=
:

> As far as I can tell, the current document we have in front of us is
> explicit that the messages are originated and terminated at the VNI.  If
> you want some other behavior, then we need a document that describes
> that behaviors.
>
> Yours,
> Joel
>
> On 9/24/2019 10:39 PM, xiao.min2@zte.com.cn wrote:
> > Hi Santosh,
> >
> >
> > With regard to the question whether we should allow multiple BFD
> > sessions for the same VNI or not, IMHO we should allow it, more
> > explanation as follows.
> >
> > Below is a figure derived from figure 2 of RFC8014 (An Architecture for
> > Data-Center Network Virtualization over Layer 3 (NVO3)).
> >
> >                      |         Data Center Network (IP)        |
> >                      |                                         |
> >                      +-----------------------------------------+
> >                           |                           |
> >                           |       Tunnel Overlay      |
> >              +------------+---------+       +---------+------------+
> >              | +----------+-------+ |       | +-------+----------+ |
> >              | |  Overlay Module  | |       | |  Overlay Module  | |
> >              | +---------+--------+ |       | +---------+--------+ |
> >              |           |          |       |           |          |
> >       NVE1   |           |          |       |           |          | NV=
E2
> >              |  +--------+-------+  |       |  +--------+-------+  |
> >              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
> >              |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
> >              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
> >              +----+-----+----+------+       +----+-----+-----+-----+
> >                   |     |    |                   |     |     |
> >                   |     |    |                   |     |     |
> >                   |     |    |                   |     |     |
> >            -------+-----+----+-------------------+-----+-----+-------
> >                   |     |    |     Tenant        |     |     |
> >              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
> >                  +---+ +---+ +---+             +---+ +---+   +---+
> >                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
> >                  +---+ +---+ +---+             +---+ +---+   +---+
> >
> > To my understanding, the BFD sessions between NVE1 and NVE2 are actuall=
y
> > initiated and terminated at VAP of NVE.
> >
> > If the network operator want to set up one BFD session between VAP1 of
> > NVE1 and VAP1of NVE2, at the same time another BFD session between VAP3
> > of NVE1 and VAP3 of NVE2, although the two BFD sessions are for the sam=
e
> > VNI1, I believe it's reasonable, so that's why I think we should allow
> it.
> >
> >
> > Of course, in RFC8014 it also says:
> >
> > "Note that two different Tenant Systems (and TSIs) attached to a common
> NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as they conne=
ct
> to the same Virtual Network."
> >
> > Some people may argue that all Tenant Systems connecting to the same
> > Virtual Network MUST share one VAP, if that's true, then VAP1 and VAP3
> > should merge into one VAP and my explanation doesn't work. Copying to
> > NVO3 WG to involve more experts, hope for your clarifications and
> comments.
> >
> >
> > Best Regards,
> >
> > Xiao Min
> >
> > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*SantoshPK 
> > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Greg Mirsky ;
> > *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*draft-ietf-bfd-vxlan@ietf.org
> > ;Dinesh Dutt ;rtg-bfd
> > WG ;Joel M. Halpern ;T. Sridhar
> > ;bfd-chairs@ietf.org ;
> > *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8823=E6=97=A5 05:3=
9
> > *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: BFD over VXLAN: Trapping BFD Contro=
l packet at VTEP*
> > Greg,
> >      Please see inline reply tagged [SPK]. I have added text requested.
> >
> > Thanks
> > Santosh P K
> >
> > On Fri, Aug 16, 2019 at 4:59 AM Greg Mirsky  > > wrote:
> >
> >     Hi Santosh,
> >     thank you for your comments. Please find my notes in-lined and
> >     tagged GIM>>.
> >
> >     Regards,
> >     Greg
> >
> >     On Tue, Aug 13, 2019 at 10:24 PM Santosh P K
> >     =
>
> >     wrote:
> >
> >         Greg,
> >             Thanks for updated version of document. Here are few
> >         comments on new draft.
> >
> >         Section 4:
> >         Destination MAC: This MUST NOT be of one of tenant's MAC
> >                   addresses.  The MAC address MAY be configured, or it
> >         MAY be
> >                   learned via a control plane protocol.  The details of
> >         how the
> >                   MAC address is obtained are outside the scope of this
> >         document.
> >
> >         I think we may need to give background on why we are saying MAC
> >         address MUST not be one of tenant's MAC address. Like in this
> >         thread we have discussed one of the tenant could have borrowed
> >         the same VTEP mac address and we if we have to use BFD then we
> >         need to avoid that conflict to ensure BFD packets get observed
> >         in the VTEP itself. Should we add a section before 4 to set tha=
t
> >         context so that above text makes more sense in that context?
> >
> >     GIM>> Certainly. Please share the text you'd like to add.
> >
> > [SPK]  Proposed text for why we should not use VTEP MAX address as
> > tenant MAC address.
> >
> > "In some scenarios tenant MAC is borrowed from VTEP MAC address. VXLAN
> > BFD MUST terminate BFD session at VTEP and MUST not forward BFD packets
> > to tenants. To terminate VXLAN BFD packets at VTEP, deployment MUST
> > ensure that there are no tenant VM which barrows VTEP MAC address."
> >
> >
> >
> >             IP header:
> >                   Destination IP: IP address MUST NOT be of one of
> >         tenant's IP
> >                   addresses.  IP address MAY be selected from the range
> >         127/8 for
> >                   IPv4, for IPv6 - from the range
> 0:0:0:0:0:FFFF:7F00:0/104.
> >
> >                   TTL: MUST be set to 1 to ensure that the BFD packet i=
s
> not
> >                   routed within the L3 underlay network.
> >
> >
> >         I think we have added some text to address Sridhar comments on
> >         why TTL MUST be 1 and dest IP address MUST be 127/8 range. I se=
e
> >         that text is missing now.
> >
> >     GIM>> My apologies that I've missed to include the text from anothe=
r
> >     discussion thread. I believe the following would be complete:
> >                TTL or Hop Limit: MUST be set to 1 to ensure that the BF=
D
> >               packet is not routed within the Layer 3 underlay network.
> >     This
> >               addresses the scenario when the inner IP destination
> >     address is
> >               of VXLAN gateway and there is a router in underlay which
> >               removes the VXLAN header, then it is possible to route th=
e
> >               packet as VXLAN  gateway address is routable address.
> >
> > [SPK] This text looks good.
> >
> >
> >         Section 5.1:
> >         For such packets, the BFD session MUST be identified
> >             using the following three-tuples of fields of the inner
> >         header: the
> >             source IP, the destination IP, and the source UDP port
> >         number present
> >             in the IP header carried by the payload of the packet in
> VXLAN
> >             encapsulation.  If BFD packet is received with non-zero You=
r
> >         Discriminator, then BFD session MUST be demultiplexed only with
> Your
> >             Discriminator as the key.
> >
> >         Just with 3 tuple we will not be able to demux packet. We need
> >         to consider VNI as well if we have multiple BFD session between
> >         same pair of VTEP.
> >
> >     GIM>> This is one of comments from Carlos we need to address. Your
> >     comment have helped me to form the question:
> >
> >         What is the goal running multiple BFD sessions between the pair
> >         of VTEPs?
> >
> > [SPK] The goal of the multiple BFD session is to ensure check livelines=
s
> > of VXLAN tunnel. There is already a good amount of debate on this topic
> > that do we really need that? As per RFC 5884 we are running BFD per LSP
> > and we might hit scale issues there too. I think it is up to operator t=
o
> > decide how they want to use multiple BFD session per VXLAN tunnel. It
> > could be possible that BFD session with special VNI is run at aggressiv=
e
> > interval where as MAY have multiple BFD sessions for different VNI at a
> > sedate interval, for that matter they could be running in demand mode a=
s
> > well (run P/F sequence only when there is no data following for that
> > VNI). As WG if we think running multiple BFD session make sense then we
> > might need to add appropriate text.
> >
> >     If the goal is to monitor per VNI, then the following text should
> >     describe the demultiplexing of the initial BFD Control packet:
> >         Demultiplexing of IP BFD packet has been defined in Section 3 o=
f
> >         [RFC5881].  Since multiple BFD sessions may be running between
> two
> >         VTEPs, there needs to be a mechanism for demultiplexing receive=
d
> BFD
> >         packets to the proper session.  For demultiplexing packets with
> Your
> >         Discriminator equal to 0, a BFD session MUST be identified usin=
g
> the
> >         logical link over which the BFD Control packet is received.  In
> the
> >         case of VXLAN, the VNI number identifies that logical link.  If
> BFD
> >         packet is received with non-zero Your Discriminator, then BFD
> >     session
> >         MUST be demultiplexed only with Your Discriminator as the key.
> >
> > [SPK]  I think this text for multiple BFD session between same pair of
> > VTEPs for multiple VNI makes sense only if as WG we think that could be
> > use case.
> >
> >     Would there be need to run multiple BFD sessions with the same VNI
> >     number?
> >
> >
> > [SPK] IMHO we should not allow multiple BFD session for the same VNI.
> >
> >
> >
> >
> >         Thanks
> >         Santosh P K
> >
> >
> >         On Fri, Aug 9, 2019 at 4:27 AM Greg Mirsky
> >         > wrote:
> >
> >             Dinesh, thank you for your help, much appreciated.
> >             Hi Joel and Sridhar,
> >             could you please check if the updated text on the inner
> >             Ethernet frame addressed your concern.
> >
> >             On Wed, Aug 7, 2019 at 2:25 PM Dinesh Dutt  >             > wrote:
> >
> >                 Looks god to me Greg. Thank you for your hard work in
> this,
> >
> >                 Dinesh
> >
> >                 On Wed, Aug 7, 2019 at 9:25 AM Greg Mirsky
> >                 >
> >                 wrote:
> >
> >                     Hi Dinesh, Joel, Sridhar, et al.,
> >                     much appreciate the help you've given me sharing
> >                     your expertise. I hope that the updates you will
> >                     find in the attached diff and the working copy of
> >                     the draft be closer to the acceptable solution for
> >                     VTEP-VTEP BFD. Please note, that I'll shortly start
> >                     a new discussion thread to address one of Carlos's
> >                     questions on the ambiguity of the text on multiple
> >                     concurrent sessions between the same pair of VTEPs.
> >                     Please review the changes to Sections 4 and 6 and
> >                     share your feedback, suggestions, and questions.
> >
> >                     Regards,
> >                     Greg
> >
> >                     On Mon, Aug 5, 2019 at 6:03 PM Dinesh Dutt
> >                     > wrote:
> >
> >
> >
> >                         On Mon, Aug 5, 2019 at 5:56 PM Greg Mirsky
> >                          >                         > wrote:
> >
> >                             Hi Dinesh,
> >                             thank you for your expedient detailed
> response.
> >                             I believe that the ability to run BFD
> >                             session up to a tenant (VTEP-VTEP-tenant or
> >                             tenant-tenant) was never in jeopardy from
> >                             this specification.
> >                             I'm trying to provide precise specification
> >                             on what can be used ad the destination MAC
> >                             and IP addresses in the inner frame/packet
> >                             as I believe that likely will help to avoid
> >                             interoperability issues.
> >                             I'm interested to learn some more about the
> >                             "martian checking" function. As you know,
> >                             martian addresses have been used as
> >                             destination IP address in LSP Ping and BFD
> >                             over MPLS LSP and PW. I haven't heard that
> >                             any silicon feature caused problems for
> >                             operators using these tools.
> >
> >
> >                         Interesting. I didn't know this aspect of use
> >                         with MPLS ping. Did those packets ever go
> >                         through a firewall though? In any case, maybe
> >                         suggest the use of those addresses with a
> >                         statement that this is how LSP does it, but tha=
t
> >                         other MAC/IP pairs are possible as long as the
> >                         conditions of the endpoint owning the MAC/IP wa=
s
> >                         honored.
> >
> >                         Dinesh
> >
> >
> >                             Regards,
> >                             Greg
> >
> >                             On Mon, Aug 5, 2019 at 3:59 PM Dinesh Dutt
> >                             =
>
> >                             wrote:
> >
> >                                 Hi Greg,
> >
> >                                 That we agree on the problem definition
> >                                 is the first step forward. Your origina=
l
> >                                 document had my cases covered and so I
> >                                 was surprised by the track this thread
> >                                 took. It doesn't matter, we're back on
> >                                 track.
> >
> >                                 My recommendation is to not worry about
> >                                 specifying the precise MAC/IP address
> >                                 used in the inner header. The addresses
> >                                 chosen MUST ensure that the packet is
> >                                 trapped to the control plane of the VTE=
P
> >                                 and not escape to the tenant if the BFD
> >                                 is to the VTEP. Any solution MUST also
> >                                 not preclude the use of the BFD by
> >                                 tenant systems for that VNI. There are
> >                                 many ways an implementer can choose to
> >                                 implement this. For example, the inner
> >                                 MAC address is whatever the VTEP
> >                                 implementer would return if ARP'd for
> >                                 the IP address used in the inner header
> >                                 in the given VNI. The implementer can
> >                                 pick a fixed MAC address, one that they
> >                                 own etc. Multiple BFD sessions can be
> >                                 run for testing path connectivity on
> >                                 more than one VNIs. Limits should be in
> >                                 place to avoid overwhelming the receive=
r
> >                                 with BFD messages (you had words about
> >                                 this in your currently published
> >                                 draft).  If the VNI is irrelevant in th=
e
> >                                 test i.e. only the VXLAN pipe at the
> >                                 VTEP is being tested. the user can use
> >                                 any VNI active on the VTEP on which the
> >                                 VTEP owns an IP address.
> >
> >                                 I'm concerned about the use of 127/8
> >                                 address only because of firewalls or
> >                                 implementations that drop packets with
> >                                 these addresses as either the source or
> >                                 destination. For example, on many
> >                                 merchant silicon, I don't believe you
> >                                 can turn off martian checking and drops
> >                                 *only* for VXLAN-encapsulated BFD
> >                                 packets. I don't know what the Linux
> >                                 kernel does today on such packets, for
> >                                 example (or Hyper-V). I'd like a
> >                                 solution that doesn't demand additional
> >                                 or new chip functionality or require
> >                                 additional middle-box hole punch.
> >
> >                                 Why do you feel you MUST to specify the
> >                                 MAC/IP address on the inner packet? Wha=
t
> >                                 am I missing here?
> >
> >                                 Dinesh
> >
> >                                 On Mon, Aug 5, 2019 at 3:04 PM Greg
> >                                 Mirsky  >                                 > wrote:
> >
> >                                     Hi Dinesh,
> >                                     what do you see as the way forward?
> >                                     I agree, that the proposed text
> >                                     doesn't work for multi-VNI
> >                                     concurrent monitoring because these
> >                                     VNIs are tenant's VNIs. And in that
> >                                     case, we need to specify another
> >                                     mechanism to trap the BFD Control
> >                                     packet at VTEP. It seems that VTEP'=
s
> >                                     Ethernet address must be used as th=
e
> >                                     destination MAC address in the inne=
r
> >                                     Ethernet frame. The destination IP
> >                                     address may be either VTEP's addres=
s
> >                                     of martian (I do prefer martian).
> >                                     Let me give it  try:
> >                                     NEW TEXT:
> >
> >                                         To monitor continuity of the
> >                                         path between two VTEPs, an
> >                                         operator MUST select a VNI
> >                                         number to be used as Management
> >                                         VNI. Management VNI number MUST
> >                                         NOT be one of the tenant's VNIs
> >                                         to prevent sending VXLAN packet=
s
> >                                         received on Management VNI to a
> >                                         tenant. VNI number 1 is
> >                                         RECOMMENDED as the default for
> >                                         Management VNI. [Ed.note: What
> >                                         we set the Destination MAC to?
> >                                         Can it be invalid MAC that MUST
> >                                         be ignored on receipt?]
> >
> >                                         If an implementation supports
> >                                         concurrent monitoring of
> >                                         multiple VNIs, then the value o=
f
> >                                         VNI number MAY be one of
> >                                         tenant's VNIs. The destination
> >                                         MAC address in the inner
> >                                         Ethernet frame encapsulating BF=
D
> >                                         Control packet MUST be MAC
> >                                         associated with the remote VTEP=
.
> >                                         The destination IP address of
> >                                         the inner IP packet MUST be
> >                                         selected from the range 127/8
> >                                         for IPv4, and for IPv6 from the
> >                                         range 0:0:0:0:0:FFFF:7F00:0/104=
.
> >                                         The TTL value in the inner IP
> >                                         header MUST be set to 1.
> >
> >                                     Regards,
> >                                     Greg
> >
> >                                     On Sun, Aug 4, 2019 at 9:07 AM
> >                                     Dinesh Dutt  >                                     > wrote:
> >
> >                                         Hi Greg,
> >
> >                                         Thanks for your clarifications.
> >                                         I agree with your sentiment on
> >                                         why you're running BFD over
> >                                         VXLAN between VTEPs. I wasn't
> >                                         arguing against it at all. All =
I
> >                                         was saying was pointing to the
> >                                         limitations of the use of
> >                                         management VNI. I spoke to some
> >                                         operators who're running EVPN
> >                                         and mentioned the discussion on
> >                                         this thread. They concur that
> >                                         they're using specific VNIs to
> >                                         test connectivity over that VNI
> >                                         between VTEPs to ensure
> >                                         misconfiguration doesn't lead t=
o
> >                                         blackholes. My statements are
> >                                         based in real world operator
> >                                         experience. And I was providing
> >                                         language that ensured packets
> >                                         didn't leak across to tenants
> >                                         when they were destined to VTEP=
s.
> >
> >                                         Dinesh
> >
> >                                         On Sat, Aug 3, 2019 at 10:34 AM
> >                                         Greg Mirsky
> >                                          >                                         >
> >                                         wrote:
> >
> >                                             Hi Dinesh,
> >                                             many thanks for your
> >                                             detailed updates on how som=
e
> >                                             implementations process
> >                                             VXLAN header and the inner
> >                                             Ethernet frame. These are
> >                                             very helpful in achieving
> >                                             the workable solution for
> >                                             the problem at hand.
> >                                             You've noted that a path
> >                                             between VTEPs may be
> >                                             monitored in the underlay
> >                                             network by merely
> >                                             establishing a BFD session.
> >                                             That is true, but by using
> >                                             BFD with VXLAN encapsulatio=
n
> >                                             between the pair of VTEPs w=
e
> >                                             are extending the OAM domai=
n
> >                                             by including, to some
> >                                             extent, VXLAN forwarding
> >                                             engine. Abstract in RFC 588=
0
> >                                             defines the goal and the
> >                                             domain in which BFD protoco=
l
> >                                             can detect a fault as:
> >                                                 This document describes
> >                                             a protocol intended to
> >                                             detect faults in the
> >                                                 bidirectional path
> >                                             between two forwarding
> >                                             engines, including
> >                                                 interfaces, data
> >                                             link(s), and to the extent
> >                                             possible the forwarding
> >                                                 engines themselves, wit=
h
> >                                             potentially very low latenc=
y.
> >                                             Thus, BFD in the underlay
> >                                             will exercise a part of IP
> >                                             forwarding engine while BFD
> >                                             with VXLAN encapsulation,
> >                                             ran between the same pair o=
f
> >                                             VTEPs, extends the OAM
> >                                             domain. At the same time,
> >                                             defining BFD between tenant
> >                                             systems in outside the goal
> >                                             of this specification. But
> >                                             VXLAN BFD session between
> >                                             VTEPs may be useful in
> >                                             monitoring e2e path between
> >                                             tenants, as described in th=
e
> >                                             update to -07:
> >                                                 At the same time, a
> >                                             service layer BFD session
> >                                             may be used between the
> >                                                 tenants of VTEPs IP1 an=
d
> >                                             IP2 to provide end-to-end
> >                                             fault management.
> >                                                 In such case, for VTEPs
> >                                             BFD control packets of that
> >                                             session are
> >                                                 indistinguishable from
> >                                             data packets.  If end-to-en=
d
> >                                             defect detection
> >                                                 is realized as the set
> >                                             of concatenated OAM domains=
,
> >                                             e.g., VM1-1 - IP1
> >                                                 -- IP2 - VM2-1, then th=
e
> >                                             BFD session over VXLAN
> >                                             between VTEPs SHOULD
> >                                                 follow the procedures
> >                                             described in Section 6.8.17
> >                                             [RFC5880].
> >                                             I've attached the current
> >                                             working version of the draf=
t.
> >
> >                                             Regards,
> >                                             Greg
> >
> >
> >                                             On Fri, Aug 2, 2019 at 5:43
> >                                             PM Dinesh Dutt
> >                                              >                                             >
> >                                             wrote:
> >
> >                                                 What I mean is "How do
> >                                                 you infer that it
> >                                                 excludes the case I'm
> >                                                 talking about?".
> >
> >                                                 Dinesh
> >
> >                                                 On Fri, Aug 2, 2019 at
> >                                                 5:41 PM Dinesh Dutt
> >                                                  >                                                  >>
> >                                                 wrote:
> >
> >                                                     The abstract reads
> >                                                     this: "
> >
> >                                                     This document
> describes the use of the Bidirectional Forwarding
> >                                                         Detection (BFD)
> protocol in point-to-point Virtual eXtensible Local
> >                                                         Area Network
> (VXLAN) tunnels forming up an overlay network."
> >
> >                                                     How do you infer
> >                                                     what you said?
> >
> >                                                     Dinesh
> >
> >
> >                                                     On Fri, Aug 2, 2019
> >                                                     at 5:38 PM Joel M.
> >                                                     Halpern
> >                                                      >                                                      jmh@joelhalpern.com>>
> >                                                     wrote:
> >
> >                                                         I am going by
> >                                                         what the draft
> >                                                         says its purpos=
e
> >                                                         is.  If you
> >                                                         (Dinesh) want
> >                                                         the draft to
> >                                                         fulfill a
> >                                                         different
> >                                                         purpose, then
> >                                                         either ask the
> >                                                         chairs to
> >                                                         take this draft
> >                                                         back to the WG,
> >                                                         or write a
> >                                                         separate draft.
> >                                                         As currently
> >                                                         written, the
> >                                                         behavior Greg
> >                                                         proposed meets
> >                                                         the needs, and
> >                                                         does so in a wa=
y
> >                                                         that is
> >                                                         consistent with
> >                                                         VxLAN.
> >
> >                                                         Yours,
> >                                                         Joel
> >
> >                                                         On 8/2/2019 8:3=
0
> >                                                         PM, Dinesh Dutt
> >                                                         wrote:
> >                                                          > What is the
> >                                                         stated purpose
> >                                                         of this BFD
> >                                                         session? The
> >                                                         VTEP
> >                                                         reachability is
> >                                                          > determined b=
y
> >                                                         the underlay, I
> >                                                         don't need
> >                                                         VXLAN-encaped
> >                                                         packet for that=
.
> >                                                          > Do we agree?
> >                                                          >
> >                                                          > If I want to
> >                                                         test the VXLAN
> >                                                         encap/decap
> >                                                         functionality
> >                                                         alone, picking
> any
> >                                                          > single VNI
> >                                                         maybe fine. But
> >                                                         is this all any
> >                                                         network operato=
r
> >                                                         wants? Why?
> >                                                          > In what
> >                                                         situations has
> >                                                         this been a
> >                                                         problem? I
> >                                                         suspect
> >                                                         operators also
> >                                                          > want to
> >                                                         verify path
> >                                                         continuity over
> >                                                         a specific VNI.
> >                                                         If you say this
> is
> >                                                          > not defined
> >                                                         by the document=
,
> >                                                         I disagree
> >                                                         because the
> >                                                         current version
> >                                                          > talks about
> >                                                         controlling the
> >                                                         number of BFD
> >                                                         sessions betwee=
n
> >                                                         the VTEPs
> >                                                          > (see section
> >                                                         3). More
> >                                                         importantly,
> >                                                         this is a real
> >                                                         problem that
> >                                                         operators
> >                                                          > like to
> verify.
> >                                                          >
> >                                                          > Dinesh
> >                                                          >
> >                                                          > On Fri, Aug
> >                                                         2, 2019 at 5:08
> >                                                         PM Joel M.
> >                                                         Halpern
> >                                                         <
> jmh@joelhalpern.com
> >                                                          jmh@joelhalpern.com>
> >
> >                                                          >
> >                                                          jmh@joelhalpern.com
> >                                                          jmh@joelhalpern.com>>>
> >                                                         wrote:
> >                                                          >
> >                                                          >     What is
> >                                                         special about
> >                                                         the management
> >                                                         VNI is precisel=
y
> >                                                         that it is NOT =
a
> >                                                          >     tenant
> >                                                         VNI.  The VxLAN
> >                                                         administration
> >                                                         does know how i=
t
> >                                                         allocates VNI t=
o
> >                                                          >     tenants,
> >                                                         and which VNI i=
t
> >                                                         has allocated.
> >                                                         In contrast, it
> >                                                         does not know
> >                                                          >     which IP
> >                                                         addresses or MA=
C
> >                                                         adddresses teh
> >                                                         tenant is using
> >                                                         or may plan
> >                                                          >     to use.
> >                                                          >
> >                                                          >     Yours,
> >                                                          >     Joel
> >                                                          >
> >                                                          >     On
> >                                                         8/2/2019 6:41
> >                                                         PM, Dinesh Dutt
> >                                                         wrote:
> >                                                          >      > The
> >                                                         assumption of a=
n
> >                                                         IP address
> >                                                         within any VNI
> >                                                         is suspect that
> way.
> >                                                          >      > What'=
s
> >                                                         special about a
> >                                                         single VNI, the
> >                                                         management VNI?
> >                                                         The VTEP IP
> >                                                          >      >
> >                                                         address does no=
t
> >                                                         belong in
> >                                                         reality in any
> >                                                         VNI...
> >                                                          >      >
> >                                                          >      > Dines=
h
> >                                                          >      >
> >                                                          >      > On
> >                                                         Fri, Aug 2, 201=
9
> >                                                         at 3:17 PM Joel
> >                                                         M. Halpern
> >                                                          >
> >                                                           <
> jmh@joelhalpern.com   jmh@joelhalpern.com >
> >                                                          >      >
> >                                                          jmh@joelhalpern.com
> >                                                          jmh@joelhalpern.com>
> >                                                          jmh@joelhalpern.com
> >                                                          jmh@joelhalpern.com>>>>
> >                                                         wrote:
> >                                                          >      >
> >                                                          >      >
> >                                                           Your response
> >                                                         seems to miss
> >                                                         two points:
> >                                                          >      >
> >                                                          >      >
> >                                                           First, the
> >                                                         problem you
> >                                                         describe is not
> >                                                         what the
> >                                                         document says
> >                                                          >     it is
> >                                                          >      >
> >                                                           solving.  To
> >                                                         the degree it
> >                                                         discusses it at
> >                                                         all, the docume=
nt
> >                                                          >     says "
> >                                                          >      >
>  In
> >                                                          >      >
> >                                                           most cases, a
> >                                                         single BFD
> >                                                         session is
> >                                                         sufficient for
> >                                                         the given
> >                                                          >     VTEP to
> >                                                          >      >
> >                                                           monitor the
> >                                                         reachability of
> >                                                         a remote VTEP,
> >                                                         regardless of t=
he
> >                                                          >     number o=
f
> >                                                          >      >
> >                                                           VNIs in
> common. "
> >                                                          >      >
> >                                                          >      >
> >                                                           Second, you
> >                                                         assume the
> >                                                         existence of an
> >                                                         IP address for =
a
> >                                                         VTEP
> >                                                          >     within a
> >                                                          >      >
> >                                                           VNI.  As with
> >                                                         the MAC address=
,
> >                                                         the VTEP does
> >                                                         not have an IP
> >                                                          >     address
> >                                                          >      >
> >                                                           within the
> >                                                         VNI.  Some
> >                                                         implementations
> >                                                         may have create=
d
> >                                                         such a
> >                                                          >     thing,
> >                                                          >      >     b=
ut
> >                                                          >      >
> >                                                           the general
> >                                                         construct, as
> >                                                         defined to date=
,
> >                                                         does not suppor=
t
> >                                                         such.
> >                                                          >      >
> >                                                          >      >     I=
n
> >                                                         short, you are
> >                                                         requiring a
> >                                                         behavior that
> >                                                         violates the
> >                                                          >
>  architectural
> >                                                          >      >
> >                                                           structure of
> >                                                         overlay /
> >                                                         underlay
> >                                                         separation, and
> >                                                         common
> >                                                          >     usage.
> >                                                         And you
> >                                                          >      >
> >                                                           are doing so
> >                                                         to support a us=
e
> >                                                         case that the
> >                                                         working group
> >                                                         has not
> >                                                          >      >
> >                                                           indicated in
> >                                                         the document as
> >                                                         important.
> >                                                          >      >
> >                                                          >      >
>  Yours,
> >                                                          >      >
>  Joel
> >                                                          >      >
> >                                                          >      >     O=
n
> >                                                         8/2/2019 5:01
> >                                                         PM, Dinesh Dutt
> >                                                         wrote:
> >                                                          >      >      =
>
> >                                                         Joel,
> >                                                          >      >      =
>
> >                                                          >      >      =
>
> >                                                         You understood
> >                                                         correctly.
> >                                                          >      >      =
>
> >                                                          >      >      =
>
> >                                                         The VNIs may no=
t
> >                                                         share fate due
> >                                                         to
> >
>  misconfiguration. And
> >                                                         I
> >                                                          >     strongly
> >                                                          >      >      =
>
> >                                                         suspect someone
> >                                                         will want to us=
e
> >                                                         BFD for that
> >                                                         because its
> >                                                          >     about
> >                                                          >      >
> >                                                           checking
> >                                                          >      >      =
>
> >                                                         path continuity
> >                                                         as stated by th=
e
> >                                                         draft. As long
> >                                                         as there's a
> >                                                          >      >
> >                                                           valid IP
> >                                                          >      >      =
>
> >                                                         (because it's
> >                                                         BFD) owned by
> >                                                         the VTEP in tha=
t
> >                                                         VNI, you can
> >                                                          >     use BFD =
in
> >                                                          >      >      =
>
> >                                                         that VNI. Thats
> >                                                         all that you
> >                                                         need to
> >                                                         dictate.  That
> >                                                         IP address
> >                                                          >      >
> >                                                           has a MAC
> >                                                          >      >      =
>
> >                                                         address and you
> >                                                         can use that on
> >                                                         the inner frame=
.
> >                                                         That is
> >                                                          >     all norm=
al
> >                                                          >      >      =
>
> >                                                         VXLAN
> >                                                         processing. The
> >                                                         outer IP is
> >                                                         always that of
> >                                                         the VTEP.
> >                                                          >      >      =
>
> >                                                          >      >      =
>
> >                                                         Dinesh
> >                                                          >      >      =
>
> >                                                          >      >      =
>
> >                                                         On Fri, Aug 2,
> >                                                         2019 at 11:03 A=
M
> >                                                         Joel M. Halpern
> >                                                          >      >
> >                                                           <
> jmh@joelhalpern.com   jmh@joelhalpern.com >
> >                                                          >
> >                                                            jmh@joelhalpern.com   jmh@joelhalpern.com >>
> >                                                          >      >      =
>
> >                                                          jmh@joelhalpern.com
> >                                                          jmh@joelhalpern.com>
> >                                                          jmh@joelhalpern.com
> >                                                          jmh@joelhalpern.com>>
> >                                                          >
> >                                                            jmh@joelhalpern.com   jmh@joelhalpern.com >>>> wrote:
> >                                                          >      >      =
>
> >                                                          >      >
> >                                                          >     If I am
> >                                                         reading your
> >                                                         various emails
> >                                                         correctly Dines=
h
> >                                                          >     (and I
> >                                                          >      >
> >                                                           may have
> >                                                          >      >
> >                                                          >     missed
> >                                                         something) you
> >                                                         are trying to
> >                                                         use the MAC
> address
> >                                                          >      >
> >                                                           because you
> >                                                          >      >
> >                                                          >     want
> >                                                          >      >
> >                                                          >     to be
> >                                                         able to send
> >                                                         these BFD
> >                                                         packets over
> >                                                         arbitrary VNI t=
o
> >                                                          >      >
> >                                                           monitor the
> >                                                          >      >
> >                                                          >     VNI.
> >                                                         That is not a
> >                                                         requirement
> >                                                         identified in t=
he
> >                                                          >     document=
.
> >                                                          >      >     I=
t
> >                                                         is not
> >                                                          >      >
> >                                                          >     even a
> >                                                         problem I
> >                                                         understand,
> >                                                         since all the
> >                                                         VNI between an
> >                                                          >      >
> >                                                           ingress and
> >                                                          >      >
> >                                                          >     egress
> >                                                         VTEP share fate=
.
> >                                                          >      >      =
>
> >                                                          >      >
> >                                                          >     Yours,
> >                                                          >      >
> >                                                          >     Joel
> >                                                          >      >      =
>
> >                                                          >      >
> >                                                          >     On
> >                                                         8/2/2019 1:44
> >                                                         PM, Dinesh Dutt
> >                                                         wrote:
> >                                                          >      >
> >                                                          >      > Thank=
s
> >                                                         for verifying
> >                                                         this. On Linux
> >                                                         and hardware
> >                                                          >     routers
> >                                                          >      >
> >                                                           that I'm
> >                                                          >      >
> >                                                          >     aware
> >                                                          >      >
> >                                                          >      > of
> >                                                         (Cisco circa
> >                                                         2012 and
> >                                                         Cumulus), the
> >                                                         physical MAC
> >                                                          >     address =
is
> >                                                          >      >
> >                                                          >     reused
> >                                                          >      >
> >                                                          >      > acros=
s
> >                                                         the VNIs on the
> >                                                         VTEP. Did you
> >                                                         check on a
> non-VMW
> >                                                          >      >
> >                                                           device?
> >                                                          >      >
> >                                                          >     This is
> >                                                          >      >
> >                                                          >      > more
> >                                                         for my own
> >                                                         curiosity.
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      > To
> >                                                         address the
> >                                                         general case,
> >                                                         can we not
> define a
> >                                                          >      >
> >                                                           well-known (o=
r
> >                                                          >      >
> >                                                          >     reserve
> >                                                          >      >
> >                                                          >      > one)
> >                                                         unicast MAC
> >                                                         address for use
> >                                                         with VTEP? If
> >                                                         the MAC
> >                                                          >      >
> >                                                           address is
> >                                                          >      >
> >                                                          >      >
> >                                                         configurable in
> >                                                         BFD command,
> >                                                         this can be moo=
t.
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      > Dines=
h
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      > On
> >                                                         Fri, Aug 2, 201=
9
> >                                                         at 10:27 AM
> >                                                         Santosh P K
> >                                                          >      >
> >                                                          >      >
> >                                                         <
> santosh.pallagatti@gmail.com
> >                                                          santosh.pallagatti@gmail.com>
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >
> >                                                          >      >
> >                                                            santosh.pallagatti@gmail...com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >>
> >                                                          >      >
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >
> >                                                          >      >
> >                                                            santosh.pallagatti@gmail...com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >>>
> >                                                          >      >
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >
> >                                                          >      >
> >                                                            santosh.pallagatti@gmail...com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >>
> >                                                          >      >
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >
> >                                                          >      >
> >                                                            santosh.pallagatti@gmail...com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >>>>>
> wrote:
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >     I
> >                                                         have cross
> >                                                         checked point
> >                                                         raised about MA=
C
> >                                                         address
> >                                                          >      >
> >                                                           usage. It is
> >                                                          >      >
> >                                                          >      >
> >                                                           possible that
> >                                                         tenant could be
> >                                                         using physical
> MAC
> >                                                          >      >
> >                                                           address and
> >                                                          >      >
> >                                                          >     when a
> >                                                          >      >
> >                                                          >      >
> >                                                           packet comes
> >                                                         with valid VNI
> >                                                         with a MAC
> address
> >                                                          >     that is
> >                                                          >      >
>  being
> >                                                          >      >
> >                                                          >     used by
> >                                                          >      >
> >                                                          >      >
> >                                                           tenant then
> >                                                         packet will be
> >                                                         sent to that
> tenant.
> >                                                          >     This rul=
es
> >                                                          >      >
> >                                                          >     out the
> >                                                          >      >
> >                                                          >      >
> >                                                           fact that we
> >                                                         could use
> >                                                         physical MAC
> >                                                         address as
> >                                                          >     inner
> >                                                          >      >
>  MAC to
> >                                                          >      >
> >                                                          >     ensure
> >                                                          >      >
> >                                                          >      >
> >                                                           packets get
> >                                                         terminated at
> >                                                         VTEP itself.
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
>  Thanks
> >                                                          >      >
> >                                                          >      >
> >                                                           Santosh P K
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >     O=
n
> >                                                         Wed, Jul 31,
> >                                                         2019 at 11:00 A=
M
> >                                                         Santosh P K
> >                                                          >      >
> >                                                          >      >
> >                                                           <
> santosh.pallagatti@gmail.com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >
> >                                                          >      >
> >                                                            santosh.pallagatti@gmail...com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >>
> >                                                          >      >
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >
> >                                                          >      >
> >                                                            santosh.pallagatti@gmail...com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >>>
> >                                                          >      >
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >
> >                                                          >      >
> >                                                            santosh.pallagatti@gmail...com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >>
> >                                                          >      >
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >
> >                                                          >      >
> >                                                            santosh.pallagatti@gmail...com 
> >                                                          >
> >                                                            santosh.pallagatti@gmail.com >>>>>
> >                                                          >      >
> >                                                          >      >
>  wrote:
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                           Joel,
> >                                                          >      >
> >                                                          >      >
> >                                                               Thanks fo=
r
> >                                                         your inputs. I
> >                                                         checked
> >                                                          >      >
> >                                                           implementatio=
n
> >                                                         within
> >                                                          >      >
> >                                                          >      >
> >                                                           Vmware.
> >                                                         Perhaps I shoul=
d
> >                                                         have been more
> clear
> >                                                          >      >
> >                                                           about MAC
> >                                                          >      >
> >                                                          >     address
> >                                                          >      >
> >                                                          >      >
> >                                                           space while
> >                                                         checking
> >                                                         internally. I
> >                                                         will cross
> >                                                          >      >
> >                                                           check again f=
or
> >                                                          >      >
> >                                                          >      >
> >                                                           the same and
> >                                                         get back on thi=
s
> >                                                         list.
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                           Thanks
> >                                                          >      >
> >                                                          >      >
> >                                                           Santosh P K
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                           On Wed, Jul
> >                                                         31, 2019 at
> >                                                         10:54 AM Joel M=
.
> >                                                          >     Halpern
> >                                                          >      >
> >                                                          >      >
> >                                                           <
> jmh@joelhalpern.com 
> >                                                          >
> >                                                            jmh@joelhalpern.com >  jmh@joelhalpern.com 
> >                                                          >
> >                                                            jmh@joelhalpern.com >>
> >                                                          >      >
> >                                                            jmh@joelhalpern.com   jmh@joelhalpern.com >
> >                                                          >
> >                                                            jmh@joelhalpern.com   jmh@joelhalpern.com >>>
> >                                                          >      >
> >                                                          >
> >                                                            jmh@joelhalpern.com 
> >                                                          >
> >                                                            jmh@joelhalpern.com >  jmh@joelhalpern.com 
> >                                                          >
> >                                                            jmh@joelhalpern.com >>
> >                                                          >      >
> >                                                            jmh@joelhalpern.com   jmh@joelhalpern.com >
> >                                                          >
> >                                                            jmh@joelhalpern.com   jmh@joelhalpern.com >>>>> wrote:
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                               Sorry to
> >                                                         ask a stupid
> >                                                         question.  Whos=
e
> >                                                          >      >
> >                                                           implementatio=
n?
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                               The reaso=
n
> >                                                         I ask is that a=
s
> >                                                         far as I
> >                                                          >     can tell=
,
> >                                                          >      >
> >                                                           since the
> >                                                          >      >
> >                                                          >      >
> >                                                               tenant
> >                                                         does not
> >                                                          >      >
> >                                                          >      >
> >                                                               have any
> >                                                         control access
> >                                                         to the VTEP,
> >                                                          >     there is
> no
> >                                                          >      >
> >                                                          >     reason f=
or
> >                                                          >      >
> >                                                          >      >
> >                                                               the VTEP =
to
> >                                                          >      >
> >                                                          >      >
> >                                                               have a MA=
C
> >                                                         address in the
> >                                                         tenant
> >                                                          >     space.
> >                                                         Yes, the
> >                                                          >      >
> >                                                          >     device h=
as
> >                                                          >      >
> >                                                          >      >
> >                                                               a physica=
l
> >                                                          >      >
> >                                                          >      >
> >                                                               MAC
> >                                                         address.  But
> >                                                         the tenant coul=
d
> >                                                         well be
> >                                                          >      >
> >                                                           using that MA=
C
> >                                                          >      >
> >                                                          >      >
> >                                                               address.
> Yes,
> >                                                          >      >
> >                                                          >      >
> >                                                               they woul=
d
> >                                                         be violating th=
e
> >                                                         Ethernet spec.
> >                                                          >      >
> >                                                           But the whole
> >                                                          >      >
> >                                                          >      >
> >                                                               point of
> >                                                          >      >
> >                                                          >      >
> >
> >                                                           segregation i=
s
> >                                                         not to care
> >                                                         about such
> >                                                          >     issues.
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                               On the
> >                                                         other hand, if
> >                                                         you tell me tha=
t
> >                                                          >     the VMWa=
re
> >                                                          >      >
> >                                                          >      >
> >
> >                                                           implementatio=
n
> >                                                         has an
> >                                                          >      >
> >                                                          >      >
> >                                                               Ethernet
> >                                                         address that is
> >                                                         part of the
> tenant
> >                                                          >      >
> >                                                           space, well,
> >                                                          >      >
> >                                                          >      >
> >                                                               they made
> up
> >                                                          >      >
> >                                                          >      >
> >                                                               this
> >                                                         particular game=
.
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                               Yours,
> >                                                          >      >
> >                                                          >      >
> >                                                               Joel
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >
> >                                                               On
> >                                                         7/31/2019 1:44
> >                                                         PM, Santosh P K
> >                                                         wrote:
> >                                                          >      >
> >                                                          >      >
> >                                                                > I have
> >                                                         checked with
> >                                                         implementation
> >                                                          >     in data
> >                                                          >      >
>  path.
> >                                                          >      >
> >                                                          >     When we
> >                                                          >      >
> >                                                          >      >
> >                                                               receive a
> >                                                          >      >
> >                                                          >      >
> >                                                                > packet
> >                                                         with valid VNI
> >                                                         then lookup
> >                                                          >     for MAC
> will
> >                                                          >      >
> >                                                          >     happen a=
nd
> >                                                          >      >
> >                                                          >      >
> >                                                               it is VTE=
P
> own
> >                                                          >      >
> >                                                          >      >
> >                                                                > MAC
> >                                                         then it will be
> >                                                         trapped to
> control
> >                                                          >      >
> >                                                           plane for
> >                                                          >      >
> >                                                          >      >
> >
> >                                                           processing. I
> >                                                         think we
> >                                                          >      >
> >                                                          >      >
> >                                                                > can
> >                                                         have following
> >                                                         options
> >                                                          >      >
> >                                                          >      >
> >                                                                > 1.
> >                                                         Optional
> >                                                         managment VNI
> >                                                          >      >
> >                                                          >      >
> >                                                                > 2.
> >                                                         Mandatory inner
> >                                                         MAC set to VTEP
> mac
> >                                                          >      >
> >                                                          >      >
> >                                                                > 3.
> >                                                         Inner IP TTL se=
t
> >                                                         to 1 to avoid
> >                                                          >      >
> >                                                           forwarding of
> >                                                         packet
> >                                                          >      >
> >                                                          >      >
> >                                                               via inner
> IP
> >                                                          >      >
> >                                                          >      >
> >                                                                > addres=
s.
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> Thoughts?
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                > Thansk
> >                                                          >      >
> >                                                          >      >
> >                                                                > Santos=
h
> P K
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                > On Wed=
,
> >                                                         Jul 31, 2019 at
> >                                                         9:20 AM Greg
> >                                                          >     Mirsky
> >                                                          >      >
> >                                                          >      >
> >
> >                                                           <
> gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >
> >                                                          >      >
> >                                                            gregimirsky@gmail.com   gregimirsky@gmail.com >>
> >                                                          >
> >                                                            gregimirsky@gmail.com   gregimirsky@gmail.com >
> >                                                          >      >
> >                                                            gregimirsky@gmail.com   gregimirsky@gmail.com >>>
> >                                                          >      >
> >                                                          >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >  gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >>
> >                                                          >      >
> >                                                            gregimirsky@gmail.com   gregimirsky@gmail.com >
> >                                                          >
> >                                                            gregimirsky@gmail.com   gregimirsky@gmail.com >>>>
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          gregimirsky@gmail.com
> >                                                          gregimirsky@gmail.com>
> >                                                          >
> >                                                            gregimirsky@gmail.com >
> >                                                          >      >
> >                                                            gregimirsky@gmail.com   gregimirsky@gmail.com >>
> >                                                          >      >
> >                                                          >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >  gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >>>
> >                                                          >      >
> >                                                          >      >
> >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >
> >                                                          >      >
> >                                                            gregimirsky@gmail.com   gregimirsky@gmail.com >>
> >                                                          >      >
> >                                                          >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >
> >                                                          >      >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >>>>>> wrote:
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >     Hi
> >                                                         Dinesh,
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           thank you for
> >                                                         your
> consideration
> >                                                          >     of the
> >                                                          >      >
> >                                                          >     proposal
> and
> >                                                          >      >
> >                                                          >      >
> >                                                               questions=
.
> >                                                         What
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           would you see
> >                                                         as the scope of
> >                                                          >     testing
> the
> >                                                          >      >
> >                                                          >      >
> >
> >                                                           connectivity
> >                                                         for the
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           specific VNI?
> >                                                         If it is
> >                                                          >      >
> >
>  tenant-to-tenant, then
> >                                                          >      >
> >                                                          >     VTEPs
> >                                                          >      >
> >                                                          >      >
> >                                                               will trea=
t
> >                                                         these
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           packets as
> >                                                         regular user
> >                                                         frames. More
> >                                                          >      >
> >                                                           likely, these
> >                                                          >      >
> >                                                          >      >
> >                                                               could be
> >                                                         Layer 2
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           OAM, e.g. CCM
> >                                                         frames. The
> reason
> >                                                          >     to use
> >                                                          >      >
> >                                                           127/8 for
> >                                                          >      >
> >                                                          >      >
> >                                                               IPv4, and
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >
>  0:0:0:0:0:FFFF:7F00:0/104 for
> >                                                          >     IPv6 is
> >                                                          >      >     t=
o
> >                                                         safeguard
> >                                                          >      >
> >                                                          >      >
> >                                                               from
> leaking
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           Ethernet
> >                                                         frames with BFD
> >                                                         Control
> >                                                          >     packet
> >                                                          >      >     t=
o
> a
> >                                                          >      >
> >                                                          >     tenant.
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           You've
> >                                                         suggested using
> >                                                         a MAC
> >                                                          >     address =
to
> >                                                          >      >
> >                                                           trap the
> >                                                          >      >
> >                                                          >      >
> >                                                               control
> >                                                         packet at
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           VTEP. What
> >                                                         that address
> >                                                         could be? We
> >                                                          >      >
> >                                                           had proposed
> >                                                          >      >
> >                                                          >      >
> >                                                               using the
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           dedicated MAC
> >                                                         and VTEP's MAC
> and
> >                                                          >     both
> >                                                          >      >
>  raised
> >                                                          >      >
> >                                                          >     concerns
> >                                                          >      >
> >                                                          >      >
> >                                                               among VXL=
AN
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           experts. The
> >                                                         idea of using
> >                                                          >     Manageme=
nt
> >                                                          >      >
> >                                                           VNI may
> >                                                          >      >
> >                                                          >     be more
> >                                                          >      >
> >                                                          >      >
> >                                                               acceptabl=
e
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           based on its
> >                                                         similarity to t=
he
> >                                                          >     practice
> >                                                          >      >     o=
f
> >                                                         using
> >                                                          >      >
> >                                                          >      >
> >                                                               Managemen=
t
> >                                                         VLAN.
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           Regards,
> >                                                          >      >
> >                                                          >      >
> >                                                                >     Gr=
eg
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >     On
> >                                                         Wed, Jul 31,
> >                                                         2019 at 12:03 P=
M
> >                                                          >     Dinesh
> >                                                          >      >
>  Dutt
> >                                                          >      >
> >                                                          >      >
> >
> >                                                           <
> didutt@gmail.com 
> >                                                          >
> >                                                            didutt@gmail.com >  
> >                                                          >
> >                                                            didutt@gmail.com >>
> >                                                          >      >
> >                                                            didutt@gmail.com   >
> >                                                          >
> >                                                            didutt@gmail.com   >>>
> >                                                          >      >
> >                                                          >
> >                                                            didutt@gmail.com   >
> >                                                          >
> >                                                            didutt@gmail.com   >>
> >                                                          >      >
> >                                                            didutt@gmail.com   >
> >                                                          >
> >                                                            didutt@gmail.com   >>>>
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                            didutt@gmail.com 
> >                                                          >
> >                                                            didutt@gmail.com >
> >                                                          >      >
> >                                                            didutt@gmail.com   >>
> >                                                          >      >
> >                                                          >
> >                                                            didutt@gmail.com   >
> >                                                          >
> >                                                            didutt@gmail.com   >>>
> >                                                          >      >
> >                                                            didutt@gmail.com   >
> >                                                          >
> >                                                            didutt@gmail.com   >>
> >                                                          >      >
> >                                                          >
> >                                                            didutt@gmail.com   >
> >                                                          >
> >                                                            didutt@gmail.com   >>>>>>
> >                                                          >      >
> >                                                          >      >
> >                                                               wrote:
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           Hi Greg,
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           As long as th=
e
> >                                                         inner MAC
> >                                                          >     address =
is
> >                                                          >      >
>  such
> >                                                          >      >
> >                                                          >     that the
> >                                                          >      >
> >                                                          >      >
> >                                                               packet is
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           trapped to th=
e
> >                                                         CPU, it should =
be
> >                                                          >      >
> >                                                           fine for
> >                                                          >      >
> >                                                          >     use as
> >                                                          >      >
> >                                                          >      >
> >                                                               an inner
> >                                                         MAC is
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           it not?
> >                                                         Stating that is
> >                                                          >     better
> than
> >                                                          >      >
> >                                                           trying to
> >                                                          >      >
> >                                                          >      >
> >                                                               force a
> >                                                         management
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           VNI. What if
> >                                                         someone wants
> >                                                          >     to test
> >                                                          >      >
> >                                                          >
>  connectivity
> >                                                          >      >
> >                                                          >      >
> >                                                               on a
> specific
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           VNI? I would
> >                                                         not pick a
> >                                                          >     loopback
> IP
> >                                                          >      >
> >                                                          >     address
> for
> >                                                          >      >
> >                                                          >      >
> >                                                               this sinc=
e
> >                                                         that
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           address range
> >                                                         is host/node
> local
> >                                                          >      >
> >                                                           only. Is
> >                                                          >      >
> >                                                          >     there a
> >                                                          >      >
> >                                                          >      >
> >                                                               reason
> you're
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           not using the
> >                                                         VTEP IP as the
> >                                                          >     inner IP
> >                                                          >      >
> >                                                          >     address =
?
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           Dinesh
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           On Wed, Jul
> >                                                         31, 2019 at 5:4=
8
> AM
> >                                                          >      >
> >                                                           Greg Mirsky
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                           <
> gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >
> >                                                          >      >
> >                                                            gregimirsky@gmail.com   gregimirsky@gmail.com >>
> >                                                          >      >
> >                                                          >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >  gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >>>
> >                                                          >      >
> >                                                          >      >
> >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >
> >                                                          >      >
> >                                                            gregimirsky@gmail.com   gregimirsky@gmail.com >>
> >                                                          >      >
> >                                                          >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >
> >                                                          >      >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >>>>  gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >
> >                                                          >      >
> >                                                            gregimirsky@gmail.com   gregimirsky@gmail.com >>
> >                                                          >      >
> >                                                          >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >  gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >>>
> >                                                          >      >
> >                                                          >      >
> >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >
> >                                                          >      >
> >                                                            gregimirsky@gmail.com   gregimirsky@gmail.com >>
> >                                                          >      >
> >                                                          >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >
> >                                                          >      >
> >                                                            gregimirsky@gmail.com 
> >                                                          >
> >                                                            gregimirsky@gmail.com >>>>>> wrote:
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               Dear All,
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               thank you
> >                                                         for your
> comments,
> >                                                          >      >
> >                                                          >
> >                                                           suggestions o=
n
> >                                                          >      >
> >                                                          >      >
> >                                                               this issu=
e,
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               probably
> >                                                         the most
> >                                                          >
>  challenging
> >                                                          >      >
> >                                                           for this
> >                                                          >      >
> >                                                          >      >
> >
> >                                                           specification=
.
> >                                                         In the
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               course of
> >                                                         our discussions=
,
> >                                                          >      >
> >                                                           we've agreed =
to
> >                                                          >      >
> >                                                          >      >
> >                                                               abandon t=
he
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               request t=
o
> >                                                         allocate the
> >                                                          >      >
> >                                                           dedicated MAC
> >                                                          >      >
> >                                                          >     address
> >                                                          >      >
> >                                                          >      >
> >                                                               to be use=
d
> as
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               the
> >                                                         destination MAC
> >                                                          >     address =
in
> >                                                          >      >
> >                                                           the inner
> >                                                          >      >
> >                                                          >      >
> >                                                               Ethernet
> >                                                         frame.
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               Also,
> >                                                         earlier using V=
NI
> >                                                          >     0 was
> >                                                          >      >
> >                                                           changed from
> >                                                          >      >
> >                                                          >      >
> >                                                               mandatory
> >                                                         to one
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               of the
> >                                                         options an
> >                                                          >      >
> >                                                           implementatio=
n
> may
> >                                                          >      >
> >                                                          >     offer to
> >                                                          >      >
> >                                                          >      >
> >                                                               an
> operator.
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               The most
> >                                                         recent
> >                                                          >
> >                                                           discussion wa=
s
> >                                                          >      >
> >                                                           whether
> >                                                          >      >
> >                                                          >     VTEP's
> >                                                          >      >
> >                                                          >      >
> >                                                               MAC addre=
ss
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               might be
> >                                                         used as the
> >                                                          >      >
> >                                                           destination M=
AC
> >                                                          >      >
> >                                                          >     address
> >                                                          >      >
> >                                                          >      >
> >                                                               in the
> inner
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               Ethernet
> >                                                         frame. As I
> >                                                          >     recall
> >                                                         it, the
> >                                                          >      >
> >                                                          >     comments
> >                                                          >      >
> >                                                          >      >
> >                                                               from VXLA=
N
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               experts
> >                                                         equally split
> >                                                          >     with one
> >                                                          >      >
>  for it
> >                                                          >      >
> >                                                          >     and one
> >                                                          >      >
> >                                                          >      >
> >                                                               against.
> Hence
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               I would
> >                                                         like to propose
> >                                                          >     a new
> >                                                          >      >
> >                                                           text to
> >                                                          >      >
> >                                                          >     resolve
> >                                                          >      >
> >                                                          >      >
> >                                                               the issue=
.
> The
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               idea is t=
o
> >                                                         let an
> >                                                          >     operator
> >                                                         select
> >                                                          >      >
> >                                                          >     Manageme=
nt
> >                                                          >      >
> >                                                          >      >
> >                                                               VNI and u=
se
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               that VNI
> >                                                         in VXLAN
> >                                                          >
>  encapsulation
> >                                                          >      >     o=
f
> BFD
> >                                                          >      >
> >                                                          >      >
> >                                                               Control
> >                                                         packets:
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               NEW TEXT:
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                                   An
> >                                                         operator MUST
> >                                                          >     select a
> VNI
> >                                                          >      >
> >                                                          >     number t=
o
> >                                                          >      >
> >                                                          >      >
> >                                                               be used a=
s
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >
> >                                                           Management
> >                                                         VNI. VXLAN
> >                                                          >      >
> >                                                           packet for
> >                                                          >      >
> >                                                          >      >
> >                                                               Managemen=
t
> >                                                         VNI MUST NOT
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                                   be
> >                                                         sent to a
> >                                                         tenant. VNI
> >                                                          >      >
> >                                                           number 1 is
> >                                                          >      >
> >                                                          >      >
> >
> >                                                           RECOMMENDED a=
s
> the
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >
> >                                                           default for
> >                                                          >
> >                                                           Management VN=
I.
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               With that
> >                                                         new text, what
> >                                                          >     can be t=
he
> >                                                          >      >
> >                                                          >     value of
> >                                                          >      >
> >                                                          >      >
> >                                                               the
> >                                                         destination
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               MAC in th=
e
> >                                                         inner Ethernet?=
 I
> >                                                          >      >
> >                                                           tend to
> >                                                          >      >
> >                                                          >     believe
> >                                                          >      >
> >                                                          >      >
> >                                                               that it
> can be
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               anything
> >                                                         and ignored by
> the
> >                                                          >      >
> >                                                           reciever VTEP=
.
> >                                                          >      >
> >                                                          >      >
> >                                                               Also, if
> the
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               trapping
> >                                                         is based on VNI
> >                                                          >      >
> >                                                           number, the
> >                                                          >      >
> >                                                          >      >
> >
> >                                                           destination I=
P
> >                                                         address
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               of the
> >                                                         inner IP packet
> >                                                          >     can from
> >                                                          >      >
> >                                                           the range
> >                                                          >      >
> >                                                          >      >
> >                                                               127/8 for
> >                                                         IPv4,
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               and for
> >                                                         IPv6 from the
> range
> >                                                          >      >
> >                                                          >      >
> >
> >
>  0:0:0:0:0:FFFF:7F00:0/104. And
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               lastly,
> >                                                         the TTL to be
> >                                                          >     set to 1
> (no
> >                                                          >      >
> >                                                          >     change
> here).
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               Much
> >                                                         appreciate your
> >                                                          >     comments=
,
> >                                                          >      >
> >                                                          >
> >                                                           questions, an=
d
> >                                                          >      >
> >                                                          >      >
> >
>  suggestions.
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               Best
> regards,
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                               Greg
> >                                                          >      >
> >                                                          >      >
> >                                                                >
> >                                                          >      >
> >                                                          >      >
> >                                                          >      >      =
>
> >                                                          >      >
> >                                                          >
> >
> >
>
> _______________________________________________
> nvo3 mailing list
> nvo3@ietf.org
> https://www.ietf.org/mailman/listinfo/nvo3
>

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From nobody Thu Oct  3 12:34:23 2019
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From: Jeffrey Haas 
To: "Albert Fu (BLOOMBERG/ 120 PARK)" 
Cc: jhaas@juniper.net, robert@raszuk.net, rtg-bfd@ietf.org
Subject: Re: Rtg-bfd Digest, Vol 163, Issue 25
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On Tue, Oct 01, 2019 at 11:11:13PM -0000, Albert Fu (BLOOMBERG/ 120 PARK) wrote:
> There are well known cases, including those you mentioned, where BFD has
> limitations in deterministically detecting data plane issue, and not
> specific with the BFD Large Packet Draft. I am a novice to the IETF
> process, and not sure if we need to mention them here, but shall discuss
> with Jeff if it is worth highlighting them.

It's reasonable to make note of issues where common operational scenarios
will complicate the solution.  But it's not up to a draft carried on top of
an RFC with that core issue to try to solve the issue in that core RFC.

So, trying to solve "BFD doesn't work perfectly in the presence of LAGs" in
bfd-large is the wrong place to do it. :-)

That said, Robert, there's room for you to work on that if you want to kick
off a draft on the topic. 

> > We won't have control over how the Provider maps our traffic (BFD/data).  
> 
> > Well of course you do :)  Just imagine if your BFD packets (in set equal to configured multiplier) would start 
> > using random UDP source port which then would be mapped to different ECMP buckets along the way in provider's
> > underlay ? 

And that's an example of possible solution space for such a draft on the
underlying issue.

That said, LAG fan-out issues are a massive operational pain.  While it's
likely that varying L3 PDU fields for entropy to distribute traffic across
the LAG may work (and we have any number of customers who rely on this for
UDP especially), it starts getting very problematic when you have multiple
LAGs in a path.  I have a vague memory that someone had started some
discussions with IEEE to try to figure out what OAM mechanisms would look
like for such scenarios, but that's very much out of normal BFD scope.

-- Jeff


From nobody Thu Oct  3 13:10:03 2019
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Date: Thu, 3 Oct 2019 16:12:53 -0400
From: Jeffrey Haas 
To: "Les Ginsberg (ginsberg)" 
Cc: "Ketan Talaulikar (ketant)" , "Reshad Rahman (rrahman)" , "rtg-bfd@ietf.org" 
Subject: Re: WGLC for draft-ietf-bfd-large-packets
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Les,

On Fri, Sep 27, 2019 at 09:14:08PM +0000, Les Ginsberg (ginsberg) wrote:
> > The primary reason this is a "may" in the non-RFC 2119 sense is that our
> > experience also suggests that when the scaling impacts are primarily pps
> > rather than bps that this feature will likely have no major impact on
> > implementations beyond your valid concerns about exercising bugs.
> > 
> > I suspect had this not been mentioned at all, you would have been happier.
> > But you're not the target audience for this weak caveat.
> > 
> 
> [Les:] I am not opposed to a discussion of potential issues in the draft -
> rather I am encouraging it. But the current text isn't really on the mark
> as far as potential issues - and we seem to agree on that. It also
> suggests lengthening detection time to compensate - which I think is not
> at all what you want to suggest as it diminishes the value of the
> extension. It also isn't likely to address a real problem.

I think what I'm seeing from you is roughly:
- Note that larger MTUs may have impact on some implementations for BFD
  throughput.
- And simply stop there.

> For me, the potential issues are:
> 
> a)Some BFD implementations might not be able to handle MTU sized BFD
> packets - not because of performance - but because they did not expect BFD
> packets to be full size and therefore might have issues passing a large
> packet through the local processing engine.

In such cases, the BFD session wouldn't be able to come up.  Are you
picturing a problem more dire than that?

> b)Accepted MTU is impacted by encapsulations and what layer is being
> considered (L2 or L3). And oftentimes link MTUs do not match on both ends
> ("shudder"), so you might end up with unidirectional connectivity.

Did you mean for BFD or more in the general sense?

For BFD, if you have one side testing for large MTU but not the other, we
can still have a Up BFD session with possible packet drop for large packets
on the opposite side.  But there's the chance in some paths that MTU may be
unidirectionally different - e.g. satellite down vs. land up.[1]

In such cases, configuring BFD large on both sides would be the right
answer.  But it's also possible that large packets may only need to be
unidirectionally delivered.

> I
> appreciate that this is exactly the problem that the extensions are
> designed to detect. I am just asking that these issues be discussed more
> explicitly as an aid to the implementor. If that also makes Transports ADs
> happier that is a side benefit - but that's not my motivation.

We're happy to have that in the document.

> > > What might be better?
> > >
> > > 1)Some statement that MTU isn't necessarily a consistent value for all
> > > systems connected to an interface - which can impact the results when large
> > > BFD packets are used. Implementations might then want to consider
> > > supporting "bfd-mtu" configuration and/or iterating across a range of packet
> > > sizes to determine what works and what doesn't.
> > 
> > I'm not clear what you intend by this statement.
> > 
> > Are you asking that we emphasize the use case in a different way?  The
> > Introduction currently states:
> >   "However,
> >    some applications may require that the Path MTU [RFC1191] between
> >    those two systems meets a certain minimum criteria.  When the Path
> >    MTU decreases below the minimum threshold, those applications may
> >    wish to consider the path unusable."
> > 
> > I'm also unclear what "Implementations" may refer to here.  BFD?  An
> > arbitrary user application?  If the latter, the application may not have
> > strict control over the generation of a given PDU size; e.g. TCP
> > applications.
> > 
> 
> [Les:] I am talking about BFD implementations.
> I suppose one can imagine each BFD client requesting a certain MTU value -
> but that wouldn't be my choice.

BFD conversations happen between pairs of devices.  In the case that you
have multiple devices connected to a network segment, each conversation
could (and may intentionally) have different properties.  

An easy example of this is two devices running an IGP may want fast failure
and two other devices running BGP may be happy with just under second-level
failure.  So too could some device decide that it cares about bi-directional
path MTU while the others may not.

Given prior BFD documents' lack of discussion about such multi-access
network considerations, I'm not sure it's in character to have it just for
such a case, if that's what you're concerned with.

> I would think the value we want is really the maximum L3 payload that the
> link is intended to support - which should be independent of the BFD
> client. This might be larger than any client actually uses - but that
> seems like a good thing.

In this case we have actual existence proof of desired behavior.  The links
may be 9k but the user cares only about 1500 bytes end to end. If 1500 bytes
for BFD large works but 9k doesn't, we've not tested what the user actually
desired.

-- Jeff


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From: Robert Raszuk 
Date: Thu, 3 Oct 2019 22:10:32 +0200
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Hi Jeff,

> That said, Robert, there's room for you to work on that if you want to
kick
> off a draft on the topic.

Thx for the hint, but I do not think this extension should be done in BFD
for three reasons:

Reason 1 -

BFD works well to quickly detect failures. Loading on it more stuff
compromises it. Moreover other vendors already have shipping tools which
already can detect issues due to changes in MTU of the paths: Example:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/xe-16-6/sla-xe-16-6-book/sla-icmp-pathecho.html

Reason 2 -

As the draft states that the idea is to automate use of this extension by
client protocols. I do not agree with such deployment model of this
enhancement. At most if frequency of MTU probing would be 100-1000 times
less frequent then up/down link detection it would serve its purpose - yet
there is no word in the draft about such option. Essentially instead of
replacing current tiny BFD packets one could use bfd-large as different
sessions with completely different timers. Maybe even end to end instead of
link by link.

Reason 3 -

As we know BFD is very often used between ASes. How do you signal over p2p
link willingness to now encapsulate BFD in stuffed UDP ? Email ? Phone ?
Text ? Note that with mentioned icmp pathecho I can seamlessly detect issue
with MTU of the link to my peer without telling anyone or asking for
support of the other side.

Thx,
Robert.

On Thu, Oct 3, 2019 at 9:34 PM Jeffrey Haas  wrote:

> On Tue, Oct 01, 2019 at 11:11:13PM -0000, Albert Fu (BLOOMBERG/ 120 PARK)
> wrote:
> > There are well known cases, including those you mentioned, where BFD has
> > limitations in deterministically detecting data plane issue, and not
> > specific with the BFD Large Packet Draft. I am a novice to the IETF
> > process, and not sure if we need to mention them here, but shall discuss
> > with Jeff if it is worth highlighting them.
>
> It's reasonable to make note of issues where common operational scenarios
> will complicate the solution.  But it's not up to a draft carried on top of
> an RFC with that core issue to try to solve the issue in that core RFC.
>
> So, trying to solve "BFD doesn't work perfectly in the presence of LAGs" in
> bfd-large is the wrong place to do it. :-)
>
> That said, Robert, there's room for you to work on that if you want to kick
> off a draft on the topic.
>
> > > We won't have control over how the Provider maps our traffic
> (BFD/data).
> >
> > > Well of course you do :)  Just imagine if your BFD packets (in set
> equal to configured multiplier) would start
> > > using random UDP source port which then would be mapped to different
> ECMP buckets along the way in provider's
> > > underlay ?
>
> And that's an example of possible solution space for such a draft on the
> underlying issue.
>
> That said, LAG fan-out issues are a massive operational pain.  While it's
> likely that varying L3 PDU fields for entropy to distribute traffic across
> the LAG may work (and we have any number of customers who rely on this for
> UDP especially), it starts getting very problematic when you have multiple
> LAGs in a path.  I have a vague memory that someone had started some
> discussions with IEEE to try to figure out what OAM mechanisms would look
> like for such scenarios, but that's very much out of normal BFD scope.
>
> -- Jeff
>

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Hi Jeff,

> That said, Robert, there&=
#39;s room for you to work on that if you want to kick
> off a draft =
on the topic.=C2=A0=C2=A0

Thx for the hint, bu=
t I do not think this extension should be done in BFD for three reasons:

Reason 1 -=C2=A0

BFD works =
well to quickly detect failures. Loading on it more stuff compromises it. M=
oreover other vendors already have shipping tools which already can detect =
issues due to changes in MTU of the paths: Example:=C2=A0https://www.cisco.com/c/en/us/td/docs/=
ios-xml/ios/ipsla/configuration/xe-16-6/sla-xe-16-6-book/sla-icmp-pathecho.=
html

Reason 2 -=C2=A0

As the draft states that the idea is to automate use of this extension by =
client protocols. I do not agree with such deployment model of this enhance=
ment. At most if frequency of MTU probing would be 100-1000 times less freq=
uent then up/down link detection it would serve its purpose - yet there is =
no word in the draft about such option. Essentially instead of replacing cu=
rrent tiny BFD packets one could use bfd-large as different sessions with c=
ompletely different timers. Maybe even end to end instead of link by link.=
=C2=A0

Reason 3 -=C2=A0

A=
s we know BFD is very often used between ASes. How do you signal over p2p l=
ink willingness to now encapsulate BFD in stuffed UDP ? Email ? Phone ? Tex=
t ? Note that with mentioned icmp pathecho=C2=A0I can seamlessly detect iss=
ue with MTU of the link to my peer without telling anyone or asking for sup=
port of the other side.=C2=A0

Thx,
Rober=
t.

On Thu, Oct 3, 2019 at 9:34 PM Jeffrey Haas <jhaas@pfrc.org> wrote:
On Tue, Oct 01, 2019 at 11:11:13PM -0000, Albe=
rt Fu (BLOOMBERG/ 120 PARK) wrote:

> There are well known cases, including those you mentioned, where BFD h=
as

> limitations in deterministically detecting data plane issue, and not
> specific with the BFD Large Packet Draft. I am a novice to the IETF
> process, and not sure if we need to mention them here, but shall discu=
ss

> with Jeff if it is worth highlighting them.



It's reasonable to make note of issues where common operational scenari=
os

will complicate the solution.=C2=A0 But it's not up to a draft carried =
on top of

an RFC with that core issue to try to solve the issue in that core RFC.



So, trying to solve "BFD doesn't work perfectly in the presence of=
 LAGs" in

bfd-large is the wrong place to do it. :-)



That said, Robert, there's room for you to work on that if you want to =
kick

off a draft on the topic. 



> > We won't have control over how the Provider maps our traffic =
(BFD/data).=C2=A0 

> 

> > Well of course you do :)=C2=A0 Just imagine if your BFD packets (=
in set equal to configured multiplier) would start 

> > using random UDP source port which then would be mapped to differ=
ent ECMP buckets along the way in provider's

> > underlay ? 



And that's an example of possible solution space for such a draft on th=
e

underlying issue.



That said, LAG fan-out issues are a massive operational pain.=C2=A0 While i=
t's

likely that varying L3 PDU fields for entropy to distribute traffic across<=
br>
the LAG may work (and we have any number of customers who rely on this for<=
br>
UDP especially), it starts getting very problematic when you have multiple<=
br>
LAGs in a path.=C2=A0 I have a vague memory that someone had started some
discussions with IEEE to try to figure out what OAM mechanisms would look
like for such scenarios, but that's very much out of normal BFD scope.<=
br>


-- Jeff




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From: "Les Ginsberg (ginsberg)" 
To: Jeffrey Haas 
CC: "Ketan Talaulikar (ketant)" , "Reshad Rahman (rrahman)" , "rtg-bfd@ietf.org" 
Subject: RE: WGLC for draft-ietf-bfd-large-packets
Thread-Topic: WGLC for draft-ietf-bfd-large-packets
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Date: Fri, 4 Oct 2019 00:02:04 +0000
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X-List-Received-Date: Fri, 04 Oct 2019 00:02:12 -0000

Jeff -

For some reason this is proving to be harder than I think it should be.

I keep thinking I am being transparent - yet you keep reading "ulterior mot=
ives" into what I say.
There are no ulterior motives.

Let me try again...inline...

> -----Original Message-----
> From: Jeffrey Haas 
> Sent: Thursday, October 03, 2019 1:13 PM
> To: Les Ginsberg (ginsberg) 
> Cc: Ketan Talaulikar (ketant) ; Reshad Rahman
> (rrahman) ; rtg-bfd@ietf.org
> Subject: Re: WGLC for draft-ietf-bfd-large-packets
>=20
> Les,
>=20
> On Fri, Sep 27, 2019 at 09:14:08PM +0000, Les Ginsberg (ginsberg) wrote:
> > > The primary reason this is a "may" in the non-RFC 2119 sense is that =
our
> > > experience also suggests that when the scaling impacts are primarily =
pps
> > > rather than bps that this feature will likely have no major impact on
> > > implementations beyond your valid concerns about exercising bugs.
> > >
> > > I suspect had this not been mentioned at all, you would have been
> happier.
> > > But you're not the target audience for this weak caveat.
> > >
> >
> > [Les:] I am not opposed to a discussion of potential issues in the draf=
t -
> > rather I am encouraging it. But the current text isn't really on the ma=
rk
> > as far as potential issues - and we seem to agree on that. It also
> > suggests lengthening detection time to compensate - which I think is no=
t
> > at all what you want to suggest as it diminishes the value of the
> > extension. It also isn't likely to address a real problem.
>=20
> I think what I'm seeing from you is roughly:
> - Note that larger MTUs may have impact on some implementations for BFD
>   throughput.
> - And simply stop there.
>=20
[Les:] What I would like to see discussed are points "a" and "b" below.
This is a section on deployment issues - not a normative part of the spec.

> > For me, the potential issues are:
> >
> > a)Some BFD implementations might not be able to handle MTU sized BFD
> > packets - not because of performance - but because they did not expect
> BFD
> > packets to be full size and therefore might have issues passing a large
> > packet through the local processing engine.
>=20
> In such cases, the BFD session wouldn't be able to come up.  Are you
> picturing a problem more dire than that?
>=20

[Les:] No. Again, as this is a discussion of deployment considerations I se=
e this as an aid to indicate what problems may be seen.
I am not asking you to "fix" the extension to overcome this.

> > b)Accepted MTU is impacted by encapsulations and what layer is being
> > considered (L2 or L3). And oftentimes link MTUs do not match on both
> ends
> > ("shudder"), so you might end up with unidirectional connectivity.
>=20
> Did you mean for BFD or more in the general sense?

[Les:] It is a problem in the general sense, but it is relevant here becaus=
e the extension proposes to send large packets. Absent that, MTU mismatches=
 would be very unlikely to affect BFD since the BFD packet size is small.

>=20
> For BFD, if you have one side testing for large MTU but not the other, we
> can still have a Up BFD session with possible packet drop for large packe=
ts
> on the opposite side.  But there's the chance in some paths that MTU may =
be
> unidirectionally different - e.g. satellite down vs. land up.[1]
>=20
In such cases, configuring BFD large on both sides would be the right
> answer.  But it's also possible that large packets may only need to be
> unidirectionally delivered.
>=20

[Les:] I agree - and I think it is valid to use the extension unidirectiona=
lly in such cases.

>
> > I
> > appreciate that this is exactly the problem that the extensions are
> > designed to detect. I am just asking that these issues be discussed mor=
e
> > explicitly as an aid to the implementor. If that also makes Transports =
ADs
> > happier that is a side benefit - but that's not my motivation.
>=20
> We're happy to have that in the document.
>=20

[Les:] Great!!

> > > > What might be better?
> > > >
> > > > 1)Some statement that MTU isn't necessarily a consistent value for =
all
> > > > systems connected to an interface - which can impact the results wh=
en
> large
> > > > BFD packets are used. Implementations might then want to consider
> > > > supporting "bfd-mtu" configuration and/or iterating across a range =
of
> packet
> > > > sizes to determine what works and what doesn't.
> > >
> > > I'm not clear what you intend by this statement.
> > >
> > > Are you asking that we emphasize the use case in a different way?  Th=
e
> > > Introduction currently states:
> > >   "However,
> > >    some applications may require that the Path MTU [RFC1191] between
> > >    those two systems meets a certain minimum criteria.  When the Path
> > >    MTU decreases below the minimum threshold, those applications may
> > >    wish to consider the path unusable."
> > >
> > > I'm also unclear what "Implementations" may refer to here.  BFD?  An
> > > arbitrary user application?  If the latter, the application may not h=
ave
> > > strict control over the generation of a given PDU size; e.g. TCP
> > > applications.
> > >
> >
> > [Les:] I am talking about BFD implementations.
> > I suppose one can imagine each BFD client requesting a certain MTU valu=
e -
> > but that wouldn't be my choice.
>=20
> BFD conversations happen between pairs of devices.  In the case that you
> have multiple devices connected to a network segment, each conversation
> could (and may intentionally) have different properties.
>=20
> An easy example of this is two devices running an IGP may want fast failu=
re
> and two other devices running BGP may be happy with just under second-
> level
> failure.
>  So too could some device decide that it cares about bi-directional
> path MTU while the others may not.
>=20

[Les:] I agree. My point was BFD sessions are requested by clients (such as=
 a routing protocol). That client may/may not care about MTU e.g., a routin=
g protocol may not use MTU sized packets.
But if the goal is to validate that MTU sized data traffic can successfully=
 be sent then "someone" has to enable that. And I would argue that the most=
 logical place to enable the feature is under BFD itself since a routing pr=
otocol (BGP/OSPF) won't necessarily care about MTU.
Since you are speaking at the "device" level (not BFD client level) I think=
 we are in agreement.

> Given prior BFD documents' lack of discussion about such multi-access
> network considerations, I'm not sure it's in character to have it just fo=
r
> such a case, if that's what you're concerned with.
>=20
> > I would think the value we want is really the maximum L3 payload that t=
he
> > link is intended to support - which should be independent of the BFD
> > client. This might be larger than any client actually uses - but that
> > seems like a good thing.
>=20
> In this case we have actual existence proof of desired behavior.  The lin=
ks
> may be 9k but the user cares only about 1500 bytes end to end. If 1500 by=
tes
> for BFD large works but 9k doesn't, we've not tested what the user actual=
ly
> desired.

[Les:] This is fine. This is consistent with my suggestion that an implemen=
tation supports a "bfd-mtu" knob. This value can be <=3D link_mtu.

    Les

>=20
> -- Jeff


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From: Anoop Ghanwani 
Date: Mon, 7 Oct 2019 21:15:04 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: xiao.min2@zte.com.cn
Cc: Greg Mirsky , didutt@gmail.com, draft-ietf-bfd-vxlan@ietf.org,  nvo3@ietf.org, santosh.pallagatti@gmail.com, rtg-bfd WG ,  "Joel M. Halpern" , tsridhar@vmware.com
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Hi Xiao Min,

Is there a draft that describes MPLS over Geneve?  It sounds like the NVE
is an MPLS router in this case and if you're using the same VNI as you
switch MPLS, then it's a one-armed router.  That doesn't change how BFD
needs to be run between NVEs.

Anoop

On Mon, Oct 7, 2019 at 7:28 PM  wrote:

> Hi Anoop,
>
>
> Sorry for the late response, I just come back from vacation.
>
> The use case is that the network between the VM and the NVE is an MPLS
> network, within which the packet is forwarded basing on MPLS label, but n=
ot
> Ethernet MAC address and/or 802.1Q VLAN. When two such kind of MPLS
> networks need to communicate with each other, through a Geneve tunnel, th=
e
> encap I illustrated would be used.
>
>
> Best Regards,
>
> Xiao Min
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky =
;didutt@gmail.com <
> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
> santosh.pallagatti@gmail.com ;rtg-bfd WG <
> rtg-bfd@ietf.org>;Joel M. Halpern ;
> tsridhar@vmware.com ;
> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8828=E6=97=A5 05:36
> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD C=
ontrol packet at VTEP*
> Hi Xiao Min,
>
> Thanks for the details about the encap but the use case is not clear.  It
> might help if you explain why its necessary to map a physical Ethernet po=
rt
> and/or 802.1Q VLAN to the same VNI as an MPLS packet without an L2 header=
.
>
> Thanks,
> Anoop
>
> On Thu, Sep 26, 2019 at 7:50 PM  wrote:
>
>> Hi Anoop,
>>
>>
>> Due to the fact that a variety of Tunnels could be used under the NVO3 a=
rchitecture,
>> as an example, below figure illustrates the format of MPLS packet over
>> Geneve Tunnel.
>>
>>     0                   1                   2                   3
>>     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>    |                                                               |
>>    ~                      Outer Ethernet Header                    ~
>>    |                                                               |
>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>    |                                                               |
>>    ~                        Outer IPvX Header                      ~
>>    |                                                               |
>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>    |                                                               |
>>    ~                        Outer UDP Header                       ~
>>    |                                                               |
>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>    |                                                               |
>>    ~                          Geneve Header                        ~
>>    |                                                               |
>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
>>    |                                                               |  |
>>    ~                         MPLS Label Stack                      ~  M
>>    |                                                               |  P
>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  L
>>    |                                                               |  S
>>    |                                                               |
>>    ~                             Payload                           ~  P
>>    |                                                               |  K
>>    |                                                               |  T
>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
>>    |                               FCS                             |
>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>
>>
>> Note that in NVO3 working group Greg and I have submitted an individual
>> draft draft-xiao-nvo3-bfd-geneve, which is used to address BFD over Gene=
ve.
>>
>> The intention is to make the two drafts draft-ietf-bfd-vxlan and
>> draft-xiao-nvo3-bfd-geneve aligned, that is to say, we try to define the
>> identical mechanism for the common part of BFD over VxLAN Tunnel and BFD
>> over Geneve Tunnel. For the common part, draft-xiao-nvo3-bfd-geneve woul=
d
>> reference to draft-ietf-bfd-vxlan, and for the other part specific to
>> Geneve, we'll define the specific mechanism in draft-xiao-nvo3-bfd-genev=
e.
>>
>>
>> Hope that clarifies.
>>
>>
>> Best Regards,
>>
>> Xiao Min
>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>> santosh.pallagatti@gmail.com ;rtg-bfd WG <
>> rtg-bfd@ietf.org>;Joel M. Halpern ;
>> tsridhar@vmware.com ;bfd-chairs@ietf.org <
>> bfd-chairs@ietf.org>;
>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5 23:16
>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD =
Control packet at VTEP*
>> Hi Xiao Min,
>> I think we would need more detail around the use case below.  What does
>> the MPLS packet over Tunnel look like?
>>
>> Thanks,
>> Anoop
>>
>> On Wed, Sep 25, 2019 at 11:37 PM  wrote:
>>
>>> Hi Anoop,
>>>
>>>
>>> Thanks for your comments.
>>>
>>> Considering a scenario where TS1 has an MPLS access (i.e. MPLS-Packet
>>> over Tunnel between NVEs) to VNI1, TS3 has an Ethernet access (i.e.
>>> MAC-Frame over Tunnel between NVEs) to VNI1, then how can TS1 and TS3 s=
hare
>>> one VAP?
>>>
>>>
>>> Best Regards,
>>>
>>> Xiao Min
>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>> santosh.pallagatti@gmail.com ;rtg-bfd WG =
<
>>> rtg-bfd@ietf.org>;Joel M. Halpern ;
>>> tsridhar@vmware.com ;bfd-chairs@ietf.org <
>>> bfd-chairs@ietf.org>;
>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5 08:3=
6
>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD=
 Control packet at VTEP*
>>> _______________________________________________
>>> nvo3 mailing list
>>> nvo3@ietf.org
>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>
>>> >>>
>>> Some people may argue that all Tenant Systems connecting to the same
>>> Virtual Network MUST share one VAP, if that's true, then VAP1 and VAP3
>>> should merge into one VAP and my explanation doesn't work. Copying to N=
VO3
>>> WG to involve more experts, hope for your clarifications and comments.
>>> >>>
>>>
>>> I would be one of those that would argue that they MUST share on VAP if
>>> they connect to the same Virtual Network.  IMO, the NVO3 arch doc shoul=
d
>>> have been clearer about this.
>>>
>>> Thanks,
>>> Anoop
>>>
>>> On Tue, Sep 24, 2019 at 7:40 PM  wrote:
>>>
>>>> Hi Santosh,
>>>>
>>>>
>>>> With regard to the question whether we should allow multiple BFD
>>>> sessions for the same VNI or not, IMHO we should allow it, more explan=
ation
>>>> as follows...
>>>>
>>>> Below is a figure derived from figure 2 of RFC8014 (An Architecture
>>>> for Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>
>>>>                     |         Data Center Network (IP)        |
>>>>                     |                                         |
>>>>                     +-----------------------------------------+
>>>>                          |                           |
>>>>                          |       Tunnel Overlay      |
>>>>             +------------+---------+       +---------+------------+
>>>>             | +----------+-------+ |       | +-------+----------+ |
>>>>             | |  Overlay Module  | |       | |  Overlay Module  | |
>>>>             | +---------+--------+ |       | +---------+--------+ |
>>>>             |           |          |       |           |          |
>>>>      NVE1   |           |          |       |           |          | NV=
E2
>>>>             |  +--------+-------+  |       |  +--------+-------+  |
>>>>             |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
>>>>             |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
>>>>             |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
>>>>             +----+-----+----+------+       +----+-----+-----+-----+
>>>>                  |     |    |                   |     |     |
>>>>                  |     |    |                   |     |     |
>>>>                  |     |    |                   |     |     |
>>>>           -------+-----+----+-------------------+-----+-----+-------
>>>>                  |     |    |     Tenant        |     |     |
>>>>             TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>                 |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>
>>>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>> actually initiated and terminated at VAP of NVE.
>>>>
>>>> If the network operator want to set up one BFD session between VAP1 of
>>>> NVE1 and VAP1of NVE2, at the same time another BFD session between VAP=
3 of
>>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same
>>>> VNI1, I believe it's reasonable, so that's why I think we should allow
>>>> it.
>>>>
>>>>
>>>> Of course, in RFC8014 it also says:
>>>>
>>>> "Note that two different Tenant Systems (and TSIs) attached to a commo=
n NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as they conne=
ct to the same Virtual Network."
>>>>
>>>> Some people may argue that all Tenant Systems connecting to the same
>>>> Virtual Network MUST share one VAP, if that's true, then VAP1 and VAP3
>>>> should merge into one VAP and my explanation doesn't work. Copying to =
NVO3
>>>> WG to involve more experts, hope for your clarifications and comments.
>>>>
>>>>
>>>> Best Regards,
>>>>
>>>> Xiao Min
>>>>
>>>
>>>
>>
>

--00000000000066175605945e6a32
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Xiao Min,

Is there =
a draft that describes MPLS over Geneve?=C2=A0 It sounds like the NVE is an=
 MPLS router in this case and if you're using the same VNI as you switc=
h MPLS, then it's a one-armed router.=C2=A0 That doesn't change how=
 BFD needs to be run between NVEs.

Anoop

On M=
on, Oct 7, 2019 at 7:28 PM <xiao=
.min2@zte.com.cn> wrote:
Hi Anoop=
,

Sorry for the late response, I just come back=
 from vacation.
The use ca=
se is that the network between the VM and the NVE is an MPLS network, withi=
n which the packet is forwarded basing on MPLS label, but not Ethernet MAC =
address and/or 802.1Q VLAN. When two such kind of MPLS networks need to com=
municate with each other, through a Geneve tunnel, the encap I illustrated =
would be used.

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=
=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu><=
/div>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=
=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=9C=8828=E6=97=A5 05:36
=E4=B8=BB =E9=A2=98 =EF=BC=9A=
Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
Hi Xi=
ao Min,

Thanks for the details about the encap but the u=
se case is not clear.=C2=A0 It might help if you explain why its necessary =
to map a physical Ethernet port and/or 802.1Q VLAN to the same VNI as an MP=
LS packet without an L2 header.

Thanks,
=
Anoop

On Thu, Sep 26, 2019 at 7:50 PM <xiao.min2@zte.com.cn> wrote:
=

Hi Anoop,

Due to the =
fact that=C2=A0a variety of Tunnels could be used under the NVO3 architecture, as an example, below figure=
 illustrates the format of MPLS packet over Geneve Tunnel.
    0                   1                   2   =
                3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                      Outer Ethernet Header                    ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer IPvX Header                      ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer UDP Header                       ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                          Geneve Header                        ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                                                               |  |
   ~                         MPLS Label Stack                      ~  M
   |                                                               |  P
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  L
   |                                                               |  S
   |                                                               |
   ~                             Payload                           ~  P
   |                                                               |  K
   |                                                               |  T
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                               FCS                             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
<=
p style=3D"font-size:14px;font-family:arial">

Note that in NVO3 working group Greg=
 and I have submitted an individual draft draft-xiao-nvo3-bfd-geneve, which=
 is used to address BFD over Geneve.
The intention is to make the two=
 drafts draft-ietf-bfd-vxlan and draft-xiao-nvo3-bfd-geneve aligned, that i=
s to say, we try to define the identical mechanism for the common part of B=
FD over VxLAN Tunnel and BFD over Geneve Tunnel. For the common part, draft=
-xiao-nvo3-bfd-geneve would reference to draft-ietf-bfd-vxlan, and for the =
other part specific to Geneve, we'll define the specific mechanism in d=
raft-xiao-nvo3-bfd-geneve.

Hope that clarifies.

=

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=
=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=
=9AAnoopGhanwani <anoop@alumni.duke.edu>
=
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=
=B409=E6=9C=8826=E6=97=A5 23:16
=E4=B8=BB =E9=A2=98 =EF=
=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD Contro=
l packet at VTEP
Hi Xiao Min,
I think we would need more detail around =
the use case below.=C2=A0 What does the MPLS packet over Tunnel look like?<=
/div>
Thanks,
Anoop

On Wed, Sep 25, 2019 at 11:37 PM=
 <xiao.min2@zt=
e.com.cn> wrote:
Hi Anoop,

Thanks for your comments.
Considering a scenario where TS1 has an MPLS access (=
i.e. MPLS-Packet over Tunnel between NVEs) to VNI1, TS3 has an Ethernet acc=
ess (i.e. MAC-Frame over Tunnel between NVEs) to VNI1, then how can TS1 and=
 TS3 share one VAP?

Best Regards,
Xiao Min
=E5=8E=9F=E5=
=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.ed=
u>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=
=9F =EF=BC=9A2019=E5=B9=B409=E6=9C=8826=E6=97=A5 08:36
<=
strong>=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD o=
ver VXLAN: Trapping BFD Control packet at VTEP
<=
div>
_______________________________________________
nvo3=C2=A0maili=
ng=C2=A0list
nvo3@iet=
f.org
https://www.ietf.org/mailman/listinfo/nvo3

>>>
Some people ma=
y argue that all Tenant Systems connecting to the same Virtual Network MUST=
 share one VAP, if that's true, then VAP1 and VAP3 should merge into on=
e VAP and my explanation doesn't work. Copying to NVO3 WG to involve mo=
re experts, hope for your clarifications and comments.=C2=A0=C2=A0
>>>

I would be one of those that w=
ould argue that they MUST share on VAP if they connect to the same Virtual =
Network.=C2=A0 IMO, the NVO3 arch doc should have been clearer about this.<=
/div>
Thanks,
Anoop

<=
div dir=3D"ltr" class=3D"gmail_attr">On Tue, Sep 24, 2019 at 7:40 PM <xiao.min2@zte.com.c=
n> wrote:
Hi Santosh,

With regard to the question whether we should=C2=A0allow multiple BFD sessions for the same VN=
I or not, IMHO we should allow it, more explanation as follows...
Below is a figure derived from figure 2 of RFC8014 (An Architecture for Data-Center Network Vi=
rtualization over Layer 3 (NVO3)).
                    |         Data Center Network (IP)        |
                    |                                         |
                    +-----------------------------------------+
                         |                           |
                         |       Tunnel Overlay      |
            +------------+---------+       +---------+------------+
            | +----------+-------+ |       | +-------+----------+ |
            | |  Overlay Module  | |       | |  Overlay Module  | |
            | +---------+--------+ |       | +---------+--------+ |
            |           |          |       |           |          |
     NVE1   |           |          |       |           |          | NVE2
            |  +--------+-------+  |       |  +--------+-------+  |
            |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
            |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
            |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
            +----+-----+----+------+       +----+-----+-----+-----+
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
          -------+-----+----+-------------------+-----+-----+-------
                 |     |    |     Tenant        |     |     |
            TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
                +---+ +---+ +---+             +---+ +---+   +---+
                |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
                +---+ +---+ +---+             +---+ +---+   +---+
To my understanding, the BFD sess=
ions between NVE1 and NVE2 are actually initiated and terminated at VAP of =
NVE.
If the network operator want to set up one BFD ses=
sion between VAP1 of NVE1 and VAP1of NVE2, at the same time another BFD ses=
sion between VAP3 of NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same VNI1,=C2=
=A0I believe it's reasonable, so that's why I think we shoul=
d allow it.

Of course, in RFC8014 it also says:=

"Note that two different Tenant Systems (and TSIs) attached t=
o a common NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as t=
hey connect to the same Virtual Network.&=
quot;
Some people may argue that all Tenant Systems c=
onnecting to the same Virtual Network MUST share one VAP, if that's tru=
e, then VAP1 and VAP3 should merge into one VAP and my explanation doesn=
9;t work. Copying to NVO3 WG to involve more experts, hope for your clarifi=
cations and comments.

Best Reg=
ards,
Xiao Min

=



=


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From: Anoop Ghanwani 
Date: Tue, 8 Oct 2019 15:28:10 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: xiao.min2@zte.com.cn
Cc: Greg Mirsky , didutt@gmail.com, draft-ietf-bfd-vxlan@ietf.org,  nvo3@ietf.org, santosh.pallagatti@gmail.com, rtg-bfd WG ,  "Joel M. Halpern" , tsridhar@vmware.com
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Hi Xiao Min,

The picture doesn't have enough information to explain why they are in the
same VNI, and exactly how forwarding happens between the MPLS and non-MPLS
parts.

Anoop

On Tue, Oct 8, 2019 at 12:31 AM  wrote:

> Hi Anoop,
>
>
> I don't know such a draft that describes MPLS over Geneve, but I believe
> the following figure derived from figure 1 of RFC8014 would help, in the
> following figure Tenant System1, Tenant System2, Tenant System3 and Tenan=
t
> System4 are assumed belonging to the same VNI, so two BFD sessions for th=
e
> same VNI need to be run between NVE1 and NVE2.
>
>                                             +--------+
>                                        +----| Tenant |
>                                      ( ' )  | System1|
>             ................       ( MPLS ) +--------+
>             .              .  +--+-+ ( _ )
>             .              .--|NVE1|---+
>             .              .  |    |
>             .              .  +--+-+
>             .              .     |
>             .  L3 Overlay  .   ( ' )
>             .    Network   . (Ethernet)
>             .              .   ( _ )
>             .              .     |
>             ................    +--------+
>                |                | Tenant |
>              +----+             | System2|
>              |NVE2|             +--------+
>              |    |--------+
>              +----+        |
>                |           |
>              ( ' )       ( ' )
>            ( MPLS )    (Ethernet)
>              ( _ )       ( _ )
>                |           |
>            +--------+  +--------+
>            | Tenant |  | Tenant |
>            | System3|  | System4|
>            +--------+  +--------+
>
>
> Best Regards,
>
> Xiao Min
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky =
;didutt@gmail.com <
> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
> santosh.pallagatti@gmail.com ;rtg-bfd WG <
> rtg-bfd@ietf.org>;Joel M. Halpern ;
> tsridhar@vmware.com ;
> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8808=E6=97=A5 12:15
> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD C=
ontrol packet at VTEP*
> Hi Xiao Min,
> Is there a draft that describes MPLS over Geneve?  It sounds like the NVE
> is an MPLS router in this case and if you're using the same VNI as you
> switch MPLS, then it's a one-armed router.  That doesn't change how BFD
> needs to be run between NVEs.
>
> Anoop
>
> On Mon, Oct 7, 2019 at 7:28 PM  wrote:
>
>> Hi Anoop,
>>
>>
>> Sorry for the late response, I just come back from vacation.
>>
>> The use case is that the network between the VM and the NVE is an MPLS
>> network, within which the packet is forwarded basing on MPLS label, but =
not
>> Ethernet MAC address and/or 802.1Q VLAN. When two such kind of MPLS
>> networks need to communicate with each other, through a Geneve tunnel, t=
he
>> encap I illustrated would be used.
>>
>>
>> Best Regards,
>>
>> Xiao Min
>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>> santosh.pallagatti@gmail.com ;rtg-bfd WG <
>> rtg-bfd@ietf.org>;Joel M. Halpern ;
>> tsridhar@vmware.com ;
>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8828=E6=97=A5 05:36
>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD =
Control packet at VTEP*
>> Hi Xiao Min,
>> Thanks for the details about the encap but the use case is not clear.  I=
t
>> might help if you explain why its necessary to map a physical Ethernet p=
ort
>> and/or 802.1Q VLAN to the same VNI as an MPLS packet without an L2 heade=
r.
>>
>> Thanks,
>> Anoop
>>
>> On Thu, Sep 26, 2019 at 7:50 PM  wrote:
>>
>>> Hi Anoop,
>>>
>>>
>>> Due to the fact that a variety of Tunnels could be used under the NVO3 =
architecture,
>>> as an example, below figure illustrates the format of MPLS packet over
>>> Geneve Tunnel.
>>>
>>>     0                   1                   2                   3
>>>     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>    |                                                               |
>>>    ~                      Outer Ethernet Header                    ~
>>>    |                                                               |
>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>    |                                                               |
>>>    ~                        Outer IPvX Header                      ~
>>>    |                                                               |
>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>    |                                                               |
>>>    ~                        Outer UDP Header                       ~
>>>    |                                                               |
>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>    |                                                               |
>>>    ~                          Geneve Header                        ~
>>>    |                                                               |
>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
>>>    |                                                               |  |
>>>    ~                         MPLS Label Stack                      ~  M
>>>    |                                                               |  P
>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  L
>>>    |                                                               |  S
>>>    |                                                               |
>>>    ~                             Payload                           ~  P
>>>    |                                                               |  K
>>>    |                                                               |  T
>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
>>>    |                               FCS                             |
>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>
>>>
>>> Note that in NVO3 working group Greg and I have submitted an individual
>>> draft draft-xiao-nvo3-bfd-geneve, which is used to address BFD over Gen=
eve.
>>>
>>> The intention is to make the two drafts draft-ietf-bfd-vxlan and
>>> draft-xiao-nvo3-bfd-geneve aligned, that is to say, we try to define th=
e
>>> identical mechanism for the common part of BFD over VxLAN Tunnel and BF=
D
>>> over Geneve Tunnel. For the common part, draft-xiao-nvo3-bfd-geneve wou=
ld
>>> reference to draft-ietf-bfd-vxlan, and for the other part specific to
>>> Geneve, we'll define the specific mechanism in draft-xiao-nvo3-bfd-gene=
ve.
>>>
>>>
>>> Hope that clarifies.
>>>
>>>
>>> Best Regards,
>>>
>>> Xiao Min
>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>> santosh.pallagatti@gmail.com ;rtg-bfd WG =
<
>>> rtg-bfd@ietf.org>;Joel M. Halpern ;
>>> tsridhar@vmware.com ;bfd-chairs@ietf.org <
>>> bfd-chairs@ietf.org>;
>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5 23:1=
6
>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD=
 Control packet at VTEP*
>>> Hi Xiao Min,
>>> I think we would need more detail around the use case below.  What does
>>> the MPLS packet over Tunnel look like?
>>>
>>> Thanks,
>>> Anoop
>>>
>>> On Wed, Sep 25, 2019 at 11:37 PM  wrote:
>>>
>>>> Hi Anoop,
>>>>
>>>>
>>>> Thanks for your comments.
>>>>
>>>> Considering a scenario where TS1 has an MPLS access (i.e. MPLS-Packet
>>>> over Tunnel between NVEs) to VNI1, TS3 has an Ethernet access (i.e.
>>>> MAC-Frame over Tunnel between NVEs) to VNI1, then how can TS1 and TS3 =
share
>>>> one VAP?
>>>>
>>>>
>>>> Best Regards,
>>>>
>>>> Xiao Min
>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>> santosh.pallagatti@gmail.com ;rtg-bfd WG
>>>> ;Joel M. Halpern ;
>>>> tsridhar@vmware.com ;bfd-chairs@ietf.org <
>>>> bfd-chairs@ietf.org>;
>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5 08:=
36
>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BF=
D Control packet at VTEP*
>>>> _______________________________________________
>>>> nvo3 mailing list
>>>> nvo3@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>
>>>> >>>
>>>> Some people may argue that all Tenant Systems connecting to the same
>>>> Virtual Network MUST share one VAP, if that's true, then VAP1 and VAP3
>>>> should merge into one VAP and my explanation doesn't work. Copying to =
NVO3
>>>> WG to involve more experts, hope for your clarifications and comments.
>>>> >>>
>>>>
>>>> I would be one of those that would argue that they MUST share on VAP i=
f
>>>> they connect to the same Virtual Network.  IMO, the NVO3 arch doc shou=
ld
>>>> have been clearer about this.
>>>>
>>>> Thanks,
>>>> Anoop
>>>>
>>>> On Tue, Sep 24, 2019 at 7:40 PM  wrote:
>>>>
>>>>> Hi Santosh,
>>>>>
>>>>>
>>>>> With regard to the question whether we should allow multiple BFD
>>>>> sessions for the same VNI or not, IMHO we should allow it, more expla=
nation
>>>>> as follows...
>>>>>
>>>>> Below is a figure derived from figure 2 of RFC8014 (An Architecture
>>>>> for Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>
>>>>>                     |         Data Center Network (IP)        |
>>>>>                     |                                         |
>>>>>                     +-----------------------------------------+
>>>>>                          |                           |
>>>>>                          |       Tunnel Overlay      |
>>>>>             +------------+---------+       +---------+------------+
>>>>>             | +----------+-------+ |       | +-------+----------+ |
>>>>>             | |  Overlay Module  | |       | |  Overlay Module  | |
>>>>>             | +---------+--------+ |       | +---------+--------+ |
>>>>>             |           |          |       |           |          |
>>>>>      NVE1   |           |          |       |           |          | N=
VE2
>>>>>             |  +--------+-------+  |       |  +--------+-------+  |
>>>>>             |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
>>>>>             |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
>>>>>             |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
>>>>>             +----+-----+----+------+       +----+-----+-----+-----+
>>>>>                  |     |    |                   |     |     |
>>>>>                  |     |    |                   |     |     |
>>>>>                  |     |    |                   |     |     |
>>>>>           -------+-----+----+-------------------+-----+-----+-------
>>>>>                  |     |    |     Tenant        |     |     |
>>>>>             TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>>                 |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>>
>>>>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>> actually initiated and terminated at VAP of NVE.
>>>>>
>>>>> If the network operator want to set up one BFD session between VAP1 o=
f
>>>>> NVE1 and VAP1of NVE2, at the same time another BFD session between VA=
P3 of
>>>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same
>>>>> VNI1, I believe it's reasonable, so that's why I think we should
>>>>> allow it.
>>>>>
>>>>>
>>>>> Of course, in RFC8014 it also says:
>>>>>
>>>>> "Note that two different Tenant Systems (and TSIs) attached to a comm=
on NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as they conn=
ect to the same Virtual Network."
>>>>>
>>>>> Some people may argue that all Tenant Systems connecting to the same
>>>>> Virtual Network MUST share one VAP, if that's true, then VAP1 and VAP=
3
>>>>> should merge into one VAP and my explanation doesn't work. Copying to=
 NVO3
>>>>> WG to involve more experts, hope for your clarifications and comments=
.
>>>>>
>>>>>
>>>>> Best Regards,
>>>>>
>>>>> Xiao Min
>>>>>
>>>>
>>>>
>>>
>>
>

--000000000000f713d705946dafc6
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Xiao Min,

The picture doesn't ha=
ve enough information to explain why they are in the same VNI, and exactly =
how forwarding happens between the MPLS and non-MPLS parts.

<=
/div>
Anoop

On Tue, Oct 8, 2019 at 12:31 AM <xiao.min2@zte.com.cn> wrote:
Hi Anoop,

I don't kno=
w such a draft that describes MPLS over Geneve, but I believe the following=
 figure derived from figure 1 of RFC8014 would help, in the following figur=
e Tenant System1, Tenant System2, Tenant System3 and Tenant System4 are ass=
umed belonging to the same VNI, so two BFD sessions for the same VNI need t=
o be run between NVE1 and NVE2.
                                   =
         +--------+
                                       +----| Tenant |
                                     ( ' )  | System1|
            ................       ( MPLS ) +--------+
            .              .  +--+-+ ( _ )
            .              .--|NVE1|---+
            .              .  |    |
            .              .  +--+-+
            .              .     |
            .  L3 Overlay  .   ( ' )
            .    Network   . (Ethernet)
            .              .   ( _ )
            .              .     |
            ................    +--------+
               |                | Tenant |
             +----+             | System2|
             |NVE2|             +--------+
             |    |--------+
             +----+        |
               |           |
             ( ' )       ( ' )
           ( MPLS )    (Ethernet)
             ( _ )       ( _ )
               |           |
           +--------+  +--------+
           | Tenant |  | Tenant |
           | System3|  | System4|
           +--------+  +--------+

Best Regard=
s,
Xiao Min
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=94=
=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=
=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=9C=8808=E6=97=A5 12:15
=
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXL=
AN: Trapping BFD Control packet at VTEP
Hi Xiao Min,
Is there a draft t=
hat describes MPLS over Geneve?=C2=A0 It sounds like the NVE is an MPLS rou=
ter in this case and if you're using the same VNI as you switch MPLS, t=
hen it's a one-armed router.=C2=A0 That doesn't change how BFD need=
s to be run between NVEs.

Anoop

On Mon, Oct 7, 2019 at 7=
:28 PM <xiao.m=
in2@zte.com.cn> wrote:
Hi Anoop,<=
/p>

Sorry for the late response, I just come back f=
rom vacation.
The use case=
 is that the network between the VM and the NVE is an MPLS network, within =
which the packet is forwarded basing on MPLS label, but not Ethernet MAC ad=
dress and/or 802.1Q VLAN. When two such kind of MPLS networks need to commu=
nicate with each other, through a Geneve tunnel, the encap I illustrated wo=
uld be used.

Best Regards,
Xiao Min
=

=E5=8E=9F=E5=A7=8B=E9=
=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A=
AnoopGhanwani <anoop@alumni.duke.edu>
=E6=94=B6=E4=BB=
=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=
=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=
=B9=B409=E6=9C=8828=E6=97=A5 05:36
=E4=B8=BB =E9=A2=98 =
=EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD Control p=
acket at VTEP
Hi Xiao Min,
Thanks for the details about the encap but the use =
case is not clear.=C2=A0 It might help if you explain why its necessary to =
map a physical Ethernet port and/or 802.1Q VLAN to the same VNI as an MPLS =
packet without an L2 header.

Thanks,
Anoop

On =
Thu, Sep 26, 2019 at 7:50 PM <xiao.min2@zte.com.cn> wrote:
Hi Anoop,

=

Due to the fact that=C2=
=A0a variety of Tunnels could be used under the NVO3 architecture, as an example, below figure illustrates=
 the format of MPLS packet over Geneve Tunnel.
<=
/span>
    0                   1                   2               =
    3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                      Outer Ethernet Header                    ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer IPvX Header                      ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer UDP Header                       ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                          Geneve Header                        ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                                                               |  |
   ~                         MPLS Label Stack                      ~  M
   |                                                               |  P
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  L
   |                                                               |  S
   |                                                               |
   ~                             Payload                           ~  P
   |                                                               |  K
   |                                                               |  T
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                               FCS                             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
<=
p style=3D"font-size:14px;font-family:arial">

Note that in NVO3 working group Greg=
 and I have submitted an individual draft draft-xiao-nvo3-bfd-geneve, which=
 is used to address BFD over Geneve.
The intention is to make the two=
 drafts draft-ietf-bfd-vxlan and draft-xiao-nvo3-bfd-geneve aligned, that i=
s to say, we try to define the identical mechanism for the common part of B=
FD over VxLAN Tunnel and BFD over Geneve Tunnel. For the common part, draft=
-xiao-nvo3-bfd-geneve would reference to draft-ietf-bfd-vxlan, and for the =
other part specific to Geneve, we'll define the specific mechanism in d=
raft-xiao-nvo3-bfd-geneve.

Hope that clarifies.

=

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=
=82=AE=E4=BB=B6
=E5=8F=
=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=9C=8826=E6=97=A5 23:16
=E4=B8=BB =
=E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD=
 Control packet at VTEP
Hi Xiao Min,
I think we would need more detail around =
the use case below.=C2=A0 What does the MPLS packet over Tunnel look like?<=
/div>
Thanks,
Anoop

On Wed, Sep 25, 2019 at 11:37 PM=
 <xiao.min2@zt=
e.com.cn> wrote:
Hi Anoop,

Thanks for your comments.
Considering a scenario where TS1 has an MPLS access (=
i.e. MPLS-Packet over Tunnel between NVEs) to VNI1, TS3 has an Ethernet acc=
ess (i.e. MAC-Frame over Tunnel between NVEs) to VNI1, then how can TS1 and=
 TS3 share one VAP?

Best Regards,
Xiao Min
=E5=8E=9F=E5=
=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AA=
noopGhanwani <anoop@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=
=BA=EF=BC=9A=E8=82=96=E6=95=8F10093=
570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=9C=8826=E6=97=A5=
 08:36
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: =
[nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
_______________________________________________
nvo3=C2=A0=
mailing=C2=A0list
nvo=
3@ietf.org
https://www.ietf.org/mailman/listinfo/nvo3

>>>
Some people=
 may argue that all Tenant Systems connecting to the same Virtual Network M=
UST share one VAP, if that's true, then VAP1 and VAP3 should merge into=
 one VAP and my explanation doesn't work. Copying to NVO3 WG to involve=
 more experts, hope for your clarifications and comments.=C2=A0=C2=A0
>>>

I would be one of those tha=
t would argue that they MUST share on VAP if they connect to the same Virtu=
al Network.=C2=A0 IMO, the NVO3 arch doc should have been clearer about thi=
s.

Thanks,
Anoop

On Tue, Sep 24, 2019 at 7:40 PM <=
;xiao.min2@zte.co=
m.cn> wrote:
Hi Santosh,

With regard to the question whether we should=C2=A0allow multiple BFD sessions for the same=
 VNI or not, IMHO we should allow it, more explanation as follows...=

Below is a figure derived from figure 2 of RFC8014 (An Architecture for Data-Center Network =
Virtualization over Layer 3 (NVO3)).
=

                    |         Data Center Network (IP)        |
                    |                                         |
                    +-----------------------------------------+
                         |                           |
                         |       Tunnel Overlay      |
            +------------+---------+       +---------+------------+
            | +----------+-------+ |       | +-------+----------+ |
            | |  Overlay Module  | |       | |  Overlay Module  | |
            | +---------+--------+ |       | +---------+--------+ |
            |           |          |       |           |          |
     NVE1   |           |          |       |           |          | NVE2
            |  +--------+-------+  |       |  +--------+-------+  |
            |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
            |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
            |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
            +----+-----+----+------+       +----+-----+-----+-----+
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
          -------+-----+----+-------------------+-----+-----+-------
                 |     |    |     Tenant        |     |     |
            TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
                +---+ +---+ +---+             +---+ +---+   +---+
                |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
                +---+ +---+ +---+             +---+ +---+   +---+
To my understanding, the BFD sess=
ions between NVE1 and NVE2 are actually initiated and terminated at VAP of =
NVE.
If the network operator want to set up one BFD ses=
sion between VAP1 of NVE1 and VAP1of NVE2, at the same time another BFD ses=
sion between VAP3 of NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same VNI1,=C2=
=A0I believe it's reasonable, so that's why I think we shoul=
d allow it.

Of course, in RFC8014 it also says:=

"Note that two different Tenant Systems (and TSIs) attached t=
o a common NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as t=
hey connect to the same Virtual Network.&=
quot;
Some people may argue that all Tenant Systems c=
onnecting to the same Virtual Network MUST share one VAP, if that's tru=
e, then VAP1 and VAP3 should merge into one VAP and my explanation doesn=
9;t work. Copying to NVO3 WG to involve more experts, hope for your clarifi=
cations and comments.

Best Reg=
ards,
Xiao Min

=



=




--000000000000f713d705946dafc6--


From nobody Tue Oct  8 15:30:59 2019
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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani , xiao.min2@zte.com.cn
Cc: nvo3@ietf.org, draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG 
References:  <201910081529034949208@zte.com.cn> 
From: "Joel M. Halpern" 
Message-ID: <16a956a6-fb5e-3c19-b37d-2c1ef39a4789@joelhalpern.com>
Date: Tue, 8 Oct 2019 18:30:44 -0400
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I will add that from the point of view of VxLAN 9which is the topic), I 
would expect the MPLS packet to arrive in an Ethernet frame, and for 
VxLAN to forward that Ethernet frame.  The VTEP would not seem to even 
need to be aware that the content is MPLS.

Yours,
Joel

On 10/8/2019 6:28 PM, Anoop Ghanwani wrote:
> Hi Xiao Min,
> 
> The picture doesn't have enough information to explain why they are in 
> the same VNI, and exactly how forwarding happens between the MPLS and 
> non-MPLS parts.
> 
> Anoop
> 
> On Tue, Oct 8, 2019 at 12:31 AM  > wrote:
> 
>     Hi Anoop,
> 
> 
>     I don't know such a draft that describes MPLS over Geneve, but I
>     believe the following figure derived from figure 1 of RFC8014 would
>     help, in the following figure Tenant System1, Tenant System2, Tenant
>     System3 and Tenant System4 are assumed belonging to the same VNI, so
>     two BFD sessions for the same VNI need to be run between NVE1 and NVE2.
> 
>                                                  +--------+
>                                             +----| Tenant |
>                                           ( ' )  | System1|
>                  ................       ( MPLS ) +--------+
>                  .              .  +--+-+ ( _ )
>                  .              .--|NVE1|---+
>                  .              .  |    |
>                  .              .  +--+-+
>                  .              .     |
>                  .  L3 Overlay  .   ( ' )
>                  .    Network   . (Ethernet)
>                  .              .   ( _ )
>                  .              .     |
>                  ................    +--------+
>                     |                | Tenant |
>                   +----+             | System2|
>                   |NVE2|             +--------+
>                   |    |--------+
>                   +----+        |
>                     |           |
>                   ( ' )       ( ' )
>                 ( MPLS )    (Ethernet)
>                   ( _ )       ( _ )
>                     |           |
>                 +--------+  +--------+
>                 | Tenant |  | Tenant |
>                 | System3|  | System4|
>                 +--------+  +--------+
> 
> 
>     Best Regards,
> 
>     Xiao Min
> 
>     原始邮件
>     *发件人：*AnoopGhanwani      >
>     *收件人：*肖敏10093570;
>     *抄送人：*Greg Mirsky      >;didutt@gmail.com
>           >;draft-ietf-bfd-vxlan@ietf.org
>     
>          >;nvo3@ietf.org
>           >;santosh.pallagatti@gmail.com
>           >;rtg-bfd WG      >;Joel M. Halpern      >;tsridhar@vmware.com
>           >;
>     *日 期 ：*2019年10月08日 12:15
>     *主 题 ：**Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at
>     VTEP*
>     Hi Xiao Min,
>     Is there a draft that describes MPLS over Geneve?  It sounds like
>     the NVE is an MPLS router in this case and if you're using the same
>     VNI as you switch MPLS, then it's a one-armed router.  That doesn't
>     change how BFD needs to be run between NVEs.
> 
>     Anoop
> 
>     On Mon, Oct 7, 2019 at 7:28 PM      > wrote:
> 
>         Hi Anoop,
> 
> 
>         Sorry for the late response, I just come back from vacation.
> 
>         The use case is that the network between the VM and the NVE is
>         an MPLS network, within which the packet is forwarded basing on
>         MPLS label, but not Ethernet MAC address and/or 802.1Q VLAN.
>         When two such kind of MPLS networks need to communicate with
>         each other, through a Geneve tunnel, the encap I illustrated
>         would be used.
> 
> 
>         Best Regards,
> 
>         Xiao Min
> 
>         原始邮件
>         *发件人：*AnoopGhanwani          >
>         *收件人：*肖敏10093570;
>         *抄送人：*Greg Mirsky          >;didutt@gmail.com
>                   >;draft-ietf-bfd-vxlan@ietf.org
>         
>                  >;nvo3@ietf.org
>                   >;santosh.pallagatti@gmail.com
>         
>                  >;rtg-bfd WG
>         >;Joel M. Halpern
>                  >;tsridhar@vmware.com
>                   >;
>         *日 期 ：*2019年09月28日 05:36
>         *主 题 ：**Re: [nvo3] BFD over VXLAN: Trapping BFD Control
>         packet at VTEP*
>         Hi Xiao Min,
>         Thanks for the details about the encap but the use case is not
>         clear.  It might help if you explain why its necessary to map a
>         physical Ethernet port and/or 802.1Q VLAN to the same VNI as an
>         MPLS packet without an L2 header.
> 
>         Thanks,
>         Anoop
> 
>         On Thu, Sep 26, 2019 at 7:50 PM          > wrote:
> 
>             Hi Anoop,
> 
> 
>             Due to the fact that a variety of Tunnels could be used
>             under the NVO3 architecture, as an example, below figure
>             illustrates the format of MPLS packet over Geneve Tunnel.
> 
>                  0                   1                   2                   3
>                  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>                 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>                 |                                                               |
>                 ~                      Outer Ethernet Header                    ~
>                 |                                                               |
>                 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>                 |                                                               |
>                 ~                        Outer IPvX Header                      ~
>                 |                                                               |
>                 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>                 |                                                               |
>                 ~                        Outer UDP Header                       ~
>                 |                                                               |
>                 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>                 |                                                               |
>                 ~                          Geneve Header                        ~
>                 |                                                               |
>                 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
>                 |                                                               |  |
>                 ~                         MPLS Label Stack                      ~  M
>                 |                                                               |  P
>                 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  L
>                 |                                                               |  S
>                 |                                                               |
>                 ~                             Payload                           ~  P
>                 |                                                               |  K
>                 |                                                               |  T
>                 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
>                 |                               FCS                             |
>                 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> 
> 
>             Note that in NVO3 working group Greg and I have submitted an
>             individual draft draft-xiao-nvo3-bfd-geneve, which is used
>             to address BFD over Geneve.
> 
>             The intention is to make the two drafts draft-ietf-bfd-vxlan
>             and draft-xiao-nvo3-bfd-geneve aligned, that is to say, we
>             try to define the identical mechanism for the common part of
>             BFD over VxLAN Tunnel and BFD over Geneve Tunnel. For the
>             common part, draft-xiao-nvo3-bfd-geneve would reference to
>             draft-ietf-bfd-vxlan, and for the other part specific to
>             Geneve, we'll define the specific mechanism in
>             draft-xiao-nvo3-bfd-geneve.
> 
> 
>             Hope that clarifies.
> 
> 
>             Best Regards,
> 
>             Xiao Min
> 
>             原始邮件
>             *发件人：*AnoopGhanwani              >
>             *收件人：*肖敏10093570;
>             *抄送人：*Greg Mirsky              >;didutt@gmail.com
>                           >;draft-ietf-bfd-vxlan@ietf.org
>             
>                          >;nvo3@ietf.org
>                           >;santosh.pallagatti@gmail.com
>             
>                          >;rtg-bfd WG
>             >;Joel M. Halpern
>                          >;tsridhar@vmware.com
>                           >;bfd-chairs@ietf.org
>                           >;
>             *日 期 ：*2019年09月26日 23:16
>             *主 题 ：**Re: [nvo3] BFD over VXLAN: Trapping BFD Control
>             packet at VTEP*
>             Hi Xiao Min,
>             I think we would need more detail around the use case
>             below.  What does the MPLS packet over Tunnel look like?
> 
>             Thanks,
>             Anoop
> 
>             On Wed, Sep 25, 2019 at 11:37 PM              > wrote:
> 
>                 Hi Anoop,
> 
> 
>                 Thanks for your comments.
> 
>                 Considering a scenario where TS1 has an MPLS access
>                 (i.e. MPLS-Packet over Tunnel between NVEs) to VNI1, TS3
>                 has an Ethernet access (i.e. MAC-Frame over Tunnel
>                 between NVEs) to VNI1, then how can TS1 and TS3 share
>                 one VAP?
> 
> 
>                 Best Regards,
> 
>                 Xiao Min
> 
>                 原始邮件
>                 *发件人：*AnoopGhanwani                  >
>                 *收件人：*肖敏10093570;
>                 *抄送人：*Greg Mirsky                  >;didutt@gmail.com
>                                   >;draft-ietf-bfd-vxlan@ietf.org
>                 
>                                  >;nvo3@ietf.org
>                                   >;santosh.pallagatti@gmail.com
>                 
>                                  >;rtg-bfd WG
>                 >;Joel M.
>                 Halpern                  >;tsridhar@vmware.com
>                                   >;bfd-chairs@ietf.org
>                                   >;
>                 *日 期 ：*2019年09月26日 08:36
>                 *主 题 ：**Re: [nvo3] BFD over VXLAN: Trapping BFD
>                 Control packet at VTEP*
>                 _______________________________________________
>                 nvo3 mailing list
>                 nvo3@ietf.org 
>                 https://www.ietf.org/mailman/listinfo/nvo3
> 
>                  >>>
>                 Some people may argue that all Tenant Systems connecting
>                 to the same Virtual Network MUST share one VAP, if
>                 that's true, then VAP1 and VAP3 should merge into one
>                 VAP and my explanation doesn't work. Copying to NVO3 WG
>                 to involve more experts, hope for your clarifications
>                 and comments.
>                  >>>
> 
>                 I would be one of those that would argue that they MUST
>                 share on VAP if they connect to the same Virtual
>                 Network.  IMO, the NVO3 arch doc should have been
>                 clearer about this.
> 
>                 Thanks,
>                 Anoop
> 
>                 On Tue, Sep 24, 2019 at 7:40 PM                  > wrote:
> 
>                     Hi Santosh,
> 
> 
>                     With regard to the question whether we should allow
>                     multiple BFD sessions for the same VNI or not, IMHO
>                     we should allow it, more explanation as follows...
> 
>                     Below is a figure derived from figure 2 of RFC8014
>                     (An Architecture for Data-Center Network
>                     Virtualization over Layer 3 (NVO3)).
> 
>                                          |         Data Center Network (IP)        |
>                                          |                                         |
>                                          +-----------------------------------------+
>                                               |                           |
>                                               |       Tunnel Overlay      |
>                                  +------------+---------+       +---------+------------+
>                                  | +----------+-------+ |       | +-------+----------+ |
>                                  | |  Overlay Module  | |       | |  Overlay Module  | |
>                                  | +---------+--------+ |       | +---------+--------+ |
>                                  |           |          |       |           |          |
>                           NVE1   |           |          |       |           |          | NVE2
>                                  |  +--------+-------+  |       |  +--------+-------+  |
>                                  |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
>                                  |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
>                                  |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
>                                  +----+-----+----+------+       +----+-----+-----+-----+
>                                       |     |    |                   |     |     |
>                                       |     |    |                   |     |     |
>                                       |     |    |                   |     |     |
>                                -------+-----+----+-------------------+-----+-----+-------
>                                       |     |    |     Tenant        |     |     |
>                                  TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>                                      +---+ +---+ +---+             +---+ +---+   +---+
>                                      |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>                                      +---+ +---+ +---+             +---+ +---+   +---+
> 
>                     To my understanding, the BFD sessions between NVE1
>                     and NVE2 are actually initiated and terminated at
>                     VAP of NVE.
> 
>                     If the network operator want to set up one BFD
>                     session between VAP1 of NVE1 and VAP1of NVE2, at the
>                     same time another BFD session between VAP3 of NVE1
>                     and VAP3 of NVE2, although the two BFD sessions are
>                     for the same VNI1, I believe it's reasonable, so
>                     that's why I think we should allow it.
> 
> 
>                     Of course, in RFC8014 it also says:
> 
>                     "Note that two different Tenant Systems (and TSIs) attached to a common NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as they connect to the same Virtual Network."
> 
>                     Some people may argue that all Tenant Systems
>                     connecting to the same Virtual Network MUST share
>                     one VAP, if that's true, then VAP1 and VAP3 should
>                     merge into one VAP and my explanation doesn't work.
>                     Copying to NVO3 WG to involve more experts, hope for
>                     your clarifications and comments.
> 
> 
>                     Best Regards,
> 
>                     Xiao Min
> 
> 
> 
> 
> 
> 
> _______________________________________________
> nvo3 mailing list
> nvo3@ietf.org
> https://www.ietf.org/mailman/listinfo/nvo3
> 


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From: Anoop Ghanwani 
Date: Wed, 9 Oct 2019 14:32:31 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: xiao.min2@zte.com.cn
Cc: draft-ietf-bfd-vxlan@ietf.org, nvo3@ietf.org,  rtg-bfd WG 
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Hi Xiao Min,

Normally, I think of a VNI as a broadcast domain.  The only way I can make
sense of the picture below is to have a separate VNI for each MPLS
interface on the NVE.

Anoop

On Tue, Oct 8, 2019 at 11:09 PM  wrote:

> Hi Anoop,
>
>
> In this use case there is no forwarding happens between the MPLS and
> non-MPLS parts, would this use case be prohibited?
>
> If the answer is yes, then I agree that all Tenant Systems attached to a
> common NVE MUST share a VAP so long as they connect to the same VN,
> although in RFC8014 it uses "can" but not "MUST". As a result, we should
> not allow multiple BFD sessions for the same VNI between two NVEs.
>
> If the answer is no, then we should allow multiple BFD sessions for the
> same VNI between two NVEs. I personally lean to this answer.
>
>
> Best Regards,
>
> Xiao Min
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky =
;didutt@gmail.com <
> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
> santosh.pallagatti@gmail.com ;rtg-bfd WG <
> rtg-bfd@ietf.org>;Joel M. Halpern ;
> tsridhar@vmware.com ;
> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8809=E6=97=A5 06:28
> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD C=
ontrol packet at VTEP*
> Hi Xiao Min,
> The picture doesn't have enough information to explain why they are in th=
e
> same VNI, and exactly how forwarding happens between the MPLS and non-MPL=
S
> parts.
>
> Anoop
>
> On Tue, Oct 8, 2019 at 12:31 AM  wrote:
>
>> Hi Anoop,
>>
>>
>> I don't know such a draft that describes MPLS over Geneve, but I believe
>> the following figure derived from figure 1 of RFC8014 would help, in the
>> following figure Tenant System1, Tenant System2, Tenant System3 and Tena=
nt
>> System4 are assumed belonging to the same VNI, so two BFD sessions for t=
he
>> same VNI need to be run between NVE1 and NVE2.
>>
>>                                             +--------+
>>                                        +----| Tenant |
>>                                      ( ' )  | System1|
>>             ................       ( MPLS ) +--------+
>>             .              .  +--+-+ ( _ )
>>             .              .--|NVE1|---+
>>             .              .  |    |
>>             .              .  +--+-+
>>             .              .     |
>>             .  L3 Overlay  .   ( ' )
>>             .    Network   . (Ethernet)
>>             .              .   ( _ )
>>             .              .     |
>>             ................    +--------+
>>                |                | Tenant |
>>              +----+             | System2|
>>              |NVE2|             +--------+
>>              |    |--------+
>>              +----+        |
>>                |           |
>>              ( ' )       ( ' )
>>            ( MPLS )    (Ethernet)
>>              ( _ )       ( _ )
>>                |           |
>>            +--------+  +--------+
>>            | Tenant |  | Tenant |
>>            | System3|  | System4|
>>            +--------+  +--------+
>>
>>
>> Best Regards,
>>
>> Xiao Min
>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>> santosh.pallagatti@gmail.com ;rtg-bfd WG <
>> rtg-bfd@ietf.org>;Joel M. Halpern ;
>> tsridhar@vmware.com ;
>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8808=E6=97=A5 12:15
>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD =
Control packet at VTEP*
>> Hi Xiao Min,
>> Is there a draft that describes MPLS over Geneve?  It sounds like the NV=
E
>> is an MPLS router in this case and if you're using the same VNI as you
>> switch MPLS, then it's a one-armed router.  That doesn't change how BFD
>> needs to be run between NVEs.
>>
>> Anoop
>>
>> On Mon, Oct 7, 2019 at 7:28 PM  wrote:
>>
>>> Hi Anoop,
>>>
>>>
>>> Sorry for the late response, I just come back from vacation.
>>>
>>> The use case is that the network between the VM and the NVE is an MPLS
>>> network, within which the packet is forwarded basing on MPLS label, but=
 not
>>> Ethernet MAC address and/or 802.1Q VLAN. When two such kind of MPLS
>>> networks need to communicate with each other, through a Geneve tunnel, =
the
>>> encap I illustrated would be used.
>>>
>>>
>>> Best Regards,
>>>
>>> Xiao Min
>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>> santosh.pallagatti@gmail.com ;rtg-bfd WG =
<
>>> rtg-bfd@ietf.org>;Joel M. Halpern ;
>>> tsridhar@vmware.com ;
>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8828=E6=97=A5 05:3=
6
>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD=
 Control packet at VTEP*
>>> Hi Xiao Min,
>>> Thanks for the details about the encap but the use case is not clear.
>>> It might help if you explain why its necessary to map a physical Ethern=
et
>>> port and/or 802.1Q VLAN to the same VNI as an MPLS packet without an L2
>>> header.
>>>
>>> Thanks,
>>> Anoop
>>>
>>> On Thu, Sep 26, 2019 at 7:50 PM  wrote:
>>>
>>>> Hi Anoop,
>>>>
>>>>
>>>> Due to the fact that a variety of Tunnels could be used under the NVO3=
 architecture,
>>>> as an example, below figure illustrates the format of MPLS packet over
>>>> Geneve Tunnel.
>>>>
>>>>     0                   1                   2                   3
>>>>     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>    |                                                               |
>>>>    ~                      Outer Ethernet Header                    ~
>>>>    |                                                               |
>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>    |                                                               |
>>>>    ~                        Outer IPvX Header                      ~
>>>>    |                                                               |
>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>    |                                                               |
>>>>    ~                        Outer UDP Header                       ~
>>>>    |                                                               |
>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>    |                                                               |
>>>>    ~                          Geneve Header                        ~
>>>>    |                                                               |
>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-=
+
>>>>    |                                                               |  =
|
>>>>    ~                         MPLS Label Stack                      ~  =
M
>>>>    |                                                               |  =
P
>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  =
L
>>>>    |                                                               |  =
S
>>>>    |                                                               |
>>>>    ~                             Payload                           ~  =
P
>>>>    |                                                               |  =
K
>>>>    |                                                               |  =
T
>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-=
+
>>>>    |                               FCS                             |
>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>
>>>>
>>>> Note that in NVO3 working group Greg and I have submitted an individua=
l
>>>> draft draft-xiao-nvo3-bfd-geneve, which is used to address BFD over Ge=
neve.
>>>>
>>>> The intention is to make the two drafts draft-ietf-bfd-vxlan and
>>>> draft-xiao-nvo3-bfd-geneve aligned, that is to say, we try to define t=
he
>>>> identical mechanism for the common part of BFD over VxLAN Tunnel and B=
FD
>>>> over Geneve Tunnel. For the common part, draft-xiao-nvo3-bfd-geneve wo=
uld
>>>> reference to draft-ietf-bfd-vxlan, and for the other part specific to
>>>> Geneve, we'll define the specific mechanism in draft-xiao-nvo3-bfd-gen=
eve.
>>>>
>>>>
>>>> Hope that clarifies.
>>>>
>>>>
>>>> Best Regards,
>>>>
>>>> Xiao Min
>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>> santosh.pallagatti@gmail.com ;rtg-bfd WG
>>>> ;Joel M. Halpern ;
>>>> tsridhar@vmware.com ;bfd-chairs@ietf.org <
>>>> bfd-chairs@ietf.org>;
>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5 23:=
16
>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BF=
D Control packet at VTEP*
>>>> Hi Xiao Min,
>>>> I think we would need more detail around the use case below.  What doe=
s
>>>> the MPLS packet over Tunnel look like?
>>>>
>>>> Thanks,
>>>> Anoop
>>>>
>>>> On Wed, Sep 25, 2019 at 11:37 PM  wrote:
>>>>
>>>>> Hi Anoop,
>>>>>
>>>>>
>>>>> Thanks for your comments.
>>>>>
>>>>> Considering a scenario where TS1 has an MPLS access (i.e. MPLS-Packet
>>>>> over Tunnel between NVEs) to VNI1, TS3 has an Ethernet access (i.e.
>>>>> MAC-Frame over Tunnel between NVEs) to VNI1, then how can TS1 and TS3=
 share
>>>>> one VAP?
>>>>>
>>>>>
>>>>> Best Regards,
>>>>>
>>>>> Xiao Min
>>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>>> santosh.pallagatti@gmail.com ;rtg-bfd
>>>>> WG ;Joel M. Halpern ;
>>>>> tsridhar@vmware.com ;bfd-chairs@ietf.org <
>>>>> bfd-chairs@ietf.org>;
>>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5 08=
:36
>>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping B=
FD Control packet at
>>>>> VTEP*
>>>>> _______________________________________________
>>>>> nvo3 mailing list
>>>>> nvo3@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>
>>>>> >>>
>>>>> Some people may argue that all Tenant Systems connecting to the same
>>>>> Virtual Network MUST share one VAP, if that's true, then VAP1 and VAP=
3
>>>>> should merge into one VAP and my explanation doesn't work. Copying to=
 NVO3
>>>>> WG to involve more experts, hope for your clarifications and comments=
.
>>>>> >>>
>>>>>
>>>>> I would be one of those that would argue that they MUST share on VAP
>>>>> if they connect to the same Virtual Network.  IMO, the NVO3 arch doc =
should
>>>>> have been clearer about this.
>>>>>
>>>>> Thanks,
>>>>> Anoop
>>>>>
>>>>> On Tue, Sep 24, 2019 at 7:40 PM  wrote:
>>>>>
>>>>>> Hi Santosh,
>>>>>>
>>>>>>
>>>>>> With regard to the question whether we should allow multiple BFD
>>>>>> sessions for the same VNI or not, IMHO we should allow it, more expl=
anation
>>>>>> as follows...
>>>>>>
>>>>>> Below is a figure derived from figure 2 of RFC8014 (An Architecture
>>>>>> for Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>>
>>>>>>                     |         Data Center Network (IP)        |
>>>>>>                     |                                         |
>>>>>>                     +-----------------------------------------+
>>>>>>                          |                           |
>>>>>>                          |       Tunnel Overlay      |
>>>>>>             +------------+---------+       +---------+------------+
>>>>>>             | +----------+-------+ |       | +-------+----------+ |
>>>>>>             | |  Overlay Module  | |       | |  Overlay Module  | |
>>>>>>             | +---------+--------+ |       | +---------+--------+ |
>>>>>>             |           |          |       |           |          |
>>>>>>      NVE1   |           |          |       |           |          | =
NVE2
>>>>>>             |  +--------+-------+  |       |  +--------+-------+  |
>>>>>>             |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
>>>>>>             |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
>>>>>>             |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
>>>>>>             +----+-----+----+------+       +----+-----+-----+-----+
>>>>>>                  |     |    |                   |     |     |
>>>>>>                  |     |    |                   |     |     |
>>>>>>                  |     |    |                   |     |     |
>>>>>>           -------+-----+----+-------------------+-----+-----+-------
>>>>>>                  |     |    |     Tenant        |     |     |
>>>>>>             TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>>>                 |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>>>
>>>>>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>>> actually initiated and terminated at VAP of NVE.
>>>>>>
>>>>>> If the network operator want to set up one BFD session between VAP1
>>>>>> of NVE1 and VAP1of NVE2, at the same time another BFD session betwee=
n VAP3
>>>>>> of NVE1 and VAP3 of NVE2, although the two BFD sessions are for the
>>>>>> same VNI1, I believe it's reasonable, so that's why I think we
>>>>>> should allow it.
>>>>>>
>>>>>>
>>>>>> Of course, in RFC8014 it also says:
>>>>>>
>>>>>> "Note that two different Tenant Systems (and TSIs) attached to a com=
mon NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as they con=
nect to the same Virtual Network."
>>>>>>
>>>>>> Some people may argue that all Tenant Systems connecting to the same
>>>>>> Virtual Network MUST share one VAP, if that's true, then VAP1 and VA=
P3
>>>>>> should merge into one VAP and my explanation doesn't work. Copying t=
o NVO3
>>>>>> WG to involve more experts, hope for your clarifications and comment=
s.
>>>>>>
>>>>>>
>>>>>> Best Regards,
>>>>>>
>>>>>> Xiao Min
>>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
> _______________________________________________
> nvo3 mailing list
> nvo3@ietf.org
> https://www.ietf.org/mailman/listinfo/nvo3
>

--000000000000efe915059481065f
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Xiao Min,

Normally,=
 I think of a VNI as a broadcast domain.=C2=A0 The only way I can make sens=
e of the picture below is to have a separate VNI for each MPLS interface on=
 the NVE.

Anoop

On Tue, Oct 8, 2019 at 11:09 =
PM <xiao.min2@zte.com.cn>=
 wrote:
Hi Anoop,

In this use case there is no forwarding happens between the MPLS =
and non-MPLS parts, would this use case be prohibited?
If the answer is yes, then I agree that all Te=
nant Systems attached to a common NVE MUST share a VAP so long as they conn=
ect to the same VN, although in RFC8014 it uses "can" but not &qu=
ot;MUST". As a result, we should not allow multiple BFD sessions for t=
he same VNI between two NVEs.
If the answer is no, then we should=C2=A0allow multiple=
 BFD sessions for the same VNI between two NVEs. I personally lean to this answer.

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6=

=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=9C=8809=E6=
=97=A5 06:28
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VT=
EP
Hi Xiao Min,
The picture doesn't have enough information to explain why they are =
in the same VNI, and exactly how forwarding happens between the MPLS and no=
n-MPLS parts.

Anoop

On Tue, Oct 8, 2019 at 12:31 AM <=
xiao.min2@zte.com=
.cn> wrote:
Hi Anoop,

I don't know such a draft that describes MPLS over=
 Geneve, but I believe the following figure derived from figure 1 of RFC801=
4 would help, in the following figure Tenant System1, Tenant System2, Tenan=
t System3 and Tenant System4 are assumed belonging to the same VNI, so two =
BFD sessions for the same VNI need to be run between NVE1 and NVE2.
                                            +--------+
                                       +----| Tenant |
                                     ( ' )  | System1|
            ................       ( MPLS ) +--------+
            .              .  +--+-+ ( _ )
            .              .--|NVE1|---+
            .              .  |    |
            .              .  +--+-+
            .              .     |
            .  L3 Overlay  .   ( ' )
            .    Network   . (Ethernet)
            .              .   ( _ )
            .              .     |
            ................    +--------+
               |                | Tenant |
             +----+             | System2|
             |NVE2|             +--------+
             |    |--------+
             +----+        |
               |           |
             ( ' )       ( ' )
           ( MPLS )    (Ethernet)
             ( _ )       ( _ )
               |           |
           +--------+  +--------+
           | Tenant |  | Tenant |
           | System3|  | System4|
           +--------+  +--------+

Best Regard=
s,
Xiao Min
=E5=8F=91=
=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =
=EF=BC=9A2019=E5=B9=B410=E6=9C=8808=E6=97=A5 12:15
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN:=
 Trapping BFD Control packet at VTEP
Hi Xiao Min,
Is there a draft that descri=
bes MPLS over Geneve?=C2=A0 It sounds like the NVE is an MPLS router in thi=
s case and if you're using the same VNI as you switch MPLS, then it'=
;s a one-armed router.=C2=A0 That doesn't change how BFD needs to be ru=
n between NVEs.

Anoop

On Mon, Oct 7, 2019 at 7:28 PM <=
;xiao.min2@zte.co=
m.cn> wrote:
Hi Anoop,

Sorry for the late response, I just come back from vacati=
on.
The use case is that t=
he network between the VM and the NVE is an MPLS network, within which the =
packet is forwarded basing on MPLS label, but not Ethernet MAC address and/=
or 802.1Q VLAN. When two such kind of MPLS networks need to communicate wit=
h each other, through a Geneve tunnel, the encap I illustrated would be use=
d.

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=
=BB=B6
=E5=8F=91=E4=BB=
=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=
=9A2019=E5=B9=B409=E6=9C=8828=E6=97=A5 05:36
=E4=
=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapp=
ing BFD Control packet at VTEP
Hi Xiao Min,
Thanks for the details about the e=
ncap but the use case is not clear.=C2=A0 It might help if you explain why =
its necessary to map a physical Ethernet port and/or 802.1Q VLAN to the sam=
e VNI as an MPLS packet without an L2 header.

Thanks,
Anoop

On Thu, Sep 26, 2019 at 7:50 PM <xiao.min2@zte.com.cn> wrote:
<=
/div>
Hi Anoop,

Due to=
 the fact that=C2=A0a variety of Tunnels could be used under the NVO3 architecture, as an example, below f=
igure illustrates the format of MPLS packet over Geneve Tunnel.
<=
p style=3D"font-size:14px;font-family:arial">
    0                   1                   2=
                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                      Outer Ethernet Header                    ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer IPvX Header                      ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer UDP Header                       ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                          Geneve Header                        ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                                                               |  |
   ~                         MPLS Label Stack                      ~  M
   |                                                               |  P
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  L
   |                                                               |  S
   |                                                               |
   ~                             Payload                           ~  P
   |                                                               |  K
   |                                                               |  T
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                               FCS                             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
<=
p style=3D"font-size:14px;font-family:arial">

Note that in NVO3 working group Greg=
 and I have submitted an individual draft draft-xiao-nvo3-bfd-geneve, which=
 is used to address BFD over Geneve.
The intention is to make the two=
 drafts draft-ietf-bfd-vxlan and draft-xiao-nvo3-bfd-geneve aligned, that i=
s to say, we try to define the identical mechanism for the common part of B=
FD over VxLAN Tunnel and BFD over Geneve Tunnel. For the common part, draft=
-xiao-nvo3-bfd-geneve would reference to draft-ietf-bfd-vxlan, and for the =
other part specific to Geneve, we'll define the specific mechanism in d=
raft-xiao-nvo3-bfd-geneve.

Hope that clarifies.

=

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=
=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanw=
ani <anoop@al=
umni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=
=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5=
 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=9C=8826=E6=97=A5 23:16
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD =
over VXLAN: Trapping BFD Control packet at VTEP
Hi Xiao Min,
I think we would =
need more detail around the use case below.=C2=A0 What does the MPLS packet=
 over Tunnel look like?

Thanks,
Anoop
On Wed, =
Sep 25, 2019 at 11:37 PM <xiao.min2@zte.com.cn> wrote:
Hi Anoop,

Thanks for your comments.
Considering a scenario where=
 TS1 has an MPLS access (i.e. MPLS-Packet over Tunnel between NVEs) to VNI1=
, TS3 has an Ethernet access (i.e. MAC-Frame over Tunnel between NVEs) to V=
NI1, then how can TS1 and TS3 share one VAP?

Be=
st Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9AGreg Mirsky <gregimirsky@gmail.com>;didutt@gmail.com &l=
t;didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <<=
a href=3D"mailto:draft-ietf-bfd-vxlan@ietf.org" target=3D"_blank">draft-iet=
f-bfd-vxlan@ietf.org>;nvo3@ietf.org <nvo3@ietf.org>;santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.co=
m>;rtg-bfd WG <rtg-bfd@ietf.org>;<=
span style=3D"display:inline">Joel M. Halpern <jmh@joelhalpern.com>;tsridhar@vmware.com <tsridhar@vmware.com>;bfd-chairs@i=
etf.org <bf=
d-chairs@ietf.org>;
=E6=97=A5 =E6=9C=9F =EF=
=BC=9A2019=E5=B9=B409=E6=9C=8826=E6=97=A5 08:36
=
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Tr=
apping BFD Control packet at VTEP
___________=
____________________________________
nvo3=C2=A0mailing=C2=A0list
nvo3@ietf.org
https://w=
ww.ietf.org/mailman/listinfo/nvo3

>>>
Some people may argue that all Tenan=
t Systems connecting to the same Virtual Network MUST share one VAP, if tha=
t's true, then VAP1 and VAP3 should merge into one VAP and my explanati=
on doesn't work. Copying to NVO3 WG to involve more experts, hope for y=
our clarifications and comments.=C2=A0=C2=A0
>=
>>

I would be one of those that would argue that they M=
UST share on VAP if they connect to the same Virtual Network.=C2=A0 IMO, th=
e NVO3 arch doc should have been clearer about this.

Thanks,<=
/div>
Anoop

On Tue, Sep 24, 2019 at 7:40 PM <xiao.min2@zte.com.cn> wrote:
<=
/div>
Hi Santosh,

With=
 regard to the question whether we should=C2=A0allow multiple BFD sessions for the same VNI or not, IMHO we sho=
uld allow it, more explanation as follows...
Below is a=
 figure derived from figure 2 of RFC8014 (An Architecture for Data-Center Network Virtualization over Laye=
r 3 (NVO3)).
                   =
 |         Data Center Network (IP)        |
                    |                                         |
                    +-----------------------------------------+
                         |                           |
                         |       Tunnel Overlay      |
            +------------+---------+       +---------+------------+
            | +----------+-------+ |       | +-------+----------+ |
            | |  Overlay Module  | |       | |  Overlay Module  | |
            | +---------+--------+ |       | +---------+--------+ |
            |           |          |       |           |          |
     NVE1   |           |          |       |           |          | NVE2
            |  +--------+-------+  |       |  +--------+-------+  |
            |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
            |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
            |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
            +----+-----+----+------+       +----+-----+-----+-----+
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
          -------+-----+----+-------------------+-----+-----+-------
                 |     |    |     Tenant        |     |     |
            TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
                +---+ +---+ +---+             +---+ +---+   +---+
                |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
                +---+ +---+ +---+             +---+ +---+   +---+
To my understanding, the BFD sess=
ions between NVE1 and NVE2 are actually initiated and terminated at VAP of =
NVE.
If the network operator want to set up one BFD ses=
sion between VAP1 of NVE1 and VAP1of NVE2, at the same time another BFD ses=
sion between VAP3 of NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same VNI1,=C2=
=A0I believe it's reasonable, so that's why I think we shoul=
d allow it.

Of course, in RFC8014 it also says:=

"Note that two different Tenant Systems (and TSIs) attached t=
o a common NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as t=
hey connect to the same Virtual Network.&=
quot;
Some people may argue that all Tenant Systems c=
onnecting to the same Virtual Network MUST share one VAP, if that's tru=
e, then VAP1 and VAP3 should merge into one VAP and my explanation doesn=
9;t work. Copying to NVO3 WG to involve more experts, hope for your clarifi=
cations and comments.

Best Reg=
ards,
Xiao Min

=



=



_____________=
__________________________________

nvo3 mailing list

nvo3@ietf.org

https://www.ietf.org/mailman/listinfo/nvo3



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From: Anoop Ghanwani 
Date: Thu, 10 Oct 2019 00:40:26 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: xiao.min2@zte.com.cn
Cc: draft-ietf-bfd-vxlan@ietf.org, nvo3@ietf.org,  rtg-bfd WG 
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Hi Xiao Min,

In those cases, the term "VN" is used to talk about multiple IP interfaces
in a VRF.  The different interfaces would have to be different VNIs.

In the mixed case (with MPLS and L2 hitting the NVE at different VAPs), I'm
not sure how it would work in the same VNI.  If you think it's important, I
think it may be worth writing it up.  If there's enough merit in the use
case, we can figure out how to run multiple BFD sessions on the same VNI.

Anoop

On Wed, Oct 9, 2019 at 11:06 PM  wrote:

> Hi Anoop,
>
>
> Normally, it is. While Tenant Systems connect to NVE through IP routing
> network or MPLS forwarding network, it is not.
>
>
> Best Regards,
>
> Xiao Min
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*draft-ietf-bfd-vxlan@ietf.org ;
> nvo3@ietf.org ;rtg-bfd WG ;
> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8810=E6=97=A5 05:33
> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD C=
ontrol packet at VTEP*
> Hi Xiao Min,
> Normally, I think of a VNI as a broadcast domain.  The only way I can mak=
e
> sense of the picture below is to have a separate VNI for each MPLS
> interface on the NVE.
>
> Anoop
>
> On Tue, Oct 8, 2019 at 11:09 PM  wrote:
>
>> Hi Anoop,
>>
>>
>> In this use case there is no forwarding happens between the MPLS and
>> non-MPLS parts, would this use case be prohibited?
>>
>> If the answer is yes, then I agree that all Tenant Systems attached to a
>> common NVE MUST share a VAP so long as they connect to the same VN,
>> although in RFC8014 it uses "can" but not "MUST". As a result, we should
>> not allow multiple BFD sessions for the same VNI between two NVEs.
>>
>> If the answer is no, then we should allow multiple BFD sessions for the
>> same VNI between two NVEs. I personally lean to this answer.
>>
>>
>> Best Regards,
>>
>> Xiao Min
>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>> santosh.pallagatti@gmail.com ;rtg-bfd WG <
>> rtg-bfd@ietf.org>;Joel M. Halpern ;
>> tsridhar@vmware.com ;
>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8809=E6=97=A5 06:28
>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD =
Control packet at VTEP*
>> Hi Xiao Min,
>> The picture doesn't have enough information to explain why they are in
>> the same VNI, and exactly how forwarding happens between the MPLS and
>> non-MPLS parts.
>>
>> Anoop
>>
>> On Tue, Oct 8, 2019 at 12:31 AM  wrote:
>>
>>> Hi Anoop,
>>>
>>>
>>> I don't know such a draft that describes MPLS over Geneve, but I believ=
e
>>> the following figure derived from figure 1 of RFC8014 would help, in th=
e
>>> following figure Tenant System1, Tenant System2, Tenant System3 and Ten=
ant
>>> System4 are assumed belonging to the same VNI, so two BFD sessions for =
the
>>> same VNI need to be run between NVE1 and NVE2.
>>>
>>>                                             +--------+
>>>                                        +----| Tenant |
>>>                                      ( ' )  | System1|
>>>             ................       ( MPLS ) +--------+
>>>             .              .  +--+-+ ( _ )
>>>             .              .--|NVE1|---+
>>>             .              .  |    |
>>>             .              .  +--+-+
>>>             .              .     |
>>>             .  L3 Overlay  .   ( ' )
>>>             .    Network   . (Ethernet)
>>>             .              .   ( _ )
>>>             .              .     |
>>>             ................    +--------+
>>>                |                | Tenant |
>>>              +----+             | System2|
>>>              |NVE2|             +--------+
>>>              |    |--------+
>>>              +----+        |
>>>                |           |
>>>              ( ' )       ( ' )
>>>            ( MPLS )    (Ethernet)
>>>              ( _ )       ( _ )
>>>                |           |
>>>            +--------+  +--------+
>>>            | Tenant |  | Tenant |
>>>            | System3|  | System4|
>>>            +--------+  +--------+
>>>
>>>
>>> Best Regards,
>>>
>>> Xiao Min
>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>> santosh.pallagatti@gmail.com ;rtg-bfd WG =
<
>>> rtg-bfd@ietf.org>;Joel M. Halpern ;
>>> tsridhar@vmware.com ;
>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8808=E6=97=A5 12:1=
5
>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD=
 Control packet at VTEP*
>>> Hi Xiao Min,
>>> Is there a draft that describes MPLS over Geneve?  It sounds like the
>>> NVE is an MPLS router in this case and if you're using the same VNI as =
you
>>> switch MPLS, then it's a one-armed router.  That doesn't change how BFD
>>> needs to be run between NVEs.
>>>
>>> Anoop
>>>
>>> On Mon, Oct 7, 2019 at 7:28 PM  wrote:
>>>
>>>> Hi Anoop,
>>>>
>>>>
>>>> Sorry for the late response, I just come back from vacation.
>>>>
>>>> The use case is that the network between the VM and the NVE is an MPLS
>>>> network, within which the packet is forwarded basing on MPLS label, bu=
t not
>>>> Ethernet MAC address and/or 802.1Q VLAN. When two such kind of MPLS
>>>> networks need to communicate with each other, through a Geneve tunnel,=
 the
>>>> encap I illustrated would be used.
>>>>
>>>>
>>>> Best Regards,
>>>>
>>>> Xiao Min
>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>> santosh.pallagatti@gmail.com ;rtg-bfd WG
>>>> ;Joel M. Halpern ;
>>>> tsridhar@vmware.com ;
>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8828=E6=97=A5 05:=
36
>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BF=
D Control packet at VTEP*
>>>> Hi Xiao Min,
>>>> Thanks for the details about the encap but the use case is not clear.
>>>> It might help if you explain why its necessary to map a physical Ether=
net
>>>> port and/or 802.1Q VLAN to the same VNI as an MPLS packet without an L=
2
>>>> header.
>>>>
>>>> Thanks,
>>>> Anoop
>>>>
>>>> On Thu, Sep 26, 2019 at 7:50 PM  wrote:
>>>>
>>>>> Hi Anoop,
>>>>>
>>>>>
>>>>> Due to the fact that a variety of Tunnels could be used under the NVO=
3
>>>>> architecture, as an example, below figure illustrates the format of
>>>>> MPLS packet over Geneve Tunnel.
>>>>>
>>>>>     0                   1                   2                   3
>>>>>     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>    |                                                               |
>>>>>    ~                      Outer Ethernet Header                    ~
>>>>>    |                                                               |
>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>    |                                                               |
>>>>>    ~                        Outer IPvX Header                      ~
>>>>>    |                                                               |
>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>    |                                                               |
>>>>>    ~                        Outer UDP Header                       ~
>>>>>    |                                                               |
>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>    |                                                               |
>>>>>    ~                          Geneve Header                        ~
>>>>>    |                                                               |
>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<=
-+
>>>>>    |                                                               | =
 |
>>>>>    ~                         MPLS Label Stack                      ~ =
 M
>>>>>    |                                                               | =
 P
>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =
 L
>>>>>    |                                                               | =
 S
>>>>>    |                                                               |
>>>>>    ~                             Payload                           ~ =
 P
>>>>>    |                                                               | =
 K
>>>>>    |                                                               | =
 T
>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<=
-+
>>>>>    |                               FCS                             |
>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>
>>>>>
>>>>> Note that in NVO3 working group Greg and I have submitted an
>>>>> individual draft draft-xiao-nvo3-bfd-geneve, which is used to address=
 BFD
>>>>> over Geneve.
>>>>>
>>>>> The intention is to make the two drafts draft-ietf-bfd-vxlan and
>>>>> draft-xiao-nvo3-bfd-geneve aligned, that is to say, we try to define =
the
>>>>> identical mechanism for the common part of BFD over VxLAN Tunnel and =
BFD
>>>>> over Geneve Tunnel. For the common part, draft-xiao-nvo3-bfd-geneve w=
ould
>>>>> reference to draft-ietf-bfd-vxlan, and for the other part specific to
>>>>> Geneve, we'll define the specific mechanism in draft-xiao-nvo3-bfd-ge=
neve.
>>>>>
>>>>>
>>>>> Hope that clarifies.
>>>>>
>>>>>
>>>>> Best Regards,
>>>>>
>>>>> Xiao Min
>>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>>> santosh.pallagatti@gmail.com ;rtg-bfd
>>>>> WG ;Joel M. Halpern ;
>>>>> tsridhar@vmware.com ;bfd-chairs@ietf.org <
>>>>> bfd-chairs@ietf.org>;
>>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5 23=
:16
>>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping B=
FD Control packet at
>>>>> VTEP*
>>>>> Hi Xiao Min,
>>>>> I think we would need more detail around the use case below.  What
>>>>> does the MPLS packet over Tunnel look like?
>>>>>
>>>>> Thanks,
>>>>> Anoop
>>>>>
>>>>> On Wed, Sep 25, 2019 at 11:37 PM  wrote:
>>>>>
>>>>>> Hi Anoop,
>>>>>>
>>>>>>
>>>>>> Thanks for your comments.
>>>>>>
>>>>>> Considering a scenario where TS1 has an MPLS access (i.e. MPLS-Packe=
t
>>>>>> over Tunnel between NVEs) to VNI1, TS3 has an Ethernet access (i.e.
>>>>>> MAC-Frame over Tunnel between NVEs) to VNI1, then how can TS1 and TS=
3 share
>>>>>> one VAP?
>>>>>>
>>>>>>
>>>>>> Best Regards,
>>>>>>
>>>>>> Xiao Min
>>>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>>>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>>>> santosh.pallagatti@gmail.com ;rtg-bfd
>>>>>> WG ;Joel M. Halpern ;
>>>>>> tsridhar@vmware.com ;bfd-chairs@ietf.org <
>>>>>> bfd-chairs@ietf.org>;
>>>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5 0=
8:36
>>>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping =
BFD Control packet at
>>>>>> VTEP*
>>>>>> _______________________________________________
>>>>>> nvo3 mailing list
>>>>>> nvo3@ietf.org
>>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>>
>>>>>> >>>
>>>>>> Some people may argue that all Tenant Systems connecting to the same
>>>>>> Virtual Network MUST share one VAP, if that's true, then VAP1 and VA=
P3
>>>>>> should merge into one VAP and my explanation doesn't work. Copying t=
o NVO3
>>>>>> WG to involve more experts, hope for your clarifications and comment=
s.
>>>>>> >>>
>>>>>>
>>>>>> I would be one of those that would argue that they MUST share on VAP
>>>>>> if they connect to the same Virtual Network.  IMO, the NVO3 arch doc=
 should
>>>>>> have been clearer about this.
>>>>>>
>>>>>> Thanks,
>>>>>> Anoop
>>>>>>
>>>>>> On Tue, Sep 24, 2019 at 7:40 PM  wrote:
>>>>>>
>>>>>>> Hi Santosh,
>>>>>>>
>>>>>>>
>>>>>>> With regard to the question whether we should allow multiple BFD
>>>>>>> sessions for the same VNI or not, IMHO we should allow it, more exp=
lanation
>>>>>>> as follows...
>>>>>>>
>>>>>>> Below is a figure derived from figure 2 of RFC8014 (An Architecture
>>>>>>> for Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>>>
>>>>>>>                     |         Data Center Network (IP)        |
>>>>>>>                     |                                         |
>>>>>>>                     +-----------------------------------------+
>>>>>>>                          |                           |
>>>>>>>                          |       Tunnel Overlay      |
>>>>>>>             +------------+---------+       +---------+------------+
>>>>>>>             | +----------+-------+ |       | +-------+----------+ |
>>>>>>>             | |  Overlay Module  | |       | |  Overlay Module  | |
>>>>>>>             | +---------+--------+ |       | +---------+--------+ |
>>>>>>>             |           |          |       |           |          |
>>>>>>>      NVE1   |           |          |       |           |          |=
 NVE2
>>>>>>>             |  +--------+-------+  |       |  +--------+-------+  |
>>>>>>>             |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
>>>>>>>             |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
>>>>>>>             |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
>>>>>>>             +----+-----+----+------+       +----+-----+-----+-----+
>>>>>>>                  |     |    |                   |     |     |
>>>>>>>                  |     |    |                   |     |     |
>>>>>>>                  |     |    |                   |     |     |
>>>>>>>           -------+-----+----+-------------------+-----+-----+------=
-
>>>>>>>                  |     |    |     Tenant        |     |     |
>>>>>>>             TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>>>>                 |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>>>>
>>>>>>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>>>> actually initiated and terminated at VAP of NVE.
>>>>>>>
>>>>>>> If the network operator want to set up one BFD session between VAP1
>>>>>>> of NVE1 and VAP1of NVE2, at the same time another BFD session betwe=
en VAP3
>>>>>>> of NVE1 and VAP3 of NVE2, although the two BFD sessions are for the
>>>>>>> same VNI1, I believe it's reasonable, so that's why I think we
>>>>>>> should allow it.
>>>>>>>
>>>>>>>
>>>>>>> Of course, in RFC8014 it also says:
>>>>>>>
>>>>>>> "Note that two different Tenant Systems (and TSIs) attached to a co=
mmon NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as they co=
nnect to the same Virtual Network."
>>>>>>>
>>>>>>> Some people may argue that all Tenant Systems connecting to the sam=
e
>>>>>>> Virtual Network MUST share one VAP, if that's true, then VAP1 and V=
AP3
>>>>>>> should merge into one VAP and my explanation doesn't work. Copying =
to NVO3
>>>>>>> WG to involve more experts, hope for your clarifications and commen=
ts.
>>>>>>>
>>>>>>>
>>>>>>> Best Regards,
>>>>>>>
>>>>>>> Xiao Min
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>> _______________________________________________
>> nvo3 mailing list
>> nvo3@ietf.org
>> https://www.ietf.org/mailman/listinfo/nvo3
>>
>
>

--0000000000007f542105948984bb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Xiao Min,

In those cases, the term &=
quot;VN" is used to talk about multiple IP interfaces in a VRF.=C2=A0 =
The different interfaces would have to be different VNIs.

In the mixed case (with MPLS and L2 hitting the NVE at different VA=
Ps), I'm not sure how it would work in the same VNI.=C2=A0 If you think=
 it's important, I think it may be worth writing it up.=C2=A0 If there&=
#39;s enough merit in the use case, we can figure out how to run multiple B=
FD sessions on the same VNI.

Anoop

=

On Wed, Oc=
t 9, 2019 at 11:06 PM <xiao.min2=
@zte.com.cn> wrote:
Hi Anoop,
=


Normally, it is. While Tenant Systems connect to NVE through IP routing ne=
twork or MPLS forwarding network, it is not.

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=
=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoop=
Ghanwani <ano=
op@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=
=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10=
093570;
=E6=97=A5 =
=E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=9C=8810=E6=97=A5 05:33=

=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP<=
/span>
Hi Xiao Min,<=
br>
Normally, I think of a VNI as a broadcast domain.=C2=A0 The only wa=
y I can make sense of the picture below is to have a separate VNI for each =
MPLS interface on the NVE.

Anoop

On Tue, Oct 8, 2019 at =
11:09 PM <xiao=
.min2@zte.com.cn> wrote:
Hi Anoop=
,

In this use case there is no forwarding h=
appens between the MPLS and non-MPLS parts, would this use case be prohibit=
ed?
If the answer is yes, =
then I agree that all Tenant Systems attached to a common NVE MUST share a =
VAP so long as they connect to the same VN, although in RFC8014 it uses &qu=
ot;can" but not "MUST". As a result, we should not allow mul=
tiple BFD sessions for the same VNI between two NVEs.
If the answer is no, then we should=C2=A0allow multiple BFD sessions for the same VNI between two NVEs. I personally lean t=
o this answer.

=

Best Regards,
Xiao Min
=E5=8E=9F=E5=
=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=
=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=
=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=
=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=9C=8809=E6=97=A5 06:28
=E4=B8=BB =
=E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD=
 Control packet at VTEP
Hi X=
iao Min,
The picture doesn't have enough information to explain=
 why they are in the same VNI, and exactly how forwarding happens between t=
he MPLS and non-MPLS parts.

Anoop

On Tue, Oct 8, 2019 =
at 12:31 AM <x=
iao.min2@zte.com.cn> wrote:
Hi An=
oop,

I don't know such a draft that de=
scribes MPLS over Geneve, but I believe the following figure derived from f=
igure 1 of RFC8014 would help, in the following figure Tenant System1, Tena=
nt System2, Tenant System3 and Tenant System4 are assumed belonging to the =
same VNI, so two BFD sessions for the same VNI need to be run between NVE1 =
and NVE2.
                                            +--------+
                                       +----| Tenant |
                                     ( ' )  | System1|
            ................       ( MPLS ) +--------+
            .              .  +--+-+ ( _ )
            .              .--|NVE1|---+
            .              .  |    |
            .              .  +--+-+
            .              .     |
            .  L3 Overlay  .   ( ' )
            .    Network   . (Ethernet)
            .              .   ( _ )
            .              .     |
            ................    +--------+
               |                | Tenant |
             +----+             | System2|
             |NVE2|             +--------+
             |    |--------+
             +----+        |
               |           |
             ( ' )       ( ' )
           ( MPLS )    (Ethernet)
             ( _ )       ( _ )
               |           |
           +--------+  +--------+
           | Tenant |  | Tenant |
           | System3|  | System4|
           +--------+  +--------+

Best Regard=
s,
Xiao Min
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani =
<anoop@alumni=
.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=9C=8808=E6=97=A5=
 12:15
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: =
[nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
Hi Xiao Min,
Is the=
re a draft that describes MPLS over Geneve?=C2=A0 It sounds like the NVE is=
 an MPLS router in this case and if you're using the same VNI as you sw=
itch MPLS, then it's a one-armed router.=C2=A0 That doesn't change =
how BFD needs to be run between NVEs.

Anoop

On Mon, Oct =
7, 2019 at 7:28 PM <xiao.min2@zte.com.cn> wrote:
Hi Anoop,

Sorry for the late response, I just=
 come back from vacation.
=
The use case is that the network between the VM and the NVE is an MPLS netw=
ork, within which the packet is forwarded basing on MPLS label, but not Eth=
ernet MAC address and/or 802.1Q VLAN. When two such kind of MPLS networks n=
eed to communicate with each other, through a Geneve tunnel, the encap I il=
lustrated would be used.
<=
br>
Best Regards,
Xiao Min
=E5=8E=9F=
=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=
=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10=
093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=
=E6=9C=8828=E6=97=A5 05:36
=E4=B8=BB =E9=A2=98 =EF=BC=9A<=
/strong>Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at V=
TEP
Hi Xiao=
 Min,
Thanks for the details about the encap but the use case is no=
t clear.=C2=A0 It might help if you explain why its necessary to map a phys=
ical Ethernet port and/or 802.1Q VLAN to the same VNI as an MPLS packet wit=
hout an L2 header.

Thanks,
Anoop

On Thu, Sep 2=
6, 2019 at 7:50 PM <xiao.min2@zte.com.cn> wrote:
Hi Anoop,

Due to the fact that=C2=A0a variety=
 of Tunnels could be used under the NVO3 architecture, as an example, below figure illustrates the format =
of MPLS packet over Geneve Tunnel.
    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                      Outer Ethernet Header                    ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer IPvX Header                      ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer UDP Header                       ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                          Geneve Header                        ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                                                               |  |
   ~                         MPLS Label Stack                      ~  M
   |                                                               |  P
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  L
   |                                                               |  S
   |                                                               |
   ~                             Payload                           ~  P
   |                                                               |  K
   |                                                               |  T
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                               FCS                             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<=
p style=3D"font-size:14px;font-family:arial">

Note that in NVO3 working group Greg=
 and I have submitted an individual draft draft-xiao-nvo3-bfd-geneve, which=
 is used to address BFD over Geneve.
The intention is to make the two=
 drafts draft-ietf-bfd-vxlan and draft-xiao-nvo3-bfd-geneve aligned, that i=
s to say, we try to define the identical mechanism for the common part of B=
FD over VxLAN Tunnel and BFD over Geneve Tunnel. For the common part, draft=
-xiao-nvo3-bfd-geneve would reference to draft-ietf-bfd-vxlan, and for the =
other part specific to Geneve, we'll define the specific mechanism in d=
raft-xiao-nvo3-bfd-geneve.

Hope that clarifies.

=

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=
=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=
=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=94=
=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=
=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=
=E6=9C=8826=E6=97=A5 23:16
=E4=B8=BB =E9=A2=98 =EF=BC=9A<=
/strong>Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at V=
TEP
Hi Xiao=
 Min,
I think we would need more detail around the use case below.=
=C2=A0 What does the MPLS packet over Tunnel look like?

Thank=
s,
Anoop

On Wed, Sep 25, 2019 at 11:37 PM <xiao.min2@zte.com.cn> wr=
ote:
Hi Anoop,

Thanks for your comments.
Considering a scenario where TS1 has an MPLS access (i.e. MPLS-Packet ov=
er Tunnel between NVEs) to VNI1, TS3 has an Ethernet access (i.e. MAC-Frame=
 over Tunnel between NVEs) to VNI1, then how can TS1 and TS3 share one VAP?=


Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=
=BB=B6
=E5=8F=
=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=9C=8826=E6=97=A5 08:36
=E4=B8=BB =
=E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD=
 Control packet at VTEP
_____________________=
__________________________
nvo3=C2=A0mailing=C2=A0list
nvo3@ietf.org
https://www.ietf.or=
g/mailman/listinfo/nvo3

>&g=
t;>
Some people may argue that all Tenant Systems =
connecting to the same Virtual Network MUST share one VAP, if that's tr=
ue, then VAP1 and VAP3 should merge into one VAP and my explanation doesn&#=
39;t work. Copying to NVO3 WG to involve more experts, hope for your clarif=
ications and comments.=C2=A0=C2=A0
>>>
I would be one of those that would argue that they MUST share =
on VAP if they connect to the same Virtual Network.=C2=A0 IMO, the NVO3 arc=
h doc should have been clearer about this.

Thanks,
=
Anoop

On Tue, Sep 24, 2019 at 7:40 PM <xiao.min2@zte.com.cn> wrote:
Hi Santosh,

With regard to =
the question whether we should=C2=A0=
allow multiple BFD sessions for the same VNI or not, IMHO we should allow i=
t, more explanation as follows...
Below is a figure der=
ived from figure 2 of RFC8014 (An Architecture for Data-Center Network Virtualization over Layer 3 (NVO3=
)).
                    |       =
  Data Center Network (IP)        |
                    |                                         |
                    +-----------------------------------------+
                         |                           |
                         |       Tunnel Overlay      |
            +------------+---------+       +---------+------------+
            | +----------+-------+ |       | +-------+----------+ |
            | |  Overlay Module  | |       | |  Overlay Module  | |
            | +---------+--------+ |       | +---------+--------+ |
            |           |          |       |           |          |
     NVE1   |           |          |       |           |          | NVE2
            |  +--------+-------+  |       |  +--------+-------+  |
            |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
            |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
            |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
            +----+-----+----+------+       +----+-----+-----+-----+
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
          -------+-----+----+-------------------+-----+-----+-------
                 |     |    |     Tenant        |     |     |
            TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
                +---+ +---+ +---+             +---+ +---+   +---+
                |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
                +---+ +---+ +---+             +---+ +---+   +---+
To my understanding, the BFD sess=
ions between NVE1 and NVE2 are actually initiated and terminated at VAP of =
NVE.
If the network operator want to set up one BFD ses=
sion between VAP1 of NVE1 and VAP1of NVE2, at the same time another BFD ses=
sion between VAP3 of NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same VNI1,=C2=
=A0I believe it's reasonable, so that's why I think we shoul=
d allow it.

Of course, in RFC8014 it also says:=

"Note that two different Tenant Systems (and TSIs) attached t=
o a common NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as t=
hey connect to the same Virtual Network.&=
quot;
Some people may argue that all Tenant Systems c=
onnecting to the same Virtual Network MUST share one VAP, if that's tru=
e, then VAP1 and VAP3 should merge into one VAP and my explanation doesn=
9;t work. Copying to NVO3 WG to involve more experts, hope for your clarifi=
cations and comments.

Best Reg=
ards,
Xiao Min

=



=



_____________=
__________________________________
nvo3 mailing list
nvo3@ietf.org
ht=
tps://www.ietf.org/mailman/listinfo/nvo3



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From: Anoop Ghanwani 
Date: Thu, 10 Oct 2019 14:33:38 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: xiao.min2@zte.com.cn
Cc: draft-ietf-bfd-vxlan@ietf.org, nvo3@ietf.org,  rtg-bfd WG 
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Hi Xiao Min,

Can you provide more detail on your scenario?  I'm having trouble figuring
it out from the description below.  I need to know what subnets the tenants
are in.

Anoop

On Thu, Oct 10, 2019 at 5:00 AM  wrote:

> Hi Anoop,
>
>
> Please see my response inline with [XM].
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*draft-ietf-bfd-vxlan@ietf.org ;
> nvo3@ietf.org ;rtg-bfd WG ;
> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8810=E6=97=A5 15:47
> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD C=
ontrol packet at VTEP*
> _______________________________________________
> nvo3 mailing list
> nvo3@ietf.org
> https://www.ietf.org/mailman/listinfo/nvo3
>
> Hi Xiao Min,
>
> In those cases, the term "VN" is used to talk about multiple IP interface=
s
> in a VRF.  The different interfaces would have to be different VNIs.
>
> [XM] To be clear, I interpret VNI as Virtual Network Identifier that
> should be present within VxLAN/Geneve header. Do you mean in the case
> multiple Tenant Systems connect to multiple NVEs through IP routing
> network, different NVEs must encapsulate different Virtual Network
> Identifiers?
>
> In the mixed case (with MPLS and L2 hitting the NVE at different VAPs),
> I'm not sure how it would work in the same VNI.  If you think it's
> important, I think it may be worth writing it up.  If there's enough meri=
t
> in the use case, we can figure out how to run multiple BFD sessions on th=
e
> same VNI.
>
> [XM] As to the mixed case, I don't know whether there's enough merit, I
> just raise it for discussion because it seems not being prohibited from t=
he
> NVO3 architecture point of view.
>
>
> Anoop
>
>
> Best Regards,
>
> Xiao Min
>
>
> On Wed, Oct 9, 2019 at 11:06 PM  wrote:
>
>> Hi Anoop,
>>
>>
>> Normally, it is. While Tenant Systems connect to NVE through IP routing
>> network or MPLS forwarding network, it is not.
>>
>>
>> Best Regards,
>>
>> Xiao Min
>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*draft-ietf-bfd-vxlan@ietf.org ;
>> nvo3@ietf.org ;rtg-bfd WG ;
>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8810=E6=97=A5 05:33
>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD =
Control packet at VTEP*
>> Hi Xiao Min,
>> Normally, I think of a VNI as a broadcast domain.  The only way I can
>> make sense of the picture below is to have a separate VNI for each MPLS
>> interface on the NVE.
>>
>> Anoop
>>
>> On Tue, Oct 8, 2019 at 11:09 PM > > wrote:
>>
>>> Hi Anoop,
>>>
>>>
>>> In this use case there is no forwarding happens between the MPLS and
>>> non-MPLS parts, would this use case be prohibited?
>>>
>>> If the answer is yes, then I agree that all Tenant Systems attached to =
a
>>> common NVE MUST share a VAP so long as they connect to the same VN,
>>> although in RFC8014 it uses "can" but not "MUST". As a result, we shoul=
d
>>> not allow multiple BFD sessions for the same VNI between two NVEs.
>>>
>>> If the answer is no, then we should allow multiple BFD sessions for the
>>> same VNI between two NVEs. I personally lean to this answer.
>>>
>>>
>>> Best Regards,
>>>
>>> Xiao Min
>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>> santosh...pallagatti@gmail.com  <
>>> santosh.pallagatti@gmail.com>;rtg-bfd WG ;Joel M.
>>> Halpern ;tsridhar@vmware.com =
;
>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8809=E6=97=A5 06:2=
8
>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD=
 Control packet at VTEP*
>>> Hi Xiao Min,
>>> The picture doesn't have enough information to explain why they are in
>>> the same VNI, and exactly how forwarding happens between the MPLS and
>>> non-MPLS parts.
>>>
>>> Anoop
>>>
>>> On Tue, Oct 8, 2019 at 12:31 AM  wrote:
>>>
>>>> Hi Anoop,
>>>>
>>>>
>>>> I don't know such a draft that describes MPLS over Geneve, but I
>>>> believe the following figure derived from figure 1 of RFC8014 would he=
lp,
>>>> in the following figure Tenant System1, Tenant System2, Tenant System3=
 and
>>>> Tenant System4 are assumed belonging to the same VNI, so two BFD sessi=
ons
>>>> for the same VNI need to be run between NVE1 and NVE2.
>>>>
>>>>                                             +--------+
>>>>                                        +----| Tenant |
>>>>                                      ( ' )  | System1|
>>>>             ................       ( MPLS ) +--------+
>>>>             .              .  +--+-+ ( _ )
>>>>             .              .--|NVE1|---+
>>>>             .              .  |    |
>>>>             .              .  +--+-+
>>>>             .              .     |
>>>>             .  L3 Overlay  .   ( ' )
>>>>             .    Network   . (Ethernet)
>>>>             .              .   ( _ )
>>>>             .              .     |
>>>>             ................    +--------+
>>>>                |                | Tenant |
>>>>              +----+             | System2|
>>>>              |NVE2|             +--------+
>>>>              |    |--------+
>>>>              +----+        |
>>>>                |           |
>>>>              ( ' )       ( ' )
>>>>            ( MPLS )    (Ethernet)
>>>>              ( _ )       ( _ )
>>>>                |           |
>>>>            +--------+  +--------+
>>>>            | Tenant |  | Tenant |
>>>>            | System3|  | System4|
>>>>            +--------+  +--------+
>>>>
>>>>
>>>> Best Regards,
>>>>
>>>> Xiao Min
>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani >
>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail...com
>>>>  ;draft-ietf-bfd-vxlan@ietf.org <
>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>> santosh.pallagatti@gmail.com ;rtg-bfd WG
>>>> ;Joel M. Halpern ;
>>>> tsridhar@vmware.com ;
>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8808=E6=97=A5 12:=
15
>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BF=
D Control packet at VTEP*
>>>> Hi Xiao Min,
>>>> Is there a draft that describes MPLS over Geneve?  It sounds like the
>>>> NVE is an MPLS router in this case and if you're using the same VNI as=
 you
>>>> switch MPLS, then it's a one-armed router.  That doesn't change how BF=
D
>>>> needs to be run between NVEs.
>>>>
>>>> Anoop
>>>>
>>>> On Mon, Oct 7, 2019 at 7:28 PM  wrote:
>>>>
>>>>> Hi Anoop,
>>>>>
>>>>>
>>>>> Sorry for the late response, I just come back from vacation.
>>>>>
>>>>> The use case is that the network between the VM and the NVE is an MPL=
S
>>>>> network, within which the packet is forwarded basing on MPLS label, b=
ut not
>>>>> Ethernet MAC address and/or 802.1Q VLAN. When two such kind of MPLS
>>>>> networks need to communicate with each other, through a Geneve tunnel=
, the
>>>>> encap I illustrated would be used.
>>>>>
>>>>>
>>>>> Best Regards,
>>>>>
>>>>> Xiao Min
>>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>>> santosh.pallagatti@gmail.com ;rtg-bfd
>>>>> WG ;Joel M. Halpern >>>> >;tsridhar@vmware.com ;
>>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8828=E6=97=A5 05=
:36
>>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping B=
FD Control packet at
>>>>> VTEP*
>>>>> Hi Xiao Min,
>>>>> Thanks for the details about the encap but the use case is not clear.
>>>>> It might help if you explain why its necessary to map a physical Ethe=
rnet
>>>>> port and/or 802.1Q VLAN to the same VNI as an MPLS packet without an =
L2
>>>>> header.
>>>>>
>>>>> Thanks,
>>>>> Anoop
>>>>>
>>>>> On Thu, Sep 26, 2019 at 7:50 PM  wrote:
>>>>>
>>>>>> Hi Anoop,
>>>>>>
>>>>>>
>>>>>> Due to the fact that a variety of Tunnels could be used under the
>>>>>> NVO3 architecture, as an example, below figure illustrates the
>>>>>> format of MPLS packet over Geneve Tunnel.
>>>>>>
>>>>>>     0                   1                   2                   3
>>>>>>     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>>    |                                                               |
>>>>>>    ~                      Outer Ethernet Header                    ~
>>>>>>    |                                                               |
>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>>    |                                                               |
>>>>>>    ~                        Outer IPvX Header                      ~
>>>>>>    |                                                               |
>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>>    |                                                               |
>>>>>>    ~                        Outer UDP Header                       ~
>>>>>>    |                                                               |
>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>>    |                                                               |
>>>>>>    ~                          Geneve Header                        ~
>>>>>>    |                                                               |
>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
<-+
>>>>>>    |                                                               |=
  |
>>>>>>    ~                         MPLS Label Stack                      ~=
  M
>>>>>>    |                                                               |=
  P
>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
  L
>>>>>>    |                                                               |=
  S
>>>>>>    |                                                               |
>>>>>>    ~                             Payload                           ~=
  P
>>>>>>    |                                                               |=
  K
>>>>>>    |                                                               |=
  T
>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
<-+
>>>>>>    |                               FCS                             |
>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>>>>
>>>>>>
>>>>>> Note that in NVO3 working group Greg and I have submitted an
>>>>>> individual draft draft-xiao-nvo3-bfd-geneve, which is used to addres=
s BFD
>>>>>> over Geneve.
>>>>>>
>>>>>> The intention is to make the two drafts draft-ietf-bfd-vxlan and
>>>>>> draft-xiao-nvo3-bfd-geneve aligned, that is to say, we try to define=
 the
>>>>>> identical mechanism for the common part of BFD over VxLAN Tunnel and=
 BFD
>>>>>> over Geneve Tunnel. For the common part, draft-xiao-nvo3-bfd-geneve =
would
>>>>>> reference to draft-ietf-bfd-vxlan, and for the other part specific t=
o
>>>>>> Geneve, we'll define the specific mechanism in draft-xiao-nvo3-bfd-g=
eneve.
>>>>>>
>>>>>>
>>>>>> Hope that clarifies.
>>>>>>
>>>>>>
>>>>>> Best Regards,
>>>>>>
>>>>>> Xiao Min
>>>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com
>>>>>>  ;draft-ietf-bfd-vxlan@ietf.or=
g
>>>>>> ;nvo3@ietf.org ;
>>>>>> santosh.pallagatti@gmail.com ;rtg-bfd
>>>>>> WG ;Joel M. Halpern ;
>>>>>> tsridhar@vmware.com >;
>>>>>> bfd-chairs@ietf.org ;
>>>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5 2=
3:16
>>>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping =
BFD Control packet at
>>>>>> VTEP*
>>>>>> Hi Xiao Min,
>>>>>> I think we would need more detail around the use case below.  What
>>>>>> does the MPLS packet over Tunnel look like?
>>>>>>
>>>>>> Thanks,
>>>>>> Anoop
>>>>>>
>>>>>> On Wed, Sep 25, 2019 at 11:37 PM  wrote:
>>>>>>
>>>>>>> Hi Anoop,
>>>>>>>
>>>>>>>
>>>>>>> Thanks for your comments.
>>>>>>>
>>>>>>> Considering a scenario where TS1 has an MPLS access (i.e.
>>>>>>> MPLS-Packet over Tunnel between NVEs) to VNI1, TS3 has an Ethernet =
access
>>>>>>> (i.e. MAC-Frame over Tunnel between NVEs) to VNI1, then how can TS1=
 and TS3
>>>>>>> share one VAP?
>>>>>>>
>>>>>>>
>>>>>>> Best Regards,
>>>>>>>
>>>>>>> Xiao Min
>>>>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>>>>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>>>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>>>>> santosh.pallagatti@gmail.com ;rtg-bfd
>>>>>>> WG ;Joel M. Halpern ;
>>>>>>> tsridhar@vmware.com ;bfd-chairs@ietf.org <
>>>>>>> bfd-chairs@ietf.org>;
>>>>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5 =
08:36
>>>>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping=
 BFD Control packet at
>>>>>>> VTEP*
>>>>>>> _______________________________________________
>>>>>>> nvo3 mailing list
>>>>>>> nvo3@ietf.org
>>>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>>>
>>>>>>> >>>
>>>>>>> Some people may argue that all Tenant Systems connecting to the sam=
e
>>>>>>> Virtual Network MUST share one VAP, if that's true, then VAP1 and V=
AP3
>>>>>>> should merge into one VAP and my explanation doesn't work. Copying =
to NVO3
>>>>>>> WG to involve more experts, hope for your clarifications and commen=
ts.
>>>>>>> >>>
>>>>>>>
>>>>>>> I would be one of those that would argue that they MUST share on VA=
P
>>>>>>> if they connect to the same Virtual Network.  IMO, the NVO3 arch do=
c should
>>>>>>> have been clearer about this.
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Anoop
>>>>>>>
>>>>>>> On Tue, Sep 24, 2019 at 7:40 PM  wrote:
>>>>>>>
>>>>>>>> Hi Santosh,
>>>>>>>>
>>>>>>>>
>>>>>>>> With regard to the question whether we should allow multiple BFD
>>>>>>>> sessions for the same VNI or not, IMHO we should allow it, more ex=
planation
>>>>>>>> as follows...
>>>>>>>>
>>>>>>>> Below is a figure derived from figure 2 of RFC8014 (An
>>>>>>>> Architecture for Data-Center Network Virtualization over Layer 3 (=
NVO3)
>>>>>>>> ).
>>>>>>>>
>>>>>>>>                     |         Data Center Network (IP)        |
>>>>>>>>                     |                                         |
>>>>>>>>                     +-----------------------------------------+
>>>>>>>>                          |                           |
>>>>>>>>                          |       Tunnel Overlay      |
>>>>>>>>             +------------+---------+       +---------+------------=
+
>>>>>>>>             | +----------+-------+ |       | +-------+----------+ =
|
>>>>>>>>             | |  Overlay Module  | |       | |  Overlay Module  | =
|
>>>>>>>>             | +---------+--------+ |       | +---------+--------+ =
|
>>>>>>>>             |           |          |       |           |          =
|
>>>>>>>>      NVE1   |           |          |       |           |          =
| NVE2
>>>>>>>>             |  +--------+-------+  |       |  +--------+-------+  =
|
>>>>>>>>             |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  =
|
>>>>>>>>             |  +-+-----+----+---+  |       |  +-+-----+-----+--+  =
|
>>>>>>>>             |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3=
|
>>>>>>>>             +----+-----+----+------+       +----+-----+-----+-----=
+
>>>>>>>>                  |     |    |                   |     |     |
>>>>>>>>                  |     |    |                   |     |     |
>>>>>>>>                  |     |    |                   |     |     |
>>>>>>>>           -------+-----+----+-------------------+-----+-----+-----=
--
>>>>>>>>                  |     |    |     Tenant        |     |     |
>>>>>>>>             TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>>>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>>>>>                 |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>>>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>>>>>
>>>>>>>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>>>>> actually initiated and terminated at VAP of NVE.
>>>>>>>>
>>>>>>>> If the network operator want to set up one BFD session between VAP=
1
>>>>>>>> of NVE1 and VAP1of NVE2, at the same time another BFD session betw=
een VAP3
>>>>>>>> of NVE1 and VAP3 of NVE2, although the two BFD sessions are for
>>>>>>>> the same VNI1, I believe it's reasonable, so that's why I think we
>>>>>>>> should allow it.
>>>>>>>>
>>>>>>>>
>>>>>>>> Of course, in RFC8014 it also says:
>>>>>>>>
>>>>>>>> "Note that two different Tenant Systems (and TSIs) attached to a c=
ommon NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as they c=
onnect to the same Virtual Network."
>>>>>>>>
>>>>>>>> Some people may argue that all Tenant Systems connecting to the
>>>>>>>> same Virtual Network MUST share one VAP, if that's true, then VAP1=
 and VAP3
>>>>>>>> should merge into one VAP and my explanation doesn't work. Copying=
 to NVO3
>>>>>>>> WG to involve more experts, hope for your clarifications and comme=
nts.
>>>>>>>>
>>>>>>>>
>>>>>>>> Best Regards,
>>>>>>>>
>>>>>>>> Xiao Min
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>> _______________________________________________
>>> nvo3 mailing list
>>> nvo3@ietf.org
>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>
>>
>>
>

--00000000000042158d059495281a
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Xiao Min,

Can you p=
rovide more detail on your scenario?=C2=A0 I'm having trouble figuring =
it out from the description below.=C2=A0 I need to know what subnets the te=
nants are in.

Anoop

On Thu, Oct 10, 2019 at 5=
:00 AM <xiao.min2@zte.com.cn=
> wrote:
Hi Anoop,

Please see my response inline with [XM].
=E5=8E=
=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=94=B6=E4=
=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=
=E6=95=8F10093570;
=
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=9C=8810=E6=
=97=A5 15:47
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VT=
EP
________________________________________=
_______
nvo3=C2=A0mailing=C2=A0list
nvo3@ietf.org
https://www.ietf.org/mailman/listinfo/=
nvo3

Hi Xiao Min,
In those cases, the ter=
m "VN" is used to talk about multiple IP interfaces in a VRF.=C2=
=A0 The different interfaces would have to be different VNIs.
[XM] To=
 be clear, I interpret VNI as Virtual Network Identifier that should be pre=
sent within VxLAN/Geneve header. Do you mean in the case multiple Tenant Sy=
stems connect to multiple NVEs through IP routing network, different NVEs m=
ust encapsulate different Virtual Network Identifiers?

In the mix=
ed case (with MPLS and L2 hitting the NVE at different VAPs), I'm not s=
ure how it would work in the same VNI.=C2=A0 If you think it's importan=
t, I think it may be worth writing it up.=C2=A0 If there's enough merit=
 in the use case, we can figure out how to run multiple BFD sessions on the=
 same VNI.
[XM] As to the mixed case, I don't know whether there&=
#39;s enough merit, I just raise it for discussion because it seems not bei=
ng prohibited from the NVO3 architecture point of view.

An=
oop

Best Regards,
Xiao Mi=
n

On Wed, Oct 9, 2019 at 11:06 PM <xiao.min2@zte.com.cn> wrote:
Hi Anoop,

Normally, it is.=
 While Tenant Systems co=
nnect to NVE through IP routing network or MPLS forwarding network, it is n=
ot.

Be=
st Regards,
Xiao Mi=
n
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
Hi Xiao Min,
Normally, I think of a VNI as a broadcast domain.=
=C2=A0 The only way I can make sense of the picture below is to have a sepa=
rate VNI for each MPLS interface on the NVE.

Anoop

On Tu=
e, Oct 8, 2019 at 11:09 PM <xiao...min2@zte.com.cn> wrote:
Hi Anoop,
=

In this use case ther=
e is no forwarding happens between the MPLS and non-MPLS parts, would this =
use case be prohibited?
If=
 the answer is yes, then I agree that all Tenant Systems attached to a comm=
on NVE MUST share a VAP so long as they connect to the same VN, although in=
 RFC8014 it uses "can" but not "MUST". As a result, we =
should not allow multiple BFD sessions for the same VNI between two NVEs.
If the answer is no, then <=
span style=3D"font-family:arial;line-height:21px">we should=C2=A0allow multiple BFD sessions for the same VNI =
between two NVEs.=
 I personally lean to this answer.

Best =
Regards,
Xiao Min
=

=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGh=
anwani <anoop=
@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=
=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9AGreg Mirsky <gregimirsky@gmail.com>;d=
idutt@gmail.com <didutt@gmail.com>;draft-ietf-bfd-=
vxlan@ietf.org <draft-ietf-bfd-vxlan@ietf.org>;nvo3@iet=
f.org <nvo3@ietf.=
org>;santosh...pallagatti@gmail.com=
 <sant=
osh.pallagatti@gmail.com>;rtg-=
bfd WG <rtg-bfd@ie=
tf.org>;Joel M. Halpern <jmh@joelhalpern.com<=
/a>>;tsridhar@vmware.com <tsridhar@vmware.com>;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=
=9C=8809=E6=97=A5 06:28
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP=

Hi Xiao Min,
The pi=
cture doesn't have enough information to explain why they are in the sa=
me VNI, and exactly how forwarding happens between the MPLS and non-MPLS pa=
rts.

Anoop

On Tue, Oct 8, 2019 at 12:31 AM <xiao.min2@zte.com.cn=
> wrote:
Hi Anoop,

I don't know such a draft that describes MPLS over Geneve=
, but I believe the following figure derived from figure 1 of RFC8014 would=
 help, in the following figure Tenant System1, Tenant System2, Tenant Syste=
m3 and Tenant System4 are assumed belonging to the same VNI, so two BFD ses=
sions for the same VNI need to be run between NVE1 and NVE2.
      =
                                      +--------+
                                       +----| Tenant |
                                     ( ' )  | System1|
            ................       ( MPLS ) +--------+
            .              .  +--+-+ ( _ )
            .              .--|NVE1|---+
            .              .  |    |
            .              .  +--+-+
            .              .     |
            .  L3 Overlay  .   ( ' )
            .    Network   . (Ethernet)
            .              .   ( _ )
            .              .     |
            ................    +--------+
               |                | Tenant |
             +----+             | System2|
             |NVE2|             +--------+
             |    |--------+
             +----+        |
               |           |
             ( ' )       ( ' )
           ( MPLS )    (Ethernet)
             ( _ )       ( _ )
               |           |
           +--------+  +--------+
           | Tenant |  | Tenant |
           | System3|  | System4|
           +--------+  +--------+

Best Regard=
s,
Xiao Min
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=
=BC=9AAnoopGhanwani <anoop@alumni...duke.edu>
=E6=94=
=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=
=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=9C=8808=E6=97=A5 12:15
=E4=B8=BB =
=E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD=
 Control packet at VTEP
Hi Xiao Min,
Is there a draft that describes MPLS over=
 Geneve?=C2=A0 It sounds like the NVE is an MPLS router in this case and if=
 you're using the same VNI as you switch MPLS, then it's a one-arme=
d router.=C2=A0 That doesn't change how BFD needs to be run between NVE=
s.

Anoop

On Mon, Oct 7, 2019 at 7:28 PM <xiao.min2@zte.com.cn>=
; wrote:
Hi Anoop,

Sorry for the late response, I just come back from vacation.
The use case is that the network =
between the VM and the NVE is an MPLS network, within which the packet is f=
orwarded basing on MPLS label, but not Ethernet MAC address and/or 802.1Q V=
LAN. When two such kind of MPLS networks need to communicate with each othe=
r, through a Geneve tunnel, the encap I illustrated would be used.

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=

=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAno=
opGhanwani <a=
noop@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=BA=
=EF=BC=9A=E8=82=96=E6=95=8F10093570=
;
=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9AGreg Mirsky <gregimirsky@gmail.com>;=
didutt@gmail.com <didutt@gmail.com>;draft-ietf-bfd-=
vxlan@ietf.org <draft-ietf-bfd-vxlan@ietf.org>;nvo3@iet=
f.org <nvo3@ietf.=
org>;santosh.pallagatti@gmail.com &=
lt;santos=
h.pallagatti@gmail.com>;rtg-bf=
d WG <rtg-bfd@ietf=
.org>;Joel M. Halpern <jmh@joelhalpern...com<=
/a>>;tsridhar@vmware.com <tsridhar@vmware.com>;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=
=9C=8828=E6=97=A5 05:36
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP=

Hi Xiao Mi=
n,
Thanks for the details about the encap but the use case is not c=
lear.=C2=A0 It might help if you explain why its necessary to map a physica=
l Ethernet port and/or 802.1Q VLAN to the same VNI as an MPLS packet withou=
t an L2 header.

Thanks,
Anoop

On Thu, Sep 26, =
2019 at 7:50 PM <xiao.min2@zte.com.cn> wrote:
H=
i Anoop,

Due to the fact that=C2=A0a variety o=
f Tunnels could be used under the NVO3 architecture, as an example, below figure illustrates the format =
of MPLS packet over Geneve Tunnel.
    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                      Outer Ethernet Header                    ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer IPvX Header                      ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer UDP Header                       ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                          Geneve Header                        ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                                                               |  |
   ~                         MPLS Label Stack                      ~  M
   |                                                               |  P
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  L
   |                                                               |  S
   |                                                               |
   ~                             Payload                           ~  P
   |                                                               |  K
   |                                                               |  T
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                               FCS                             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<=
p style=3D"font-size:14px;font-family:arial">

Note that in NVO3 working group Greg=
 and I have submitted an individual draft draft-xiao-nvo3-bfd-geneve, which=
 is used to address BFD over Geneve.
The intention is to make the two=
 drafts draft-ietf-bfd-vxlan and draft-xiao-nvo3-bfd-geneve aligned, that i=
s to say, we try to define the identical mechanism for the common part of B=
FD over VxLAN Tunnel and BFD over Geneve Tunnel. For the common part, draft=
-xiao-nvo3-bfd-geneve would reference to draft-ietf-bfd-vxlan, and for the =
other part specific to Geneve, we'll define the specific mechanism in d=
raft-xiao-nvo3-bfd-geneve.

Hope that clarifies.

=

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=
=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu&g=
t;
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=
=BC=9A2019=E5=B9=B409=E6=9C=8826=E6=97=A5 23:16
=
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Tr=
apping BFD Control packet at VTEP
Hi Xiao Min,
I think we would need more deta=
il around the use case below.=C2=A0 What does the MPLS packet over Tunnel l=
ook like?

Thanks,
Anoop

On Wed, Sep 25, 2019=
 at 11:37 PM <=
xiao.min2@zte.com.cn> wrote:
Hi A=
noop,

Thanks for your comments.
Considering a scenario where TS1 has an M=
PLS access (i.e. MPLS-Packet over Tunnel between NVEs) to VNI1, TS3 has an =
Ethernet access (i.e. MAC-Frame over Tunnel between NVEs) to VNI1, then how=
 can TS1 and TS3 share one VAP?

Best Regards,
Xiao Min
=
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=
=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=
=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=
=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=
=B409=E6=9C=8826=E6=97=A5 08:36
=E4=B8=BB =E9=A2=98 =EF=
=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD Control pack=
et at VTEP
__________________________________=
_____________
nvo3=C2=A0mailing=C2=A0list
nvo3@ietf.org
https://www.ietf.org/mailman/lis=
tinfo/nvo3

>>>
<=
div dir=3D"ltr">Some people may argue that all Tenant Systems connecting to=
 the same Virtual Network MUST share one VAP, if that's true, then VAP1=
 and VAP3 should merge into one VAP and my explanation doesn't work. Co=
pying to NVO3 WG to involve more experts, hope for your clarifications and =
comments.=C2=A0=C2=A0
>>>

=
I would be one of those that would argue that they MUST share on VAP if the=
y connect to the same Virtual Network.=C2=A0 IMO, the NVO3 arch doc should =
have been clearer about this.

Thanks,
Anoop
On Tue, =
Sep 24, 2019 at 7:40 PM <xiao.min2@zte.com.cn> wrote:
Hi Santosh,

<=
/p>
With regard to the questio=
n whether we should=C2=A0allow multi=
ple BFD sessions for the same VNI or not, IMHO we should allow it, more exp=
lanation as follows...
Below is a figure derived from f=
igure 2 of RFC8014 (An Architec=
ture for Data-Center Network Virtualization over Layer 3 (NVO3)).
                    |         Data Center=
 Network (IP)        |
                    |                                         |
                    +-----------------------------------------+
                         |                           |
                         |       Tunnel Overlay      |
            +------------+---------+       +---------+------------+
            | +----------+-------+ |       | +-------+----------+ |
            | |  Overlay Module  | |       | |  Overlay Module  | |
            | +---------+--------+ |       | +---------+--------+ |
            |           |          |       |           |          |
     NVE1   |           |          |       |           |          | NVE2
            |  +--------+-------+  |       |  +--------+-------+  |
            |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
            |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
            |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
            +----+-----+----+------+       +----+-----+-----+-----+
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
          -------+-----+----+-------------------+-----+-----+-------
                 |     |    |     Tenant        |     |     |
            TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
                +---+ +---+ +---+             +---+ +---+   +---+
                |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
                +---+ +---+ +---+             +---+ +---+   +---+
To my understanding, the BFD sess=
ions between NVE1 and NVE2 are actually initiated and terminated at VAP of =
NVE.
If the network operator want to set up one BFD ses=
sion between VAP1 of NVE1 and VAP1of NVE2, at the same time another BFD ses=
sion between VAP3 of NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same VNI1,=C2=
=A0I believe it's reasonable, so that's why I think we shoul=
d allow it.

Of course, in RFC8014 it also says:=

"Note that two different Tenant Systems (and TSIs) attached t=
o a common NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as t=
hey connect to the same Virtual Network.&=
quot;
Some people may argue that all Tenant Systems c=
onnecting to the same Virtual Network MUST share one VAP, if that's tru=
e, then VAP1 and VAP3 should merge into one VAP and my explanation doesn=
9;t work. Copying to NVO3 WG to involve more experts, hope for your clarifi=
cations and comments.

Best Reg=
ards,
Xiao Min

=



=



_____________=
__________________________________
nvo3 mailing list
nvo3@ietf.org
ht=
tps://www.ietf.org/mailman/listinfo/nvo3




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From: Anoop Ghanwani 
Date: Fri, 11 Oct 2019 08:59:24 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: xiao.min2@zte.com.cn
Cc: draft-ietf-bfd-vxlan@ietf.org, nvo3@ietf.org,  rtg-bfd WG 
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Hi Xiao Min,

Unless they are in the same broadcast domain (which does not appear to the
case) they would not be in the same VNI.

Anoop

On Fri, Oct 11, 2019 at 2:18 AM  wrote:

> Hi Anoop,
>
>
> In the use case illustrated in below figure, do you think Tenant System1
> and Tenant System2 can be within the same VN? do you think NVE1 and NVE2
> can encapsulate the same VNI in the packets sent from Tenant System1 and
> Tenant System2?
>
>             ................
>             .              .  +--+-+
>             .              .--|NVE1|
>             .              .  |    |
>             .              .  +--+-+
>             .              .     |
>             .  L3 Overlay  .   ( ' )
>             .    Network   .(IP Routing)
>             .              .   ( _ )
>             .              .     |
>             ................    +--------+
>                |                | Tenant |
>              +----+             | System1|
>              |NVE2|             +--------+
>              |    |
>              +----+
>                |
>              ( ' )
>           (IP Routing)
>              ( _ )
>                |
>            +--------+
>            | Tenant |
>            | System2|
>            +--------+
>
>
> Best Regards,
>
> Xiao Min
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*draft-ietf-bfd-vxlan@ietf.org ;
> nvo3@ietf.org ;rtg-bfd WG ;
> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8811=E6=97=A5 05:33
> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD C=
ontrol packet at VTEP*
> Hi Xiao Min,
> Can you provide more detail on your scenario?  I'm having trouble figurin=
g
> it out from the description below.  I need to know what subnets the tenan=
ts
> are in.
>
> Anoop
>
> On Thu, Oct 10, 2019 at 5:00 AM  wrote:
>
>> Hi Anoop,
>>
>>
>> Please see my response inline with [XM].
>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*draft-ietf-bfd-vxlan@ietf.org ;
>> nvo3@ietf.org ;rtg-bfd WG ;
>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8810=E6=97=A5 15:47
>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD =
Control packet at VTEP*
>> _______________________________________________
>> nvo3 mailing list
>> nvo3@ietf.org
>> https://www.ietf.org/mailman/listinfo/nvo3
>>
>> Hi Xiao Min,
>>
>> In those cases, the term "VN" is used to talk about multiple IP
>> interfaces in a VRF.  The different interfaces would have to be differen=
t
>> VNIs.
>>
>> [XM] To be clear, I interpret VNI as Virtual Network Identifier that
>> should be present within VxLAN/Geneve header. Do you mean in the case
>> multiple Tenant Systems connect to multiple NVEs through IP routing
>> network, different NVEs must encapsulate different Virtual Network
>> Identifiers?
>>
>> In the mixed case (with MPLS and L2 hitting the NVE at different VAPs),
>> I'm not sure how it would work in the same VNI.  If you think it's
>> important, I think it may be worth writing it up.  If there's enough mer=
it
>> in the use case, we can figure out how to run multiple BFD sessions on t=
he
>> same VNI.
>>
>> [XM] As to the mixed case, I don't know whether there's enough merit, I
>> just raise it for discussion because it seems not being prohibited from =
the
>> NVO3 architecture point of view.
>>
>>
>> Anoop
>>
>>
>> Best Regards,
>>
>> Xiao Min
>>
>>
>> On Wed, Oct 9, 2019 at 11:06 PM  wrote:
>>
>>> Hi Anoop,
>>>
>>>
>>> Normally, it is. While Tenant Systems connect to NVE through IP routing
>>> network or MPLS forwarding network, it is not.
>>>
>>>
>>> Best Regards,
>>>
>>> Xiao Min
>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*draft-ietf-bfd-vxlan@ietf.org ;
>>> nvo3@ietf.org ;rtg-bfd WG ;
>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8810=E6=97=A5 05:3=
3
>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BFD=
 Control packet at VTEP*
>>> Hi Xiao Min,
>>> Normally, I think of a VNI as a broadcast domain.  The only way I can
>>> make sense of the picture below is to have a separate VNI for each MPLS
>>> interface on the NVE.
>>>
>>> Anoop
>>>
>>> On Tue, Oct 8, 2019 at 11:09 PM >> > wrote:
>>>
>>>> Hi Anoop,
>>>>
>>>>
>>>> In this use case there is no forwarding happens between the MPLS and
>>>> non-MPLS parts, would this use case be prohibited?
>>>>
>>>> If the answer is yes, then I agree that all Tenant Systems attached to
>>>> a common NVE MUST share a VAP so long as they connect to the same VN,
>>>> although in RFC8014 it uses "can" but not "MUST". As a result, we shou=
ld
>>>> not allow multiple BFD sessions for the same VNI between two NVEs.
>>>>
>>>> If the answer is no, then we should allow multiple BFD sessions for
>>>> the same VNI between two NVEs. I personally lean to this answer.
>>>>
>>>>
>>>> Best Regards,
>>>>
>>>> Xiao Min
>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>> santosh...pallagatti@gmail.com  <
>>>> santosh.pallagatti@gmail.com>;rtg-bfd WG ;Joel M.
>>>> Halpern ;tsridhar@vmware.com >>> >;
>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8809=E6=97=A5 06:=
28
>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping BF=
D Control packet at VTEP*
>>>> Hi Xiao Min,
>>>> The picture doesn't have enough information to explain why they are in
>>>> the same VNI, and exactly how forwarding happens between the MPLS and
>>>> non-MPLS parts.
>>>>
>>>> Anoop
>>>>
>>>> On Tue, Oct 8, 2019 at 12:31 AM  wrote:
>>>>
>>>>> Hi Anoop,
>>>>>
>>>>>
>>>>> I don't know such a draft that describes MPLS over Geneve, but I
>>>>> believe the following figure derived from figure 1 of RFC8014 would h=
elp,
>>>>> in the following figure Tenant System1, Tenant System2, Tenant System=
3 and
>>>>> Tenant System4 are assumed belonging to the same VNI, so two BFD sess=
ions
>>>>> for the same VNI need to be run between NVE1 and NVE2.
>>>>>
>>>>>                                             +--------+
>>>>>                                        +----| Tenant |
>>>>>                                      ( ' )  | System1|
>>>>>             ................       ( MPLS ) +--------+
>>>>>             .              .  +--+-+ ( _ )
>>>>>             .              .--|NVE1|---+
>>>>>             .              .  |    |
>>>>>             .              .  +--+-+
>>>>>             .              .     |
>>>>>             .  L3 Overlay  .   ( ' )
>>>>>             .    Network   . (Ethernet)
>>>>>             .              .   ( _ )
>>>>>             .              .     |
>>>>>             ................    +--------+
>>>>>                |                | Tenant |
>>>>>              +----+             | System2|
>>>>>              |NVE2|             +--------+
>>>>>              |    |--------+
>>>>>              +----+        |
>>>>>                |           |
>>>>>              ( ' )       ( ' )
>>>>>            ( MPLS )    (Ethernet)
>>>>>              ( _ )       ( _ )
>>>>>                |           |
>>>>>            +--------+  +--------+
>>>>>            | Tenant |  | Tenant |
>>>>>            | System3|  | System4|
>>>>>            +--------+  +--------+
>>>>>
>>>>>
>>>>> Best Regards,
>>>>>
>>>>> Xiao Min
>>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani >
>>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail...com
>>>>>  ;draft-ietf-bfd-vxlan@ietf.org <
>>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>>> santosh.pallagatti@gmail.com ;rtg-bfd
>>>>> WG ;Joel M. Halpern ;
>>>>> tsridhar@vmware.com ;
>>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B410=E6=9C=8808=E6=97=A5 12=
:15
>>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping B=
FD Control packet at
>>>>> VTEP*
>>>>> Hi Xiao Min,
>>>>> Is there a draft that describes MPLS over Geneve?  It sounds like the
>>>>> NVE is an MPLS router in this case and if you're using the same VNI a=
s you
>>>>> switch MPLS, then it's a one-armed router.  That doesn't change how B=
FD
>>>>> needs to be run between NVEs.
>>>>>
>>>>> Anoop
>>>>>
>>>>> On Mon, Oct 7, 2019 at 7:28 PM  wrote:
>>>>>
>>>>>> Hi Anoop,
>>>>>>
>>>>>>
>>>>>> Sorry for the late response, I just come back from vacation.
>>>>>>
>>>>>> The use case is that the network between the VM and the NVE is an
>>>>>> MPLS network, within which the packet is forwarded basing on MPLS la=
bel,
>>>>>> but not Ethernet MAC address and/or 802.1Q VLAN. When two such kind =
of MPLS
>>>>>> networks need to communicate with each other, through a Geneve tunne=
l, the
>>>>>> encap I illustrated would be used.
>>>>>>
>>>>>>
>>>>>> Best Regards,
>>>>>>
>>>>>> Xiao Min
>>>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>>>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>>>> santosh.pallagatti@gmail.com ;rtg-bfd
>>>>>> WG ;Joel M. Halpern >>>>> >;tsridhar@vmware.com ;
>>>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8828=E6=97=A5 0=
5:36
>>>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping =
BFD Control packet at
>>>>>> VTEP*
>>>>>> Hi Xiao Min,
>>>>>> Thanks for the details about the encap but the use case is not
>>>>>> clear.  It might help if you explain why its necessary to map a phys=
ical
>>>>>> Ethernet port and/or 802.1Q VLAN to the same VNI as an MPLS packet w=
ithout
>>>>>> an L2 header.
>>>>>>
>>>>>> Thanks,
>>>>>> Anoop
>>>>>>
>>>>>> On Thu, Sep 26, 2019 at 7:50 PM  wrote:
>>>>>>
>>>>>>> Hi Anoop,
>>>>>>>
>>>>>>>
>>>>>>> Due to the fact that a variety of Tunnels could be used under the
>>>>>>> NVO3 architecture, as an example, below figure illustrates the
>>>>>>> format of MPLS packet over Geneve Tunnel.
>>>>>>>
>>>>>>>     0                   1                   2                   3
>>>>>>>     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+
>>>>>>>    |                                                               =
|
>>>>>>>    ~                      Outer Ethernet Header                    =
~
>>>>>>>    |                                                               =
|
>>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+
>>>>>>>    |                                                               =
|
>>>>>>>    ~                        Outer IPvX Header                      =
~
>>>>>>>    |                                                               =
|
>>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+
>>>>>>>    |                                                               =
|
>>>>>>>    ~                        Outer UDP Header                       =
~
>>>>>>>    |                                                               =
|
>>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+
>>>>>>>    |                                                               =
|
>>>>>>>    ~                          Geneve Header                        =
~
>>>>>>>    |                                                               =
|
>>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+<-+
>>>>>>>    |                                                               =
|  |
>>>>>>>    ~                         MPLS Label Stack                      =
~  M
>>>>>>>    |                                                               =
|  P
>>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+  L
>>>>>>>    |                                                               =
|  S
>>>>>>>    |                                                               =
|
>>>>>>>    ~                             Payload                           =
~  P
>>>>>>>    |                                                               =
|  K
>>>>>>>    |                                                               =
|  T
>>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+<-+
>>>>>>>    |                               FCS                             =
|
>>>>>>>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+
>>>>>>>
>>>>>>>
>>>>>>> Note that in NVO3 working group Greg and I have submitted an
>>>>>>> individual draft draft-xiao-nvo3-bfd-geneve, which is used to addre=
ss BFD
>>>>>>> over Geneve.
>>>>>>>
>>>>>>> The intention is to make the two drafts draft-ietf-bfd-vxlan and
>>>>>>> draft-xiao-nvo3-bfd-geneve aligned, that is to say, we try to defin=
e the
>>>>>>> identical mechanism for the common part of BFD over VxLAN Tunnel an=
d BFD
>>>>>>> over Geneve Tunnel. For the common part, draft-xiao-nvo3-bfd-geneve=
 would
>>>>>>> reference to draft-ietf-bfd-vxlan, and for the other part specific =
to
>>>>>>> Geneve, we'll define the specific mechanism in draft-xiao-nvo3-bfd-=
geneve.
>>>>>>>
>>>>>>>
>>>>>>> Hope that clarifies.
>>>>>>>
>>>>>>>
>>>>>>> Best Regards,
>>>>>>>
>>>>>>> Xiao Min
>>>>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com
>>>>>>>  ;
>>>>>>> draft-ietf-bfd-vxlan@ietf.org ;
>>>>>>> nvo3@ietf.org ;santosh.pallagatti@gmail.com <
>>>>>>> santosh.pallagatti@gmail.com>;rtg-bfd WG ;Joel M.
>>>>>>> Halpern ;tsridhar@vmware.com <
>>>>>>> tsridhar@vmware...com >;bfd-chairs@ietf.org <
>>>>>>> bfd-chairs@ietf.org>;
>>>>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5 =
23:16
>>>>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trapping=
 BFD Control packet at
>>>>>>> VTEP*
>>>>>>> Hi Xiao Min,
>>>>>>> I think we would need more detail around the use case below.  What
>>>>>>> does the MPLS packet over Tunnel look like?
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Anoop
>>>>>>>
>>>>>>> On Wed, Sep 25, 2019 at 11:37 PM  wrote:
>>>>>>>
>>>>>>>> Hi Anoop,
>>>>>>>>
>>>>>>>>
>>>>>>>> Thanks for your comments.
>>>>>>>>
>>>>>>>> Considering a scenario where TS1 has an MPLS access (i.e.
>>>>>>>> MPLS-Packet over Tunnel between NVEs) to VNI1, TS3 has an Ethernet=
 access
>>>>>>>> (i.e. MAC-Frame over Tunnel between NVEs) to VNI1, then how can TS=
1 and TS3
>>>>>>>> share one VAP?
>>>>>>>>
>>>>>>>>
>>>>>>>> Best Regards,
>>>>>>>>
>>>>>>>> Xiao Min
>>>>>>>> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>>>>>>>> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*AnoopGhanwani 
>>>>>>>> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
>>>>>>>> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*Greg Mirsky ;didutt@gmail.com <
>>>>>>>> didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <
>>>>>>>> draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org ;
>>>>>>>> santosh.pallagatti@gmail.com ;rtg-bf=
d
>>>>>>>> WG ;Joel M. Halpern ;
>>>>>>>> tsridhar@vmware.com ;bfd-chairs@ietf.org <
>>>>>>>> bfd-chairs@ietf.org>;
>>>>>>>> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2019=E5=B9=B409=E6=9C=8826=E6=97=A5=
 08:36
>>>>>>>> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Re: [nvo3] BFD over VXLAN: Trappin=
g BFD Control packet at
>>>>>>>> VTEP*
>>>>>>>> _______________________________________________
>>>>>>>> nvo3 mailing list
>>>>>>>> nvo3@ietf.org
>>>>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>>>>
>>>>>>>> >>>
>>>>>>>> Some people may argue that all Tenant Systems connecting to the
>>>>>>>> same Virtual Network MUST share one VAP, if that's true, then VAP1=
 and VAP3
>>>>>>>> should merge into one VAP and my explanation doesn't work. Copying=
 to NVO3
>>>>>>>> WG to involve more experts, hope for your clarifications and comme=
nts.
>>>>>>>> >>>
>>>>>>>>
>>>>>>>> I would be one of those that would argue that they MUST share on
>>>>>>>> VAP if they connect to the same Virtual Network.  IMO, the NVO3 ar=
ch doc
>>>>>>>> should have been clearer about this.
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Anoop
>>>>>>>>
>>>>>>>> On Tue, Sep 24, 2019 at 7:40 PM  wrote:
>>>>>>>>
>>>>>>>>> Hi Santosh,
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> With regard to the question whether we should allow multiple BFD
>>>>>>>>> sessions for the same VNI or not, IMHO we should allow it, more e=
xplanation
>>>>>>>>> as follows...
>>>>>>>>>
>>>>>>>>> Below is a figure derived from figure 2 of RFC8014 (An
>>>>>>>>> Architecture for Data-Center Network Virtualization over Layer 3 =
(NVO3)
>>>>>>>>> ).
>>>>>>>>>
>>>>>>>>>                     |         Data Center Network (IP)        |
>>>>>>>>>                     |                                         |
>>>>>>>>>                     +-----------------------------------------+
>>>>>>>>>                          |                           |
>>>>>>>>>                          |       Tunnel Overlay      |
>>>>>>>>>             +------------+---------+       +---------+-----------=
-+
>>>>>>>>>             | +----------+-------+ |       | +-------+----------+=
 |
>>>>>>>>>             | |  Overlay Module  | |       | |  Overlay Module  |=
 |
>>>>>>>>>             | +---------+--------+ |       | +---------+--------+=
 |
>>>>>>>>>             |           |          |       |           |         =
 |
>>>>>>>>>      NVE1   |           |          |       |           |         =
 | NVE2
>>>>>>>>>             |  +--------+-------+  |       |  +--------+-------+ =
 |
>>>>>>>>>             |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 | =
 |
>>>>>>>>>             |  +-+-----+----+---+  |       |  +-+-----+-----+--+ =
 |
>>>>>>>>>             |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP=
3|
>>>>>>>>>             +----+-----+----+------+       +----+-----+-----+----=
-+
>>>>>>>>>                  |     |    |                   |     |     |
>>>>>>>>>                  |     |    |                   |     |     |
>>>>>>>>>                  |     |    |                   |     |     |
>>>>>>>>>           -------+-----+----+-------------------+-----+-----+----=
---
>>>>>>>>>                  |     |    |     Tenant        |     |     |
>>>>>>>>>             TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>>>>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>>>>>>                 |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>>>>>>>                 +---+ +---+ +---+             +---+ +---+   +---+
>>>>>>>>>
>>>>>>>>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>>>>>> actually initiated and terminated at VAP of NVE.
>>>>>>>>>
>>>>>>>>> If the network operator want to set up one BFD session between
>>>>>>>>> VAP1 of NVE1 and VAP1of NVE2, at the same time another BFD sessio=
n between
>>>>>>>>> VAP3 of NVE1 and VAP3 of NVE2, although the two BFD sessions are
>>>>>>>>> for the same VNI1, I believe it's reasonable, so that's why I
>>>>>>>>> think we should allow it.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Of course, in RFC8014 it also says:
>>>>>>>>>
>>>>>>>>> "Note that two different Tenant Systems (and TSIs) attached to a =
common NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as they =
connect to the same Virtual Network."
>>>>>>>>>
>>>>>>>>> Some people may argue that all Tenant Systems connecting to the
>>>>>>>>> same Virtual Network MUST share one VAP, if that's true, then VAP=
1 and VAP3
>>>>>>>>> should merge into one VAP and my explanation doesn't work. Copyin=
g to NVO3
>>>>>>>>> WG to involve more experts, hope for your clarifications and comm=
ents.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Best Regards,
>>>>>>>>>
>>>>>>>>> Xiao Min
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>> _______________________________________________
>>>> nvo3 mailing list
>>>> nvo3@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>
>>>
>>>
>>
>

--000000000000cda3910594a49a90
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Xiao Min,

Unless they are in the sam=
e broadcast domain (which does not appear to the case) they would not be in=
 the same VNI.

Anoop

On Fri, Oct 11, 2019 at =
2:18 AM <xiao.min2@zte.com.cn> wrote:
Hi Anoop,

In the use case illustrated in below figure, do you think Tenant=
 System1 and Tenant System2 can be within the same VN? do you think NVE1 an=
d NVE2 can encapsulate the same VNI in the packets sent from Tenant System1=
 and Tenant System2?
            ................
            .              .  +--+-+
            .              .--|NVE1|
            .              .  |    |
            .              .  +--+-+
            .              .     |
            .  L3 Overlay  .   ( ' )
            .    Network   .(IP Routing)
            .              .   ( _ )
            .              .     |
            ................    +--------+
               |                | Tenant |
             +----+             | System1|
             |NVE2|             +--------+
             |    |
             +----+
               |
             ( ' )
          (IP Routing)
             ( _ )
               |
           +--------+
           | Tenant |
           | System2|
           +--------+
Best Regards,
Xiao Min
=E5=8E=9F=
=E5=A7=8B=E9=82=AE=E4=BB=B6
=E6=94=B6=E4=BB=
=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=
=95=8F10093570;
=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=
=9Adraft-ietf-bfd-vxlan@ietf.org <draft-ietf=
-bfd-vxlan@ietf.org>;nvo3@ietf.org <nvo3@ietf.org>;rtg-bfd WG <rtg-bfd@ietf.org>;
=
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=9C=8811=E6=
=97=A5 05:33
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VT=
EP
H=
i Xiao Min,
Can you provide more detail on your scenario?=C2=A0 I&#=
39;m having trouble figuring it out from the description below.=C2=A0 I nee=
d to know what subnets the tenants are in.

Anoop
<=
br>
On Thu,=
 Oct 10, 2019 at 5:00 AM <xiao.min2@zte.com.cn> wrote:
Hi Anoop,

Please see my response inlin=
e with [XM].
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani =
<anoop@alumni=
.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=9C=8810=E6=97=A5 15:47
=E4=B8=BB=
 =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BF=
D Control packet at VTEP
_________________________=
______________________
nvo3=C2=A0mailing=C2=A0list
nvo3@ietf.org
https://www.ietf.org/ma=
ilman/listinfo/nvo3

Hi Xiao Min,
In those=
 cases, the term "VN" is used to talk about multiple IP interface=
s in a VRF.=C2=A0 The different interfaces would have to be different VNIs.=

[XM] To be clear, I interpret VNI as Virtual Network Identifier that=
 should be present within VxLAN/Geneve header. Do you mean in the case mult=
iple Tenant Systems connect to multiple NVEs through IP routing network, di=
fferent NVEs must encapsulate different Virtual Network Identifiers?
In the mixed case (with MPLS and L2 hitting the NVE at different VAPs),=
 I'm not sure how it would work in the same VNI.=C2=A0 If you think it&=
#39;s important, I think it may be worth writing it up.=C2=A0 If there'=
s enough merit in the use case, we can figure out how to run multiple BFD s=
essions on the same VNI.
[XM] As to the mixed case, I don't know =
whether there's enough merit, I just raise it for discussion because it=
 seems not being prohibited from the NVO3 architecture point of view.

Anoop

Best Regards,
Xiao Min

On Wed, Oct 9, 2019 at 11:06 PM <xiao.min2@zte.com.cn> wrote:<=
br>
Hi Anoop,

No=
rmally, it is. While Ten=
ant Systems connect to NVE through IP routing network or MPLS forwarding ne=
twork, it is not.
<=
span style=3D"font-family:arial;line-height:21px">
Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=
=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=
=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=
=E8=82=96=E6=95=8F10093570;
=E6=8A=84=E9=80=81=E4=
=BA=BA=EF=BC=9Adraft-ietf-bfd-vxlan@ietf.or=
g <draft-ietf-bfd-vxlan@ietf.org>;nvo3@ietf.org <=
;nvo3@ietf.org>;<=
/span>rtg-bfd WG <rtg-bfd@ietf.org>;
<=
strong>=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=9C=8810=E6=
=97=A5 05:33
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
Hi Xiao Min,
=
Normally, I think of a VNI as a broadcast domain.=C2=A0 The only way I can =
make sense of the picture below is to have a separate VNI for each MPLS int=
erface on the NVE.

Anoop

On Tue, Oct 8, 2019 at 11:09 PM=
 <xiao...min2@=
zte.com.cn> wrote:
Hi Anoop,
=


In this use case there is no forwarding happen=
s between the MPLS and non-MPLS parts, would this use case be prohibited?
If the answer is yes, then =
I agree that all Tenant Systems attached to a common NVE MUST share a VAP s=
o long as they connect to the same VN, although in RFC8014 it uses "ca=
n" but not "MUST". As a result, we should not allow multiple=
 BFD sessions for the same VNI between two NVEs.
If the answer is no, then we should=C2=A0allow multiple BFD sessions for the same VNI between two NVEs. I personally lean to thi=
s answer.

<=
p style=3D"font-size:14px;font-family:arial">Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=
=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAn=
oopGhanwani <=
anoop@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=BA=
=EF=BC=9A=E8=82=96=E6=95=8F10093570=
;
=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9AGreg Mirsky <gregimirsky@gmail.com>;=
didutt@gmail.com <didutt@gmail.com>;draft-ietf-bfd-=
vxlan@ietf.org <draft-ietf-bfd-vxlan@ietf.org>;nvo3@iet=
f.org <nvo3@ietf.=
org>;santosh...pallagatti@gmail.com=
 <sant=
osh.pallagatti@gmail.com>;rtg-=
bfd WG <rtg-bfd@ie=
tf.org>;Joel M. Halpern <jmh@joelhalpern.com<=
/a>>;tsridhar@vmware.com <tsridhar@vmware.com>;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=
=9C=8809=E6=97=A5 06:28
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP=

Hi Xiao Min,
The pi=
cture doesn't have enough information to explain why they are in the sa=
me VNI, and exactly how forwarding happens between the MPLS and non-MPLS pa=
rts.

Anoop

On Tue, Oct 8, 2019 at 12:31 AM <xiao.min2@zte.com.cn=
> wrote:
Hi Anoop,

I don't know such a draft that describes MPLS over Geneve=
, but I believe the following figure derived from figure 1 of RFC8014 would=
 help, in the following figure Tenant System1, Tenant System2, Tenant Syste=
m3 and Tenant System4 are assumed belonging to the same VNI, so two BFD ses=
sions for the same VNI need to be run between NVE1 and NVE2.
      =
                                      +--------+
                                       +----| Tenant |
                                     ( ' )  | System1|
            ................       ( MPLS ) +--------+
            .              .  +--+-+ ( _ )
            .              .--|NVE1|---+
            .              .  |    |
            .              .  +--+-+
            .              .     |
            .  L3 Overlay  .   ( ' )
            .    Network   . (Ethernet)
            .              .   ( _ )
            .              .     |
            ................    +--------+
               |                | Tenant |
             +----+             | System2|
             |NVE2|             +--------+
             |    |--------+
             +----+        |
               |           |
             ( ' )       ( ' )
           ( MPLS )    (Ethernet)
             ( _ )       ( _ )
               |           |
           +--------+  +--------+
           | Tenant |  | Tenant |
           | System3|  | System4|
           +--------+  +--------+

Best Regard=
s,
Xiao Min
=E5=
=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni...duke.edu>=

=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
=E6=97=A5=
 =E6=9C=9F =EF=BC=9A2019=E5=B9=B410=E6=9C=8808=E6=97=A5 12:15
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3] BFD =
over VXLAN: Trapping BFD Control packet at VTEP
Hi Xiao Min,
Is there a draft =
that describes MPLS over Geneve?=C2=A0 It sounds like the NVE is an MPLS ro=
uter in this case and if you're using the same VNI as you switch MPLS, =
then it's a one-armed router.=C2=A0 That doesn't change how BFD nee=
ds to be run between NVEs.

Anoop

On Mon, Oct 7, 2019 at =
7:28 PM <xiao.=
min2@zte.com.cn> wrote:
Hi Anoop,=


Sorry for the late response, I just come back =
from vacation.
The use cas=
e is that the network between the VM and the NVE is an MPLS network, within=
 which the packet is forwarded basing on MPLS label, but not Ethernet MAC a=
ddress and/or 802.1Q VLAN. When two such kind of MPLS networks need to comm=
unicate with each other, through a Geneve tunnel, the encap I illustrated w=
ould be used.

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=
=E9=82=AE=E4=BB=B6
=

=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AAnoopGhanwani <anoop@alumni.duke.edu>
=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9AGreg Mirsky <gregimirsky@gmail.com>;didutt@gmail.com &l=
t;didutt@gmail.com>;draft-ietf-bfd-vxlan@ietf.org <<=
a href=3D"mailto:draft-ietf-bfd-vxlan@ietf.org" target=3D"_blank">draft-iet=
f-bfd-vxlan@ietf.org>;nvo3@ietf.org <nvo3@ietf.org>;santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.co=
m>;rtg-bfd WG <rtg-bfd@ietf.org>;<=
span style=3D"display:inline">Joel M. Halpern <jmh@joelhalpern...com>;tsridhar@vmware.com <tsridhar@vmware.com>;
=E6=
=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=9C=8828=E6=97=A5 05:3=
6
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: [nvo3=
] BFD over VXLAN: Trapping BFD Control packet at VTEP
<=
div>
Hi Xiao Min,
Thanks for =
the details about the encap but the use case is not clear.=C2=A0 It might h=
elp if you explain why its necessary to map a physical Ethernet port and/or=
 802.1Q VLAN to the same VNI as an MPLS packet without an L2 header.
<=
br>
Thanks,
Anoop

<=
div dir=3D"ltr" class=3D"gmail_attr">On Thu, Sep 26, 2019 at 7:50 PM <xiao.min2@zte.com.c=
n> wrote:
Hi Anoop,

Due to the fact that=C2=A0a variety of Tunnels could be us=
ed under the NVO3 architecture,=
 as an example, below figure illustrates the format of MPLS packet over Gen=
eve Tunnel.
    0                 =
  1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                      Outer Ethernet Header                    ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer IPvX Header                      ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                        Outer UDP Header                       ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   ~                          Geneve Header                        ~
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                                                               |  |
   ~                         MPLS Label Stack                      ~  M
   |                                                               |  P
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+  L
   |                                                               |  S
   |                                                               |
   ~                             Payload                           ~  P
   |                                                               |  K
   |                                                               |  T
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<-+
   |                               FCS                             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
<=
p style=3D"font-size:14px;font-family:arial">

Note that in NVO3 working group Greg=
 and I have submitted an individual draft draft-xiao-nvo3-bfd-geneve, which=
 is used to address BFD over Geneve.
The intention is to make the two=
 drafts draft-ietf-bfd-vxlan and draft-xiao-nvo3-bfd-geneve aligned, that i=
s to say, we try to define the identical mechanism for the common part of B=
FD over VxLAN Tunnel and BFD over Geneve Tunnel. For the common part, draft=
-xiao-nvo3-bfd-geneve would reference to draft-ietf-bfd-vxlan, and for the =
other part specific to Geneve, we'll define the specific mechanism in d=
raft-xiao-nvo3-bfd-geneve.

Hope that clarifies.

=

Best Regards,
Xiao Min
=E5=8E=9F=E5=A7=8B=E9=
=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AA=
noopGhanwani <anoop@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=
=BA=EF=BC=9A=E8=82=96=E6=95=8F10093=
570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=9C=8826=E6=97=
=A5 23:16
=E4=B8=BB =E9=A2=98 =EF=BC=9AR=
e: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
Hi Xiao Min,
I t=
hink we would need more detail around the use case below.=C2=A0 What does t=
he MPLS packet over Tunnel look like?

Thanks,
Anoop=


On Wed, Sep 25, 2019 at 11:37 PM <xiao.min2@zte.com.cn> wrote:
Hi Anoop,

Thanks for your=
 comments.
Considering a s=
cenario where TS1 has an MPLS access (i.e. MPLS-Packet over Tunnel between =
NVEs) to VNI1, TS3 has an Ethernet access (i.e. MAC-Frame over Tunnel betwe=
en NVEs) to VNI1, then how can TS1 and TS3 share one VAP?

Best Regards,
X=
iao Min
=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9AA=
noopGhanwani <anoop@alumni.duke.edu>
=E6=94=B6=E4=BB=B6=E4=BA=
=BA=EF=BC=9A=E8=82=96=E6=95=8F10093=
570;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=9C=8826=E6=97=A5=
 08:36
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: =
[nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
_______________________________________________
nvo3=C2=A0=
mailing=C2=A0list
nvo=
3@ietf.org
https://www.ietf.org/mailman/listinfo/nvo3

>>>
Some people=
 may argue that all Tenant Systems connecting to the same Virtual Network M=
UST share one VAP, if that's true, then VAP1 and VAP3 should merge into=
 one VAP and my explanation doesn't work. Copying to NVO3 WG to involve=
 more experts, hope for your clarifications and comments.=C2=A0=C2=A0
>>>

I would be one of those tha=
t would argue that they MUST share on VAP if they connect to the same Virtu=
al Network.=C2=A0 IMO, the NVO3 arch doc should have been clearer about thi=
s.

Thanks,
Anoop

On Tue, Sep 24, 2019 at 7:40 PM <=
;xiao.min2@zte.co=
m.cn> wrote:
Hi Santosh,

With regard to the question whether we should=C2=A0allow multiple BFD sessions for the same=
 VNI or not, IMHO we should allow it, more explanation as follows...=

Below is a figure derived from figure 2 of RFC8014 (An Architecture for Data-Center Network =
Virtualization over Layer 3 (NVO3)).
=

                    |         Data Center Network (IP)        |
                    |                                         |
                    +-----------------------------------------+
                         |                           |
                         |       Tunnel Overlay      |
            +------------+---------+       +---------+------------+
            | +----------+-------+ |       | +-------+----------+ |
            | |  Overlay Module  | |       | |  Overlay Module  | |
            | +---------+--------+ |       | +---------+--------+ |
            |           |          |       |           |          |
     NVE1   |           |          |       |           |          | NVE2
            |  +--------+-------+  |       |  +--------+-------+  |
            |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
            |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
            |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
            +----+-----+----+------+       +----+-----+-----+-----+
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
                 |     |    |                   |     |     |
          -------+-----+----+-------------------+-----+-----+-------
                 |     |    |     Tenant        |     |     |
            TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
                +---+ +---+ +---+             +---+ +---+   +---+
                |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
                +---+ +---+ +---+             +---+ +---+   +---+
To my understanding, the BFD sess=
ions between NVE1 and NVE2 are actually initiated and terminated at VAP of =
NVE.
If the network operator want to set up one BFD ses=
sion between VAP1 of NVE1 and VAP1of NVE2, at the same time another BFD ses=
sion between VAP3 of NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same VNI1,=C2=
=A0I believe it's reasonable, so that's why I think we shoul=
d allow it.

Of course, in RFC8014 it also says:=

"Note that two different Tenant Systems (and TSIs) attached t=
o a common NVE can share a VAP (e.g., TS1 and TS2 in Figure 2) so long as t=
hey connect to the same Virtual Network.&=
quot;
Some people may argue that all Tenant Systems c=
onnecting to the same Virtual Network MUST share one VAP, if that's tru=
e, then VAP1 and VAP3 should merge into one VAP and my explanation doesn=
9;t work. Copying to NVO3 WG to involve more experts, hope for your clarifi=
cations and comments.

Best Reg=
ards,
Xiao Min

=



=



_____________=
__________________________________
nvo3 mailing list
nvo3@ietf.org
ht=
tps://www.ietf.org/mailman/listinfo/nvo3





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Date: Fri, 11 Oct 2019 21:53:01 -0400
Subject: PIM BFD RFC
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BFD WG

Anyone know what the RFC or draft for PIM BFD support.

Thank you

Gyan 
Verizon Communications 



Sent from my iPhone


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Greg 

I saw your draft on PIM BFD use cases but could not find the RFC on PIM BFD.


https://tools.ietf.org/id/draft-mirsky-pim-bfd-p2mp-use-case-02.html

Thanks 

Gyan
Verizon Communications 
Cell-301 502-1347


Sent from my iPhone

> On Oct 11, 2019, at 9:53 PM, Gyan Mishra  wrote:
> 
> 
> BFD WG
> 
> Anyone know what the RFC or draft for PIM BFD support.
> 
> Thank you
> 
> Gyan 
> Verizon Communications 
> 
> 
> 
> Sent from my iPhone

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Greg 

I saw your dr=
aft on PIM BFD use cases but could not find the RFC on PIM BFD.


G=
yan
Verizon Communications 
Cell-301 502-1347
=



Sent from=
 my iPhone

On Oct 11, 2019, at 9:53 PM, Gyan Mishr=
a <hayabusagsm@gmail.com>=
 wrote:


BFD WG

Anyone know what the RFC o=
r draft for PIM BFD support.

Thank you

Gyan 
Verizon Communications 



Sent from m=
y iPhone
=

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In-Reply-To: 
From: Greg Mirsky 
Date: Fri, 11 Oct 2019 21:07:03 -0700
Message-ID: 
Subject: Re: PIM BFD RFC
To: Gyan Mishra 
Cc: rtg-bfd WG 
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Hi Gyan,
thank you for your interest in this draft. We've described how RFC 8562 BFD
for Multipoint Networks  can be
used to shorten convergence in PIM-SM. The similar scenario discussed in
draft-ietf-bess-mvpn-fast-failover
 where
p2mp BFD is used by tails to detect the failure of the head/root or the
multicast tree. If it is required for the head/root to detect a defect of
the multicast tree toward a tail, we'll turn to RFC 8563 BFD for
Multipoint  Active Tails  as in
draft-hu-bier-bfd .
Hope this information would be helpful to you. I always welcome your
questions.

Regards,
Greg

On Fri, Oct 11, 2019 at 7:40 PM Gyan Mishra  wrote:

> Greg
>
> I saw your draft on PIM BFD use cases but could not find the RFC on PIM
> BFD.
>
>
> https://tools.ietf.org/id/draft-mirsky-pim-bfd-p2mp-use-case-02.html
>
> Thanks
>
> Gyan
> Verizon Communications
> Cell-301 502-1347
>
>
> Sent from my iPhone
>
> On Oct 11, 2019, at 9:53 PM, Gyan Mishra  wrote:
>
>
> BFD WG
>
> Anyone know what the RFC or draft for PIM BFD support.
>
> Thank you
>
> Gyan
> Verizon Communications
>
>
>
> Sent from my iPhone
>
>

--000000000000053da20594aec543
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Gyan,
thank you for your interest in this draft. We=
've described how RFC 8562 BFD for Multipoint Networks=C2=A0can be used to shorten=C2=A0=
convergence in PIM-SM. The similar scenario discussed in draft-ietf-b=
ess-mvpn-fast-failover=C2=A0where p2mp BFD is used by tails to detect t=
he failure of the head/root or the multicast tree. If it is required for th=
e head/root to detect a defect of the multicast tree toward a tail, we'=
ll turn to RFC 8563 B=
FD for Multipoint=C2=A0 Active Tails=C2=A0as in draft-hu-bier-bfd.
H=
ope this information would be helpful to you. I always welcome your questio=
ns.

Regards,
Greg

On Fri, Oct 11, 2=
019 at 7:40 PM Gyan Mishra <hay=
abusagsm@gmail.com> wrote:
Greg=C2=A0

I saw you=
r draft on PIM BFD use cases but could not find the RFC on PIM BFD.


https://tools.ietf=
.org/id/draft-mirsky-pim-bfd-p2mp-use-case-02.html

Thanks=C2=A0<=
/div>

Gyan
Verizon Communications=C2=A0
<=
div>Cell-301 502-1347


Sent from my iPhone

On Oct 11, 2019, at 9:53 PM, Gyan Mishra <hayabusagsm@gmail.com>=
; wrote:


BFD WG

Anyone know what the R=
FC or draft for PIM BFD support.

Thank you=


Gyan 
Verizon Communicati=
ons 



Sen=
t from my iPhone


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From: Gyan Mishra 
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Subject: Re: PIM BFD RFC
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Date: Wed, 16 Oct 2019 00:10:25 -0400
Cc: rtg-bfd WG , xu.benchong@zte.com.cn, mankamis@cisco.com
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References: <37FED5C8-F400-4C72-B72E-0552AD398895@gmail.com>  
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Greg=20

+ Mankamana and Benchon=20

...from PIM WG & BESS which owns LSM MVPN mLDP / P2MP TE S-PMSI and MI-PMSI.=


We were discussing PIM BFD use case on this BFD WG thread  and  RFC 8562 and=
 RFC 8563 covers strictly L3 VPN LSM ( label switched Multicast) LMDT (label=
ed multicast distribution tree) mLDP / P2MP p-tree S-PMSI ( selective constr=
ained MDT / Cisco data MDT) MI-PMSI(inclusive MDT for all VRFs) and not Ethe=
rnet switching LAN based PIM SM BFD.

We have a new draft in the PIM WG PIM DRLB load balancing GDR capability and=
 the draft of hashing of ASM PIM RP hash and ASM and SSM S,G hash load balan=
cing of traffic across both PIM DR/BDR does significantly help with converge=
nce as 50/50 LB split but during failover you still have 50% of the traffic t=
hat still has to reconverge and SPT tree MRIB/MFIB state has to rebuild. =20=



https://tools.ietf.org/html/draft-ietf-pim-drlb-11


So the BFD PIM Draft would register the PIM protocol and in asynchronous mod=
e with echo disabled we can achieve sub millisecond detection time and conve=
rgence during failover.

So I do think we need a PIM BFD Draft.=20

Since this falls between multiple WG but since BFD related this would be und=
er the BFD WG.

I am part of the BFD WG as well as part of PIM and BESS so I can assist in w=
riting the draft if we are all in agreement that this is needed and can work=
 with Mankamana and Benchon as well in creating the draft.

Gyan

Sent from my iPhone

> On Oct 12, 2019, at 12:07 AM, Greg Mirsky  wrote:
>=20
> Hi Gyan,
> thank you for your interest in this draft. We've described how RFC 8562 BFD=
 for Multipoint Networks can be used to shorten convergence in PIM-SM. The s=
imilar scenario discussed in draft-ietf-bess-mvpn-fast-failover where p2mp B=
FD is used by tails to detect the failure of the head/root or the multicast t=
ree. If it is required for the head/root to detect a defect of the multicast=
 tree toward a tail, we'll turn to RFC 8563 BFD for Multipoint  Active Tails=
 as in draft-hu-bier-bfd.
> Hope this information would be helpful to you. I always welcome your quest=
ions.
>=20
> Regards,
> Greg
>=20
>> On Fri, Oct 11, 2019 at 7:40 PM Gyan Mishra  wrote=
:
>> Greg=20
>>=20
>> I saw your draft on PIM BFD use cases but could not find the RFC on PIM B=
FD.
>>=20
>>=20
>> https://tools.ietf.org/id/draft-mirsky-pim-bfd-p2mp-use-case-02.html
>>=20
>> Thanks=20
>>=20
>> Gyan
>> Verizon Communications=20
>> Cell-301 502-1347
>>=20
>>=20
>> Sent from my iPhone
>>=20
>>> On Oct 11, 2019, at 9:53 PM, Gyan Mishra  wrote:
>>>=20
>>>=20
>>> BFD WG
>>>=20
>>> Anyone know what the RFC or draft for PIM BFD support.
>>>=20
>>> Thank you
>>>=20
>>> Gyan=20
>>> Verizon Communications=20
>>>=20
>>>=20
>>>=20
>>> Sent from my iPhone

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Greg 
+ Mankamana and Benchon 

...from PIM WG &=
; BESS which owns LSM MVPN mLDP / P2MP TE S-PMSI and MI-PMSI.

=

We were discussing PIM BFD use case on this BFD WG thread  and &nb=
sp;RFC 8562 and RFC 8563 covers strictly L3 VPN LSM ( label switched Multica=
st) LMDT (labeled multicast distribution tree) mLDP / P2MP p-tree S-PMSI ( s=
elective constrained MDT / Cisco data MDT) MI-PMSI(inclusive MDT for all VRFs=
) and not Ethernet switching LAN based PIM SM BFD.

=
We have a new draft in the PIM WG PIM DRLB load balancing GDR capability and=
 the draft of hashing of ASM PIM RP hash and ASM and SSM S,G hash load balan=
cing of traffic across both PIM DR/BDR does significantly help with converge=
nce as 50/50 LB split but during failover you still have 50% of the traffic t=
hat still has to reconverge and SPT tree MRIB/MFIB state has to rebuild. &nb=
sp;




So the BFD PIM Draft would register the PIM protocol and in asynchron=
ous mode with echo disabled we can achieve sub millisecond detection time an=
d convergence during failover.

So I do think we nee=
d a PIM BFD Draft. 

Since this falls between m=
ultiple WG but since BFD related this would be under the BFD WG.
<=
br>
I am part of the BFD WG as well as part of PIM and BESS so I c=
an assist in writing the draft if we are all in agreement that this is neede=
d and can work with Mankamana and Benchon as well in creating the draft.

=

Gyan

Sent from my iPhone<=
/div>

On Oct 12, 2019, at 12:07 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Gy=
an,
thank you for your interest in this draft. We've described how RFC 8562 BFD for Multipoint=
 Networks can be used to shorten convergence in PIM-SM. The si=
milar scenario discussed in draft-ietf-bess-mvpn-fast-failover =
;where p2mp BFD is used by tails to detect the failure of the head/root or t=
he multicast tree. If it is required for the head/root to detect a defect of=
 the multicast tree toward a tail, we'll turn to RFC 8563 BFD for Multipoint  Active Tails as in draft-hu-bier-bfd.
Hope this information would be helpful to y=
ou. I always welcome your questions.

Regards,
=

Greg

On Fri, Oct 11, 2019 at 7:40 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:
Greg 
I saw your draft on PIM BFD use cases but could not find th=
e RFC on PIM BFD.





BFD WG

Anyone k=
now what the RFC or draft for PIM BFD support.

Thank you

Gyan 
Verizon=
 Communications 


Sent from my iPhone


=

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From: Gyan Mishra 
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Subject: Re: Working Group Last Call on BFD Authentication Documents (expiresSeptember 13, 2019)
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Date: Wed, 16 Oct 2019 00:14:20 -0400
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I support all 3 drafts as they are useful security enhancements to BFD.

Thank you=20


Gyan Mishra=20
IT Network Engineering & Technology=20
Verizon Communications Inc. (VZ)
13101 Columbia Pike FDC1 3rd Floor
Silver Spring, MD 20904
United States
Phone: 301 502-1347
Email: gyan.s.mishra@verizon.com
www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT

Sent from my iPhone

> On Sep 15, 2019, at 10:28 PM,   wrote:
>=20
> Hi all,
>=20
>=20
>=20
> I support all the three drafts to be published. They're useful enhancement=
s to base BFD protocol, short and well-written.
>=20
>=20
>=20
> BRs,
>=20
> Xiao Min
>=20
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9ASantoshPK 
> =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9AAshesh Mishra ;
> =E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9Artg-bfd@ietf.org ;
> =E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=9C=8813=E6=97=A5 01:10
> =E4=B8=BB =E9=A2=98 =EF=BC=9ARe: Working Group Last Call on BFD Authentica=
tion Documents (expiresSeptember 13, 2019)
> I support all three documents.=20
>=20
>> On Wed, Sep 11, 2019 at 9:22 AM Ashesh Mishra =
 wrote:
>> As author, I support all three drafts.=20
>>=20
>> On Sep 10, 2019, at 7:13 PM, Manav Bhatia  wrote:
>>=20
>> I support all 3 documents.
>>=20
>>> On Tue, Aug 27, 2019 at 8:45 PM Jeffrey Haas  wrote:
>>> Working Group,
>>>=20
>>> As we discussed in Montreal at IETF-105, the last hang up on progressing=
 the
>>> authentication documents (thread copied below) was concerns on the IPR
>>> against them.
>>>=20
>>> The holder of the IPR believes their discloures are consistent with prio=
r
>>> IPR posted against the BFD suite of published RFCs.o
>>>=20
>>> We are thus proceeding with the Working Group Last Call for these docume=
nts....
>>> You are encouraged to provide technical feedback for the contents of the=

>>> documents, which addresses providing stronger authentication on the BFD
>>> protocol. =20
>>>=20
>>> Please indicate whether you believe these documents should be advanced t=
o
>>> the IESG for publication as RFCs.
>>>=20
>>> -- Jeff and Reshad
>>>=20
>>>=20
>>> On Tue, Jul 02, 2019 at 02:37:15PM -0400, Jeffrey Haas wrote:
>>> > Working Group,
>>> >=20
>>> > A followup on this item.
>>> >=20
>>> > Currently, the status is identical to that which was last posted.  Mah=
esh
>>> > did make contact with Ciena IPR holders regarding the state of the lic=
ense.
>>> > It is their belief that their disclosure is consistent with similar IP=
R
>>> > filed against BFD.  Citing two similar ones:
>>> >=20
>>> > https://datatracker.ietf.org/ipr/516/
>>> > https://datatracker.ietf.org/ipr/1419/
>>> >=20
>>> > It also appears to be their belief that the current wording doesn't re=
quire
>>> > that a license fee is due.  However, this is private commentary.
>>> >=20
>>> > At this point, my recommendation to the working group is we decide if w=
e'll
>>> > proceed with the publication process.  Let's use this time prior to IE=
TF 105
>>> > to discuss any pending issues on these documents.
>>> >=20
>>> > -- Jeff
>>> >=20
>>> > On Sat, Feb 16, 2019 at 12:07:40PM -0500, Jeffrey Haas wrote:
>>> > > Working Group,
>>> > >=20
>>> > > On March 28, 2018, we started Working Group Last Call on the followi=
ng document
>>> > > bundle:
>>> > >=20
>>> > >   draft-ietf-bfd-secure-sequence-numbers
>>> > >   draft-ietf-bfd-optimizing-authentication
>>> > >   draft-ietf-bfd-stability
>>> > >=20
>>> > > The same day, Mahesh Jethanandani acknowledged there was pending IPR=

>>> > > declarations against these drafts.  An IPR declaration was finally p=
osted on
>>> > > November 1, 2018.  In particular, it notes a patent.  The licenseing=
 is
>>> > > RAND. =20
>>> > >=20
>>> > > https://datatracker.ietf.org/ipr/3328/
>>> > >=20
>>> > > In the time since the WGLC was requested, there were a number of tec=
hnical
>>> > > comments made on these drafts.  It's my belief that all substantial
>>> > > technical comments had been addressed in the last posted version of t=
hese
>>> > > documents.  Note that there was one lingering comment about Yang
>>> > > considerations for the BFD module with regard to enabling this optim=
ized
>>> > > authentication mode which can be dealt with separably.
>>> > >=20
>>> > > The chairs did not carry out a further consensus call to ensure that=
 there
>>> > > are no further outstanding technical issues.
>>> > >=20
>>> > > On November 21, Greg Mirsky indicated an objection to progressing th=
e
>>> > > document due to late disclosure.
>>> > >=20
>>> > > https://mailarchive.ietf.org/arch/msg/rtg-bfd/u8rvWwvDWRKI3jseGHecAB=
9WtDo
>>> > >=20
>>> > > Since we are a little over a month prior to the upcoming IETF 104, t=
his
>>> > > seems a good time to try to decide how the Working Group shall finis=
h this
>>> > > work.  Since we are meeting in Prague, this may progress to micropho=
ne
>>> > > conversation.
>>> > >=20
>>> > > For the moment, the chairs' perceived status of the documents are:
>>> > > - No pending technical issues with the documents with one known issu=
e.
>>> > > - Concerns over late disclosure of IPR.
>>> > > - No solid consensus from the Working Group that we're ready to proc=
eed.
>>> > >   This part may be covered by a future consensus call, but let's hea=
r list
>>> > >   discussion first.
>>> > >=20
>>> > > -- Jeff
>>>=20
>=20
>=20

--Apple-Mail-8D136355-AD13-4E4B-886C-945205C43690
Content-Type: text/html;
	charset=utf-8
Content-Transfer-Encoding: quoted-printable



I support all 3 drafts as th=
ey are useful security enhancements to BFD.

Thank you&nbs=
p;


=
Gyan Mishra 
IT Network Engineering & Technology 
Verizon Communications Inc.=
 (VZ)
13101 Columbia=
 Pike FDC1 3rd Floor
Silver Sp=
ring, MD 20904
United States=

Phone: =
;301 502-1347
Email: gyan.s.mishra@verizon.co=
m
www.linkedin.com/in/=
GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT

Sent from my iPhone

On Sep 15, 2019, a=
t 10:28 PM, <xiao.min2@zte.com.cn=
> <xiao.min2@zte.com.cn> wrote:

=E5=8E=9F=E5=A7=8B=E9=
=82=AE=E4=BB=B6
=E6=
=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9AAshesh Mishra <mishra.ashesh@outlook.com>;
=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9Artg-bfd@ietf.org <rtg-b=
fd@ietf.org>;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2019=E5=B9=B409=E6=
=9C=8813=E6=97=A5 01:10
=E4=B8=BB =E9=A2=98 =EF=BC=9ARe: Working Group Last Call on BFD Authentication Documents (expiresSe=
ptember 13, 2019)
I suppor=
t all three documents. 

On Wed, Sep 11, 2019 at 9:22 AM Ashesh Mishra <=
;mishra.ashes=
h@outlook.com> wrote:
As auth=
or, I support all three drafts. 

On Sep 10, 2=
019, at 7:13 PM, Manav Bhatia <manavbhatia@gmail.com> wrote:

I support all 3 documents.

On Tue, Aug 27, 2019 at 8:45=
 PM Jeffrey Haas <jha=
as@pfrc.org> wrote:
Working Group,

As we discussed in Montreal at IETF-105, the la=
st hang up on progressing the
authentication documents (thread copied bel=
ow) was concerns on the IPR
against them.

The holder of the IPR be=
lieves their discloures are consistent with prior
IPR posted against the B=
FD suite of published RFCs.o

We are thus proceeding with the Working G=
roup Last Call for these documents....
You are encouraged to provide tech=
nical feedback for the contents of the
documents, which addresses providi=
ng stronger authentication on the BFD
protocol.  

Please indi=
cate whether you believe these documents should be advanced to
the IESG f=
or publication as RFCs.

-- Jeff and Reshad


On Tue, Jul 02,=
 2019 at 02:37:15PM -0400, Jeffrey Haas wrote:
> Working Group,
>=
; 
> A followup on this item.
> 
> Currently, the status i=
s identical to that which was last posted.  Mahesh
> did make con=
tact with Ciena IPR holders regarding the state of the license.
> It i=
s their belief that their disclosure is consistent with similar IPR
> f=
iled against BFD.  Citing two similar ones:
> 
> https://datatracker.ietf.org/ipr/516/
> https://datat=
racker.ietf.org/ipr/1419/
> 
> It also appears to be their b=
elief that the current wording doesn't require
> that a license fee is=
 due.  However, this is private commentary.
> 
> At this po=
int, my recommendation to the working group is we decide if we'll
> pr=
oceed with the publication process.  Let's use this time prior to IETF 1=
05
> to discuss any pending issues on these documents.
> 
>=
; -- Jeff
> 
> On Sat, Feb 16, 2019 at 12:07:40PM -0500, Jeffrey=
 Haas wrote:
> > Working Group,
> > 
> > On March=
 28, 2018, we started Working Group Last Call on the following document
&=
gt; > bundle:
> > 
> >   draft-ietf-bfd-secur=
e-sequence-numbers
> >   draft-ietf-bfd-optimizing-authen=
tication
> >   draft-ietf-bfd-stability
> > 
=
> > The same day, Mahesh Jethanandani acknowledged there was pending I=
PR
> > declarations against these drafts.  An IPR declaration w=
as finally posted on
> > November 1, 2018.  In particular, it n=
otes a patent.  The licenseing is
> > RAND.  
> >=
; 
> > https://datatracker.ietf.org/ipr/3328/
&g=
t; > 
> > In the time since the WGLC was requested, there were a=
 number of technical
> > comments made on these drafts.  It's m=
y belief that all substantial
> > technical comments had been addre=
ssed in the last posted version of these
> > documents.  Note t=
hat there was one lingering comment about Yang
> > considerations f=
or the BFD module with regard to enabling this optimized
> > authen=
tication mode which can be dealt with separably.
> > 
> > T=
he chairs did not carry out a further consensus call to ensure that there> > are no further outstanding technical issues.
> > 
>=
; > On November 21, Greg Mirsky indicated an objection to progressing the=

> > document due to late disclosure.
> > 
> > https://mailarchive.ietf.org/ar=
ch/msg/rtg-bfd/u8rvWwvDWRKI3jseGHecAB9WtDo
> > 
> > Si=
nce we are a little over a month prior to the upcoming IETF 104, this
>=
; > seems a good time to try to decide how the Working Group shall finish=
 this
> > work.  Since we are meeting in Prague, this may prog=
ress to microphone
> > conversation.
> > 
> > For=
 the moment, the chairs' perceived status of the documents are:
> >=
 - No pending technical issues with the documents with one known issue.
&=
gt; > - Concerns over late disclosure of IPR.
> > - No solid con=
sensus from the Working Group that we're ready to proceed.
> > =
;  This part may be covered by a future consensus call, but let's hear l=
ist
> >   discussion first.
> > 
> > --=
 Jeff

<=
/div>

=

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From: Gyan Mishra 
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Subject: Re: WGLC for draft-ietf-bfd-large-packets
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Date: Wed, 16 Oct 2019 00:46:51 -0400
Cc: Jeffrey Haas , "Reshad Rahman (rrahman)" , "rtg-bfd@ietf.org" 
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To: "Les Ginsberg (ginsberg)" 
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In-line comment
Sent from my iPhone

> On Oct 3, 2019, at 8:02 PM, Les Ginsberg (ginsberg)  w=
rote:
>=20
> Jeff -
>=20
> For some reason this is proving to be harder than I think it should be.
>=20
> I keep thinking I am being transparent - yet you keep reading "ulterior mo=
tives" into what I say.
> There are no ulterior motives.
>=20
> Let me try again...inline...
>=20
>> -----Original Message-----
>> From: Jeffrey Haas 
>> Sent: Thursday, October 03, 2019 1:13 PM
>> To: Les Ginsberg (ginsberg) 
>> Cc: Ketan Talaulikar (ketant) ; Reshad Rahman
>> (rrahman) ; rtg-bfd@ietf.org
>> Subject: Re: WGLC for draft-ietf-bfd-large-packets
>>=20
>> Les,
>>=20
>> On Fri, Sep 27, 2019 at 09:14:08PM +0000, Les Ginsberg (ginsberg) wrote:
>>>> The primary reason this is a "may" in the non-RFC 2119 sense is that ou=
r
>>>> experience also suggests that when the scaling impacts are primarily pp=
s
>>>> rather than bps that this feature will likely have no major impact on
>>>> implementations beyond your valid concerns about exercising bugs.
>>>>=20
>>>> I suspect had this not been mentioned at all, you would have been
>> happier.
>>>> But you're not the target audience for this weak caveat.
>>>=20
>>> [Les:] I am not opposed to a discussion of potential issues in the draft=
 -
>>> rather I am encouraging it. But the current text isn't really on the mar=
k
>>> as far as potential issues - and we seem to agree on that. It also
>>> suggests lengthening detection time to compensate - which I think is not=

>>> at all what you want to suggest as it diminishes the value of the
>>> extension. It also isn't likely to address a real problem.
>>=20
>> I think what I'm seeing from you is roughly:
>> - Note that larger MTUs may have impact on some implementations for BFD
>>  throughput.
>> - And simply stop there.
> [Les:] What I would like to see discussed are points "a" and "b" below.
> This is a section on deployment issues - not a normative part of the spec.=

>=20
>>> For me, the potential issues are:
>>>=20
>>> a)Some BFD implementations might not be able to handle MTU sized BFD
>>> packets - not because of performance - but because they did not expect
>> BFD
>>> packets to be full size and therefore might have issues passing a large
>>> packet through the local processing engine.
>>=20
>> In such cases, the BFD session wouldn't be able to come up.  Are you
>> picturing a problem more dire than that?
>=20
> [Les:] No. Again, as this is a discussion of deployment considerations I s=
ee this as an aid to indicate what problems may be seen.
> I am not asking you to "fix" the extension to overcome this.
>=20
>>> b)Accepted MTU is impacted by encapsulations and what layer is being
>>> considered (L2 or L3). And oftentimes link MTUs do not match on both
>> ends
>>> ("shudder"), so you might end up with unidirectional connectivity.
>>=20
>> Did you mean for BFD or more in the general sense?
>=20
> [Les:] It is a problem in the general sense, but it is relevant here becau=
se the extension proposes to send large packets. Absent that, MTU mismatches=
 would be very unlikely to affect BFD since the BFD packet size is small.
>=20
>>=20
>> For BFD, if you have one side testing for large MTU but not the other, we=

>> can still have a Up BFD session with possible packet drop for large packe=
ts
>> on the opposite side.  But there's the chance in some paths that MTU may b=
e
>> unidirectionally different - e.g. satellite down vs. land up.[1]
> In such cases, configuring BFD large on both sides would be the right
>> answer.  But it's also possible that large packets may only need to be
>> unidirectionally delivered.
>=20
> [Les:] I agree - and I think it is valid to use the extension unidirection=
ally in such cases.
>=20
>>=20
>>> I
>>> appreciate that this is exactly the problem that the extensions are
>>> designed to detect. I am just asking that these issues be discussed more=

>>> explicitly as an aid to the implementor. If that also makes Transports A=
Ds
>>> happier that is a side benefit - but that's not my motivation.
>>=20
>> We're happy to have that in the document.
>=20
> [Les:] Great!!
>=20
>>>>> What might be better?
>>>>>=20
>>>>> 1)Some statement that MTU isn't necessarily a consistent value for all=

>>>>> systems connected to an interface - which can impact the results when
>> large
>>>>> BFD packets are used. Implementations might then want to consider
>>>>> supporting "bfd-mtu" configuration and/or iterating across a range of
>> packet
>>>>> sizes to determine what works and what doesn't.
>>>>=20
>>>> I'm not clear what you intend by this statement.
>>>>=20
>>>> Are you asking that we emphasize the use case in a different way?  The
>>>> Introduction currently states:
>>>>  "However,
>>>>   some applications may require that the Path MTU [RFC1191] between
>>>>   those two systems meets a certain minimum criteria.  When the Path
>>>>   MTU decreases below the minimum threshold, those applications may
>>>>   wish to consider the path unusable."
>>>>=20
>>>> I'm also unclear what "Implementations" may refer to here.  BFD?  An
>>>> arbitrary user application?  If the latter, the application may not hav=
e
>>>> strict control over the generation of a given PDU size; e.g. TCP
>>>> applications.
>>>=20
>>> [Les:] I am talking about BFD implementations.
>>> I suppose one can imagine each BFD client requesting a certain MTU value=
 -
>>> but that wouldn't be my choice.
>>=20
>> BFD conversations happen between pairs of devices.  In the case that you
>> have multiple devices connected to a network segment, each conversation
>> could (and may intentionally) have different properties.
>>=20
>> An easy example of this is two devices running an IGP may want fast failu=
re
>> and two other devices running BGP may be happy with just under second-
>> level
>> failure.
>> So too could some device decide that it cares about bi-directional
>> path MTU while the others may not.
>=20
> [Les:] I agree. My point was BFD sessions are requested by clients (such a=
s a routing protocol). That client may/may not care about MTU e.g., a routin=
g protocol may not use MTU sized packets.
> But if the goal is to validate that MTU sized data traffic can successfull=
y be sent then "someone" has to enable that. And I would argue that the most=
 logical place to enable the feature is under BFD itself since a routing pro=
tocol (BGP/OSPF) won't necessarily care about MTU.
> Since you are speaking at the "device" level (not BFD client level) I thin=
k we are in agreement.
>=20
>> Given prior BFD documents' lack of discussion about such multi-access
>> network considerations, I'm not sure it's in character to have it just fo=
r
>> such a case, if that's what you're concerned with.
>>=20
>>> I would think the value we want is really the maximum L3 payload that th=
e
>>> link is intended to support - which should be independent of the BFD
>>> client. This might be larger than any client actually uses - but that
>>> seems like a good thing.
>>=20
>> In this case we have actual existence proof of desired behavior.  The lin=
ks
>> may be 9k but the user cares only about 1500 bytes end to end. If 1500 by=
tes
>> for BFD large works but 9k doesn't, we've not tested what the user actual=
ly
>> desired.
>=20
> [Les:] This is fine. This is consistent with my suggestion that an impleme=
ntation supports a "bfd-mtu" knob. This value can be <=3D link_mtu.
>=20
>    Les

[Gyan] As far as routing protocols go OSPF does MTU check which has to match=
 or the neighbor will not establish and that is during the initial exchange.=
  BGP does not have an MTU check however pmtud is generally enabled by defau=
lt so the MSS should change from default 560 to 1460 on 1500 MTU interfaces a=
nd higher on jumbo enabled interfaces but still an MTU mismatch will not pre=
vent the neighbor from coming up.  ISIS also check MTU which has to match as=
 well or the neighbor will not establish. I think this draft is very useful i=
n testing the large jumbo packets throughout bidirectional state with the in=
terface MTU size used in the control packets instead of the default smaller p=
ackets which should detect MTU mismatch on point to point links and asynchro=
nous mode or even echo mode won=E2=80=99t bring routing protocol up with the=
 mismatch since now the larger jumbo configured interface MTU is used in the=
 control packets.
>>=20
>> -- Jeff
>=20


From nobody Wed Oct 16 16:29:30 2019
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From: Gyan Mishra 
Date: Wed, 16 Oct 2019 19:29:12 -0400
Message-ID: 
Subject: Re: WGLC for draft-ietf-bfd-large-packets
To: "Les Ginsberg (ginsberg)" 
Cc: Jeffrey Haas , "Reshad Rahman (rrahman)" ,  "rtg-bfd@ietf.org" 
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All,

I support this draft as I think this would be very useful for IPv6 use
cases where EH headers are utilized excessively such as for an SRv6 use
case for traffic engineering over the internet and would be a method to
test via BFD multihop the path mtu where pmtud has failed to adjust MSS on
endpoints due to firewalls or other devices dropping ICMP unreachable
packet to big  messages resulting in 1280 mtu.


Thank you

Gyan S. Mishra

IT Network Engineering & Technology

Verizon Communications Inc. (VZ)

13101 Columbia Pike FDC1 3rd Floor

Silver Spring, MD 20904

United States

Phone: 301 502-1347

Email: gyan.s.mishra@verizon.com

www.linkedin.com/in/GYAN-MISHRA-RS-SP-MPLS-IPV6-EXPERT




On Wed, Oct 16, 2019 at 12:46 AM Gyan Mishra  wrote:

>
> In-line comment
> Sent from my iPhone
>
> > On Oct 3, 2019, at 8:02 PM, Les Ginsberg (ginsberg) 
> wrote:
> >
> > Jeff -
> >
> > For some reason this is proving to be harder than I think it should be.
> >
> > I keep thinking I am being transparent - yet you keep reading "ulterior
> motives" into what I say.
> > There are no ulterior motives.
> >
> > Let me try again...inline...
> >
> >> -----Original Message-----
> >> From: Jeffrey Haas 
> >> Sent: Thursday, October 03, 2019 1:13 PM
> >> To: Les Ginsberg (ginsberg) 
> >> Cc: Ketan Talaulikar (ketant) ; Reshad Rahman
> >> (rrahman) ; rtg-bfd@ietf.org
> >> Subject: Re: WGLC for draft-ietf-bfd-large-packets
> >>
> >> Les,
> >>
> >> On Fri, Sep 27, 2019 at 09:14:08PM +0000, Les Ginsberg (ginsberg) wrot=
e:
> >>>> The primary reason this is a "may" in the non-RFC 2119 sense is that
> our
> >>>> experience also suggests that when the scaling impacts are primarily
> pps
> >>>> rather than bps that this feature will likely have no major impact o=
n
> >>>> implementations beyond your valid concerns about exercising bugs.
> >>>>
> >>>> I suspect had this not been mentioned at all, you would have been
> >> happier.
> >>>> But you're not the target audience for this weak caveat.
> >>>
> >>> [Les:] I am not opposed to a discussion of potential issues in the
> draft -
> >>> rather I am encouraging it. But the current text isn't really on the
> mark
> >>> as far as potential issues - and we seem to agree on that. It also
> >>> suggests lengthening detection time to compensate - which I think is
> not
> >>> at all what you want to suggest as it diminishes the value of the
> >>> extension. It also isn't likely to address a real problem.
> >>
> >> I think what I'm seeing from you is roughly:
> >> - Note that larger MTUs may have impact on some implementations for BF=
D
> >>  throughput.
> >> - And simply stop there.
> > [Les:] What I would like to see discussed are points "a" and "b" below.
> > This is a section on deployment issues - not a normative part of the
> spec.
> >
> >>> For me, the potential issues are:
> >>>
> >>> a)Some BFD implementations might not be able to handle MTU sized BFD
> >>> packets - not because of performance - but because they did not expec=
t
> >> BFD
> >>> packets to be full size and therefore might have issues passing a lar=
ge
> >>> packet through the local processing engine.
> >>
> >> In such cases, the BFD session wouldn't be able to come up.  Are you
> >> picturing a problem more dire than that?
> >
> > [Les:] No. Again, as this is a discussion of deployment considerations =
I
> see this as an aid to indicate what problems may be seen.
> > I am not asking you to "fix" the extension to overcome this.
> >
> >>> b)Accepted MTU is impacted by encapsulations and what layer is being
> >>> considered (L2 or L3). And oftentimes link MTUs do not match on both
> >> ends
> >>> ("shudder"), so you might end up with unidirectional connectivity.
> >>
> >> Did you mean for BFD or more in the general sense?
> >
> > [Les:] It is a problem in the general sense, but it is relevant here
> because the extension proposes to send large packets. Absent that, MTU
> mismatches would be very unlikely to affect BFD since the BFD packet size
> is small.
> >
> >>
> >> For BFD, if you have one side testing for large MTU but not the other,
> we
> >> can still have a Up BFD session with possible packet drop for large
> packets
> >> on the opposite side.  But there's the chance in some paths that MTU
> may be
> >> unidirectionally different - e.g. satellite down vs. land up.[1]
> > In such cases, configuring BFD large on both sides would be the right
> >> answer.  But it's also possible that large packets may only need to be
> >> unidirectionally delivered.
> >
> > [Les:] I agree - and I think it is valid to use the extension
> unidirectionally in such cases.
> >
> >>
> >>> I
> >>> appreciate that this is exactly the problem that the extensions are
> >>> designed to detect. I am just asking that these issues be discussed
> more
> >>> explicitly as an aid to the implementor. If that also makes Transport=
s
> ADs
> >>> happier that is a side benefit - but that's not my motivation.
> >>
> >> We're happy to have that in the document.
> >
> > [Les:] Great!!
> >
> >>>>> What might be better?
> >>>>>
> >>>>> 1)Some statement that MTU isn't necessarily a consistent value for
> all
> >>>>> systems connected to an interface - which can impact the results wh=
en
> >> large
> >>>>> BFD packets are used. Implementations might then want to consider
> >>>>> supporting "bfd-mtu" configuration and/or iterating across a range =
of
> >> packet
> >>>>> sizes to determine what works and what doesn't.
> >>>>
> >>>> I'm not clear what you intend by this statement.
> >>>>
> >>>> Are you asking that we emphasize the use case in a different way?  T=
he
> >>>> Introduction currently states:
> >>>>  "However,
> >>>>   some applications may require that the Path MTU [RFC1191] between
> >>>>   those two systems meets a certain minimum criteria.  When the Path
> >>>>   MTU decreases below the minimum threshold, those applications may
> >>>>   wish to consider the path unusable."
> >>>>
> >>>> I'm also unclear what "Implementations" may refer to here.  BFD?  An
> >>>> arbitrary user application?  If the latter, the application may not
> have
> >>>> strict control over the generation of a given PDU size; e.g. TCP
> >>>> applications.
> >>>
> >>> [Les:] I am talking about BFD implementations.
> >>> I suppose one can imagine each BFD client requesting a certain MTU
> value -
> >>> but that wouldn't be my choice.
> >>
> >> BFD conversations happen between pairs of devices.  In the case that y=
ou
> >> have multiple devices connected to a network segment, each conversatio=
n
> >> could (and may intentionally) have different properties.
> >>
> >> An easy example of this is two devices running an IGP may want fast
> failure
> >> and two other devices running BGP may be happy with just under second-
> >> level
> >> failure.
> >> So too could some device decide that it cares about bi-directional
> >> path MTU while the others may not.
> >
> > [Les:] I agree. My point was BFD sessions are requested by clients (suc=
h
> as a routing protocol). That client may/may not care about MTU e.g., a
> routing protocol may not use MTU sized packets.
> > But if the goal is to validate that MTU sized data traffic can
> successfully be sent then "someone" has to enable that. And I would argue
> that the most logical place to enable the feature is under BFD itself sin=
ce
> a routing protocol (BGP/OSPF) won't necessarily care about MTU.
> > Since you are speaking at the "device" level (not BFD client level) I
> think we are in agreement.
> >
> >> Given prior BFD documents' lack of discussion about such multi-access
> >> network considerations, I'm not sure it's in character to have it just
> for
> >> such a case, if that's what you're concerned with.
> >>
> >>> I would think the value we want is really the maximum L3 payload that
> the
> >>> link is intended to support - which should be independent of the BFD
> >>> client. This might be larger than any client actually uses - but that
> >>> seems like a good thing.
> >>
> >> In this case we have actual existence proof of desired behavior.  The
> links
> >> may be 9k but the user cares only about 1500 bytes end to end. If 1500
> bytes
> >> for BFD large works but 9k doesn't, we've not tested what the user
> actually
> >> desired.
> >
> > [Les:] This is fine. This is consistent with my suggestion that an
> implementation supports a "bfd-mtu" knob. This value can be <=3D link_mtu=
.
> >
> >    Les
>
> [Gyan] As far as routing protocols go OSPF does MTU check which has to
> match or the neighbor will not establish and that is during the initial
> exchange.  BGP does not have an MTU check however pmtud is generally
> enabled by default so the MSS should change from default 560 to 1460 on
> 1500 MTU interfaces and higher on jumbo enabled interfaces but still an M=
TU
> mismatch will not prevent the neighbor from coming up.  ISIS also check M=
TU
> which has to match as well or the neighbor will not establish. I think th=
is
> draft is very useful in testing the large jumbo packets throughout
> bidirectional state with the interface MTU size used in the control packe=
ts
> instead of the default smaller packets which should detect MTU mismatch o=
n
> point to point links and asynchronous mode or even echo mode won=E2=80=99=
t bring
> routing protocol up with the mismatch since now the larger jumbo configur=
ed
> interface MTU is used in the control packets.
> >>
> >> -- Jeff
> >
>
--=20

Gyan S. Mishra

IT Network Engineering & Technology

Verizon Communications Inc. (VZ)

13101 Columbia Pike FDC1 3rd Floor

Silver Spring, MD 20904

United States

Phone: 301 502-1347

Email: gyan.s.mishra@verizon.com

www.linkedin.com/in/networking-technologies-consultant

--00000000000098c80205950f7879
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


All,

I support this draft as I think this would be very useful for IPv=
6 use cases where EH headers are utilized excessively such as for an SRv6 u=
se case for traffic engineering over the internet and would be a method to =
test via BFD multihop the path mtu where pmtud has failed to adjust MSS on =
endpoints due to firewalls or other devices dropping ICMP unreachable packe=
t to big =C2=A0messages resulting in 1280 mtu.

<=
/div>

Thank you

Gyan S. Mishra
IT Network Engineering & Technology=C2=A0
Verizon Communications=C2=A0Inc. (=
VZ)
13101 Columb=
ia Pike FDC1 3rd Floor
Silver Spring, MD 20904
United States
Phone:=C2=A0301 502-1347
Email:=C2=A0gyan.s.mishra@verizon.com
www.linkedin.com/in/GYAN-=
MISHRA-RS-SP-MPLS-IPV6-EXPERT




On Wed, Oct 16, 2019 at 12:46 AM G=
yan Mishra <hayabusagsm@gmail.c=
om> wrote:


In-line comment

Sent from my iPhone



> On Oct 3, 2019, at 8:02 PM, Les Ginsberg (ginsberg) <ginsberg@cisco.com> wrote:=


> 

> Jeff -

> 

> For some reason this is proving to be harder than I think it should be=
.

> 

> I keep thinking I am being transparent - yet you keep reading "ul=
terior motives" into what I say.

> There are no ulterior motives.

> 

> Let me try again...inline...

> 

>> -----Original Message-----

>> From: Jeffrey Haas <jhaas@pfrc.org>

>> Sent: Thursday, October 03, 2019 1:13 PM

>> To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>

>> Cc: Ketan Talaulikar (ketant) <ketant@cisco.com>; Reshad Rahman

>> (rrahman) <rrahman@cisco.com>; rtg-bfd@ietf.org

>> Subject: Re: WGLC for draft-ietf-bfd-large-packets

>> 

>> Les,

>> 

>> On Fri, Sep 27, 2019 at 09:14:08PM +0000, Les Ginsberg (ginsberg) =
wrote:

>>>> The primary reason this is a "may" in the non-RF=
C 2119 sense is that our

>>>> experience also suggests that when the scaling impacts are=
 primarily pps

>>>> rather than bps that this feature will likely have no majo=
r impact on

>>>> implementations beyond your valid concerns about exercisin=
g bugs.

>>>> 

>>>> I suspect had this not been mentioned at all, you would ha=
ve been

>> happier.

>>>> But you're not the target audience for this weak cavea=
t.

>>> 

>>> [Les:] I am not opposed to a discussion of potential issues in=
 the draft -

>>> rather I am encouraging it. But the current text isn't rea=
lly on the mark

>>> as far as potential issues - and we seem to agree on that. It =
also

>>> suggests lengthening detection time to compensate - which I th=
ink is not

>>> at all what you want to suggest as it diminishes the value of =
the

>>> extension. It also isn't likely to address a real problem.=


>> 

>> I think what I'm seeing from you is roughly:

>> - Note that larger MTUs may have impact on some implementations fo=
r BFD

>>=C2=A0 throughput.

>> - And simply stop there.

> [Les:] What I would like to see discussed are points "a" and=
 "b" below.

> This is a section on deployment issues - not a normative part of the s=
pec.

> 

>>> For me, the potential issues are:

>>> 

>>> a)Some BFD implementations might not be able to handle MTU siz=
ed BFD

>>> packets - not because of performance - but because they did no=
t expect

>> BFD

>>> packets to be full size and therefore might have issues passin=
g a large

>>> packet through the local processing engine.

>> 

>> In such cases, the BFD session wouldn't be able to come up.=C2=
=A0 Are you

>> picturing a problem more dire than that?

> 

> [Les:] No. Again, as this is a discussion of deployment considerations=
 I see this as an aid to indicate what problems may be seen.

> I am not asking you to "fix" the extension to overcome this.=


> 

>>> b)Accepted MTU is impacted by encapsulations and what layer is=
 being

>>> considered (L2 or L3). And oftentimes link MTUs do not match o=
n both

>> ends

>>> ("shudder"), so you might end up with unidirectional=
 connectivity.

>> 

>> Did you mean for BFD or more in the general sense?

> 

> [Les:] It is a problem in the general sense, but it is relevant here b=
ecause the extension proposes to send large packets. Absent that, MTU misma=
tches would be very unlikely to affect BFD since the BFD packet size is sma=
ll.

> 

>> 

>> For BFD, if you have one side testing for large MTU but not the ot=
her, we

>> can still have a Up BFD session with possible packet drop for larg=
e packets

>> on the opposite side.=C2=A0 But there's the chance in some pat=
hs that MTU may be

>> unidirectionally different - e.g. satellite down vs. land up.[1]
> In such cases, configuring BFD large on both sides would be the right<=
br>
>> answer.=C2=A0 But it's also possible that large packets may on=
ly need to be

>> unidirectionally delivered.

> 

> [Les:] I agree - and I think it is valid to use the extension unidirec=
tionally in such cases.

> 

>> 

>>> I

>>> appreciate that this is exactly the problem that the extension=
s are

>>> designed to detect. I am just asking that these issues be disc=
ussed more

>>> explicitly as an aid to the implementor. If that also makes Tr=
ansports ADs

>>> happier that is a side benefit - but that's not my motivat=
ion.

>> 

>> We're happy to have that in the document.

> 

> [Les:] Great!!

> 

>>>>> What might be better?

>>>>> 

>>>>> 1)Some statement that MTU isn't necessarily a cons=
istent value for all

>>>>> systems connected to an interface - which can impact t=
he results when

>> large

>>>>> BFD packets are used. Implementations might then want =
to consider

>>>>> supporting "bfd-mtu" configuration and/or it=
erating across a range of

>> packet

>>>>> sizes to determine what works and what doesn't.
>>>> 

>>>> I'm not clear what you intend by this statement.

>>>> 

>>>> Are you asking that we emphasize the use case in a differe=
nt way?=C2=A0 The

>>>> Introduction currently states:

>>>>=C2=A0 "However,

>>>>=C2=A0 =C2=A0some applications may require that the Path MT=
U [RFC1191] between

>>>>=C2=A0 =C2=A0those two systems meets a certain minimum crit=
eria.=C2=A0 When the Path

>>>>=C2=A0 =C2=A0MTU decreases below the minimum threshold, tho=
se applications may

>>>>=C2=A0 =C2=A0wish to consider the path unusable."

>>>> 

>>>> I'm also unclear what "Implementations" may =
refer to here.=C2=A0 BFD?=C2=A0 An

>>>> arbitrary user application?=C2=A0 If the latter, the appli=
cation may not have

>>>> strict control over the generation of a given PDU size; e.=
g. TCP

>>>> applications.

>>> 

>>> [Les:] I am talking about BFD implementations.

>>> I suppose one can imagine each BFD client requesting a certain=
 MTU value -

>>> but that wouldn't be my choice.

>> 

>> BFD conversations happen between pairs of devices.=C2=A0 In the ca=
se that you

>> have multiple devices connected to a network segment, each convers=
ation

>> could (and may intentionally) have different properties.

>> 

>> An easy example of this is two devices running an IGP may want fas=
t failure

>> and two other devices running BGP may be happy with just under sec=
ond-

>> level

>> failure.

>> So too could some device decide that it cares about bi-directional=


>> path MTU while the others may not.

> 

> [Les:] I agree. My point was BFD sessions are requested by clients (su=
ch as a routing protocol). That client may/may not care about MTU e.g., a r=
outing protocol may not use MTU sized packets.

> But if the goal is to validate that MTU sized data traffic can success=
fully be sent then "someone" has to enable that. And I would argu=
e that the most logical place to enable the feature is under BFD itself sin=
ce a routing protocol (BGP/OSPF) won't necessarily care about MTU.

> Since you are speaking at the "device" level (not BFD client=
 level) I think we are in agreement.

> 

>> Given prior BFD documents' lack of discussion about such multi=
-access

>> network considerations, I'm not sure it's in character to =
have it just for

>> such a case, if that's what you're concerned with.

>> 

>>> I would think the value we want is really the maximum L3 paylo=
ad that the

>>> link is intended to support - which should be independent of t=
he BFD

>>> client. This might be larger than any client actually uses - b=
ut that

>>> seems like a good thing.

>> 

>> In this case we have actual existence proof of desired behavior.=
=C2=A0 The links

>> may be 9k but the user cares only about 1500 bytes end to end. If =
1500 bytes

>> for BFD large works but 9k doesn't, we've not tested what =
the user actually

>> desired.

> 

> [Les:] This is fine. This is consistent with my suggestion that an imp=
lementation supports a "bfd-mtu" knob. This value can be <=3D =
link_mtu.

> 

>=C2=A0 =C2=A0 Les



[Gyan] As far as routing protocols go OSPF does MTU check which has to matc=
h or the neighbor will not establish and that is during the initial exchang=
e.=C2=A0 BGP does not have an MTU check however pmtud is generally enabled =
by default so the MSS should change from default 560 to 1460 on 1500 MTU in=
terfaces and higher on jumbo enabled interfaces but still an MTU mismatch w=
ill not prevent the neighbor from coming up.=C2=A0 ISIS also check MTU whic=
h has to match as well or the neighbor will not establish. I think this dra=
ft is very useful in testing the large jumbo packets throughout bidirection=
al state with the interface MTU size used in the control packets instead of=
 the default smaller packets which should detect MTU mismatch on point to p=
oint links and asynchronous mode or even echo mode won=E2=80=99t bring rout=
ing protocol up with the mismatch since now the larger jumbo configured int=
erface MTU is used in the control packets.

>> 

>> -- Jeff

> 


-- 
<=
div dir=3D"ltr">
Gyan S. Mishra
IT Networ=
k Engineering &
Technology=C2=A0=

Verizon
Communications=C2=A0Inc. (VZ)=

13101 Columbia Pike FDC1 3rd
Floor
=

Silver Spring, MD 20904
United States<=
span style=3D"color:rgb(80,0,80);background-image:initial;background-positi=
on:initial;background-repeat:initial">
Phone:=C2=A0301 502-1347
Email:=C2=A0gyan.s.mishra@verizon.=
com

















www.linkedin.com/in/networking-technologies-co=
nsultant



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In-Reply-To: 
From: Greg Mirsky 
Date: Wed, 16 Oct 2019 19:23:50 -0700
Message-ID: 
Subject: Re: PIM BFD RFC
To: Gyan Mishra 
Cc: rtg-bfd WG , xu.benchong@zte.com.cn,  "Mankamana Mishra (mankamis)" 
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Hi Gyan,
thank you for bringing draft-ietf-pim-drlb to my attention (I'm
following discussions in PIM WG but was not aware of this use case). Also,
I appreciate you sharing your thoughts on the applicability of RFCs 8562
and 8563 to the GDR use case. With the current scenario, as I
understand it, there could be more than two GDR Candidates on the given LAN
segment. Let us assume that there three such routers. If one is elected as
GDR and another as GBDR, then third is GDROther. If that is the case, then
the mechanism described for DR/BDR/DROther
in draft-ietf-pim-bfd-p2mp-use-case can be used for expedited convergence
of GDR/GDBR/GDROther. Would you agree?

Regards,
Greg

On Tue, Oct 15, 2019 at 9:10 PM Gyan Mishra  wrote:

>
> Greg
>
> + Mankamana and Benchon
>
> ...from PIM WG & BESS which owns LSM MVPN mLDP / P2MP TE S-PMSI and
> MI-PMSI.
>
> We were discussing PIM BFD use case on this BFD WG thread  and  RFC 8562
> and RFC 8563 covers strictly L3 VPN LSM ( label switched Multicast) LMDT
> (labeled multicast distribution tree) mLDP / P2MP p-tree S-PMSI ( selective
> constrained MDT / Cisco data MDT) MI-PMSI(inclusive MDT for all VRFs) and
> not Ethernet switching LAN based PIM SM BFD.
>
> We have a new draft in the PIM WG PIM DRLB load balancing GDR capability
> and the draft of hashing of ASM PIM RP hash and ASM and SSM S,G hash load
> balancing of traffic across both PIM DR/BDR does significantly help with
> convergence as 50/50 LB split but during failover you still have 50% of the
> traffic that still has to reconverge and SPT tree MRIB/MFIB state has to
> rebuild.
>
>
> https://tools.ietf.org/html/draft-ietf-pim-drlb-11
>
>
> So the BFD PIM Draft would register the PIM protocol and in asynchronous
> mode with echo disabled we can achieve sub millisecond detection time and
> convergence during failover.
>
> So I do think we need a PIM BFD Draft.
>
> Since this falls between multiple WG but since BFD related this would be
> under the BFD WG.
>
> I am part of the BFD WG as well as part of PIM and BESS so I can assist in
> writing the draft if we are all in agreement that this is needed and can
> work with Mankamana and Benchon as well in creating the draft.
>
> Gyan
>
> Sent from my iPhone
>
> On Oct 12, 2019, at 12:07 AM, Greg Mirsky  wrote:
>
> Hi Gyan,
> thank you for your interest in this draft. We've described how RFC 8562
> BFD for Multipoint Networks  can
> be used to shorten convergence in PIM-SM. The similar scenario discussed in
> draft-ietf-bess-mvpn-fast-failover
>  where
> p2mp BFD is used by tails to detect the failure of the head/root or the
> multicast tree. If it is required for the head/root to detect a defect of
> the multicast tree toward a tail, we'll turn to RFC 8563 BFD for
> Multipoint  Active Tails  as
> in draft-hu-bier-bfd 
> .
> Hope this information would be helpful to you. I always welcome your
> questions.
>
> Regards,
> Greg
>
> On Fri, Oct 11, 2019 at 7:40 PM Gyan Mishra  wrote:
>
>> Greg
>>
>> I saw your draft on PIM BFD use cases but could not find the RFC on PIM
>> BFD.
>>
>>
>> https://tools.ietf.org/id/draft-mirsky-pim-bfd-p2mp-use-case-02.html
>>
>> Thanks
>>
>> Gyan
>> Verizon Communications
>> Cell-301 502-1347
>>
>>
>> Sent from my iPhone
>>
>> On Oct 11, 2019, at 9:53 PM, Gyan Mishra  wrote:
>>
>>
>> BFD WG
>>
>> Anyone know what the RFC or draft for PIM BFD support.
>>
>> Thank you
>>
>> Gyan
>> Verizon Communications
>>
>>
>>
>> Sent from my iPhone
>>
>>

--00000000000024a9ca059511e9d6
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi=C2=A0Gyan,
thank you for bringing=C2=A0draft-ietf-p=
im-drlb to my attention (I'm following=C2=A0discussions in PIM WG but w=
as not aware of this use case). Also, I appreciate you sharing your thought=
s on the applicability of RFCs 8562 and 8563 to the GDR use case. With the =
current scenario, as I understand=C2=A0it, there could be more than two GDR=
 Candidates on the given LAN segment. Let us assume that there three such r=
outers. If one is elected as GDR and another as GBDR, then third is GDROthe=
r. If that is=C2=A0the case, then the mechanism described for DR/BDR/DROthe=
r in=C2=A0draft-ietf-pim-bfd-p2mp-use-case can be used for expedited conver=
gence of GDR/GDBR/GDROther. Would you agree?

Regar=
ds,
Greg

On Tue, Oct 15, 2019 at 9:10 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:<=
br>

Greg=C2=A0

+ Mankamana and Bencho=
n=C2=A0

...from PIM WG & BESS which owns LSM MVPN mL=
DP / P2MP TE S-PMSI and MI-PMSI.

We were discussing PIM =
BFD use case on this BFD WG thread =C2=A0and =C2=A0RFC 8562 and RFC 8563 co=
vers strictly L3 VPN LSM ( label switched Multicast) LMDT (labeled multicas=
t distribution tree) mLDP / P2MP p-tree S-PMSI ( selective constrained MDT =
/ Cisco data MDT) MI-PMSI(inclusive MDT for all VRFs) and not Ethernet swit=
ching LAN based PIM SM BFD.

We have a new draft in=
 the PIM WG PIM DRLB load balancing GDR capability and the draft of hashing=
 of ASM PIM RP hash and ASM and SSM S,G hash load balancing of traffic acro=
ss both PIM DR/BDR does significantly help with convergence as 50/50 LB spl=
it but during failover you still have 50% of the traffic that still has to =
reconverge and SPT tree MRIB/MFIB state has to rebuild. =C2=A0



So the BFD PIM Draft would register the PIM protocol and in asynchronous m=
ode with echo disabled we can achieve sub millisecond detection time and co=
nvergence during failover.

So I do think we need a=
 PIM BFD Draft.=C2=A0

Since this falls between mul=
tiple WG but since BFD related this would be under the BFD WG.
I am part of the BFD WG as well as part of PIM and BESS so I c=
an assist in writing the draft if we are all in agreement that this is need=
ed and can work with=C2=A0Mankamana and Benchon as well in creating the draft.
<=
span style=3D"background-color:rgba(255,255,255,0)">
<=
span style=3D"background-color:rgba(255,255,255,0)">Gyan
<=
br>
Se=
nt from my iPhone

On Oct 12, 2019, at 12:07 AM, G=
reg Mirsky <g=
regimirsky@gmail.com> wrote:

=

Hi Gyan,
thank you for your interest =
in this draft. We've described how RFC 8562 BFD for Multipoint Networks=C2=A0can be used to shorten=C2=A0convergence in PIM-SM. The similar scena=
rio discussed in draft-ietf-bess-mvpn-fast-failover=
=C2=A0where p2mp BFD is used by tails to detect the failure of the head=
/root or the multicast tree. If it is required for the head/root to detect =
a defect of the multicast tree toward a tail, we'll turn to RFC 8563 BFD f=
or Multipoint=C2=A0 Active Tails=C2=A0as in draft-hu-bier-bfd.


On =
Fri, Oct 11, 2019 at 7:40 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:
=

Greg=C2=
=A0

I saw your draft on PIM BFD use cases but could not =
find the RFC on PIM BFD.



Gyan
Ver=
izon Communications=C2=A0
Cell-301 502-1347

<=
div>
Sent from my iPhone
On Oct 11, 2019, at 9:53 PM, Gyan Mishra <hayabusagsm@gmail.com> wrote:

=


BFD=
 WG

Anyone know what the RFC or draft for =
PIM BFD support.

Thank you

Gyan 
Verizon Communications 
<=
span>


Sent from my iPhone=





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In-Reply-To: 
From: Robert Raszuk 
Date: Thu, 17 Oct 2019 09:35:33 +0200
Message-ID: 
Subject: Re: WGLC for draft-ietf-bfd-large-packets
To: "rtg-bfd@ietf.org" 
Cc: "Les Ginsberg (ginsberg)" , "Reshad Rahman (rrahman)" ,  Gyan Mishra 
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Dear WG,

Thank you Gyan for your note.

It very clearly highlights my primary concern expressed earlier of false
assumptions on how engineers may try to (mis)use bfd-large in multihop
cases.

Below note is a brilliant example of how one may not realize that actual
paths BFD packets take can be just a fraction of paths their data plane or
even other control plane packets may traverse over a network or set of
networks.

I am always concerned when protocol extensions being standardized are known
to only work in 1 out of 10 deployment scenarios and when chances of such
opportunity of incorrect use are evident yet no safety inline fuse exist.

Many thx,
Robert.

On Thu, Oct 17, 2019 at 1:29 AM Gyan Mishra  wrote:

> All,
>
> I support this draft as I think this would be very useful for IPv6 use
> cases where EH headers are utilized excessively such as for an SRv6 use
> case for traffic engineering over the internet and would be a method to
> test via BFD multihop the path mtu where pmtud has failed to adjust MSS on
> endpoints due to firewalls or other devices dropping ICMP unreachable
> packet to big  messages resulting in 1280 mtu.
>

--000000000000ce2894059516430d
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Content-Transfer-Encoding: quoted-printable


Dear WG,

Thank you Gyan for =
your note.=C2=A0

It very clearly highlights=C2=A0m=
y primary concern expressed earlier of false assumptions on how engineers m=
ay try to (mis)use bfd-large in multihop cases.=C2=A0

<=
div>Below note is a brilliant example of how one may not realize that actua=
l paths BFD packets take can be just a fraction of paths their data plane o=
r even other control plane packets may traverse over a network or set of ne=
tworks.

I am always concerned=C2=A0whe=
n=C2=A0protocol extensions being standardized are known to only work in 1 o=
ut of 10 deployment scenarios and when chances of such opportunity of incor=
rect use are evident yet no safety inline fuse exist.=C2=A0

Many thx,
Robert.

On Thu, Oct 17, 2019 at 1:29 AM=
 Gyan Mishra <hayabusagsm@gmail=
.com> wrote:
All,

I support this draft as I think this would be very useful for=
 IPv6 use cases where EH headers are utilized excessively such as for an SR=
v6 use case for traffic engineering over the internet and would be a method=
 to test via BFD multihop the path mtu where pmtud has failed to adjust MSS=
 on endpoints due to firewalls or other devices dropping ICMP unreachable p=
acket to big =C2=A0messages resulting in 1280 mtu.
<=
br>
=C2=A0


--000000000000ce2894059516430d--


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From: Gyan Mishra 
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Content-Type: multipart/alternative; boundary=Apple-Mail-C6B1FF28-D82C-4018-8AA9-6E23F07199F2
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Subject: Re: PIM BFD RFC
X-Mailer: iPhone Mail (16G102)
In-Reply-To: 
Date: Thu, 17 Oct 2019 10:10:49 -0400
Cc: rtg-bfd WG , xu.benchong@zte.com.cn, "Mankamana Mishra (mankamis)" 
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To: Greg Mirsky 
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Greg=20

That is true that there can be more GDR candidates but with the modulo hashi=
ng algorithm the load balancing becomes less even with odd number of routers=
 similar to XOR bitwise source/destination hash.=20

So the issue is that with even routers you do achieve close to 100% load bal=
ancing which means a very close 50/50 split between the two routers with the=
 hashing algorithm.  So even in that scenario if one of the 2 routers doing d=
own instead of having to reconverge 100% of all of you traffic you reconverg=
e only 50% so the impact is only 50% of your traffic volume.  As you increas=
e the number of routers the load is split between routers however and so the=
 impact is diminished but not eliminated and of course with odd number route=
rs 3  5 7 etc you have uneven load balancing so more impact and with even 2 4=
 6 close to perfect split of load balancing.

So bottom line is that traffic is on the router that went down has to reconv=
erge be taken over or split hashed onto the other remaining routers so the f=
rom my point of view their is still definitely improvements gains with tight=
 PIM timers with BFD single hop asynchronous mode to get as close to hitless=
 convergence.  The P2MP RFCs are strictly for labels switched multicast mult=
ipoint LSP with mLDP or P2MP TE P2MP or MP2MP MDT strictly for MVPN scenario=
s and cannot be applied to LAN.

Gyan

Sent from my iPhone

> On Oct 16, 2019, at 10:23 PM, Greg Mirsky  wrote:
>=20
> Hi Gyan,
> thank you for bringing draft-ietf-pim-drlb to my attention (I'm following d=
iscussions in PIM WG but was not aware of this use case). Also, I appreciate=
 you sharing your thoughts on the applicability of RFCs 8562 and 8563 to the=
 GDR use case. With the current scenario, as I understand it, there could be=
 more than two GDR Candidates on the given LAN segment. Let us assume that t=
here three such routers. If one is elected as GDR and another as GBDR, then t=
hird is GDROther. If that is the case, then the mechanism described for DR/B=
DR/DROther in draft-ietf-pim-bfd-p2mp-use-case can be used for expedited con=
vergence of GDR/GDBR/GDROther. Would you agree?
>=20
> Regards,
> Greg
>=20
>> On Tue, Oct 15, 2019 at 9:10 PM Gyan Mishra  wrote=
:
>>=20
>> Greg=20
>>=20
>> + Mankamana and Benchon=20
>>=20
>> ...from PIM WG & BESS which owns LSM MVPN mLDP / P2MP TE S-PMSI and MI-PM=
SI.
>>=20
>> We were discussing PIM BFD use case on this BFD WG thread  and  RFC 8562 a=
nd RFC 8563 covers strictly L3 VPN LSM ( label switched Multicast) LMDT (lab=
eled multicast distribution tree) mLDP / P2MP p-tree S-PMSI ( selective cons=
trained MDT / Cisco data MDT) MI-PMSI(inclusive MDT for all VRFs) and not Et=
hernet switching LAN based PIM SM BFD.
>>=20
>> We have a new draft in the PIM WG PIM DRLB load balancing GDR capability a=
nd the draft of hashing of ASM PIM RP hash and ASM and SSM S,G hash load bal=
ancing of traffic across both PIM DR/BDR does significantly help with conver=
gence as 50/50 LB split but during failover you still have 50% of the traffi=
c that still has to reconverge and SPT tree MRIB/MFIB state has to rebuild. =
=20
>>=20
>>=20
>> https://tools.ietf.org/html/draft-ietf-pim-drlb-11
>>=20
>>=20
>> So the BFD PIM Draft would register the PIM protocol and in asynchronous m=
ode with echo disabled we can achieve sub millisecond detection time and con=
vergence during failover.
>>=20
>> So I do think we need a PIM BFD Draft.=20
>>=20
>> Since this falls between multiple WG but since BFD related this would be u=
nder the BFD WG.
>>=20
>> I am part of the BFD WG as well as part of PIM and BESS so I can assist i=
n writing the draft if we are all in agreement that this is needed and can w=
ork with Mankamana and Benchon as well in creating the draft.
>>=20
>> Gyan
>>=20
>> Sent from my iPhone
>>=20
>>> On Oct 12, 2019, at 12:07 AM, Greg Mirsky  wrote:=

>>>=20
>>> Hi Gyan,
>>> thank you for your interest in this draft. We've described how RFC 8562 B=
FD for Multipoint Networks can be used to shorten convergence in PIM-SM. The=
 similar scenario discussed in draft-ietf-bess-mvpn-fast-failover where p2mp=
 BFD is used by tails to detect the failure of the head/root or the multicas=
t tree. If it is required for the head/root to detect a defect of the multic=
ast tree toward a tail, we'll turn to RFC 8563 BFD for Multipoint  Active Ta=
ils as in draft-hu-bier-bfd.
>>> Hope this information would be helpful to you. I always welcome your que=
stions.
>>>=20
>>> Regards,
>>> Greg
>>>=20
>>>> On Fri, Oct 11, 2019 at 7:40 PM Gyan Mishra  wro=
te:
>>>> Greg=20
>>>>=20
>>>> I saw your draft on PIM BFD use cases but could not find the RFC on PIM=
 BFD.
>>>>=20
>>>>=20
>>>> https://tools.ietf.org/id/draft-mirsky-pim-bfd-p2mp-use-case-02.html
>>>>=20
>>>> Thanks=20
>>>>=20
>>>> Gyan
>>>> Verizon Communications=20
>>>> Cell-301 502-1347
>>>>=20
>>>>=20
>>>> Sent from my iPhone
>>>>=20
>>>>> On Oct 11, 2019, at 9:53 PM, Gyan Mishra  wrote=
:
>>>>>=20
>>>>>=20
>>>>> BFD WG
>>>>>=20
>>>>> Anyone know what the RFC or draft for PIM BFD support.
>>>>>=20
>>>>> Thank you
>>>>>=20
>>>>> Gyan=20
>>>>> Verizon Communications=20
>>>>>=20
>>>>>=20
>>>>>=20
>>>>> Sent from my iPhone

--Apple-Mail-C6B1FF28-D82C-4018-8AA9-6E23F07199F2
Content-Type: text/html;
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

Greg 

That is true t=
hat there can be more GDR candidates but with the modulo hashing algorithm t=
he load balancing becomes less even with odd number of routers similar to XO=
R bitwise source/destination hash. 

So the iss=
ue is that with even routers you do achieve close to 100% load balancing whi=
ch means a very close 50/50 split between the two routers with the hashing a=
lgorithm.  So even in that scenario if one of the 2 routers doing down i=
nstead of having to reconverge 100% of all of you traffic you reconverge onl=
y 50% so the impact is only 50% of your traffic volume.  As you increas=
e the number of routers the load is split between routers however and so the=
 impact is diminished but not eliminated and of course with odd number route=
rs 3  5 7 etc you have uneven load balancing so more impact and with ev=
en 2 4 6 close to perfect split of load balancing.

=
So bottom line is that traffic is on the router that went down has to reconv=
erge be taken over or split hashed onto the other remaining routers so the f=
rom my point of view their is still definitely improvements gains with tight=
 PIM timers with BFD single hop asynchronous mode to get as close to hitless=
 convergence.  The P2MP RFCs are strictly for labels switched multicast=
 multipoint LSP with mLDP or P2MP TE P2MP or MP2MP MDT strictly for MVPN sce=
narios and cannot be applied to LAN.

Gyan

Sent from my iPhone

On Oct 16, 2019, at 10:23 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

Hi Gyan,
tha=
nk you for bringing draft-ietf-pim-drlb to my attention (I'm following&=
nbsp;discussions in PIM WG but was not aware of this use case). Also, I appr=
eciate you sharing your thoughts on the applicability of RFCs 8562 and 8563 t=
o the GDR use case. With the current scenario, as I understand it, ther=
e could be more than two GDR Candidates on the given LAN segment. Let us ass=
ume that there three such routers. If one is elected as GDR and another as G=
BDR, then third is GDROther. If that is the case, then the mechanism de=
scribed for DR/BDR/DROther in draft-ietf-pim-bfd-p2mp-use-case can be u=
sed for expedited convergence of GDR/GDBR/GDROther. Would you agree?

Regards,
Greg

On Tue, Oct 15, 2019 at 9:10 P=
M Gyan Mishra <hayabusagsm@gmail=
.com> wrote:

Greg 

+ Man=
kamana and Benchon 

...from PIM WG & BESS which o=
wns LSM MVPN mLDP / P2MP TE S-PMSI and MI-PMSI.

We were d=
iscussing PIM BFD use case on this BFD WG thread  and  RFC 8562 an=
d RFC 8563 covers strictly L3 VPN LSM ( label switched Multicast) LMDT (labe=
led multicast distribution tree) mLDP / P2MP p-tree S-PMSI ( selective const=
rained MDT / Cisco data MDT) MI-PMSI(inclusive MDT for all VRFs) and not Eth=
ernet switching LAN based PIM SM BFD.

We have a new=
 draft in the PIM WG PIM DRLB load balancing GDR capability and the draft of=
 hashing of ASM PIM RP hash and ASM and SSM S,G hash load balancing of traff=
ic across both PIM DR/BDR does significantly help with convergence as 50/50 L=
B split but during failover you still have 50% of the traffic that still has=
 to reconverge and SPT tree MRIB/MFIB state has to rebuild.  




S=
o the BFD PIM Draft would register the PIM protocol and in asynchronous mode=
 with echo disabled we can achieve sub millisecond detection time and conver=
gence during failover.

So I do think we need a PIM B=
FD Draft. 

Since this falls between multiple W=
G but since BFD related this would be under the BFD WG.

=

I am part of the BFD WG as well as part of PIM and BESS so I can assist=
 in writing the draft if we are all in agreement that this is needed and can=
 work with Mankama=
na and Benchon as well in creating the draft.

Gyan

Sent from my iPhon=
e

On Oct 12, 2019, at 12:07 AM, Greg Mirsky <gregimirsky@gmail.c=
om> wrote:

Hi Gyan,
thank you for your interest in this draft. We've=
 described how RFC 8562 BFD for Multipoint Networks can be used to shorte=
n convergence in PIM-SM. The similar scenario discussed in draft-ietf-bess-mvpn-fast-failover where p2mp BFD is used b=
y tails to detect the failure of the head/root or the multicast tree. If it i=
s required for the head/root to detect a defect of the multicast tree toward=
 a tail, we'll turn to RFC 8563 BFD for Multipoint  Active Tails a=
s in draft-hu-bier-bfd.
Hope this information would be hel=
pful to you. I always welcome your questions.

Regar=
ds,
Greg

On Fri, Oct 11, 2019 at 7:40 PM Gyan Mishra <hayabusagsm@gmail.com<=
/a>> wrote:
Greg 

I saw your draft on PIM BFD use=
 cases but could not find the RFC on PIM BFD.


<=
/div>

G=
yan
Verizon Communications 
Cell-301 502-1347
=



Sent from my iPhone

On Oct 11, 2019, at 9:53 PM, Gyan Mishra <hayabusagsm@gmail.com> wro=
te:

BFD WG

Anyone know what the RFC or d=
raft for PIM BFD support.

Thank you<=
br>
Gyan 
Verizon Communications 



Sent from my i=
Phone



=

--Apple-Mail-C6B1FF28-D82C-4018-8AA9-6E23F07199F2--


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In-Reply-To: <6688ABC1-BF0C-42EC-B2B3-8CE93C870538@gmail.com>
From: Greg Mirsky 
Date: Thu, 17 Oct 2019 07:46:43 -0700
Message-ID: 
Subject: Re: PIM BFD RFC
To: Gyan Mishra 
Cc: rtg-bfd WG , xu.benchong@zte.com.cn,  "Mankamana Mishra (mankamis)" 
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--000000000000d4bc2c05951c496d
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Hi Gyan,
many thanks for adding more details to the scenario you're discussing. As
you know, p2mp BFD, as defined in RFC 8562 and RFC 8563, operates in the
Demand mode. What are the advantages of using the Asynchronous mode, and I
assume that implies using p2p BFD sessions, as in RFC 5881 for single-hop
BFD?

Regards,
Greg

On Thu, Oct 17, 2019 at 7:10 AM Gyan Mishra  wrote:

> Greg
>
> That is true that there can be more GDR candidates but with the modulo
> hashing algorithm the load balancing becomes less even with odd number of
> routers similar to XOR bitwise source/destination hash.
>
> So the issue is that with even routers you do achieve close to 100% load
> balancing which means a very close 50/50 split between the two routers with
> the hashing algorithm.  So even in that scenario if one of the 2 routers
> doing down instead of having to reconverge 100% of all of you traffic you
> reconverge only 50% so the impact is only 50% of your traffic volume.  As
> you increase the number of routers the load is split between routers
> however and so the impact is diminished but not eliminated and of course
> with odd number routers 3  5 7 etc you have uneven load balancing so more
> impact and with even 2 4 6 close to perfect split of load balancing.
>
> So bottom line is that traffic is on the router that went down has to
> reconverge be taken over or split hashed onto the other remaining routers
> so the from my point of view their is still definitely improvements gains
> with tight PIM timers with BFD single hop asynchronous mode to get as close
> to hitless convergence.  The P2MP RFCs are strictly for labels switched
> multicast multipoint LSP with mLDP or P2MP TE P2MP or MP2MP MDT strictly
> for MVPN scenarios and cannot be applied to LAN.
>
> Gyan
>
> Sent from my iPhone
>
> On Oct 16, 2019, at 10:23 PM, Greg Mirsky  wrote:
>
> Hi Gyan,
> thank you for bringing draft-ietf-pim-drlb to my attention (I'm
> following discussions in PIM WG but was not aware of this use case). Also,
> I appreciate you sharing your thoughts on the applicability of RFCs 8562
> and 8563 to the GDR use case. With the current scenario, as I
> understand it, there could be more than two GDR Candidates on the given LAN
> segment. Let us assume that there three such routers. If one is elected as
> GDR and another as GBDR, then third is GDROther. If that is the case, then
> the mechanism described for DR/BDR/DROther
> in draft-ietf-pim-bfd-p2mp-use-case can be used for expedited convergence
> of GDR/GDBR/GDROther. Would you agree?
>
> Regards,
> Greg
>
> On Tue, Oct 15, 2019 at 9:10 PM Gyan Mishra  wrote:
>
>>
>> Greg
>>
>> + Mankamana and Benchon
>>
>> ...from PIM WG & BESS which owns LSM MVPN mLDP / P2MP TE S-PMSI and
>> MI-PMSI.
>>
>> We were discussing PIM BFD use case on this BFD WG thread  and  RFC 8562
>> and RFC 8563 covers strictly L3 VPN LSM ( label switched Multicast) LMDT
>> (labeled multicast distribution tree) mLDP / P2MP p-tree S-PMSI ( selective
>> constrained MDT / Cisco data MDT) MI-PMSI(inclusive MDT for all VRFs) and
>> not Ethernet switching LAN based PIM SM BFD.
>>
>> We have a new draft in the PIM WG PIM DRLB load balancing GDR capability
>> and the draft of hashing of ASM PIM RP hash and ASM and SSM S,G hash load
>> balancing of traffic across both PIM DR/BDR does significantly help with
>> convergence as 50/50 LB split but during failover you still have 50% of the
>> traffic that still has to reconverge and SPT tree MRIB/MFIB state has to
>> rebuild.
>>
>>
>> https://tools.ietf.org/html/draft-ietf-pim-drlb-11
>>
>>
>> So the BFD PIM Draft would register the PIM protocol and in asynchronous
>> mode with echo disabled we can achieve sub millisecond detection time and
>> convergence during failover.
>>
>> So I do think we need a PIM BFD Draft.
>>
>> Since this falls between multiple WG but since BFD related this would be
>> under the BFD WG.
>>
>> I am part of the BFD WG as well as part of PIM and BESS so I can assist
>> in writing the draft if we are all in agreement that this is needed and can
>> work with Mankamana and Benchon as well in creating the draft.
>>
>> Gyan
>>
>> Sent from my iPhone
>>
>> On Oct 12, 2019, at 12:07 AM, Greg Mirsky  wrote:
>>
>> Hi Gyan,
>> thank you for your interest in this draft. We've described how RFC 8562
>> BFD for Multipoint Networks  can
>> be used to shorten convergence in PIM-SM. The similar scenario discussed in
>> draft-ietf-bess-mvpn-fast-failover
>>  where
>> p2mp BFD is used by tails to detect the failure of the head/root or the
>> multicast tree. If it is required for the head/root to detect a defect of
>> the multicast tree toward a tail, we'll turn to RFC 8563 BFD for
>> Multipoint  Active Tails  as
>> in draft-hu-bier-bfd
>> .
>> Hope this information would be helpful to you. I always welcome your
>> questions.
>>
>> Regards,
>> Greg
>>
>> On Fri, Oct 11, 2019 at 7:40 PM Gyan Mishra 
>> wrote:
>>
>>> Greg
>>>
>>> I saw your draft on PIM BFD use cases but could not find the RFC on PIM
>>> BFD.
>>>
>>>
>>> https://tools.ietf.org/id/draft-mirsky-pim-bfd-p2mp-use-case-02.html
>>>
>>> Thanks
>>>
>>> Gyan
>>> Verizon Communications
>>> Cell-301 502-1347
>>>
>>>
>>> Sent from my iPhone
>>>
>>> On Oct 11, 2019, at 9:53 PM, Gyan Mishra  wrote:
>>>
>>>
>>> BFD WG
>>>
>>> Anyone know what the RFC or draft for PIM BFD support.
>>>
>>> Thank you
>>>
>>> Gyan
>>> Verizon Communications
>>>
>>>
>>>
>>> Sent from my iPhone
>>>
>>>

--000000000000d4bc2c05951c496d
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Gyan,
many thanks for adding more details to the sc=
enario you're discussing. As you know, p2mp BFD, as defined in RFC 8562=
 and RFC 8563, operates in the Demand mode. What are the advantages of usin=
g the Asynchronous mode, and I assume that implies using p2p BFD sessions, =
as in RFC 5881 for single-hop BFD?

Regards,
<=
div>Greg

On Thu, Oct 17, 2019 at 7:10 AM Gyan Mishra <hayabusagsm@gmail.com> wrote:
Greg=
=C2=A0

That is true that there can be more GDR candidate=
s but with the modulo hashing algorithm the load balancing becomes less eve=
n with odd number of routers similar to XOR bitwise source/destination hash=
.=C2=A0

So the issue is that with even routers you=
 do achieve close to 100% load balancing which means a very close 50/50 spl=
it between the two routers with the hashing algorithm.=C2=A0 So even in tha=
t scenario if one of the 2 routers doing down instead of having to reconver=
ge 100% of all of you traffic you reconverge only 50% so the impact is only=
 50% of your traffic volume.=C2=A0 As you increase the number of routers th=
e load is split between routers however and so the impact is diminished but=
 not eliminated and of course with odd number routers 3 =C2=A05 7 etc you h=
ave uneven load balancing so more impact and with even 2 4 6 close to perfe=
ct split of load balancing.

So bottom line is that=
 traffic is on the router that went down has to reconverge be taken over or=
 split hashed onto the other remaining routers so the from my point of view=
 their is still definitely improvements gains with tight PIM timers with BF=
D single hop asynchronous mode to get as close to hitless convergence.=C2=
=A0 The P2MP RFCs are strictly for labels switched multicast multipoint LSP=
 with mLDP or P2MP TE P2MP or MP2MP MDT strictly for MVPN scenarios and can=
not be applied to LAN.

Gyan

Sent from my iPhone=


On Oct 16, 2019, at 10:23 PM, Greg Mirsky <gregimirsky@gmail.=
com> wrote:

=

Hi=C2=A0Gyan,
thank you for bringing=C2=A0draft-ietf-p=
im-drlb to my attention (I'm following=C2=A0discussions in PIM WG but w=
as not aware of this use case). Also, I appreciate you sharing your thought=
s on the applicability of RFCs 8562 and 8563 to the GDR use case. With the =
current scenario, as I understand=C2=A0it, there could be more than two GDR=
 Candidates on the given LAN segment. Let us assume that there three such r=
outers. If one is elected as GDR and another as GBDR, then third is GDROthe=
r. If that is=C2=A0the case, then the mechanism described for DR/BDR/DROthe=
r in=C2=A0draft-ietf-pim-bfd-p2mp-use-case can be used for expedited conver=
gence of GDR/GDBR/GDROther. Would you agree?

Regar=
ds,
Greg

On Tue, Oct 15, 2019 at 9:10 PM Gyan Mishra <hayabusagsm@gmail.c=
om> wrote:

Greg=C2=A0

+ Ma=
nkamana and Benchon=C2=A0

...from PIM WG & BESS whic=
h owns LSM MVPN mLDP / P2MP TE S-PMSI and MI-PMSI.

We we=
re discussing PIM BFD use case on this BFD WG thread =C2=A0and =C2=A0RFC 85=
62 and RFC 8563 covers strictly L3 VPN LSM ( label switched Multicast) LMDT=
 (labeled multicast distribution tree) mLDP / P2MP p-tree S-PMSI ( selectiv=
e constrained MDT / Cisco data MDT) MI-PMSI(inclusive MDT for all VRFs) and=
 not Ethernet switching LAN based PIM SM BFD.

We h=
ave a new draft in the PIM WG PIM DRLB load balancing GDR capability and th=
e draft of hashing of ASM PIM RP hash and ASM and SSM S,G hash load balanci=
ng of traffic across both PIM DR/BDR does significantly help with convergen=
ce as 50/50 LB split but during failover you still have 50% of the traffic =
that still has to reconverge and SPT tree MRIB/MFIB state has to rebuild. =
=C2=A0



=


So the BFD PIM Draft would register the PIM protocol an=
d in asynchronous mode with echo disabled we can achieve sub millisecond de=
tection time and convergence during failover.

So I=
 do think we need a PIM BFD Draft.=C2=A0

Since thi=
s falls between multiple WG but since BFD related this would be under the B=
FD WG.

I am part of the BFD WG as well as part of =
PIM and BESS so I can assist in writing the draft if we are all in agreemen=
t that this is needed and can work with=C2=A0Mankamana and Benchon as well in creating the draft.=


=

Gyan=


Sent from my iPhone

On Oct 12, 2019, at 12:07 AM, Greg Mirsky <gregimirsky@gmail.com>=
 wrote:

Hi Gyan,
thank you for your interest in this draft. We've des=
cribed how RFC 8562 BFD for Multipoint Networks=C2=A0can be used to shorte=
n=C2=A0convergence in PIM-SM. The similar scenario discussed in draft-ietf-bess-mvpn-fast-failover=C2=A0where p2mp BFD is =
used by tails to detect the failure of the head/root or the multicast tree.=
 If it is required for the head/root to detect a defect of the multicast tr=
ee toward a tail, we'll turn to RFC 8563 BFD for Multipoint=C2=A0 Active T=
ails=C2=A0as in draft-hu-bier-bfd.
Hope this infor=
mation would be helpful to you. I always welcome your questions.
=

Regards,
Greg

On Fri, Oct 11, 2019 at 7:40 PM=
 Gyan Mishra <hayabusagsm@gmail.com> wrote:
Greg=C2=A0

I saw=
 your draft on PIM BFD use cases but could not find the RFC on PIM BFD.



Gyan
Verizon Communications=C2=A0
Cell-301 502-1347


Sent from my iPhone
On Oct 11, 2019, at 9:53 PM, Gyan Mishra <hayabusagsm@gmail.com> wrote:

=


BFD=
 WG

Anyone know what the RFC or draft for =
PIM BFD support.

Thank you

Gyan 
Verizon Communications 
<=
span>


Sent from my iPhone=







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Subject: Re: PIM BFD RFC
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Sent from my iPhone

> On Oct 17, 2019, at 10:46 AM, Greg Mirsky  wrote:
>=20
> Hi Gyan,
> many thanks for adding more details to the scenario you're discussing. As y=
ou know, p2mp BFD, as defined in RFC 8562 and RFC 8563, operates in the Dema=
nd mode. What are the advantages of using the Asynchronous mode, and I assum=
e that implies using p2p BFD sessions, as in RFC 5881 for single-hop BFD?
>=20
> Regards,
> Greg

I think the big difference is physical medium that in the =E2=80=9Con demand=
=E2=80=9D mode the head is detecting the active rails sending the control pa=
ckets however the medium is limited as the number of tails is limited to the=
 number of egress PEs for the LMDT where on a multiaccess media the numbers c=
an be very large infinite like but also is an always ON scenario as a LAN th=
e medium is always present to send single hop BFD asynchronous or echo to as=
 many PIM routers that exist on that shared media where with an LMDT the med=
ium is a temporary state and only when traffic is flowing is the M2MP or P2M=
P label switched path created and then its torn down once the flow has ended=
 which is why multi hop on demand is perfect for label switched multicast wh=
ere it just won=E2=80=99t work with a LAN based multiaccess bridge domain me=
dium lan switch.

Gyan
>=20
>> On Thu, Oct 17, 2019 at 7:10 AM Gyan Mishra  wrote=
:
>> Greg=20
>>=20
>> That is true that there can be more GDR candidates but with the modulo ha=
shing algorithm the load balancing becomes less even with odd number of rout=
ers similar to XOR bitwise source/destination hash.=20
>>=20
>> So the issue is that with even routers you do achieve close to 100% load b=
alancing which means a very close 50/50 split between the two routers with t=
he hashing algorithm.  So even in that scenario if one of the 2 routers doin=
g down instead of having to reconverge 100% of all of you traffic you reconv=
erge only 50% so the impact is only 50% of your traffic volume.  As you incr=
ease the number of routers the load is split between routers however and so t=
he impact is diminished but not eliminated and of course with odd number rou=
ters 3  5 7 etc you have uneven load balancing so more impact and with even 2=
 4 6 close to perfect split of load balancing.
>>=20
>> So bottom line is that traffic is on the router that went down has to rec=
onverge be taken over or split hashed onto the other remaining routers so th=
e from my point of view their is still definitely improvements gains with ti=
ght PIM timers with BFD single hop asynchronous mode to get as close to hitl=
ess convergence.  The P2MP RFCs are strictly for labels switched multicast m=
ultipoint LSP with mLDP or P2MP TE P2MP or MP2MP MDT strictly for MVPN scena=
rios and cannot be applied to LAN.
>>=20
>> Gyan
>>=20
>> Sent from my iPhone
>>=20
>>> On Oct 16, 2019, at 10:23 PM, Greg Mirsky  wrote:=

>>>=20
>>> Hi Gyan,
>>> thank you for bringing draft-ietf-pim-drlb to my attention (I'm followin=
g discussions in PIM WG but was not aware of this use case). Also, I appreci=
ate you sharing your thoughts on the applicability of RFCs 8562 and 8563 to t=
he GDR use case. With the current scenario, as I understand it, there could b=
e more than two GDR Candidates on the given LAN segment. Let us assume that t=
here three such routers. If one is elected as GDR and another as GBDR, then t=
hird is GDROther. If that is the case, then the mechanism described for DR/B=
DR/DROther in draft-ietf-pim-bfd-p2mp-use-case can be used for expedited con=
vergence of GDR/GDBR/GDROther. Would you agree?
>>>=20
>>> Regards,
>>> Greg
>>>=20
>>>> On Tue, Oct 15, 2019 at 9:10 PM Gyan Mishra  wro=
te:
>>>>=20
>>>> Greg=20
>>>>=20
>>>> + Mankamana and Benchon=20
>>>>=20
>>>> ...from PIM WG & BESS which owns LSM MVPN mLDP / P2MP TE S-PMSI and MI-=
PMSI.
>>>>=20
>>>> We were discussing PIM BFD use case on this BFD WG thread  and  RFC 856=
2 and RFC 8563 covers strictly L3 VPN LSM ( label switched Multicast) LMDT (=
labeled multicast distribution tree) mLDP / P2MP p-tree S-PMSI ( selective c=
onstrained MDT / Cisco data MDT) MI-PMSI(inclusive MDT for all VRFs) and not=
 Ethernet switching LAN based PIM SM BFD.
>>>>=20
>>>> We have a new draft in the PIM WG PIM DRLB load balancing GDR capabilit=
y and the draft of hashing of ASM PIM RP hash and ASM and SSM S,G hash load b=
alancing of traffic across both PIM DR/BDR does significantly help with conv=
ergence as 50/50 LB split but during failover you still have 50% of the traf=
fic that still has to reconverge and SPT tree MRIB/MFIB state has to rebuild=
. =20
>>>>=20
>>>>=20
>>>> https://tools.ietf.org/html/draft-ietf-pim-drlb-11
>>>>=20
>>>>=20
>>>> So the BFD PIM Draft would register the PIM protocol and in asynchronou=
s mode with echo disabled we can achieve sub millisecond detection time and c=
onvergence during failover.
>>>>=20
>>>> So I do think we need a PIM BFD Draft.=20
>>>>=20
>>>> Since this falls between multiple WG but since BFD related this would b=
e under the BFD WG.
>>>>=20
>>>> I am part of the BFD WG as well as part of PIM and BESS so I can assist=
 in writing the draft if we are all in agreement that this is needed and can=
 work with Mankamana and Benchon as well in creating the draft.
>>>>=20
>>>> Gyan
>>>>=20
>>>> Sent from my iPhone
>>>>=20
>>>>> On Oct 12, 2019, at 12:07 AM, Greg Mirsky  wrot=
e:
>>>>>=20
>>>>> Hi Gyan,
>>>>> thank you for your interest in this draft. We've described how RFC 856=
2 BFD for Multipoint Networks can be used to shorten convergence in PIM-SM. T=
he similar scenario discussed in draft-ietf-bess-mvpn-fast-failover where p2=
mp BFD is used by tails to detect the failure of the head/root or the multic=
ast tree. If it is required for the head/root to detect a defect of the mult=
icast tree toward a tail, we'll turn to RFC 8563 BFD for Multipoint  Active T=
ails as in draft-hu-bier-bfd.
>>>>> Hope this information would be helpful to you. I always welcome your q=
uestions.
>>>>>=20
>>>>> Regards,
>>>>> Greg
>>>>>=20
>>>>>> On Fri, Oct 11, 2019 at 7:40 PM Gyan Mishra  w=
rote:
>>>>>> Greg=20
>>>>>>=20
>>>>>> I saw your draft on PIM BFD use cases but could not find the RFC on P=
IM BFD.
>>>>>>=20
>>>>>>=20
>>>>>> https://tools.ietf.org/id/draft-mirsky-pim-bfd-p2mp-use-case-02.html
>>>>>>=20
>>>>>> Thanks=20
>>>>>>=20
>>>>>> Gyan
>>>>>> Verizon Communications=20
>>>>>> Cell-301 502-1347
>>>>>>=20
>>>>>>=20
>>>>>> Sent from my iPhone
>>>>>>=20
>>>>>>> On Oct 11, 2019, at 9:53 PM, Gyan Mishra  wro=
te:
>>>>>>>=20
>>>>>>>=20
>>>>>>> BFD WG
>>>>>>>=20
>>>>>>> Anyone know what the RFC or draft for PIM BFD support.
>>>>>>>=20
>>>>>>> Thank you
>>>>>>>=20
>>>>>>> Gyan=20
>>>>>>> Verizon Communications=20
>>>>>>>=20
>>>>>>>=20
>>>>>>>=20
>>>>>>> Sent from my iPhone

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Sent from my iPhone

On Oct 17, 2019, at 10:4=
6 AM, Greg Mirsky <gregimirsky@g=
mail.com> wrote:

Hi Gyan,
many thanks for adding more details to the=
 scenario you're discussing. As you know, p2mp BFD, as defined in RFC 8562 a=
nd RFC 8563, operates in the Demand mode. What are the advantages of using t=
he Asynchronous mode, and I assume that implies using p2p BFD sessions, as i=
n RFC 5881 for single-hop BFD?

Regards,
G=
reg

I think the big difference i=
s physical medium that in the =E2=80=9Con demand=E2=80=9D mode the head is d=
etecting the active rails sending the control packets however the medium is l=
imited as the number of tails is limited to the number of egress PEs for the=
 LMDT where on a multiaccess media the numbers can be very large infinite li=
ke but also is an always ON scenario as a LAN the medium is always present t=
o send single hop BFD asynchronous or echo to as many PIM routers that exist=
 on that shared media where with an LMDT the medium is a temporary state and=
 only when traffic is flowing is the M2MP or P2MP label switched path create=
d and then its torn down once the flow has ended which is why multi hop on d=
emand is perfect for label switched multicast where it just won=E2=80=99t wo=
rk with a LAN based multiaccess bridge domain medium lan switch.

Gyan

On Thu, Oct 17, 2019 at 7=
:10 AM Gyan Mishra <hayabusagsm@=
gmail.com> wrote:
Greg 

That is true that the=
re can be more GDR candidates but with the modulo hashing algorithm the load=
 balancing becomes less even with odd number of routers similar to XOR bitwi=
se source/destination hash. 

So the issue is t=
hat with even routers you do achieve close to 100% load balancing which mean=
s a very close 50/50 split between the two routers with the hashing algorith=
m.  So even in that scenario if one of the 2 routers doing down instead=
 of having to reconverge 100% of all of you traffic you reconverge only 50% s=
o the impact is only 50% of your traffic volume.  As you increase the n=
umber of routers the load is split between routers however and so the impact=
 is diminished but not eliminated and of course with odd number routers 3 &n=
bsp;5 7 etc you have uneven load balancing so more impact and with even 2 4 6=
 close to perfect split of load balancing.

So botto=
m line is that traffic is on the router that went down has to reconverge be t=
aken over or split hashed onto the other remaining routers so the from my po=
int of view their is still definitely improvements gains with tight PIM time=
rs with BFD single hop asynchronous mode to get as close to hitless converge=
nce.  The P2MP RFCs are strictly for labels switched multicast multipoi=
nt LSP with mLDP or P2MP TE P2MP or MP2MP MDT strictly for MVPN scenarios an=
d cannot be applied to LAN.

Gyan

Sent from my iPh=
one

On Oct 16, 2019, at 10:23 PM, Greg Mirsky <=
gregimirsky@gmail=
.com> wrote:

=

Hi Gyan,
thank you for bringing draft-ietf-pi=
m-drlb to my attention (I'm following discussions in PIM WG but was not=
 aware of this use case). Also, I appreciate you sharing your thoughts on th=
e applicability of RFCs 8562 and 8563 to the GDR use case. With the current s=
cenario, as I understand it, there could be more than two GDR Candidate=
s on the given LAN segment. Let us assume that there three such routers. If o=
ne is elected as GDR and another as GBDR, then third is GDROther. If that is=
 the case, then the mechanism described for DR/BDR/DROther in draf=
t-ietf-pim-bfd-p2mp-use-case can be used for expedited convergence of GDR/GD=
BR/GDROther. Would you agree?

Regards,
Gr=
eg

On Tue, Oct 15, 2019 at 9:10 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:
<=
div>
Greg 

+ Mankamana and Benchon&nb=
sp;

...from PIM WG & BESS which owns LSM MVPN mLDP / P=
2MP TE S-PMSI and MI-PMSI.

We were discussing PIM BFD use=
 case on this BFD WG thread  and  RFC 8562 and RFC 8563 covers str=
ictly L3 VPN LSM ( label switched Multicast) LMDT (labeled multicast distrib=
ution tree) mLDP / P2MP p-tree S-PMSI ( selective constrained MDT / Cisco da=
ta MDT) MI-PMSI(inclusive MDT for all VRFs) and not Ethernet switching LAN b=
ased PIM SM BFD.

We have a new draft in the PIM WG P=
IM DRLB load balancing GDR capability and the draft of hashing of ASM PIM RP=
 hash and ASM and SSM S,G hash load balancing of traffic across both PIM DR/=
BDR does significantly help with convergence as 50/50 LB split but during fa=
ilover you still have 50% of the traffic that still has to reconverge and SP=
T tree MRIB/MFIB state has to rebuild.  


<=
/div>


So the BFD PIM Draft wo=
uld register the PIM protocol and in asynchronous mode with echo disabled we=
 can achieve sub millisecond detection time and convergence during failover.=


So I do think we need a PIM BFD Draft. 
=


Since this falls between multiple WG but since BFD relat=
ed this would be under the BFD WG.

I am part of the=
 BFD WG as well as part of PIM and BESS so I can assist in writing the draft=
 if we are all in agreement that this is needed and can work with Mankamana and Benchon as wel=
l in creating the draft.

Gyan

Sent from m=
y iPhone

On Oct 12, 2019, at 12:07 AM, Greg Mirsky=
 <gregimirsky@=
gmail.com> wrote:

Hi Gyan,
thank you for your interest in this draft=
. We've described how RFC 8562 BFD for Multipoint Networks can be used t=
o shorten convergence in PIM-SM. The similar scenario discussed in draft-ietf-bess-mvpn-fast-failover where p2mp BFD=
 is used by tails to detect the failure of the head/root or the multicast tr=
ee. If it is required for the head/root to detect a defect of the multicast t=
ree toward a tail, we'll turn to RFC 8563 BFD for Multipoint  Active Tails<=
/a> as in draft-hu-bier-bfd.
Hope this information w=
ould be helpful to you. I always welcome your questions.

Regards,
Greg

On Fri, Oct 11, 2019 at 7:40 PM Gyan Mishr=
a <hayabusagsm=
@gmail.com> wrote:
Greg 

I saw your draft on P=
IM BFD use cases but could not find the RFC on PIM BFD.

=



Gyan
Verizon Communications 
Cell-301 502-=
1347


Sent from my iPhone

On Oct 11, 2019, at 9:53=
 PM, Gyan Mishra <hayabusagsm@gmail.com> wrote:


BFD WG
Anyone know what the RFC or draft for PIM BFD support.

Thank you

Gyan <=
br>Verizon Communications 


Sent from my iPhone






=

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From: Gyan Mishra 
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Sent from my iPhone

> On Oct 17, 2019, at 12:20 PM, Albert Fu (BLOOMBERG/ 120 PARK)  wrote:
>=20
> Hi Robert,
>=20
> > Dear WG,
> >=20
> > Thank you Gyan for your note.
> >
> > It very clearly highlights my primary concern expressed earlier of false=

> > assumptions on how engineers may try to (mis)use bfd-large in multihop
> > cases.
> >
> > Below note is a brilliant example of how one may not realize that actual=

> > paths BFD packets take can be just a fraction of paths their data plane o=
r
> > even other control plane packets may traverse over a network or set of
> > networks.
> >
> > I am always concerned when protocol extensions being standardized are kn=
own
> > to only work in 1 out of 10 deployment scenarios and when chances of suc=
h
> > opportunity of incorrect use are evident yet no safety inline fuse exist=
.
> >=20
> > Many thx,
> > Robert.
>=20
> As mentioned previously, there are well known cases where BFD can not dete=
rmine data plane error, and this is not unique to the BFD Large Packet Draft=
.
>=20
> I do not know how other customers use BFD, but can say that in our network=
, almost all of our BFD use cases are P2P (IGP/eBGP) (and also Control-plane=
 independent), where BFD Large Packet draft will be very useful and determin=
istic in identifying the issue as it happens.
>=20
> Thanks
> Albert
>=20
[Gyan] In all the use cases to date working with customer networks my experi=
ence has always been for single hop BFD using echo or asynchronous mode used=
 for direct eBGP or ospf or isis p2p links.  I agree my thoughts were that t=
his would be a good tool to help where traditional pmtud may have failed but=
 for the network planner have an idea if IPv6 or any other technology that h=
ad a lot of overhead or is built on overlay /underlay technologies.  The onl=
y use case for multi hop BFD demand mode is for MVPN P2MP LSP LMDT which is a=
 different animal all together.
>=20

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Sent from my iPhone

On Oct 17, 2019, at 12:2=
0 PM, Albert Fu (BLOOMBERG/ 120 PARK) <afu14@bloomberg.net> wrote:

Hi Robert,=

> Dear WG,
> 
> Thank you Gyan for your note.
>
>=
; It very clearly highlights my primary concern expressed earlier of false> assumptions on how engineers may try to (mis)use bfd-large in multiho=
p
> cases.
>
> Below note is a brilliant example of how on=
e may not realize that actual
> paths BFD packets take can be just a f=
raction of paths their data plane or
> even other control plane packet=
s may traverse over a network or set of
> networks.
>
> I a=
m always concerned when protocol extensions being standardized are known
=
> to only work in 1 out of 10 deployment scenarios and when chances of su=
ch
> opportunity of incorrect use are evident yet no safety inline fus=
e exist.
> 
> Many thx,
> Robert.

As mentioned prev=
iously, there are well known cases where BFD can not determine data plane er=
ror, and this is not unique to the BFD Large Packet Draft.

I do not know how other customers use BFD=
, but can say that in our network, almost all of our BFD use cases are P2P (=
IGP/eBGP) (and also Control-plane independent), where BFD Large Packet draft=
 will be very useful and deterministic in identifying the issue as it happen=
s.

Thanks
<=
blockquote>Albert

[Gyan] In all the use cases to date working with customer netw=
orks my experience has always been for single hop BFD using echo or asynchro=
nous mode used for direct eBGP or ospf or isis p2p links.  I agree my t=
houghts were that this would be a good tool to help where traditional pmtud m=
ay have failed but for the network planner have an idea if IPv6 or any other=
 technology that had a lot of overhead or is built on overlay /underlay tech=
nologies.  The only use case for multi hop BFD demand mode is for MVPN P=
2MP LSP LMDT which is a different animal all together.
=

=

--Apple-Mail-EFF0251B-DEC5-4F32-B5EA-1D4F83F0D8B6--


From nobody Fri Oct 18 09:40:02 2019
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From: Jeffrey Haas 
To: Gyan Mishra 
Cc: Greg Mirsky , rtg-bfd WG , mankamis@cisco.com, xu.benchong@zte.com.cn
Subject: Re: PIM BFD RFCOGyan,
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Gyan,

On Wed, Oct 16, 2019 at 12:10:25AM -0400, Gyan Mishra wrote:
> https://tools.ietf.org/html/draft-ietf-pim-drlb-11
> 
> 
> So the BFD PIM Draft would register the PIM protocol and in asynchronous mode with echo disabled we can achieve sub millisecond detection time and convergence during failover.
> 
> So I do think we need a PIM BFD Draft. 
> 
> Since this falls between multiple WG but since BFD related this would be under the BFD WG.

Generally, when we're talking about whether a draft that utilizes BFD
belongs in BFD or not, the deciding criteria is usually whether there's
changes to the BFD protocol itself.

I believe in these cases we'd be making use of existing p2mp BFD procedures
rather than extending them.  In that case, we'd normally suggest the work
live in the related protocol Working Group.

Part of BFD's charter is to help review uses of BFD in such protocols, so
even if the work was happening in the related multicast working groups, the
chairs of those groups are welcome to request simultaneous review in BFD
during last call.

-- Jeff


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From: Gyan Mishra 
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Subject: Re: PIM BFD RFCOGyan,
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To: Jeffrey Haas 
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Thank you=20

Thank you for clarification on which WG should initiate the draft.

I will work with the PIM WG and engage BFD WG as necessary during Last Call.=


Gyan

Sent from my iPhone

> On Oct 18, 2019, at 12:43 PM, Jeffrey Haas  wrote:
>=20
> Gyan,
>=20
>> On Wed, Oct 16, 2019 at 12:10:25AM -0400, Gyan Mishra wrote:
>> https://tools.ietf.org/html/draft-ietf-pim-drlb-11
>>=20
>>=20
>> So the BFD PIM Draft would register the PIM protocol and in asynchronous m=
ode with echo disabled we can achieve sub millisecond detection time and con=
vergence during failover.
>>=20
>> So I do think we need a PIM BFD Draft.=20
>>=20
>> Since this falls between multiple WG but since BFD related this would be u=
nder the BFD WG.
>=20
> Generally, when we're talking about whether a draft that utilizes BFD
> belongs in BFD or not, the deciding criteria is usually whether there's
> changes to the BFD protocol itself.
>=20
> I believe in these cases we'd be making use of existing p2mp BFD procedure=
s
> rather than extending them.  In that case, we'd normally suggest the work
> live in the related protocol Working Group.
>=20
> Part of BFD's charter is to help review uses of BFD in such protocols, so
> even if the work was happening in the related multicast working groups, th=
e
> chairs of those groups are welcome to request simultaneous review in BFD
> during last call.
>=20
> -- Jeff


From nobody Mon Oct 21 14:05:23 2019
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Date: Mon, 21 Oct 2019 17:07:52 -0400
From: Jeffrey Haas 
To: Santosh P K 
Cc: xiao.min2@zte.com.cn, Greg Mirsky , draft-ietf-bfd-vxlan@ietf.org, Dinesh Dutt , rtg-bfd WG , Joel Halpern , "T. Sridhar" , bfd-chairs@ietf.org, nvo3@ietf.org
Subject: Re: BFD over VXLAN: Trapping BFD Control packet at VTEP
Message-ID: <20191021210752.GA8916@pfrc.org>
References:  <201909251039413767352@zte.com.cn> 
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Santosh and others,

On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>    Thanks for your explanation. This helps a lot. I would wait for more
> comments from others to see if this what we need in this draft to be
> supported based on that we can provide appropriate sections in the draft.

The threads on the list have spidered to the point where it is challenging
to follow what the current status of the draft is, or should be.  :-)

However, if I've followed things properly, the question below is really the
hinge point on what our encapsulation for BFD over vxlan should look like.
Correct?

Essentially, do we or do we not require the ability to permit multiple BFD
sessions between distinct VAPs?

If this is so, do we have a sense as to how we should proceed?  

-- Jeff

[context preserved below...]

> Santosh P K
> 
> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
> 
> > Hi Santosh,
> >
> >
> > With regard to the question whether we should allow multiple BFD sessions
> > for the same VNI or not, IMHO we should allow it, more explanation as
> > follows.
> >
> > Below is a figure derived from figure 2 of RFC8014 (An Architecture for
> > Data-Center Network Virtualization over Layer 3 (NVO3)).
> >
> >                     |         Data Center Network (IP)        |
> >                     |                                         |
> >                     +-----------------------------------------+
> >                          |                           |
> >                          |       Tunnel Overlay      |
> >             +------------+---------+       +---------+------------+
> >             | +----------+-------+ |       | +-------+----------+ |
> >             | |  Overlay Module  | |       | |  Overlay Module  | |
> >             | +---------+--------+ |       | +---------+--------+ |
> >             |           |          |       |           |          |
> >      NVE1   |           |          |       |           |          | NVE2
> >             |  +--------+-------+  |       |  +--------+-------+  |
> >             |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
> >             |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
> >             |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
> >             +----+-----+----+------+       +----+-----+-----+-----+
> >                  |     |    |                   |     |     |
> >                  |     |    |                   |     |     |
> >                  |     |    |                   |     |     |
> >           -------+-----+----+-------------------+-----+-----+-------
> >                  |     |    |     Tenant        |     |     |
> >             TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
> >                 +---+ +---+ +---+             +---+ +---+   +---+
> >                 |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
> >                 +---+ +---+ +---+             +---+ +---+   +---+
> >
> > To my understanding, the BFD sessions between NVE1 and NVE2 are actually
> > initiated and terminated at VAP of NVE.
> >
> > If the network operator want to set up one BFD session between VAP1 of
> > NVE1 and VAP1of NVE2, at the same time another BFD session between VAP3 of
> > NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same
> > VNI1, I believe it's reasonable, so that's why I think we should allow it


From nobody Tue Oct 22 06:06:13 2019
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Subject: Re: BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Jeffrey Haas , Santosh P K 
Cc: xiao.min2@zte.com.cn, Greg Mirsky , draft-ietf-bfd-vxlan@ietf.org, Dinesh Dutt , rtg-bfd WG , "T. Sridhar" , nvo3@ietf.org
References:  <201909251039413767352@zte.com.cn>  <20191021210752.GA8916@pfrc.org>
From: "Joel M. Halpern" 
Message-ID: <0e99a541-b2ca-85d4-4a8f-1165cf7ac01e@joelhalpern.com>
Date: Tue, 22 Oct 2019 09:05:58 -0400
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 From what I can tell, there are two separate problems.
The document we have is a VTEP-VTEP monitoring document.  There is no 
need for that document to handle the multiple VNI case.
If folks want a protocol for doing BFD monitoring of things behind the 
VTEPs (multiple VNIs), then do that as a separate document.   The 
encoding will be a tenant encoding, and thus sesparate from what is 
defined in this document.

Yours,
Joel

On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
> Santosh and others,
> 
> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>     Thanks for your explanation. This helps a lot. I would wait for more
>> comments from others to see if this what we need in this draft to be
>> supported based on that we can provide appropriate sections in the draft.
> 
> The threads on the list have spidered to the point where it is challenging
> to follow what the current status of the draft is, or should be.  :-)
> 
> However, if I've followed things properly, the question below is really the
> hinge point on what our encapsulation for BFD over vxlan should look like.
> Correct?
> 
> Essentially, do we or do we not require the ability to permit multiple BFD
> sessions between distinct VAPs?
> 
> If this is so, do we have a sense as to how we should proceed?
> 
> -- Jeff
> 
> [context preserved below...]
> 
>> Santosh P K
>>
>> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>
>>> Hi Santosh,
>>>
>>>
>>> With regard to the question whether we should allow multiple BFD sessions
>>> for the same VNI or not, IMHO we should allow it, more explanation as
>>> follows.
>>>
>>> Below is a figure derived from figure 2 of RFC8014 (An Architecture for
>>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>
>>>                      |         Data Center Network (IP)        |
>>>                      |                                         |
>>>                      +-----------------------------------------+
>>>                           |                           |
>>>                           |       Tunnel Overlay      |
>>>              +------------+---------+       +---------+------------+
>>>              | +----------+-------+ |       | +-------+----------+ |
>>>              | |  Overlay Module  | |       | |  Overlay Module  | |
>>>              | +---------+--------+ |       | +---------+--------+ |
>>>              |           |          |       |           |          |
>>>       NVE1   |           |          |       |           |          | NVE2
>>>              |  +--------+-------+  |       |  +--------+-------+  |
>>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
>>>              |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
>>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
>>>              +----+-----+----+------+       +----+-----+-----+-----+
>>>                   |     |    |                   |     |     |
>>>                   |     |    |                   |     |     |
>>>                   |     |    |                   |     |     |
>>>            -------+-----+----+-------------------+-----+-----+-------
>>>                   |     |    |     Tenant        |     |     |
>>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>
>>> To my understanding, the BFD sessions between NVE1 and NVE2 are actually
>>> initiated and terminated at VAP of NVE.
>>>
>>> If the network operator want to set up one BFD session between VAP1 of
>>> NVE1 and VAP1of NVE2, at the same time another BFD session between VAP3 of
>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same
>>> VNI1, I believe it's reasonable, so that's why I think we should allow it


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In-Reply-To: 
From: Greg Mirsky 
Date: Tue, 22 Oct 2019 14:17:30 -0400
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani 
Cc: "Joel M. Halpern" , Jeffrey Haas ,  Santosh P K , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, Dinesh Dutt ,  rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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--000000000000e91860059583d06a
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Hi Anoop, et al.,
I agree with your understanding of what is being defined in the current
version of the BFD over VxLAN specification. But, as I understand, the WG
is discussing the scope before the WGLC is closed. I believe there are
three options:

   1. single BFD session between two VTEPs
   2. single BFD session per VNI between two VTEPs
   3. multiple BFD sessions per VNI between two VTEPs

The current text reflects #2. Is WG accepts this scope? If not, which
option WG would accept?

Regards,
Greg

On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
wrote:

> I concur with Joel's assessment with the following clarifications.
>
> The current document is already capable of monitoring multiple VNIs
> between VTEPs.
>
> The issue under discussion was how do we use BFD to monitor multiple VAPs
> that use the same VNI between a pair of VTEPs.  The use case for this is
> not clear to me, as from my understanding, we cannot have a situation with
> multiple VAPs using the same VNI--there is 1:1 mapping between VAP and VNI.
>
> Anoop
>
> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
> wrote:
>
>>  From what I can tell, there are two separate problems.
>> The document we have is a VTEP-VTEP monitoring document.  There is no
>> need for that document to handle the multiple VNI case.
>> If folks want a protocol for doing BFD monitoring of things behind the
>> VTEPs (multiple VNIs), then do that as a separate document.   The
>> encoding will be a tenant encoding, and thus sesparate from what is
>> defined in this document.
>>
>> Yours,
>> Joel
>>
>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>> > Santosh and others,
>> >
>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>> >>     Thanks for your explanation. This helps a lot. I would wait for
>> more
>> >> comments from others to see if this what we need in this draft to be
>> >> supported based on that we can provide appropriate sections in the
>> draft.
>> >
>> > The threads on the list have spidered to the point where it is
>> challenging
>> > to follow what the current status of the draft is, or should be.  :-)
>> >
>> > However, if I've followed things properly, the question below is really
>> the
>> > hinge point on what our encapsulation for BFD over vxlan should look
>> like.
>> > Correct?
>> >
>> > Essentially, do we or do we not require the ability to permit multiple
>> BFD
>> > sessions between distinct VAPs?
>> >
>> > If this is so, do we have a sense as to how we should proceed?
>> >
>> > -- Jeff
>> >
>> > [context preserved below...]
>> >
>> >> Santosh P K
>> >>
>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>> >>
>> >>> Hi Santosh,
>> >>>
>> >>>
>> >>> With regard to the question whether we should allow multiple BFD
>> sessions
>> >>> for the same VNI or not, IMHO we should allow it, more explanation as
>> >>> follows.
>> >>>
>> >>> Below is a figure derived from figure 2 of RFC8014 (An Architecture
>> for
>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>> >>>
>> >>>                      |         Data Center Network (IP)        |
>> >>>                      |                                         |
>> >>>                      +-----------------------------------------+
>> >>>                           |                           |
>> >>>                           |       Tunnel Overlay      |
>> >>>              +------------+---------+       +---------+------------+
>> >>>              | +----------+-------+ |       | +-------+----------+ |
>> >>>              | |  Overlay Module  | |       | |  Overlay Module  | |
>> >>>              | +---------+--------+ |       | +---------+--------+ |
>> >>>              |           |          |       |           |          |
>> >>>       NVE1   |           |          |       |           |          |
>> NVE2
>> >>>              |  +--------+-------+  |       |  +--------+-------+  |
>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
>> >>>              |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
>> >>>              +----+-----+----+------+       +----+-----+-----+-----+
>> >>>                   |     |    |                   |     |     |
>> >>>                   |     |    |                   |     |     |
>> >>>                   |     |    |                   |     |     |
>> >>>            -------+-----+----+-------------------+-----+-----+-------
>> >>>                   |     |    |     Tenant        |     |     |
>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>> >>>
>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>> actually
>> >>> initiated and terminated at VAP of NVE.
>> >>>
>> >>> If the network operator want to set up one BFD session between VAP1 of
>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session between
>> VAP3 of
>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same
>> >>> VNI1, I believe it's reasonable, so that's why I think we should
>> allow it
>>
>> _______________________________________________
>> nvo3 mailing list
>> nvo3@ietf.org
>> https://www.ietf.org/mailman/listinfo/nvo3
>>
>

--000000000000e91860059583d06a
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Anoop, et al.,
I agree with your understanding of w=
hat is being defined in the current version of the BFD over VxLAN specifica=
tion. But, as I understand, the WG is discussing the scope before the WGLC =
is closed. I believe there are three options:
  1. single BFD =
session between two VTEPs
  2. single BFD session per VNI between two VT=
EPs
  3. multiple BFD sessions per VNI between two VTEPs
T=
he current text reflects #2. Is WG accepts this scope? If not, which option=
 WG would accept?

Regards,
Greg

On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
=
I concur with Joel's assessment with the following clarifications.
=

The current document is already capable of monitoring multip=
le VNIs between VTEPs.

The issue under discussion =
was how do we use BFD to monitor multiple VAPs that use the same VNI betwee=
n a pair of VTEPs.=C2=A0 The use case for this is not clear to me, as from =
my understanding, we cannot have a situation with multiple VAPs using the s=
ame VNI--there is 1:1 mapping between VAP and VNI.

Anoop

On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> w=
rote:
=C2=A0From=
 what I can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



_______________________________________________

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From: Anoop Ghanwani 
Date: Tue, 22 Oct 2019 11:09:05 -0700
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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: "Joel M. Halpern" 
Cc: Jeffrey Haas , Santosh P K ,  Greg Mirsky , nvo3@ietf.org, draft-ietf-bfd-vxlan@ietf.org,  Dinesh Dutt , rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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I concur with Joel's assessment with the following clarifications.

The current document is already capable of monitoring multiple VNIs between
VTEPs.

The issue under discussion was how do we use BFD to monitor multiple VAPs
that use the same VNI between a pair of VTEPs.  The use case for this is
not clear to me, as from my understanding, we cannot have a situation with
multiple VAPs using the same VNI--there is 1:1 mapping between VAP and VNI.

Anoop

On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern  wrote:

>  From what I can tell, there are two separate problems.
> The document we have is a VTEP-VTEP monitoring document.  There is no
> need for that document to handle the multiple VNI case.
> If folks want a protocol for doing BFD monitoring of things behind the
> VTEPs (multiple VNIs), then do that as a separate document.   The
> encoding will be a tenant encoding, and thus sesparate from what is
> defined in this document.
>
> Yours,
> Joel
>
> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
> > Santosh and others,
> >
> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
> >>     Thanks for your explanation. This helps a lot. I would wait for more
> >> comments from others to see if this what we need in this draft to be
> >> supported based on that we can provide appropriate sections in the
> draft.
> >
> > The threads on the list have spidered to the point where it is
> challenging
> > to follow what the current status of the draft is, or should be.  :-)
> >
> > However, if I've followed things properly, the question below is really
> the
> > hinge point on what our encapsulation for BFD over vxlan should look
> like.
> > Correct?
> >
> > Essentially, do we or do we not require the ability to permit multiple
> BFD
> > sessions between distinct VAPs?
> >
> > If this is so, do we have a sense as to how we should proceed?
> >
> > -- Jeff
> >
> > [context preserved below...]
> >
> >> Santosh P K
> >>
> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
> >>
> >>> Hi Santosh,
> >>>
> >>>
> >>> With regard to the question whether we should allow multiple BFD
> sessions
> >>> for the same VNI or not, IMHO we should allow it, more explanation as
> >>> follows.
> >>>
> >>> Below is a figure derived from figure 2 of RFC8014 (An Architecture for
> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
> >>>
> >>>                      |         Data Center Network (IP)        |
> >>>                      |                                         |
> >>>                      +-----------------------------------------+
> >>>                           |                           |
> >>>                           |       Tunnel Overlay      |
> >>>              +------------+---------+       +---------+------------+
> >>>              | +----------+-------+ |       | +-------+----------+ |
> >>>              | |  Overlay Module  | |       | |  Overlay Module  | |
> >>>              | +---------+--------+ |       | +---------+--------+ |
> >>>              |           |          |       |           |          |
> >>>       NVE1   |           |          |       |           |          |
> NVE2
> >>>              |  +--------+-------+  |       |  +--------+-------+  |
> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
> >>>              |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
> >>>              +----+-----+----+------+       +----+-----+-----+-----+
> >>>                   |     |    |                   |     |     |
> >>>                   |     |    |                   |     |     |
> >>>                   |     |    |                   |     |     |
> >>>            -------+-----+----+-------------------+-----+-----+-------
> >>>                   |     |    |     Tenant        |     |     |
> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
> >>>
> >>> To my understanding, the BFD sessions between NVE1 and NVE2 are
> actually
> >>> initiated and terminated at VAP of NVE.
> >>>
> >>> If the network operator want to set up one BFD session between VAP1 of
> >>> NVE1 and VAP1of NVE2, at the same time another BFD session between
> VAP3 of
> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same
> >>> VNI1, I believe it's reasonable, so that's why I think we should allow
> it
>
> _______________________________________________
> nvo3 mailing list
> nvo3@ietf.org
> https://www.ietf.org/mailman/listinfo/nvo3
>

--000000000000d73868059583b228
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


I concur with Joel's assessment with =
the following clarifications.

The current document is al=
ready capable of monitoring multiple VNIs between VTEPs.

The issue under discussion was how do we use BFD to monitor multiple=
 VAPs that use the same VNI between a pair of VTEPs.=C2=A0 The use case for=
 this is not clear to me, as from my understanding, we cannot have a situat=
ion with multiple VAPs using the same VNI--there is 1:1 mapping between VAP=
 and VNI.

Anoop

On Tue, Oct 22, 2019 at 6:06 =
AM Joel M. Halpern <jmh@joelhalpe=
rn.com> wrote:
=C2=A0From what I can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Greg Mirsky , Anoop Ghanwani 
Cc: Jeffrey Haas , Santosh P K , NVO3 , draft-ietf-bfd-vxlan@ietf.org, Dinesh Dutt , rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
References:  <201909251039413767352@zte.com.cn>  <20191021210752.GA8916@pfrc.org> <0e99a541-b2ca-85d4-4a8f-1165cf7ac01e@joelhalpern.com>  
From: "Joel M. Halpern" 
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Date: Tue, 22 Oct 2019 15:06:33 -0400
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I do not understand the value of option 2.
Which is why I asked in my initial review to move to option 1.

And option 2 requires stealing MAC addresses from the users, which seems 
to me to be a very bad thing that option 1 avoids.

Yours,
Joel

On 10/22/2019 2:17 PM, Greg Mirsky wrote:
> Hi Anoop, et al.,
> I agree with your understanding of what is being defined in the current 
> version of the BFD over VxLAN specification. But, as I understand, the 
> WG is discussing the scope before the WGLC is closed. I believe there 
> are three options:
> 
>  1. single BFD session between two VTEPs
>  2. single BFD session per VNI between two VTEPs
>  3. multiple BFD sessions per VNI between two VTEPs
> 
> The current text reflects #2. Is WG accepts this scope? If not, which 
> option WG would accept?
> 
> Regards,
> Greg
> 
> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani  > wrote:
> 
>     I concur with Joel's assessment with the following clarifications.
> 
>     The current document is already capable of monitoring multiple VNIs
>     between VTEPs.
> 
>     The issue under discussion was how do we use BFD to monitor multiple
>     VAPs that use the same VNI between a pair of VTEPs.  The use case
>     for this is not clear to me, as from my understanding, we cannot
>     have a situation with multiple VAPs using the same VNI--there is 1:1
>     mapping between VAP and VNI.
> 
>     Anoop
> 
>     On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern      > wrote:
> 
>           From what I can tell, there are two separate problems.
>         The document we have is a VTEP-VTEP monitoring document.  There
>         is no
>         need for that document to handle the multiple VNI case.
>         If folks want a protocol for doing BFD monitoring of things
>         behind the
>         VTEPs (multiple VNIs), then do that as a separate document.   The
>         encoding will be a tenant encoding, and thus sesparate from what is
>         defined in this document.
> 
>         Yours,
>         Joel
> 
>         On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>          > Santosh and others,
>          >
>          > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>          >>     Thanks for your explanation. This helps a lot. I would
>         wait for more
>          >> comments from others to see if this what we need in this
>         draft to be
>          >> supported based on that we can provide appropriate sections
>         in the draft.
>          >
>          > The threads on the list have spidered to the point where it
>         is challenging
>          > to follow what the current status of the draft is, or should
>         be.  :-)
>          >
>          > However, if I've followed things properly, the question below
>         is really the
>          > hinge point on what our encapsulation for BFD over vxlan
>         should look like.
>          > Correct?
>          >
>          > Essentially, do we or do we not require the ability to permit
>         multiple BFD
>          > sessions between distinct VAPs?
>          >
>          > If this is so, do we have a sense as to how we should proceed?
>          >
>          > -- Jeff
>          >
>          > [context preserved below...]
>          >
>          >> Santosh P K
>          >>
>          >> On Wed, Sep 25, 2019 at 8:10 AM          > wrote:
>          >>
>          >>> Hi Santosh,
>          >>>
>          >>>
>          >>> With regard to the question whether we should allow
>         multiple BFD sessions
>          >>> for the same VNI or not, IMHO we should allow it, more
>         explanation as
>          >>> follows.
>          >>>
>          >>> Below is a figure derived from figure 2 of RFC8014 (An
>         Architecture for
>          >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>          >>>
>          >>>                      |         Data Center Network (IP)   
>              |
>          >>>                      |                                     
>             |
>          >>>                     
>         +-----------------------------------------+
>          >>>                           |                           |
>          >>>                           |       Tunnel Overlay      |
>          >>>              +------------+---------+     
>           +---------+------------+
>          >>>              | +----------+-------+ |       |
>         +-------+----------+ |
>          >>>              | |  Overlay Module  | |       | |  Overlay
>         Module  | |
>          >>>              | +---------+--------+ |       |
>         +---------+--------+ |
>          >>>              |           |          |       |           | 
>                  |
>          >>>       NVE1   |           |          |       |           | 
>                  | NVE2
>          >>>              |  +--------+-------+  |       | 
>         +--------+-------+  |
>          >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2
>         VNI1 |  |
>          >>>              |  +-+-----+----+---+  |       | 
>         +-+-----+-----+--+  |
>          >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|   
>           | VAP3|
>          >>>              +----+-----+----+------+     
>           +----+-----+-----+-----+
>          >>>                   |     |    |                   |     |     |
>          >>>                   |     |    |                   |     |     |
>          >>>                   |     |    |                   |     |     |
>          >>>           
>         -------+-----+----+-------------------+-----+-----+-------
>          >>>                   |     |    |     Tenant        |     |     |
>          >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|   
>           |TSI3
>          >>>                  +---+ +---+ +---+             +---+ +---+ 
>           +---+
>          >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5| 
>           |TS6|
>          >>>                  +---+ +---+ +---+             +---+ +---+ 
>           +---+
>          >>>
>          >>> To my understanding, the BFD sessions between NVE1 and NVE2
>         are actually
>          >>> initiated and terminated at VAP of NVE.
>          >>>
>          >>> If the network operator want to set up one BFD session
>         between VAP1 of
>          >>> NVE1 and VAP1of NVE2, at the same time another BFD session
>         between VAP3 of
>          >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are
>         for the same
>          >>> VNI1, I believe it's reasonable, so that's why I think we
>         should allow it
> 
>         _______________________________________________
>         nvo3 mailing list
>         nvo3@ietf.org 
>         https://www.ietf.org/mailman/listinfo/nvo3
> 


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From: John E Drake 
To: "Joel M. Halpern" , Greg Mirsky , Anoop Ghanwani 
CC: Dinesh Dutt , "draft-ietf-bfd-vxlan@ietf.org" , NVO3 , Santosh P K , Jeffrey Haas , rtg-bfd WG , "T. Sridhar" , "xiao.min2@zte.com.cn" 
Subject: RE: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
Thread-Topic: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
Thread-Index: AQHVefXS4eyCOBU6a0uaC7s/Q49HKqdls0cAgAELsQCAAFSxgIAAAloAgAANtICAAAJBoA==
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Date: Tue, 22 Oct 2019 19:15:36 +0000
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References:  <201909251039413767352@zte.com.cn>  <20191021210752.GA8916@pfrc.org> <0e99a541-b2ca-85d4-4a8f-1165cf7ac01e@joelhalpern.com>   <0b45df12-a7c5-3b5c-db59-5a57c8dfd1b7@joelhalpern.com>
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From: Greg Mirsky 
Date: Tue, 22 Oct 2019 15:16:30 -0400
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: "Joel M. Halpern" 
Cc: Anoop Ghanwani , Jeffrey Haas ,  Santosh P K , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, Dinesh Dutt ,  rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Joel,
if the underlay may balance VXLAN between two VTEPs using VNI in addition
to other fields, then Option 2 has a certain value in my opinion.

Regards,
Greg

On Tue, Oct 22, 2019 at 3:06 PM Joel M. Halpern  wrote:

> I do not understand the value of option 2.
> Which is why I asked in my initial review to move to option 1.
>
> And option 2 requires stealing MAC addresses from the users, which seems
> to me to be a very bad thing that option 1 avoids.
>
> Yours,
> Joel
>
> On 10/22/2019 2:17 PM, Greg Mirsky wrote:
> > Hi Anoop, et al.,
> > I agree with your understanding of what is being defined in the current
> > version of the BFD over VxLAN specification. But, as I understand, the
> > WG is discussing the scope before the WGLC is closed. I believe there
> > are three options:
> >
> >  1. single BFD session between two VTEPs
> >  2. single BFD session per VNI between two VTEPs
> >  3. multiple BFD sessions per VNI between two VTEPs
> >
> > The current text reflects #2. Is WG accepts this scope? If not, which
> > option WG would accept?
> >
> > Regards,
> > Greg
> >
> > On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani  > > wrote:
> >
> >     I concur with Joel's assessment with the following clarifications.
> >
> >     The current document is already capable of monitoring multiple VNIs
> >     between VTEPs.
> >
> >     The issue under discussion was how do we use BFD to monitor multiple
> >     VAPs that use the same VNI between a pair of VTEPs.  The use case
> >     for this is not clear to me, as from my understanding, we cannot
> >     have a situation with multiple VAPs using the same VNI--there is 1:1
> >     mapping between VAP and VNI.
> >
> >     Anoop
> >
> >     On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern  >     > wrote:
> >
> >           From what I can tell, there are two separate problems.
> >         The document we have is a VTEP-VTEP monitoring document.  There
> >         is no
> >         need for that document to handle the multiple VNI case.
> >         If folks want a protocol for doing BFD monitoring of things
> >         behind the
> >         VTEPs (multiple VNIs), then do that as a separate document.   The
> >         encoding will be a tenant encoding, and thus sesparate from what
> is
> >         defined in this document.
> >
> >         Yours,
> >         Joel
> >
> >         On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
> >          > Santosh and others,
> >          >
> >          > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
> >          >>     Thanks for your explanation. This helps a lot. I would
> >         wait for more
> >          >> comments from others to see if this what we need in this
> >         draft to be
> >          >> supported based on that we can provide appropriate sections
> >         in the draft.
> >          >
> >          > The threads on the list have spidered to the point where it
> >         is challenging
> >          > to follow what the current status of the draft is, or should
> >         be.  :-)
> >          >
> >          > However, if I've followed things properly, the question below
> >         is really the
> >          > hinge point on what our encapsulation for BFD over vxlan
> >         should look like.
> >          > Correct?
> >          >
> >          > Essentially, do we or do we not require the ability to permit
> >         multiple BFD
> >          > sessions between distinct VAPs?
> >          >
> >          > If this is so, do we have a sense as to how we should proceed?
> >          >
> >          > -- Jeff
> >          >
> >          > [context preserved below...]
> >          >
> >          >> Santosh P K
> >          >>
> >          >> On Wed, Sep 25, 2019 at 8:10 AM  >         > wrote:
> >          >>
> >          >>> Hi Santosh,
> >          >>>
> >          >>>
> >          >>> With regard to the question whether we should allow
> >         multiple BFD sessions
> >          >>> for the same VNI or not, IMHO we should allow it, more
> >         explanation as
> >          >>> follows.
> >          >>>
> >          >>> Below is a figure derived from figure 2 of RFC8014 (An
> >         Architecture for
> >          >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
> >          >>>
> >          >>>                      |         Data Center Network (IP)
> >              |
> >          >>>                      |
> >             |
> >          >>>
> >         +-----------------------------------------+
> >          >>>                           |                           |
> >          >>>                           |       Tunnel Overlay      |
> >          >>>              +------------+---------+
> >           +---------+------------+
> >          >>>              | +----------+-------+ |       |
> >         +-------+----------+ |
> >          >>>              | |  Overlay Module  | |       | |  Overlay
> >         Module  | |
> >          >>>              | +---------+--------+ |       |
> >         +---------+--------+ |
> >          >>>              |           |          |       |           |
> >                  |
> >          >>>       NVE1   |           |          |       |           |
> >                  | NVE2
> >          >>>              |  +--------+-------+  |       |
> >         +--------+-------+  |
> >          >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2
> >         VNI1 |  |
> >          >>>              |  +-+-----+----+---+  |       |
> >         +-+-----+-----+--+  |
> >          >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|
> >           | VAP3|
> >          >>>              +----+-----+----+------+
> >           +----+-----+-----+-----+
> >          >>>                   |     |    |                   |     |
>  |
> >          >>>                   |     |    |                   |     |
>  |
> >          >>>                   |     |    |                   |     |
>  |
> >          >>>
> >         -------+-----+----+-------------------+-----+-----+-------
> >          >>>                   |     |    |     Tenant        |     |
>  |
> >          >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|
> >           |TSI3
> >          >>>                  +---+ +---+ +---+             +---+ +---+
> >           +---+
> >          >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|
> >           |TS6|
> >          >>>                  +---+ +---+ +---+             +---+ +---+
> >           +---+
> >          >>>
> >          >>> To my understanding, the BFD sessions between NVE1 and NVE2
> >         are actually
> >          >>> initiated and terminated at VAP of NVE.
> >          >>>
> >          >>> If the network operator want to set up one BFD session
> >         between VAP1 of
> >          >>> NVE1 and VAP1of NVE2, at the same time another BFD session
> >         between VAP3 of
> >          >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are
> >         for the same
> >          >>> VNI1, I believe it's reasonable, so that's why I think we
> >         should allow it
> >
> >         _______________________________________________
> >         nvo3 mailing list
> >         nvo3@ietf.org 
> >         https://www.ietf.org/mailman/listinfo/nvo3
> >
>

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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Greg Mirsky 
Cc: Anoop Ghanwani , Jeffrey Haas , Santosh P K , NVO3 , draft-ietf-bfd-vxlan@ietf.org, Dinesh Dutt , rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
References:  <201909251039413767352@zte.com.cn>  <20191021210752.GA8916@pfrc.org> <0e99a541-b2ca-85d4-4a8f-1165cf7ac01e@joelhalpern.com>   <0b45df12-a7c5-3b5c-db59-5a57c8dfd1b7@joelhalpern.com> 
From: "Joel M. Halpern" 
Message-ID: <14ec7c38-5a5b-83dd-b4f4-71a29494ebdc@joelhalpern.com>
Date: Tue, 22 Oct 2019 15:30:39 -0400
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As I recall, the VNI is not in the same place nor the same size as the 
TCP / UDP ports.  So it seems very unlikely that it would be used in 
ECMP.  In fact, avoiding that is why VXLAN does interesting things with 
the source UDP port.  Which the BFD can do.  And presumably MUST do if 
it was path matching.

Yours,
Joel

On 10/22/2019 3:16 PM, Greg Mirsky wrote:
> Hi Joel,
> if the underlay may balance VXLAN between two VTEPs using VNI in 
> addition to other fields, then Option 2 has a certain value in my opinion.
> 
> Regards,
> Greg
> 
> On Tue, Oct 22, 2019 at 3:06 PM Joel M. Halpern  > wrote:
> 
>     I do not understand the value of option 2.
>     Which is why I asked in my initial review to move to option 1.
> 
>     And option 2 requires stealing MAC addresses from the users, which
>     seems
>     to me to be a very bad thing that option 1 avoids.
> 
>     Yours,
>     Joel
> 
>     On 10/22/2019 2:17 PM, Greg Mirsky wrote:
>      > Hi Anoop, et al.,
>      > I agree with your understanding of what is being defined in the
>     current
>      > version of the BFD over VxLAN specification. But, as I
>     understand, the
>      > WG is discussing the scope before the WGLC is closed. I believe
>     there
>      > are three options:
>      >
>      >  1. single BFD session between two VTEPs
>      >  2. single BFD session per VNI between two VTEPs
>      >  3. multiple BFD sessions per VNI between two VTEPs
>      >
>      > The current text reflects #2. Is WG accepts this scope? If not,
>     which
>      > option WG would accept?
>      >
>      > Regards,
>      > Greg
>      >
>      > On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani
>     
>      > >> wrote:
>      >
>      >     I concur with Joel's assessment with the following
>     clarifications.
>      >
>      >     The current document is already capable of monitoring
>     multiple VNIs
>      >     between VTEPs.
>      >
>      >     The issue under discussion was how do we use BFD to monitor
>     multiple
>      >     VAPs that use the same VNI between a pair of VTEPs.  The use case
>      >     for this is not clear to me, as from my understanding, we cannot
>      >     have a situation with multiple VAPs using the same VNI--there
>     is 1:1
>      >     mapping between VAP and VNI.
>      >
>      >     Anoop
>      >
>      >     On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern
>     
>      >     >> wrote:
>      >
>      >           From what I can tell, there are two separate problems.
>      >         The document we have is a VTEP-VTEP monitoring document. 
>     There
>      >         is no
>      >         need for that document to handle the multiple VNI case.
>      >         If folks want a protocol for doing BFD monitoring of things
>      >         behind the
>      >         VTEPs (multiple VNIs), then do that as a separate
>     document.   The
>      >         encoding will be a tenant encoding, and thus sesparate
>     from what is
>      >         defined in this document.
>      >
>      >         Yours,
>      >         Joel
>      >
>      >         On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>      >          > Santosh and others,
>      >          >
>      >          > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K
>     wrote:
>      >          >>     Thanks for your explanation. This helps a lot. I
>     would
>      >         wait for more
>      >          >> comments from others to see if this what we need in this
>      >         draft to be
>      >          >> supported based on that we can provide appropriate
>     sections
>      >         in the draft.
>      >          >
>      >          > The threads on the list have spidered to the point
>     where it
>      >         is challenging
>      >          > to follow what the current status of the draft is, or
>     should
>      >         be.  :-)
>      >          >
>      >          > However, if I've followed things properly, the
>     question below
>      >         is really the
>      >          > hinge point on what our encapsulation for BFD over vxlan
>      >         should look like.
>      >          > Correct?
>      >          >
>      >          > Essentially, do we or do we not require the ability to
>     permit
>      >         multiple BFD
>      >          > sessions between distinct VAPs?
>      >          >
>      >          > If this is so, do we have a sense as to how we should
>     proceed?
>      >          >
>      >          > -- Jeff
>      >          >
>      >          > [context preserved below...]
>      >          >
>      >          >> Santosh P K
>      >          >>
>      >          >> On Wed, Sep 25, 2019 at 8:10 AM      
>      >              >> wrote:
>      >          >>
>      >          >>> Hi Santosh,
>      >          >>>
>      >          >>>
>      >          >>> With regard to the question whether we should allow
>      >         multiple BFD sessions
>      >          >>> for the same VNI or not, IMHO we should allow it, more
>      >         explanation as
>      >          >>> follows.
>      >          >>>
>      >          >>> Below is a figure derived from figure 2 of RFC8014 (An
>      >         Architecture for
>      >          >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>      >          >>>
>      >          >>>                      |         Data Center Network (IP)
>      >              |
>      >          >>>                      |
>      >             |
>      >          >>>
>      >         +-----------------------------------------+
>      >          >>>                           |                           |
>      >          >>>                           |       Tunnel Overlay      |
>      >          >>>              +------------+---------+
>      >           +---------+------------+
>      >          >>>              | +----------+-------+ |       |
>      >         +-------+----------+ |
>      >          >>>              | |  Overlay Module  | |       | |  Overlay
>      >         Module  | |
>      >          >>>              | +---------+--------+ |       |
>      >         +---------+--------+ |
>      >          >>>              |           |          |       |       
>         |
>      >                  |
>      >          >>>       NVE1   |           |          |       |       
>         |
>      >                  | NVE2
>      >          >>>              |  +--------+-------+  |       |
>      >         +--------+-------+  |
>      >          >>>              |  |VNI1 VNI2  VNI1 |  |       |  |
>     VNI1 VNI2
>      >         VNI1 |  |
>      >          >>>              |  +-+-----+----+---+  |       |
>      >         +-+-----+-----+--+  |
>      >          >>>              |VAP1| VAP2|    | VAP3 |       |VAP1|
>     VAP2|
>      >           | VAP3|
>      >          >>>              +----+-----+----+------+
>      >           +----+-----+-----+-----+
>      >          >>>                   |     |    |                   | 
>         |     |
>      >          >>>                   |     |    |                   | 
>         |     |
>      >          >>>                   |     |    |                   | 
>         |     |
>      >          >>>
>      >         -------+-----+----+-------------------+-----+-----+-------
>      >          >>>                   |     |    |     Tenant        | 
>         |     |
>      >          >>>              TSI1 | TSI2|    | TSI3          TSI1|
>     TSI2|
>      >           |TSI3
>      >          >>>                  +---+ +---+ +---+             +---+
>     +---+
>      >           +---+
>      >          >>>                  |TS1| |TS2| |TS3|             |TS4|
>     |TS5|
>      >           |TS6|
>      >          >>>                  +---+ +---+ +---+             +---+
>     +---+
>      >           +---+
>      >          >>>
>      >          >>> To my understanding, the BFD sessions between NVE1
>     and NVE2
>      >         are actually
>      >          >>> initiated and terminated at VAP of NVE.
>      >          >>>
>      >          >>> If the network operator want to set up one BFD session
>      >         between VAP1 of
>      >          >>> NVE1 and VAP1of NVE2, at the same time another BFD
>     session
>      >         between VAP3 of
>      >          >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are
>      >         for the same
>      >          >>> VNI1, I believe it's reasonable, so that's why I
>     think we
>      >         should allow it
>      >
>      >         _______________________________________________
>      >         nvo3 mailing list
>      > nvo3@ietf.org       >
>      > https://www.ietf.org/mailman/listinfo/nvo3
>      >
> 


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From: Greg Mirsky 
Date: Tue, 22 Oct 2019 15:55:28 -0400
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: "Joel M. Halpern" 
Cc: Anoop Ghanwani , Jeffrey Haas ,  Santosh P K , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, Dinesh Dutt ,  rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Joel,
RFC 7348 suggests using information from the inner packet to calculate the
value to be used in the Source UDP port number:
      -  Source Port:  It is recommended that the UDP source port number
         be calculated using a hash of fields from the inner packet --
         one example being a hash of the inner Ethernet frame's headers.
         This is to enable a level of entropy for the ECMP/load-
         balancing of the VM-to-VM traffic across the VXLAN overlay.
>From that text, I assume that VNI may be used as input for hashing
function. If BFD over VXLAN doesn't support per VNI BFD session, then it
cannot monitor multiple paths in underlay used to balance VM-to-VM traffic
between the same pair of VTEPs. In my opinion, this is perfectly fine if
that is WG's agreement. I'm glad we are discussing this and will have a
conclusion.

Regards,
Greg

On Tue, Oct 22, 2019 at 3:30 PM Joel M. Halpern  wrote:

> As I recall, the VNI is not in the same place nor the same size as the
> TCP / UDP ports.  So it seems very unlikely that it would be used in
> ECMP.  In fact, avoiding that is why VXLAN does interesting things with
> the source UDP port.  Which the BFD can do.  And presumably MUST do if
> it was path matching.
>
> Yours,
> Joel
>
> On 10/22/2019 3:16 PM, Greg Mirsky wrote:
> > Hi Joel,
> > if the underlay may balance VXLAN between two VTEPs using VNI in
> > addition to other fields, then Option 2 has a certain value in my
> opinion.
> >
> > Regards,
> > Greg
> >
> > On Tue, Oct 22, 2019 at 3:06 PM Joel M. Halpern  > > wrote:
> >
> >     I do not understand the value of option 2.
> >     Which is why I asked in my initial review to move to option 1.
> >
> >     And option 2 requires stealing MAC addresses from the users, which
> >     seems
> >     to me to be a very bad thing that option 1 avoids.
> >
> >     Yours,
> >     Joel
> >
> >     On 10/22/2019 2:17 PM, Greg Mirsky wrote:
> >      > Hi Anoop, et al.,
> >      > I agree with your understanding of what is being defined in the
> >     current
> >      > version of the BFD over VxLAN specification. But, as I
> >     understand, the
> >      > WG is discussing the scope before the WGLC is closed. I believe
> >     there
> >      > are three options:
> >      >
> >      >  1. single BFD session between two VTEPs
> >      >  2. single BFD session per VNI between two VTEPs
> >      >  3. multiple BFD sessions per VNI between two VTEPs
> >      >
> >      > The current text reflects #2. Is WG accepts this scope? If not,
> >     which
> >      > option WG would accept?
> >      >
> >      > Regards,
> >      > Greg
> >      >
> >      > On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani
> >     
> >      > >>
> wrote:
> >      >
> >      >     I concur with Joel's assessment with the following
> >     clarifications.
> >      >
> >      >     The current document is already capable of monitoring
> >     multiple VNIs
> >      >     between VTEPs.
> >      >
> >      >     The issue under discussion was how do we use BFD to monitor
> >     multiple
> >      >     VAPs that use the same VNI between a pair of VTEPs.  The use
> case
> >      >     for this is not clear to me, as from my understanding, we
> cannot
> >      >     have a situation with multiple VAPs using the same VNI--there
> >     is 1:1
> >      >     mapping between VAP and VNI.
> >      >
> >      >     Anoop
> >      >
> >      >     On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern
> >     
> >      >     >>
> wrote:
> >      >
> >      >           From what I can tell, there are two separate problems.
> >      >         The document we have is a VTEP-VTEP monitoring document.
> >     There
> >      >         is no
> >      >         need for that document to handle the multiple VNI case.
> >      >         If folks want a protocol for doing BFD monitoring of
> things
> >      >         behind the
> >      >         VTEPs (multiple VNIs), then do that as a separate
> >     document.   The
> >      >         encoding will be a tenant encoding, and thus sesparate
> >     from what is
> >      >         defined in this document.
> >      >
> >      >         Yours,
> >      >         Joel
> >      >
> >      >         On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
> >      >          > Santosh and others,
> >      >          >
> >      >          > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K
> >     wrote:
> >      >          >>     Thanks for your explanation. This helps a lot. I
> >     would
> >      >         wait for more
> >      >          >> comments from others to see if this what we need in
> this
> >      >         draft to be
> >      >          >> supported based on that we can provide appropriate
> >     sections
> >      >         in the draft.
> >      >          >
> >      >          > The threads on the list have spidered to the point
> >     where it
> >      >         is challenging
> >      >          > to follow what the current status of the draft is, or
> >     should
> >      >         be.  :-)
> >      >          >
> >      >          > However, if I've followed things properly, the
> >     question below
> >      >         is really the
> >      >          > hinge point on what our encapsulation for BFD over
> vxlan
> >      >         should look like.
> >      >          > Correct?
> >      >          >
> >      >          > Essentially, do we or do we not require the ability to
> >     permit
> >      >         multiple BFD
> >      >          > sessions between distinct VAPs?
> >      >          >
> >      >          > If this is so, do we have a sense as to how we should
> >     proceed?
> >      >          >
> >      >          > -- Jeff
> >      >          >
> >      >          > [context preserved below...]
> >      >          >
> >      >          >> Santosh P K
> >      >          >>
> >      >          >> On Wed, Sep 25, 2019 at 8:10 AM  >     
> >      >          >     >> wrote:
> >      >          >>
> >      >          >>> Hi Santosh,
> >      >          >>>
> >      >          >>>
> >      >          >>> With regard to the question whether we should allow
> >      >         multiple BFD sessions
> >      >          >>> for the same VNI or not, IMHO we should allow it,
> more
> >      >         explanation as
> >      >          >>> follows.
> >      >          >>>
> >      >          >>> Below is a figure derived from figure 2 of RFC8014
> (An
> >      >         Architecture for
> >      >          >>> Data-Center Network Virtualization over Layer 3
> (NVO3)).
> >      >          >>>
> >      >          >>>                      |         Data Center Network
> (IP)
> >      >              |
> >      >          >>>                      |
> >      >             |
> >      >          >>>
> >      >         +-----------------------------------------+
> >      >          >>>                           |
>  |
> >      >          >>>                           |       Tunnel Overlay
>   |
> >      >          >>>              +------------+---------+
> >      >           +---------+------------+
> >      >          >>>              | +----------+-------+ |       |
> >      >         +-------+----------+ |
> >      >          >>>              | |  Overlay Module  | |       | |
> Overlay
> >      >         Module  | |
> >      >          >>>              | +---------+--------+ |       |
> >      >         +---------+--------+ |
> >      >          >>>              |           |          |       |
> >         |
> >      >                  |
> >      >          >>>       NVE1   |           |          |       |
> >         |
> >      >                  | NVE2
> >      >          >>>              |  +--------+-------+  |       |
> >      >         +--------+-------+  |
> >      >          >>>              |  |VNI1 VNI2  VNI1 |  |       |  |
> >     VNI1 VNI2
> >      >         VNI1 |  |
> >      >          >>>              |  +-+-----+----+---+  |       |
> >      >         +-+-----+-----+--+  |
> >      >          >>>              |VAP1| VAP2|    | VAP3 |       |VAP1|
> >     VAP2|
> >      >           | VAP3|
> >      >          >>>              +----+-----+----+------+
> >      >           +----+-----+-----+-----+
> >      >          >>>                   |     |    |                   |
> >         |     |
> >      >          >>>                   |     |    |                   |
> >         |     |
> >      >          >>>                   |     |    |                   |
> >         |     |
> >      >          >>>
> >      >         -------+-----+----+-------------------+-----+-----+-------
> >      >          >>>                   |     |    |     Tenant        |
> >         |     |
> >      >          >>>              TSI1 | TSI2|    | TSI3          TSI1|
> >     TSI2|
> >      >           |TSI3
> >      >          >>>                  +---+ +---+ +---+             +---+
> >     +---+
> >      >           +---+
> >      >          >>>                  |TS1| |TS2| |TS3|             |TS4|
> >     |TS5|
> >      >           |TS6|
> >      >          >>>                  +---+ +---+ +---+             +---+
> >     +---+
> >      >           +---+
> >      >          >>>
> >      >          >>> To my understanding, the BFD sessions between NVE1
> >     and NVE2
> >      >         are actually
> >      >          >>> initiated and terminated at VAP of NVE.
> >      >          >>>
> >      >          >>> If the network operator want to set up one BFD
> session
> >      >         between VAP1 of
> >      >          >>> NVE1 and VAP1of NVE2, at the same time another BFD
> >     session
> >      >         between VAP3 of
> >      >          >>> NVE1 and VAP3 of NVE2, although the two BFD sessions
> are
> >      >         for the same
> >      >          >>> VNI1, I believe it's reasonable, so that's why I
> >     think we
> >      >         should allow it
> >      >
> >      >         _______________________________________________
> >      >         nvo3 mailing list
> >      > nvo3@ietf.org   >     >
> >      > https://www.ietf.org/mailman/listinfo/nvo3
> >      >
> >
>

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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Greg Mirsky 
Cc: Anoop Ghanwani , Jeffrey Haas , Santosh P K , NVO3 , draft-ietf-bfd-vxlan@ietf.org, Dinesh Dutt , rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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From: Joel Halpern Direct 
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That is input to the calculation at the VTEP.  It is NOT information 
sued by the network between the VTEPs.

As such, the VTEPs can emulate that by adjusting the source ports that 
it uses for the VFD packets.  The network does not need the VNI to 
actually be varied to achieve this purpose.

Yours,
Joel

On 10/22/2019 3:55 PM, Greg Mirsky wrote:
> Hi Joel,
> RFC 7348 suggests using information from the inner packet to calculate 
> the value to be used in the Source UDP port number:
>        -  Source Port:  It is recommended that the UDP source port number
>           be calculated using a hash of fields from the inner packet --
>           one example being a hash of the inner Ethernet frame's headers.
>           This is to enable a level of entropy for the ECMP/load-
>           balancing of the VM-to-VM traffic across the VXLAN overlay.
>  From that text, I assume that VNI may be used as input for hashing 
> function. If BFD over VXLAN doesn't support per VNI BFD session, then it 
> cannot monitor multiple paths in underlay used to balance VM-to-VM 
> traffic between the same pair of VTEPs. In my opinion, this is perfectly 
> fine if that is WG's agreement. I'm glad we are discussing this and will 
> have a conclusion.
> 
> Regards,
> Greg
> 
> On Tue, Oct 22, 2019 at 3:30 PM Joel M. Halpern  > wrote:
> 
>     As I recall, the VNI is not in the same place nor the same size as the
>     TCP / UDP ports.  So it seems very unlikely that it would be used in
>     ECMP.  In fact, avoiding that is why VXLAN does interesting things with
>     the source UDP port.  Which the BFD can do.  And presumably MUST do if
>     it was path matching.
> 
>     Yours,
>     Joel
> 
>     On 10/22/2019 3:16 PM, Greg Mirsky wrote:
>      > Hi Joel,
>      > if the underlay may balance VXLAN between two VTEPs using VNI in
>      > addition to other fields, then Option 2 has a certain value in my
>     opinion.
>      >
>      > Regards,
>      > Greg
>      >
>      > On Tue, Oct 22, 2019 at 3:06 PM Joel M. Halpern
>     
>      > >> wrote:
>      >
>      >     I do not understand the value of option 2.
>      >     Which is why I asked in my initial review to move to option 1.
>      >
>      >     And option 2 requires stealing MAC addresses from the users,
>     which
>      >     seems
>      >     to me to be a very bad thing that option 1 avoids.
>      >
>      >     Yours,
>      >     Joel
>      >
>      >     On 10/22/2019 2:17 PM, Greg Mirsky wrote:
>      >      > Hi Anoop, et al.,
>      >      > I agree with your understanding of what is being defined
>     in the
>      >     current
>      >      > version of the BFD over VxLAN specification. But, as I
>      >     understand, the
>      >      > WG is discussing the scope before the WGLC is closed. I
>     believe
>      >     there
>      >      > are three options:
>      >      >
>      >      >  1. single BFD session between two VTEPs
>      >      >  2. single BFD session per VNI between two VTEPs
>      >      >  3. multiple BFD sessions per VNI between two VTEPs
>      >      >
>      >      > The current text reflects #2. Is WG accepts this scope? If
>     not,
>      >     which
>      >      > option WG would accept?
>      >      >
>      >      > Regards,
>      >      > Greg
>      >      >
>      >      > On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani
>      >     
>     >
>      >      >            >>> wrote:
>      >      >
>      >      >     I concur with Joel's assessment with the following
>      >     clarifications.
>      >      >
>      >      >     The current document is already capable of monitoring
>      >     multiple VNIs
>      >      >     between VTEPs.
>      >      >
>      >      >     The issue under discussion was how do we use BFD to
>     monitor
>      >     multiple
>      >      >     VAPs that use the same VNI between a pair of VTEPs. 
>     The use case
>      >      >     for this is not clear to me, as from my understanding,
>     we cannot
>      >      >     have a situation with multiple VAPs using the same
>     VNI--there
>      >     is 1:1
>      >      >     mapping between VAP and VNI.
>      >      >
>      >      >     Anoop
>      >      >
>      >      >     On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern
>      >     
>     >
>      >      >                >>> wrote:
>      >      >
>      >      >           From what I can tell, there are two separate
>     problems.
>      >      >         The document we have is a VTEP-VTEP monitoring
>     document.
>      >     There
>      >      >         is no
>      >      >         need for that document to handle the multiple VNI
>     case.
>      >      >         If folks want a protocol for doing BFD monitoring
>     of things
>      >      >         behind the
>      >      >         VTEPs (multiple VNIs), then do that as a separate
>      >     document.   The
>      >      >         encoding will be a tenant encoding, and thus sesparate
>      >     from what is
>      >      >         defined in this document.
>      >      >
>      >      >         Yours,
>      >      >         Joel
>      >      >
>      >      >         On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>      >      >          > Santosh and others,
>      >      >          >
>      >      >          > On Thu, Oct 03, 2019 at 07:50:20PM +0530,
>     Santosh P K
>      >     wrote:
>      >      >          >>     Thanks for your explanation. This helps a
>     lot. I
>      >     would
>      >      >         wait for more
>      >      >          >> comments from others to see if this what we
>     need in this
>      >      >         draft to be
>      >      >          >> supported based on that we can provide appropriate
>      >     sections
>      >      >         in the draft.
>      >      >          >
>      >      >          > The threads on the list have spidered to the point
>      >     where it
>      >      >         is challenging
>      >      >          > to follow what the current status of the draft
>     is, or
>      >     should
>      >      >         be.  :-)
>      >      >          >
>      >      >          > However, if I've followed things properly, the
>      >     question below
>      >      >         is really the
>      >      >          > hinge point on what our encapsulation for BFD
>     over vxlan
>      >      >         should look like.
>      >      >          > Correct?
>      >      >          >
>      >      >          > Essentially, do we or do we not require the
>     ability to
>      >     permit
>      >      >         multiple BFD
>      >      >          > sessions between distinct VAPs?
>      >      >          >
>      >      >          > If this is so, do we have a sense as to how we
>     should
>      >     proceed?
>      >      >          >
>      >      >          > -- Jeff
>      >      >          >
>      >      >          > [context preserved below...]
>      >      >          >
>      >      >          >> Santosh P K
>      >      >          >>
>      >      >          >> On Wed, Sep 25, 2019 at 8:10 AM
>     
>      >     >
>      >      >              
>      >     >>>
>     wrote:
>      >      >          >>
>      >      >          >>> Hi Santosh,
>      >      >          >>>
>      >      >          >>>
>      >      >          >>> With regard to the question whether we should
>     allow
>      >      >         multiple BFD sessions
>      >      >          >>> for the same VNI or not, IMHO we should allow
>     it, more
>      >      >         explanation as
>      >      >          >>> follows.
>      >      >          >>>
>      >      >          >>> Below is a figure derived from figure 2 of
>     RFC8014 (An
>      >      >         Architecture for
>      >      >          >>> Data-Center Network Virtualization over Layer
>     3 (NVO3)).
>      >      >          >>>
>      >      >          >>>                      |         Data Center
>     Network (IP)
>      >      >              |
>      >      >          >>>                      |
>      >      >             |
>      >      >          >>>
>      >      >         +-----------------------------------------+
>      >      >          >>>                           |                 
>               |
>      >      >          >>>                           |       Tunnel
>     Overlay      |
>      >      >          >>>              +------------+---------+
>      >      >           +---------+------------+
>      >      >          >>>              | +----------+-------+ |       |
>      >      >         +-------+----------+ |
>      >      >          >>>              | |  Overlay Module  | |       |
>     |  Overlay
>      >      >         Module  | |
>      >      >          >>>              | +---------+--------+ |       |
>      >      >         +---------+--------+ |
>      >      >          >>>              |           |          |       |
>      >         |
>      >      >                  |
>      >      >          >>>       NVE1   |           |          |       |
>      >         |
>      >      >                  | NVE2
>      >      >          >>>              |  +--------+-------+  |       |
>      >      >         +--------+-------+  |
>      >      >          >>>              |  |VNI1 VNI2  VNI1 |  |       |  |
>      >     VNI1 VNI2
>      >      >         VNI1 |  |
>      >      >          >>>              |  +-+-----+----+---+  |       |
>      >      >         +-+-----+-----+--+  |
>      >      >          >>>              |VAP1| VAP2|    | VAP3 |     
>       |VAP1|
>      >     VAP2|
>      >      >           | VAP3|
>      >      >          >>>              +----+-----+----+------+
>      >      >           +----+-----+-----+-----+
>      >      >          >>>                   |     |    |               
>         |
>      >         |     |
>      >      >          >>>                   |     |    |               
>         |
>      >         |     |
>      >      >          >>>                   |     |    |               
>         |
>      >         |     |
>      >      >          >>>
>      >      >       
>       -------+-----+----+-------------------+-----+-----+-------
>      >      >          >>>                   |     |    |     Tenant   
>          |
>      >         |     |
>      >      >          >>>              TSI1 | TSI2|    | TSI3         
>     TSI1|
>      >     TSI2|
>      >      >           |TSI3
>      >      >          >>>                  +---+ +---+ +---+           
>       +---+
>      >     +---+
>      >      >           +---+
>      >      >          >>>                  |TS1| |TS2| |TS3|           
>       |TS4|
>      >     |TS5|
>      >      >           |TS6|
>      >      >          >>>                  +---+ +---+ +---+           
>       +---+
>      >     +---+
>      >      >           +---+
>      >      >          >>>
>      >      >          >>> To my understanding, the BFD sessions between
>     NVE1
>      >     and NVE2
>      >      >         are actually
>      >      >          >>> initiated and terminated at VAP of NVE.
>      >      >          >>>
>      >      >          >>> If the network operator want to set up one
>     BFD session
>      >      >         between VAP1 of
>      >      >          >>> NVE1 and VAP1of NVE2, at the same time
>     another BFD
>      >     session
>      >      >         between VAP3 of
>      >      >          >>> NVE1 and VAP3 of NVE2, although the two BFD
>     sessions are
>      >      >         for the same
>      >      >          >>> VNI1, I believe it's reasonable, so that's why I
>      >     think we
>      >      >         should allow it
>      >      >
>      >      >         _______________________________________________
>      >      >         nvo3 mailing list
>      >      > nvo3@ietf.org       > 
>      >     >>
>      >      > https://www.ietf.org/mailman/listinfo/nvo3
>      >      >
>      >
> 


From nobody Tue Oct 22 14:46:05 2019
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Date: Wed, 23 Oct 2019 01:17:50 +0500
From: Dinesh Dutt 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Joel Halpern Direct 
Cc: Greg Mirsky , Anoop Ghanwani , Jeffrey Haas , Santosh P K , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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oel,

I'm a tad frustrated that we're rehashing this discussions all over 
again. I specifically explained all the questions that were raised at 
that time. Let me try one last time.

1. BFD for VTEP is only useful for testing VXLAN plumbing, not the 
underlay itself.
2. So, the question is what do we use for VNI and the inner header?
3. The inner header is an IP packet because it is BFD. The IP address 
and the corresponding MAC address used MUST be one that is owned by the 
VTEP in the VNI that is used in the packet

This is sufficient to come up with an implementation that only ever 
tests one VNI or multiple VNIs between thr same pair of VTEPs. It is 
upto the users to decide what VNI, inner MAC and IP to use. The only 
restriction is that the VTEP must own those addresses to (i) prevent 
the packet from leaking to tenants and (ii) allow the tenants 
themselves to be running BFD.

If implementations want to use VNI 1 as the recommended default VNI to 
use, that is fine. But if implementations want to pick more than 1 
because they have a need to do so (I've seen operators do this because 
of their specific use case), then they can as long as they satisfy 
point 3, the draft is done. Why does there need to be any more 
discussion? The draft does need to spell out that using more than VNI 
has scaling issues that the user needs to be aware of, and it does.

Dinesh

On Wed, Oct 23, 2019 at 1:28 AM, Joel Halpern Direct 
 wrote:
> That is input to the calculation at the VTEP.  It is NOT information 
> sued by the network between the VTEPs.
> 
> As such, the VTEPs can emulate that by adjusting the source ports 
> that it uses for the VFD packets.  The network does not need the VNI 
> to actually be varied to achieve this purpose.
> 
> Yours,
> Joel
> 
> On 10/22/2019 3:55 PM, Greg Mirsky wrote:
>> Hi Joel,
>> RFC 7348 suggests using information from the inner packet to 
>> calculate the value to be used in the Source UDP port number:
>>        -  Source Port:  It is recommended that the UDP source port 
>> number
>>           be calculated using a hash of fields from the inner packet 
>> --
>>           one example being a hash of the inner Ethernet frame's 
>> headers.
>>           This is to enable a level of entropy for the ECMP/load-
>>           balancing of the VM-to-VM traffic across the VXLAN overlay.
>>  From that text, I assume that VNI may be used as input for hashing 
>> function. If BFD over VXLAN doesn't support per VNI BFD session, 
>> then it cannot monitor multiple paths in underlay used to balance 
>> VM-to-VM traffic between the same pair of VTEPs. In my opinion, 
>> this is perfectly fine if that is WG's agreement. I'm glad we are 
>> discussing this and will have a conclusion.
>> 
>> Regards,
>> Greg
>> 
>> On Tue, Oct 22, 2019 at 3:30 PM Joel M. Halpern > > wrote:
>> 
>>     As I recall, the VNI is not in the same place nor the same size 
>> as the
>>     TCP / UDP ports.  So it seems very unlikely that it would be 
>> used in
>>     ECMP.  In fact, avoiding that is why VXLAN does interesting 
>> things with
>>     the source UDP port.  Which the BFD can do.  And presumably MUST 
>> do if
>>     it was path matching.
>> 
>>     Yours,
>>     Joel
>> 
>>     On 10/22/2019 3:16 PM, Greg Mirsky wrote:
>>      > Hi Joel,
>>      > if the underlay may balance VXLAN between two VTEPs using VNI 
>> in
>>      > addition to other fields, then Option 2 has a certain value 
>> in my
>>     opinion.
>>      >
>>      > Regards,
>>      > Greg
>>      >
>>      > On Tue, Oct 22, 2019 at 3:06 PM Joel M. Halpern
>>     
>>      > >> 
>> wrote:
>>      >
>>      >     I do not understand the value of option 2.
>>      >     Which is why I asked in my initial review to move to 
>> option 1.
>>      >
>>      >     And option 2 requires stealing MAC addresses from the 
>> users,
>>     which
>>      >     seems
>>      >     to me to be a very bad thing that option 1 avoids.
>>      >
>>      >     Yours,
>>      >     Joel
>>      >
>>      >     On 10/22/2019 2:17 PM, Greg Mirsky wrote:
>>      >      > Hi Anoop, et al.,
>>      >      > I agree with your understanding of what is being 
>> defined
>>     in the
>>      >     current
>>      >      > version of the BFD over VxLAN specification. But, as I
>>      >     understand, the
>>      >      > WG is discussing the scope before the WGLC is closed. I
>>     believe
>>      >     there
>>      >      > are three options:
>>      >      >
>>      >      >  1. single BFD session between two VTEPs
>>      >      >  2. single BFD session per VNI between two VTEPs
>>      >      >  3. multiple BFD sessions per VNI between two VTEPs
>>      >      >
>>      >      > The current text reflects #2. Is WG accepts this 
>> scope? If
>>     not,
>>      >     which
>>      >      > option WG would accept?
>>      >      >
>>      >      > Regards,
>>      >      > Greg
>>      >      >
>>      >      > On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani
>>      >     
>>     >
>>      >      > >      >     >>> wrote:
>>      >      >
>>      >      >     I concur with Joel's assessment with the following
>>      >     clarifications.
>>      >      >
>>      >      >     The current document is already capable of 
>> monitoring
>>      >     multiple VNIs
>>      >      >     between VTEPs.
>>      >      >
>>      >      >     The issue under discussion was how do we use BFD to
>>     monitor
>>      >     multiple
>>      >      >     VAPs that use the same VNI between a pair of 
>> VTEPs.     The use case
>>      >      >     for this is not clear to me, as from my 
>> understanding,
>>     we cannot
>>      >      >     have a situation with multiple VAPs using the same
>>     VNI--there
>>      >     is 1:1
>>      >      >     mapping between VAP and VNI.
>>      >      >
>>      >      >     Anoop
>>      >      >
>>      >      >     On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern
>>      >     
>>     >
>>      >      >     >      >     >>> wrote:
>>      >      >
>>      >      >           From what I can tell, there are two separate
>>     problems.
>>      >      >         The document we have is a VTEP-VTEP monitoring
>>     document.
>>      >     There
>>      >      >         is no
>>      >      >         need for that document to handle the multiple 
>> VNI
>>     case.
>>      >      >         If folks want a protocol for doing BFD 
>> monitoring
>>     of things
>>      >      >         behind the
>>      >      >         VTEPs (multiple VNIs), then do that as a 
>> separate
>>      >     document.   The
>>      >      >         encoding will be a tenant encoding, and thus 
>> sesparate
>>      >     from what is
>>      >      >         defined in this document.
>>      >      >
>>      >      >         Yours,
>>      >      >         Joel
>>      >      >
>>      >      >         On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>      >      >          > Santosh and others,
>>      >      >          >
>>      >      >          > On Thu, Oct 03, 2019 at 07:50:20PM +0530,
>>     Santosh P K
>>      >     wrote:
>>      >      >          >>     Thanks for your explanation. This 
>> helps a
>>     lot. I
>>      >     would
>>      >      >         wait for more
>>      >      >          >> comments from others to see if this what we
>>     need in this
>>      >      >         draft to be
>>      >      >          >> supported based on that we can provide 
>> appropriate
>>      >     sections
>>      >      >         in the draft.
>>      >      >          >
>>      >      >          > The threads on the list have spidered to 
>> the point
>>      >     where it
>>      >      >         is challenging
>>      >      >          > to follow what the current status of the 
>> draft
>>     is, or
>>      >     should
>>      >      >         be.  :-)
>>      >      >          >
>>      >      >          > However, if I've followed things properly, 
>> the
>>      >     question below
>>      >      >         is really the
>>      >      >          > hinge point on what our encapsulation for 
>> BFD
>>     over vxlan
>>      >      >         should look like.
>>      >      >          > Correct?
>>      >      >          >
>>      >      >          > Essentially, do we or do we not require the
>>     ability to
>>      >     permit
>>      >      >         multiple BFD
>>      >      >          > sessions between distinct VAPs?
>>      >      >          >
>>      >      >          > If this is so, do we have a sense as to how 
>> we
>>     should
>>      >     proceed?
>>      >      >          >
>>      >      >          > -- Jeff
>>      >      >          >
>>      >      >          > [context preserved below...]
>>      >      >          >
>>      >      >          >> Santosh P K
>>      >      >          >>
>>      >      >          >> On Wed, Sep 25, 2019 at 8:10 AM
>>     
>>      >     > >
>>      >      >         >     
>>      >     > >>>
>>     wrote:
>>      >      >          >>
>>      >      >          >>> Hi Santosh,
>>      >      >          >>>
>>      >      >          >>>
>>      >      >          >>> With regard to the question whether we 
>> should
>>     allow
>>      >      >         multiple BFD sessions
>>      >      >          >>> for the same VNI or not, IMHO we should 
>> allow
>>     it, more
>>      >      >         explanation as
>>      >      >          >>> follows.
>>      >      >          >>>
>>      >      >          >>> Below is a figure derived from figure 2 of
>>     RFC8014 (An
>>      >      >         Architecture for
>>      >      >          >>> Data-Center Network Virtualization over 
>> Layer
>>     3 (NVO3)).
>>      >      >          >>>
>>      >      >          >>>                      |         Data Center
>>     Network (IP)
>>      >      >              |
>>      >      >          >>>                      |
>>      >      >             |
>>      >      >          >>>
>>      >      >         +-----------------------------------------+
>>      >      >          >>>                           |               
>>                 |
>>      >      >          >>>                           |       Tunnel
>>     Overlay      |
>>      >      >          >>>              +------------+---------+
>>      >      >           +---------+------------+
>>      >      >          >>>              | +----------+-------+ |     
>>   |
>>      >      >         +-------+----------+ |
>>      >      >          >>>              | |  Overlay Module  | |     
>>   |
>>     |  Overlay
>>      >      >         Module  | |
>>      >      >          >>>              | +---------+--------+ |     
>>   |
>>      >      >         +---------+--------+ |
>>      >      >          >>>              |           |          |     
>>   |
>>      >         |
>>      >      >                  |
>>      >      >          >>>       NVE1   |           |          |     
>>   |
>>      >         |
>>      >      >                  | NVE2
>>      >      >          >>>              |  +--------+-------+  |     
>>   |
>>      >      >         +--------+-------+  |
>>      >      >          >>>              |  |VNI1 VNI2  VNI1 |  |     
>>   |  |
>>      >     VNI1 VNI2
>>      >      >         VNI1 |  |
>>      >      >          >>>              |  +-+-----+----+---+  |     
>>   |
>>      >      >         +-+-----+-----+--+  |
>>      >      >          >>>              |VAP1| VAP2|    | VAP3 |     
>>       |VAP1|
>>      >     VAP2|
>>      >      >           | VAP3|
>>      >      >          >>>              +----+-----+----+------+
>>      >      >           +----+-----+-----+-----+
>>      >      >          >>>                   |     |    |            
>>            |
>>      >         |     |
>>      >      >          >>>                   |     |    |            
>>            |
>>      >         |     |
>>      >      >          >>>                   |     |    |            
>>            |
>>      >         |     |
>>      >      >          >>>
>>      >      >             
>> -------+-----+----+-------------------+-----+-----+-------
>>      >      >          >>>                   |     |    |     Tenant 
>>            |
>>      >         |     |
>>      >      >          >>>              TSI1 | TSI2|    | TSI3       
>>       TSI1|
>>      >     TSI2|
>>      >      >           |TSI3
>>      >      >          >>>                  +---+ +---+ +---+        
>>          +---+
>>      >     +---+
>>      >      >           +---+
>>      >      >          >>>                  |TS1| |TS2| |TS3|        
>>          |TS4|
>>      >     |TS5|
>>      >      >           |TS6|
>>      >      >          >>>                  +---+ +---+ +---+        
>>          +---+
>>      >     +---+
>>      >      >           +---+
>>      >      >          >>>
>>      >      >          >>> To my understanding, the BFD sessions 
>> between
>>     NVE1
>>      >     and NVE2
>>      >      >         are actually
>>      >      >          >>> initiated and terminated at VAP of NVE.
>>      >      >          >>>
>>      >      >          >>> If the network operator want to set up one
>>     BFD session
>>      >      >         between VAP1 of
>>      >      >          >>> NVE1 and VAP1of NVE2, at the same time
>>     another BFD
>>      >     session
>>      >      >         between VAP3 of
>>      >      >          >>> NVE1 and VAP3 of NVE2, although the two 
>> BFD
>>     sessions are
>>      >      >         for the same
>>      >      >          >>> VNI1, I believe it's reasonable, so 
>> that's why I
>>      >     think we
>>      >      >         should allow it
>>      >      >
>>      >      >         _______________________________________________
>>      >      >         nvo3 mailing list
>>      >      > nvo3@ietf.org  
>> >     > > 
>>      >     >>
>>      >      > https://www.ietf.org/mailman/listinfo/nvo3
>>      >      >
>>      >
>> 

--=-xJzZpfWt/2dbFpwpkoOO
Content-Type: text/html; charset=us-ascii


oel,

I'm a tad frustrated that we're rehashing this discussions all over again. I specifically explained all the questions that were raised at that time. Let me try one last time.

1. BFD for VTEP is only useful for testing VXLAN plumbing, not the underlay itself.
2. So, the question is what do we use for VNI and the inner header?
3. The inner header is an IP packet because it is BFD. The IP address and the corresponding MAC address used MUST be one that is owned by the VTEP in the VNI that is used in the packet

This is sufficient to come up with an implementation that only ever tests one VNI or multiple VNIs between thr same pair of VTEPs. It is upto the users to decide what VNI, inner MAC and IP to use. The only restriction is that the VTEP must own those addresses to (i) prevent the packet from leaking to tenants and (ii) allow the tenants thems
 elves to be running BFD.

If implementations want to use VNI 1 as the recommended default VNI to use, that is fine. But if implementations want to pick more than 1 because they have a need to do so (I've seen operators do this because of their specific use case), then they can as long as they satisfy point 3, the draft is done. Why does there need to be any more discussion? The draft does need to spell out that using more than VNI has scaling issues that the user needs to be aware of, and it does.

Dinesh

On Wed, Oct 23, 2019 at 1:28 AM, Joel Halpern Direct <jmh.direct@joelhalpern.com> wrote:
That is input to the calculation at the VTEP.  It is NOT information sued by the network between the VTEPs.

As such, the VTEPs can emulate that by adjusting the source ports that it uses for the VFD packets.  The network does not need the VNI to actually be varied to achieve this purpose.

Yours,
Joel

On 10/22/2019 3:55 PM, Greg Mirsky wrote:

Hi Joel,
RFC 7348 suggests using information from the inner packet to calculate the value to be used in the Source UDP port number:
       -  Source Port:  It is recommended that the UDP source port number
          be calculated using a hash of fields from the inner packet --
          one example being a hash of the inner Ethernet frame's headers.
          This is to enable a level of entropy for the ECMP/load-
          balancing of the VM-to-VM traffic across the VXLAN overlay.
 From that text, I assume that VNI may be used as input for hashing function. If BFD over VXLAN doesn't support per VNI BFD session, then it cannot monitor multiple paths in underlay used to balance VM-to-VM traffic between the same pair of VTEPs. In my opinion, this is perfectly fine if that is WG's agreement. I'm glad we are discussing this and will have a conclusion.

Regards,
Greg

On Tue, Oct 22, 2019 at 3:30 PM Joel M. Halpern <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> wrote:

    As I recall, the VNI is not in the same place nor the same size as the
    TCP / UDP ports.  So it seems very unlikely that it would be used in
    ECMP.  In fact, avoiding that is why VXLAN does interesting things with
    the source UDP port.  Which the BFD can do.  And presumably MUST do if
    it was path matching.

    Yours,
    Joel

    On 10/22/2019 3:16 PM, Greg Mirsky wrote:
     > Hi Joel,
     > if the underlay may balance VXLAN between two VTEPs using VNI in
     > addition to other fields, then Option 2 has a certain value in my
    opinion.
     >
     > Regards,
     > Greg
     >
     > On Tue, Oct 22, 2019 at 3:06 PM Joel M. Halpern
    <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
     > <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>> wrote:
     >
     >     I do not understand the value of option 2.
     >     Which is why I asked in my initial review to move to option 1.
     >
     >     And option 2 requires stealing MAC addresses from the users,
    which
     >     seems
     >     to me to be a very bad thing that option 1 avoids.
     >
     >     Yours,
     >     Joel
     >
     >     On 10/22/2019 2:17 PM, Greg Mirsky wrote:
     >      > Hi Anoop, et al.,
     >      > I agree with your understanding of what is being defined
    in the
     >     current
     >      > version of the BFD over VxLAN specification. But, as I
     >     understand, the
     >      > WG is discussing the scope before the WGLC is closed. I
    believe
     >     there
     >      > are three options:
     >      >
     >      >  1. single BFD session between two VTEPs
     >      >  2. single BFD session per VNI between two VTEPs
     >      >  3. multiple BFD sessions per VNI between two VTEPs
     >      >
     >      > The current text reflects #2. Is WG accepts this scope? If
    not,
     >     which
     >      > option WG would accept?
     >      >
     >      > Regards,
     >      > Greg
     >      >
     >      > On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani
     >     <anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>
    <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>
     >      > <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>>>> wrote:
     >      >
     >      >     I concur with Joel's assessment with the following
     >     clarifications.
     >      >
     >      >     The current document is already capable of monitoring
     >     multiple VNIs
     >      >     between VTEPs.
     >      >
     >      >     The issue under discussion was how do we use BFD to
    monitor
     >     multiple
     >      >     VAPs that use the same VNI between a pair of VTEPs.     The use case
     >      >     for this is not clear to me, as from my understanding,
    we cannot
     >      >     have a situation with multiple VAPs using the same
    VNI--there
     >     is 1:1
     >      >     mapping between VAP and VNI.
     >      >
     >      >     Anoop
     >      >
     >      >     On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern
     >     <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>
     >      >     <mailto:jmh@joelhalpern.com
    <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com
    <mailto:jmh@joelhalpern.com>>>> wrote:
     >      >
     >      >           From what I can tell, there are two separate
    problems.
     >      >         The document we have is a VTEP-VTEP monitoring
    document.
     >     There
     >      >         is no
     >      >         need for that document to handle the multiple VNI
    case.
     >      >         If folks want a protocol for doing BFD monitoring
    of things
     >      >         behind the
     >      >         VTEPs (multiple VNIs), then do that as a separate
     >     document.   The
     >      >         encoding will be a tenant encoding, and thus sesparate
     >     from what is
     >      >         defined in this document.
     >      >
     >      >         Yours,
     >      >         Joel
     >      >
     >      >         On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
     >      >          > Santosh and others,
     >      >          >
     >      >          > On Thu, Oct 03, 2019 at 07:50:20PM +0530,
    Santosh P K
     >     wrote:
     >      >          >>     Thanks for your explanation. This helps a
    lot. I
     >     would
     >      >         wait for more
     >      >          >> comments from others to see if this what we
    need in this
     >      >         draft to be
     >      >          >> supported based on that we can provide appropriate
     >     sections
     >      >         in the draft.
     >      >          >
     >      >          > The threads on the list have spidered to the point
     >     where it
     >      >         is challenging
     >      >          > to follow what the current status of the draft
    is, or
     >     should
     >      >         be.  :-)
     >      >          >
     >      >          > However, if I've followed things properly, the
     >     question below
     >      >         is really the
     >      >          > hinge point on what our encapsulation for BFD
    over vxlan
     >      >         should look like.
     >      >          > Correct?
     >      >          >
     >      >          > Essentially, do we or do we not require the
    ability to
     >     permit
     >      >         multiple BFD
     >      >          > sessions between distinct VAPs?
     >      >          >
     >      >          > If this is so, do we have a sense as to how we
    should
     >     proceed?
     >      >          >
     >      >          > -- Jeff
     >      >          >
     >      >          > [context preserved below...]
     >      >          >
     >      >          >> Santosh P K
     >      >          >>
     >      >          >> On Wed, Sep 25, 2019 at 8:10 AM
    <xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>
     >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>
     >      >         <mailto:xiao.min2@zte.com.cn
    <mailto:xiao.min2@zte.com.cn>
     >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>>>
    wrote:
     >      >          >>
     >      >          >>> Hi Santosh,
     >      >          >>>
     >      >          >>>
     >      >          >>> With regard to the question whether we should
    allow
     >      >         multiple BFD sessions
     >      >          >>> for the same VNI or not, IMHO we should allow
    it, more
     >      >         explanation as
     >      >          >>> follows.
     >      >          >>>
     >      >          >>> Below is a figure derived from figure 2 of
    RFC8014 (An
     >      >         Architecture for
     >      >          >>> Data-Center Network Virtualization over Layer
    3 (NVO3)).
     >      >          >>>
     >      >          >>>                      |         Data Center
    Network (IP)
     >      >              |
     >      >          >>>                      |
     >      >             |
     >      >          >>>
     >      >         +-----------------------------------------+
     >      >          >>>                           |                               |
     >      >          >>>                           |       Tunnel
    Overlay      |
     >      >          >>>              +------------+---------+
     >      >           +---------+------------+
     >      >          >>>              | +----------+-------+ |       |
     >      >         +-------+----------+ |
     >      >          >>>              | |  Overlay Module  | |       |
    |  Overlay
     >      >         Module  | |
     >      >          >>>              | +---------+--------+ |       |
     >      >         +---------+--------+ |
     >      >          >>>              |           |          |       |
     >         |
     >      >                  |
     >      >          >>>       NVE1   |           |          |       |
     >         |
     >      >                  | NVE2
     >      >          >>>              |  +--------+-------+  |       |
     >      >         +--------+-------+  |
     >      >          >>>              |  |VNI1 VNI2  VNI1 |  |       |  |
     >     VNI1 VNI2
     >      >         VNI1 |  |
     >      >          >>>              |  +-+-----+----+---+  |       |
     >      >         +-+-----+-----+--+  |
     >      >          >>>              |VAP1| VAP2|    | VAP3 |           |VAP1|
     >     VAP2|
     >      >           | VAP3|
     >      >          >>>              +----+-----+----+------+
     >      >           +----+-----+-----+-----+
     >      >          >>>                   |     |    |                       |
     >         |     |
     >      >          >>>                   |     |    |                       |
     >         |     |
     >      >          >>>                   |     |    |                       |
     >         |     |
     >      >          >>>
     >      >             -------+-----+----+-------------------+-----+-----+-------
     >      >          >>>                   |     |    |     Tenant            |
     >         |     |
     >      >          >>>              TSI1 | TSI2|    | TSI3             TSI1|
     >     TSI2|
     >      >           |TSI3
     >      >          >>>                  +---+ +---+ +---+                 +---+
     >     +---+
     >      >           +---+
     >      >          >>>                  |TS1| |TS2| |TS3|                 |TS4|
     >     |TS5|
     >      >           |TS6|
     >      >          >>>                  +---+ +---+ +---+                 +---+
     >     +---+
     >      >           +---+
     >      >          >>>
     >      >          >>> To my understanding, the BFD sessions between
    NVE1
     >     and NVE2
     >      >         are actually
     >      >          >>> initiated and terminated at VAP of NVE.
     >      >          >>>
     >      >          >>> If the network operator want to set up one
    BFD session
     >      >         between VAP1 of
     >      >          >>> NVE1 and VAP1of NVE2, at the same time
    another BFD
     >     session
     >      >         between VAP3 of
     >      >          >>> NVE1 and VAP3 of NVE2, although the two BFD
    sessions are
     >      >         for the same
     >      >          >>> VNI1, I believe it's reasonable, so that's why I
     >     think we
     >      >         should allow it
     >      >
     >      >         _______________________________________________
     >      >         nvo3 mailing list
     >      > nvo3@ietf.org <mailto:nvo3@ietf.org> <mailto:nvo3@ietf.org
    <mailto:nvo3@ietf.org>> <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>
     >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>>
     >      > https://www.ietf.org/mailman/listinfo/nvo3
     >      >
     >



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Date: Wed, 23 Oct 2019 01:20:00 +0500
From: Dinesh Dutt 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Joel Halpern Direct 
Cc: Greg Mirsky , Anoop Ghanwani , Jeffrey Haas , Santosh P K , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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Oops, sorry for misspelling your name Joel,

Dinesh

On Wed, Oct 23, 2019 at 1:47 AM, Dinesh Dutt  wrote:
> oel,
> 
> I'm a tad frustrated that we're rehashing this discussions all over 
> again. I specifically explained all the questions that were raised at 
> that time. Let me try one last time.
> 
> 1. BFD for VTEP is only useful for testing VXLAN plumbing, not the 
> underlay itself.
> 2. So, the question is what do we use for VNI and the inner header?
> 3. The inner header is an IP packet because it is BFD. The IP address 
> and the corresponding MAC address used MUST be one that is owned by 
> the VTEP in the VNI that is used in the packet
> 
> This is sufficient to come up with an implementation that only ever 
> tests one VNI or multiple VNIs between thr same pair of VTEPs. It is 
> upto the users to decide what VNI, inner MAC and IP to use. The only 
> restriction is that the VTEP must own those addresses to (i) prevent 
> the packet from leaking to tenants and (ii) allow the tenants 
> themselves to be running BFD.
> 
> If implementations want to use VNI 1 as the recommended default VNI 
> to use, that is fine. But if implementations want to pick more than 1 
> because they have a need to do so (I've seen operators do this 
> because of their specific use case), then they can as long as they 
> satisfy point 3, the draft is done. Why does there need to be any 
> more discussion? The draft does need to spell out that using more 
> than VNI has scaling issues that the user needs to be aware of, and 
> it does.
> 
> Dinesh
> 
> On Wed, Oct 23, 2019 at 1:28 AM, Joel Halpern Direct 
>  wrote:
>> That is input to the calculation at the VTEP.  It is NOT information 
>> sued by the network between the VTEPs.
>> 
>> As such, the VTEPs can emulate that by adjusting the source ports 
>> that it uses for the VFD packets.  The network does not need the VNI 
>> to actually be varied to achieve this purpose.
>> 
>> Yours,
>> Joel
>> 
>> On 10/22/2019 3:55 PM, Greg Mirsky wrote:
>>> Hi Joel,
>>> RFC 7348 suggests using information from the inner packet to 
>>> calculate the value to be used in the Source UDP port number:
>>>        -  Source Port:  It is recommended that the UDP source port 
>>> number
>>>           be calculated using a hash of fields from the inner 
>>> packet --
>>>           one example being a hash of the inner Ethernet frame's 
>>> headers.
>>>           This is to enable a level of entropy for the ECMP/load-
>>>           balancing of the VM-to-VM traffic across the VXLAN 
>>> overlay.
>>>  From that text, I assume that VNI may be used as input for hashing 
>>> function. If BFD over VXLAN doesn't support per VNI BFD session, 
>>> then it cannot monitor multiple paths in underlay used to balance 
>>> VM-to-VM traffic between the same pair of VTEPs. In my opinion, 
>>> this is perfectly fine if that is WG's agreement. I'm glad we are 
>>> discussing this and will have a conclusion.
>>> 
>>> Regards,
>>> Greg
>>> 
>>> On Tue, Oct 22, 2019 at 3:30 PM Joel M. Halpern 
>>> > wrote:
>>> 
>>>     As I recall, the VNI is not in the same place nor the same size 
>>> as the
>>>     TCP / UDP ports.  So it seems very unlikely that it would be 
>>> used in
>>>     ECMP.  In fact, avoiding that is why VXLAN does interesting 
>>> things with
>>>     the source UDP port.  Which the BFD can do.  And presumably 
>>> MUST do if
>>>     it was path matching.
>>> 
>>>     Yours,
>>>     Joel
>>> 
>>>     On 10/22/2019 3:16 PM, Greg Mirsky wrote:
>>>      > Hi Joel,
>>>      > if the underlay may balance VXLAN between two VTEPs using 
>>> VNI in
>>>      > addition to other fields, then Option 2 has a certain value 
>>> in my
>>>     opinion.
>>>      >
>>>      > Regards,
>>>      > Greg
>>>      >
>>>      > On Tue, Oct 22, 2019 at 3:06 PM Joel M. Halpern
>>>     
>>>      > >> 
>>> wrote:
>>>      >
>>>      >     I do not understand the value of option 2.
>>>      >     Which is why I asked in my initial review to move to 
>>> option 1.
>>>      >
>>>      >     And option 2 requires stealing MAC addresses from the 
>>> users,
>>>     which
>>>      >     seems
>>>      >     to me to be a very bad thing that option 1 avoids.
>>>      >
>>>      >     Yours,
>>>      >     Joel
>>>      >
>>>      >     On 10/22/2019 2:17 PM, Greg Mirsky wrote:
>>>      >      > Hi Anoop, et al.,
>>>      >      > I agree with your understanding of what is being 
>>> defined
>>>     in the
>>>      >     current
>>>      >      > version of the BFD over VxLAN specification. But, as I
>>>      >     understand, the
>>>      >      > WG is discussing the scope before the WGLC is closed. 
>>> I
>>>     believe
>>>      >     there
>>>      >      > are three options:
>>>      >      >
>>>      >      >  1. single BFD session between two VTEPs
>>>      >      >  2. single BFD session per VNI between two VTEPs
>>>      >      >  3. multiple BFD sessions per VNI between two VTEPs
>>>      >      >
>>>      >      > The current text reflects #2. Is WG accepts this 
>>> scope? If
>>>     not,
>>>      >     which
>>>      >      > option WG would accept?
>>>      >      >
>>>      >      > Regards,
>>>      >      > Greg
>>>      >      >
>>>      >      > On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani
>>>      >     
>>>     >
>>>      >      > >>      >>     >>> wrote:
>>>      >      >
>>>      >      >     I concur with Joel's assessment with the following
>>>      >     clarifications.
>>>      >      >
>>>      >      >     The current document is already capable of 
>>> monitoring
>>>      >     multiple VNIs
>>>      >      >     between VTEPs.
>>>      >      >
>>>      >      >     The issue under discussion was how do we use BFD 
>>> to
>>>     monitor
>>>      >     multiple
>>>      >      >     VAPs that use the same VNI between a pair of 
>>> VTEPs.     The use case
>>>      >      >     for this is not clear to me, as from my 
>>> understanding,
>>>     we cannot
>>>      >      >     have a situation with multiple VAPs using the same
>>>     VNI--there
>>>      >     is 1:1
>>>      >      >     mapping between VAP and VNI.
>>>      >      >
>>>      >      >     Anoop
>>>      >      >
>>>      >      >     On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern
>>>      >     
>>>     >
>>>      >      >     >>      >>     >>> wrote:
>>>      >      >
>>>      >      >           From what I can tell, there are two separate
>>>     problems.
>>>      >      >         The document we have is a VTEP-VTEP monitoring
>>>     document.
>>>      >     There
>>>      >      >         is no
>>>      >      >         need for that document to handle the multiple 
>>> VNI
>>>     case.
>>>      >      >         If folks want a protocol for doing BFD 
>>> monitoring
>>>     of things
>>>      >      >         behind the
>>>      >      >         VTEPs (multiple VNIs), then do that as a 
>>> separate
>>>      >     document.   The
>>>      >      >         encoding will be a tenant encoding, and thus 
>>> sesparate
>>>      >     from what is
>>>      >      >         defined in this document.
>>>      >      >
>>>      >      >         Yours,
>>>      >      >         Joel
>>>      >      >
>>>      >      >         On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>      >      >          > Santosh and others,
>>>      >      >          >
>>>      >      >          > On Thu, Oct 03, 2019 at 07:50:20PM +0530,
>>>     Santosh P K
>>>      >     wrote:
>>>      >      >          >>     Thanks for your explanation. This 
>>> helps a
>>>     lot. I
>>>      >     would
>>>      >      >         wait for more
>>>      >      >          >> comments from others to see if this what 
>>> we
>>>     need in this
>>>      >      >         draft to be
>>>      >      >          >> supported based on that we can provide 
>>> appropriate
>>>      >     sections
>>>      >      >         in the draft.
>>>      >      >          >
>>>      >      >          > The threads on the list have spidered to 
>>> the point
>>>      >     where it
>>>      >      >         is challenging
>>>      >      >          > to follow what the current status of the 
>>> draft
>>>     is, or
>>>      >     should
>>>      >      >         be.  :-)
>>>      >      >          >
>>>      >      >          > However, if I've followed things properly, 
>>> the
>>>      >     question below
>>>      >      >         is really the
>>>      >      >          > hinge point on what our encapsulation for 
>>> BFD
>>>     over vxlan
>>>      >      >         should look like.
>>>      >      >          > Correct?
>>>      >      >          >
>>>      >      >          > Essentially, do we or do we not require the
>>>     ability to
>>>      >     permit
>>>      >      >         multiple BFD
>>>      >      >          > sessions between distinct VAPs?
>>>      >      >          >
>>>      >      >          > If this is so, do we have a sense as to 
>>> how we
>>>     should
>>>      >     proceed?
>>>      >      >          >
>>>      >      >          > -- Jeff
>>>      >      >          >
>>>      >      >          > [context preserved below...]
>>>      >      >          >
>>>      >      >          >> Santosh P K
>>>      >      >          >>
>>>      >      >          >> On Wed, Sep 25, 2019 at 8:10 AM
>>>     
>>>      >     >> >
>>>      >      >         >>     
>>>      >     >> >>>
>>>     wrote:
>>>      >      >          >>
>>>      >      >          >>> Hi Santosh,
>>>      >      >          >>>
>>>      >      >          >>>
>>>      >      >          >>> With regard to the question whether we 
>>> should
>>>     allow
>>>      >      >         multiple BFD sessions
>>>      >      >          >>> for the same VNI or not, IMHO we should 
>>> allow
>>>     it, more
>>>      >      >         explanation as
>>>      >      >          >>> follows.
>>>      >      >          >>>
>>>      >      >          >>> Below is a figure derived from figure 2 
>>> of
>>>     RFC8014 (An
>>>      >      >         Architecture for
>>>      >      >          >>> Data-Center Network Virtualization over 
>>> Layer
>>>     3 (NVO3)).
>>>      >      >          >>>
>>>      >      >          >>>                      |         Data 
>>> Center
>>>     Network (IP)
>>>      >      >              |
>>>      >      >          >>>                      |
>>>      >      >             |
>>>      >      >          >>>
>>>      >      >         +-----------------------------------------+
>>>      >      >          >>>                           |              
>>>                  |
>>>      >      >          >>>                           |       Tunnel
>>>     Overlay      |
>>>      >      >          >>>              +------------+---------+
>>>      >      >           +---------+------------+
>>>      >      >          >>>              | +----------+-------+ |    
>>>    |
>>>      >      >         +-------+----------+ |
>>>      >      >          >>>              | |  Overlay Module  | |    
>>>    |
>>>     |  Overlay
>>>      >      >         Module  | |
>>>      >      >          >>>              | +---------+--------+ |    
>>>    |
>>>      >      >         +---------+--------+ |
>>>      >      >          >>>              |           |          |    
>>>    |
>>>      >         |
>>>      >      >                  |
>>>      >      >          >>>       NVE1   |           |          |    
>>>    |
>>>      >         |
>>>      >      >                  | NVE2
>>>      >      >          >>>              |  +--------+-------+  |    
>>>    |
>>>      >      >         +--------+-------+  |
>>>      >      >          >>>              |  |VNI1 VNI2  VNI1 |  |    
>>>    |  |
>>>      >     VNI1 VNI2
>>>      >      >         VNI1 |  |
>>>      >      >          >>>              |  +-+-----+----+---+  |    
>>>    |
>>>      >      >         +-+-----+-----+--+  |
>>>      >      >          >>>              |VAP1| VAP2|    | VAP3 |    
>>>        |VAP1|
>>>      >     VAP2|
>>>      >      >           | VAP3|
>>>      >      >          >>>              +----+-----+----+------+
>>>      >      >           +----+-----+-----+-----+
>>>      >      >          >>>                   |     |    |           
>>>             |
>>>      >         |     |
>>>      >      >          >>>                   |     |    |           
>>>             |
>>>      >         |     |
>>>      >      >          >>>                   |     |    |           
>>>             |
>>>      >         |     |
>>>      >      >          >>>
>>>      >      >             
>>> -------+-----+----+-------------------+-----+-----+-------
>>>      >      >          >>>                   |     |    |     
>>> Tenant            |
>>>      >         |     |
>>>      >      >          >>>              TSI1 | TSI2|    | TSI3      
>>>        TSI1|
>>>      >     TSI2|
>>>      >      >           |TSI3
>>>      >      >          >>>                  +---+ +---+ +---+       
>>>           +---+
>>>      >     +---+
>>>      >      >           +---+
>>>      >      >          >>>                  |TS1| |TS2| |TS3|       
>>>           |TS4|
>>>      >     |TS5|
>>>      >      >           |TS6|
>>>      >      >          >>>                  +---+ +---+ +---+       
>>>           +---+
>>>      >     +---+
>>>      >      >           +---+
>>>      >      >          >>>
>>>      >      >          >>> To my understanding, the BFD sessions 
>>> between
>>>     NVE1
>>>      >     and NVE2
>>>      >      >         are actually
>>>      >      >          >>> initiated and terminated at VAP of NVE.
>>>      >      >          >>>
>>>      >      >          >>> If the network operator want to set up 
>>> one
>>>     BFD session
>>>      >      >         between VAP1 of
>>>      >      >          >>> NVE1 and VAP1of NVE2, at the same time
>>>     another BFD
>>>      >     session
>>>      >      >         between VAP3 of
>>>      >      >          >>> NVE1 and VAP3 of NVE2, although the two 
>>> BFD
>>>     sessions are
>>>      >      >         for the same
>>>      >      >          >>> VNI1, I believe it's reasonable, so 
>>> that's why I
>>>      >     think we
>>>      >      >         should allow it
>>>      >      >
>>>      >      >         
>>> _______________________________________________
>>>      >      >         nvo3 mailing list
>>>      >      > nvo3@ietf.org  
>>> >>     > >> 
>>>      >     >>
>>>      >      > https://www.ietf.org/mailman/listinfo/nvo3
>>>      >      >
>>>      >
>>> 

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Oops, sorry for misspelling your name Joel,

Dinesh

On Wed, Oct 23, 2019 at 1:47 AM, Dinesh Dutt <didutt@gmail.com> wrote:
oel,

I'm a tad frustrated that we're rehashing this discussions all over again. I specifically explained all the questions that were raised at that time. Let me try one last time.

1. BFD for VTEP is only useful for testing VXLAN plumbing, not the underlay itself.
2. So, the question is what do we use for VNI and the inner header?
3. The inner header is an IP packet because it is BFD. The IP address and the corresponding MAC address used MUST be one that is owned by the VTEP in the VNI that is used in the packet

This is sufficient to come up with an implementation that only ever tests one
  VNI or multiple VNIs between thr same pair of VTEPs. It is upto the users to decide what VNI, inner MAC and IP to use. The only restriction is that the VTEP must own those addresses to (i) prevent the packet from leaking to tenants and (ii) allow the tenants themselves to be running BFD.

If implementations want to use VNI 1 as the recommended default VNI to use, that is fine. But if implementations want to pick more than 1 because they have a need to do so (I've seen operators do this because of their specific use case), then they can as long as they satisfy point 3, the draft is done. Why does there need to be any more discussion? The draft does need to spell out that using more than VNI has scaling issues that the user needs to be aware of, and it does.

Dinesh

On Wed, Oct 23, 2019 at 1:28 AM, Joel Halpern Direct <jmh.direct@joelhalpern.com> wrote:
That is input to the calculation at the VTEP.  It is NOT information sued by the network between the VTEPs.

As such, the VTEPs can emulate that by adjusting the source ports that it uses for the VFD packets.  The network does not need the VNI to actually be varied to achieve this purpose.

Yours,
Joel

On 10/22/2019 3:55 PM, Greg Mirsky wrote:

Hi Joel,
RFC 7348 suggests using information from the inner packet to calculate the value to be used in the Source UDP port number:
       -  Source Port:  It is recommended that the UDP source port number
          be calculated using a hash of fields from the inner packet --
          one example being a hash of the inner Ethernet frame's headers.
          This is to enable a level of entropy for the ECMP/load-
          balancing of the VM-to-VM traffic across the VXLAN overlay.
 From that text, I assume that VNI may be used as input for hashing function. If BFD over VXLAN doesn't support per VNI BFD session, then it cannot monitor multiple paths in underlay used to balance VM-to-VM traffic between the same pair of VTEPs. In my opinion, this is perfectly fine if that is WG's agreement. I'm glad we are discussing this and will have a conclusion.

Regards,
Greg

On Tue, Oct 22, 2019 at 3:30 PM Joel M. Halpern <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> wrote:

    As I recall, the VNI is not in the same place nor the same size as the
    TCP / UDP ports.  So it seems very unlikely that it would be used in
    ECMP.  In fact, avoiding that is why VXLAN does interesting things with
    the source UDP port.  Which the BFD can do.  And presumably MUST do if
    it was path matching.

    Yours,
    Joel

    On 10/22/2019 3:16 PM, Greg Mirsky wrote:
     > Hi Joel,
     > if the underlay may balance VXLAN between two VTEPs using VNI in
     > addition to other fields, then Option 2 has a certain value in my
    opinion.
     >
     > Regards,
     > Greg
     >
     > On Tue, Oct 22, 2019 at 3:06 PM Joel M. Halpern
    <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
     > <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>> wrote:
     >
     >     I do not understand the value of option 2.
     >     Which is why I asked in my initial review to move to option 1.
     >
     >     And option 2 requires stealing MAC addresses from the users,
    which
     >     seems
     >     to me to be a very bad thing that option 1 avoids.
     >
     >     Yours,
     >     Joel
     >
     >     On 10/22/2019 2:17 PM, Greg Mirsky wrote:
     >      > Hi Anoop, et al.,
     >      > I agree with your understanding of what is being defined
    in the
     >     current
     >      > version of the BFD over VxLAN specification. But, as I
     >     understand, the
     >      > WG is discussing the scope before the WGLC is closed. I
    believe
     >     there
     >      > are three options:
     >      >
     >      >  1. single BFD session between two VTEPs
     >      >  2. single BFD session per VNI between two VTEPs
     >      >  3. multiple BFD sessions per VNI between two VTEPs
     >      >
     >      > The current text reflects #2. Is WG accepts this scope? If
    not,
     >     which
     >      > option WG would accept?
     >      >
     >      > Regards,
     >      > Greg
     >      >
     >      > On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani
     >     <anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>
    <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>
     >      > <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>>>> wrote:
     >      >
     >      >     I concur with Joel's assessment with the following
     >     clarifications.
     >      >
     >      >     The current document is already capable of monitoring
     >     multiple VNIs
     >      >     between VTEPs.
     >      >
     >      >     The issue under discussion was how do we use BFD to
    monitor
     >     multiple
     >      >     VAPs that use the same VNI between a pair of VTEPs.     The use case
     >      >     for this is not clear to me, as from my understanding,
    we cannot
     >      >     have a situation with multiple VAPs using the same
    VNI--there
     >     is 1:1
     >      >     mapping between VAP and VNI.
     >      >
     >      >     Anoop
     >      >
     >      >     On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern
     >     <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>
     >      >     <mailto:jmh@joelhalpern.com
    <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com
    <mailto:jmh@joelhalpern.com>>>> wrote:
     >      >
     >      >           From what I can tell, there are two separate
    problems.
     >      >         The document we have is a VTEP-VTEP monitoring
    document.
     >     There
     >      >         is no
     >      >         need for that document to handle the multiple VNI
    case.
     >      >         If folks want a protocol for doing BFD monitoring
    of things
     >      >         behind the
     >      >         VTEPs (multiple VNIs), then do that as a separate
     >     document.   The
     >      >         encoding will be a tenant encoding, and thus sesparate
     >     from what is
     >      >         defined in this document.
     >      >
     >      >         Yours,
     >      >         Joel
     >      >
     >      >         On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
     >      >          > Santosh and others,
     >      >          >
     >      >          > On Thu, Oct 03, 2019 at 07:50:20PM +0530,
    Santosh P K
     >     wrote:
     >      >          >>     Thanks for your explanation. This helps a
    lot. I
     >     would
     >      >         wait for more
     >      >          >> comments from others to see if this what we
    need in this
     >      >         draft to be
     >      >          >> supported based on that we can provide appropriate
     >     sections
     >      >         in the draft.
     >      >          >
     >      >          > The threads on the list have spidered to the point
     >     where it
     >      >         is challenging
     >      >          > to follow what the current status of the draft
    is, or
     >     should
     >      >         be.  :-)
     >      >          >
     >      >          > However, if I've followed things properly, the
     >     question below
     >      >         is really the
     >      >          > hinge point on what our encapsulation for BFD
    over vxlan
     >      >         should look like.
     >      >          > Correct?
     >      >          >
     >      >          > Essentially, do we or do we not require the
    ability to
     >     permit
     >      >         multiple BFD
     >      >          > sessions between distinct VAPs?
     >      >          >
     >      >          > If this is so, do we have a sense as to how we
    should
     >     proceed?
     >      >          >
     >      >          > -- Jeff
     >      >          >
     >      >          > [context preserved below...]
     >      >          >
     >      >          >> Santosh P K
     >      >          >>
     >      >          >> On Wed, Sep 25, 2019 at 8:10 AM
    <xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>
     >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>
     >      >         <mailto:xiao.min2@zte.com.cn
    <mailto:xiao.min2@zte.com.cn>
     >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>>>
    wrote:
     >      >          >>
     >      >          >>> Hi Santosh,
     >      >          >>>
     >      >          >>>
     >      >          >>> With regard to the question whether we should
    allow
     >      >         multiple BFD sessions
     >      >          >>> for the same VNI or not, IMHO we should allow
    it, more
     >      >         explanation as
     >      >          >>> follows.
     >      >          >>>
     >      >          >>> Below is a figure derived from figure 2 of
    RFC8014 (An
     >      >         Architecture for
     >      >          >>> Data-Center Network Virtualization over Layer
    3 (NVO3)).
     >      >          >>>
     >      >          >>>                      |         Data Center
    Network (IP)
     >      >              |
     >      >          >>>                      |
     >      >             |
     >      >          >>>
     >      >         +-----------------------------------------+
     >      >          >>>                           |                               |
     >      >          >>>                           |       Tunnel
    Overlay      |
     >      >          >>>              +------------+---------+
     >      >           +---------+------------+
     >      >          >>>              | +----------+-------+ |       |
     >      >         +-------+----------+ |
     >      >          >>>              | |  Overlay Module  | |       |
    |  Overlay
     >      >         Module  | |
     >      >          >>>              | +---------+--------+ |       |
     >      >         +---------+--------+ |
     >      >          >>>              |           |          |       |
     >         |
     >      >                  |
     >      >          >>>       NVE1   |           |          |       |
     >         |
     >      >                  | NVE2
     >      >          >>>              |  +--------+-------+  |       |
     >      >         +--------+-------+  |
     >      >          >>>              |  |VNI1 VNI2  VNI1 |  |       |  |
     >     VNI1 VNI2
     >      >         VNI1 |  |
     >      >          >>>              |  +-+-----+----+---+  |       |
     >      >         +-+-----+-----+--+  |
     >      >          >>>              |VAP1| VAP2|    | VAP3 |           |VAP1|
     >     VAP2|
     >      >           | VAP3|
     >      >          >>>              +----+-----+----+------+
     >      >           +----+-----+-----+-----+
     >      >          >>>                   |     |    |                       |
     >         |     |
     >      >          >>>                   |     |    |                       |
     >         |     |
     >      >          >>>                   |     |    |                       |
     >         |     |
     >      >          >>>
     >      >             -------+-----+----+-------------------+-----+-----+-------
     >      >          >>>                   |     |    |     Tenant            |
     >         |     |
     >      >          >>>              TSI1 | TSI2|    | TSI3             TSI1|
     >     TSI2|
     >      >           |TSI3
     >      >          >>>                  +---+ +---+ +---+                 +---+
     >     +---+
     >      >           +---+
     >      >          >>>                  |TS1| |TS2| |TS3|                 |TS4|
     >     |TS5|
     >      >           |TS6|
     >      >          >>>                  +---+ +---+ +---+                 +---+
     >     +---+
     >      >           +---+
     >      >          >>>
     >      >          >>> To my understanding, the BFD sessions between
    NVE1
     >     and NVE2
     >      >         are actually
     >      >          >>> initiated and terminated at VAP of NVE.
     >      >          >>>
     >      >          >>> If the network operator want to set up one
    BFD session
     >      >         between VAP1 of
     >      >          >>> NVE1 and VAP1of NVE2, at the same time
    another BFD
     >     session
     >      >         between VAP3 of
     >      >          >>> NVE1 and VAP3 of NVE2, although the two BFD
    sessions are
     >      >         for the same
     >      >          >>> VNI1, I believe it's reasonable, so that's why I
     >     think we
     >      >         should allow it
     >      >
     >      >         _______________________________________________
     >      >         nvo3 mailing list
     >      > nvo3@ietf.org <mailto:nvo3@ietf.org> <mailto:nvo3@ietf.org
    <mailto:nvo3@ietf.org>> <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>
     >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>>
     >      > https://www.ietf.org/mailman/listinfo/nvo3
     >      >
     >



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Date: Wed, 23 Oct 2019 06:52:22 +0500
From: Dinesh Dutt 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani 
Cc: Greg Mirsky , "Joel M. Halpern" , Jeffrey Haas , Santosh P K , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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I have the same feeling as Anoop. Greg, can you please point me to the 
latest draft so that I can quickly glance through it to be doubly sure,

Dinesh

On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani  
wrote:
> Greg,
> 
> I think the draft is fine as is.
> 
> I discussion with Xiao Min was about #3 and I see that as unnecessary 
> until we have a draft that explains why that is needed in the context 
> of the NVO3 architecture.
> 
> Anoop
> 
> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky  
> wrote:
>> Hi Anoop, et al.,
>> I agree with your understanding of what is being defined in the 
>> current version of the BFD over VxLAN specification. But, as I 
>> understand, the WG is discussing the scope before the WGLC is 
>> closed. I believe there are three options:
>> single BFD session between two VTEPs
>> single BFD session per VNI between two VTEPs
>> multiple BFD sessions per VNI between two VTEPs
>> The current text reflects #2. Is WG accepts this scope? If not, 
>> which option WG would accept?
>> 
>> Regards,
>> Greg
>> 
>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
>>  wrote:
>>> I concur with Joel's assessment with the following clarifications.
>>> 
>>> The current document is already capable of monitoring multiple VNIs 
>>> between VTEPs.
>>> 
>>> The issue under discussion was how do we use BFD to monitor 
>>> multiple VAPs that use the same VNI between a pair of VTEPs.  The 
>>> use case for this is not clear to me, as from my understanding, we 
>>> cannot have a situation with multiple VAPs using the same 
>>> VNI--there is 1:1 mapping between VAP and VNI.
>>> 
>>> Anoop
>>> 
>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>>>  wrote:
>>>>  From what I can tell, there are two separate problems.
>>>> The document we have is a VTEP-VTEP monitoring document.  There is 
>>>> no
>>>> need for that document to handle the multiple VNI case.
>>>> If folks want a protocol for doing BFD monitoring of things behind 
>>>> the
>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>> encoding will be a tenant encoding, and thus sesparate from what is
>>>> defined in this document.
>>>> 
>>>> Yours,
>>>> Joel
>>>> 
>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>> > Santosh and others,
>>>> >
>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>> >>     Thanks for your explanation. This helps a lot. I would wait 
>>>> for more
>>>> >> comments from others to see if this what we need in this draft 
>>>> to be
>>>> >> supported based on that we can provide appropriate sections in 
>>>> the draft.
>>>> >
>>>> > The threads on the list have spidered to the point where it is 
>>>> challenging
>>>> > to follow what the current status of the draft is, or should be. 
>>>>  :-)
>>>> >
>>>> > However, if I've followed things properly, the question below is 
>>>> really the
>>>> > hinge point on what our encapsulation for BFD over vxlan should 
>>>> look like.
>>>> > Correct?
>>>> >
>>>> > Essentially, do we or do we not require the ability to permit 
>>>> multiple BFD
>>>> > sessions between distinct VAPs?
>>>> >
>>>> > If this is so, do we have a sense as to how we should proceed?
>>>> >
>>>> > -- Jeff
>>>> >
>>>> > [context preserved below...]
>>>> >
>>>> >> Santosh P K
>>>> >>
>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>> >>
>>>> >>> Hi Santosh,
>>>> >>>
>>>> >>>
>>>> >>> With regard to the question whether we should allow multiple 
>>>> BFD sessions
>>>> >>> for the same VNI or not, IMHO we should allow it, more 
>>>> explanation as
>>>> >>> follows.
>>>> >>>
>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An 
>>>> Architecture for
>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>> >>>
>>>> >>>                      |         Data Center Network (IP)        
>>>> |
>>>> >>>                      |                                         
>>>> |
>>>> >>>                      
>>>> +-----------------------------------------+
>>>> >>>                           |                           |
>>>> >>>                           |       Tunnel Overlay      |
>>>> >>>              +------------+---------+       
>>>> +---------+------------+
>>>> >>>              | +----------+-------+ |       | 
>>>> +-------+----------+ |
>>>> >>>              | |  Overlay Module  | |       | |  Overlay 
>>>> Module  | |
>>>> >>>              | +---------+--------+ |       | 
>>>> +---------+--------+ |
>>>> >>>              |           |          |       |           |      
>>>>     |
>>>> >>>       NVE1   |           |          |       |           |      
>>>>     | NVE2
>>>> >>>              |  +--------+-------+  |       |  
>>>> +--------+-------+  |
>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 
>>>> VNI1 |  |
>>>> >>>              |  +-+-----+----+---+  |       |  
>>>> +-+-----+-----+--+  |
>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | 
>>>> VAP3|
>>>> >>>              +----+-----+----+------+       
>>>> +----+-----+-----+-----+
>>>> >>>                   |     |    |                   |     |     |
>>>> >>>                   |     |    |                   |     |     |
>>>> >>>                   |     |    |                   |     |     |
>>>> >>>            
>>>> -------+-----+----+-------------------+-----+-----+-------
>>>> >>>                   |     |    |     Tenant        |     |     |
>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     
>>>> |TSI3
>>>> >>>                  +---+ +---+ +---+             +---+ +---+   
>>>> +---+
>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   
>>>> |TS6|
>>>> >>>                  +---+ +---+ +---+             +---+ +---+   
>>>> +---+
>>>> >>>
>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 
>>>> are actually
>>>> >>> initiated and terminated at VAP of NVE.
>>>> >>>
>>>> >>> If the network operator want to set up one BFD session between 
>>>> VAP1 of
>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session 
>>>> between VAP3 of
>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for 
>>>> the same
>>>> >>> VNI1, I believe it's reasonable, so that's why I think we 
>>>> should allow it
>>>> 
>>>> _______________________________________________
>>>> nvo3 mailing list
>>>> nvo3@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/nvo3

--=-dagu79cbogutom+Tsa/l
Content-Type: text/html; charset=us-ascii


I have the same feeling as Anoop. Greg, can you please point me to the latest draft so that I can quickly glance through it to be doubly sure,

Dinesh

On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Greg,

I think the draft is fine as is.

I discussion with Xiao Min was about #3 and I see that as unnecessary until we have a draft that explains why that is needed in the context of the NVO3 architecture.

Anoop

On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop, et al.,
I agree with your understanding of what is being defined in the current version of the BFD over VxLAN specification. But, as I understand, the WG is discussing the scope before the WGLC is closed. I believe there are three options:
  1. single BFD session between two VTEPs
  2. single BFD session per VNI between two VTEPs
  3. multiple BFD sessions per VNI between two VTEPs
The current text reflects #2. Is WG accepts this scope? If not, which option WG would accept?

Regards,
Greg

On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
I concur with Joel's asses
 sment with the following clarifications.

The current document is already capable of monitoring multiple VNIs between VTEPs.

The issue under discussion was how do we use BFD to monitor multiple VAPs that use the same VNI between a pair of VTEPs.  The use case for this is not clear to me, as from my understanding, we cannot have a situation with multiple VAPs using the same VNI--there is 1:1 mapping between VAP and VNI.

Anoop

On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
 From what I can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.  There is no 

need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.   The 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>     Thanks for your explanation. This helps a lot. I would wait for more

>> comments from others to see if this what we need in this draft to be

>> supported based on that we can provide appropriate sections in the draft.

> 

> The threads on the list have spidered to the point where it is challenging

> to follow what the current status of the draft is, or should be.  :-)

> 

> However, if I've followed things properly, the question below is really the

> hinge point on what our encapsulation for BFD over vxlan should look like.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple BFD sessions

>>> for the same VNI or not, IMHO we should allow it, more explanation as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Architecture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>                      |         Data Center Network (IP)        |

>>>                      |                                         |

>>>                      +-----------------------------------------+

>>>                           |                           |

>>>                           |       Tunnel Overlay      |

>>>              +------------+---------+       +---------+------------+

>>>              | +----------+-------+ |       | +-------+----------+ |

>>>              | |  Overlay Module  | |       | |  Overlay Module  | |

>>>              | +---------+--------+ |       | +---------+--------+ |

>>>              |           |          |       |           |          |

>>>       NVE1   |           |          |       |           |          | NVE2

>>>              |  +--------+-------+  |       |  +--------+-------+  |

>>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |

>>>              |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |

>>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|

>>>              +----+-----+----+------+       +----+-----+-----+-----+

>>>                   |     |    |                   |     |     |

>>>                   |     |    |                   |     |     |

>>>                   |     |    |                   |     |     |

>>>            -------+-----+----+-------------------+-----+-----+-------

>>>                   |     |    |     Tenant        |     |     |

>>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3

>>>                  +---+ +---+ +---+             +---+ +---+   +---+

>>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|

>>>                  +---+ +---+ +---+             +---+ +---+   +---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 are actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session between VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same

>>> VNI1, I believe it's reasonable, so that's why I think we should allow it



_______________________________________________

nvo3 mailing list

nvo3@ietf.org

https://www.ietf.org/mailman/listinfo/nvo3








--=-dagu79cbogutom+Tsa/l--


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From: Anoop Ghanwani 
Date: Tue, 22 Oct 2019 16:05:32 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Greg Mirsky 
Cc: "Joel M. Halpern" , Jeffrey Haas ,  Santosh P K , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, Dinesh Dutt ,  rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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--000000000000047745059587d725
Content-Type: text/plain; charset="UTF-8"

Greg,

I think the draft is fine as is.

I discussion with Xiao Min was about #3 and I see that as unnecessary until
we have a draft that explains why that is needed in the context of the NVO3
architecture.

Anoop

On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky  wrote:

> Hi Anoop, et al.,
> I agree with your understanding of what is being defined in the current
> version of the BFD over VxLAN specification. But, as I understand, the WG
> is discussing the scope before the WGLC is closed. I believe there are
> three options:
>
>    1. single BFD session between two VTEPs
>    2. single BFD session per VNI between two VTEPs
>    3. multiple BFD sessions per VNI between two VTEPs
>
> The current text reflects #2. Is WG accepts this scope? If not, which
> option WG would accept?
>
> Regards,
> Greg
>
> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
> wrote:
>
>> I concur with Joel's assessment with the following clarifications.
>>
>> The current document is already capable of monitoring multiple VNIs
>> between VTEPs.
>>
>> The issue under discussion was how do we use BFD to monitor multiple VAPs
>> that use the same VNI between a pair of VTEPs.  The use case for this is
>> not clear to me, as from my understanding, we cannot have a situation with
>> multiple VAPs using the same VNI--there is 1:1 mapping between VAP and VNI.
>>
>> Anoop
>>
>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>> wrote:
>>
>>>  From what I can tell, there are two separate problems.
>>> The document we have is a VTEP-VTEP monitoring document.  There is no
>>> need for that document to handle the multiple VNI case.
>>> If folks want a protocol for doing BFD monitoring of things behind the
>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>> encoding will be a tenant encoding, and thus sesparate from what is
>>> defined in this document.
>>>
>>> Yours,
>>> Joel
>>>
>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>> > Santosh and others,
>>> >
>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>> >>     Thanks for your explanation. This helps a lot. I would wait for
>>> more
>>> >> comments from others to see if this what we need in this draft to be
>>> >> supported based on that we can provide appropriate sections in the
>>> draft.
>>> >
>>> > The threads on the list have spidered to the point where it is
>>> challenging
>>> > to follow what the current status of the draft is, or should be.  :-)
>>> >
>>> > However, if I've followed things properly, the question below is
>>> really the
>>> > hinge point on what our encapsulation for BFD over vxlan should look
>>> like.
>>> > Correct?
>>> >
>>> > Essentially, do we or do we not require the ability to permit multiple
>>> BFD
>>> > sessions between distinct VAPs?
>>> >
>>> > If this is so, do we have a sense as to how we should proceed?
>>> >
>>> > -- Jeff
>>> >
>>> > [context preserved below...]
>>> >
>>> >> Santosh P K
>>> >>
>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>> >>
>>> >>> Hi Santosh,
>>> >>>
>>> >>>
>>> >>> With regard to the question whether we should allow multiple BFD
>>> sessions
>>> >>> for the same VNI or not, IMHO we should allow it, more explanation as
>>> >>> follows.
>>> >>>
>>> >>> Below is a figure derived from figure 2 of RFC8014 (An Architecture
>>> for
>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>> >>>
>>> >>>                      |         Data Center Network (IP)        |
>>> >>>                      |                                         |
>>> >>>                      +-----------------------------------------+
>>> >>>                           |                           |
>>> >>>                           |       Tunnel Overlay      |
>>> >>>              +------------+---------+       +---------+------------+
>>> >>>              | +----------+-------+ |       | +-------+----------+ |
>>> >>>              | |  Overlay Module  | |       | |  Overlay Module  | |
>>> >>>              | +---------+--------+ |       | +---------+--------+ |
>>> >>>              |           |          |       |           |          |
>>> >>>       NVE1   |           |          |       |           |          |
>>> NVE2
>>> >>>              |  +--------+-------+  |       |  +--------+-------+  |
>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
>>> >>>              |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
>>> >>>              +----+-----+----+------+       +----+-----+-----+-----+
>>> >>>                   |     |    |                   |     |     |
>>> >>>                   |     |    |                   |     |     |
>>> >>>                   |     |    |                   |     |     |
>>> >>>            -------+-----+----+-------------------+-----+-----+-------
>>> >>>                   |     |    |     Tenant        |     |     |
>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>> >>>
>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>> actually
>>> >>> initiated and terminated at VAP of NVE.
>>> >>>
>>> >>> If the network operator want to set up one BFD session between VAP1
>>> of
>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session between
>>> VAP3 of
>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same
>>> >>> VNI1, I believe it's reasonable, so that's why I think we should
>>> allow it
>>>
>>> _______________________________________________
>>> nvo3 mailing list
>>> nvo3@ietf.org
>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>
>>

--000000000000047745059587d725
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Greg,

I think the draft is fine as is.<=
/div>

I discussion with Xiao Min was about #3 and I see =
that as unnecessary until we have a draft that explains why that is needed =
in the context of the NVO3 architecture.

Anoop

On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop, et al.,I agree with your understanding of what is being defined in the current v=
ersion of the BFD over VxLAN specification. But, as I understand, the WG is=
 discussing the scope before the WGLC is closed. I believe there are three =
options:
  1. single BFD session between two VTEPs
  2. sin=
gle BFD session per VNI between two VTEPs
  3. multiple BFD sessions per=
 VNI between two VTEPs
The current text reflects #2. Is WG ac=
cepts this scope? If not, which option WG would accept?
Regards,
Greg

On Tue, Oct 22, 2019 at 2:09 PM An=
oop Ghanwani <anoop@alumni.duke.edu> wrote:
I concur with Joel&=
#39;s assessment with the following clarifications.

The =
current document is already capable of monitoring multiple VNIs between VTE=
Ps.

The issue under discussion was how do we use B=
FD to monitor multiple VAPs that use the same VNI between a pair of VTEPs.=
=C2=A0 The use case for this is not clear to me, as from my understanding, =
we cannot have a situation with multiple VAPs using the same VNI--there is =
1:1 mapping between VAP and VNI.

Anoop
=

On Tue=
, Oct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
=C2=A0From what I can tell, =
there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



_______________________________________________

nvo3 mailing list

nvo3@ietf.org

https://www.ietf.org/mailman/listinfo/nvo3







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From: Greg Mirsky 
Date: Tue, 22 Oct 2019 22:28:19 -0400
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Dinesh Dutt 
Cc: Anoop Ghanwani , "Joel M. Halpern" ,  Jeffrey Haas , Santosh P K , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Dinesh,
I greatly appreciate your comments. Please heave a look at the attached
copy of the working version and its diff to -07 (latest in the datatracker).

Regards,
Greg

On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:

> I have the same feeling as Anoop. Greg, can you please point me to the
> latest draft so that I can quickly glance through it to be doubly sure,
>
> Dinesh
>
> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani 
> wrote:
>
> Greg,
>
> I think the draft is fine as is.
>
> I discussion with Xiao Min was about #3 and I see that as unnecessary
> until we have a draft that explains why that is needed in the context of
> the NVO3 architecture.
>
> Anoop
>
> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
> wrote:
>
>> Hi Anoop, et al.,
>> I agree with your understanding of what is being defined in the current
>> version of the BFD over VxLAN specification. But, as I understand, the WG
>> is discussing the scope before the WGLC is closed. I believe there are
>> three options:
>>
>>    1. single BFD session between two VTEPs
>>    2. single BFD session per VNI between two VTEPs
>>    3. multiple BFD sessions per VNI between two VTEPs
>>
>> The current text reflects #2. Is WG accepts this scope? If not, which
>> option WG would accept?
>>
>> Regards,
>> Greg
>>
>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
>> wrote:
>>
>>> I concur with Joel's assessment with the following clarifications.
>>>
>>> The current document is already capable of monitoring multiple VNIs
>>> between VTEPs.
>>>
>>> The issue under discussion was how do we use BFD to monitor multiple
>>> VAPs that use the same VNI between a pair of VTEPs.  The use case for this
>>> is not clear to me, as from my understanding, we cannot have a situation
>>> with multiple VAPs using the same VNI--there is 1:1 mapping between VAP and
>>> VNI.
>>>
>>> Anoop
>>>
>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>>> wrote:
>>>
>>>>  From what I can tell, there are two separate problems.
>>>> The document we have is a VTEP-VTEP monitoring document.  There is no
>>>> need for that document to handle the multiple VNI case.
>>>> If folks want a protocol for doing BFD monitoring of things behind the
>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>> encoding will be a tenant encoding, and thus sesparate from what is
>>>> defined in this document.
>>>>
>>>> Yours,
>>>> Joel
>>>>
>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>> > Santosh and others,
>>>> >
>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>> >>     Thanks for your explanation. This helps a lot. I would wait for
>>>> more
>>>> >> comments from others to see if this what we need in this draft to be
>>>> >> supported based on that we can provide appropriate sections in the
>>>> draft.
>>>> >
>>>> > The threads on the list have spidered to the point where it is
>>>> challenging
>>>> > to follow what the current status of the draft is, or should be.  :-)
>>>> >
>>>> > However, if I've followed things properly, the question below is
>>>> really the
>>>> > hinge point on what our encapsulation for BFD over vxlan should look
>>>> like.
>>>> > Correct?
>>>> >
>>>> > Essentially, do we or do we not require the ability to permit
>>>> multiple BFD
>>>> > sessions between distinct VAPs?
>>>> >
>>>> > If this is so, do we have a sense as to how we should proceed?
>>>> >
>>>> > -- Jeff
>>>> >
>>>> > [context preserved below...]
>>>> >
>>>> >> Santosh P K
>>>> >>
>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>> >>
>>>> >>> Hi Santosh,
>>>> >>>
>>>> >>>
>>>> >>> With regard to the question whether we should allow multiple BFD
>>>> sessions
>>>> >>> for the same VNI or not, IMHO we should allow it, more explanation
>>>> as
>>>> >>> follows.
>>>> >>>
>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An Architecture
>>>> for
>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>> >>>
>>>> >>>                      |         Data Center Network (IP)        |
>>>> >>>                      |                                         |
>>>> >>>                      +-----------------------------------------+
>>>> >>>                           |                           |
>>>> >>>                           |       Tunnel Overlay      |
>>>> >>>              +------------+---------+       +---------+------------+
>>>> >>>              | +----------+-------+ |       | +-------+----------+ |
>>>> >>>              | |  Overlay Module  | |       | |  Overlay Module  | |
>>>> >>>              | +---------+--------+ |       | +---------+--------+ |
>>>> >>>              |           |          |       |           |          |
>>>> >>>       NVE1   |           |          |       |           |
>>>> | NVE2
>>>> >>>              |  +--------+-------+  |       |  +--------+-------+  |
>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |
>>>> >>>              |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |
>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|
>>>> >>>              +----+-----+----+------+       +----+-----+-----+-----+
>>>> >>>                   |     |    |                   |     |     |
>>>> >>>                   |     |    |                   |     |     |
>>>> >>>                   |     |    |                   |     |     |
>>>> >>>
>>>> -------+-----+----+-------------------+-----+-----+-------
>>>> >>>                   |     |    |     Tenant        |     |     |
>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>> >>>
>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>> actually
>>>> >>> initiated and terminated at VAP of NVE.
>>>> >>>
>>>> >>> If the network operator want to set up one BFD session between VAP1
>>>> of
>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session between
>>>> VAP3 of
>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the
>>>> same
>>>> >>> VNI1, I believe it's reasonable, so that's why I think we should
>>>> allow it
>>>>
>>>> _______________________________________________
>>>> nvo3 mailing list
>>>> nvo3@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>
>>>

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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Dinesh,
I greatly appreciate your comments. Please =
heave a look at the attached copy of the working version and its diff to -0=
7 (latest in the datatracker).

Regards,
=
Greg

On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt <didutt@gmail.com> wrote:
I have the same feeling as Anoop. Greg, can yo=
u please point me to the latest draft so that I can quickly glance through =
it to be doubly sure,

Dinesh

On Wed, Oct 23, =
2019 at 4:35 AM, Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Greg,

I think the draft is f=
ine as is.

I discussion with Xiao Min was about #3=
 and I see that as unnecessary until we have a draft that explains why that=
 is needed in the context of the NVO3 architecture.

Anoop

On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com>=
 wrote:
Hi Anoop, et al.,
I agree with your understanding of what is b=
eing defined in the current version of the BFD over VxLAN specification. Bu=
t, as I understand, the WG is discussing the scope before the WGLC is close=
d. I believe there are three options:
  1. single BFD session =
between two VTEPs
  2. single BFD session per VNI between two VTEPs
    3. =

  3. multiple BFD sessions per VNI between two VTEPs
The curre=
nt text reflects #2. Is WG accepts this scope? If not, which option WG woul=
d accept?

Regards,
Greg

On Tu=
e, Oct 22, 2019 at 2:09 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
I concur with Joel's assessment with the following clarificat=
ions.

The current document is already capable of monitor=
ing multiple VNIs between VTEPs.

The issue under d=
iscussion was how do we use BFD to monitor multiple VAPs that use the same =
VNI between a pair of VTEPs.=C2=A0 The use case for this is not clear to me=
, as from my understanding, we cannot have a situation with multiple VAPs u=
sing the same VNI--there is 1:1 mapping between VAP and VNI.

=

Anoop

On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <<=
a href=3D"mailto:jmh@joelhalpern.com" target=3D"_blank">jmh@joelhalpern.com=
> wrote:
=
=C2=A0From what I can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



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Date: Wed, 23 Oct 2019 07:47:49 +0500
From: Dinesh Dutt 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Greg Mirsky 
Cc: Anoop Ghanwani , "Joel M. Halpern" , Jeffrey Haas , Santosh P K , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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Greg,

Two comments, one minor and one maybe not.

- In section 3, there's a sentence that is: "BFD packets intended for a 
Hypervisor VTEP MUST NOT..". I recommend getting rid of the word 
"Hypervisor" ashe logic applies to any VTEP.

- You already explained the precedence of the use of 127/8 address in 
the inner header in MPLS. I have no specific comments in that area. I 
have only two questions:
   - Has anybody verified that the use of 127/8 address (and the right 
MAC) works with existing implementations, including the silicon ones? 
If this doesn't work there, is it worth adding the possibilit y of 
another address, one that is owned by the VTEP node?
   - Do we know if Firewalls stop such VXLAN packets? I ask this 
because VXLAN has an IP header and I don't know if firewalls stop 
packets with 127/8 in the inner header. If not, is it worth adding a 
sentence to say that firewalls  allow such packets? The use of a 
non-127/8 address may alleviate this case as well.

The rest of the draft looks good to me,

Dinesh

On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky  
wrote:
> Hi Dinesh,
> I greatly appreciate your comments. Please heave a look at the 
> attached copy of the working version and its diff to -07 (latest in 
> the datatracker).
> 
> Regards,
> Greg
> 
> On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:
>> I have the same feeling as Anoop. Greg, can you please point me to 
>> the latest draft so that I can quickly glance through it to be 
>> doubly sure,
>> 
>> Dinesh
>> 
>> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani 
>>  wrote:
>>> Greg,
>>> 
>>> I think the draft is fine as is.
>>> 
>>> I discussion with Xiao Min was about #3 and I see that as 
>>> unnecessary until we have a draft that explains why that is needed 
>>> in the context of the NVO3 architecture.
>>> 
>>> Anoop
>>> 
>>> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
>>>  wrote:
>>>> Hi Anoop, et al.,
>>>> I agree with your understanding of what is being defined in the 
>>>> current version of the BFD over VxLAN specification. But, as I 
>>>> understand, the WG is discussing the scope before the WGLC is 
>>>> closed. I believe there are three options:
>>>> single BFD session between two VTEPs
>>>> single BFD session per VNI between two VTEPs
>>>> multiple BFD sessions per VNI between two VTEPs
>>>> The current text reflects #2. Is WG accepts this scope? If not, 
>>>> which option WG would accept?
>>>> 
>>>> Regards,
>>>> Greg
>>>> 
>>>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
>>>>  wrote:
>>>>> I concur with Joel's assessment with the following clarifications.
>>>>> 
>>>>> The current document is already capable of monitoring multiple 
>>>>> VNIs between VTEPs.
>>>>> 
>>>>> The issue under discussion was how do we use BFD to monitor 
>>>>> multiple VAPs that use the same VNI between a pair of VTEPs.  The 
>>>>> use case for this is not clear to me, as from my understanding, 
>>>>> we cannot have a situation with multiple VAPs using the same 
>>>>> VNI--there is 1:1 mapping between VAP and VNI.
>>>>> 
>>>>> Anoop
>>>>> 
>>>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>>>>>  wrote:
>>>>>>  From what I can tell, there are two separate problems.
>>>>>> The document we have is a VTEP-VTEP monitoring document.  There 
>>>>>> is no
>>>>>> need for that document to handle the multiple VNI case.
>>>>>> If folks want a protocol for doing BFD monitoring of things 
>>>>>> behind the
>>>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>>>> encoding will be a tenant encoding, and thus sesparate from what 
>>>>>> is
>>>>>> defined in this document.
>>>>>> 
>>>>>> Yours,
>>>>>> Joel
>>>>>> 
>>>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>>>> > Santosh and others,
>>>>>> >
>>>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>>>> >>     Thanks for your explanation. This helps a lot. I would 
>>>>>> wait for more
>>>>>> >> comments from others to see if this what we need in this 
>>>>>> draft to be
>>>>>> >> supported based on that we can provide appropriate sections 
>>>>>> in the draft.
>>>>>> >
>>>>>> > The threads on the list have spidered to the point where it is 
>>>>>> challenging
>>>>>> > to follow what the current status of the draft is, or should 
>>>>>> be.  :-)
>>>>>> >
>>>>>> > However, if I've followed things properly, the question below 
>>>>>> is really the
>>>>>> > hinge point on what our encapsulation for BFD over vxlan 
>>>>>> should look like.
>>>>>> > Correct?
>>>>>> >
>>>>>> > Essentially, do we or do we not require the ability to permit 
>>>>>> multiple BFD
>>>>>> > sessions between distinct VAPs?
>>>>>> >
>>>>>> > If this is so, do we have a sense as to how we should proceed?
>>>>>> >
>>>>>> > -- Jeff
>>>>>> >
>>>>>> > [context preserved below...]
>>>>>> >
>>>>>> >> Santosh P K
>>>>>> >>
>>>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>>>> >>
>>>>>> >>> Hi Santosh,
>>>>>> >>>
>>>>>> >>>
>>>>>> >>> With regard to the question whether we should allow multiple 
>>>>>> BFD sessions
>>>>>> >>> for the same VNI or not, IMHO we should allow it, more 
>>>>>> explanation as
>>>>>> >>> follows.
>>>>>> >>>
>>>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An 
>>>>>> Architecture for
>>>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>> >>>
>>>>>> >>>                      |         Data Center Network (IP)      
>>>>>>   |
>>>>>> >>>                      |                                       
>>>>>>   |
>>>>>> >>>                      
>>>>>> +-----------------------------------------+
>>>>>> >>>                           |                           |
>>>>>> >>>                           |       Tunnel Overlay      |
>>>>>> >>>              +------------+---------+       
>>>>>> +---------+------------+
>>>>>> >>>              | +----------+-------+ |       | 
>>>>>> +-------+----------+ |
>>>>>> >>>              | |  Overlay Module  | |       | |  Overlay 
>>>>>> Module  | |
>>>>>> >>>              | +---------+--------+ |       | 
>>>>>> +---------+--------+ |
>>>>>> >>>              |           |          |       |           |    
>>>>>>       |
>>>>>> >>>       NVE1   |           |          |       |           |    
>>>>>>       | NVE2
>>>>>> >>>              |  +--------+-------+  |       |  
>>>>>> +--------+-------+  |
>>>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 
>>>>>> VNI1 |  |
>>>>>> >>>              |  +-+-----+----+---+  |       |  
>>>>>> +-+-----+-----+--+  |
>>>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     
>>>>>> | VAP3|
>>>>>> >>>              +----+-----+----+------+       
>>>>>> +----+-----+-----+-----+
>>>>>> >>>                   |     |    |                   |     |     
>>>>>> |
>>>>>> >>>                   |     |    |                   |     |     
>>>>>> |
>>>>>> >>>                   |     |    |                   |     |     
>>>>>> |
>>>>>> >>>            
>>>>>> -------+-----+----+-------------------+-----+-----+-------
>>>>>> >>>                   |     |    |     Tenant        |     |     
>>>>>> |
>>>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     
>>>>>> |TSI3
>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+   
>>>>>> +---+
>>>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   
>>>>>> |TS6|
>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+   
>>>>>> +---+
>>>>>> >>>
>>>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 
>>>>>> are actually
>>>>>> >>> initiated and terminated at VAP of NVE.
>>>>>> >>>
>>>>>> >>> If the network operator want to set up one BFD session 
>>>>>> between VAP1 of
>>>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session 
>>>>>> between VAP3 of
>>>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for 
>>>>>> the same
>>>>>> >>> VNI1, I believe it's reasonable, so that's why I think we 
>>>>>> should allow it
>>>>>> 
>>>>>> _______________________________________________
>>>>>> nvo3 mailing list
>>>>>> nvo3@ietf.org
>>>>>> https://www.ietf.org/mailman/listinfo/nvo3

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Greg,

Two comments, one minor and one maybe not.

- In section 3, there's a sentence that is: "BFD packets intended for a Hypervisor VTEP MUST NOT..". I recommend getting rid of the word "Hypervisor" ashe logic applies to any VTEP.

- You already explained the precedence of the use of 127/8 address in the inner header in MPLS. I have no specific comments in that area. I have only two questions: 
   - Has anybody verified that the use of 127/8 address (and the right MAC) works with existing implementations, including the silicon ones? If this doesn't work there, is it worth adding the possibilit y of another address, one that is owned by the VTEP node?
   - Do we know if Firewalls stop such VXLAN packets? I ask this because VXLAN has an IP header and I don't know if firewalls stop packets with 127/8 in the inner header. If not, is i
 t worth adding a sentence to say that firewalls  allow such packets? The use of a non-127/8 address may alleviate this case as well.

The rest of the draft looks good to me,

Dinesh 

On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dinesh,
I greatly appreciate your comments. Please heave a look at the attached copy of the working version and its diff to -07 (latest in the datatracker).

Regards,
Greg

On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt <didutt@gmail.com> wrote:
I have the same feeling as Anoop. Greg, can you please point me to the latest draft so that I can quickly glance through it to be doubly sure,

Dinesh

On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Greg,

I think the draft is fine as is.

I discussion with Xiao Min was about #3 and I see that as unnecessary until we have a draft that explains why that is needed in the context of the NVO3 architecture.

Anoop

On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop, et al.,
I agree with your understanding of what is being defined in the current version of the BFD over VxLAN specification. But, as I understand, the WG is discussing the scope before the WGLC is closed. I believe there are three options:
  1. single BFD session between two VTEPs
  2. single BFD session per VNI between two VTEPs
  3. multiple BFD sessions per VNI between two VTEPs
The current text reflects #2. Is WG accepts this scope? If not, which option WG would accept?

Regards,
Greg

On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
I concur with Joel's assessment with the following clarifications.

The current document is already capable of monitoring multiple VNIs between VTEPs.

The issue under discussion was how do we use BFD to monitor multiple VAPs that use the same VNI between a pair of VTEPs.  The use case for this is not clear to me, as from my understanding, we cannot have a situation with multiple VAPs using the same VNI--there is 1:1 mapping between VAP and VNI.

Anoop

On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
 From what I can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.  There is no 

need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.   The 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>     Thanks for your explanation. This helps a lot. I would wait for more

>> comments from others to see if this what we need in this draft to be

>> supported based on that we can provide appropriate sections in the draft.

> 

> The threads on the list have spidered to the point where it is challenging

> to follow what the current status of the draft is, or should be.  :-)

> 

> However, if I've followed things properly, the question below is really the

> hinge point on what our encapsulation for BFD over vxlan should look like.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple BFD sessions

>>> for the same VNI or not, IMHO we should allow it, more explanation as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Architecture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>                      |         Data Center Network (IP)        |

>>>                      |                                         |

>>>                      +-----------------------------------------+

>>>                           |                           |

>>>                           |       Tunnel Overlay      |

>>>              +------------+---------+       +---------+------------+

>>>              | +----------+-------+ |       | +-------+----------+ |

>>>              | |  Overlay Module  | |       | |  Overlay Module  | |

>>>              | +---------+--------+ |       | +---------+--------+ |

>>>              |           |          |       |           |          |

>>>       NVE1   |           |          |       |           |          | NVE2

>>>              |  +--------+-------+  |       |  +--------+-------+  |

>>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |

>>>              |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |

>>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|

>>>              +----+-----+----+------+       +----+-----+-----+-----+

>>>                   |     |    |                   |     |     |

>>>                   |     |    |                   |     |     |

>>>                   |     |    |                   |     |     |

>>>            -------+-----+----+-------------------+-----+-----+-------

>>>                   |     |    |     Tenant        |     |     |

>>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3

>>>                  +---+ +---+ +---+             +---+ +---+   +---+

>>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|

>>>                  +---+ +---+ +---+             +---+ +---+   +---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 are actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session between VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same

>>> VNI1, I believe it's reasonable, so that's why I think we should allow it



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From: Anoop Ghanwani 
Date: Tue, 22 Oct 2019 23:09:48 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Dinesh Dutt 
Cc: Greg Mirsky , "Joel M. Halpern" ,  Jeffrey Haas , Santosh P K , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Greg,

The part about the use of 127/8 address appears to be a new thing
introduced in the version of the draft that is as of yet unpublished.  What
was the motivation for the change?  Previously, the DA was simply set to
the destination VTEP's IP address which seemed fine.

Anoop

On Tue, Oct 22, 2019 at 7:48 PM Dinesh Dutt  wrote:

> Greg,
>
> Two comments, one minor and one maybe not.
>
> - In section 3, there's a sentence that is: "BFD packets intended for a
> Hypervisor VTEP MUST NOT..". I recommend getting rid of the word
> "Hypervisor" ashe logic applies to any VTEP.
>
> - You already explained the precedence of the use of 127/8 address in the
> inner header in MPLS. I have no specific comments in that area. I have only
> two questions:
>    - Has anybody verified that the use of 127/8 address (and the right
> MAC) works with existing implementations, including the silicon ones? If
> this doesn't work there, is it worth adding the possibilit y of another
> address, one that is owned by the VTEP node?
>    - Do we know if Firewalls stop such VXLAN packets? I ask this because
> VXLAN has an IP header and I don't know if firewalls stop packets with
> 127/8 in the inner header. If not, is it worth adding a sentence to say
> that firewalls  allow such packets? The use of a non-127/8 address may
> alleviate this case as well.
>
> The rest of the draft looks good to me,
>
> Dinesh
>
> On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky 
> wrote:
>
> Hi Dinesh,
> I greatly appreciate your comments. Please heave a look at the attached
> copy of the working version and its diff to -07 (latest in the datatracker).
>
> Regards,
> Greg
>
> On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:
>
>> I have the same feeling as Anoop. Greg, can you please point me to the
>> latest draft so that I can quickly glance through it to be doubly sure,
>>
>> Dinesh
>>
>> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani 
>> wrote:
>>
>> Greg,
>>
>> I think the draft is fine as is.
>>
>> I discussion with Xiao Min was about #3 and I see that as unnecessary
>> until we have a draft that explains why that is needed in the context of
>> the NVO3 architecture.
>>
>> Anoop
>>
>> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
>> wrote:
>>
>>> Hi Anoop, et al.,
>>> I agree with your understanding of what is being defined in the current
>>> version of the BFD over VxLAN specification. But, as I understand, the WG
>>> is discussing the scope before the WGLC is closed. I believe there are
>>> three options:
>>>
>>>    1. single BFD session between two VTEPs
>>>    2. single BFD session per VNI between two VTEPs
>>>    3. multiple BFD sessions per VNI between two VTEPs
>>>
>>> The current text reflects #2. Is WG accepts this scope? If not, which
>>> option WG would accept?
>>>
>>> Regards,
>>> Greg
>>>
>>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
>>> wrote:
>>>
>>>> I concur with Joel's assessment with the following clarifications.
>>>>
>>>> The current document is already capable of monitoring multiple VNIs
>>>> between VTEPs.
>>>>
>>>> The issue under discussion was how do we use BFD to monitor multiple
>>>> VAPs that use the same VNI between a pair of VTEPs.  The use case for this
>>>> is not clear to me, as from my understanding, we cannot have a situation
>>>> with multiple VAPs using the same VNI--there is 1:1 mapping between VAP and
>>>> VNI.
>>>>
>>>> Anoop
>>>>
>>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>>>> wrote:
>>>>
>>>>>  From what I can tell, there are two separate problems.
>>>>> The document we have is a VTEP-VTEP monitoring document.  There is no
>>>>> need for that document to handle the multiple VNI case.
>>>>> If folks want a protocol for doing BFD monitoring of things behind the
>>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>>> encoding will be a tenant encoding, and thus sesparate from what is
>>>>> defined in this document.
>>>>>
>>>>> Yours,
>>>>> Joel
>>>>>
>>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>>> > Santosh and others,
>>>>> >
>>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>>> >>     Thanks for your explanation. This helps a lot. I would wait for
>>>>> more
>>>>> >> comments from others to see if this what we need in this draft to be
>>>>> >> supported based on that we can provide appropriate sections in the
>>>>> draft.
>>>>> >
>>>>> > The threads on the list have spidered to the point where it is
>>>>> challenging
>>>>> > to follow what the current status of the draft is, or should be.  :-)
>>>>> >
>>>>> > However, if I've followed things properly, the question below is
>>>>> really the
>>>>> > hinge point on what our encapsulation for BFD over vxlan should look
>>>>> like.
>>>>> > Correct?
>>>>> >
>>>>> > Essentially, do we or do we not require the ability to permit
>>>>> multiple BFD
>>>>> > sessions between distinct VAPs?
>>>>> >
>>>>> > If this is so, do we have a sense as to how we should proceed?
>>>>> >
>>>>> > -- Jeff
>>>>> >
>>>>> > [context preserved below...]
>>>>> >
>>>>> >> Santosh P K
>>>>> >>
>>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>>> >>
>>>>> >>> Hi Santosh,
>>>>> >>>
>>>>> >>>
>>>>> >>> With regard to the question whether we should allow multiple BFD
>>>>> sessions
>>>>> >>> for the same VNI or not, IMHO we should allow it, more explanation
>>>>> as
>>>>> >>> follows.
>>>>> >>>
>>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An
>>>>> Architecture for
>>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>> >>>
>>>>> >>>                      |         Data Center Network (IP)        |
>>>>> >>>                      |                                         |
>>>>> >>>                      +-----------------------------------------+
>>>>> >>>                           |                           |
>>>>> >>>                           |       Tunnel Overlay      |
>>>>> >>>              +------------+---------+
>>>>>  +---------+------------+
>>>>> >>>              | +----------+-------+ |       | +-------+----------+
>>>>> |
>>>>> >>>              | |  Overlay Module  | |       | |  Overlay Module  |
>>>>> |
>>>>> >>>              | +---------+--------+ |       | +---------+--------+
>>>>> |
>>>>> >>>              |           |          |       |           |
>>>>> |
>>>>> >>>       NVE1   |           |          |       |           |
>>>>> | NVE2
>>>>> >>>              |  +--------+-------+  |       |  +--------+-------+
>>>>> |
>>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |
>>>>> |
>>>>> >>>              |  +-+-----+----+---+  |       |  +-+-----+-----+--+
>>>>> |
>>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     |
>>>>> VAP3|
>>>>> >>>              +----+-----+----+------+
>>>>>  +----+-----+-----+-----+
>>>>> >>>                   |     |    |                   |     |     |
>>>>> >>>                   |     |    |                   |     |     |
>>>>> >>>                   |     |    |                   |     |     |
>>>>> >>>
>>>>> -------+-----+----+-------------------+-----+-----+-------
>>>>> >>>                   |     |    |     Tenant        |     |     |
>>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>>> >>>
>>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>> actually
>>>>> >>> initiated and terminated at VAP of NVE.
>>>>> >>>
>>>>> >>> If the network operator want to set up one BFD session between
>>>>> VAP1 of
>>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session between
>>>>> VAP3 of
>>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the
>>>>> same
>>>>> >>> VNI1, I believe it's reasonable, so that's why I think we should
>>>>> allow it
>>>>>
>>>>> _______________________________________________
>>>>> nvo3 mailing list
>>>>> nvo3@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>
>>>>

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Hi Greg,

The part about the =
use of 127/8 address appears to be a new thing introduced in the version of=
 the draft that is as of yet unpublished.=C2=A0 What was the motivation for=
 the change?=C2=A0 Previously, the DA was simply set to the destination VTE=
P's IP address which seemed fine.

Anoop
<=
br>
On Tue,=
 Oct 22, 2019 at 7:48 PM Dinesh Dutt <didutt@gmail.com> wrote:
Greg,

Two comments, one minor and one =
maybe not.

- In section 3, there's a sentence =
that is: "BFD packets intended for a Hypervisor VTEP MUST NOT..".=
 I recommend getting rid of the word "Hypervisor" ashe logic appl=
ies to any VTEP.

- You already explained the prece=
dence of the use of 127/8 address in the inner header in MPLS. I have no sp=
ecific comments in that area. I have only two questions:=C2=A0
=
=C2=A0 =C2=A0- Has anybody verified that the use of 127/8 address (and the =
right MAC) works with existing implementations, including the silicon ones?=
 If this doesn't work there, is it worth adding the possibilit y of ano=
ther address, one that is owned by the VTEP node?
=C2=A0 =C2=A0- =
Do we know if Firewalls stop such VXLAN packets? I ask this because VXLAN h=
as an IP header and I don't know if firewalls stop packets with 127/8 i=
n the inner header. If not, is it worth adding a sentence to say that firew=
alls =C2=A0allow such packets? The use of a non-127/8 address may alleviate=
 this case as well.

The rest of the draft looks go=
od to me,

Dinesh=C2=A0

On Wed, Oct 23, 2019 a=
t 7:58 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dinesh,
I greatly appreciate your comments. Plea=
se heave a look at the attached copy of the working version and its diff to=
 -07 (latest in the datatracker).

Regards,
Greg

On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt <didutt@gmail.com> wrote:
=

I have the same feeling as Anoop. Greg, can you please point me to the l=
atest draft so that I can quickly glance through it to be doubly sure,

Dinesh

On Wed, Oct 23=
, 2019 at 4:35 AM, Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Greg,

I think the draft is=
 fine as is.

I discussion with Xiao Min was about =
#3 and I see that as unnecessary until we have a draft that explains why th=
at is needed in the context of the NVO3 architecture.

<=
div>Anoop

On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com&=
gt; wrote:
Hi Anoop, et al.,
I agree with your understanding of what i=
s being defined in the current version of the BFD over VxLAN specification.=
 But, as I understand, the WG is discussing the scope before the WGLC is cl=
osed. I believe there are three options:
  1. single BFD sessi=
on between two VTEPs
  2. single BFD session per VNI between two VTEPs
  3. multiple BFD sessions per VNI between two VTEPs
The cu=
rrent text reflects #2. Is WG accepts this scope? If not, which option WG w=
ould accept?

Regards,
Greg

On=
 Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
I concur with Joel's assessment with the following clarifi=
cations.

The current document is already capable of moni=
toring multiple VNIs between VTEPs.

The issue unde=
r discussion was how do we use BFD to monitor multiple VAPs that use the sa=
me VNI between a pair of VTEPs.=C2=A0 The use case for this is not clear to=
 me, as from my understanding, we cannot have a situation with multiple VAP=
s using the same VNI--there is 1:1 mapping between VAP and VNI.
<=
br>
Anoop

On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern &l=
t;jmh@joelhalpern.=
com> wrote:
=C2=A0From what I can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani , Dinesh Dutt 
Cc: Greg Mirsky , draft-ietf-bfd-vxlan@ietf.org, NVO3 , Santosh P K , Jeffrey Haas , rtg-bfd WG , "Joel M. Halpern" , "T. Sridhar" , xiao.min2@zte.com.cn
References:  <201909251039413767352@zte.com.cn>  <20191021210752.GA8916@pfrc.org> <0e99a541-b2ca-85d4-4a8f-1165cf7ac01e@joelhalpern.com>    <1571795542.10436.5@smtp.gmail.com>  <1571798869.2855.1@smtp.gmail.com> 
From: "Joel M. Halpern" 
Message-ID: <5a3165a7-d531-cc7b-828f-78f43d94a54d@joelhalpern.com>
Date: Wed, 23 Oct 2019 07:49:01 -0400
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Anoop, you refer to "the destination VTEP's IP address".  Since this is 
a field inside the Ethernet header inside the VxLAN header, what VTEP 
assigned IP address?  The customer (whose address space this is in may 
not be using IP.  Or may be using IP and presumably has NOT assigned an 
IP address to the VTEP.

If we were using VNI 0, then wew would be free to use whatever IP 
address we wanted, as there would be no tenant.  Since folks seem to 
want to use option #2, something has to go in the IP dest address. 
Since there is no IP assigned to the VTEP within the VNI being tested, 
we have to specify something.

Yours,
Joel

On 10/23/2019 2:09 AM, Anoop Ghanwani wrote:
> Hi Greg,
> 
> The part about the use of 127/8 address appears to be a new thing 
> introduced in the version of the draft that is as of yet unpublished.  
> What was the motivation for the change?  Previously, the DA was simply 
> set to the destination VTEP's IP address which seemed fine.
> 
> Anoop
> 
> On Tue, Oct 22, 2019 at 7:48 PM Dinesh Dutt  > wrote:
> 
>     Greg,
> 
>     Two comments, one minor and one maybe not.
> 
>     - In section 3, there's a sentence that is: "BFD packets intended
>     for a Hypervisor VTEP MUST NOT..". I recommend getting rid of the
>     word "Hypervisor" ashe logic applies to any VTEP.
> 
>     - You already explained the precedence of the use of 127/8 address
>     in the inner header in MPLS. I have no specific comments in that
>     area. I have only two questions:
>         - Has anybody verified that the use of 127/8 address (and the
>     right MAC) works with existing implementations, including the
>     silicon ones? If this doesn't work there, is it worth adding the
>     possibilit y of another address, one that is owned by the VTEP node?
>         - Do we know if Firewalls stop such VXLAN packets? I ask this
>     because VXLAN has an IP header and I don't know if firewalls stop
>     packets with 127/8 in the inner header. If not, is it worth adding a
>     sentence to say that firewalls  allow such packets? The use of a
>     non-127/8 address may alleviate this case as well.
> 
>     The rest of the draft looks good to me,
> 
>     Dinesh
> 
>     On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky      > wrote:
>>     Hi Dinesh,
>>     I greatly appreciate your comments. Please heave a look at the
>>     attached copy of the working version and its diff to -07 (latest
>>     in the datatracker).
>>
>>     Regards,
>>     Greg
>>
>>     On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt >     > wrote:
>>
>>         I have the same feeling as Anoop. Greg, can you please point
>>         me to the latest draft so that I can quickly glance through it
>>         to be doubly sure,
>>
>>         Dinesh
>>
>>         On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani
>>         > wrote:
>>>         Greg,
>>>
>>>         I think the draft is fine as is.
>>>
>>>         I discussion with Xiao Min was about #3 and I see that as
>>>         unnecessary until we have a draft that explains why that is
>>>         needed in the context of the NVO3 architecture.
>>>
>>>         Anoop
>>>
>>>         On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky
>>>         > wrote:
>>>
>>>             Hi Anoop, et al.,
>>>             I agree with your understanding of what is being defined
>>>             in the current version of the BFD over VxLAN
>>>             specification. But, as I understand, the WG is discussing
>>>             the scope before the WGLC is closed. I believe there are
>>>             three options:
>>>
>>>              1. single BFD session between two VTEPs
>>>              2. single BFD session per VNI between two VTEPs
>>>              3. multiple BFD sessions per VNI between two VTEPs
>>>
>>>             The current text reflects #2. Is WG accepts this scope?
>>>             If not, which option WG would accept?
>>>
>>>             Regards,
>>>             Greg
>>>
>>>             On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani
>>>             > wrote:
>>>
>>>                 I concur with Joel's assessment with the following
>>>                 clarifications.
>>>
>>>                 The current document is already capable of monitoring
>>>                 multiple VNIs between VTEPs.
>>>
>>>                 The issue under discussion was how do we use BFD to
>>>                 monitor multiple VAPs that use the same VNI between a
>>>                 pair of VTEPs.  The use case for this is not clear to
>>>                 me, as from my understanding, we cannot have a
>>>                 situation with multiple VAPs using the same
>>>                 VNI--there is 1:1 mapping between VAP and VNI.
>>>
>>>                 Anoop
>>>
>>>                 On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern
>>>                 > wrote:
>>>
>>>                      From what I can tell, there are two separate
>>>                     problems.
>>>                     The document we have is a VTEP-VTEP monitoring
>>>                     document.  There is no
>>>                     need for that document to handle the multiple VNI
>>>                     case.
>>>                     If folks want a protocol for doing BFD monitoring
>>>                     of things behind the
>>>                     VTEPs (multiple VNIs), then do that as a separate
>>>                     document.   The
>>>                     encoding will be a tenant encoding, and thus
>>>                     sesparate from what is
>>>                     defined in this document.
>>>
>>>                     Yours,
>>>                     Joel
>>>
>>>                     On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>                     > Santosh and others,
>>>                     >
>>>                     > On Thu, Oct 03, 2019 at 07:50:20PM +0530,
>>>                     Santosh P K wrote:
>>>                     >>     Thanks for your explanation. This helps a
>>>                     lot. I would wait for more
>>>                     >> comments from others to see if this what we
>>>                     need in this draft to be
>>>                     >> supported based on that we can provide
>>>                     appropriate sections in the draft.
>>>                     >
>>>                     > The threads on the list have spidered to the
>>>                     point where it is challenging
>>>                     > to follow what the current status of the draft
>>>                     is, or should be.  :-)
>>>                     >
>>>                     > However, if I've followed things properly, the
>>>                     question below is really the
>>>                     > hinge point on what our encapsulation for BFD
>>>                     over vxlan should look like.
>>>                     > Correct?
>>>                     >
>>>                     > Essentially, do we or do we not require the
>>>                     ability to permit multiple BFD
>>>                     > sessions between distinct VAPs?
>>>                     >
>>>                     > If this is so, do we have a sense as to how we
>>>                     should proceed?
>>>                     >
>>>                     > -- Jeff
>>>                     >
>>>                     > [context preserved below...]
>>>                     >
>>>                     >> Santosh P K
>>>                     >>
>>>                     >> On Wed, Sep 25, 2019 at 8:10 AM
>>>                     >>                     > wrote:
>>>                     >>
>>>                     >>> Hi Santosh,
>>>                     >>>
>>>                     >>>
>>>                     >>> With regard to the question whether we should
>>>                     allow multiple BFD sessions
>>>                     >>> for the same VNI or not, IMHO we should allow
>>>                     it, more explanation as
>>>                     >>> follows.
>>>                     >>>
>>>                     >>> Below is a figure derived from figure 2 of
>>>                     RFC8014 (An Architecture for
>>>                     >>> Data-Center Network Virtualization over Layer
>>>                     3 (NVO3)).
>>>                     >>>
>>>                     >>>                      |         Data Center
>>>                     Network (IP)        |
>>>                     >>>                      |                       
>>>                                      |
>>>                     >>>                     
>>>                     +-----------------------------------------+
>>>                     >>>                           |                 
>>>                              |
>>>                     >>>                           |       Tunnel
>>>                     Overlay      |
>>>                     >>>              +------------+---------+     
>>>                      +---------+------------+
>>>                     >>>              | +----------+-------+ |       |
>>>                     +-------+----------+ |
>>>                     >>>              | |  Overlay Module  | |       |
>>>                     |  Overlay Module  | |
>>>                     >>>              | +---------+--------+ |       |
>>>                     +---------+--------+ |
>>>                     >>>              |           |          |     
>>>                      |           |          |
>>>                     >>>       NVE1   |           |          |     
>>>                      |           |          | NVE2
>>>                     >>>              |  +--------+-------+  |     
>>>                      |  +--------+-------+  |
>>>                     >>>              |  |VNI1 VNI2  VNI1 |  |     
>>>                      |  | VNI1 VNI2 VNI1 |  |
>>>                     >>>              |  +-+-----+----+---+  |     
>>>                      |  +-+-----+-----+--+  |
>>>                     >>>              |VAP1| VAP2|    | VAP3 |     
>>>                      |VAP1| VAP2|     | VAP3|
>>>                     >>>              +----+-----+----+------+     
>>>                      +----+-----+-----+-----+
>>>                     >>>                   |     |    |               
>>>                        |     |     |
>>>                     >>>                   |     |    |               
>>>                        |     |     |
>>>                     >>>                   |     |    |               
>>>                        |     |     |
>>>                     >>>           
>>>                     -------+-----+----+-------------------+-----+-----+-------
>>>                     >>>                   |     |    |     Tenant   
>>>                         |     |     |
>>>                     >>>              TSI1 | TSI2|    | TSI3         
>>>                     TSI1| TSI2|     |TSI3
>>>                     >>>                  +---+ +---+ +---+           
>>>                      +---+ +---+   +---+
>>>                     >>>                  |TS1| |TS2| |TS3|           
>>>                      |TS4| |TS5|   |TS6|
>>>                     >>>                  +---+ +---+ +---+           
>>>                      +---+ +---+   +---+
>>>                     >>>
>>>                     >>> To my understanding, the BFD sessions between
>>>                     NVE1 and NVE2 are actually
>>>                     >>> initiated and terminated at VAP of NVE.
>>>                     >>>
>>>                     >>> If the network operator want to set up one
>>>                     BFD session between VAP1 of
>>>                     >>> NVE1 and VAP1of NVE2, at the same time
>>>                     another BFD session between VAP3 of
>>>                     >>> NVE1 and VAP3 of NVE2, although the two BFD
>>>                     sessions are for the same
>>>                     >>> VNI1, I believe it's reasonable, so that's
>>>                     why I think we should allow it
>>>
>>>                     _______________________________________________
>>>                     nvo3 mailing list
>>>                     nvo3@ietf.org 
>>>                     https://www.ietf.org/mailman/listinfo/nvo3
>>>
> 
> _______________________________________________
> nvo3 mailing list
> nvo3@ietf.org
> https://www.ietf.org/mailman/listinfo/nvo3
> 


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In-Reply-To: 
From: Santosh P K 
Date: Wed, 23 Oct 2019 20:08:37 +0530
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani 
Cc: Dinesh Dutt , Greg Mirsky ,  "Joel M. Halpern" , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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--0000000000000ad451059594e0a6
Content-Type: text/plain; charset="UTF-8"

Anoop,
   I guess there were multiple discussion over this should we have inner
TTL as 1 or destination IP address as 127/8 range so that if packet gets
exposed in underlay it should not be routed via underlay to VTEP.

Thanks
Santosh P K

On Wed, Oct 23, 2019 at 11:40 AM Anoop Ghanwani 
wrote:

> Hi Greg,
>
> The part about the use of 127/8 address appears to be a new thing
> introduced in the version of the draft that is as of yet unpublished.  What
> was the motivation for the change?  Previously, the DA was simply set to
> the destination VTEP's IP address which seemed fine.
>
> Anoop
>
> On Tue, Oct 22, 2019 at 7:48 PM Dinesh Dutt  wrote:
>
>> Greg,
>>
>> Two comments, one minor and one maybe not.
>>
>> - In section 3, there's a sentence that is: "BFD packets intended for a
>> Hypervisor VTEP MUST NOT..". I recommend getting rid of the word
>> "Hypervisor" ashe logic applies to any VTEP.
>>
>> - You already explained the precedence of the use of 127/8 address in the
>> inner header in MPLS. I have no specific comments in that area. I have only
>> two questions:
>>    - Has anybody verified that the use of 127/8 address (and the right
>> MAC) works with existing implementations, including the silicon ones? If
>> this doesn't work there, is it worth adding the possibilit y of another
>> address, one that is owned by the VTEP node?
>>    - Do we know if Firewalls stop such VXLAN packets? I ask this because
>> VXLAN has an IP header and I don't know if firewalls stop packets with
>> 127/8 in the inner header. If not, is it worth adding a sentence to say
>> that firewalls  allow such packets? The use of a non-127/8 address may
>> alleviate this case as well.
>>
>> The rest of the draft looks good to me,
>>
>> Dinesh
>>
>> On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky 
>> wrote:
>>
>> Hi Dinesh,
>> I greatly appreciate your comments. Please heave a look at the attached
>> copy of the working version and its diff to -07 (latest in the datatracker).
>>
>> Regards,
>> Greg
>>
>> On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:
>>
>>> I have the same feeling as Anoop. Greg, can you please point me to the
>>> latest draft so that I can quickly glance through it to be doubly sure,
>>>
>>> Dinesh
>>>
>>> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani 
>>> wrote:
>>>
>>> Greg,
>>>
>>> I think the draft is fine as is.
>>>
>>> I discussion with Xiao Min was about #3 and I see that as unnecessary
>>> until we have a draft that explains why that is needed in the context of
>>> the NVO3 architecture.
>>>
>>> Anoop
>>>
>>> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
>>> wrote:
>>>
>>>> Hi Anoop, et al.,
>>>> I agree with your understanding of what is being defined in the current
>>>> version of the BFD over VxLAN specification. But, as I understand, the WG
>>>> is discussing the scope before the WGLC is closed. I believe there are
>>>> three options:
>>>>
>>>>    1. single BFD session between two VTEPs
>>>>    2. single BFD session per VNI between two VTEPs
>>>>    3. multiple BFD sessions per VNI between two VTEPs
>>>>
>>>> The current text reflects #2. Is WG accepts this scope? If not, which
>>>> option WG would accept?
>>>>
>>>> Regards,
>>>> Greg
>>>>
>>>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
>>>> wrote:
>>>>
>>>>> I concur with Joel's assessment with the following clarifications.
>>>>>
>>>>> The current document is already capable of monitoring multiple VNIs
>>>>> between VTEPs.
>>>>>
>>>>> The issue under discussion was how do we use BFD to monitor multiple
>>>>> VAPs that use the same VNI between a pair of VTEPs.  The use case for this
>>>>> is not clear to me, as from my understanding, we cannot have a situation
>>>>> with multiple VAPs using the same VNI--there is 1:1 mapping between VAP and
>>>>> VNI.
>>>>>
>>>>> Anoop
>>>>>
>>>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>>>>> wrote:
>>>>>
>>>>>>  From what I can tell, there are two separate problems.
>>>>>> The document we have is a VTEP-VTEP monitoring document.  There is no
>>>>>> need for that document to handle the multiple VNI case.
>>>>>> If folks want a protocol for doing BFD monitoring of things behind
>>>>>> the
>>>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>>>> encoding will be a tenant encoding, and thus sesparate from what is
>>>>>> defined in this document.
>>>>>>
>>>>>> Yours,
>>>>>> Joel
>>>>>>
>>>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>>>> > Santosh and others,
>>>>>> >
>>>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>>>> >>     Thanks for your explanation. This helps a lot. I would wait
>>>>>> for more
>>>>>> >> comments from others to see if this what we need in this draft to
>>>>>> be
>>>>>> >> supported based on that we can provide appropriate sections in the
>>>>>> draft.
>>>>>> >
>>>>>> > The threads on the list have spidered to the point where it is
>>>>>> challenging
>>>>>> > to follow what the current status of the draft is, or should be.
>>>>>> :-)
>>>>>> >
>>>>>> > However, if I've followed things properly, the question below is
>>>>>> really the
>>>>>> > hinge point on what our encapsulation for BFD over vxlan should
>>>>>> look like.
>>>>>> > Correct?
>>>>>> >
>>>>>> > Essentially, do we or do we not require the ability to permit
>>>>>> multiple BFD
>>>>>> > sessions between distinct VAPs?
>>>>>> >
>>>>>> > If this is so, do we have a sense as to how we should proceed?
>>>>>> >
>>>>>> > -- Jeff
>>>>>> >
>>>>>> > [context preserved below...]
>>>>>> >
>>>>>> >> Santosh P K
>>>>>> >>
>>>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>>>> >>
>>>>>> >>> Hi Santosh,
>>>>>> >>>
>>>>>> >>>
>>>>>> >>> With regard to the question whether we should allow multiple BFD
>>>>>> sessions
>>>>>> >>> for the same VNI or not, IMHO we should allow it, more
>>>>>> explanation as
>>>>>> >>> follows.
>>>>>> >>>
>>>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An
>>>>>> Architecture for
>>>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>> >>>
>>>>>> >>>                      |         Data Center Network (IP)        |
>>>>>> >>>                      |                                         |
>>>>>> >>>                      +-----------------------------------------+
>>>>>> >>>                           |                           |
>>>>>> >>>                           |       Tunnel Overlay      |
>>>>>> >>>              +------------+---------+
>>>>>>  +---------+------------+
>>>>>> >>>              | +----------+-------+ |       |
>>>>>> +-------+----------+ |
>>>>>> >>>              | |  Overlay Module  | |       | |  Overlay Module
>>>>>> | |
>>>>>> >>>              | +---------+--------+ |       |
>>>>>> +---------+--------+ |
>>>>>> >>>              |           |          |       |           |
>>>>>>   |
>>>>>> >>>       NVE1   |           |          |       |           |
>>>>>>   | NVE2
>>>>>> >>>              |  +--------+-------+  |       |
>>>>>> +--------+-------+  |
>>>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1
>>>>>> |  |
>>>>>> >>>              |  +-+-----+----+---+  |       |
>>>>>> +-+-----+-----+--+  |
>>>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     |
>>>>>> VAP3|
>>>>>> >>>              +----+-----+----+------+
>>>>>>  +----+-----+-----+-----+
>>>>>> >>>                   |     |    |                   |     |     |
>>>>>> >>>                   |     |    |                   |     |     |
>>>>>> >>>                   |     |    |                   |     |     |
>>>>>> >>>
>>>>>> -------+-----+----+-------------------+-----+-----+-------
>>>>>> >>>                   |     |    |     Tenant        |     |     |
>>>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>>>> >>>
>>>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>>> actually
>>>>>> >>> initiated and terminated at VAP of NVE.
>>>>>> >>>
>>>>>> >>> If the network operator want to set up one BFD session between
>>>>>> VAP1 of
>>>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session
>>>>>> between VAP3 of
>>>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the
>>>>>> same
>>>>>> >>> VNI1, I believe it's reasonable, so that's why I think we should
>>>>>> allow it
>>>>>>
>>>>>> _______________________________________________
>>>>>> nvo3 mailing list
>>>>>> nvo3@ietf.org
>>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>>
>>>>>

--0000000000000ad451059594e0a6
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Anoop,
=C2=A0 =C2=A0I guess there were multiple discus=
sion over this should we have inner TTL as 1 or destination IP address as 1=
27/8 range so that if packet=C2=A0gets exposed in underlay it should not be=
 routed via underlay to VTEP.

Thanks
San=
tosh P K=C2=A0

On Wed, Oct 23, 2019 at 11:40 AM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:<=
br>
Hi Greg,

The part about the use of 127/8 add=
ress appears to be a new thing introduced in the version of the draft that =
is as of yet unpublished.=C2=A0 What was the motivation for the change?=C2=
=A0 Previously, the DA was simply set to the destination VTEP's IP addr=
ess which seemed fine.

Anoop

On Tue, Oct 22, 2019=
 at 7:48 PM Dinesh Dutt <didutt@gmail.com> wrote:
Greg,

Two comments, one minor and one maybe not.

- In s=
ection 3, there's a sentence that is: "BFD packets intended for a =
Hypervisor VTEP MUST NOT..". I recommend getting rid of the word "=
;Hypervisor" ashe logic applies to any VTEP.

=
- You already explained the precedence of the use of 127/8 address in the i=
nner header in MPLS. I have no specific comments in that area. I have only =
two questions:=C2=A0
=C2=A0 =C2=A0- Has anybody verified that the=
 use of 127/8 address (and the right MAC) works with existing implementatio=
ns, including the silicon ones? If this doesn't work there, is it worth=
 adding the possibilit y of another address, one that is owned by the VTEP =
node?
=C2=A0 =C2=A0- Do we know if Firewalls stop such VXLAN pack=
ets? I ask this because VXLAN has an IP header and I don't know if fire=
walls stop packets with 127/8 in the inner header. If not, is it worth addi=
ng a sentence to say that firewalls =C2=A0allow such packets? The use of a =
non-127/8 address may alleviate this case as well.

The rest of the draft looks good to me,

Dinesh=C2=
=A0

On Wed, Oct 23, 2019 at 7:58 AM, Greg =
Mirsky <gregi=
mirsky@gmail.com> wrote:
Hi Dinesh,
I greatly appreciate your comments. Please heave a look a=
t the attached copy of the working version and its diff to -07 (latest in t=
he datatracker).

Regards,
Greg

On T=
ue, Oct 22, 2019 at 9:52 PM Dinesh Dutt <didutt@gmail.com> wrote:
I have the same feeling as Anoop. Greg, can you please point=
 me to the latest draft so that I can quickly glance through it to be doubl=
y sure,

Dinesh

On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani &=
lt;anoop@alumni.=
duke.edu> wrote:
Greg,=


I think the draft is fine as is.

I discussion with Xiao Min was about #3 and I see that as unnecessary un=
til we have a draft that explains why that is needed in the context of the =
NVO3 architecture.

Anoop

On Tue, Oct 22, 2019=
 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop, et al.,
I =
agree with your understanding of what is being defined in the current versi=
on of the BFD over VxLAN specification. But, as I understand, the WG is dis=
cussing the scope before the WGLC is closed. I believe there are three opti=
ons:
  1. single BFD session between two VTEPs
  2. single =
BFD session per VNI between two VTEPs
  3. multiple BFD sessions per VNI=
 between two VTEPs
The current text reflects #2. Is WG accept=
s this scope? If not, which option WG would accept?

Regards,
Greg

<=
div dir=3D"ltr" class=3D"gmail_attr">On Tue, Oct 22, 2019 at 2:09 PM Anoop =
Ghanwani <ano=
op@alumni.duke.edu> wrote:
I concur with Joel'=
s assessment with the following clarifications.

The curr=
ent document is already capable of monitoring multiple VNIs between VTEPs.<=
/div>

The issue under discussion was how do we use BFD t=
o monitor multiple VAPs that use the same VNI between a pair of VTEPs.=C2=
=A0 The use case for this is not clear to me, as from my understanding, we =
cannot have a situation with multiple VAPs using the same VNI--there is 1:1=
 mapping between VAP and VNI.

Anoop
On Tue, O=
ct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
=C2=A0From what I can tell, the=
re are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



_______________________________________________

nvo3 mailing list

nvo3@ietf.org

https://www.ietf.org/mailman/listinfo/nvo3











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From: Santosh P K 
Date: Wed, 23 Oct 2019 20:17:22 +0530
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Dinesh Dutt 
Cc: Greg Mirsky , Anoop Ghanwani , "Joel M. Halpern" , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Dinesh,
     Please see my inline comments [SPK]

>
> - In section 3, there's a sentence that is: "BFD packets intended for a
> Hypervisor VTEP MUST NOT..". I recommend getting rid of the word
> "Hypervisor" ashe logic applies to any VTEP.
>
> [SPK] Thanks for comments. We will change this.


> - You already explained the precedence of the use of 127/8 address in the
> inner header in MPLS. I have no specific comments in that area. I have only
> two questions:
>    - Has anybody verified that the use of 127/8 address (and the right
> MAC) works with existing implementations, including the silicon ones? If
> this doesn't work there, is it worth adding the possibilit y of another
> address, one that is owned by the VTEP node?
>
   - Do we know if Firewalls stop such VXLAN packets? I ask this because
> VXLAN has an IP header and I don't know if firewalls stop packets with
> 127/8 in the inner header. If not, is it worth adding a sentence to say
> that firewalls  allow such packets? The use of a non-127/8 address may
> alleviate this case as well.
>

[SPK] I think we may need to add the text about firewall as some checks in
firewall will be there if they are not already using MPLS OAM which has
inner IP header with 127/8 address range.


>
> The rest of the draft looks good to me,
>
> Dinesh
>
> On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky 
> wrote:
>
> Hi Dinesh,
> I greatly appreciate your comments. Please heave a look at the attached
> copy of the working version and its diff to -07 (latest in the datatracker).
>
> Regards,
> Greg
>
> On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:
>
>> I have the same feeling as Anoop. Greg, can you please point me to the
>> latest draft so that I can quickly glance through it to be doubly sure,
>>
>> Dinesh
>>
>> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani 
>> wrote:
>>
>> Greg,
>>
>> I think the draft is fine as is.
>>
>> I discussion with Xiao Min was about #3 and I see that as unnecessary
>> until we have a draft that explains why that is needed in the context of
>> the NVO3 architecture.
>>
>> Anoop
>>
>> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
>> wrote:
>>
>>> Hi Anoop, et al.,
>>> I agree with your understanding of what is being defined in the current
>>> version of the BFD over VxLAN specification. But, as I understand, the WG
>>> is discussing the scope before the WGLC is closed. I believe there are
>>> three options:
>>>
>>>    1. single BFD session between two VTEPs
>>>    2. single BFD session per VNI between two VTEPs
>>>    3. multiple BFD sessions per VNI between two VTEPs
>>>
>>> The current text reflects #2. Is WG accepts this scope? If not, which
>>> option WG would accept?
>>>
>>> Regards,
>>> Greg
>>>
>>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
>>> wrote:
>>>
>>>> I concur with Joel's assessment with the following clarifications.
>>>>
>>>> The current document is already capable of monitoring multiple VNIs
>>>> between VTEPs.
>>>>
>>>> The issue under discussion was how do we use BFD to monitor multiple
>>>> VAPs that use the same VNI between a pair of VTEPs.  The use case for this
>>>> is not clear to me, as from my understanding, we cannot have a situation
>>>> with multiple VAPs using the same VNI--there is 1:1 mapping between VAP and
>>>> VNI.
>>>>
>>>> Anoop
>>>>
>>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>>>> wrote:
>>>>
>>>>>  From what I can tell, there are two separate problems.
>>>>> The document we have is a VTEP-VTEP monitoring document.  There is no
>>>>> need for that document to handle the multiple VNI case.
>>>>> If folks want a protocol for doing BFD monitoring of things behind the
>>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>>> encoding will be a tenant encoding, and thus sesparate from what is
>>>>> defined in this document.
>>>>>
>>>>> Yours,
>>>>> Joel
>>>>>
>>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>>> > Santosh and others,
>>>>> >
>>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>>> >>     Thanks for your explanation. This helps a lot. I would wait for
>>>>> more
>>>>> >> comments from others to see if this what we need in this draft to be
>>>>> >> supported based on that we can provide appropriate sections in the
>>>>> draft.
>>>>> >
>>>>> > The threads on the list have spidered to the point where it is
>>>>> challenging
>>>>> > to follow what the current status of the draft is, or should be.  :-)
>>>>> >
>>>>> > However, if I've followed things properly, the question below is
>>>>> really the
>>>>> > hinge point on what our encapsulation for BFD over vxlan should look
>>>>> like.
>>>>> > Correct?
>>>>> >
>>>>> > Essentially, do we or do we not require the ability to permit
>>>>> multiple BFD
>>>>> > sessions between distinct VAPs?
>>>>> >
>>>>> > If this is so, do we have a sense as to how we should proceed?
>>>>> >
>>>>> > -- Jeff
>>>>> >
>>>>> > [context preserved below...]
>>>>> >
>>>>> >> Santosh P K
>>>>> >>
>>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>>> >>
>>>>> >>> Hi Santosh,
>>>>> >>>
>>>>> >>>
>>>>> >>> With regard to the question whether we should allow multiple BFD
>>>>> sessions
>>>>> >>> for the same VNI or not, IMHO we should allow it, more explanation
>>>>> as
>>>>> >>> follows.
>>>>> >>>
>>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An
>>>>> Architecture for
>>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>> >>>
>>>>> >>>                      |         Data Center Network (IP)        |
>>>>> >>>                      |                                         |
>>>>> >>>                      +-----------------------------------------+
>>>>> >>>                           |                           |
>>>>> >>>                           |       Tunnel Overlay      |
>>>>> >>>              +------------+---------+
>>>>>  +---------+------------+
>>>>> >>>              | +----------+-------+ |       | +-------+----------+
>>>>> |
>>>>> >>>              | |  Overlay Module  | |       | |  Overlay Module  |
>>>>> |
>>>>> >>>              | +---------+--------+ |       | +---------+--------+
>>>>> |
>>>>> >>>              |           |          |       |           |
>>>>> |
>>>>> >>>       NVE1   |           |          |       |           |
>>>>> | NVE2
>>>>> >>>              |  +--------+-------+  |       |  +--------+-------+
>>>>> |
>>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |
>>>>> |
>>>>> >>>              |  +-+-----+----+---+  |       |  +-+-----+-----+--+
>>>>> |
>>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     |
>>>>> VAP3|
>>>>> >>>              +----+-----+----+------+
>>>>>  +----+-----+-----+-----+
>>>>> >>>                   |     |    |                   |     |     |
>>>>> >>>                   |     |    |                   |     |     |
>>>>> >>>                   |     |    |                   |     |     |
>>>>> >>>
>>>>> -------+-----+----+-------------------+-----+-----+-------
>>>>> >>>                   |     |    |     Tenant        |     |     |
>>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>>> >>>
>>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>> actually
>>>>> >>> initiated and terminated at VAP of NVE.
>>>>> >>>
>>>>> >>> If the network operator want to set up one BFD session between
>>>>> VAP1 of
>>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session between
>>>>> VAP3 of
>>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the
>>>>> same
>>>>> >>> VNI1, I believe it's reasonable, so that's why I think we should
>>>>> allow it
>>>>>
>>>>> _______________________________________________
>>>>> nvo3 mailing list
>>>>> nvo3@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>
>>>>

--000000000000412053059594ff94
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Dinesh,
=C2=A0 =C2=A0 =C2=A0Please see my i=
nline=C2=A0comments [SPK]

- In section 3, there's a sen=
tence that is: "BFD packets intended for a Hypervisor VTEP MUST NOT..&=
quot;. I recommend getting rid of the word "Hypervisor" ashe logi=
c applies to any VTEP.

[SPK] Th=
anks for comments. We will change this.=C2=A0
=C2=A0
- You already explained the=
 precedence of the use of 127/8 address in the inner header in MPLS. I have=
 no specific comments in that area. I have only two questions:=C2=A0
<=
div>=C2=A0 =C2=A0- Has anybody verified that the use of 127/8 address (and =
the right MAC) works with existing implementations, including the silicon o=
nes? If this doesn't work there, is it worth adding the possibilit y of=
 another address, one that is owned by the VTEP node?
=C2=A0 =C2=A0- Do we know if=
 Firewalls stop such VXLAN packets? I ask this because VXLAN has an IP head=
er and I don't know if firewalls stop packets with 127/8 in the inner h=
eader. If not, is it worth adding a sentence to say that firewalls =C2=A0al=
low such packets? The use of a non-127/8 address may alleviate this case as=
 well.
=C2=A0
[SPK] I think we may n=
eed to add the text about firewall as some checks in firewall will be there=
 if they are not already using MPLS OAM which has inner IP header with 127/=
8 address range.=C2=A0
=C2=A0

The rest of the draft looks good to me,
=


Dinesh=C2=A0

On Wed, Oct 23, 2019 at 7:58 AM, Greg=
 Mirsky <greg=
imirsky@gmail.com> wrote:
Hi Dinesh,
I greatly appreciate your comments. Please heave a look =
at the attached copy of the working version and its diff to -07 (latest in =
the datatracker).

Regards,
Greg

On =
Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt <didutt@gmail.com> wrote:
I have the sa=
me feeling as Anoop. Greg, can you please point me to the latest draft so t=
hat I can quickly glance through it to be doubly sure,

=

Dinesh

On Wed, Oct 23, 2019 at 4:35 A=
M, Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Greg,

I think the draft is fine as is.

I discussion with Xiao Min was about #3 and I see tha=
t as unnecessary until we have a draft that explains why that is needed in =
the context of the NVO3 architecture.

Anoop
<=
/div>
O=
n Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi An=
oop, et al.,
I agree with your understanding of what is being defined i=
n the current version of the BFD over VxLAN specification. But, as I unders=
tand, the WG is discussing the scope before the WGLC is closed. I believe t=
here are three options:
  1. single BFD session between two VT=
EPs
  2. single BFD session per VNI between two VTEPs
  3. multiple B=
FD sessions per VNI between two VTEPs
The current text reflec=
ts #2. Is WG accepts this scope? If not, which option WG would accept?

Regards,
Greg

On Tue, Oct 22, 201=
9 at 2:09 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
I co=
ncur with Joel's assessment with the following clarifications.

=

The current document is already capable of monitoring multiple V=
NIs between VTEPs.

The issue under discussion was =
how do we use BFD to monitor multiple VAPs that use the same VNI between a =
pair of VTEPs.=C2=A0 The use case for this is not clear to me, as from my u=
nderstanding, we cannot have a situation with multiple VAPs using the same =
VNI--there is 1:1 mapping between VAP and VNI.

Ano=
op

On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> wrote=
:
=C2=A0From wha=
t I can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



_______________________________________________

nvo3 mailing list

nvo3@ietf.org

https://www.ietf.org/mailman/listinfo/nvo3












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In-Reply-To: 
From: Greg Mirsky 
Date: Wed, 23 Oct 2019 11:06:07 -0400
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Santosh P K 
Cc: Dinesh Dutt , Anoop Ghanwani ,  "Joel M. Halpern" , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Dinesh, et al.,
please check the updated version that removed the reference to Hypervisor
in the text and Figure 1.

Regards,
Greg

On Wed, Oct 23, 2019 at 10:47 AM Santosh P K 
wrote:

> Dinesh,
>      Please see my inline comments [SPK]
>
>>
>> - In section 3, there's a sentence that is: "BFD packets intended for a
>> Hypervisor VTEP MUST NOT..". I recommend getting rid of the word
>> "Hypervisor" ashe logic applies to any VTEP.
>>
>> [SPK] Thanks for comments. We will change this.
>
>
>> - You already explained the precedence of the use of 127/8 address in the
>> inner header in MPLS. I have no specific comments in that area. I have only
>> two questions:
>>    - Has anybody verified that the use of 127/8 address (and the right
>> MAC) works with existing implementations, including the silicon ones? If
>> this doesn't work there, is it worth adding the possibilit y of another
>> address, one that is owned by the VTEP node?
>>
>    - Do we know if Firewalls stop such VXLAN packets? I ask this because
>> VXLAN has an IP header and I don't know if firewalls stop packets with
>> 127/8 in the inner header. If not, is it worth adding a sentence to say
>> that firewalls  allow such packets? The use of a non-127/8 address may
>> alleviate this case as well.
>>
>
> [SPK] I think we may need to add the text about firewall as some checks in
> firewall will be there if they are not already using MPLS OAM which has
> inner IP header with 127/8 address range.
>
>
>>
>> The rest of the draft looks good to me,
>>
>> Dinesh
>>
>> On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky 
>> wrote:
>>
>> Hi Dinesh,
>> I greatly appreciate your comments. Please heave a look at the attached
>> copy of the working version and its diff to -07 (latest in the datatracker).
>>
>> Regards,
>> Greg
>>
>> On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:
>>
>>> I have the same feeling as Anoop. Greg, can you please point me to the
>>> latest draft so that I can quickly glance through it to be doubly sure,
>>>
>>> Dinesh
>>>
>>> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani 
>>> wrote:
>>>
>>> Greg,
>>>
>>> I think the draft is fine as is.
>>>
>>> I discussion with Xiao Min was about #3 and I see that as unnecessary
>>> until we have a draft that explains why that is needed in the context of
>>> the NVO3 architecture.
>>>
>>> Anoop
>>>
>>> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
>>> wrote:
>>>
>>>> Hi Anoop, et al.,
>>>> I agree with your understanding of what is being defined in the current
>>>> version of the BFD over VxLAN specification. But, as I understand, the WG
>>>> is discussing the scope before the WGLC is closed. I believe there are
>>>> three options:
>>>>
>>>>    1. single BFD session between two VTEPs
>>>>    2. single BFD session per VNI between two VTEPs
>>>>    3. multiple BFD sessions per VNI between two VTEPs
>>>>
>>>> The current text reflects #2. Is WG accepts this scope? If not, which
>>>> option WG would accept?
>>>>
>>>> Regards,
>>>> Greg
>>>>
>>>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
>>>> wrote:
>>>>
>>>>> I concur with Joel's assessment with the following clarifications.
>>>>>
>>>>> The current document is already capable of monitoring multiple VNIs
>>>>> between VTEPs.
>>>>>
>>>>> The issue under discussion was how do we use BFD to monitor multiple
>>>>> VAPs that use the same VNI between a pair of VTEPs.  The use case for this
>>>>> is not clear to me, as from my understanding, we cannot have a situation
>>>>> with multiple VAPs using the same VNI--there is 1:1 mapping between VAP and
>>>>> VNI.
>>>>>
>>>>> Anoop
>>>>>
>>>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>>>>> wrote:
>>>>>
>>>>>>  From what I can tell, there are two separate problems.
>>>>>> The document we have is a VTEP-VTEP monitoring document.  There is no
>>>>>> need for that document to handle the multiple VNI case.
>>>>>> If folks want a protocol for doing BFD monitoring of things behind
>>>>>> the
>>>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>>>> encoding will be a tenant encoding, and thus sesparate from what is
>>>>>> defined in this document.
>>>>>>
>>>>>> Yours,
>>>>>> Joel
>>>>>>
>>>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>>>> > Santosh and others,
>>>>>> >
>>>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>>>> >>     Thanks for your explanation. This helps a lot. I would wait
>>>>>> for more
>>>>>> >> comments from others to see if this what we need in this draft to
>>>>>> be
>>>>>> >> supported based on that we can provide appropriate sections in the
>>>>>> draft.
>>>>>> >
>>>>>> > The threads on the list have spidered to the point where it is
>>>>>> challenging
>>>>>> > to follow what the current status of the draft is, or should be.
>>>>>> :-)
>>>>>> >
>>>>>> > However, if I've followed things properly, the question below is
>>>>>> really the
>>>>>> > hinge point on what our encapsulation for BFD over vxlan should
>>>>>> look like.
>>>>>> > Correct?
>>>>>> >
>>>>>> > Essentially, do we or do we not require the ability to permit
>>>>>> multiple BFD
>>>>>> > sessions between distinct VAPs?
>>>>>> >
>>>>>> > If this is so, do we have a sense as to how we should proceed?
>>>>>> >
>>>>>> > -- Jeff
>>>>>> >
>>>>>> > [context preserved below...]
>>>>>> >
>>>>>> >> Santosh P K
>>>>>> >>
>>>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>>>> >>
>>>>>> >>> Hi Santosh,
>>>>>> >>>
>>>>>> >>>
>>>>>> >>> With regard to the question whether we should allow multiple BFD
>>>>>> sessions
>>>>>> >>> for the same VNI or not, IMHO we should allow it, more
>>>>>> explanation as
>>>>>> >>> follows.
>>>>>> >>>
>>>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An
>>>>>> Architecture for
>>>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>> >>>
>>>>>> >>>                      |         Data Center Network (IP)        |
>>>>>> >>>                      |                                         |
>>>>>> >>>                      +-----------------------------------------+
>>>>>> >>>                           |                           |
>>>>>> >>>                           |       Tunnel Overlay      |
>>>>>> >>>              +------------+---------+
>>>>>>  +---------+------------+
>>>>>> >>>              | +----------+-------+ |       |
>>>>>> +-------+----------+ |
>>>>>> >>>              | |  Overlay Module  | |       | |  Overlay Module
>>>>>> | |
>>>>>> >>>              | +---------+--------+ |       |
>>>>>> +---------+--------+ |
>>>>>> >>>              |           |          |       |           |
>>>>>>   |
>>>>>> >>>       NVE1   |           |          |       |           |
>>>>>>   | NVE2
>>>>>> >>>              |  +--------+-------+  |       |
>>>>>> +--------+-------+  |
>>>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1
>>>>>> |  |
>>>>>> >>>              |  +-+-----+----+---+  |       |
>>>>>> +-+-----+-----+--+  |
>>>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     |
>>>>>> VAP3|
>>>>>> >>>              +----+-----+----+------+
>>>>>>  +----+-----+-----+-----+
>>>>>> >>>                   |     |    |                   |     |     |
>>>>>> >>>                   |     |    |                   |     |     |
>>>>>> >>>                   |     |    |                   |     |     |
>>>>>> >>>
>>>>>> -------+-----+----+-------------------+-----+-----+-------
>>>>>> >>>                   |     |    |     Tenant        |     |     |
>>>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3
>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|
>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+   +---+
>>>>>> >>>
>>>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>>> actually
>>>>>> >>> initiated and terminated at VAP of NVE.
>>>>>> >>>
>>>>>> >>> If the network operator want to set up one BFD session between
>>>>>> VAP1 of
>>>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session
>>>>>> between VAP3 of
>>>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the
>>>>>> same
>>>>>> >>> VNI1, I believe it's reasonable, so that's why I think we should
>>>>>> allow it
>>>>>>
>>>>>> _______________________________________________
>>>>>> nvo3 mailing list
>>>>>> nvo3@ietf.org
>>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>>
>>>>>

--000000000000649ded059595422e
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Dinesh, et al.,
please check the updated version th=
at removed the reference to Hypervisor in the text and Figure 1.
=

Regards,
Greg

On Wed, Oct 23, 2019 at 10:47 A=
M Santosh P K <santosh.p=
allagatti@gmail.com> wrote:
Dinesh,
=C2=A0 =C2=A0 =
=C2=A0Please see my inline=C2=A0comments [SPK]

- In section 3, there's a sentence that is: "BFD p=
ackets intended for a Hypervisor VTEP MUST NOT..". I recommend getting=
 rid of the word "Hypervisor" ashe logic applies to any VTEP.

[SPK] Thanks for comments. We will=
 change this.=C2=A0
=C2=A0
- You already explained t=
he precedence of the use of 127/8 address in the inner header in MPLS. I ha=
ve no specific comments in that area. I have only two questions:=C2=A0
=C2=A0 =C2=A0- Has anybody verified that the use of 127/8 address (an=
d the right MAC) works with existing implementations, including the silicon=
 ones? If this doesn't work there, is it worth adding the possibilit y =
of another address, one that is owned by the VTEP node?
=C2=A0 =C2=A0- Do we know if Firewalls stop such VXLAN packets? I ask thi=
s because VXLAN has an IP header and I don't know if firewalls stop pac=
kets with 127/8 in the inner header. If not, is it worth adding a sentence =
to say that firewalls =C2=A0allow such packets? The use of a non-127/8 addr=
ess may alleviate this case as well.
=C2=A0
[SPK] I think we may need to add the text about firewall as some ch=
ecks in firewall will be there if they are not already using MPLS OAM which=
 has inner IP header with 127/8 address range.=C2=A0
=C2=A0
=

The rest of the draft looks good to me,

Dinesh=C2=A0

On Wed, Oct 23, 2019 at 7:5=
8 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dinesh,
I greatly appreciate your comments. Please hea=
ve a look at the attached copy of the working version and its diff to -07 (=
latest in the datatracker).

Regards,
Gre=
g

On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt <didutt@gmail.com> wrote:
=

I have the same feeling as Anoop. Greg, can you pl=
ease point me to the latest draft so that I can quickly glance through it t=
o be doubly sure,

Dinesh

On Wed, Oct 23, 2019 at 4:35 AM, Anoop =
Ghanwani <ano=
op@alumni.duke.edu> wrote:
Greg,

I think the draft is fine as is.
I discussion with Xiao Min was about #3 and I see that as unne=
cessary until we have a draft that explains why that is needed in the conte=
xt of the NVO3 architecture.

Anoop

=

On Tue, Oc=
t 22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop, et a=
l.,
I agree with your understanding of what is being defined in the cur=
rent version of the BFD over VxLAN specification. But, as I understand, the=
 WG is discussing the scope before the WGLC is closed. I believe there are =
three options:
  1. single BFD session between two VTEPs
    2. <=
li>single BFD session per VNI between two VTEPs
  2. multiple BFD sessio=
ns per VNI between two VTEPs
The current text reflects #2. Is=
 WG accepts this scope? If not, which option WG would accept?

Regards,
Greg

On Tue, Oct 22, 2019 at 2:09=
 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
I concur with=
 Joel's assessment with the following clarifications.

The current document is already capable of monitoring multiple VNIs betwe=
en VTEPs.

The issue under discussion was how do we=
 use BFD to monitor multiple VAPs that use the same VNI between a pair of V=
TEPs.=C2=A0 The use case for this is not clear to me, as from my understand=
ing, we cannot have a situation with multiple VAPs using the same VNI--ther=
e is 1:1 mapping between VAP and VNI.

Anoop
<=
/div>
O=
n Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
=C2=A0From what I can t=
ell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



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From: Anoop Ghanwani 
Date: Wed, 23 Oct 2019 08:20:59 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: "Joel M. Halpern" 
Cc: Dinesh Dutt , Greg Mirsky ,  draft-ietf-bfd-vxlan@ietf.org, NVO3 ,  Santosh P K , Jeffrey Haas ,  rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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Thanks Joel.

I see the issue.  In the case of IRB, the VTEP will likely have IP
addresses assigned from the tenant space for each VNI.  But if there is no
IRB, then it could be a problem.  Thus far, my assumption had been that the
underlay address would be used and that the inner addresses would be
inconsequential in terms of terminating the BFD messages.  But I can see
now how that would cause problems if the tenant devices are running BFD and
their addresses conflict with the underlay's addresses.

As indicated by Santosh, it looks like there's a precedence with MPLS OAM
using 127/8 so perhaps that is a reasonable solution.  I also think that
setting the TTL to 1 to prevent leakage may not work because the TTL would
not be decremented at the VTEP.  The outer TTL would just be checked, and
the inner TTL would be decremented only if routing.

The language around tenant IP may need to be clarified a bit because the
VTEP may have IP addresses from the tenant space assigned to its interfaces
when it's doing IRB.

Anoop

On Wed, Oct 23, 2019 at 4:49 AM Joel M. Halpern  wrote:

> Anoop, you refer to "the destination VTEP's IP address".  Since this is
> a field inside the Ethernet header inside the VxLAN header, what VTEP
> assigned IP address?  The customer (whose address space this is in may
> not be using IP.  Or may be using IP and presumably has NOT assigned an
> IP address to the VTEP.
>
> If we were using VNI 0, then wew would be free to use whatever IP
> address we wanted, as there would be no tenant.  Since folks seem to
> want to use option #2, something has to go in the IP dest address.
> Since there is no IP assigned to the VTEP within the VNI being tested,
> we have to specify something.
>
> Yours,
> Joel
>
> On 10/23/2019 2:09 AM, Anoop Ghanwani wrote:
> > Hi Greg,
> >
> > The part about the use of 127/8 address appears to be a new thing
> > introduced in the version of the draft that is as of yet unpublished.
> > What was the motivation for the change?  Previously, the DA was simply
> > set to the destination VTEP's IP address which seemed fine.
> >
> > Anoop
> >
> > On Tue, Oct 22, 2019 at 7:48 PM Dinesh Dutt  > > wrote:
> >
> >     Greg,
> >
> >     Two comments, one minor and one maybe not.
> >
> >     - In section 3, there's a sentence that is: "BFD packets intended
> >     for a Hypervisor VTEP MUST NOT..". I recommend getting rid of the
> >     word "Hypervisor" ashe logic applies to any VTEP.
> >
> >     - You already explained the precedence of the use of 127/8 address
> >     in the inner header in MPLS. I have no specific comments in that
> >     area. I have only two questions:
> >         - Has anybody verified that the use of 127/8 address (and the
> >     right MAC) works with existing implementations, including the
> >     silicon ones? If this doesn't work there, is it worth adding the
> >     possibilit y of another address, one that is owned by the VTEP node?
> >         - Do we know if Firewalls stop such VXLAN packets? I ask this
> >     because VXLAN has an IP header and I don't know if firewalls stop
> >     packets with 127/8 in the inner header. If not, is it worth adding a
> >     sentence to say that firewalls  allow such packets? The use of a
> >     non-127/8 address may alleviate this case as well.
> >
> >     The rest of the draft looks good to me,
> >
> >     Dinesh
> >
> >     On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky  >     > wrote:
> >>     Hi Dinesh,
> >>     I greatly appreciate your comments. Please heave a look at the
> >>     attached copy of the working version and its diff to -07 (latest
> >>     in the datatracker).
> >>
> >>     Regards,
> >>     Greg
> >>
> >>     On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  >>     > wrote:
> >>
> >>         I have the same feeling as Anoop. Greg, can you please point
> >>         me to the latest draft so that I can quickly glance through it
> >>         to be doubly sure,
> >>
> >>         Dinesh
> >>
> >>         On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani
> >>         > wrote:
> >>>         Greg,
> >>>
> >>>         I think the draft is fine as is.
> >>>
> >>>         I discussion with Xiao Min was about #3 and I see that as
> >>>         unnecessary until we have a draft that explains why that is
> >>>         needed in the context of the NVO3 architecture.
> >>>
> >>>         Anoop
> >>>
> >>>         On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky
> >>>         > wrote:
> >>>
> >>>             Hi Anoop, et al.,
> >>>             I agree with your understanding of what is being defined
> >>>             in the current version of the BFD over VxLAN
> >>>             specification. But, as I understand, the WG is discussing
> >>>             the scope before the WGLC is closed. I believe there are
> >>>             three options:
> >>>
> >>>              1. single BFD session between two VTEPs
> >>>              2. single BFD session per VNI between two VTEPs
> >>>              3. multiple BFD sessions per VNI between two VTEPs
> >>>
> >>>             The current text reflects #2. Is WG accepts this scope?
> >>>             If not, which option WG would accept?
> >>>
> >>>             Regards,
> >>>             Greg
> >>>
> >>>             On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani
> >>>             >
> wrote:
> >>>
> >>>                 I concur with Joel's assessment with the following
> >>>                 clarifications.
> >>>
> >>>                 The current document is already capable of monitoring
> >>>                 multiple VNIs between VTEPs.
> >>>
> >>>                 The issue under discussion was how do we use BFD to
> >>>                 monitor multiple VAPs that use the same VNI between a
> >>>                 pair of VTEPs.  The use case for this is not clear to
> >>>                 me, as from my understanding, we cannot have a
> >>>                 situation with multiple VAPs using the same
> >>>                 VNI--there is 1:1 mapping between VAP and VNI.
> >>>
> >>>                 Anoop
> >>>
> >>>                 On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern
> >>>                 >
> wrote:
> >>>
> >>>                      From what I can tell, there are two separate
> >>>                     problems.
> >>>                     The document we have is a VTEP-VTEP monitoring
> >>>                     document.  There is no
> >>>                     need for that document to handle the multiple VNI
> >>>                     case.
> >>>                     If folks want a protocol for doing BFD monitoring
> >>>                     of things behind the
> >>>                     VTEPs (multiple VNIs), then do that as a separate
> >>>                     document.   The
> >>>                     encoding will be a tenant encoding, and thus
> >>>                     sesparate from what is
> >>>                     defined in this document.
> >>>
> >>>                     Yours,
> >>>                     Joel
> >>>
> >>>                     On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
> >>>                     > Santosh and others,
> >>>                     >
> >>>                     > On Thu, Oct 03, 2019 at 07:50:20PM +0530,
> >>>                     Santosh P K wrote:
> >>>                     >>     Thanks for your explanation. This helps a
> >>>                     lot. I would wait for more
> >>>                     >> comments from others to see if this what we
> >>>                     need in this draft to be
> >>>                     >> supported based on that we can provide
> >>>                     appropriate sections in the draft.
> >>>                     >
> >>>                     > The threads on the list have spidered to the
> >>>                     point where it is challenging
> >>>                     > to follow what the current status of the draft
> >>>                     is, or should be.  :-)
> >>>                     >
> >>>                     > However, if I've followed things properly, the
> >>>                     question below is really the
> >>>                     > hinge point on what our encapsulation for BFD
> >>>                     over vxlan should look like.
> >>>                     > Correct?
> >>>                     >
> >>>                     > Essentially, do we or do we not require the
> >>>                     ability to permit multiple BFD
> >>>                     > sessions between distinct VAPs?
> >>>                     >
> >>>                     > If this is so, do we have a sense as to how we
> >>>                     should proceed?
> >>>                     >
> >>>                     > -- Jeff
> >>>                     >
> >>>                     > [context preserved below...]
> >>>                     >
> >>>                     >> Santosh P K
> >>>                     >>
> >>>                     >> On Wed, Sep 25, 2019 at 8:10 AM
> >>>                      >>>                     > wrote:
> >>>                     >>
> >>>                     >>> Hi Santosh,
> >>>                     >>>
> >>>                     >>>
> >>>                     >>> With regard to the question whether we should
> >>>                     allow multiple BFD sessions
> >>>                     >>> for the same VNI or not, IMHO we should allow
> >>>                     it, more explanation as
> >>>                     >>> follows.
> >>>                     >>>
> >>>                     >>> Below is a figure derived from figure 2 of
> >>>                     RFC8014 (An Architecture for
> >>>                     >>> Data-Center Network Virtualization over Layer
> >>>                     3 (NVO3)).
> >>>                     >>>
> >>>                     >>>                      |         Data Center
> >>>                     Network (IP)        |
> >>>                     >>>                      |
> >>>                                      |
> >>>                     >>>
> >>>                     +-----------------------------------------+
> >>>                     >>>                           |
> >>>                              |
> >>>                     >>>                           |       Tunnel
> >>>                     Overlay      |
> >>>                     >>>              +------------+---------+
> >>>                      +---------+------------+
> >>>                     >>>              | +----------+-------+ |       |
> >>>                     +-------+----------+ |
> >>>                     >>>              | |  Overlay Module  | |       |
> >>>                     |  Overlay Module  | |
> >>>                     >>>              | +---------+--------+ |       |
> >>>                     +---------+--------+ |
> >>>                     >>>              |           |          |
> >>>                      |           |          |
> >>>                     >>>       NVE1   |           |          |
> >>>                      |           |          | NVE2
> >>>                     >>>              |  +--------+-------+  |
> >>>                      |  +--------+-------+  |
> >>>                     >>>              |  |VNI1 VNI2  VNI1 |  |
> >>>                      |  | VNI1 VNI2 VNI1 |  |
> >>>                     >>>              |  +-+-----+----+---+  |
> >>>                      |  +-+-----+-----+--+  |
> >>>                     >>>              |VAP1| VAP2|    | VAP3 |
> >>>                      |VAP1| VAP2|     | VAP3|
> >>>                     >>>              +----+-----+----+------+
> >>>                      +----+-----+-----+-----+
> >>>                     >>>                   |     |    |
> >>>                        |     |     |
> >>>                     >>>                   |     |    |
> >>>                        |     |     |
> >>>                     >>>                   |     |    |
> >>>                        |     |     |
> >>>                     >>>
> >>>
>  -------+-----+----+-------------------+-----+-----+-------
> >>>                     >>>                   |     |    |     Tenant
> >>>                         |     |     |
> >>>                     >>>              TSI1 | TSI2|    | TSI3
> >>>                     TSI1| TSI2|     |TSI3
> >>>                     >>>                  +---+ +---+ +---+
> >>>                      +---+ +---+   +---+
> >>>                     >>>                  |TS1| |TS2| |TS3|
> >>>                      |TS4| |TS5|   |TS6|
> >>>                     >>>                  +---+ +---+ +---+
> >>>                      +---+ +---+   +---+
> >>>                     >>>
> >>>                     >>> To my understanding, the BFD sessions between
> >>>                     NVE1 and NVE2 are actually
> >>>                     >>> initiated and terminated at VAP of NVE.
> >>>                     >>>
> >>>                     >>> If the network operator want to set up one
> >>>                     BFD session between VAP1 of
> >>>                     >>> NVE1 and VAP1of NVE2, at the same time
> >>>                     another BFD session between VAP3 of
> >>>                     >>> NVE1 and VAP3 of NVE2, although the two BFD
> >>>                     sessions are for the same
> >>>                     >>> VNI1, I believe it's reasonable, so that's
> >>>                     why I think we should allow it
> >>>
> >>>                     _______________________________________________
> >>>                     nvo3 mailing list
> >>>                     nvo3@ietf.org 
> >>>                     https://www.ietf.org/mailman/listinfo/nvo3
> >>>
> >
> > _______________________________________________
> > nvo3 mailing list
> > nvo3@ietf.org
> > https://www.ietf.org/mailman/listinfo/nvo3
> >
>

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Date: Thu, 24 Oct 2019 00:54:30 +0500
From: Dinesh Dutt 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Greg Mirsky 
Cc: Santosh P K , Anoop Ghanwani , "Joel M. Halpern" , Jeffrey Haas , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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Looks good to me Greg. I see that the text around the use of the inner 
IP address as also quite acceptable. Will you add any words about the 
firewall?

Dinesh

On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky  
wrote:
> Hi Dinesh, et al.,
> please check the updated version that removed the reference to 
> Hypervisor in the text and Figure 1.
> 
> Regards,
> Greg
> 
> On Wed, Oct 23, 2019 at 10:47 AM Santosh P K 
>  wrote:
>> Dinesh,
>>      Please see my inline comments [SPK]
>>> 
>>> - In section 3, there's a sentence that is: "BFD packets intended 
>>> for a Hypervisor VTEP MUST NOT..". I recommend getting rid of the 
>>> word "Hypervisor" ashe logic applies to any VTEP.
>>> 
>> [SPK] Thanks for comments. We will change this.
>> 
>>> - You already explained the precedence of the use of 127/8 address 
>>> in the inner header in MPLS. I have no specific comments in that 
>>> area. I have only two questions:
>>>    - Has anybody verified that the use of 127/8 address (and the 
>>> right MAC) works with existing implementations, including the 
>>> silicon ones? If this doesn't work there, is it worth adding the 
>>> possibilit y of another address, one that is owned by the VTEP node?
>>>    - Do we know if Firewalls stop such VXLAN packets? I ask this 
>>> because VXLAN has an IP header and I don't know if firewalls stop 
>>> packets with 127/8 in the inner header. If not, is it worth adding 
>>> a sentence to say that firewalls  allow such packets? The use of a 
>>> non-127/8 address may alleviate this case as well.
>> 
>> [SPK] I think we may need to add the text about firewall as some 
>> checks in firewall will be there if they are not already using MPLS 
>> OAM which has inner IP header with 127/8 address range.
>> 
>>> 
>>> The rest of the draft looks good to me,
>>> 
>>> Dinesh
>>> 
>>> On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky 
>>>  wrote:
>>>> Hi Dinesh,
>>>> I greatly appreciate your comments. Please heave a look at the 
>>>> attached copy of the working version and its diff to -07 (latest 
>>>> in the datatracker).
>>>> 
>>>> Regards,
>>>> Greg
>>>> 
>>>> On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  
>>>> wrote:
>>>>> I have the same feeling as Anoop. Greg, can you please point me 
>>>>> to the latest draft so that I can quickly glance through it to be 
>>>>> doubly sure,
>>>>> 
>>>>> Dinesh
>>>>> 
>>>>> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani 
>>>>>  wrote:
>>>>>> Greg,
>>>>>> 
>>>>>> I think the draft is fine as is.
>>>>>> 
>>>>>> I discussion with Xiao Min was about #3 and I see that as 
>>>>>> unnecessary until we have a draft that explains why that is 
>>>>>> needed in the context of the NVO3 architecture.
>>>>>> 
>>>>>> Anoop
>>>>>> 
>>>>>> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
>>>>>>  wrote:
>>>>>>> Hi Anoop, et al.,
>>>>>>> I agree with your understanding of what is being defined in the 
>>>>>>> current version of the BFD over VxLAN specification. But, as I 
>>>>>>> understand, the WG is discussing the scope before the WGLC is 
>>>>>>> closed. I believe there are three options:
>>>>>>> single BFD session between two VTEPs
>>>>>>> single BFD session per VNI between two VTEPs
>>>>>>> multiple BFD sessions per VNI between two VTEPs
>>>>>>> The current text reflects #2. Is WG accepts this scope? If not, 
>>>>>>> which option WG would accept?
>>>>>>> 
>>>>>>> Regards,
>>>>>>> Greg
>>>>>>> 
>>>>>>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
>>>>>>>  wrote:
>>>>>>>> I concur with Joel's assessment with the following 
>>>>>>>> clarifications.
>>>>>>>> 
>>>>>>>> The current document is already capable of monitoring multiple 
>>>>>>>> VNIs between VTEPs.
>>>>>>>> 
>>>>>>>> The issue under discussion was how do we use BFD to monitor 
>>>>>>>> multiple VAPs that use the same VNI between a pair of VTEPs.  
>>>>>>>> The use case for this is not clear to me, as from my 
>>>>>>>> understanding, we cannot have a situation with multiple VAPs 
>>>>>>>> using the same VNI--there is 1:1 mapping between VAP and VNI.
>>>>>>>> 
>>>>>>>> Anoop
>>>>>>>> 
>>>>>>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>>>>>>>>  wrote:
>>>>>>>>>  From what I can tell, there are two separate problems.
>>>>>>>>> The document we have is a VTEP-VTEP monitoring document.  
>>>>>>>>> There is no
>>>>>>>>> need for that document to handle the multiple VNI case.
>>>>>>>>> If folks want a protocol for doing BFD monitoring of things 
>>>>>>>>> behind the
>>>>>>>>> VTEPs (multiple VNIs), then do that as a separate document.   
>>>>>>>>> The
>>>>>>>>> encoding will be a tenant encoding, and thus sesparate from 
>>>>>>>>> what is
>>>>>>>>> defined in this document.
>>>>>>>>> 
>>>>>>>>> Yours,
>>>>>>>>> Joel
>>>>>>>>> 
>>>>>>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>>>>>>> > Santosh and others,
>>>>>>>>> >
>>>>>>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>>>>>>> >>     Thanks for your explanation. This helps a lot. I would 
>>>>>>>>> wait for more
>>>>>>>>> >> comments from others to see if this what we need in this 
>>>>>>>>> draft to be
>>>>>>>>> >> supported based on that we can provide appropriate 
>>>>>>>>> sections in the draft.
>>>>>>>>> >
>>>>>>>>> > The threads on the list have spidered to the point where it 
>>>>>>>>> is challenging
>>>>>>>>> > to follow what the current status of the draft is, or 
>>>>>>>>> should be.  :-)
>>>>>>>>> >
>>>>>>>>> > However, if I've followed things properly, the question 
>>>>>>>>> below is really the
>>>>>>>>> > hinge point on what our encapsulation for BFD over vxlan 
>>>>>>>>> should look like.
>>>>>>>>> > Correct?
>>>>>>>>> >
>>>>>>>>> > Essentially, do we or do we not require the ability to 
>>>>>>>>> permit multiple BFD
>>>>>>>>> > sessions between distinct VAPs?
>>>>>>>>> >
>>>>>>>>> > If this is so, do we have a sense as to how we should 
>>>>>>>>> proceed?
>>>>>>>>> >
>>>>>>>>> > -- Jeff
>>>>>>>>> >
>>>>>>>>> > [context preserved below...]
>>>>>>>>> >
>>>>>>>>> >> Santosh P K
>>>>>>>>> >>
>>>>>>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  
>>>>>>>>> wrote:
>>>>>>>>> >>
>>>>>>>>> >>> Hi Santosh,
>>>>>>>>> >>>
>>>>>>>>> >>>
>>>>>>>>> >>> With regard to the question whether we should allow 
>>>>>>>>> multiple BFD sessions
>>>>>>>>> >>> for the same VNI or not, IMHO we should allow it, more 
>>>>>>>>> explanation as
>>>>>>>>> >>> follows.
>>>>>>>>> >>>
>>>>>>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An 
>>>>>>>>> Architecture for
>>>>>>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>>>>> >>>
>>>>>>>>> >>>                      |         Data Center Network (IP)   
>>>>>>>>>      |
>>>>>>>>> >>>                      |                                    
>>>>>>>>>      |
>>>>>>>>> >>>                      
>>>>>>>>> +-----------------------------------------+
>>>>>>>>> >>>                           |                           |
>>>>>>>>> >>>                           |       Tunnel Overlay      |
>>>>>>>>> >>>              +------------+---------+       
>>>>>>>>> +---------+------------+
>>>>>>>>> >>>              | +----------+-------+ |       | 
>>>>>>>>> +-------+----------+ |
>>>>>>>>> >>>              | |  Overlay Module  | |       | |  Overlay 
>>>>>>>>> Module  | |
>>>>>>>>> >>>              | +---------+--------+ |       | 
>>>>>>>>> +---------+--------+ |
>>>>>>>>> >>>              |           |          |       |           | 
>>>>>>>>>          |
>>>>>>>>> >>>       NVE1   |           |          |       |           | 
>>>>>>>>>          | NVE2
>>>>>>>>> >>>              |  +--------+-------+  |       |  
>>>>>>>>> +--------+-------+  |
>>>>>>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 
>>>>>>>>> VNI2 VNI1 |  |
>>>>>>>>> >>>              |  +-+-----+----+---+  |       |  
>>>>>>>>> +-+-----+-----+--+  |
>>>>>>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|  
>>>>>>>>>    | VAP3|
>>>>>>>>> >>>              +----+-----+----+------+       
>>>>>>>>> +----+-----+-----+-----+
>>>>>>>>> >>>                   |     |    |                   |     |  
>>>>>>>>>    |
>>>>>>>>> >>>                   |     |    |                   |     |  
>>>>>>>>>    |
>>>>>>>>> >>>                   |     |    |                   |     |  
>>>>>>>>>    |
>>>>>>>>> >>>            
>>>>>>>>> -------+-----+----+-------------------+-----+-----+-------
>>>>>>>>> >>>                   |     |    |     Tenant        |     |  
>>>>>>>>>    |
>>>>>>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|  
>>>>>>>>>    |TSI3
>>>>>>>>> >>>                  +---+ +---+ +---+             +---+ 
>>>>>>>>> +---+   +---+
>>>>>>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| 
>>>>>>>>> |TS5|   |TS6|
>>>>>>>>> >>>                  +---+ +---+ +---+             +---+ 
>>>>>>>>> +---+   +---+
>>>>>>>>> >>>
>>>>>>>>> >>> To my understanding, the BFD sessions between NVE1 and 
>>>>>>>>> NVE2 are actually
>>>>>>>>> >>> initiated and terminated at VAP of NVE.
>>>>>>>>> >>>
>>>>>>>>> >>> If the network operator want to set up one BFD session 
>>>>>>>>> between VAP1 of
>>>>>>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD 
>>>>>>>>> session between VAP3 of
>>>>>>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are 
>>>>>>>>> for the same
>>>>>>>>> >>> VNI1, I believe it's reasonable, so that's why I think we 
>>>>>>>>> should allow it
>>>>>>>>> 
>>>>>>>>> _______________________________________________
>>>>>>>>> nvo3 mailing list
>>>>>>>>> nvo3@ietf.org
>>>>>>>>> https://www.ietf.org/mailman/listinfo/nvo3

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Looks good to me Greg. I see that the text around the use of the inner IP address as also quite acceptable. Will you add any words about the firewall?

Dinesh

On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dinesh, et al.,
please check the updated version that removed the reference to Hypervisor in the text and Figure 1.

Regards,
Greg

On Wed, Oct 23, 2019 at 10:47 AM Santosh P K <santosh.pallagatti@gmail.com> wrote:
Dinesh,
     Please see my inline comment
 s [SPK]

- In section 3, there's a sentence that is: "BFD packets intended for a Hypervisor VTEP MUST NOT..". I recommend getting rid of the word "Hypervisor" ashe logic applies to any VTEP.

[SPK] Thanks for comments. We will change this. 
 
- You already explained the precedence of the use of 127/8 address in the inner header in MPLS. I have no specific comments in that area. I have only two questions: 
   - Has any
 body verified that the use of 127/8 address (and the right MAC) works with existing implementations, including the silicon ones? If this doesn't work there, is it worth adding the possibilit y of another address, one that is owned by the VTEP node?
   - Do we know if Firewalls stop such VXLAN packets? I ask this because VXLAN has an IP header and I don't know if firewalls stop packets with 127/8 in the inner header. If not, is it worth adding a sentence to say that firewalls  allow such packets? The use of a non-127/8 address may alleviate this case as well.
 
[SPK] I think we may need to add the text about firewall as some checks in firewall will be there if they are not already using MPLS 
 OAM which has inner IP header with 127/8 address range. 
 

The rest of the draft looks good to me,

Dinesh 

On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dinesh,
I greatly appreciate your comments. Please heave a look at the attached copy of the working version and its diff to -07 (latest in the datatracker).

Regards,
Greg

On Tue, Oct 22, 2019 at 9:52 PM 
 Dinesh Dutt <didutt@gmail.com> wrote:
I have the same feeling as Anoop. Greg, can you please point me to the latest draft so that I can quickly glance through it to be doubly sure,

Dinesh

On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Greg,

I think the draft is fine as is.

I discussion with Xiao Min was about #3 and I see that as unnecessary un
 til we have a draft that explains why that is needed in the context of the NVO3 architecture.

Anoop

On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop, et al.,
I agree with your understanding of what is being defined in the current version of the BFD over VxLAN specification. But, as I understand, the WG is discussing the scope before the WGLC is closed. I believe there are three options:
  1. single BFD session between two VTEPs
  2. single BFD session per VNI between two VTEPs
  3. multiple BFD sessions per VNI between two VTEPs
The current text reflects #2. Is WG accepts this scope? If not, which option WG 
 would accept?

Regards,
Greg

On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
I concur with Joel's assessment with the following clarifications.

The current document is already capable of monitoring multiple VNIs between VTEPs.

The issue under discussion was how do we use BFD to monitor multiple VAPs that use the same VNI between a pair of VTEPs.  The use case for this is not clear to me, as from my understanding, we cannot have a situation with multiple VAPs using the same VNI--there is 1:1 mapping between VAP and VNI.

Anoop

On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
 From what I can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.  There is no 

need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.   The 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>     Thanks for your explanation. This helps a lot. I would wait for more

>> comments from others to see if this what we need in this draft to be

>> supported based on that we can provide appropriate sections in the draft.

> 

> The threads on the list have spidered to the point where it is challenging

> to follow what the current status of the draft is, or should be.  :-)

> 

> However, if I've followed things properly, the question below is really the

> hinge point on what our encapsulation for BFD over vxlan should look like.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple BFD sessions

>>> for the same VNI or not, IMHO we should allow it, more explanation as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Architecture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>                      |         Data Center Network (IP)        |

>>>                      |                                         |

>>>                      +-----------------------------------------+

>>>                           |                           |

>>>                           |       Tunnel Overlay      |

>>>              +------------+---------+       +---------+------------+

>>>              | +----------+-------+ |       | +-------+----------+ |

>>>              | |  Overlay Module  | |       | |  Overlay Module  | |

>>>              | +---------+--------+ |       | +---------+--------+ |

>>>              |           |          |       |           |          |

>>>       NVE1   |           |          |       |           |          | NVE2

>>>              |  +--------+-------+  |       |  +--------+-------+  |

>>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1 |  |

>>>              |  +-+-----+----+---+  |       |  +-+-----+-----+--+  |

>>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     | VAP3|

>>>              +----+-----+----+------+       +----+-----+-----+-----+

>>>                   |     |    |                   |     |     |

>>>                   |     |    |                   |     |     |

>>>                   |     |    |                   |     |     |

>>>            -------+-----+----+-------------------+-----+-----+-------

>>>                   |     |    |     Tenant        |     |     |

>>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|     |TSI3

>>>                  +---+ +---+ +---+             +---+ +---+   +---+

>>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|   |TS6|

>>>                  +---+ +---+ +---+             +---+ +---+   +---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 are actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session between VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the same

>>> VNI1, I believe it's reasonable, so that's why I think we should allow it



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From: Greg Mirsky 
Date: Wed, 23 Oct 2019 16:03:04 -0400
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Dinesh Dutt 
Cc: Santosh P K , Anoop Ghanwani ,  "Joel M. Halpern" , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Dinesh,
many thanks for your time, the expertise you've kindly shared on this
discussion.
I believe that Santosh has volunteered ;) to provide some text on the
firewall interaction. Any other contributions are welcome and greatly
appreciated.

Regards,
Greg

On Wed, Oct 23, 2019 at 3:54 PM Dinesh Dutt  wrote:

> Looks good to me Greg. I see that the text around the use of the inner IP
> address as also quite acceptable. Will you add any words about the firewall?
>
> Dinesh
>
> On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky 
> wrote:
>
> Hi Dinesh, et al.,
> please check the updated version that removed the reference to Hypervisor
> in the text and Figure 1.
>
> Regards,
> Greg
>
> On Wed, Oct 23, 2019 at 10:47 AM Santosh P K 
> wrote:
>
>> Dinesh,
>>      Please see my inline comments [SPK]
>>
>>>
>>> - In section 3, there's a sentence that is: "BFD packets intended for a
>>> Hypervisor VTEP MUST NOT..". I recommend getting rid of the word
>>> "Hypervisor" ashe logic applies to any VTEP.
>>>
>>> [SPK] Thanks for comments. We will change this.
>>
>>
>>> - You already explained the precedence of the use of 127/8 address in
>>> the inner header in MPLS. I have no specific comments in that area. I have
>>> only two questions:
>>>    - Has anybody verified that the use of 127/8 address (and the right
>>> MAC) works with existing implementations, including the silicon ones? If
>>> this doesn't work there, is it worth adding the possibilit y of another
>>> address, one that is owned by the VTEP node?
>>>
>>    - Do we know if Firewalls stop such VXLAN packets? I ask this because
>>> VXLAN has an IP header and I don't know if firewalls stop packets with
>>> 127/8 in the inner header. If not, is it worth adding a sentence to say
>>> that firewalls  allow such packets? The use of a non-127/8 address may
>>> alleviate this case as well.
>>>
>>
>> [SPK] I think we may need to add the text about firewall as some checks
>> in firewall will be there if they are not already using MPLS OAM which has
>> inner IP header with 127/8 address range.
>>
>>
>>>
>>> The rest of the draft looks good to me,
>>>
>>> Dinesh
>>>
>>> On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky 
>>> wrote:
>>>
>>> Hi Dinesh,
>>> I greatly appreciate your comments. Please heave a look at the attached
>>> copy of the working version and its diff to -07 (latest in the datatracker).
>>>
>>> Regards,
>>> Greg
>>>
>>> On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:
>>>
>>>> I have the same feeling as Anoop. Greg, can you please point me to the
>>>> latest draft so that I can quickly glance through it to be doubly sure,
>>>>
>>>> Dinesh
>>>>
>>>> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani 
>>>> wrote:
>>>>
>>>> Greg,
>>>>
>>>> I think the draft is fine as is.
>>>>
>>>> I discussion with Xiao Min was about #3 and I see that as unnecessary
>>>> until we have a draft that explains why that is needed in the context of
>>>> the NVO3 architecture.
>>>>
>>>> Anoop
>>>>
>>>> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
>>>> wrote:
>>>>
>>>>> Hi Anoop, et al.,
>>>>> I agree with your understanding of what is being defined in the
>>>>> current version of the BFD over VxLAN specification. But, as I understand,
>>>>> the WG is discussing the scope before the WGLC is closed. I believe there
>>>>> are three options:
>>>>>
>>>>>    1. single BFD session between two VTEPs
>>>>>    2. single BFD session per VNI between two VTEPs
>>>>>    3. multiple BFD sessions per VNI between two VTEPs
>>>>>
>>>>> The current text reflects #2. Is WG accepts this scope? If not, which
>>>>> option WG would accept?
>>>>>
>>>>> Regards,
>>>>> Greg
>>>>>
>>>>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
>>>>> wrote:
>>>>>
>>>>>> I concur with Joel's assessment with the following clarifications.
>>>>>>
>>>>>> The current document is already capable of monitoring multiple VNIs
>>>>>> between VTEPs.
>>>>>>
>>>>>> The issue under discussion was how do we use BFD to monitor multiple
>>>>>> VAPs that use the same VNI between a pair of VTEPs.  The use case for this
>>>>>> is not clear to me, as from my understanding, we cannot have a situation
>>>>>> with multiple VAPs using the same VNI--there is 1:1 mapping between VAP and
>>>>>> VNI.
>>>>>>
>>>>>> Anoop
>>>>>>
>>>>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>>>>>> wrote:
>>>>>>
>>>>>>>  From what I can tell, there are two separate problems.
>>>>>>> The document we have is a VTEP-VTEP monitoring document.  There is
>>>>>>> no
>>>>>>> need for that document to handle the multiple VNI case.
>>>>>>> If folks want a protocol for doing BFD monitoring of things behind
>>>>>>> the
>>>>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>>>>> encoding will be a tenant encoding, and thus sesparate from what is
>>>>>>> defined in this document.
>>>>>>>
>>>>>>> Yours,
>>>>>>> Joel
>>>>>>>
>>>>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>>>>> > Santosh and others,
>>>>>>> >
>>>>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>>>>> >>     Thanks for your explanation. This helps a lot. I would wait
>>>>>>> for more
>>>>>>> >> comments from others to see if this what we need in this draft to
>>>>>>> be
>>>>>>> >> supported based on that we can provide appropriate sections in
>>>>>>> the draft.
>>>>>>> >
>>>>>>> > The threads on the list have spidered to the point where it is
>>>>>>> challenging
>>>>>>> > to follow what the current status of the draft is, or should be.
>>>>>>> :-)
>>>>>>> >
>>>>>>> > However, if I've followed things properly, the question below is
>>>>>>> really the
>>>>>>> > hinge point on what our encapsulation for BFD over vxlan should
>>>>>>> look like.
>>>>>>> > Correct?
>>>>>>> >
>>>>>>> > Essentially, do we or do we not require the ability to permit
>>>>>>> multiple BFD
>>>>>>> > sessions between distinct VAPs?
>>>>>>> >
>>>>>>> > If this is so, do we have a sense as to how we should proceed?
>>>>>>> >
>>>>>>> > -- Jeff
>>>>>>> >
>>>>>>> > [context preserved below...]
>>>>>>> >
>>>>>>> >> Santosh P K
>>>>>>> >>
>>>>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>>>>> >>
>>>>>>> >>> Hi Santosh,
>>>>>>> >>>
>>>>>>> >>>
>>>>>>> >>> With regard to the question whether we should allow multiple BFD
>>>>>>> sessions
>>>>>>> >>> for the same VNI or not, IMHO we should allow it, more
>>>>>>> explanation as
>>>>>>> >>> follows.
>>>>>>> >>>
>>>>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An
>>>>>>> Architecture for
>>>>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>>> >>>
>>>>>>> >>>                      |         Data Center Network (IP)        |
>>>>>>> >>>                      |                                         |
>>>>>>> >>>                      +-----------------------------------------+
>>>>>>> >>>                           |                           |
>>>>>>> >>>                           |       Tunnel Overlay      |
>>>>>>> >>>              +------------+---------+
>>>>>>>  +---------+------------+
>>>>>>> >>>              | +----------+-------+ |       |
>>>>>>> +-------+----------+ |
>>>>>>> >>>              | |  Overlay Module  | |       | |  Overlay Module
>>>>>>> | |
>>>>>>> >>>              | +---------+--------+ |       |
>>>>>>> +---------+--------+ |
>>>>>>> >>>              |           |          |       |           |
>>>>>>>   |
>>>>>>> >>>       NVE1   |           |          |       |           |
>>>>>>>   | NVE2
>>>>>>> >>>              |  +--------+-------+  |       |
>>>>>>> +--------+-------+  |
>>>>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1
>>>>>>> |  |
>>>>>>> >>>              |  +-+-----+----+---+  |       |
>>>>>>> +-+-----+-----+--+  |
>>>>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     |
>>>>>>> VAP3|
>>>>>>> >>>              +----+-----+----+------+
>>>>>>>  +----+-----+-----+-----+
>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>> >>>
>>>>>>> -------+-----+----+-------------------+-----+-----+-------
>>>>>>> >>>                   |     |    |     Tenant        |     |     |
>>>>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|
>>>>>>>  |TSI3
>>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+
>>>>>>>  +---+
>>>>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|
>>>>>>>  |TS6|
>>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+
>>>>>>>  +---+
>>>>>>> >>>
>>>>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>>>> actually
>>>>>>> >>> initiated and terminated at VAP of NVE.
>>>>>>> >>>
>>>>>>> >>> If the network operator want to set up one BFD session between
>>>>>>> VAP1 of
>>>>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session
>>>>>>> between VAP3 of
>>>>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the
>>>>>>> same
>>>>>>> >>> VNI1, I believe it's reasonable, so that's why I think we should
>>>>>>> allow it
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> nvo3 mailing list
>>>>>>> nvo3@ietf.org
>>>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>>>
>>>>>>

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Content-Type: text/html; charset="UTF-8"
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Hi Dinesh,
many thanks for your time, the expertise yo=
u've kindly shared on this discussion.
I believe that Santosh=
 has volunteered ;) to provide some text on the firewall interaction. Any o=
ther contributions are welcome and greatly appreciated.

Regards,
Greg=C2=A0

On Wed, Oct 23, 2019 at 3:54 PM Di=
nesh Dutt <didutt@gmail.com> =
wrote:
Looks good to =
me Greg. I see that the text around the use of the inner IP address as also=
 quite acceptable. Will you add any words about the firewall?
Dinesh

On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky <gregimirsky@gmail.c=
om> wrote:
Hi Dinesh, =
et al.,
please check the updated version that removed the reference to =
Hypervisor in the text and Figure 1.

Regards,
Greg

On Wed, Oct 23, 2019 at 10:47 AM Santosh P K <santosh.pallagatti@=
gmail.com> wrote:
Dinesh,
=C2=A0 =C2=A0 =C2=A0Plea=
se see my inline=C2=A0comments [SPK]

- In section 3, there's a sentence tha=
t is: "BFD packets intended for a Hypervisor VTEP MUST NOT..". I =
recommend getting rid of the word "Hypervisor" ashe logic applies=
 to any VTEP.

[SPK] Thanks for =
comments. We will change this.=C2=A0
=C2=A0
- You already explained the precedence of the use of 127=
/8 address in the inner header in MPLS. I have no specific comments in that=
 area. I have only two questions:=C2=A0
=C2=A0 =C2=A0- Has anybod=
y verified that the use of 127/8 address (and the right MAC) works with exi=
sting implementations, including the silicon ones? If this doesn't work=
 there, is it worth adding the possibilit y of another address, one that is=
 owned by the VTEP node?
=
=C2=A0 =C2=A0- Do we know if Firewalls stop such VXLAN packets? I ask this =
because VXLAN has an IP header and I don't know if firewalls stop packe=
ts with 127/8 in the inner header. If not, is it worth adding a sentence to=
 say that firewalls =C2=A0allow such packets? The use of a non-127/8 addres=
s may alleviate this case as well.
=C2=A0
[SPK] I think we may need to add the text about firewall as some chec=
ks in firewall will be there if they are not already using MPLS OAM which h=
as inner IP header with 127/8 address range.=C2=A0
=C2=A0

The rest of the draft looks good to me=
,

Dinesh=C2=A0

On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky <<=
a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail=
.com> wrote:
Hi Dinesh=
,
I greatly appreciate your comments. Please heave a look at the attach=
ed copy of the working version and its diff to -07 (latest in the datatrack=
er).

Regards,
Greg

On Tue, Oct 22, =
2019 at 9:52 PM Dinesh Dutt <didutt@gmail.com> wrote:
I have the same feeling as Anoop. Greg, can y=
ou please point me to the latest draft so that I can quickly glance through=
 it to be doubly sure,

Dinesh

On We=
d, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Greg,

I think the=
 draft is fine as is.

I discussion with Xiao Min w=
as about #3 and I see that as unnecessary until we have a draft that explai=
ns why that is needed in the context of the NVO3 architecture.
Anoop

On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.=
com> wrote:
Hi Anoop, et al.,
I agree with your understanding o=
f what is being defined in the current version of the BFD over VxLAN specif=
ication. But, as I understand, the WG is discussing the scope before the WG=
LC is closed. I believe there are three options:
  1. single B=
FD session between two VTEPs
  2. single BFD session per VNI between two=
 VTEPs
  3. multiple BFD sessions per VNI between two VTEPs
The current text reflects #2. Is WG accepts this scope? If not, which opt=
ion WG would accept?

Regards,
Greg=


On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrot=
e:
I concur with Joel's assessment with the following=
 clarifications.

The current document is already capable=
 of monitoring multiple VNIs between VTEPs.

The is=
sue under discussion was how do we use BFD to monitor multiple VAPs that us=
e the same VNI between a pair of VTEPs.=C2=A0 The use case for this is not =
clear to me, as from my understanding, we cannot have a situation with mult=
iple VAPs using the same VNI--there is 1:1 mapping between VAP and VNI.

Anoop

On Tue, Oct 22, 2019 at 6:06 AM Joel M. Ha=
lpern <jmh@joel=
halpern.com> wrote:
=C2=A0From what I can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



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Date: Thu, 24 Oct 2019 02:55:56 +0530
From: Dinesh Dutt 
To: Greg Mirsky 
Cc: Santosh P K , Anoop Ghanwani , "Joel M. Halpern" ,  Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
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You're welcome Greg. I'm glad my input was useful,

Dinesh
On Oct 24, 2019, 1:33 AM +0530, Greg Mirsky , wr=
ote:
> Hi Dinesh,
> many thanks for your time, the expertise you've kindly shared on this d=
iscussion.
> I believe that Santosh has volunteered ;) to provide some text on the f=
irewall interaction. Any other contributions are welcome and greatly appr=
eciated.
>
> Regards,
> Greg
>
> > On Wed, Oct 23, 2019 at 3:54 PM Dinesh Dutt  wrot=
e:
> > > Looks good to me Greg. I see that the text around the use of the in=
ner IP address as also quite acceptable. Will you add any words about the=
 firewall=3F
> > >
> > > Dinesh
> > >
> > > On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky  wrote:
> > > > Hi Dinesh, et al.,
> > > > please check the updated version that removed the reference to Hy=
pervisor in the text and =46igure 1.
> > > >
> > > > Regards,
> > > > Greg
> > > >
> > > > > On Wed, Oct 23, 2019 at 10:47 AM Santosh P K  wrote:
> > > > > > Dinesh,
> > > > > > =C2=A0 =C2=A0 =C2=A0Please see my inline=C2=A0comments =5BSPK=
=5D
> > > > > > > >
> > > > > > > > - In section 3, there's a sentence that is: =22B=46D pack=
ets intended for a Hypervisor VTEP MUST NOT..=22. I recommend getting rid=
 of the word =22Hypervisor=22 ashe logic applies to any VTEP.
> > > > > > > >
> > > > > > > =5BSPK=5D Thanks for comments. We will change this.
> > > > > > >
> > > > > > > > - You already explained the precedence of the use of 127/=
8 address in the inner header in MPLS. I have no specific comments in tha=
t area. I have only two questions:
> > > > > > > > =C2=A0 =C2=A0- Has anybody verified that the use of 127/8=
 address (and the right MAC) works with existing implementations, includi=
ng the silicon ones=3F If this doesn't work there, is it worth adding the=
 possibilit y of another address, one that is owned by the VTEP node=3F
> > > > > > > > =C2=A0 =C2=A0- Do we know if =46irewalls stop such VXLAN =
packets=3F I ask this because VXLAN has an IP header and I don't know if =
firewalls stop packets with 127/8 in the inner header. If not, is it wort=
h adding a sentence to say that firewalls =C2=A0allow such packets=3F The=
 use of a non-127/8 address may alleviate this case as well.
> > > > > > >
> > > > > > > =5BSPK=5D I think we may need to add the text about firewal=
l as some checks in firewall will be there if they are not already using =
MPLS OAM which has inner IP header with 127/8 address range.
> > > > > > >
> > > > > > > >
> > > > > > > > The rest of the draft looks good to me,
> > > > > > > >
> > > > > > > > Dinesh
> > > > > > > >
> > > > > > > > On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky  wrote:
> > > > > > > > > Hi Dinesh,
> > > > > > > > > I greatly appreciate your comments. Please heave a look=
 at the attached copy of the working version and its diff to -07 (latest =
in the datatracker).
> > > > > > > > >
> > > > > > > > > Regards,
> > > > > > > > > Greg
> > > > > > > > >
> > > > > > > > > > On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:
> > > > > > > > > > > I have the same feeling as Anoop. Greg, can you ple=
ase point me to the latest draft so that I can quickly glance through it =
to be doubly sure,
> > > > > > > > > > >
> > > > > > > > > > > Dinesh
> > > > > > > > > > >
> > > > > > > > > > > On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani  wrote:
> > > > > > > > > > > > Greg,
> > > > > > > > > > > >
> > > > > > > > > > > > I think the draft is fine as is.
> > > > > > > > > > > >
> > > > > > > > > > > > I discussion with Xiao Min was about =233 and I s=
ee that as unnecessary until we have a draft that explains why that is ne=
eded in the context of the NVO3 architecture.
> > > > > > > > > > > >
> > > > > > > > > > > > Anoop
> > > > > > > > > > > >
> > > > > > > > > > > > > On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky  wrote:
> > > > > > > > > > > > > > Hi Anoop, et al.,
> > > > > > > > > > > > > > I agree with your understanding of what is be=
ing defined in the current version of the B=46D over VxLAN specification.=
 But, as I understand, the WG is discussing the scope before the WGLC is =
closed. I believe there are three options:
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > 1. single B=46D session between two VTEPs
> > > > > > > > > > > > > > 2. single B=46D session per VNI between two V=
TEPs
> > > > > > > > > > > > > > 3. multiple B=46D sessions per VNI between tw=
o VTEPs
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > The current text reflects =232. Is WG accepts=
 this scope=3F If not, which option WG would accept=3F
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Regards,
> > > > > > > > > > > > > > Greg
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > > On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanw=
ani  wrote:
> > > > > > > > > > > > > > > > I concur with Joel's assessment with the =
following clarifications.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > The current document is already capable o=
f monitoring multiple VNIs between VTEPs.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > The issue under discussion was how do we =
use B=46D to monitor multiple VAPs that use the same VNI between a pair o=
f VTEPs.=C2=A0 The use case for this is not clear to me, as from my under=
standing, we cannot have a situation with multiple VAPs using the same VN=
I--there is 1:1 mapping between VAP and VNI.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > Anoop
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > On Tue, Oct 22, 2019 at 6:06 AM Joel M.=
 Halpern  wrote:
> > > > > > > > > > > > > > > > > > =C2=A0=46rom what I can tell, there a=
re two separate problems.
> > > > > > > > > > > > > > > > > > The document we have is a VTEP-VTEP m=
onitoring document.=C2=A0 There is no
> > > > > > > > > > > > > > > > > > need for that document to handle the =
multiple VNI case.
> > > > > > > > > > > > > > > > > > If folks want a protocol for doing B=46=
D monitoring of things behind the
> > > > > > > > > > > > > > > > > > VTEPs (multiple VNIs), then do that a=
s a separate document.=C2=A0 =C2=A0The
> > > > > > > > > > > > > > > > > > encoding will be a tenant encoding, a=
nd thus sesparate from what is
> > > > > > > > > > > > > > > > > > defined in this document.
> > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > Yours,
> > > > > > > > > > > > > > > > > > Joel
> > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > On 10/21/2019 5:07 PM, Jeffrey Haas w=
rote:
> > > > > > > > > > > > > > > > > > > Santosh and others,
> > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > On Thu, Oct 03, 2019 at 07:50:20PM =
+0530, Santosh P K wrote:
> > > > > > > > > > > > > > > > > > >>=C2=A0 =C2=A0 =C2=A0Thanks for your=
 explanation. This helps a lot. I would wait for more
> > > > > > > > > > > > > > > > > > >> comments from others to see if thi=
s what we need in this draft to be
> > > > > > > > > > > > > > > > > > >> supported based on that we can pro=
vide appropriate sections in the draft.
> > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > The threads on the list have spider=
ed to the point where it is challenging
> > > > > > > > > > > > > > > > > > > to follow what the current status o=
f the draft is, or should be.=C2=A0 :-)
> > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > However, if I've followed things pr=
operly, the question below is really the
> > > > > > > > > > > > > > > > > > > hinge point on what our encapsulati=
on for B=46D over vxlan should look like.
> > > > > > > > > > > > > > > > > > > Correct=3F
> > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > Essentially, do we or do we not req=
uire the ability to permit multiple B=46D
> > > > > > > > > > > > > > > > > > > sessions between distinct VAPs=3F
> > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > If this is so, do we have a sense a=
s to how we should proceed=3F
> > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > -- Jeff
> > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > =5Bcontext preserved below...=5D
> > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > >> Santosh P K
> > > > > > > > > > > > > > > > > > >>
> > > > > > > > > > > > > > > > > > >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
> > > > > > > > > > > > > > > > > > >>
> > > > > > > > > > > > > > > > > > >>> Hi Santosh,
> > > > > > > > > > > > > > > > > > >>>
> > > > > > > > > > > > > > > > > > >>>
> > > > > > > > > > > > > > > > > > >>> With regard to the question wheth=
er we should allow multiple B=46D sessions
> > > > > > > > > > > > > > > > > > >>> for the same VNI or not, IMHO we =
should allow it, more explanation as
> > > > > > > > > > > > > > > > > > >>> follows.
> > > > > > > > > > > > > > > > > > >>>
> > > > > > > > > > > > > > > > > > >>> Below is a figure derived from fi=
gure 2 of R=46C8014 (An Architecture for
> > > > > > > > > > > > > > > > > > >>> Data-Center Network Virtualizatio=
n over Layer 3 (NVO3)).
> > > > > > > > > > > > > > > > > > >>>
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =7C=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0Data Center Network (IP)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =7C=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +-----------------------------=
------------+
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0=7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =
=C2=A0 =C2=A0 =C2=A0Tunnel Overlay=C2=A0 =C2=A0 =C2=A0 =7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 +------------+---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+------=
---+------------+
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =7C +----------+-------+ =7C=C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=
 +-------+----------+ =7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =7C =7C=C2=A0 Overlay Module=C2=A0 =7C =7C=C2=A0 =C2=A0 =C2=
=A0 =C2=A0=7C =7C=C2=A0 Overlay Module=C2=A0 =7C =7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =7C +---------+--------+ =7C=C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=
 +---------+--------+ =7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =7C=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =7C=C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=
=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =7C=C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =7C NVE2
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =7C=C2=A0 +--------+-------+=C2=A0 =7C=C2=A0 =C2=A0 =C2=A0=
 =C2=A0=7C=C2=A0 +--------+-------+=C2=A0 =7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =7C=C2=A0 =7CVNI1 VNI2=C2=A0 VNI1 =7C=C2=A0 =7C=C2=A0 =C2=A0=
 =C2=A0 =C2=A0=7C=C2=A0 =7C VNI1 VNI2 VNI1 =7C=C2=A0 =7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =7C=C2=A0 +-+-----+----+---+=C2=A0 =7C=C2=A0 =C2=A0 =C2=A0=
 =C2=A0=7C=C2=A0 +-+-----+-----+--+=C2=A0 =7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =7CVAP1=7C VAP2=7C=C2=A0 =C2=A0 =7C VAP3 =7C=C2=A0 =C2=A0 =
=C2=A0 =C2=A0=7CVAP1=7C VAP2=7C=C2=A0 =C2=A0 =C2=A0=7C VAP3=7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 +----+-----+----+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-=
----+-----+-----+
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0=
 =7C=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
=7C=C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0=7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0=
 =7C=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
=7C=C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0=7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0=
 =7C=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
=7C=C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0=7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 -------+-----+----+-------------------+-----+-----+-------
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0=7C=C2=A0 =C2=A0=
 =7C=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0 =C2=A0 =C2=A0 =C2=A0 =7C=C2=A0 =C2=A0=
 =C2=A0=7C=C2=A0 =C2=A0 =C2=A0=7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 TSI1 =7C TSI2=7C=C2=A0 =C2=A0 =7C TSI3=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 TSI1=7C TSI2=7C=C2=A0 =C2=A0 =C2=A0=7CTSI3
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0+---+ +---+=C2=A0 =C2=A0+---+
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =7CTS1=7C =7CTS2=7C =7CTS3=7C=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=7CTS4=7C =7CTS5=7C=C2=A0 =C2=A0=7CTS6=7C
> > > > > > > > > > > > > > > > > > >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0+---+ +---+=C2=A0 =C2=A0+---+
> > > > > > > > > > > > > > > > > > >>>
> > > > > > > > > > > > > > > > > > >>> To my understanding, the B=46D se=
ssions between NVE1 and NVE2 are actually
> > > > > > > > > > > > > > > > > > >>> initiated and terminated at VAP o=
f NVE.
> > > > > > > > > > > > > > > > > > >>>
> > > > > > > > > > > > > > > > > > >>> If the network operator want to s=
et up one B=46D session between VAP1 of
> > > > > > > > > > > > > > > > > > >>> NVE1 and VAP1of NVE2, at the same=
 time another B=46D session between VAP3 of
> > > > > > > > > > > > > > > > > > >>> NVE1 and VAP3 of NVE2, although t=
he two B=46D sessions are for the same
> > > > > > > > > > > > > > > > > > >>> VNI1, I believe it's reasonable, =
so that's why I think we should allow it
> > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F
> > > > > > > > > > > > > > > > > > nvo3 mailing list
> > > > > > > > > > > > > > > > > > nvo3=40ietf.org
> > > > > > > > > > > > > > > > > > https://www.ietf.org/mailman/listinfo=
/nvo3

--5db0c56a_559fe50_c2e
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline









You're welcome Greg. I'm glad my input was useful,<=
br />


Dinesh




On Oct 24, 2019, 1:33 AM +0530, Gre=
g Mirsky <gregimirsky=40gmail.com>, wrote:




Hi Dinesh,

many thanks for your time, the expertise you've kindly shared on thi=
s discussion.


I believe that Santosh has volunteered ;) to provide some text on th=
e firewall interaction. Any other contributions are welcome and greatly a=
ppreciated.





Regards,


Greg&=23160;








On Wed, Oct 23, 2019 at 3=
:54 PM Dinesh Dutt <didutt=40=
gmail.com> wrote:




=


Looks good to me Greg. I see that the text around the use of the inn=
er IP address as also quite acceptable. Will you add any words about the =
firewall=3F





Dinesh






On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky <gregimirsky=40gmail.com> wrote:




Hi Dinesh, et al.,

please check the updated version that removed the reference to Hyper=
visor in the text and =46igure 1.





Regards,


Greg








On Wed, Oct 23, 2019 at 1=
0:47 AM Santosh P K <santosh.pallagatti=40gmail.com> wrote=
:






Dinesh,


&=23160; &=23160; &=23160;Please see my inline&=23160;comments =5BSP=
K=5D











- In section 3, there's a sentence that is: =22B=46D packets intende=
d for a Hypervisor VTEP MUST NOT..=22. I recommend getting rid of the wor=
d =22Hypervisor=22 ashe logic applies to any VTEP.









=5BSPK=5D Thanks for comments. We will change this.&=23160;


&=23160;








- You already explained the precedence of the use of 127/8 address i=
n the inner header in MPLS. I have no specific comments in that area. I h=
ave only two questions:&=23160;


&=23160; &=23160;- Has anybody verified that the use of 127/8 addres=
s (and the right MAC) works with existing implementations, including the =
silicon ones=3F If this doesn't work there, is it worth adding the possib=
ilit y of another address, one that is owned by the VTEP node=3F










&=23160; &=23160;- Do we know if =46irewalls stop such VXLAN packets=
=3F I ask this because VXLAN has an IP header and I don't know if firewal=
ls stop packets with 127/8 in the inner header. If not, is it worth addin=
g a sentence to say that firewalls &=23160;allow such packets=3F The use =
of a non-127/8 address may alleviate this case as well.






&=23160;


=5BSPK=5D I think we may need to add the text about firewall as some=
 checks in firewall will be there if they are not already using MPLS OAM =
which has inner IP header with 127/8 address range.&=23160;


&=23160;









The rest of the draft looks good to me,





Dinesh&=23160;






On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky <gregimirsky=40gmail.com> wrote:




Hi Dinesh,

I greatly appreciate your comments. Please heave a look at the attac=
hed copy of the working version and its diff to -07 (latest in the datatr=
acker).





Regards,


Greg








On Tue, Oct 22, 2019 at 9=
:52 PM Dinesh Dutt <didutt=40gmail.com> wrote:






I have the same feeling as Anoop. Greg, can you please point me to t=
he latest draft so that I can quickly glance through it to be doubly sure=
,





Dinesh






On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani <anoop=40alumni.duke.edu=
> wrote:




Greg,




I think the draft is fine as is.





I discussion with Xiao Min was about =233 and I see that as unnecess=
ary until we have a draft that explains why that is needed in the context=
 of the NVO3 architecture.





Anoop








On Tue, Oct 22, 2019 at 1=
1:17 AM Greg Mirsky <gregimirsky=40gmail.com> wrote:




Hi Anoop, et al.,

I agree with your understanding of what is being defined in the curr=
ent version of the B=46D over VxLAN specification. But, as I understand, =
the WG is discussing the scope before the WGLC is closed. I believe there=
 are three options:




    

  1. single B=46D session between two VTEPs
    2. 

  2. single B=46D session per VNI between two VTEPs
    3. 

  3. multiple B=46D sessions per VNI between two VTEPs
    4. 



The current text reflects =232. Is WG accepts this scope=3F If not, =
which option WG would accept=3F







Regards,


Greg








On Tue, Oct 22, 2019 at 2=
:09 PM Anoop Ghanwani <anoop=40alumni.duke.edu> wrote:






I concur with Joel's assessment with the following c=
larifications.




The current document is already capable of monitoring multiple VNIs =
between VTEPs.





The issue under discussion was how do we use B=46D to monitor multip=
le VAPs that use the same VNI between a pair of VTEPs.&=23160; The use ca=
se for this is not clear to me, as from my understanding, we cannot have =
a situation with multiple VAPs using the same VNI--there is 1:1 mapping b=
etween VAP and VNI.





Anoop








On Tue, Oct 22, 2019 at 6=
:06 AM Joel M. Halpern <jmh=40joelhalpern.com> wrote:


&=23160;=46=
rom what I can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.&=23160; There is=
 no

need for that document to handle the multiple VNI case.

If folks want a protocol for doing B=46D monitoring of things behind the<=
br />
VTEPs (multiple VNIs), then do that as a separate document.&=23160; &=231=
60;The

encoding will be a tenant encoding, and thus sesparate from what is
=

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

>

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>&=23160; &=23160; &=23160;Thanks for your explanation. This helps=
 a lot. I would wait for more

>> comments from others to see if this what we need in this draft t=
o be

>> supported based on that we can provide appropriate sections in t=
he draft.

>

> The threads on the list have spidered to the point where it is chall=
enging

> to follow what the current status of the draft is, or should be.&=23=
160; :-)

>

> However, if I've followed things properly, the question below is rea=
lly the

> hinge point on what our encapsulation for B=46D over vxlan should lo=
ok like.

> Correct=3F

>

> Essentially, do we or do we not require the ability to permit multip=
le B=46D

> sessions between distinct VAPs=3F

>

> If this is so, do we have a sense as to how we should proceed=3F

>

> -- Jeff

>

> =5Bcontext preserved below...=5D

>

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2=40zte.com.cn> =
wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple=
 B=46D sessions

>>> for the same VNI or not, IMHO we should allow it, more expla=
nation as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of R=46C8014 (An Arc=
hitecture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; =7C&=23160; &=23160; &=23160; &=231=
60; &=23160;Data Center Network (IP)&=23160; &=23160; &=23160; &=23160; =7C=


>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; =7C&=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160;=7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; +----------------------------------=
-------+

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=7C&=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160;=7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=7C&=2316=
0; &=23160; &=23160; &=23160;Tunnel Overlay&=23160; &=23160; &=23160; =7C=


>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; +------------+---------+&=23160; &=23160; &=23160; &=23160;+---------+-=
-----------+

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; =7C +----------+-------+ =7C&=23160; &=23160; &=23160; &=23160;=7C +---=
----+----------+ =7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; =7C =7C&=23160; Overlay Module&=23160; =7C =7C&=23160; &=23160; &=23160=
; &=23160;=7C =7C&=23160; Overlay Module&=23160; =7C =7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; =7C +---------+--------+ =7C&=23160; &=23160; &=23160; &=23160;=7C +---=
------+--------+ =7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; =7C&=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=7C&=23160; &=23=
160; &=23160; &=23160; &=23160; =7C&=23160; &=23160; &=23160; &=23160;=7C=
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=7C&=23160; &=23160;=
 &=23160; &=23160; &=23160; =7C

>>>&=23160; &=23160; &=23160; &=23160;NVE1&=23160; &=23160;=7C&=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160;=7C&=23160; &=23160; &=23=
160; &=23160; &=23160; =7C&=23160; &=23160; &=23160; &=23160;=7C&=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160;=7C&=23160; &=23160; &=23160;=
 &=23160; &=23160; =7C NVE2

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; =7C&=23160; +--------+-------+&=23160; =7C&=23160; &=23160; &=23160; &=23=
160;=7C&=23160; +--------+-------+&=23160; =7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; =7C&=23160; =7CVNI1 VNI2&=23160; VNI1 =7C&=23160; =7C&=23160; &=23160; =
&=23160; &=23160;=7C&=23160; =7C VNI1 VNI2 VNI1 =7C&=23160; =7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; =7C&=23160; +-+-----+----+---+&=23160; =7C&=23160; &=23160; &=23160; &=23=
160;=7C&=23160; +-+-----+-----+--+&=23160; =7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; =7CVAP1=7C VAP2=7C&=23160; &=23160; =7C VAP3 =7C&=23160; &=23160; &=231=
60; &=23160;=7CVAP1=7C VAP2=7C&=23160; &=23160; &=23160;=7C VAP3=7C
=

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; +----+-----+----+------+&=23160; &=23160; &=23160; &=23160;+----+-----+=
-----+-----+

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160;=7C&=23160; &=23160; &=23160;=7C&=23160; &=23=
160; =7C&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160;=7C&=23160; &=23160; &=23160;=7C&=23160; &=23160; &=
=23160;=7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160;=7C&=23160; &=23160; &=23160;=7C&=23160; &=23=
160; =7C&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160;=7C&=23160; &=23160; &=23160;=7C&=23160; &=23160; &=
=23160;=7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160;=7C&=23160; &=23160; &=23160;=7C&=23160; &=23=
160; =7C&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160;=7C&=23160; &=23160; &=23160;=7C&=23160; &=23160; &=
=23160;=7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; -------=
+-----+----+-------------------+-----+-----+-------

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160;=7C&=23160; &=23160; &=23160;=7C&=23160; &=23=
160; =7C&=23160; &=23160; &=23160;Tenant&=23160; &=23160; &=23160; &=2316=
0; =7C&=23160; &=23160; &=23160;=7C&=23160; &=23160; &=23160;=7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; TSI1 =7C TSI2=7C&=23160; &=23160; =7C TSI3&=23160; &=23160; &=23160; &=23=
160; &=23160; TSI1=7C TSI2=7C&=23160; &=23160; &=23160;=7CTSI3

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; +---+ +---+ +---+&=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160;+---+ +---+&=23160; &=23160;+---+

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; =7CTS1=7C =7CTS2=7C =7CTS3=7C&=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160;=7CTS4=7C =7CTS5=7C&=23160; &=23160=
;=7CTS6=7C

>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; +---+ +---+ +---+&=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160;+---+ +---+&=23160; &=23160;+---+

>>>

>>> To my understanding, the B=46D sessions between NVE1 and NVE=
2 are actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one B=46D session bet=
ween VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another B=46D session=
 between VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two B=46D sessions are f=
or the same

>>> VNI1, I believe it's reasonable, so that's why I think we sh=
ould allow it



=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F

nvo3 mailing list

nvo3=40iet=
f.org

https://www.ietf.org/mailman/listinfo/nv=
o3


















































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Dear Jeffrey Haas,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    bfd Session 1 (1:00 requested)
    Tuesday, 19 November 2019, Afternoon Session III 1710-1840
    Room Name: VIP A size: 100
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/106/sessions/bfd.ics

Request Information:


---------------------------------------------------------
Working Group Name: Bidirectional Forwarding Detection
Area Name: Routing Area
Session Requester: Jeffrey Haas

Number of Sessions: 1
Length of Session(s):  1 Hour
Number of Attendees: 50
Conflicts to Avoid: 
 Chair Conflict: idr grow rtgwg bess lisp netmod netconf
 Technology Overlap: bier spring mpls teas pals sfc
 Key Participant Conflict: ccamp


People who must be present:
  Jeffrey Haas
  Reshad Rahman
  Martin Vigoureux

Resources Requested:

Special Requests:
  
---------------------------------------------------------


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From: Santosh P K 
Date: Mon, 28 Oct 2019 20:21:13 +0530
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Dinesh Dutt 
Cc: Greg Mirsky , Anoop Ghanwani , "Joel M. Halpern" , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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--0000000000004486cf0595f9a24d
Content-Type: text/plain; charset="UTF-8"

Dinesh, Anoop et all,
     Lets us know if this text works for 127/8 address range?

[proposed text for firewall]

"As per section 4 inner destination IP address MUST be set to 127/8
address. There may be firewall configured on VTEP to block 127/8 address
range if set as destination IP in inner IP header. It is recommended to
allow 127/8 range address through firewall only if 127/8 IP address is set
as destination address in inner IP header."


In section 4 we are talking about using 127/8 and not really giving reason
why. I think we should have text as RFC 5884 has mentioned with below text.

[From RFC 5884]
" The motivation for using the address range 127/8 is the same as specified
in Section 2.1 of [RFC4379]
. This is an exception to
the behavior defined in [RFC1122 ]."



Thanks
Santosh P K



On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt  wrote:

> Looks good to me Greg. I see that the text around the use of the inner IP
> address as also quite acceptable. Will you add any words about the firewall?
>
> Dinesh
>
> On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky 
> wrote:
>
> Hi Dinesh, et al.,
> please check the updated version that removed the reference to Hypervisor
> in the text and Figure 1.
>
> Regards,
> Greg
>
> On Wed, Oct 23, 2019 at 10:47 AM Santosh P K 
> wrote:
>
>> Dinesh,
>>      Please see my inline comments [SPK]
>>
>>>
>>> - In section 3, there's a sentence that is: "BFD packets intended for a
>>> Hypervisor VTEP MUST NOT..". I recommend getting rid of the word
>>> "Hypervisor" ashe logic applies to any VTEP.
>>>
>>> [SPK] Thanks for comments. We will change this.
>>
>>
>>> - You already explained the precedence of the use of 127/8 address in
>>> the inner header in MPLS. I have no specific comments in that area. I have
>>> only two questions:
>>>    - Has anybody verified that the use of 127/8 address (and the right
>>> MAC) works with existing implementations, including the silicon ones? If
>>> this doesn't work there, is it worth adding the possibilit y of another
>>> address, one that is owned by the VTEP node?
>>>
>>    - Do we know if Firewalls stop such VXLAN packets? I ask this because
>>> VXLAN has an IP header and I don't know if firewalls stop packets with
>>> 127/8 in the inner header. If not, is it worth adding a sentence to say
>>> that firewalls  allow such packets? The use of a non-127/8 address may
>>> alleviate this case as well.
>>>
>>
>> [SPK] I think we may need to add the text about firewall as some checks
>> in firewall will be there if they are not already using MPLS OAM which has
>> inner IP header with 127/8 address range.
>>
>>
>>>
>>> The rest of the draft looks good to me,
>>>
>>> Dinesh
>>>
>>> On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky 
>>> wrote:
>>>
>>> Hi Dinesh,
>>> I greatly appreciate your comments. Please heave a look at the attached
>>> copy of the working version and its diff to -07 (latest in the datatracker).
>>>
>>> Regards,
>>> Greg
>>>
>>> On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:
>>>
>>>> I have the same feeling as Anoop. Greg, can you please point me to the
>>>> latest draft so that I can quickly glance through it to be doubly sure,
>>>>
>>>> Dinesh
>>>>
>>>> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani 
>>>> wrote:
>>>>
>>>> Greg,
>>>>
>>>> I think the draft is fine as is.
>>>>
>>>> I discussion with Xiao Min was about #3 and I see that as unnecessary
>>>> until we have a draft that explains why that is needed in the context of
>>>> the NVO3 architecture.
>>>>
>>>> Anoop
>>>>
>>>> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
>>>> wrote:
>>>>
>>>>> Hi Anoop, et al.,
>>>>> I agree with your understanding of what is being defined in the
>>>>> current version of the BFD over VxLAN specification. But, as I understand,
>>>>> the WG is discussing the scope before the WGLC is closed. I believe there
>>>>> are three options:
>>>>>
>>>>>    1. single BFD session between two VTEPs
>>>>>    2. single BFD session per VNI between two VTEPs
>>>>>    3. multiple BFD sessions per VNI between two VTEPs
>>>>>
>>>>> The current text reflects #2. Is WG accepts this scope? If not, which
>>>>> option WG would accept?
>>>>>
>>>>> Regards,
>>>>> Greg
>>>>>
>>>>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
>>>>> wrote:
>>>>>
>>>>>> I concur with Joel's assessment with the following clarifications.
>>>>>>
>>>>>> The current document is already capable of monitoring multiple VNIs
>>>>>> between VTEPs.
>>>>>>
>>>>>> The issue under discussion was how do we use BFD to monitor multiple
>>>>>> VAPs that use the same VNI between a pair of VTEPs.  The use case for this
>>>>>> is not clear to me, as from my understanding, we cannot have a situation
>>>>>> with multiple VAPs using the same VNI--there is 1:1 mapping between VAP and
>>>>>> VNI.
>>>>>>
>>>>>> Anoop
>>>>>>
>>>>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>>>>>> wrote:
>>>>>>
>>>>>>>  From what I can tell, there are two separate problems.
>>>>>>> The document we have is a VTEP-VTEP monitoring document.  There is
>>>>>>> no
>>>>>>> need for that document to handle the multiple VNI case.
>>>>>>> If folks want a protocol for doing BFD monitoring of things behind
>>>>>>> the
>>>>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>>>>> encoding will be a tenant encoding, and thus sesparate from what is
>>>>>>> defined in this document.
>>>>>>>
>>>>>>> Yours,
>>>>>>> Joel
>>>>>>>
>>>>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>>>>> > Santosh and others,
>>>>>>> >
>>>>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>>>>> >>     Thanks for your explanation. This helps a lot. I would wait
>>>>>>> for more
>>>>>>> >> comments from others to see if this what we need in this draft to
>>>>>>> be
>>>>>>> >> supported based on that we can provide appropriate sections in
>>>>>>> the draft.
>>>>>>> >
>>>>>>> > The threads on the list have spidered to the point where it is
>>>>>>> challenging
>>>>>>> > to follow what the current status of the draft is, or should be.
>>>>>>> :-)
>>>>>>> >
>>>>>>> > However, if I've followed things properly, the question below is
>>>>>>> really the
>>>>>>> > hinge point on what our encapsulation for BFD over vxlan should
>>>>>>> look like.
>>>>>>> > Correct?
>>>>>>> >
>>>>>>> > Essentially, do we or do we not require the ability to permit
>>>>>>> multiple BFD
>>>>>>> > sessions between distinct VAPs?
>>>>>>> >
>>>>>>> > If this is so, do we have a sense as to how we should proceed?
>>>>>>> >
>>>>>>> > -- Jeff
>>>>>>> >
>>>>>>> > [context preserved below...]
>>>>>>> >
>>>>>>> >> Santosh P K
>>>>>>> >>
>>>>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>>>>> >>
>>>>>>> >>> Hi Santosh,
>>>>>>> >>>
>>>>>>> >>>
>>>>>>> >>> With regard to the question whether we should allow multiple BFD
>>>>>>> sessions
>>>>>>> >>> for the same VNI or not, IMHO we should allow it, more
>>>>>>> explanation as
>>>>>>> >>> follows.
>>>>>>> >>>
>>>>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An
>>>>>>> Architecture for
>>>>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>>> >>>
>>>>>>> >>>                      |         Data Center Network (IP)        |
>>>>>>> >>>                      |                                         |
>>>>>>> >>>                      +-----------------------------------------+
>>>>>>> >>>                           |                           |
>>>>>>> >>>                           |       Tunnel Overlay      |
>>>>>>> >>>              +------------+---------+
>>>>>>>  +---------+------------+
>>>>>>> >>>              | +----------+-------+ |       |
>>>>>>> +-------+----------+ |
>>>>>>> >>>              | |  Overlay Module  | |       | |  Overlay Module
>>>>>>> | |
>>>>>>> >>>              | +---------+--------+ |       |
>>>>>>> +---------+--------+ |
>>>>>>> >>>              |           |          |       |           |
>>>>>>>   |
>>>>>>> >>>       NVE1   |           |          |       |           |
>>>>>>>   | NVE2
>>>>>>> >>>              |  +--------+-------+  |       |
>>>>>>> +--------+-------+  |
>>>>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1
>>>>>>> |  |
>>>>>>> >>>              |  +-+-----+----+---+  |       |
>>>>>>> +-+-----+-----+--+  |
>>>>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     |
>>>>>>> VAP3|
>>>>>>> >>>              +----+-----+----+------+
>>>>>>>  +----+-----+-----+-----+
>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>> >>>
>>>>>>> -------+-----+----+-------------------+-----+-----+-------
>>>>>>> >>>                   |     |    |     Tenant        |     |     |
>>>>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|
>>>>>>>  |TSI3
>>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+
>>>>>>>  +---+
>>>>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|
>>>>>>>  |TS6|
>>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+
>>>>>>>  +---+
>>>>>>> >>>
>>>>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>>>> actually
>>>>>>> >>> initiated and terminated at VAP of NVE.
>>>>>>> >>>
>>>>>>> >>> If the network operator want to set up one BFD session between
>>>>>>> VAP1 of
>>>>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session
>>>>>>> between VAP3 of
>>>>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for the
>>>>>>> same
>>>>>>> >>> VNI1, I believe it's reasonable, so that's why I think we should
>>>>>>> allow it
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> nvo3 mailing list
>>>>>>> nvo3@ietf.org
>>>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>>>
>>>>>>

--0000000000004486cf0595f9a24d
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Dinesh, Anoop et all,
=C2=A0 =C2=A0 =C2=A0L=
ets us know if this text works for 127/8 address range?

[proposed text for firewall]

"As per se=
ction 4 inner destination IP address MUST be set to 127/8 address. There ma=
y be firewall configured on VTEP to block 127/8 address range if set as des=
tination IP in inner IP header. It is recommended to allow 127/8 range addr=
ess through firewall only if 127/8 IP address is set as destination address=
 in inner IP header."


In =
section 4 we are talking about using 127/8 and not really giving reason why=
. I think we should have text as RFC 5884 has mentioned with below text.

[From RFC 5884]
"   The motivation for using the address ra=
nge 127/8 is the same as=C2=A0specified in Section=C2=A02.1 of [RFC4=
379].  This is an =
exception to the=C2=A0behavior defined in [RFC1122]."



Thanks
Santosh P K=C2=A0



On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt <<=
a href=3D"mailto:didutt@gmail.com">didutt@gmail.com> wrote:
Looks good to me Greg. I see tha=
t the text around the use of the inner IP address as also quite acceptable.=
 Will you add any words about the firewall?

Dinesh=

=

On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dinesh, et al.,
please =
check the updated version that removed the reference to Hypervisor in the t=
ext and Figure 1.

Regards,
Greg

On =
Wed, Oct 23, 2019 at 10:47 AM Santosh P K <santosh.pallagatti@gmail.com> w=
rote:
Dinesh,
=C2=A0 =C2=A0 =C2=A0Please see my inline=C2=
=A0comments [SPK]
- In section 3, there's a sentence that is: "BFD pack=
ets intended for a Hypervisor VTEP MUST NOT..". I recommend getting ri=
d of the word "Hypervisor" ashe logic applies to any VTEP.
<=
div>
[SPK] Thanks for comments. We will ch=
ange this.=C2=A0
=C2=A0
- =
You already explained the precedence of the use of 127/8 address in the inn=
er header in MPLS. I have no specific comments in that area. I have only tw=
o questions:=C2=A0
=C2=A0 =C2=A0- Has anybody verified that the u=
se of 127/8 address (and the right MAC) works with existing implementations=
, including the silicon ones? If this doesn't work there, is it worth a=
dding the possibilit y of another address, one that is owned by the VTEP no=
de?
=C2=A0 =C2=A0- Do we kno=
w if Firewalls stop such VXLAN packets? I ask this because VXLAN has an IP =
header and I don't know if firewalls stop packets with 127/8 in the inn=
er header. If not, is it worth adding a sentence to say that firewalls =C2=
=A0allow such packets? The use of a non-127/8 address may alleviate this ca=
se as well.
=C2=A0
[SPK] I think we =
may need to add the text about firewall as some checks in firewall will be =
there if they are not already using MPLS OAM which has inner IP header with=
 127/8 address range.=C2=A0
=C2=A0
The rest of the draft looks good to me,

Dinesh=C2=A0

=
On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dinesh,
I greatly appreciat=
e your comments. Please heave a look at the attached copy of the working ve=
rsion and its diff to -07 (latest in the datatracker).

=

Regards,
Greg

On Tue, Oct 22, 2019 at 9:52 PM Dinesh Du=
tt <didutt@gmail.c=
om> wrote:
I have the same feeling as Anoop. Greg, can you please point me to the l=
atest draft so that I can quickly glance through it to be doubly sure,

Dinesh

On Wed, Oct 23, 2019 at 4:35 AM, An=
oop Ghanwani <anoop@alumni.duke.edu> wrote:
Greg,

I think the draft is fine as is.

I discussion with Xiao Min was about #3 and I see that as =
unnecessary until we have a draft that explains why that is needed in the c=
ontext of the NVO3 architecture.

Anoop
=

On Tue=
, Oct 22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop, =
et al.,
I agree with your understanding of what is being defined in the=
 current version of the BFD over VxLAN specification. But, as I understand,=
 the WG is discussing the scope before the WGLC is closed. I believe there =
are three options:
  1. single BFD session between two VTEPs
  2. single BFD session per VNI between two VTEPs
  3. multiple BFD se=
ssions per VNI between two VTEPs
The current text reflects #2=
. Is WG accepts this scope? If not, which option WG would accept?

Regards,
Greg

On Tue, Oct 22, 2019 at =
2:09 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
I concur=
 with Joel's assessment with the following clarifications.

The current document is already capable of monitoring multiple VNIs =
between VTEPs.

The issue under discussion was how =
do we use BFD to monitor multiple VAPs that use the same VNI between a pair=
 of VTEPs.=C2=A0 The use case for this is not clear to me, as from my under=
standing, we cannot have a situation with multiple VAPs using the same VNI-=
-there is 1:1 mapping between VAP and VNI.

Anoop

On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
=C2=A0From what I =
can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



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In-Reply-To: 
From: Anoop Ghanwani 
Date: Mon, 28 Oct 2019 09:23:02 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Santosh P K 
Cc: Dinesh Dutt , Greg Mirsky ,  "Joel M. Halpern" , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Santosh,

Does it have to be a MUST?  What if I am running IRB and there are IP
addresses per VNI assigned to the VTEPs?  Why can the operator not choose
to use those?

Anoop

On Mon, Oct 28, 2019 at 7:51 AM Santosh P K 
wrote:

> Dinesh, Anoop et all,
>      Lets us know if this text works for 127/8 address range?
>
> [proposed text for firewall]
>
> "As per section 4 inner destination IP address MUST be set to 127/8
> address. There may be firewall configured on VTEP to block 127/8 address
> range if set as destination IP in inner IP header. It is recommended to
> allow 127/8 range address through firewall only if 127/8 IP address is set
> as destination address in inner IP header."
>
>
> In section 4 we are talking about using 127/8 and not really giving reason
> why. I think we should have text as RFC 5884 has mentioned with below text.
>
> [From RFC 5884]
> " The motivation for using the address range 127/8 is the same as specified
> in Section 2.1 of [RFC4379]
> . This is an exception
> to the behavior defined in [RFC1122 
> ]."
>
>
>
> Thanks
> Santosh P K
>
>
>
> On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt  wrote:
>
>> Looks good to me Greg. I see that the text around the use of the inner IP
>> address as also quite acceptable. Will you add any words about the firewall?
>>
>> Dinesh
>>
>> On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky 
>> wrote:
>>
>> Hi Dinesh, et al.,
>> please check the updated version that removed the reference to Hypervisor
>> in the text and Figure 1.
>>
>> Regards,
>> Greg
>>
>> On Wed, Oct 23, 2019 at 10:47 AM Santosh P K <
>> santosh.pallagatti@gmail.com> wrote:
>>
>>> Dinesh,
>>>      Please see my inline comments [SPK]
>>>
>>>>
>>>> - In section 3, there's a sentence that is: "BFD packets intended for a
>>>> Hypervisor VTEP MUST NOT..". I recommend getting rid of the word
>>>> "Hypervisor" ashe logic applies to any VTEP.
>>>>
>>>> [SPK] Thanks for comments. We will change this.
>>>
>>>
>>>> - You already explained the precedence of the use of 127/8 address in
>>>> the inner header in MPLS. I have no specific comments in that area. I have
>>>> only two questions:
>>>>    - Has anybody verified that the use of 127/8 address (and the right
>>>> MAC) works with existing implementations, including the silicon ones? If
>>>> this doesn't work there, is it worth adding the possibilit y of another
>>>> address, one that is owned by the VTEP node?
>>>>
>>>    - Do we know if Firewalls stop such VXLAN packets? I ask this because
>>>> VXLAN has an IP header and I don't know if firewalls stop packets with
>>>> 127/8 in the inner header. If not, is it worth adding a sentence to say
>>>> that firewalls  allow such packets? The use of a non-127/8 address may
>>>> alleviate this case as well.
>>>>
>>>
>>> [SPK] I think we may need to add the text about firewall as some checks
>>> in firewall will be there if they are not already using MPLS OAM which has
>>> inner IP header with 127/8 address range.
>>>
>>>
>>>>
>>>> The rest of the draft looks good to me,
>>>>
>>>> Dinesh
>>>>
>>>> On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky 
>>>> wrote:
>>>>
>>>> Hi Dinesh,
>>>> I greatly appreciate your comments. Please heave a look at the attached
>>>> copy of the working version and its diff to -07 (latest in the datatracker).
>>>>
>>>> Regards,
>>>> Greg
>>>>
>>>> On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:
>>>>
>>>>> I have the same feeling as Anoop. Greg, can you please point me to the
>>>>> latest draft so that I can quickly glance through it to be doubly sure,
>>>>>
>>>>> Dinesh
>>>>>
>>>>> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani 
>>>>> wrote:
>>>>>
>>>>> Greg,
>>>>>
>>>>> I think the draft is fine as is.
>>>>>
>>>>> I discussion with Xiao Min was about #3 and I see that as unnecessary
>>>>> until we have a draft that explains why that is needed in the context of
>>>>> the NVO3 architecture.
>>>>>
>>>>> Anoop
>>>>>
>>>>> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
>>>>> wrote:
>>>>>
>>>>>> Hi Anoop, et al.,
>>>>>> I agree with your understanding of what is being defined in the
>>>>>> current version of the BFD over VxLAN specification. But, as I understand,
>>>>>> the WG is discussing the scope before the WGLC is closed. I believe there
>>>>>> are three options:
>>>>>>
>>>>>>    1. single BFD session between two VTEPs
>>>>>>    2. single BFD session per VNI between two VTEPs
>>>>>>    3. multiple BFD sessions per VNI between two VTEPs
>>>>>>
>>>>>> The current text reflects #2. Is WG accepts this scope? If not, which
>>>>>> option WG would accept?
>>>>>>
>>>>>> Regards,
>>>>>> Greg
>>>>>>
>>>>>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani 
>>>>>> wrote:
>>>>>>
>>>>>>> I concur with Joel's assessment with the following clarifications.
>>>>>>>
>>>>>>> The current document is already capable of monitoring multiple VNIs
>>>>>>> between VTEPs.
>>>>>>>
>>>>>>> The issue under discussion was how do we use BFD to monitor multiple
>>>>>>> VAPs that use the same VNI between a pair of VTEPs.  The use case for this
>>>>>>> is not clear to me, as from my understanding, we cannot have a situation
>>>>>>> with multiple VAPs using the same VNI--there is 1:1 mapping between VAP and
>>>>>>> VNI.
>>>>>>>
>>>>>>> Anoop
>>>>>>>
>>>>>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern 
>>>>>>> wrote:
>>>>>>>
>>>>>>>>  From what I can tell, there are two separate problems.
>>>>>>>> The document we have is a VTEP-VTEP monitoring document.  There is
>>>>>>>> no
>>>>>>>> need for that document to handle the multiple VNI case.
>>>>>>>> If folks want a protocol for doing BFD monitoring of things behind
>>>>>>>> the
>>>>>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>>>>>> encoding will be a tenant encoding, and thus sesparate from what is
>>>>>>>> defined in this document.
>>>>>>>>
>>>>>>>> Yours,
>>>>>>>> Joel
>>>>>>>>
>>>>>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>>>>>> > Santosh and others,
>>>>>>>> >
>>>>>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>>>>>> >>     Thanks for your explanation. This helps a lot. I would wait
>>>>>>>> for more
>>>>>>>> >> comments from others to see if this what we need in this draft
>>>>>>>> to be
>>>>>>>> >> supported based on that we can provide appropriate sections in
>>>>>>>> the draft.
>>>>>>>> >
>>>>>>>> > The threads on the list have spidered to the point where it is
>>>>>>>> challenging
>>>>>>>> > to follow what the current status of the draft is, or should be.
>>>>>>>> :-)
>>>>>>>> >
>>>>>>>> > However, if I've followed things properly, the question below is
>>>>>>>> really the
>>>>>>>> > hinge point on what our encapsulation for BFD over vxlan should
>>>>>>>> look like.
>>>>>>>> > Correct?
>>>>>>>> >
>>>>>>>> > Essentially, do we or do we not require the ability to permit
>>>>>>>> multiple BFD
>>>>>>>> > sessions between distinct VAPs?
>>>>>>>> >
>>>>>>>> > If this is so, do we have a sense as to how we should proceed?
>>>>>>>> >
>>>>>>>> > -- Jeff
>>>>>>>> >
>>>>>>>> > [context preserved below...]
>>>>>>>> >
>>>>>>>> >> Santosh P K
>>>>>>>> >>
>>>>>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>>>>>> >>
>>>>>>>> >>> Hi Santosh,
>>>>>>>> >>>
>>>>>>>> >>>
>>>>>>>> >>> With regard to the question whether we should allow multiple
>>>>>>>> BFD sessions
>>>>>>>> >>> for the same VNI or not, IMHO we should allow it, more
>>>>>>>> explanation as
>>>>>>>> >>> follows.
>>>>>>>> >>>
>>>>>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An
>>>>>>>> Architecture for
>>>>>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>>>> >>>
>>>>>>>> >>>                      |         Data Center Network (IP)        |
>>>>>>>> >>>                      |                                         |
>>>>>>>> >>>                      +-----------------------------------------+
>>>>>>>> >>>                           |                           |
>>>>>>>> >>>                           |       Tunnel Overlay      |
>>>>>>>> >>>              +------------+---------+
>>>>>>>>  +---------+------------+
>>>>>>>> >>>              | +----------+-------+ |       |
>>>>>>>> +-------+----------+ |
>>>>>>>> >>>              | |  Overlay Module  | |       | |  Overlay
>>>>>>>> Module  | |
>>>>>>>> >>>              | +---------+--------+ |       |
>>>>>>>> +---------+--------+ |
>>>>>>>> >>>              |           |          |       |           |
>>>>>>>>     |
>>>>>>>> >>>       NVE1   |           |          |       |           |
>>>>>>>>     | NVE2
>>>>>>>> >>>              |  +--------+-------+  |       |
>>>>>>>> +--------+-------+  |
>>>>>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2 VNI1
>>>>>>>> |  |
>>>>>>>> >>>              |  +-+-----+----+---+  |       |
>>>>>>>> +-+-----+-----+--+  |
>>>>>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     |
>>>>>>>> VAP3|
>>>>>>>> >>>              +----+-----+----+------+
>>>>>>>>  +----+-----+-----+-----+
>>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>>> >>>
>>>>>>>> -------+-----+----+-------------------+-----+-----+-------
>>>>>>>> >>>                   |     |    |     Tenant        |     |     |
>>>>>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|
>>>>>>>>  |TSI3
>>>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+
>>>>>>>>  +---+
>>>>>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|
>>>>>>>>  |TS6|
>>>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+
>>>>>>>>  +---+
>>>>>>>> >>>
>>>>>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2 are
>>>>>>>> actually
>>>>>>>> >>> initiated and terminated at VAP of NVE.
>>>>>>>> >>>
>>>>>>>> >>> If the network operator want to set up one BFD session between
>>>>>>>> VAP1 of
>>>>>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session
>>>>>>>> between VAP3 of
>>>>>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for
>>>>>>>> the same
>>>>>>>> >>> VNI1, I believe it's reasonable, so that's why I think we
>>>>>>>> should allow it
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> nvo3 mailing list
>>>>>>>> nvo3@ietf.org
>>>>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>>>>
>>>>>>>

--00000000000080c82c0595faea7c
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Santosh,

Does it have to be a MUST?=C2=
=A0 What if I am running IRB and there are IP addresses per VNI assigned to=
 the VTEPs?=C2=A0 Why can the operator not choose to use those?
<=
br>
Anoop

On Mon, Oct 28, 2019 at 7:51 AM Santosh P K <santosh.pallagatti@gmail.com<=
/a>> wrote:
<=
div dir=3D"ltr">
Dinesh, Anoop et all,
=C2=A0 =C2=A0 =C2=A0Le=
ts us know if this text works for 127/8 address range?

=

[proposed text for firewall]

"As per sec=
tion 4 inner destination IP address MUST be set to 127/8 address. There may=
 be firewall configured on VTEP to block 127/8 address range if set as dest=
ination IP in inner IP header. It is recommended to allow 127/8 range addre=
ss through firewall only if 127/8 IP address is set as destination address =
in inner IP header."


In s=
ection 4 we are talking about using 127/8 and not really giving reason why.=
 I think we should have text as RFC 5884 has mentioned with below text.

[From RFC 5884]
"   The motivation for using the address ran=
ge 127/8 is the same as=C2=A0specified in Section=
=C2=A02.1 of [RFC4379].  This is an exception to the=C2=A0behavior defined in [RFC1122].&=
quot;



Thanks
Santosh P K=C2=A0



On Thu, Oct 2=
4, 2019 at 1:24 AM Dinesh Dutt <didutt@gmail.com> wrote:
Looks good to me Greg. I s=
ee that the text around the use of the inner IP address as also quite accep=
table. Will you add any words about the firewall?

=
Dinesh

On Wed, Oct 23, 2019 at 8:36 PM, Greg =
Mirsky <gregi=
mirsky@gmail.com> wrote:
Hi Dinesh, et al.,
please check the updated version that removed the=
 reference to Hypervisor in the text and Figure 1.

Regards,
Greg

On Wed, Oct 23, 2019 at 10:47 AM Santosh P K =
<santo=
sh.pallagatti@gmail.com> wrote:
Dinesh,
=C2=A0 =C2=
=A0 =C2=A0Please see my inline=C2=A0comments [SPK]

- =
In section 3, there's a sentence that is: "BFD packets intended fo=
r a Hypervisor VTEP MUST NOT..". I recommend getting rid of the word &=
quot;Hypervisor" ashe logic applies to any VTEP.

<=
/div>
[SPK] Thanks for comments. We will change this.=C2=
=A0
=C2=A0
- You already explained the precedence of the use of 127/8 addr=
ess in the inner header in MPLS. I have no specific comments in that area. =
I have only two questions:=C2=A0
=C2=A0 =C2=A0- Has anybody verif=
ied that the use of 127/8 address (and the right MAC) works with existing i=
mplementations, including the silicon ones? If this doesn't work there,=
 is it worth adding the possibilit y of another address, one that is owned =
by the VTEP node?
=C2=A0 =C2=A0- Do we know if Firewalls stop such VXLAN pac=
kets? I ask this because VXLAN has an IP header and I don't know if fir=
ewalls stop packets with 127/8 in the inner header. If not, is it worth add=
ing a sentence to say that firewalls =C2=A0allow such packets? The use of a=
 non-127/8 address may alleviate this case as well.
=C2=A0
[SPK] I think we may need to add the text about fire=
wall as some checks in firewall will be there if they are not already using=
 MPLS OAM which has inner IP header with 127/8 address range.=C2=A0
=C2=A0

=

The rest of the draft looks good to me,

Dines=
h=C2=A0

On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dinesh,
=
I greatly appreciate your comments. Please heave a look at the attached cop=
y of the working version and its diff to -07 (latest in the datatracker).

Regards,
Greg

On Tue, Oct 22, 2019=
 at 9:52 PM Dinesh Dutt <didutt@gmail.com> wrote:
I have the same feeling =
as Anoop. Greg, can you please point me to the latest draft so that I can q=
uickly glance through it to be doubly sure,

Dinesh=


On Wed, Oct 23, 2019 at 4:35 AM, An=
oop Ghanwani <anoop@alumni.duke.edu> wrote:
Greg,

I think the draft is fine as is.

I discussion with Xiao Min was about #3 and I see that as =
unnecessary until we have a draft that explains why that is needed in the c=
ontext of the NVO3 architecture.

Anoop
=

On Tue=
, Oct 22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop, =
et al.,
I agree with your understanding of what is being defined in the=
 current version of the BFD over VxLAN specification. But, as I understand,=
 the WG is discussing the scope before the WGLC is closed. I believe there =
are three options:
  1. single BFD session between two VTEPs
  2. single BFD session per VNI between two VTEPs
  3. multiple BFD se=
ssions per VNI between two VTEPs
The current text reflects #2=
. Is WG accepts this scope? If not, which option WG would accept?

Regards,
Greg

On Tue, Oct 22, 2019 at =
2:09 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
I concur=
 with Joel's assessment with the following clarifications.

The current document is already capable of monitoring multiple VNIs =
between VTEPs.

The issue under discussion was how =
do we use BFD to monitor multiple VAPs that use the same VNI between a pair=
 of VTEPs.=C2=A0 The use case for this is not clear to me, as from my under=
standing, we cannot have a situation with multiple VAPs using the same VNI-=
-there is 1:1 mapping between VAP and VNI.

Anoop

On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
=C2=A0From what I =
can tell, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



_______________________________________________

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https://www.ietf.org/mailman/listinfo/nvo3















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In-Reply-To: 
From: Santosh P K 
Date: Mon, 28 Oct 2019 22:24:06 +0530
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani 
Cc: Dinesh Dutt , Greg Mirsky ,  "Joel M. Halpern" , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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--000000000000ba16220595fb59ce
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Anoop,
   You are right and Greg did remind me and it skipped my mind my bad.

[Current text in section 4.0]

      IP header:

         Destination IP: IP address MUST NOT be of one of tenant's IP
         addresses.  IP address MAY be selected from the range 127/8 for
         IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.


[proposed]


      IP header:

         Destination IP: IP address MUST NOT be of one of tenant's IP
         addresses.  IP address MAY be set to VTEP IP address or it
MAY be selected

         from the range 127/8 for IPv4, for IPv6 - from the range
0:0:0:0:0:FFFF:7F00:0/104.

                  The motivation for using the address range 127/8 is
the same as specified in Section 2.1 of [RFC4379]
.

         This is an exception to the behavior defined in [RFC1122
].



[proposed text for firewall]

"As per section 4 inner destination IP address MAY be set to 127/8 address.
There could be firewall configured on VTEP to block 127/8 address range if
set as destination IP in inner IP header. It is recommended to allow 127/8
range address through firewall only if inner IP header's destination IP is
set to 127/8 IP address."



Thanks

Santosh P K



On Mon, Oct 28, 2019 at 9:53 PM Anoop Ghanwani 
wrote:

> Santosh,
>
> Does it have to be a MUST?  What if I am running IRB and there are IP
> addresses per VNI assigned to the VTEPs?  Why can the operator not choose
> to use those?
>
> Anoop
>
> On Mon, Oct 28, 2019 at 7:51 AM Santosh P K 
> wrote:
>
>> Dinesh, Anoop et all,
>>      Lets us know if this text works for 127/8 address range?
>>
>> [proposed text for firewall]
>>
>> "As per section 4 inner destination IP address MUST be set to 127/8
>> address. There may be firewall configured on VTEP to block 127/8 address
>> range if set as destination IP in inner IP header. It is recommended to
>> allow 127/8 range address through firewall only if 127/8 IP address is set
>> as destination address in inner IP header."
>>
>>
>> In section 4 we are talking about using 127/8 and not really giving
>> reason why. I think we should have text as RFC 5884 has mentioned with
>> below text.
>>
>> [From RFC 5884]
>> " The motivation for using the address range 127/8 is the same as specified
>> in Section 2.1 of [RFC4379]
>> . This is an exception
>> to the behavior defined in [RFC1122 
>> ]."
>>
>>
>>
>> Thanks
>> Santosh P K
>>
>>
>>
>> On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt  wrote:
>>
>>> Looks good to me Greg. I see that the text around the use of the inner
>>> IP address as also quite acceptable. Will you add any words about the
>>> firewall?
>>>
>>> Dinesh
>>>
>>> On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky 
>>> wrote:
>>>
>>> Hi Dinesh, et al.,
>>> please check the updated version that removed the reference to
>>> Hypervisor in the text and Figure 1.
>>>
>>> Regards,
>>> Greg
>>>
>>> On Wed, Oct 23, 2019 at 10:47 AM Santosh P K <
>>> santosh.pallagatti@gmail.com> wrote:
>>>
>>>> Dinesh,
>>>>      Please see my inline comments [SPK]
>>>>
>>>>>
>>>>> - In section 3, there's a sentence that is: "BFD packets intended for
>>>>> a Hypervisor VTEP MUST NOT..". I recommend getting rid of the word
>>>>> "Hypervisor" ashe logic applies to any VTEP.
>>>>>
>>>>> [SPK] Thanks for comments. We will change this.
>>>>
>>>>
>>>>> - You already explained the precedence of the use of 127/8 address in
>>>>> the inner header in MPLS. I have no specific comments in that area. I have
>>>>> only two questions:
>>>>>    - Has anybody verified that the use of 127/8 address (and the right
>>>>> MAC) works with existing implementations, including the silicon ones? If
>>>>> this doesn't work there, is it worth adding the possibilit y of another
>>>>> address, one that is owned by the VTEP node?
>>>>>
>>>>    - Do we know if Firewalls stop such VXLAN packets? I ask this
>>>>> because VXLAN has an IP header and I don't know if firewalls stop packets
>>>>> with 127/8 in the inner header. If not, is it worth adding a sentence to
>>>>> say that firewalls  allow such packets? The use of a non-127/8 address may
>>>>> alleviate this case as well.
>>>>>
>>>>
>>>> [SPK] I think we may need to add the text about firewall as some checks
>>>> in firewall will be there if they are not already using MPLS OAM which has
>>>> inner IP header with 127/8 address range.
>>>>
>>>>
>>>>>
>>>>> The rest of the draft looks good to me,
>>>>>
>>>>> Dinesh
>>>>>
>>>>> On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky 
>>>>> wrote:
>>>>>
>>>>> Hi Dinesh,
>>>>> I greatly appreciate your comments. Please heave a look at the
>>>>> attached copy of the working version and its diff to -07 (latest in the
>>>>> datatracker).
>>>>>
>>>>> Regards,
>>>>> Greg
>>>>>
>>>>> On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:
>>>>>
>>>>>> I have the same feeling as Anoop. Greg, can you please point me to
>>>>>> the latest draft so that I can quickly glance through it to be doubly sure,
>>>>>>
>>>>>> Dinesh
>>>>>>
>>>>>> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani <
>>>>>> anoop@alumni.duke.edu> wrote:
>>>>>>
>>>>>> Greg,
>>>>>>
>>>>>> I think the draft is fine as is.
>>>>>>
>>>>>> I discussion with Xiao Min was about #3 and I see that as unnecessary
>>>>>> until we have a draft that explains why that is needed in the context of
>>>>>> the NVO3 architecture.
>>>>>>
>>>>>> Anoop
>>>>>>
>>>>>> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
>>>>>> wrote:
>>>>>>
>>>>>>> Hi Anoop, et al.,
>>>>>>> I agree with your understanding of what is being defined in the
>>>>>>> current version of the BFD over VxLAN specification. But, as I understand,
>>>>>>> the WG is discussing the scope before the WGLC is closed. I believe there
>>>>>>> are three options:
>>>>>>>
>>>>>>>    1. single BFD session between two VTEPs
>>>>>>>    2. single BFD session per VNI between two VTEPs
>>>>>>>    3. multiple BFD sessions per VNI between two VTEPs
>>>>>>>
>>>>>>> The current text reflects #2. Is WG accepts this scope? If not,
>>>>>>> which option WG would accept?
>>>>>>>
>>>>>>> Regards,
>>>>>>> Greg
>>>>>>>
>>>>>>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani <
>>>>>>> anoop@alumni.duke.edu> wrote:
>>>>>>>
>>>>>>>> I concur with Joel's assessment with the following clarifications.
>>>>>>>>
>>>>>>>> The current document is already capable of monitoring multiple VNIs
>>>>>>>> between VTEPs.
>>>>>>>>
>>>>>>>> The issue under discussion was how do we use BFD to monitor
>>>>>>>> multiple VAPs that use the same VNI between a pair of VTEPs.  The use case
>>>>>>>> for this is not clear to me, as from my understanding, we cannot have a
>>>>>>>> situation with multiple VAPs using the same VNI--there is 1:1 mapping
>>>>>>>> between VAP and VNI.
>>>>>>>>
>>>>>>>> Anoop
>>>>>>>>
>>>>>>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <
>>>>>>>> jmh@joelhalpern.com> wrote:
>>>>>>>>
>>>>>>>>>  From what I can tell, there are two separate problems.
>>>>>>>>> The document we have is a VTEP-VTEP monitoring document.  There is
>>>>>>>>> no
>>>>>>>>> need for that document to handle the multiple VNI case.
>>>>>>>>> If folks want a protocol for doing BFD monitoring of things behind
>>>>>>>>> the
>>>>>>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>>>>>>> encoding will be a tenant encoding, and thus sesparate from what
>>>>>>>>> is
>>>>>>>>> defined in this document.
>>>>>>>>>
>>>>>>>>> Yours,
>>>>>>>>> Joel
>>>>>>>>>
>>>>>>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>>>>>>> > Santosh and others,
>>>>>>>>> >
>>>>>>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>>>>>>> >>     Thanks for your explanation. This helps a lot. I would wait
>>>>>>>>> for more
>>>>>>>>> >> comments from others to see if this what we need in this draft
>>>>>>>>> to be
>>>>>>>>> >> supported based on that we can provide appropriate sections in
>>>>>>>>> the draft.
>>>>>>>>> >
>>>>>>>>> > The threads on the list have spidered to the point where it is
>>>>>>>>> challenging
>>>>>>>>> > to follow what the current status of the draft is, or should
>>>>>>>>> be.  :-)
>>>>>>>>> >
>>>>>>>>> > However, if I've followed things properly, the question below is
>>>>>>>>> really the
>>>>>>>>> > hinge point on what our encapsulation for BFD over vxlan should
>>>>>>>>> look like.
>>>>>>>>> > Correct?
>>>>>>>>> >
>>>>>>>>> > Essentially, do we or do we not require the ability to permit
>>>>>>>>> multiple BFD
>>>>>>>>> > sessions between distinct VAPs?
>>>>>>>>> >
>>>>>>>>> > If this is so, do we have a sense as to how we should proceed?
>>>>>>>>> >
>>>>>>>>> > -- Jeff
>>>>>>>>> >
>>>>>>>>> > [context preserved below...]
>>>>>>>>> >
>>>>>>>>> >> Santosh P K
>>>>>>>>> >>
>>>>>>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>>>>>>> >>
>>>>>>>>> >>> Hi Santosh,
>>>>>>>>> >>>
>>>>>>>>> >>>
>>>>>>>>> >>> With regard to the question whether we should allow multiple
>>>>>>>>> BFD sessions
>>>>>>>>> >>> for the same VNI or not, IMHO we should allow it, more
>>>>>>>>> explanation as
>>>>>>>>> >>> follows.
>>>>>>>>> >>>
>>>>>>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An
>>>>>>>>> Architecture for
>>>>>>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>>>>> >>>
>>>>>>>>> >>>                      |         Data Center Network (IP)
>>>>>>>>> |
>>>>>>>>> >>>                      |
>>>>>>>>>  |
>>>>>>>>> >>>
>>>>>>>>> +-----------------------------------------+
>>>>>>>>> >>>                           |                           |
>>>>>>>>> >>>                           |       Tunnel Overlay      |
>>>>>>>>> >>>              +------------+---------+
>>>>>>>>>  +---------+------------+
>>>>>>>>> >>>              | +----------+-------+ |       |
>>>>>>>>> +-------+----------+ |
>>>>>>>>> >>>              | |  Overlay Module  | |       | |  Overlay
>>>>>>>>> Module  | |
>>>>>>>>> >>>              | +---------+--------+ |       |
>>>>>>>>> +---------+--------+ |
>>>>>>>>> >>>              |           |          |       |           |
>>>>>>>>>     |
>>>>>>>>> >>>       NVE1   |           |          |       |           |
>>>>>>>>>     | NVE2
>>>>>>>>> >>>              |  +--------+-------+  |       |
>>>>>>>>> +--------+-------+  |
>>>>>>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2
>>>>>>>>> VNI1 |  |
>>>>>>>>> >>>              |  +-+-----+----+---+  |       |
>>>>>>>>> +-+-----+-----+--+  |
>>>>>>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|     |
>>>>>>>>> VAP3|
>>>>>>>>> >>>              +----+-----+----+------+
>>>>>>>>>  +----+-----+-----+-----+
>>>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>>>> >>>
>>>>>>>>> -------+-----+----+-------------------+-----+-----+-------
>>>>>>>>> >>>                   |     |    |     Tenant        |     |     |
>>>>>>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|
>>>>>>>>>  |TSI3
>>>>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+
>>>>>>>>>  +---+
>>>>>>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|
>>>>>>>>>  |TS6|
>>>>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+
>>>>>>>>>  +---+
>>>>>>>>> >>>
>>>>>>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2
>>>>>>>>> are actually
>>>>>>>>> >>> initiated and terminated at VAP of NVE.
>>>>>>>>> >>>
>>>>>>>>> >>> If the network operator want to set up one BFD session between
>>>>>>>>> VAP1 of
>>>>>>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session
>>>>>>>>> between VAP3 of
>>>>>>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for
>>>>>>>>> the same
>>>>>>>>> >>> VNI1, I believe it's reasonable, so that's why I think we
>>>>>>>>> should allow it
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> nvo3 mailing list
>>>>>>>>> nvo3@ietf.org
>>>>>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>>>>>
>>>>>>>>

--000000000000ba16220595fb59ce
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Anoop,
=C2=A0 =C2=A0You are right and Greg did remind =
me and it skipped my=C2=A0mind my bad.

[Current te=
xt in section 4.0]

      IP header:

         Destination IP: IP address MUST NOT be of one of tenant's IP
         addresses.  IP address MAY be selected from the range 127/8 for
         IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.

[proposed]

      IP header:

         Destination IP: IP address MUST NOT be of one of tenant's IP
         addresses.  IP address MAY be set to VTEP IP address or it MAY be =
selected 
         from the range 127/8 for IPv4,=
 for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
         
         The motivation for using the address range 127/8 is the same as=
=C2=A0specified in=C2=A0<=
a href=3D"https://tools.ietf.org/html/rfc4379#section-2.1" target=3D"_blank=
" style=3D"font-size:13.3333px">Section=C2=A02.1 of [RFC4379]. 
         This is an exception to the=C2=A0<=
span style=3D"font-size:13.3333px">behavior defined in [RFC1122].


[proposed text for firewall]

&qu=
ot;As per section 4 inner destination IP address MAY be set to 127/8 addres=
s. There could be firewall configured on VTEP to block 127/8 address range =
if set as destination IP in inner IP header. It is recommended to allow 127=
/8 range address through firewall only if inner IP header's destination=
 IP is set to 127/8 IP address."

<=
/pre>

Thanks
Santosh P K 


On Mon, Oct 28, 2019 at 9:53 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Santosh,

<=
/div>
Does it have to be a MUST?=C2=A0 What if I am running IRB and the=
re are IP addresses per VNI assigned to the VTEPs?=C2=A0 Why can the operat=
or not choose to use those?

Anoop

<=
div class=3D"gmail_quote">
On Mon, Oct=
 28, 2019 at 7:51 AM Santosh P K <santosh.pallagatti@gmail.com> wrote:
=

Dinesh, Anoop et all,
=C2=A0 =C2=A0 =C2=A0Lets us know if this=
 text works for 127/8 address range?

[proposed tex=
t for firewall]

"As per section 4 inner desti=
nation IP address MUST be set to 127/8 address. There may be firewall confi=
gured on VTEP to block 127/8 address range if set as destination IP in inne=
r IP header. It is recommended to allow 127/8 range address through firewal=
l only if 127/8 IP address is set as destination address in inner IP header=
."


In section 4 we are ta=
lking about using 127/8 and not really giving reason why. I think we should=
 have text as RFC 5884 has mentioned with below text.

<=
div>[From RFC 5884]
"   The motivation for using the address range 127/8 is the sa=
me as=C2=A0spec=
ified in Section=C2=A02.1 of [RFC43=
79].  This is an e=
xception to the=C2=A0behavior defined in [RFC1122]."



Thanks
Santosh P =
K=C2=A0



On Thu, Oct 24, 2019 at 1:24 AM =
Dinesh Dutt <didut=
t@gmail.com> wrote:
Looks good to me G=
reg. I see that the text around the use of the inner IP address as also qui=
te acceptable. Will you add any words about the firewall?

Dinesh

On =
Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dinesh, et al.,
please check t=
he updated version that removed the reference to Hypervisor in the text and=
 Figure 1.

Regards,
Greg

=

On Wed, Oc=
t 23, 2019 at 10:47 AM Santosh P K <santosh.pallagatti@gmail.com> wrote:
=

Dinesh,
=C2=A0 =C2=A0 =C2=A0Please see my inline=C2=A0commen=
ts [SPK]

- In section 3, t=
here's a sentence that is: "BFD packets intended for a Hypervisor =
VTEP MUST NOT..". I recommend getting rid of the word "Hypervisor=
" ashe logic applies to any VTEP.

[SPK] Thanks for comments. We will change this.=C2=A0
=C2=
=A0
- You already explained the precedence of the use of =
127/8 address in the inner header in MPLS. I have no specific comments in t=
hat area. I have only two questions:=C2=A0
=C2=A0 =C2=A0- Has any=
body verified that the use of 127/8 address (and the right MAC) works with =
existing implementations, including the silicon ones? If this doesn't w=
ork there, is it worth adding the possibilit y of another address, one that=
 is owned by the VTEP node?
=C2=A0 =C2=A0- Do we =
know if Firewalls stop such VXLAN packets? I ask this because VXLAN has an =
IP header and I don't know if firewalls stop packets with 127/8 in the =
inner header. If not, is it worth adding a sentence to say that firewalls =
=C2=A0allow such packets? The use of a non-127/8 address may alleviate this=
 case as well.
=C2=A0
[SPK] I think =
we may need to add the text about firewall as some checks in firewall will =
be there if they are not already using MPLS OAM which has inner IP header w=
ith 127/8 address range.=C2=A0
=C2=A0

The r=
est of the draft looks good to me,

Dinesh=C2=A0

On Wed, Oct 23, 2019 at 7:58 AM, Greg M=
irsky <gregim=
irsky@gmail.com> wrote:
Hi Dinesh,
I greatly appreciate your comments. Please heave a look at=
 the attached copy of the working version and its diff to -07 (latest in th=
e datatracker).

Regards,
Greg

On Tu=
e, Oct 22, 2019 at 9:52 PM Dinesh Dutt <didutt@gmail.com> wrote:
I have the same feeling as Anoop. Greg, can you please po=
int me to the latest draft so that I can quickly glance through it to be do=
ubly sure,

Dinesh

On Wed, Oct 23, 2019 at 4:35 AM, Anoop Gh=
anwani <anoop=
@alumni.duke.edu> wrote:
Greg,

I think the draft is fine as is.

=

I discussion with Xiao Min was about #3 and I see that as unnece=
ssary until we have a draft that explains why that is needed in the context=
 of the NVO3 architecture.

Anoop

On Tue, Oct =
22, 2019 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop, et al.=
,
I agree with your understanding of what is being defined in the curre=
nt version of the BFD over VxLAN specification. But, as I understand, the W=
G is discussing the scope before the WGLC is closed. I believe there are th=
ree options:
  1. single BFD session between two VTEPs
    2. single BFD session per VNI between two VTEPs
  2. multiple BFD sessions=
 per VNI between two VTEPs
The current text reflects #2. Is W=
G accepts this scope? If not, which option WG would accept?

Regards,
Greg

On Tue, Oct 22, 2019 at 2:09 P=
M Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
I concur with J=
oel's assessment with the following clarifications.

=
The current document is already capable of monitoring multiple VNIs between=
 VTEPs.

The issue under discussion was how do we u=
se BFD to monitor multiple VAPs that use the same VNI between a pair of VTE=
Ps.=C2=A0 The use case for this is not clear to me, as from my understandin=
g, we cannot have a situation with multiple VAPs using the same VNI--there =
is 1:1 mapping between VAP and VNI.

Anoop

On =
Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
=

=C2=A0From what I can tel=
l, there are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



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From: Anoop Ghanwani 
Date: Mon, 28 Oct 2019 10:21:09 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Santosh P K 
Cc: Dinesh Dutt , Greg Mirsky ,  "Joel M. Halpern" , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Santosh,

That looks better and I'd be OK with that.

However, I think it would be better if we did something like:

Destination IP: See Section xx.

Where section xx contains the complete description about setting the
destination IP including:
- Use of the underlay VTEP address for VNI 0.
- Use of overlay VTEP address for any other VNI.
- In the absence of available overlay VTEP address, use of 127/8 or IPv6
equivalent and a note about the firewall issue when using such addresses.

Also, I'm not enough of a firewall expert, but is the issue related to
firewalls running off the VTEP only, or are there firewalls that peek in
the inner header?  If there are the latter, then I think the text should be
more generic and just say something like "firewalls that examine the inner
header..." instead of "firewall running on the VTEP..." which is probably
not even technically correct, since the firewall doesn't run on the VTEP.

Anoop

On Mon, Oct 28, 2019 at 9:54 AM Santosh P K 
wrote:

> Anoop,
>    You are right and Greg did remind me and it skipped my mind my bad.
>
> [Current text in section 4.0]
>
>       IP header:
>
>          Destination IP: IP address MUST NOT be of one of tenant's IP
>          addresses.  IP address MAY be selected from the range 127/8 for
>          IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
>
>
> [proposed]
>
>
>       IP header:
>
>          Destination IP: IP address MUST NOT be of one of tenant's IP
>          addresses.  IP address MAY be set to VTEP IP address or it MAY be selected
>
>          from the range 127/8 for IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
>
>                   The motivation for using the address range 127/8 is the same as specified in Section 2.1 of [RFC4379] .
>
>          This is an exception to the behavior defined in [RFC1122 ].
>
>
>
> [proposed text for firewall]
>
> "As per section 4 inner destination IP address MAY be set to 127/8
> address. There could be firewall configured on VTEP to block 127/8 address
> range if set as destination IP in inner IP header. It is recommended to
> allow 127/8 range address through firewall only if inner IP header's
> destination IP is set to 127/8 IP address."
>
>
>
> Thanks
>
> Santosh P K
>
>
>
> On Mon, Oct 28, 2019 at 9:53 PM Anoop Ghanwani 
> wrote:
>
>> Santosh,
>>
>> Does it have to be a MUST?  What if I am running IRB and there are IP
>> addresses per VNI assigned to the VTEPs?  Why can the operator not choose
>> to use those?
>>
>> Anoop
>>
>> On Mon, Oct 28, 2019 at 7:51 AM Santosh P K 
>> wrote:
>>
>>> Dinesh, Anoop et all,
>>>      Lets us know if this text works for 127/8 address range?
>>>
>>> [proposed text for firewall]
>>>
>>> "As per section 4 inner destination IP address MUST be set to 127/8
>>> address. There may be firewall configured on VTEP to block 127/8 address
>>> range if set as destination IP in inner IP header. It is recommended to
>>> allow 127/8 range address through firewall only if 127/8 IP address is set
>>> as destination address in inner IP header."
>>>
>>>
>>> In section 4 we are talking about using 127/8 and not really giving
>>> reason why. I think we should have text as RFC 5884 has mentioned with
>>> below text.
>>>
>>> [From RFC 5884]
>>> " The motivation for using the address range 127/8 is the same as specified
>>> in Section 2.1 of [RFC4379]
>>> . This is an exception
>>> to the behavior defined in [RFC1122
>>> ]."
>>>
>>>
>>>
>>> Thanks
>>> Santosh P K
>>>
>>>
>>>
>>> On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt  wrote:
>>>
>>>> Looks good to me Greg. I see that the text around the use of the inner
>>>> IP address as also quite acceptable. Will you add any words about the
>>>> firewall?
>>>>
>>>> Dinesh
>>>>
>>>> On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky 
>>>> wrote:
>>>>
>>>> Hi Dinesh, et al.,
>>>> please check the updated version that removed the reference to
>>>> Hypervisor in the text and Figure 1.
>>>>
>>>> Regards,
>>>> Greg
>>>>
>>>> On Wed, Oct 23, 2019 at 10:47 AM Santosh P K <
>>>> santosh.pallagatti@gmail.com> wrote:
>>>>
>>>>> Dinesh,
>>>>>      Please see my inline comments [SPK]
>>>>>
>>>>>>
>>>>>> - In section 3, there's a sentence that is: "BFD packets intended for
>>>>>> a Hypervisor VTEP MUST NOT..". I recommend getting rid of the word
>>>>>> "Hypervisor" ashe logic applies to any VTEP.
>>>>>>
>>>>>> [SPK] Thanks for comments. We will change this.
>>>>>
>>>>>
>>>>>> - You already explained the precedence of the use of 127/8 address in
>>>>>> the inner header in MPLS. I have no specific comments in that area. I have
>>>>>> only two questions:
>>>>>>    - Has anybody verified that the use of 127/8 address (and the
>>>>>> right MAC) works with existing implementations, including the silicon ones?
>>>>>> If this doesn't work there, is it worth adding the possibilit y of another
>>>>>> address, one that is owned by the VTEP node?
>>>>>>
>>>>>    - Do we know if Firewalls stop such VXLAN packets? I ask this
>>>>>> because VXLAN has an IP header and I don't know if firewalls stop packets
>>>>>> with 127/8 in the inner header. If not, is it worth adding a sentence to
>>>>>> say that firewalls  allow such packets? The use of a non-127/8 address may
>>>>>> alleviate this case as well.
>>>>>>
>>>>>
>>>>> [SPK] I think we may need to add the text about firewall as some
>>>>> checks in firewall will be there if they are not already using MPLS OAM
>>>>> which has inner IP header with 127/8 address range.
>>>>>
>>>>>
>>>>>>
>>>>>> The rest of the draft looks good to me,
>>>>>>
>>>>>> Dinesh
>>>>>>
>>>>>> On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky 
>>>>>> wrote:
>>>>>>
>>>>>> Hi Dinesh,
>>>>>> I greatly appreciate your comments. Please heave a look at the
>>>>>> attached copy of the working version and its diff to -07 (latest in the
>>>>>> datatracker).
>>>>>>
>>>>>> Regards,
>>>>>> Greg
>>>>>>
>>>>>> On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt  wrote:
>>>>>>
>>>>>>> I have the same feeling as Anoop. Greg, can you please point me to
>>>>>>> the latest draft so that I can quickly glance through it to be doubly sure,
>>>>>>>
>>>>>>> Dinesh
>>>>>>>
>>>>>>> On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani <
>>>>>>> anoop@alumni.duke.edu> wrote:
>>>>>>>
>>>>>>> Greg,
>>>>>>>
>>>>>>> I think the draft is fine as is.
>>>>>>>
>>>>>>> I discussion with Xiao Min was about #3 and I see that as
>>>>>>> unnecessary until we have a draft that explains why that is needed in the
>>>>>>> context of the NVO3 architecture.
>>>>>>>
>>>>>>> Anoop
>>>>>>>
>>>>>>> On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky 
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Hi Anoop, et al.,
>>>>>>>> I agree with your understanding of what is being defined in the
>>>>>>>> current version of the BFD over VxLAN specification. But, as I understand,
>>>>>>>> the WG is discussing the scope before the WGLC is closed. I believe there
>>>>>>>> are three options:
>>>>>>>>
>>>>>>>>    1. single BFD session between two VTEPs
>>>>>>>>    2. single BFD session per VNI between two VTEPs
>>>>>>>>    3. multiple BFD sessions per VNI between two VTEPs
>>>>>>>>
>>>>>>>> The current text reflects #2. Is WG accepts this scope? If not,
>>>>>>>> which option WG would accept?
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> Greg
>>>>>>>>
>>>>>>>> On Tue, Oct 22, 2019 at 2:09 PM Anoop Ghanwani <
>>>>>>>> anoop@alumni.duke.edu> wrote:
>>>>>>>>
>>>>>>>>> I concur with Joel's assessment with the following clarifications.
>>>>>>>>>
>>>>>>>>> The current document is already capable of monitoring multiple
>>>>>>>>> VNIs between VTEPs.
>>>>>>>>>
>>>>>>>>> The issue under discussion was how do we use BFD to monitor
>>>>>>>>> multiple VAPs that use the same VNI between a pair of VTEPs.  The use case
>>>>>>>>> for this is not clear to me, as from my understanding, we cannot have a
>>>>>>>>> situation with multiple VAPs using the same VNI--there is 1:1 mapping
>>>>>>>>> between VAP and VNI.
>>>>>>>>>
>>>>>>>>> Anoop
>>>>>>>>>
>>>>>>>>> On Tue, Oct 22, 2019 at 6:06 AM Joel M. Halpern <
>>>>>>>>> jmh@joelhalpern.com> wrote:
>>>>>>>>>
>>>>>>>>>>  From what I can tell, there are two separate problems.
>>>>>>>>>> The document we have is a VTEP-VTEP monitoring document.  There
>>>>>>>>>> is no
>>>>>>>>>> need for that document to handle the multiple VNI case.
>>>>>>>>>> If folks want a protocol for doing BFD monitoring of things
>>>>>>>>>> behind the
>>>>>>>>>> VTEPs (multiple VNIs), then do that as a separate document.   The
>>>>>>>>>> encoding will be a tenant encoding, and thus sesparate from what
>>>>>>>>>> is
>>>>>>>>>> defined in this document.
>>>>>>>>>>
>>>>>>>>>> Yours,
>>>>>>>>>> Joel
>>>>>>>>>>
>>>>>>>>>> On 10/21/2019 5:07 PM, Jeffrey Haas wrote:
>>>>>>>>>> > Santosh and others,
>>>>>>>>>> >
>>>>>>>>>> > On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:
>>>>>>>>>> >>     Thanks for your explanation. This helps a lot. I would
>>>>>>>>>> wait for more
>>>>>>>>>> >> comments from others to see if this what we need in this draft
>>>>>>>>>> to be
>>>>>>>>>> >> supported based on that we can provide appropriate sections in
>>>>>>>>>> the draft.
>>>>>>>>>> >
>>>>>>>>>> > The threads on the list have spidered to the point where it is
>>>>>>>>>> challenging
>>>>>>>>>> > to follow what the current status of the draft is, or should
>>>>>>>>>> be.  :-)
>>>>>>>>>> >
>>>>>>>>>> > However, if I've followed things properly, the question below
>>>>>>>>>> is really the
>>>>>>>>>> > hinge point on what our encapsulation for BFD over vxlan should
>>>>>>>>>> look like.
>>>>>>>>>> > Correct?
>>>>>>>>>> >
>>>>>>>>>> > Essentially, do we or do we not require the ability to permit
>>>>>>>>>> multiple BFD
>>>>>>>>>> > sessions between distinct VAPs?
>>>>>>>>>> >
>>>>>>>>>> > If this is so, do we have a sense as to how we should proceed?
>>>>>>>>>> >
>>>>>>>>>> > -- Jeff
>>>>>>>>>> >
>>>>>>>>>> > [context preserved below...]
>>>>>>>>>> >
>>>>>>>>>> >> Santosh P K
>>>>>>>>>> >>
>>>>>>>>>> >> On Wed, Sep 25, 2019 at 8:10 AM  wrote:
>>>>>>>>>> >>
>>>>>>>>>> >>> Hi Santosh,
>>>>>>>>>> >>>
>>>>>>>>>> >>>
>>>>>>>>>> >>> With regard to the question whether we should allow multiple
>>>>>>>>>> BFD sessions
>>>>>>>>>> >>> for the same VNI or not, IMHO we should allow it, more
>>>>>>>>>> explanation as
>>>>>>>>>> >>> follows.
>>>>>>>>>> >>>
>>>>>>>>>> >>> Below is a figure derived from figure 2 of RFC8014 (An
>>>>>>>>>> Architecture for
>>>>>>>>>> >>> Data-Center Network Virtualization over Layer 3 (NVO3)).
>>>>>>>>>> >>>
>>>>>>>>>> >>>                      |         Data Center Network (IP)
>>>>>>>>>>   |
>>>>>>>>>> >>>                      |
>>>>>>>>>>  |
>>>>>>>>>> >>>
>>>>>>>>>> +-----------------------------------------+
>>>>>>>>>> >>>                           |                           |
>>>>>>>>>> >>>                           |       Tunnel Overlay      |
>>>>>>>>>> >>>              +------------+---------+
>>>>>>>>>>  +---------+------------+
>>>>>>>>>> >>>              | +----------+-------+ |       |
>>>>>>>>>> +-------+----------+ |
>>>>>>>>>> >>>              | |  Overlay Module  | |       | |  Overlay
>>>>>>>>>> Module  | |
>>>>>>>>>> >>>              | +---------+--------+ |       |
>>>>>>>>>> +---------+--------+ |
>>>>>>>>>> >>>              |           |          |       |           |
>>>>>>>>>>       |
>>>>>>>>>> >>>       NVE1   |           |          |       |           |
>>>>>>>>>>       | NVE2
>>>>>>>>>> >>>              |  +--------+-------+  |       |
>>>>>>>>>> +--------+-------+  |
>>>>>>>>>> >>>              |  |VNI1 VNI2  VNI1 |  |       |  | VNI1 VNI2
>>>>>>>>>> VNI1 |  |
>>>>>>>>>> >>>              |  +-+-----+----+---+  |       |
>>>>>>>>>> +-+-----+-----+--+  |
>>>>>>>>>> >>>              |VAP1| VAP2|    | VAP3 |       |VAP1| VAP2|
>>>>>>>>>>  | VAP3|
>>>>>>>>>> >>>              +----+-----+----+------+
>>>>>>>>>>  +----+-----+-----+-----+
>>>>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>>>>> >>>                   |     |    |                   |     |     |
>>>>>>>>>> >>>
>>>>>>>>>> -------+-----+----+-------------------+-----+-----+-------
>>>>>>>>>> >>>                   |     |    |     Tenant        |     |     |
>>>>>>>>>> >>>              TSI1 | TSI2|    | TSI3          TSI1| TSI2|
>>>>>>>>>>  |TSI3
>>>>>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+
>>>>>>>>>>  +---+
>>>>>>>>>> >>>                  |TS1| |TS2| |TS3|             |TS4| |TS5|
>>>>>>>>>>  |TS6|
>>>>>>>>>> >>>                  +---+ +---+ +---+             +---+ +---+
>>>>>>>>>>  +---+
>>>>>>>>>> >>>
>>>>>>>>>> >>> To my understanding, the BFD sessions between NVE1 and NVE2
>>>>>>>>>> are actually
>>>>>>>>>> >>> initiated and terminated at VAP of NVE.
>>>>>>>>>> >>>
>>>>>>>>>> >>> If the network operator want to set up one BFD session
>>>>>>>>>> between VAP1 of
>>>>>>>>>> >>> NVE1 and VAP1of NVE2, at the same time another BFD session
>>>>>>>>>> between VAP3 of
>>>>>>>>>> >>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for
>>>>>>>>>> the same
>>>>>>>>>> >>> VNI1, I believe it's reasonable, so that's why I think we
>>>>>>>>>> should allow it
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> nvo3 mailing list
>>>>>>>>>> nvo3@ietf.org
>>>>>>>>>> https://www.ietf.org/mailman/listinfo/nvo3
>>>>>>>>>>
>>>>>>>>>

--0000000000004ed4770595fbba3b
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Santosh,

That looks=
 better and I'd be OK with that.

However, I th=
ink it would be better if we did something like:
Destination IP: See Section xx.
Where section xx cont=
ains the complete description about setting the destination IP including:
- Use of the underlay VTEP address for VNI 0.
- Use of o=
verlay VTEP address for any other VNI.
- In the absence of availa=
ble overlay VTEP address, use of 127/8 or IPv6 equivalent and a note about =
the firewall issue when using such addresses.=C2=A0=C2=A0

Also, I'm not enough of a firewall expert, but is the issue rel=
ated to firewalls running off the VTEP only, or are there firewalls that pe=
ek in the inner header?=C2=A0 If there are the latter, then I think the tex=
t should be more generic and just say something like "firewalls that e=
xamine the inner header..." instead of "firewall running on the V=
TEP..." which is probably not even technically correct, since the fire=
wall doesn't run on the VTEP.

Anoop

On Mo=
n, Oct 28, 2019 at 9:54 AM Santosh P K <santosh.pallagatti@gmail.com> wrote:
Anoop,
=C2=
=A0 =C2=A0You are right and Greg did remind me and it skipped my=C2=A0mind =
my bad.

[Current text in section 4.0]
      IP header:

         Destination IP: IP address MUST NOT be of one of tenant's IP
         addresses.  IP address MAY be selected from the range 127/8 for
         IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.

[proposed]

      IP header:

         Destination IP: IP address MUST NOT be of one of tenant's IP
         addresses.  IP address MAY be set to VTEP IP address or it MAY be =
selected 
         from the range 127/8 for IPv4, for IPv6 - from the range 0:0:=
0:0:0:FFFF:7F00:0/104.
         
         The mot=
ivation for using the address range 127/8 is the same as=C2=A0specified in=C2=A0Section=C2=A02.1 of [RFC4379]. 
         This is an excepti=
on to the=C2=A0behavior defined =
in [RFC1122].


[pr=
oposed text for firewall]

=

"As per section 4 inner destination =
IP address MAY be set to 127/8 address. There could be firewall configured =
on VTEP to block 127/8 address range if set as destination IP in inner IP h=
eader. It is recommended to allow 127/8 range address through firewall only=
 if inner IP header's destination IP is set to 127/8 IP address."<=
/div>


Thanks
Santosh P K 


On Mon, Oct 28, 2019 at 9:53 PM Anoop Ghan=
wani <anoop@a=
lumni.duke.edu> wrote:
Santosh,

Does it have to =
be a MUST?=C2=A0 What if I am running IRB and there are IP addresses per VN=
I assigned to the VTEPs?=C2=A0 Why can the operator not choose to use those=
?

Anoop

=

On Mon, Oct 28, 2019 at 7:51 AM Santo=
sh P K <santosh.pallagatti@gmail.com> wrote:
Dinesh, Anoop et all,
=C2=A0 =C2=A0 =C2=A0Lets us know if this text works for 127/8 addr=
ess range?

[proposed text for firewall]
=

"As per section 4 inner destination IP address MUST be =
set to 127/8 address. There may be firewall configured on VTEP to block 127=
/8 address range if set as destination IP in inner IP header. It is recomme=
nded to allow 127/8 range address through firewall only if 127/8 IP address=
 is set as destination address in inner IP header."


In section 4 we are talking about using 127/8 an=
d not really giving reason why. I think we should have text as RFC 5884 has=
 mentioned with below text.

[From RFC 5884]
<=
div>"   The motiv=
ation for using the address range 127/8 is the same as=C2=A0specified in Section=C2=A02.1 of [RFC4379].  This is an exception to the=C2=A0behavior defined in =
[RFC1122]."



Thanks
Santosh P K=C2=A0



On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt <didutt@gmail.com> wrote:=

Looks good to me =
Greg. I see that the text around the use of the inner IP address as also qu=
ite acceptable. Will you add any words about the firewall?

Dinesh

On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky <<=
a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail=
.com> wrote:
Hi Dinesh=
, et al.,
please check the updated version that removed the reference t=
o Hypervisor in the text and Figure 1.

Regards,
Greg

On Wed, Oct 23, 2019 at 10:47 AM Santosh P K <santosh.pallagat=
ti@gmail.com> wrote:
Dinesh,
=C2=A0 =C2=A0 =C2=A0Ple=
ase see my inline=C2=A0comments [SPK]

- In section 3, there's a senten=
ce that is: "BFD packets intended for a Hypervisor VTEP MUST NOT..&quo=
t;. I recommend getting rid of the word "Hypervisor" ashe logic a=
pplies to any VTEP.

[SPK] Thank=
s for comments. We will change this.=C2=A0
=C2=A0
- You already explained the precedence of the=
 use of 127/8 address in the inner header in MPLS. I have no specific comme=
nts in that area. I have only two questions:=C2=A0
=C2=A0 =C2=A0-=
 Has anybody verified that the use of 127/8 address (and the right MAC) wor=
ks with existing implementations, including the silicon ones? If this doesn=
't work there, is it worth adding the possibilit y of another address, =
one that is owned by the VTEP node?
=C2=A0 =C2=A0- Do we know if Firewalls stop such VXLAN packe=
ts? I ask this because VXLAN has an IP header and I don't know if firew=
alls stop packets with 127/8 in the inner header. If not, is it worth addin=
g a sentence to say that firewalls =C2=A0allow such packets? The use of a n=
on-127/8 address may alleviate this case as well.
<=
div>=C2=A0
[SPK] I think we may need to add the text about firewa=
ll as some checks in firewall will be there if they are not already using M=
PLS OAM which has inner IP header with 127/8 address range.=C2=A0
=C2=A0

The rest of the dr=
aft looks good to me,

Dinesh=C2=A0

On Wed, Oct 23, 2019 at 7=
:58 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
<=
div dir=3D"ltr">Hi Dinesh,
I greatly appreciate your comments. Please h=
eave a look at the attached copy of the working version and its diff to -07=
 (latest in the datatracker).

Regards,
G=
reg

On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt <didutt@gmail.com> wrote:
I have the same =
feeling as Anoop. Greg, can you please point me to the latest draft so that=
 I can quickly glance through it to be doubly sure,

Dinesh

On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani =
<anoop@alumni=
.duke.edu> wrote:
Greg=
,

I think the draft is fine as is.

<=
div>I discussion with Xiao Min was about #3 and I see that as unnecessary u=
ntil we have a draft that explains why that is needed in the context of the=
 NVO3 architecture.

Anoop

On Tue, Oct 22, 201=
9 at 11:17 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop, et al.,
I=
 agree with your understanding of what is being defined in the current vers=
ion of the BFD over VxLAN specification. But, as I understand, the WG is di=
scussing the scope before the WGLC is closed. I believe there are three opt=
ions:
  1. single BFD session between two VTEPs
  2. single=
 BFD session per VNI between two VTEPs
  3. multiple BFD sessions per VN=
I between two VTEPs
The current text reflects #2. Is WG accep=
ts this scope? If not, which option WG would accept?

Regards,
Greg

=

On Tue, Oct 22, 2019 at 2:09 PM Anoop=
 Ghanwani <an=
oop@alumni.duke.edu> wrote:
I concur with Joel'=
;s assessment with the following clarifications.

The cur=
rent document is already capable of monitoring multiple VNIs between VTEPs.=


The issue under discussion was how do we use BFD =
to monitor multiple VAPs that use the same VNI between a pair of VTEPs.=C2=
=A0 The use case for this is not clear to me, as from my understanding, we =
cannot have a situation with multiple VAPs using the same VNI--there is 1:1=
 mapping between VAP and VNI.

Anoop
On Tue, O=
ct 22, 2019 at 6:06 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
=C2=A0From what I can tell, the=
re are two separate problems.

The document we have is a VTEP-VTEP monitoring document.=C2=A0 There is no =


need for that document to handle the multiple VNI case.

If folks want a protocol for doing BFD monitoring of things behind the 

VTEPs (multiple VNIs), then do that as a separate document.=C2=A0 =C2=A0The=
 

encoding will be a tenant encoding, and thus sesparate from what is 

defined in this document.



Yours,

Joel



On 10/21/2019 5:07 PM, Jeffrey Haas wrote:

> Santosh and others,

> 

> On Thu, Oct 03, 2019 at 07:50:20PM +0530, Santosh P K wrote:

>>=C2=A0 =C2=A0 =C2=A0Thanks for your explanation. This helps a lot. =
I would wait for more

>> comments from others to see if this what we need in this draft to =
be

>> supported based on that we can provide appropriate sections in the=
 draft.

> 

> The threads on the list have spidered to the point where it is challen=
ging

> to follow what the current status of the draft is, or should be.=C2=A0=
 :-)

> 

> However, if I've followed things properly, the question below is r=
eally the

> hinge point on what our encapsulation for BFD over vxlan should look l=
ike.

> Correct?

> 

> Essentially, do we or do we not require the ability to permit multiple=
 BFD

> sessions between distinct VAPs?

> 

> If this is so, do we have a sense as to how we should proceed?

> 

> -- Jeff

> 

> [context preserved below...]

> 

>> Santosh P K

>>

>> On Wed, Sep 25, 2019 at 8:10 AM <xiao.min2@zte.com.cn> wrote:

>>

>>> Hi Santosh,

>>>

>>>

>>> With regard to the question whether we should allow multiple B=
FD sessions

>>> for the same VNI or not, IMHO we should allow it, more explana=
tion as

>>> follows.

>>>

>>> Below is a figure derived from figure 2 of RFC8014 (An Archite=
cture for

>>> Data-Center Network Virtualization over Layer 3 (NVO3)).

>>>

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Data Center Network (IP)=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------------------------------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Overla=
y=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +------------+=
---------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+------------+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +----------+=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +-------+----------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | |=C2=A0 Over=
lay Module=C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 Overlay Module=C2=
=A0 | |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | +---------+-=
-------+ |=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+--------+ |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0NVE1=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 | NVE2

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-----=
---+-------+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +--------+-------+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 |VNI1 =
VNI2=C2=A0 VNI1 |=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 | VNI1 VNI2 VNI=
1 |=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 +-+---=
--+----+---+=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 +-+-----+-----+--+=
=C2=A0 |

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |VAP1| VAP2|=
=C2=A0 =C2=A0 | VAP3 |=C2=A0 =C2=A0 =C2=A0 =C2=A0|VAP1| VAP2|=C2=A0 =C2=A0 =
=C2=A0| VAP3|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +----+-----+--=
--+------+=C2=A0 =C2=A0 =C2=A0 =C2=A0+----+-----+-----+-----+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -------+-----+----+--=
-----------------+-----+-----+-------

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0|=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0Tenant=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1 | TSI2|=
=C2=A0 =C2=A0 | TSI3=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TSI1| TSI2|=C2=A0 =
=C2=A0 =C2=A0|TSI3

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
|TS1| |TS2| |TS3|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS4| |TS5=
|=C2=A0 =C2=A0|TS6|

>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
+---+ +---+ +---+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ +---=
+=C2=A0 =C2=A0+---+

>>>

>>> To my understanding, the BFD sessions between NVE1 and NVE2 ar=
e actually

>>> initiated and terminated at VAP of NVE.

>>>

>>> If the network operator want to set up one BFD session between=
 VAP1 of

>>> NVE1 and VAP1of NVE2, at the same time another BFD session bet=
ween VAP3 of

>>> NVE1 and VAP3 of NVE2, although the two BFD sessions are for t=
he same

>>> VNI1, I believe it's reasonable, so that's why I think=
 we should allow it



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From nobody Mon Oct 28 11:38:40 2019
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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani , Santosh P K 
Cc: Dinesh Dutt , Greg Mirsky , Jeffrey Haas , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
References:  <201909251039413767352@zte.com.cn>  <20191021210752.GA8916@pfrc.org> <0e99a541-b2ca-85d4-4a8f-1165cf7ac01e@joelhalpern.com>    <1571795542.10436.5@smtp.gmail.com>  <1571798869.2855.1@smtp.gmail.com>   <1571860470.2855.11@smtp.gmail.com>  
From: "Joel M. Halpern" 
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Date: Mon, 28 Oct 2019 13:22:09 -0400
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There is something I am missing in your assumption about IRB.

As I understand VxLAN, the VTEP is under the control of the operator. 
As such, it is a pure bridge.  If you run IRB behind it, that is fine. 
Yes, an operator may offer IRB.  But as I understand it,  conceptually, 
in terms of the VxLAN architecture the IRB is an entity behind the VTEP, 
not part of the VTEP.

Yours,
Joel

On 10/28/2019 12:23 PM, Anoop Ghanwani wrote:
> Santosh,
> 
> Does it have to be a MUST?  What if I am running IRB and there are IP 
> addresses per VNI assigned to the VTEPs?  Why can the operator not 
> choose to use those?
> 
> Anoop
> 
> On Mon, Oct 28, 2019 at 7:51 AM Santosh P K 
> > wrote:
> 
>     Dinesh, Anoop et all,
>           Lets us know if this text works for 127/8 address range?
> 
>     [proposed text for firewall]
> 
>     "As per section 4 inner destination IP address MUST be set to 127/8
>     address. There may be firewall configured on VTEP to block 127/8
>     address range if set as destination IP in inner IP header. It is
>     recommended to allow 127/8 range address through firewall only if
>     127/8 IP address is set as destination address in inner IP header."
> 
> 
>     In section 4 we are talking about using 127/8 and not really giving
>     reason why. I think we should have text as RFC 5884 has mentioned
>     with below text.
> 
>     [From RFC 5884]
>     "The motivation for using the address range 127/8 is the same as
>     specified in Section 2.1 of [RFC4379]
>     . This is an
>     exception to the behavior defined in [RFC1122
>     ]."
> 
> 
> 
>     Thanks
>     Santosh P K
> 
> 
> 
>     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt      > wrote:
> 
>         Looks good to me Greg. I see that the text around the use of the
>         inner IP address as also quite acceptable. Will you add any
>         words about the firewall?
> 
>         Dinesh
> 
>         On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky
>         > wrote:
>>         Hi Dinesh, et al.,
>>         please check the updated version that removed the reference to
>>         Hypervisor in the text and Figure 1.
>>
>>         Regards,
>>         Greg
>>
>>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K
>>         >         > wrote:
>>
>>             Dinesh,
>>                  Please see my inline comments [SPK]
>>
>>
>>                 - In section 3, there's a sentence that is: "BFD
>>                 packets intended for a Hypervisor VTEP MUST NOT..". I
>>                 recommend getting rid of the word "Hypervisor" ashe
>>                 logic applies to any VTEP.
>>
>>             [SPK] Thanks for comments. We will change this.
>>
>>                 - You already explained the precedence of the use of
>>                 127/8 address in the inner header in MPLS. I have no
>>                 specific comments in that area. I have only two
>>                 questions:
>>                    - Has anybody verified that the use of 127/8
>>                 address (and the right MAC) works with existing
>>                 implementations, including the silicon ones? If this
>>                 doesn't work there, is it worth adding the possibilit
>>                 y of another address, one that is owned by the VTEP node?
>>
>>                    - Do we know if Firewalls stop such VXLAN packets?
>>                 I ask this because VXLAN has an IP header and I don't
>>                 know if firewalls stop packets with 127/8 in the inner
>>                 header. If not, is it worth adding a sentence to say
>>                 that firewalls  allow such packets? The use of a
>>                 non-127/8 address may alleviate this case as well.
>>
>>             [SPK] I think we may need to add the text about firewall
>>             as some checks in firewall will be there if they are not
>>             already using MPLS OAM which has inner IP header with
>>             127/8 address range.
>>
>>
>>                 The rest of the draft looks good to me,
>>
>>                 Dinesh
>>
>>                 On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky
>>                 >
>>                 wrote:
>>>                 Hi Dinesh,
>>>                 I greatly appreciate your comments. Please heave a
>>>                 look at the attached copy of the working version and
>>>                 its diff to -07 (latest in the datatracker).
>>>
>>>                 Regards,
>>>                 Greg
>>>
>>>                 On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt
>>>                 > wrote:
>>>
>>>                     I have the same feeling as Anoop. Greg, can you
>>>                     please point me to the latest draft so that I can
>>>                     quickly glance through it to be doubly sure,
>>>
>>>                     Dinesh
>>>
>>>                     On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani
>>>                     >>                     > wrote:
>>>>                     Greg,
>>>>
>>>>                     I think the draft is fine as is.
>>>>
>>>>                     I discussion with Xiao Min was about #3 and I
>>>>                     see that as unnecessary until we have a draft
>>>>                     that explains why that is needed in the context
>>>>                     of the NVO3 architecture.
>>>>
>>>>                     Anoop
>>>>
>>>>                     On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky
>>>>                     >>>                     > wrote:
>>>>
>>>>                         Hi Anoop, et al.,
>>>>                         I agree with your understanding of what is
>>>>                         being defined in the current version of the
>>>>                         BFD over VxLAN specification. But, as I
>>>>                         understand, the WG is discussing the scope
>>>>                         before the WGLC is closed. I believe there
>>>>                         are three options:
>>>>
>>>>                          1. single BFD session between two VTEPs
>>>>                          2. single BFD session per VNI between two VTEPs
>>>>                          3. multiple BFD sessions per VNI between
>>>>                             two VTEPs
>>>>
>>>>                         The current text reflects #2. Is WG accepts
>>>>                         this scope? If not, which option WG would
>>>>                         accept?
>>>>
>>>>                         Regards,
>>>>                         Greg
>>>>
>>>>                         On Tue, Oct 22, 2019 at 2:09 PM Anoop
>>>>                         Ghanwani >>>                         > wrote:
>>>>
>>>>                             I concur with Joel's assessment with the
>>>>                             following clarifications.
>>>>
>>>>                             The current document is already capable
>>>>                             of monitoring multiple VNIs between VTEPs.
>>>>
>>>>                             The issue under discussion was how do we
>>>>                             use BFD to monitor multiple VAPs that
>>>>                             use the same VNI between a pair of
>>>>                             VTEPs.  The use case for this is not
>>>>                             clear to me, as from my understanding,
>>>>                             we cannot have a situation with multiple
>>>>                             VAPs using the same VNI--there is 1:1
>>>>                             mapping between VAP and VNI.
>>>>
>>>>                             Anoop
>>>>
>>>>                             On Tue, Oct 22, 2019 at 6:06 AM Joel M.
>>>>                             Halpern >>>                             > wrote:
>>>>
>>>>                                  From what I can tell, there are two
>>>>                                 separate problems.
>>>>                                 The document we have is a VTEP-VTEP
>>>>                                 monitoring document.  There is no
>>>>                                 need for that document to handle the
>>>>                                 multiple VNI case.
>>>>                                 If folks want a protocol for doing
>>>>                                 BFD monitoring of things behind the
>>>>                                 VTEPs (multiple VNIs), then do that
>>>>                                 as a separate document.   The
>>>>                                 encoding will be a tenant encoding,
>>>>                                 and thus sesparate from what is
>>>>                                 defined in this document.
>>>>
>>>>                                 Yours,
>>>>                                 Joel
>>>>
>>>>                                 On 10/21/2019 5:07 PM, Jeffrey Haas
>>>>                                 wrote:
>>>>                                 > Santosh and others,
>>>>                                 >
>>>>                                 > On Thu, Oct 03, 2019 at 07:50:20PM
>>>>                                 +0530, Santosh P K wrote:
>>>>                                 >>     Thanks for your explanation.
>>>>                                 This helps a lot. I would wait for more
>>>>                                 >> comments from others to see if
>>>>                                 this what we need in this draft to be
>>>>                                 >> supported based on that we can
>>>>                                 provide appropriate sections in the
>>>>                                 draft.
>>>>                                 >
>>>>                                 > The threads on the list have
>>>>                                 spidered to the point where it is
>>>>                                 challenging
>>>>                                 > to follow what the current status
>>>>                                 of the draft is, or should be.  :-)
>>>>                                 >
>>>>                                 > However, if I've followed things
>>>>                                 properly, the question below is
>>>>                                 really the
>>>>                                 > hinge point on what our
>>>>                                 encapsulation for BFD over vxlan
>>>>                                 should look like.
>>>>                                 > Correct?
>>>>                                 >
>>>>                                 > Essentially, do we or do we not
>>>>                                 require the ability to permit
>>>>                                 multiple BFD
>>>>                                 > sessions between distinct VAPs?
>>>>                                 >
>>>>                                 > If this is so, do we have a sense
>>>>                                 as to how we should proceed?
>>>>                                 >
>>>>                                 > -- Jeff
>>>>                                 >
>>>>                                 > [context preserved below...]
>>>>                                 >
>>>>                                 >> Santosh P K
>>>>                                 >>
>>>>                                 >> On Wed, Sep 25, 2019 at 8:10 AM
>>>>                                 >>>                                 > wrote:
>>>>                                 >>
>>>>                                 >>> Hi Santosh,
>>>>                                 >>>
>>>>                                 >>>
>>>>                                 >>> With regard to the question
>>>>                                 whether we should allow multiple BFD
>>>>                                 sessions
>>>>                                 >>> for the same VNI or not, IMHO we
>>>>                                 should allow it, more explanation as
>>>>                                 >>> follows.
>>>>                                 >>>
>>>>                                 >>> Below is a figure derived from
>>>>                                 figure 2 of RFC8014 (An Architecture for
>>>>                                 >>> Data-Center Network
>>>>                                 Virtualization over Layer 3 (NVO3)).
>>>>                                 >>>
>>>>                                 >>>                      |       
>>>>                                  Data Center Network (IP)        |
>>>>                                 >>>                      |         
>>>>                                                                |
>>>>                                 >>>                     
>>>>                                 +-----------------------------------------+
>>>>                                 >>>                           |     
>>>>                                                      |
>>>>                                 >>>                           |     
>>>>                                  Tunnel Overlay      |
>>>>                                 >>>             
>>>>                                 +------------+---------+     
>>>>                                  +---------+------------+
>>>>                                 >>>              |
>>>>                                 +----------+-------+ |       |
>>>>                                 +-------+----------+ |
>>>>                                 >>>              | |  Overlay
>>>>                                 Module  | |       | |  Overlay
>>>>                                 Module  | |
>>>>                                 >>>              |
>>>>                                 +---------+--------+ |       |
>>>>                                 +---------+--------+ |
>>>>                                 >>>              |           |     
>>>>                                     |       |           |          |
>>>>                                 >>>       NVE1   |           |     
>>>>                                     |       |           |          |
>>>>                                 NVE2
>>>>                                 >>>              | 
>>>>                                 +--------+-------+  |       | 
>>>>                                 +--------+-------+  |
>>>>                                 >>>              |  |VNI1 VNI2  VNI1
>>>>                                 |  |       |  | VNI1 VNI2 VNI1 |  |
>>>>                                 >>>              | 
>>>>                                 +-+-----+----+---+  |       | 
>>>>                                 +-+-----+-----+--+  |
>>>>                                 >>>              |VAP1| VAP2|    |
>>>>                                 VAP3 |       |VAP1| VAP2|     | VAP3|
>>>>                                 >>>             
>>>>                                 +----+-----+----+------+     
>>>>                                  +----+-----+-----+-----+
>>>>                                 >>>                   |     |    | 
>>>>                                                  |     |     |
>>>>                                 >>>                   |     |    | 
>>>>                                                  |     |     |
>>>>                                 >>>                   |     |    | 
>>>>                                                  |     |     |
>>>>                                 >>>           
>>>>                                 -------+-----+----+-------------------+-----+-----+-------
>>>>                                 >>>                   |     |    | 
>>>>                                    Tenant        |     |     |
>>>>                                 >>>              TSI1 | TSI2|    |
>>>>                                 TSI3          TSI1| TSI2|     |TSI3
>>>>                                 >>>                  +---+ +---+
>>>>                                 +---+             +---+ +---+   +---+
>>>>                                 >>>                  |TS1| |TS2|
>>>>                                 |TS3|             |TS4| |TS5|   |TS6|
>>>>                                 >>>                  +---+ +---+
>>>>                                 +---+             +---+ +---+   +---+
>>>>                                 >>>
>>>>                                 >>> To my understanding, the BFD
>>>>                                 sessions between NVE1 and NVE2 are
>>>>                                 actually
>>>>                                 >>> initiated and terminated at VAP
>>>>                                 of NVE.
>>>>                                 >>>
>>>>                                 >>> If the network operator want to
>>>>                                 set up one BFD session between VAP1 of
>>>>                                 >>> NVE1 and VAP1of NVE2, at the
>>>>                                 same time another BFD session
>>>>                                 between VAP3 of
>>>>                                 >>> NVE1 and VAP3 of NVE2, although
>>>>                                 the two BFD sessions are for the same
>>>>                                 >>> VNI1, I believe it's reasonable,
>>>>                                 so that's why I think we should allow it
>>>>
>>>>                                 _______________________________________________
>>>>                                 nvo3 mailing list
>>>>                                 nvo3@ietf.org 
>>>>                                 https://www.ietf.org/mailman/listinfo/nvo3
>>>>


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From: Anoop Ghanwani 
Date: Mon, 28 Oct 2019 10:32:16 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: "Joel M. Halpern" 
Cc: Santosh P K , Dinesh Dutt , Greg Mirsky , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Joel,

Perhaps we need to say use of an address owned by the device containing the
VTEP.

Or are you suggesting that the use of the loopback address space is a MUST?

Anoop

On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern 
wrote:

> There is something I am missing in your assumption about IRB.
>
> As I understand VxLAN, the VTEP is under the control of the operator.
> As such, it is a pure bridge.  If you run IRB behind it, that is fine.
> Yes, an operator may offer IRB.  But as I understand it,  conceptually,
> in terms of the VxLAN architecture the IRB is an entity behind the VTEP,
> not part of the VTEP.
>
> Yours,
> Joel
>
> On 10/28/2019 12:23 PM, Anoop Ghanwani wrote:
> > Santosh,
> >
> > Does it have to be a MUST?  What if I am running IRB and there are IP
> > addresses per VNI assigned to the VTEPs?  Why can the operator not
> > choose to use those?
> >
> > Anoop
> >
> > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K
> > >
> wrote:
> >
> >     Dinesh, Anoop et all,
> >           Lets us know if this text works for 127/8 address range?
> >
> >     [proposed text for firewall]
> >
> >     "As per section 4 inner destination IP address MUST be set to 127/8
> >     address. There may be firewall configured on VTEP to block 127/8
> >     address range if set as destination IP in inner IP header. It is
> >     recommended to allow 127/8 range address through firewall only if
> >     127/8 IP address is set as destination address in inner IP header."
> >
> >
> >     In section 4 we are talking about using 127/8 and not really giving
> >     reason why. I think we should have text as RFC 5884 has mentioned
> >     with below text.
> >
> >     [From RFC 5884]
> >     "The motivation for using the address range 127/8 is the same as
> >     specified in Section 2.1 of [RFC4379]
> >     . This is an
> >     exception to the behavior defined in [RFC1122
> >     ]."
> >
> >
> >
> >     Thanks
> >     Santosh P K
> >
> >
> >
> >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt  >     > wrote:
> >
> >         Looks good to me Greg. I see that the text around the use of the
> >         inner IP address as also quite acceptable. Will you add any
> >         words about the firewall?
> >
> >         Dinesh
> >
> >         On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky
> >         > wrote:
> >>         Hi Dinesh, et al.,
> >>         please check the updated version that removed the reference to
> >>         Hypervisor in the text and Figure 1.
> >>
> >>         Regards,
> >>         Greg
> >>
> >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K
> >>          >>         > wrote:
> >>
> >>             Dinesh,
> >>                  Please see my inline comments [SPK]
> >>
> >>
> >>                 - In section 3, there's a sentence that is: "BFD
> >>                 packets intended for a Hypervisor VTEP MUST NOT..". I
> >>                 recommend getting rid of the word "Hypervisor" ashe
> >>                 logic applies to any VTEP.
> >>
> >>             [SPK] Thanks for comments. We will change this.
> >>
> >>                 - You already explained the precedence of the use of
> >>                 127/8 address in the inner header in MPLS. I have no
> >>                 specific comments in that area. I have only two
> >>                 questions:
> >>                    - Has anybody verified that the use of 127/8
> >>                 address (and the right MAC) works with existing
> >>                 implementations, including the silicon ones? If this
> >>                 doesn't work there, is it worth adding the possibilit
> >>                 y of another address, one that is owned by the VTEP
> node?
> >>
> >>                    - Do we know if Firewalls stop such VXLAN packets?
> >>                 I ask this because VXLAN has an IP header and I don't
> >>                 know if firewalls stop packets with 127/8 in the inner
> >>                 header. If not, is it worth adding a sentence to say
> >>                 that firewalls  allow such packets? The use of a
> >>                 non-127/8 address may alleviate this case as well.
> >>
> >>             [SPK] I think we may need to add the text about firewall
> >>             as some checks in firewall will be there if they are not
> >>             already using MPLS OAM which has inner IP header with
> >>             127/8 address range.
> >>
> >>
> >>                 The rest of the draft looks good to me,
> >>
> >>                 Dinesh
> >>
> >>                 On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky
> >>                 >
> >>                 wrote:
> >>>                 Hi Dinesh,
> >>>                 I greatly appreciate your comments. Please heave a
> >>>                 look at the attached copy of the working version and
> >>>                 its diff to -07 (latest in the datatracker).
> >>>
> >>>                 Regards,
> >>>                 Greg
> >>>
> >>>                 On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt
> >>>                 > wrote:
> >>>
> >>>                     I have the same feeling as Anoop. Greg, can you
> >>>                     please point me to the latest draft so that I can
> >>>                     quickly glance through it to be doubly sure,
> >>>
> >>>                     Dinesh
> >>>
> >>>                     On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani
> >>>                      >>>                     > wrote:
> >>>>                     Greg,
> >>>>
> >>>>                     I think the draft is fine as is.
> >>>>
> >>>>                     I discussion with Xiao Min was about #3 and I
> >>>>                     see that as unnecessary until we have a draft
> >>>>                     that explains why that is needed in the context
> >>>>                     of the NVO3 architecture.
> >>>>
> >>>>                     Anoop
> >>>>
> >>>>                     On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky
> >>>>                      >>>>                     > wrote:
> >>>>
> >>>>                         Hi Anoop, et al.,
> >>>>                         I agree with your understanding of what is
> >>>>                         being defined in the current version of the
> >>>>                         BFD over VxLAN specification. But, as I
> >>>>                         understand, the WG is discussing the scope
> >>>>                         before the WGLC is closed. I believe there
> >>>>                         are three options:
> >>>>
> >>>>                          1. single BFD session between two VTEPs
> >>>>                          2. single BFD session per VNI between two
> VTEPs
> >>>>                          3. multiple BFD sessions per VNI between
> >>>>                             two VTEPs
> >>>>
> >>>>                         The current text reflects #2. Is WG accepts
> >>>>                         this scope? If not, which option WG would
> >>>>                         accept?
> >>>>
> >>>>                         Regards,
> >>>>                         Greg
> >>>>
> >>>>                         On Tue, Oct 22, 2019 at 2:09 PM Anoop
> >>>>                         Ghanwani  >>>>                         > wrote:
> >>>>
> >>>>                             I concur with Joel's assessment with the
> >>>>                             following clarifications.
> >>>>
> >>>>                             The current document is already capable
> >>>>                             of monitoring multiple VNIs between VTEPs.
> >>>>
> >>>>                             The issue under discussion was how do we
> >>>>                             use BFD to monitor multiple VAPs that
> >>>>                             use the same VNI between a pair of
> >>>>                             VTEPs.  The use case for this is not
> >>>>                             clear to me, as from my understanding,
> >>>>                             we cannot have a situation with multiple
> >>>>                             VAPs using the same VNI--there is 1:1
> >>>>                             mapping between VAP and VNI.
> >>>>
> >>>>                             Anoop
> >>>>
> >>>>                             On Tue, Oct 22, 2019 at 6:06 AM Joel M.
> >>>>                             Halpern  >>>>                             > wrote:
> >>>>
> >>>>                                  From what I can tell, there are two
> >>>>                                 separate problems.
> >>>>                                 The document we have is a VTEP-VTEP
> >>>>                                 monitoring document.  There is no
> >>>>                                 need for that document to handle the
> >>>>                                 multiple VNI case.
> >>>>                                 If folks want a protocol for doing
> >>>>                                 BFD monitoring of things behind the
> >>>>                                 VTEPs (multiple VNIs), then do that
> >>>>                                 as a separate document.   The
> >>>>                                 encoding will be a tenant encoding,
> >>>>                                 and thus sesparate from what is
> >>>>                                 defined in this document.
> >>>>
> >>>>                                 Yours,
> >>>>                                 Joel
> >>>>
> >>>>                                 On 10/21/2019 5:07 PM, Jeffrey Haas
> >>>>                                 wrote:
> >>>>                                 > Santosh and others,
> >>>>                                 >
> >>>>                                 > On Thu, Oct 03, 2019 at 07:50:20PM
> >>>>                                 +0530, Santosh P K wrote:
> >>>>                                 >>     Thanks for your explanation.
> >>>>                                 This helps a lot. I would wait for
> more
> >>>>                                 >> comments from others to see if
> >>>>                                 this what we need in this draft to be
> >>>>                                 >> supported based on that we can
> >>>>                                 provide appropriate sections in the
> >>>>                                 draft.
> >>>>                                 >
> >>>>                                 > The threads on the list have
> >>>>                                 spidered to the point where it is
> >>>>                                 challenging
> >>>>                                 > to follow what the current status
> >>>>                                 of the draft is, or should be.  :-)
> >>>>                                 >
> >>>>                                 > However, if I've followed things
> >>>>                                 properly, the question below is
> >>>>                                 really the
> >>>>                                 > hinge point on what our
> >>>>                                 encapsulation for BFD over vxlan
> >>>>                                 should look like.
> >>>>                                 > Correct?
> >>>>                                 >
> >>>>                                 > Essentially, do we or do we not
> >>>>                                 require the ability to permit
> >>>>                                 multiple BFD
> >>>>                                 > sessions between distinct VAPs?
> >>>>                                 >
> >>>>                                 > If this is so, do we have a sense
> >>>>                                 as to how we should proceed?
> >>>>                                 >
> >>>>                                 > -- Jeff
> >>>>                                 >
> >>>>                                 > [context preserved below...]
> >>>>                                 >
> >>>>                                 >> Santosh P K
> >>>>                                 >>
> >>>>                                 >> On Wed, Sep 25, 2019 at 8:10 AM
> >>>>                                  >>>>                                 > wrote:
> >>>>                                 >>
> >>>>                                 >>> Hi Santosh,
> >>>>                                 >>>
> >>>>                                 >>>
> >>>>                                 >>> With regard to the question
> >>>>                                 whether we should allow multiple BFD
> >>>>                                 sessions
> >>>>                                 >>> for the same VNI or not, IMHO we
> >>>>                                 should allow it, more explanation as
> >>>>                                 >>> follows.
> >>>>                                 >>>
> >>>>                                 >>> Below is a figure derived from
> >>>>                                 figure 2 of RFC8014 (An Architecture
> for
> >>>>                                 >>> Data-Center Network
> >>>>                                 Virtualization over Layer 3 (NVO3)).
> >>>>                                 >>>
> >>>>                                 >>>                      |
> >>>>                                  Data Center Network (IP)        |
> >>>>                                 >>>                      |
> >>>>                                                                |
> >>>>                                 >>>
> >>>>
>  +-----------------------------------------+
> >>>>                                 >>>                           |
> >>>>                                                      |
> >>>>                                 >>>                           |
> >>>>                                  Tunnel Overlay      |
> >>>>                                 >>>
> >>>>                                 +------------+---------+
> >>>>                                  +---------+------------+
> >>>>                                 >>>              |
> >>>>                                 +----------+-------+ |       |
> >>>>                                 +-------+----------+ |
> >>>>                                 >>>              | |  Overlay
> >>>>                                 Module  | |       | |  Overlay
> >>>>                                 Module  | |
> >>>>                                 >>>              |
> >>>>                                 +---------+--------+ |       |
> >>>>                                 +---------+--------+ |
> >>>>                                 >>>              |           |
> >>>>                                     |       |           |          |
> >>>>                                 >>>       NVE1   |           |
> >>>>                                     |       |           |          |
> >>>>                                 NVE2
> >>>>                                 >>>              |
> >>>>                                 +--------+-------+  |       |
> >>>>                                 +--------+-------+  |
> >>>>                                 >>>              |  |VNI1 VNI2  VNI1
> >>>>                                 |  |       |  | VNI1 VNI2 VNI1 |  |
> >>>>                                 >>>              |
> >>>>                                 +-+-----+----+---+  |       |
> >>>>                                 +-+-----+-----+--+  |
> >>>>                                 >>>              |VAP1| VAP2|    |
> >>>>                                 VAP3 |       |VAP1| VAP2|     | VAP3|
> >>>>                                 >>>
> >>>>                                 +----+-----+----+------+
> >>>>                                  +----+-----+-----+-----+
> >>>>                                 >>>                   |     |    |
> >>>>                                                  |     |     |
> >>>>                                 >>>                   |     |    |
> >>>>                                                  |     |     |
> >>>>                                 >>>                   |     |    |
> >>>>                                                  |     |     |
> >>>>                                 >>>
> >>>>
>  -------+-----+----+-------------------+-----+-----+-------
> >>>>                                 >>>                   |     |    |
> >>>>                                    Tenant        |     |     |
> >>>>                                 >>>              TSI1 | TSI2|    |
> >>>>                                 TSI3          TSI1| TSI2|     |TSI3
> >>>>                                 >>>                  +---+ +---+
> >>>>                                 +---+             +---+ +---+   +---+
> >>>>                                 >>>                  |TS1| |TS2|
> >>>>                                 |TS3|             |TS4| |TS5|   |TS6|
> >>>>                                 >>>                  +---+ +---+
> >>>>                                 +---+             +---+ +---+   +---+
> >>>>                                 >>>
> >>>>                                 >>> To my understanding, the BFD
> >>>>                                 sessions between NVE1 and NVE2 are
> >>>>                                 actually
> >>>>                                 >>> initiated and terminated at VAP
> >>>>                                 of NVE.
> >>>>                                 >>>
> >>>>                                 >>> If the network operator want to
> >>>>                                 set up one BFD session between VAP1 of
> >>>>                                 >>> NVE1 and VAP1of NVE2, at the
> >>>>                                 same time another BFD session
> >>>>                                 between VAP3 of
> >>>>                                 >>> NVE1 and VAP3 of NVE2, although
> >>>>                                 the two BFD sessions are for the same
> >>>>                                 >>> VNI1, I believe it's reasonable,
> >>>>                                 so that's why I think we should allow
> it
> >>>>
> >>>>
>  _______________________________________________
> >>>>                                 nvo3 mailing list
> >>>>                                 nvo3@ietf.org 
> >>>>
> https://www.ietf.org/mailman/listinfo/nvo3
> >>>>
>

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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani 
Cc: Santosh P K , Dinesh Dutt , Greg Mirsky , Jeffrey Haas , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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From: "Joel M. Halpern" 
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Date: Mon, 28 Oct 2019 13:46:15 -0400
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I can live with saying that you SHOULD use loopback, and MAY instead use 
an IP address in the customer space known to be owned by the VTEP device 
when such exists.

Yours,
Joel

On 10/28/2019 1:32 PM, Anoop Ghanwani wrote:
> Hi Joel,
> 
> Perhaps we need to say use of an address owned by the device containing 
> the VTEP.
> 
> Or are you suggesting that the use of the loopback address space is a MUST?
> 
> Anoop
> 
> On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern  > wrote:
> 
>     There is something I am missing in your assumption about IRB.
> 
>     As I understand VxLAN, the VTEP is under the control of the operator.
>     As such, it is a pure bridge.  If you run IRB behind it, that is fine.
>     Yes, an operator may offer IRB.  But as I understand it,  conceptually,
>     in terms of the VxLAN architecture the IRB is an entity behind the
>     VTEP,
>     not part of the VTEP.
> 
>     Yours,
>     Joel
> 
>     On 10/28/2019 12:23 PM, Anoop Ghanwani wrote:
>      > Santosh,
>      >
>      > Does it have to be a MUST?  What if I am running IRB and there
>     are IP
>      > addresses per VNI assigned to the VTEPs?  Why can the operator not
>      > choose to use those?
>      >
>      > Anoop
>      >
>      > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K
>      >      
>          >> wrote:
>      >
>      >     Dinesh, Anoop et all,
>      >           Lets us know if this text works for 127/8 address range?
>      >
>      >     [proposed text for firewall]
>      >
>      >     "As per section 4 inner destination IP address MUST be set to
>     127/8
>      >     address. There may be firewall configured on VTEP to block 127/8
>      >     address range if set as destination IP in inner IP header. It is
>      >     recommended to allow 127/8 range address through firewall only if
>      >     127/8 IP address is set as destination address in inner IP
>     header."
>      >
>      >
>      >     In section 4 we are talking about using 127/8 and not really
>     giving
>      >     reason why. I think we should have text as RFC 5884 has mentioned
>      >     with below text.
>      >
>      >     [From RFC 5884]
>      >     "The motivation for using the address range 127/8 is the same as
>      >     specified in Section 2.1 of [RFC4379]
>      >     . This is an
>      >     exception to the behavior defined in [RFC1122
>      >     ]."
>      >
>      >
>      >
>      >     Thanks
>      >     Santosh P K
>      >
>      >
>      >
>      >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt      
>      >     >> wrote:
>      >
>      >         Looks good to me Greg. I see that the text around the use
>     of the
>      >         inner IP address as also quite acceptable. Will you add any
>      >         words about the firewall?
>      >
>      >         Dinesh
>      >
>      >         On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky
>      >         
>     >> wrote:
>      >>         Hi Dinesh, et al.,
>      >>         please check the updated version that removed the
>     reference to
>      >>         Hypervisor in the text and Figure 1.
>      >>
>      >>         Regards,
>      >>         Greg
>      >>
>      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K
>      >>              
>      >>              >> wrote:
>      >>
>      >>             Dinesh,
>      >>                  Please see my inline comments [SPK]
>      >>
>      >>
>      >>                 - In section 3, there's a sentence that is: "BFD
>      >>                 packets intended for a Hypervisor VTEP MUST
>     NOT..". I
>      >>                 recommend getting rid of the word "Hypervisor" ashe
>      >>                 logic applies to any VTEP.
>      >>
>      >>             [SPK] Thanks for comments. We will change this.
>      >>
>      >>                 - You already explained the precedence of the use of
>      >>                 127/8 address in the inner header in MPLS. I have no
>      >>                 specific comments in that area. I have only two
>      >>                 questions:
>      >>                    - Has anybody verified that the use of 127/8
>      >>                 address (and the right MAC) works with existing
>      >>                 implementations, including the silicon ones? If this
>      >>                 doesn't work there, is it worth adding the
>     possibilit
>      >>                 y of another address, one that is owned by the
>     VTEP node?
>      >>
>      >>                    - Do we know if Firewalls stop such VXLAN
>     packets?
>      >>                 I ask this because VXLAN has an IP header and I
>     don't
>      >>                 know if firewalls stop packets with 127/8 in the
>     inner
>      >>                 header. If not, is it worth adding a sentence to say
>      >>                 that firewalls  allow such packets? The use of a
>      >>                 non-127/8 address may alleviate this case as well.
>      >>
>      >>             [SPK] I think we may need to add the text about firewall
>      >>             as some checks in firewall will be there if they are not
>      >>             already using MPLS OAM which has inner IP header with
>      >>             127/8 address range.
>      >>
>      >>
>      >>                 The rest of the draft looks good to me,
>      >>
>      >>                 Dinesh
>      >>
>      >>                 On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky
>      >>                            >>
>      >>                 wrote:
>      >>>                 Hi Dinesh,
>      >>>                 I greatly appreciate your comments. Please heave a
>      >>>                 look at the attached copy of the working
>     version and
>      >>>                 its diff to -07 (latest in the datatracker).
>      >>>
>      >>>                 Regards,
>      >>>                 Greg
>      >>>
>      >>>                 On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt
>      >>>                 
>     >> wrote:
>      >>>
>      >>>                     I have the same feeling as Anoop. Greg, can you
>      >>>                     please point me to the latest draft so that
>     I can
>      >>>                     quickly glance through it to be doubly sure,
>      >>>
>      >>>                     Dinesh
>      >>>
>      >>>                     On Wed, Oct 23, 2019 at 4:35 AM, Anoop Ghanwani
>      >>>                          
>      >>>                          >> wrote:
>      >>>>                     Greg,
>      >>>>
>      >>>>                     I think the draft is fine as is.
>      >>>>
>      >>>>                     I discussion with Xiao Min was about #3 and I
>      >>>>                     see that as unnecessary until we have a draft
>      >>>>                     that explains why that is needed in the
>     context
>      >>>>                     of the NVO3 architecture.
>      >>>>
>      >>>>                     Anoop
>      >>>>
>      >>>>                     On Tue, Oct 22, 2019 at 11:17 AM Greg Mirsky
>      >>>>                          
>      >>>>                          >> wrote:
>      >>>>
>      >>>>                         Hi Anoop, et al.,
>      >>>>                         I agree with your understanding of what is
>      >>>>                         being defined in the current version
>     of the
>      >>>>                         BFD over VxLAN specification. But, as I
>      >>>>                         understand, the WG is discussing the scope
>      >>>>                         before the WGLC is closed. I believe there
>      >>>>                         are three options:
>      >>>>
>      >>>>                          1. single BFD session between two VTEPs
>      >>>>                          2. single BFD session per VNI between
>     two VTEPs
>      >>>>                          3. multiple BFD sessions per VNI between
>      >>>>                             two VTEPs
>      >>>>
>      >>>>                         The current text reflects #2. Is WG
>     accepts
>      >>>>                         this scope? If not, which option WG would
>      >>>>                         accept?
>      >>>>
>      >>>>                         Regards,
>      >>>>                         Greg
>      >>>>
>      >>>>                         On Tue, Oct 22, 2019 at 2:09 PM Anoop
>      >>>>                         Ghanwani      
>      >>>>                              >> wrote:
>      >>>>
>      >>>>                             I concur with Joel's assessment
>     with the
>      >>>>                             following clarifications.
>      >>>>
>      >>>>                             The current document is already
>     capable
>      >>>>                             of monitoring multiple VNIs
>     between VTEPs.
>      >>>>
>      >>>>                             The issue under discussion was how
>     do we
>      >>>>                             use BFD to monitor multiple VAPs that
>      >>>>                             use the same VNI between a pair of
>      >>>>                             VTEPs.  The use case for this is not
>      >>>>                             clear to me, as from my understanding,
>      >>>>                             we cannot have a situation with
>     multiple
>      >>>>                             VAPs using the same VNI--there is 1:1
>      >>>>                             mapping between VAP and VNI.
>      >>>>
>      >>>>                             Anoop
>      >>>>
>      >>>>                             On Tue, Oct 22, 2019 at 6:06 AM
>     Joel M.
>      >>>>                             Halpern      
>      >>>>                                  >> wrote:
>      >>>>
>      >>>>                                  From what I can tell, there
>     are two
>      >>>>                                 separate problems.
>      >>>>                                 The document we have is a
>     VTEP-VTEP
>      >>>>                                 monitoring document.  There is no
>      >>>>                                 need for that document to
>     handle the
>      >>>>                                 multiple VNI case.
>      >>>>                                 If folks want a protocol for doing
>      >>>>                                 BFD monitoring of things
>     behind the
>      >>>>                                 VTEPs (multiple VNIs), then do
>     that
>      >>>>                                 as a separate document.   The
>      >>>>                                 encoding will be a tenant
>     encoding,
>      >>>>                                 and thus sesparate from what is
>      >>>>                                 defined in this document.
>      >>>>
>      >>>>                                 Yours,
>      >>>>                                 Joel
>      >>>>
>      >>>>                                 On 10/21/2019 5:07 PM, Jeffrey
>     Haas
>      >>>>                                 wrote:
>      >>>>                                 > Santosh and others,
>      >>>>                                 >
>      >>>>                                 > On Thu, Oct 03, 2019 at
>     07:50:20PM
>      >>>>                                 +0530, Santosh P K wrote:
>      >>>>                                 >>     Thanks for your
>     explanation.
>      >>>>                                 This helps a lot. I would wait
>     for more
>      >>>>                                 >> comments from others to see if
>      >>>>                                 this what we need in this
>     draft to be
>      >>>>                                 >> supported based on that we can
>      >>>>                                 provide appropriate sections
>     in the
>      >>>>                                 draft.
>      >>>>                                 >
>      >>>>                                 > The threads on the list have
>      >>>>                                 spidered to the point where it is
>      >>>>                                 challenging
>      >>>>                                 > to follow what the current
>     status
>      >>>>                                 of the draft is, or should
>     be.  :-)
>      >>>>                                 >
>      >>>>                                 > However, if I've followed things
>      >>>>                                 properly, the question below is
>      >>>>                                 really the
>      >>>>                                 > hinge point on what our
>      >>>>                                 encapsulation for BFD over vxlan
>      >>>>                                 should look like.
>      >>>>                                 > Correct?
>      >>>>                                 >
>      >>>>                                 > Essentially, do we or do we not
>      >>>>                                 require the ability to permit
>      >>>>                                 multiple BFD
>      >>>>                                 > sessions between distinct VAPs?
>      >>>>                                 >
>      >>>>                                 > If this is so, do we have a
>     sense
>      >>>>                                 as to how we should proceed?
>      >>>>                                 >
>      >>>>                                 > -- Jeff
>      >>>>                                 >
>      >>>>                                 > [context preserved below...]
>      >>>>                                 >
>      >>>>                                 >> Santosh P K
>      >>>>                                 >>
>      >>>>                                 >> On Wed, Sep 25, 2019 at 8:10 AM
>      >>>>                                      
>      >>>>                                      >> wrote:
>      >>>>                                 >>
>      >>>>                                 >>> Hi Santosh,
>      >>>>                                 >>>
>      >>>>                                 >>>
>      >>>>                                 >>> With regard to the question
>      >>>>                                 whether we should allow
>     multiple BFD
>      >>>>                                 sessions
>      >>>>                                 >>> for the same VNI or not,
>     IMHO we
>      >>>>                                 should allow it, more
>     explanation as
>      >>>>                                 >>> follows.
>      >>>>                                 >>>
>      >>>>                                 >>> Below is a figure derived from
>      >>>>                                 figure 2 of RFC8014 (An
>     Architecture for
>      >>>>                                 >>> Data-Center Network
>      >>>>                                 Virtualization over Layer 3
>     (NVO3)).
>      >>>>                                 >>>
>      >>>>                                 >>>                      |
>      >>>>                                  Data Center Network (IP)        |
>      >>>>                                 >>>                      |
>      >>>>                                                                |
>      >>>>                                 >>>
>      >>>>                               
>       +-----------------------------------------+
>      >>>>                                 >>>                           |
>      >>>>                                                      |
>      >>>>                                 >>>                           |
>      >>>>                                  Tunnel Overlay      |
>      >>>>                                 >>>
>      >>>>                                 +------------+---------+
>      >>>>                                  +---------+------------+
>      >>>>                                 >>>              |
>      >>>>                                 +----------+-------+ |       |
>      >>>>                                 +-------+----------+ |
>      >>>>                                 >>>              | |  Overlay
>      >>>>                                 Module  | |       | |  Overlay
>      >>>>                                 Module  | |
>      >>>>                                 >>>              |
>      >>>>                                 +---------+--------+ |       |
>      >>>>                                 +---------+--------+ |
>      >>>>                                 >>>              |           |
>      >>>>                                     |       |           |     
>          |
>      >>>>                                 >>>       NVE1   |           |
>      >>>>                                     |       |           |     
>          |
>      >>>>                                 NVE2
>      >>>>                                 >>>              |
>      >>>>                                 +--------+-------+  |       |
>      >>>>                                 +--------+-------+  |
>      >>>>                                 >>>              |  |VNI1
>     VNI2  VNI1
>      >>>>                                 |  |       |  | VNI1 VNI2 VNI1
>     |  |
>      >>>>                                 >>>              |
>      >>>>                                 +-+-----+----+---+  |       |
>      >>>>                                 +-+-----+-----+--+  |
>      >>>>                                 >>>              |VAP1| VAP2|    |
>      >>>>                                 VAP3 |       |VAP1| VAP2|   
>       | VAP3|
>      >>>>                                 >>>
>      >>>>                                 +----+-----+----+------+
>      >>>>                                  +----+-----+-----+-----+
>      >>>>                                 >>>                   |     | 
>        |
>      >>>>                                                  |     |     |
>      >>>>                                 >>>                   |     | 
>        |
>      >>>>                                                  |     |     |
>      >>>>                                 >>>                   |     | 
>        |
>      >>>>                                                  |     |     |
>      >>>>                                 >>>
>      >>>>                               
>       -------+-----+----+-------------------+-----+-----+-------
>      >>>>                                 >>>                   |     | 
>        |
>      >>>>                                    Tenant        |     |     |
>      >>>>                                 >>>              TSI1 | TSI2|    |
>      >>>>                                 TSI3          TSI1| TSI2|   
>       |TSI3
>      >>>>                                 >>>                  +---+ +---+
>      >>>>                                 +---+             +---+ +---+ 
>       +---+
>      >>>>                                 >>>                  |TS1| |TS2|
>      >>>>                                 |TS3|             |TS4| |TS5| 
>       |TS6|
>      >>>>                                 >>>                  +---+ +---+
>      >>>>                                 +---+             +---+ +---+ 
>       +---+
>      >>>>                                 >>>
>      >>>>                                 >>> To my understanding, the BFD
>      >>>>                                 sessions between NVE1 and NVE2 are
>      >>>>                                 actually
>      >>>>                                 >>> initiated and terminated
>     at VAP
>      >>>>                                 of NVE.
>      >>>>                                 >>>
>      >>>>                                 >>> If the network operator
>     want to
>      >>>>                                 set up one BFD session between
>     VAP1 of
>      >>>>                                 >>> NVE1 and VAP1of NVE2, at the
>      >>>>                                 same time another BFD session
>      >>>>                                 between VAP3 of
>      >>>>                                 >>> NVE1 and VAP3 of NVE2,
>     although
>      >>>>                                 the two BFD sessions are for
>     the same
>      >>>>                                 >>> VNI1, I believe it's
>     reasonable,
>      >>>>                                 so that's why I think we
>     should allow it
>      >>>>
>      >>>>                               
>       _______________________________________________
>      >>>>                                 nvo3 mailing list
>      >>>> nvo3@ietf.org       >
>      >>>> https://www.ietf.org/mailman/listinfo/nvo3
>      >>>>
> 


From nobody Mon Oct 28 11:39:01 2019
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In-Reply-To: 
From: Anoop Ghanwani 
Date: Mon, 28 Oct 2019 10:58:21 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: "Joel M. Halpern" 
Cc: Santosh P K , Dinesh Dutt , Greg Mirsky , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Joel,

Are we going to qualify this by VNI?  There's a bunch of implementations
out there that don't use a tenant IP or a loopback with VNI 0--they simply
repeat the underlay IP in the inner IPDA.

Thanks,
Anoop

On Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern 
wrote:

> I can live with saying that you SHOULD use loopback, and MAY instead use
> an IP address in the customer space known to be owned by the VTEP device
> when such exists.
>
> Yours,
> Joel
>
> On 10/28/2019 1:32 PM, Anoop Ghanwani wrote:
> > Hi Joel,
> >
> > Perhaps we need to say use of an address owned by the device containing
> > the VTEP.
> >
> > Or are you suggesting that the use of the loopback address space is a
> MUST?
> >
> > Anoop
> >
> > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern  > > wrote:
> >
> >     There is something I am missing in your assumption about IRB.
> >
> >     As I understand VxLAN, the VTEP is under the control of the operator.
> >     As such, it is a pure bridge.  If you run IRB behind it, that is
> fine.
> >     Yes, an operator may offer IRB.  But as I understand it,
> conceptually,
> >     in terms of the VxLAN architecture the IRB is an entity behind the
> >     VTEP,
> >     not part of the VTEP.
> >
> >     Yours,
> >     Joel
> >
> >     On 10/28/2019 12:23 PM, Anoop Ghanwani wrote:
> >      > Santosh,
> >      >
> >      > Does it have to be a MUST?  What if I am running IRB and there
> >     are IP
> >      > addresses per VNI assigned to the VTEPs?  Why can the operator not
> >      > choose to use those?
> >      >
> >      > Anoop
> >      >
> >      > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K
> >      >  >     
> >      >     >> wrote:
> >      >
> >      >     Dinesh, Anoop et all,
> >      >           Lets us know if this text works for 127/8 address range?
> >      >
> >      >     [proposed text for firewall]
> >      >
> >      >     "As per section 4 inner destination IP address MUST be set to
> >     127/8
> >      >     address. There may be firewall configured on VTEP to block
> 127/8
> >      >     address range if set as destination IP in inner IP header. It
> is
> >      >     recommended to allow 127/8 range address through firewall
> only if
> >      >     127/8 IP address is set as destination address in inner IP
> >     header."
> >      >
> >      >
> >      >     In section 4 we are talking about using 127/8 and not really
> >     giving
> >      >     reason why. I think we should have text as RFC 5884 has
> mentioned
> >      >     with below text.
> >      >
> >      >     [From RFC 5884]
> >      >     "The motivation for using the address range 127/8 is the same
> as
> >      >     specified in Section 2.1 of [RFC4379]
> >      >     . This is an
> >      >     exception to the behavior defined in [RFC1122
> >      >     ]."
> >      >
> >      >
> >      >
> >      >     Thanks
> >      >     Santosh P K
> >      >
> >      >
> >      >
> >      >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt  >     
> >      >     >> wrote:
> >      >
> >      >         Looks good to me Greg. I see that the text around the use
> >     of the
> >      >         inner IP address as also quite acceptable. Will you add
> any
> >      >         words about the firewall?
> >      >
> >      >         Dinesh
> >      >
> >      >         On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky
> >      >         
> >     >>
> wrote:
> >      >>         Hi Dinesh, et al.,
> >      >>         please check the updated version that removed the
> >     reference to
> >      >>         Hypervisor in the text and Figure 1.
> >      >>
> >      >>         Regards,
> >      >>         Greg
> >      >>
> >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K
> >      >>          >     
> >      >>          >     >> wrote:
> >      >>
> >      >>             Dinesh,
> >      >>                  Please see my inline comments [SPK]
> >      >>
> >      >>
> >      >>                 - In section 3, there's a sentence that is: "BFD
> >      >>                 packets intended for a Hypervisor VTEP MUST
> >     NOT..". I
> >      >>                 recommend getting rid of the word "Hypervisor"
> ashe
> >      >>                 logic applies to any VTEP.
> >      >>
> >      >>             [SPK] Thanks for comments. We will change this.
> >      >>
> >      >>                 - You already explained the precedence of the
> use of
> >      >>                 127/8 address in the inner header in MPLS. I
> have no
> >      >>                 specific comments in that area. I have only two
> >      >>                 questions:
> >      >>                    - Has anybody verified that the use of 127/8
> >      >>                 address (and the right MAC) works with existing
> >      >>                 implementations, including the silicon ones? If
> this
> >      >>                 doesn't work there, is it worth adding the
> >     possibilit
> >      >>                 y of another address, one that is owned by the
> >     VTEP node?
> >      >>
> >      >>                    - Do we know if Firewalls stop such VXLAN
> >     packets?
> >      >>                 I ask this because VXLAN has an IP header and I
> >     don't
> >      >>                 know if firewalls stop packets with 127/8 in the
> >     inner
> >      >>                 header. If not, is it worth adding a sentence to
> say
> >      >>                 that firewalls  allow such packets? The use of a
> >      >>                 non-127/8 address may alleviate this case as
> well.
> >      >>
> >      >>             [SPK] I think we may need to add the text about
> firewall
> >      >>             as some checks in firewall will be there if they are
> not
> >      >>             already using MPLS OAM which has inner IP header with
> >      >>             127/8 address range.
> >      >>
> >      >>
> >      >>                 The rest of the draft looks good to me,
> >      >>
> >      >>                 Dinesh
> >      >>
> >      >>                 On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky
> >      >>                  >       >     >>
> >      >>                 wrote:
> >      >>>                 Hi Dinesh,
> >      >>>                 I greatly appreciate your comments. Please
> heave a
> >      >>>                 look at the attached copy of the working
> >     version and
> >      >>>                 its diff to -07 (latest in the datatracker).
> >      >>>
> >      >>>                 Regards,
> >      >>>                 Greg
> >      >>>
> >      >>>                 On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt
> >      >>>                 
> >     >> wrote:
> >      >>>
> >      >>>                     I have the same feeling as Anoop. Greg, can
> you
> >      >>>                     please point me to the latest draft so that
> >     I can
> >      >>>                     quickly glance through it to be doubly sure,
> >      >>>
> >      >>>                     Dinesh
> >      >>>
> >      >>>                     On Wed, Oct 23, 2019 at 4:35 AM, Anoop
> Ghanwani
> >      >>>                      >     
> >      >>>                      >     >> wrote:
> >      >>>>                     Greg,
> >      >>>>
> >      >>>>                     I think the draft is fine as is.
> >      >>>>
> >      >>>>                     I discussion with Xiao Min was about #3
> and I
> >      >>>>                     see that as unnecessary until we have a
> draft
> >      >>>>                     that explains why that is needed in the
> >     context
> >      >>>>                     of the NVO3 architecture.
> >      >>>>
> >      >>>>                     Anoop
> >      >>>>
> >      >>>>                     On Tue, Oct 22, 2019 at 11:17 AM Greg
> Mirsky
> >      >>>>                      >     
> >      >>>>                      >     >> wrote:
> >      >>>>
> >      >>>>                         Hi Anoop, et al.,
> >      >>>>                         I agree with your understanding of
> what is
> >      >>>>                         being defined in the current version
> >     of the
> >      >>>>                         BFD over VxLAN specification. But, as I
> >      >>>>                         understand, the WG is discussing the
> scope
> >      >>>>                         before the WGLC is closed. I believe
> there
> >      >>>>                         are three options:
> >      >>>>
> >      >>>>                          1. single BFD session between two
> VTEPs
> >      >>>>                          2. single BFD session per VNI between
> >     two VTEPs
> >      >>>>                          3. multiple BFD sessions per VNI
> between
> >      >>>>                             two VTEPs
> >      >>>>
> >      >>>>                         The current text reflects #2. Is WG
> >     accepts
> >      >>>>                         this scope? If not, which option WG
> would
> >      >>>>                         accept?
> >      >>>>
> >      >>>>                         Regards,
> >      >>>>                         Greg
> >      >>>>
> >      >>>>                         On Tue, Oct 22, 2019 at 2:09 PM Anoop
> >      >>>>                         Ghanwani  >     
> >      >>>>                          >     >> wrote:
> >      >>>>
> >      >>>>                             I concur with Joel's assessment
> >     with the
> >      >>>>                             following clarifications.
> >      >>>>
> >      >>>>                             The current document is already
> >     capable
> >      >>>>                             of monitoring multiple VNIs
> >     between VTEPs.
> >      >>>>
> >      >>>>                             The issue under discussion was how
> >     do we
> >      >>>>                             use BFD to monitor multiple VAPs
> that
> >      >>>>                             use the same VNI between a pair of
> >      >>>>                             VTEPs.  The use case for this is
> not
> >      >>>>                             clear to me, as from my
> understanding,
> >      >>>>                             we cannot have a situation with
> >     multiple
> >      >>>>                             VAPs using the same VNI--there is
> 1:1
> >      >>>>                             mapping between VAP and VNI.
> >      >>>>
> >      >>>>                             Anoop
> >      >>>>
> >      >>>>                             On Tue, Oct 22, 2019 at 6:06 AM
> >     Joel M.
> >      >>>>                             Halpern  >     
> >      >>>>                              >     >> wrote:
> >      >>>>
> >      >>>>                                  From what I can tell, there
> >     are two
> >      >>>>                                 separate problems.
> >      >>>>                                 The document we have is a
> >     VTEP-VTEP
> >      >>>>                                 monitoring document.  There is
> no
> >      >>>>                                 need for that document to
> >     handle the
> >      >>>>                                 multiple VNI case.
> >      >>>>                                 If folks want a protocol for
> doing
> >      >>>>                                 BFD monitoring of things
> >     behind the
> >      >>>>                                 VTEPs (multiple VNIs), then do
> >     that
> >      >>>>                                 as a separate document.   The
> >      >>>>                                 encoding will be a tenant
> >     encoding,
> >      >>>>                                 and thus sesparate from what is
> >      >>>>                                 defined in this document.
> >      >>>>
> >      >>>>                                 Yours,
> >      >>>>                                 Joel
> >      >>>>
> >      >>>>                                 On 10/21/2019 5:07 PM, Jeffrey
> >     Haas
> >      >>>>                                 wrote:
> >      >>>>                                 > Santosh and others,
> >      >>>>                                 >
> >      >>>>                                 > On Thu, Oct 03, 2019 at
> >     07:50:20PM
> >      >>>>                                 +0530, Santosh P K wrote:
> >      >>>>                                 >>     Thanks for your
> >     explanation.
> >      >>>>                                 This helps a lot. I would wait
> >     for more
> >      >>>>                                 >> comments from others to see
> if
> >      >>>>                                 this what we need in this
> >     draft to be
> >      >>>>                                 >> supported based on that we
> can
> >      >>>>                                 provide appropriate sections
> >     in the
> >      >>>>                                 draft.
> >      >>>>                                 >
> >      >>>>                                 > The threads on the list have
> >      >>>>                                 spidered to the point where it
> is
> >      >>>>                                 challenging
> >      >>>>                                 > to follow what the current
> >     status
> >      >>>>                                 of the draft is, or should
> >     be.  :-)
> >      >>>>                                 >
> >      >>>>                                 > However, if I've followed
> things
> >      >>>>                                 properly, the question below is
> >      >>>>                                 really the
> >      >>>>                                 > hinge point on what our
> >      >>>>                                 encapsulation for BFD over
> vxlan
> >      >>>>                                 should look like.
> >      >>>>                                 > Correct?
> >      >>>>                                 >
> >      >>>>                                 > Essentially, do we or do we
> not
> >      >>>>                                 require the ability to permit
> >      >>>>                                 multiple BFD
> >      >>>>                                 > sessions between distinct
> VAPs?
> >      >>>>                                 >
> >      >>>>                                 > If this is so, do we have a
> >     sense
> >      >>>>                                 as to how we should proceed?
> >      >>>>                                 >
> >      >>>>                                 > -- Jeff
> >      >>>>                                 >
> >      >>>>                                 > [context preserved below...]
> >      >>>>                                 >
> >      >>>>                                 >> Santosh P K
> >      >>>>                                 >>
> >      >>>>                                 >> On Wed, Sep 25, 2019 at
> 8:10 AM
> >      >>>>                                  >     
> >      >>>>                                  >     >> wrote:
> >      >>>>                                 >>
> >      >>>>                                 >>> Hi Santosh,
> >      >>>>                                 >>>
> >      >>>>                                 >>>
> >      >>>>                                 >>> With regard to the question
> >      >>>>                                 whether we should allow
> >     multiple BFD
> >      >>>>                                 sessions
> >      >>>>                                 >>> for the same VNI or not,
> >     IMHO we
> >      >>>>                                 should allow it, more
> >     explanation as
> >      >>>>                                 >>> follows.
> >      >>>>                                 >>>
> >      >>>>                                 >>> Below is a figure derived
> from
> >      >>>>                                 figure 2 of RFC8014 (An
> >     Architecture for
> >      >>>>                                 >>> Data-Center Network
> >      >>>>                                 Virtualization over Layer 3
> >     (NVO3)).
> >      >>>>                                 >>>
> >      >>>>                                 >>>                      |
> >      >>>>                                  Data Center Network (IP)
>   |
> >      >>>>                                 >>>                      |
> >      >>>>
>  |
> >      >>>>                                 >>>
> >      >>>>
> >       +-----------------------------------------+
> >      >>>>                                 >>>                           |
> >      >>>>                                                      |
> >      >>>>                                 >>>                           |
> >      >>>>                                  Tunnel Overlay      |
> >      >>>>                                 >>>
> >      >>>>                                 +------------+---------+
> >      >>>>                                  +---------+------------+
> >      >>>>                                 >>>              |
> >      >>>>                                 +----------+-------+ |       |
> >      >>>>                                 +-------+----------+ |
> >      >>>>                                 >>>              | |  Overlay
> >      >>>>                                 Module  | |       | |  Overlay
> >      >>>>                                 Module  | |
> >      >>>>                                 >>>              |
> >      >>>>                                 +---------+--------+ |       |
> >      >>>>                                 +---------+--------+ |
> >      >>>>                                 >>>              |           |
> >      >>>>                                     |       |           |
> >          |
> >      >>>>                                 >>>       NVE1   |           |
> >      >>>>                                     |       |           |
> >          |
> >      >>>>                                 NVE2
> >      >>>>                                 >>>              |
> >      >>>>                                 +--------+-------+  |       |
> >      >>>>                                 +--------+-------+  |
> >      >>>>                                 >>>              |  |VNI1
> >     VNI2  VNI1
> >      >>>>                                 |  |       |  | VNI1 VNI2 VNI1
> >     |  |
> >      >>>>                                 >>>              |
> >      >>>>                                 +-+-----+----+---+  |       |
> >      >>>>                                 +-+-----+-----+--+  |
> >      >>>>                                 >>>              |VAP1| VAP2|
>   |
> >      >>>>                                 VAP3 |       |VAP1| VAP2|
> >       | VAP3|
> >      >>>>                                 >>>
> >      >>>>                                 +----+-----+----+------+
> >      >>>>                                  +----+-----+-----+-----+
> >      >>>>                                 >>>                   |     |
> >        |
> >      >>>>                                                  |     |     |
> >      >>>>                                 >>>                   |     |
> >        |
> >      >>>>                                                  |     |     |
> >      >>>>                                 >>>                   |     |
> >        |
> >      >>>>                                                  |     |     |
> >      >>>>                                 >>>
> >      >>>>
> >       -------+-----+----+-------------------+-----+-----+-------
> >      >>>>                                 >>>                   |     |
> >        |
> >      >>>>                                    Tenant        |     |     |
> >      >>>>                                 >>>              TSI1 | TSI2|
>   |
> >      >>>>                                 TSI3          TSI1| TSI2|
> >       |TSI3
> >      >>>>                                 >>>                  +---+
> +---+
> >      >>>>                                 +---+             +---+ +---+
> >       +---+
> >      >>>>                                 >>>                  |TS1|
> |TS2|
> >      >>>>                                 |TS3|             |TS4| |TS5|
> >       |TS6|
> >      >>>>                                 >>>                  +---+
> +---+
> >      >>>>                                 +---+             +---+ +---+
> >       +---+
> >      >>>>                                 >>>
> >      >>>>                                 >>> To my understanding, the
> BFD
> >      >>>>                                 sessions between NVE1 and NVE2
> are
> >      >>>>                                 actually
> >      >>>>                                 >>> initiated and terminated
> >     at VAP
> >      >>>>                                 of NVE.
> >      >>>>                                 >>>
> >      >>>>                                 >>> If the network operator
> >     want to
> >      >>>>                                 set up one BFD session between
> >     VAP1 of
> >      >>>>                                 >>> NVE1 and VAP1of NVE2, at
> the
> >      >>>>                                 same time another BFD session
> >      >>>>                                 between VAP3 of
> >      >>>>                                 >>> NVE1 and VAP3 of NVE2,
> >     although
> >      >>>>                                 the two BFD sessions are for
> >     the same
> >      >>>>                                 >>> VNI1, I believe it's
> >     reasonable,
> >      >>>>                                 so that's why I think we
> >     should allow it
> >      >>>>
> >      >>>>
> >       _______________________________________________
> >      >>>>                                 nvo3 mailing list
> >      >>>> nvo3@ietf.org   >     >
> >      >>>> https://www.ietf.org/mailman/listinfo/nvo3
> >      >>>>
> >
>

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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani 
Cc: Santosh P K , Dinesh Dutt , Greg Mirsky , Jeffrey Haas , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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From: "Joel M. Halpern" 
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I assumed this was only for the case where a tenant VNI was being used.

For the 0 VNI (which is what I prefer), always (MUST) use the loopback 
address.  There are no addresses assigned to the VTEP in that space. 
There is no IRB in that space.

Yours,
Joel

On 10/28/2019 1:58 PM, Anoop Ghanwani wrote:
> Joel,
> 
> Are we going to qualify this by VNI?  There's a bunch of implementations 
> out there that don't use a tenant IP or a loopback with VNI 0--they 
> simply repeat the underlay IP in the inner IPDA.
> 
> Thanks,
> Anoop
> 
> On Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern  > wrote:
> 
>     I can live with saying that you SHOULD use loopback, and MAY instead
>     use
>     an IP address in the customer space known to be owned by the VTEP
>     device
>     when such exists.
> 
>     Yours,
>     Joel
> 
>     On 10/28/2019 1:32 PM, Anoop Ghanwani wrote:
>      > Hi Joel,
>      >
>      > Perhaps we need to say use of an address owned by the device
>     containing
>      > the VTEP.
>      >
>      > Or are you suggesting that the use of the loopback address space
>     is a MUST?
>      >
>      > Anoop
>      >
>      > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern
>     
>      > >> wrote:
>      >
>      >     There is something I am missing in your assumption about IRB.
>      >
>      >     As I understand VxLAN, the VTEP is under the control of the
>     operator.
>      >     As such, it is a pure bridge.  If you run IRB behind it, that
>     is fine.
>      >     Yes, an operator may offer IRB.  But as I understand it, 
>     conceptually,
>      >     in terms of the VxLAN architecture the IRB is an entity
>     behind the
>      >     VTEP,
>      >     not part of the VTEP.
>      >
>      >     Yours,
>      >     Joel
>      >
>      >     On 10/28/2019 12:23 PM, Anoop Ghanwani wrote:
>      >      > Santosh,
>      >      >
>      >      > Does it have to be a MUST?  What if I am running IRB and there
>      >     are IP
>      >      > addresses per VNI assigned to the VTEPs?  Why can the
>     operator not
>      >      > choose to use those?
>      >      >
>      >      > Anoop
>      >      >
>      >      > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K
>      >      >      
>      >          >
>      >          
>      >          >>> wrote:
>      >      >
>      >      >     Dinesh, Anoop et all,
>      >      >           Lets us know if this text works for 127/8
>     address range?
>      >      >
>      >      >     [proposed text for firewall]
>      >      >
>      >      >     "As per section 4 inner destination IP address MUST be
>     set to
>      >     127/8
>      >      >     address. There may be firewall configured on VTEP to
>     block 127/8
>      >      >     address range if set as destination IP in inner IP
>     header. It is
>      >      >     recommended to allow 127/8 range address through
>     firewall only if
>      >      >     127/8 IP address is set as destination address in inner IP
>      >     header."
>      >      >
>      >      >
>      >      >     In section 4 we are talking about using 127/8 and not
>     really
>      >     giving
>      >      >     reason why. I think we should have text as RFC 5884
>     has mentioned
>      >      >     with below text.
>      >      >
>      >      >     [From RFC 5884]
>      >      >     "The motivation for using the address range 127/8 is
>     the same as
>      >      >     specified in Section 2.1 of [RFC4379]
>      >      >     .
>     This is an
>      >      >     exception to the behavior defined in [RFC1122
>      >      >     ]."
>      >      >
>      >      >
>      >      >
>      >      >     Thanks
>      >      >     Santosh P K
>      >      >
>      >      >
>      >      >
>      >      >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt
>     
>      >     >
>      >      >     
>     >>> wrote:
>      >      >
>      >      >         Looks good to me Greg. I see that the text around
>     the use
>      >     of the
>      >      >         inner IP address as also quite acceptable. Will
>     you add any
>      >      >         words about the firewall?
>      >      >
>      >      >         Dinesh
>      >      >
>      >      >         On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky
>      >      >                    >
>      >     
>     >>> wrote:
>      >      >>         Hi Dinesh, et al.,
>      >      >>         please check the updated version that removed the
>      >     reference to
>      >      >>         Hypervisor in the text and Figure 1.
>      >      >>
>      >      >>         Regards,
>      >      >>         Greg
>      >      >>
>      >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K
>      >      >>              
>      >          >
>      >      >>              
>      >          >>> wrote:
>      >      >>
>      >      >>             Dinesh,
>      >      >>                  Please see my inline comments [SPK]
>      >      >>
>      >      >>
>      >      >>                 - In section 3, there's a sentence that
>     is: "BFD
>      >      >>                 packets intended for a Hypervisor VTEP MUST
>      >     NOT..". I
>      >      >>                 recommend getting rid of the word
>     "Hypervisor" ashe
>      >      >>                 logic applies to any VTEP.
>      >      >>
>      >      >>             [SPK] Thanks for comments. We will change this.
>      >      >>
>      >      >>                 - You already explained the precedence of
>     the use of
>      >      >>                 127/8 address in the inner header in
>     MPLS. I have no
>      >      >>                 specific comments in that area. I have
>     only two
>      >      >>                 questions:
>      >      >>                    - Has anybody verified that the use of
>     127/8
>      >      >>                 address (and the right MAC) works with
>     existing
>      >      >>                 implementations, including the silicon
>     ones? If this
>      >      >>                 doesn't work there, is it worth adding the
>      >     possibilit
>      >      >>                 y of another address, one that is owned
>     by the
>      >     VTEP node?
>      >      >>
>      >      >>                    - Do we know if Firewalls stop such VXLAN
>      >     packets?
>      >      >>                 I ask this because VXLAN has an IP header
>     and I
>      >     don't
>      >      >>                 know if firewalls stop packets with 127/8
>     in the
>      >     inner
>      >      >>                 header. If not, is it worth adding a
>     sentence to say
>      >      >>                 that firewalls  allow such packets? The
>     use of a
>      >      >>                 non-127/8 address may alleviate this case
>     as well.
>      >      >>
>      >      >>             [SPK] I think we may need to add the text
>     about firewall
>      >      >>             as some checks in firewall will be there if
>     they are not
>      >      >>             already using MPLS OAM which has inner IP
>     header with
>      >      >>             127/8 address range.
>      >      >>
>      >      >>
>      >      >>                 The rest of the draft looks good to me,
>      >      >>
>      >      >>                 Dinesh
>      >      >>
>      >      >>                 On Wed, Oct 23, 2019 at 7:58 AM, Greg Mirsky
>      >      >>                      
>      >     >
>     
>      >     >>>
>      >      >>                 wrote:
>      >      >>>                 Hi Dinesh,
>      >      >>>                 I greatly appreciate your comments.
>     Please heave a
>      >      >>>                 look at the attached copy of the working
>      >     version and
>      >      >>>                 its diff to -07 (latest in the datatracker).
>      >      >>>
>      >      >>>                 Regards,
>      >      >>>                 Greg
>      >      >>>
>      >      >>>                 On Tue, Oct 22, 2019 at 9:52 PM Dinesh Dutt
>      >      >>>                            >
>      >     
>     >>> wrote:
>      >      >>>
>      >      >>>                     I have the same feeling as Anoop.
>     Greg, can you
>      >      >>>                     please point me to the latest draft
>     so that
>      >     I can
>      >      >>>                     quickly glance through it to be
>     doubly sure,
>      >      >>>
>      >      >>>                     Dinesh
>      >      >>>
>      >      >>>                     On Wed, Oct 23, 2019 at 4:35 AM,
>     Anoop Ghanwani
>      >      >>>                          
>      >     >
>      >      >>>                          
>      >          >>> wrote:
>      >      >>>>                     Greg,
>      >      >>>>
>      >      >>>>                     I think the draft is fine as is.
>      >      >>>>
>      >      >>>>                     I discussion with Xiao Min was
>     about #3 and I
>      >      >>>>                     see that as unnecessary until we
>     have a draft
>      >      >>>>                     that explains why that is needed in the
>      >     context
>      >      >>>>                     of the NVO3 architecture.
>      >      >>>>
>      >      >>>>                     Anoop
>      >      >>>>
>      >      >>>>                     On Tue, Oct 22, 2019 at 11:17 AM
>     Greg Mirsky
>      >      >>>>                          
>      >     >
>      >      >>>>                          
>      >          >>> wrote:
>      >      >>>>
>      >      >>>>                         Hi Anoop, et al.,
>      >      >>>>                         I agree with your understanding
>     of what is
>      >      >>>>                         being defined in the current
>     version
>      >     of the
>      >      >>>>                         BFD over VxLAN specification.
>     But, as I
>      >      >>>>                         understand, the WG is
>     discussing the scope
>      >      >>>>                         before the WGLC is closed. I
>     believe there
>      >      >>>>                         are three options:
>      >      >>>>
>      >      >>>>                          1. single BFD session between
>     two VTEPs
>      >      >>>>                          2. single BFD session per VNI
>     between
>      >     two VTEPs
>      >      >>>>                          3. multiple BFD sessions per
>     VNI between
>      >      >>>>                             two VTEPs
>      >      >>>>
>      >      >>>>                         The current text reflects #2. Is WG
>      >     accepts
>      >      >>>>                         this scope? If not, which
>     option WG would
>      >      >>>>                         accept?
>      >      >>>>
>      >      >>>>                         Regards,
>      >      >>>>                         Greg
>      >      >>>>
>      >      >>>>                         On Tue, Oct 22, 2019 at 2:09 PM
>     Anoop
>      >      >>>>                         Ghanwani      
>      >     >
>      >      >>>>                              
>      >          >>> wrote:
>      >      >>>>
>      >      >>>>                             I concur with Joel's assessment
>      >     with the
>      >      >>>>                             following clarifications.
>      >      >>>>
>      >      >>>>                             The current document is already
>      >     capable
>      >      >>>>                             of monitoring multiple VNIs
>      >     between VTEPs.
>      >      >>>>
>      >      >>>>                             The issue under discussion
>     was how
>      >     do we
>      >      >>>>                             use BFD to monitor multiple
>     VAPs that
>      >      >>>>                             use the same VNI between a
>     pair of
>      >      >>>>                             VTEPs.  The use case for
>     this is not
>      >      >>>>                             clear to me, as from my
>     understanding,
>      >      >>>>                             we cannot have a situation with
>      >     multiple
>      >      >>>>                             VAPs using the same
>     VNI--there is 1:1
>      >      >>>>                             mapping between VAP and VNI.
>      >      >>>>
>      >      >>>>                             Anoop
>      >      >>>>
>      >      >>>>                             On Tue, Oct 22, 2019 at 6:06 AM
>      >     Joel M.
>      >      >>>>                             Halpern
>     
>      >     >
>      >      >>>>                                  
>      >     >>>
>     wrote:
>      >      >>>>
>      >      >>>>                                  From what I can tell,
>     there
>      >     are two
>      >      >>>>                                 separate problems.
>      >      >>>>                                 The document we have is a
>      >     VTEP-VTEP
>      >      >>>>                                 monitoring document. 
>     There is no
>      >      >>>>                                 need for that document to
>      >     handle the
>      >      >>>>                                 multiple VNI case.
>      >      >>>>                                 If folks want a
>     protocol for doing
>      >      >>>>                                 BFD monitoring of things
>      >     behind the
>      >      >>>>                                 VTEPs (multiple VNIs),
>     then do
>      >     that
>      >      >>>>                                 as a separate
>     document.   The
>      >      >>>>                                 encoding will be a tenant
>      >     encoding,
>      >      >>>>                                 and thus sesparate from
>     what is
>      >      >>>>                                 defined in this document.
>      >      >>>>
>      >      >>>>                                 Yours,
>      >      >>>>                                 Joel
>      >      >>>>
>      >      >>>>                                 On 10/21/2019 5:07 PM,
>     Jeffrey
>      >     Haas
>      >      >>>>                                 wrote:
>      >      >>>>                                 > Santosh and others,
>      >      >>>>                                 >
>      >      >>>>                                 > On Thu, Oct 03, 2019 at
>      >     07:50:20PM
>      >      >>>>                                 +0530, Santosh P K wrote:
>      >      >>>>                                 >>     Thanks for your
>      >     explanation.
>      >      >>>>                                 This helps a lot. I
>     would wait
>      >     for more
>      >      >>>>                                 >> comments from others
>     to see if
>      >      >>>>                                 this what we need in this
>      >     draft to be
>      >      >>>>                                 >> supported based on
>     that we can
>      >      >>>>                                 provide appropriate
>     sections
>      >     in the
>      >      >>>>                                 draft.
>      >      >>>>                                 >
>      >      >>>>                                 > The threads on the
>     list have
>      >      >>>>                                 spidered to the point
>     where it is
>      >      >>>>                                 challenging
>      >      >>>>                                 > to follow what the
>     current
>      >     status
>      >      >>>>                                 of the draft is, or should
>      >     be.  :-)
>      >      >>>>                                 >
>      >      >>>>                                 > However, if I've
>     followed things
>      >      >>>>                                 properly, the question
>     below is
>      >      >>>>                                 really the
>      >      >>>>                                 > hinge point on what our
>      >      >>>>                                 encapsulation for BFD
>     over vxlan
>      >      >>>>                                 should look like.
>      >      >>>>                                 > Correct?
>      >      >>>>                                 >
>      >      >>>>                                 > Essentially, do we or
>     do we not
>      >      >>>>                                 require the ability to
>     permit
>      >      >>>>                                 multiple BFD
>      >      >>>>                                 > sessions between
>     distinct VAPs?
>      >      >>>>                                 >
>      >      >>>>                                 > If this is so, do we
>     have a
>      >     sense
>      >      >>>>                                 as to how we should
>     proceed?
>      >      >>>>                                 >
>      >      >>>>                                 > -- Jeff
>      >      >>>>                                 >
>      >      >>>>                                 > [context preserved
>     below...]
>      >      >>>>                                 >
>      >      >>>>                                 >> Santosh P K
>      >      >>>>                                 >>
>      >      >>>>                                 >> On Wed, Sep 25, 2019
>     at 8:10 AM
>      >      >>>>                                      
>      >     >
>      >      >>>>                               
>       
>      >     >>>
>     wrote:
>      >      >>>>                                 >>
>      >      >>>>                                 >>> Hi Santosh,
>      >      >>>>                                 >>>
>      >      >>>>                                 >>>
>      >      >>>>                                 >>> With regard to the
>     question
>      >      >>>>                                 whether we should allow
>      >     multiple BFD
>      >      >>>>                                 sessions
>      >      >>>>                                 >>> for the same VNI or
>     not,
>      >     IMHO we
>      >      >>>>                                 should allow it, more
>      >     explanation as
>      >      >>>>                                 >>> follows.
>      >      >>>>                                 >>>
>      >      >>>>                                 >>> Below is a figure
>     derived from
>      >      >>>>                                 figure 2 of RFC8014 (An
>      >     Architecture for
>      >      >>>>                                 >>> Data-Center Network
>      >      >>>>                                 Virtualization over Layer 3
>      >     (NVO3)).
>      >      >>>>                                 >>>
>      >      >>>>                                 >>>                      |
>      >      >>>>                                  Data Center Network
>     (IP)        |
>      >      >>>>                                 >>>                      |
>      >      >>>>                                                        
>             |
>      >      >>>>                                 >>>
>      >      >>>>
>      >       +-----------------------------------------+
>      >      >>>>                                 >>>                   
>             |
>      >      >>>>                                                      |
>      >      >>>>                                 >>>                   
>             |
>      >      >>>>                                  Tunnel Overlay      |
>      >      >>>>                                 >>>
>      >      >>>>                                 +------------+---------+
>      >      >>>>                                  +---------+------------+
>      >      >>>>                                 >>>              |
>      >      >>>>                                 +----------+-------+ | 
>           |
>      >      >>>>                                 +-------+----------+ |
>      >      >>>>                                 >>>              | | 
>     Overlay
>      >      >>>>                                 Module  | |       | | 
>     Overlay
>      >      >>>>                                 Module  | |
>      >      >>>>                                 >>>              |
>      >      >>>>                                 +---------+--------+ | 
>           |
>      >      >>>>                                 +---------+--------+ |
>      >      >>>>                                 >>>              |     
>           |
>      >      >>>>                                     |       |           |
>      >          |
>      >      >>>>                                 >>>       NVE1   |     
>           |
>      >      >>>>                                     |       |           |
>      >          |
>      >      >>>>                                 NVE2
>      >      >>>>                                 >>>              |
>      >      >>>>                                 +--------+-------+  | 
>           |
>      >      >>>>                                 +--------+-------+  |
>      >      >>>>                                 >>>              |  |VNI1
>      >     VNI2  VNI1
>      >      >>>>                                 |  |       |  | VNI1
>     VNI2 VNI1
>      >     |  |
>      >      >>>>                                 >>>              |
>      >      >>>>                                 +-+-----+----+---+  | 
>           |
>      >      >>>>                                 +-+-----+-----+--+  |
>      >      >>>>                                 >>>              |VAP1|
>     VAP2|    |
>      >      >>>>                                 VAP3 |       |VAP1| VAP2|
>      >       | VAP3|
>      >      >>>>                                 >>>
>      >      >>>>                                 +----+-----+----+------+
>      >      >>>>                                  +----+-----+-----+-----+
>      >      >>>>                                 >>>                 
>       |     |
>      >        |
>      >      >>>>                                                  |   
>       |     |
>      >      >>>>                                 >>>                 
>       |     |
>      >        |
>      >      >>>>                                                  |   
>       |     |
>      >      >>>>                                 >>>                 
>       |     |
>      >        |
>      >      >>>>                                                  |   
>       |     |
>      >      >>>>                                 >>>
>      >      >>>>
>      >       -------+-----+----+-------------------+-----+-----+-------
>      >      >>>>                                 >>>                 
>       |     |
>      >        |
>      >      >>>>                                    Tenant        |   
>       |     |
>      >      >>>>                                 >>>              TSI1 |
>     TSI2|    |
>      >      >>>>                                 TSI3          TSI1| TSI2|
>      >       |TSI3
>      >      >>>>                                 >>>                 
>     +---+ +---+
>      >      >>>>                                 +---+             +---+
>     +---+
>      >       +---+
>      >      >>>>                                 >>>                 
>     |TS1| |TS2|
>      >      >>>>                                 |TS3|             |TS4|
>     |TS5|
>      >       |TS6|
>      >      >>>>                                 >>>                 
>     +---+ +---+
>      >      >>>>                                 +---+             +---+
>     +---+
>      >       +---+
>      >      >>>>                                 >>>
>      >      >>>>                                 >>> To my
>     understanding, the BFD
>      >      >>>>                                 sessions between NVE1
>     and NVE2 are
>      >      >>>>                                 actually
>      >      >>>>                                 >>> initiated and
>     terminated
>      >     at VAP
>      >      >>>>                                 of NVE.
>      >      >>>>                                 >>>
>      >      >>>>                                 >>> If the network operator
>      >     want to
>      >      >>>>                                 set up one BFD session
>     between
>      >     VAP1 of
>      >      >>>>                                 >>> NVE1 and VAP1of
>     NVE2, at the
>      >      >>>>                                 same time another BFD
>     session
>      >      >>>>                                 between VAP3 of
>      >      >>>>                                 >>> NVE1 and VAP3 of NVE2,
>      >     although
>      >      >>>>                                 the two BFD sessions
>     are for
>      >     the same
>      >      >>>>                                 >>> VNI1, I believe it's
>      >     reasonable,
>      >      >>>>                                 so that's why I think we
>      >     should allow it
>      >      >>>>
>      >      >>>>
>      >       _______________________________________________
>      >      >>>>                                 nvo3 mailing list
>      >      >>>> nvo3@ietf.org 
>     >      
>      >     >>
>      >      >>>> https://www.ietf.org/mailman/listinfo/nvo3
>      >      >>>>
>      >
> 


From nobody Mon Oct 28 11:39:12 2019
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In-Reply-To: 
From: Anoop Ghanwani 
Date: Mon, 28 Oct 2019 11:30:00 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: "Joel M. Halpern" 
Cc: Santosh P K , Dinesh Dutt , Greg Mirsky , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Joel,

Writing the spec in that way would make the current, inter-operable
implementation of multiple vendors non-compliant with the spec.

Thanks,
Anoop

On Mon, Oct 28, 2019 at 11:07 AM Joel M. Halpern 
wrote:

> I assumed this was only for the case where a tenant VNI was being used.
>
> For the 0 VNI (which is what I prefer), always (MUST) use the loopback
> address.  There are no addresses assigned to the VTEP in that space.
> There is no IRB in that space.
>
> Yours,
> Joel
>
> On 10/28/2019 1:58 PM, Anoop Ghanwani wrote:
> > Joel,
> >
> > Are we going to qualify this by VNI?  There's a bunch of implementations
> > out there that don't use a tenant IP or a loopback with VNI 0--they
> > simply repeat the underlay IP in the inner IPDA.
> >
> > Thanks,
> > Anoop
> >
> > On Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern  > > wrote:
> >
> >     I can live with saying that you SHOULD use loopback, and MAY instead
> >     use
> >     an IP address in the customer space known to be owned by the VTEP
> >     device
> >     when such exists.
> >
> >     Yours,
> >     Joel
> >
> >     On 10/28/2019 1:32 PM, Anoop Ghanwani wrote:
> >      > Hi Joel,
> >      >
> >      > Perhaps we need to say use of an address owned by the device
> >     containing
> >      > the VTEP.
> >      >
> >      > Or are you suggesting that the use of the loopback address space
> >     is a MUST?
> >      >
> >      > Anoop
> >      >
> >      > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern
> >     
> >      > >> wrote:
> >      >
> >      >     There is something I am missing in your assumption about IRB.
> >      >
> >      >     As I understand VxLAN, the VTEP is under the control of the
> >     operator.
> >      >     As such, it is a pure bridge.  If you run IRB behind it, that
> >     is fine.
> >      >     Yes, an operator may offer IRB.  But as I understand it,
> >     conceptually,
> >      >     in terms of the VxLAN architecture the IRB is an entity
> >     behind the
> >      >     VTEP,
> >      >     not part of the VTEP.
> >      >
> >      >     Yours,
> >      >     Joel
> >      >
> >      >     On 10/28/2019 12:23 PM, Anoop Ghanwani wrote:
> >      >      > Santosh,
> >      >      >
> >      >      > Does it have to be a MUST?  What if I am running IRB and
> there
> >      >     are IP
> >      >      > addresses per VNI assigned to the VTEPs?  Why can the
> >     operator not
> >      >      > choose to use those?
> >      >      >
> >      >      > Anoop
> >      >      >
> >      >      > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K
> >      >      >  >     
> >      >      >     >
> >      >      >     
> >      >      >     >>> wrote:
> >      >      >
> >      >      >     Dinesh, Anoop et all,
> >      >      >           Lets us know if this text works for 127/8
> >     address range?
> >      >      >
> >      >      >     [proposed text for firewall]
> >      >      >
> >      >      >     "As per section 4 inner destination IP address MUST be
> >     set to
> >      >     127/8
> >      >      >     address. There may be firewall configured on VTEP to
> >     block 127/8
> >      >      >     address range if set as destination IP in inner IP
> >     header. It is
> >      >      >     recommended to allow 127/8 range address through
> >     firewall only if
> >      >      >     127/8 IP address is set as destination address in
> inner IP
> >      >     header."
> >      >      >
> >      >      >
> >      >      >     In section 4 we are talking about using 127/8 and not
> >     really
> >      >     giving
> >      >      >     reason why. I think we should have text as RFC 5884
> >     has mentioned
> >      >      >     with below text.
> >      >      >
> >      >      >     [From RFC 5884]
> >      >      >     "The motivation for using the address range 127/8 is
> >     the same as
> >      >      >     specified in Section 2.1 of [RFC4379]
> >      >      >     .
> >     This is an
> >      >      >     exception to the behavior defined in [RFC1122
> >      >      >     ]."
> >      >      >
> >      >      >
> >      >      >
> >      >      >     Thanks
> >      >      >     Santosh P K
> >      >      >
> >      >      >
> >      >      >
> >      >      >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt
> >     
> >      >     >
> >      >      >     
> >     >>> wrote:
> >      >      >
> >      >      >         Looks good to me Greg. I see that the text around
> >     the use
> >      >     of the
> >      >      >         inner IP address as also quite acceptable. Will
> >     you add any
> >      >      >         words about the firewall?
> >      >      >
> >      >      >         Dinesh
> >      >      >
> >      >      >         On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky
> >      >      >          >       >     >
> >      >     
> >     >>>
> wrote:
> >      >      >>         Hi Dinesh, et al.,
> >      >      >>         please check the updated version that removed the
> >      >     reference to
> >      >      >>         Hypervisor in the text and Figure 1.
> >      >      >>
> >      >      >>         Regards,
> >      >      >>         Greg
> >      >      >>
> >      >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K
> >      >      >>          >     
> >      >      >     >
> >      >      >>          >     
> >      >      >     >>> wrote:
> >      >      >>
> >      >      >>             Dinesh,
> >      >      >>                  Please see my inline comments [SPK]
> >      >      >>
> >      >      >>
> >      >      >>                 - In section 3, there's a sentence that
> >     is: "BFD
> >      >      >>                 packets intended for a Hypervisor VTEP
> MUST
> >      >     NOT..". I
> >      >      >>                 recommend getting rid of the word
> >     "Hypervisor" ashe
> >      >      >>                 logic applies to any VTEP.
> >      >      >>
> >      >      >>             [SPK] Thanks for comments. We will change
> this.
> >      >      >>
> >      >      >>                 - You already explained the precedence of
> >     the use of
> >      >      >>                 127/8 address in the inner header in
> >     MPLS. I have no
> >      >      >>                 specific comments in that area. I have
> >     only two
> >      >      >>                 questions:
> >      >      >>                    - Has anybody verified that the use of
> >     127/8
> >      >      >>                 address (and the right MAC) works with
> >     existing
> >      >      >>                 implementations, including the silicon
> >     ones? If this
> >      >      >>                 doesn't work there, is it worth adding the
> >      >     possibilit
> >      >      >>                 y of another address, one that is owned
> >     by the
> >      >     VTEP node?
> >      >      >>
> >      >      >>                    - Do we know if Firewalls stop such
> VXLAN
> >      >     packets?
> >      >      >>                 I ask this because VXLAN has an IP header
> >     and I
> >      >     don't
> >      >      >>                 know if firewalls stop packets with 127/8
> >     in the
> >      >     inner
> >      >      >>                 header. If not, is it worth adding a
> >     sentence to say
> >      >      >>                 that firewalls  allow such packets? The
> >     use of a
> >      >      >>                 non-127/8 address may alleviate this case
> >     as well.
> >      >      >>
> >      >      >>             [SPK] I think we may need to add the text
> >     about firewall
> >      >      >>             as some checks in firewall will be there if
> >     they are not
> >      >      >>             already using MPLS OAM which has inner IP
> >     header with
> >      >      >>             127/8 address range.
> >      >      >>
> >      >      >>
> >      >      >>                 The rest of the draft looks good to me,
> >      >      >>
> >      >      >>                 Dinesh
> >      >      >>
> >      >      >>                 On Wed, Oct 23, 2019 at 7:58 AM, Greg
> Mirsky
> >      >      >>                  >     
> >      >     >
> >     
> >      >      >>>>
> >      >      >>                 wrote:
> >      >      >>>                 Hi Dinesh,
> >      >      >>>                 I greatly appreciate your comments.
> >     Please heave a
> >      >      >>>                 look at the attached copy of the working
> >      >     version and
> >      >      >>>                 its diff to -07 (latest in the
> datatracker).
> >      >      >>>
> >      >      >>>                 Regards,
> >      >      >>>                 Greg
> >      >      >>>
> >      >      >>>                 On Tue, Oct 22, 2019 at 9:52 PM Dinesh
> Dutt
> >      >      >>>                  >       >     >
> >      >     
> >     >>> wrote:
> >      >      >>>
> >      >      >>>                     I have the same feeling as Anoop.
> >     Greg, can you
> >      >      >>>                     please point me to the latest draft
> >     so that
> >      >     I can
> >      >      >>>                     quickly glance through it to be
> >     doubly sure,
> >      >      >>>
> >      >      >>>                     Dinesh
> >      >      >>>
> >      >      >>>                     On Wed, Oct 23, 2019 at 4:35 AM,
> >     Anoop Ghanwani
> >      >      >>>                      >     
> >      >     >
> >      >      >>>                      >     
> >      >      >     >>> wrote:
> >      >      >>>>                     Greg,
> >      >      >>>>
> >      >      >>>>                     I think the draft is fine as is.
> >      >      >>>>
> >      >      >>>>                     I discussion with Xiao Min was
> >     about #3 and I
> >      >      >>>>                     see that as unnecessary until we
> >     have a draft
> >      >      >>>>                     that explains why that is needed in
> the
> >      >     context
> >      >      >>>>                     of the NVO3 architecture.
> >      >      >>>>
> >      >      >>>>                     Anoop
> >      >      >>>>
> >      >      >>>>                     On Tue, Oct 22, 2019 at 11:17 AM
> >     Greg Mirsky
> >      >      >>>>                      >     
> >      >     >
> >      >      >>>>                      >     
> >      >      >     >>> wrote:
> >      >      >>>>
> >      >      >>>>                         Hi Anoop, et al.,
> >      >      >>>>                         I agree with your understanding
> >     of what is
> >      >      >>>>                         being defined in the current
> >     version
> >      >     of the
> >      >      >>>>                         BFD over VxLAN specification.
> >     But, as I
> >      >      >>>>                         understand, the WG is
> >     discussing the scope
> >      >      >>>>                         before the WGLC is closed. I
> >     believe there
> >      >      >>>>                         are three options:
> >      >      >>>>
> >      >      >>>>                          1. single BFD session between
> >     two VTEPs
> >      >      >>>>                          2. single BFD session per VNI
> >     between
> >      >     two VTEPs
> >      >      >>>>                          3. multiple BFD sessions per
> >     VNI between
> >      >      >>>>                             two VTEPs
> >      >      >>>>
> >      >      >>>>                         The current text reflects #2.
> Is WG
> >      >     accepts
> >      >      >>>>                         this scope? If not, which
> >     option WG would
> >      >      >>>>                         accept?
> >      >      >>>>
> >      >      >>>>                         Regards,
> >      >      >>>>                         Greg
> >      >      >>>>
> >      >      >>>>                         On Tue, Oct 22, 2019 at 2:09 PM
> >     Anoop
> >      >      >>>>                         Ghanwani  >     
> >      >     >
> >      >      >>>>                          >     
> >      >      >     >>> wrote:
> >      >      >>>>
> >      >      >>>>                             I concur with Joel's
> assessment
> >      >     with the
> >      >      >>>>                             following clarifications.
> >      >      >>>>
> >      >      >>>>                             The current document is
> already
> >      >     capable
> >      >      >>>>                             of monitoring multiple VNIs
> >      >     between VTEPs.
> >      >      >>>>
> >      >      >>>>                             The issue under discussion
> >     was how
> >      >     do we
> >      >      >>>>                             use BFD to monitor multiple
> >     VAPs that
> >      >      >>>>                             use the same VNI between a
> >     pair of
> >      >      >>>>                             VTEPs.  The use case for
> >     this is not
> >      >      >>>>                             clear to me, as from my
> >     understanding,
> >      >      >>>>                             we cannot have a situation
> with
> >      >     multiple
> >      >      >>>>                             VAPs using the same
> >     VNI--there is 1:1
> >      >      >>>>                             mapping between VAP and VNI.
> >      >      >>>>
> >      >      >>>>                             Anoop
> >      >      >>>>
> >      >      >>>>                             On Tue, Oct 22, 2019 at
> 6:06 AM
> >      >     Joel M.
> >      >      >>>>                             Halpern
> >     
> >      >     >
> >      >      >>>>                              >     
> >      >     >>>
> >     wrote:
> >      >      >>>>
> >      >      >>>>                                  From what I can tell,
> >     there
> >      >     are two
> >      >      >>>>                                 separate problems.
> >      >      >>>>                                 The document we have is
> a
> >      >     VTEP-VTEP
> >      >      >>>>                                 monitoring document.
> >     There is no
> >      >      >>>>                                 need for that document
> to
> >      >     handle the
> >      >      >>>>                                 multiple VNI case.
> >      >      >>>>                                 If folks want a
> >     protocol for doing
> >      >      >>>>                                 BFD monitoring of things
> >      >     behind the
> >      >      >>>>                                 VTEPs (multiple VNIs),
> >     then do
> >      >     that
> >      >      >>>>                                 as a separate
> >     document.   The
> >      >      >>>>                                 encoding will be a
> tenant
> >      >     encoding,
> >      >      >>>>                                 and thus sesparate from
> >     what is
> >      >      >>>>                                 defined in this
> document.
> >      >      >>>>
> >      >      >>>>                                 Yours,
> >      >      >>>>                                 Joel
> >      >      >>>>
> >      >      >>>>                                 On 10/21/2019 5:07 PM,
> >     Jeffrey
> >      >     Haas
> >      >      >>>>                                 wrote:
> >      >      >>>>                                 > Santosh and others,
> >      >      >>>>                                 >
> >      >      >>>>                                 > On Thu, Oct 03, 2019
> at
> >      >     07:50:20PM
> >      >      >>>>                                 +0530, Santosh P K
> wrote:
> >      >      >>>>                                 >>     Thanks for your
> >      >     explanation.
> >      >      >>>>                                 This helps a lot. I
> >     would wait
> >      >     for more
> >      >      >>>>                                 >> comments from others
> >     to see if
> >      >      >>>>                                 this what we need in
> this
> >      >     draft to be
> >      >      >>>>                                 >> supported based on
> >     that we can
> >      >      >>>>                                 provide appropriate
> >     sections
> >      >     in the
> >      >      >>>>                                 draft.
> >      >      >>>>                                 >
> >      >      >>>>                                 > The threads on the
> >     list have
> >      >      >>>>                                 spidered to the point
> >     where it is
> >      >      >>>>                                 challenging
> >      >      >>>>                                 > to follow what the
> >     current
> >      >     status
> >      >      >>>>                                 of the draft is, or
> should
> >      >     be.  :-)
> >      >      >>>>                                 >
> >      >      >>>>                                 > However, if I've
> >     followed things
> >      >      >>>>                                 properly, the question
> >     below is
> >      >      >>>>                                 really the
> >      >      >>>>                                 > hinge point on what
> our
> >      >      >>>>                                 encapsulation for BFD
> >     over vxlan
> >      >      >>>>                                 should look like.
> >      >      >>>>                                 > Correct?
> >      >      >>>>                                 >
> >      >      >>>>                                 > Essentially, do we or
> >     do we not
> >      >      >>>>                                 require the ability to
> >     permit
> >      >      >>>>                                 multiple BFD
> >      >      >>>>                                 > sessions between
> >     distinct VAPs?
> >      >      >>>>                                 >
> >      >      >>>>                                 > If this is so, do we
> >     have a
> >      >     sense
> >      >      >>>>                                 as to how we should
> >     proceed?
> >      >      >>>>                                 >
> >      >      >>>>                                 > -- Jeff
> >      >      >>>>                                 >
> >      >      >>>>                                 > [context preserved
> >     below...]
> >      >      >>>>                                 >
> >      >      >>>>                                 >> Santosh P K
> >      >      >>>>                                 >>
> >      >      >>>>                                 >> On Wed, Sep 25, 2019
> >     at 8:10 AM
> >      >      >>>>                                  >     
> >      >     >
> >      >      >>>>
> >       
> >      >     >>>
> >     wrote:
> >      >      >>>>                                 >>
> >      >      >>>>                                 >>> Hi Santosh,
> >      >      >>>>                                 >>>
> >      >      >>>>                                 >>>
> >      >      >>>>                                 >>> With regard to the
> >     question
> >      >      >>>>                                 whether we should allow
> >      >     multiple BFD
> >      >      >>>>                                 sessions
> >      >      >>>>                                 >>> for the same VNI or
> >     not,
> >      >     IMHO we
> >      >      >>>>                                 should allow it, more
> >      >     explanation as
> >      >      >>>>                                 >>> follows.
> >      >      >>>>                                 >>>
> >      >      >>>>                                 >>> Below is a figure
> >     derived from
> >      >      >>>>                                 figure 2 of RFC8014 (An
> >      >     Architecture for
> >      >      >>>>                                 >>> Data-Center Network
> >      >      >>>>                                 Virtualization over
> Layer 3
> >      >     (NVO3)).
> >      >      >>>>                                 >>>
> >      >      >>>>                                 >>>
>   |
> >      >      >>>>                                  Data Center Network
> >     (IP)        |
> >      >      >>>>                                 >>>
>   |
> >      >      >>>>
> >             |
> >      >      >>>>                                 >>>
> >      >      >>>>
> >      >       +-----------------------------------------+
> >      >      >>>>                                 >>>
> >             |
> >      >      >>>>                                                      |
> >      >      >>>>                                 >>>
> >             |
> >      >      >>>>                                  Tunnel Overlay      |
> >      >      >>>>                                 >>>
> >      >      >>>>                                 +------------+---------+
> >      >      >>>>
>   +---------+------------+
> >      >      >>>>                                 >>>              |
> >      >      >>>>                                 +----------+-------+ |
> >           |
> >      >      >>>>                                 +-------+----------+ |
> >      >      >>>>                                 >>>              | |
> >     Overlay
> >      >      >>>>                                 Module  | |       | |
> >     Overlay
> >      >      >>>>                                 Module  | |
> >      >      >>>>                                 >>>              |
> >      >      >>>>                                 +---------+--------+ |
> >           |
> >      >      >>>>                                 +---------+--------+ |
> >      >      >>>>                                 >>>              |
> >           |
> >      >      >>>>                                     |       |
>  |
> >      >          |
> >      >      >>>>                                 >>>       NVE1   |
> >           |
> >      >      >>>>                                     |       |
>  |
> >      >          |
> >      >      >>>>                                 NVE2
> >      >      >>>>                                 >>>              |
> >      >      >>>>                                 +--------+-------+  |
> >           |
> >      >      >>>>                                 +--------+-------+  |
> >      >      >>>>                                 >>>              |
> |VNI1
> >      >     VNI2  VNI1
> >      >      >>>>                                 |  |       |  | VNI1
> >     VNI2 VNI1
> >      >     |  |
> >      >      >>>>                                 >>>              |
> >      >      >>>>                                 +-+-----+----+---+  |
> >           |
> >      >      >>>>                                 +-+-----+-----+--+  |
> >      >      >>>>                                 >>>              |VAP1|
> >     VAP2|    |
> >      >      >>>>                                 VAP3 |       |VAP1|
> VAP2|
> >      >       | VAP3|
> >      >      >>>>                                 >>>
> >      >      >>>>                                 +----+-----+----+------+
> >      >      >>>>
>   +----+-----+-----+-----+
> >      >      >>>>                                 >>>
> >       |     |
> >      >        |
> >      >      >>>>                                                  |
> >       |     |
> >      >      >>>>                                 >>>
> >       |     |
> >      >        |
> >      >      >>>>                                                  |
> >       |     |
> >      >      >>>>                                 >>>
> >       |     |
> >      >        |
> >      >      >>>>                                                  |
> >       |     |
> >      >      >>>>                                 >>>
> >      >      >>>>
> >      >       -------+-----+----+-------------------+-----+-----+-------
> >      >      >>>>                                 >>>
> >       |     |
> >      >        |
> >      >      >>>>                                    Tenant        |
> >       |     |
> >      >      >>>>                                 >>>              TSI1 |
> >     TSI2|    |
> >      >      >>>>                                 TSI3          TSI1|
> TSI2|
> >      >       |TSI3
> >      >      >>>>                                 >>>
> >     +---+ +---+
> >      >      >>>>                                 +---+             +---+
> >     +---+
> >      >       +---+
> >      >      >>>>                                 >>>
> >     |TS1| |TS2|
> >      >      >>>>                                 |TS3|             |TS4|
> >     |TS5|
> >      >       |TS6|
> >      >      >>>>                                 >>>
> >     +---+ +---+
> >      >      >>>>                                 +---+             +---+
> >     +---+
> >      >       +---+
> >      >      >>>>                                 >>>
> >      >      >>>>                                 >>> To my
> >     understanding, the BFD
> >      >      >>>>                                 sessions between NVE1
> >     and NVE2 are
> >      >      >>>>                                 actually
> >      >      >>>>                                 >>> initiated and
> >     terminated
> >      >     at VAP
> >      >      >>>>                                 of NVE.
> >      >      >>>>                                 >>>
> >      >      >>>>                                 >>> If the network
> operator
> >      >     want to
> >      >      >>>>                                 set up one BFD session
> >     between
> >      >     VAP1 of
> >      >      >>>>                                 >>> NVE1 and VAP1of
> >     NVE2, at the
> >      >      >>>>                                 same time another BFD
> >     session
> >      >      >>>>                                 between VAP3 of
> >      >      >>>>                                 >>> NVE1 and VAP3 of
> NVE2,
> >      >     although
> >      >      >>>>                                 the two BFD sessions
> >     are for
> >      >     the same
> >      >      >>>>                                 >>> VNI1, I believe it's
> >      >     reasonable,
> >      >      >>>>                                 so that's why I think we
> >      >     should allow it
> >      >      >>>>
> >      >      >>>>
> >      >       _______________________________________________
> >      >      >>>>                                 nvo3 mailing list
> >      >      >>>> nvo3@ietf.org 
> >     >  >     
> >      >     >>
> >      >      >>>> https://www.ietf.org/mailman/listinfo/nvo3
> >      >      >>>>
> >      >
> >
>

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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani 
Cc: Santosh P K , Dinesh Dutt , Greg Mirsky , Jeffrey Haas , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
References:   <1571795542.10436.5@smtp.gmail.com>  <1571798869.2855.1@smtp.gmail.com>   <1571860470.2855.11@smtp.gmail.com>   <88a1320e-093a-a101-d8a6-6ae6d7648466@joelhalpern.com>     
From: "Joel M. Halpern" 
Message-ID: <97bdb8b4-b334-53fb-05a6-2d1fc8684ad3@joelhalpern.com>
Date: Mon, 28 Oct 2019 15:55:25 -0400
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You are saying that there are existing implementations using VNI 0 for 
this?  Given that previous versions of the spec explicitly disallowed 
VNI 0, I am having trouble with your objecting that a spec for how to 
run over VNI 0 breask existing implementations.

Note that when there is a good technical reason, the IETF does change 
Internet Drafts in ways that break early implementations.  That is the 
price of standardization.

Yours,
Joel

On 10/28/2019 2:30 PM, Anoop Ghanwani wrote:
> Hi Joel,
> 
> Writing the spec in that way would make the current, inter-operable 
> implementation of multiple vendors non-compliant with the spec.
> 
> Thanks,
> Anoop
> 
> On Mon, Oct 28, 2019 at 11:07 AM Joel M. Halpern  > wrote:
> 
>     I assumed this was only for the case where a tenant VNI was being used.
> 
>     For the 0 VNI (which is what I prefer), always (MUST) use the loopback
>     address.  There are no addresses assigned to the VTEP in that space.
>     There is no IRB in that space.
> 
>     Yours,
>     Joel
> 
>     On 10/28/2019 1:58 PM, Anoop Ghanwani wrote:
>      > Joel,
>      >
>      > Are we going to qualify this by VNI?  There's a bunch of
>     implementations
>      > out there that don't use a tenant IP or a loopback with VNI 0--they
>      > simply repeat the underlay IP in the inner IPDA.
>      >
>      > Thanks,
>      > Anoop
>      >
>      > On Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern
>     
>      > >> wrote:
>      >
>      >     I can live with saying that you SHOULD use loopback, and MAY
>     instead
>      >     use
>      >     an IP address in the customer space known to be owned by the VTEP
>      >     device
>      >     when such exists.
>      >
>      >     Yours,
>      >     Joel
>      >
>      >     On 10/28/2019 1:32 PM, Anoop Ghanwani wrote:
>      >      > Hi Joel,
>      >      >
>      >      > Perhaps we need to say use of an address owned by the device
>      >     containing
>      >      > the VTEP.
>      >      >
>      >      > Or are you suggesting that the use of the loopback address
>     space
>      >     is a MUST?
>      >      >
>      >      > Anoop
>      >      >
>      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern
>      >     
>     >
>      >      > 
>     >>> wrote:
>      >      >
>      >      >     There is something I am missing in your assumption
>     about IRB.
>      >      >
>      >      >     As I understand VxLAN, the VTEP is under the control
>     of the
>      >     operator.
>      >      >     As such, it is a pure bridge.  If you run IRB behind
>     it, that
>      >     is fine.
>      >      >     Yes, an operator may offer IRB.  But as I understand it,
>      >     conceptually,
>      >      >     in terms of the VxLAN architecture the IRB is an entity
>      >     behind the
>      >      >     VTEP,
>      >      >     not part of the VTEP.
>      >      >
>      >      >     Yours,
>      >      >     Joel
>      >      >
>      >      >     On 10/28/2019 12:23 PM, Anoop Ghanwani wrote:
>      >      >      > Santosh,
>      >      >      >
>      >      >      > Does it have to be a MUST?  What if I am running
>     IRB and there
>      >      >     are IP
>      >      >      > addresses per VNI assigned to the VTEPs?  Why can the
>      >     operator not
>      >      >      > choose to use those?
>      >      >      >
>      >      >      > Anoop
>      >      >      >
>      >      >      > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K
>      >      >      >      
>      >          >
>      >      >          
>      >          >>
>      >      >          
>      >          >
>      >      >          
>      >          >>>> wrote:
>      >      >      >
>      >      >      >     Dinesh, Anoop et all,
>      >      >      >           Lets us know if this text works for 127/8
>      >     address range?
>      >      >      >
>      >      >      >     [proposed text for firewall]
>      >      >      >
>      >      >      >     "As per section 4 inner destination IP address
>     MUST be
>      >     set to
>      >      >     127/8
>      >      >      >     address. There may be firewall configured on
>     VTEP to
>      >     block 127/8
>      >      >      >     address range if set as destination IP in inner IP
>      >     header. It is
>      >      >      >     recommended to allow 127/8 range address through
>      >     firewall only if
>      >      >      >     127/8 IP address is set as destination address
>     in inner IP
>      >      >     header."
>      >      >      >
>      >      >      >
>      >      >      >     In section 4 we are talking about using 127/8
>     and not
>      >     really
>      >      >     giving
>      >      >      >     reason why. I think we should have text as RFC 5884
>      >     has mentioned
>      >      >      >     with below text.
>      >      >      >
>      >      >      >     [From RFC 5884]
>      >      >      >     "The motivation for using the address range
>     127/8 is
>      >     the same as
>      >      >      >     specified in Section 2.1 of [RFC4379]
>      >      >      >     .
>      >     This is an
>      >      >      >     exception to the behavior defined in [RFC1122
>      >      >      >     ]."
>      >      >      >
>      >      >      >
>      >      >      >
>      >      >      >     Thanks
>      >      >      >     Santosh P K
>      >      >      >
>      >      >      >
>      >      >      >
>      >      >      >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt
>      >     
>     >
>      >      >     
>     >>
>      >      >      >                >
>      >     
>     >>>> wrote:
>      >      >      >
>      >      >      >         Looks good to me Greg. I see that the text
>     around
>      >     the use
>      >      >     of the
>      >      >      >         inner IP address as also quite acceptable. Will
>      >     you add any
>      >      >      >         words about the firewall?
>      >      >      >
>      >      >      >         Dinesh
>      >      >      >
>      >      >      >         On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky
>      >      >      >              
>      >     >
>     
>      >     >>
>      >      >                >
>      >     
>     >>>> wrote:
>      >      >      >>         Hi Dinesh, et al.,
>      >      >      >>         please check the updated version that
>     removed the
>      >      >     reference to
>      >      >      >>         Hypervisor in the text and Figure 1.
>      >      >      >>
>      >      >      >>         Regards,
>      >      >      >>         Greg
>      >      >      >>
>      >      >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K
>      >      >      >>              
>      >          >
>      >      >          
>      >          >>
>      >      >      >>              
>      >          >
>      >      >          
>      >          >>>> wrote:
>      >      >      >>
>      >      >      >>             Dinesh,
>      >      >      >>                  Please see my inline comments [SPK]
>      >      >      >>
>      >      >      >>
>      >      >      >>                 - In section 3, there's a sentence
>     that
>      >     is: "BFD
>      >      >      >>                 packets intended for a Hypervisor
>     VTEP MUST
>      >      >     NOT..". I
>      >      >      >>                 recommend getting rid of the word
>      >     "Hypervisor" ashe
>      >      >      >>                 logic applies to any VTEP.
>      >      >      >>
>      >      >      >>             [SPK] Thanks for comments. We will
>     change this.
>      >      >      >>
>      >      >      >>                 - You already explained the
>     precedence of
>      >     the use of
>      >      >      >>                 127/8 address in the inner header in
>      >     MPLS. I have no
>      >      >      >>                 specific comments in that area. I have
>      >     only two
>      >      >      >>                 questions:
>      >      >      >>                    - Has anybody verified that the
>     use of
>      >     127/8
>      >      >      >>                 address (and the right MAC) works with
>      >     existing
>      >      >      >>                 implementations, including the silicon
>      >     ones? If this
>      >      >      >>                 doesn't work there, is it worth
>     adding the
>      >      >     possibilit
>      >      >      >>                 y of another address, one that is
>     owned
>      >     by the
>      >      >     VTEP node?
>      >      >      >>
>      >      >      >>                    - Do we know if Firewalls stop
>     such VXLAN
>      >      >     packets?
>      >      >      >>                 I ask this because VXLAN has an IP
>     header
>      >     and I
>      >      >     don't
>      >      >      >>                 know if firewalls stop packets
>     with 127/8
>      >     in the
>      >      >     inner
>      >      >      >>                 header. If not, is it worth adding a
>      >     sentence to say
>      >      >      >>                 that firewalls  allow such
>     packets? The
>      >     use of a
>      >      >      >>                 non-127/8 address may alleviate
>     this case
>      >     as well.
>      >      >      >>
>      >      >      >>             [SPK] I think we may need to add the text
>      >     about firewall
>      >      >      >>             as some checks in firewall will be
>     there if
>      >     they are not
>      >      >      >>             already using MPLS OAM which has inner IP
>      >     header with
>      >      >      >>             127/8 address range.
>      >      >      >>
>      >      >      >>
>      >      >      >>                 The rest of the draft looks good
>     to me,
>      >      >      >>
>      >      >      >>                 Dinesh
>      >      >      >>
>      >      >      >>                 On Wed, Oct 23, 2019 at 7:58 AM,
>     Greg Mirsky
>      >      >      >>                      
>      >     >
>      >      >                >>
>      >     
>     >
>      >      >                >>>>
>      >      >      >>                 wrote:
>      >      >      >>>                 Hi Dinesh,
>      >      >      >>>                 I greatly appreciate your comments.
>      >     Please heave a
>      >      >      >>>                 look at the attached copy of the
>     working
>      >      >     version and
>      >      >      >>>                 its diff to -07 (latest in the
>     datatracker).
>      >      >      >>>
>      >      >      >>>                 Regards,
>      >      >      >>>                 Greg
>      >      >      >>>
>      >      >      >>>                 On Tue, Oct 22, 2019 at 9:52 PM
>     Dinesh Dutt
>      >      >      >>>                      
>      >     >
>     
>      >     >>
>      >      >     
>     >
>      >     
>     >>>> wrote:
>      >      >      >>>
>      >      >      >>>                     I have the same feeling as Anoop.
>      >     Greg, can you
>      >      >      >>>                     please point me to the latest
>     draft
>      >     so that
>      >      >     I can
>      >      >      >>>                     quickly glance through it to be
>      >     doubly sure,
>      >      >      >>>
>      >      >      >>>                     Dinesh
>      >      >      >>>
>      >      >      >>>                     On Wed, Oct 23, 2019 at 4:35 AM,
>      >     Anoop Ghanwani
>      >      >      >>>                          
>      >     >
>      >      >                >>
>      >      >      >>>                          
>      >     >
>      >      >          
>      >          >>>> wrote:
>      >      >      >>>>                     Greg,
>      >      >      >>>>
>      >      >      >>>>                     I think the draft is fine as is.
>      >      >      >>>>
>      >      >      >>>>                     I discussion with Xiao Min was
>      >     about #3 and I
>      >      >      >>>>                     see that as unnecessary until we
>      >     have a draft
>      >      >      >>>>                     that explains why that is
>     needed in the
>      >      >     context
>      >      >      >>>>                     of the NVO3 architecture.
>      >      >      >>>>
>      >      >      >>>>                     Anoop
>      >      >      >>>>
>      >      >      >>>>                     On Tue, Oct 22, 2019 at 11:17 AM
>      >     Greg Mirsky
>      >      >      >>>>                          
>      >     >
>      >      >                >>
>      >      >      >>>>                   
>       
>      >     >
>      >      >          
>      >          >>>> wrote:
>      >      >      >>>>
>      >      >      >>>>                         Hi Anoop, et al.,
>      >      >      >>>>                         I agree with your
>     understanding
>      >     of what is
>      >      >      >>>>                         being defined in the current
>      >     version
>      >      >     of the
>      >      >      >>>>                         BFD over VxLAN
>     specification.
>      >     But, as I
>      >      >      >>>>                         understand, the WG is
>      >     discussing the scope
>      >      >      >>>>                         before the WGLC is closed. I
>      >     believe there
>      >      >      >>>>                         are three options:
>      >      >      >>>>
>      >      >      >>>>                          1. single BFD session
>     between
>      >     two VTEPs
>      >      >      >>>>                          2. single BFD session
>     per VNI
>      >     between
>      >      >     two VTEPs
>      >      >      >>>>                          3. multiple BFD
>     sessions per
>      >     VNI between
>      >      >      >>>>                             two VTEPs
>      >      >      >>>>
>      >      >      >>>>                         The current text
>     reflects #2. Is WG
>      >      >     accepts
>      >      >      >>>>                         this scope? If not, which
>      >     option WG would
>      >      >      >>>>                         accept?
>      >      >      >>>>
>      >      >      >>>>                         Regards,
>      >      >      >>>>                         Greg
>      >      >      >>>>
>      >      >      >>>>                         On Tue, Oct 22, 2019 at
>     2:09 PM
>      >     Anoop
>      >      >      >>>>                         Ghanwani
>     
>      >     >
>      >      >                >>
>      >      >      >>>>                       
>       
>      >     >
>      >      >          
>      >          >>>> wrote:
>      >      >      >>>>
>      >      >      >>>>                             I concur with Joel's
>     assessment
>      >      >     with the
>      >      >      >>>>                             following
>     clarifications.
>      >      >      >>>>
>      >      >      >>>>                             The current document
>     is already
>      >      >     capable
>      >      >      >>>>                             of monitoring
>     multiple VNIs
>      >      >     between VTEPs.
>      >      >      >>>>
>      >      >      >>>>                             The issue under
>     discussion
>      >     was how
>      >      >     do we
>      >      >      >>>>                             use BFD to monitor
>     multiple
>      >     VAPs that
>      >      >      >>>>                             use the same VNI
>     between a
>      >     pair of
>      >      >      >>>>                             VTEPs.  The use case for
>      >     this is not
>      >      >      >>>>                             clear to me, as from my
>      >     understanding,
>      >      >      >>>>                             we cannot have a
>     situation with
>      >      >     multiple
>      >      >      >>>>                             VAPs using the same
>      >     VNI--there is 1:1
>      >      >      >>>>                             mapping between VAP
>     and VNI.
>      >      >      >>>>
>      >      >      >>>>                             Anoop
>      >      >      >>>>
>      >      >      >>>>                             On Tue, Oct 22, 2019
>     at 6:06 AM
>      >      >     Joel M.
>      >      >      >>>>                             Halpern
>      >     
>     >
>      >      >                >>
>      >      >      >>>>                           
>       
>      >     >
>      >      >                >>>>
>      >     wrote:
>      >      >      >>>>
>      >      >      >>>>                                  From what I can
>     tell,
>      >     there
>      >      >     are two
>      >      >      >>>>                                 separate problems.
>      >      >      >>>>                                 The document we
>     have is a
>      >      >     VTEP-VTEP
>      >      >      >>>>                                 monitoring
>     document.
>      >     There is no
>      >      >      >>>>                                 need for that
>     document to
>      >      >     handle the
>      >      >      >>>>                                 multiple VNI case.
>      >      >      >>>>                                 If folks want a
>      >     protocol for doing
>      >      >      >>>>                                 BFD monitoring
>     of things
>      >      >     behind the
>      >      >      >>>>                                 VTEPs (multiple
>     VNIs),
>      >     then do
>      >      >     that
>      >      >      >>>>                                 as a separate
>      >     document.   The
>      >      >      >>>>                                 encoding will be
>     a tenant
>      >      >     encoding,
>      >      >      >>>>                                 and thus
>     sesparate from
>      >     what is
>      >      >      >>>>                                 defined in this
>     document.
>      >      >      >>>>
>      >      >      >>>>                                 Yours,
>      >      >      >>>>                                 Joel
>      >      >      >>>>
>      >      >      >>>>                                 On 10/21/2019
>     5:07 PM,
>      >     Jeffrey
>      >      >     Haas
>      >      >      >>>>                                 wrote:
>      >      >      >>>>                                 > Santosh and
>     others,
>      >      >      >>>>                                 >
>      >      >      >>>>                                 > On Thu, Oct
>     03, 2019 at
>      >      >     07:50:20PM
>      >      >      >>>>                                 +0530, Santosh P
>     K wrote:
>      >      >      >>>>                                 >>     Thanks
>     for your
>      >      >     explanation.
>      >      >      >>>>                                 This helps a lot. I
>      >     would wait
>      >      >     for more
>      >      >      >>>>                                 >> comments from
>     others
>      >     to see if
>      >      >      >>>>                                 this what we
>     need in this
>      >      >     draft to be
>      >      >      >>>>                                 >> supported
>     based on
>      >     that we can
>      >      >      >>>>                                 provide appropriate
>      >     sections
>      >      >     in the
>      >      >      >>>>                                 draft.
>      >      >      >>>>                                 >
>      >      >      >>>>                                 > The threads on the
>      >     list have
>      >      >      >>>>                                 spidered to the
>     point
>      >     where it is
>      >      >      >>>>                                 challenging
>      >      >      >>>>                                 > to follow what the
>      >     current
>      >      >     status
>      >      >      >>>>                                 of the draft is,
>     or should
>      >      >     be.  :-)
>      >      >      >>>>                                 >
>      >      >      >>>>                                 > However, if I've
>      >     followed things
>      >      >      >>>>                                 properly, the
>     question
>      >     below is
>      >      >      >>>>                                 really the
>      >      >      >>>>                                 > hinge point on
>     what our
>      >      >      >>>>                                 encapsulation
>     for BFD
>      >     over vxlan
>      >      >      >>>>                                 should look like.
>      >      >      >>>>                                 > Correct?
>      >      >      >>>>                                 >
>      >      >      >>>>                                 > Essentially,
>     do we or
>      >     do we not
>      >      >      >>>>                                 require the
>     ability to
>      >     permit
>      >      >      >>>>                                 multiple BFD
>      >      >      >>>>                                 > sessions between
>      >     distinct VAPs?
>      >      >      >>>>                                 >
>      >      >      >>>>                                 > If this is so,
>     do we
>      >     have a
>      >      >     sense
>      >      >      >>>>                                 as to how we should
>      >     proceed?
>      >      >      >>>>                                 >
>      >      >      >>>>                                 > -- Jeff
>      >      >      >>>>                                 >
>      >      >      >>>>                                 > [context preserved
>      >     below...]
>      >      >      >>>>                                 >
>      >      >      >>>>                                 >> Santosh P K
>      >      >      >>>>                                 >>
>      >      >      >>>>                                 >> On Wed, Sep
>     25, 2019
>      >     at 8:10 AM
>      >      >      >>>>                               
>       
>      >     >
>      >      >                >>
>      >      >      >>>>
>      >       
>     >
>      >      >                >>>>
>      >     wrote:
>      >      >      >>>>                                 >>
>      >      >      >>>>                                 >>> Hi Santosh,
>      >      >      >>>>                                 >>>
>      >      >      >>>>                                 >>>
>      >      >      >>>>                                 >>> With regard
>     to the
>      >     question
>      >      >      >>>>                                 whether we
>     should allow
>      >      >     multiple BFD
>      >      >      >>>>                                 sessions
>      >      >      >>>>                                 >>> for the same
>     VNI or
>      >     not,
>      >      >     IMHO we
>      >      >      >>>>                                 should allow it,
>     more
>      >      >     explanation as
>      >      >      >>>>                                 >>> follows.
>      >      >      >>>>                                 >>>
>      >      >      >>>>                                 >>> Below is a
>     figure
>      >     derived from
>      >      >      >>>>                                 figure 2 of
>     RFC8014 (An
>      >      >     Architecture for
>      >      >      >>>>                                 >>> Data-Center
>     Network
>      >      >      >>>>                                 Virtualization
>     over Layer 3
>      >      >     (NVO3)).
>      >      >      >>>>                                 >>>
>      >      >      >>>>                                 >>>             
>              |
>      >      >      >>>>                                  Data Center Network
>      >     (IP)        |
>      >      >      >>>>                                 >>>             
>              |
>      >      >      >>>>
>      >             |
>      >      >      >>>>                                 >>>
>      >      >      >>>>
>      >      >       +-----------------------------------------+
>      >      >      >>>>                                 >>>
>      >             |
>      >      >      >>>>                                                
>           |
>      >      >      >>>>                                 >>>
>      >             |
>      >      >      >>>>                                  Tunnel Overlay 
>          |
>      >      >      >>>>                                 >>>
>      >      >      >>>>                               
>       +------------+---------+
>      >      >      >>>>                               
>        +---------+------------+
>      >      >      >>>>                                 >>>              |
>      >      >      >>>>                               
>       +----------+-------+ |
>      >           |
>      >      >      >>>>                               
>       +-------+----------+ |
>      >      >      >>>>                                 >>>             
>     | |
>      >     Overlay
>      >      >      >>>>                                 Module  | |     
>       | |
>      >     Overlay
>      >      >      >>>>                                 Module  | |
>      >      >      >>>>                                 >>>              |
>      >      >      >>>>                               
>       +---------+--------+ |
>      >           |
>      >      >      >>>>                               
>       +---------+--------+ |
>      >      >      >>>>                                 >>>              |
>      >           |
>      >      >      >>>>                                     |       |   
>             |
>      >      >          |
>      >      >      >>>>                                 >>>       NVE1   |
>      >           |
>      >      >      >>>>                                     |       |   
>             |
>      >      >          |
>      >      >      >>>>                                 NVE2
>      >      >      >>>>                                 >>>              |
>      >      >      >>>>                               
>       +--------+-------+  |
>      >           |
>      >      >      >>>>                               
>       +--------+-------+  |
>      >      >      >>>>                                 >>>             
>     |  |VNI1
>      >      >     VNI2  VNI1
>      >      >      >>>>                                 |  |       |  | VNI1
>      >     VNI2 VNI1
>      >      >     |  |
>      >      >      >>>>                                 >>>              |
>      >      >      >>>>                               
>       +-+-----+----+---+  |
>      >           |
>      >      >      >>>>                               
>       +-+-----+-----+--+  |
>      >      >      >>>>                                 >>>             
>     |VAP1|
>      >     VAP2|    |
>      >      >      >>>>                                 VAP3 |     
>       |VAP1| VAP2|
>      >      >       | VAP3|
>      >      >      >>>>                                 >>>
>      >      >      >>>>                               
>       +----+-----+----+------+
>      >      >      >>>>                               
>        +----+-----+-----+-----+
>      >      >      >>>>                                 >>>
>      >       |     |
>      >      >        |
>      >      >      >>>>                                                  |
>      >       |     |
>      >      >      >>>>                                 >>>
>      >       |     |
>      >      >        |
>      >      >      >>>>                                                  |
>      >       |     |
>      >      >      >>>>                                 >>>
>      >       |     |
>      >      >        |
>      >      >      >>>>                                                  |
>      >       |     |
>      >      >      >>>>                                 >>>
>      >      >      >>>>
>      >      >     
>       -------+-----+----+-------------------+-----+-----+-------
>      >      >      >>>>                                 >>>
>      >       |     |
>      >      >        |
>      >      >      >>>>                                    Tenant        |
>      >       |     |
>      >      >      >>>>                                 >>>             
>     TSI1 |
>      >     TSI2|    |
>      >      >      >>>>                                 TSI3         
>     TSI1| TSI2|
>      >      >       |TSI3
>      >      >      >>>>                                 >>>
>      >     +---+ +---+
>      >      >      >>>>                                 +---+           
>       +---+
>      >     +---+
>      >      >       +---+
>      >      >      >>>>                                 >>>
>      >     |TS1| |TS2|
>      >      >      >>>>                                 |TS3|           
>       |TS4|
>      >     |TS5|
>      >      >       |TS6|
>      >      >      >>>>                                 >>>
>      >     +---+ +---+
>      >      >      >>>>                                 +---+           
>       +---+
>      >     +---+
>      >      >       +---+
>      >      >      >>>>                                 >>>
>      >      >      >>>>                                 >>> To my
>      >     understanding, the BFD
>      >      >      >>>>                                 sessions between
>     NVE1
>      >     and NVE2 are
>      >      >      >>>>                                 actually
>      >      >      >>>>                                 >>> initiated and
>      >     terminated
>      >      >     at VAP
>      >      >      >>>>                                 of NVE.
>      >      >      >>>>                                 >>>
>      >      >      >>>>                                 >>> If the
>     network operator
>      >      >     want to
>      >      >      >>>>                                 set up one BFD
>     session
>      >     between
>      >      >     VAP1 of
>      >      >      >>>>                                 >>> NVE1 and VAP1of
>      >     NVE2, at the
>      >      >      >>>>                                 same time
>     another BFD
>      >     session
>      >      >      >>>>                                 between VAP3 of
>      >      >      >>>>                                 >>> NVE1 and
>     VAP3 of NVE2,
>      >      >     although
>      >      >      >>>>                                 the two BFD sessions
>      >     are for
>      >      >     the same
>      >      >      >>>>                                 >>> VNI1, I
>     believe it's
>      >      >     reasonable,
>      >      >      >>>>                                 so that's why I
>     think we
>      >      >     should allow it
>      >      >      >>>>
>      >      >      >>>>
>      >      >       _______________________________________________
>      >      >      >>>>                                 nvo3 mailing list
>      >      >      >>>> nvo3@ietf.org 
>     >
>      >     
>     >>      
>      >     >
>      >      >     
>     >>>
>      >      >      >>>> https://www.ietf.org/mailman/listinfo/nvo3
>      >      >      >>>>
>      >      >
>      >
> 



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From: Anoop Ghanwani 
Date: Tue, 29 Oct 2019 08:10:21 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: "Joel M. Halpern" 
Cc: Santosh P K , Dinesh Dutt , Greg Mirsky , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Joel,

Yes, existing implementations use VNI 0 for BFD over VXLAN.  Here are a
couple of references:
https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html

https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665


I guess this document has been evolving and I have not kept up with it.
The version I had reviewed and commented on originally allowed for VNI 0.
The -04 version of the draft has this:
https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7
What version are you referring to?

Thanks,
Anoop



On Mon, Oct 28, 2019 at 12:55 PM Joel M. Halpern 
wrote:

> You are saying that there are existing implementations using VNI 0 for
> this?  Given that previous versions of the spec explicitly disallowed
> VNI 0, I am having trouble with your objecting that a spec for how to
> run over VNI 0 breask existing implementations.
>
> Note that when there is a good technical reason, the IETF does change
> Internet Drafts in ways that break early implementations.  That is the
> price of standardization.
>
> Yours,
> Joel
>
> On 10/28/2019 2:30 PM, Anoop Ghanwani wrote:
> > Hi Joel,
> >
> > Writing the spec in that way would make the current, inter-operable
> > implementation of multiple vendors non-compliant with the spec.
> >
> > Thanks,
> > Anoop
> >
> > On Mon, Oct 28, 2019 at 11:07 AM Joel M. Halpern  > > wrote:
> >
> >     I assumed this was only for the case where a tenant VNI was being
> used.
> >
> >     For the 0 VNI (which is what I prefer), always (MUST) use the
> loopback
> >     address.  There are no addresses assigned to the VTEP in that space.
> >     There is no IRB in that space.
> >
> >     Yours,
> >     Joel
> >
> >     On 10/28/2019 1:58 PM, Anoop Ghanwani wrote:
> >      > Joel,
> >      >
> >      > Are we going to qualify this by VNI?  There's a bunch of
> >     implementations
> >      > out there that don't use a tenant IP or a loopback with VNI
> 0--they
> >      > simply repeat the underlay IP in the inner IPDA.
> >      >
> >      > Thanks,
> >      > Anoop
> >      >
> >      > On Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern
> >     
> >      > >> wrote:
> >      >
> >      >     I can live with saying that you SHOULD use loopback, and MAY
> >     instead
> >      >     use
> >      >     an IP address in the customer space known to be owned by the
> VTEP
> >      >     device
> >      >     when such exists.
> >      >
> >      >     Yours,
> >      >     Joel
> >      >
> >      >     On 10/28/2019 1:32 PM, Anoop Ghanwani wrote:
> >      >      > Hi Joel,
> >      >      >
> >      >      > Perhaps we need to say use of an address owned by the
> device
> >      >     containing
> >      >      > the VTEP.
> >      >      >
> >      >      > Or are you suggesting that the use of the loopback address
> >     space
> >      >     is a MUST?
> >      >      >
> >      >      > Anoop
> >      >      >
> >      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern
> >      >     
> >     >
> >      >      > 
> >     >>> wrote:
> >      >      >
> >      >      >     There is something I am missing in your assumption
> >     about IRB.
> >      >      >
> >      >      >     As I understand VxLAN, the VTEP is under the control
> >     of the
> >      >     operator.
> >      >      >     As such, it is a pure bridge.  If you run IRB behind
> >     it, that
> >      >     is fine.
> >      >      >     Yes, an operator may offer IRB.  But as I understand
> it,
> >      >     conceptually,
> >      >      >     in terms of the VxLAN architecture the IRB is an entity
> >      >     behind the
> >      >      >     VTEP,
> >      >      >     not part of the VTEP.
> >      >      >
> >      >      >     Yours,
> >      >      >     Joel
> >      >      >
> >      >      >     On 10/28/2019 12:23 PM, Anoop Ghanwani wrote:
> >      >      >      > Santosh,
> >      >      >      >
> >      >      >      > Does it have to be a MUST?  What if I am running
> >     IRB and there
> >      >      >     are IP
> >      >      >      > addresses per VNI assigned to the VTEPs?  Why can
> the
> >      >     operator not
> >      >      >      > choose to use those?
> >      >      >      >
> >      >      >      > Anoop
> >      >      >      >
> >      >      >      > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K
> >      >      >      >  >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>
> >      >      >      >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>>> wrote:
> >      >      >      >
> >      >      >      >     Dinesh, Anoop et all,
> >      >      >      >           Lets us know if this text works for 127/8
> >      >     address range?
> >      >      >      >
> >      >      >      >     [proposed text for firewall]
> >      >      >      >
> >      >      >      >     "As per section 4 inner destination IP address
> >     MUST be
> >      >     set to
> >      >      >     127/8
> >      >      >      >     address. There may be firewall configured on
> >     VTEP to
> >      >     block 127/8
> >      >      >      >     address range if set as destination IP in inner
> IP
> >      >     header. It is
> >      >      >      >     recommended to allow 127/8 range address through
> >      >     firewall only if
> >      >      >      >     127/8 IP address is set as destination address
> >     in inner IP
> >      >      >     header."
> >      >      >      >
> >      >      >      >
> >      >      >      >     In section 4 we are talking about using 127/8
> >     and not
> >      >     really
> >      >      >     giving
> >      >      >      >     reason why. I think we should have text as RFC
> 5884
> >      >     has mentioned
> >      >      >      >     with below text.
> >      >      >      >
> >      >      >      >     [From RFC 5884]
> >      >      >      >     "The motivation for using the address range
> >     127/8 is
> >      >     the same as
> >      >      >      >     specified in Section 2.1 of [RFC4379]
> >      >      >      >     <
> https://tools.ietf.org/html/rfc4379#section-2.1>.
> >      >     This is an
> >      >      >      >     exception to the behavior defined in [RFC1122
> >      >      >      >     ]."
> >      >      >      >
> >      >      >      >
> >      >      >      >
> >      >      >      >     Thanks
> >      >      >      >     Santosh P K
> >      >      >      >
> >      >      >      >
> >      >      >      >
> >      >      >      >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt
> >      >     
> >     >
> >      >      >     
> >     >>
> >      >      >      >      >       >     >
> >      >     
> >     >>>> wrote:
> >      >      >      >
> >      >      >      >         Looks good to me Greg. I see that the text
> >     around
> >      >     the use
> >      >      >     of the
> >      >      >      >         inner IP address as also quite acceptable.
> Will
> >      >     you add any
> >      >      >      >         words about the firewall?
> >      >      >      >
> >      >      >      >         Dinesh
> >      >      >      >
> >      >      >      >         On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky
> >      >      >      >          >     
> >      >     >
> >     
> >      >      >>>
> >      >      >      >       >     >
> >      >     
> >     >>>>
> wrote:
> >      >      >      >>         Hi Dinesh, et al.,
> >      >      >      >>         please check the updated version that
> >     removed the
> >      >      >     reference to
> >      >      >      >>         Hypervisor in the text and Figure 1.
> >      >      >      >>
> >      >      >      >>         Regards,
> >      >      >      >>         Greg
> >      >      >      >>
> >      >      >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P
> K
> >      >      >      >>          >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>
> >      >      >      >>          >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>>> wrote:
> >      >      >      >>
> >      >      >      >>             Dinesh,
> >      >      >      >>                  Please see my inline comments
> [SPK]
> >      >      >      >>
> >      >      >      >>
> >      >      >      >>                 - In section 3, there's a sentence
> >     that
> >      >     is: "BFD
> >      >      >      >>                 packets intended for a Hypervisor
> >     VTEP MUST
> >      >      >     NOT..". I
> >      >      >      >>                 recommend getting rid of the word
> >      >     "Hypervisor" ashe
> >      >      >      >>                 logic applies to any VTEP.
> >      >      >      >>
> >      >      >      >>             [SPK] Thanks for comments. We will
> >     change this.
> >      >      >      >>
> >      >      >      >>                 - You already explained the
> >     precedence of
> >      >     the use of
> >      >      >      >>                 127/8 address in the inner header
> in
> >      >     MPLS. I have no
> >      >      >      >>                 specific comments in that area. I
> have
> >      >     only two
> >      >      >      >>                 questions:
> >      >      >      >>                    - Has anybody verified that the
> >     use of
> >      >     127/8
> >      >      >      >>                 address (and the right MAC) works
> with
> >      >     existing
> >      >      >      >>                 implementations, including the
> silicon
> >      >     ones? If this
> >      >      >      >>                 doesn't work there, is it worth
> >     adding the
> >      >      >     possibilit
> >      >      >      >>                 y of another address, one that is
> >     owned
> >      >     by the
> >      >      >     VTEP node?
> >      >      >      >>
> >      >      >      >>                    - Do we know if Firewalls stop
> >     such VXLAN
> >      >      >     packets?
> >      >      >      >>                 I ask this because VXLAN has an IP
> >     header
> >      >     and I
> >      >      >     don't
> >      >      >      >>                 know if firewalls stop packets
> >     with 127/8
> >      >     in the
> >      >      >     inner
> >      >      >      >>                 header. If not, is it worth adding
> a
> >      >     sentence to say
> >      >      >      >>                 that firewalls  allow such
> >     packets? The
> >      >     use of a
> >      >      >      >>                 non-127/8 address may alleviate
> >     this case
> >      >     as well.
> >      >      >      >>
> >      >      >      >>             [SPK] I think we may need to add the
> text
> >      >     about firewall
> >      >      >      >>             as some checks in firewall will be
> >     there if
> >      >     they are not
> >      >      >      >>             already using MPLS OAM which has inner
> IP
> >      >     header with
> >      >      >      >>             127/8 address range.
> >      >      >      >>
> >      >      >      >>
> >      >      >      >>                 The rest of the draft looks good
> >     to me,
> >      >      >      >>
> >      >      >      >>                 Dinesh
> >      >      >      >>
> >      >      >      >>                 On Wed, Oct 23, 2019 at 7:58 AM,
> >     Greg Mirsky
> >      >      >      >>                  >     
> >      >     >
> >      >      >      >       >     >>
> >      >     
> >     >
> >      >      >      >       >     >>>>
> >      >      >      >>                 wrote:
> >      >      >      >>>                 Hi Dinesh,
> >      >      >      >>>                 I greatly appreciate your
> comments.
> >      >     Please heave a
> >      >      >      >>>                 look at the attached copy of the
> >     working
> >      >      >     version and
> >      >      >      >>>                 its diff to -07 (latest in the
> >     datatracker).
> >      >      >      >>>
> >      >      >      >>>                 Regards,
> >      >      >      >>>                 Greg
> >      >      >      >>>
> >      >      >      >>>                 On Tue, Oct 22, 2019 at 9:52 PM
> >     Dinesh Dutt
> >      >      >      >>>                  >     
> >      >     >
> >     
> >      >     >>
> >      >      >     
> >     >
> >      >     
> >     >>>> wrote:
> >      >      >      >>>
> >      >      >      >>>                     I have the same feeling as
> Anoop.
> >      >     Greg, can you
> >      >      >      >>>                     please point me to the latest
> >     draft
> >      >     so that
> >      >      >     I can
> >      >      >      >>>                     quickly glance through it to
> be
> >      >     doubly sure,
> >      >      >      >>>
> >      >      >      >>>                     Dinesh
> >      >      >      >>>
> >      >      >      >>>                     On Wed, Oct 23, 2019 at 4:35
> AM,
> >      >     Anoop Ghanwani
> >      >      >      >>>                      >     
> >      >     >
> >      >      >      >       >     >>
> >      >      >      >>>                      >     
> >      >     >
> >      >      >      >     
> >      >      >     >>>> wrote:
> >      >      >      >>>>                     Greg,
> >      >      >      >>>>
> >      >      >      >>>>                     I think the draft is fine as
> is.
> >      >      >      >>>>
> >      >      >      >>>>                     I discussion with Xiao Min
> was
> >      >     about #3 and I
> >      >      >      >>>>                     see that as unnecessary
> until we
> >      >     have a draft
> >      >      >      >>>>                     that explains why that is
> >     needed in the
> >      >      >     context
> >      >      >      >>>>                     of the NVO3 architecture.
> >      >      >      >>>>
> >      >      >      >>>>                     Anoop
> >      >      >      >>>>
> >      >      >      >>>>                     On Tue, Oct 22, 2019 at
> 11:17 AM
> >      >     Greg Mirsky
> >      >      >      >>>>                      >     
> >      >     >
> >      >      >      >       >     >>
> >      >      >      >>>>
> >       
> >      >     >
> >      >      >      >     
> >      >      >     >>>> wrote:
> >      >      >      >>>>
> >      >      >      >>>>                         Hi Anoop, et al.,
> >      >      >      >>>>                         I agree with your
> >     understanding
> >      >     of what is
> >      >      >      >>>>                         being defined in the
> current
> >      >     version
> >      >      >     of the
> >      >      >      >>>>                         BFD over VxLAN
> >     specification.
> >      >     But, as I
> >      >      >      >>>>                         understand, the WG is
> >      >     discussing the scope
> >      >      >      >>>>                         before the WGLC is
> closed. I
> >      >     believe there
> >      >      >      >>>>                         are three options:
> >      >      >      >>>>
> >      >      >      >>>>                          1. single BFD session
> >     between
> >      >     two VTEPs
> >      >      >      >>>>                          2. single BFD session
> >     per VNI
> >      >     between
> >      >      >     two VTEPs
> >      >      >      >>>>                          3. multiple BFD
> >     sessions per
> >      >     VNI between
> >      >      >      >>>>                             two VTEPs
> >      >      >      >>>>
> >      >      >      >>>>                         The current text
> >     reflects #2. Is WG
> >      >      >     accepts
> >      >      >      >>>>                         this scope? If not, which
> >      >     option WG would
> >      >      >      >>>>                         accept?
> >      >      >      >>>>
> >      >      >      >>>>                         Regards,
> >      >      >      >>>>                         Greg
> >      >      >      >>>>
> >      >      >      >>>>                         On Tue, Oct 22, 2019 at
> >     2:09 PM
> >      >     Anoop
> >      >      >      >>>>                         Ghanwani
> >     
> >      >     >
> >      >      >      >       >     >>
> >      >      >      >>>>
> >       
> >      >     >
> >      >      >      >     
> >      >      >     >>>> wrote:
> >      >      >      >>>>
> >      >      >      >>>>                             I concur with Joel's
> >     assessment
> >      >      >     with the
> >      >      >      >>>>                             following
> >     clarifications.
> >      >      >      >>>>
> >      >      >      >>>>                             The current document
> >     is already
> >      >      >     capable
> >      >      >      >>>>                             of monitoring
> >     multiple VNIs
> >      >      >     between VTEPs.
> >      >      >      >>>>
> >      >      >      >>>>                             The issue under
> >     discussion
> >      >     was how
> >      >      >     do we
> >      >      >      >>>>                             use BFD to monitor
> >     multiple
> >      >     VAPs that
> >      >      >      >>>>                             use the same VNI
> >     between a
> >      >     pair of
> >      >      >      >>>>                             VTEPs.  The use case
> for
> >      >     this is not
> >      >      >      >>>>                             clear to me, as from
> my
> >      >     understanding,
> >      >      >      >>>>                             we cannot have a
> >     situation with
> >      >      >     multiple
> >      >      >      >>>>                             VAPs using the same
> >      >     VNI--there is 1:1
> >      >      >      >>>>                             mapping between VAP
> >     and VNI.
> >      >      >      >>>>
> >      >      >      >>>>                             Anoop
> >      >      >      >>>>
> >      >      >      >>>>                             On Tue, Oct 22, 2019
> >     at 6:06 AM
> >      >      >     Joel M.
> >      >      >      >>>>                             Halpern
> >      >     
> >     >
> >      >      >      >       >     >>
> >      >      >      >>>>
> >       
> >      >     >
> >      >      >      >       >     >>>>
> >      >     wrote:
> >      >      >      >>>>
> >      >      >      >>>>                                  From what I can
> >     tell,
> >      >     there
> >      >      >     are two
> >      >      >      >>>>                                 separate
> problems.
> >      >      >      >>>>                                 The document we
> >     have is a
> >      >      >     VTEP-VTEP
> >      >      >      >>>>                                 monitoring
> >     document.
> >      >     There is no
> >      >      >      >>>>                                 need for that
> >     document to
> >      >      >     handle the
> >      >      >      >>>>                                 multiple VNI
> case.
> >      >      >      >>>>                                 If folks want a
> >      >     protocol for doing
> >      >      >      >>>>                                 BFD monitoring
> >     of things
> >      >      >     behind the
> >      >      >      >>>>                                 VTEPs (multiple
> >     VNIs),
> >      >     then do
> >      >      >     that
> >      >      >      >>>>                                 as a separate
> >      >     document.   The
> >      >      >      >>>>                                 encoding will be
> >     a tenant
> >      >      >     encoding,
> >      >      >      >>>>                                 and thus
> >     sesparate from
> >      >     what is
> >      >      >      >>>>                                 defined in this
> >     document.
> >      >      >      >>>>
> >      >      >      >>>>                                 Yours,
> >      >      >      >>>>                                 Joel
> >      >      >      >>>>
> >      >      >      >>>>                                 On 10/21/2019
> >     5:07 PM,
> >      >     Jeffrey
> >      >      >     Haas
> >      >      >      >>>>                                 wrote:
> >      >      >      >>>>                                 > Santosh and
> >     others,
> >      >      >      >>>>                                 >
> >      >      >      >>>>                                 > On Thu, Oct
> >     03, 2019 at
> >      >      >     07:50:20PM
> >      >      >      >>>>                                 +0530, Santosh P
> >     K wrote:
> >      >      >      >>>>                                 >>     Thanks
> >     for your
> >      >      >     explanation.
> >      >      >      >>>>                                 This helps a
> lot. I
> >      >     would wait
> >      >      >     for more
> >      >      >      >>>>                                 >> comments from
> >     others
> >      >     to see if
> >      >      >      >>>>                                 this what we
> >     need in this
> >      >      >     draft to be
> >      >      >      >>>>                                 >> supported
> >     based on
> >      >     that we can
> >      >      >      >>>>                                 provide
> appropriate
> >      >     sections
> >      >      >     in the
> >      >      >      >>>>                                 draft.
> >      >      >      >>>>                                 >
> >      >      >      >>>>                                 > The threads on
> the
> >      >     list have
> >      >      >      >>>>                                 spidered to the
> >     point
> >      >     where it is
> >      >      >      >>>>                                 challenging
> >      >      >      >>>>                                 > to follow what
> the
> >      >     current
> >      >      >     status
> >      >      >      >>>>                                 of the draft is,
> >     or should
> >      >      >     be.  :-)
> >      >      >      >>>>                                 >
> >      >      >      >>>>                                 > However, if
> I've
> >      >     followed things
> >      >      >      >>>>                                 properly, the
> >     question
> >      >     below is
> >      >      >      >>>>                                 really the
> >      >      >      >>>>                                 > hinge point on
> >     what our
> >      >      >      >>>>                                 encapsulation
> >     for BFD
> >      >     over vxlan
> >      >      >      >>>>                                 should look like.
> >      >      >      >>>>                                 > Correct?
> >      >      >      >>>>                                 >
> >      >      >      >>>>                                 > Essentially,
> >     do we or
> >      >     do we not
> >      >      >      >>>>                                 require the
> >     ability to
> >      >     permit
> >      >      >      >>>>                                 multiple BFD
> >      >      >      >>>>                                 > sessions
> between
> >      >     distinct VAPs?
> >      >      >      >>>>                                 >
> >      >      >      >>>>                                 > If this is so,
> >     do we
> >      >     have a
> >      >      >     sense
> >      >      >      >>>>                                 as to how we
> should
> >      >     proceed?
> >      >      >      >>>>                                 >
> >      >      >      >>>>                                 > -- Jeff
> >      >      >      >>>>                                 >
> >      >      >      >>>>                                 > [context
> preserved
> >      >     below...]
> >      >      >      >>>>                                 >
> >      >      >      >>>>                                 >> Santosh P K
> >      >      >      >>>>                                 >>
> >      >      >      >>>>                                 >> On Wed, Sep
> >     25, 2019
> >      >     at 8:10 AM
> >      >      >      >>>>
> >       
> >      >     >
> >      >      >      >       >     >>
> >      >      >      >>>>
> >      >       
> >     >
> >      >      >      >       >     >>>>
> >      >     wrote:
> >      >      >      >>>>                                 >>
> >      >      >      >>>>                                 >>> Hi Santosh,
> >      >      >      >>>>                                 >>>
> >      >      >      >>>>                                 >>>
> >      >      >      >>>>                                 >>> With regard
> >     to the
> >      >     question
> >      >      >      >>>>                                 whether we
> >     should allow
> >      >      >     multiple BFD
> >      >      >      >>>>                                 sessions
> >      >      >      >>>>                                 >>> for the same
> >     VNI or
> >      >     not,
> >      >      >     IMHO we
> >      >      >      >>>>                                 should allow it,
> >     more
> >      >      >     explanation as
> >      >      >      >>>>                                 >>> follows.
> >      >      >      >>>>                                 >>>
> >      >      >      >>>>                                 >>> Below is a
> >     figure
> >      >     derived from
> >      >      >      >>>>                                 figure 2 of
> >     RFC8014 (An
> >      >      >     Architecture for
> >      >      >      >>>>                                 >>> Data-Center
> >     Network
> >      >      >      >>>>                                 Virtualization
> >     over Layer 3
> >      >      >     (NVO3)).
> >      >      >      >>>>                                 >>>
> >      >      >      >>>>                                 >>>
> >              |
> >      >      >      >>>>                                  Data Center
> Network
> >      >     (IP)        |
> >      >      >      >>>>                                 >>>
> >              |
> >      >      >      >>>>
> >      >             |
> >      >      >      >>>>                                 >>>
> >      >      >      >>>>
> >      >      >       +-----------------------------------------+
> >      >      >      >>>>                                 >>>
> >      >             |
> >      >      >      >>>>
> >           |
> >      >      >      >>>>                                 >>>
> >      >             |
> >      >      >      >>>>                                  Tunnel Overlay
> >          |
> >      >      >      >>>>                                 >>>
> >      >      >      >>>>
> >       +------------+---------+
> >      >      >      >>>>
> >        +---------+------------+
> >      >      >      >>>>                                 >>>
> |
> >      >      >      >>>>
> >       +----------+-------+ |
> >      >           |
> >      >      >      >>>>
> >       +-------+----------+ |
> >      >      >      >>>>                                 >>>
> >     | |
> >      >     Overlay
> >      >      >      >>>>                                 Module  | |
> >       | |
> >      >     Overlay
> >      >      >      >>>>                                 Module  | |
> >      >      >      >>>>                                 >>>
> |
> >      >      >      >>>>
> >       +---------+--------+ |
> >      >           |
> >      >      >      >>>>
> >       +---------+--------+ |
> >      >      >      >>>>                                 >>>
> |
> >      >           |
> >      >      >      >>>>                                     |       |
> >             |
> >      >      >          |
> >      >      >      >>>>                                 >>>       NVE1
>  |
> >      >           |
> >      >      >      >>>>                                     |       |
> >             |
> >      >      >          |
> >      >      >      >>>>                                 NVE2
> >      >      >      >>>>                                 >>>
> |
> >      >      >      >>>>
> >       +--------+-------+  |
> >      >           |
> >      >      >      >>>>
> >       +--------+-------+  |
> >      >      >      >>>>                                 >>>
> >     |  |VNI1
> >      >      >     VNI2  VNI1
> >      >      >      >>>>                                 |  |       |  |
> VNI1
> >      >     VNI2 VNI1
> >      >      >     |  |
> >      >      >      >>>>                                 >>>
> |
> >      >      >      >>>>
> >       +-+-----+----+---+  |
> >      >           |
> >      >      >      >>>>
> >       +-+-----+-----+--+  |
> >      >      >      >>>>                                 >>>
> >     |VAP1|
> >      >     VAP2|    |
> >      >      >      >>>>                                 VAP3 |
> >       |VAP1| VAP2|
> >      >      >       | VAP3|
> >      >      >      >>>>                                 >>>
> >      >      >      >>>>
> >       +----+-----+----+------+
> >      >      >      >>>>
> >        +----+-----+-----+-----+
> >      >      >      >>>>                                 >>>
> >      >       |     |
> >      >      >        |
> >      >      >      >>>>
>  |
> >      >       |     |
> >      >      >      >>>>                                 >>>
> >      >       |     |
> >      >      >        |
> >      >      >      >>>>
>  |
> >      >       |     |
> >      >      >      >>>>                                 >>>
> >      >       |     |
> >      >      >        |
> >      >      >      >>>>
>  |
> >      >       |     |
> >      >      >      >>>>                                 >>>
> >      >      >      >>>>
> >      >      >
> >       -------+-----+----+-------------------+-----+-----+-------
> >      >      >      >>>>                                 >>>
> >      >       |     |
> >      >      >        |
> >      >      >      >>>>                                    Tenant
> |
> >      >       |     |
> >      >      >      >>>>                                 >>>
> >     TSI1 |
> >      >     TSI2|    |
> >      >      >      >>>>                                 TSI3
> >     TSI1| TSI2|
> >      >      >       |TSI3
> >      >      >      >>>>                                 >>>
> >      >     +---+ +---+
> >      >      >      >>>>                                 +---+
> >       +---+
> >      >     +---+
> >      >      >       +---+
> >      >      >      >>>>                                 >>>
> >      >     |TS1| |TS2|
> >      >      >      >>>>                                 |TS3|
> >       |TS4|
> >      >     |TS5|
> >      >      >       |TS6|
> >      >      >      >>>>                                 >>>
> >      >     +---+ +---+
> >      >      >      >>>>                                 +---+
> >       +---+
> >      >     +---+
> >      >      >       +---+
> >      >      >      >>>>                                 >>>
> >      >      >      >>>>                                 >>> To my
> >      >     understanding, the BFD
> >      >      >      >>>>                                 sessions between
> >     NVE1
> >      >     and NVE2 are
> >      >      >      >>>>                                 actually
> >      >      >      >>>>                                 >>> initiated and
> >      >     terminated
> >      >      >     at VAP
> >      >      >      >>>>                                 of NVE.
> >      >      >      >>>>                                 >>>
> >      >      >      >>>>                                 >>> If the
> >     network operator
> >      >      >     want to
> >      >      >      >>>>                                 set up one BFD
> >     session
> >      >     between
> >      >      >     VAP1 of
> >      >      >      >>>>                                 >>> NVE1 and
> VAP1of
> >      >     NVE2, at the
> >      >      >      >>>>                                 same time
> >     another BFD
> >      >     session
> >      >      >      >>>>                                 between VAP3 of
> >      >      >      >>>>                                 >>> NVE1 and
> >     VAP3 of NVE2,
> >      >      >     although
> >      >      >      >>>>                                 the two BFD
> sessions
> >      >     are for
> >      >      >     the same
> >      >      >      >>>>                                 >>> VNI1, I
> >     believe it's
> >      >      >     reasonable,
> >      >      >      >>>>                                 so that's why I
> >     think we
> >      >      >     should allow it
> >      >      >      >>>>
> >      >      >      >>>>
> >      >      >       _______________________________________________
> >      >      >      >>>>                                 nvo3 mailing list
> >      >      >      >>>> nvo3@ietf.org 
> >     >
> >      >     
> >     >>  >     
> >      >     >
> >      >      >     
> >     >>>
> >      >      >      >>>> https://www.ietf.org/mailman/listinfo/nvo3
> >      >      >      >>>>
> >      >      >
> >      >
> >
>
>

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--00000000000088994705960e04f7--


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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani 
Cc: Santosh P K , Dinesh Dutt , Greg Mirsky , Jeffrey Haas , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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From: "Joel M. Halpern" 
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In all the discussion about what VNI to use and multiple VNI support, I 
lsot track.  Sorry.

Still, the earlier documents did not specify the IP to use.  That does 
NOT mean that we are required in later revisions of the document to 
allow anything the client wants.

Having said that, we could add text saying that since the IP address in 
the BFD request in VNI 0 is effectively meaningless, it can be set to 
any value on transmission and must be ignored on reception.
As far as I can tell, it is definitional that the VtEP does not have any 
assigned IP address for VNI 0, so we can't expect that address.

Yours,
Joel

On 10/29/2019 11:10 AM, Anoop Ghanwani wrote:
> Hi Joel,
> 
> Yes, existing implementations use VNI 0 for BFD over VXLAN.  Here are a 
> couple of references:
> https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html 
> 
> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665 
> 
> 
> I guess this document has been evolving and I have not kept up with it.  
> The version I had reviewed and commented on originally allowed for VNI 
> 0.  The -04 version of the draft has this:
> https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7
> What version are you referring to?
> 
> Thanks,
> Anoop
> 
> 
> 
> On Mon, Oct 28, 2019 at 12:55 PM Joel M. Halpern  > wrote:
> 
>     You are saying that there are existing implementations using VNI 0 for
>     this?  Given that previous versions of the spec explicitly disallowed
>     VNI 0, I am having trouble with your objecting that a spec for how to
>     run over VNI 0 breask existing implementations.
> 
>     Note that when there is a good technical reason, the IETF does change
>     Internet Drafts in ways that break early implementations.  That is the
>     price of standardization.
> 
>     Yours,
>     Joel
> 
>     On 10/28/2019 2:30 PM, Anoop Ghanwani wrote:
>      > Hi Joel,
>      >
>      > Writing the spec in that way would make the current, inter-operable
>      > implementation of multiple vendors non-compliant with the spec.
>      >
>      > Thanks,
>      > Anoop
>      >
>      > On Mon, Oct 28, 2019 at 11:07 AM Joel M. Halpern
>     
>      > >> wrote:
>      >
>      >     I assumed this was only for the case where a tenant VNI was
>     being used.
>      >
>      >     For the 0 VNI (which is what I prefer), always (MUST) use the
>     loopback
>      >     address.  There are no addresses assigned to the VTEP in that
>     space.
>      >     There is no IRB in that space.
>      >
>      >     Yours,
>      >     Joel
>      >
>      >     On 10/28/2019 1:58 PM, Anoop Ghanwani wrote:
>      >      > Joel,
>      >      >
>      >      > Are we going to qualify this by VNI?  There's a bunch of
>      >     implementations
>      >      > out there that don't use a tenant IP or a loopback with
>     VNI 0--they
>      >      > simply repeat the underlay IP in the inner IPDA.
>      >      >
>      >      > Thanks,
>      >      > Anoop
>      >      >
>      >      > On Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern
>      >     
>     >
>      >      > 
>     >>> wrote:
>      >      >
>      >      >     I can live with saying that you SHOULD use loopback,
>     and MAY
>      >     instead
>      >      >     use
>      >      >     an IP address in the customer space known to be owned
>     by the VTEP
>      >      >     device
>      >      >     when such exists.
>      >      >
>      >      >     Yours,
>      >      >     Joel
>      >      >
>      >      >     On 10/28/2019 1:32 PM, Anoop Ghanwani wrote:
>      >      >      > Hi Joel,
>      >      >      >
>      >      >      > Perhaps we need to say use of an address owned by
>     the device
>      >      >     containing
>      >      >      > the VTEP.
>      >      >      >
>      >      >      > Or are you suggesting that the use of the loopback
>     address
>      >     space
>      >      >     is a MUST?
>      >      >      >
>      >      >      > Anoop
>      >      >      >
>      >      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern
>      >      >     
>     >
>      >     
>     >>
>      >      >      >            >
>      >     
>     >>>> wrote:
>      >      >      >
>      >      >      >     There is something I am missing in your assumption
>      >     about IRB.
>      >      >      >
>      >      >      >     As I understand VxLAN, the VTEP is under the
>     control
>      >     of the
>      >      >     operator.
>      >      >      >     As such, it is a pure bridge.  If you run IRB
>     behind
>      >     it, that
>      >      >     is fine.
>      >      >      >     Yes, an operator may offer IRB.  But as I
>     understand it,
>      >      >     conceptually,
>      >      >      >     in terms of the VxLAN architecture the IRB is
>     an entity
>      >      >     behind the
>      >      >      >     VTEP,
>      >      >      >     not part of the VTEP.
>      >      >      >
>      >      >      >     Yours,
>      >      >      >     Joel
>      >      >      >
>      >      >      >     On 10/28/2019 12:23 PM, Anoop Ghanwani wrote:
>      >      >      >      > Santosh,
>      >      >      >      >
>      >      >      >      > Does it have to be a MUST?  What if I am running
>      >     IRB and there
>      >      >      >     are IP
>      >      >      >      > addresses per VNI assigned to the VTEPs? 
>     Why can the
>      >      >     operator not
>      >      >      >      > choose to use those?
>      >      >      >      >
>      >      >      >      > Anoop
>      >      >      >      >
>      >      >      >      > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K
>      >      >      >      >      
>      >          >
>      >      >          
>      >          >>
>      >      >      >          
>      >          >
>      >      >          
>      >          >>>
>      >      >      >          
>      >          >
>      >      >          
>      >          >>
>      >      >      >          
>      >          >
>      >      >          
>      >          >>>>> wrote:
>      >      >      >      >
>      >      >      >      >     Dinesh, Anoop et all,
>      >      >      >      >           Lets us know if this text works
>     for 127/8
>      >      >     address range?
>      >      >      >      >
>      >      >      >      >     [proposed text for firewall]
>      >      >      >      >
>      >      >      >      >     "As per section 4 inner destination IP
>     address
>      >     MUST be
>      >      >     set to
>      >      >      >     127/8
>      >      >      >      >     address. There may be firewall configured on
>      >     VTEP to
>      >      >     block 127/8
>      >      >      >      >     address range if set as destination IP
>     in inner IP
>      >      >     header. It is
>      >      >      >      >     recommended to allow 127/8 range address
>     through
>      >      >     firewall only if
>      >      >      >      >     127/8 IP address is set as destination
>     address
>      >     in inner IP
>      >      >      >     header."
>      >      >      >      >
>      >      >      >      >
>      >      >      >      >     In section 4 we are talking about using
>     127/8
>      >     and not
>      >      >     really
>      >      >      >     giving
>      >      >      >      >     reason why. I think we should have text
>     as RFC 5884
>      >      >     has mentioned
>      >      >      >      >     with below text.
>      >      >      >      >
>      >      >      >      >     [From RFC 5884]
>      >      >      >      >     "The motivation for using the address range
>      >     127/8 is
>      >      >     the same as
>      >      >      >      >     specified in Section 2.1 of [RFC4379]
>      >      >      >      >   
>       .
>      >      >     This is an
>      >      >      >      >     exception to the behavior defined in
>     [RFC1122
>      >      >      >      >     ]."
>      >      >      >      >
>      >      >      >      >
>      >      >      >      >
>      >      >      >      >     Thanks
>      >      >      >      >     Santosh P K
>      >      >      >      >
>      >      >      >      >
>      >      >      >      >
>      >      >      >      >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt
>      >      >     
>     >
>      >     
>     >>
>      >      >      >                >
>      >     
>     >>>
>      >      >      >      >          
>      >     >
>     
>      >     >>
>      >      >     
>     >
>      >     
>     >>>>> wrote:
>      >      >      >      >
>      >      >      >      >         Looks good to me Greg. I see that
>     the text
>      >     around
>      >      >     the use
>      >      >      >     of the
>      >      >      >      >         inner IP address as also quite
>     acceptable. Will
>      >      >     you add any
>      >      >      >      >         words about the firewall?
>      >      >      >      >
>      >      >      >      >         Dinesh
>      >      >      >      >
>      >      >      >      >         On Wed, Oct 23, 2019 at 8:36 PM,
>     Greg Mirsky
>      >      >      >      >              
>      >     >
>      >      >                >>
>      >     
>     >
>      >      >                >>>
>      >      >      >          
>      >     >
>     
>      >     >>
>      >      >                >
>      >     
>     >>>>> wrote:
>      >      >      >      >>         Hi Dinesh, et al.,
>      >      >      >      >>         please check the updated version that
>      >     removed the
>      >      >      >     reference to
>      >      >      >      >>         Hypervisor in the text and Figure 1.
>      >      >      >      >>
>      >      >      >      >>         Regards,
>      >      >      >      >>         Greg
>      >      >      >      >>
>      >      >      >      >>         On Wed, Oct 23, 2019 at 10:47 AM
>     Santosh P K
>      >      >      >      >>              
>      >          >
>      >      >          
>      >          >>
>      >      >      >          
>      >          >
>      >      >          
>      >          >>>
>      >      >      >      >>       
>            
>      >          >
>      >      >          
>      >          >>
>      >      >      >          
>      >          >
>      >      >          
>      >          >>>>> wrote:
>      >      >      >      >>
>      >      >      >      >>             Dinesh,
>      >      >      >      >>                  Please see my
>     inline comments [SPK]
>      >      >      >      >>
>      >      >      >      >>
>      >      >      >      >>                 - In section 3, there's a
>     sentence
>      >     that
>      >      >     is: "BFD
>      >      >      >      >>                 packets intended for a
>     Hypervisor
>      >     VTEP MUST
>      >      >      >     NOT..". I
>      >      >      >      >>                 recommend getting rid of
>     the word
>      >      >     "Hypervisor" ashe
>      >      >      >      >>                 logic applies to any VTEP.
>      >      >      >      >>
>      >      >      >      >>             [SPK] Thanks for comments. We will
>      >     change this.
>      >      >      >      >>
>      >      >      >      >>                 - You already explained the
>      >     precedence of
>      >      >     the use of
>      >      >      >      >>                 127/8 address in the inner
>     header in
>      >      >     MPLS. I have no
>      >      >      >      >>                 specific comments in that
>     area. I have
>      >      >     only two
>      >      >      >      >>                 questions:
>      >      >      >      >>                    - Has anybody verified
>     that the
>      >     use of
>      >      >     127/8
>      >      >      >      >>                 address (and the right MAC)
>     works with
>      >      >     existing
>      >      >      >      >>                 implementations, including
>     the silicon
>      >      >     ones? If this
>      >      >      >      >>                 doesn't work there, is it worth
>      >     adding the
>      >      >      >     possibilit
>      >      >      >      >>                 y of another address, one
>     that is
>      >     owned
>      >      >     by the
>      >      >      >     VTEP node?
>      >      >      >      >>
>      >      >      >      >>                    - Do we know if
>     Firewalls stop
>      >     such VXLAN
>      >      >      >     packets?
>      >      >      >      >>                 I ask this because VXLAN
>     has an IP
>      >     header
>      >      >     and I
>      >      >      >     don't
>      >      >      >      >>                 know if firewalls stop packets
>      >     with 127/8
>      >      >     in the
>      >      >      >     inner
>      >      >      >      >>                 header. If not, is it worth
>     adding a
>      >      >     sentence to say
>      >      >      >      >>                 that firewalls  allow such
>      >     packets? The
>      >      >     use of a
>      >      >      >      >>                 non-127/8 address may alleviate
>      >     this case
>      >      >     as well.
>      >      >      >      >>
>      >      >      >      >>             [SPK] I think we may need to
>     add the text
>      >      >     about firewall
>      >      >      >      >>             as some checks in firewall will be
>      >     there if
>      >      >     they are not
>      >      >      >      >>             already using MPLS OAM which
>     has inner IP
>      >      >     header with
>      >      >      >      >>             127/8 address range.
>      >      >      >      >>
>      >      >      >      >>
>      >      >      >      >>                 The rest of the draft looks
>     good
>      >     to me,
>      >      >      >      >>
>      >      >      >      >>                 Dinesh
>      >      >      >      >>
>      >      >      >      >>                 On Wed, Oct 23, 2019 at
>     7:58 AM,
>      >     Greg Mirsky
>      >      >      >      >>                      
>      >     >
>      >      >                >>
>      >      >      >          
>      >     >
>     
>      >     >>>
>      >      >                >
>      >     
>     >>
>      >      >      >          
>      >     >
>     
>      >     >>>>>
>      >      >      >      >>                 wrote:
>      >      >      >      >>>                 Hi Dinesh,
>      >      >      >      >>>                 I greatly appreciate your
>     comments.
>      >      >     Please heave a
>      >      >      >      >>>                 look at the attached copy
>     of the
>      >     working
>      >      >      >     version and
>      >      >      >      >>>                 its diff to -07 (latest in the
>      >     datatracker).
>      >      >      >      >>>
>      >      >      >      >>>                 Regards,
>      >      >      >      >>>                 Greg
>      >      >      >      >>>
>      >      >      >      >>>                 On Tue, Oct 22, 2019 at
>     9:52 PM
>      >     Dinesh Dutt
>      >      >      >      >>>                      
>      >     >
>      >      >     
>     >>
>      >     
>     >
>      >      >     
>     >>>
>      >      >      >                >
>      >     
>     >>
>      >      >     
>     >
>      >     
>     >>>>> wrote:
>      >      >      >      >>>
>      >      >      >      >>>                     I have the same
>     feeling as Anoop.
>      >      >     Greg, can you
>      >      >      >      >>>                     please point me to the
>     latest
>      >     draft
>      >      >     so that
>      >      >      >     I can
>      >      >      >      >>>                     quickly glance through
>     it to be
>      >      >     doubly sure,
>      >      >      >      >>>
>      >      >      >      >>>                     Dinesh
>      >      >      >      >>>
>      >      >      >      >>>                     On Wed, Oct 23, 2019
>     at 4:35 AM,
>      >      >     Anoop Ghanwani
>      >      >      >      >>>                          
>      >     >
>      >      >                >>
>      >      >      >          
>      >     >
>     
>      >     >>>
>      >      >      >      >>>                   
>       
>      >     >
>      >      >                >>
>      >      >      >          
>      >     >
>      >      >          
>      >          >>>>> wrote:
>      >      >      >      >>>>                     Greg,
>      >      >      >      >>>>
>      >      >      >      >>>>                     I think the draft is
>     fine as is.
>      >      >      >      >>>>
>      >      >      >      >>>>                     I discussion with
>     Xiao Min was
>      >      >     about #3 and I
>      >      >      >      >>>>                     see that as
>     unnecessary until we
>      >      >     have a draft
>      >      >      >      >>>>                     that explains why that is
>      >     needed in the
>      >      >      >     context
>      >      >      >      >>>>                     of the NVO3 architecture.
>      >      >      >      >>>>
>      >      >      >      >>>>                     Anoop
>      >      >      >      >>>>
>      >      >      >      >>>>                     On Tue, Oct 22, 2019
>     at 11:17 AM
>      >      >     Greg Mirsky
>      >      >      >      >>>>                   
>       
>      >     >
>      >      >                >>
>      >      >      >          
>      >     >
>     
>      >     >>>
>      >      >      >      >>>>
>      >                  >
>      >      >                >>
>      >      >      >          
>      >     >
>      >      >          
>      >          >>>>> wrote:
>      >      >      >      >>>>
>      >      >      >      >>>>                         Hi Anoop, et al.,
>      >      >      >      >>>>                         I agree with your
>      >     understanding
>      >      >     of what is
>      >      >      >      >>>>                         being defined in
>     the current
>      >      >     version
>      >      >      >     of the
>      >      >      >      >>>>                         BFD over VxLAN
>      >     specification.
>      >      >     But, as I
>      >      >      >      >>>>                         understand, the WG is
>      >      >     discussing the scope
>      >      >      >      >>>>                         before the WGLC
>     is closed. I
>      >      >     believe there
>      >      >      >      >>>>                         are three options:
>      >      >      >      >>>>
>      >      >      >      >>>>                          1. single BFD
>     session
>      >     between
>      >      >     two VTEPs
>      >      >      >      >>>>                          2. single BFD
>     session
>      >     per VNI
>      >      >     between
>      >      >      >     two VTEPs
>      >      >      >      >>>>                          3. multiple BFD
>      >     sessions per
>      >      >     VNI between
>      >      >      >      >>>>                             two VTEPs
>      >      >      >      >>>>
>      >      >      >      >>>>                         The current text
>      >     reflects #2. Is WG
>      >      >      >     accepts
>      >      >      >      >>>>                         this scope? If
>     not, which
>      >      >     option WG would
>      >      >      >      >>>>                         accept?
>      >      >      >      >>>>
>      >      >      >      >>>>                         Regards,
>      >      >      >      >>>>                         Greg
>      >      >      >      >>>>
>      >      >      >      >>>>                         On Tue, Oct 22,
>     2019 at
>      >     2:09 PM
>      >      >     Anoop
>      >      >      >      >>>>                         Ghanwani
>      >     
>     >
>      >      >                >>
>      >      >      >          
>      >     >
>     
>      >     >>>
>      >      >      >      >>>>
>      >                  >
>      >      >                >>
>      >      >      >          
>      >     >
>      >      >          
>      >          >>>>> wrote:
>      >      >      >      >>>>
>      >      >      >      >>>>                             I concur with
>     Joel's
>      >     assessment
>      >      >      >     with the
>      >      >      >      >>>>                             following
>      >     clarifications.
>      >      >      >      >>>>
>      >      >      >      >>>>                             The current
>     document
>      >     is already
>      >      >      >     capable
>      >      >      >      >>>>                             of monitoring
>      >     multiple VNIs
>      >      >      >     between VTEPs.
>      >      >      >      >>>>
>      >      >      >      >>>>                             The issue under
>      >     discussion
>      >      >     was how
>      >      >      >     do we
>      >      >      >      >>>>                             use BFD to
>     monitor
>      >     multiple
>      >      >     VAPs that
>      >      >      >      >>>>                             use the same VNI
>      >     between a
>      >      >     pair of
>      >      >      >      >>>>                             VTEPs.  The
>     use case for
>      >      >     this is not
>      >      >      >      >>>>                             clear to me,
>     as from my
>      >      >     understanding,
>      >      >      >      >>>>                             we cannot have a
>      >     situation with
>      >      >      >     multiple
>      >      >      >      >>>>                             VAPs using
>     the same
>      >      >     VNI--there is 1:1
>      >      >      >      >>>>                             mapping
>     between VAP
>      >     and VNI.
>      >      >      >      >>>>
>      >      >      >      >>>>                             Anoop
>      >      >      >      >>>>
>      >      >      >      >>>>                             On Tue, Oct
>     22, 2019
>      >     at 6:06 AM
>      >      >      >     Joel M.
>      >      >      >      >>>>                             Halpern
>      >      >     
>     >
>      >     
>     >>
>      >      >      >          
>      >     >
>     
>      >     >>>
>      >      >      >      >>>>
>      >       
>     >
>      >      >                >>
>      >      >      >          
>      >     >
>     
>      >     >>>>>
>      >      >     wrote:
>      >      >      >      >>>>
>      >      >      >      >>>>                                  From
>     what I can
>      >     tell,
>      >      >     there
>      >      >      >     are two
>      >      >      >      >>>>                                 separate
>     problems.
>      >      >      >      >>>>                                 The
>     document we
>      >     have is a
>      >      >      >     VTEP-VTEP
>      >      >      >      >>>>                                 monitoring
>      >     document.
>      >      >     There is no
>      >      >      >      >>>>                                 need for that
>      >     document to
>      >      >      >     handle the
>      >      >      >      >>>>                                 multiple
>     VNI case.
>      >      >      >      >>>>                                 If folks
>     want a
>      >      >     protocol for doing
>      >      >      >      >>>>                                 BFD
>     monitoring
>      >     of things
>      >      >      >     behind the
>      >      >      >      >>>>                                 VTEPs
>     (multiple
>      >     VNIs),
>      >      >     then do
>      >      >      >     that
>      >      >      >      >>>>                                 as a separate
>      >      >     document.   The
>      >      >      >      >>>>                                 encoding
>     will be
>      >     a tenant
>      >      >      >     encoding,
>      >      >      >      >>>>                                 and thus
>      >     sesparate from
>      >      >     what is
>      >      >      >      >>>>                                 defined
>     in this
>      >     document.
>      >      >      >      >>>>
>      >      >      >      >>>>                                 Yours,
>      >      >      >      >>>>                                 Joel
>      >      >      >      >>>>
>      >      >      >      >>>>                                 On 10/21/2019
>      >     5:07 PM,
>      >      >     Jeffrey
>      >      >      >     Haas
>      >      >      >      >>>>                                 wrote:
>      >      >      >      >>>>                                 > Santosh and
>      >     others,
>      >      >      >      >>>>                                 >
>      >      >      >      >>>>                                 > On Thu, Oct
>      >     03, 2019 at
>      >      >      >     07:50:20PM
>      >      >      >      >>>>                                 +0530,
>     Santosh P
>      >     K wrote:
>      >      >      >      >>>>                                 >>     Thanks
>      >     for your
>      >      >      >     explanation.
>      >      >      >      >>>>                                 This
>     helps a lot. I
>      >      >     would wait
>      >      >      >     for more
>      >      >      >      >>>>                                 >>
>     comments from
>      >     others
>      >      >     to see if
>      >      >      >      >>>>                                 this what we
>      >     need in this
>      >      >      >     draft to be
>      >      >      >      >>>>                                 >> supported
>      >     based on
>      >      >     that we can
>      >      >      >      >>>>                                 provide
>     appropriate
>      >      >     sections
>      >      >      >     in the
>      >      >      >      >>>>                                 draft.
>      >      >      >      >>>>                                 >
>      >      >      >      >>>>                                 > The
>     threads on the
>      >      >     list have
>      >      >      >      >>>>                                 spidered
>     to the
>      >     point
>      >      >     where it is
>      >      >      >      >>>>                                 challenging
>      >      >      >      >>>>                                 > to
>     follow what the
>      >      >     current
>      >      >      >     status
>      >      >      >      >>>>                                 of the
>     draft is,
>      >     or should
>      >      >      >     be.  :-)
>      >      >      >      >>>>                                 >
>      >      >      >      >>>>                                 >
>     However, if I've
>      >      >     followed things
>      >      >      >      >>>>                                 properly, the
>      >     question
>      >      >     below is
>      >      >      >      >>>>                                 really the
>      >      >      >      >>>>                                 > hinge
>     point on
>      >     what our
>      >      >      >      >>>>                                 encapsulation
>      >     for BFD
>      >      >     over vxlan
>      >      >      >      >>>>                                 should
>     look like.
>      >      >      >      >>>>                                 > Correct?
>      >      >      >      >>>>                                 >
>      >      >      >      >>>>                                 >
>     Essentially,
>      >     do we or
>      >      >     do we not
>      >      >      >      >>>>                                 require the
>      >     ability to
>      >      >     permit
>      >      >      >      >>>>                                 multiple BFD
>      >      >      >      >>>>                                 >
>     sessions between
>      >      >     distinct VAPs?
>      >      >      >      >>>>                                 >
>      >      >      >      >>>>                                 > If this
>     is so,
>      >     do we
>      >      >     have a
>      >      >      >     sense
>      >      >      >      >>>>                                 as to how
>     we should
>      >      >     proceed?
>      >      >      >      >>>>                                 >
>      >      >      >      >>>>                                 > -- Jeff
>      >      >      >      >>>>                                 >
>      >      >      >      >>>>                                 >
>     [context preserved
>      >      >     below...]
>      >      >      >      >>>>                                 >
>      >      >      >      >>>>                                 >>
>     Santosh P K
>      >      >      >      >>>>                                 >>
>      >      >      >      >>>>                                 >> On
>     Wed, Sep
>      >     25, 2019
>      >      >     at 8:10 AM
>      >      >      >      >>>>
>      >       
>     >
>      >      >                >>
>      >      >      >          
>      >     >
>     
>      >     >>>
>      >      >      >      >>>>
>      >      >                  >
>      >     
>     >>
>      >      >      >          
>      >     >
>     
>      >     >>>>>
>      >      >     wrote:
>      >      >      >      >>>>                                 >>
>      >      >      >      >>>>                                 >>> Hi
>     Santosh,
>      >      >      >      >>>>                                 >>>
>      >      >      >      >>>>                                 >>>
>      >      >      >      >>>>                                 >>> With
>     regard
>      >     to the
>      >      >     question
>      >      >      >      >>>>                                 whether we
>      >     should allow
>      >      >      >     multiple BFD
>      >      >      >      >>>>                                 sessions
>      >      >      >      >>>>                                 >>> for
>     the same
>      >     VNI or
>      >      >     not,
>      >      >      >     IMHO we
>      >      >      >      >>>>                                 should
>     allow it,
>      >     more
>      >      >      >     explanation as
>      >      >      >      >>>>                                 >>> follows.
>      >      >      >      >>>>                                 >>>
>      >      >      >      >>>>                                 >>> Below
>     is a
>      >     figure
>      >      >     derived from
>      >      >      >      >>>>                                 figure 2 of
>      >     RFC8014 (An
>      >      >      >     Architecture for
>      >      >      >      >>>>                                 >>>
>     Data-Center
>      >     Network
>      >      >      >      >>>>                               
>       Virtualization
>      >     over Layer 3
>      >      >      >     (NVO3)).
>      >      >      >      >>>>                                 >>>
>      >      >      >      >>>>                                 >>>
>      >              |
>      >      >      >      >>>>                                  Data
>     Center Network
>      >      >     (IP)        |
>      >      >      >      >>>>                                 >>>
>      >              |
>      >      >      >      >>>>
>      >      >             |
>      >      >      >      >>>>                                 >>>
>      >      >      >      >>>>
>      >      >      >       +-----------------------------------------+
>      >      >      >      >>>>                                 >>>
>      >      >             |
>      >      >      >      >>>>
>      >           |
>      >      >      >      >>>>                                 >>>
>      >      >             |
>      >      >      >      >>>>                                  Tunnel
>     Overlay
>      >          |
>      >      >      >      >>>>                                 >>>
>      >      >      >      >>>>
>      >       +------------+---------+
>      >      >      >      >>>>
>      >        +---------+------------+
>      >      >      >      >>>>                                 >>>     
>              |
>      >      >      >      >>>>
>      >       +----------+-------+ |
>      >      >           |
>      >      >      >      >>>>
>      >       +-------+----------+ |
>      >      >      >      >>>>                                 >>>
>      >     | |
>      >      >     Overlay
>      >      >      >      >>>>                                 Module  | |
>      >       | |
>      >      >     Overlay
>      >      >      >      >>>>                                 Module  | |
>      >      >      >      >>>>                                 >>>     
>              |
>      >      >      >      >>>>
>      >       +---------+--------+ |
>      >      >           |
>      >      >      >      >>>>
>      >       +---------+--------+ |
>      >      >      >      >>>>                                 >>>     
>              |
>      >      >           |
>      >      >      >      >>>>                                     |   
>         |
>      >             |
>      >      >      >          |
>      >      >      >      >>>>                                 >>>     
>       NVE1   |
>      >      >           |
>      >      >      >      >>>>                                     |   
>         |
>      >             |
>      >      >      >          |
>      >      >      >      >>>>                                 NVE2
>      >      >      >      >>>>                                 >>>     
>              |
>      >      >      >      >>>>
>      >       +--------+-------+  |
>      >      >           |
>      >      >      >      >>>>
>      >       +--------+-------+  |
>      >      >      >      >>>>                                 >>>
>      >     |  |VNI1
>      >      >      >     VNI2  VNI1
>      >      >      >      >>>>                                 |  |     
>       |  | VNI1
>      >      >     VNI2 VNI1
>      >      >      >     |  |
>      >      >      >      >>>>                                 >>>     
>              |
>      >      >      >      >>>>
>      >       +-+-----+----+---+  |
>      >      >           |
>      >      >      >      >>>>
>      >       +-+-----+-----+--+  |
>      >      >      >      >>>>                                 >>>
>      >     |VAP1|
>      >      >     VAP2|    |
>      >      >      >      >>>>                                 VAP3 |
>      >       |VAP1| VAP2|
>      >      >      >       | VAP3|
>      >      >      >      >>>>                                 >>>
>      >      >      >      >>>>
>      >       +----+-----+----+------+
>      >      >      >      >>>>
>      >        +----+-----+-----+-----+
>      >      >      >      >>>>                                 >>>
>      >      >       |     |
>      >      >      >        |
>      >      >      >      >>>>                                          
>             |
>      >      >       |     |
>      >      >      >      >>>>                                 >>>
>      >      >       |     |
>      >      >      >        |
>      >      >      >      >>>>                                          
>             |
>      >      >       |     |
>      >      >      >      >>>>                                 >>>
>      >      >       |     |
>      >      >      >        |
>      >      >      >      >>>>                                          
>             |
>      >      >       |     |
>      >      >      >      >>>>                                 >>>
>      >      >      >      >>>>
>      >      >      >
>      >       -------+-----+----+-------------------+-----+-----+-------
>      >      >      >      >>>>                                 >>>
>      >      >       |     |
>      >      >      >        |
>      >      >      >      >>>>                                  
>       Tenant        |
>      >      >       |     |
>      >      >      >      >>>>                                 >>>
>      >     TSI1 |
>      >      >     TSI2|    |
>      >      >      >      >>>>                                 TSI3
>      >     TSI1| TSI2|
>      >      >      >       |TSI3
>      >      >      >      >>>>                                 >>>
>      >      >     +---+ +---+
>      >      >      >      >>>>                                 +---+
>      >       +---+
>      >      >     +---+
>      >      >      >       +---+
>      >      >      >      >>>>                                 >>>
>      >      >     |TS1| |TS2|
>      >      >      >      >>>>                                 |TS3|
>      >       |TS4|
>      >      >     |TS5|
>      >      >      >       |TS6|
>      >      >      >      >>>>                                 >>>
>      >      >     +---+ +---+
>      >      >      >      >>>>                                 +---+
>      >       +---+
>      >      >     +---+
>      >      >      >       +---+
>      >      >      >      >>>>                                 >>>
>      >      >      >      >>>>                                 >>> To my
>      >      >     understanding, the BFD
>      >      >      >      >>>>                                 sessions
>     between
>      >     NVE1
>      >      >     and NVE2 are
>      >      >      >      >>>>                                 actually
>      >      >      >      >>>>                                 >>>
>     initiated and
>      >      >     terminated
>      >      >      >     at VAP
>      >      >      >      >>>>                                 of NVE.
>      >      >      >      >>>>                                 >>>
>      >      >      >      >>>>                                 >>> If the
>      >     network operator
>      >      >      >     want to
>      >      >      >      >>>>                                 set up
>     one BFD
>      >     session
>      >      >     between
>      >      >      >     VAP1 of
>      >      >      >      >>>>                                 >>> NVE1
>     and VAP1of
>      >      >     NVE2, at the
>      >      >      >      >>>>                                 same time
>      >     another BFD
>      >      >     session
>      >      >      >      >>>>                                 between
>     VAP3 of
>      >      >      >      >>>>                                 >>> NVE1 and
>      >     VAP3 of NVE2,
>      >      >      >     although
>      >      >      >      >>>>                                 the two
>     BFD sessions
>      >      >     are for
>      >      >      >     the same
>      >      >      >      >>>>                                 >>> VNI1, I
>      >     believe it's
>      >      >      >     reasonable,
>      >      >      >      >>>>                                 so that's
>     why I
>      >     think we
>      >      >      >     should allow it
>      >      >      >      >>>>
>      >      >      >      >>>>
>      >      >      >       _______________________________________________
>      >      >      >      >>>>                                 nvo3
>     mailing list
>      >      >      >      >>>> nvo3@ietf.org 
>     >
>      >     
>     >>
>      >      >     
>     >
>      >     
>     >>>
>     
>      >     >
>      >      >     
>     >>
>      >      >      >     
>     >
>      >     
>     >>>>
>      >      >      >      >>>> https://www.ietf.org/mailman/listinfo/nvo3
>      >      >      >      >>>>
>      >      >      >
>      >      >
>      >
> 


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In-Reply-To: 
From: Anoop Ghanwani 
Date: Tue, 29 Oct 2019 08:55:09 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: "Joel M. Halpern" 
Cc: Santosh P K , Dinesh Dutt , Greg Mirsky , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Joel,

>>>
Having said that, we could add text saying that since the IP address in
the BFD request in VNI 0 is effectively meaningless, it can be set to
any value on transmission and must be ignored on reception.
>>>

I think this would be better than disallowing anything other than an
address from the loopback subnet.

Thanks,
Anoop

On Tue, Oct 29, 2019 at 8:45 AM Joel M. Halpern  wrote:

> In all the discussion about what VNI to use and multiple VNI support, I
> lsot track.  Sorry.
>
> Still, the earlier documents did not specify the IP to use.  That does
> NOT mean that we are required in later revisions of the document to
> allow anything the client wants.
>
> Having said that, we could add text saying that since the IP address in
> the BFD request in VNI 0 is effectively meaningless, it can be set to
> any value on transmission and must be ignored on reception.
> As far as I can tell, it is definitional that the VtEP does not have any
> assigned IP address for VNI 0, so we can't expect that address.
>
> Yours,
> Joel
>
> On 10/29/2019 11:10 AM, Anoop Ghanwani wrote:
> > Hi Joel,
> >
> > Yes, existing implementations use VNI 0 for BFD over VXLAN.  Here are a
> > couple of references:
> >
> https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html
> >
> >
> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665
> >
> >
> > I guess this document has been evolving and I have not kept up with it.
> > The version I had reviewed and commented on originally allowed for VNI
> > 0.  The -04 version of the draft has this:
> > https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7
> > What version are you referring to?
> >
> > Thanks,
> > Anoop
> >
> >
> >
> > On Mon, Oct 28, 2019 at 12:55 PM Joel M. Halpern  > > wrote:
> >
> >     You are saying that there are existing implementations using VNI 0
> for
> >     this?  Given that previous versions of the spec explicitly disallowed
> >     VNI 0, I am having trouble with your objecting that a spec for how to
> >     run over VNI 0 breask existing implementations.
> >
> >     Note that when there is a good technical reason, the IETF does change
> >     Internet Drafts in ways that break early implementations.  That is
> the
> >     price of standardization.
> >
> >     Yours,
> >     Joel
> >
> >     On 10/28/2019 2:30 PM, Anoop Ghanwani wrote:
> >      > Hi Joel,
> >      >
> >      > Writing the spec in that way would make the current,
> inter-operable
> >      > implementation of multiple vendors non-compliant with the spec.
> >      >
> >      > Thanks,
> >      > Anoop
> >      >
> >      > On Mon, Oct 28, 2019 at 11:07 AM Joel M. Halpern
> >     
> >      > >> wrote:
> >      >
> >      >     I assumed this was only for the case where a tenant VNI was
> >     being used.
> >      >
> >      >     For the 0 VNI (which is what I prefer), always (MUST) use the
> >     loopback
> >      >     address.  There are no addresses assigned to the VTEP in that
> >     space.
> >      >     There is no IRB in that space.
> >      >
> >      >     Yours,
> >      >     Joel
> >      >
> >      >     On 10/28/2019 1:58 PM, Anoop Ghanwani wrote:
> >      >      > Joel,
> >      >      >
> >      >      > Are we going to qualify this by VNI?  There's a bunch of
> >      >     implementations
> >      >      > out there that don't use a tenant IP or a loopback with
> >     VNI 0--they
> >      >      > simply repeat the underlay IP in the inner IPDA.
> >      >      >
> >      >      > Thanks,
> >      >      > Anoop
> >      >      >
> >      >      > On Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern
> >      >     
> >     >
> >      >      > 
> >     >>> wrote:
> >      >      >
> >      >      >     I can live with saying that you SHOULD use loopback,
> >     and MAY
> >      >     instead
> >      >      >     use
> >      >      >     an IP address in the customer space known to be owned
> >     by the VTEP
> >      >      >     device
> >      >      >     when such exists.
> >      >      >
> >      >      >     Yours,
> >      >      >     Joel
> >      >      >
> >      >      >     On 10/28/2019 1:32 PM, Anoop Ghanwani wrote:
> >      >      >      > Hi Joel,
> >      >      >      >
> >      >      >      > Perhaps we need to say use of an address owned by
> >     the device
> >      >      >     containing
> >      >      >      > the VTEP.
> >      >      >      >
> >      >      >      > Or are you suggesting that the use of the loopback
> >     address
> >      >     space
> >      >      >     is a MUST?
> >      >      >      >
> >      >      >      > Anoop
> >      >      >      >
> >      >      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern
> >      >      >     
> >     >
> >      >     
> >     >>
> >      >      >      >  >       >     >
> >      >     
> >     >>>> wrote:
> >      >      >      >
> >      >      >      >     There is something I am missing in your
> assumption
> >      >     about IRB.
> >      >      >      >
> >      >      >      >     As I understand VxLAN, the VTEP is under the
> >     control
> >      >     of the
> >      >      >     operator.
> >      >      >      >     As such, it is a pure bridge.  If you run IRB
> >     behind
> >      >     it, that
> >      >      >     is fine.
> >      >      >      >     Yes, an operator may offer IRB.  But as I
> >     understand it,
> >      >      >     conceptually,
> >      >      >      >     in terms of the VxLAN architecture the IRB is
> >     an entity
> >      >      >     behind the
> >      >      >      >     VTEP,
> >      >      >      >     not part of the VTEP.
> >      >      >      >
> >      >      >      >     Yours,
> >      >      >      >     Joel
> >      >      >      >
> >      >      >      >     On 10/28/2019 12:23 PM, Anoop Ghanwani wrote:
> >      >      >      >      > Santosh,
> >      >      >      >      >
> >      >      >      >      > Does it have to be a MUST?  What if I am
> running
> >      >     IRB and there
> >      >      >      >     are IP
> >      >      >      >      > addresses per VNI assigned to the VTEPs?
> >     Why can the
> >      >      >     operator not
> >      >      >      >      > choose to use those?
> >      >      >      >      >
> >      >      >      >      > Anoop
> >      >      >      >      >
> >      >      >      >      > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K
> >      >      >      >      >  >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>
> >      >      >      >      >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>>
> >      >      >      >      >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>
> >      >      >      >      >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>>>> wrote:
> >      >      >      >      >
> >      >      >      >      >     Dinesh, Anoop et all,
> >      >      >      >      >           Lets us know if this text works
> >     for 127/8
> >      >      >     address range?
> >      >      >      >      >
> >      >      >      >      >     [proposed text for firewall]
> >      >      >      >      >
> >      >      >      >      >     "As per section 4 inner destination IP
> >     address
> >      >     MUST be
> >      >      >     set to
> >      >      >      >     127/8
> >      >      >      >      >     address. There may be firewall
> configured on
> >      >     VTEP to
> >      >      >     block 127/8
> >      >      >      >      >     address range if set as destination IP
> >     in inner IP
> >      >      >     header. It is
> >      >      >      >      >     recommended to allow 127/8 range address
> >     through
> >      >      >     firewall only if
> >      >      >      >      >     127/8 IP address is set as destination
> >     address
> >      >     in inner IP
> >      >      >      >     header."
> >      >      >      >      >
> >      >      >      >      >
> >      >      >      >      >     In section 4 we are talking about using
> >     127/8
> >      >     and not
> >      >      >     really
> >      >      >      >     giving
> >      >      >      >      >     reason why. I think we should have text
> >     as RFC 5884
> >      >      >     has mentioned
> >      >      >      >      >     with below text.
> >      >      >      >      >
> >      >      >      >      >     [From RFC 5884]
> >      >      >      >      >     "The motivation for using the address
> range
> >      >     127/8 is
> >      >      >     the same as
> >      >      >      >      >     specified in Section 2.1 of [RFC4379]
> >      >      >      >      >
> >       .
> >      >      >     This is an
> >      >      >      >      >     exception to the behavior defined in
> >     [RFC1122
> >      >      >      >      >     ]."
> >      >      >      >      >
> >      >      >      >      >
> >      >      >      >      >
> >      >      >      >      >     Thanks
> >      >      >      >      >     Santosh P K
> >      >      >      >      >
> >      >      >      >      >
> >      >      >      >      >
> >      >      >      >      >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh
> Dutt
> >      >      >     
> >     >
> >      >     
> >     >>
> >      >      >      >      >       >     >
> >      >     
> >     >>>
> >      >      >      >      >      >     
> >      >     >
> >     
> >      >     >>
> >      >      >     
> >     >
> >      >     
> >     >>>>> wrote:
> >      >      >      >      >
> >      >      >      >      >         Looks good to me Greg. I see that
> >     the text
> >      >     around
> >      >      >     the use
> >      >      >      >     of the
> >      >      >      >      >         inner IP address as also quite
> >     acceptable. Will
> >      >      >     you add any
> >      >      >      >      >         words about the firewall?
> >      >      >      >      >
> >      >      >      >      >         Dinesh
> >      >      >      >      >
> >      >      >      >      >         On Wed, Oct 23, 2019 at 8:36 PM,
> >     Greg Mirsky
> >      >      >      >      >          >     
> >      >     >
> >      >      >      >       >     >>
> >      >     
> >     >
> >      >      >      >       >     >>>
> >      >      >      >      >     
> >      >     >
> >     
> >      >      >>>
> >      >      >      >       >     >
> >      >     
> >     >>>>>
> wrote:
> >      >      >      >      >>         Hi Dinesh, et al.,
> >      >      >      >      >>         please check the updated version
> that
> >      >     removed the
> >      >      >      >     reference to
> >      >      >      >      >>         Hypervisor in the text and Figure 1.
> >      >      >      >      >>
> >      >      >      >      >>         Regards,
> >      >      >      >      >>         Greg
> >      >      >      >      >>
> >      >      >      >      >>         On Wed, Oct 23, 2019 at 10:47 AM
> >     Santosh P K
> >      >      >      >      >>          >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>
> >      >      >      >      >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>>
> >      >      >      >      >>
> >        >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>
> >      >      >      >      >     
> >      >      >     >
> >      >      >      >     
> >      >      >     >>>>> wrote:
> >      >      >      >      >>
> >      >      >      >      >>             Dinesh,
> >      >      >      >      >>                  Please see my
> >     inline comments [SPK]
> >      >      >      >      >>
> >      >      >      >      >>
> >      >      >      >      >>                 - In section 3, there's a
> >     sentence
> >      >     that
> >      >      >     is: "BFD
> >      >      >      >      >>                 packets intended for a
> >     Hypervisor
> >      >     VTEP MUST
> >      >      >      >     NOT..". I
> >      >      >      >      >>                 recommend getting rid of
> >     the word
> >      >      >     "Hypervisor" ashe
> >      >      >      >      >>                 logic applies to any VTEP.
> >      >      >      >      >>
> >      >      >      >      >>             [SPK] Thanks for comments. We
> will
> >      >     change this.
> >      >      >      >      >>
> >      >      >      >      >>                 - You already explained the
> >      >     precedence of
> >      >      >     the use of
> >      >      >      >      >>                 127/8 address in the inner
> >     header in
> >      >      >     MPLS. I have no
> >      >      >      >      >>                 specific comments in that
> >     area. I have
> >      >      >     only two
> >      >      >      >      >>                 questions:
> >      >      >      >      >>                    - Has anybody verified
> >     that the
> >      >     use of
> >      >      >     127/8
> >      >      >      >      >>                 address (and the right MAC)
> >     works with
> >      >      >     existing
> >      >      >      >      >>                 implementations, including
> >     the silicon
> >      >      >     ones? If this
> >      >      >      >      >>                 doesn't work there, is it
> worth
> >      >     adding the
> >      >      >      >     possibilit
> >      >      >      >      >>                 y of another address, one
> >     that is
> >      >     owned
> >      >      >     by the
> >      >      >      >     VTEP node?
> >      >      >      >      >>
> >      >      >      >      >>                    - Do we know if
> >     Firewalls stop
> >      >     such VXLAN
> >      >      >      >     packets?
> >      >      >      >      >>                 I ask this because VXLAN
> >     has an IP
> >      >     header
> >      >      >     and I
> >      >      >      >     don't
> >      >      >      >      >>                 know if firewalls stop
> packets
> >      >     with 127/8
> >      >      >     in the
> >      >      >      >     inner
> >      >      >      >      >>                 header. If not, is it worth
> >     adding a
> >      >      >     sentence to say
> >      >      >      >      >>                 that firewalls  allow such
> >      >     packets? The
> >      >      >     use of a
> >      >      >      >      >>                 non-127/8 address may
> alleviate
> >      >     this case
> >      >      >     as well.
> >      >      >      >      >>
> >      >      >      >      >>             [SPK] I think we may need to
> >     add the text
> >      >      >     about firewall
> >      >      >      >      >>             as some checks in firewall will
> be
> >      >     there if
> >      >      >     they are not
> >      >      >      >      >>             already using MPLS OAM which
> >     has inner IP
> >      >      >     header with
> >      >      >      >      >>             127/8 address range.
> >      >      >      >      >>
> >      >      >      >      >>
> >      >      >      >      >>                 The rest of the draft looks
> >     good
> >      >     to me,
> >      >      >      >      >>
> >      >      >      >      >>                 Dinesh
> >      >      >      >      >>
> >      >      >      >      >>                 On Wed, Oct 23, 2019 at
> >     7:58 AM,
> >      >     Greg Mirsky
> >      >      >      >      >>                  >     
> >      >     >
> >      >      >      >       >     >>
> >      >      >      >      >     
> >      >     >
> >     
> >      >      >>>>
> >      >      >      >       >     >
> >      >     
> >     >>
> >      >      >      >      >     
> >      >     >
> >     
> >      >      >>>>>>
> >      >      >      >      >>                 wrote:
> >      >      >      >      >>>                 Hi Dinesh,
> >      >      >      >      >>>                 I greatly appreciate your
> >     comments.
> >      >      >     Please heave a
> >      >      >      >      >>>                 look at the attached copy
> >     of the
> >      >     working
> >      >      >      >     version and
> >      >      >      >      >>>                 its diff to -07 (latest in
> the
> >      >     datatracker).
> >      >      >      >      >>>
> >      >      >      >      >>>                 Regards,
> >      >      >      >      >>>                 Greg
> >      >      >      >      >>>
> >      >      >      >      >>>                 On Tue, Oct 22, 2019 at
> >     9:52 PM
> >      >     Dinesh Dutt
> >      >      >      >      >>>                  >     
> >      >     >
> >      >      >     
> >     >>
> >      >     
> >     >
> >      >      >     
> >     >>>
> >      >      >      >      >       >     >
> >      >     
> >     >>
> >      >      >     
> >     >
> >      >     
> >     >>>>> wrote:
> >      >      >      >      >>>
> >      >      >      >      >>>                     I have the same
> >     feeling as Anoop.
> >      >      >     Greg, can you
> >      >      >      >      >>>                     please point me to the
> >     latest
> >      >     draft
> >      >      >     so that
> >      >      >      >     I can
> >      >      >      >      >>>                     quickly glance through
> >     it to be
> >      >      >     doubly sure,
> >      >      >      >      >>>
> >      >      >      >      >>>                     Dinesh
> >      >      >      >      >>>
> >      >      >      >      >>>                     On Wed, Oct 23, 2019
> >     at 4:35 AM,
> >      >      >     Anoop Ghanwani
> >      >      >      >      >>>                      >     
> >      >     >
> >      >      >      >       >     >>
> >      >      >      >      >     
> >      >     >
> >     
> >      >      >>>>
> >      >      >      >      >>>
> >       
> >      >     >
> >      >      >      >       >     >>
> >      >      >      >      >     
> >      >     >
> >      >      >      >     
> >      >      >     >>>>> wrote:
> >      >      >      >      >>>>                     Greg,
> >      >      >      >      >>>>
> >      >      >      >      >>>>                     I think the draft is
> >     fine as is.
> >      >      >      >      >>>>
> >      >      >      >      >>>>                     I discussion with
> >     Xiao Min was
> >      >      >     about #3 and I
> >      >      >      >      >>>>                     see that as
> >     unnecessary until we
> >      >      >     have a draft
> >      >      >      >      >>>>                     that explains why
> that is
> >      >     needed in the
> >      >      >      >     context
> >      >      >      >      >>>>                     of the NVO3
> architecture.
> >      >      >      >      >>>>
> >      >      >      >      >>>>                     Anoop
> >      >      >      >      >>>>
> >      >      >      >      >>>>                     On Tue, Oct 22, 2019
> >     at 11:17 AM
> >      >      >     Greg Mirsky
> >      >      >      >      >>>>
> >       
> >      >     >
> >      >      >      >       >     >>
> >      >      >      >      >     
> >      >     >
> >     
> >      >      >>>>
> >      >      >      >      >>>>
> >      >        >       >     >
> >      >      >      >       >     >>
> >      >      >      >      >     
> >      >     >
> >      >      >      >     
> >      >      >     >>>>> wrote:
> >      >      >      >      >>>>
> >      >      >      >      >>>>                         Hi Anoop, et al.,
> >      >      >      >      >>>>                         I agree with your
> >      >     understanding
> >      >      >     of what is
> >      >      >      >      >>>>                         being defined in
> >     the current
> >      >      >     version
> >      >      >      >     of the
> >      >      >      >      >>>>                         BFD over VxLAN
> >      >     specification.
> >      >      >     But, as I
> >      >      >      >      >>>>                         understand, the
> WG is
> >      >      >     discussing the scope
> >      >      >      >      >>>>                         before the WGLC
> >     is closed. I
> >      >      >     believe there
> >      >      >      >      >>>>                         are three options:
> >      >      >      >      >>>>
> >      >      >      >      >>>>                          1. single BFD
> >     session
> >      >     between
> >      >      >     two VTEPs
> >      >      >      >      >>>>                          2. single BFD
> >     session
> >      >     per VNI
> >      >      >     between
> >      >      >      >     two VTEPs
> >      >      >      >      >>>>                          3. multiple BFD
> >      >     sessions per
> >      >      >     VNI between
> >      >      >      >      >>>>                             two VTEPs
> >      >      >      >      >>>>
> >      >      >      >      >>>>                         The current text
> >      >     reflects #2. Is WG
> >      >      >      >     accepts
> >      >      >      >      >>>>                         this scope? If
> >     not, which
> >      >      >     option WG would
> >      >      >      >      >>>>                         accept?
> >      >      >      >      >>>>
> >      >      >      >      >>>>                         Regards,
> >      >      >      >      >>>>                         Greg
> >      >      >      >      >>>>
> >      >      >      >      >>>>                         On Tue, Oct 22,
> >     2019 at
> >      >     2:09 PM
> >      >      >     Anoop
> >      >      >      >      >>>>                         Ghanwani
> >      >     
> >     >
> >      >      >      >       >     >>
> >      >      >      >      >     
> >      >     >
> >     
> >      >      >>>>
> >      >      >      >      >>>>
> >      >        >       >     >
> >      >      >      >       >     >>
> >      >      >      >      >     
> >      >     >
> >      >      >      >     
> >      >      >     >>>>> wrote:
> >      >      >      >      >>>>
> >      >      >      >      >>>>                             I concur with
> >     Joel's
> >      >     assessment
> >      >      >      >     with the
> >      >      >      >      >>>>                             following
> >      >     clarifications.
> >      >      >      >      >>>>
> >      >      >      >      >>>>                             The current
> >     document
> >      >     is already
> >      >      >      >     capable
> >      >      >      >      >>>>                             of monitoring
> >      >     multiple VNIs
> >      >      >      >     between VTEPs.
> >      >      >      >      >>>>
> >      >      >      >      >>>>                             The issue
> under
> >      >     discussion
> >      >      >     was how
> >      >      >      >     do we
> >      >      >      >      >>>>                             use BFD to
> >     monitor
> >      >     multiple
> >      >      >     VAPs that
> >      >      >      >      >>>>                             use the same
> VNI
> >      >     between a
> >      >      >     pair of
> >      >      >      >      >>>>                             VTEPs.  The
> >     use case for
> >      >      >     this is not
> >      >      >      >      >>>>                             clear to me,
> >     as from my
> >      >      >     understanding,
> >      >      >      >      >>>>                             we cannot
> have a
> >      >     situation with
> >      >      >      >     multiple
> >      >      >      >      >>>>                             VAPs using
> >     the same
> >      >      >     VNI--there is 1:1
> >      >      >      >      >>>>                             mapping
> >     between VAP
> >      >     and VNI.
> >      >      >      >      >>>>
> >      >      >      >      >>>>                             Anoop
> >      >      >      >      >>>>
> >      >      >      >      >>>>                             On Tue, Oct
> >     22, 2019
> >      >     at 6:06 AM
> >      >      >      >     Joel M.
> >      >      >      >      >>>>                             Halpern
> >      >      >     
> >     >
> >      >     
> >     >>
> >      >      >      >      >     
> >      >     >
> >     
> >      >     >>>
> >      >      >      >      >>>>
> >      >       
> >     >
> >      >      >      >       >     >>
> >      >      >      >      >     
> >      >     >
> >     
> >      >     >>>>>
> >      >      >     wrote:
> >      >      >      >      >>>>
> >      >      >      >      >>>>                                  From
> >     what I can
> >      >     tell,
> >      >      >     there
> >      >      >      >     are two
> >      >      >      >      >>>>                                 separate
> >     problems.
> >      >      >      >      >>>>                                 The
> >     document we
> >      >     have is a
> >      >      >      >     VTEP-VTEP
> >      >      >      >      >>>>                                 monitoring
> >      >     document.
> >      >      >     There is no
> >      >      >      >      >>>>                                 need for
> that
> >      >     document to
> >      >      >      >     handle the
> >      >      >      >      >>>>                                 multiple
> >     VNI case.
> >      >      >      >      >>>>                                 If folks
> >     want a
> >      >      >     protocol for doing
> >      >      >      >      >>>>                                 BFD
> >     monitoring
> >      >     of things
> >      >      >      >     behind the
> >      >      >      >      >>>>                                 VTEPs
> >     (multiple
> >      >     VNIs),
> >      >      >     then do
> >      >      >      >     that
> >      >      >      >      >>>>                                 as a
> separate
> >      >      >     document.   The
> >      >      >      >      >>>>                                 encoding
> >     will be
> >      >     a tenant
> >      >      >      >     encoding,
> >      >      >      >      >>>>                                 and thus
> >      >     sesparate from
> >      >      >     what is
> >      >      >      >      >>>>                                 defined
> >     in this
> >      >     document.
> >      >      >      >      >>>>
> >      >      >      >      >>>>                                 Yours,
> >      >      >      >      >>>>                                 Joel
> >      >      >      >      >>>>
> >      >      >      >      >>>>                                 On
> 10/21/2019
> >      >     5:07 PM,
> >      >      >     Jeffrey
> >      >      >      >     Haas
> >      >      >      >      >>>>                                 wrote:
> >      >      >      >      >>>>                                 > Santosh
> and
> >      >     others,
> >      >      >      >      >>>>                                 >
> >      >      >      >      >>>>                                 > On Thu,
> Oct
> >      >     03, 2019 at
> >      >      >      >     07:50:20PM
> >      >      >      >      >>>>                                 +0530,
> >     Santosh P
> >      >     K wrote:
> >      >      >      >      >>>>                                 >>
>  Thanks
> >      >     for your
> >      >      >      >     explanation.
> >      >      >      >      >>>>                                 This
> >     helps a lot. I
> >      >      >     would wait
> >      >      >      >     for more
> >      >      >      >      >>>>                                 >>
> >     comments from
> >      >     others
> >      >      >     to see if
> >      >      >      >      >>>>                                 this what
> we
> >      >     need in this
> >      >      >      >     draft to be
> >      >      >      >      >>>>                                 >>
> supported
> >      >     based on
> >      >      >     that we can
> >      >      >      >      >>>>                                 provide
> >     appropriate
> >      >      >     sections
> >      >      >      >     in the
> >      >      >      >      >>>>                                 draft.
> >      >      >      >      >>>>                                 >
> >      >      >      >      >>>>                                 > The
> >     threads on the
> >      >      >     list have
> >      >      >      >      >>>>                                 spidered
> >     to the
> >      >     point
> >      >      >     where it is
> >      >      >      >      >>>>
>  challenging
> >      >      >      >      >>>>                                 > to
> >     follow what the
> >      >      >     current
> >      >      >      >     status
> >      >      >      >      >>>>                                 of the
> >     draft is,
> >      >     or should
> >      >      >      >     be.  :-)
> >      >      >      >      >>>>                                 >
> >      >      >      >      >>>>                                 >
> >     However, if I've
> >      >      >     followed things
> >      >      >      >      >>>>                                 properly,
> the
> >      >     question
> >      >      >     below is
> >      >      >      >      >>>>                                 really the
> >      >      >      >      >>>>                                 > hinge
> >     point on
> >      >     what our
> >      >      >      >      >>>>
>  encapsulation
> >      >     for BFD
> >      >      >     over vxlan
> >      >      >      >      >>>>                                 should
> >     look like.
> >      >      >      >      >>>>                                 > Correct?
> >      >      >      >      >>>>                                 >
> >      >      >      >      >>>>                                 >
> >     Essentially,
> >      >     do we or
> >      >      >     do we not
> >      >      >      >      >>>>                                 require
> the
> >      >     ability to
> >      >      >     permit
> >      >      >      >      >>>>                                 multiple
> BFD
> >      >      >      >      >>>>                                 >
> >     sessions between
> >      >      >     distinct VAPs?
> >      >      >      >      >>>>                                 >
> >      >      >      >      >>>>                                 > If this
> >     is so,
> >      >     do we
> >      >      >     have a
> >      >      >      >     sense
> >      >      >      >      >>>>                                 as to how
> >     we should
> >      >      >     proceed?
> >      >      >      >      >>>>                                 >
> >      >      >      >      >>>>                                 > -- Jeff
> >      >      >      >      >>>>                                 >
> >      >      >      >      >>>>                                 >
> >     [context preserved
> >      >      >     below...]
> >      >      >      >      >>>>                                 >
> >      >      >      >      >>>>                                 >>
> >     Santosh P K
> >      >      >      >      >>>>                                 >>
> >      >      >      >      >>>>                                 >> On
> >     Wed, Sep
> >      >     25, 2019
> >      >      >     at 8:10 AM
> >      >      >      >      >>>>
> >      >       
> >     >
> >      >      >      >       >     >>
> >      >      >      >      >     
> >      >     >
> >     
> >      >     >>>
> >      >      >      >      >>>>
> >      >      >        >       >     >
> >      >     
> >     >>
> >      >      >      >      >     
> >      >     >
> >     
> >      >      >>>>>>
> >      >      >     wrote:
> >      >      >      >      >>>>                                 >>
> >      >      >      >      >>>>                                 >>> Hi
> >     Santosh,
> >      >      >      >      >>>>                                 >>>
> >      >      >      >      >>>>                                 >>>
> >      >      >      >      >>>>                                 >>> With
> >     regard
> >      >     to the
> >      >      >     question
> >      >      >      >      >>>>                                 whether we
> >      >     should allow
> >      >      >      >     multiple BFD
> >      >      >      >      >>>>                                 sessions
> >      >      >      >      >>>>                                 >>> for
> >     the same
> >      >     VNI or
> >      >      >     not,
> >      >      >      >     IMHO we
> >      >      >      >      >>>>                                 should
> >     allow it,
> >      >     more
> >      >      >      >     explanation as
> >      >      >      >      >>>>                                 >>>
> follows.
> >      >      >      >      >>>>                                 >>>
> >      >      >      >      >>>>                                 >>> Below
> >     is a
> >      >     figure
> >      >      >     derived from
> >      >      >      >      >>>>                                 figure 2
> of
> >      >     RFC8014 (An
> >      >      >      >     Architecture for
> >      >      >      >      >>>>                                 >>>
> >     Data-Center
> >      >     Network
> >      >      >      >      >>>>
> >       Virtualization
> >      >     over Layer 3
> >      >      >      >     (NVO3)).
> >      >      >      >      >>>>                                 >>>
> >      >      >      >      >>>>                                 >>>
> >      >              |
> >      >      >      >      >>>>                                  Data
> >     Center Network
> >      >      >     (IP)        |
> >      >      >      >      >>>>                                 >>>
> >      >              |
> >      >      >      >      >>>>
> >      >      >             |
> >      >      >      >      >>>>                                 >>>
> >      >      >      >      >>>>
> >      >      >      >       +-----------------------------------------+
> >      >      >      >      >>>>                                 >>>
> >      >      >             |
> >      >      >      >      >>>>
> >      >           |
> >      >      >      >      >>>>                                 >>>
> >      >      >             |
> >      >      >      >      >>>>                                  Tunnel
> >     Overlay
> >      >          |
> >      >      >      >      >>>>                                 >>>
> >      >      >      >      >>>>
> >      >       +------------+---------+
> >      >      >      >      >>>>
> >      >        +---------+------------+
> >      >      >      >      >>>>                                 >>>
> >              |
> >      >      >      >      >>>>
> >      >       +----------+-------+ |
> >      >      >           |
> >      >      >      >      >>>>
> >      >       +-------+----------+ |
> >      >      >      >      >>>>                                 >>>
> >      >     | |
> >      >      >     Overlay
> >      >      >      >      >>>>                                 Module  |
> |
> >      >       | |
> >      >      >     Overlay
> >      >      >      >      >>>>                                 Module  |
> |
> >      >      >      >      >>>>                                 >>>
> >              |
> >      >      >      >      >>>>
> >      >       +---------+--------+ |
> >      >      >           |
> >      >      >      >      >>>>
> >      >       +---------+--------+ |
> >      >      >      >      >>>>                                 >>>
> >              |
> >      >      >           |
> >      >      >      >      >>>>                                     |
> >         |
> >      >             |
> >      >      >      >          |
> >      >      >      >      >>>>                                 >>>
> >       NVE1   |
> >      >      >           |
> >      >      >      >      >>>>                                     |
> >         |
> >      >             |
> >      >      >      >          |
> >      >      >      >      >>>>                                 NVE2
> >      >      >      >      >>>>                                 >>>
> >              |
> >      >      >      >      >>>>
> >      >       +--------+-------+  |
> >      >      >           |
> >      >      >      >      >>>>
> >      >       +--------+-------+  |
> >      >      >      >      >>>>                                 >>>
> >      >     |  |VNI1
> >      >      >      >     VNI2  VNI1
> >      >      >      >      >>>>                                 |  |
> >       |  | VNI1
> >      >      >     VNI2 VNI1
> >      >      >      >     |  |
> >      >      >      >      >>>>                                 >>>
> >              |
> >      >      >      >      >>>>
> >      >       +-+-----+----+---+  |
> >      >      >           |
> >      >      >      >      >>>>
> >      >       +-+-----+-----+--+  |
> >      >      >      >      >>>>                                 >>>
> >      >     |VAP1|
> >      >      >     VAP2|    |
> >      >      >      >      >>>>                                 VAP3 |
> >      >       |VAP1| VAP2|
> >      >      >      >       | VAP3|
> >      >      >      >      >>>>                                 >>>
> >      >      >      >      >>>>
> >      >       +----+-----+----+------+
> >      >      >      >      >>>>
> >      >        +----+-----+-----+-----+
> >      >      >      >      >>>>                                 >>>
> >      >      >       |     |
> >      >      >      >        |
> >      >      >      >      >>>>
> >             |
> >      >      >       |     |
> >      >      >      >      >>>>                                 >>>
> >      >      >       |     |
> >      >      >      >        |
> >      >      >      >      >>>>
> >             |
> >      >      >       |     |
> >      >      >      >      >>>>                                 >>>
> >      >      >       |     |
> >      >      >      >        |
> >      >      >      >      >>>>
> >             |
> >      >      >       |     |
> >      >      >      >      >>>>                                 >>>
> >      >      >      >      >>>>
> >      >      >      >
> >      >       -------+-----+----+-------------------+-----+-----+-------
> >      >      >      >      >>>>                                 >>>
> >      >      >       |     |
> >      >      >      >        |
> >      >      >      >      >>>>
> >       Tenant        |
> >      >      >       |     |
> >      >      >      >      >>>>                                 >>>
> >      >     TSI1 |
> >      >      >     TSI2|    |
> >      >      >      >      >>>>                                 TSI3
> >      >     TSI1| TSI2|
> >      >      >      >       |TSI3
> >      >      >      >      >>>>                                 >>>
> >      >      >     +---+ +---+
> >      >      >      >      >>>>                                 +---+
> >      >       +---+
> >      >      >     +---+
> >      >      >      >       +---+
> >      >      >      >      >>>>                                 >>>
> >      >      >     |TS1| |TS2|
> >      >      >      >      >>>>                                 |TS3|
> >      >       |TS4|
> >      >      >     |TS5|
> >      >      >      >       |TS6|
> >      >      >      >      >>>>                                 >>>
> >      >      >     +---+ +---+
> >      >      >      >      >>>>                                 +---+
> >      >       +---+
> >      >      >     +---+
> >      >      >      >       +---+
> >      >      >      >      >>>>                                 >>>
> >      >      >      >      >>>>                                 >>> To my
> >      >      >     understanding, the BFD
> >      >      >      >      >>>>                                 sessions
> >     between
> >      >     NVE1
> >      >      >     and NVE2 are
> >      >      >      >      >>>>                                 actually
> >      >      >      >      >>>>                                 >>>
> >     initiated and
> >      >      >     terminated
> >      >      >      >     at VAP
> >      >      >      >      >>>>                                 of NVE.
> >      >      >      >      >>>>                                 >>>
> >      >      >      >      >>>>                                 >>> If the
> >      >     network operator
> >      >      >      >     want to
> >      >      >      >      >>>>                                 set up
> >     one BFD
> >      >     session
> >      >      >     between
> >      >      >      >     VAP1 of
> >      >      >      >      >>>>                                 >>> NVE1
> >     and VAP1of
> >      >      >     NVE2, at the
> >      >      >      >      >>>>                                 same time
> >      >     another BFD
> >      >      >     session
> >      >      >      >      >>>>                                 between
> >     VAP3 of
> >      >      >      >      >>>>                                 >>> NVE1
> and
> >      >     VAP3 of NVE2,
> >      >      >      >     although
> >      >      >      >      >>>>                                 the two
> >     BFD sessions
> >      >      >     are for
> >      >      >      >     the same
> >      >      >      >      >>>>                                 >>> VNI1,
> I
> >      >     believe it's
> >      >      >      >     reasonable,
> >      >      >      >      >>>>                                 so that's
> >     why I
> >      >     think we
> >      >      >      >     should allow it
> >      >      >      >      >>>>
> >      >      >      >      >>>>
> >      >      >      >
>  _______________________________________________
> >      >      >      >      >>>>                                 nvo3
> >     mailing list
> >      >      >      >      >>>> nvo3@ietf.org 
> >     >
> >      >     
> >     >>
> >      >      >     
> >     >
> >      >     
> >     >>>
> >     
> >      >     >
> >      >      >     
> >     >>
> >      >      >      >     
> >     >
> >      >     
> >     >>>>
> >      >      >      >      >>>>
> https://www.ietf.org/mailman/listinfo/nvo3
> >      >      >      >      >>>>
> >      >      >      >
> >      >      >
> >      >
> >
>

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From nobody Tue Oct 29 13:54:12 2019
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Date: Tue, 29 Oct 2019 16:56:52 -0400
From: Jeffrey Haas 
To: Santosh P K 
Cc: Anoop Ghanwani , Dinesh Dutt , Greg Mirsky , "Joel M. Halpern" , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
Message-ID: <20191029205651.GA10145@pfrc.org>
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Santosh,

On Mon, Oct 28, 2019 at 10:24:06PM +0530, Santosh P K wrote:
> "As per section 4 inner destination IP address MAY be set to 127/8 address.
> There could be firewall configured on VTEP to block 127/8 address range if
> set as destination IP in inner IP header. It is recommended to allow 127/8
> range address through firewall only if inner IP header's destination IP is
> set to 127/8 IP address."

Would it be reasonable to suggest "SHOULD be set"?

Our motivation in this section is to offer what is likely to be a reasonable
default, without providing restriction from something more amenable to some
provider's requirement.

Similarly, based on this text, we'll get asked about "recommended" vs.
"RECOMMENDED".  What level of strength do you think we should have here?


-- Jeff


From nobody Wed Oct 30 04:22:42 2019
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Date: Wed, 30 Oct 2019 06:59:38 +0500
From: Dinesh Dutt 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: "Joel M. Halpern" 
Cc: Anoop Ghanwani , Santosh P K , Greg Mirsky , Jeffrey Haas , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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I suspect silicon implementations will have a problem with saying that 
they can be set to anything and MUST be ignored on reception. Your 
logic is sound, it's just that I fear you'll break many existing 
implementations. I recommend sticking with the 127/8 address for this 
case.

Dinesh

On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern  
wrote:
> In all the discussion about what VNI to use and multiple VNI support, 
> I lsot track.  Sorry.
> 
> Still, the earlier documents did not specify the IP to use.  That 
> does NOT mean that we are required in later revisions of the document 
> to allow anything the client wants.
> 
> Having said that, we could add text saying that since the IP address 
> in the BFD request in VNI 0 is effectively meaningless, it can be set 
> to any value on transmission and must be ignored on reception.
> As far as I can tell, it is definitional that the VtEP does not have 
> any assigned IP address for VNI 0, so we can't expect that address.
> 
> Yours,
> Joel
> 
> On 10/29/2019 11:10 AM, Anoop Ghanwani wrote:
>> Hi Joel,
>> 
>> Yes, existing implementations use VNI 0 for BFD over VXLAN.  Here 
>> are a couple of references:
>> https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html 
>> 
>> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665 
>> 
>> 
>> I guess this document has been evolving and I have not kept up with 
>> it.  The version I had reviewed and commented on originally allowed 
>> for VNI 0.  The -04 version of the draft has this:
>> https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7
>> What version are you referring to?
>> 
>> Thanks,
>> Anoop
>> 
>> 
>> 
>> On Mon, Oct 28, 2019 at 12:55 PM Joel M. Halpern 
>> > wrote:
>> 
>>     You are saying that there are existing implementations using VNI 
>> 0 for
>>     this?  Given that previous versions of the spec explicitly 
>> disallowed
>>     VNI 0, I am having trouble with your objecting that a spec for 
>> how to
>>     run over VNI 0 breask existing implementations.
>> 
>>     Note that when there is a good technical reason, the IETF does 
>> change
>>     Internet Drafts in ways that break early implementations.  That 
>> is the
>>     price of standardization.
>> 
>>     Yours,
>>     Joel
>> 
>>     On 10/28/2019 2:30 PM, Anoop Ghanwani wrote:
>>      > Hi Joel,
>>      >
>>      > Writing the spec in that way would make the current, 
>> inter-operable
>>      > implementation of multiple vendors non-compliant with the 
>> spec.
>>      >
>>      > Thanks,
>>      > Anoop
>>      >
>>      > On Mon, Oct 28, 2019 at 11:07 AM Joel M. Halpern
>>     
>>      > >> 
>> wrote:
>>      >
>>      >     I assumed this was only for the case where a tenant VNI 
>> was
>>     being used.
>>      >
>>      >     For the 0 VNI (which is what I prefer), always (MUST) use 
>> the
>>     loopback
>>      >     address.  There are no addresses assigned to the VTEP in 
>> that
>>     space.
>>      >     There is no IRB in that space.
>>      >
>>      >     Yours,
>>      >     Joel
>>      >
>>      >     On 10/28/2019 1:58 PM, Anoop Ghanwani wrote:
>>      >      > Joel,
>>      >      >
>>      >      > Are we going to qualify this by VNI?  There's a bunch 
>> of
>>      >     implementations
>>      >      > out there that don't use a tenant IP or a loopback with
>>     VNI 0--they
>>      >      > simply repeat the underlay IP in the inner IPDA.
>>      >      >
>>      >      > Thanks,
>>      >      > Anoop
>>      >      >
>>      >      > On Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern
>>      >     
>>     >
>>      >      > > 
>>     >>> 
>> wrote:
>>      >      >
>>      >      >     I can live with saying that you SHOULD use 
>> loopback,
>>     and MAY
>>      >     instead
>>      >      >     use
>>      >      >     an IP address in the customer space known to be 
>> owned
>>     by the VTEP
>>      >      >     device
>>      >      >     when such exists.
>>      >      >
>>      >      >     Yours,
>>      >      >     Joel
>>      >      >
>>      >      >     On 10/28/2019 1:32 PM, Anoop Ghanwani wrote:
>>      >      >      > Hi Joel,
>>      >      >      >
>>      >      >      > Perhaps we need to say use of an address owned 
>> by
>>     the device
>>      >      >     containing
>>      >      >      > the VTEP.
>>      >      >      >
>>      >      >      > Or are you suggesting that the use of the 
>> loopback
>>     address
>>      >     space
>>      >      >     is a MUST?
>>      >      >      >
>>      >      >      > Anoop
>>      >      >      >
>>      >      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern
>>      >      >     
>>     >
>>      >     
>>     >>
>>      >      >      > >      >     >
>>      >     
>>     >>>> 
>> wrote:
>>      >      >      >
>>      >      >      >     There is something I am missing in your 
>> assumption
>>      >     about IRB.
>>      >      >      >
>>      >      >      >     As I understand VxLAN, the VTEP is under the
>>     control
>>      >     of the
>>      >      >     operator.
>>      >      >      >     As such, it is a pure bridge.  If you run 
>> IRB
>>     behind
>>      >     it, that
>>      >      >     is fine.
>>      >      >      >     Yes, an operator may offer IRB.  But as I
>>     understand it,
>>      >      >     conceptually,
>>      >      >      >     in terms of the VxLAN architecture the IRB 
>> is
>>     an entity
>>      >      >     behind the
>>      >      >      >     VTEP,
>>      >      >      >     not part of the VTEP.
>>      >      >      >
>>      >      >      >     Yours,
>>      >      >      >     Joel
>>      >      >      >
>>      >      >      >     On 10/28/2019 12:23 PM, Anoop Ghanwani 
>> wrote:
>>      >      >      >      > Santosh,
>>      >      >      >      >
>>      >      >      >      > Does it have to be a MUST?  What if I am 
>> running
>>      >     IRB and there
>>      >      >      >     are IP
>>      >      >      >      > addresses per VNI assigned to the VTEPs? 
>>     Why can the
>>      >      >     operator not
>>      >      >      >      > choose to use those?
>>      >      >      >      >
>>      >      >      >      > Anoop
>>      >      >      >      >
>>      >      >      >      > On Mon, Oct 28, 2019 at 7:51 AM Santosh 
>> P K
>>      >      >      >      > >     
>>      >     >     >
>>      >      >     >     
>>      >     >     >>
>>      >      >      >     >     
>>      >     >     >
>>      >      >     >     
>>      >     >     >>>
>>      >      >      >     >     
>>      >     >     >
>>      >      >     >     
>>      >     >     >>
>>      >      >      >     >     
>>      >     >     >
>>      >      >     >     
>>      >     >     >>>>> wrote:
>>      >      >      >      >
>>      >      >      >      >     Dinesh, Anoop et all,
>>      >      >      >      >           Lets us know if this text works
>>     for 127/8
>>      >      >     address range?
>>      >      >      >      >
>>      >      >      >      >     [proposed text for firewall]
>>      >      >      >      >
>>      >      >      >      >     "As per section 4 inner destination 
>> IP
>>     address
>>      >     MUST be
>>      >      >     set to
>>      >      >      >     127/8
>>      >      >      >      >     address. There may be firewall 
>> configured on
>>      >     VTEP to
>>      >      >     block 127/8
>>      >      >      >      >     address range if set as destination 
>> IP
>>     in inner IP
>>      >      >     header. It is
>>      >      >      >      >     recommended to allow 127/8 range 
>> address
>>     through
>>      >      >     firewall only if
>>      >      >      >      >     127/8 IP address is set as 
>> destination
>>     address
>>      >     in inner IP
>>      >      >      >     header."
>>      >      >      >      >
>>      >      >      >      >
>>      >      >      >      >     In section 4 we are talking about 
>> using
>>     127/8
>>      >     and not
>>      >      >     really
>>      >      >      >     giving
>>      >      >      >      >     reason why. I think we should have 
>> text
>>     as RFC 5884
>>      >      >     has mentioned
>>      >      >      >      >     with below text.
>>      >      >      >      >
>>      >      >      >      >     [From RFC 5884]
>>      >      >      >      >     "The motivation for using the 
>> address range
>>      >     127/8 is
>>      >      >     the same as
>>      >      >      >      >     specified in Section 2.1 of [RFC4379]
>>      >      >      >      >         
>> .
>>      >      >     This is an
>>      >      >      >      >     exception to the behavior defined in
>>     [RFC1122
>>      >      >      >      >     
>> ]."
>>      >      >      >      >
>>      >      >      >      >
>>      >      >      >      >
>>      >      >      >      >     Thanks
>>      >      >      >      >     Santosh P K
>>      >      >      >      >
>>      >      >      >      >
>>      >      >      >      >
>>      >      >      >      >     On Thu, Oct 24, 2019 at 1:24 AM 
>> Dinesh Dutt
>>      >      >     
>>     >
>>      >     
>>     >>
>>      >      >      >     >      >     >
>>      >     
>>     >>>
>>      >      >      >      >     >     
>>      >     >
>>     
>>      >     >>
>>      >      >     
>>     >
>>      >     
>>     >>>>> wrote:
>>      >      >      >      >
>>      >      >      >      >         Looks good to me Greg. I see that
>>     the text
>>      >     around
>>      >      >     the use
>>      >      >      >     of the
>>      >      >      >      >         inner IP address as also quite
>>     acceptable. Will
>>      >      >     you add any
>>      >      >      >      >         words about the firewall?
>>      >      >      >      >
>>      >      >      >      >         Dinesh
>>      >      >      >      >
>>      >      >      >      >         On Wed, Oct 23, 2019 at 8:36 PM,
>>     Greg Mirsky
>>      >      >      >      >         >     
>>      >     > >
>>      >      >     >      >     >>
>>      >     > 
>>     >
>>      >      >     >      >     >>>
>>      >      >      >     >     
>>      >     > >
>>     
>>      >     > >>
>>      >      >     >      >     >
>>      >     > 
>>     > >>>>> wrote:
>>      >      >      >      >>         Hi Dinesh, et al.,
>>      >      >      >      >>         please check the updated 
>> version that
>>      >     removed the
>>      >      >      >     reference to
>>      >      >      >      >>         Hypervisor in the text and 
>> Figure 1.
>>      >      >      >      >>
>>      >      >      >      >>         Regards,
>>      >      >      >      >>         Greg
>>      >      >      >      >>
>>      >      >      >      >>         On Wed, Oct 23, 2019 at 10:47 AM
>>     Santosh P K
>>      >      >      >      >>         >     
>>      >     >     >
>>      >      >     >     
>>      >     >     >>
>>      >      >      >     >     
>>      >     >     >
>>      >      >     >     
>>      >     >     >>>
>>      >      >      >      >>             
>> >     
>>      >     >     >
>>      >      >     >     
>>      >     >     >>
>>      >      >      >     >     
>>      >     >     >
>>      >      >     >     
>>      >     >     >>>>> wrote:
>>      >      >      >      >>
>>      >      >      >      >>             Dinesh,
>>      >      >      >      >>                  Please see my
>>     inline comments [SPK]
>>      >      >      >      >>
>>      >      >      >      >>
>>      >      >      >      >>                 - In section 3, there's 
>> a
>>     sentence
>>      >     that
>>      >      >     is: "BFD
>>      >      >      >      >>                 packets intended for a
>>     Hypervisor
>>      >     VTEP MUST
>>      >      >      >     NOT..". I
>>      >      >      >      >>                 recommend getting rid of
>>     the word
>>      >      >     "Hypervisor" ashe
>>      >      >      >      >>                 logic applies to any 
>> VTEP.
>>      >      >      >      >>
>>      >      >      >      >>             [SPK] Thanks for comments. 
>> We will
>>      >     change this.
>>      >      >      >      >>
>>      >      >      >      >>                 - You already explained 
>> the
>>      >     precedence of
>>      >      >     the use of
>>      >      >      >      >>                 127/8 address in the 
>> inner
>>     header in
>>      >      >     MPLS. I have no
>>      >      >      >      >>                 specific comments in 
>> that
>>     area. I have
>>      >      >     only two
>>      >      >      >      >>                 questions:
>>      >      >      >      >>                    - Has anybody 
>> verified
>>     that the
>>      >     use of
>>      >      >     127/8
>>      >      >      >      >>                 address (and the right 
>> MAC)
>>     works with
>>      >      >     existing
>>      >      >      >      >>                 implementations, 
>> including
>>     the silicon
>>      >      >     ones? If this
>>      >      >      >      >>                 doesn't work there, is 
>> it worth
>>      >     adding the
>>      >      >      >     possibilit
>>      >      >      >      >>                 y of another address, 
>> one
>>     that is
>>      >     owned
>>      >      >     by the
>>      >      >      >     VTEP node?
>>      >      >      >      >>
>>      >      >      >      >>                    - Do we know if
>>     Firewalls stop
>>      >     such VXLAN
>>      >      >      >     packets?
>>      >      >      >      >>                 I ask this because VXLAN
>>     has an IP
>>      >     header
>>      >      >     and I
>>      >      >      >     don't
>>      >      >      >      >>                 know if firewalls stop 
>> packets
>>      >     with 127/8
>>      >      >     in the
>>      >      >      >     inner
>>      >      >      >      >>                 header. If not, is it 
>> worth
>>     adding a
>>      >      >     sentence to say
>>      >      >      >      >>                 that firewalls  allow 
>> such
>>      >     packets? The
>>      >      >     use of a
>>      >      >      >      >>                 non-127/8 address may 
>> alleviate
>>      >     this case
>>      >      >     as well.
>>      >      >      >      >>
>>      >      >      >      >>             [SPK] I think we may need to
>>     add the text
>>      >      >     about firewall
>>      >      >      >      >>             as some checks in firewall 
>> will be
>>      >     there if
>>      >      >     they are not
>>      >      >      >      >>             already using MPLS OAM which
>>     has inner IP
>>      >      >     header with
>>      >      >      >      >>             127/8 address range.
>>      >      >      >      >>
>>      >      >      >      >>
>>      >      >      >      >>                 The rest of the draft 
>> looks
>>     good
>>      >     to me,
>>      >      >      >      >>
>>      >      >      >      >>                 Dinesh
>>      >      >      >      >>
>>      >      >      >      >>                 On Wed, Oct 23, 2019 at
>>     7:58 AM,
>>      >     Greg Mirsky
>>      >      >      >      >>                 >     
>>      >     > >
>>      >      >     >      >     >>
>>      >      >      >     >     
>>      >     > >
>>     
>>      >     > >>>
>>      >      >     >      >     >
>>      >     > 
>>     >>
>>      >      >      >     >     
>>      >     > >
>>     
>>      >     > >>>>>
>>      >      >      >      >>                 wrote:
>>      >      >      >      >>>                 Hi Dinesh,
>>      >      >      >      >>>                 I greatly appreciate 
>> your
>>     comments.
>>      >      >     Please heave a
>>      >      >      >      >>>                 look at the attached 
>> copy
>>     of the
>>      >     working
>>      >      >      >     version and
>>      >      >      >      >>>                 its diff to -07 
>> (latest in the
>>      >     datatracker).
>>      >      >      >      >>>
>>      >      >      >      >>>                 Regards,
>>      >      >      >      >>>                 Greg
>>      >      >      >      >>>
>>      >      >      >      >>>                 On Tue, Oct 22, 2019 at
>>     9:52 PM
>>      >     Dinesh Dutt
>>      >      >      >      >>>                 >     
>>      >     >
>>      >      >     
>>     >>
>>      >     
>>     >
>>      >      >     
>>     >>>
>>      >      >      >     >      >     >
>>      >     
>>     >>
>>      >      >     
>>     >
>>      >     
>>     >>>>> wrote:
>>      >      >      >      >>>
>>      >      >      >      >>>                     I have the same
>>     feeling as Anoop.
>>      >      >     Greg, can you
>>      >      >      >      >>>                     please point me to 
>> the
>>     latest
>>      >     draft
>>      >      >     so that
>>      >      >      >     I can
>>      >      >      >      >>>                     quickly glance 
>> through
>>     it to be
>>      >      >     doubly sure,
>>      >      >      >      >>>
>>      >      >      >      >>>                     Dinesh
>>      >      >      >      >>>
>>      >      >      >      >>>                     On Wed, Oct 23, 
>> 2019
>>     at 4:35 AM,
>>      >      >     Anoop Ghanwani
>>      >      >      >      >>>                     
>> >     
>>      >     > >
>>      >      >     >      >     >>
>>      >      >      >     >     
>>      >     > >
>>     
>>      >     > >>>
>>      >      >      >      >>>                         
>> 
>>      >     > >
>>      >      >     >      >     >>
>>      >      >      >     >     
>>      >     > >
>>      >      >     >     
>>      >     >     >>>>> wrote:
>>      >      >      >      >>>>                     Greg,
>>      >      >      >      >>>>
>>      >      >      >      >>>>                     I think the draft 
>> is
>>     fine as is.
>>      >      >      >      >>>>
>>      >      >      >      >>>>                     I discussion with
>>     Xiao Min was
>>      >      >     about #3 and I
>>      >      >      >      >>>>                     see that as
>>     unnecessary until we
>>      >      >     have a draft
>>      >      >      >      >>>>                     that explains why 
>> that is
>>      >     needed in the
>>      >      >      >     context
>>      >      >      >      >>>>                     of the NVO3 
>> architecture.
>>      >      >      >      >>>>
>>      >      >      >      >>>>                     Anoop
>>      >      >      >      >>>>
>>      >      >      >      >>>>                     On Tue, Oct 22, 
>> 2019
>>     at 11:17 AM
>>      >      >     Greg Mirsky
>>      >      >      >      >>>>                         
>> 
>>      >     > >
>>      >      >     >      >     >>
>>      >      >      >     >     
>>      >     > >
>>     
>>      >     > >>>
>>      >      >      >      >>>>
>>      >       >      >     >
>>      >      >     >      >     >>
>>      >      >      >     >     
>>      >     > >
>>      >      >     >     
>>      >     >     >>>>> wrote:
>>      >      >      >      >>>>
>>      >      >      >      >>>>                         Hi Anoop, et 
>> al.,
>>      >      >      >      >>>>                         I agree with 
>> your
>>      >     understanding
>>      >      >     of what is
>>      >      >      >      >>>>                         being defined 
>> in
>>     the current
>>      >      >     version
>>      >      >      >     of the
>>      >      >      >      >>>>                         BFD over VxLAN
>>      >     specification.
>>      >      >     But, as I
>>      >      >      >      >>>>                         understand, 
>> the WG is
>>      >      >     discussing the scope
>>      >      >      >      >>>>                         before the 
>> WGLC
>>     is closed. I
>>      >      >     believe there
>>      >      >      >      >>>>                         are three 
>> options:
>>      >      >      >      >>>>
>>      >      >      >      >>>>                          1. single BFD
>>     session
>>      >     between
>>      >      >     two VTEPs
>>      >      >      >      >>>>                          2. single BFD
>>     session
>>      >     per VNI
>>      >      >     between
>>      >      >      >     two VTEPs
>>      >      >      >      >>>>                          3. multiple 
>> BFD
>>      >     sessions per
>>      >      >     VNI between
>>      >      >      >      >>>>                             two VTEPs
>>      >      >      >      >>>>
>>      >      >      >      >>>>                         The current 
>> text
>>      >     reflects #2. Is WG
>>      >      >      >     accepts
>>      >      >      >      >>>>                         this scope? If
>>     not, which
>>      >      >     option WG would
>>      >      >      >      >>>>                         accept?
>>      >      >      >      >>>>
>>      >      >      >      >>>>                         Regards,
>>      >      >      >      >>>>                         Greg
>>      >      >      >      >>>>
>>      >      >      >      >>>>                         On Tue, Oct 
>> 22,
>>     2019 at
>>      >     2:09 PM
>>      >      >     Anoop
>>      >      >      >      >>>>                         Ghanwani
>>      >     
>>     >
>>      >      >     >      >     >>
>>      >      >      >     >     
>>      >     > >
>>     
>>      >     > >>>
>>      >      >      >      >>>>
>>      >       >      >     >
>>      >      >     >      >     >>
>>      >      >      >     >     
>>      >     > >
>>      >      >     >     
>>      >     >     >>>>> wrote:
>>      >      >      >      >>>>
>>      >      >      >      >>>>                             I concur 
>> with
>>     Joel's
>>      >     assessment
>>      >      >      >     with the
>>      >      >      >      >>>>                             following
>>      >     clarifications.
>>      >      >      >      >>>>
>>      >      >      >      >>>>                             The 
>> current
>>     document
>>      >     is already
>>      >      >      >     capable
>>      >      >      >      >>>>                             of 
>> monitoring
>>      >     multiple VNIs
>>      >      >      >     between VTEPs.
>>      >      >      >      >>>>
>>      >      >      >      >>>>                             The issue 
>> under
>>      >     discussion
>>      >      >     was how
>>      >      >      >     do we
>>      >      >      >      >>>>                             use BFD to
>>     monitor
>>      >     multiple
>>      >      >     VAPs that
>>      >      >      >      >>>>                             use the 
>> same VNI
>>      >     between a
>>      >      >     pair of
>>      >      >      >      >>>>                             VTEPs.  
>> The
>>     use case for
>>      >      >     this is not
>>      >      >      >      >>>>                             clear to 
>> me,
>>     as from my
>>      >      >     understanding,
>>      >      >      >      >>>>                             we cannot 
>> have a
>>      >     situation with
>>      >      >      >     multiple
>>      >      >      >      >>>>                             VAPs using
>>     the same
>>      >      >     VNI--there is 1:1
>>      >      >      >      >>>>                             mapping
>>     between VAP
>>      >     and VNI.
>>      >      >      >      >>>>
>>      >      >      >      >>>>                             Anoop
>>      >      >      >      >>>>
>>      >      >      >      >>>>                             On Tue, 
>> Oct
>>     22, 2019
>>      >     at 6:06 AM
>>      >      >      >     Joel M.
>>      >      >      >      >>>>                             Halpern
>>      >      >     
>>     >
>>      >     
>>     >>
>>      >      >      >     >     
>>      >     >
>>     
>>      >     > >>>
>>      >      >      >      >>>>
>>      >       
>>     >
>>      >      >     >      >     >>
>>      >      >      >     >     
>>      >     >
>>     
>>      >     > >>>>>
>>      >      >     wrote:
>>      >      >      >      >>>>
>>      >      >      >      >>>>                                  From
>>     what I can
>>      >     tell,
>>      >      >     there
>>      >      >      >     are two
>>      >      >      >      >>>>                                 
>> separate
>>     problems.
>>      >      >      >      >>>>                                 The
>>     document we
>>      >     have is a
>>      >      >      >     VTEP-VTEP
>>      >      >      >      >>>>                                 
>> monitoring
>>      >     document.
>>      >      >     There is no
>>      >      >      >      >>>>                                 need 
>> for that
>>      >     document to
>>      >      >      >     handle the
>>      >      >      >      >>>>                                 
>> multiple
>>     VNI case.
>>      >      >      >      >>>>                                 If 
>> folks
>>     want a
>>      >      >     protocol for doing
>>      >      >      >      >>>>                                 BFD
>>     monitoring
>>      >     of things
>>      >      >      >     behind the
>>      >      >      >      >>>>                                 VTEPs
>>     (multiple
>>      >     VNIs),
>>      >      >     then do
>>      >      >      >     that
>>      >      >      >      >>>>                                 as a 
>> separate
>>      >      >     document.   The
>>      >      >      >      >>>>                                 
>> encoding
>>     will be
>>      >     a tenant
>>      >      >      >     encoding,
>>      >      >      >      >>>>                                 and 
>> thus
>>      >     sesparate from
>>      >      >     what is
>>      >      >      >      >>>>                                 
>> defined
>>     in this
>>      >     document.
>>      >      >      >      >>>>
>>      >      >      >      >>>>                                 Yours,
>>      >      >      >      >>>>                                 Joel
>>      >      >      >      >>>>
>>      >      >      >      >>>>                                 On 
>> 10/21/2019
>>      >     5:07 PM,
>>      >      >     Jeffrey
>>      >      >      >     Haas
>>      >      >      >      >>>>                                 wrote:
>>      >      >      >      >>>>                                 > 
>> Santosh and
>>      >     others,
>>      >      >      >      >>>>                                 >
>>      >      >      >      >>>>                                 > On 
>> Thu, Oct
>>      >     03, 2019 at
>>      >      >      >     07:50:20PM
>>      >      >      >      >>>>                                 +0530,
>>     Santosh P
>>      >     K wrote:
>>      >      >      >      >>>>                                 >>    
>>  Thanks
>>      >     for your
>>      >      >      >     explanation.
>>      >      >      >      >>>>                                 This
>>     helps a lot. I
>>      >      >     would wait
>>      >      >      >     for more
>>      >      >      >      >>>>                                 >>
>>     comments from
>>      >     others
>>      >      >     to see if
>>      >      >      >      >>>>                                 this 
>> what we
>>      >     need in this
>>      >      >      >     draft to be
>>      >      >      >      >>>>                                 >> 
>> supported
>>      >     based on
>>      >      >     that we can
>>      >      >      >      >>>>                                 
>> provide
>>     appropriate
>>      >      >     sections
>>      >      >      >     in the
>>      >      >      >      >>>>                                 draft.
>>      >      >      >      >>>>                                 >
>>      >      >      >      >>>>                                 > The
>>     threads on the
>>      >      >     list have
>>      >      >      >      >>>>                                 
>> spidered
>>     to the
>>      >     point
>>      >      >     where it is
>>      >      >      >      >>>>                                 
>> challenging
>>      >      >      >      >>>>                                 > to
>>     follow what the
>>      >      >     current
>>      >      >      >     status
>>      >      >      >      >>>>                                 of the
>>     draft is,
>>      >     or should
>>      >      >      >     be.  :-)
>>      >      >      >      >>>>                                 >
>>      >      >      >      >>>>                                 >
>>     However, if I've
>>      >      >     followed things
>>      >      >      >      >>>>                                 
>> properly, the
>>      >     question
>>      >      >     below is
>>      >      >      >      >>>>                                 
>> really the
>>      >      >      >      >>>>                                 > 
>> hinge
>>     point on
>>      >     what our
>>      >      >      >      >>>>                                 
>> encapsulation
>>      >     for BFD
>>      >      >     over vxlan
>>      >      >      >      >>>>                                 should
>>     look like.
>>      >      >      >      >>>>                                 > 
>> Correct?
>>      >      >      >      >>>>                                 >
>>      >      >      >      >>>>                                 >
>>     Essentially,
>>      >     do we or
>>      >      >     do we not
>>      >      >      >      >>>>                                 
>> require the
>>      >     ability to
>>      >      >     permit
>>      >      >      >      >>>>                                 
>> multiple BFD
>>      >      >      >      >>>>                                 >
>>     sessions between
>>      >      >     distinct VAPs?
>>      >      >      >      >>>>                                 >
>>      >      >      >      >>>>                                 > If 
>> this
>>     is so,
>>      >     do we
>>      >      >     have a
>>      >      >      >     sense
>>      >      >      >      >>>>                                 as to 
>> how
>>     we should
>>      >      >     proceed?
>>      >      >      >      >>>>                                 >
>>      >      >      >      >>>>                                 > -- 
>> Jeff
>>      >      >      >      >>>>                                 >
>>      >      >      >      >>>>                                 >
>>     [context preserved
>>      >      >     below...]
>>      >      >      >      >>>>                                 >
>>      >      >      >      >>>>                                 >>
>>     Santosh P K
>>      >      >      >      >>>>                                 >>
>>      >      >      >      >>>>                                 >> On
>>     Wed, Sep
>>      >     25, 2019
>>      >      >     at 8:10 AM
>>      >      >      >      >>>>
>>      >       
>>     >
>>      >      >     >      >     >>
>>      >      >      >     >     
>>      >     > >
>>     
>>      >     > >>>
>>      >      >      >      >>>>
>>      >      >       >      >     >
>>      >     
>>     >>
>>      >      >      >     >     
>>      >     > >
>>     
>>      >     > >>>>>
>>      >      >     wrote:
>>      >      >      >      >>>>                                 >>
>>      >      >      >      >>>>                                 >>> Hi
>>     Santosh,
>>      >      >      >      >>>>                                 >>>
>>      >      >      >      >>>>                                 >>>
>>      >      >      >      >>>>                                 >>> 
>> With
>>     regard
>>      >     to the
>>      >      >     question
>>      >      >      >      >>>>                                 
>> whether we
>>      >     should allow
>>      >      >      >     multiple BFD
>>      >      >      >      >>>>                                 
>> sessions
>>      >      >      >      >>>>                                 >>> 
>> for
>>     the same
>>      >     VNI or
>>      >      >     not,
>>      >      >      >     IMHO we
>>      >      >      >      >>>>                                 should
>>     allow it,
>>      >     more
>>      >      >      >     explanation as
>>      >      >      >      >>>>                                 >>> 
>> follows.
>>      >      >      >      >>>>                                 >>>
>>      >      >      >      >>>>                                 >>> 
>> Below
>>     is a
>>      >     figure
>>      >      >     derived from
>>      >      >      >      >>>>                                 
>> figure 2 of
>>      >     RFC8014 (An
>>      >      >      >     Architecture for
>>      >      >      >      >>>>                                 >>>
>>     Data-Center
>>      >     Network
>>      >      >      >      >>>>                                     
>> Virtualization
>>      >     over Layer 3
>>      >      >      >     (NVO3)).
>>      >      >      >      >>>>                                 >>>
>>      >      >      >      >>>>                                 >>>
>>      >              |
>>      >      >      >      >>>>                                  Data
>>     Center Network
>>      >      >     (IP)        |
>>      >      >      >      >>>>                                 >>>
>>      >              |
>>      >      >      >      >>>>
>>      >      >             |
>>      >      >      >      >>>>                                 >>>
>>      >      >      >      >>>>
>>      >      >      >       
>> +-----------------------------------------+
>>      >      >      >      >>>>                                 >>>
>>      >      >             |
>>      >      >      >      >>>>
>>      >           |
>>      >      >      >      >>>>                                 >>>
>>      >      >             |
>>      >      >      >      >>>>                                  
>> Tunnel
>>     Overlay
>>      >          |
>>      >      >      >      >>>>                                 >>>
>>      >      >      >      >>>>
>>      >       +------------+---------+
>>      >      >      >      >>>>
>>      >        +---------+------------+
>>      >      >      >      >>>>                                 >>>   
>>                |
>>      >      >      >      >>>>
>>      >       +----------+-------+ |
>>      >      >           |
>>      >      >      >      >>>>
>>      >       +-------+----------+ |
>>      >      >      >      >>>>                                 >>>
>>      >     | |
>>      >      >     Overlay
>>      >      >      >      >>>>                                 
>> Module  | |
>>      >       | |
>>      >      >     Overlay
>>      >      >      >      >>>>                                 
>> Module  | |
>>      >      >      >      >>>>                                 >>>   
>>                |
>>      >      >      >      >>>>
>>      >       +---------+--------+ |
>>      >      >           |
>>      >      >      >      >>>>
>>      >       +---------+--------+ |
>>      >      >      >      >>>>                                 >>>   
>>                |
>>      >      >           |
>>      >      >      >      >>>>                                     | 
>>           |
>>      >             |
>>      >      >      >          |
>>      >      >      >      >>>>                                 >>>   
>>         NVE1   |
>>      >      >           |
>>      >      >      >      >>>>                                     | 
>>           |
>>      >             |
>>      >      >      >          |
>>      >      >      >      >>>>                                 NVE2
>>      >      >      >      >>>>                                 >>>   
>>                |
>>      >      >      >      >>>>
>>      >       +--------+-------+  |
>>      >      >           |
>>      >      >      >      >>>>
>>      >       +--------+-------+  |
>>      >      >      >      >>>>                                 >>>
>>      >     |  |VNI1
>>      >      >      >     VNI2  VNI1
>>      >      >      >      >>>>                                 |  |  
>>          |  | VNI1
>>      >      >     VNI2 VNI1
>>      >      >      >     |  |
>>      >      >      >      >>>>                                 >>>   
>>                |
>>      >      >      >      >>>>
>>      >       +-+-----+----+---+  |
>>      >      >           |
>>      >      >      >      >>>>
>>      >       +-+-----+-----+--+  |
>>      >      >      >      >>>>                                 >>>
>>      >     |VAP1|
>>      >      >     VAP2|    |
>>      >      >      >      >>>>                                 VAP3 |
>>      >       |VAP1| VAP2|
>>      >      >      >       | VAP3|
>>      >      >      >      >>>>                                 >>>
>>      >      >      >      >>>>
>>      >       +----+-----+----+------+
>>      >      >      >      >>>>
>>      >        +----+-----+-----+-----+
>>      >      >      >      >>>>                                 >>>
>>      >      >       |     |
>>      >      >      >        |
>>      >      >      >      >>>>                                       
>>                |
>>      >      >       |     |
>>      >      >      >      >>>>                                 >>>
>>      >      >       |     |
>>      >      >      >        |
>>      >      >      >      >>>>                                       
>>                |
>>      >      >       |     |
>>      >      >      >      >>>>                                 >>>
>>      >      >       |     |
>>      >      >      >        |
>>      >      >      >      >>>>                                       
>>                |
>>      >      >       |     |
>>      >      >      >      >>>>                                 >>>
>>      >      >      >      >>>>
>>      >      >      >
>>      >       
>> -------+-----+----+-------------------+-----+-----+-------
>>      >      >      >      >>>>                                 >>>
>>      >      >       |     |
>>      >      >      >        |
>>      >      >      >      >>>>                                      
>>   Tenant        |
>>      >      >       |     |
>>      >      >      >      >>>>                                 >>>
>>      >     TSI1 |
>>      >      >     TSI2|    |
>>      >      >      >      >>>>                                 TSI3
>>      >     TSI1| TSI2|
>>      >      >      >       |TSI3
>>      >      >      >      >>>>                                 >>>
>>      >      >     +---+ +---+
>>      >      >      >      >>>>                                 +---+
>>      >       +---+
>>      >      >     +---+
>>      >      >      >       +---+
>>      >      >      >      >>>>                                 >>>
>>      >      >     |TS1| |TS2|
>>      >      >      >      >>>>                                 |TS3|
>>      >       |TS4|
>>      >      >     |TS5|
>>      >      >      >       |TS6|
>>      >      >      >      >>>>                                 >>>
>>      >      >     +---+ +---+
>>      >      >      >      >>>>                                 +---+
>>      >       +---+
>>      >      >     +---+
>>      >      >      >       +---+
>>      >      >      >      >>>>                                 >>>
>>      >      >      >      >>>>                                 >>> 
>> To my
>>      >      >     understanding, the BFD
>>      >      >      >      >>>>                                 
>> sessions
>>     between
>>      >     NVE1
>>      >      >     and NVE2 are
>>      >      >      >      >>>>                                 
>> actually
>>      >      >      >      >>>>                                 >>>
>>     initiated and
>>      >      >     terminated
>>      >      >      >     at VAP
>>      >      >      >      >>>>                                 of 
>> NVE.
>>      >      >      >      >>>>                                 >>>
>>      >      >      >      >>>>                                 >>> 
>> If the
>>      >     network operator
>>      >      >      >     want to
>>      >      >      >      >>>>                                 set up
>>     one BFD
>>      >     session
>>      >      >     between
>>      >      >      >     VAP1 of
>>      >      >      >      >>>>                                 >>> 
>> NVE1
>>     and VAP1of
>>      >      >     NVE2, at the
>>      >      >      >      >>>>                                 same 
>> time
>>      >     another BFD
>>      >      >     session
>>      >      >      >      >>>>                                 
>> between
>>     VAP3 of
>>      >      >      >      >>>>                                 >>> 
>> NVE1 and
>>      >     VAP3 of NVE2,
>>      >      >      >     although
>>      >      >      >      >>>>                                 the 
>> two
>>     BFD sessions
>>      >      >     are for
>>      >      >      >     the same
>>      >      >      >      >>>>                                 >>> 
>> VNI1, I
>>      >     believe it's
>>      >      >      >     reasonable,
>>      >      >      >      >>>>                                 so 
>> that's
>>     why I
>>      >     think we
>>      >      >      >     should allow it
>>      >      >      >      >>>>
>>      >      >      >      >>>>
>>      >      >      >       
>> _______________________________________________
>>      >      >      >      >>>>                                 nvo3
>>     mailing list
>>      >      >      >      >>>> nvo3@ietf.org 
>>     >
>>      >     
>>     >>
>>      >      >     
>>     >
>>      >     
>>     >>>
>>     
>>      >     >
>>      >      >     
>>     >>
>>      >      >      >     
>>     >
>>      >     
>>     >>>>
>>      >      >      >      >>>> 
>> https://www.ietf.org/mailman/listinfo/nvo3
>>      >      >      >      >>>>
>>      >      >      >
>>      >      >
>>      >
>> 

--=-8g7zpW5Bf20wEZ8pdC2M
Content-Type: text/html; charset=us-ascii


I suspect silicon implementations will have a problem with saying that they can be set to anything and MUST be ignored on reception. Your logic is sound, it's just that I fear you'll break many existing implementations. I recommend sticking with the 127/8 address for this case.

Dinesh

On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern <jmh@joelhalpern.com> wrote:
In all the discussion about what VNI to use and multiple VNI support, I lsot track.  Sorry.

Still, the earlier documents did not specify the IP to use.  That does NOT mean that we are required in later revisions of the document to allow anything the client wants.

Having said that, we could add text saying that since the IP address in the BFD request in VNI 0 is effectively meaningless, it can be set to any value on transmission and must be ignored on reception.
As far as I can tell, it is definitional that the VtEP does not have any assigned IP address for VNI 0, so we can't expect that address.

Yours,
Joel

On 10/29/2019 11:10 AM, Anoop Ghanwani wrote:

Hi Joel,

Yes, existing implementations use VNI 0 for BFD over VXLAN.  Here are a couple of references:
https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html 
https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665 

I guess this document has been evolving and I have not kept up with it.  The version I had reviewed and commented on originally allowed for VNI 0.  The -04 version of the draft has this:
https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7
What version are you referring to?

Thanks,
Anoop



On Mon, Oct 28, 2019 at 12:55 PM Joel M. Halpern <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> wrote:

    You are saying that there are existing implementations using VNI 0 for
    this?  Given that previous versions of the spec explicitly disallowed
    VNI 0, I am having trouble with your objecting that a spec for how to
    run over VNI 0 breask existing implementations.

    Note that when there is a good technical reason, the IETF does change
    Internet Drafts in ways that break early implementations.  That is the
    price of standardization.

    Yours,
    Joel

    On 10/28/2019 2:30 PM, Anoop Ghanwani wrote:
     > Hi Joel,
     >
     > Writing the spec in that way would make the current, inter-operable
     > implementation of multiple vendors non-compliant with the spec.
     >
     > Thanks,
     > Anoop
     >
     > On Mon, Oct 28, 2019 at 11:07 AM Joel M. Halpern
    <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
     > <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>> wrote:
     >
     >     I assumed this was only for the case where a tenant VNI was
    being used.
     >
     >     For the 0 VNI (which is what I prefer), always (MUST) use the
    loopback
     >     address.  There are no addresses assigned to the VTEP in that
    space.
     >     There is no IRB in that space.
     >
     >     Yours,
     >     Joel
     >
     >     On 10/28/2019 1:58 PM, Anoop Ghanwani wrote:
     >      > Joel,
     >      >
     >      > Are we going to qualify this by VNI?  There's a bunch of
     >     implementations
     >      > out there that don't use a tenant IP or a loopback with
    VNI 0--they
     >      > simply repeat the underlay IP in the inner IPDA.
     >      >
     >      > Thanks,
     >      > Anoop
     >      >
     >      > On Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern
     >     <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>
     >      > <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>> wrote:
     >      >
     >      >     I can live with saying that you SHOULD use loopback,
    and MAY
     >     instead
     >      >     use
     >      >     an IP address in the customer space known to be owned
    by the VTEP
     >      >     device
     >      >     when such exists.
     >      >
     >      >     Yours,
     >      >     Joel
     >      >
     >      >     On 10/28/2019 1:32 PM, Anoop Ghanwani wrote:
     >      >      > Hi Joel,
     >      >      >
     >      >      > Perhaps we need to say use of an address owned by
    the device
     >      >     containing
     >      >      > the VTEP.
     >      >      >
     >      >      > Or are you suggesting that the use of the loopback
    address
     >     space
     >      >     is a MUST?
     >      >      >
     >      >      > Anoop
     >      >      >
     >      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern
     >      >     <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>
     >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>
     >      >      > <mailto:jmh@joelhalpern.com
    <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com
    <mailto:jmh@joelhalpern.com>>
     >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>>> wrote:
     >      >      >
     >      >      >     There is something I am missing in your assumption
     >     about IRB.
     >      >      >
     >      >      >     As I understand VxLAN, the VTEP is under the
    control
     >     of the
     >      >     operator.
     >      >      >     As such, it is a pure bridge.  If you run IRB
    behind
     >     it, that
     >      >     is fine.
     >      >      >     Yes, an operator may offer IRB.  But as I
    understand it,
     >      >     conceptually,
     >      >      >     in terms of the VxLAN architecture the IRB is
    an entity
     >      >     behind the
     >      >      >     VTEP,
     >      >      >     not part of the VTEP.
     >      >      >
     >      >      >     Yours,
     >      >      >     Joel
     >      >      >
     >      >      >     On 10/28/2019 12:23 PM, Anoop Ghanwani wrote:
     >      >      >      > Santosh,
     >      >      >      >
     >      >      >      > Does it have to be a MUST?  What if I am running
     >     IRB and there
     >      >      >     are IP
     >      >      >      > addresses per VNI assigned to the VTEPs?     Why can the
     >      >     operator not
     >      >      >      > choose to use those?
     >      >      >      >
     >      >      >      > Anoop
     >      >      >      >
     >      >      >      > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K
     >      >      >      > <santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>
     >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>>
     >      >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>
     >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>>>
     >      >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>
     >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>>
     >      >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>
     >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>>>>> wrote:
     >      >      >      >
     >      >      >      >     Dinesh, Anoop et all,
     >      >      >      >           Lets us know if this text works
    for 127/8
     >      >     address range?
     >      >      >      >
     >      >      >      >     [proposed text for firewall]
     >      >      >      >
     >      >      >      >     "As per section 4 inner destination IP
    address
     >     MUST be
     >      >     set to
     >      >      >     127/8
     >      >      >      >     address. There may be firewall configured on
     >     VTEP to
     >      >     block 127/8
     >      >      >      >     address range if set as destination IP
    in inner IP
     >      >     header. It is
     >      >      >      >     recommended to allow 127/8 range address
    through
     >      >     firewall only if
     >      >      >      >     127/8 IP address is set as destination
    address
     >     in inner IP
     >      >      >     header."
     >      >      >      >
     >      >      >      >
     >      >      >      >     In section 4 we are talking about using
    127/8
     >     and not
     >      >     really
     >      >      >     giving
     >      >      >      >     reason why. I think we should have text
    as RFC 5884
     >      >     has mentioned
     >      >      >      >     with below text.
     >      >      >      >
     >      >      >      >     [From RFC 5884]
     >      >      >      >     "The motivation for using the address range
     >     127/8 is
     >      >     the same as
     >      >      >      >     specified in Section 2.1 of [RFC4379]
     >      >      >      >         <https://tools.ietf.org/html/rfc4379#section-2.1>.
     >      >     This is an
     >      >      >      >     exception to the behavior defined in
    [RFC1122
     >      >      >      >     <https://tools.ietf.org/html/rfc1122>]."
     >      >      >      >
     >      >      >      >
     >      >      >      >
     >      >      >      >     Thanks
     >      >      >      >     Santosh P K
     >      >      >      >
     >      >      >      >
     >      >      >      >
     >      >      >      >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt
     >      >     <didutt@gmail.com <mailto:didutt@gmail.com>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>
     >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>
     >      >      >     <mailto:didutt@gmail.com
    <mailto:didutt@gmail.com> <mailto:didutt@gmail.com
    <mailto:didutt@gmail.com>>
     >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>>
     >      >      >      >     <mailto:didutt@gmail.com
    <mailto:didutt@gmail.com>
     >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>
     >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>
     >      >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>
     >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>>>> wrote:
     >      >      >      >
     >      >      >      >         Looks good to me Greg. I see that
    the text
     >     around
     >      >     the use
     >      >      >     of the
     >      >      >      >         inner IP address as also quite
    acceptable. Will
     >      >     you add any
     >      >      >      >         words about the firewall?
     >      >      >      >
     >      >      >      >         Dinesh
     >      >      >      >
     >      >      >      >         On Wed, Oct 23, 2019 at 8:36 PM,
    Greg Mirsky
     >      >      >      >         <gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>
     >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>>>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>
    <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>
     >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>>>>
     >      >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>
    <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>
     >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>
    <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>>>> wrote:
     >      >      >      >>         Hi Dinesh, et al.,
     >      >      >      >>         please check the updated version that
     >     removed the
     >      >      >     reference to
     >      >      >      >>         Hypervisor in the text and Figure 1.
     >      >      >      >>
     >      >      >      >>         Regards,
     >      >      >      >>         Greg
     >      >      >      >>
     >      >      >      >>         On Wed, Oct 23, 2019 at 10:47 AM
    Santosh P K
     >      >      >      >>         <santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>
     >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>>
     >      >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>
     >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>>>
     >      >      >      >>             <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>
     >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>>
     >      >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>
     >      >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>
     >     <mailto:santosh.pallagatti@gmail.com
    <mailto:santosh.pallagatti@gmail.com>>>>>> wrote:
     >      >      >      >>
     >      >      >      >>             Dinesh,
     >      >      >      >>                  Please see my
    inline comments [SPK]
     >      >      >      >>
     >      >      >      >>
     >      >      >      >>                 - In section 3, there's a
    sentence
     >     that
     >      >     is: "BFD
     >      >      >      >>                 packets intended for a
    Hypervisor
     >     VTEP MUST
     >      >      >     NOT..". I
     >      >      >      >>                 recommend getting rid of
    the word
     >      >     "Hypervisor" ashe
     >      >      >      >>                 logic applies to any VTEP.
     >      >      >      >>
     >      >      >      >>             [SPK] Thanks for comments. We will
     >     change this.
     >      >      >      >>
     >      >      >      >>                 - You already explained the
     >     precedence of
     >      >     the use of
     >      >      >      >>                 127/8 address in the inner
    header in
     >      >     MPLS. I have no
     >      >      >      >>                 specific comments in that
    area. I have
     >      >     only two
     >      >      >      >>                 questions:
     >      >      >      >>                    - Has anybody verified
    that the
     >     use of
     >      >     127/8
     >      >      >      >>                 address (and the right MAC)
    works with
     >      >     existing
     >      >      >      >>                 implementations, including
    the silicon
     >      >     ones? If this
     >      >      >      >>                 doesn't work there, is it worth
     >     adding the
     >      >      >     possibilit
     >      >      >      >>                 y of another address, one
    that is
     >     owned
     >      >     by the
     >      >      >     VTEP node?
     >      >      >      >>
     >      >      >      >>                    - Do we know if
    Firewalls stop
     >     such VXLAN
     >      >      >     packets?
     >      >      >      >>                 I ask this because VXLAN
    has an IP
     >     header
     >      >     and I
     >      >      >     don't
     >      >      >      >>                 know if firewalls stop packets
     >     with 127/8
     >      >     in the
     >      >      >     inner
     >      >      >      >>                 header. If not, is it worth
    adding a
     >      >     sentence to say
     >      >      >      >>                 that firewalls  allow such
     >     packets? The
     >      >     use of a
     >      >      >      >>                 non-127/8 address may alleviate
     >     this case
     >      >     as well.
     >      >      >      >>
     >      >      >      >>             [SPK] I think we may need to
    add the text
     >      >     about firewall
     >      >      >      >>             as some checks in firewall will be
     >     there if
     >      >     they are not
     >      >      >      >>             already using MPLS OAM which
    has inner IP
     >      >     header with
     >      >      >      >>             127/8 address range.
     >      >      >      >>
     >      >      >      >>
     >      >      >      >>                 The rest of the draft looks
    good
     >     to me,
     >      >      >      >>
     >      >      >      >>                 Dinesh
     >      >      >      >>
     >      >      >      >>                 On Wed, Oct 23, 2019 at
    7:58 AM,
     >     Greg Mirsky
     >      >      >      >>                 <gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>
     >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>>>
     >      >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>
    <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>>
     >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>
    <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>
     >      >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>
    <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>>>>
     >      >      >      >>                 wrote:
     >      >      >      >>>                 Hi Dinesh,
     >      >      >      >>>                 I greatly appreciate your
    comments.
     >      >     Please heave a
     >      >      >      >>>                 look at the attached copy
    of the
     >     working
     >      >      >     version and
     >      >      >      >>>                 its diff to -07 (latest in the
     >     datatracker).
     >      >      >      >>>
     >      >      >      >>>                 Regards,
     >      >      >      >>>                 Greg
     >      >      >      >>>
     >      >      >      >>>                 On Tue, Oct 22, 2019 at
    9:52 PM
     >     Dinesh Dutt
     >      >      >      >>>                 <didutt@gmail.com
    <mailto:didutt@gmail.com>
     >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>
     >      >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>
     >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>
     >      >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>>
     >      >      >     <mailto:didutt@gmail.com
    <mailto:didutt@gmail.com> <mailto:didutt@gmail.com
    <mailto:didutt@gmail.com>>
     >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>
     >      >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>
     >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>
    <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>>>> wrote:
     >      >      >      >>>
     >      >      >      >>>                     I have the same
    feeling as Anoop.
     >      >     Greg, can you
     >      >      >      >>>                     please point me to the
    latest
     >     draft
     >      >     so that
     >      >      >     I can
     >      >      >      >>>                     quickly glance through
    it to be
     >      >     doubly sure,
     >      >      >      >>>
     >      >      >      >>>                     Dinesh
     >      >      >      >>>
     >      >      >      >>>                     On Wed, Oct 23, 2019
    at 4:35 AM,
     >      >     Anoop Ghanwani
     >      >      >      >>>                     <anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>
     >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>
     >      >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>>>
     >      >      >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>
     >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>
    <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>
     >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>>>
     >      >      >      >>>                         <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>
     >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>
     >      >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>>>
     >      >      >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>
     >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>
     >      >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>
     >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>>>>>> wrote:
     >      >      >      >>>>                     Greg,
     >      >      >      >>>>
     >      >      >      >>>>                     I think the draft is
    fine as is.
     >      >      >      >>>>
     >      >      >      >>>>                     I discussion with
    Xiao Min was
     >      >     about #3 and I
     >      >      >      >>>>                     see that as
    unnecessary until we
     >      >     have a draft
     >      >      >      >>>>                     that explains why that is
     >     needed in the
     >      >      >     context
     >      >      >      >>>>                     of the NVO3 architecture.
     >      >      >      >>>>
     >      >      >      >>>>                     Anoop
     >      >      >      >>>>
     >      >      >      >>>>                     On Tue, Oct 22, 2019
    at 11:17 AM
     >      >     Greg Mirsky
     >      >      >      >>>>                         <gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>
     >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>>>
     >      >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>
    <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>>
     >      >      >      >>>>
     >       <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>>
     >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>>>
     >      >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>
     >      >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>
     >     <mailto:gregimirsky@gmail.com
    <mailto:gregimirsky@gmail.com>>>>>> wrote:
     >      >      >      >>>>
     >      >      >      >>>>                         Hi Anoop, et al.,
     >      >      >      >>>>                         I agree with your
     >     understanding
     >      >     of what is
     >      >      >      >>>>                         being defined in
    the current
     >      >     version
     >      >      >     of the
     >      >      >      >>>>                         BFD over VxLAN
     >     specification.
     >      >     But, as I
     >      >      >      >>>>                         understand, the WG is
     >      >     discussing the scope
     >      >      >      >>>>                         before the WGLC
    is closed. I
     >      >     believe there
     >      >      >      >>>>                         are three options:
     >      >      >      >>>>
     >      >      >      >>>>                          1. single BFD
    session
     >     between
     >      >     two VTEPs
     >      >      >      >>>>                          2. single BFD
    session
     >     per VNI
     >      >     between
     >      >      >     two VTEPs
     >      >      >      >>>>                          3. multiple BFD
     >     sessions per
     >      >     VNI between
     >      >      >      >>>>                             two VTEPs
     >      >      >      >>>>
     >      >      >      >>>>                         The current text
     >     reflects #2. Is WG
     >      >      >     accepts
     >      >      >      >>>>                         this scope? If
    not, which
     >      >     option WG would
     >      >      >      >>>>                         accept?
     >      >      >      >>>>
     >      >      >      >>>>                         Regards,
     >      >      >      >>>>                         Greg
     >      >      >      >>>>
     >      >      >      >>>>                         On Tue, Oct 22,
    2019 at
     >     2:09 PM
     >      >     Anoop
     >      >      >      >>>>                         Ghanwani
     >     <anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>
    <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>
     >      >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>>>
     >      >      >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>
     >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>
    <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>
     >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>>>
     >      >      >      >>>>
     >       <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>>
     >      >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>>>
     >      >      >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>
     >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>
     >      >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>
     >     <mailto:anoop@alumni.duke.edu
    <mailto:anoop@alumni.duke.edu>>>>>> wrote:
     >      >      >      >>>>
     >      >      >      >>>>                             I concur with
    Joel's
     >     assessment
     >      >      >     with the
     >      >      >      >>>>                             following
     >     clarifications.
     >      >      >      >>>>
     >      >      >      >>>>                             The current
    document
     >     is already
     >      >      >     capable
     >      >      >      >>>>                             of monitoring
     >     multiple VNIs
     >      >      >     between VTEPs.
     >      >      >      >>>>
     >      >      >      >>>>                             The issue under
     >     discussion
     >      >     was how
     >      >      >     do we
     >      >      >      >>>>                             use BFD to
    monitor
     >     multiple
     >      >     VAPs that
     >      >      >      >>>>                             use the same VNI
     >     between a
     >      >     pair of
     >      >      >      >>>>                             VTEPs.  The
    use case for
     >      >     this is not
     >      >      >      >>>>                             clear to me,
    as from my
     >      >     understanding,
     >      >      >      >>>>                             we cannot have a
     >     situation with
     >      >      >     multiple
     >      >      >      >>>>                             VAPs using
    the same
     >      >     VNI--there is 1:1
     >      >      >      >>>>                             mapping
    between VAP
     >     and VNI.
     >      >      >      >>>>
     >      >      >      >>>>                             Anoop
     >      >      >      >>>>
     >      >      >      >>>>                             On Tue, Oct
    22, 2019
     >     at 6:06 AM
     >      >      >     Joel M.
     >      >      >      >>>>                             Halpern
     >      >     <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>
     >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>
     >      >      >     <mailto:jmh@joelhalpern.com
    <mailto:jmh@joelhalpern.com>
     >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
     >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>>
     >      >      >      >>>>
     >       <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>
     >      >     <mailto:jmh@joelhalpern.com
    <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com
    <mailto:jmh@joelhalpern.com>>>
     >      >      >     <mailto:jmh@joelhalpern.com
    <mailto:jmh@joelhalpern.com>
     >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>
    <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>
     >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>>>>
     >      >     wrote:
     >      >      >      >>>>
     >      >      >      >>>>                                  From
    what I can
     >     tell,
     >      >     there
     >      >      >     are two
     >      >      >      >>>>                                 separate
    problems.
     >      >      >      >>>>                                 The
    document we
     >     have is a
     >      >      >     VTEP-VTEP
     >      >      >      >>>>                                 monitoring
     >     document.
     >      >     There is no
     >      >      >      >>>>                                 need for that
     >     document to
     >      >      >     handle the
     >      >      >      >>>>                                 multiple
    VNI case.
     >      >      >      >>>>                                 If folks
    want a
     >      >     protocol for doing
     >      >      >      >>>>                                 BFD
    monitoring
     >     of things
     >      >      >     behind the
     >      >      >      >>>>                                 VTEPs
    (multiple
     >     VNIs),
     >      >     then do
     >      >      >     that
     >      >      >      >>>>                                 as a separate
     >      >     document.   The
     >      >      >      >>>>                                 encoding
    will be
     >     a tenant
     >      >      >     encoding,
     >      >      >      >>>>                                 and thus
     >     sesparate from
     >      >     what is
     >      >      >      >>>>                                 defined
    in this
     >     document.
     >      >      >      >>>>
     >      >      >      >>>>                                 Yours,
     >      >      >      >>>>                                 Joel
     >      >      >      >>>>
     >      >      >      >>>>                                 On 10/21/2019
     >     5:07 PM,
     >      >     Jeffrey
     >      >      >     Haas
     >      >      >      >>>>                                 wrote:
     >      >      >      >>>>                                 > Santosh and
     >     others,
     >      >      >      >>>>                                 >
     >      >      >      >>>>                                 > On Thu, Oct
     >     03, 2019 at
     >      >      >     07:50:20PM
     >      >      >      >>>>                                 +0530,
    Santosh P
     >     K wrote:
     >      >      >      >>>>                                 >>     Thanks
     >     for your
     >      >      >     explanation.
     >      >      >      >>>>                                 This
    helps a lot. I
     >      >     would wait
     >      >      >     for more
     >      >      >      >>>>                                 >>
    comments from
     >     others
     >      >     to see if
     >      >      >      >>>>                                 this what we
     >     need in this
     >      >      >     draft to be
     >      >      >      >>>>                                 >> supported
     >     based on
     >      >     that we can
     >      >      >      >>>>                                 provide
    appropriate
     >      >     sections
     >      >      >     in the
     >      >      >      >>>>                                 draft.
     >      >      >      >>>>                                 >
     >      >      >      >>>>                                 > The
    threads on the
     >      >     list have
     >      >      >      >>>>                                 spidered
    to the
     >     point
     >      >     where it is
     >      >      >      >>>>                                 challenging
     >      >      >      >>>>                                 > to
    follow what the
     >      >     current
     >      >      >     status
     >      >      >      >>>>                                 of the
    draft is,
     >     or should
     >      >      >     be.  :-)
     >      >      >      >>>>                                 >
     >      >      >      >>>>                                 >
    However, if I've
     >      >     followed things
     >      >      >      >>>>                                 properly, the
     >     question
     >      >     below is
     >      >      >      >>>>                                 really the
     >      >      >      >>>>                                 > hinge
    point on
     >     what our
     >      >      >      >>>>                                 encapsulation
     >     for BFD
     >      >     over vxlan
     >      >      >      >>>>                                 should
    look like.
     >      >      >      >>>>                                 > Correct?
     >      >      >      >>>>                                 >
     >      >      >      >>>>                                 >
    Essentially,
     >     do we or
     >      >     do we not
     >      >      >      >>>>                                 require the
     >     ability to
     >      >     permit
     >      >      >      >>>>                                 multiple BFD
     >      >      >      >>>>                                 >
    sessions between
     >      >     distinct VAPs?
     >      >      >      >>>>                                 >
     >      >      >      >>>>                                 > If this
    is so,
     >     do we
     >      >     have a
     >      >      >     sense
     >      >      >      >>>>                                 as to how
    we should
     >      >     proceed?
     >      >      >      >>>>                                 >
     >      >      >      >>>>                                 > -- Jeff
     >      >      >      >>>>                                 >
     >      >      >      >>>>                                 >
    [context preserved
     >      >     below...]
     >      >      >      >>>>                                 >
     >      >      >      >>>>                                 >>
    Santosh P K
     >      >      >      >>>>                                 >>
     >      >      >      >>>>                                 >> On
    Wed, Sep
     >     25, 2019
     >      >     at 8:10 AM
     >      >      >      >>>>
     >       <xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>
    <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>
     >      >     <mailto:xiao.min2@zte.com.cn
    <mailto:xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn
    <mailto:xiao.min2@zte.com.cn>>>
     >      >      >     <mailto:xiao.min2@zte.com.cn
    <mailto:xiao.min2@zte.com.cn>
     >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>
    <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>
     >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>>>
     >      >      >      >>>>
     >      >       <mailto:xiao.min2@zte.com.cn
    <mailto:xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn
    <mailto:xiao.min2@zte.com.cn>>
     >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>
    <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>>
     >      >      >     <mailto:xiao.min2@zte.com.cn
    <mailto:xiao.min2@zte.com.cn>
     >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>
    <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>
     >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>>>>>
     >      >     wrote:
     >      >      >      >>>>                                 >>
     >      >      >      >>>>                                 >>> Hi
    Santosh,
     >      >      >      >>>>                                 >>>
     >      >      >      >>>>                                 >>>
     >      >      >      >>>>                                 >>> With
    regard
     >     to the
     >      >     question
     >      >      >      >>>>                                 whether we
     >     should allow
     >      >      >     multiple BFD
     >      >      >      >>>>                                 sessions
     >      >      >      >>>>                                 >>> for
    the same
     >     VNI or
     >      >     not,
     >      >      >     IMHO we
     >      >      >      >>>>                                 should
    allow it,
     >     more
     >      >      >     explanation as
     >      >      >      >>>>                                 >>> follows.
     >      >      >      >>>>                                 >>>
     >      >      >      >>>>                                 >>> Below
    is a
     >     figure
     >      >     derived from
     >      >      >      >>>>                                 figure 2 of
     >     RFC8014 (An
     >      >      >     Architecture for
     >      >      >      >>>>                                 >>>
    Data-Center
     >     Network
     >      >      >      >>>>                                     Virtualization
     >     over Layer 3
     >      >      >     (NVO3)).
     >      >      >      >>>>                                 >>>
     >      >      >      >>>>                                 >>>
     >              |
     >      >      >      >>>>                                  Data
    Center Network
     >      >     (IP)        |
     >      >      >      >>>>                                 >>>
     >              |
     >      >      >      >>>>
     >      >             |
     >      >      >      >>>>                                 >>>
     >      >      >      >>>>
     >      >      >       +-----------------------------------------+
     >      >      >      >>>>                                 >>>
     >      >             |
     >      >      >      >>>>
     >           |
     >      >      >      >>>>                                 >>>
     >      >             |
     >      >      >      >>>>                                  Tunnel
    Overlay
     >          |
     >      >      >      >>>>                                 >>>
     >      >      >      >>>>
     >       +------------+---------+
     >      >      >      >>>>
     >        +---------+------------+
     >      >      >      >>>>                                 >>>                  |
     >      >      >      >>>>
     >       +----------+-------+ |
     >      >           |
     >      >      >      >>>>
     >       +-------+----------+ |
     >      >      >      >>>>                                 >>>
     >     | |
     >      >     Overlay
     >      >      >      >>>>                                 Module  | |
     >       | |
     >      >     Overlay
     >      >      >      >>>>                                 Module  | |
     >      >      >      >>>>                                 >>>                  |
     >      >      >      >>>>
     >       +---------+--------+ |
     >      >           |
     >      >      >      >>>>
     >       +---------+--------+ |
     >      >      >      >>>>                                 >>>                  |
     >      >           |
     >      >      >      >>>>                                     |           |
     >             |
     >      >      >          |
     >      >      >      >>>>                                 >>>           NVE1   |
     >      >           |
     >      >      >      >>>>                                     |           |
     >             |
     >      >      >          |
     >      >      >      >>>>                                 NVE2
     >      >      >      >>>>                                 >>>                  |
     >      >      >      >>>>
     >       +--------+-------+  |
     >      >           |
     >      >      >      >>>>
     >       +--------+-------+  |
     >      >      >      >>>>                                 >>>
     >     |  |VNI1
     >      >      >     VNI2  VNI1
     >      >      >      >>>>                                 |  |           |  | VNI1
     >      >     VNI2 VNI1
     >      >      >     |  |
     >      >      >      >>>>                                 >>>                  |
     >      >      >      >>>>
     >       +-+-----+----+---+  |
     >      >           |
     >      >      >      >>>>
     >       +-+-----+-----+--+  |
     >      >      >      >>>>                                 >>>
     >     |VAP1|
     >      >     VAP2|    |
     >      >      >      >>>>                                 VAP3 |
     >       |VAP1| VAP2|
     >      >      >       | VAP3|
     >      >      >      >>>>                                 >>>
     >      >      >      >>>>
     >       +----+-----+----+------+
     >      >      >      >>>>
     >        +----+-----+-----+-----+
     >      >      >      >>>>                                 >>>
     >      >       |     |
     >      >      >        |
     >      >      >      >>>>                                                      |
     >      >       |     |
     >      >      >      >>>>                                 >>>
     >      >       |     |
     >      >      >        |
     >      >      >      >>>>                                                      |
     >      >       |     |
     >      >      >      >>>>                                 >>>
     >      >       |     |
     >      >      >        |
     >      >      >      >>>>                                                      |
     >      >       |     |
     >      >      >      >>>>                                 >>>
     >      >      >      >>>>
     >      >      >
     >       -------+-----+----+-------------------+-----+-----+-------
     >      >      >      >>>>                                 >>>
     >      >       |     |
     >      >      >        |
     >      >      >      >>>>                                        Tenant        |
     >      >       |     |
     >      >      >      >>>>                                 >>>
     >     TSI1 |
     >      >     TSI2|    |
     >      >      >      >>>>                                 TSI3
     >     TSI1| TSI2|
     >      >      >       |TSI3
     >      >      >      >>>>                                 >>>
     >      >     +---+ +---+
     >      >      >      >>>>                                 +---+
     >       +---+
     >      >     +---+
     >      >      >       +---+
     >      >      >      >>>>                                 >>>
     >      >     |TS1| |TS2|
     >      >      >      >>>>                                 |TS3|
     >       |TS4|
     >      >     |TS5|
     >      >      >       |TS6|
     >      >      >      >>>>                                 >>>
     >      >     +---+ +---+
     >      >      >      >>>>                                 +---+
     >       +---+
     >      >     +---+
     >      >      >       +---+
     >      >      >      >>>>                                 >>>
     >      >      >      >>>>                                 >>> To my
     >      >     understanding, the BFD
     >      >      >      >>>>                                 sessions
    between
     >     NVE1
     >      >     and NVE2 are
     >      >      >      >>>>                                 actually
     >      >      >      >>>>                                 >>>
    initiated and
     >      >     terminated
     >      >      >     at VAP
     >      >      >      >>>>                                 of NVE.
     >      >      >      >>>>                                 >>>
     >      >      >      >>>>                                 >>> If the
     >     network operator
     >      >      >     want to
     >      >      >      >>>>                                 set up
    one BFD
     >     session
     >      >     between
     >      >      >     VAP1 of
     >      >      >      >>>>                                 >>> NVE1
    and VAP1of
     >      >     NVE2, at the
     >      >      >      >>>>                                 same time
     >     another BFD
     >      >     session
     >      >      >      >>>>                                 between
    VAP3 of
     >      >      >      >>>>                                 >>> NVE1 and
     >     VAP3 of NVE2,
     >      >      >     although
     >      >      >      >>>>                                 the two
    BFD sessions
     >      >     are for
     >      >      >     the same
     >      >      >      >>>>                                 >>> VNI1, I
     >     believe it's
     >      >      >     reasonable,
     >      >      >      >>>>                                 so that's
    why I
     >     think we
     >      >      >     should allow it
     >      >      >      >>>>
     >      >      >      >>>>
     >      >      >       _______________________________________________
     >      >      >      >>>>                                 nvo3
    mailing list
     >      >      >      >>>> nvo3@ietf.org <mailto:nvo3@ietf.org>
    <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>
     >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>
    <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>>
     >      >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>
    <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>
     >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>
    <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>>>
    <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>
     >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>
     >      >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>
    <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>>
     >      >      >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>
    <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>
     >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>
    <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>>>>
     >      >      >      >>>> https://www.ietf.org/mailman/listinfo/nvo3
     >      >      >      >>>>
     >      >      >
     >      >
     >



--=-8g7zpW5Bf20wEZ8pdC2M--



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Date: Wed, 30 Oct 2019 07:02:45 +0500
From: Dinesh Dutt 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Jeffrey Haas 
Cc: Santosh P K , Anoop Ghanwani , Greg Mirsky , "Joel M. Halpern" , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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On Wed, Oct 30, 2019 at 2:26 AM, Jeffrey Haas  wrote:
> Santosh,
> 
> On Mon, Oct 28, 2019 at 10:24:06PM +0530, Santosh P K wrote:
>>  "As per section 4 inner destination IP address MAY be set to 127/8 
>> address.
>>  There could be firewall configured on VTEP to block 127/8 address 
>> range if
>>  set as destination IP in inner IP header. It is recommended to 
>> allow 127/8
>>  range address through firewall only if inner IP header's 
>> destination IP is
>>  set to 127/8 IP address."
> 
> Would it be reasonable to suggest "SHOULD be set"?

This sounds reasonable to me.

Dinesh
> 
> Our motivation in this section is to offer what is likely to be a 
> reasonable
> default, without providing restriction from something more amenable 
> to some
> provider's requirement.
> 
> Similarly, based on this text, we'll get asked about "recommended" vs.
> "RECOMMENDED".  What level of strength do you think we should have 
> here?
> 
> 
> -- Jeff

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On Wed, Oct 30, 2019 at 2:26 AM, Jeffrey Haas <jhaas@pfrc.org> wrote:
Santosh,

On Mon, Oct 28, 2019 at 10:24:06PM +0530, Santosh P K wrote:

 "As per section 4 inner destination IP address MAY be set to 127/8 address.
 There could be firewall configured on VTEP to block 127/8 address range if
 set as destination IP in inner IP header. It is recommended to allow 127/8
 range address through firewall only if inner IP header's destination IP is
 set to 127/8 IP address."


Would it be reasonable to suggest "SHOULD be set"?

This sounds reasonable to me.

Dinesh

Our motivation in this section is to offer what is likely to be a reasonable
default, without providing restriction from something more amenable to some
provider's requirement.

Similarly, based on this text, we'll get asked about "recommended" vs.
"RECOMMENDED".  What level of strength do you think we should have here?


-- Jeff


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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Dinesh Dutt 
Cc: Anoop Ghanwani , Santosh P K , Greg Mirsky , Jeffrey Haas , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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From: "Joel M. Halpern" 
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I presume that most silicon implementations of VxLAN VTEPs do not have 
any logic for trapping out BFD packets under any circumstances.  While 
some may have been built anticipating this draft, we have to assume that 
many will not be able to support this.  So it goes when you add features 
to a protocol.

I can live with requrieing 127/8, or requiring ignoring the IP 
destination address.  I do think we should be clear about what is going 
in the field (since BFD requires it), and how it is to be processed.

Yours,
Joel

On 10/29/2019 9:59 PM, Dinesh Dutt wrote:
> I suspect silicon implementations will have a problem with saying that 
> they can be set to anything and MUST be ignored on reception. Your logic 
> is sound, it's just that I fear you'll break many existing 
> implementations. I recommend sticking with the 127/8 address for this case.
> 
> Dinesh
> 
> On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern  
> wrote:
>> In all the discussion about what VNI to use and multiple VNI support, 
>> I lsot track. Sorry. Still, the earlier documents did not specify the 
>> IP to use. That does NOT mean that we are required in later revisions 
>> of the document to allow anything the client wants. Having said that, 
>> we could add text saying that since the IP address in the BFD request 
>> in VNI 0 is effectively meaningless, it can be set to any value on 
>> transmission and must be ignored on reception. As far as I can tell, 
>> it is definitional that the VtEP does not have any assigned IP address 
>> for VNI 0, so we can't expect that address. Yours, Joel On 10/29/2019 
>> 11:10 AM, Anoop Ghanwani wrote:
>>
>>     Hi Joel, Yes, existing implementations use VNI 0 for BFD over
>>     VXLAN. Here are a couple of references:
>>     https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html
>>     
>>     https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665
>>      I guess this document has been evolving and I have not kept up
>>     with it. The version I had reviewed and commented on originally
>>     allowed for VNI 0. The -04 version of the draft has this:
>>     https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7 What
>>     version are you referring to? Thanks, Anoop On Mon, Oct 28, 2019
>>     at 12:55 PM Joel M. Halpern >      > wrote:
>>     You are saying that there are existing implementations using VNI 0
>>     for this? Given that previous versions of the spec explicitly
>>     disallowed VNI 0, I am having trouble with your objecting that a
>>     spec for how to run over VNI 0 breask existing implementations.
>>     Note that when there is a good technical reason, the IETF does
>>     change Internet Drafts in ways that break early implementations. 
>>     That is the price of standardization. Yours, Joel On 10/28/2019
>>     2:30 PM, Anoop Ghanwani wrote: > Hi Joel, > > Writing the spec in
>>     that way would make the current, inter-operable > implementation
>>     of multiple vendors non-compliant with the spec. > > Thanks, >
>>     Anoop > > On Mon, Oct 28, 2019 at 11:07 AM Joel M. Halpern
>>     
>>      > >     >> wrote: > >  I assumed this was
>>     only for the case where a tenant VNI was being used. > >  For
>>     the 0 VNI (which is what I prefer), always (MUST) use the loopback
>>     >  address. There are no addresses assigned to the VTEP in
>>     that space. >  There is no IRB in that space. > >  Yours, > 
>>      Joel > >  On 10/28/2019 1:58 PM, Anoop Ghanwani wrote: >   
>>      > Joel, >   > >   > Are we going to qualify this by VNI? 
>>     There's a bunch of >  implementations >   > out there that
>>     don't use a tenant IP or a loopback with VNI 0--they >   >
>>     simply repeat the underlay IP in the inner IPDA. >   > >   >
>>     Thanks, >   > Anoop >   > >   > On Mon, Oct 28, 2019 at
>>     10:46 AM Joel M. Halpern >  >      
>>     > >   >
>>     
>>     >>> wrote:
>>     >   > >   >  I can live with saying that you SHOULD use
>>     loopback, and MAY >  instead >   >  use >   >  an
>>     IP address in the customer space known to be owned by the VTEP > 
>>       >  device >   >  when such exists. >   > >   > 
>>      Yours, >   >  Joel >   > >   >  On 10/28/2019
>>     1:32 PM, Anoop Ghanwani wrote: >   >   > Hi Joel, >   > 
>>       > >   >   > Perhaps we need to say use of an address
>>     owned by the device >   >  containing >   >   > the
>>     VTEP. >   >   > >   >   > Or are you suggesting that
>>     the use of the loopback address >  space >   >  is a
>>     MUST? >   >   > >   >   > Anoop >   >   > >     
>>     >   > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern >     
>>     >  
>>      >     > >  >      >     >> >   >   >
>>     
>>     > >   
>>     
>>     >>>>
>>     wrote: >   >   > >   >   >  There is something I am
>>     missing in your assumption >  about IRB. >   >   > >     
>>     >   >  As I understand VxLAN, the VTEP is under the control
>>     >  of the >   >  operator. >   >   >  As such,
>>     it is a pure bridge. If you run IRB behind >  it, that >     
>>     >  is fine. >   >   >  Yes, an operator may offer
>>     IRB. But as I understand it, >   >  conceptually, >   > 
>>       >  in terms of the VxLAN architecture the IRB is an entity
>>     >   >  behind the >   >   >  VTEP, >   >   > 
>>      not part of the VTEP. >   >   > >   >   >   
>>     Yours, >   >   >  Joel >   >   > >   >   > 
>>      On 10/28/2019 12:23 PM, Anoop Ghanwani wrote: >   >   > 
>>       > Santosh, >   >   >   > >   >   >   > Does
>>     it have to be a MUST? What if I am running >  IRB and there > 
>>       >   >  are IP >   >   >   > addresses per VNI
>>     assigned to the VTEPs?  Why can the >   >  operator not > 
>>       >   >   > choose to use those? >   >   >   > > 
>>       >   >   > Anoop >   >   >   > >   >   > 
>>       > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K >   >   > 
>>       > >     
>>      >   
>>     >     > >   >   
>>     >      >   
>>     >     >> >   >   >   
>>     >      >   
>>     >     > >   >   
>>     >      >   
>>     >     >>> >   >   >   
>>     >      >   
>>     >     > >   >   
>>     >      >   
>>     >     >> >   >   >   
>>     >      >   
>>     >     > >   >   
>>     >      >   
>>     >     >>>>> wrote: >   >   > 
>>       > >   >   >   >  Dinesh, Anoop et all, >   >   
>>      >   >     Lets us know if this text works for 127/8 > 
>>       >  address range? >   >   >   > >   >   >   
>>      >  [proposed text for firewall] >   >   >   > >     
>>     >   >   >  "As per section 4 inner destination IP address
>>     >  MUST be >   >  set to >   >   >  127/8 >     
>>     >   >   >  address. There may be firewall configured on
>>     >  VTEP to >   >  block 127/8 >   >   >   >   
>>     address range if set as destination IP in inner IP >   >   
>>     header. It is >   >   >   >  recommended to allow
>>     127/8 range address through >   >  firewall only if >     
>>     >   >   >  127/8 IP address is set as destination address
>>     >  in inner IP >   >   >  header." >   >   >   
>>      > >   >   >   > >   >   >   >  In section 4
>>     we are talking about using 127/8 >  and not >   >  really
>>     >   >   >  giving >   >   >   >  reason why.
>>     I think we should have text as RFC 5884 >   >  has mentioned
>>     >   >   >   >  with below text. >   >   >   >
>>     >   >   >   >  [From RFC 5884] >   >   >   > 
>>      "The motivation for using the address range >  127/8 is >   
>>      >  the same as >   >   >   >  specified in
>>     Section2.1 of [RFC4379] >   >   >   > 
>>     . >   >   
>>     This is an >   >   >   >  exception to the behavior
>>     defined in [RFC1122 >   >   >   >   
>>     ]." >   >   >   >
>>     >   >   >   > >   >   >   > >   >   >     
>>     >  Thanks >   >   >   >  Santosh P K >   >     
>>     >   > >   >   >   > >   >   >   > >   >   
>>      >   >  On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt >     
>>     >  
>>      >     > >  >      >     >> >   >   >   
>>     
>>     > >   
>>     
>>     >>> >   >   
>>      >   >  
>>     >  >
>>      >   
>>     >> >   >   
>>     
>>     > >   
>>     
>>     >>>>> wrote: > 
>>       >   >   > >   >   >   >    Looks good to
>>     me Greg. I see that the text >  around >   >  the use > 
>>       >   >  of the >   >   >   >    inner IP
>>     address as also quite acceptable. Will >   >  you add any > 
>>       >   >   >    words about the firewall? >   >   
>>      >   > >   >   >   >    Dinesh >   >   > 
>>       > >   >   >   >    On Wed, Oct 23, 2019 at 8:36
>>     PM, Greg Mirsky >   >   >   >       
>>     
>>      >  >     > >   >   
>>     
>>     >> > 
>>      
>>     > >   
>>      >  >      >     >>> >   >   >   
>>      >   
>>     >
>>      >   
>>     >> > 
>>       >  >      >     > >   
>>     
>>     >>>>>
>>     wrote: >   >   >   >>    Hi Dinesh, et al., >     
>>     >   >   >>    please check the updated version that > 
>>      removed the >   >   >  reference to >   >   >   
>>      >>    Hypervisor in the text and Figure 1. >   >   > 
>>       >> >   >   >   >>    Regards, >   >   >   
>>      >>    Greg >   >   >   >> >   >   >   >> 
>>        On Wed, Oct 23, 2019 at 10:47 AM Santosh P K >   >     
>>     >   >>    >     
>>      >   
>>     >     > >   >   
>>     >      >   
>>     >     >> >   >   >   
>>     >      >   
>>     >     > >   >   
>>     >      >   
>>     >     >>> >   >   >   >> 
>>     >      >   
>>     >     > >   >   
>>     >      >   
>>     >     >> >   >   >   
>>     >      >   
>>     >     > >   >   
>>     >      >   
>>     >     >>>>> wrote: >   >   > 
>>       >> >   >   >   >>      Dinesh, >   >     
>>     >   >>        Please see my inlinecomments [SPK] > 
>>       >   >   >> >   >   >   >> >   >   >     
>>     >>        - In section 3, there's a sentence >  that
>>     >   >  is: "BFD >   >   >   >>               
>>     packets intended for a Hypervisor >  VTEP MUST >   >     
>>     >  NOT..". I >   >   >   >>        recommend
>>     getting rid of the word >   >  "Hypervisor" ashe >   >   
>>      >   >>        logic applies to any VTEP. >   >   
>>      >   >> >   >   >   >>      [SPK] Thanks for
>>     comments. We will >  change this. >   >   >   >> >   
>>      >   >   >>        - You already explained the > 
>>      precedence of >   >  the use of >   >   >   >> 
>>            127/8 address in the inner header in >   >   
>>     MPLS. I have no >   >   >   >>        specific
>>     comments in that area. I have >   >  only two >   >     
>>     >   >>        questions: >   >   >   >>     
>>           - Has anybody verified that the >  use of >     
>>     >  127/8 >   >   >   >>        address (and
>>     the right MAC) works with >   >  existing >   >   >   
>>      >>        implementations, including the silicon >     
>>     >  ones? If this >   >   >   >>               
>>     doesn't work there, is it worth >  adding the >   >   > 
>>      possibilit >   >   >   >>        y of another
>>     address, one that is >  owned >   >  by the >   >     
>>     >  VTEP node? >   >   >   >> >   >   >   >> 
>>             - Do we know if Firewalls stop >  such VXLAN
>>     >   >   >  packets? >   >   >   >>             
>>      I ask this because VXLAN has an IP >  header >   >   
>>     and I >   >   >  don't >   >   >   >>         
>>        know if firewalls stop packets >  with 127/8 >   >   
>>     in the >   >   >  inner >   >   >   >>         
>>        header. If not, is it worth adding a >   >  sentence
>>     to say >   >   >   >>        that firewalls
>>     allow such >  packets? The >   >  use of a >   >     
>>     >   >>        non-127/8 address may alleviate >   
>>     this case >   >  as well. >   >   >   >> >   > 
>>       >   >>      [SPK] I think we may need to add the
>>     text >   >  about firewall >   >   >   >>         
>>      as some checks in firewall will be >  there if >   >   
>>     they are not >   >   >   >>      already using
>>     MPLS OAM which has inner IP >   >  header with >   >     
>>     >   >>      127/8 address range. >   >   >   >>
>>     >   >   >   >> >   >   >   >>               
>>     The rest of the draft looks good >  to me, >   >   >   
>>      >> >   >   >   >>        Dinesh >   >     
>>     >   >> >   >   >   >>        On Wed, Oct 23,
>>     2019 at 7:58 AM, >  Greg Mirsky >   >   >   >>       
>>         
>>      >  >     > >   >   
>>     
>>     >> > 
>>       >   >  >      >  >     > >      >  >     >>> >   >   
>>     
>>     > >   
>>     
>>     >> > 
>>       >   >  >      >  >     > >      >  >     >>>>> >   >   >   >>       
>>         wrote: >   >   >   >>>        Hi
>>     Dinesh, >   >   >   >>>        I greatly
>>     appreciate your comments. >   >  Please heave a >   >   
>>      >   >>>        look at the attached copy of the >   
>>     working >   >   >  version and >   >   >   >>> 
>>            its diff to -07 (latest in the >  datatracker).
>>     >   >   >   >>> >   >   >   >>>               
>>     Regards, >   >   >   >>>        Greg >   > 
>>       >   >>> >   >   >   >>>        On Tue,
>>     Oct 22, 2019 at 9:52 PM >  Dinesh Dutt >   >   >     
>>     >>>        
>>      >  >     > >   >  >      >     >> >  >      >     > >   >  >      >     >>> >   >   >   
>>     
>>     > >   
>>     
>>     >> >   >   
>>     
>>     > >   
>>     
>>     >>>>> wrote: > 
>>       >   >   >>> >   >   >   >>>                   
>>     I have the same feeling as Anoop. >   >  Greg, can you >   
>>      >   >   >>>          please point me to the
>>     latest >  draft >   >  so that >   >   >  I can
>>     >   >   >   >>>          quickly glance
>>     through it to be >   >  doubly sure, >   >   >     
>>     >>> >   >   >   >>>          Dinesh >   > 
>>       >   >>> >   >   >   >>>          On
>>     Wed, Oct 23, 2019 at 4:35 AM, >   >  Anoop Ghanwani >     
>>     >   >   >>>          >       >   
>>     > > 
>>       >  >      >     >> >   >   >   
>>      >   
>>     >
>>      >   
>>     >>>
>>     >   >   >   >>>  >      >  >     > >   >   
>>     
>>     >> > 
>>       >   >  >      >  >     > >   >   
>>      >   
>>     >>>>>
>>     wrote: >   >   >   >>>>          Greg, >     
>>     >   >   >>>> >   >   >   >>>>          I
>>     think the draft is fine as is. >   >   >   >>>> >   > 
>>       >   >>>>          I discussion with Xiao Min was
>>     >   >  about #3 and I >   >   >   >>>>             
>>        see that as unnecessary until we >   >  have a draft
>>     >   >   >   >>>>          that explains why
>>     that is >  needed in the >   >   >  context >   > 
>>       >   >>>>          of the NVO3 architecture. >   
>>      >   >   >>>> >   >   >   >>>>                   
>>     Anoop >   >   >   >>>> >   >   >   >>>>       
>>           On Tue, Oct 22, 2019 at 11:17 AM >   >  Greg
>>     Mirsky >   >   >   >>>>  >       >   
>>     > > 
>>       >  >      >     >> >   >   >   
>>      >   
>>     >
>>      >   
>>     >>>
>>     >   >   >   >>>> >   >      >     > >   >   
>>     
>>     >> > 
>>       >   >  >      >  >     > >   >   
>>      >   
>>     >>>>>
>>     wrote: >   >   >   >>>> >   >   >   >>>>       
>>             Hi Anoop, et al., >   >   >   >>>>     
>>              I agree with your >  understanding >   > 
>>      of what is >   >   >   >>>>                       
>>     being defined in the current >   >  version >   >     
>>     >  of the >   >   >   >>>>            BFD
>>     over VxLAN >  specification. >   >  But, as I >   >   
>>      >   >>>>            understand, the WG is >     
>>     >  discussing the scope >   >   >   >>>>             
>>          before the WGLC is closed. I >   >  believe there
>>     >   >   >   >>>>            are three
>>     options: >   >   >   >>>> >   >   >   >>>>     
>>               1. single BFD session >  between >   > 
>>      two VTEPs >   >   >   >>>>             2.
>>     single BFD session >  per VNI >   >  between >   >   
>>      >  two VTEPs >   >   >   >>>>                       
>>      3. multiple BFD >  sessions per >   >  VNI between >   
>>      >   >   >>>>              two VTEPs >     
>>     >   >   >>>> >   >   >   >>>>                     
>>      The current text >  reflects #2. Is WG >   >   >   
>>     accepts >   >   >   >>>>            this
>>     scope? If not, which >   >  option WG would >   >   > 
>>       >>>>            accept? >   >   >   >>>>
>>     >   >   >   >>>>            Regards, >     
>>     >   >   >>>>            Greg >   >   >   
>>      >>>> >   >   >   >>>>            On Tue,
>>     Oct 22, 2019 at >  2:09 PM >   >  Anoop >   >   > 
>>       >>>>            Ghanwani >   
>>     
>>      >     > >   >   
>>     
>>     >> > 
>>       >   >  >      >  >     > >      >  >     >>> >   >   >   >>>> >     
>>     
>>     > >   
>>      >  >      >     >> >   >   >   
>>      >   
>>     > > 
>>       >  >      >  >     >>>>> wrote: >   >   >     
>>     >>>> >   >   >   >>>>              I
>>     concur with Joel's >  assessment >   >   >  with the
>>     >   >   >   >>>>              following > 
>>      clarifications. >   >   >   >>>> >   >   >     
>>     >>>>              The current document >  is
>>     already >   >   >  capable >   >   >   >>>>     
>>                of monitoring >  multiple VNIs >   > 
>>       >  between VTEPs. >   >   >   >>>> >   >     
>>     >   >>>>              The issue under >   
>>     discussion >   >  was how >   >   >  do we >     
>>     >   >   >>>>              use BFD to monitor
>>     >  multiple >   >  VAPs that >   >   >   >>>>   
>>                 use the same VNI >  between a >     
>>     >  pair of >   >   >   >>>>                           
>>     VTEPs. The use case for >   >  this is not >   >     
>>     >   >>>>              clear to me, as from my > 
>>       >  understanding, >   >   >   >>>>               
>>           we cannot have a >  situation with >   >     
>>     >  multiple >   >   >   >>>>                         
>>      VAPs using the same >   >  VNI--there is 1:1 >   >   
>>      >   >>>>              mapping between VAP >   
>>     and VNI. >   >   >   >>>> >   >   >   >>>>     
>>                Anoop >   >   >   >>>> >   >   
>>      >   >>>>              On Tue, Oct 22, 2019 > 
>>      at 6:06 AM >   >   >  Joel M. >   >   >     
>>     >>>>              Halpern >   >   
>>     
>>      >     > >  >      >     >> >   >   >   
>>      >   
>>     >
>>      >   
>>     >>> >   
>>      >   >   >>>> >   >      >     > >   >   
>>     
>>     >> >     
>>     >   >  >      >  >     > >      >  >     >>>>> >   >  wrote: >   >   
>>      >   >>>> >   >   >   >>>>                           
>>       From what I can >  tell, >   >  there >   >     
>>     >  are two >   >   >   >>>>                           
>>       separate problems. >   >   >   >>>>                 
>>            The document we >  have is a >   >   >   
>>     VTEP-VTEP >   >   >   >>>>                             
>>      monitoring >  document. >   >  There is no >   >   
>>      >   >>>>                need for that >   
>>     document to >   >   >  handle the >   >   >     
>>     >>>>                multiple VNI case. >   > 
>>       >   >>>>                If folks want a > 
>>       >  protocol for doing >   >   >   >>>>           
>>               BFD monitoring >  of things >   >     
>>     >  behind the >   >   >   >>>>                       
>>         VTEPs (multiple >  VNIs), >   >  then do >     
>>     >   >  that >   >   >   >>>>                       
>>         as a separate >   >  document. The >   >     
>>     >   >>>>                encoding will be >   
>>     a tenant >   >   >  encoding, >   >   >   >>>> 
>>                    and thus >  sesparate from >   
>>      >  what is >   >   >   >>>>                         
>>        defined in this >  document. >   >   >   >>>>
>>     >   >   >   >>>>                Yours,
>>     >   >   >   >>>>                Joel > 
>>       >   >   >>>> >   >   >   >>>>                 
>>            On 10/21/2019 >  5:07 PM, >   >  Jeffrey
>>     >   >   >  Haas >   >   >   >>>>               
>>             wrote: >   >   >   >>>>                 
>>            > Santosh and >  others, >   >   >     
>>     >>>>                > >   >   >   >>>> 
>>                    > On Thu, Oct >  03, 2019 at > 
>>       >   >  07:50:20PM >   >   >   >>>>             
>>              +0530, Santosh P >  K wrote: >   >     
>>     >   >>>>                >>  Thanks >   
>>     for your >   >   >  explanation. >   >   >     
>>     >>>>                This helps a lot. I >   > 
>>      would wait >   >   >  for more >   >   >     
>>     >>>>                >> comments from >  others
>>     >   >  to see if >   >   >   >>>>                 
>>            this what we >  need in this >   >   >   
>>     draft to be >   >   >   >>>>                           
>>       >> supported >  based on >   >  that we can >     
>>     >   >   >>>>                provide
>>     appropriate >   >  sections >   >   >  in the >   
>>      >   >   >>>>                draft. >     
>>     >   >   >>>>                > >   >     
>>     >   >>>>                > The threads on the
>>     >   >  list have >   >   >   >>>>                 
>>            spidered to the >  point >   >  where it
>>     is >   >   >   >>>>                               
>>     challenging >   >   >   >>>>                           
>>       > to follow what the >   >  current >   >   >   
>>     status >   >   >   >>>>                               
>>     of the draft is, >  or should >   >   >  be. :-) > 
>>       >   >   >>>>                > >   > 
>>       >   >>>>                > However, if I've
>>     >   >  followed things >   >   >   >>>>           
>>               properly, the >  question >   >   
>>     below is >   >   >   >>>>                               
>>     really the >   >   >   >>>>                             
>>      > hinge point on >  what our >   >   >   >>>>     
>>                  encapsulation >  for BFD >   >   
>>     over vxlan >   >   >   >>>>                             
>>      should look like. >   >   >   >>>>                   
>>           > Correct? >   >   >   >>>>                 
>>            > >   >   >   >>>>                       
>>         > Essentially, >  do we or >   >  do we not >   
>>      >   >   >>>>                require the
>>     >  ability to >   >  permit >   >   >   >>>>   
>>                   multiple BFD >   >   >     
>>     >>>>                > sessions between >   > 
>>      distinct VAPs? >   >   >   >>>>                       
>>         > >   >   >   >>>>                             
>>      > If this is so, >  do we >   >  have a >   >     
>>     >  sense >   >   >   >>>>                             
>>      as to how we should >   >  proceed? >   >   >     
>>     >>>>                > >   >   >   >>>> 
>>                    > -- Jeff >   >   >     
>>     >>>>                > >   >   >   >>>> 
>>                    > [context preserved >   >   
>>     below...] >   >   >   >>>>                             
>>      > >   >   >   >>>>                >>
>>     Santosh P K >   >   >   >>>>                             
>>      >> >   >   >   >>>>                >>
>>     On Wed, Sep >  25, 2019 >   >  at 8:10 AM >   >     
>>     >   >>>> >   >      
>>     > >     
>>     >  
>>     >> >   
>>      >   >  >      >  >     > >      >  >     >>> >   >   >   >>>> >     
>>     >   
>>     > >   
>>     
>>     >> >   
>>      >   >  >      >  >     > >      >  >     >>>>> >   >  wrote: >   >   
>>      >   >>>>                >> >   >   > 
>>       >>>>                >>> Hi Santosh, >   > 
>>       >   >>>>                >>> >   >     
>>     >   >>>>                >>> >   >   >   
>>      >>>>                >>> With regard >  to
>>     the >   >  question >   >   >   >>>>               
>>             whether we >  should allow >   >   >   
>>     multiple BFD >   >   >   >>>>                           
>>       sessions >   >   >   >>>>                           
>>       >>> for the same >  VNI or >   >  not, >   >     
>>     >  IMHO we >   >   >   >>>>                           
>>       should allow it, >  more >   >   >  explanation
>>     as >   >   >   >>>>                >>>
>>     follows. >   >   >   >>>>                               
>>     >>> >   >   >   >>>>                >>>
>>     Below is a >  figure >   >  derived from >   >   > 
>>       >>>>                figure 2 of >  RFC8014
>>     (An >   >   >  Architecture for >   >   >     
>>     >>>>                >>> Data-Center >  Network
>>     >   >   >   >>>>  Virtualization >  over Layer 3 > 
>>       >   >  (NVO3)). >   >   >   >>>>               
>>             >>> >   >   >   >>>>                   
>>           >>> >       | >   >   >   >>>>       
>>                 Data Center Network >   >  (IP)   
>>       | >   >   >   >>>>                               
>>     >>> >       | >   >   >   >>>> >   >         
>>      | >   >   >   >>>>                >>>
>>     >   >   >   >>>> >   >   >     
>>     +-----------------------------------------+ >   >   >     
>>     >>>>                >>> >   >      | > 
>>       >   >   >>>> >     | >   >   >   >>>>   
>>                   >>> >   >      | >   > 
>>       >   >>>>                Tunnel Overlay > 
>>         | >   >   >   >>>>                               
>>     >>> >   >   >   >>>> >   +------------+---------+ > 
>>       >   >   >>>> >   +---------+------------+ >   > 
>>       >   >>>>                >>>      | > 
>>       >   >   >>>> >   +----------+-------+ | >   >   
>>        | >   >   >   >>>> >   +-------+----------+ |
>>     >   >   >   >>>>                >>> >   
>>     | | >   >  Overlay >   >   >   >>>>               
>>             Module | | >   | | >   >  Overlay >   
>>      >   >   >>>>                Module | |
>>     >   >   >   >>>>                >>>   
>>        | >   >   >   >>>> >   +---------+--------+ |
>>     >   >     | >   >   >   >>>> >     
>>     +---------+--------+ | >   >   >   >>>>                 
>>            >>>      | >   >     | >   >     
>>     >   >>>>                  |   | >       
>>       | >   >   >     | >   >   >   >>>>       
>>                 >>>  NVE1 | >   >     | >   
>>      >   >   >>>>                  |   |
>>     >      | >   >   >     | >   >   >     
>>     >>>>                NVE2 >   >   >     
>>     >>>>                >>>      | >   >     
>>     >   >>>> >   +--------+-------+ | >   >     | > 
>>       >   >   >>>> >   +--------+-------+ | >   >     
>>     >   >>>>                >>> >  | |VNI1 > 
>>       >   >  VNI2 VNI1 >   >   >   >>>>             
>>              | |  | | VNI1 >   >  VNI2 VNI1 >     
>>     >   >  | | >   >   >   >>>>                       
>>         >>>      | >   >   >   >>>> >     
>>     +-+-----+----+---+ | >   >     | >   >   >     
>>     >>>> >   +-+-----+-----+--+ | >   >   >   >>>>     
>>                  >>> >  |VAP1| >   >  VAP2|   
>>     | >   >   >   >>>>                VAP3 |
>>     >   |VAP1| VAP2| >   >   >   | VAP3| >   >     
>>     >   >>>>                >>> >   >   >   
>>      >>>> >   +----+-----+----+------+ >   >   >   >>>>
>>     >   +----+-----+-----+-----+ >   >   >   >>>>       
>>                 >>> >   >   |  | >   >     
>>     >    | >   >   >   >>>>     | >   >   | 
>>      | >   >   >   >>>>                >>>
>>     >   >   |  | >   >   >    | >   >   >   
>>      >>>>     | >   >   |  | >   >   >     
>>     >>>>                >>> >   >   |  | > 
>>       >   >    | >   >   >   >>>>     | >     
>>     >   |  | >   >   >   >>>>                         
>>        >>> >   >   >   >>>> >   >   > >     
>>     -------+-----+----+-------------------+-----+-----+------- >     
>>     >   >   >>>>                >>> >   >   
>>      |  | >   >   >    | >   >   >   >>>> 
>>     Tenant    | >   >   |  | >   >   >   >>>> 
>>                    >>> >  TSI1 | >   >   
>>     TSI2|  | >   >   >   >>>>                             
>>      TSI3 >  TSI1| TSI2| >   >   >   |TSI3 >   >   
>>      >   >>>>                >>> >   >   
>>     +---+ +---+ >   >   >   >>>>                           
>>       +---+ >   +---+ >   >  +---+ >   >   >     
>>     +---+ >   >   >   >>>>                               
>>     >>> >   >  |TS1| |TS2| >   >   >   >>>>           
>>               |TS3| >   |TS4| >   >  |TS5| >     
>>     >   >   |TS6| >   >   >   >>>>                   
>>           >>> >   >  +---+ +---+ >   >   >     
>>     >>>>                +---+ >   +---+ >   > 
>>      +---+ >   >   >   +---+ >   >   >   >>>>   
>>                   >>> >   >   >   >>>>       
>>                 >>> To my >   >  understanding, the
>>     BFD >   >   >   >>>>                               
>>     sessions between >  NVE1 >   >  and NVE2 are >   >   
>>      >   >>>>                actually >   >   
>>      >   >>>>                >>> initiated and > 
>>       >  terminated >   >   >  at VAP >   >   >   
>>      >>>>                of NVE. >   >   >   
>>      >>>>                >>> >   >   >     
>>     >>>>                >>> If the >  network
>>     operator >   >   >  want to >   >   >   >>>>   
>>                   set up one BFD >  session >     
>>     >  between >   >   >  VAP1 of >   >   >     
>>     >>>>                >>> NVE1 and VAP1of >   > 
>>      NVE2, at the >   >   >   >>>>                         
>>        same time >  another BFD >   >  session >   > 
>>       >   >>>>                between VAP3 of > 
>>       >   >   >>>>                >>> NVE1
>>     and >  VAP3 of NVE2, >   >   >  although >   >     
>>     >   >>>>                the two BFD sessions
>>     >   >  are for >   >   >  the same >   >   > 
>>       >>>>                >>> VNI1, I >  believe
>>     it's >   >   >  reasonable, >   >   >   >>>>   
>>                   so that's why I >  think we >     
>>     >   >  should allow it >   >   >   >>>> >   >   
>>      >   >>>> >   >   >     
>>     _______________________________________________ >   >   > 
>>       >>>>                nvo3 mailing list >     
>>     >   >   >>>> nvo3@ietf.org 
>>      >     > >  >      >     >> >   >  >      >     > >  >      >     >>> >      >  >     > >   >  >      >     >> >   >   >  >      >     > >  >      >     >>>> >   >   >   >>>>
>>     https://www.ietf.org/mailman/listinfo/nvo3 >   >   >     
>>     >>>> >   >   > >   > > 


From nobody Wed Oct 30 04:23:02 2019
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From: Anoop Ghanwani 
Date: Tue, 29 Oct 2019 21:56:12 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Dinesh Dutt 
Cc: "Joel M. Halpern" , Santosh P K ,  Greg Mirsky , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Dinesh,

What would break?  If messages are trapped to CPU based on the MAC DA, what
is the problem?

On the flip side, there are implementations running BFD today which use
different addresses as specified here:
http://www.openvswitch.org/support/dist-docs/vtep.5.html
>>>

       *b**f**d**_**c**o**n**f**i**g**_**l**o**c**a**l* *:*
*b**f**d**_**d**s**t**_**i**p*: optional string
              Set to an IPv4 address to set the IP address that is expected as
              destination   for   received   BFD   packets.   The  default  is
              *1**6**9**.**2**5**4**.**1**.**0*.

>>>

Thanks,
Anoop

On Tue, Oct 29, 2019 at 7:01 PM Dinesh Dutt  wrote:

> I suspect silicon implementations will have a problem with saying that
> they can be set to anything and MUST be ignored on reception. Your logic is
> sound, it's just that I fear you'll break many existing implementations. I
> recommend sticking with the 127/8 address for this case.
>
> Dinesh
>
> On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern 
> wrote:
>
> In all the discussion about what VNI to use and multiple VNI support, I
> lsot track. Sorry. Still, the earlier documents did not specify the IP to
> use. That does NOT mean that we are required in later revisions of the
> document to allow anything the client wants. Having said that, we could add
> text saying that since the IP address in the BFD request in VNI 0 is
> effectively meaningless, it can be set to any value on transmission and
> must be ignored on reception. As far as I can tell, it is definitional that
> the VtEP does not have any assigned IP address for VNI 0, so we can't
> expect that address. Yours, Joel On 10/29/2019 11:10 AM, Anoop Ghanwani
> wrote:
>
> Hi Joel, Yes, existing implementations use VNI 0 for BFD over VXLAN.  Here
> are a couple of references:
> https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html
> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665
> I guess this document has been evolving and I have not kept up with it. The
> version I had reviewed and commented on originally allowed for VNI 0.  The
> -04 version of the draft has this:
> https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7 What
> version are you referring to? Thanks, Anoop On Mon, Oct 28, 2019 at 12:55
> PM Joel M. Halpern  >> wrote: You are saying that there are existing
> implementations using VNI 0 for this?  Given that previous versions of the
> spec explicitly disallowed VNI 0, I am having trouble with your objecting
> that a spec for how to run over VNI 0 breask existing implementations. Note
> that when there is a good technical reason, the IETF does change Internet
> Drafts in ways that break early implementations.  That is the price of
> standardization. Yours, Joel On 10/28/2019 2:30 PM, Anoop Ghanwani wrote: >
> Hi Joel, > > Writing the spec in that way would make the current,
> inter-operable > implementation of multiple vendors non-compliant with the
> spec. > > Thanks, > Anoop > > On Mon, Oct 28, 2019 at 11:07 AM Joel M.
> Halpern  > > 
> >>> wrote: > >     I
> assumed this was only for the case where a tenant VNI was being used. > >
>    For the 0 VNI (which is what I prefer), always (MUST) use the loopback
> >     address.  There are no addresses assigned to the VTEP in that space.
> >     There is no IRB in that space. > >     Yours, >     Joel > >     On
> 10/28/2019 1:58 PM, Anoop Ghanwani wrote: >      > Joel, >      > >      >
> Are we going to qualify this by VNI?  There's a bunch of >
>  implementations >      > out there that don't use a tenant IP or a
> loopback with VNI 0--they >      > simply repeat the underlay IP in the
> inner IPDA. >      > >      > Thanks, >      > Anoop >      > >      > On
> Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern >      mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> >      > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>>> wrote: >      > >
>   >     I can live with saying that you SHOULD use loopback, and MAY >
>  instead >      >     use >      >     an IP address in the customer space
> known to be owned by the VTEP >      >     device >      >     when such
> exists. >      > >      >     Yours, >      >     Joel >      > >      >
>  On 10/28/2019 1:32 PM, Anoop Ghanwani wrote: >      >      > Hi Joel, >
>   >      > >      >      > Perhaps we need to say use of an address owned
> by the device >      >     containing >      >      > the VTEP. >      >
>   > >      >      > Or are you suggesting that the use of the loopback
> address >     space >      >     is a MUST? >      >      > >      >      >
> Anoop >      >      > >      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel
> M. Halpern >      >      >  <
> mailto:jmh@joelhalpern.com >> >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>> >      >      > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>>>> wrote: >      >
>   > >      >      >     There is something I am missing in your assumption
> >     about IRB. >      >      > >      >      >     As I understand VxLAN,
> the VTEP is under the control >     of the >      >     operator. >      >
>     >     As such, it is a pure bridge.  If you run IRB behind >     it,
> that >      >     is fine. >      >      >     Yes, an operator may offer
> IRB.  But as I understand it, >      >     conceptually, >      >      >
>  in terms of the VxLAN architecture the IRB is an entity >      >
>  behind the >      >      >     VTEP, >      >      >     not part of the
> VTEP. >      >      > >      >      >     Yours, >      >      >     Joel
> >      >      > >      >      >     On 10/28/2019 12:23 PM, Anoop Ghanwani
> wrote: >      >      >      > Santosh, >      >      >      > >      >
> >      > Does it have to be a MUST?  What if I am running >     IRB and
> there >      >      >     are IP >      >      >      > addresses per VNI
> assigned to the VTEPs? Why can the >      >     operator not >      >
> >      > choose to use those? >      >      >      > >      >      >      >
> Anoop >      >      >      > >      >      >      > On Mon, Oct 28, 2019 at
> 7:51 AM Santosh P K >      >      >      >  mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>> >      >      >     <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>>> >      >      >     <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>> >      >      >     <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>>>>> wrote: >      >      >      > >
> >      >      >     Dinesh, Anoop et all, >      >      >      >
>  Lets us know if this text works for 127/8 >      >     address range? >
>   >      >      > >      >      >      >     [proposed text for firewall]
> >      >      >      > >      >      >      >     "As per section 4 inner
> destination IP address >     MUST be >      >     set to >      >      >
>  127/8 >      >      >      >     address. There may be firewall configured
> on >     VTEP to >      >     block 127/8 >      >      >      >
>  address range if set as destination IP in inner IP >      >     header. It
> is >      >      >      >     recommended to allow 127/8 range address
> through >      >     firewall only if >      >      >      >     127/8 IP
> address is set as destination address >     in inner IP >      >      >
>  header." >      >      >      > >      >      >      > >      >      >
>   >     In section 4 we are talking about using 127/8 >     and not >
> >     really >      >      >     giving >      >      >      >     reason
> why. I think we should have text as RFC 5884 >      >     has mentioned >
>     >      >      >     with below text. >      >      >      > >      >
>   >      >     [From RFC 5884] >      >      >      >     "The motivation
> for using the address range >     127/8 is >      >     the same as >
> >      >      >     specified in Section 2.1 of [RFC4379] >      >      >
>     >  . >      >
>  This is an >      >      >      >     exception to the behavior defined in
> [RFC1122 >      >      >      >     ]."
> >      >      >      > >      >      >      > >      >      >      > >
> >      >      >     Thanks >      >      >      >     Santosh P K >      >
>     >      > >      >      >      > >      >      >      > >      >      >
>     >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt >      >     <
> didutt@gmail.com > <
> mailto:didutt@gmail.com   >> >      <
> mailto:didutt@gmail.com >   >>> >
> >      >      <
> mailto:didutt@gmail.com >   >> >     <
> mailto:didutt@gmail.com   >  <
> mailto:didutt@gmail.com >>>> >      >      >      >
>    > >      <
> mailto:didutt@gmail.com >>   > >     <
> mailto:didutt@gmail.com   >>> >      >       > <
> mailto:didutt@gmail.com   >> >      <
> mailto:didutt@gmail.com >   >>>>>>
> wrote: >      >      >      > >      >      >      >         Looks good to
> me Greg. I see that the text >     around >      >     the use >      >
>   >     of the >      >      >      >         inner IP address as also
> quite acceptable. Will >      >     you add any >      >      >      >
>    words about the firewall? >      >      >      > >      >      >      >
>        Dinesh >      >      >      > >      >      >      >         On Wed,
> Oct 23, 2019 at 8:36 PM, Greg Mirsky >      >      >      >         <
> gregimirsky@gmail.com  > >        >> >      >        >    >>> >        >    >> >      >        >    >>>> >      >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>> >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>>>>> wrote: >
> >      >      >>         Hi Dinesh, et al., >      >      >      >>
>  please check the updated version that >     removed the >      >      >
>  reference to >      >      >      >>         Hypervisor in the text and
> Figure 1. >      >      >      >> >      >      >      >>         Regards,
> >      >      >      >>         Greg >      >      >      >> >      >
> >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K >      >
>   >      >>          mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>> >      >      >     <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>>> >      >      >      >>  <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>> >      >      >     <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>>>>> wrote: >      >      >      >> >
>   >      >      >>             Dinesh, >      >      >      >>
>       Please see my inline comments [SPK] >      >      >      >> >      >
>     >      >> >      >      >      >>                 - In section 3,
> there's a sentence >     that >      >     is: "BFD >      >      >
> >>                 packets intended for a Hypervisor >     VTEP MUST >
> >      >     NOT..". I >      >      >      >>                 recommend
> getting rid of the word >      >     "Hypervisor" ashe >      >      >
> >>                 logic applies to any VTEP. >      >      >      >> >
>   >      >      >>             [SPK] Thanks for comments. We will >
>  change this. >      >      >      >> >      >      >      >>
>    - You already explained the >     precedence of >      >     the use of
> >      >      >      >>                 127/8 address in the inner header
> in >      >     MPLS. I have no >      >      >      >>
>  specific comments in that area. I have >      >     only two >      >
> >      >>                 questions: >      >      >      >>
>     - Has anybody verified that the >     use of >      >     127/8 >
> >      >      >>                 address (and the right MAC) works with >
>     >     existing >      >      >      >>                 implementations,
> including the silicon >      >     ones? If this >      >      >      >>
>              doesn't work there, is it worth >     adding the >      >
> >     possibilit >      >      >      >>                 y of another
> address, one that is >     owned >      >     by the >      >      >
>  VTEP node? >      >      >      >> >      >      >      >>
>     - Do we know if Firewalls stop >     such VXLAN >      >      >
>  packets? >      >      >      >>                 I ask this because VXLAN
> has an IP >     header >      >     and I >      >      >     don't >
> >      >      >>                 know if firewalls stop packets >     with
> 127/8 >      >     in the >      >      >     inner >      >      >
> >>                 header. If not, is it worth adding a >      >
>  sentence to say >      >      >      >>                 that firewalls
>  allow such >     packets? The >      >     use of a >      >      >
> >>                 non-127/8 address may alleviate >     this case >
> >     as well. >      >      >      >> >      >      >      >>
>  [SPK] I think we may need to add the text >      >     about firewall >
>   >      >      >>             as some checks in firewall will be >
>  there if >      >     they are not >      >      >      >>
>  already using MPLS OAM which has inner IP >      >     header with >
> >      >      >>             127/8 address range. >      >      >      >>
> >      >      >      >> >      >      >      >>                 The rest of
> the draft looks good >     to me, >      >      >      >> >      >      >
>     >>                 Dinesh >      >      >      >> >      >      >
> >>                 On Wed, Oct 23, 2019 at 7:58 AM, >     Greg Mirsky >
>   >      >      >>                  mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>> >      >      >
>     <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>>> >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>> >      >      >
>     <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>>>>> >      >
> >      >>                 wrote: >      >      >      >>>
>  Hi Dinesh, >      >      >      >>>                 I greatly appreciate
> your comments. >      >     Please heave a >      >      >      >>>
>          look at the attached copy of the >     working >      >      >
>  version and >      >      >      >>>                 its diff to -07
> (latest in the >     datatracker). >      >      >      >>> >      >
> >      >>>                 Regards, >      >      >      >>>
>  Greg >      >      >      >>> >      >      >      >>>                 On
> Tue, Oct 22, 2019 at 9:52 PM >     Dinesh Dutt >      >      >      >>>
>              >
> >       >> >      >       > <
> mailto:didutt@gmail.com   >>> >      <
> mailto:didutt@gmail.com >   >> >
> >       >  <
> mailto:didutt@gmail.com >>>> >      >      >     <
> mailto:didutt@gmail.com   >  <
> mailto:didutt@gmail.com >> >     <
> mailto:didutt@gmail.com   >  <
> mailto:didutt@gmail.com >>> >      >     <
> mailto:didutt@gmail.com   >  <
> mailto:didutt@gmail.com >> >     <
> mailto:didutt@gmail.com   >  <
> mailto:didutt@gmail.com >>>>>> wrote: >      >      >
>     >>> >      >      >      >>>                     I have the same
> feeling as Anoop. >      >     Greg, can you >      >      >      >>>
>                please point me to the latest >     draft >      >     so
> that >      >      >     I can >      >      >      >>>
>  quickly glance through it to be >      >     doubly sure, >      >      >
>     >>> >      >      >      >>>                     Dinesh >      >
> >      >>> >      >      >      >>>                     On Wed, Oct 23,
> 2019 at 4:35 AM, >      >     Anoop Ghanwani >      >      >      >>>
>                 > >        >> >      >        >    >>> >      >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>>> >      >      >
>     >>>   <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>> >      >      >
>     <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
> >      >      >>>>                     Greg, >      >      >      >>>> >
>   >      >      >>>>                     I think the draft is fine as is.
> >      >      >      >>>> >      >      >      >>>>                     I
> discussion with Xiao Min was >      >     about #3 and I >      >      >
>   >>>>                     see that as unnecessary until we >      >
>  have a draft >      >      >      >>>>                     that explains
> why that is >     needed in the >      >      >     context >      >
> >      >>>>                     of the NVO3 architecture. >      >      >
>     >>>> >      >      >      >>>>                     Anoop >      >
> >      >>>> >      >      >      >>>>                     On Tue, Oct 22,
> 2019 at 11:17 AM >      >     Greg Mirsky >      >      >      >>>>  <
> gregimirsky@gmail.com  > >        >> >      >        >    >>> >      >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>>> >      >      >
>     >>>> >        <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>> >      >      >
>     <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>>>>> wrote: >
> >      >      >>>> >      >      >      >>>>                         Hi
> Anoop, et al., >      >      >      >>>>                         I agree
> with your >     understanding >      >     of what is >      >      >
> >>>>                         being defined in the current >      >
>  version >      >      >     of the >      >      >      >>>>
>            BFD over VxLAN >     specification. >      >     But, as I >
>   >      >      >>>>                         understand, the WG is >
> >     discussing the scope >      >      >      >>>>
>  before the WGLC is closed. I >      >     believe there >      >      >
>   >>>>                         are three options: >      >      >      >>>>
> >      >      >      >>>>                          1. single BFD session >
>    between >      >     two VTEPs >      >      >      >>>>
>           2. single BFD session >     per VNI >      >     between >
> >      >     two VTEPs >      >      >      >>>>
> 3. multiple BFD >     sessions per >      >     VNI between >      >
> >      >>>>                             two VTEPs >      >      >      >>>>
> >      >      >      >>>>                         The current text >
>  reflects #2. Is WG >      >      >     accepts >      >      >      >>>>
>                        this scope? If not, which >      >     option WG
> would >      >      >      >>>>                         accept? >      >
>   >      >>>> >      >      >      >>>>                         Regards, >
>     >      >      >>>>                         Greg >      >      >
> >>>> >      >      >      >>>>                         On Tue, Oct 22, 2019
> at >     2:09 PM >      >     Anoop >      >      >      >>>>
>            Ghanwani >      mailto:anoop@alumni.duke.edu > <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>> >      >      >
>     <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>>> >      >      >
>     >>>> >        <
> mailto:anoop@alumni.duke.edu > <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>> >      >      >
>     <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
> >      >      >>>> >      >      >      >>>>                             I
> concur with Joel's >     assessment >      >      >     with the >      >
>     >      >>>>                             following >     clarifications.
> >      >      >      >>>> >      >      >      >>>>
>      The current document >     is already >      >      >     capable >
>   >      >      >>>>                             of monitoring >
>  multiple VNIs >      >      >     between VTEPs. >      >      >      >>>>
> >      >      >      >>>>                             The issue under >
>  discussion >      >     was how >      >      >     do we >      >      >
>     >>>>                             use BFD to monitor >     multiple >
>   >     VAPs that >      >      >      >>>>                             use
> the same VNI >     between a >      >     pair of >      >      >
> >>>>                             VTEPs.  The use case for >      >     this
> is not >      >      >      >>>>                             clear to me,
> as from my >      >     understanding, >      >      >      >>>>
>                  we cannot have a >     situation with >      >      >
>  multiple >      >      >      >>>>                             VAPs using
> the same >      >     VNI--there is 1:1 >      >      >      >>>>
>                    mapping between VAP >     and VNI. >      >      >
> >>>> >      >      >      >>>>                             Anoop >      >
>     >      >>>> >      >      >      >>>>                             On
> Tue, Oct 22, 2019 >     at 6:06 AM >      >      >     Joel M. >      >
>   >      >>>>                             Halpern >      >     <
> jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>> >      >      >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>>> >      >      >
> >>>> >        <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> >      >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>> >      >      >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>>>>> >      >
>  wrote: >      >      >      >>>> >      >      >      >>>>
>                   From what I can >     tell, >      >     there >      >
>     >     are two >      >      >      >>>>
>  separate problems. >      >      >      >>>>
>    The document we >     have is a >      >      >     VTEP-VTEP >      >
>     >      >>>>                                 monitoring >     document.
> >      >     There is no >      >      >      >>>>
>        need for that >     document to >      >      >     handle the >
>   >      >      >>>>                                 multiple VNI case. >
>     >      >      >>>>                                 If folks want a >
>   >     protocol for doing >      >      >      >>>>
>          BFD monitoring >     of things >      >      >     behind the >
>   >      >      >>>>                                 VTEPs (multiple >
>  VNIs), >      >     then do >      >      >     that >      >      >
> >>>>                                 as a separate >      >     document.
>  The >      >      >      >>>>                                 encoding
> will be >     a tenant >      >      >     encoding, >      >      >
> >>>>                                 and thus >     sesparate from >
> >     what is >      >      >      >>>>
>  defined in this >     document. >      >      >      >>>> >      >      >
>     >>>>                                 Yours, >      >      >      >>>>
>                                Joel >      >      >      >>>> >      >
> >      >>>>                                 On 10/21/2019 >     5:07 PM, >
>     >     Jeffrey >      >      >     Haas >      >      >      >>>>
>                          wrote: >      >      >      >>>>
>                > Santosh and >     others, >      >      >      >>>>
>                          > >      >      >      >>>>
>          > On Thu, Oct >     03, 2019 at >      >      >     07:50:20PM >
>     >      >      >>>>                                 +0530, Santosh P >
>    K wrote: >      >      >      >>>>                                 >>
>  Thanks >     for your >      >      >     explanation. >      >      >
>   >>>>                                 This helps a lot. I >      >
>  would wait >      >      >     for more >      >      >      >>>>
>                        >> comments from >     others >      >     to see if
> >      >      >      >>>>                                 this what we >
>  need in this >      >      >     draft to be >      >      >      >>>>
>                              >> supported >     based on >      >     that
> we can >      >      >      >>>>                                 provide
> appropriate >      >     sections >      >      >     in the >      >
> >      >>>>                                 draft. >      >      >
> >>>>                                 > >      >      >      >>>>
>                      > The threads on the >      >     list have >      >
>     >      >>>>                                 spidered to the >     point
> >      >     where it is >      >      >      >>>>
>        challenging >      >      >      >>>>
>  > to follow what the >      >     current >      >      >     status >
>   >      >      >>>>                                 of the draft is, >
>  or should >      >      >     be.  :-) >      >      >      >>>>
>                        > >      >      >      >>>>
>        > However, if I've >      >     followed things >      >      >
> >>>>                                 properly, the >     question >      >
>    below is >      >      >      >>>>
>  really the >      >      >      >>>>                                 >
> hinge point on >     what our >      >      >      >>>>
>              encapsulation >     for BFD >      >     over vxlan >      >
>     >      >>>>                                 should look like. >      >
>     >      >>>>                                 > Correct? >      >      >
>     >>>>                                 > >      >      >      >>>>
>                          > Essentially, >     do we or >      >     do we
> not >      >      >      >>>>                                 require the
> >     ability to >      >     permit >      >      >      >>>>
>                    multiple BFD >      >      >      >>>>
>                > sessions between >      >     distinct VAPs? >      >
> >      >>>>                                 > >      >      >      >>>>
>                              > If this is so, >     do we >      >     have
> a >      >      >     sense >      >      >      >>>>
>            as to how we should >      >     proceed? >      >      >
> >>>>                                 > >      >      >      >>>>
>                      > -- Jeff >      >      >      >>>>
>              > >      >      >      >>>>                                 >
> [context preserved >      >     below...] >      >      >      >>>>
>                          > >      >      >      >>>>
>          >> Santosh P K >      >      >      >>>>
>        >> >      >      >      >>>>                                 >> On
> Wed, Sep >     25, 2019 >      >     at 8:10 AM >      >      >      >>>>
> >        >   >>
> >      >      <
> mailto:xiao.min2@zte.com.cn > <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >>> >      >      >
>   <
> mailto:xiao.min2@zte.com.cn > >     <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >> <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn > >     <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >>>> >      >      >
>   >>>> >      >       
> > <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >> >     <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn > <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >>> >      >      >
>   <
> mailto:xiao.min2@zte.com.cn > >     <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >> <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn > >     <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >>>>>> >      >
>  wrote: >      >      >      >>>>                                 >> >
> >      >      >>>>                                 >>> Hi Santosh, >
> >      >      >>>>                                 >>> >      >      >
> >>>>                                 >>> >      >      >      >>>>
>                        >>> With regard >     to the >      >     question
> >      >      >      >>>>                                 whether we >
>  should allow >      >      >     multiple BFD >      >      >      >>>>
>                              sessions >      >      >      >>>>
>                      >>> for the same >     VNI or >      >     not, >
> >      >     IMHO we >      >      >      >>>>
>    should allow it, >     more >      >      >     explanation as >      >
>     >      >>>>                                 >>> follows. >      >
> >      >>>>                                 >>> >      >      >      >>>>
>                                >>> Below is a >     figure >      >
>  derived from >      >      >      >>>>
>  figure 2 of >     RFC8014 (An >      >      >     Architecture for >
> >      >      >>>>                                 >>> Data-Center >
>  Network >      >      >      >>>>  Virtualization >     over Layer 3 >
>   >      >     (NVO3)). >      >      >      >>>>
>        >>> >      >      >      >>>>                                 >>> >
>             | >      >      >      >>>>
>   Data Center Network >      >     (IP)        | >      >      >      >>>>
>                                >>> >              | >      >      >
> >>>> >      >             | >      >      >      >>>>
>            >>> >      >      >      >>>> >      >      >
>  +-----------------------------------------+ >      >      >      >>>>
>                            >>> >      >             | >      >      >
> >>>> >           | >      >      >      >>>>
>  >>> >      >             | >      >      >      >>>>
>             Tunnel Overlay >          | >      >      >      >>>>
>                        >>> >      >      >      >>>> >
>  +------------+---------+ >      >      >      >>>> >
>   +---------+------------+ >      >      >      >>>>
>          >>>         | >      >      >      >>>> >
>  +----------+-------+ | >      >           | >      >      >      >>>> >
>    +-------+----------+ | >      >      >      >>>>
>          >>> >     | | >      >     Overlay >      >      >      >>>>
>                            Module  | | >       | | >      >     Overlay >
>     >      >      >>>>                                 Module  | | >
> >      >      >>>>                                 >>>         | >      >
>     >      >>>> >       +---------+--------+ | >      >           | >
> >      >      >>>> >       +---------+--------+ | >      >      >
> >>>>                                 >>>         | >      >           | >
>     >      >      >>>>                                     |    | >
>      | >      >      >          | >      >      >      >>>>
>                  >>>  NVE1   | >      >           | >      >      >
> >>>>                                     |    | >             | >      >
>   >          | >      >      >      >>>>
>  NVE2 >      >      >      >>>>                                 >>>
> | >      >      >      >>>> >       +--------+-------+  | >      >
>  | >      >      >      >>>> >       +--------+-------+  | >      >      >
>     >>>>                                 >>> >     |  |VNI1 >      >
> >     VNI2  VNI1 >      >      >      >>>>
>  |  |  |  | VNI1 >      >     VNI2 VNI1 >      >      >     |  | >      >
>     >      >>>>                                 >>>         | >      >
> >      >>>> >       +-+-----+----+---+  | >      >           | >      >
>   >      >>>> >       +-+-----+-----+--+  | >      >      >      >>>>
>                            >>> >     |VAP1| >      >     VAP2|    | >
> >      >      >>>>                                 VAP3 | >       |VAP1|
> VAP2| >      >      >       | VAP3| >      >      >      >>>>
>                    >>> >      >      >      >>>> >
>  +----+-----+----+------+ >      >      >      >>>> >
>   +----+-----+-----+-----+ >      >      >      >>>>
>          >>> >      >       |     | >      >      >        | >      >
> >      >>>>        | >      >       |     | >      >      >      >>>>
>                            >>> >      >       |     | >      >      >
>   | >      >      >      >>>>        | >      >       |     | >      >
> >      >>>>                                 >>> >      >       |     | >
>   >      >        | >      >      >      >>>>        | >      >       |
>  | >      >      >      >>>>                                 >>> >      >
>     >      >>>> >      >      > >
>  -------+-----+----+-------------------+-----+-----+------- >      >
> >      >>>>                                 >>> >      >       |     | >
>   >      >        | >      >      >      >>>>  Tenant        | >      >
>    |     | >      >      >      >>>>                                 >>> >
>    TSI1 | >      >     TSI2|    | >      >      >      >>>>
>                  TSI3 >     TSI1| TSI2| >      >      >       |TSI3 >
> >      >      >>>>                                 >>> >      >     +---+
> +---+ >      >      >      >>>>                                 +---+ >
>    +---+ >      >     +---+ >      >      >       +---+ >      >      >
>   >>>>                                 >>> >      >     |TS1| |TS2| >
> >      >      >>>>                                 |TS3| >       |TS4| >
>   >     |TS5| >      >      >       |TS6| >      >      >      >>>>
>                          >>> >      >     +---+ +---+ >      >      >
> >>>>                                 +---+ >       +---+ >      >     +---+
> >      >      >       +---+ >      >      >      >>>>
>            >>> >      >      >      >>>>
>  >>> To my >      >     understanding, the BFD >      >      >      >>>>
>                              sessions between >     NVE1 >      >     and
> NVE2 are >      >      >      >>>>                                 actually
> >      >      >      >>>>                                 >>> initiated and
> >      >     terminated >      >      >     at VAP >      >      >
> >>>>                                 of NVE. >      >      >      >>>>
>                            >>> >      >      >      >>>>
>              >>> If the >     network operator >      >      >     want to
> >      >      >      >>>>                                 set up one BFD >
>    session >      >     between >      >      >     VAP1 of >      >
> >      >>>>                                 >>> NVE1 and VAP1of >      >
>  NVE2, at the >      >      >      >>>>
>  same time >     another BFD >      >     session >      >      >
> >>>>                                 between VAP3 of >      >      >
> >>>>                                 >>> NVE1 and >     VAP3 of NVE2, >
>   >      >     although >      >      >      >>>>
>        the two BFD sessions >      >     are for >      >      >     the
> same >      >      >      >>>>                                 >>> VNI1, I
> >     believe it's >      >      >     reasonable, >      >      >
> >>>>                                 so that's why I >     think we >
> >      >     should allow it >      >      >      >>>> >      >      >
> >>>> >      >      >       _______________________________________________
> >      >      >      >>>>                                 nvo3 mailing list
> >      >      >      >>>> nvo3@ietf.org  >  <
> mailto:nvo3@ietf.org >> >       > <
> mailto:nvo3@ietf.org  >>>
> >      >       >  <
> mailto:nvo3@ietf.org >> >       > <
> mailto:nvo3@ietf.org  >>>>
>   > >      <
> mailto:nvo3@ietf.org >> >      >       > <
> mailto:nvo3@ietf.org  >>>
> >      >      >      <
> mailto:nvo3@ietf.org >   >> >     <
> mailto:nvo3@ietf.org  >
>   >>>>> >      >      >      >>>>
> https://www.ietf.org/mailman/listinfo/nvo3 >      >      >      >>>> >
>   >      > >      > >
>
>

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Date: Wed, 30 Oct 2019 10:31:42 +0530
From: Dinesh Dutt 
To: Anoop Ghanwani 
Cc: "Joel M. Halpern" , Santosh P K , Greg Mirsky ,  Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
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Trapping to the CPU would be fine based on MAC DA. But once there, a self=
-respecting network stack would look at the IP header to decide what to d=
o. Ignoring it on receive may not be an option,

Dinesh
On Oct 30, 2019, 10:26 AM +0530, Anoop Ghanwani =
, wrote:
> Hi Dinesh,
>
> What would break=3F=C2=A0 If messages are trapped to CPU based on the M=
AC DA, what is the problem=3F
>
> On the flip side, there are implementations running B=46D today which u=
se different addresses as specified here:
> http://www.openvswitch.org/support/dist-docs/vtep.5.html
> >>>
>       bfd=5Fconfig=5Flocal : bfd=5Fdst=5Fip: optional string
>              Set to an IPv4 address to set the IP address that is expec=
ted as
>              destination   for   received   B=46D   packets.   The  def=
ault  is
>              169.254.1.0.
> >>>
>
> Thanks,
> Anoop
>
> > On Tue, Oct 29, 2019 at 7:01 PM Dinesh Dutt  wrot=
e:
> > > I suspect silicon implementations will have a problem with saying t=
hat they can be set to anything and MUST be ignored on reception. Your lo=
gic is sound, it's just that I fear you'll break many existing implementa=
tions. I recommend sticking with the 127/8 address for this case.
> > >
> > > Dinesh
> > >
> > > On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern  wrote:
> > > > In all the discussion about what VNI to use and multiple VNI supp=
ort, I lsot track. Sorry. Still, the earlier documents did not specify th=
e IP to use. That does NOT mean that we are required in later revisions o=
f the document to allow anything the client wants. Having said that, we c=
ould add text saying that since the IP address in the B=46D request in VN=
I 0 is effectively meaningless, it can be set to any value on transmissio=
n and must be ignored on reception. As far as I can tell, it is definitio=
nal that the VtEP does not have any assigned IP address for VNI 0, so we =
can't expect that address. Yours, Joel On 10/29/2019 11:10 AM, Anoop Ghan=
wani wrote:
> > > > > Hi Joel, Yes, existing implementations use VNI 0 for B=46D over=
 VXLAN.=C2=A0 Here are a couple of references: https://www.juniper.net/do=
cumentation/en=5FUS/junos/topics/concept/sdn-ovsdb-bfd-nsx.html https://w=
ww.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switc=
hes/white-paper-c11-740091.html=23=5FToc18013665 I guess this document ha=
s been evolving and I have not kept up with it. The version I had reviewe=
d and commented on originally allowed for VNI 0.=C2=A0 The -04 version of=
 the draft has this: https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04=23=
section-7 What version are you referring to=3F Thanks, Anoop On Mon, Oct =
28, 2019 at 12:55 PM Joel M. Halpern > wrote: You are saying that there are existing implement=
ations using VNI 0 for this=3F=C2=A0 Given that previous versions of the =
spec explicitly disallowed VNI 0, I am having trouble with your objecting=
 that a spec for how to run over VNI 0 breask existing implementations. N=
ote that when there is a good technical reason, the IET=46 does change In=
ternet Drafts in ways that break early implementations.=C2=A0 That is the=
 price of standardization. Yours, Joel On 10/28/2019 2:30 PM, Anoop Ghanw=
ani wrote: > Hi Joel, > > Writing the spec in that way would make the cur=
rent, inter-operable > implementation of multiple vendors non-compliant w=
ith the spec. > > Thanks, > Anoop > > On Mon, Oct 28, 2019 at 11:07 AM Jo=
el M. Halpern  > >> wrote: > >=C2=
=A0 =C2=A0 =C2=A0I assumed this was only for the case where a tenant VNI =
was being used. > >=C2=A0 =C2=A0 =C2=A0=46or the 0 VNI (which is what I p=
refer), always (MUST) use the loopback >=C2=A0 =C2=A0 =C2=A0address.=C2=A0=
 There are no addresses assigned to the VTEP in that space. >=C2=A0 =C2=A0=
 =C2=A0There is no IRB in that space. > >=C2=A0 =C2=A0 =C2=A0Yours, >=C2=A0=
 =C2=A0 =C2=A0Joel > >=C2=A0 =C2=A0 =C2=A0On 10/28/2019 1:58 PM, Anoop Gh=
anwani wrote: >=C2=A0 =C2=A0 =C2=A0 > Joel, >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0=
 =C2=A0 =C2=A0 > Are we going to qualify this by VNI=3F=C2=A0 There's a b=
unch of >=C2=A0 =C2=A0 =C2=A0implementations >=C2=A0 =C2=A0 =C2=A0 > out =
there that don't use a tenant IP or a loopback with VNI 0--they >=C2=A0 =C2=
=A0 =C2=A0 > simply repeat the underlay IP in the inner IPDA. >=C2=A0 =C2=
=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 > Thanks, >=C2=A0 =C2=A0 =C2=A0 > Anoo=
p >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 > On Mon, Oct 28, 2019 at=
 10:46 AM Joel M. Halpern >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >  >>> wrote: >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0I can live with saying that you SHOULD use loopback,=
 and MAY >=C2=A0 =C2=A0 =C2=A0instead >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0use >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0an IP address in th=
e customer space known to be owned by the VTEP >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0device >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0when s=
uch exists. >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0Yours, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Joel >=C2=A0 =C2=A0=
 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0On 10/28/2019 1:32 P=
M, Anoop Ghanwani wrote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Hi=
 Joel, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 > Perhaps we need to say use of an address owned b=
y the device >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0containing >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > the VTEP. >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Or are =
you suggesting that the use of the loopback address >=C2=A0 =C2=A0 =C2=A0=
space >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0is a MUST=3F >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 > Anoop >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 > On Mon, Oct 28, 2019 at 10:22 AM Joel M. H=
alpern >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >  > >=C2=A0 =C2=A0 =C2=A0 >>>> wrote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0There is something I am missing in your assumption >=C2=A0 =C2=A0 =
=C2=A0about IRB. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0As I understand VxL=
AN, the VTEP is under the control >=C2=A0 =C2=A0 =C2=A0of the >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0operator. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0As such, it is a pure bridge.=C2=A0 If yo=
u run IRB behind >=C2=A0 =C2=A0 =C2=A0it, that >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0is fine. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0Yes, an operator may offer IRB.=C2=A0 But as I understan=
d it, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0conceptually, >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0in terms of the VxL=
AN architecture the IRB is an entity >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0behind the >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0VTEP, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0not part of the VTEP. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Yours,=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Joel >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0On 10/28/2019 12:23 PM, Anoop Ghanwani wr=
ote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > =
Santosh, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Do=
es it have to be a MUST=3F=C2=A0 What if I am running >=C2=A0 =C2=A0 =C2=A0=
IRB and there >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0are IP >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 > addresses per VNI assigned to the VTEPs=3F Why can the >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0operator not >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > choose to use those=3F >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Anoop >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > On Mon, Oct 28, 2019 at 7:51 AM=
 Santosh P K >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >  >=C2=A0 =C2=A0 =C2=A0> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0> >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0>>> >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0> >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0>>>>> wrote: >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Dine=
sh, Anoop et all, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lets us know if this=
 text works for 127/8 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0address =
range=3F >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0=5Bproposed text for firewall=5D >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=22As per secti=
on 4 inner destination IP address >=C2=A0 =C2=A0 =C2=A0MUST be >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0set to >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0127/8 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0address. There may be fire=
wall configured on >=C2=A0 =C2=A0 =C2=A0VTEP to >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0block 127/8 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0address range if set as destin=
ation IP in inner IP >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0header. I=
t is >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0recommended to allow 127/8 range address through >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0firewall only if >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0127/8 I=
P address is set as destination address >=C2=A0 =C2=A0 =C2=A0in inner IP =
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0header.=22=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0In section 4 we are talking about using 127/8 >=C2=A0 =C2=A0 =C2=A0and=
 not >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0really >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0giving >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0reason =
why. I think we should have text as R=46C 5884 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0has mentioned >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0with below text. >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=5B=46r=
om R=46C 5884=5D >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=22The motivation for using the address rang=
e >=C2=A0 =C2=A0 =C2=A0127/8 is >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
the same as >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0specified in Section=C2=A02.1 of =5BR=46C4379=5D=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > =C2=A0=
. >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0This is an >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0exception to the behavior =
defined in =5BR=46C1122 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
=5D.=22 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0Thanks >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0Santosh P K >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt =
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 =
>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0>  >=C2=A0 =C2=A0 =
=C2=A0>> >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=
=A0 =C2=A0 =C2=A0 <=
mailto:didutt=40gmail.com >>>>> wrote: >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0Looks good to me Greg. I see that the text >=C2=A0 =C2=A0 =C2=
=A0around >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0the use >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0of the >=C2=A0 =C2=A0 =
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=C2=A0 =C2=A0inner IP address as also quite acceptable. Will >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0you add any >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0words=
 about the firewall=3F >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Dinesh >=C2=A0 =C2=A0 =C2=A0 >=
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n Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
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gregimirsky=40gmail.com  >=C2=A0 =C2=A0 =C2=
=A0> >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >>> >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0>  >=C2=A0 =C2=A0 =C2=A0>> >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >>>>> wrote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Dinesh, =
et al., >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0please check the updated version tha=
t >=C2=A0 =C2=A0 =C2=A0removed the >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0reference to >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hypervi=
sor in the text and =46igure 1. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Regards, >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0Greg >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On Wed, Oct 23, 2019 at 10=
:47 AM Santosh P K >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0>=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> =C2=A0 >=C2=A0 =C2=A0 =C2=A0> >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0>>>>> wrote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0Dinesh, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 =C2=A0=
 =C2=A0Please see my inline=C2=A0comments =5BSPK=5D >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0- In section 3, there's a sentence >=C2=A0 =C2=
=A0 =C2=A0that >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0is: =22B=46D >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0packets intended for =
a Hypervisor >=C2=A0 =C2=A0 =C2=A0VTEP MUST >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0NOT..=22. I >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0recommend getting rid of the word >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=22Hypervisor=22 ashe >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0logic applies to any VTEP. >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0=5BSPK=5D Thanks for comments. We will >=C2=A0=
 =C2=A0 =C2=A0change this. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0- You already explained the >=C2=A0 =C2=A0 =C2=A0precedence of >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0the use of >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0127/8 address in the inner header in >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0MPLS. I have no >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0specific comments in that area. I have=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0only two >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0questions: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 =C2=A0- Has anybody verified that the =
>=C2=A0 =C2=A0 =C2=A0use of >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A012=
7/8 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0address (and t=
he right MAC) works with >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0exist=
ing >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0implementation=
s, including the silicon >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0ones=3F=
 If this >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0doesn't =
work there, is it worth >=C2=A0 =C2=A0 =C2=A0adding the >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0possibilit >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0y of another address, one that =
is >=C2=A0 =C2=A0 =C2=A0owned >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
by the >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0V=
TEP node=3F >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 =C2=
=A0- Do we know if =46irewalls stop >=C2=A0 =C2=A0 =C2=A0such VXLAN >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0packets=3F >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I ask this because VX=
LAN has an IP >=C2=A0 =C2=A0 =C2=A0header >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0and I >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0don't >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0know =
if firewalls stop packets >=C2=A0 =C2=A0 =C2=A0with 127/8 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0in the >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0inner >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0header. If not, is it worth adding a >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0sentence to say >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0that firewalls =C2=A0allow such >=C2=A0 =C2=A0 =C2=A0=
packets=3F The >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0use of a >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0non-127/8 address may al=
leviate >=C2=A0 =C2=A0 =C2=A0this case >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0as well. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=5BSPK=5D I think w=
e may need to add the text >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0abo=
ut firewall >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0as some checks in f=
irewall will be >=C2=A0 =C2=A0 =C2=A0there if >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0they are not >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0alrea=
dy using MPLS OAM which has inner IP >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0header with >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0127/8 addres=
s range. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> =
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The rest of the d=
raft looks good >=C2=A0 =C2=A0 =C2=A0to me, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0Dinesh >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0On Wed, Oct 23, 2019 at 7:58 AM, >=C2=A0 =C2=A0 =C2=A0Greg Mirsky =
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0=
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--5db9193c_483e0de1_7d35
Content-Type: text/html; charset="utf-8"
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Trapping to the CPU would be fine based on MAC DA. =
But once there, a self-respecting network stack would look at the IP head=
er to decide what to do. Ignoring it on receive may not be an option,



Dinesh




On Oct 30, 2019, 10:26 AM +0530, An=
oop Ghanwani <anoop=40alumni.duke.edu>, wrote:




Hi Dinesh,




What would break=3F&=23160; If messages are trapped to CPU based on =
the MAC DA, what is the problem=3F





On the flip side, there are implementations running B=46D today whic=
h use different addresses as specified here:


http://www.openvswitch.org/support/dist-docs/vtep.5.html


>>>




       bfd=5F=
config=5Fl=
ocal : bfd=5F=
dst=5Fip: optional string
              Set to an IPv4 address to set the IP address that is expect=
ed as
              destination   for   received   B=46D   packets.   The  defa=
ult  is
              169.254=
.1.0.


>>>





Thanks,


Anoop








On Tue, Oct 29, 2019 at 7=
:01 PM Dinesh Dutt <didutt=40=
gmail.com> wrote:






I suspect silicon implementations will have a problem with saying th=
at they can be set to anything and MUST be ignored on reception. Your log=
ic is sound, it's just that I fear you'll break many existing implementat=
ions. I recommend sticking with the 127/8 address for this case.





Dinesh






On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern <jmh=40joelhalpern.com> wrote:




In all the discussion about what =
VNI to use and multiple VNI support, I lsot track. Sorry. Still, the earl=
ier documents did not specify the IP to use. That does NOT mean that we a=
re required in later revisions of the document to allow anything the clie=
nt wants. Having said that, we could add text saying that since the IP ad=
dress in the B=46D request in VNI 0 is effectively meaningless, it can be=
 set to any value on transmission and must be ignored on reception. As fa=
r as I can tell, it is definitional that the VtEP does not have any assig=
ned IP address for VNI 0, so we can't expect that address. Yours, Joel On=
 10/29/2019 11:10 AM, Anoop Ghanwani wrote:

Hi Joel, Yes, existing implementations use VNI 0 for B=46D ov=
er VXLAN.&=23160; Here are a couple of references: https://www.juniper.net/documentation/=
en=5FUS/junos/topics/concept/sdn-ovsdb-bfd-nsx.html https://www.cisco.com/c/en/us/products/collateral/switches/nexus-=
9000-series-switches/white-paper-c11-740091.html=23=5FToc18013665 I g=
uess this document has been evolving and I have not kept up with it. The =
version I had reviewed and commented on originally allowed for VNI 0.&=23=
160; The -04 version of the draft has this: https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04=23section-7 What=
 version are you referring to=3F Thanks, Anoop On Mon, Oct 28, 2019 at 12=
:55 PM Joel M. Halpern <jmh=40joelhalpern.com <mailto:jmh=40joelhalpern=
.com>> wrote: You are saying that there are existing implementa=
tions using VNI 0 for this=3F&=23160; Given that previous versions of the=
 spec explicitly disallowed VNI 0, I am having trouble with your objectin=
g that a spec for how to run over VNI 0 breask existing implementations. =
Note that when there is a good technical reason, the IET=46 does change I=
nternet Drafts in ways that break early implementations.&=23160; That is =
the price of standardization. Yours, Joel On 10/28/2019 2:30 PM, Anoop Gh=
anwani wrote: > Hi Joel, > > Writing the spec in that way would =
make the current, inter-operable > implementation of multiple vendors =
non-compliant with the spec. > > Thanks, > Anoop > > On Mo=
n, Oct 28, 2019 at 11:07 AM Joel M. Halpern <jmh=40joelhalpern.com <=
mail=
to:jmh=40joelhalpern.com> > <mailto:jmh=40joelhalpern.com &l=
t;ma=
ilto:jmh=40joelhalpern.com>>> wrote: > >&=23160; &=231=
60; &=23160;I assumed this was only for the case where a tenant VNI was b=
eing used. > >&=23160; &=23160; &=23160;=46or the 0 VNI (which is w=
hat I prefer), always (MUST) use the loopback >&=23160; &=23160; &=231=
60;address.&=23160; There are no addresses assigned to the VTEP in that s=
pace. >&=23160; &=23160; &=23160;There is no IRB in that space. > &=
gt;&=23160; &=23160; &=23160;Yours, >&=23160; &=23160; &=23160;Joel &g=
t; >&=23160; &=23160; &=23160;On 10/28/2019 1:58 PM, Anoop Ghanwani wr=
ote: >&=23160; &=23160; &=23160; > Joel, >&=23160; &=23160; &=23=
160; > >&=23160; &=23160; &=23160; > Are we going to qualify thi=
s by VNI=3F&=23160; There's a bunch of >&=23160; &=23160; &=23160;impl=
ementations >&=23160; &=23160; &=23160; > out there that don't use =
a tenant IP or a loopback with VNI 0--they >&=23160; &=23160; &=23160;=
 > simply repeat the underlay IP in the inner IPDA. >&=23160; &=231=
60; &=23160; > >&=23160; &=23160; &=23160; > Thanks, >&=23160=
; &=23160; &=23160; > Anoop >&=23160; &=23160; &=23160; > >&=23=
160; &=23160; &=23160; > On Mon, Oct 28, 2019 at 10:46 AM Joel M. Halp=
ern >&=23160; &=23160; &=23160;<jmh=40joelhalpern.com <mailto:jmh=40j=
oelhalpern.com> <mailto:jmh=40joelhalpern.com <mailto:jmh=40joel=
halpern.com>> >&=23160; &=23160; &=23160; > <mailto:jmh=40j=
oelhalpern.com <mailto:jmh=40joelhalpern.com> <mailto:jmh=40joel=
halpern.com <mailto:jmh=40joelhalpern.com>>>> wrote: &g=
t;&=23160; &=23160; &=23160; > >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160;I can live with saying that you SHOULD use loopback=
, and MAY >&=23160; &=23160; &=23160;instead >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160;use >&=23160; &=23160; &=23160; >=
;&=23160; &=23160; &=23160;an IP address in the customer space known to b=
e owned by the VTEP >&=23160; &=23160; &=23160; >&=23160; &=23160; =
&=23160;device >&=23160; &=23160; &=23160; >&=23160; &=23160; &=231=
60;when such exists. >&=23160; &=23160; &=23160; > >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160;Yours, >&=23160; &=23160; =
&=23160; >&=23160; &=23160; &=23160;Joel >&=23160; &=23160; &=23160=
; > >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;On 10=
/28/2019 1:32 PM, Anoop Ghanwani wrote: >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160; > Hi Joel, >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160; > >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160; > Perhaps we need to say use of an address o=
wned by the device >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160;containing >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; > the VTEP. >&=23160; &=23160; &=23160; >&=23160; &=23160; =
&=23160; > >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; > Or are you suggesting that the use of the loopback address >&=23=
160; &=23160; &=23160;space >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160;is a MUST=3F >&=23160; &=23160; &=23160; >&=23160; =
&=23160; &=23160; > >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; > Anoop >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; > >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160;<jmh=40joelhalpern.com =
<=
mailto:jmh=40joelhalpern.com> <mailto:jmh=40joelhalpern.com <=
;mai=
lto:jmh=40joelhalpern.com>> >&=23160; &=23160; &=23160;<<=
a href=3D=22mailto:jmh=40joelhalpern.com=22 target=3D=22=5Fblank=22>mailt=
o:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.com> <mailto:j=
mh=40joelhalpern.com <mailto:jmh=40joelhalpern.com>>> >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; > <mailto:jm=
h=40joelhalpern.com <mailto:jmh=40joelhalpern.com> <mailto:jmh=40j=
oelhalpern.com <mailto:jmh=40joelhalpern.com>> >&=23160; =
&=23160; &=23160;<mailto:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.=
com> <mailto:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.com>>>>> wrote: >&=23160; &=23160; &=23160; >&=23160;=
 &=23160; &=23160; > >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160;There is something I am missin=
g in your assumption >&=23160; &=23160; &=23160;about IRB. >&=23160=
; &=23160; &=23160; >&=23160; &=23160; &=23160; > >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0;As I understand VxLAN, the VTEP is under the control >&=23160; &=231=
60; &=23160;of the >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160;operator. >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160;As such, it is a pure bridge.&=23160; =
If you run IRB behind >&=23160; &=23160; &=23160;it, that >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160;is fine. >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0;Yes, an operator may offer IRB.&=23160; But as I understand it, >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160;conceptually, >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160;in terms of the VxLAN architecture the IRB is an entity >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160;behind the >&=231=
60; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160;VTEP, >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160;not part of the VTEP. >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; > >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;Your=
s, >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160;Joel >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; > >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160;On 10/28/2019 12:23 PM, Anoop Ghanw=
ani wrote: >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; > Santosh, >&=23160; &=23160; &=2316=
0; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; > >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160; > Does it have to be a MUST=3F&=23160; What if I am r=
unning >&=23160; &=23160; &=23160;IRB and there >&=23160; &=23160; =
&=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;are=
 IP >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; > addresses per VNI assigned to the VTEPs=3F Wh=
y can the >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;op=
erator not >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; > choose to use those=3F >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; > >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160; > Anoop >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; > >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; > <santosh.pallagatti=40gmail.com <mailto:s=
antosh.pallagatti=40gmail.com> >&=23160; &=23160; &=23160;<<=
a href=3D=22mailto:santosh.pallagatti=40gmail.com=22 target=3D=22=5Fblank=
=22>mailto:santosh.pallagatti=40gmail.com <mailto:santosh.pal=
lagatti=40gmail.com>> >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160;<mailto:santosh.pallagatti=40gmail.com &l=
t;mailto:santosh.pallagatti=40gmail.com> >&=23160; &=23160=
; &=23160;<mailto:santosh.pallagatti=40gmail.com <mailt=
o:santosh.pallagatti=40gmail.com>>> >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;<mailto:santosh.pallagatti=40gmail.com <mailto:santosh.pallag=
atti=40gmail.com> >&=23160; &=23160; &=23160;<mailto:sa=
ntosh.pallagatti=40gmail.com <mailto:santosh.pallagatti=40gma=
il.com>> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160;<mailto:santosh.pallagatti=40gmail.com <mailto:s=
antosh.pallagatti=40gmail.com> >&=23160; &=23160; &=23160;<<=
a href=3D=22mailto:santosh.pallagatti=40gmail.com=22 target=3D=22=5Fblank=
=22>mailto:santosh.pallagatti=40gmail.com <mailto:santosh.pal=
lagatti=40gmail.com>>>> >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;<mailt=
o:santosh.pallagatti=40gmail.com <mailto:santosh.pallagatti=40=
gmail.com> >&=23160; &=23160; &=23160;<mailto:santosh.p=
allagatti=40gmail.com <mailto:santosh.pallagatti=40gmail.com<=
/a>>> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;=
<mailto:santosh.pallagatti=40gmail.com <mailto:santos=
h.pallagatti=40gmail.com> >&=23160; &=23160; &=23160;<m=
ailto:santosh.pallagatti=40gmail.com <mailto:santosh.pallagat=
ti=40gmail.com>>> >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160; >&=23160; &=23160; &=23160;<mailto:santosh=
.pallagatti=40gmail.com <mailto:santosh.pallagatti=40gmail.co=
m> >&=23160; &=23160; &=23160;<mailto:santosh.pallagatt=
i=40gmail.com <mailto:santosh.pallagatti=40gmail.com>>=
; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;<m=
ailto:santosh.pallagatti=40gmail.com <mailto:santosh.pallagat=
ti=40gmail.com> >&=23160; &=23160; &=23160;<mailto:sant=
osh.pallagatti=40gmail.com <mailto:santosh.pallagatti=40gmail=
.com>>>>>> wrote: >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; > >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >&=23160; &=23160; &=23160;Dinesh, Anoop et all, >&=231=
60; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; &=23160; &=23160; &=23160;Lets =
us know if this text works for 127/8 >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160;address range=3F >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; > >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >&=23160; &=23160; &=23160;=5Bproposed text for firewall=5D=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; > >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0;=22As per section 4 inner destination IP address >&=23160; &=23160; =
&=23160;MUST be >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160;set to >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160;127/8 >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160;address. There may be firewall configured on >&=23160; &=23=
160; &=23160;VTEP to >&=23160; &=23160; &=23160; >&=23160; &=23160;=
 &=23160;block 127/8 >&=23160; &=23160; &=23160; >&=23160; &=23160;=
 &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;ad=
dress range if set as destination IP in inner IP >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160;header. It is >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160;recommended to allow 127/8 range address through &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;firewall only =
if >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160;127/8 IP address is =
set as destination address >&=23160; &=23160; &=23160;in inner IP >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160;header.=22 >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; > >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; > &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160;In section 4 we are talk=
ing about using 127/8 >&=23160; &=23160; &=23160;and not >&=23160; =
&=23160; &=23160; >&=23160; &=23160; &=23160;really >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160=
;giving >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;reason why. I t=
hink we should have text as R=46C 5884 >&=23160; &=23160; &=23160; >=
;&=23160; &=23160; &=23160;has mentioned >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160;=
 &=23160; &=23160;with below text. >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; > >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160;=5B=46rom R=46C 5884=5D >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160;=22The motivation for using the addres=
s range >&=23160; &=23160; &=23160;127/8 is >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160;the same as >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160;specified in Section&=23160;2.1 of =5BR=46C4379=5D =
>&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160; > &=23160;<https://tools.ietf.=
org/html/rfc4379=23section-2.1>. >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160;This is an >&=23160; &=23160; &=23160; >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160;exception to the behavior defined in =5BR=46C1122 >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >&=23160; &=23160; &=23160;<https://tools.ietf.org/h=
tml/rfc1122>=5D.=22 >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; > >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160; > >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0;Thanks >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;Santosh P K &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; =
&=23160; &=23160; > >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >&=23160; &=23160; &=23160; > >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; > &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160;On Thu, Oct 24, 2019 at =
1:24 AM Dinesh Dutt >&=23160; &=23160; &=23160; >&=23160; &=23160; =
&=23160;<didutt=40gmail.com <mailto:didutt=40gmail.com> <mailto:didutt=40g=
mail.com <mailto:didutt=40gmail.com>> >&=23160; &=23160; &=23=
160;<mailto:didutt=40gmail.com <mailto:didutt=40gmail.com> <mailto:didutt=40=
gmail.com <mailto:didutt=40gmail.com>>> >&=23160; &=23160; =
&=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;<=
;mailto=
:didutt=40gmail.com <mailto:didutt=40gmail.com> <mailto:didutt=40gmail=
.com <mailto:didutt=40gmail.com>> >&=23160; &=23160; &=23160=
;<ma=
ilto:didutt=40gmail.com <mailto:didutt=40gmail.com> <mailto:didutt=40g=
mail.com <mailto:didutt=40gmail.com>>>> >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160;<mailto:didutt=40gmail.com <mailto:didutt=40g=
mail.com> >&=23160; &=23160; &=23160;<mailto:didutt=40gmail.com=
 <ma=
ilto:didutt=40gmail.com>> <mailto:didutt=40gmail.com <mailto:didutt=
=40gmail.com> >&=23160; &=23160; &=23160;<mailto:didutt=40gmail.com=
 <mailto:didutt=40gmail.com>>> >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160;<mailto:didutt=40gmail.com <mailto:didutt=40gmai=
l.com> <mailto:didutt=40gmail.com <mailto:didutt=40gmail.com>>=
 >&=23160; &=23160; &=23160;<mailto:didutt=40gmail.com <mailto:didutt=40gmai=
l.com> <mailto:didutt=40gmail.com <mailto:didutt=40gmail.com>>=
>>>> wrote: >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; > >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; &=23160; &=23160;Looks good to me Greg. I see that=
 the text >&=23160; &=23160; &=23160;around >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160;the use >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;of the >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; &=23160; &=23160;inner IP ad=
dress as also quite acceptable. Will >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160;you add any >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; &=23160; &=23160;words about the firewall=3F >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; > >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=23160; &=23=
160;Dinesh >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; > >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; &=23160; &=23160;On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160; &=23160; &=23160;<=
gr=
egimirsky=40gmail.com <mailto:gregimirsky=40gmail.com> >&=23=
160; &=23160; &=23160;<mailto:gregimirsky=40gmail.com <mailto:gregi=
mirsky=40gmail.com>> >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160;<mailto:gregimirsky=40gmail.com <mailto:gregimir=
sky=40gmail.com> <mailto:gregimirsky=40gmail.com <mailto:gregi=
mirsky=40gmail.com>>> >&=23160; &=23160; &=23160;<mailto=
:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com> <=
;m=
ailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com>=
;> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;<mail=
to:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com> &=
lt;mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com&g=
t;>>> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=231=
60; >&=23160; &=23160; &=23160;<mailto:gregimirsky=40gmail.com &l=
t;=
mailto:gregimirsky=40gmail.com> >&=23160; &=23160; &=23160;<=
ma=
ilto:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com>=
> <mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.co=
m> >&=23160; &=23160; &=23160;<mailto:gregimirsky=40gmail.com<=
/a> <mailto:gregimirsky=40gmail.com>>> >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160;<mailto:gregimirsky=40gmail.com=
 <mailto:gregimirsky=40gmail.com> <mailto:gregimirsky=40gmai=
l.com <mailto:gregimirsky=40gmail.com>> >&=23160; &=231=
60; &=23160;<mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gma=
il.com> <mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40=
gmail.com>>>>>> wrote: >&=23160; &=23160; &=2316=
0; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>=
&=23160; &=23160; &=23160; &=23160; &=23160;Hi Dinesh, et al., >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160;=
 &=23160; >>&=23160; &=23160; &=23160; &=23160; &=23160;please chec=
k the updated version that >&=23160; &=23160; &=23160;removed the >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160;reference to >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23=
160; &=23160; &=23160;Hypervisor in the text and =46igure 1. >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23160; &=23=
160; &=23160;Regards, >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=231=
60; &=23160; &=23160;Greg >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >> >&=23160; &=2316=
0; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;=
 >>&=23160; &=23160; &=23160; &=23160; &=23160;On Wed, Oct 23, 2019=
 at 10:47 AM Santosh P K >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23=
160; &=23160; &=23160;<santosh.pallagatti=40gmail.com <mailto:santosh.pallagatti=40gmail.com> >&=23160; &=23160; &=23=
160;<mailto:santosh.pallagatti=40gmail.com <mailto:san=
tosh.pallagatti=40gmail.com>> >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160;<mailto:santosh.pallagatti=40gmail.co=
m <mailto:santosh.pallagatti=40gmail.com> >&=23160;=
 &=23160; &=23160;<mailto:santosh.pallagatti=40gmail.com <mailto:santosh.pallagatti=40gmail.com>>> >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160=
;<mailto:santosh.pallagatti=40gmail.com <mailto:santos=
h.pallagatti=40gmail.com> >&=23160; &=23160; &=23160;<m=
ailto:santosh.pallagatti=40gmail.com <mailto:santosh.pallagat=
ti=40gmail.com>> >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160;<mailto:santosh.pallagatti=40gmail.com <=
mailto:santosh.pallagatti=40gmail.com> >&=23160; &=23160; &=231=
60;<mailto:santosh.pallagatti=40gmail.com <mailto:san=
tosh.pallagatti=40gmail.com>>>> >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&g=
t; &=23160;<mailto:santosh.pallagatti=40gmail.com <ma=
ilto:santosh.pallagatti=40gmail.com> >&=23160; &=23160; &=23160=
;<mailto:santosh.pallagatti=40gmail.com <mailto:santos=
h.pallagatti=40gmail.com>> >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160;<mailto:santosh.pallagatti=40gmail.com <mailto:santosh.pallagatti=40gmail.com> >&=23160; &=23=
160; &=23160;<mailto:santosh.pallagatti=40gmail.com <=
mailto:santosh.pallagatti=40gmail.com>>> >&=23160; &=2316=
0; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;=
<mailto:santosh.pallagatti=40gmail.com <mailto:santos=
h.pallagatti=40gmail.com> >&=23160; &=23160; &=23160;<m=
ailto:santosh.pallagatti=40gmail.com <mailto:santosh.pallagat=
ti=40gmail.com>> >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160;<mailto:santosh.pallagatti=40gmail.com <=
mailto:santosh.pallagatti=40gmail.com> >&=23160; &=23160; &=231=
60;<mailto:santosh.pallagatti=40gmail.com <mailto:san=
tosh.pallagatti=40gmail.com>>>>>> wrote: >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160;=
 &=23160; >> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160;Dinesh, >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=
=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;&=23160; &=23=
160; &=23160;Please see my inline&=23160;comments =5BSPK=5D >&=23160; =
&=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >&=23160; &=23160; &=23160; >> >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60;- In section 3, there's a sentence >&=23160; &=23160; &=23160;that =
>&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;is: =22B=46D=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; >>&=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160;packets intended for a Hypervisor >=
;&=23160; &=23160; &=23160;VTEP MUST >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;NOT..=22. I >&=
=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >>&=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160;recommend getting rid of the word >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160;=22Hypervisor=22 ashe =
>&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160; >>&=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160;logic applies to any VTEP. >&=23160=
; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; =
&=23160; >> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160;=5BSPK=5D Thanks for comments. We will >=
;&=23160; &=23160; &=23160;change this. >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >> >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >>&=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160;- You already explained the >&=23160; &=23=
160; &=23160;precedence of >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160;the use of >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;127/8 address i=
n the inner header in >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160;MPLS. I have no >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;specific commen=
ts in that area. I have >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160;only two >&=23160; &=23160; &=23160; >&=23160; &=23160;=
 &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;questions: >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160;&=23160; &=23160;- Has anybody verified that t=
he >&=23160; &=23160; &=23160;use of >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160;127/8 >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;addres=
s (and the right MAC) works with >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160;existing >&=23160; &=23160; &=23160; >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;implemen=
tations, including the silicon >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160;ones=3F If this >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;doesn'=
t work there, is it worth >&=23160; &=23160; &=23160;adding the >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160;possibilit >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;y of another add=
ress, one that is >&=23160; &=23160; &=23160;owned >&=23160; &=2316=
0; &=23160; >&=23160; &=23160; &=23160;by the >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;VTEP no=
de=3F >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160; >> >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;&=2316=
0; &=23160;- Do we know if =46irewalls stop >&=23160; &=23160; &=23160=
;such VXLAN >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160;packets=3F >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60;I ask this because VXLAN has an IP >&=23160; &=23160; &=23160;heade=
r >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;and I >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160;don't >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;know if firewalls s=
top packets >&=23160; &=23160; &=23160;with 127/8 >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160;in the >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;inner &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160;=
 &=23160; &=23160; >>&=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160;header. If not, is it worth adding a &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;sentence to sa=
y >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160; >>&=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160;that firewalls &=23160;allow such &g=
t;&=23160; &=23160; &=23160;packets=3F The >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160;use of a >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0;non-127/8 address may alleviate >&=23160; &=23160; &=23160;this case=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;as well. &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; =
&=23160; &=23160; >> >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160;=5BSPK=5D I think we may need to =
add the text >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160=
;about firewall >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160;as some checks in firewall will be >&=23=
160; &=23160; &=23160;there if >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160;they are not >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160;already using MPLS OAM w=
hich has inner IP >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160;header with >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160;127/8 address range. >&=23160; &=23160;=
 &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
;&=23160; &=23160; &=23160; >> >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;T=
he rest of the draft looks good >&=23160; &=23160; &=23160;to me, >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >> >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;Dinesh >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >> >&=23160; &=23160; &=23160; >&=23160; &=23160;=
 &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;On Wed, Oct 23, 2=
019 at 7:58 AM, >&=23160; &=23160; &=23160;Greg Mirsky >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160;<gregimirsky=40gmail.com <mailto:gregimirsky=40gm=
ail.com> >&=23160; &=23160; &=23160;<mailto:gregimirsky=40gmai=
l.com <mailto:gregimirsky=40gmail.com>> >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160;<mailto:gregimirsky=40gmail.c=
om <mailto:gregimirsky=40gmail.com> <mailto:gregimirsky=40gm=
ail.com <mailto:gregimirsky=40gmail.com>>> >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160;<mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com=
> >&=23160; &=23160; &=23160;<mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com>> <mailto:gregimirsky=40gm=
ail.com <mailto:gregimirsky=40gmail.com> >&=23160; &=23160; =
&=23160;<mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.=
com>>>> >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160;<mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gma=
il.com> <mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40=
gmail.com>> >&=23160; &=23160; &=23160;<mailto:gregimirsky=40=
gmail.com <mailto:gregimirsky=40gmail.com> <mailto:gregimirsk=
y=40gmail.com <mailto:gregimirsky=40gmail.com>>> >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160;<mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gma=
il.com> >&=23160; &=23160; &=23160;<mailto:gregimirsky=40gmail=
.com <mailto:gregimirsky=40gmail.com>> <mailto:gregimirsky=40=
gmail.com <mailto:gregimirsky=40gmail.com> >&=23160; &=2316=
0; &=23160;<mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gma=
il.com>>>>>> >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;wrote:=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; >>>&=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160;Hi Dinesh, >&=23160; &=23160; =
&=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &g=
t;>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160;I greatly appreciate your comments. >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160;Please heave a >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160;look at the attached copy of the >&=23160; &=231=
60; &=23160;working >&=23160; &=23160; &=23160; >&=23160; &=23160; =
&=23160; >&=23160; &=23160; &=23160;version and >&=23160; &=23160; =
&=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &g=
t;>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160;its diff to -07 (latest in the >&=23160; &=23160; &=23=
160;datatracker). >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>> >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&g=
t;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160;Regards, >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >>>&=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;Greg >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >>> >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>>&=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;On Tue, O=
ct 22, 2019 at 9:52 PM >&=23160; &=23160; &=23160;Dinesh Dutt >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160;<didutt=40gmail.com <mailto:didutt=40gmail.com=
> >&=23160; &=23160; &=23160;<mailto:didutt=40gmail.com <mailto:did=
utt=40gmail.com>> >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160;<mailto:didutt=40gmail.com <mailto:didutt=40gmail.com> &l=
t;mailt=
o:didutt=40gmail.com <mailto:didutt=40gmail.com>>> >&=231=
60; &=23160; &=23160;<mailto:didutt=40gmail.com <mailto:didutt=40gmail.com> <mailto:didutt=40gmail.com <mailto:didutt=40gmail.com>> >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160;<mailto:didutt=40gmail.c=
om <mailto:didutt=40gmail.com> <mailto:didutt=40gmail.com <mailto:didu=
tt=40gmail.com>>>> >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160;<mailto:didutt=40gmail.c=
om <mailto:didutt=40gmail.com> <mailto:didutt=40gmail.com <mailto:didu=
tt=40gmail.com>> >&=23160; &=23160; &=23160;<mailto:didutt=40gmai=
l.com <mailto:didutt=40gmail.com> <mailto:didutt=40gmail.com <mailto:di=
dutt=40gmail.com>>> >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160;<mailto:didutt=40gmail.com <mailto:didutt=40gmail.com> <mailto:didutt=40gmail.com <mailto:didutt=40gmail.com>> >&=23=
160; &=23160; &=23160;<mailto:didutt=40gmail.com <mailto:didutt=40gmail.com> <mailto:didutt=40gmail.com <mailto:didutt=40gmail.com>>>&=
gt;>> wrote: >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >>> >&=23160; &=23160;=
 &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160;I have the same feeling as Anoop. >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;Greg, can you &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160;=
 &=23160; &=23160; >>>&=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;please point me t=
o the latest >&=23160; &=23160; &=23160;draft >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160;so that >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;I can >&=
=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160;quickly glance through i=
t to be >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;doub=
ly sure, >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160; >>> >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>=
;&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160;Dinesh >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160; >&=23160; &=23160; &=23160; >>> >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160;On Wed, Oct 23, 2019 at =
4:35 AM, >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;Ano=
op Ghanwani >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160; >>>&=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;<anoo=
p=40alumni.duke.edu <mailto:anoop=40alumni.duke.edu> >&=231=
60; &=23160; &=23160;<mailto:anoop=40alumni.duke.edu <mailto:anoop=40=
alumni.duke.edu>> >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160;<mailto:anoop=40alumni.duke.edu <mailto:anoop=40alu=
mni.duke.edu> <mailto:anoop=40alumni.duke.edu <mailto:anoop=40=
alumni.duke.edu>>> >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160;<mailto:anoop=40alumn=
i.duke.edu <mailto:anoop=40alumni.duke.edu> >&=23160; &=2316=
0; &=23160;<mailto:anoop=40alumni.duke.edu <mailto:anoop=40alumni.du=
ke.edu>> <mailto:anoop=40alumni.duke.edu <mailto:anoop=40=
alumni.duke.edu> >&=23160; &=23160; &=23160;<mailto:anoop=40al=
umni.duke.edu <mailto:anoop=40alumni.duke.edu>>>> &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; =
&=23160; &=23160; >>> &=23160;<mailto:anoop=40alumni.duke.edu <mailto:anoop=40alumni.duke.edu> >&=23160; &=23160; &=23160=
;<mailto:anoop=40alumni.duke.edu <mailto:anoop=40alumni.duke.edu&=
gt;> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;<=
ma=
ilto:anoop=40alumni.duke.edu <mailto:anoop=40alumni.duke.edu>=
 <mailto:anoop=40alumni.duke.edu <mailto:anoop=40alumni.duke.edu&=
gt;>> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160;<mailto:anoop=40alumni.duke.edu <<=
a href=3D=22mailto:anoop=40alumni.duke.edu=22 target=3D=22=5Fblank=22>mai=
lto:anoop=40alumni.duke.edu> >&=23160; &=23160; &=23160;<mailt=
o:anoop=40alumni.duke.edu <mailto:anoop=40alumni.duke.edu>>=
; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;<mailto:a=
noop=40alumni.duke.edu <mailto:anoop=40alumni.duke.edu> >&=
=23160; &=23160; &=23160;<mailto:anoop=40alumni.duke.edu <mailto:anoop=
=40alumni.duke.edu>>>>>> wrote: >&=23160; &=2316=
0; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;=
 >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160;Greg, >&=23160; &=23160; &=231=
60; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>=
;>> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;I =
think the draft is fine as is. >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>> >&=
=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;I discussion with =
Xiao Min was >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160=
;about =233 and I >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60;see that as unnecessary until we >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160;have a draft >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160;that explains why that is >&=23160; &=23160; &=23=
160;needed in the >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160;context >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&g=
t;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160;of the NVO3 architecture. >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>> >&=23160; &=23160; &=23160; >&=23160; &=23160; =
&=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160;Anoop >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >&=23160; &=23160; &=23160; >>>> >&=23160; &=23160; =
&=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &g=
t;>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160;On Tue, Oct 22, 2019 at 11:17 AM &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;Greg Mirsky &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160;=
 &=23160; &=23160; >>>> &=23160;<gregimirsky=40gmail.com=
 <mailto:gregimirsky=40gmail.com> >&=23160; &=23160; &=23160;<=
;m=
ailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com>=
;> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;<mail=
to:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com> &=
lt;mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com&g=
t;>> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160;<mailto:gregimirsky=40gmail.com <mail=
to:gregimirsky=40gmail.com> >&=23160; &=23160; &=23160;<mailto=
:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com>>=
 <mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com&g=
t; >&=23160; &=23160; &=23160;<mailto:gregimirsky=40gmail.com <=
;m=
ailto:gregimirsky=40gmail.com>>>> >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
;>>> >&=23160; &=23160; &=23160; &=23160;<mailto:gregimirsky=
=40gmail.com <mailto:gregimirsky=40gmail.com> <mailto:gregimir=
sky=40gmail.com <mailto:gregimirsky=40gmail.com>> >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160;<mailto:gregimirsky=
=40gmail.com <mailto:gregimirsky=40gmail.com> <mailto:gregimir=
sky=40gmail.com <mailto:gregimirsky=40gmail.com>>> >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160;<mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40=
gmail.com> >&=23160; &=23160; &=23160;<mailto:gregimirsky=40gm=
ail.com <mailto:gregimirsky=40gmail.com>> >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160;<mailto:gregimirsky=40gmail.c=
om <mailto:gregimirsky=40gmail.com> >&=23160; &=23160; &=23=
160;<mailto:gregimirsky=40gmail.com <mailto:gregimirsky=40gmail.com=
>>>>>> wrote: >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>> &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; =
&=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60;Hi Anoop, et al., >&=23160; &=23160; &=23160; >&=23160; &=23160;=
 &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160;I agree with your >&=23160; &=23160; &=2316=
0;understanding >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160;of what is >&=23160; &=23160; &=23160; >&=23160; &=23160; &=231=
60; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160;being defined in the current >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160;version >&=23160; &=23160; &=231=
60; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;of the &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160;=
 &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60;B=46D over VxLAN >&=23160; &=23160; &=23160;specification. >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160;But, as I >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160;=
 &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;unders=
tand, the WG is >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160;discussing the scope >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160;before the WGLC is closed. I >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160;believe there >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;are th=
ree options: >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160; >>>> >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
;>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; 1. single B=46D =
session >&=23160; &=23160; &=23160;between >&=23160; &=23160; &=231=
60; >&=23160; &=23160; &=23160;two VTEPs >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=
gt;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; 2. single B=46D session=
 >&=23160; &=23160; &=23160;per VNI >&=23160; &=23160; &=23160; >=
;&=23160; &=23160; &=23160;between >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160;two VTEPs >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160;=
 &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; 3. mu=
ltiple B=46D >&=23160; &=23160; &=23160;sessions per >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160;VNI between >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160;two VTEPs >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>> >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;The current tex=
t >&=23160; &=23160; &=23160;reflects =232. Is WG >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;a=
ccepts >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160;this scope=3F If not, which >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160;option WG would >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=
gt;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160;accept=3F >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >>>> >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160;Regards, >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>=
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160;Greg >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&g=
t;>> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160;On Tue, Oct 22, 2019 at >&=23160; &=23160; &=23160;2:=
09 PM >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;Anoop =
>&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160;Ghanwani >&=23160; &=23160; &=23160;<anoop=40alumni.duke.edu &l=
t;=
mailto:anoop=40alumni.duke.edu> <mailto:anoop=40alumni.duke.edu <mailto:anoop=40alumni.duke.edu>> >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160;<mailto:anoop=40alumni.duke.edu &=
lt;mailto:anoop=40alumni.duke.edu> <mailto:anoop=40alumni.duke.edu<=
/a> <mailto:anoop=40alumni.duke.edu>>> >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;&=
lt;mailto:anoop=40alumni.duke.edu <mailto:anoop=40alumni.duke.edu&=
gt; >&=23160; &=23160; &=23160;<mailto:anoop=40alumni.duke.edu &l=
t;=
mailto:anoop=40alumni.duke.edu>> <mailto:anoop=40alumni.duke.edu=
 <mailto:anoop=40alumni.duke.edu> >&=23160; &=23160; &=231=
60;<mailto:anoop=40alumni.duke.edu <mailto:anoop=40alumni.duke.edu<=
/a>>>>> >&=23160; &=23160; &=23160; >&=23160; &=23160; =
&=23160; >&=23160; &=23160; &=23160; >>>> >&=23160; &=23=
160; &=23160; &=23160;<mailto:anoop=40alumni.duke.edu <mailto:anoop=
=40alumni.duke.edu> <mailto:anoop=40alumni.duke.edu <mailto:=
anoop=40alumni.duke.edu>> >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160;<mailto:anoop=40alumni.duke.edu <mailto:anoop=
=40alumni.duke.edu> <mailto:anoop=40alumni.duke.edu <mailto:=
anoop=40alumni.duke.edu>>> >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;<mailto:anoop=
=40alumni.duke.edu <mailto:anoop=40alumni.duke.edu> >&=231=
60; &=23160; &=23160;<mailto:anoop=40alumni.duke.edu <mailto:anoop=40=
alumni.duke.edu>> >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160;<mailto:anoop=40alumni.duke.edu <mailto:anoop=40alu=
mni.duke.edu> >&=23160; &=23160; &=23160;<mailto:anoop=40alumn=
i.duke.edu <mailto:anoop=40alumni.duke.edu>>>>>>=
 wrote: >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
;&=23160; &=23160; &=23160; >>>> >&=23160; &=23160; &=2316=
0; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>=
>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;I conc=
ur with Joel's >&=23160; &=23160; &=23160;assessment >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0;with the >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160;=
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&=23160; &=23160; &=23160; &=23160;following >&=23160; &=23160; &=2316=
0;clarifications. >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>> >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60;The current document >&=23160; &=23160; &=23160;is already >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160;capable >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160;of monitoring >&=23160; &=23=
160; &=23160;multiple VNIs >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160;between VTEPs. >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >>>> >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160;The issue under >&=23160=
; &=23160; &=23160;discussion >&=23160; &=23160; &=23160; >&=23160;=
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160; &=23160; >&=23160; &=23160; &=23160;do we >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
;>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
;use B=46D to monitor >&=23160; &=23160; &=23160;multiple >&=23160;=
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=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
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160; &=23160; &=23160; >&=23160; &=23160; &=23160;pair of >&=23160;=
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=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160;VTEPs.&=23160; The use case for >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160;this is not >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=
gt;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;clear =
to me, as from my >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160;understanding, >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160;we cannot have a >&=23160; =
&=23160; &=23160;situation with >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160;multiple >&=23160; =
&=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
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&=23160; &=23160;VNI--there is 1:1 >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;mapping between =
VAP >&=23160; &=23160; &=23160;and VNI. >&=23160; &=23160; &=23160;=
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t;> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160;Anoop >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>> &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; =
&=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160;On Tue, Oct 22, 2019 >&=23160; &=23160; &=23160;a=
t 6:06 AM >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160;Joel M. >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>=
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;Halpern >=
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m <mailto:jmh=40joelhalpern.com>> >&=23160; &=23160; &=23=
160;<mailto:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.com>=
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=23160; &=23160; &=23160;<mailto:jmh=40joelhalpern.com <mailto:jmh=40joel=
halpern.com> >&=23160; &=23160; &=23160;<mailto:jmh=40joelhalper=
n.com <mailto:jmh=40joelhalpern.com>> <mailto:jmh=40joelhalper=
n.com <mailto:jmh=40joelhalpern.com> >&=23160; &=23160; &=231=
60;<mailto:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.com>>=
;>> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160; >>>> >&=23160; &=23160; &=23=
160; &=23160;<mailto:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.com> <mailto:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.com&=
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to:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.com> <mailto:=
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;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160;<mailto:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.=
com> >&=23160; &=23160; &=23160;<mailto:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.com>> <mailto:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.com> >&=23160; &=23160; &=23160;<<=
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o:jmh=40joelhalpern.com <mailto:jmh=40joelhalpern.com>>>&=
gt;>> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;=
wrote: >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
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; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=
gt;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160;&=23160;=46rom what I can >&=23160; &=23160; &=23160;tell,=
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160; &=23160;are two >&=23160; &=23160; &=23160; >&=23160; &=23160;=
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t;&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=
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160; &=23160; &=23160; &=23160; &=23160; &=23160;The document we >&=23=
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160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160;monitoring >&=23160; &=23160; &=23160;do=
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160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160;need for that >&=23160=
; &=23160; &=23160;document to >&=23160; &=23160; &=23160; >&=23160=
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160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160;multiple VNI case. >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&g=
t;>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
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=23160; &=23160;If folks want a >&=23160; &=23160; &=23160; >&=2316=
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&=23160;B=46D monitoring >&=23160; &=23160; &=23160;of things >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160;behind the >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;VTEPs (mu=
ltiple >&=23160; &=23160; &=23160;VNIs), >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160;then do >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;that >&=231=
60; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160;as a separate >&=23160; &=23160; &=2316=
0; >&=23160; &=23160; &=23160;document.&=23160; &=23160;The >&=2316=
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160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160;encoding will be >&=23160; &=23160; &=23=
160;a tenant >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160=
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>&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>=
;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160;and thus >&=23160; &=23160; &=23160;sesparate from >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160;what is >&=23160;=
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60; &=23160; &=23160; &=23160;defined in this >&=23160; &=23160; &=231=
60;document. >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160=
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=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
;>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160;Yours, >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;Joel &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; =
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160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
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60; &=23160; >&=23160; &=23160; &=23160;Jeffrey >&=23160; &=23160; =
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s >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160;=
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&=23160; &=23160; &=23160; &=23160; &=23160;wrote: >&=23160; &=23160; =
&=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &g=
t;>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160;> Santosh and >&=23160; &=23160; &=23160;others=
, >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160;=
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160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&g=
t;>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160;> On Thu, Oct >&=23160; &=23160; &=23160;03, 2019 a=
t >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160;07:50:20PM >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
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160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160;>>&=23160; &=23160; &=23160;Thanks >&=23=
160; &=23160; &=23160;for your >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160; >&=23160; &=23160; &=23160;explanation. >&=2316=
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60; &=23160; &=23160; &=23160;This helps a lot. I >&=23160; &=23160; &=
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60; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160;=
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&=23160; &=23160; &=23160; &=23160; &=23160;>> comments from >&=23=
160; &=23160; &=23160;others >&=23160; &=23160; &=23160; >&=23160; =
&=23160; &=23160;to see if >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23=
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60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;this wh=
at we >&=23160; &=23160; &=23160;need in this >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;draft t=
o be >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
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160; >&=23160; &=23160; &=23160;in the >&=23160; &=23160; &=23160; =
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0; &=23160;draft. >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;> >&=23160=
; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; =
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160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160;> The threads on the >&=23160; &=2316=
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160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160;spidered to the >&=23160; &=23160; &=23160;point =
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=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160;challenging >&=23160; &=23160;=
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160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
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160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; =
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=23160; &=23160; &=23160; &=23160;of the draft is, >&=23160; &=23160; =
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160; >&=23160; &=23160; &=23160;be.&=23160; :-) >&=23160; &=23160; =
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t;>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160;> >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;> Ho=
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60;followed things >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; =
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=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;properly, th=
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gt;&=23160; &=23160; &=23160;below is >&=23160; &=23160; &=23160; >=
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;&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160;really the >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;> hinge point=
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160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160;encapsulation >&=23160; &=23160; &=23160;for B=46D >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160;over vxlan >&=231=
60; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160;should look like. >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&g=
t;>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160;> Correct=3F >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
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=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160;> Essentially, >&=23=
160; &=23160; &=23160;do we or >&=23160; &=23160; &=23160; >&=23160=
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quire the >&=23160; &=23160; &=23160;ability to >&=23160; &=23160; =
&=23160; >&=23160; &=23160; &=23160;permit >&=23160; &=23160; &=231=
60; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>=
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=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160;multiple B=46D >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; =
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=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>=
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=23160;distinct VAPs=3F >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;> &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; =
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160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160;> If this is so, >&=23160; &=
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160; >&=23160; &=23160; &=23160;sense >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>=
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t; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160=
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0; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
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160; &=23160;below...=5D >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;> &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; =
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160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160;>> Santosh P K >&=23160; =
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160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
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160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23=
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; >&=23160; &=23160; &=23160; &=23160;<mailto:xiao.min2=40zte.com.cn <mailto:xiao.min2=40zte.com.cn> <mailto:xiao.min2=40zte.com.cn<=
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t;>> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
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0; &=23160; &=23160;<mailto:xiao.min2=40zte.com.cn <mailto:xiao.min2=40=
zte.com.cn>>>>>> >&=23160; &=23160; &=23160; >=
;&=23160; &=23160; &=23160;wrote: >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0;>> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160;=
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&=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>>> Hi Sant=
osh, >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
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160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160;>>> >&=23160; &=23160; &=23160; >=
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;&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160;>>> With regard >&=23160; &=23160; &=23160;to the >=
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160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160;whether we >&=23160; &=23160; &=2316=
0;should allow >&=23160; &=23160; &=23160; >&=23160; &=23160; &=231=
60; >&=23160; &=23160; &=23160;multiple B=46D >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&g=
t;>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160;sessions >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>>=
;> for the same >&=23160; &=23160; &=23160;VNI or >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160;not, >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;IMHO we=
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0; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; =
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=23160; &=23160; &=23160; &=23160; &=23160;should allow it, >&=23160; =
&=23160; &=23160;more >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160;explanation as >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160;>>> follows. >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&g=
t;>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160;>>> >&=23160; &=23160; &=23160; >&=23160; =
&=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160;=
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&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;&g=
t;>> Below is a >&=23160; &=23160; &=23160;figure >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160;derived from >&=23160; =
&=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
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C8014 (An >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160;Architecture for >&=23160; &=23160; &=231=
60; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>=
;>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160;>>> Data-Center >&=23160; &=23160; &=23160;Netwo=
rk >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >>>> &=23160;Virtualization >&=2316=
0; &=23160; &=23160;over Layer 3 >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160; >&=23160; &=23160; &=23160;(NVO3)). >&=23160;=
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=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160;>>> >&=23160; &=23160; &=23160;=
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t;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160;>>> >&=23160; &=23160; &=23160; &=23160; &=23160;=
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0; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;&=23160;=
Data Center Network >&=23160; &=23160; &=23160; >&=23160; &=23160; =
&=23160;(IP)&=23160; &=23160; &=23160; &=23160; =7C >&=23160; &=23160;=
 &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160;>>> >&=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; =7C >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>> >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>>=
;> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160; >>>> >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=23160;+-=
----------------------------------------+ >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>=
;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160;>>> >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160;=7C >&=23160; &=23160;=
 &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;>>> >&=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
=7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160;>>> >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160;&=23160;Tunnel Overl=
ay >&=23160; &=23160; &=23160; &=23160; &=23160; =7C >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160;>>> >&=23160; &=23160; &=23160; >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>=
; >&=23160; &=23160; &=23160; &=23160;+------------+---------+ >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >>>> >&=23160; &=23160; &=23160; &=23160;&=231=
60;+---------+------------+ >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>=
;>> &=23160; &=23160; &=23160; &=23160; =7C >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
;>>> >&=23160; &=23160; &=23160; &=23160;+----------+-------+=
 =7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; >>>> >&=23160;=
 &=23160; &=23160; &=23160;+-------+----------+ =7C >&=23160; &=23160;=
 &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160;>>> >&=23160; &=23160; &=23160;=7C =7C &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;Overlay >&=
=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160;Module&=23160; =7C =7C >&=23160; &=
=23160; &=23160; &=23160;=7C =7C >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160;Overlay >&=23160; &=23160; &=23160; >&=23160; =
&=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;Mo=
dule&=23160; =7C =7C >&=23160; &=23160; &=23160; >&=23160; &=23160;=
 &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>>&g=
t; &=23160; &=23160; &=23160; &=23160; =7C >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&g=
t;> >&=23160; &=23160; &=23160; &=23160;+---------+--------+ =7C &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>> >&=23160; &=23160=
; &=23160; &=23160;+---------+--------+ =7C >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=
gt;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160;>>> &=23160; &=23160; &=23160; &=23160; =7C >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160;&=23160; &=23160; =7C=
 &=23160; &=23160;=7C >&=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; &=23160; &=23160; =7C >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160;>>> &=23160;NVE1&=23160; &=23160;=7C &g=
t;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;&=23160; &=23160=
; =7C &=23160; &=23160;=7C >&=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; &=23160; &=23160; =7C >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160;NVE2 >&=23160; &=23160; &=23160; >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>&g=
t;&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160;>>> &=23160; &=23160; &=23160; &=23160; =7C >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >>>> >&=23160; &=23160; &=23160; &=23160;+--------=
+-------+&=23160; =7C >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160;=7C >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>=
> >&=23160; &=23160; &=23160; &=23160;+--------+-------+&=23160; =7C=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160;>>> >&=23160; &=23=
160; &=23160;=7C&=23160; =7CVNI1 >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160; >&=23160; &=23160; &=23160;VNI2&=23160; VNI1 >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160;=7C&=23160; =7C &=23160;=7C&=23160=
; =7C VNI1 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;V=
NI2 VNI1 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &g=
t;&=23160; &=23160; &=23160;=7C&=23160; =7C >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=
gt;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160;>>> &=23160; &=23160; &=23160; &=23160; =7C >&=23=
160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >>>> >&=23160; &=23160; &=23160; &=23160;+-+--=
---+----+---+&=23160; =7C >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160;=7C >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=
gt;> >&=23160; &=23160; &=23160; &=23160;+-+-----+-----+--+&=23160;=
 =7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160;>>> >&=23160; &=23=
160; &=23160;=7CVAP1=7C >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160;VAP2=7C&=23160; &=23160; =7C >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>=
>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160;VAP3 =7C >&=23160; &=23160; &=23160; &=23160;=7CVAP1=7C VAP2=
=7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; &=23160;=7C VAP3=7C >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&g=
t;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160;>>> >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>>> >&=23160=
; &=23160; &=23160; &=23160;+----+-----+----+------+ >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>>>> >&=23160; &=23160; &=23160; &=23160;&=23160;+----+---=
--+-----+-----+ >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>>> >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=23160;=7C&=23=
160; &=23160; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; &=23160; =7C >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>> &=23160; &=23160; &=23160; &=23160;=7C >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; &=23160;=7C&=23160; &=231=
60; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>>> >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=23160;=7C&=23=
160; &=23160; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; &=23160; =7C >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>> &=23160; &=23160; &=23160; &=23160;=7C >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; &=23160;=7C&=23160; &=231=
60; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>>> >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=23160;=7C&=23=
160; &=23160; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; &=23160; =7C >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>> &=23160; &=23160; &=23160; &=23160;=7C >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; &=23160;=7C&=23160; &=231=
60; &=23160;=7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>>> >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160; >>>> >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; > >&=23160; &=23160; &=23160; &=23160;------=
-+-----+----+-------------------+-----+-----+------- >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
>>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160;>>> >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; &=23160;=7C&=23160; &=23160; &=23160;=7C >&=231=
60; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160=
; &=23160; &=23160; =7C >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; >>>> &=23160;Tena=
nt&=23160; &=23160; &=23160; &=23160; =7C >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; &=23160;=7C&=23160; &=23160; &=23160;=7C &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160;=
 &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160;>>> >&=23160; &=23160;=
 &=23160;TSI1 =7C >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160;TSI2=7C&=23160; &=23160; =7C >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0;TSI3 >&=23160; &=23160; &=23160;TSI1=7C TSI2=7C >&=23160; &=23160=
; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; =
&=23160;=7CTSI3 >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>>> >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;+---+ +---+ >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=
=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160;+---+ >&=23160; &=23160; &=2316=
0; &=23160;+---+ >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160;+---+ >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160; &=23160;+---+ >&=23160; &=23160; &=23160=
; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>&=
gt;>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160;>>> >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160;=7CTS1=7C =7CTS2=7C >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0;=7CTS3=7C >&=23160; &=23160; &=23160; &=23160;=7CTS4=7C >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160;=7CTS5=7C >&=23160; &=
=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; &=23160;=7CTS6=7C >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>>=
> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;+---+ +=
---+ >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160;+---+ >&=23160; &=23160; =
&=23160; &=23160;+---+ >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160;+---+ >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; &=23160;+---+ >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
;>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160;>>> >&=23160; &=23160; &=23160; >&=2316=
0; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
;>>> To my >&=23160; &=23160; &=23160; >&=23160; &=23160; =
&=23160;understanding, the B=46D >&=23160; &=23160; &=23160; >&=231=
60; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0;sessions between >&=23160; &=23160; &=23160;NVE1 >&=23160; &=2316=
0; &=23160; >&=23160; &=23160; &=23160;and NVE2 are >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160=
; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160;actually >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
>>> initiated and >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160;terminated >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160;at VAP >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
;>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160;of NVE. >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >>>>&=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;>>=
;> >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160; >>>>&=23160; &=23160; &=23160; &=23=
160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=231=
60; &=23160; &=23160; &=23160; &=23160; &=23160;>>> If the >&=
=23160; &=23160; &=23160;network operator >&=23160; &=23160; &=23160; =
>&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;want to >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >>>>&=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160;set up one B=46D >&=23160; &=23160=
; &=23160;session >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23=
160;between >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;=
 >&=23160; &=23160; &=23160;VAP1 of >&=23160; &=23160; &=23160; >=
;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>&g=
t;&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
 &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160;>>> NVE1 and VAP1of >&=23160; &=23160; &=23160; >&=
=23160; &=23160; &=23160;NVE2, at the >&=23160; &=23160; &=23160; >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>=
;&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160;same time >&=23160; &=23160; &=23160;another B=46D >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160;session >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=2316=
0; >>>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160;between VAP3 of >&=23160; &=23160; &=23160; &=
gt;&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>=
>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160;>>> NVE1 and >&=23160; &=23160; &=23160;VAP3 of NVE=
2, >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160;although >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>&=2316=
0; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160=
; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160;=
the two B=46D sessions >&=23160; &=23160; &=23160; >&=23160; &=2316=
0; &=23160;are for >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >&=23160; &=23160; &=23160;the same >&=23160; &=23160; &=23=
160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&g=
t;>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160;>>> VNI1, I >&=23160; &=23160; &=23160;believ=
e it's >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >=
&=23160; &=23160; &=23160;reasonable, >&=23160; &=23160; &=23160; >=
&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>>=
;&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; =
&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160;so that's why I >&=23160; &=23160; &=23160;think we >&=23160=
; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; =
&=23160;should allow it >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; >>>> >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=
=23160; >>>> >&=23160; &=23160; &=23160; >&=23160; &=23=
160; &=23160; >&=23160; &=23160; &=23160; &=23160;=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F >&=23160; &=23160; &=231=
60; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >>=
;>>&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=
=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23160; &=23=
160; &=23160;nvo3 mailing list >&=23160; &=23160; &=23160; >&=23160=
; &=23160; &=23160; >&=23160; &=23160; &=23160; >>>> nvo3=40ietf.org=
 <m=
ailto:nvo3=40ietf.org> <mailto:nvo3=40ietf.org <mailto:nvo3=40ietf.org&g=
t;> >&=23160; &=23160; &=23160;<mailto:nvo3=40ietf.org <mailto:nvo3=40ietf.org<=
/a>> <mailto:nvo3=40ietf.org <mailto:nvo3=40ietf.org>>> >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160;<mailto:nvo3=40ietf.org <=
;mailto:nv=
o3=40ietf.org> <mailto:nvo3=40ietf.org <mailto:nvo3=40ietf.org>> &g=
t;&=23160; &=23160; &=23160;<mailto:nvo3=40ietf.org <mailto:nvo3=40ietf.org>=
 <mailt=
o:nvo3=40ietf.org <mailto:nvo3=40ietf.org>>>> <mailto:nvo3=40ietf.org<=
/a> <ma=
ilto:nvo3=40ietf.org> >&=23160; &=23160; &=23160;<mailto:nvo3=40ietf.o=
rg <mailto:nvo3=40ietf.org>> >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160;<mailto:nvo3=40ietf.org <mailto:nvo3=40ietf.org> <mailto:nvo3=40=
ietf.org <mailto:nvo3=40ietf.org>>> >&=23160; &=23160; &=231=
60; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160;<mailto:nvo3=40=
ietf.org <mailto:nvo3=40ietf.org> <mailto:nvo3=40ietf.org <mailto:nvo3=40ietf.o=
rg>> >&=23160; &=23160; &=23160;<mailto:nvo3=40ietf.org <mailto:nvo3=40=
ietf.org> <mailto:nvo3=40ietf.org <mailto:nvo3=40ietf.org>>>>&=
gt; >&=23160; &=23160; &=23160; >&=23160; &=23160; &=23160; >&=23=
160; &=23160; &=23160; >>>> https://www.ietf.org/ma=
ilman/listinfo/nvo3 >&=23160; &=23160; &=23160; >&=23160; &=231=
60; &=23160; >&=23160; &=23160; &=23160; >>>> >&=23160;=
 &=23160; &=23160; >&=23160; &=23160; &=23160; > >&=23160; &=231=
60; &=23160; > >


















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From: Anoop Ghanwani 
Date: Tue, 29 Oct 2019 23:10:16 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Dinesh Dutt 
Cc: "Joel M. Halpern" , Santosh P K ,  Greg Mirsky , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Dinesh,

Your earlier comment was about silicon, that's why I discussed only the
trapping issue.  As far as software goes, IP stacks would typically discard
packets received from a non-loopback interface if the packet's address is
in 127/8.  I am not sure a traditional IP stack can play here because even
on Tx, we have the same MAC for reaching all remote VTEPs.  It seems to me
the BFD module would have to be working directly with L2 frames coming off
the tunnel.  Kind of like if we were running LLDP between the VTEPs.

Thanks,
Anoop

On Tue, Oct 29, 2019 at 10:02 PM Dinesh Dutt  wrote:

> Trapping to the CPU would be fine based on MAC DA. But once there, a
> self-respecting network stack would look at the IP header to decide what to
> do. Ignoring it on receive may not be an option,
>
> Dinesh
> On Oct 30, 2019, 10:26 AM +0530, Anoop Ghanwani ,
> wrote:
>
> Hi Dinesh,
>
> What would break?  If messages are trapped to CPU based on the MAC DA,
> what is the problem?
>
> On the flip side, there are implementations running BFD today which use
> different addresses as specified here:
> http://www.openvswitch.org/support/dist-docs/vtep.5.html
> >>>
>
>        *b**f**d**_**c**o**n**f**i**g**_**l**o**c**a**l* *:* *b**f**d**_**d**s**t**_**i**p*: optional string
>               Set to an IPv4 address to set the IP address that is expected as
>               destination   for   received   BFD   packets.   The  default  is
>               *1**6**9**.**2**5**4**.**1**.**0*.
>
> >>>
>
> Thanks,
> Anoop
>
> On Tue, Oct 29, 2019 at 7:01 PM Dinesh Dutt  wrote:
>
>> I suspect silicon implementations will have a problem with saying that
>> they can be set to anything and MUST be ignored on reception. Your logic is
>> sound, it's just that I fear you'll break many existing implementations. I
>> recommend sticking with the 127/8 address for this case.
>>
>> Dinesh
>>
>> On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern 
>> wrote:
>>
>> In all the discussion about what VNI to use and multiple VNI support, I
>> lsot track. Sorry. Still, the earlier documents did not specify the IP to
>> use. That does NOT mean that we are required in later revisions of the
>> document to allow anything the client wants. Having said that, we could add
>> text saying that since the IP address in the BFD request in VNI 0 is
>> effectively meaningless, it can be set to any value on transmission and
>> must be ignored on reception. As far as I can tell, it is definitional that
>> the VtEP does not have any assigned IP address for VNI 0, so we can't
>> expect that address. Yours, Joel On 10/29/2019 11:10 AM, Anoop Ghanwani
>> wrote:
>>
>> Hi Joel, Yes, existing implementations use VNI 0 for BFD over VXLAN.
>> Here are a couple of references:
>> https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html
>> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665
>> I guess this document has been evolving and I have not kept up with it. The
>> version I had reviewed and commented on originally allowed for VNI 0.  The
>> -04 version of the draft has this:
>> https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7 What
>> version are you referring to? Thanks, Anoop On Mon, Oct 28, 2019 at 12:55
>> PM Joel M. Halpern > >> wrote: You are saying that there are existing
>> implementations using VNI 0 for this?  Given that previous versions of the
>> spec explicitly disallowed VNI 0, I am having trouble with your objecting
>> that a spec for how to run over VNI 0 breask existing implementations. Note
>> that when there is a good technical reason, the IETF does change Internet
>> Drafts in ways that break early implementations.  That is the price of
>> standardization. Yours, Joel On 10/28/2019 2:30 PM, Anoop Ghanwani wrote: >
>> Hi Joel, > > Writing the spec in that way would make the current,
>> inter-operable > implementation of multiple vendors non-compliant with the
>> spec. > > Thanks, > Anoop > > On Mon, Oct 28, 2019 at 11:07 AM Joel M.
>> Halpern > > > >  >>>
>> wrote: > >     I assumed this was only for the case where a tenant VNI was
>> being used. > >     For the 0 VNI (which is what I prefer), always (MUST)
>> use the loopback >     address.  There are no addresses assigned to the
>> VTEP in that space. >     There is no IRB in that space. > >     Yours, >
>>    Joel > >     On 10/28/2019 1:58 PM, Anoop Ghanwani wrote: >      > Joel,
>> >      > >      > Are we going to qualify this by VNI?  There's a bunch of
>> >     implementations >      > out there that don't use a tenant IP or a
>> loopback with VNI 0--they >      > simply repeat the underlay IP in the
>> inner IPDA. >      > >      > Thanks, >      > Anoop >      > >      > On
>> Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern >     > > <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >> >      > <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com > <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >>>> wrote: >      > >
>>     >     I can live with saying that you SHOULD use loopback, and MAY >
>>  instead >      >     use >      >     an IP address in the customer space
>> known to be owned by the VTEP >      >     device >      >     when such
>> exists. >      > >      >     Yours, >      >     Joel >      > >      >
>>  On 10/28/2019 1:32 PM, Anoop Ghanwani wrote: >      >      > Hi Joel, >
>>   >      > >      >      > Perhaps we need to say use of an address owned
>> by the device >      >     containing >      >      > the VTEP. >      >
>>   > >      >      > Or are you suggesting that the use of the loopback
>> address >     space >      >     is a MUST? >      >      > >      >      >
>> Anoop >      >      > >      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel
>> M. Halpern >      >     > > 
>> >> >     <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com > <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >>> >      >      > <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com > <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >> >     <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com > <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >>>>> wrote: >      >
>>   > >      >      >     There is something I am missing in your assumption
>> >     about IRB. >      >      > >      >      >     As I understand VxLAN,
>> the VTEP is under the control >     of the >      >     operator. >      >
>>     >     As such, it is a pure bridge.  If you run IRB behind >     it,
>> that >      >     is fine. >      >      >     Yes, an operator may offer
>> IRB.  But as I understand it, >      >     conceptually, >      >      >
>>  in terms of the VxLAN architecture the IRB is an entity >      >
>>  behind the >      >      >     VTEP, >      >      >     not part of the
>> VTEP. >      >      > >      >      >     Yours, >      >      >     Joel
>> >      >      > >      >      >     On 10/28/2019 12:23 PM, Anoop Ghanwani
>> wrote: >      >      >      > Santosh, >      >      >      > >      >
>> >      > Does it have to be a MUST?  What if I am running >     IRB and
>> there >      >      >     are IP >      >      >      > addresses per VNI
>> assigned to the VTEPs? Why can the >      >     operator not >      >
>> >      > choose to use those? >      >      >      > >      >      >      >
>> Anoop >      >      >      > >      >      >      > On Mon, Oct 28, 2019 at
>> 7:51 AM Santosh P K >      >      >      > > > >
>>     <
>> mailto:santosh.pallagatti@gmail.com >> >
>>     >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >>> >
>>     >      >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >> >
>>     >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >>>>
>> >      >      >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >> >
>>     >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >>> >
>>     >      >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >> >
>>     >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >>>>>>
>> wrote: >      >      >      > >      >      >      >     Dinesh, Anoop et
>> all, >      >      >      >           Lets us know if this text works for
>> 127/8 >      >     address range? >      >      >      > >      >      >
>>   >     [proposed text for firewall] >      >      >      > >      >
>> >      >     "As per section 4 inner destination IP address >     MUST be
>> >      >     set to >      >      >     127/8 >      >      >      >
>>  address. There may be firewall configured on >     VTEP to >      >
>>  block 127/8 >      >      >      >     address range if set as destination
>> IP in inner IP >      >     header. It is >      >      >      >
>>  recommended to allow 127/8 range address through >      >     firewall
>> only if >      >      >      >     127/8 IP address is set as destination
>> address >     in inner IP >      >      >     header." >      >      >
>> > >      >      >      > >      >      >      >     In section 4 we are
>> talking about using 127/8 >     and not >      >     really >      >
>> >     giving >      >      >      >     reason why. I think we should have
>> text as RFC 5884 >      >     has mentioned >      >      >      >     with
>> below text. >      >      >      > >      >      >      >     [From RFC
>> 5884] >      >      >      >     "The motivation for using the address
>> range >     127/8 is >      >     the same as >      >      >      >
>>  specified in Section 2.1 of [RFC4379] >      >      >      >  <
>> https://tools.ietf.org/html/rfc4379#section-2.1>. >      >     This is
>> an >      >      >      >     exception to the behavior defined in [RFC1122
>> >      >      >      >     ]." >
>>   >      >      > >      >      >      > >      >      >      > >      >
>>   >      >     Thanks >      >      >      >     Santosh P K >      >
>> >      > >      >      >      > >      >      >      > >      >      >
>> >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt >      >     <
>> didutt@gmail.com > <
>> mailto:didutt@gmail.com  > >> >      <
>> mailto:didutt@gmail.com > >  >>> >
>> >      >      <
>> mailto:didutt@gmail.com > >  >> >     <
>> mailto:didutt@gmail.com  > >  <
>> mailto:didutt@gmail.com >>>> >      >      >      >
>>   > > >      <
>> mailto:didutt@gmail.com >> >  > >     <
>> mailto:didutt@gmail.com  > >>> >      >     >  > <
>> mailto:didutt@gmail.com  > >> >      <
>> mailto:didutt@gmail.com > >  >>>>>>
>> wrote: >      >      >      > >      >      >      >         Looks good to
>> me Greg. I see that the text >     around >      >     the use >      >
>>   >     of the >      >      >      >         inner IP address as also
>> quite acceptable. Will >      >     you add any >      >      >      >
>>    words about the firewall? >      >      >      > >      >      >      >
>>        Dinesh >      >      >      > >      >      >      >         On Wed,
>> Oct 23, 2019 at 8:36 PM, Greg Mirsky >      >      >      >         <
>> gregimirsky@gmail.com > > >     >  > >> >      >     >  > > >  > >>> >     >  > > >  > >> >      >     >  > > >  > >>>> >      >      >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >> <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >>> >      >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >> >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >>>>>> wrote: >
>> >      >      >>         Hi Dinesh, et al., >      >      >      >>
>>  please check the updated version that >     removed the >      >      >
>>  reference to >      >      >      >>         Hypervisor in the text and
>> Figure 1. >      >      >      >> >      >      >      >>         Regards,
>> >      >      >      >>         Greg >      >      >      >> >      >
>> >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K >      >
>>   >      >>         > mailto:santosh.pallagatti@gmail.com > >
>>   <
>> mailto:santosh.pallagatti@gmail.com >> >
>>     >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >>> >
>>     >      >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >> >
>>     >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >>>>
>> >      >      >      >>  >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >> >
>>     >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >>> >
>>     >      >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >> >
>>     >     >  > > >     <
>> mailto:santosh.pallagatti@gmail.com  <
>> mailto:santosh.pallagatti@gmail.com >>>>>>
>> wrote: >      >      >      >> >      >      >      >>             Dinesh,
>> >      >      >      >>                  Please see my inline comments
>> [SPK] >      >      >      >> >      >      >      >> >      >      >
>> >>                 - In section 3, there's a sentence >     that >      >
>>    is: "BFD >      >      >      >>                 packets intended for a
>> Hypervisor >     VTEP MUST >      >      >     NOT..". I >      >      >
>>   >>                 recommend getting rid of the word >      >
>>  "Hypervisor" ashe >      >      >      >>                 logic applies to
>> any VTEP. >      >      >      >> >      >      >      >>             [SPK]
>> Thanks for comments. We will >     change this. >      >      >      >> >
>>     >      >      >>                 - You already explained the >
>>  precedence of >      >     the use of >      >      >      >>
>>    127/8 address in the inner header in >      >     MPLS. I have no >
>> >      >      >>                 specific comments in that area. I have >
>>     >     only two >      >      >      >>                 questions: >
>>   >      >      >>                    - Has anybody verified that the >
>>  use of >      >     127/8 >      >      >      >>                 address
>> (and the right MAC) works with >      >     existing >      >      >
>> >>                 implementations, including the silicon >      >
>>  ones? If this >      >      >      >>                 doesn't work there,
>> is it worth >     adding the >      >      >     possibilit >      >
>> >      >>                 y of another address, one that is >     owned >
>>     >     by the >      >      >     VTEP node? >      >      >      >> >
>>     >      >      >>                    - Do we know if Firewalls stop >
>>  such VXLAN >      >      >     packets? >      >      >      >>
>>      I ask this because VXLAN has an IP >     header >      >     and I >
>>     >      >     don't >      >      >      >>                 know if
>> firewalls stop packets >     with 127/8 >      >     in the >      >
>> >     inner >      >      >      >>                 header. If not, is it
>> worth adding a >      >     sentence to say >      >      >      >>
>>          that firewalls  allow such >     packets? The >      >     use of
>> a >      >      >      >>                 non-127/8 address may alleviate
>> >     this case >      >     as well. >      >      >      >> >      >
>> >      >>             [SPK] I think we may need to add the text >      >
>>  about firewall >      >      >      >>             as some checks in
>> firewall will be >     there if >      >     they are not >      >      >
>>     >>             already using MPLS OAM which has inner IP >      >
>>  header with >      >      >      >>             127/8 address range. >
>>   >      >      >> >      >      >      >> >      >      >      >>
>>        The rest of the draft looks good >     to me, >      >      >
>> >> >      >      >      >>                 Dinesh >      >      >      >>
>> >      >      >      >>                 On Wed, Oct 23, 2019 at 7:58 AM, >
>>    Greg Mirsky >      >      >      >>                 <
>> gregimirsky@gmail.com > > >     >  > >> >      >     >  > > >  > >>> >      >      >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >> <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >>>> >      >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >> >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >>> >      >      >
>>     <
>> mailto:gregimirsky@gmail.com > >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >> <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >>>>>> >      >
>> >      >>                 wrote: >      >      >      >>>
>>  Hi Dinesh, >      >      >      >>>                 I greatly appreciate
>> your comments. >      >     Please heave a >      >      >      >>>
>>          look at the attached copy of the >     working >      >      >
>>  version and >      >      >      >>>                 its diff to -07
>> (latest in the >     datatracker). >      >      >      >>> >      >
>> >      >>>                 Regards, >      >      >      >>>
>>  Greg >      >      >      >>> >      >      >      >>>                 On
>> Tue, Oct 22, 2019 at 9:52 PM >     Dinesh Dutt >      >      >      >>>
>>              > > >      <
>> mailto:didutt@gmail.com >> >      >     <
>> mailto:didutt@gmail.com  > >  <
>> mailto:didutt@gmail.com >>> >     <
>> mailto:didutt@gmail.com  > >  <
>> mailto:didutt@gmail.com >> >      >     <
>> mailto:didutt@gmail.com  > >  <
>> mailto:didutt@gmail.com >>>> >      >      >     <
>> mailto:didutt@gmail.com  > >  <
>> mailto:didutt@gmail.com >> >     <
>> mailto:didutt@gmail.com  > >  <
>> mailto:didutt@gmail.com >>> >      >     <
>> mailto:didutt@gmail.com  > >  <
>> mailto:didutt@gmail.com >> >     <
>> mailto:didutt@gmail.com  > >  <
>> mailto:didutt@gmail.com >>>>>> wrote: >      >      >
>>     >>> >      >      >      >>>                     I have the same
>> feeling as Anoop. >      >     Greg, can you >      >      >      >>>
>>                please point me to the latest >     draft >      >     so
>> that >      >      >     I can >      >      >      >>>
>>  quickly glance through it to be >      >     doubly sure, >      >      >
>>     >>> >      >      >      >>>                     Dinesh >      >
>> >      >>> >      >      >      >>>                     On Wed, Oct 23,
>> 2019 at 4:35 AM, >      >     Anoop Ghanwani >      >      >      >>>
>>                > > >     >  > >> >      >     >  > > >  > >>> >      >      >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu > >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >> <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu > >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >>>> >      >
>> >      >>>   <
>> mailto:anoop@alumni.duke.edu > >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >> >      >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu > <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >>> >      >      >
>>     <
>> mailto:anoop@alumni.duke.edu > >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >> >      >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu > >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
>> >      >      >>>>                     Greg, >      >      >      >>>> >
>>   >      >      >>>>                     I think the draft is fine as is.
>> >      >      >      >>>> >      >      >      >>>>                     I
>> discussion with Xiao Min was >      >     about #3 and I >      >      >
>>   >>>>                     see that as unnecessary until we >      >
>>  have a draft >      >      >      >>>>                     that explains
>> why that is >     needed in the >      >      >     context >      >
>> >      >>>>                     of the NVO3 architecture. >      >      >
>>     >>>> >      >      >      >>>>                     Anoop >      >
>> >      >>>> >      >      >      >>>>                     On Tue, Oct 22,
>> 2019 at 11:17 AM >      >     Greg Mirsky >      >      >      >>>>  <
>> gregimirsky@gmail.com > > >     >  > >> >      >     >  > > >  > >>> >      >      >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >> <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >>>> >      >
>> >      >>>> >       
>> > <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >> >      >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >>> >      >      >
>>     <
>> mailto:gregimirsky@gmail.com > >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >> >      >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com > >     <
>> mailto:gregimirsky@gmail.com  <
>> mailto:gregimirsky@gmail.com >>>>>> wrote: >
>> >      >      >>>> >      >      >      >>>>                         Hi
>> Anoop, et al., >      >      >      >>>>                         I agree
>> with your >     understanding >      >     of what is >      >      >
>> >>>>                         being defined in the current >      >
>>  version >      >      >     of the >      >      >      >>>>
>>            BFD over VxLAN >     specification. >      >     But, as I >
>>   >      >      >>>>                         understand, the WG is >
>> >     discussing the scope >      >      >      >>>>
>>  before the WGLC is closed. I >      >     believe there >      >      >
>>   >>>>                         are three options: >      >      >      >>>>
>> >      >      >      >>>>                          1. single BFD session >
>>    between >      >     two VTEPs >      >      >      >>>>
>>           2. single BFD session >     per VNI >      >     between >
>> >      >     two VTEPs >      >      >      >>>>
>> 3. multiple BFD >     sessions per >      >     VNI between >      >
>> >      >>>>                             two VTEPs >      >      >      >>>>
>> >      >      >      >>>>                         The current text >
>>  reflects #2. Is WG >      >      >     accepts >      >      >      >>>>
>>                        this scope? If not, which >      >     option WG
>> would >      >      >      >>>>                         accept? >      >
>>   >      >>>> >      >      >      >>>>                         Regards, >
>>     >      >      >>>>                         Greg >      >      >
>> >>>> >      >      >      >>>>                         On Tue, Oct 22, 2019
>> at >     2:09 PM >      >     Anoop >      >      >      >>>>
>>            Ghanwani >     > mailto:anoop@alumni.duke.edu > <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >> >      >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu > <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >>> >      >      >
>>     <
>> mailto:anoop@alumni.duke.edu > >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >> <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu > >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >>>> >      >
>> >      >>>> >       
>> > <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >> >      >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu > <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >>> >      >      >
>>     <
>> mailto:anoop@alumni.duke.edu > >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >> >      >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu > >     <
>> mailto:anoop@alumni.duke.edu  <
>> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
>> >      >      >>>> >      >      >      >>>>                             I
>> concur with Joel's >     assessment >      >      >     with the >      >
>>     >      >>>>                             following >     clarifications.
>> >      >      >      >>>> >      >      >      >>>>
>>      The current document >     is already >      >      >     capable >
>>   >      >      >>>>                             of monitoring >
>>  multiple VNIs >      >      >     between VTEPs. >      >      >      >>>>
>> >      >      >      >>>>                             The issue under >
>>  discussion >      >     was how >      >      >     do we >      >      >
>>     >>>>                             use BFD to monitor >     multiple >
>>   >     VAPs that >      >      >      >>>>                             use
>> the same VNI >     between a >      >     pair of >      >      >
>> >>>>                             VTEPs.  The use case for >      >     this
>> is not >      >      >      >>>>                             clear to me,
>> as from my >      >     understanding, >      >      >      >>>>
>>                  we cannot have a >     situation with >      >      >
>>  multiple >      >      >      >>>>                             VAPs using
>> the same >      >     VNI--there is 1:1 >      >      >      >>>>
>>                    mapping between VAP >     and VNI. >      >      >
>> >>>> >      >      >      >>>>                             Anoop >      >
>>     >      >>>> >      >      >      >>>>                             On
>> Tue, Oct 22, 2019 >     at 6:06 AM >      >      >     Joel M. >      >
>>   >      >>>>                             Halpern >      >     <
>> jmh@joelhalpern.com > <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >> >     <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com > <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >>> >      >      >     <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com > >     <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >> <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com > >     <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >>>> >      >      >
>>   >>>> >        <
>> mailto:jmh@joelhalpern.com > <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >> >      >     <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com > <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >>> >      >      >     <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com > >     <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >> <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com > >     <
>> mailto:jmh@joelhalpern.com  <
>> mailto:jmh@joelhalpern.com >>>>>> >      >
>>  wrote: >      >      >      >>>> >      >      >      >>>>
>>                   From what I can >     tell, >      >     there >      >
>>     >     are two >      >      >      >>>>
>>  separate problems. >      >      >      >>>>
>>    The document we >     have is a >      >      >     VTEP-VTEP >      >
>>     >      >>>>                                 monitoring >     document.
>> >      >     There is no >      >      >      >>>>
>>        need for that >     document to >      >      >     handle the >
>>   >      >      >>>>                                 multiple VNI case. >
>>     >      >      >>>>                                 If folks want a >
>>   >     protocol for doing >      >      >      >>>>
>>          BFD monitoring >     of things >      >      >     behind the >
>>   >      >      >>>>                                 VTEPs (multiple >
>>  VNIs), >      >     then do >      >      >     that >      >      >
>> >>>>                                 as a separate >      >     document.
>>  The >      >      >      >>>>                                 encoding
>> will be >     a tenant >      >      >     encoding, >      >      >
>> >>>>                                 and thus >     sesparate from >
>> >     what is >      >      >      >>>>
>>  defined in this >     document. >      >      >      >>>> >      >      >
>>     >>>>                                 Yours, >      >      >      >>>>
>>                                Joel >      >      >      >>>> >      >
>> >      >>>>                                 On 10/21/2019 >     5:07 PM, >
>>     >     Jeffrey >      >      >     Haas >      >      >      >>>>
>>                          wrote: >      >      >      >>>>
>>                > Santosh and >     others, >      >      >      >>>>
>>                          > >      >      >      >>>>
>>          > On Thu, Oct >     03, 2019 at >      >      >     07:50:20PM >
>>     >      >      >>>>                                 +0530, Santosh P >
>>    K wrote: >      >      >      >>>>                                 >>
>>  Thanks >     for your >      >      >     explanation. >      >      >
>>   >>>>                                 This helps a lot. I >      >
>>  would wait >      >      >     for more >      >      >      >>>>
>>                        >> comments from >     others >      >     to see if
>> >      >      >      >>>>                                 this what we >
>>  need in this >      >      >     draft to be >      >      >      >>>>
>>                              >> supported >     based on >      >     that
>> we can >      >      >      >>>>                                 provide
>> appropriate >      >     sections >      >      >     in the >      >
>> >      >>>>                                 draft. >      >      >
>> >>>>                                 > >      >      >      >>>>
>>                      > The threads on the >      >     list have >      >
>>     >      >>>>                                 spidered to the >     point
>> >      >     where it is >      >      >      >>>>
>>        challenging >      >      >      >>>>
>>  > to follow what the >      >     current >      >      >     status >
>>   >      >      >>>>                                 of the draft is, >
>>  or should >      >      >     be.  :-) >      >      >      >>>>
>>                        > >      >      >      >>>>
>>        > However, if I've >      >     followed things >      >      >
>> >>>>                                 properly, the >     question >      >
>>    below is >      >      >      >>>>
>>  really the >      >      >      >>>>                                 >
>> hinge point on >     what our >      >      >      >>>>
>>              encapsulation >     for BFD >      >     over vxlan >      >
>>     >      >>>>                                 should look like. >      >
>>     >      >>>>                                 > Correct? >      >      >
>>     >>>>                                 > >      >      >      >>>>
>>                          > Essentially, >     do we or >      >     do we
>> not >      >      >      >>>>                                 require the
>> >     ability to >      >     permit >      >      >      >>>>
>>                    multiple BFD >      >      >      >>>>
>>                > sessions between >      >     distinct VAPs? >      >
>> >      >>>>                                 > >      >      >      >>>>
>>                              > If this is so, >     do we >      >     have
>> a >      >      >     sense >      >      >      >>>>
>>            as to how we should >      >     proceed? >      >      >
>> >>>>                                 > >      >      >      >>>>
>>                      > -- Jeff >      >      >      >>>>
>>              > >      >      >      >>>>                                 >
>> [context preserved >      >     below...] >      >      >      >>>>
>>                          > >      >      >      >>>>
>>          >> Santosh P K >      >      >      >>>>
>>        >> >      >      >      >>>>                                 >> On
>> Wed, Sep >     25, 2019 >      >     at 8:10 AM >      >      >      >>>>
>> >       > > >  > >> >      >     >  > > >  > >>> >      >      >     <
>> mailto:xiao.min2@zte.com.cn  <
>> mailto:xiao.min2@zte.com.cn > >     <
>> mailto:xiao.min2@zte.com.cn  <
>> mailto:xiao.min2@zte.com.cn >> <
>> mailto:xiao.min2@zte.com.cn  <
>> mailto:xiao.min2@zte.com.cn > >     <
>> mailto:xiao.min2@zte.com.cn  <
>> mailto:xiao.min2@zte.com.cn >>>> >      >      >
>>     >>>> >      >       >  > > >  > >> >     >  > > >  > >>> >      >      >     <
>> mailto:xiao.min2@zte.com.cn  <
>> mailto:xiao.min2@zte.com.cn > >     <
>> mailto:xiao.min2@zte.com.cn  <
>> mailto:xiao.min2@zte.com.cn >> <
>> mailto:xiao.min2@zte.com.cn  <
>> mailto:xiao.min2@zte.com.cn > >     <
>> mailto:xiao.min2@zte.com.cn  <
>> mailto:xiao.min2@zte.com.cn >>>>>> >      >
>>  wrote: >      >      >      >>>>                                 >> >
>> >      >      >>>>                                 >>> Hi Santosh, >
>> >      >      >>>>                                 >>> >      >      >
>> >>>>                                 >>> >      >      >      >>>>
>>                        >>> With regard >     to the >      >     question
>> >      >      >      >>>>                                 whether we >
>>  should allow >      >      >     multiple BFD >      >      >      >>>>
>>                              sessions >      >      >      >>>>
>>                      >>> for the same >     VNI or >      >     not, >
>> >      >     IMHO we >      >      >      >>>>
>>    should allow it, >     more >      >      >     explanation as >      >
>>     >      >>>>                                 >>> follows. >      >
>> >      >>>>                                 >>> >      >      >      >>>>
>>                                >>> Below is a >     figure >      >
>>  derived from >      >      >      >>>>
>>  figure 2 of >     RFC8014 (An >      >      >     Architecture for >
>> >      >      >>>>                                 >>> Data-Center >
>>  Network >      >      >      >>>>  Virtualization >     over Layer 3 >
>>   >      >     (NVO3)). >      >      >      >>>>
>>        >>> >      >      >      >>>>                                 >>> >
>>             | >      >      >      >>>>
>>   Data Center Network >      >     (IP)        | >      >      >      >>>>
>>                                >>> >              | >      >      >
>> >>>> >      >             | >      >      >      >>>>
>>            >>> >      >      >      >>>> >      >      >
>>  +-----------------------------------------+ >      >      >      >>>>
>>                            >>> >      >             | >      >      >
>> >>>> >           | >      >      >      >>>>
>>  >>> >      >             | >      >      >      >>>>
>>             Tunnel Overlay >          | >      >      >      >>>>
>>                        >>> >      >      >      >>>> >
>>  +------------+---------+ >      >      >      >>>> >
>>   +---------+------------+ >      >      >      >>>>
>>          >>>         | >      >      >      >>>> >
>>  +----------+-------+ | >      >           | >      >      >      >>>> >
>>    +-------+----------+ | >      >      >      >>>>
>>          >>> >     | | >      >     Overlay >      >      >      >>>>
>>                            Module  | | >       | | >      >     Overlay >
>>     >      >      >>>>                                 Module  | | >
>> >      >      >>>>                                 >>>         | >      >
>>     >      >>>> >       +---------+--------+ | >      >           | >
>> >      >      >>>> >       +---------+--------+ | >      >      >
>> >>>>                                 >>>         | >      >           | >
>>     >      >      >>>>                                     |    | >
>>      | >      >      >          | >      >      >      >>>>
>>                  >>>  NVE1   | >      >           | >      >      >
>> >>>>                                     |    | >             | >      >
>>   >          | >      >      >      >>>>
>>  NVE2 >      >      >      >>>>                                 >>>
>> | >      >      >      >>>> >       +--------+-------+  | >      >
>>  | >      >      >      >>>> >       +--------+-------+  | >      >      >
>>     >>>>                                 >>> >     |  |VNI1 >      >
>> >     VNI2  VNI1 >      >      >      >>>>
>>  |  |  |  | VNI1 >      >     VNI2 VNI1 >      >      >     |  | >      >
>>     >      >>>>                                 >>>         | >      >
>> >      >>>> >       +-+-----+----+---+  | >      >           | >      >
>>   >      >>>> >       +-+-----+-----+--+  | >      >      >      >>>>
>>                            >>> >     |VAP1| >      >     VAP2|    | >
>> >      >      >>>>                                 VAP3 | >       |VAP1|
>> VAP2| >      >      >       | VAP3| >      >      >      >>>>
>>                    >>> >      >      >      >>>> >
>>  +----+-----+----+------+ >      >      >      >>>> >
>>   +----+-----+-----+-----+ >      >      >      >>>>
>>          >>> >      >       |     | >      >      >        | >      >
>> >      >>>>        | >      >       |     | >      >      >      >>>>
>>                            >>> >      >       |     | >      >      >
>>   | >      >      >      >>>>        | >      >       |     | >      >
>> >      >>>>                                 >>> >      >       |     | >
>>   >      >        | >      >      >      >>>>        | >      >       |
>>  | >      >      >      >>>>                                 >>> >      >
>>     >      >>>> >      >      > >
>>  -------+-----+----+-------------------+-----+-----+------- >      >
>> >      >>>>                                 >>> >      >       |     | >
>>   >      >        | >      >      >      >>>>  Tenant        | >      >
>>    |     | >      >      >      >>>>                                 >>> >
>>    TSI1 | >      >     TSI2|    | >      >      >      >>>>
>>                  TSI3 >     TSI1| TSI2| >      >      >       |TSI3 >
>> >      >      >>>>                                 >>> >      >     +---+
>> +---+ >      >      >      >>>>                                 +---+ >
>>    +---+ >      >     +---+ >      >      >       +---+ >      >      >
>>   >>>>                                 >>> >      >     |TS1| |TS2| >
>> >      >      >>>>                                 |TS3| >       |TS4| >
>>   >     |TS5| >      >      >       |TS6| >      >      >      >>>>
>>                          >>> >      >     +---+ +---+ >      >      >
>> >>>>                                 +---+ >       +---+ >      >     +---+
>> >      >      >       +---+ >      >      >      >>>>
>>            >>> >      >      >      >>>>
>>  >>> To my >      >     understanding, the BFD >      >      >      >>>>
>>                              sessions between >     NVE1 >      >     and
>> NVE2 are >      >      >      >>>>                                 actually
>> >      >      >      >>>>                                 >>> initiated and
>> >      >     terminated >      >      >     at VAP >      >      >
>> >>>>                                 of NVE. >      >      >      >>>>
>>                            >>> >      >      >      >>>>
>>              >>> If the >     network operator >      >      >     want to
>> >      >      >      >>>>                                 set up one BFD >
>>    session >      >     between >      >      >     VAP1 of >      >
>> >      >>>>                                 >>> NVE1 and VAP1of >      >
>>  NVE2, at the >      >      >      >>>>
>>  same time >     another BFD >      >     session >      >      >
>> >>>>                                 between VAP3 of >      >      >
>> >>>>                                 >>> NVE1 and >     VAP3 of NVE2, >
>>   >      >     although >      >      >      >>>>
>>        the two BFD sessions >      >     are for >      >      >     the
>> same >      >      >      >>>>                                 >>> VNI1, I
>> >     believe it's >      >      >     reasonable, >      >      >
>> >>>>                                 so that's why I >     think we >
>> >      >     should allow it >      >      >      >>>> >      >      >
>> >>>> >      >      >       _______________________________________________
>> >      >      >      >>>>                                 nvo3 mailing list
>> >      >      >      >>>> nvo3@ietf.org > >  <
>> mailto:nvo3@ietf.org >> >     >  > <
>> mailto:nvo3@ietf.org  > >>> >      >      <
>> mailto:nvo3@ietf.org > >  >> >     <
>> mailto:nvo3@ietf.org  > >  <
>> mailto:nvo3@ietf.org >>>> >  > >     <
>> mailto:nvo3@ietf.org  > >> >      >      <
>> mailto:nvo3@ietf.org > >  >>> >      >
>> >      > >  <
>> mailto:nvo3@ietf.org >> >     >  > <
>> mailto:nvo3@ietf.org  > >>>>> >      >      >      >>>>
>> https://www.ietf.org/mailman/listinfo/nvo3 >      >      >      >>>> >
>>     >      > >      > >
>>
>>

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From nobody Wed Oct 30 04:23:19 2019
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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
From: Jeffrey Haas 
In-Reply-To: <14104891-8e3e-ba70-4744-4e9f6d52561a@joelhalpern.com>
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Cc: Dinesh Dutt , Anoop Ghanwani , Santosh P K , Greg Mirsky , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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Joel,


> On Oct 29, 2019, at 10:08 PM, Joel M. Halpern  =
wrote:
>=20
> I presume that most silicon implementations of VxLAN VTEPs do not have =
any logic for trapping out BFD packets under any circumstances.  While =
some may have been built anticipating this draft, we have to assume that =
many will not be able to support this.  So it goes when you add features =
to a protocol.

Just to be clear, BFD itself (RFC 5880) doesn't necessarily require the =
IP portion of the stack. What's required is sufficient information for =
an implementation to manage the BFD session for the transport in =
question.

Things that tend to run IP usually end up with a bit of programming that =
tells it that the forwarding layer can trap on a given 5-tuple =
signature.  Things like BFD on LAG will catch a layer deeper in some =
circumstances such as startup.

This discussion is running rather similar (albeit more publicly) to the =
BFD on LAG discussion as various vendors try to figure out how they can =
successfully trap BFD for the testing point in question.

-- Jeff=

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Joel,


On Oct =
29, 2019, at 10:08 PM, Joel M. Halpern <jmh@joelhalpern.com>=
 wrote:

I presume that most silicon =
implementations of VxLAN VTEPs do not have any logic for trapping out =
BFD packets under any circumstances.  While some may have been =
built anticipating this draft, we have to assume that many will not be =
able to support this.  So it goes when you add features to a =
protocol.

Just to be clear, BFD itself (RFC 5880) doesn't necessarily =
require the IP portion of the stack. What's required is sufficient =
information for an implementation to manage the BFD session for the =
transport in question.

Things that tend to run IP usually end up with a bit of =
programming that tells it that the forwarding layer can trap on a given =
5-tuple signature.  Things like BFD on LAG will catch a layer =
deeper in some circumstances such as startup.

This discussion is running rather =
similar (albeit more publicly) to the BFD on LAG discussion as various =
vendors try to figure out how they can successfully trap BFD for the =
testing point in question.

-- Jeff
=

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Date: Wed, 30 Oct 2019 16:45:56 +0500
From: Dinesh Dutt 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Anoop Ghanwani 
Cc: "Joel M. Halpern" , Santosh P K , Greg Mirsky , Jeffrey Haas , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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On Wed, Oct 30, 2019 at 11:40 AM, Anoop Ghanwani 
 wrote:
> Hi Dinesh,
> 
> Your earlier comment was about silicon, that's why I discussed only 
> the trapping issue.  As far as software goes, IP stacks would 
> typically discard packets received from a non-loopback interface if 
> the packet's address is in 127/8.  I am not sure a traditional IP 
> stack can play here because even on Tx, we have the same MAC for 
> reaching all remote VTEPs.  It seems to me the BFD module would have 
> to be working directly with L2 frames coming off the tunnel.  Kind of 
> like if we were running LLDP between the VTEPs.

Hi Anoop,

My earlier comment was indeed about silicon, but the packet has to go 
through the software stack as well once it gets to the CPU. Linux-based 
solutions such as Linux servers or Cumulus Linux or maybe even SONIC 
will need to have a valid IP address to process the packet. Given that 
127/8 is already mandated by MPLS BFD, sticking with that is better 
than ignoring the IP address. This is why I agreed with Jeffrey Haas' 
comment about SHOULD be set.

Dinesh
> 
> Thanks,
> Anoop
> 
> On Tue, Oct 29, 2019 at 10:02 PM Dinesh Dutt  wrote:
>> Trapping to the CPU would be fine based on MAC DA. But once there, a 
>> self-respecting network stack would look at the IP header to decide 
>> what to do. Ignoring it on receive may not be an option,
>> 
>> Dinesh
>> On Oct 30, 2019, 10:26 AM +0530, Anoop Ghanwani 
>> , wrote:
>>> Hi Dinesh,
>>> 
>>> What would break?  If messages are trapped to CPU based on the MAC 
>>> DA, what is the problem?
>>> 
>>> On the flip side, there are implementations running BFD today which 
>>> use different addresses as specified here:
>>> http://www.openvswitch.org/support/dist-docs/vtep.5.html
>>> >>>
>>>        bfd_config_local : bfd_dst_ip: optional string
>>>               Set to an IPv4 address to set the IP address that is 
>>> expected as
>>>               destination   for   received   BFD   packets.   The  
>>> default  is
>>>               169.254.1.0.
>>> >>>
>>> 
>>> Thanks,
>>> Anoop
>>> 
>>> On Tue, Oct 29, 2019 at 7:01 PM Dinesh Dutt  
>>> wrote:
>>>> I suspect silicon implementations will have a problem with saying 
>>>> that they can be set to anything and MUST be ignored on reception. 
>>>> Your logic is sound, it's just that I fear you'll break many 
>>>> existing implementations. I recommend sticking with the 127/8 
>>>> address for this case.
>>>> 
>>>> Dinesh
>>>> 
>>>> On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern 
>>>>  wrote:
>>>>> In all the discussion about what VNI to use and multiple VNI 
>>>>> support, I lsot track. Sorry. Still, the earlier documents did 
>>>>> not specify the IP to use. That does NOT mean that we are 
>>>>> required in later revisions of the document to allow anything the 
>>>>> client wants. Having said that, we could add text saying that 
>>>>> since the IP address in the BFD request in VNI 0 is effectively 
>>>>> meaningless, it can be set to any value on transmission and must 
>>>>> be ignored on reception. As far as I can tell, it is definitional 
>>>>> that the VtEP does not have any assigned IP address for VNI 0, so 
>>>>> we can't expect that address. Yours, Joel On 10/29/2019 11:10 AM, 
>>>>> Anoop Ghanwani wrote:
>>>>>> Hi Joel, Yes, existing implementations use VNI 0 for BFD over 
>>>>>> VXLAN.  Here are a couple of references: 
>>>>>> https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html 
>>>>>> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665 
>>>>>> I guess this document has been evolving and I have not kept up 
>>>>>> with it. The version I had reviewed and commented on originally 
>>>>>> allowed for VNI 0.  The -04 version of the draft has this: 
>>>>>> https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7 
>>>>>> What version are you referring to? Thanks, Anoop On Mon, Oct 28, 
>>>>>> 2019 at 12:55 PM Joel M. Halpern >>>>> > wrote: You are saying that there 
>>>>>> are existing implementations using VNI 0 for this?  Given that 
>>>>>> previous versions of the spec explicitly disallowed VNI 0, I am 
>>>>>> having trouble with your objecting that a spec for how to run 
>>>>>> over VNI 0 breask existing implementations. Note that when there 
>>>>>> is a good technical reason, the IETF does change Internet Drafts 
>>>>>> in ways that break early implementations.  That is the price of 
>>>>>> standardization. Yours, Joel On 10/28/2019 2:30 PM, Anoop 
>>>>>> Ghanwani wrote: > Hi Joel, > > Writing the spec in that way 
>>>>>> would make the current, inter-operable > implementation of 
>>>>>> multiple vendors non-compliant with the spec. > > Thanks, > 
>>>>>> Anoop > > On Mon, Oct 28, 2019 at 11:07 AM Joel M. Halpern 
>>>>>>  > 
>>>>>> >> 
>>>>>> wrote: > >     I assumed this was only for the case where a 
>>>>>> tenant VNI was being used. > >     For the 0 VNI (which is what 
>>>>>> I prefer), always (MUST) use the loopback >     address.  There 
>>>>>> are no addresses assigned to the VTEP in that space. >     There 
>>>>>> is no IRB in that space. > >     Yours, >     Joel > >     On 
>>>>>> 10/28/2019 1:58 PM, Anoop Ghanwani wrote: >      > Joel, >      
>>>>>> > >      > Are we going to qualify this by VNI?  There's a bunch 
>>>>>> of >     implementations >      > out there that don't use a 
>>>>>> tenant IP or a loopback with VNI 0--they >      > simply repeat 
>>>>>> the underlay IP in the inner IPDA. >      > >      > Thanks, >   
>>>>>>    > Anoop >      > >      > On Mon, Oct 28, 2019 at 10:46 AM 
>>>>>> Joel M. Halpern >     >>>>>  >>>>> > >      > 
>>>>>>  
>>>>>> >>> 
>>>>>> wrote: >      > >      >     I can live with saying that you 
>>>>>> SHOULD use loopback, and MAY >     instead >      >     use >    
>>>>>>   >     an IP address in the customer space known to be owned by 
>>>>>> the VTEP >      >     device >      >     when such exists. >    
>>>>>>   > >      >     Yours, >      >     Joel >      > >      >     
>>>>>> On 10/28/2019 1:32 PM, Anoop Ghanwani wrote: >      >      > Hi 
>>>>>> Joel, >      >      > >      >      > Perhaps we need to say use 
>>>>>> of an address owned by the device >      >     containing >      
>>>>>> >      > the VTEP. >      >      > >      >      > Or are you 
>>>>>> suggesting that the use of the loopback address >     space >    
>>>>>>   >     is a MUST? >      >      > >      >      > Anoop >      
>>>>>> >      > >      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel 
>>>>>> M. Halpern >      >     >>>>>  >>>>> > >     >>>>>  >>>>> >> >      >      > 
>>>>>>  
>>>>>> > >     
>>>>>>  
>>>>>> >>>> 
>>>>>> wrote: >      >      > >      >      >     There is something I 
>>>>>> am missing in your assumption >     about IRB. >      >      > > 
>>>>>>      >      >     As I understand VxLAN, the VTEP is under the 
>>>>>> control >     of the >      >     operator. >      >      >     
>>>>>> As such, it is a pure bridge.  If you run IRB behind >     it, 
>>>>>> that >      >     is fine. >      >      >     Yes, an operator 
>>>>>> may offer IRB.  But as I understand it, >      >     
>>>>>> conceptually, >      >      >     in terms of the VxLAN 
>>>>>> architecture the IRB is an entity >      >     behind the >      
>>>>>> >      >     VTEP, >      >      >     not part of the VTEP. >   
>>>>>>    >      > >      >      >     Yours, >      >      >     Joel 
>>>>>> >      >      > >      >      >     On 10/28/2019 12:23 PM, 
>>>>>> Anoop Ghanwani wrote: >      >      >      > Santosh, >      >   
>>>>>>    >      > >      >      >      > Does it have to be a MUST?  
>>>>>> What if I am running >     IRB and there >      >      >     are 
>>>>>> IP >      >      >      > addresses per VNI assigned to the 
>>>>>> VTEPs? Why can the >      >     operator not >      >      >     
>>>>>>  > choose to use those? >      >      >      > >      >      >   
>>>>>>    > Anoop >      >      >      > >      >      >      > On Mon, 
>>>>>> Oct 28, 2019 at 7:51 AM Santosh P K >      >      >      > 
>>>>>> >>>>>  >     
>>>>>> >>>>> > >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> >> >      >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> > >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> >>> >      >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> > >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> >> >      >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> > >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> >>>>> wrote: >      >      
>>>>>> >      > >      >      >      >     Dinesh, Anoop et all, >      
>>>>>> >      >      >           Lets us know if this text works for 
>>>>>> 127/8 >      >     address range? >      >      >      > >      
>>>>>> >      >      >     [proposed text for firewall] >      >      > 
>>>>>>      > >      >      >      >     "As per section 4 inner 
>>>>>> destination IP address >     MUST be >      >     set to >      
>>>>>> >      >     127/8 >      >      >      >     address. There may 
>>>>>> be firewall configured on >     VTEP to >      >     block 127/8 
>>>>>> >      >      >      >     address range if set as destination 
>>>>>> IP in inner IP >      >     header. It is >      >      >      > 
>>>>>>     recommended to allow 127/8 range address through >      >    
>>>>>>  firewall only if >      >      >      >     127/8 IP address is 
>>>>>> set as destination address >     in inner IP >      >      >     
>>>>>> header." >      >      >      > >      >      >      > >      >  
>>>>>>     >      >     In section 4 we are talking about using 127/8 > 
>>>>>>     and not >      >     really >      >      >     giving >     
>>>>>>  >      >      >     reason why. I think we should have text as 
>>>>>> RFC 5884 >      >     has mentioned >      >      >      >     
>>>>>> with below text. >      >      >      > >      >      >      >   
>>>>>>   [From RFC 5884] >      >      >      >     "The motivation for 
>>>>>> using the address range >     127/8 is >      >     the same as 
>>>>>> >      >      >      >     specified in Section 2.1 of [RFC4379] 
>>>>>> >      >      >      >  
>>>>>> . >      >     
>>>>>> This is an >      >      >      >     exception to the behavior 
>>>>>> defined in [RFC1122 >      >      >      >     
>>>>>> ]." >      >      >      > 
>>>>>> >      >      >      > >      >      >      > >      >      >    
>>>>>>   >     Thanks >      >      >      >     Santosh P K >      >   
>>>>>>    >      > >      >      >      > >      >      >      > >      
>>>>>> >      >      >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt 
>>>>>> >      >      
>>>>>> > >     
>>>>>>  
>>>>>> >> >      >    
>>>>>>   >      
>>>>>> > >     
>>>>>>  
>>>>>> >>> >      >   
>>>>>>    >      >     >>>>>  >     >>>>> > >>>>>  >     >>>>> >> >      >     
>>>>>>  
>>>>>> > >     
>>>>>>  
>>>>>> >>>>> wrote: > 
>>>>>>      >      >      > >      >      >      >         Looks good 
>>>>>> to me Greg. I see that the text >     around >      >     the 
>>>>>> use >      >      >     of the >      >      >      >         
>>>>>> inner IP address as also quite acceptable. Will >      >     you 
>>>>>> add any >      >      >      >         words about the firewall? 
>>>>>> >      >      >      > >      >      >      >         Dinesh >   
>>>>>>    >      >      > >      >      >      >         On Wed, Oct 
>>>>>> 23, 2019 at 8:36 PM, Greg Mirsky >      >      >      >         
>>>>>>  >     
>>>>>> > >  
>>>>>>     >     >>>>>  >>>>> >> >     
>>>>>>  
>>>>>> > >  
>>>>>>     >     >>>>>  >>>>> >>> >      >      >     
>>>>>>  >   
>>>>>>   > 
>>>>>>  >   
>>>>>>   >> 
>>>>>> >      >     >>>>>  >>>>> > >     
>>>>>>  
>>>>>> >>>>> >>>>> wrote: >      >      >      
>>>>>> >>         Hi Dinesh, et al., >      >      >      >>         
>>>>>> please check the updated version that >     removed the >      > 
>>>>>>      >     reference to >      >      >      >>         
>>>>>> Hypervisor in the text and Figure 1. >      >      >      >> >   
>>>>>>    >      >      >>         Regards, >      >      >      >>     
>>>>>>     Greg >      >      >      >> >      >      >      >>         
>>>>>> On Wed, Oct 23, 2019 at 10:47 AM Santosh P K >      >      >     
>>>>>>  >>         >>>>>  >     
>>>>>> >>>>> > >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> >> >      >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> > >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> >>> >      >      >      >> 
>>>>>>  >>>>>  >     
>>>>>> >>>>> > >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> >> >      >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> > >      >     
>>>>>> >>>>>  >     
>>>>>> >>>>> >>>>> wrote: >      >      
>>>>>> >      >> >      >      >      >>             Dinesh, >      >   
>>>>>>    >      >>                  Please see my inline comments 
>>>>>> [SPK] >      >      >      >> >      >      >      >> >      >   
>>>>>>    >      >>                 - In section 3, there's a sentence 
>>>>>> >     that >      >     is: "BFD >      >      >      >>         
>>>>>>         packets intended for a Hypervisor >     VTEP MUST >      
>>>>>> >      >     NOT..". I >      >      >      >>                 
>>>>>> recommend getting rid of the word >      >     "Hypervisor" ashe 
>>>>>> >      >      >      >>                 logic applies to any 
>>>>>> VTEP. >      >      >      >> >      >      >      >>            
>>>>>>  [SPK] Thanks for comments. We will >     change this. >      >  
>>>>>>     >      >> >      >      >      >>                 - You 
>>>>>> already explained the >     precedence of >      >     the use 
>>>>>> of >      >      >      >>                 127/8 address in the 
>>>>>> inner header in >      >     MPLS. I have no >      >      >     
>>>>>>  >>                 specific comments in that area. I have >     
>>>>>>  >     only two >      >      >      >>                 
>>>>>> questions: >      >      >      >>                    - Has 
>>>>>> anybody verified that the >     use of >      >     127/8 >      
>>>>>> >      >      >>                 address (and the right MAC) 
>>>>>> works with >      >     existing >      >      >      >>         
>>>>>>         implementations, including the silicon >      >     
>>>>>> ones? If this >      >      >      >>                 doesn't 
>>>>>> work there, is it worth >     adding the >      >      >     
>>>>>> possibilit >      >      >      >>                 y of another 
>>>>>> address, one that is >     owned >      >     by the >      >    
>>>>>>   >     VTEP node? >      >      >      >> >      >      >      
>>>>>> >>                    - Do we know if Firewalls stop >     such 
>>>>>> VXLAN >      >      >     packets? >      >      >      >>       
>>>>>>           I ask this because VXLAN has an IP >     header >      
>>>>>> >     and I >      >      >     don't >      >      >      >>    
>>>>>>              know if firewalls stop packets >     with 127/8 >   
>>>>>>    >     in the >      >      >     inner >      >      >      
>>>>>> >>                 header. If not, is it worth adding a >      > 
>>>>>>     sentence to say >      >      >      >>                 that 
>>>>>> firewalls  allow such >     packets? The >      >     use of a > 
>>>>>>      >      >      >>                 non-127/8 address may 
>>>>>> alleviate >     this case >      >     as well. >      >      >  
>>>>>>     >> >      >      >      >>             [SPK] I think we may 
>>>>>> need to add the text >      >     about firewall >      >      > 
>>>>>>      >>             as some checks in firewall will be >     
>>>>>> there if >      >     they are not >      >      >      >>       
>>>>>>       already using MPLS OAM which has inner IP >      >     
>>>>>> header with >      >      >      >>             127/8 address 
>>>>>> range. >      >      >      >> >      >      >      >> >      >  
>>>>>>     >      >>                 The rest of the draft looks good > 
>>>>>>     to me, >      >      >      >> >      >      >      >>       
>>>>>>           Dinesh >      >      >      >> >      >      >      >> 
>>>>>>                 On Wed, Oct 23, 2019 at 7:58 AM, >     Greg 
>>>>>> Mirsky >      >      >      >>                 
>>>>>>  >     
>>>>>> > >  
>>>>>>     >     >>>>>  >>>>> >> >      >      >     
>>>>>>  >   
>>>>>>   > 
>>>>>>  >   
>>>>>>   >>>>> >>> >      >     
>>>>>>  
>>>>>> > >  
>>>>>>     
>>>>>> >> > 
>>>>>>      >      >     >>>>>  >     
>>>>>> > 
>>>>>>  >   
>>>>>>   >>>>> >>>>> >      >      >      >>      
>>>>>>            wrote: >      >      >      >>>                 Hi 
>>>>>> Dinesh, >      >      >      >>>                 I greatly 
>>>>>> appreciate your comments. >      >     Please heave a >      >   
>>>>>>    >      >>>                 look at the attached copy of the > 
>>>>>>     working >      >      >     version and >      >      >      
>>>>>> >>>                 its diff to -07 (latest in the >     
>>>>>> datatracker). >      >      >      >>> >      >      >      >>>  
>>>>>>                Regards, >      >      >      >>>                 
>>>>>> Greg >      >      >      >>> >      >      >      >>>           
>>>>>>       On Tue, Oct 22, 2019 at 9:52 PM >     Dinesh Dutt >      > 
>>>>>>      >      >>>                 >>>>>  >     >>>>> > >      >     >>>>>  >>>>> >> >     >>>>>  >>>>> > >      >     >>>>>  >>>>> >>> >      >      >     
>>>>>>  
>>>>>> > >     
>>>>>>  
>>>>>> >> >      >    
>>>>>>   
>>>>>> > >     
>>>>>>  
>>>>>> >>>>> wrote: > 
>>>>>>      >      >      >>> >      >      >      >>>                  
>>>>>>    I have the same feeling as Anoop. >      >     Greg, can you 
>>>>>> >      >      >      >>>                     please point me to 
>>>>>> the latest >     draft >      >     so that >      >      >     
>>>>>> I can >      >      >      >>>                     quickly 
>>>>>> glance through it to be >      >     doubly sure, >      >      
>>>>>> >      >>> >      >      >      >>>                     Dinesh > 
>>>>>>      >      >      >>> >      >      >      >>>                  
>>>>>>    On Wed, Oct 23, 2019 at 4:35 AM, >      >     Anoop Ghanwani 
>>>>>> >      >      >      >>>                     
>>>>>>  >     
>>>>>> > >  
>>>>>>     >     >>>>>  >>>>> >> >      >      >     
>>>>>>  >   
>>>>>>   > 
>>>>>>  >   
>>>>>>   >>>>> >>> >      >      >      >>>  
>>>>>>  >   
>>>>>>   > 
>>>>>> >      >     >>>>>  >>>>> >> >      >      >     
>>>>>>  >   
>>>>>>   > 
>>>>>> >      >     >>>>>  >     
>>>>>> >>>>> >>>>> wrote: >      >      >      
>>>>>> >>>>                     Greg, >      >      >      >>>> >      
>>>>>> >      >      >>>>                     I think the draft is fine 
>>>>>> as is. >      >      >      >>>> >      >      >      >>>>       
>>>>>>               I discussion with Xiao Min was >      >     about 
>>>>>> #3 and I >      >      >      >>>>                     see that 
>>>>>> as unnecessary until we >      >     have a draft >      >      
>>>>>> >      >>>>                     that explains why that is >     
>>>>>> needed in the >      >      >     context >      >      >      
>>>>>> >>>>                     of the NVO3 architecture. >      >      
>>>>>> >      >>>> >      >      >      >>>>                     Anoop 
>>>>>> >      >      >      >>>> >      >      >      >>>>              
>>>>>>        On Tue, Oct 22, 2019 at 11:17 AM >      >     Greg Mirsky 
>>>>>> >      >      >      >>>>  >>>>>  >     
>>>>>> > >  
>>>>>>     >     >>>>>  >>>>> >> >      >      >     
>>>>>>  >   
>>>>>>   > 
>>>>>>  >   
>>>>>>   >>>>> >>> >      >      >      >>>> >    
>>>>>>     
>>>>>> > >  
>>>>>>     >     >>>>>  >>>>> >> >      >      >     
>>>>>>  >   
>>>>>>   > 
>>>>>> >      >     >>>>>  >     
>>>>>> >>>>> >>>>> wrote: >      >      >      
>>>>>> >>>> >      >      >      >>>>                         Hi Anoop, 
>>>>>> et al., >      >      >      >>>>                         I 
>>>>>> agree with your >     understanding >      >     of what is >    
>>>>>>   >      >      >>>>                         being defined in 
>>>>>> the current >      >     version >      >      >     of the >    
>>>>>>   >      >      >>>>                         BFD over VxLAN >    
>>>>>>  specification. >      >     But, as I >      >      >      >>>> 
>>>>>>                         understand, the WG is >      >     
>>>>>> discussing the scope >      >      >      >>>>                   
>>>>>>       before the WGLC is closed. I >      >     believe there >  
>>>>>>     >      >      >>>>                         are three 
>>>>>> options: >      >      >      >>>> >      >      >      >>>>     
>>>>>>                      1. single BFD session >     between >      
>>>>>> >     two VTEPs >      >      >      >>>>                        
>>>>>>   2. single BFD session >     per VNI >      >     between >     
>>>>>>  >      >     two VTEPs >      >      >      >>>>                
>>>>>>           3. multiple BFD >     sessions per >      >     VNI 
>>>>>> between >      >      >      >>>>                             
>>>>>> two VTEPs >      >      >      >>>> >      >      >      >>>>    
>>>>>>                      The current text >     reflects #2. Is WG > 
>>>>>>      >      >     accepts >      >      >      >>>>              
>>>>>>            this scope? If not, which >      >     option WG 
>>>>>> would >      >      >      >>>>                         accept? 
>>>>>> >      >      >      >>>> >      >      >      >>>>              
>>>>>>            Regards, >      >      >      >>>>                    
>>>>>>      Greg >      >      >      >>>> >      >      >      >>>>    
>>>>>>                      On Tue, Oct 22, 2019 at >     2:09 PM >     
>>>>>>  >     Anoop >      >      >      >>>>                         
>>>>>> Ghanwani >     >>>>>  >>>>> > >      >     
>>>>>>  
>>>>>> >> > 
>>>>>>      >      >     >>>>>  >     
>>>>>> > 
>>>>>>  >   
>>>>>>   >>>>> >>> >      >      >      >>>> >    
>>>>>>     
>>>>>> > >  
>>>>>>     >     >>>>>  >>>>> >> >      >      >     
>>>>>>  >   
>>>>>>   > 
>>>>>> >      >     >>>>>  >     
>>>>>> >>>>> >>>>> wrote: >      >      >      
>>>>>> >>>> >      >      >      >>>>                             I 
>>>>>> concur with Joel's >     assessment >      >      >     with the 
>>>>>> >      >      >      >>>>                             following 
>>>>>> >     clarifications. >      >      >      >>>> >      >      >  
>>>>>>     >>>>                             The current document >     
>>>>>> is already >      >      >     capable >      >      >      >>>> 
>>>>>>                             of monitoring >     multiple VNIs >  
>>>>>>     >      >     between VTEPs. >      >      >      >>>> >      
>>>>>> >      >      >>>>                             The issue under > 
>>>>>>     discussion >      >     was how >      >      >     do we >  
>>>>>>     >      >      >>>>                             use BFD to 
>>>>>> monitor >     multiple >      >     VAPs that >      >      >    
>>>>>>   >>>>                             use the same VNI >     
>>>>>> between a >      >     pair of >      >      >      >>>>         
>>>>>>                     VTEPs.  The use case for >      >     this 
>>>>>> is not >      >      >      >>>>                             
>>>>>> clear to me, as from my >      >     understanding, >      >     
>>>>>>  >      >>>>                             we cannot have a >     
>>>>>> situation with >      >      >     multiple >      >      >      
>>>>>> >>>>                             VAPs using the same >      >    
>>>>>>  VNI--there is 1:1 >      >      >      >>>>                     
>>>>>>         mapping between VAP >     and VNI. >      >      >      
>>>>>> >>>> >      >      >      >>>>                             Anoop 
>>>>>> >      >      >      >>>> >      >      >      >>>>              
>>>>>>                On Tue, Oct 22, 2019 >     at 6:06 AM >      >    
>>>>>>   >     Joel M. >      >      >      >>>>                        
>>>>>>      Halpern >      >     >>>>>  >>>>> > >     >>>>>  >>>>> >> >      >      >     
>>>>>>  >     
>>>>>> > 
>>>>>>  >     
>>>>>> >>> >    
>>>>>>   >      >      >>>> >       >>>>>  >>>>> > >      >     
>>>>>>  
>>>>>> >> >     
>>>>>>  >      >     >>>>>  >     >>>>> > >>>>>  >     >>>>> >>>>> >      >     wrote: >      >   
>>>>>>    >      >>>> >      >      >      >>>>                         
>>>>>>          From what I can >     tell, >      >     there >      > 
>>>>>>      >     are two >      >      >      >>>>                     
>>>>>>             separate problems. >      >      >      >>>>         
>>>>>>                         The document we >     have is a >      > 
>>>>>>      >     VTEP-VTEP >      >      >      >>>>                   
>>>>>>               monitoring >     document. >      >     There is 
>>>>>> no >      >      >      >>>>                                 
>>>>>> need for that >     document to >      >      >     handle the > 
>>>>>>      >      >      >>>>                                 multiple 
>>>>>> VNI case. >      >      >      >>>>                              
>>>>>>    If folks want a >      >     protocol for doing >      >      
>>>>>> >      >>>>                                 BFD monitoring >     
>>>>>> of things >      >      >     behind the >      >      >      
>>>>>> >>>>                                 VTEPs (multiple >     
>>>>>> VNIs), >      >     then do >      >      >     that >      >    
>>>>>>   >      >>>>                                 as a separate >    
>>>>>>   >     document.   The >      >      >      >>>>                
>>>>>>                  encoding will be >     a tenant >      >      > 
>>>>>>     encoding, >      >      >      >>>>                          
>>>>>>        and thus >     sesparate from >      >     what is >      
>>>>>> >      >      >>>>                                 defined in 
>>>>>> this >     document. >      >      >      >>>> >      >      >   
>>>>>>    >>>>                                 Yours, >      >      >   
>>>>>>    >>>>                                 Joel >      >      >     
>>>>>>  >>>> >      >      >      >>>>                                 
>>>>>> On 10/21/2019 >     5:07 PM, >      >     Jeffrey >      >      
>>>>>> >     Haas >      >      >      >>>>                             
>>>>>>     wrote: >      >      >      >>>>                             
>>>>>>     > Santosh and >     others, >      >      >      >>>>        
>>>>>>                          > >      >      >      >>>>             
>>>>>>                     > On Thu, Oct >     03, 2019 at >      >     
>>>>>>  >     07:50:20PM >      >      >      >>>>                      
>>>>>>            +0530, Santosh P >     K wrote: >      >      >      
>>>>>> >>>>                                 >>     Thanks >     for 
>>>>>> your >      >      >     explanation. >      >      >      >>>>  
>>>>>>                                This helps a lot. I >      >     
>>>>>> would wait >      >      >     for more >      >      >      
>>>>>> >>>>                                 >> comments from >     
>>>>>> others >      >     to see if >      >      >      >>>>          
>>>>>>                        this what we >     need in this >      >  
>>>>>>     >     draft to be >      >      >      >>>>                  
>>>>>>                >> supported >     based on >      >     that we 
>>>>>> can >      >      >      >>>>                                 
>>>>>> provide appropriate >      >     sections >      >      >     in 
>>>>>> the >      >      >      >>>>                                 
>>>>>> draft. >      >      >      >>>>                                 
>>>>>> > >      >      >      >>>>                                 > 
>>>>>> The threads on the >      >     list have >      >      >      
>>>>>> >>>>                                 spidered to the >     point 
>>>>>> >      >     where it is >      >      >      >>>>               
>>>>>>                   challenging >      >      >      >>>>          
>>>>>>                        > to follow what the >      >     current 
>>>>>> >      >      >     status >      >      >      >>>>             
>>>>>>                     of the draft is, >     or should >      >    
>>>>>>   >     be.  :-) >      >      >      >>>>                       
>>>>>>           > >      >      >      >>>>                            
>>>>>>      > However, if I've >      >     followed things >      >    
>>>>>>   >      >>>>                                 properly, the >    
>>>>>>  question >      >     below is >      >      >      >>>>        
>>>>>>                          really the >      >      >      >>>>    
>>>>>>                              > hinge point on >     what our >   
>>>>>>    >      >      >>>>                                 
>>>>>> encapsulation >     for BFD >      >     over vxlan >      >     
>>>>>>  >      >>>>                                 should look like. > 
>>>>>>      >      >      >>>>                                 > 
>>>>>> Correct? >      >      >      >>>>                               
>>>>>>   > >      >      >      >>>>                                 > 
>>>>>> Essentially, >     do we or >      >     do we not >      >      
>>>>>> >      >>>>                                 require the >     
>>>>>> ability to >      >     permit >      >      >      >>>>         
>>>>>>                         multiple BFD >      >      >      >>>>   
>>>>>>                               > sessions between >      >     
>>>>>> distinct VAPs? >      >      >      >>>>                         
>>>>>>         > >      >      >      >>>>                              
>>>>>>    > If this is so, >     do we >      >     have a >      >     
>>>>>>  >     sense >      >      >      >>>>                           
>>>>>>       as to how we should >      >     proceed? >      >      >  
>>>>>>     >>>>                                 > >      >      >      
>>>>>> >>>>                                 > -- Jeff >      >      >   
>>>>>>    >>>>                                 > >      >      >      
>>>>>> >>>>                                 > [context preserved >      
>>>>>> >     below...] >      >      >      >>>>                        
>>>>>>          > >      >      >      >>>>                             
>>>>>>     >> Santosh P K >      >      >      >>>>                     
>>>>>>             >> >      >      >      >>>>                         
>>>>>>         >> On Wed, Sep >     25, 2019 >      >     at 8:10 AM >  
>>>>>>     >      >      >>>> >       >>>>>  >>>>> > >      >     
>>>>>>  
>>>>>> >> >   
>>>>>>    >      >     >>>>>  >     >>>>> > >>>>>  >     >>>>> >>> >      >      >      >>>> >     
>>>>>>  >       >>>>>  >>>>> > >     
>>>>>>  
>>>>>> >> >   
>>>>>>    >      >     >>>>>  >     >>>>> > >>>>>  >     >>>>> >>>>> >      >     wrote: >      >  
>>>>>>     >      >>>>                                 >> >      >      
>>>>>> >      >>>>                                 >>> Hi Santosh, >    
>>>>>>   >      >      >>>>                                 >>> >      
>>>>>> >      >      >>>>                                 >>> >      >  
>>>>>>     >      >>>>                                 >>> With regard 
>>>>>> >     to the >      >     question >      >      >      >>>>     
>>>>>>                             whether we >     should allow >      
>>>>>> >      >     multiple BFD >      >      >      >>>>              
>>>>>>                    sessions >      >      >      >>>>            
>>>>>>                      >>> for the same >     VNI or >      >     
>>>>>> not, >      >      >     IMHO we >      >      >      >>>>       
>>>>>>                           should allow it, >     more >      >   
>>>>>>    >     explanation as >      >      >      >>>>                
>>>>>>                  >>> follows. >      >      >      >>>>          
>>>>>>                        >>> >      >      >      >>>>             
>>>>>>                     >>> Below is a >     figure >      >     
>>>>>> derived from >      >      >      >>>>                           
>>>>>>       figure 2 of >     RFC8014 (An >      >      >     
>>>>>> Architecture for >      >      >      >>>>                       
>>>>>>           >>> Data-Center >     Network >      >      >      
>>>>>> >>>>  Virtualization >     over Layer 3 >      >      >     
>>>>>> (NVO3)). >      >      >      >>>>                               
>>>>>>   >>> >      >      >      >>>>                                 
>>>>>> >>> >              | >      >      >      >>>>                   
>>>>>>                Data Center Network >      >     (IP)        | >  
>>>>>>     >      >      >>>>                                 >>> >     
>>>>>>          | >      >      >      >>>> >      >             | >    
>>>>>>   >      >      >>>>                                 >>> >      
>>>>>> >      >      >>>> >      >      >       
>>>>>> +-----------------------------------------+ >      >      >      
>>>>>> >>>>                                 >>> >      >             | 
>>>>>> >      >      >      >>>> >           | >      >      >      
>>>>>> >>>>                                 >>> >      >             | 
>>>>>> >      >      >      >>>>                                  
>>>>>> Tunnel Overlay >          | >      >      >      >>>>            
>>>>>>                      >>> >      >      >      >>>> >       
>>>>>> +------------+---------+ >      >      >      >>>> >        
>>>>>> +---------+------------+ >      >      >      >>>>               
>>>>>>                   >>>         | >      >      >      >>>> >      
>>>>>>  +----------+-------+ | >      >           | >      >      >     
>>>>>>  >>>> >       +-------+----------+ | >      >      >      >>>>   
>>>>>>                               >>> >     | | >      >     Overlay 
>>>>>> >      >      >      >>>>                                 Module 
>>>>>>  | | >       | | >      >     Overlay >      >      >      >>>>  
>>>>>>                                Module  | | >      >      >      
>>>>>> >>>>                                 >>>         | >      >      
>>>>>> >      >>>> >       +---------+--------+ | >      >           | 
>>>>>> >      >      >      >>>> >       +---------+--------+ | >      
>>>>>> >      >      >>>>                                 >>>         | 
>>>>>> >      >           | >      >      >      >>>>                   
>>>>>>                   |    | >             | >      >      >         
>>>>>>  | >      >      >      >>>>                                 >>> 
>>>>>>  NVE1   | >      >           | >      >      >      >>>>         
>>>>>>                             |    | >             | >      >      
>>>>>> >          | >      >      >      >>>>                           
>>>>>>       NVE2 >      >      >      >>>>                             
>>>>>>     >>>         | >      >      >      >>>> >       
>>>>>> +--------+-------+  | >      >           | >      >      >      
>>>>>> >>>> >       +--------+-------+  | >      >      >      >>>>     
>>>>>>                             >>> >     |  |VNI1 >      >      >   
>>>>>>   VNI2  VNI1 >      >      >      >>>>                           
>>>>>>       |  |  |  | VNI1 >      >     VNI2 VNI1 >      >      >     
>>>>>> |  | >      >      >      >>>>                                 
>>>>>> >>>         | >      >      >      >>>> >       
>>>>>> +-+-----+----+---+  | >      >           | >      >      >      
>>>>>> >>>> >       +-+-----+-----+--+  | >      >      >      >>>>     
>>>>>>                             >>> >     |VAP1| >      >     VAP2|  
>>>>>>   | >      >      >      >>>>                                 
>>>>>> VAP3 | >       |VAP1| VAP2| >      >      >       | VAP3| >      
>>>>>> >      >      >>>>                                 >>> >      >  
>>>>>>     >      >>>> >       +----+-----+----+------+ >      >      > 
>>>>>>      >>>> >        +----+-----+-----+-----+ >      >      >      
>>>>>> >>>>                                 >>> >      >       |     | 
>>>>>> >      >      >        | >      >      >      >>>>        | >    
>>>>>>   >       |     | >      >      >      >>>>                      
>>>>>>            >>> >      >       |     | >      >      >        | > 
>>>>>>      >      >      >>>>        | >      >       |     | >      > 
>>>>>>      >      >>>>                                 >>> >      >    
>>>>>>    |     | >      >      >        | >      >      >      >>>>    
>>>>>>     | >      >       |     | >      >      >      >>>>           
>>>>>>                       >>> >      >      >      >>>> >      >     
>>>>>>  > >       
>>>>>> -------+-----+----+-------------------+-----+-----+------- >     
>>>>>>  >      >      >>>>                                 >>> >      > 
>>>>>>       |     | >      >      >        | >      >      >      >>>> 
>>>>>>  Tenant        | >      >       |     | >      >      >      
>>>>>> >>>>                                 >>> >     TSI1 | >      >   
>>>>>>   TSI2|    | >      >      >      >>>>                           
>>>>>>       TSI3 >     TSI1| TSI2| >      >      >       |TSI3 >      
>>>>>> >      >      >>>>                                 >>> >      >  
>>>>>>    +---+ +---+ >      >      >      >>>>                         
>>>>>>         +---+ >       +---+ >      >     +---+ >      >      >   
>>>>>>     +---+ >      >      >      >>>>                              
>>>>>>    >>> >      >     |TS1| |TS2| >      >      >      >>>>        
>>>>>>                          |TS3| >       |TS4| >      >     |TS5| 
>>>>>> >      >      >       |TS6| >      >      >      >>>>            
>>>>>>                      >>> >      >     +---+ +---+ >      >      
>>>>>> >      >>>>                                 +---+ >       +---+ 
>>>>>> >      >     +---+ >      >      >       +---+ >      >      >   
>>>>>>    >>>>                                 >>> >      >      >      
>>>>>> >>>>                                 >>> To my >      >     
>>>>>> understanding, the BFD >      >      >      >>>>                 
>>>>>>                 sessions between >     NVE1 >      >     and 
>>>>>> NVE2 are >      >      >      >>>>                               
>>>>>>   actually >      >      >      >>>>                             
>>>>>>     >>> initiated and >      >     terminated >      >      >    
>>>>>>  at VAP >      >      >      >>>>                                
>>>>>>  of NVE. >      >      >      >>>>                               
>>>>>>   >>> >      >      >      >>>>                                 
>>>>>> >>> If the >     network operator >      >      >     want to >  
>>>>>>     >      >      >>>>                                 set up 
>>>>>> one BFD >     session >      >     between >      >      >     
>>>>>> VAP1 of >      >      >      >>>>                                
>>>>>>  >>> NVE1 and VAP1of >      >     NVE2, at the >      >      >   
>>>>>>    >>>>                                 same time >     another 
>>>>>> BFD >      >     session >      >      >      >>>>               
>>>>>>                   between VAP3 of >      >      >      >>>>      
>>>>>>                            >>> NVE1 and >     VAP3 of NVE2, >    
>>>>>>   >      >     although >      >      >      >>>>                
>>>>>>                  the two BFD sessions >      >     are for >     
>>>>>>  >      >     the same >      >      >      >>>>                 
>>>>>>                 >>> VNI1, I >     believe it's >      >      >   
>>>>>>   reasonable, >      >      >      >>>>                          
>>>>>>        so that's why I >     think we >      >      >     should 
>>>>>> allow it >      >      >      >>>> >      >      >      >>>> >   
>>>>>>    >      >       
>>>>>> _______________________________________________ >      >      >  
>>>>>>     >>>>                                 nvo3 mailing list >     
>>>>>>  >      >      >>>> nvo3@ietf.org  
>>>>>> > >     
>>>>>>  
>>>>>> >> >      >     
>>>>>>  
>>>>>> > >     
>>>>>>  
>>>>>> >>> 
>>>>>>  >     
>>>>>> > >      >     
>>>>>>  
>>>>>> >> >      >      >   
>>>>>>    
>>>>>> > >     
>>>>>>  
>>>>>> >>>> >      >      > 
>>>>>>      >>>> https://www.ietf.org/mailman/listinfo/nvo3 >      >    
>>>>>>   >      >>>> >      >      > >      > >
>>>>> 

--=-ajmQCSFOLmGt2p9Q86gB
Content-Type: text/html; charset=us-ascii




On Wed, Oct 30, 2019 at 11:40 AM, Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Dinesh,

Your earlier comment was about silicon, that's why I discussed only the trapping issue.  As far as software goes, IP stacks would typically discard packets received from a non-loopback interface if the packet's address is in 127/8.  I am not sure a traditional IP stack can play here because even on Tx, we have the same MAC for reaching all remote VTEPs.  It seems to me the BFD module would have to be working directly with L2 frames coming off the tunnel.  Kind of like if we were running LLDP between the VTEPs.

Hi Anoop,

My earlier comment was indeed about silicon, but the packet has to go through the software stack as well once it gets to the CPU. Linux-based
  solutions such as Linux servers or Cumulus Linux or maybe even SONIC will need to have a valid IP address to process the packet. Given that 127/8 is already mandated by MPLS BFD, sticking with that is better than ignoring the IP address. This is why I agreed with Jeffrey Haas' comment about SHOULD be set. 

Dinesh

Thanks,
Anoop

On Tue, Oct 29, 2019 at 10:02 PM Dinesh Dutt <didutt@gmail.com> wrote:









Trapping to the CPU would be fine based on MAC DA. But once there, a self-respecting network stack would look at the IP header to decide what to do. Ignoring it on receive may not be an option,



Dinesh




On Oct 30, 2019, 10:26 AM +0530, Anoop Ghanwani <anoop@alumni.duke.edu>, wrote:




Hi Dinesh,




What would break?  If messages are trapped to CPU based on the MAC DA, what is the problem?





On the flip side, there are implementations running BFD today which use different addresses as specified here:



>>>




       bfd_config_local : bfd_dst_ip: optional string
              Set to an IPv4 address to set the IP address that is expected as
              destination   for   received   BFD   packets.   The  default  is
              169.254.1.0.


>>>





Thanks,


Anoop








On Tue, Oct 29, 2019 at 7:01 PM Dinesh Dutt <didutt@gmail.com> wrote:






I suspect silicon implementations will have a problem with saying that they can be set to anything and MUST be ignored on reception. Your logic is sound, it's just that I fear you'll break many existing implementations. I recommend sticking with the 127/8 address for this case.





Dinesh






On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern <jmh@joelhalpern.com> wrote:




In all the discussion about what VNI to use and multiple VNI support, I lsot track. Sorry. Still, the earlier documents did not specify the IP to use. That does NOT mean that we are required in later revisions of the document to allow anything the client wants. Having said that, we could add text saying that since the IP address in the BFD request in VNI 0 is effectively meaningless, it can be set to any value on transmission and must be ignored on reception. As far as I can tell, it is definitional that the VtEP does not have any assigned IP address for VNI 0, so we can't expect that address. Yours, Joel On 10/29/2019 11:10 AM, Anoop Ghanwani wrote:

Hi Joel, Yes, existing implementations use VNI 0 for BFD over VXLAN.  Here are a couple of references: https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665 I guess this document has been evolving and I have not kept up with it. The version I had reviewed and commented on originally allowed for VNI 0.  The -04 version of the draft has this: https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7 What version are you referring to? Thanks, 
 Anoop On Mon, Oct 28, 2019 at 12:55 PM Joel M. Halpern <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> wrote: You are saying that there are existing implementations using VNI 0 for this?  Given that previous versions of the spec explicitly disallowed VNI 0, I am having trouble with your objecting that a spec for how to run over VNI 0 breask existing implementations. Note that when there is a good technical reason, the IETF does change Internet Drafts in ways that break early implementations.  That is the price of standardization. Yours, Joel On 10/28/2019 2:30 PM, Anoop Ghanwani wrote: > Hi Joel, > > Writing the spec in that way would make the current, inter-operable > implementation of multiple vendors non-compliant with the spec. > > Thanks, > Anoop > > On Mon, Oct 28, 2019 at 11:07 AM Joel M. Halpern <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> > <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>> wrote: > >     I assumed this was only for the case where a tenant VNI was being used. > >     For the 0 VNI (which is what I prefer), always (MUST) use the loopback >     address.  There are no addresses assigned to the VTEP in that space. >     There is no IRB in that space. > >     Yours, >     Joel > >     On 10/28/2019 1:58 PM, Anoop Ghanwani wrote: >      > Joel, >      > >      > Are we going to qualify this by VNI?  There's 
 a bunch of >     implementations >      > out there that don't use a tenant IP or a loopback with VNI 0--they >      > simply repeat the underlay IP in the inner IPDA. >      > >      > Thanks, >      > Anoop >      > >      > On Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern >     <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> >      > <mailto:jmh@joelhalpern.com <
 mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>> wrote: >      > >      >     I can live with saying that you SHOULD use loopback, and MAY >     instead >      >     use >      >     an IP address in the customer space known to be owned by the VTEP >      >     device >      >     when such exists. >      > >      >     Yours, >      >     Joel >      > >      >     On 10/28/2019 1:32 PM, Anoop Ghanwani wrote: >      >  
     > Hi Joel, >      >      > >      >      > Perhaps we need to say use of an address owned by the device >      >     containing >      >      > the VTEP. >      >      > >      >      > Or are you suggesting that the use of the loopback address >     space >      >     is a MUST? >      >      > >      >      > Anoop >      >      > >      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel M. Halpern >      >     <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>> >      >      > <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>>> wrote: >      >      > >      >      >     There is something I am missing in your assumption >     about IRB. >      >      > >      >      >     As I understand VxLAN, the VTEP is under the control >     of the >      >     operator. >    &nbs
 p; >      >     As such, it is a pure bridge.  If you run IRB behind >     it, that >      >     is fine. >      >      >     Yes, an operator may offer IRB.  But as I understand it, >      >     conceptually, >      >      >     in terms of the VxLAN architecture the IRB is an entity >      >     behind the >      >      >     VTEP, >      >      >     not part of the VTEP. >      >      > >      >      >     Yours, >      >      >     Joel >   
 ;   >      > >      >      >     On 10/28/2019 12:23 PM, Anoop Ghanwani wrote: >      >      >      > Santosh, >      >      >      > >      >      >      > Does it have to be a MUST?  What if I am running >     IRB and there >      >      >     are IP >      >      >      > addresses per VNI assigned to the VTEPs? Why can the >      >     operator not >      >      >      > choose to use those? >      >      >      > >      >  &nbs
 p;   >      > Anoop >      >      >      > >      >      >      > On Mon, Oct 28, 2019 at 7:51 AM Santosh P K >      >      >      > <santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>> >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>>> >      >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>> >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>>>> >      >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>> >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>>> >      >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>> >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>>>>>> wrote: >      >      >      > >      >      >      >     Dinesh, Anoop et all, >      >      >      >           Lets us know if this text works for 127/8 >      >     address range? >      >      >      > >    
   >      >      >     [proposed text for firewall] >      >      >      > >      >      >      >     "As per section 4 inner destination IP address >     MUST be >      >     set to >      >      >     127/8 >      >      >      >     address. There may be firewall configured on >     VTEP to >      >     block 127/8 >      >      >      >     address range if set as destination IP in inner IP >      >     header. It is >      >    
   >      >     recommended to allow 127/8 range address through >      >     firewall only if >      >      >      >     127/8 IP address is set as destination address >     in inner IP >      >      >     header." >      >      >      > >      >      >      > >      >      >      >     In section 4 we are talking about using 127/8 >     and not >      >     really >      >      >     giving >      >      >      >  &
 nbsp;  reason why. I think we should have text as RFC 5884 >      >     has mentioned >      >      >      >     with below text. >      >      >      > >      >      >      >     [From RFC 5884] >      >      >      >     "The motivation for using the address range >     127/8 is >      >     the same as >      >      >      >     specified in Section 2.1 of [RFC4379] >      >      >      >  <https://tools.ie
 tf.org/html/rfc4379#section-2.1>. >      >     This is an >      >      >      >     exception to the behavior defined in [RFC1122 >      >      >      >     <https://tools.ietf.org/html/rfc1122>]." >      >      >      > >      >      >      > >      >      >      > >      >      >      >     Thanks >      >      >      >     Santosh P K >      >      >      > &g
 t;      >      >      > >      >      >      > >      >      >      >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt >      >     <didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>> >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>> >      >      >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>> >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>> >      >      >      >     <mail
 to:didutt@gmail.com <mailto:didutt@gmail.com> >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>> <mailto:didutt@gmail.com <mailto:didutt@gmail.com> >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>> >      >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>> >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>>>> wrote: >      >      >      > >      >      >      >         Looks good to me Greg. I see that the text >     around >      >     the use >      >      >     of the >      >      >      >         inner IP address as also q
 uite acceptable. Will >      >     you add any >      >      >      >         words about the firewall? >      >      >      > >      >      >      >         Dinesh >      >      >      > >      >      >      >         On Wed, Oct 23, 2019 at 8:36 PM, Greg Mirsky >      >      >      >         <gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>> >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com
 >> >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>> >      >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>> <mailto:gre
 gimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>> >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>>>> wrote: >      >      >      >>         Hi Dinesh, et al., >      >      >      >>         please check the updated version that >     removed the >      >      >     reference to >      >      >      >>         Hypervisor in the text and Figure 1. >      >      >      >> >      >      >      >>         Regards, >    &nb
 sp; >      >      >>         Greg >      >      >      >> >      >      >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K >      >      >      >>         <santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>> >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>>> >      >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>> >      >&
 nbsp;    <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>>>> >      >      >      >>  <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:s
 antosh.pallagatti@gmail.com>> >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>>> >      >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>> >      >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com> >     <mailto:santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com>>>>>> wrote: >      >      >      >> >      >      >      >>             Dinesh, >      >      >      >>                  P
 lease see my inline comments [SPK] >      >      >      >> >      >      >      >> >      >      >      >>                 - In section 3, there's a sentence >     that >      >     is: "BFD >      >      >      >>                 packets intended for a Hypervisor >     VTEP MUST >      >      >     NOT..". I >      >      >      >>                 recommend getting rid of the word >      >    &nb
 sp;"Hypervisor" ashe >      >      >      >>                 logic applies to any VTEP. >      >      >      >> >      >      >      >>             [SPK] Thanks for comments. We will >     change this. >      >      >      >> >      >      >      >>                 - You already explained the >     precedence of >      >     the use of >      >      >      >>                 127/8 address in 
 the inner header in >      >     MPLS. I have no >      >      >      >>                 specific comments in that area. I have >      >     only two >      >      >      >>                 questions: >      >      >      >>                    - Has anybody verified that the >     use of >      >     127/8 >      >      >      >>                 address (and the right MAC) works with >      >     exist
 ing >      >      >      >>                 implementations, including the silicon >      >     ones? If this >      >      >      >>                 doesn't work there, is it worth >     adding the >      >      >     possibilit >      >      >      >>                 y of another address, one that is >     owned >      >     by the >      >      >     VTEP node? >      >      >      >> >  &nbs
 p;   >      >      >>                    - Do we know if Firewalls stop >     such VXLAN >      >      >     packets? >      >      >      >>                 I ask this because VXLAN has an IP >     header >      >     and I >      >      >     don't >      >      >      >>                 know if firewalls stop packets >     with 127/8 >      >     in the >      >      >     inner >  &
 nbsp;   >      >      >>                 header. If not, is it worth adding a >      >     sentence to say >      >      >      >>                 that firewalls  allow such >     packets? The >      >     use of a >      >      >      >>                 non-127/8 address may alleviate >     this case >      >     as well. >      >      >      >> >      >      >      >>             [SPK] 
 I think we may need to add the text >      >     about firewall >      >      >      >>             as some checks in firewall will be >     there if >      >     they are not >      >      >      >>             already using MPLS OAM which has inner IP >      >     header with >      >      >      >>             127/8 address range. >      >      >      >> >      >      >      >> >      >      >      >>
 ;                 The rest of the draft looks good >     to me, >      >      >      >> >      >      >      >>                 Dinesh >      >      >      >> >      >      >      >>                 On Wed, Oct 23, 2019 at 7:58 AM, >     Greg Mirsky >      >      >      >>                 <gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> > 
     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>> >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>> >      >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregim
 irsky@gmail.com <mailto:gregimirsky@gmail.com>> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>> >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>> >      >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>>>> >      >      >      >>                 wrote: >      >      >      >>>                 Hi Dinesh, >      >      >      >>>                 I greatly appreciate your comments. >      >     Please heave a >      >      >      >>>                 look at the at
 tached copy of the >     working >      >      >     version and >      >      >      >>>                 its diff to -07 (latest in the >     datatracker). >      >      >      >>> >      >      >      >>>                 Regards, >      >      >      >>>                 Greg >      >      >      >>> >      >      >      >>>                 On Tu
 e, Oct 22, 2019 at 9:52 PM >     Dinesh Dutt >      >      >      >>>                 <didutt@gmail.com <mailto:didutt@gmail.com> >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com>> >      >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>> >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>> >      >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>> >      >      >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>> >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>> >      >     <mailto:didutt@gmail.com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>> >     <mailto:didutt@gmail
 .com <mailto:didutt@gmail.com> <mailto:didutt@gmail.com <mailto:didutt@gmail.com>>>>>> wrote: >      >      >      >>> >      >      >      >>>                     I have the same feeling as Anoop. >      >     Greg, can you >      >      >      >>>                     please point me to the latest >     draft >      >     so that >      >      >     I can
  >      >      >      >>>                     quickly glance through it to be >      >     doubly sure, >      >      >      >>> >      >      >      >>>                     Dinesh >      >      >      >>> >      >      >      >>>                     On Wed, Oct 23, 2019 at 4:35 AM, >      >     Anoop Ghanwani >      >      >      >>>            &nbs
 p;        <anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>> >      >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>> >      >      >     <mail
 to:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>> <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>>> >      >      >      >>>  <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>> >      >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>> >      >      >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>> >      >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>>>>> wrote: >      >      >      >>>>                     Greg, >      >      >      >>>> >      >      >      >>>&
 gt;                     I think the draft is fine as is. >      >      >      >>>> >      >      >      >>>>                     I discussion with Xiao Min was >      >     about #3 and I >      >      >      >>>>                     see that as unnecessary until we >      >     have a draft >      >      >      >>>>                     that explains why that is >     needed in the >      >  &n
 bsp;   >     context >      >      >      >>>>                     of the NVO3 architecture. >      >      >      >>>> >      >      >      >>>>                     Anoop >      >      >      >>>> >      >      >      >>>>                     On Tue, Oct 22, 2019 at 11:17 AM >      >     Greg Mirsky >      >      >      >>>>  <gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>> >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>> >      >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>> >      >      >      >>>> >       <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>> >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>> >      >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregimirsky@gmail.com &
 lt;mailto:gregimirsky@gmail.com>> >      >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com> >     <mailto:gregimirsky@gmail.com <mailto:gregimirsky@gmail.com>>>>>> wrote: >      >      >      >>>> >      >      >      >>>>                         Hi Anoop, et al., >      >      >      >>>>           
 ;              I agree with your >     understanding >      >     of what is >      >      >      >>>>                         being defined in the current >      >     version >      >      >     of the >      >      >      >>>>                         BFD over VxLAN >     specification. >      >     But, as I >      >      >      >>>>                         understa
 nd, the WG is >      >     discussing the scope >      >      >      >>>>                         before the WGLC is closed. I >      >     believe there >      >      >      >>>>                         are three options: >      >      >      >>>> >      >      >      >>>>                          1. single BFD session >     between >      >     two VTEPs >      >      >
 ;      >>>>                          2. single BFD session >     per VNI >      >     between >      >      >     two VTEPs >      >      >      >>>>                          3. multiple BFD >     sessions per >      >     VNI between >      >      >      >>>>                             two VTEPs >      >      >      >>>> >      >      >      >&
 gt;>>                         The current text >     reflects #2. Is WG >      >      >     accepts >      >      >      >>>>                         this scope? If not, which >      >     option WG would >      >      >      >>>>                         accept? >      >      >      >>>> >      >      >      >>>>                         Regards, >  
     >      >      >>>>                         Greg >      >      >      >>>> >      >      >      >>>>                         On Tue, Oct 22, 2019 at >     2:09 PM >      >     Anoop >      >      >      >>>>                         Ghanwani >     <anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>> >      >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>> >      >      >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>> <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>>> >      >      >      >>>> >       <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>> >    &
 nbsp; >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>> >      >      >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>> >      >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu> >     <mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>>>>> wrote: >      >      >      >>>> >      >      >      >>>>                             I concur with Joel's >     assessment >      >      >     with the >      >      >      >>>>                             follo
 wing >     clarifications. >      >      >      >>>> >      >      >      >>>>                             The current document >     is already >      >      >     capable >      >      >      >>>>                             of monitoring >     multiple VNIs >      >      >     between VTEPs. >      >      >      >>>> >      >      >      >>>>  &
 nbsp;                          The issue under >     discussion >      >     was how >      >      >     do we >      >      >      >>>>                             use BFD to monitor >     multiple >      >     VAPs that >      >      >      >>>>                             use the same VNI >     between a >      >     pair of >      >      >      >>>>   
                           VTEPs.  The use case for >      >     this is not >      >      >      >>>>                             clear to me, as from my >      >     understanding, >      >      >      >>>>                             we cannot have a >     situation with >      >      >     multiple >      >      >      >>>>                             VAP
 s using the same >      >     VNI--there is 1:1 >      >      >      >>>>                             mapping between VAP >     and VNI. >      >      >      >>>> >      >      >      >>>>                             Anoop >      >      >      >>>> >      >      >      >>>>                             On Tue, Oct 22, 2019 >     at 6:06 AM >      >
       >     Joel M. >      >      >      >>>>                             Halpern >      >     <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>> >      >      >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>> >      >      >      >>
 ;>> >       <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> >      >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>> >      >      >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com> >     <mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>>>>> >      >     wrote: >      >      >      >>>> >      >      >      >>>>                  &nbs
 p;               From what I can >     tell, >      >     there >      >      >     are two >      >      >      >>>>                                 separate problems. >      >      >      >>>>                                 The document we >     have is a >      >      >     VTEP-VTEP >      >      >      >>>>                          &nbs
 p;      monitoring >     document. >      >     There is no >      >      >      >>>>                                 need for that >     document to >      >      >     handle the >      >      >      >>>>                                 multiple VNI case. >      >      >      >>>>                                 If folks want a >      >     protocol for doing >
 ;      >      >      >>>>                                 BFD monitoring >     of things >      >      >     behind the >      >      >      >>>>                                 VTEPs (multiple >     VNIs), >      >     then do >      >      >     that >      >      >      >>>>                                 as a separate >      >   
   document.   The >      >      >      >>>>                                 encoding will be >     a tenant >      >      >     encoding, >      >      >      >>>>                                 and thus >     sesparate from >      >     what is >      >      >      >>>>                                 defined in this >     document. >      >     
 ; >      >>>> >      >      >      >>>>                                 Yours, >      >      >      >>>>                                 Joel >      >      >      >>>> >      >      >      >>>>                                 On 10/21/2019 >     5:07 PM, >      >     Jeffrey >      >      >     Haas >      >  &nb
 sp;   >      >>>>                                 wrote: >      >      >      >>>>                                 > Santosh and >     others, >      >      >      >>>>                                 > >      >      >      >>>>                                 > On Thu, Oct >     03, 2019 at >      >      >     07:50:20PM &
 gt;      >      >      >>>>                                 +0530, Santosh P >     K wrote: >      >      >      >>>>                                 >>     Thanks >     for your >      >      >     explanation. >      >      >      >>>>                                 This helps a lot. I >      >     would wait >      >      >     for more >
 ;      >      >      >>>>                                 >> comments from >     others >      >     to see if >      >      >      >>>>                                 this what we >     need in this >      >      >     draft to be >      >      >      >>>>                                 >> supported >     based on >      >     that we can >  
     >      >      >>>>                                 provide appropriate >      >     sections >      >      >     in the >      >      >      >>>>                                 draft. >      >      >      >>>>                                 > >      >      >      >>>>                                 &
 gt; The threads on the >      >     list have >      >      >      >>>>                                 spidered to the >     point >      >     where it is >      >      >      >>>>                                 challenging >      >      >      >>>>                                 > to follow what the >      >     current >      >      >     status >&nb
 sp;     >      >      >>>>                                 of the draft is, >     or should >      >      >     be.  :-) >      >      >      >>>>                                 > >      >      >      >>>>                                 > However, if I've >      >     followed things >      >      >      >>>>               
                   properly, the >     question >      >     below is >      >      >      >>>>                                 really the >      >      >      >>>>                                 > hinge point on >     what our >      >      >      >>>>                                 encapsulation >     for BFD >      >     over vxlan >      >&nb
 sp;     >      >>>>                                 should look like. >      >      >      >>>>                                 > Correct? >      >      >      >>>>                                 > >      >      >      >>>>                                 > Essentially, >     do we or >      >     do we not >      >    &nb
 sp; >      >>>>                                 require the >     ability to >      >     permit >      >      >      >>>>                                 multiple BFD >      >      >      >>>>                                 > sessions between >      >     distinct VAPs? >      >      >      >>>>                                 > 
 >      >      >      >>>>                                 > If this is so, >     do we >      >     have a >      >      >     sense >      >      >      >>>>                                 as to how we should >      >     proceed? >      >      >      >>>>                                 > >      >      >      >>>>  &nb
 sp;                              > -- Jeff >      >      >      >>>>                                 > >      >      >      >>>>                                 > [context preserved >      >     below...] >      >      >      >>>>                                 > >      >      >      >>>>                  &n
 bsp;              >> Santosh P K >      >      >      >>>>                                 >> >      >      >      >>>>                                 >> On Wed, Sep >     25, 2019 >      >     at 8:10 AM >      >      >      >>>> >       <xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com
 .cn <mailto:xiao.min2@zte.com.cn>> >      >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>> >      >      >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn> >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>&
 gt; <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn> >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>>> >      >      >      >>>> >      >       <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>> >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>> >      >      >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn> >     <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>> <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn> >  &
 nbsp;  <mailto:xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn>>>>>> >      >     wrote: >      >      >      >>>>                                 >> >      >      >      >>>>                                 >>> Hi Santosh, >      >      >      >>>>                                 >>> >      >      &
 gt;      >>>>                                 >>> >      >      >      >>>>                                 >>> With regard >     to the >      >     question >      >      >      >>>>                                 whether we >     should allow >      >      >     multiple BFD >      >      >      >>>>                   
 ;              sessions >      >      >      >>>>                                 >>> for the same >     VNI or >      >     not, >      >      >     IMHO we >      >      >      >>>>                                 should allow it, >     more >      >      >     explanation as >      >      >      >>>>                            &nb
 sp;    >>> follows. >      >      >      >>>>                                 >>> >      >      >      >>>>                                 >>> Below is a >     figure >      >     derived from >      >      >      >>>>                                 figure 2 of >     RFC8014 (An >      >      >     Architecture for >      >      >  &
 nbsp;   >>>>                                 >>> Data-Center >     Network >      >      >      >>>>  Virtualization >     over Layer 3 >      >      >     (NVO3)). >      >      >      >>>>                                 >>> >      >      >      >>>>                                 >>> >              | >      >      >  
     >>>>                                  Data Center Network >      >     (IP)        | >      >      >      >>>>                                 >>> >              | >      >      >      >>>> >      >             | >      >      >      >>>>                                 >>> >      >      >    &n
 bsp; >>>> >      >      >       +-----------------------------------------+ >      >      >      >>>>                                 >>> >      >             | >      >      >      >>>> >           | >      >      >      >>>>                                 >>> >      >             | >      >      >      >>>>    &nbs
 p;                             Tunnel Overlay >          | >      >      >      >>>>                                 >>> >      >      >      >>>> >       +------------+---------+ >      >      >      >>>> >        +---------+------------+ >      >      >      >>>>                                 >>>         | >      >      > 
 ;     >>>> >       +----------+-------+ | >      >           | >      >      >      >>>> >       +-------+----------+ | >      >      >      >>>>                                 >>> >     | | >      >     Overlay >      >      >      >>>>                                 Module  | | >       | | >      >     Overlay >      >      >   
    >>>>                                 Module  | | >      >      >      >>>>                                 >>>         | >      >      >      >>>> >       +---------+--------+ | >      >           | >      >      >      >>>> >       +---------+--------+ | >      >      >      >>>>                                 >>> 
         | >      >           | >      >      >      >>>>                                     |    | >             | >      >      >          | >      >      >      >>>>                                 >>>  NVE1   | >      >           | >      >      >      >>>>                            &n
 bsp;        |    | >             | >      >      >          | >      >      >      >>>>                                 NVE2 >      >      >      >>>>                                 >>>         | >      >      >      >>>> >       +--------+-------+  | >      >           | >      >      >      >>>> >     
 ;  +--------+-------+  | >      >      >      >>>>                                 >>> >     |  |VNI1 >      >      >     VNI2  VNI1 >      >      >      >>>>                                 |  |  |  | VNI1 >      >     VNI2 VNI1 >      >      >     |  | >      >      >      >>>>                                 >>>   
       | >      >      >      >>>> >       +-+-----+----+---+  | >      >           | >      >      >      >>>> >       +-+-----+-----+--+  | >      >      >      >>>>                                 >>> >     |VAP1| >      >     VAP2|    | >      >      >      >>>>                                 VAP3 | >       |VAP1| VAP2| >    &
 nbsp; >      >       | VAP3| >      >      >      >>>>                                 >>> >      >      >      >>>> >       +----+-----+----+------+ >      >      >      >>>> >        +----+-----+-----+-----+ >      >      >      >>>>                                 >>> >      >       |     | >      >      >        | >    
   >      >      >>>>        | >      >       |     | >      >      >      >>>>                                 >>> >      >       |     | >      >      >        | >      >      >      >>>>        | >      >       |     | >      >      >      >>>>                                 >>> >&nbs
 p;     >       |     | >      >      >        | >      >      >      >>>>        | >      >       |     | >      >      >      >>>>                                 >>> >      >      >      >>>> >      >      > >       -------+-----+----+-------------------+-----+-----+------- >      >      >      >>>>                          &
 nbsp;      >>> >      >       |     | >      >      >        | >      >      >      >>>>  Tenant        | >      >       |     | >      >      >      >>>>                                 >>> >     TSI1 | >      >     TSI2|    | >      >      >      >>>>                                 TSI3 >     TSI1| TSI2| > 
 ;     >      >       |TSI3 >      >      >      >>>>                                 >>> >      >     +---+ +---+ >      >      >      >>>>                                 +---+ >       +---+ >      >     +---+ >      >      >       +---+ >      >      >      >>>>                                 >>> >    &n
 bsp; >     |TS1| |TS2| >      >      >      >>>>                                 |TS3| >       |TS4| >      >     |TS5| >      >      >       |TS6| >      >      >      >>>>                                 >>> >      >     +---+ +---+ >      >      >      >>>>                                 +---+ >       +---+ >      &g
 t;     +---+ >      >      >       +---+ >      >      >      >>>>                                 >>> >      >      >      >>>>                                 >>> To my >      >     understanding, the BFD >      >      >      >>>>                                 sessions between >     NVE1 >      >     and NVE2 are >      >    
   >      >>>>                                 actually >      >      >      >>>>                                 >>> initiated and >      >     terminated >      >      >     at VAP >      >      >      >>>>                                 of NVE. >      >      >      >>>>                                 >>> >&n
 bsp;     >      >      >>>>                                 >>> If the >     network operator >      >      >     want to >      >      >      >>>>                                 set up one BFD >     session >      >     between >      >      >     VAP1 of >      >      >      >>>>                                 >>> NVE1 and VAP1of >    
   >     NVE2, at the >      >      >      >>>>                                 same time >     another BFD >      >     session >      >      >      >>>>                                 between VAP3 of >      >      >      >>>>                                 >>> NVE1 and >     VAP3 of NVE2, >      >      >     although >      >      >  &nb
 sp;   >>>>                                 the two BFD sessions >      >     are for >      >      >     the same >      >      >      >>>>                                 >>> VNI1, I >     believe it's >      >      >     reasonable, >      >      >      >>>>                                 so that's why I >     think we >      >      >     should
  allow it >      >      >      >>>> >      >      >      >>>> >      >      >       _______________________________________________ >      >      >      >>>>                                 nvo3 mailing list >      >      >      >>>> nvo3@ietf.org <mailto:nvo3@ietf.org> <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>> >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org> <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>> >      >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org> <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>> >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org> <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>
 ;>> <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org> >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>> >      >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org> <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>> >      >      >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org> <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>> >     <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org> <mailto:nvo3@ietf.org <mailto:nvo3@ietf.org>>>>> >      >      >      >>>> https://www.ietf.org/mailman/listinfo/nvo3 >      >      >      >>>> >      >      > >      > >






















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From: Greg Mirsky 
Date: Wed, 30 Oct 2019 13:06:23 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Dinesh Dutt 
Cc: Anoop Ghanwani , "Joel M. Halpern" ,  Santosh P K , Jeffrey Haas , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Dear All,
thank you for your comments, suggestions that have made the discussion the
most helpful to the Editors. I've tried to reflect your comments in the
updates listed below:

   - on the inner destination IP address:

OLD TEXT:
         Destination IP: IP address MUST NOT be of one of tenant's IP
         addresses.  IP address MAY be selected from the range 127/8 for
         IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
NEW TEXT:
         Destination IP: IP address MUST NOT be of one of tenant's IP
         addresses.  The IP address SHOULD be selected from the range 127/8
         for IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
         Alternatively, the destination IP address MAY be set to VTEP's
         IP address.

   - firewall. Appended Section 3 Deployment with the following paragraph:

   As per Section 4, the inner destination IP address SHOULD be set to
   one of the loopback addresses (127/8 range for IPv4 and
   0:0:0:0:0:FFFF:7F00:0/104 range for IPv6).  There could be a firewall
   configured on VTEP to block loopback addresses if set as the
   destination IP in the inner IP header.  It is RECOMMENDED to allow
   addresses from the loopback range through a firewall only if it is
   used as the destination IP address in the inner IP header, and the
   destination UDP port is set to 3784 [RFC5881].

Regarding the use of VNI 0 as the Management VNI. In Section 6 has been
noted:
   An implementation MAY support the use of the Management
   VNI as control and management channel between VTEPs.  The selection
   of the VNI number of the Management VNI MUST be controlled through
   management plane.  An implementation MAY use VNI number 1 as the
   default value for the Management VNI.

Attached, please find the updated working version and the diff to -07.
Editors much appreciate your comments, suggestions, abd help to have the
new version uploaded before the cut-off deadline.

Regards,
Greg

On Wed, Oct 30, 2019 at 4:46 AM Dinesh Dutt  wrote:

>
>
> On Wed, Oct 30, 2019 at 11:40 AM, Anoop Ghanwani 
> wrote:
>
> Hi Dinesh,
>
> Your earlier comment was about silicon, that's why I discussed only the
> trapping issue.  As far as software goes, IP stacks would typically discard
> packets received from a non-loopback interface if the packet's address is
> in 127/8.  I am not sure a traditional IP stack can play here because even
> on Tx, we have the same MAC for reaching all remote VTEPs.  It seems to me
> the BFD module would have to be working directly with L2 frames coming off
> the tunnel.  Kind of like if we were running LLDP between the VTEPs.
>
>
> Hi Anoop,
>
> My earlier comment was indeed about silicon, but the packet has to go
> through the software stack as well once it gets to the CPU. Linux-based
> solutions such as Linux servers or Cumulus Linux or maybe even SONIC will
> need to have a valid IP address to process the packet. Given that 127/8 is
> already mandated by MPLS BFD, sticking with that is better than ignoring
> the IP address. This is why I agreed with Jeffrey Haas' comment about
> SHOULD be set.
>
> Dinesh
>
>
> Thanks,
> Anoop
>
> On Tue, Oct 29, 2019 at 10:02 PM Dinesh Dutt  wrote:
>
>> Trapping to the CPU would be fine based on MAC DA. But once there, a
>> self-respecting network stack would look at the IP header to decide what to
>> do. Ignoring it on receive may not be an option,
>>
>> Dinesh
>> On Oct 30, 2019, 10:26 AM +0530, Anoop Ghanwani ,
>> wrote:
>>
>> Hi Dinesh,
>>
>> What would break?  If messages are trapped to CPU based on the MAC DA,
>> what is the problem?
>>
>> On the flip side, there are implementations running BFD today which use
>> different addresses as specified here:
>> http://www.openvswitch.org/support/dist-docs/vtep.5.html
>> >>>
>>
>>        *b**f**d**_**c**o**n**f**i**g**_**l**o**c**a**l* *:* *b**f**d**_**d**s**t**_**i**p*: optional string
>>               Set to an IPv4 address to set the IP address that is expected as
>>               destination   for   received   BFD   packets.   The  default  is
>>               *1**6**9**.**2**5**4**.**1**.**0*.
>>
>> >>>
>>
>> Thanks,
>> Anoop
>>
>> On Tue, Oct 29, 2019 at 7:01 PM Dinesh Dutt  wrote:
>>
>>> I suspect silicon implementations will have a problem with saying that
>>> they can be set to anything and MUST be ignored on reception. Your logic is
>>> sound, it's just that I fear you'll break many existing implementations. I
>>> recommend sticking with the 127/8 address for this case.
>>>
>>> Dinesh
>>>
>>> On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern 
>>> wrote:
>>>
>>> In all the discussion about what VNI to use and multiple VNI support, I
>>> lsot track. Sorry. Still, the earlier documents did not specify the IP to
>>> use. That does NOT mean that we are required in later revisions of the
>>> document to allow anything the client wants. Having said that, we could add
>>> text saying that since the IP address in the BFD request in VNI 0 is
>>> effectively meaningless, it can be set to any value on transmission and
>>> must be ignored on reception. As far as I can tell, it is definitional that
>>> the VtEP does not have any assigned IP address for VNI 0, so we can't
>>> expect that address. Yours, Joel On 10/29/2019 11:10 AM, Anoop Ghanwani
>>> wrote:
>>>
>>> Hi Joel, Yes, existing implementations use VNI 0 for BFD over VXLAN.
>>> Here are a couple of references:
>>> https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html
>>> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665
>>> I guess this document has been evolving and I have not kept up with it. The
>>> version I had reviewed and commented on originally allowed for VNI 0.  The
>>> -04 version of the draft has this:
>>> https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7 What
>>> version are you referring to? Thanks, Anoop On Mon, Oct 28, 2019 at 12:55
>>> PM Joel M. Halpern >> >> wrote: You are saying that there are existing
>>> implementations using VNI 0 for this?  Given that previous versions of the
>>> spec explicitly disallowed VNI 0, I am having trouble with your objecting
>>> that a spec for how to run over VNI 0 breask existing implementations. Note
>>> that when there is a good technical reason, the IETF does change Internet
>>> Drafts in ways that break early implementations.  That is the price of
>>> standardization. Yours, Joel On 10/28/2019 2:30 PM, Anoop Ghanwani wrote: >
>>> Hi Joel, > > Writing the spec in that way would make the current,
>>> inter-operable > implementation of multiple vendors non-compliant with the
>>> spec. > > Thanks, > Anoop > > On Mon, Oct 28, 2019 at 11:07 AM Joel M.
>>> Halpern >> > > >>  >>>
>>> wrote: > >     I assumed this was only for the case where a tenant VNI was
>>> being used. > >     For the 0 VNI (which is what I prefer), always (MUST)
>>> use the loopback >     address.  There are no addresses assigned to the
>>> VTEP in that space. >     There is no IRB in that space. > >     Yours, >
>>>    Joel > >     On 10/28/2019 1:58 PM, Anoop Ghanwani wrote: >      > Joel,
>>> >      > >      > Are we going to qualify this by VNI?  There's a bunch of
>>> >     implementations >      > out there that don't use a tenant IP or a
>>> loopback with VNI 0--they >      > simply repeat the underlay IP in the
>>> inner IPDA. >      > >      > Thanks, >      > Anoop >      > >      > On
>>> Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern >     >> > <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >> >      > <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com > <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >>>> wrote: >      > >
>>>     >     I can live with saying that you SHOULD use loopback, and MAY >
>>>  instead >      >     use >      >     an IP address in the customer space
>>> known to be owned by the VTEP >      >     device >      >     when such
>>> exists. >      > >      >     Yours, >      >     Joel >      > >      >
>>>  On 10/28/2019 1:32 PM, Anoop Ghanwani wrote: >      >      > Hi Joel, >
>>>   >      > >      >      > Perhaps we need to say use of an address owned
>>> by the device >      >     containing >      >      > the VTEP. >      >
>>>   > >      >      > Or are you suggesting that the use of the loopback
>>> address >     space >      >     is a MUST? >      >      > >      >      >
>>> Anoop >      >      > >      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel
>>> M. Halpern >      >     >> > 
>>> >> >     <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com > <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >>> >      >      > <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com > <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >> >     <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com > <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >>>>> wrote: >      >
>>>     > >      >      >     There is something I am missing in your
>>> assumption >     about IRB. >      >      > >      >      >     As I
>>> understand VxLAN, the VTEP is under the control >     of the >      >
>>>  operator. >      >      >     As such, it is a pure bridge.  If you run
>>> IRB behind >     it, that >      >     is fine. >      >      >     Yes, an
>>> operator may offer IRB.  But as I understand it, >      >     conceptually,
>>> >      >      >     in terms of the VxLAN architecture the IRB is an entity
>>> >      >     behind the >      >      >     VTEP, >      >      >     not
>>> part of the VTEP. >      >      > >      >      >     Yours, >      >
>>> >     Joel >      >      > >      >      >     On 10/28/2019 12:23 PM,
>>> Anoop Ghanwani wrote: >      >      >      > Santosh, >      >      >
>>> > >      >      >      > Does it have to be a MUST?  What if I am running
>>> >     IRB and there >      >      >     are IP >      >      >      >
>>> addresses per VNI assigned to the VTEPs? Why can the >      >     operator
>>> not >      >      >      > choose to use those? >      >      >      > >
>>>   >      >      > Anoop >      >      >      > >      >      >      > On
>>> Mon, Oct 28, 2019 at 7:51 AM Santosh P K >      >      >      > <
>>> santosh.pallagatti@gmail.com >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >> >
>>>     >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >>>
>>> >      >      >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >> >
>>>     >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >>>>
>>> >      >      >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >> >
>>>     >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >>>
>>> >      >      >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >> >
>>>     >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >>>>>>
>>> wrote: >      >      >      > >      >      >      >     Dinesh, Anoop et
>>> all, >      >      >      >           Lets us know if this text works for
>>> 127/8 >      >     address range? >      >      >      > >      >      >
>>>   >     [proposed text for firewall] >      >      >      > >      >
>>> >      >     "As per section 4 inner destination IP address >     MUST be
>>> >      >     set to >      >      >     127/8 >      >      >      >
>>>  address. There may be firewall configured on >     VTEP to >      >
>>>  block 127/8 >      >      >      >     address range if set as destination
>>> IP in inner IP >      >     header. It is >      >      >      >
>>>  recommended to allow 127/8 range address through >      >     firewall
>>> only if >      >      >      >     127/8 IP address is set as destination
>>> address >     in inner IP >      >      >     header." >      >      >
>>> > >      >      >      > >      >      >      >     In section 4 we are
>>> talking about using 127/8 >     and not >      >     really >      >
>>> >     giving >      >      >      >     reason why. I think we should have
>>> text as RFC 5884 >      >     has mentioned >      >      >      >     with
>>> below text. >      >      >      > >      >      >      >     [From RFC
>>> 5884] >      >      >      >     "The motivation for using the address
>>> range >     127/8 is >      >     the same as >      >      >      >
>>>  specified in Section 2.1 of [RFC4379] >      >      >      >  <
>>> https://tools.ietf.org/html/rfc4379#section-2.1>. >      >     This is
>>> an >      >      >      >     exception to the behavior defined in [RFC1122
>>> >      >      >      >     ]." >
>>>     >      >      > >      >      >      > >      >      >      > >      >
>>>     >      >     Thanks >      >      >      >     Santosh P K >      >
>>>   >      > >      >      >      > >      >      >      > >      >      >
>>>   >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt >      >     <
>>> didutt@gmail.com > <
>>> mailto:didutt@gmail.com  >> >> >      <
>>> mailto:didutt@gmail.com > >>  >>> >
>>>   >      >      <
>>> mailto:didutt@gmail.com > >>  >> >     <
>>> mailto:didutt@gmail.com  >> >  <
>>> mailto:didutt@gmail.com >>>> >      >      >      >
>>>     >> > >      <
>>> mailto:didutt@gmail.com >> >>  > >     <
>>> mailto:didutt@gmail.com  >> >>> >      >     >>  > <
>>> mailto:didutt@gmail.com  >> >> >      <
>>> mailto:didutt@gmail.com > >>  >>>>>>
>>> wrote: >      >      >      > >      >      >      >         Looks good to
>>> me Greg. I see that the text >     around >      >     the use >      >
>>>   >     of the >      >      >      >         inner IP address as also
>>> quite acceptable. Will >      >     you add any >      >      >      >
>>>    words about the firewall? >      >      >      > >      >      >      >
>>>        Dinesh >      >      >      > >      >      >      >         On Wed,
>>> Oct 23, 2019 at 8:36 PM, Greg Mirsky >      >      >      >         <
>>> gregimirsky@gmail.com >> > >     >>  >> >> >      >     >>  >> > >>  >> >>> >     >>  >> > >>  >> >> >      >     >>  >> > >>  >> >>>> >      >      >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >> <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >>> >      >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >> >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >>>>>> wrote: >
>>>   >      >      >>         Hi Dinesh, et al., >      >      >      >>
>>>    please check the updated version that >     removed the >      >      >
>>>    reference to >      >      >      >>         Hypervisor in the text and
>>> Figure 1. >      >      >      >> >      >      >      >>         Regards,
>>> >      >      >      >>         Greg >      >      >      >> >      >
>>> >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K >      >
>>>   >      >>         >> mailto:santosh.pallagatti@gmail.com > >
>>>     <
>>> mailto:santosh.pallagatti@gmail.com >> >
>>>     >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >>>
>>> >      >      >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >> >
>>>     >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >>>>
>>> >      >      >      >>  >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >> >
>>>     >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >>>
>>> >      >      >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >> >
>>>     >     >>  >> > >     <
>>> mailto:santosh.pallagatti@gmail.com  <
>>> mailto:santosh.pallagatti@gmail.com >>>>>>
>>> wrote: >      >      >      >> >      >      >      >>             Dinesh,
>>> >      >      >      >>                  Please see my inline comments
>>> [SPK] >      >      >      >> >      >      >      >> >      >      >
>>> >>                 - In section 3, there's a sentence >     that >      >
>>>    is: "BFD >      >      >      >>                 packets intended for a
>>> Hypervisor >     VTEP MUST >      >      >     NOT..". I >      >      >
>>>   >>                 recommend getting rid of the word >      >
>>>  "Hypervisor" ashe >      >      >      >>                 logic applies to
>>> any VTEP. >      >      >      >> >      >      >      >>             [SPK]
>>> Thanks for comments. We will >     change this. >      >      >      >> >
>>>     >      >      >>                 - You already explained the >
>>>  precedence of >      >     the use of >      >      >      >>
>>>    127/8 address in the inner header in >      >     MPLS. I have no >
>>> >      >      >>                 specific comments in that area. I have >
>>>     >     only two >      >      >      >>                 questions: >
>>>   >      >      >>                    - Has anybody verified that the >
>>>  use of >      >     127/8 >      >      >      >>                 address
>>> (and the right MAC) works with >      >     existing >      >      >
>>> >>                 implementations, including the silicon >      >
>>>  ones? If this >      >      >      >>                 doesn't work there,
>>> is it worth >     adding the >      >      >     possibilit >      >
>>> >      >>                 y of another address, one that is >     owned >
>>>     >     by the >      >      >     VTEP node? >      >      >      >> >
>>>     >      >      >>                    - Do we know if Firewalls stop >
>>>  such VXLAN >      >      >     packets? >      >      >      >>
>>>      I ask this because VXLAN has an IP >     header >      >     and I >
>>>     >      >     don't >      >      >      >>                 know if
>>> firewalls stop packets >     with 127/8 >      >     in the >      >
>>> >     inner >      >      >      >>                 header. If not, is it
>>> worth adding a >      >     sentence to say >      >      >      >>
>>>          that firewalls  allow such >     packets? The >      >     use of
>>> a >      >      >      >>                 non-127/8 address may alleviate
>>> >     this case >      >     as well. >      >      >      >> >      >
>>> >      >>             [SPK] I think we may need to add the text >      >
>>>  about firewall >      >      >      >>             as some checks in
>>> firewall will be >     there if >      >     they are not >      >      >
>>>     >>             already using MPLS OAM which has inner IP >      >
>>>  header with >      >      >      >>             127/8 address range. >
>>>   >      >      >> >      >      >      >> >      >      >      >>
>>>        The rest of the draft looks good >     to me, >      >      >
>>> >> >      >      >      >>                 Dinesh >      >      >      >>
>>> >      >      >      >>                 On Wed, Oct 23, 2019 at 7:58 AM, >
>>>    Greg Mirsky >      >      >      >>                 <
>>> gregimirsky@gmail.com >> > >     >>  >> >> >      >     >>  >> > >>  >> >>> >      >      >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >> <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >>>> >      >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >> >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >>> >      >
>>> >      <
>>> mailto:gregimirsky@gmail.com > >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >> <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >>>>>> >      >
>>>   >      >>                 wrote: >      >      >      >>>
>>>  Hi Dinesh, >      >      >      >>>                 I greatly appreciate
>>> your comments. >      >     Please heave a >      >      >      >>>
>>>          look at the attached copy of the >     working >      >      >
>>>  version and >      >      >      >>>                 its diff to -07
>>> (latest in the >     datatracker). >      >      >      >>> >      >
>>> >      >>>                 Regards, >      >      >      >>>
>>>  Greg >      >      >      >>> >      >      >      >>>                 On
>>> Tue, Oct 22, 2019 at 9:52 PM >     Dinesh Dutt >      >      >      >>>
>>>              >> > >      <
>>> mailto:didutt@gmail.com >> >      >     <
>>> mailto:didutt@gmail.com  >> >  <
>>> mailto:didutt@gmail.com >>> >     <
>>> mailto:didutt@gmail.com  >> >  <
>>> mailto:didutt@gmail.com >> >      >     <
>>> mailto:didutt@gmail.com  >> >  <
>>> mailto:didutt@gmail.com >>>> >      >      >     <
>>> mailto:didutt@gmail.com  >> >  <
>>> mailto:didutt@gmail.com >> >     <
>>> mailto:didutt@gmail.com  >> >  <
>>> mailto:didutt@gmail.com >>> >      >     <
>>> mailto:didutt@gmail.com  >> >  <
>>> mailto:didutt@gmail.com >> >     <
>>> mailto:didutt@gmail.com  >> >  <
>>> mailto:didutt@gmail.com >>>>>> wrote: >      >
>>> >      >>> >      >      >      >>>                     I have the same
>>> feeling as Anoop. >      >     Greg, can you >      >      >      >>>
>>>                please point me to the latest >     draft >      >     so
>>> that >      >      >     I can >      >      >      >>>
>>>  quickly glance through it to be >      >     doubly sure, >      >      >
>>>     >>> >      >      >      >>>                     Dinesh >      >
>>> >      >>> >      >      >      >>>                     On Wed, Oct 23,
>>> 2019 at 4:35 AM, >      >     Anoop Ghanwani >      >      >      >>>
>>>                >> > >     >>  >> >> >      >     >>  >> > >>  >> >>> >      >      >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu > >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >> <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu > >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >>>> >      >
>>> >      >>>   <
>>> mailto:anoop@alumni.duke.edu > >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >> >      >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu > <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >>> >      >
>>> >      <
>>> mailto:anoop@alumni.duke.edu > >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >> >      >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu > >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
>>>   >      >      >>>>                     Greg, >      >      >      >>>> >
>>>     >      >      >>>>                     I think the draft is fine as is.
>>> >      >      >      >>>> >      >      >      >>>>                     I
>>> discussion with Xiao Min was >      >     about #3 and I >      >      >
>>>   >>>>                     see that as unnecessary until we >      >
>>>  have a draft >      >      >      >>>>                     that explains
>>> why that is >     needed in the >      >      >     context >      >
>>> >      >>>>                     of the NVO3 architecture. >      >      >
>>>     >>>> >      >      >      >>>>                     Anoop >      >
>>> >      >>>> >      >      >      >>>>                     On Tue, Oct 22,
>>> 2019 at 11:17 AM >      >     Greg Mirsky >      >      >      >>>>  <
>>> gregimirsky@gmail.com >> > >     >>  >> >> >      >     >>  >> > >>  >> >>> >      >      >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >> <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >>>> >      >
>>> >      >>>> >       >>  >> > >>  >> >> >      >     >>  >> > >>  >> >>> >      >      >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >> >      >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com > >     <
>>> mailto:gregimirsky@gmail.com  <
>>> mailto:gregimirsky@gmail.com >>>>>> wrote: >
>>>   >      >      >>>> >      >      >      >>>>                         Hi
>>> Anoop, et al., >      >      >      >>>>                         I agree
>>> with your >     understanding >      >     of what is >      >      >
>>> >>>>                         being defined in the current >      >
>>>  version >      >      >     of the >      >      >      >>>>
>>>            BFD over VxLAN >     specification. >      >     But, as I >
>>>   >      >      >>>>                         understand, the WG is >
>>> >     discussing the scope >      >      >      >>>>
>>>  before the WGLC is closed. I >      >     believe there >      >      >
>>>   >>>>                         are three options: >      >      >      >>>>
>>> >      >      >      >>>>                          1. single BFD session >
>>>    between >      >     two VTEPs >      >      >      >>>>
>>>           2. single BFD session >     per VNI >      >     between >
>>> >      >     two VTEPs >      >      >      >>>>
>>> 3. multiple BFD >     sessions per >      >     VNI between >      >
>>> >      >>>>                             two VTEPs >      >      >      >>>>
>>> >      >      >      >>>>                         The current text >
>>>  reflects #2. Is WG >      >      >     accepts >      >      >      >>>>
>>>                        this scope? If not, which >      >     option WG
>>> would >      >      >      >>>>                         accept? >      >
>>>   >      >>>> >      >      >      >>>>                         Regards, >
>>>     >      >      >>>>                         Greg >      >      >
>>> >>>> >      >      >      >>>>                         On Tue, Oct 22, 2019
>>> at >     2:09 PM >      >     Anoop >      >      >      >>>>
>>>            Ghanwani >     >> mailto:anoop@alumni.duke.edu > <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >> >      >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu > <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >>> >      >
>>> >      <
>>> mailto:anoop@alumni.duke.edu > >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >> <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu > >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >>>> >      >
>>> >      >>>> >       >>  >> > >>  >> >> >      >     >>  >> > >>  >> >>> >      >      >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu > >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >> >      >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu > >     <
>>> mailto:anoop@alumni.duke.edu  <
>>> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
>>>   >      >      >>>> >      >      >      >>>>
>>>  I concur with Joel's >     assessment >      >      >     with the >
>>> >      >      >>>>                             following >
>>>  clarifications. >      >      >      >>>> >      >      >      >>>>
>>>                      The current document >     is already >      >      >
>>>    capable >      >      >      >>>>                             of
>>> monitoring >     multiple VNIs >      >      >     between VTEPs. >      >
>>>     >      >>>> >      >      >      >>>>                             The
>>> issue under >     discussion >      >     was how >      >      >     do we
>>> >      >      >      >>>>                             use BFD to monitor >
>>>    multiple >      >     VAPs that >      >      >      >>>>
>>>              use the same VNI >     between a >      >     pair of >
>>> >      >      >>>>                             VTEPs.  The use case for >
>>>     >     this is not >      >      >      >>>>
>>>  clear to me, as from my >      >     understanding, >      >      >
>>> >>>>                             we cannot have a >     situation with >
>>>   >      >     multiple >      >      >      >>>>
>>>    VAPs using the same >      >     VNI--there is 1:1 >      >      >
>>> >>>>                             mapping between VAP >     and VNI. >
>>> >      >      >>>> >      >      >      >>>>
>>>  Anoop >      >      >      >>>> >      >      >      >>>>
>>>            On Tue, Oct 22, 2019 >     at 6:06 AM >      >      >     Joel
>>> M. >      >      >      >>>>                             Halpern >      >
>>>    >> > 
>>> >> >     <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com > <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >>> >      >      >
>>>   <
>>> mailto:jmh@joelhalpern.com > >     <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >> <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com > >     <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >>>> >      >      >
>>>   >>>> >        <
>>> mailto:jmh@joelhalpern.com > <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >> >      >     <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com > <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >>> >      >      >
>>>   <
>>> mailto:jmh@joelhalpern.com > >     <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >> <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com > >     <
>>> mailto:jmh@joelhalpern.com  <
>>> mailto:jmh@joelhalpern.com >>>>>> >      >
>>>  wrote: >      >      >      >>>> >      >      >      >>>>
>>>                   From what I can >     tell, >      >     there >      >
>>>     >     are two >      >      >      >>>>
>>>  separate problems. >      >      >      >>>>
>>>    The document we >     have is a >      >      >     VTEP-VTEP >      >
>>>     >      >>>>                                 monitoring >     document.
>>> >      >     There is no >      >      >      >>>>
>>>        need for that >     document to >      >      >     handle the >
>>>   >      >      >>>>                                 multiple VNI case. >
>>>     >      >      >>>>                                 If folks want a >
>>>   >     protocol for doing >      >      >      >>>>
>>>          BFD monitoring >     of things >      >      >     behind the >
>>>   >      >      >>>>                                 VTEPs (multiple >
>>>  VNIs), >      >     then do >      >      >     that >      >      >
>>> >>>>                                 as a separate >      >     document.
>>>  The >      >      >      >>>>                                 encoding
>>> will be >     a tenant >      >      >     encoding, >      >      >
>>> >>>>                                 and thus >     sesparate from >
>>> >     what is >      >      >      >>>>
>>>  defined in this >     document. >      >      >      >>>> >      >      >
>>>     >>>>                                 Yours, >      >      >      >>>>
>>>                                Joel >      >      >      >>>> >      >
>>> >      >>>>                                 On 10/21/2019 >     5:07 PM, >
>>>     >     Jeffrey >      >      >     Haas >      >      >      >>>>
>>>                          wrote: >      >      >      >>>>
>>>                > Santosh and >     others, >      >      >      >>>>
>>>                          > >      >      >      >>>>
>>>          > On Thu, Oct >     03, 2019 at >      >      >     07:50:20PM >
>>>     >      >      >>>>                                 +0530, Santosh P >
>>>    K wrote: >      >      >      >>>>                                 >>
>>>  Thanks >     for your >      >      >     explanation. >      >      >
>>>   >>>>                                 This helps a lot. I >      >
>>>  would wait >      >      >     for more >      >      >      >>>>
>>>                        >> comments from >     others >      >     to see if
>>> >      >      >      >>>>                                 this what we >
>>>  need in this >      >      >     draft to be >      >      >      >>>>
>>>                              >> supported >     based on >      >     that
>>> we can >      >      >      >>>>                                 provide
>>> appropriate >      >     sections >      >      >     in the >      >
>>> >      >>>>                                 draft. >      >      >
>>> >>>>                                 > >      >      >      >>>>
>>>                      > The threads on the >      >     list have >      >
>>>     >      >>>>                                 spidered to the >     point
>>> >      >     where it is >      >      >      >>>>
>>>        challenging >      >      >      >>>>
>>>  > to follow what the >      >     current >      >      >     status >
>>>   >      >      >>>>                                 of the draft is, >
>>>  or should >      >      >     be.  :-) >      >      >      >>>>
>>>                        > >      >      >      >>>>
>>>        > However, if I've >      >     followed things >      >      >
>>> >>>>                                 properly, the >     question >      >
>>>    below is >      >      >      >>>>
>>>  really the >      >      >      >>>>                                 >
>>> hinge point on >     what our >      >      >      >>>>
>>>              encapsulation >     for BFD >      >     over vxlan >      >
>>>     >      >>>>                                 should look like. >      >
>>>     >      >>>>                                 > Correct? >      >      >
>>>     >>>>                                 > >      >      >      >>>>
>>>                          > Essentially, >     do we or >      >     do we
>>> not >      >      >      >>>>                                 require the
>>> >     ability to >      >     permit >      >      >      >>>>
>>>                    multiple BFD >      >      >      >>>>
>>>                > sessions between >      >     distinct VAPs? >      >
>>> >      >>>>                                 > >      >      >      >>>>
>>>                              > If this is so, >     do we >      >     have
>>> a >      >      >     sense >      >      >      >>>>
>>>            as to how we should >      >     proceed? >      >      >
>>> >>>>                                 > >      >      >      >>>>
>>>                      > -- Jeff >      >      >      >>>>
>>>              > >      >      >      >>>>                                 >
>>> [context preserved >      >     below...] >      >      >      >>>>
>>>                          > >      >      >      >>>>
>>>          >> Santosh P K >      >      >      >>>>
>>>        >> >      >      >      >>>>                                 >> On
>>> Wed, Sep >     25, 2019 >      >     at 8:10 AM >      >      >      >>>>
>>> >       >> > >>  >> >> >      >     >>  >> > >>  >> >>> >      >      >     <
>>> mailto:xiao.min2@zte.com.cn  <
>>> mailto:xiao.min2@zte.com.cn > >     <
>>> mailto:xiao.min2@zte.com.cn  <
>>> mailto:xiao.min2@zte.com.cn >> <
>>> mailto:xiao.min2@zte.com.cn  <
>>> mailto:xiao.min2@zte.com.cn > >     <
>>> mailto:xiao.min2@zte.com.cn  <
>>> mailto:xiao.min2@zte.com.cn >>>> >      >      >
>>>     >>>> >      >       >>  >> > >>  >> >> >     >>  >> > >>  >> >>> >      >      >     <
>>> mailto:xiao.min2@zte.com.cn  <
>>> mailto:xiao.min2@zte.com.cn > >     <
>>> mailto:xiao.min2@zte.com.cn  <
>>> mailto:xiao.min2@zte.com.cn >> <
>>> mailto:xiao.min2@zte.com.cn  <
>>> mailto:xiao.min2@zte.com.cn > >     <
>>> mailto:xiao.min2@zte.com.cn  <
>>> mailto:xiao.min2@zte.com.cn >>>>>> >      >
>>>  wrote: >      >      >      >>>>                                 >> >
>>> >      >      >>>>                                 >>> Hi Santosh, >
>>> >      >      >>>>                                 >>> >      >      >
>>> >>>>                                 >>> >      >      >      >>>>
>>>                        >>> With regard >     to the >      >     question
>>> >      >      >      >>>>                                 whether we >
>>>  should allow >      >      >     multiple BFD >      >      >      >>>>
>>>                              sessions >      >      >      >>>>
>>>                      >>> for the same >     VNI or >      >     not, >
>>> >      >     IMHO we >      >      >      >>>>
>>>    should allow it, >     more >      >      >     explanation as >      >
>>>     >      >>>>                                 >>> follows. >      >
>>> >      >>>>                                 >>> >      >      >      >>>>
>>>                                >>> Below is a >     figure >      >
>>>  derived from >      >      >      >>>>
>>>  figure 2 of >     RFC8014 (An >      >      >     Architecture for >
>>> >      >      >>>>                                 >>> Data-Center >
>>>  Network >      >      >      >>>>  Virtualization >     over Layer 3 >
>>>   >      >     (NVO3)). >      >      >      >>>>
>>>        >>> >      >      >      >>>>                                 >>> >
>>>             | >      >      >      >>>>
>>>   Data Center Network >      >     (IP)        | >      >      >      >>>>
>>>                                >>> >              | >      >      >
>>> >>>> >      >             | >      >      >      >>>>
>>>            >>> >      >      >      >>>> >      >      >
>>>  +-----------------------------------------+ >      >      >      >>>>
>>>                            >>> >      >             | >      >      >
>>> >>>> >           | >      >      >      >>>>
>>>  >>> >      >             | >      >      >      >>>>
>>>             Tunnel Overlay >          | >      >      >      >>>>
>>>                        >>> >      >      >      >>>> >
>>>  +------------+---------+ >      >      >      >>>> >
>>>   +---------+------------+ >      >      >      >>>>
>>>          >>>         | >      >      >      >>>> >
>>>  +----------+-------+ | >      >           | >      >      >      >>>> >
>>>    +-------+----------+ | >      >      >      >>>>
>>>          >>> >     | | >      >     Overlay >      >      >      >>>>
>>>                            Module  | | >       | | >      >     Overlay >
>>>     >      >      >>>>                                 Module  | | >
>>> >      >      >>>>                                 >>>         | >      >
>>>     >      >>>> >       +---------+--------+ | >      >           | >
>>> >      >      >>>> >       +---------+--------+ | >      >      >
>>> >>>>                                 >>>         | >      >           | >
>>>     >      >      >>>>                                     |    | >
>>>      | >      >      >          | >      >      >      >>>>
>>>                  >>>  NVE1   | >      >           | >      >      >
>>> >>>>                                     |    | >             | >      >
>>>   >          | >      >      >      >>>>
>>>  NVE2 >      >      >      >>>>                                 >>>
>>> | >      >      >      >>>> >       +--------+-------+  | >      >
>>>  | >      >      >      >>>> >       +--------+-------+  | >      >      >
>>>     >>>>                                 >>> >     |  |VNI1 >      >
>>> >     VNI2  VNI1 >      >      >      >>>>
>>>  |  |  |  | VNI1 >      >     VNI2 VNI1 >      >      >     |  | >      >
>>>     >      >>>>                                 >>>         | >      >
>>> >      >>>> >       +-+-----+----+---+  | >      >           | >      >
>>>   >      >>>> >       +-+-----+-----+--+  | >      >      >      >>>>
>>>                            >>> >     |VAP1| >      >     VAP2|    | >
>>> >      >      >>>>                                 VAP3 | >       |VAP1|
>>> VAP2| >      >      >       | VAP3| >      >      >      >>>>
>>>                    >>> >      >      >      >>>> >
>>>  +----+-----+----+------+ >      >      >      >>>> >
>>>   +----+-----+-----+-----+ >      >      >      >>>>
>>>          >>> >      >       |     | >      >      >        | >      >
>>> >      >>>>        | >      >       |     | >      >      >      >>>>
>>>                            >>> >      >       |     | >      >      >
>>>   | >      >      >      >>>>        | >      >       |     | >      >
>>> >      >>>>                                 >>> >      >       |     | >
>>>   >      >        | >      >      >      >>>>        | >      >       |
>>>  | >      >      >      >>>>                                 >>> >      >
>>>     >      >>>> >      >      > >
>>>  -------+-----+----+-------------------+-----+-----+------- >      >
>>> >      >>>>                                 >>> >      >       |     | >
>>>   >      >        | >      >      >      >>>>  Tenant        | >      >
>>>    |     | >      >      >      >>>>                                 >>> >
>>>    TSI1 | >      >     TSI2|    | >      >      >      >>>>
>>>                  TSI3 >     TSI1| TSI2| >      >      >       |TSI3 >
>>> >      >      >>>>                                 >>> >      >     +---+
>>> +---+ >      >      >      >>>>                                 +---+ >
>>>    +---+ >      >     +---+ >      >      >       +---+ >      >      >
>>>   >>>>                                 >>> >      >     |TS1| |TS2| >
>>> >      >      >>>>                                 |TS3| >       |TS4| >
>>>   >     |TS5| >      >      >       |TS6| >      >      >      >>>>
>>>                          >>> >      >     +---+ +---+ >      >      >
>>> >>>>                                 +---+ >       +---+ >      >     +---+
>>> >      >      >       +---+ >      >      >      >>>>
>>>            >>> >      >      >      >>>>
>>>  >>> To my >      >     understanding, the BFD >      >      >      >>>>
>>>                              sessions between >     NVE1 >      >     and
>>> NVE2 are >      >      >      >>>>                                 actually
>>> >      >      >      >>>>                                 >>> initiated and
>>> >      >     terminated >      >      >     at VAP >      >      >
>>> >>>>                                 of NVE. >      >      >      >>>>
>>>                            >>> >      >      >      >>>>
>>>              >>> If the >     network operator >      >      >     want to
>>> >      >      >      >>>>                                 set up one BFD >
>>>    session >      >     between >      >      >     VAP1 of >      >
>>> >      >>>>                                 >>> NVE1 and VAP1of >      >
>>>  NVE2, at the >      >      >      >>>>
>>>  same time >     another BFD >      >     session >      >      >
>>> >>>>                                 between VAP3 of >      >      >
>>> >>>>                                 >>> NVE1 and >     VAP3 of NVE2, >
>>>   >      >     although >      >      >      >>>>
>>>        the two BFD sessions >      >     are for >      >      >     the
>>> same >      >      >      >>>>                                 >>> VNI1, I
>>> >     believe it's >      >      >     reasonable, >      >      >
>>> >>>>                                 so that's why I >     think we >
>>> >      >     should allow it >      >      >      >>>> >      >      >
>>> >>>> >      >      >       _______________________________________________
>>> >      >      >      >>>>                                 nvo3 mailing list
>>> >      >      >      >>>> nvo3@ietf.org >> >  <
>>> mailto:nvo3@ietf.org >> >     >>  > <
>>> mailto:nvo3@ietf.org  >> >>> >      >      <
>>> mailto:nvo3@ietf.org > >>  >> >     <
>>> mailto:nvo3@ietf.org  >> >  <
>>> mailto:nvo3@ietf.org >>>> >>  > >     <
>>> mailto:nvo3@ietf.org  >> >> >      >      <
>>> mailto:nvo3@ietf.org > >>  >>> >      >
>>> >      >> >  <
>>> mailto:nvo3@ietf.org >> >     >>  > <
>>> mailto:nvo3@ietf.org  >> >>>>> >      >      >      >>>>
>>> https://www.ietf.org/mailman/listinfo/nvo3 >      >      >      >>>> >
>>>     >      > >      > >
>>>
>>>

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From nobody Wed Oct 30 13:28:18 2019
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Date: Wed, 30 Oct 2019 16:30:51 -0400
From: Jeffrey Haas 
To: Greg Mirsky 
Cc: Dinesh Dutt , Anoop Ghanwani , "Joel M. Halpern" , Santosh P K , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
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Greg,

>From the updated text:

"At the same time, a service layer BFD session may be used between the
tenants of VTEPs IP1 and IP2 to provide end-to-end fault management. In
such case, for VTEPs BFD Control packets of that session are
indistinguishable from data packets.  If end-to-end defect detection is
realized as the set of concatenated OAM domains, e.g., VM1-1 - IP1 --
IP2 - VM2-1, then the BFD session over VXLAN between VTEPs SHOULD
follow the procedures described in Section 6.8.17 [RFC5880]."

In the case that two VMs are running BFD to each other as a user application
rather than as part of the virtualized environment, it's unlikely that
they'd be treated as concatenated domains.  To do so, the tenant VMs would
have to have a sense that they are indeed virtual.

Is your intent in this text that BFD implementations on the server should
detect BFD sessions between servers and change them to a concatenated
session? 

Section 5 comment:

:   The UDP destination port and the TTL of the inner IP packet MUST be
:   validated to determine if the received packet can be processed by
:   BFD.  BFD Control packets with unknown MAC address MUST NOT be
:   forwarded to VMs.

I'd suggest pushing the second sentence into the prior section since it
deals with MAC addresses rather than the UDP procedures.

-- Jeff


On Wed, Oct 30, 2019 at 01:06:23PM -0700, Greg Mirsky wrote:
> Dear All,
> thank you for your comments, suggestions that have made the discussion the
> most helpful to the Editors. I've tried to reflect your comments in the
> updates listed below:
> 
>    - on the inner destination IP address:
> 
> OLD TEXT:
>          Destination IP: IP address MUST NOT be of one of tenant's IP
>          addresses.  IP address MAY be selected from the range 127/8 for
>          IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
> NEW TEXT:
>          Destination IP: IP address MUST NOT be of one of tenant's IP
>          addresses.  The IP address SHOULD be selected from the range 127/8
>          for IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
>          Alternatively, the destination IP address MAY be set to VTEP's
>          IP address.
> 
>    - firewall. Appended Section 3 Deployment with the following paragraph:
> 
>    As per Section 4, the inner destination IP address SHOULD be set to
>    one of the loopback addresses (127/8 range for IPv4 and
>    0:0:0:0:0:FFFF:7F00:0/104 range for IPv6).  There could be a firewall
>    configured on VTEP to block loopback addresses if set as the
>    destination IP in the inner IP header.  It is RECOMMENDED to allow
>    addresses from the loopback range through a firewall only if it is
>    used as the destination IP address in the inner IP header, and the
>    destination UDP port is set to 3784 [RFC5881].
> 
> Regarding the use of VNI 0 as the Management VNI. In Section 6 has been
> noted:
>    An implementation MAY support the use of the Management
>    VNI as control and management channel between VTEPs.  The selection
>    of the VNI number of the Management VNI MUST be controlled through
>    management plane.  An implementation MAY use VNI number 1 as the
>    default value for the Management VNI.
> 
> Attached, please find the updated working version and the diff to -07.
> Editors much appreciate your comments, suggestions, abd help to have the
> new version uploaded before the cut-off deadline.
> 
> Regards,
> Greg
> 
> On Wed, Oct 30, 2019 at 4:46 AM Dinesh Dutt  wrote:
> 
> >
> >
> > On Wed, Oct 30, 2019 at 11:40 AM, Anoop Ghanwani 
> > wrote:
> >
> > Hi Dinesh,
> >
> > Your earlier comment was about silicon, that's why I discussed only the
> > trapping issue.  As far as software goes, IP stacks would typically discard
> > packets received from a non-loopback interface if the packet's address is
> > in 127/8.  I am not sure a traditional IP stack can play here because even
> > on Tx, we have the same MAC for reaching all remote VTEPs.  It seems to me
> > the BFD module would have to be working directly with L2 frames coming off
> > the tunnel.  Kind of like if we were running LLDP between the VTEPs.
> >
> >
> > Hi Anoop,
> >
> > My earlier comment was indeed about silicon, but the packet has to go
> > through the software stack as well once it gets to the CPU. Linux-based
> > solutions such as Linux servers or Cumulus Linux or maybe even SONIC will
> > need to have a valid IP address to process the packet. Given that 127/8 is
> > already mandated by MPLS BFD, sticking with that is better than ignoring
> > the IP address. This is why I agreed with Jeffrey Haas' comment about
> > SHOULD be set.
> >
> > Dinesh
> >
> >
> > Thanks,
> > Anoop
> >
> > On Tue, Oct 29, 2019 at 10:02 PM Dinesh Dutt  wrote:
> >
> >> Trapping to the CPU would be fine based on MAC DA. But once there, a
> >> self-respecting network stack would look at the IP header to decide what to
> >> do. Ignoring it on receive may not be an option,
> >>
> >> Dinesh
> >> On Oct 30, 2019, 10:26 AM +0530, Anoop Ghanwani ,
> >> wrote:
> >>
> >> Hi Dinesh,
> >>
> >> What would break?  If messages are trapped to CPU based on the MAC DA,
> >> what is the problem?
> >>
> >> On the flip side, there are implementations running BFD today which use
> >> different addresses as specified here:
> >> http://www.openvswitch.org/support/dist-docs/vtep.5.html
> >> >>>
> >>
> >>        *b**f**d**_**c**o**n**f**i**g**_**l**o**c**a**l* *:* *b**f**d**_**d**s**t**_**i**p*: optional string
> >>               Set to an IPv4 address to set the IP address that is expected as
> >>               destination   for   received   BFD   packets.   The  default  is
> >>               *1**6**9**.**2**5**4**.**1**.**0*.
> >>
> >> >>>
> >>
> >> Thanks,
> >> Anoop
> >>
> >> On Tue, Oct 29, 2019 at 7:01 PM Dinesh Dutt  wrote:
> >>
> >>> I suspect silicon implementations will have a problem with saying that
> >>> they can be set to anything and MUST be ignored on reception. Your logic is
> >>> sound, it's just that I fear you'll break many existing implementations. I
> >>> recommend sticking with the 127/8 address for this case.
> >>>
> >>> Dinesh
> >>>
> >>> On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern 
> >>> wrote:
> >>>
> >>> In all the discussion about what VNI to use and multiple VNI support, I
> >>> lsot track. Sorry. Still, the earlier documents did not specify the IP to
> >>> use. That does NOT mean that we are required in later revisions of the
> >>> document to allow anything the client wants. Having said that, we could add
> >>> text saying that since the IP address in the BFD request in VNI 0 is
> >>> effectively meaningless, it can be set to any value on transmission and
> >>> must be ignored on reception. As far as I can tell, it is definitional that
> >>> the VtEP does not have any assigned IP address for VNI 0, so we can't
> >>> expect that address. Yours, Joel On 10/29/2019 11:10 AM, Anoop Ghanwani
> >>> wrote:
> >>>
> >>> Hi Joel, Yes, existing implementations use VNI 0 for BFD over VXLAN.
> >>> Here are a couple of references:
> >>> https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsdb-bfd-nsx.html
> >>> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-740091.html#_Toc18013665
> >>> I guess this document has been evolving and I have not kept up with it. The
> >>> version I had reviewed and commented on originally allowed for VNI 0.  The
> >>> -04 version of the draft has this:
> >>> https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7 What
> >>> version are you referring to? Thanks, Anoop On Mon, Oct 28, 2019 at 12:55
> >>> PM Joel M. Halpern  >>> >> wrote: You are saying that there are existing
> >>> implementations using VNI 0 for this?  Given that previous versions of the
> >>> spec explicitly disallowed VNI 0, I am having trouble with your objecting
> >>> that a spec for how to run over VNI 0 breask existing implementations. Note
> >>> that when there is a good technical reason, the IETF does change Internet
> >>> Drafts in ways that break early implementations.  That is the price of
> >>> standardization. Yours, Joel On 10/28/2019 2:30 PM, Anoop Ghanwani wrote: >
> >>> Hi Joel, > > Writing the spec in that way would make the current,
> >>> inter-operable > implementation of multiple vendors non-compliant with the
> >>> spec. > > Thanks, > Anoop > > On Mon, Oct 28, 2019 at 11:07 AM Joel M.
> >>> Halpern  >>> > >  >>>  >>>
> >>> wrote: > >     I assumed this was only for the case where a tenant VNI was
> >>> being used. > >     For the 0 VNI (which is what I prefer), always (MUST)
> >>> use the loopback >     address.  There are no addresses assigned to the
> >>> VTEP in that space. >     There is no IRB in that space. > >     Yours, >
> >>>    Joel > >     On 10/28/2019 1:58 PM, Anoop Ghanwani wrote: >      > Joel,
> >>> >      > >      > Are we going to qualify this by VNI?  There's a bunch of
> >>> >     implementations >      > out there that don't use a tenant IP or a
> >>> loopback with VNI 0--they >      > simply repeat the underlay IP in the
> >>> inner IPDA. >      > >      > Thanks, >      > Anoop >      > >      > On
> >>> Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern >      >>> > <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >> >      > <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com > <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >>>> wrote: >      > >
> >>>     >     I can live with saying that you SHOULD use loopback, and MAY >
> >>>  instead >      >     use >      >     an IP address in the customer space
> >>> known to be owned by the VTEP >      >     device >      >     when such
> >>> exists. >      > >      >     Yours, >      >     Joel >      > >      >
> >>>  On 10/28/2019 1:32 PM, Anoop Ghanwani wrote: >      >      > Hi Joel, >
> >>>   >      > >      >      > Perhaps we need to say use of an address owned
> >>> by the device >      >     containing >      >      > the VTEP. >      >
> >>>   > >      >      > Or are you suggesting that the use of the loopback
> >>> address >     space >      >     is a MUST? >      >      > >      >      >
> >>> Anoop >      >      > >      >      > On Mon, Oct 28, 2019 at 10:22 AM Joel
> >>> M. Halpern >      >      >>> > 
> >>> >> >     <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com > <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >>> >      >      > <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com > <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >> >     <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com > <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >>>>> wrote: >      >
> >>>     > >      >      >     There is something I am missing in your
> >>> assumption >     about IRB. >      >      > >      >      >     As I
> >>> understand VxLAN, the VTEP is under the control >     of the >      >
> >>>  operator. >      >      >     As such, it is a pure bridge.  If you run
> >>> IRB behind >     it, that >      >     is fine. >      >      >     Yes, an
> >>> operator may offer IRB.  But as I understand it, >      >     conceptually,
> >>> >      >      >     in terms of the VxLAN architecture the IRB is an entity
> >>> >      >     behind the >      >      >     VTEP, >      >      >     not
> >>> part of the VTEP. >      >      > >      >      >     Yours, >      >
> >>> >     Joel >      >      > >      >      >     On 10/28/2019 12:23 PM,
> >>> Anoop Ghanwani wrote: >      >      >      > Santosh, >      >      >
> >>> > >      >      >      > Does it have to be a MUST?  What if I am running
> >>> >     IRB and there >      >      >     are IP >      >      >      >
> >>> addresses per VNI assigned to the VTEPs? Why can the >      >     operator
> >>> not >      >      >      > choose to use those? >      >      >      > >
> >>>   >      >      > Anoop >      >      >      > >      >      >      > On
> >>> Mon, Oct 28, 2019 at 7:51 AM Santosh P K >      >      >      > <
> >>> santosh.pallagatti@gmail.com  >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >> >
> >>>     >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >>>
> >>> >      >      >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >> >
> >>>     >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >>>>
> >>> >      >      >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >> >
> >>>     >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >>>
> >>> >      >      >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >> >
> >>>     >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >>>>>>
> >>> wrote: >      >      >      > >      >      >      >     Dinesh, Anoop et
> >>> all, >      >      >      >           Lets us know if this text works for
> >>> 127/8 >      >     address range? >      >      >      > >      >      >
> >>>   >     [proposed text for firewall] >      >      >      > >      >
> >>> >      >     "As per section 4 inner destination IP address >     MUST be
> >>> >      >     set to >      >      >     127/8 >      >      >      >
> >>>  address. There may be firewall configured on >     VTEP to >      >
> >>>  block 127/8 >      >      >      >     address range if set as destination
> >>> IP in inner IP >      >     header. It is >      >      >      >
> >>>  recommended to allow 127/8 range address through >      >     firewall
> >>> only if >      >      >      >     127/8 IP address is set as destination
> >>> address >     in inner IP >      >      >     header." >      >      >
> >>> > >      >      >      > >      >      >      >     In section 4 we are
> >>> talking about using 127/8 >     and not >      >     really >      >
> >>> >     giving >      >      >      >     reason why. I think we should have
> >>> text as RFC 5884 >      >     has mentioned >      >      >      >     with
> >>> below text. >      >      >      > >      >      >      >     [From RFC
> >>> 5884] >      >      >      >     "The motivation for using the address
> >>> range >     127/8 is >      >     the same as >      >      >      >
> >>>  specified in Section 2.1 of [RFC4379] >      >      >      >  <
> >>> https://tools.ietf.org/html/rfc4379#section-2.1>. >      >     This is
> >>> an >      >      >      >     exception to the behavior defined in [RFC1122
> >>> >      >      >      >     ]." >
> >>>     >      >      > >      >      >      > >      >      >      > >      >
> >>>     >      >     Thanks >      >      >      >     Santosh P K >      >
> >>>   >      > >      >      >      > >      >      >      > >      >      >
> >>>   >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt >      >     <
> >>> didutt@gmail.com > <
> >>> mailto:didutt@gmail.com   >>> >> >      <
> >>> mailto:didutt@gmail.com >  >>>  >>> >
> >>>   >      >      <
> >>> mailto:didutt@gmail.com >  >>>  >> >     <
> >>> mailto:didutt@gmail.com   >>> >  <
> >>> mailto:didutt@gmail.com >>>> >      >      >      >
> >>>      >>> > >      <
> >>> mailto:didutt@gmail.com >>  >>>  > >     <
> >>> mailto:didutt@gmail.com   >>> >>> >      >      >>>  > <
> >>> mailto:didutt@gmail.com   >>> >> >      <
> >>> mailto:didutt@gmail.com >  >>>  >>>>>>
> >>> wrote: >      >      >      > >      >      >      >         Looks good to
> >>> me Greg. I see that the text >     around >      >     the use >      >
> >>>   >     of the >      >      >      >         inner IP address as also
> >>> quite acceptable. Will >      >     you add any >      >      >      >
> >>>    words about the firewall? >      >      >      > >      >      >      >
> >>>        Dinesh >      >      >      > >      >      >      >         On Wed,
> >>> Oct 23, 2019 at 8:36 PM, Greg Mirsky >      >      >      >         <
> >>> gregimirsky@gmail.com  >>> > >      >>>   >>> >> >      >      >>>   >>> >  >>>   >>> >>> >      >>>   >>> >  >>>   >>> >> >      >      >>>   >>> >  >>>   >>> >>>> >      >      >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >> <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >>> >      >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >> >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >>>>>> wrote: >
> >>>   >      >      >>         Hi Dinesh, et al., >      >      >      >>
> >>>    please check the updated version that >     removed the >      >      >
> >>>    reference to >      >      >      >>         Hypervisor in the text and
> >>> Figure 1. >      >      >      >> >      >      >      >>         Regards,
> >>> >      >      >      >>         Greg >      >      >      >> >      >
> >>> >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K >      >
> >>>   >      >>          >>> mailto:santosh.pallagatti@gmail.com > >
> >>>     <
> >>> mailto:santosh.pallagatti@gmail.com >> >
> >>>     >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >>>
> >>> >      >      >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >> >
> >>>     >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >>>>
> >>> >      >      >      >>   >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >> >
> >>>     >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >>>
> >>> >      >      >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >> >
> >>>     >      >>>   >>> > >     <
> >>> mailto:santosh.pallagatti@gmail.com  <
> >>> mailto:santosh.pallagatti@gmail.com >>>>>>
> >>> wrote: >      >      >      >> >      >      >      >>             Dinesh,
> >>> >      >      >      >>                  Please see my inline comments
> >>> [SPK] >      >      >      >> >      >      >      >> >      >      >
> >>> >>                 - In section 3, there's a sentence >     that >      >
> >>>    is: "BFD >      >      >      >>                 packets intended for a
> >>> Hypervisor >     VTEP MUST >      >      >     NOT..". I >      >      >
> >>>   >>                 recommend getting rid of the word >      >
> >>>  "Hypervisor" ashe >      >      >      >>                 logic applies to
> >>> any VTEP. >      >      >      >> >      >      >      >>             [SPK]
> >>> Thanks for comments. We will >     change this. >      >      >      >> >
> >>>     >      >      >>                 - You already explained the >
> >>>  precedence of >      >     the use of >      >      >      >>
> >>>    127/8 address in the inner header in >      >     MPLS. I have no >
> >>> >      >      >>                 specific comments in that area. I have >
> >>>     >     only two >      >      >      >>                 questions: >
> >>>   >      >      >>                    - Has anybody verified that the >
> >>>  use of >      >     127/8 >      >      >      >>                 address
> >>> (and the right MAC) works with >      >     existing >      >      >
> >>> >>                 implementations, including the silicon >      >
> >>>  ones? If this >      >      >      >>                 doesn't work there,
> >>> is it worth >     adding the >      >      >     possibilit >      >
> >>> >      >>                 y of another address, one that is >     owned >
> >>>     >     by the >      >      >     VTEP node? >      >      >      >> >
> >>>     >      >      >>                    - Do we know if Firewalls stop >
> >>>  such VXLAN >      >      >     packets? >      >      >      >>
> >>>      I ask this because VXLAN has an IP >     header >      >     and I >
> >>>     >      >     don't >      >      >      >>                 know if
> >>> firewalls stop packets >     with 127/8 >      >     in the >      >
> >>> >     inner >      >      >      >>                 header. If not, is it
> >>> worth adding a >      >     sentence to say >      >      >      >>
> >>>          that firewalls  allow such >     packets? The >      >     use of
> >>> a >      >      >      >>                 non-127/8 address may alleviate
> >>> >     this case >      >     as well. >      >      >      >> >      >
> >>> >      >>             [SPK] I think we may need to add the text >      >
> >>>  about firewall >      >      >      >>             as some checks in
> >>> firewall will be >     there if >      >     they are not >      >      >
> >>>     >>             already using MPLS OAM which has inner IP >      >
> >>>  header with >      >      >      >>             127/8 address range. >
> >>>   >      >      >> >      >      >      >> >      >      >      >>
> >>>        The rest of the draft looks good >     to me, >      >      >
> >>> >> >      >      >      >>                 Dinesh >      >      >      >>
> >>> >      >      >      >>                 On Wed, Oct 23, 2019 at 7:58 AM, >
> >>>    Greg Mirsky >      >      >      >>                 <
> >>> gregimirsky@gmail.com  >>> > >      >>>   >>> >> >      >      >>>   >>> >  >>>   >>> >>> >      >      >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >> <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >>>> >      >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >> >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >>> >      >
> >>> >      <
> >>> mailto:gregimirsky@gmail.com > >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >> <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >>>>>> >      >
> >>>   >      >>                 wrote: >      >      >      >>>
> >>>  Hi Dinesh, >      >      >      >>>                 I greatly appreciate
> >>> your comments. >      >     Please heave a >      >      >      >>>
> >>>          look at the attached copy of the >     working >      >      >
> >>>  version and >      >      >      >>>                 its diff to -07
> >>> (latest in the >     datatracker). >      >      >      >>> >      >
> >>> >      >>>                 Regards, >      >      >      >>>
> >>>  Greg >      >      >      >>> >      >      >      >>>                 On
> >>> Tue, Oct 22, 2019 at 9:52 PM >     Dinesh Dutt >      >      >      >>>
> >>>               >>> > >      <
> >>> mailto:didutt@gmail.com >> >      >     <
> >>> mailto:didutt@gmail.com   >>> >  <
> >>> mailto:didutt@gmail.com >>> >     <
> >>> mailto:didutt@gmail.com   >>> >  <
> >>> mailto:didutt@gmail.com >> >      >     <
> >>> mailto:didutt@gmail.com   >>> >  <
> >>> mailto:didutt@gmail.com >>>> >      >      >     <
> >>> mailto:didutt@gmail.com   >>> >  <
> >>> mailto:didutt@gmail.com >> >     <
> >>> mailto:didutt@gmail.com   >>> >  <
> >>> mailto:didutt@gmail.com >>> >      >     <
> >>> mailto:didutt@gmail.com   >>> >  <
> >>> mailto:didutt@gmail.com >> >     <
> >>> mailto:didutt@gmail.com   >>> >  <
> >>> mailto:didutt@gmail.com >>>>>> wrote: >      >
> >>> >      >>> >      >      >      >>>                     I have the same
> >>> feeling as Anoop. >      >     Greg, can you >      >      >      >>>
> >>>                please point me to the latest >     draft >      >     so
> >>> that >      >      >     I can >      >      >      >>>
> >>>  quickly glance through it to be >      >     doubly sure, >      >      >
> >>>     >>> >      >      >      >>>                     Dinesh >      >
> >>> >      >>> >      >      >      >>>                     On Wed, Oct 23,
> >>> 2019 at 4:35 AM, >      >     Anoop Ghanwani >      >      >      >>>
> >>>                 >>> > >      >>>   >>> >> >      >      >>>   >>> >  >>>   >>> >>> >      >      >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu > >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >> <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu > >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >>>> >      >
> >>> >      >>>   <
> >>> mailto:anoop@alumni.duke.edu > >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >> >      >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu > <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >>> >      >
> >>> >      <
> >>> mailto:anoop@alumni.duke.edu > >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >> >      >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu > >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
> >>>   >      >      >>>>                     Greg, >      >      >      >>>> >
> >>>     >      >      >>>>                     I think the draft is fine as is.
> >>> >      >      >      >>>> >      >      >      >>>>                     I
> >>> discussion with Xiao Min was >      >     about #3 and I >      >      >
> >>>   >>>>                     see that as unnecessary until we >      >
> >>>  have a draft >      >      >      >>>>                     that explains
> >>> why that is >     needed in the >      >      >     context >      >
> >>> >      >>>>                     of the NVO3 architecture. >      >      >
> >>>     >>>> >      >      >      >>>>                     Anoop >      >
> >>> >      >>>> >      >      >      >>>>                     On Tue, Oct 22,
> >>> 2019 at 11:17 AM >      >     Greg Mirsky >      >      >      >>>>  <
> >>> gregimirsky@gmail.com  >>> > >      >>>   >>> >> >      >      >>>   >>> >  >>>   >>> >>> >      >      >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >> <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >>>> >      >
> >>> >      >>>> >        >>>   >>> >  >>>   >>> >> >      >      >>>   >>> >  >>>   >>> >>> >      >      >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >> >      >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com > >     <
> >>> mailto:gregimirsky@gmail.com  <
> >>> mailto:gregimirsky@gmail.com >>>>>> wrote: >
> >>>   >      >      >>>> >      >      >      >>>>                         Hi
> >>> Anoop, et al., >      >      >      >>>>                         I agree
> >>> with your >     understanding >      >     of what is >      >      >
> >>> >>>>                         being defined in the current >      >
> >>>  version >      >      >     of the >      >      >      >>>>
> >>>            BFD over VxLAN >     specification. >      >     But, as I >
> >>>   >      >      >>>>                         understand, the WG is >
> >>> >     discussing the scope >      >      >      >>>>
> >>>  before the WGLC is closed. I >      >     believe there >      >      >
> >>>   >>>>                         are three options: >      >      >      >>>>
> >>> >      >      >      >>>>                          1. single BFD session >
> >>>    between >      >     two VTEPs >      >      >      >>>>
> >>>           2. single BFD session >     per VNI >      >     between >
> >>> >      >     two VTEPs >      >      >      >>>>
> >>> 3. multiple BFD >     sessions per >      >     VNI between >      >
> >>> >      >>>>                             two VTEPs >      >      >      >>>>
> >>> >      >      >      >>>>                         The current text >
> >>>  reflects #2. Is WG >      >      >     accepts >      >      >      >>>>
> >>>                        this scope? If not, which >      >     option WG
> >>> would >      >      >      >>>>                         accept? >      >
> >>>   >      >>>> >      >      >      >>>>                         Regards, >
> >>>     >      >      >>>>                         Greg >      >      >
> >>> >>>> >      >      >      >>>>                         On Tue, Oct 22, 2019
> >>> at >     2:09 PM >      >     Anoop >      >      >      >>>>
> >>>            Ghanwani >      >>> mailto:anoop@alumni.duke.edu > <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >> >      >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu > <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >>> >      >
> >>> >      <
> >>> mailto:anoop@alumni.duke.edu > >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >> <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu > >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >>>> >      >
> >>> >      >>>> >        >>>   >>> >  >>>   >>> >> >      >      >>>   >>> >  >>>   >>> >>> >      >      >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu > >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >> >      >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu > >     <
> >>> mailto:anoop@alumni.duke.edu  <
> >>> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
> >>>   >      >      >>>> >      >      >      >>>>
> >>>  I concur with Joel's >     assessment >      >      >     with the >
> >>> >      >      >>>>                             following >
> >>>  clarifications. >      >      >      >>>> >      >      >      >>>>
> >>>                      The current document >     is already >      >      >
> >>>    capable >      >      >      >>>>                             of
> >>> monitoring >     multiple VNIs >      >      >     between VTEPs. >      >
> >>>     >      >>>> >      >      >      >>>>                             The
> >>> issue under >     discussion >      >     was how >      >      >     do we
> >>> >      >      >      >>>>                             use BFD to monitor >
> >>>    multiple >      >     VAPs that >      >      >      >>>>
> >>>              use the same VNI >     between a >      >     pair of >
> >>> >      >      >>>>                             VTEPs.  The use case for >
> >>>     >     this is not >      >      >      >>>>
> >>>  clear to me, as from my >      >     understanding, >      >      >
> >>> >>>>                             we cannot have a >     situation with >
> >>>   >      >     multiple >      >      >      >>>>
> >>>    VAPs using the same >      >     VNI--there is 1:1 >      >      >
> >>> >>>>                             mapping between VAP >     and VNI. >
> >>> >      >      >>>> >      >      >      >>>>
> >>>  Anoop >      >      >      >>>> >      >      >      >>>>
> >>>            On Tue, Oct 22, 2019 >     at 6:06 AM >      >      >     Joel
> >>> M. >      >      >      >>>>                             Halpern >      >
> >>>     >>> > 
> >>> >> >     <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com > <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >>> >      >      >
> >>>   <
> >>> mailto:jmh@joelhalpern.com > >     <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >> <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com > >     <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >>>> >      >      >
> >>>   >>>> >        <
> >>> mailto:jmh@joelhalpern.com > <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >> >      >     <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com > <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >>> >      >      >
> >>>   <
> >>> mailto:jmh@joelhalpern.com > >     <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >> <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com > >     <
> >>> mailto:jmh@joelhalpern.com  <
> >>> mailto:jmh@joelhalpern.com >>>>>> >      >
> >>>  wrote: >      >      >      >>>> >      >      >      >>>>
> >>>                   From what I can >     tell, >      >     there >      >
> >>>     >     are two >      >      >      >>>>
> >>>  separate problems. >      >      >      >>>>
> >>>    The document we >     have is a >      >      >     VTEP-VTEP >      >
> >>>     >      >>>>                                 monitoring >     document.
> >>> >      >     There is no >      >      >      >>>>
> >>>        need for that >     document to >      >      >     handle the >
> >>>   >      >      >>>>                                 multiple VNI case. >
> >>>     >      >      >>>>                                 If folks want a >
> >>>   >     protocol for doing >      >      >      >>>>
> >>>          BFD monitoring >     of things >      >      >     behind the >
> >>>   >      >      >>>>                                 VTEPs (multiple >
> >>>  VNIs), >      >     then do >      >      >     that >      >      >
> >>> >>>>                                 as a separate >      >     document.
> >>>  The >      >      >      >>>>                                 encoding
> >>> will be >     a tenant >      >      >     encoding, >      >      >
> >>> >>>>                                 and thus >     sesparate from >
> >>> >     what is >      >      >      >>>>
> >>>  defined in this >     document. >      >      >      >>>> >      >      >
> >>>     >>>>                                 Yours, >      >      >      >>>>
> >>>                                Joel >      >      >      >>>> >      >
> >>> >      >>>>                                 On 10/21/2019 >     5:07 PM, >
> >>>     >     Jeffrey >      >      >     Haas >      >      >      >>>>
> >>>                          wrote: >      >      >      >>>>
> >>>                > Santosh and >     others, >      >      >      >>>>
> >>>                          > >      >      >      >>>>
> >>>          > On Thu, Oct >     03, 2019 at >      >      >     07:50:20PM >
> >>>     >      >      >>>>                                 +0530, Santosh P >
> >>>    K wrote: >      >      >      >>>>                                 >>
> >>>  Thanks >     for your >      >      >     explanation. >      >      >
> >>>   >>>>                                 This helps a lot. I >      >
> >>>  would wait >      >      >     for more >      >      >      >>>>
> >>>                        >> comments from >     others >      >     to see if
> >>> >      >      >      >>>>                                 this what we >
> >>>  need in this >      >      >     draft to be >      >      >      >>>>
> >>>                              >> supported >     based on >      >     that
> >>> we can >      >      >      >>>>                                 provide
> >>> appropriate >      >     sections >      >      >     in the >      >
> >>> >      >>>>                                 draft. >      >      >
> >>> >>>>                                 > >      >      >      >>>>
> >>>                      > The threads on the >      >     list have >      >
> >>>     >      >>>>                                 spidered to the >     point
> >>> >      >     where it is >      >      >      >>>>
> >>>        challenging >      >      >      >>>>
> >>>  > to follow what the >      >     current >      >      >     status >
> >>>   >      >      >>>>                                 of the draft is, >
> >>>  or should >      >      >     be.  :-) >      >      >      >>>>
> >>>                        > >      >      >      >>>>
> >>>        > However, if I've >      >     followed things >      >      >
> >>> >>>>                                 properly, the >     question >      >
> >>>    below is >      >      >      >>>>
> >>>  really the >      >      >      >>>>                                 >
> >>> hinge point on >     what our >      >      >      >>>>
> >>>              encapsulation >     for BFD >      >     over vxlan >      >
> >>>     >      >>>>                                 should look like. >      >
> >>>     >      >>>>                                 > Correct? >      >      >
> >>>     >>>>                                 > >      >      >      >>>>
> >>>                          > Essentially, >     do we or >      >     do we
> >>> not >      >      >      >>>>                                 require the
> >>> >     ability to >      >     permit >      >      >      >>>>
> >>>                    multiple BFD >      >      >      >>>>
> >>>                > sessions between >      >     distinct VAPs? >      >
> >>> >      >>>>                                 > >      >      >      >>>>
> >>>                              > If this is so, >     do we >      >     have
> >>> a >      >      >     sense >      >      >      >>>>
> >>>            as to how we should >      >     proceed? >      >      >
> >>> >>>>                                 > >      >      >      >>>>
> >>>                      > -- Jeff >      >      >      >>>>
> >>>              > >      >      >      >>>>                                 >
> >>> [context preserved >      >     below...] >      >      >      >>>>
> >>>                          > >      >      >      >>>>
> >>>          >> Santosh P K >      >      >      >>>>
> >>>        >> >      >      >      >>>>                                 >> On
> >>> Wed, Sep >     25, 2019 >      >     at 8:10 AM >      >      >      >>>>
> >>> >        >>> >  >>>   >>> >> >      >      >>>   >>> >  >>>   >>> >>> >      >      >     <
> >>> mailto:xiao.min2@zte.com.cn  <
> >>> mailto:xiao.min2@zte.com.cn > >     <
> >>> mailto:xiao.min2@zte.com.cn  <
> >>> mailto:xiao.min2@zte.com.cn >> <
> >>> mailto:xiao.min2@zte.com.cn  <
> >>> mailto:xiao.min2@zte.com.cn > >     <
> >>> mailto:xiao.min2@zte.com.cn  <
> >>> mailto:xiao.min2@zte.com.cn >>>> >      >      >
> >>>     >>>> >      >        >>>   >>> >  >>>   >>> >> >      >>>   >>> >  >>>   >>> >>> >      >      >     <
> >>> mailto:xiao.min2@zte.com.cn  <
> >>> mailto:xiao.min2@zte.com.cn > >     <
> >>> mailto:xiao.min2@zte.com.cn  <
> >>> mailto:xiao.min2@zte.com.cn >> <
> >>> mailto:xiao.min2@zte.com.cn  <
> >>> mailto:xiao.min2@zte.com.cn > >     <
> >>> mailto:xiao.min2@zte.com.cn  <
> >>> mailto:xiao.min2@zte.com.cn >>>>>> >      >
> >>>  wrote: >      >      >      >>>>                                 >> >
> >>> >      >      >>>>                                 >>> Hi Santosh, >
> >>> >      >      >>>>                                 >>> >      >      >
> >>> >>>>                                 >>> >      >      >      >>>>
> >>>                        >>> With regard >     to the >      >     question
> >>> >      >      >      >>>>                                 whether we >
> >>>  should allow >      >      >     multiple BFD >      >      >      >>>>
> >>>                              sessions >      >      >      >>>>
> >>>                      >>> for the same >     VNI or >      >     not, >
> >>> >      >     IMHO we >      >      >      >>>>
> >>>    should allow it, >     more >      >      >     explanation as >      >
> >>>     >      >>>>                                 >>> follows. >      >
> >>> >      >>>>                                 >>> >      >      >      >>>>
> >>>                                >>> Below is a >     figure >      >
> >>>  derived from >      >      >      >>>>
> >>>  figure 2 of >     RFC8014 (An >      >      >     Architecture for >
> >>> >      >      >>>>                                 >>> Data-Center >
> >>>  Network >      >      >      >>>>  Virtualization >     over Layer 3 >
> >>>   >      >     (NVO3)). >      >      >      >>>>
> >>>        >>> >      >      >      >>>>                                 >>> >
> >>>             | >      >      >      >>>>
> >>>   Data Center Network >      >     (IP)        | >      >      >      >>>>
> >>>                                >>> >              | >      >      >
> >>> >>>> >      >             | >      >      >      >>>>
> >>>            >>> >      >      >      >>>> >      >      >
> >>>  +-----------------------------------------+ >      >      >      >>>>
> >>>                            >>> >      >             | >      >      >
> >>> >>>> >           | >      >      >      >>>>
> >>>  >>> >      >             | >      >      >      >>>>
> >>>             Tunnel Overlay >          | >      >      >      >>>>
> >>>                        >>> >      >      >      >>>> >
> >>>  +------------+---------+ >      >      >      >>>> >
> >>>   +---------+------------+ >      >      >      >>>>
> >>>          >>>         | >      >      >      >>>> >
> >>>  +----------+-------+ | >      >           | >      >      >      >>>> >
> >>>    +-------+----------+ | >      >      >      >>>>
> >>>          >>> >     | | >      >     Overlay >      >      >      >>>>
> >>>                            Module  | | >       | | >      >     Overlay >
> >>>     >      >      >>>>                                 Module  | | >
> >>> >      >      >>>>                                 >>>         | >      >
> >>>     >      >>>> >       +---------+--------+ | >      >           | >
> >>> >      >      >>>> >       +---------+--------+ | >      >      >
> >>> >>>>                                 >>>         | >      >           | >
> >>>     >      >      >>>>                                     |    | >
> >>>      | >      >      >          | >      >      >      >>>>
> >>>                  >>>  NVE1   | >      >           | >      >      >
> >>> >>>>                                     |    | >             | >      >
> >>>   >          | >      >      >      >>>>
> >>>  NVE2 >      >      >      >>>>                                 >>>
> >>> | >      >      >      >>>> >       +--------+-------+  | >      >
> >>>  | >      >      >      >>>> >       +--------+-------+  | >      >      >
> >>>     >>>>                                 >>> >     |  |VNI1 >      >
> >>> >     VNI2  VNI1 >      >      >      >>>>
> >>>  |  |  |  | VNI1 >      >     VNI2 VNI1 >      >      >     |  | >      >
> >>>     >      >>>>                                 >>>         | >      >
> >>> >      >>>> >       +-+-----+----+---+  | >      >           | >      >
> >>>   >      >>>> >       +-+-----+-----+--+  | >      >      >      >>>>
> >>>                            >>> >     |VAP1| >      >     VAP2|    | >
> >>> >      >      >>>>                                 VAP3 | >       |VAP1|
> >>> VAP2| >      >      >       | VAP3| >      >      >      >>>>
> >>>                    >>> >      >      >      >>>> >
> >>>  +----+-----+----+------+ >      >      >      >>>> >
> >>>   +----+-----+-----+-----+ >      >      >      >>>>
> >>>          >>> >      >       |     | >      >      >        | >      >
> >>> >      >>>>        | >      >       |     | >      >      >      >>>>
> >>>                            >>> >      >       |     | >      >      >
> >>>   | >      >      >      >>>>        | >      >       |     | >      >
> >>> >      >>>>                                 >>> >      >       |     | >
> >>>   >      >        | >      >      >      >>>>        | >      >       |
> >>>  | >      >      >      >>>>                                 >>> >      >
> >>>     >      >>>> >      >      > >
> >>>  -------+-----+----+-------------------+-----+-----+------- >      >
> >>> >      >>>>                                 >>> >      >       |     | >
> >>>   >      >        | >      >      >      >>>>  Tenant        | >      >
> >>>    |     | >      >      >      >>>>                                 >>> >
> >>>    TSI1 | >      >     TSI2|    | >      >      >      >>>>
> >>>                  TSI3 >     TSI1| TSI2| >      >      >       |TSI3 >
> >>> >      >      >>>>                                 >>> >      >     +---+
> >>> +---+ >      >      >      >>>>                                 +---+ >
> >>>    +---+ >      >     +---+ >      >      >       +---+ >      >      >
> >>>   >>>>                                 >>> >      >     |TS1| |TS2| >
> >>> >      >      >>>>                                 |TS3| >       |TS4| >
> >>>   >     |TS5| >      >      >       |TS6| >      >      >      >>>>
> >>>                          >>> >      >     +---+ +---+ >      >      >
> >>> >>>>                                 +---+ >       +---+ >      >     +---+
> >>> >      >      >       +---+ >      >      >      >>>>
> >>>            >>> >      >      >      >>>>
> >>>  >>> To my >      >     understanding, the BFD >      >      >      >>>>
> >>>                              sessions between >     NVE1 >      >     and
> >>> NVE2 are >      >      >      >>>>                                 actually
> >>> >      >      >      >>>>                                 >>> initiated and
> >>> >      >     terminated >      >      >     at VAP >      >      >
> >>> >>>>                                 of NVE. >      >      >      >>>>
> >>>                            >>> >      >      >      >>>>
> >>>              >>> If the >     network operator >      >      >     want to
> >>> >      >      >      >>>>                                 set up one BFD >
> >>>    session >      >     between >      >      >     VAP1 of >      >
> >>> >      >>>>                                 >>> NVE1 and VAP1of >      >
> >>>  NVE2, at the >      >      >      >>>>
> >>>  same time >     another BFD >      >     session >      >      >
> >>> >>>>                                 between VAP3 of >      >      >
> >>> >>>>                                 >>> NVE1 and >     VAP3 of NVE2, >
> >>>   >      >     although >      >      >      >>>>
> >>>        the two BFD sessions >      >     are for >      >      >     the
> >>> same >      >      >      >>>>                                 >>> VNI1, I
> >>> >     believe it's >      >      >     reasonable, >      >      >
> >>> >>>>                                 so that's why I >     think we >
> >>> >      >     should allow it >      >      >      >>>> >      >      >
> >>> >>>> >      >      >       _______________________________________________
> >>> >      >      >      >>>>                                 nvo3 mailing list
> >>> >      >      >      >>>> nvo3@ietf.org  >>> >  <
> >>> mailto:nvo3@ietf.org >> >      >>>  > <
> >>> mailto:nvo3@ietf.org   >>> >>> >      >      <
> >>> mailto:nvo3@ietf.org >  >>>  >> >     <
> >>> mailto:nvo3@ietf.org   >>> >  <
> >>> mailto:nvo3@ietf.org >>>>  >>>  > >     <
> >>> mailto:nvo3@ietf.org   >>> >> >      >      <
> >>> mailto:nvo3@ietf.org >  >>>  >>> >      >
> >>> >       >>> >  <
> >>> mailto:nvo3@ietf.org >> >      >>>  > <
> >>> mailto:nvo3@ietf.org   >>> >>>>> >      >      >      >>>>
> >>> https://www.ietf.org/mailman/listinfo/nvo3 >      >      >      >>>> >
> >>>     >      > >      > >
> >>>
> >>>

> 
> 
> 
> 
> BFD                                                   S. Pallagatti, Ed.
> Internet-Draft                                                    VMware
> Intended status: Standards Track                             S. Paragiri
> Expires: May 2, 2020                              Individual Contributor
>                                                              V. Govindan
>                                                             M. Mudigonda
>                                                                    Cisco
>                                                                G. Mirsky
>                                                                ZTE Corp.
>                                                         October 30, 2019
> 
> 
>                              BFD for VXLAN
>                         draft-ietf-bfd-vxlan-08
> 
> Abstract
> 
>    This document describes the use of the Bidirectional Forwarding
>    Detection (BFD) protocol in point-to-point Virtual eXtensible Local
>    Area Network (VXLAN) tunnels forming up an overlay network.
> 
> Status of This Memo
> 
>    This Internet-Draft is submitted in full conformance with the
>    provisions of BCP 78 and BCP 79.
> 
>    Internet-Drafts are working documents of the Internet Engineering
>    Task Force (IETF).  Note that other groups may also distribute
>    working documents as Internet-Drafts.  The list of current Internet-
>    Drafts is at https://datatracker.ietf.org/drafts/current/.
> 
>    Internet-Drafts are draft documents valid for a maximum of six months
>    and may be updated, replaced, or obsoleted by other documents at any
>    time.  It is inappropriate to use Internet-Drafts as reference
>    material or to cite them other than as "work in progress."
> 
>    This Internet-Draft will expire on May 2, 2020.
> 
> Copyright Notice
> 
>    Copyright (c) 2019 IETF Trust and the persons identified as the
>    document authors.  All rights reserved.
> 
>    This document is subject to BCP 78 and the IETF Trust's Legal
>    Provisions Relating to IETF Documents
>    (https://trustee.ietf.org/license-info) in effect on the date of
>    publication of this document.  Please review these documents
>    carefully, as they describe your rights and restrictions with respect
> 
> 
> 
> Pallagatti, et al.         Expires May 2, 2020                  [Page 1]
> 
> Internet-Draft                BFD for VXLAN                 October 2019
> 
> 
>    to this document.  Code Components extracted from this document must
>    include Simplified BSD License text as described in Section 4.e of
>    the Trust Legal Provisions and are provided without warranty as
>    described in the Simplified BSD License.
> 
> Table of Contents
> 
>    1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
>    2.  Conventions used in this document . . . . . . . . . . . . . .   3
>      2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
>      2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
>    3.  Deployment  . . . . . . . . . . . . . . . . . . . . . . . . .   4
>    4.  BFD Packet Transmission over VXLAN Tunnel . . . . . . . . . .   5
>    5.  Reception of BFD Packet from VXLAN Tunnel . . . . . . . . . .   7
>      5.1.  Demultiplexing of the BFD Packet  . . . . . . . . . . . .   8
>    6.  Use of the Specific VNI . . . . . . . . . . . . . . . . . . .   8
>    7.  Echo BFD  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
>    8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
>    9.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
>    10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   9
>    11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
>    12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
>      12.1.  Normative References . . . . . . . . . . . . . . . . . .   9
>      12.2.  Informational References . . . . . . . . . . . . . . . .  10
>    Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10
> 
> 1.  Introduction
> 
>    "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348] provides an
>    encapsulation scheme that allows building an overlay network by
>    decoupling the address space of the attached virtual hosts from that
>    of the network.
> 
>    One use of VXLAN is in data centers interconnecting virtual machines
>    (VMs) of a tenant.  VXLAN addresses requirements of the Layer 2 and
>    Layer 3 data center network infrastructure in the presence of VMs in
>    a multi-tenant environment by providing a Layer 2 overlay scheme on a
>    Layer 3 network [RFC7348].  Another use is as an encapsulation for
>    Ethernet VPN [RFC8365].
> 
>    This document is written assuming the use of VXLAN for virtualized
>    hosts and refers to VMs and VXLAN Tunnel End Points (VTEPs) in
>    hypervisors.  However, the concepts are equally applicable to non-
>    virtualized hosts attached to VTEPs in switches.
> 
>    In the absence of a router in the overlay, a VM can communicate with
>    another VM only if they are on the same VXLAN segment.  VMs are
>    unaware of VXLAN tunnels as a VXLAN tunnel is terminated on a VTEP.
> 
> 
> 
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> 
>    VTEPs are responsible for encapsulating and decapsulating frames
>    exchanged among VMs.
> 
>    Ability to monitor path continuity, i.e., perform proactive
>    continuity check (CC) for point-to-point (p2p) VXLAN tunnels, is
>    important.  The asynchronous mode of BFD, as defined in [RFC5880], is
>    used to monitor a p2p VXLAN tunnel.
> 
>    In the case where a Multicast Service Node (MSN) (as described in
>    Section 3.3 of [RFC8293]) resides behind a Network Virtualization
>    Endpoint (NVE), the mechanisms described in this document apply and
>    can, therefore, be used to test the connectivity from the source NVE
>    to the MSN.
> 
>    This document describes the use of Bidirectional Forwarding Detection
>    (BFD) protocol to enable monitoring continuity of the path between
>    VXLAN VTEPs, performing as Network Virtualization Endpoints, and/or
>    availability of a replicator multicast service node.
> 
> 2.  Conventions used in this document
> 
> 2.1.  Terminology
> 
>    BFD Bidirectional Forwarding Detection
> 
>    CC Continuity Check
> 
>    p2p Point-to-point
> 
>    MSN Multicast Service Node
> 
>    NVE Network Virtualization Endpoint
> 
>    VFI Virtual Forwarding Instance
> 
>    VM Virtual Machine
> 
>    VNI VXLAN Network Identifier (or VXLAN Segment ID)
> 
>    VTEP VXLAN Tunnel End Point
> 
>    VXLAN Virtual eXtensible Local Area Network
> 
> 2.2.  Requirements Language
> 
>    The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
>    "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
>    "OPTIONAL" in this document are to be interpreted as described in BCP
> 
> 
> 
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> 
>    14 [RFC2119] [RFC8174] when, and only when, they appear in all
>    capitals, as shown here.
> 
> 3.  Deployment
> 
>    Figure 1 illustrates the scenario with two servers, each of them
>    hosting two VMs.  The servers host VTEPs that terminate two VXLAN
>    tunnels with VXLAN Network Identifier (VNI) number 100 and 200
>    respectively.  Separate BFD sessions can be established between the
>    VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100
>    and 200).  An implementation that supports this specification MUST be
>    able to control the number of BFD sessions that can be created
>    between the same pair of VTEPs.  BFD packets intended for a VTEP MUST
>    NOT be forwarded to a VM as a VM may drop BFD packets leading to a
>    false negative.  This method is applicable whether the VTEP is a
>    virtual or physical device.
> 
> 
>       +------------+-------------+
>       |        Server 1          |
>       | +----+----+  +----+----+ |
>       | |VM1-1    |  |VM1-2    | |
>       | |VNI 100  |  |VNI 200  | |
>       | |         |  |         | |
>       | +---------+  +---------+ |
>       |        VTEP (IP1)        |
>       +--------------------------+
>                             |
>                             |   +-------------+
>                             |   |   Layer 3   |
>                             +---|   Network   |
>                                 +-------------+
>                                     |
>                                     +-----------+
>                                                 |
>                                          +------------+-------------+
>                                          |         VTEP (IP2)       |
>                                          | +----+----+  +----+----+ |
>                                          | |VM2-1    |  |VM2-2    | |
>                                          | |VNI 100  |  |VNI 200  | |
>                                          | |         |  |         | |
>                                          | +---------+  +---------+ |
>                                          |      Server 2            |
>                                          +--------------------------+
> 
> 
>                      Figure 1: Reference VXLAN Domain
> 
> 
> 
> 
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> 
>    At the same time, a service layer BFD session may be used between the
>    tenants of VTEPs IP1 and IP2 to provide end-to-end fault management.
>    In such case, for VTEPs BFD Control packets of that session are
>    indistinguishable from data packets.  If end-to-end defect detection
>    is realized as the set of concatenated OAM domains, e.g., VM1-1 - IP1
>    -- IP2 - VM2-1, then the BFD session over VXLAN between VTEPs SHOULD
>    follow the procedures described in Section 6.8.17 [RFC5880].
> 
>    As per Section 4, the inner destination IP address SHOULD be set to
>    one of the loopback addresses (127/8 range for IPv4 and
>    0:0:0:0:0:FFFF:7F00:0/104 range for IPv6).  There could be a firewall
>    configured on VTEP to block loopback addresses if set as the
>    destination IP in the inner IP header.  It is RECOMMENDED to allow
>    addresses from the loopback range through a firewall only if it is
>    used as the destination IP address in the inner IP header, and the
>    destination UDP port is set to 3784 [RFC5881].
> 
> 4.  BFD Packet Transmission over VXLAN Tunnel
> 
>    BFD packet MUST be encapsulated and sent to a remote VTEP as
>    explained in this section.  Implementations SHOULD ensure that the
>    BFD packets follow the same lookup path as VXLAN data packets within
>    the sender system.
> 
>    BFD packets are encapsulated in VXLAN as described below.  The VXLAN
>    packet format is defined in Section 5 of [RFC7348].  The Outer IP/UDP
>    and VXLAN headers MUST be encoded by the sender as defined in
>    [RFC7348].
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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> 
>      0                   1                   2                   3
>      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |                                                               |
>     ~                      Outer Ethernet Header                    ~
>     |                                                               |
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |                                                               |
>     ~                        Outer IPvX Header                      ~
>     |                                                               |
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |                                                               |
>     ~                        Outer UDP Header                       ~
>     |                                                               |
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |                                                               |
>     ~                           VXLAN Header                        ~
>     |                                                               |
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |                                                               |
>     ~                    Inner Ethernet Header                      ~
>     |                                                               |
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |                                                               |
>     ~                        Inner IPvX Header                      ~
>     |                                                               |
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |                                                               |
>     ~                         Inner UDP Header                      ~
>     |                                                               |
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |                                                               |
>     ~                       BFD Control Packet                     ~
>     |                                                               |
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>     |                            FCS                                |
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> 
>             Figure 2: VXLAN Encapsulation of BFD Control Packet
> 
>    The BFD packet MUST be carried inside the inner Ethernet frame of the
>    VXLAN packet.  The choice of Destination MAC and Destination IP
>    addresses for the inner Ethernet frame MUST ensure that the BFD
>    Control packet is not forwarded to a tenant but is processed locally
>    at the remote VTEP.  The inner Ethernet frame carrying the BFD
>    Control packet- has the following format:
> 
>       Ethernet Header:
> 
> 
> 
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> 
>          Destination MAC: This MUST NOT be of one of tenant's MAC
>          addresses.  The destination MAC address MAY be the address
>          associated with the destination VTEP.  The MAC address MAY be
>          configured, or it MAY be learned via a control plane protocol.
>          The details of how the MAC address is obtained are outside the
>          scope of this document.
> 
>          Source MAC: MAC address associated with the originating VTEP
> 
>       IP header:
> 
>          Destination IP: IP address MUST NOT be of one of tenant's IP
>          addresses.  The IP address SHOULD be selected from the range
>          127/8 for IPv4, for IPv6 - from the range
>          0:0:0:0:0:FFFF:7F00:0/104.  Alternatively, the destination IP
>          address MAY be set to VTEP's IP address.
> 
>          Source IP: IP address of the originating VTEP.
> 
>          TTL or Hop Limit: MUST be set to 1 to ensure that the BFD
>          packet is not routed within the Layer 3 underlay network.  This
>          addresses the scenario when the inner IP destination address is
>          of VXLAN gateway and there is a router in underlay which
>          removes the VXLAN header, then it is possible to route the
>          packet as VXLAN  gateway address is routable address.
> 
>       The fields of the UDP header and the BFD Control packet are
>       encoded as specified in [RFC5881].
> 
> 5.  Reception of BFD Packet from VXLAN Tunnel
> 
>    Once a packet is received, VTEP MUST validate the packet.  If the
>    Destination MAC of the inner Ethernet frame matches one of the MAC
>    addresses associated with the VTEP the packet MUST be processed
>    further.  If the Destination MAC of the inner Ethernet frame doesn't
>    match any of VTEP's MAC addresses, then the processing of the
>    received VXLAN packet MUST follow the procedures described in
>    Section 4.1 [RFC7348].
> 
>    The UDP destination port and the TTL of the inner IP packet MUST be
>    validated to determine if the received packet can be processed by
>    BFD.  BFD Control packets with unknown MAC address MUST NOT be
>    forwarded to VMs.
> 
> 
> 
> 
> 
> 
> 
> 
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> 
> 5.1.  Demultiplexing of the BFD Packet
> 
>    Demultiplexing of IP BFD packet has been defined in Section 3 of
>    [RFC5881].  Since multiple BFD sessions may be running between two
>    VTEPs, there needs to be a mechanism for demultiplexing received BFD
>    packets to the proper session.  For demultiplexing packets with Your
>    Discriminator equal to 0, a BFD session MUST be identified using the
>    logical link over which the BFD Control packet is received.  In the
>    case of VXLAN, the VNI number identifies that logical link.  If BFD
>    packet is received with non-zero Your Discriminator, then BFD session
>    MUST be demultiplexed only with Your Discriminator as the key.
> 
> 6.  Use of the Specific VNI
> 
>    In most cases, a single BFD session is sufficient for the given VTEP
>    to monitor the reachability of a remote VTEP, regardless of the
>    number of VNIs.  When the single BFD session is used to monitor the
>    reachability of the remote VTEP, an implementation SHOULD choose any
>    of the VNIs.  An implementation MAY support the use of the Management
>    VNI as control and management channel between VTEPs.  The selection
>    of the VNI number of the Management VNI MUST be controlled through
>    management plane.  An implementation MAY use VNI number 1 as the
>    default value for the Management VNI.  All VXLAN packets received on
>    the Management VNI MUST be processed locally and MUST NOT be
>    forwarded to a tenant.
> 
> 7.  Echo BFD
> 
>    Support for echo BFD is outside the scope of this document.
> 
> 8.  IANA Considerations
> 
>    This specification has no IANA action requested.  This section may be
>    deleted before the publication.
> 
> 9.  Security Considerations
> 
>    The document requires setting the inner IP TTL to 1, which could be
>    used as a DDoS attack vector.  Thus the implementation MUST have
>    throttling in place to control the rate of BFD Control packets sent
>    to the control plane.  On the other hand, over-aggressive throttling
>    of BFD Control packets may become the cause of the inability to form
>    and maintain BFD session at scale.  Hence, throttling of BFD Control
>    packets SHOULD be adjusted to permit BFD to work according to its
>    procedures.
> 
>    If the implementation supports establishing multiple BFD sessions
>    between the same pair of VTEPs, there SHOULD be a mechanism to
> 
> 
> 
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> 
>    control the maximum number of such sessions that can be active at the
>    same time.
> 
>    Other than inner IP TTL set to 1 and limit the number of BFD sessions
>    between the same pair of VTEPs, this specification does not raise any
>    additional security issues beyond those of the specifications
>    referred to in the list of normative references.
> 
> 10.  Contributors
> 
> 
>    Reshad Rahman
>    rrahman@cisco.com
>    Cisco
> 
> 
> 11.  Acknowledgments
> 
>    Authors would like to thank Jeff Haas of Juniper Networks for his
>    reviews and feedback on this material.
> 
>    Authors would also like to thank Nobo Akiya, Marc Binderberger,
>    Shahram Davari, Donald E.  Eastlake 3rd, and Anoop Ghanwani for the
>    extensive reviews and the most detailed and helpful comments.
> 
> 12.  References
> 
> 12.1.  Normative References
> 
>    [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
>               Requirement Levels", BCP 14, RFC 2119,
>               DOI 10.17487/RFC2119, March 1997,
>               .
> 
>    [RFC5880]  Katz, D. and D. Ward, "Bidirectional Forwarding Detection
>               (BFD)", RFC 5880, DOI 10.17487/RFC5880, June 2010,
>               .
> 
>    [RFC5881]  Katz, D. and D. Ward, "Bidirectional Forwarding Detection
>               (BFD) for IPv4 and IPv6 (Single Hop)", RFC 5881,
>               DOI 10.17487/RFC5881, June 2010,
>               .
> 
> 
> 
> 
> 
> 
> 
> 
> 
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> 
>    [RFC7348]  Mahalingam, M., Dutt, D., Duda, K., Agarwal, P., Kreeger,
>               L., Sridhar, T., Bursell, M., and C. Wright, "Virtual
>               eXtensible Local Area Network (VXLAN): A Framework for
>               Overlaying Virtualized Layer 2 Networks over Layer 3
>               Networks", RFC 7348, DOI 10.17487/RFC7348, August 2014,
>               .
> 
>    [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
>               2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
>               May 2017, .
> 
> 12.2.  Informational References
> 
>    [RFC8293]  Ghanwani, A., Dunbar, L., McBride, M., Bannai, V., and R.
>               Krishnan, "A Framework for Multicast in Network
>               Virtualization over Layer 3", RFC 8293,
>               DOI 10.17487/RFC8293, January 2018,
>               .
> 
>    [RFC8365]  Sajassi, A., Ed., Drake, J., Ed., Bitar, N., Shekhar, R.,
>               Uttaro, J., and W. Henderickx, "A Network Virtualization
>               Overlay Solution Using Ethernet VPN (EVPN)", RFC 8365,
>               DOI 10.17487/RFC8365, March 2018,
>               .
> 
> Authors' Addresses
> 
>    Santosh Pallagatti (editor)
>    VMware
> 
>    Email: santosh.pallagatti@gmail.com
> 
> 
>    Sudarsan Paragiri
>    Individual Contributor
> 
>    Email: sudarsan.225@gmail.com
> 
> 
>    Vengada Prasad Govindan
>    Cisco
> 
>    Email: venggovi@cisco.com
> 
> 
> 
> 
> 
> 
> 
> 
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> 
>    Mallik Mudigonda
>    Cisco
> 
>    Email: mmudigon@cisco.com
> 
> 
>    Greg Mirsky
>    ZTE Corp.
> 
>    Email: gregimirsky@gmail.com
> 
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< draft-ietf-bfd-vxlan-07.txt   draft-ietf-bfd-vxlan-08.txt >
 
BFD                                                   S. Pallagatti, Ed. BFD                                                   S. Pallagatti, Ed.
Internet-Draft                                                   Rtbrick Internet-Draft                                                    VMware
Intended status: Standards Track                             S. Paragiri Intended status: Standards Track                             S. Paragiri
Expires: November 18, 2019                        Individual Contributor Expires: May 2, 2020                              Individual Contributor
                                                             V. Govindan                                                              V. Govindan
                                                            M. Mudigonda                                                             M. Mudigonda
                                                                   Cisco                                                                    Cisco
                                                               G. Mirsky                                                                G. Mirsky
                                                               ZTE Corp.                                                                ZTE Corp.
                                                            May 17, 2019                                                         October 30, 2019
 
                             BFD for VXLAN                              BFD for VXLAN
                        draft-ietf-bfd-vxlan-07                         draft-ietf-bfd-vxlan-08
 
Abstract Abstract
 
   This document describes the use of the Bidirectional Forwarding    This document describes the use of the Bidirectional Forwarding
   Detection (BFD) protocol in point-to-point Virtual eXtensible Local    Detection (BFD) protocol in point-to-point Virtual eXtensible Local
   Area Network (VXLAN) tunnels forming up an overlay network.    Area Network (VXLAN) tunnels forming up an overlay network.
 
Status of This Memo Status of This Memo
 
   This Internet-Draft is submitted in full conformance with the    This Internet-Draft is submitted in full conformance with the
 
skipping to change at page 1, line 38  skipping to change at page 1, line 38 
   Internet-Drafts are working documents of the Internet Engineering    Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute    Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-    working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.    Drafts is at https://datatracker.ietf.org/drafts/current/.
 
   Internet-Drafts are draft documents valid for a maximum of six months    Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any    and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference    time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."    material or to cite them other than as "work in progress."
 
   This Internet-Draft will expire on November 18, 2019.    This Internet-Draft will expire on May 2, 2020.
 
Copyright Notice Copyright Notice
 
   Copyright (c) 2019 IETF Trust and the persons identified as the    Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.    document authors.  All rights reserved.
 
   This document is subject to BCP 78 and the IETF Trust's Legal    This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents    Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of    (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents    publication of this document.  Please review these documents
 
skipping to change at page 2, line 17  skipping to change at page 2, line 17 
   described in the Simplified BSD License.    described in the Simplified BSD License.
 
Table of Contents Table of Contents
 
   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2    1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3    2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3      2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3      2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  Deployment  . . . . . . . . . . . . . . . . . . . . . . . . .   4    3.  Deployment  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  BFD Packet Transmission over VXLAN Tunnel . . . . . . . . . .   5    4.  BFD Packet Transmission over VXLAN Tunnel . . . . . . . . . .   5
     4.1.  BFD Packet Encapsulation in VXLAN . . . . . . . . . . . .   6 
   5.  Reception of BFD Packet from VXLAN Tunnel . . . . . . . . . .   7    5.  Reception of BFD Packet from VXLAN Tunnel . . . . . . . . . .   7
     5.1.  Demultiplexing of the BFD Packet  . . . . . . . . . . . .   7      5.1.  Demultiplexing of the BFD Packet  . . . . . . . . . . . .   8
   6.  Use of the Specific VNI . . . . . . . . . . . . . . . . . . .   8    6.  Use of the Specific VNI . . . . . . . . . . . . . . . . . . .   8
   7.  Echo BFD  . . . . . . . . . . . . . . . . . . . . . . . . . .   8    7.  Echo BFD  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8    8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   8    9.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8    10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   9
   11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9    11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9    12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     12.1.  Normative References . . . . . . . . . . . . . . . . . .   9      12.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     12.2.  Informational References . . . . . . . . . . . . . . . .   9      12.2.  Informational References . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10    Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10
 
1.  Introduction 1.  Introduction
 
   "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348] provides an    "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348] provides an
   encapsulation scheme that allows building an overlay network by    encapsulation scheme that allows building an overlay network by
   decoupling the address space of the attached virtual hosts from that    decoupling the address space of the attached virtual hosts from that
   of the network.    of the network.
 
   One use of VXLAN is in data centers interconnecting virtual machines    One use of VXLAN is in data centers interconnecting virtual machines
 
skipping to change at page 3, line 5  skipping to change at page 3, line 4 
   Ethernet VPN [RFC8365].    Ethernet VPN [RFC8365].
 
   This document is written assuming the use of VXLAN for virtualized    This document is written assuming the use of VXLAN for virtualized
   hosts and refers to VMs and VXLAN Tunnel End Points (VTEPs) in    hosts and refers to VMs and VXLAN Tunnel End Points (VTEPs) in
   hypervisors.  However, the concepts are equally applicable to non-    hypervisors.  However, the concepts are equally applicable to non-
   virtualized hosts attached to VTEPs in switches.    virtualized hosts attached to VTEPs in switches.
 
   In the absence of a router in the overlay, a VM can communicate with    In the absence of a router in the overlay, a VM can communicate with
   another VM only if they are on the same VXLAN segment.  VMs are    another VM only if they are on the same VXLAN segment.  VMs are
   unaware of VXLAN tunnels as a VXLAN tunnel is terminated on a VTEP.    unaware of VXLAN tunnels as a VXLAN tunnel is terminated on a VTEP.
                                                                          
   VTEPs are responsible for encapsulating and decapsulating frames    VTEPs are responsible for encapsulating and decapsulating frames
   exchanged among VMs.    exchanged among VMs.
 
   Ability to monitor path continuity, i.e., perform proactive    Ability to monitor path continuity, i.e., perform proactive
   continuity check (CC) for point-to-point (p2p) VXLAN tunnels, is    continuity check (CC) for point-to-point (p2p) VXLAN tunnels, is
   important.  The asynchronous mode of BFD, as defined in [RFC5880],    important.  The asynchronous mode of BFD, as defined in [RFC5880], is
   can be used to monitor a p2p VXLAN tunnel.    used to monitor a p2p VXLAN tunnel.
 
   In the case where a Multicast Service Node (MSN) (as described in    In the case where a Multicast Service Node (MSN) (as described in
   Section 3.3 of [RFC8293]) resides behind an NVE, the mechanisms    Section 3.3 of [RFC8293]) resides behind a Network Virtualization
   described in this document apply and can, therefore, be used to test    Endpoint (NVE), the mechanisms described in this document apply and
   the connectivity from the source NVE to the MSN.    can, therefore, be used to test the connectivity from the source NVE
    to the MSN.
 
   This document describes the use of Bidirectional Forwarding Detection    This document describes the use of Bidirectional Forwarding Detection
   (BFD) protocol to enable monitoring continuity of the path between    (BFD) protocol to enable monitoring continuity of the path between
   VXLAN VTEPs, performing as Network Virtualization Endpoints, and/or    VXLAN VTEPs, performing as Network Virtualization Endpoints, and/or
   availability of a replicator multicast service node.    availability of a replicator multicast service node.
 
2.  Conventions used in this document 2.  Conventions used in this document
 
2.1.  Terminology 2.1.  Terminology
 
   BFD Bidirectional Forwarding Detection    BFD Bidirectional Forwarding Detection
 
   CC Continuity Check    CC Continuity Check
 
   p2p Point-to-point    p2p Point-to-point
 
   MSN Multicast Service Node    MSN Multicast Service Node
 
    NVE Network Virtualization Endpoint
                                                                          
   VFI Virtual Forwarding Instance    VFI Virtual Forwarding Instance
 
   VM Virtual Machine    VM Virtual Machine
 
    VNI VXLAN Network Identifier (or VXLAN Segment ID)
                                                                          
   VTEP VXLAN Tunnel End Point    VTEP VXLAN Tunnel End Point
 
   VXLAN Virtual eXtensible Local Area Network    VXLAN Virtual eXtensible Local Area Network
 
2.2.  Requirements Language 2.2.  Requirements Language
 
   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",    The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and    "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP    "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all    14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.    capitals, as shown here.
 
3.  Deployment 3.  Deployment
 
   Figure 1 illustrates the scenario with two servers, each of them    Figure 1 illustrates the scenario with two servers, each of them
   hosting two VMs.  The servers host VTEPs that terminate two VXLAN    hosting two VMs.  The servers host VTEPs that terminate two VXLAN
   tunnels with VNI number 100 and 200 respectively.  Separate BFD    tunnels with VXLAN Network Identifier (VNI) number 100 and 200
   sessions can be established between the VTEPs (IP1 and IP2) for    respectively.  Separate BFD sessions can be established between the
   monitoring each of the VXLAN tunnels (VNI 100 and 200).  An    VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100
   implementation that supports this specification MUST be able to    and 200).  An implementation that supports this specification MUST be
   control the number of BFD sessions that can be created between the    able to control the number of BFD sessions that can be created
   same pair of VTEPs.  BFD packets intended for a Hypervisor VTEP MUST    between the same pair of VTEPs.  BFD packets intended for a VTEP MUST
   NOT be forwarded to a VM as a VM may drop BFD packets leading to a    NOT be forwarded to a VM as a VM may drop BFD packets leading to a
   false negative.  This method is applicable whether the VTEP is a    false negative.  This method is applicable whether the VTEP is a
   virtual or physical device.    virtual or physical device.
 
      +------------+-------------+       +------------+-------------+
      |        Server 1          |       |        Server 1          |
      |                          | 
      | +----+----+  +----+----+ |       | +----+----+  +----+----+ |
      | |VM1-1    |  |VM1-2    | |       | |VM1-1    |  |VM1-2    | |
      | |VNI 100  |  |VNI 200  | |       | |VNI 100  |  |VNI 200  | |
      | |         |  |         | |       | |         |  |         | |
      | +---------+  +---------+ |       | +---------+  +---------+ |
      | Hypervisor VTEP (IP1)    |       |        VTEP (IP1)        |
      +--------------------------+       +--------------------------+
                            |                             |
                            | 
                            | 
                            |   +-------------+                             |   +-------------+
                            |   |   Layer 3   |                             |   |   Layer 3   |
                            |---|   Network   |                             +---|   Network   |
                                |             | 
                                +-------------+                                 +-------------+
                                    |                                     |
                                    | 
                                    +-----------+                                     +-----------+
                                                |                                                 |
                                                | 
                                         +------------+-------------+                                          +------------+-------------+
                                         |    Hypervisor VTEP (IP2) |                                          |         VTEP (IP2)       |
                                         | +----+----+  +----+----+ |                                          | +----+----+  +----+----+ |
                                         | |VM2-1    |  |VM2-2    | |                                          | |VM2-1    |  |VM2-2    | |
                                         | |VNI 100  |  |VNI 200  | |                                          | |VNI 100  |  |VNI 200  | |
                                         | |         |  |         | |                                          | |         |  |         | |
                                         | +---------+  +---------+ |                                          | +---------+  +---------+ |
                                         |      Server 2            |                                          |      Server 2            |
                                         +--------------------------+                                          +--------------------------+
 
                     Figure 1: Reference VXLAN Domain                      Figure 1: Reference VXLAN Domain
 
    At the same time, a service layer BFD session may be used between the
    tenants of VTEPs IP1 and IP2 to provide end-to-end fault management.
    In such case, for VTEPs BFD Control packets of that session are
    indistinguishable from data packets.  If end-to-end defect detection
    is realized as the set of concatenated OAM domains, e.g., VM1-1 - IP1
    -- IP2 - VM2-1, then the BFD session over VXLAN between VTEPs SHOULD
    follow the procedures described in Section 6.8.17 [RFC5880].
 
    As per Section 4, the inner destination IP address SHOULD be set to
    one of the loopback addresses (127/8 range for IPv4 and
    0:0:0:0:0:FFFF:7F00:0/104 range for IPv6).  There could be a firewall
    configured on VTEP to block loopback addresses if set as the
    destination IP in the inner IP header.  It is RECOMMENDED to allow
    addresses from the loopback range through a firewall only if it is
    used as the destination IP address in the inner IP header, and the
    destination UDP port is set to 3784 [RFC5881].
                                                                          
4.  BFD Packet Transmission over VXLAN Tunnel 4.  BFD Packet Transmission over VXLAN Tunnel
 
   BFD packet MUST be encapsulated and sent to a remote VTEP as    BFD packet MUST be encapsulated and sent to a remote VTEP as
   explained in Section 4.1.  Implementations SHOULD ensure that the BFD    explained in this section.  Implementations SHOULD ensure that the
   packets follow the same lookup path as VXLAN data packets within the    BFD packets follow the same lookup path as VXLAN data packets within
   sender system.    the sender system.
                                                                          
4.1.  BFD Packet Encapsulation in VXLAN 
 
   BFD packets are encapsulated in VXLAN as described below.  The VXLAN    BFD packets are encapsulated in VXLAN as described below.  The VXLAN
   packet format is defined in Section 5 of [RFC7348].  The Outer IP/UDP    packet format is defined in Section 5 of [RFC7348].  The Outer IP/UDP
   and VXLAN headers MUST be encoded by the sender as defined in    and VXLAN headers MUST be encoded by the sender as defined in
   [RFC7348].    [RFC7348].
 
     0                   1                   2                   3      0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                                                               |     |                                                               |
 
skipping to change at page 6, line 44  skipping to change at page 6, line 37 
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                                                               |     |                                                               |
    ~                        Inner IPvX Header                      ~     ~                        Inner IPvX Header                      ~
    |                                                               |     |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                                                               |     |                                                               |
    ~                         Inner UDP Header                      ~     ~                         Inner UDP Header                      ~
    |                                                               |     |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                                                               |     |                                                               |
    ~                       BFD Control Message                     ~     ~                       BFD Control Packet                     ~
    |                                                               |     |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                            FCS                                |     |                            FCS                                |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
           Figure 2: VXLAN Encapsulation of BFD Control Message             Figure 2: VXLAN Encapsulation of BFD Control Packet
 
   The BFD packet MUST be carried inside the inner MAC frame of the    The BFD packet MUST be carried inside the inner Ethernet frame of the
   VXLAN packet.  The inner MAC frame carrying the BFD payload has the    VXLAN packet.  The choice of Destination MAC and Destination IP
   following format:    addresses for the inner Ethernet frame MUST ensure that the BFD
    Control packet is not forwarded to a tenant but is processed locally
    at the remote VTEP.  The inner Ethernet frame carrying the BFD
    Control packet- has the following format:
 
      Ethernet Header:       Ethernet Header:
 
         Destination MAC: This MUST be the dedicated MAC TBA (Section 8)          Destination MAC: This MUST NOT be of one of tenant's MAC
         or the MAC address of the destination VTEP.  The details of how          addresses.  The destination MAC address MAY be the address
         the MAC address of the destination VTEP is obtained are outside          associated with the destination VTEP.  The MAC address MAY be
         the scope of this document.          configured, or it MAY be learned via a control plane protocol.
          The details of how the MAC address is obtained are outside the
          scope of this document.
 
         Source MAC: MAC address of the originating VTEP          Source MAC: MAC address associated with the originating VTEP
 
      IP header:       IP header:
 
         Source IP: IP address of the originating VTEP.          Destination IP: IP address MUST NOT be of one of tenant's IP
          addresses.  The IP address SHOULD be selected from the range
          127/8 for IPv4, for IPv6 - from the range
          0:0:0:0:0:FFFF:7F00:0/104.  Alternatively, the destination IP
          address MAY be set to VTEP's IP address.
 
         Destination IP: IP address of the terminating VTEP.          Source IP: IP address of the originating VTEP.
 
         TTL: MUST be set to 1 to ensure that the BFD packet is not          TTL or Hop Limit: MUST be set to 1 to ensure that the BFD
         routed within the L3 underlay network.          packet is not routed within the Layer 3 underlay network.  This
          addresses the scenario when the inner IP destination address is
          of VXLAN gateway and there is a router in underlay which
          removes the VXLAN header, then it is possible to route the
          packet as VXLAN  gateway address is routable address.
 
      The fields of the UDP header and the BFD control packet are       The fields of the UDP header and the BFD Control packet are
      encoded as specified in [RFC5881].       encoded as specified in [RFC5881].
 
5.  Reception of BFD Packet from VXLAN Tunnel 5.  Reception of BFD Packet from VXLAN Tunnel
 
   Once a packet is received, VTEP MUST validate the packet.  If the    Once a packet is received, VTEP MUST validate the packet.  If the
   Destination MAC of the inner MAC frame matches the dedicated MAC or    Destination MAC of the inner Ethernet frame matches one of the MAC
   the MAC address of the VTEP the packet MUST be processed further.    addresses associated with the VTEP the packet MUST be processed
    further.  If the Destination MAC of the inner Ethernet frame doesn't
    match any of VTEP's MAC addresses, then the processing of the
    received VXLAN packet MUST follow the procedures described in
    Section 4.1 [RFC7348].
 
   The UDP destination port and the TTL of the inner IP packet MUST be    The UDP destination port and the TTL of the inner IP packet MUST be
   validated to determine if the received packet can be processed by    validated to determine if the received packet can be processed by
   BFD.  BFD packet with inner MAC set to VTEP or dedicated MAC address    BFD.  BFD Control packets with unknown MAC address MUST NOT be
   MUST NOT be forwarded to VMs.    forwarded to VMs.
 
5.1.  Demultiplexing of the BFD Packet 5.1.  Demultiplexing of the BFD Packet
 
   Demultiplexing of IP BFD packet has been defined in Section 3 of    Demultiplexing of IP BFD packet has been defined in Section 3 of
   [RFC5881].  Since multiple BFD sessions may be running between two    [RFC5881].  Since multiple BFD sessions may be running between two
   VTEPs, there needs to be a mechanism for demultiplexing received BFD    VTEPs, there needs to be a mechanism for demultiplexing received BFD
   packets to the proper session.  The procedure for demultiplexing    packets to the proper session.  For demultiplexing packets with Your
   packets with Your Discriminator equal to 0 is different from    Discriminator equal to 0, a BFD session MUST be identified using the
   [RFC5880].  For such packets, the BFD session MUST be identified    logical link over which the BFD Control packet is received.  In the
   using the inner headers, i.e., the source IP, the destination IP, and    case of VXLAN, the VNI number identifies that logical link.  If BFD
   the source UDP port number present in the IP header carried by the    packet is received with non-zero Your Discriminator, then BFD session
   payload of the VXLAN encapsulated packet.  The VNI of the packet    MUST be demultiplexed only with Your Discriminator as the key.
   SHOULD be used to derive interface-related information for 
   demultiplexing the packet.  If BFD packet is received with non-zero 
   Your Discriminator, then BFD session MUST be demultiplexed only with 
   Your Discriminator as the key. 
 
6.  Use of the Specific VNI 6.  Use of the Specific VNI
 
   In most cases, a single BFD session is sufficient for the given VTEP    In most cases, a single BFD session is sufficient for the given VTEP
   to monitor the reachability of a remote VTEP, regardless of the    to monitor the reachability of a remote VTEP, regardless of the
   number of VNIs in common.  When the single BFD session is used to    number of VNIs.  When the single BFD session is used to monitor the
   monitor the reachability of the remote VTEP, an implementation SHOULD    reachability of the remote VTEP, an implementation SHOULD choose any
   choose any of the VNIs but MAY choose VNI = 0.    of the VNIs.  An implementation MAY support the use of the Management
    VNI as control and management channel between VTEPs.  The selection
    of the VNI number of the Management VNI MUST be controlled through
    management plane.  An implementation MAY use VNI number 1 as the
    default value for the Management VNI.  All VXLAN packets received on
    the Management VNI MUST be processed locally and MUST NOT be
    forwarded to a tenant.
 
7.  Echo BFD 7.  Echo BFD
 
   Support for echo BFD is outside the scope of this document.    Support for echo BFD is outside the scope of this document.
 
8.  IANA Considerations 8.  IANA Considerations
 
   IANA has assigned TBA as a dedicated MAC address from the IANA 48-bit    This specification has no IANA action requested.  This section may be
   unicast MAC address registry to be used as the Destination MAC    deleted before the publication.
   address of the inner Ethernet of VXLAN when carrying BFD control 
   packets. 
 
9.  Security Considerations 9.  Security Considerations
 
   The document requires setting the inner IP TTL to 1, which could be    The document requires setting the inner IP TTL to 1, which could be
   used as a DDoS attack vector.  Thus the implementation MUST have    used as a DDoS attack vector.  Thus the implementation MUST have
   throttling in place to control the rate of BFD control packets sent    throttling in place to control the rate of BFD Control packets sent
   to the control plane.  Throttling MAY be relaxed for BFD packets    to the control plane.  On the other hand, over-aggressive throttling
   based on port number.    of BFD Control packets may become the cause of the inability to form
    and maintain BFD session at scale.  Hence, throttling of BFD Control
    packets SHOULD be adjusted to permit BFD to work according to its
    procedures.
 
   The implementation SHOULD have a reasonable upper bound on the number    If the implementation supports establishing multiple BFD sessions
   of BFD sessions that can be created between the same pair of VTEPs.    between the same pair of VTEPs, there SHOULD be a mechanism to
    control the maximum number of such sessions that can be active at the
    same time.
 
   Other than inner IP TTL set to 1 and limit the number of BFD sessions    Other than inner IP TTL set to 1 and limit the number of BFD sessions
   between the same pair of VTEPs, this specification does not raise any    between the same pair of VTEPs, this specification does not raise any
   additional security issues beyond those of the specifications    additional security issues beyond those of the specifications
   referred to in the list of normative references.    referred to in the list of normative references.
 
10.  Contributors 10.  Contributors
 
   Reshad Rahman    Reshad Rahman
   rrahman@cisco.com    rrahman@cisco.com
 
skipping to change at page 10, line 14  skipping to change at page 10, line 33 
 
   [RFC8365]  Sajassi, A., Ed., Drake, J., Ed., Bitar, N., Shekhar, R.,    [RFC8365]  Sajassi, A., Ed., Drake, J., Ed., Bitar, N., Shekhar, R.,
              Uttaro, J., and W. Henderickx, "A Network Virtualization               Uttaro, J., and W. Henderickx, "A Network Virtualization
              Overlay Solution Using Ethernet VPN (EVPN)", RFC 8365,               Overlay Solution Using Ethernet VPN (EVPN)", RFC 8365,
              DOI 10.17487/RFC8365, March 2018,               DOI 10.17487/RFC8365, March 2018,
              <https://www.rfc-editor.org/info/rfc8365>.               <https://www.rfc-editor.org/info/rfc8365>.
 
Authors' Addresses Authors' Addresses
 
   Santosh Pallagatti (editor)    Santosh Pallagatti (editor)
   Rtbrick    VMware
 
   Email: santosh.pallagatti@gmail.com    Email: santosh.pallagatti@gmail.com
 
   Sudarsan Paragiri    Sudarsan Paragiri
   Individual Contributor    Individual Contributor
 
   Email: sudarsan.225@gmail.com    Email: sudarsan.225@gmail.com
 
   Vengada Prasad Govindan    Vengada Prasad Govindan
   Cisco    Cisco
 
 End of changes. 41 change blocks. 
76 lines changed or deleted 112 lines changed or added

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From: Selvakumar Sivaraj 
To: Greg Mirsky , Dinesh Dutt 
CC: NVO3 , "draft-ietf-bfd-vxlan@ietf.org" , Anoop Ghanwani , Santosh P K , Jeffrey Haas , rtg-bfd WG , "Joel M. Halpern" , "T. Sridhar" , "xiao.min2@zte.com.cn" 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
Thread-Topic: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
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From: Greg Mirsky 
Date: Wed, 30 Oct 2019 13:48:56 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Selvakumar Sivaraj 
Cc: Dinesh Dutt , NVO3 ,  "draft-ietf-bfd-vxlan@ietf.org" , Anoop Ghanwani ,  Santosh P K , Jeffrey Haas ,  rtg-bfd WG , "Joel M. Halpern" ,  "T. Sridhar" , "xiao.min2@zte.com.cn" 
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Hi Selvakumar,
a packet can be identified as a BFD Control message by the value of the
destination UDP port field. The intention of the text you've quoted is to
suggest that if the received by VTEP packet has been identified as a BFD
control packet it SHOULD NOT be forwarded to a tenant. What to do with such
packet? I believe it must be silently dropped.
Does it make sense?

Regards,
Greg

On Wed, Oct 30, 2019 at 1:36 PM Selvakumar Sivaraj 
wrote:

> Greg,
>
>
>
> >Section 5.
>
> >If the Destination MAC of the inner Ethernet frame doesn't
>
> >   match any of VTEP's MAC addresses, then the processing of the
>
> >   received VXLAN packet MUST follow the procedures described in
>
> >   Section 4.1 [RFC7348].
>
> >BFD Control packets with unknown MAC address MUST NOT be
>
> > forwarded to VMs.
>
>
>
> If the packet doesn=E2=80=99t match VTEP mac address, the packet is forwa=
rded
> based on  Section 4.1 [RFC7348]. What is the assumption behind this
> statement =E2=80=9CBFD Control packets with unknown MAC address MUST NOT =
be
> forwarded to VMs=E2=80=9D?
>
>
>
> Thanks,
>
> Selvakumar
>
>
>
>
>
> *From: *nvo3  on behalf of Greg Mirsky <
> gregimirsky@gmail.com>
> *Date: *Wednesday, October 30, 2019 at 1:08 PM
> *To: *Dinesh Dutt 
> *Cc: *NVO3 , "draft-ietf-bfd-vxlan@ietf.org" <
> draft-ietf-bfd-vxlan@ietf.org>, Anoop Ghanwani ,
> Santosh P K , Jeffrey Haas =
,
> rtg-bfd WG , "Joel M. Halpern" ,
> "T. Sridhar" , "xiao.min2@zte.com.cn" <
> xiao.min2@zte.com.cn>
> *Subject: *Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
>
>
>
> Dear All,
>
> thank you for your comments, suggestions that have made the discussion th=
e
> most helpful to the Editors. I've tried to reflect your comments in the
> updates listed below:
>
>    - on the inner destination IP address:
>
> OLD TEXT:
>
>          Destination IP: IP address MUST NOT be of one of tenant's IP
>          addresses.  IP address MAY be selected from the range 127/8 for
>          IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
>
> NEW TEXT:
>
>          Destination IP: IP address MUST NOT be of one of tenant's IP
>          addresses.  The IP address SHOULD be selected from the range 127=
/8
>          for IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
>          Alternatively, the destination IP address MAY be set to VTEP's
>          IP address.
>
>    - firewall. Appended Section 3 Deployment with the following paragraph=
:
>
>    As per Section 4, the inner destination IP address SHOULD be set to
>    one of the loopback addresses (127/8 range for IPv4 and
>    0:0:0:0:0:FFFF:7F00:0/104 range for IPv6).  There could be a firewall
>    configured on VTEP to block loopback addresses if set as the
>    destination IP in the inner IP header.  It is RECOMMENDED to allow
>    addresses from the loopback range through a firewall only if it is
>    used as the destination IP address in the inner IP header, and the
>    destination UDP port is set to 3784 [RFC5881].
>
>
>
> Regarding the use of VNI 0 as the Management VNI. In Section 6 has been
> noted:
>
>    An implementation MAY support the use of the Management
>    VNI as control and management channel between VTEPs.  The selection
>    of the VNI number of the Management VNI MUST be controlled through
>    management plane.  An implementation MAY use VNI number 1 as the
>    default value for the Management VNI.
>
>
>
> Attached, please find the updated working version and the diff to -07.
>
> Editors much appreciate your comments, suggestions, abd help to have the
> new version uploaded before the cut-off deadline.
>
>
>
> Regards,
>
> Greg
>
>
>
> On Wed, Oct 30, 2019 at 4:46 AM Dinesh Dutt  wrote:
>
>
>
>
> On Wed, Oct 30, 2019 at 11:40 AM, Anoop Ghanwani 
> wrote:
>
> Hi Dinesh,
>
>
>
> Your earlier comment was about silicon, that's why I discussed only the
> trapping issue.  As far as software goes, IP stacks would typically disca=
rd
> packets received from a non-loopback interface if the packet's address is
> in 127/8.  I am not sure a traditional IP stack can play here because eve=
n
> on Tx, we have the same MAC for reaching all remote VTEPs.  It seems to m=
e
> the BFD module would have to be working directly with L2 frames coming of=
f
> the tunnel.  Kind of like if we were running LLDP between the VTEPs.
>
>
>
> Hi Anoop,
>
>
>
> My earlier comment was indeed about silicon, but the packet has to go
> through the software stack as well once it gets to the CPU. Linux-based
> solutions such as Linux servers or Cumulus Linux or maybe even SONIC will
> need to have a valid IP address to process the packet. Given that 127/8 i=
s
> already mandated by MPLS BFD, sticking with that is better than ignoring
> the IP address. This is why I agreed with Jeffrey Haas' comment about
> SHOULD be set.
>
>
>
> Dinesh
>
>
>
> Thanks,
>
> Anoop
>
>
>
> On Tue, Oct 29, 2019 at 10:02 PM Dinesh Dutt  wrote:
>
> Trapping to the CPU would be fine based on MAC DA. But once there, a
> self-respecting network stack would look at the IP header to decide what =
to
> do. Ignoring it on receive may not be an option,
>
> Dinesh
>
> On Oct 30, 2019, 10:26 AM +0530, Anoop Ghanwani ,
> wrote:
>
> Hi Dinesh,
>
>
>
> What would break?  If messages are trapped to CPU based on the MAC DA,
> what is the problem?
>
>
>
> On the flip side, there are implementations running BFD today which use
> different addresses as specified here:
>
> http://www.openvswitch.org/support/dist-docs/vtep.5.html
> 
>
> >>>
>
>        *bfd_config_local* *:* *bfd_dst_ip*: optional string
>
>               Set to an IPv4 address to set the IP address that is expect=
ed as
>
>               destination   for   received   BFD   packets.   The  defaul=
t  is
>
>               *169.254.1.0*.
>
> >>>
>
>
>
> Thanks,
>
> Anoop
>
>
>
> On Tue, Oct 29, 2019 at 7:01 PM Dinesh Dutt  wrote:
>
> I suspect silicon implementations will have a problem with saying that
> they can be set to anything and MUST be ignored on reception. Your logic =
is
> sound, it's just that I fear you'll break many existing implementations. =
I
> recommend sticking with the 127/8 address for this case.
>
>
>
> Dinesh
>
>
> On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern 
> wrote:
>
> In all the discussion about what VNI to use and multiple VNI support, I
> lsot track. Sorry. Still, the earlier documents did not specify the IP to
> use. That does NOT mean that we are required in later revisions of the
> document to allow anything the client wants. Having said that, we could a=
dd
> text saying that since the IP address in the BFD request in VNI 0 is
> effectively meaningless, it can be set to any value on transmission and
> must be ignored on reception. As far as I can tell, it is definitional th=
at
> the VtEP does not have any assigned IP address for VNI 0, so we can't
> expect that address. Yours, Joel On 10/29/2019 11:10 AM, Anoop Ghanwani
> wrote:
>
> Hi Joel, Yes, existing implementations use VNI 0 for BFD over VXLAN.  Her=
e
> are a couple of references:
> https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsd=
b-bfd-nsx.html
> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-ser=
ies-switches/white-paper-c11-740091.html#_Toc18013665
> 
> I guess this document has been evolving and I have not kept up with it. T=
he
> version I had reviewed and commented on originally allowed for VNI 0.  Th=
e
> -04 version of the draft has this:
> https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7
> 
> What version are you referring to? Thanks, Anoop On Mon, Oct 28, 2019 at
> 12:55 PM Joel M. Halpern  >> wrote: You are saying that there are existing
> implementations using VNI 0 for this?  Given that previous versions of th=
e
> spec explicitly disallowed VNI 0, I am having trouble with your objecting
> that a spec for how to run over VNI 0 breask existing implementations. No=
te
> that when there is a good technical reason, the IETF does change Internet
> Drafts in ways that break early implementations.  That is the price of
> standardization. Yours, Joel On 10/28/2019 2:30 PM, Anoop Ghanwani wrote:=
 >
> Hi Joel, > > Writing the spec in that way would make the current,
> inter-operable > implementation of multiple vendors non-compliant with th=
e
> spec. > > Thanks, > Anoop > > On Mon, Oct 28, 2019 at 11:07 AM Joel M.
> Halpern  > > 
> >>> wrote: > >     I
> assumed this was only for the case where a tenant VNI was being used. > >
>    For the 0 VNI (which is what I prefer), always (MUST) use the loopback
> >     address.  There are no addresses assigned to the VTEP in that space=
.
> >     There is no IRB in that space. > >     Yours, >     Joel > >     On
> 10/28/2019 1:58 PM, Anoop Ghanwani wrote: >      > Joel, >      > >      =
>
> Are we going to qualify this by VNI?  There's a bunch of >
>  implementations >      > out there that don't use a tenant IP or a
> loopback with VNI 0--they >      > simply repeat the underlay IP in the
> inner IPDA. >      > >      > Thanks, >      > Anoop >      > >      > On
> Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern >      mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> >      > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>>> wrote: >      > >
>   >     I can live with saying that you SHOULD use loopback, and MAY >
>  instead >      >     use >      >     an IP address in the customer spac=
e
> known to be owned by the VTEP >      >     device >      >     when such
> exists. >      > >      >     Yours, >      >     Joel >      > >      >
>  On 10/28/2019 1:32 PM, Anoop Ghanwani wrote: >      >      > Hi Joel, >
>   >      > >      >      > Perhaps we need to say use of an address owned
> by the device >      >     containing >      >      > the VTEP. >      >
>   > >      >      > Or are you suggesting that the use of the loopback
> address >     space >      >     is a MUST? >      >      > >      >     =
 >
> Anoop >      >      > >      >      > On Mon, Oct 28, 2019 at 10:22 AM Jo=
el
> M. Halpern >      >      >  =
<
> mailto:jmh@joelhalpern.com >> >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>> >      >      > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>>>> wrote: >      >
>   > >      >      >     There is something I am missing in your assumptio=
n
> >     about IRB. >      >      > >      >      >     As I understand VxLA=
N,
> the VTEP is under the control >     of the >      >     operator. >      =
>
>     >     As such, it is a pure bridge.  If you run IRB behind >     it,
> that >      >     is fine. >      >      >     Yes, an operator may offer
> IRB.  But as I understand it, >      >     conceptually, >      >      >
>  in terms of the VxLAN architecture the IRB is an entity >      >
>  behind the >      >      >     VTEP, >      >      >     not part of the
> VTEP. >      >      > >      >      >     Yours, >      >      >     Joel
> >      >      > >      >      >     On 10/28/2019 12:23 PM, Anoop Ghanwan=
i
> wrote: >      >      >      > Santosh, >      >      >      > >      >
> >      > Does it have to be a MUST?  What if I am running >     IRB and
> there >      >      >     are IP >      >      >      > addresses per VNI
> assigned to the VTEPs? Why can the >      >     operator not >      >
> >      > choose to use those? >      >      >      > >      >      >     =
 >
> Anoop >      >      >      > >      >      >      > On Mon, Oct 28, 2019 =
at
> 7:51 AM Santosh P K >      >      >      >  mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>> >      >      >     <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>>> >      >      >     <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>> >      >      >     <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>>>>> wrote: >      >      >      > >
> >      >      >     Dinesh, Anoop et all, >      >      >      >
>  Lets us know if this text works for 127/8 >      >     address range? >
>   >      >      > >      >      >      >     [proposed text for firewall]
> >      >      >      > >      >      >      >     "As per section 4 inner
> destination IP address >     MUST be >      >     set to >      >      >
>  127/8 >      >      >      >     address. There may be firewall configur=
ed
> on >     VTEP to >      >     block 127/8 >      >      >      >
>  address range if set as destination IP in inner IP >      >     header. =
It
> is >      >      >      >     recommended to allow 127/8 range address
> through >      >     firewall only if >      >      >      >     127/8 IP
> address is set as destination address >     in inner IP >      >      >
>  header." >      >      >      > >      >      >      > >      >      >
>   >     In section 4 we are talking about using 127/8 >     and not >
> >     really >      >      >     giving >      >      >      >     reason
> why. I think we should have text as RFC 5884 >      >     has mentioned >
>     >      >      >     with below text. >      >      >      > >      >
>   >      >     [From RFC 5884] >      >      >      >     "The motivation
> for using the address range >     127/8 is >      >     the same as >
> >      >      >     specified in Section 2.1 of [RFC4379] >      >      >
>     >   >.
> >      >     This is an >      >      >      >     exception to the
> behavior defined in [RFC1122 >      >      >      >     <
> https://tools.ietf.org/html/rfc1122
> >].=
"
> >      >      >      > >      >      >      > >      >      >      > >
> >      >      >     Thanks >      >      >      >     Santosh P K >      =
>
>     >      > >      >      >      > >      >      >      > >      >      =
>
>     >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt >      >     <
> didutt@gmail.com > <
> mailto:didutt@gmail.com   >> >      <
> mailto:didutt@gmail.com >   >>> >
> >      >      <
> mailto:didutt@gmail.com >   >> >     <
> mailto:didutt@gmail.com   >  <
> mailto:didutt@gmail.com >>>> >      >      >      >
>    > >      <
> mailto:didutt@gmail.com >>   > >     <
> mailto:didutt@gmail.com   >>> >      >       > <
> mailto:didutt@gmail.com   >> >      <
> mailto:didutt@gmail.com >   >>>>>>
> wrote: >      >      >      > >      >      >      >         Looks good t=
o
> me Greg. I see that the text >     around >      >     the use >      >
>   >     of the >      >      >      >         inner IP address as also
> quite acceptable. Will >      >     you add any >      >      >      >
>    words about the firewall? >      >      >      > >      >      >      =
>
>        Dinesh >      >      >      > >      >      >      >         On We=
d,
> Oct 23, 2019 at 8:36 PM, Greg Mirsky >      >      >      >         <
> gregimirsky@gmail.com  > >        >> >      >        >    >>> >        >    >> >      >        >    >>>> >      >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>> >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>>>>> wrote: >
> >      >      >>         Hi Dinesh, et al., >      >      >      >>
>  please check the updated version that >     removed the >      >      >
>  reference to >      >      >      >>         Hypervisor in the text and
> Figure 1. >      >      >      >> >      >      >      >>         Regards=
,
> >      >      >      >>         Greg >      >      >      >> >      >
> >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K >      >
>   >      >>          mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>> >      >      >     <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>>> >      >      >      >>  <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>> >      >      >     <
> mailto:santosh.pallagatti@gmail.com  <
> mailto:santosh.pallagatti@gmail.com > >
>   <
> mailto:santosh.pallagatti@gmail.com >> >
>   >        > >        >>>>>> wrote: >      >      >      >> >
>   >      >      >>             Dinesh, >      >      >      >>
>       Please see my inline comments [SPK] >      >      >      >> >      =
>
>     >      >> >      >      >      >>                 - In section 3,
> there's a sentence >     that >      >     is: "BFD >      >      >
> >>                 packets intended for a Hypervisor >     VTEP MUST >
> >      >     NOT..". I >      >      >      >>                 recommend
> getting rid of the word >      >     "Hypervisor" ashe >      >      >
> >>                 logic applies to any VTEP. >      >      >      >> >
>   >      >      >>             [SPK] Thanks for comments. We will >
>  change this. >      >      >      >> >      >      >      >>
>    - You already explained the >     precedence of >      >     the use o=
f
> >      >      >      >>                 127/8 address in the inner header
> in >      >     MPLS. I have no >      >      >      >>
>  specific comments in that area. I have >      >     only two >      >
> >      >>                 questions: >      >      >      >>
>     - Has anybody verified that the >     use of >      >     127/8 >
> >      >      >>                 address (and the right MAC) works with >
>     >     existing >      >      >      >>                 implementation=
s,
> including the silicon >      >     ones? If this >      >      >      >>
>              doesn't work there, is it worth >     adding the >      >
> >     possibilit >      >      >      >>                 y of another
> address, one that is >     owned >      >     by the >      >      >
>  VTEP node? >      >      >      >> >      >      >      >>
>     - Do we know if Firewalls stop >     such VXLAN >      >      >
>  packets? >      >      >      >>                 I ask this because VXLA=
N
> has an IP >     header >      >     and I >      >      >     don't >
> >      >      >>                 know if firewalls stop packets >     wit=
h
> 127/8 >      >     in the >      >      >     inner >      >      >
> >>                 header. If not, is it worth adding a >      >
>  sentence to say >      >      >      >>                 that firewalls
>  allow such >     packets? The >      >     use of a >      >      >
> >>                 non-127/8 address may alleviate >     this case >
> >     as well. >      >      >      >> >      >      >      >>
>  [SPK] I think we may need to add the text >      >     about firewall >
>   >      >      >>             as some checks in firewall will be >
>  there if >      >     they are not >      >      >      >>
>  already using MPLS OAM which has inner IP >      >     header with >
> >      >      >>             127/8 address range. >      >      >      >>
> >      >      >      >> >      >      >      >>                 The rest =
of
> the draft looks good >     to me, >      >      >      >> >      >      >
>     >>                 Dinesh >      >      >      >> >      >      >
> >>                 On Wed, Oct 23, 2019 at 7:58 AM, >     Greg Mirsky >
>   >      >      >>                  mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>> >      >      >
>     <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>>> >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>> >      >      >
>     <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>>>>> >      >
> >      >>                 wrote: >      >      >      >>>
>  Hi Dinesh, >      >      >      >>>                 I greatly appreciate
> your comments. >      >     Please heave a >      >      >      >>>
>          look at the attached copy of the >     working >      >      >
>  version and >      >      >      >>>                 its diff to -07
> (latest in the >     datatracker). >      >      >      >>> >      >
> >      >>>                 Regards, >      >      >      >>>
>  Greg >      >      >      >>> >      >      >      >>>                 O=
n
> Tue, Oct 22, 2019 at 9:52 PM >     Dinesh Dutt >      >      >      >>>
>              >
> >       >> >      >       > <
> mailto:didutt@gmail.com   >>> >      <
> mailto:didutt@gmail.com >   >> >
> >       >  <
> mailto:didutt@gmail.com >>>> >      >      >     <
> mailto:didutt@gmail.com   >  <
> mailto:didutt@gmail.com >> >     <
> mailto:didutt@gmail.com   >  <
> mailto:didutt@gmail.com >>> >      >     <
> mailto:didutt@gmail.com   >  <
> mailto:didutt@gmail.com >> >     <
> mailto:didutt@gmail.com   >  <
> mailto:didutt@gmail.com >>>>>> wrote: >      >      >
>     >>> >      >      >      >>>                     I have the same
> feeling as Anoop. >      >     Greg, can you >      >      >      >>>
>                please point me to the latest >     draft >      >     so
> that >      >      >     I can >      >      >      >>>
>  quickly glance through it to be >      >     doubly sure, >      >      =
>
>     >>> >      >      >      >>>                     Dinesh >      >
> >      >>> >      >      >      >>>                     On Wed, Oct 23,
> 2019 at 4:35 AM, >      >     Anoop Ghanwani >      >      >      >>>
>                 > >        >> >      >        >    >>> >      >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>>> >      >      >
>     >>>   <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>> >      >      >
>     <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
> >      >      >>>>                     Greg, >      >      >      >>>> >
>   >      >      >>>>                     I think the draft is fine as is.
> >      >      >      >>>> >      >      >      >>>>                     I
> discussion with Xiao Min was >      >     about #3 and I >      >      >
>   >>>>                     see that as unnecessary until we >      >
>  have a draft >      >      >      >>>>                     that explains
> why that is >     needed in the >      >      >     context >      >
> >      >>>>                     of the NVO3 architecture. >      >      >
>     >>>> >      >      >      >>>>                     Anoop >      >
> >      >>>> >      >      >      >>>>                     On Tue, Oct 22,
> 2019 at 11:17 AM >      >     Greg Mirsky >      >      >      >>>>  <
> gregimirsky@gmail.com  > >        >> >      >        >    >>> >      >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>>> >      >      >
>     >>>> >        <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>> >      >      >
>     <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >> >      >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com > >     <
> mailto:gregimirsky@gmail.com  <
> mailto:gregimirsky@gmail.com >>>>>> wrote: >
> >      >      >>>> >      >      >      >>>>                         Hi
> Anoop, et al., >      >      >      >>>>                         I agree
> with your >     understanding >      >     of what is >      >      >
> >>>>                         being defined in the current >      >
>  version >      >      >     of the >      >      >      >>>>
>            BFD over VxLAN >     specification. >      >     But, as I >
>   >      >      >>>>                         understand, the WG is >
> >     discussing the scope >      >      >      >>>>
>  before the WGLC is closed. I >      >     believe there >      >      >
>   >>>>                         are three options: >      >      >      >>=
>>
> >      >      >      >>>>                          1. single BFD session =
>
>    between >      >     two VTEPs >      >      >      >>>>
>           2. single BFD session >     per VNI >      >     between >
> >      >     two VTEPs >      >      >      >>>>
> 3. multiple BFD >     sessions per >      >     VNI between >      >
> >      >>>>                             two VTEPs >      >      >      >>=
>>
> >      >      >      >>>>                         The current text >
>  reflects #2. Is WG >      >      >     accepts >      >      >      >>>>
>                        this scope? If not, which >      >     option WG
> would >      >      >      >>>>                         accept? >      >
>   >      >>>> >      >      >      >>>>                         Regards, =
>
>     >      >      >>>>                         Greg >      >      >
> >>>> >      >      >      >>>>                         On Tue, Oct 22, 20=
19
> at >     2:09 PM >      >     Anoop >      >      >      >>>>
>            Ghanwani >      mailto:anoop@alumni.duke.edu > <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>> >      >      >
>     <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>>> >      >      >
>     >>>> >        <
> mailto:anoop@alumni.duke.edu > <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>> >      >      >
>     <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >> >      >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu > >     <
> mailto:anoop@alumni.duke.edu  <
> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
> >      >      >>>> >      >      >      >>>>                             =
I
> concur with Joel's >     assessment >      >      >     with the >      >
>     >      >>>>                             following >     clarification=
s.
> >      >      >      >>>> >      >      >      >>>>
>      The current document >     is already >      >      >     capable >
>   >      >      >>>>                             of monitoring >
>  multiple VNIs >      >      >     between VTEPs. >      >      >      >>=
>>
> >      >      >      >>>>                             The issue under >
>  discussion >      >     was how >      >      >     do we >      >      =
>
>     >>>>                             use BFD to monitor >     multiple >
>   >     VAPs that >      >      >      >>>>                             u=
se
> the same VNI >     between a >      >     pair of >      >      >
> >>>>                             VTEPs.  The use case for >      >     th=
is
> is not >      >      >      >>>>                             clear to me,
> as from my >      >     understanding, >      >      >      >>>>
>                  we cannot have a >     situation with >      >      >
>  multiple >      >      >      >>>>                             VAPs usin=
g
> the same >      >     VNI--there is 1:1 >      >      >      >>>>
>                    mapping between VAP >     and VNI. >      >      >
> >>>> >      >      >      >>>>                             Anoop >      >
>     >      >>>> >      >      >      >>>>                             On
> Tue, Oct 22, 2019 >     at 6:06 AM >      >      >     Joel M. >      >
>   >      >>>>                             Halpern >      >     <
> jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>> >      >      >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>>> >      >      >
> >>>> >        <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> >      >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>> >      >      >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >> <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com > >     <
> mailto:jmh@joelhalpern.com  <
> mailto:jmh@joelhalpern.com >>>>>> >      >
>  wrote: >      >      >      >>>> >      >      >      >>>>
>                   From what I can >     tell, >      >     there >      >
>     >     are two >      >      >      >>>>
>  separate problems. >      >      >      >>>>
>    The document we >     have is a >      >      >     VTEP-VTEP >      >
>     >      >>>>                                 monitoring >     document=
.
> >      >     There is no >      >      >      >>>>
>        need for that >     document to >      >      >     handle the >
>   >      >      >>>>                                 multiple VNI case. >
>     >      >      >>>>                                 If folks want a >
>   >     protocol for doing >      >      >      >>>>
>          BFD monitoring >     of things >      >      >     behind the >
>   >      >      >>>>                                 VTEPs (multiple >
>  VNIs), >      >     then do >      >      >     that >      >      >
> >>>>                                 as a separate >      >     document.
>  The >      >      >      >>>>                                 encoding
> will be >     a tenant >      >      >     encoding, >      >      >
> >>>>                                 and thus >     sesparate from >
> >     what is >      >      >      >>>>
>  defined in this >     document. >      >      >      >>>> >      >      =
>
>     >>>>                                 Yours, >      >      >      >>>>
>                                Joel >      >      >      >>>> >      >
> >      >>>>                                 On 10/21/2019 >     5:07 PM, =
>
>     >     Jeffrey >      >      >     Haas >      >      >      >>>>
>                          wrote: >      >      >      >>>>
>                > Santosh and >     others, >      >      >      >>>>
>                          > >      >      >      >>>>
>          > On Thu, Oct >     03, 2019 at >      >      >     07:50:20PM >
>     >      >      >>>>                                 +0530, Santosh P >
>    K wrote: >      >      >      >>>>                                 >>
>  Thanks >     for your >      >      >     explanation. >      >      >
>   >>>>                                 This helps a lot. I >      >
>  would wait >      >      >     for more >      >      >      >>>>
>                        >> comments from >     others >      >     to see =
if
> >      >      >      >>>>                                 this what we >
>  need in this >      >      >     draft to be >      >      >      >>>>
>                              >> supported >     based on >      >     tha=
t
> we can >      >      >      >>>>                                 provide
> appropriate >      >     sections >      >      >     in the >      >
> >      >>>>                                 draft. >      >      >
> >>>>                                 > >      >      >      >>>>
>                      > The threads on the >      >     list have >      >
>     >      >>>>                                 spidered to the >     poi=
nt
> >      >     where it is >      >      >      >>>>
>        challenging >      >      >      >>>>
>  > to follow what the >      >     current >      >      >     status >
>   >      >      >>>>                                 of the draft is, >
>  or should >      >      >     be.  :-) >      >      >      >>>>
>                        > >      >      >      >>>>
>        > However, if I've >      >     followed things >      >      >
> >>>>                                 properly, the >     question >      =
>
>    below is >      >      >      >>>>
>  really the >      >      >      >>>>                                 >
> hinge point on >     what our >      >      >      >>>>
>              encapsulation >     for BFD >      >     over vxlan >      >
>     >      >>>>                                 should look like. >      =
>
>     >      >>>>                                 > Correct? >      >      =
>
>     >>>>                                 > >      >      >      >>>>
>                          > Essentially, >     do we or >      >     do we
> not >      >      >      >>>>                                 require the
> >     ability to >      >     permit >      >      >      >>>>
>                    multiple BFD >      >      >      >>>>
>                > sessions between >      >     distinct VAPs? >      >
> >      >>>>                                 > >      >      >      >>>>
>                              > If this is so, >     do we >      >     ha=
ve
> a >      >      >     sense >      >      >      >>>>
>            as to how we should >      >     proceed? >      >      >
> >>>>                                 > >      >      >      >>>>
>                      > -- Jeff >      >      >      >>>>
>              > >      >      >      >>>>                                 =
>
> [context preserved >      >     below...] >      >      >      >>>>
>                          > >      >      >      >>>>
>          >> Santosh P K >      >      >      >>>>
>        >> >      >      >      >>>>                                 >> On
> Wed, Sep >     25, 2019 >      >     at 8:10 AM >      >      >      >>>>
> >        >   >>
> >      >      <
> mailto:xiao.min2@zte.com.cn > <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >>> >      >      >
>   <
> mailto:xiao.min2@zte.com.cn > >     <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >> <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn > >     <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >>>> >      >      >
>   >>>> >      >       
> > <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >> >     <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn > <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >>> >      >      >
>   <
> mailto:xiao.min2@zte.com.cn > >     <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >> <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn > >     <
> mailto:xiao.min2@zte.com.cn  <
> mailto:xiao.min2@zte.com.cn >>>>>> >      >
>  wrote: >      >      >      >>>>                                 >> >
> >      >      >>>>                                 >>> Hi Santosh, >
> >      >      >>>>                                 >>> >      >      >
> >>>>                                 >>> >      >      >      >>>>
>                        >>> With regard >     to the >      >     question
> >      >      >      >>>>                                 whether we >
>  should allow >      >      >     multiple BFD >      >      >      >>>>
>                              sessions >      >      >      >>>>
>                      >>> for the same >     VNI or >      >     not, >
> >      >     IMHO we >      >      >      >>>>
>    should allow it, >     more >      >      >     explanation as >      =
>
>     >      >>>>                                 >>> follows. >      >
> >      >>>>                                 >>> >      >      >      >>>>
>                                >>> Below is a >     figure >      >
>  derived from >      >      >      >>>>
>  figure 2 of >     RFC8014 (An >      >      >     Architecture for >
> >      >      >>>>                                 >>> Data-Center >
>  Network >      >      >      >>>>  Virtualization >     over Layer 3 >
>   >      >     (NVO3)). >      >      >      >>>>
>        >>> >      >      >      >>>>                                 >>> =
>
>             | >      >      >      >>>>
>   Data Center Network >      >     (IP)        | >      >      >      >>>=
>
>                                >>> >              | >      >      >
> >>>> >      >             | >      >      >      >>>>
>            >>> >      >      >      >>>> >      >      >
>  +-----------------------------------------+ >      >      >      >>>>
>                            >>> >      >             | >      >      >
> >>>> >           | >      >      >      >>>>
>  >>> >      >             | >      >      >      >>>>
>             Tunnel Overlay >          | >      >      >      >>>>
>                        >>> >      >      >      >>>> >
>  +------------+---------+ >      >      >      >>>> >
>   +---------+------------+ >      >      >      >>>>
>          >>>         | >      >      >      >>>> >
>  +----------+-------+ | >      >           | >      >      >      >>>> >
>    +-------+----------+ | >      >      >      >>>>
>          >>> >     | | >      >     Overlay >      >      >      >>>>
>                            Module  | | >       | | >      >     Overlay >
>     >      >      >>>>                                 Module  | | >
> >      >      >>>>                                 >>>         | >      >
>     >      >>>> >       +---------+--------+ | >      >           | >
> >      >      >>>> >       +---------+--------+ | >      >      >
> >>>>                                 >>>         | >      >           | >
>     >      >      >>>>                                     |    | >
>      | >      >      >          | >      >      >      >>>>
>                  >>>  NVE1   | >      >           | >      >      >
> >>>>                                     |    | >             | >      >
>   >          | >      >      >      >>>>
>  NVE2 >      >      >      >>>>                                 >>>
> | >      >      >      >>>> >       +--------+-------+  | >      >
>  | >      >      >      >>>> >       +--------+-------+  | >      >      =
>
>     >>>>                                 >>> >     |  |VNI1 >      >
> >     VNI2  VNI1 >      >      >      >>>>
>  |  |  |  | VNI1 >      >     VNI2 VNI1 >      >      >     |  | >      >
>     >      >>>>                                 >>>         | >      >
> >      >>>> >       +-+-----+----+---+  | >      >           | >      >
>   >      >>>> >       +-+-----+-----+--+  | >      >      >      >>>>
>                            >>> >     |VAP1| >      >     VAP2|    | >
> >      >      >>>>                                 VAP3 | >       |VAP1|
> VAP2| >      >      >       | VAP3| >      >      >      >>>>
>                    >>> >      >      >      >>>> >
>  +----+-----+----+------+ >      >      >      >>>> >
>   +----+-----+-----+-----+ >      >      >      >>>>
>          >>> >      >       |     | >      >      >        | >      >
> >      >>>>        | >      >       |     | >      >      >      >>>>
>                            >>> >      >       |     | >      >      >
>   | >      >      >      >>>>        | >      >       |     | >      >
> >      >>>>                                 >>> >      >       |     | >
>   >      >        | >      >      >      >>>>        | >      >       |
>  | >      >      >      >>>>                                 >>> >      >
>     >      >>>> >      >      > >
>  -------+-----+----+-------------------+-----+-----+------- >      >
> >      >>>>                                 >>> >      >       |     | >
>   >      >        | >      >      >      >>>>  Tenant        | >      >
>    |     | >      >      >      >>>>                                 >>> =
>
>    TSI1 | >      >     TSI2|    | >      >      >      >>>>
>                  TSI3 >     TSI1| TSI2| >      >      >       |TSI3 >
> >      >      >>>>                                 >>> >      >     +---+
> +---+ >      >      >      >>>>                                 +---+ >
>    +---+ >      >     +---+ >      >      >       +---+ >      >      >
>   >>>>                                 >>> >      >     |TS1| |TS2| >
> >      >      >>>>                                 |TS3| >       |TS4| >
>   >     |TS5| >      >      >       |TS6| >      >      >      >>>>
>                          >>> >      >     +---+ +---+ >      >      >
> >>>>                                 +---+ >       +---+ >      >     +--=
-+
> >      >      >       +---+ >      >      >      >>>>
>            >>> >      >      >      >>>>
>  >>> To my >      >     understanding, the BFD >      >      >      >>>>
>                              sessions between >     NVE1 >      >     and
> NVE2 are >      >      >      >>>>                                 actual=
ly
> >      >      >      >>>>                                 >>> initiated a=
nd
> >      >     terminated >      >      >     at VAP >      >      >
> >>>>                                 of NVE. >      >      >      >>>>
>                            >>> >      >      >      >>>>
>              >>> If the >     network operator >      >      >     want t=
o
> >      >      >      >>>>                                 set up one BFD =
>
>    session >      >     between >      >      >     VAP1 of >      >
> >      >>>>                                 >>> NVE1 and VAP1of >      >
>  NVE2, at the >      >      >      >>>>
>  same time >     another BFD >      >     session >      >      >
> >>>>                                 between VAP3 of >      >      >
> >>>>                                 >>> NVE1 and >     VAP3 of NVE2, >
>   >      >     although >      >      >      >>>>
>        the two BFD sessions >      >     are for >      >      >     the
> same >      >      >      >>>>                                 >>> VNI1, =
I
> >     believe it's >      >      >     reasonable, >      >      >
> >>>>                                 so that's why I >     think we >
> >      >     should allow it >      >      >      >>>> >      >      >
> >>>> >      >      >       ______________________________________________=
_
> >      >      >      >>>>                                 nvo3 mailing li=
st
> >      >      >      >>>> nvo3@ietf.org  >  <
> mailto:nvo3@ietf.org >> >       > <
> mailto:nvo3@ietf.org  >>>
> >      >       >  <
> mailto:nvo3@ietf.org >> >       > <
> mailto:nvo3@ietf.org  >>>>
>   > >      <
> mailto:nvo3@ietf.org >> >      >       > <
> mailto:nvo3@ietf.org  >>>
> >      >      >      <
> mailto:nvo3@ietf.org >   >> >     <
> mailto:nvo3@ietf.org  >
>   >>>>> >      >      >      >>>>
> https://www.ietf.org/mailman/listinfo/nvo3
> 
> >      >      >      >>>> >      >      > >      > >
>
>

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From: Greg Mirsky 
Date: Wed, 30 Oct 2019 13:58:30 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Jeffrey Haas 
Cc: Dinesh Dutt , Anoop Ghanwani ,  "Joel M. Halpern" , Santosh P K , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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Hi Jeff,
thank you for your comments and suggestion. Please find my answers below
in-lined under the GIM>> tag.

Regards,
Greg

On Wed, Oct 30, 2019 at 1:27 PM Jeffrey Haas  wrote:

> Greg,
>
> From the updated text:
>
> "At the same time, a service layer BFD session may be used between the
> tenants of VTEPs IP1 and IP2 to provide end-to-end fault management. In
> such case, for VTEPs BFD Control packets of that session are
> indistinguishable from data packets.  If end-to-end defect detection is
> realized as the set of concatenated OAM domains, e.g., VM1-1 - IP1 --
> IP2 - VM2-1, then the BFD session over VXLAN between VTEPs SHOULD
> follow the procedures described in Section 6.8.17 [RFC5880]."
>
> In the case that two VMs are running BFD to each other as a user
> application
> rather than as part of the virtualized environment, it's unlikely that
> they'd be treated as concatenated domains.  To do so, the tenant VMs woul=
d
> have to have a sense that they are indeed virtual.
>
> Is your intent in this text that BFD implementations on the server should
> detect BFD sessions between servers and change them to a concatenated
> session?
>
GIM>> No, we do not suggest that the concatenation of BFD sessions be
automagical. That may be controlled via the management plane though.

>
> Section 5 comment:
>
> :   The UDP destination port and the TTL of the inner IP packet MUST be
> :   validated to determine if the received packet can be processed by
> :   BFD.  BFD Control packets with unknown MAC address MUST NOT be
> :   forwarded to VMs.
>
> I'd suggest pushing the second sentence into the prior section since it
> deals with MAC addresses rather than the UDP procedures.
>
GIM>> Could you please clarify your suggestion - move to Section 4 or to
the preceding paragraph? I think it is the latter but wanted to make sure.

>
> -- Jeff
>
>
> On Wed, Oct 30, 2019 at 01:06:23PM -0700, Greg Mirsky wrote:
> > Dear All,
> > thank you for your comments, suggestions that have made the discussion
> the
> > most helpful to the Editors. I've tried to reflect your comments in the
> > updates listed below:
> >
> >    - on the inner destination IP address:
> >
> > OLD TEXT:
> >          Destination IP: IP address MUST NOT be of one of tenant's IP
> >          addresses.  IP address MAY be selected from the range 127/8 fo=
r
> >          IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
> > NEW TEXT:
> >          Destination IP: IP address MUST NOT be of one of tenant's IP
> >          addresses.  The IP address SHOULD be selected from the range
> 127/8
> >          for IPv4, for IPv6 - from the range 0:0:0:0:0:FFFF:7F00:0/104.
> >          Alternatively, the destination IP address MAY be set to VTEP's
> >          IP address.
> >
> >    - firewall. Appended Section 3 Deployment with the following
> paragraph:
> >
> >    As per Section 4, the inner destination IP address SHOULD be set to
> >    one of the loopback addresses (127/8 range for IPv4 and
> >    0:0:0:0:0:FFFF:7F00:0/104 range for IPv6).  There could be a firewal=
l
> >    configured on VTEP to block loopback addresses if set as the
> >    destination IP in the inner IP header.  It is RECOMMENDED to allow
> >    addresses from the loopback range through a firewall only if it is
> >    used as the destination IP address in the inner IP header, and the
> >    destination UDP port is set to 3784 [RFC5881].
> >
> > Regarding the use of VNI 0 as the Management VNI. In Section 6 has been
> > noted:
> >    An implementation MAY support the use of the Management
> >    VNI as control and management channel between VTEPs.  The selection
> >    of the VNI number of the Management VNI MUST be controlled through
> >    management plane.  An implementation MAY use VNI number 1 as the
> >    default value for the Management VNI.
> >
> > Attached, please find the updated working version and the diff to -07.
> > Editors much appreciate your comments, suggestions, abd help to have th=
e
> > new version uploaded before the cut-off deadline.
> >
> > Regards,
> > Greg
> >
> > On Wed, Oct 30, 2019 at 4:46 AM Dinesh Dutt  wrote:
> >
> > >
> > >
> > > On Wed, Oct 30, 2019 at 11:40 AM, Anoop Ghanwani <
> anoop@alumni.duke.edu>
> > > wrote:
> > >
> > > Hi Dinesh,
> > >
> > > Your earlier comment was about silicon, that's why I discussed only t=
he
> > > trapping issue.  As far as software goes, IP stacks would typically
> discard
> > > packets received from a non-loopback interface if the packet's addres=
s
> is
> > > in 127/8.  I am not sure a traditional IP stack can play here because
> even
> > > on Tx, we have the same MAC for reaching all remote VTEPs.  It seems
> to me
> > > the BFD module would have to be working directly with L2 frames comin=
g
> off
> > > the tunnel.  Kind of like if we were running LLDP between the VTEPs.
> > >
> > >
> > > Hi Anoop,
> > >
> > > My earlier comment was indeed about silicon, but the packet has to go
> > > through the software stack as well once it gets to the CPU. Linux-bas=
ed
> > > solutions such as Linux servers or Cumulus Linux or maybe even SONIC
> will
> > > need to have a valid IP address to process the packet. Given that
> 127/8 is
> > > already mandated by MPLS BFD, sticking with that is better than
> ignoring
> > > the IP address. This is why I agreed with Jeffrey Haas' comment about
> > > SHOULD be set.
> > >
> > > Dinesh
> > >
> > >
> > > Thanks,
> > > Anoop
> > >
> > > On Tue, Oct 29, 2019 at 10:02 PM Dinesh Dutt  wrote=
:
> > >
> > >> Trapping to the CPU would be fine based on MAC DA. But once there, a
> > >> self-respecting network stack would look at the IP header to decide
> what to
> > >> do. Ignoring it on receive may not be an option,
> > >>
> > >> Dinesh
> > >> On Oct 30, 2019, 10:26 AM +0530, Anoop Ghanwani <
> anoop@alumni.duke.edu>,
> > >> wrote:
> > >>
> > >> Hi Dinesh,
> > >>
> > >> What would break?  If messages are trapped to CPU based on the MAC D=
A,
> > >> what is the problem?
> > >>
> > >> On the flip side, there are implementations running BFD today which
> use
> > >> different addresses as specified here:
> > >> http://www.openvswitch.org/support/dist-docs/vtep.5.html
> > >> >>>
> > >>
> > >>        *b**f**d**_**c**o**n**f**i**g**_**l**o**c**a**l* *:*
> *b**f**d**_**d**s**t**_**i**p*: optional string
> > >>               Set to an IPv4 address to set the IP address that is
> expected as
> > >>               destination   for   received   BFD   packets.   The
> default  is
> > >>               *1**6**9**.**2**5**4**.**1**.**0*.
> > >>
> > >> >>>
> > >>
> > >> Thanks,
> > >> Anoop
> > >>
> > >> On Tue, Oct 29, 2019 at 7:01 PM Dinesh Dutt  wrote=
:
> > >>
> > >>> I suspect silicon implementations will have a problem with saying
> that
> > >>> they can be set to anything and MUST be ignored on reception. Your
> logic is
> > >>> sound, it's just that I fear you'll break many existing
> implementations. I
> > >>> recommend sticking with the 127/8 address for this case.
> > >>>
> > >>> Dinesh
> > >>>
> > >>> On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern <
> jmh@joelhalpern.com>
> > >>> wrote:
> > >>>
> > >>> In all the discussion about what VNI to use and multiple VNI
> support, I
> > >>> lsot track. Sorry. Still, the earlier documents did not specify the
> IP to
> > >>> use. That does NOT mean that we are required in later revisions of
> the
> > >>> document to allow anything the client wants. Having said that, we
> could add
> > >>> text saying that since the IP address in the BFD request in VNI 0 i=
s
> > >>> effectively meaningless, it can be set to any value on transmission
> and
> > >>> must be ignored on reception. As far as I can tell, it is
> definitional that
> > >>> the VtEP does not have any assigned IP address for VNI 0, so we can=
't
> > >>> expect that address. Yours, Joel On 10/29/2019 11:10 AM, Anoop
> Ghanwani
> > >>> wrote:
> > >>>
> > >>> Hi Joel, Yes, existing implementations use VNI 0 for BFD over VXLAN=
.
> > >>> Here are a couple of references:
> > >>>
> https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-ovsd=
b-bfd-nsx.html
> > >>>
> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-ser=
ies-switches/white-paper-c11-740091.html#_Toc18013665
> > >>> I guess this document has been evolving and I have not kept up with
> it. The
> > >>> version I had reviewed and commented on originally allowed for VNI
> 0.  The
> > >>> -04 version of the draft has this:
> > >>> https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04#section-7 What
> > >>> version are you referring to? Thanks, Anoop On Mon, Oct 28, 2019 at
> 12:55
> > >>> PM Joel M. Halpern  > >>> >> wrote: You are saying that there are
> existing
> > >>> implementations using VNI 0 for this?  Given that previous versions
> of the
> > >>> spec explicitly disallowed VNI 0, I am having trouble with your
> objecting
> > >>> that a spec for how to run over VNI 0 breask existing
> implementations. Note
> > >>> that when there is a good technical reason, the IETF does change
> Internet
> > >>> Drafts in ways that break early implementations.  That is the price
> of
> > >>> standardization. Yours, Joel On 10/28/2019 2:30 PM, Anoop Ghanwani
> wrote: >
> > >>> Hi Joel, > > Writing the spec in that way would make the current,
> > >>> inter-operable > implementation of multiple vendors non-compliant
> with the
> > >>> spec. > > Thanks, > Anoop > > On Mon, Oct 28, 2019 at 11:07 AM Joel
> M.
> > >>> Halpern  > >>> > >  > >>>   jmh@joelhalpern.com>>>>
> > >>> wrote: > >     I assumed this was only for the case where a tenant
> VNI was
> > >>> being used. > >     For the 0 VNI (which is what I prefer), always
> (MUST)
> > >>> use the loopback >     address.  There are no addresses assigned to
> the
> > >>> VTEP in that space. >     There is no IRB in that space. > >
>  Yours, >
> > >>>    Joel > >     On 10/28/2019 1:58 PM, Anoop Ghanwani wrote: >
> > Joel,
> > >>> >      > >      > Are we going to qualify this by VNI?  There's a
> bunch of
> > >>> >     implementations >      > out there that don't use a tenant IP
> or a
> > >>> loopback with VNI 0--they >      > simply repeat the underlay IP in
> the
> > >>> inner IPDA. >      > >      > Thanks, >      > Anoop >      > >
> > On
> > >>> Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern >     <
> jmh@joelhalpern.com
> > >>> > <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >> >      > <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com > <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >>>> wrote: >
> > >
> > >>>     >     I can live with saying that you SHOULD use loopback, and
> MAY >
> > >>>  instead >      >     use >      >     an IP address in the custome=
r
> space
> > >>> known to be owned by the VTEP >      >     device >      >     when
> such
> > >>> exists. >      > >      >     Yours, >      >     Joel >      > >
>   >
> > >>>  On 10/28/2019 1:32 PM, Anoop Ghanwani wrote: >      >      > Hi
> Joel, >
> > >>>   >      > >      >      > Perhaps we need to say use of an address
> owned
> > >>> by the device >      >     containing >      >      > the VTEP. >
>   >
> > >>>   > >      >      > Or are you suggesting that the use of the
> loopback
> > >>> address >     space >      >     is a MUST? >      >      > >
> >      >
> > >>> Anoop >      >      > >      >      > On Mon, Oct 28, 2019 at 10:22
> AM Joel
> > >>> M. Halpern >      >      jmh@joelhalpern.com
> > >>> >  jmh@joelhalpern.com>
> > >>> >> >     <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com > <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >>> >      >      >
> <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com > <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >> >     <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com > <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >>>>> wrote: >
> >
> > >>>     > >      >      >     There is something I am missing in your
> > >>> assumption >     about IRB. >      >      > >      >      >     As =
I
> > >>> understand VxLAN, the VTEP is under the control >     of the >     =
 >
> > >>>  operator. >      >      >     As such, it is a pure bridge.  If yo=
u
> run
> > >>> IRB behind >     it, that >      >     is fine. >      >      >
>  Yes, an
> > >>> operator may offer IRB.  But as I understand it, >      >
>  conceptually,
> > >>> >      >      >     in terms of the VxLAN architecture the IRB is a=
n
> entity
> > >>> >      >     behind the >      >      >     VTEP, >      >      >
>  not
> > >>> part of the VTEP. >      >      > >      >      >     Yours, >     =
 >
> > >>> >     Joel >      >      > >      >      >     On 10/28/2019 12:23
> PM,
> > >>> Anoop Ghanwani wrote: >      >      >      > Santosh, >      >     =
 >
> > >>> > >      >      >      > Does it have to be a MUST?  What if I am
> running
> > >>> >     IRB and there >      >      >     are IP >      >      >     =
 >
> > >>> addresses per VNI assigned to the VTEPs? Why can the >      >
>  operator
> > >>> not >      >      >      > choose to use those? >      >      >
> > >
> > >>>   >      >      > Anoop >      >      >      > >      >      >
> > On
> > >>> Mon, Oct 28, 2019 at 7:51 AM Santosh P K >      >      >      > <
> > >>> santosh.pallagatti@gmail.com  > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com >=
>
> >
> > >>>     >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com  >>>>
> > >>> >      >      >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com >=
>
> >
> > >>>     >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com  >>>>>
> > >>> >      >      >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com >=
>
> >
> > >>>     >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com  >>>>
> > >>> >      >      >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com >=
>
> >
> > >>>     >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com  >>>>>>>
> > >>> wrote: >      >      >      > >      >      >      >     Dinesh,
> Anoop et
> > >>> all, >      >      >      >           Lets us know if this text
> works for
> > >>> 127/8 >      >     address range? >      >      >      > >      >
>   >
> > >>>   >     [proposed text for firewall] >      >      >      > >      =
>
> > >>> >      >     "As per section 4 inner destination IP address >
>  MUST be
> > >>> >      >     set to >      >      >     127/8 >      >      >      =
>
> > >>>  address. There may be firewall configured on >     VTEP to >      =
>
> > >>>  block 127/8 >      >      >      >     address range if set as
> destination
> > >>> IP in inner IP >      >     header. It is >      >      >      >
> > >>>  recommended to allow 127/8 range address through >      >
>  firewall
> > >>> only if >      >      >      >     127/8 IP address is set as
> destination
> > >>> address >     in inner IP >      >      >     header." >      >
> >
> > >>> > >      >      >      > >      >      >      >     In section 4 we
> are
> > >>> talking about using 127/8 >     and not >      >     really >      =
>
> > >>> >     giving >      >      >      >     reason why. I think we
> should have
> > >>> text as RFC 5884 >      >     has mentioned >      >      >      >
>    with
> > >>> below text. >      >      >      > >      >      >      >     [From
> RFC
> > >>> 5884] >      >      >      >     "The motivation for using the
> address
> > >>> range >     127/8 is >      >     the same as >      >      >      =
>
> > >>>  specified in Section 2.1 of [RFC4379] >      >      >      >  <
> > >>> https://tools.ietf.org/html/rfc4379#section-2.1>. >      >     This
> is
> > >>> an >      >      >      >     exception to the behavior defined in
> [RFC1122
> > >>> >      >      >      >     ]."
> >
> > >>>     >      >      > >      >      >      > >      >      >      > >
>     >
> > >>>     >      >     Thanks >      >      >      >     Santosh P K >
>   >
> > >>>   >      > >      >      >      > >      >      >      > >      >
>   >
> > >>>   >     On Thu, Oct 24, 2019 at 1:24 AM Dinesh Dutt >      >     <
> > >>> didutt@gmail.com > <
> > >>> mailto:didutt@gmail.com   > >>> >> >      didutt@gmail.com> <
> > >>> mailto:didutt@gmail.com >  > >>>  >>> >
> > >>>   >      >      <
> > >>> mailto:didutt@gmail.com >  > >>>  >> >
>    <
> > >>> mailto:didutt@gmail.com   > >>> >  <
> > >>> mailto:didutt@gmail.com >>>> >      >      >
> >
> > >>>      didutt@gmail.com
> > >>> > >     
> <
> > >>> mailto:didutt@gmail.com >>  didutt@gmail.com
> > >>>  > >
>    <
> > >>> mailto:didutt@gmail.com   > >>> >>> >      >      > >>>  > <
> > >>> mailto:didutt@gmail.com   > >>> >> >      didutt@gmail.com> <
> > >>> mailto:didutt@gmail.com >  > >>>  >>>>>=
>
> > >>> wrote: >      >      >      > >      >      >      >         Looks
> good to
> > >>> me Greg. I see that the text >     around >      >     the use >
>   >
> > >>>   >     of the >      >      >      >         inner IP address as
> also
> > >>> quite acceptable. Will >      >     you add any >      >      >
> >
> > >>>    words about the firewall? >      >      >      > >      >      >
>     >
> > >>>        Dinesh >      >      >      > >      >      >      >
>  On Wed,
> > >>> Oct 23, 2019 at 8:36 PM, Greg Mirsky >      >      >      >        =
 <
> > >>> gregimirsky@gmail.com  > >>> > >      > >>>   > >>> >> >      >      > >>>   > >>> >  > >>>   > >>> >>> >      > >>>   > >>> >  > >>>   > >>> >> >      >      > >>>   > >>> >  > >>>   > >>> >>>> >      >      >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >> <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >>> >      >
>  <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >> >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >>>>>> wrote: >
> > >>>   >      >      >>         Hi Dinesh, et al., >      >      >      =
>>
> > >>>    please check the updated version that >     removed the >      >
>     >
> > >>>    reference to >      >      >      >>         Hypervisor in the
> text and
> > >>> Figure 1. >      >      >      >> >      >      >      >>
>  Regards,
> > >>> >      >      >      >>         Greg >      >      >      >> >     =
 >
> > >>> >      >>         On Wed, Oct 23, 2019 at 10:47 AM Santosh P K >
>   >
> > >>>   >      >>          > >>> mailto:santosh.pallagatti@gmail.com >
> >
> > >>>     santosh.pallagatti@gmail.com> <
> > >>> mailto:santosh.pallagatti@gmail.com >=
>
> >
> > >>>     >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com  >>>>
> > >>> >      >      >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com >=
>
> >
> > >>>     >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com  >>>>>
> > >>> >      >      >      >>   > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com >=
>
> >
> > >>>     >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com  >>>>
> > >>> >      >      >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com >=
>
> >
> > >>>     >      > >>>   > >>> > >     <
> > >>> mailto:santosh.pallagatti@gmail.com  =
<
> > >>> mailto:santosh.pallagatti@gmail.com  >>>>>>>
> > >>> wrote: >      >      >      >> >      >      >      >>
>  Dinesh,
> > >>> >      >      >      >>                  Please see my inline
> comments
> > >>> [SPK] >      >      >      >> >      >      >      >> >      >     =
 >
> > >>> >>                 - In section 3, there's a sentence >     that >
>     >
> > >>>    is: "BFD >      >      >      >>                 packets intende=
d
> for a
> > >>> Hypervisor >     VTEP MUST >      >      >     NOT..". I >      >
>   >
> > >>>   >>                 recommend getting rid of the word >      >
> > >>>  "Hypervisor" ashe >      >      >      >>                 logic
> applies to
> > >>> any VTEP. >      >      >      >> >      >      >      >>
>  [SPK]
> > >>> Thanks for comments. We will >     change this. >      >      >
> >> >
> > >>>     >      >      >>                 - You already explained the >
> > >>>  precedence of >      >     the use of >      >      >      >>
> > >>>    127/8 address in the inner header in >      >     MPLS. I have n=
o
> >
> > >>> >      >      >>                 specific comments in that area. I
> have >
> > >>>     >     only two >      >      >      >>
>  questions: >
> > >>>   >      >      >>                    - Has anybody verified that
> the >
> > >>>  use of >      >     127/8 >      >      >      >>
>  address
> > >>> (and the right MAC) works with >      >     existing >      >      =
>
> > >>> >>                 implementations, including the silicon >      >
> > >>>  ones? If this >      >      >      >>                 doesn't work
> there,
> > >>> is it worth >     adding the >      >      >     possibilit >      =
>
> > >>> >      >>                 y of another address, one that is >
>  owned >
> > >>>     >     by the >      >      >     VTEP node? >      >      >
> >> >
> > >>>     >      >      >>                    - Do we know if Firewalls
> stop >
> > >>>  such VXLAN >      >      >     packets? >      >      >      >>
> > >>>      I ask this because VXLAN has an IP >     header >      >
>  and I >
> > >>>     >      >     don't >      >      >      >>                 know
> if
> > >>> firewalls stop packets >     with 127/8 >      >     in the >      =
>
> > >>> >     inner >      >      >      >>                 header. If not,
> is it
> > >>> worth adding a >      >     sentence to say >      >      >      >>
> > >>>          that firewalls  allow such >     packets? The >      >
>  use of
> > >>> a >      >      >      >>                 non-127/8 address may
> alleviate
> > >>> >     this case >      >     as well. >      >      >      >> >
> >
> > >>> >      >>             [SPK] I think we may need to add the text >
>   >
> > >>>  about firewall >      >      >      >>             as some checks =
in
> > >>> firewall will be >     there if >      >     they are not >      >
>     >
> > >>>     >>             already using MPLS OAM which has inner IP >     =
 >
> > >>>  header with >      >      >      >>             127/8 address
> range. >
> > >>>   >      >      >> >      >      >      >> >      >      >      >>
> > >>>        The rest of the draft looks good >     to me, >      >      =
>
> > >>> >> >      >      >      >>                 Dinesh >      >      >
>   >>
> > >>> >      >      >      >>                 On Wed, Oct 23, 2019 at 7:5=
8
> AM, >
> > >>>    Greg Mirsky >      >      >      >>                 <
> > >>> gregimirsky@gmail.com  > >>> > >      > >>>   > >>> >> >      >      > >>>   > >>> >  > >>>   > >>> >>> >      >      >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >> <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >>>> >      >
>    <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >> >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >>> >      >
> > >>> >      <
> > >>> mailto:gregimirsky@gmail.com > >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >> <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >>>>>> >      >
> > >>>   >      >>                 wrote: >      >      >      >>>
> > >>>  Hi Dinesh, >      >      >      >>>                 I greatly
> appreciate
> > >>> your comments. >      >     Please heave a >      >      >      >>>
> > >>>          look at the attached copy of the >     working >      >
>   >
> > >>>  version and >      >      >      >>>                 its diff to -=
07
> > >>> (latest in the >     datatracker). >      >      >      >>> >      =
>
> > >>> >      >>>                 Regards, >      >      >      >>>
> > >>>  Greg >      >      >      >>> >      >      >      >>>
>    On
> > >>> Tue, Oct 22, 2019 at 9:52 PM >     Dinesh Dutt >      >      >
> >>>
> > >>>               > >>> > >     
> <
> > >>> mailto:didutt@gmail.com >> >      >     <
> > >>> mailto:didutt@gmail.com   > >>> >  <
> > >>> mailto:didutt@gmail.com >>> >     <
> > >>> mailto:didutt@gmail.com   > >>> >  <
> > >>> mailto:didutt@gmail.com >> >      >     <
> > >>> mailto:didutt@gmail.com   > >>> >  <
> > >>> mailto:didutt@gmail.com >>>> >      >      >     =
<
> > >>> mailto:didutt@gmail.com   > >>> >  <
> > >>> mailto:didutt@gmail.com >> >     <
> > >>> mailto:didutt@gmail.com   > >>> >  <
> > >>> mailto:didutt@gmail.com >>> >      >     <
> > >>> mailto:didutt@gmail.com   > >>> >  <
> > >>> mailto:didutt@gmail.com >> >     <
> > >>> mailto:didutt@gmail.com   > >>> >  <
> > >>> mailto:didutt@gmail.com >>>>>> wrote: >      >
> > >>> >      >>> >      >      >      >>>                     I have the
> same
> > >>> feeling as Anoop. >      >     Greg, can you >      >      >      >=
>>
> > >>>                please point me to the latest >     draft >      >
>  so
> > >>> that >      >      >     I can >      >      >      >>>
> > >>>  quickly glance through it to be >      >     doubly sure, >      >
>     >
> > >>>     >>> >      >      >      >>>                     Dinesh >      =
>
> > >>> >      >>> >      >      >      >>>                     On Wed, Oct
> 23,
> > >>> 2019 at 4:35 AM, >      >     Anoop Ghanwani >      >      >      >=
>>
> > >>>                 > >>> > >      > >>>   > >>> >> >      >      > >>>   > >>> >  > >>>   > >>> >>> >      >      >     <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu > >     <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >> <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu > >     <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >>>> >      >
> > >>> >      >>>   <
> > >>> mailto:anoop@alumni.duke.edu > >     <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >> >      >
>  <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu > <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >>> >      >
> > >>> >      <
> > >>> mailto:anoop@alumni.duke.edu > >     <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >> >      >
>  <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu > >     <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
> > >>>   >      >      >>>>                     Greg, >      >      >
> >>>> >
> > >>>     >      >      >>>>                     I think the draft is fin=
e
> as is.
> > >>> >      >      >      >>>> >      >      >      >>>>
>    I
> > >>> discussion with Xiao Min was >      >     about #3 and I >      >
>   >
> > >>>   >>>>                     see that as unnecessary until we >      =
>
> > >>>  have a draft >      >      >      >>>>                     that
> explains
> > >>> why that is >     needed in the >      >      >     context >      =
>
> > >>> >      >>>>                     of the NVO3 architecture. >      >
>     >
> > >>>     >>>> >      >      >      >>>>                     Anoop >     =
 >
> > >>> >      >>>> >      >      >      >>>>                     On Tue,
> Oct 22,
> > >>> 2019 at 11:17 AM >      >     Greg Mirsky >      >      >      >>>>
> <
> > >>> gregimirsky@gmail.com  > >>> > >      > >>>   > >>> >> >      >      > >>>   > >>> >  > >>>   > >>> >>> >      >      >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >> <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >>>> >      >
> > >>> >      >>>> >        > >>>   > >>> >  > >>>   > >>> >> >      >      > >>>   > >>> >  > >>>   > >>> >>> >      >      >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >> >      >
>  <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com > >     <
> > >>> mailto:gregimirsky@gmail.com  <
> > >>> mailto:gregimirsky@gmail.com >>>>>> wrote: >
> > >>>   >      >      >>>> >      >      >      >>>>
>    Hi
> > >>> Anoop, et al., >      >      >      >>>>                         I
> agree
> > >>> with your >     understanding >      >     of what is >      >     =
 >
> > >>> >>>>                         being defined in the current >      >
> > >>>  version >      >      >     of the >      >      >      >>>>
> > >>>            BFD over VxLAN >     specification. >      >     But, as
> I >
> > >>>   >      >      >>>>                         understand, the WG is =
>
> > >>> >     discussing the scope >      >      >      >>>>
> > >>>  before the WGLC is closed. I >      >     believe there >      >
>   >
> > >>>   >>>>                         are three options: >      >      >
>   >>>>
> > >>> >      >      >      >>>>                          1. single BFD
> session >
> > >>>    between >      >     two VTEPs >      >      >      >>>>
> > >>>           2. single BFD session >     per VNI >      >     between =
>
> > >>> >      >     two VTEPs >      >      >      >>>>
> > >>> 3. multiple BFD >     sessions per >      >     VNI between >      =
>
> > >>> >      >>>>                             two VTEPs >      >      >
>   >>>>
> > >>> >      >      >      >>>>                         The current text =
>
> > >>>  reflects #2. Is WG >      >      >     accepts >      >      >
> >>>>
> > >>>                        this scope? If not, which >      >     optio=
n
> WG
> > >>> would >      >      >      >>>>                         accept? >
>   >
> > >>>   >      >>>> >      >      >      >>>>
>  Regards, >
> > >>>     >      >      >>>>                         Greg >      >      >
> > >>> >>>> >      >      >      >>>>                         On Tue, Oct
> 22, 2019
> > >>> at >     2:09 PM >      >     Anoop >      >      >      >>>>
> > >>>            Ghanwani >      > >>> mailto:anoop@alumni.duke.edu > <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >> >      >
>  <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu > <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >>> >      >
> > >>> >      <
> > >>> mailto:anoop@alumni.duke.edu > >     <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >> <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu > >     <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >>>> >      >
> > >>> >      >>>> >        > >>>   > >>> >  > >>>   > >>> >> >      >      > >>>   > >>> >  > >>>   > >>> >>> >      >      >     <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu > >     <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >> >      >
>  <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu > >     <
> > >>> mailto:anoop@alumni.duke.edu  <
> > >>> mailto:anoop@alumni.duke.edu >>>>>> wrote: >
> > >>>   >      >      >>>> >      >      >      >>>>
> > >>>  I concur with Joel's >     assessment >      >      >     with the=
 >
> > >>> >      >      >>>>                             following >
> > >>>  clarifications. >      >      >      >>>> >      >      >      >>>=
>
> > >>>                      The current document >     is already >      >
>     >
> > >>>    capable >      >      >      >>>>                             of
> > >>> monitoring >     multiple VNIs >      >      >     between VTEPs. >
>     >
> > >>>     >      >>>> >      >      >      >>>>
>  The
> > >>> issue under >     discussion >      >     was how >      >      >
>  do we
> > >>> >      >      >      >>>>                             use BFD to
> monitor >
> > >>>    multiple >      >     VAPs that >      >      >      >>>>
> > >>>              use the same VNI >     between a >      >     pair of =
>
> > >>> >      >      >>>>                             VTEPs.  The use case
> for >
> > >>>     >     this is not >      >      >      >>>>
> > >>>  clear to me, as from my >      >     understanding, >      >      =
>
> > >>> >>>>                             we cannot have a >     situation
> with >
> > >>>   >      >     multiple >      >      >      >>>>
> > >>>    VAPs using the same >      >     VNI--there is 1:1 >      >     =
 >
> > >>> >>>>                             mapping between VAP >     and VNI.=
 >
> > >>> >      >      >>>> >      >      >      >>>>
> > >>>  Anoop >      >      >      >>>> >      >      >      >>>>
> > >>>            On Tue, Oct 22, 2019 >     at 6:06 AM >      >      >
>  Joel
> > >>> M. >      >      >      >>>>                             Halpern >
>     >
> > >>>     > >>> >  jmh@joelhalpern.com>
> > >>> >> >     <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com > <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >>> >      >      >
> > >>>   <
> > >>> mailto:jmh@joelhalpern.com > >     <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >> <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com > >     <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >>>> >      >      =
>
> > >>>   >>>> >        <
> > >>> mailto:jmh@joelhalpern.com > <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >> >      >     <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com > <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >>> >      >      >
> > >>>   <
> > >>> mailto:jmh@joelhalpern.com > >     <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >> <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com > >     <
> > >>> mailto:jmh@joelhalpern.com  <
> > >>> mailto:jmh@joelhalpern.com >>>>>> >      >
> > >>>  wrote: >      >      >      >>>> >      >      >      >>>>
> > >>>                   From what I can >     tell, >      >     there >
>     >
> > >>>     >     are two >      >      >      >>>>
> > >>>  separate problems. >      >      >      >>>>
> > >>>    The document we >     have is a >      >      >     VTEP-VTEP >
>     >
> > >>>     >      >>>>                                 monitoring >
>  document.
> > >>> >      >     There is no >      >      >      >>>>
> > >>>        need for that >     document to >      >      >     handle
> the >
> > >>>   >      >      >>>>                                 multiple VNI
> case. >
> > >>>     >      >      >>>>                                 If folks wan=
t
> a >
> > >>>   >     protocol for doing >      >      >      >>>>
> > >>>          BFD monitoring >     of things >      >      >     behind
> the >
> > >>>   >      >      >>>>                                 VTEPs (multipl=
e
> >
> > >>>  VNIs), >      >     then do >      >      >     that >      >     =
 >
> > >>> >>>>                                 as a separate >      >
>  document.
> > >>>  The >      >      >      >>>>
>  encoding
> > >>> will be >     a tenant >      >      >     encoding, >      >      =
>
> > >>> >>>>                                 and thus >     sesparate from =
>
> > >>> >     what is >      >      >      >>>>
> > >>>  defined in this >     document. >      >      >      >>>> >      >
>     >
> > >>>     >>>>                                 Yours, >      >      >
> >>>>
> > >>>                                Joel >      >      >      >>>> >
> >
> > >>> >      >>>>                                 On 10/21/2019 >     5:0=
7
> PM, >
> > >>>     >     Jeffrey >      >      >     Haas >      >      >      >>>=
>
> > >>>                          wrote: >      >      >      >>>>
> > >>>                > Santosh and >     others, >      >      >      >>>=
>
> > >>>                          > >      >      >      >>>>
> > >>>          > On Thu, Oct >     03, 2019 at >      >      >
>  07:50:20PM >
> > >>>     >      >      >>>>                                 +0530,
> Santosh P >
> > >>>    K wrote: >      >      >      >>>>
>  >>
> > >>>  Thanks >     for your >      >      >     explanation. >      >
>   >
> > >>>   >>>>                                 This helps a lot. I >      >
> > >>>  would wait >      >      >     for more >      >      >      >>>>
> > >>>                        >> comments from >     others >      >     t=
o
> see if
> > >>> >      >      >      >>>>                                 this what
> we >
> > >>>  need in this >      >      >     draft to be >      >      >
> >>>>
> > >>>                              >> supported >     based on >      >
>  that
> > >>> we can >      >      >      >>>>
>  provide
> > >>> appropriate >      >     sections >      >      >     in the >     =
 >
> > >>> >      >>>>                                 draft. >      >      >
> > >>> >>>>                                 > >      >      >      >>>>
> > >>>                      > The threads on the >      >     list have >
>     >
> > >>>     >      >>>>                                 spidered to the >
>  point
> > >>> >      >     where it is >      >      >      >>>>
> > >>>        challenging >      >      >      >>>>
> > >>>  > to follow what the >      >     current >      >      >
>  status >
> > >>>   >      >      >>>>                                 of the draft
> is, >
> > >>>  or should >      >      >     be.  :-) >      >      >      >>>>
> > >>>                        > >      >      >      >>>>
> > >>>        > However, if I've >      >     followed things >      >
> >
> > >>> >>>>                                 properly, the >     question >
>     >
> > >>>    below is >      >      >      >>>>
> > >>>  really the >      >      >      >>>>
>  >
> > >>> hinge point on >     what our >      >      >      >>>>
> > >>>              encapsulation >     for BFD >      >     over vxlan >
>     >
> > >>>     >      >>>>                                 should look like. >
>     >
> > >>>     >      >>>>                                 > Correct? >      >
>     >
> > >>>     >>>>                                 > >      >      >      >>>=
>
> > >>>                          > Essentially, >     do we or >      >
>  do we
> > >>> not >      >      >      >>>>
>  require the
> > >>> >     ability to >      >     permit >      >      >      >>>>
> > >>>                    multiple BFD >      >      >      >>>>
> > >>>                > sessions between >      >     distinct VAPs? >
> >
> > >>> >      >>>>                                 > >      >      >
> >>>>
> > >>>                              > If this is so, >     do we >      >
>    have
> > >>> a >      >      >     sense >      >      >      >>>>
> > >>>            as to how we should >      >     proceed? >      >      =
>
> > >>> >>>>                                 > >      >      >      >>>>
> > >>>                      > -- Jeff >      >      >      >>>>
> > >>>              > >      >      >      >>>>
>      >
> > >>> [context preserved >      >     below...] >      >      >      >>>>
> > >>>                          > >      >      >      >>>>
> > >>>          >> Santosh P K >      >      >      >>>>
> > >>>        >> >      >      >      >>>>
>  >> On
> > >>> Wed, Sep >     25, 2019 >      >     at 8:10 AM >      >      >
> >>>>
> > >>> >        > >>> >  > >>>   > >>> >> >      >      > >>>   > >>> >  > >>>   > >>> >>> >      >      >     <
> > >>> mailto:xiao.min2@zte.com.cn  <
> > >>> mailto:xiao.min2@zte.com.cn > >     <
> > >>> mailto:xiao.min2@zte.com.cn  <
> > >>> mailto:xiao.min2@zte.com.cn >> <
> > >>> mailto:xiao.min2@zte.com.cn  <
> > >>> mailto:xiao.min2@zte.com.cn > >     <
> > >>> mailto:xiao.min2@zte.com.cn  <
> > >>> mailto:xiao.min2@zte.com.cn >>>> >      >
>   >
> > >>>     >>>> >      >        > >>>   > >>> >  > >>>   > >>> >> >      > >>>   > >>> >  > >>>   > >>> >>> >      >      >     <
> > >>> mailto:xiao.min2@zte.com.cn  <
> > >>> mailto:xiao.min2@zte.com.cn > >     <
> > >>> mailto:xiao.min2@zte.com.cn  <
> > >>> mailto:xiao.min2@zte.com.cn >> <
> > >>> mailto:xiao.min2@zte.com.cn  <
> > >>> mailto:xiao.min2@zte.com.cn > >     <
> > >>> mailto:xiao.min2@zte.com.cn  <
> > >>> mailto:xiao.min2@zte.com.cn >>>>>> >      >
> > >>>  wrote: >      >      >      >>>>                                 >=
>
> >
> > >>> >      >      >>>>                                 >>> Hi Santosh, =
>
> > >>> >      >      >>>>                                 >>> >      >
> >
> > >>> >>>>                                 >>> >      >      >      >>>>
> > >>>                        >>> With regard >     to the >      >
>  question
> > >>> >      >      >      >>>>                                 whether w=
e
> >
> > >>>  should allow >      >      >     multiple BFD >      >      >
> >>>>
> > >>>                              sessions >      >      >      >>>>
> > >>>                      >>> for the same >     VNI or >      >     not=
,
> >
> > >>> >      >     IMHO we >      >      >      >>>>
> > >>>    should allow it, >     more >      >      >     explanation as >
>     >
> > >>>     >      >>>>                                 >>> follows. >     =
 >
> > >>> >      >>>>                                 >>> >      >      >
> >>>>
> > >>>                                >>> Below is a >     figure >      >
> > >>>  derived from >      >      >      >>>>
> > >>>  figure 2 of >     RFC8014 (An >      >      >     Architecture for=
 >
> > >>> >      >      >>>>                                 >>> Data-Center =
>
> > >>>  Network >      >      >      >>>>  Virtualization >     over Layer
> 3 >
> > >>>   >      >     (NVO3)). >      >      >      >>>>
> > >>>        >>> >      >      >      >>>>
>  >>> >
> > >>>             | >      >      >      >>>>
> > >>>   Data Center Network >      >     (IP)        | >      >      >
>   >>>>
> > >>>                                >>> >              | >      >      >
> > >>> >>>> >      >             | >      >      >      >>>>
> > >>>            >>> >      >      >      >>>> >      >      >
> > >>>  +-----------------------------------------+ >      >      >
> >>>>
> > >>>                            >>> >      >             | >      >     =
 >
> > >>> >>>> >           | >      >      >      >>>>
> > >>>  >>> >      >             | >      >      >      >>>>
> > >>>             Tunnel Overlay >          | >      >      >      >>>>
> > >>>                        >>> >      >      >      >>>> >
> > >>>  +------------+---------+ >      >      >      >>>> >
> > >>>   +---------+------------+ >      >      >      >>>>
> > >>>          >>>         | >      >      >      >>>> >
> > >>>  +----------+-------+ | >      >           | >      >      >
> >>>> >
> > >>>    +-------+----------+ | >      >      >      >>>>
> > >>>          >>> >     | | >      >     Overlay >      >      >      >>=
>>
> > >>>                            Module  | | >       | | >      >
>  Overlay >
> > >>>     >      >      >>>>                                 Module  | | =
>
> > >>> >      >      >>>>                                 >>>         | >
>     >
> > >>>     >      >>>> >       +---------+--------+ | >      >           |=
 >
> > >>> >      >      >>>> >       +---------+--------+ | >      >      >
> > >>> >>>>                                 >>>         | >      >
>  | >
> > >>>     >      >      >>>>                                     |    | >
> > >>>      | >      >      >          | >      >      >      >>>>
> > >>>                  >>>  NVE1   | >      >           | >      >      >
> > >>> >>>>                                     |    | >             | >
>   >
> > >>>   >          | >      >      >      >>>>
> > >>>  NVE2 >      >      >      >>>>                                 >>>
> > >>> | >      >      >      >>>> >       +--------+-------+  | >      >
> > >>>  | >      >      >      >>>> >       +--------+-------+  | >      >
>     >
> > >>>     >>>>                                 >>> >     |  |VNI1 >      =
>
> > >>> >     VNI2  VNI1 >      >      >      >>>>
> > >>>  |  |  |  | VNI1 >      >     VNI2 VNI1 >      >      >     |  | >
>     >
> > >>>     >      >>>>                                 >>>         | >
> >
> > >>> >      >>>> >       +-+-----+----+---+  | >      >           | >
>   >
> > >>>   >      >>>> >       +-+-----+-----+--+  | >      >      >      >>=
>>
> > >>>                            >>> >     |VAP1| >      >     VAP2|    |=
 >
> > >>> >      >      >>>>                                 VAP3 | >
>  |VAP1|
> > >>> VAP2| >      >      >       | VAP3| >      >      >      >>>>
> > >>>                    >>> >      >      >      >>>> >
> > >>>  +----+-----+----+------+ >      >      >      >>>> >
> > >>>   +----+-----+-----+-----+ >      >      >      >>>>
> > >>>          >>> >      >       |     | >      >      >        | >     =
 >
> > >>> >      >>>>        | >      >       |     | >      >      >      >>=
>>
> > >>>                            >>> >      >       |     | >      >     =
 >
> > >>>   | >      >      >      >>>>        | >      >       |     | >
> >
> > >>> >      >>>>                                 >>> >      >       |
>  | >
> > >>>   >      >        | >      >      >      >>>>        | >      >
>  |
> > >>>  | >      >      >      >>>>                                 >>> >
>     >
> > >>>     >      >>>> >      >      > >
> > >>>  -------+-----+----+-------------------+-----+-----+------- >      =
>
> > >>> >      >>>>                                 >>> >      >       |
>  | >
> > >>>   >      >        | >      >      >      >>>>  Tenant        | >
>   >
> > >>>    |     | >      >      >      >>>>
>  >>> >
> > >>>    TSI1 | >      >     TSI2|    | >      >      >      >>>>
> > >>>                  TSI3 >     TSI1| TSI2| >      >      >       |TSI3=
 >
> > >>> >      >      >>>>                                 >>> >      >
>  +---+
> > >>> +---+ >      >      >      >>>>
>  +---+ >
> > >>>    +---+ >      >     +---+ >      >      >       +---+ >      >
>   >
> > >>>   >>>>                                 >>> >      >     |TS1| |TS2|=
 >
> > >>> >      >      >>>>                                 |TS3| >
>  |TS4| >
> > >>>   >     |TS5| >      >      >       |TS6| >      >      >      >>>>
> > >>>                          >>> >      >     +---+ +---+ >      >     =
 >
> > >>> >>>>                                 +---+ >       +---+ >      >
>  +---+
> > >>> >      >      >       +---+ >      >      >      >>>>
> > >>>            >>> >      >      >      >>>>
> > >>>  >>> To my >      >     understanding, the BFD >      >      >
> >>>>
> > >>>                              sessions between >     NVE1 >      >
>  and
> > >>> NVE2 are >      >      >      >>>>
>  actually
> > >>> >      >      >      >>>>                                 >>>
> initiated and
> > >>> >      >     terminated >      >      >     at VAP >      >      >
> > >>> >>>>                                 of NVE. >      >      >
> >>>>
> > >>>                            >>> >      >      >      >>>>
> > >>>              >>> If the >     network operator >      >      >
>  want to
> > >>> >      >      >      >>>>                                 set up on=
e
> BFD >
> > >>>    session >      >     between >      >      >     VAP1 of >      =
>
> > >>> >      >>>>                                 >>> NVE1 and VAP1of >
>   >
> > >>>  NVE2, at the >      >      >      >>>>
> > >>>  same time >     another BFD >      >     session >      >      >
> > >>> >>>>                                 between VAP3 of >      >      =
>
> > >>> >>>>                                 >>> NVE1 and >     VAP3 of
> NVE2, >
> > >>>   >      >     although >      >      >      >>>>
> > >>>        the two BFD sessions >      >     are for >      >      >
>  the
> > >>> same >      >      >      >>>>                                 >>>
> VNI1, I
> > >>> >     believe it's >      >      >     reasonable, >      >      >
> > >>> >>>>                                 so that's why I >     think we=
 >
> > >>> >      >     should allow it >      >      >      >>>> >      >
> >
> > >>> >>>> >      >      >
>  _______________________________________________
> > >>> >      >      >      >>>>                                 nvo3
> mailing list
> > >>> >      >      >      >>>> nvo3@ietf.org  > >>> >  <
> > >>> mailto:nvo3@ietf.org >> >      > >>>  > <
> > >>> mailto:nvo3@ietf.org   > >>> >>> >      >     
> <
> > >>> mailto:nvo3@ietf.org >  > >>>  >> >     <
> > >>> mailto:nvo3@ietf.org   > >>> >  <
> > >>> mailto:nvo3@ietf.org >>>>  > >>>  > >     <
> > >>> mailto:nvo3@ietf.org   > >>> >> >      >     
> <
> > >>> mailto:nvo3@ietf.org >  > >>>  >>> >      >
> > >>> >       > >>> >  <
> > >>> mailto:nvo3@ietf.org >> >      > >>>  > <
> > >>> mailto:nvo3@ietf.org   > >>> >>>>> >      >      >      >>>>
> > >>> https://www.ietf.org/mailman/listinfo/nvo3 >      >      >
> >>>> >
> > >>>     >      > >      > >
> > >>>
> > >>>
>
> >
> >
> >
> >
> > BFD                                                   S. Pallagatti, Ed=
.
> > Internet-Draft                                                    VMwar=
e
> > Intended status: Standards Track                             S. Paragir=
i
> > Expires: May 2, 2020                              Individual Contributo=
r
> >                                                              V. Govinda=
n
> >                                                             M. Mudigond=
a
> >                                                                    Cisc=
o
> >                                                                G. Mirsk=
y
> >                                                                ZTE Corp=
.
> >                                                         October 30, 201=
9
> >
> >
> >                              BFD for VXLAN
> >                         draft-ietf-bfd-vxlan-08
> >
> > Abstract
> >
> >    This document describes the use of the Bidirectional Forwarding
> >    Detection (BFD) protocol in point-to-point Virtual eXtensible Local
> >    Area Network (VXLAN) tunnels forming up an overlay network.
> >
> > Status of This Memo
> >
> >    This Internet-Draft is submitted in full conformance with the
> >    provisions of BCP 78 and BCP 79.
> >
> >    Internet-Drafts are working documents of the Internet Engineering
> >    Task Force (IETF).  Note that other groups may also distribute
> >    working documents as Internet-Drafts.  The list of current Internet-
> >    Drafts is at https://datatracker.ietf.org/drafts/current/.
> >
> >    Internet-Drafts are draft documents valid for a maximum of six month=
s
> >    and may be updated, replaced, or obsoleted by other documents at any
> >    time.  It is inappropriate to use Internet-Drafts as reference
> >    material or to cite them other than as "work in progress."
> >
> >    This Internet-Draft will expire on May 2, 2020.
> >
> > Copyright Notice
> >
> >    Copyright (c) 2019 IETF Trust and the persons identified as the
> >    document authors.  All rights reserved.
> >
> >    This document is subject to BCP 78 and the IETF Trust's Legal
> >    Provisions Relating to IETF Documents
> >    (https://trustee.ietf.org/license-info) in effect on the date of
> >    publication of this document.  Please review these documents
> >    carefully, as they describe your rights and restrictions with respec=
t
> >
> >
> >
> > Pallagatti, et al.         Expires May 2, 2020                  [Page 1=
]
> >
> > Internet-Draft                BFD for VXLAN                 October 201=
9
> >
> >
> >    to this document.  Code Components extracted from this document must
> >    include Simplified BSD License text as described in Section 4.e of
> >    the Trust Legal Provisions and are provided without warranty as
> >    described in the Simplified BSD License.
> >
> > Table of Contents
> >
> >    1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   =
2
> >    2.  Conventions used in this document . . . . . . . . . . . . . .   =
3
> >      2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   =
3
> >      2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   =
3
> >    3.  Deployment  . . . . . . . . . . . . . . . . . . . . . . . . .   =
4
> >    4.  BFD Packet Transmission over VXLAN Tunnel . . . . . . . . . .   =
5
> >    5.  Reception of BFD Packet from VXLAN Tunnel . . . . . . . . . .   =
7
> >      5.1.  Demultiplexing of the BFD Packet  . . . . . . . . . . . .   =
8
> >    6.  Use of the Specific VNI . . . . . . . . . . . . . . . . . . .   =
8
> >    7.  Echo BFD  . . . . . . . . . . . . . . . . . . . . . . . . . .   =
8
> >    8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   =
8
> >    9.  Security Considerations . . . . . . . . . . . . . . . . . . .   =
8
> >    10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   =
9
> >    11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   =
9
> >    12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   =
9
> >      12.1.  Normative References . . . . . . . . . . . . . . . . . .   =
9
> >      12.2.  Informational References . . . . . . . . . . . . . . . .  1=
0
> >    Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  1=
0
> >
> > 1.  Introduction
> >
> >    "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348] provides a=
n
> >    encapsulation scheme that allows building an overlay network by
> >    decoupling the address space of the attached virtual hosts from that
> >    of the network.
> >
> >    One use of VXLAN is in data centers interconnecting virtual machines
> >    (VMs) of a tenant.  VXLAN addresses requirements of the Layer 2 and
> >    Layer 3 data center network infrastructure in the presence of VMs in
> >    a multi-tenant environment by providing a Layer 2 overlay scheme on =
a
> >    Layer 3 network [RFC7348].  Another use is as an encapsulation for
> >    Ethernet VPN [RFC8365].
> >
> >    This document is written assuming the use of VXLAN for virtualized
> >    hosts and refers to VMs and VXLAN Tunnel End Points (VTEPs) in
> >    hypervisors.  However, the concepts are equally applicable to non-
> >    virtualized hosts attached to VTEPs in switches.
> >
> >    In the absence of a router in the overlay, a VM can communicate with
> >    another VM only if they are on the same VXLAN segment.  VMs are
> >    unaware of VXLAN tunnels as a VXLAN tunnel is terminated on a VTEP.
> >
> >
> >
> > Pallagatti, et al.         Expires May 2, 2020                  [Page 2=
]
> >
> > Internet-Draft                BFD for VXLAN                 October 201=
9
> >
> >
> >    VTEPs are responsible for encapsulating and decapsulating frames
> >    exchanged among VMs.
> >
> >    Ability to monitor path continuity, i.e., perform proactive
> >    continuity check (CC) for point-to-point (p2p) VXLAN tunnels, is
> >    important.  The asynchronous mode of BFD, as defined in [RFC5880], i=
s
> >    used to monitor a p2p VXLAN tunnel.
> >
> >    In the case where a Multicast Service Node (MSN) (as described in
> >    Section 3.3 of [RFC8293]) resides behind a Network Virtualization
> >    Endpoint (NVE), the mechanisms described in this document apply and
> >    can, therefore, be used to test the connectivity from the source NVE
> >    to the MSN.
> >
> >    This document describes the use of Bidirectional Forwarding Detectio=
n
> >    (BFD) protocol to enable monitoring continuity of the path between
> >    VXLAN VTEPs, performing as Network Virtualization Endpoints, and/or
> >    availability of a replicator multicast service node.
> >
> > 2.  Conventions used in this document
> >
> > 2.1.  Terminology
> >
> >    BFD Bidirectional Forwarding Detection
> >
> >    CC Continuity Check
> >
> >    p2p Point-to-point
> >
> >    MSN Multicast Service Node
> >
> >    NVE Network Virtualization Endpoint
> >
> >    VFI Virtual Forwarding Instance
> >
> >    VM Virtual Machine
> >
> >    VNI VXLAN Network Identifier (or VXLAN Segment ID)
> >
> >    VTEP VXLAN Tunnel End Point
> >
> >    VXLAN Virtual eXtensible Local Area Network
> >
> > 2.2.  Requirements Language
> >
> >    The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
> >    "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
> >    "OPTIONAL" in this document are to be interpreted as described in BC=
P
> >
> >
> >
> > Pallagatti, et al.         Expires May 2, 2020                  [Page 3=
]
> >
> > Internet-Draft                BFD for VXLAN                 October 201=
9
> >
> >
> >    14 [RFC2119] [RFC8174] when, and only when, they appear in all
> >    capitals, as shown here.
> >
> > 3.  Deployment
> >
> >    Figure 1 illustrates the scenario with two servers, each of them
> >    hosting two VMs.  The servers host VTEPs that terminate two VXLAN
> >    tunnels with VXLAN Network Identifier (VNI) number 100 and 200
> >    respectively.  Separate BFD sessions can be established between the
> >    VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 10=
0
> >    and 200).  An implementation that supports this specification MUST b=
e
> >    able to control the number of BFD sessions that can be created
> >    between the same pair of VTEPs.  BFD packets intended for a VTEP MUS=
T
> >    NOT be forwarded to a VM as a VM may drop BFD packets leading to a
> >    false negative.  This method is applicable whether the VTEP is a
> >    virtual or physical device.
> >
> >
> >       +------------+-------------+
> >       |        Server 1          |
> >       | +----+----+  +----+----+ |
> >       | |VM1-1    |  |VM1-2    | |
> >       | |VNI 100  |  |VNI 200  | |
> >       | |         |  |         | |
> >       | +---------+  +---------+ |
> >       |        VTEP (IP1)        |
> >       +--------------------------+
> >                             |
> >                             |   +-------------+
> >                             |   |   Layer 3   |
> >                             +---|   Network   |
> >                                 +-------------+
> >                                     |
> >                                     +-----------+
> >                                                 |
> >                                          +------------+-------------+
> >                                          |         VTEP (IP2)       |
> >                                          | +----+----+  +----+----+ |
> >                                          | |VM2-1    |  |VM2-2    | |
> >                                          | |VNI 100  |  |VNI 200  | |
> >                                          | |         |  |         | |
> >                                          | +---------+  +---------+ |
> >                                          |      Server 2            |
> >                                          +--------------------------+
> >
> >
> >                      Figure 1: Reference VXLAN Domain
> >
> >
> >
> >
> > Pallagatti, et al.         Expires May 2, 2020                  [Page 4=
]
> >
> > Internet-Draft                BFD for VXLAN                 October 201=
9
> >
> >
> >    At the same time, a service layer BFD session may be used between th=
e
> >    tenants of VTEPs IP1 and IP2 to provide end-to-end fault management.
> >    In such case, for VTEPs BFD Control packets of that session are
> >    indistinguishable from data packets.  If end-to-end defect detection
> >    is realized as the set of concatenated OAM domains, e.g., VM1-1 - IP=
1
> >    -- IP2 - VM2-1, then the BFD session over VXLAN between VTEPs SHOULD
> >    follow the procedures described in Section 6.8.17 [RFC5880].
> >
> >    As per Section 4, the inner destination IP address SHOULD be set to
> >    one of the loopback addresses (127/8 range for IPv4 and
> >    0:0:0:0:0:FFFF:7F00:0/104 range for IPv6).  There could be a firewal=
l
> >    configured on VTEP to block loopback addresses if set as the
> >    destination IP in the inner IP header.  It is RECOMMENDED to allow
> >    addresses from the loopback range through a firewall only if it is
> >    used as the destination IP address in the inner IP header, and the
> >    destination UDP port is set to 3784 [RFC5881].
> >
> > 4.  BFD Packet Transmission over VXLAN Tunnel
> >
> >    BFD packet MUST be encapsulated and sent to a remote VTEP as
> >    explained in this section.  Implementations SHOULD ensure that the
> >    BFD packets follow the same lookup path as VXLAN data packets within
> >    the sender system.
> >
> >    BFD packets are encapsulated in VXLAN as described below.  The VXLAN
> >    packet format is defined in Section 5 of [RFC7348].  The Outer IP/UD=
P
> >    and VXLAN headers MUST be encoded by the sender as defined in
> >    [RFC7348].
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Pallagatti, et al.         Expires May 2, 2020                  [Page 5=
]
> >
> > Internet-Draft                BFD for VXLAN                 October 201=
9
> >
> >
> >      0                   1                   2                   3
> >      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     |                                                               |
> >     ~                      Outer Ethernet Header                    ~
> >     |                                                               |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     |                                                               |
> >     ~                        Outer IPvX Header                      ~
> >     |                                                               |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     |                                                               |
> >     ~                        Outer UDP Header                       ~
> >     |                                                               |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     |                                                               |
> >     ~                           VXLAN Header                        ~
> >     |                                                               |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     |                                                               |
> >     ~                    Inner Ethernet Header                      ~
> >     |                                                               |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     |                                                               |
> >     ~                        Inner IPvX Header                      ~
> >     |                                                               |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     |                                                               |
> >     ~                         Inner UDP Header                      ~
> >     |                                                               |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     |                                                               |
> >     ~                       BFD Control Packet                     ~
> >     |                                                               |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     |                            FCS                                |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >
> >             Figure 2: VXLAN Encapsulation of BFD Control Packet
> >
> >    The BFD packet MUST be carried inside the inner Ethernet frame of th=
e
> >    VXLAN packet.  The choice of Destination MAC and Destination IP
> >    addresses for the inner Ethernet frame MUST ensure that the BFD
> >    Control packet is not forwarded to a tenant but is processed locally
> >    at the remote VTEP.  The inner Ethernet frame carrying the BFD
> >    Control packet- has the following format:
> >
> >       Ethernet Header:
> >
> >
> >
> > Pallagatti, et al.         Expires May 2, 2020                  [Page 6=
]
> >
> > Internet-Draft                BFD for VXLAN                 October 201=
9
> >
> >
> >          Destination MAC: This MUST NOT be of one of tenant's MAC
> >          addresses.  The destination MAC address MAY be the address
> >          associated with the destination VTEP.  The MAC address MAY be
> >          configured, or it MAY be learned via a control plane protocol.
> >          The details of how the MAC address is obtained are outside the
> >          scope of this document.
> >
> >          Source MAC: MAC address associated with the originating VTEP
> >
> >       IP header:
> >
> >          Destination IP: IP address MUST NOT be of one of tenant's IP
> >          addresses.  The IP address SHOULD be selected from the range
> >          127/8 for IPv4, for IPv6 - from the range
> >          0:0:0:0:0:FFFF:7F00:0/104.  Alternatively, the destination IP
> >          address MAY be set to VTEP's IP address.
> >
> >          Source IP: IP address of the originating VTEP.
> >
> >          TTL or Hop Limit: MUST be set to 1 to ensure that the BFD
> >          packet is not routed within the Layer 3 underlay network.  Thi=
s
> >          addresses the scenario when the inner IP destination address i=
s
> >          of VXLAN gateway and there is a router in underlay which
> >          removes the VXLAN header, then it is possible to route the
> >          packet as VXLAN  gateway address is routable address.
> >
> >       The fields of the UDP header and the BFD Control packet are
> >       encoded as specified in [RFC5881].
> >
> > 5.  Reception of BFD Packet from VXLAN Tunnel
> >
> >    Once a packet is received, VTEP MUST validate the packet.  If the
> >    Destination MAC of the inner Ethernet frame matches one of the MAC
> >    addresses associated with the VTEP the packet MUST be processed
> >    further.  If the Destination MAC of the inner Ethernet frame doesn't
> >    match any of VTEP's MAC addresses, then the processing of the
> >    received VXLAN packet MUST follow the procedures described in
> >    Section 4.1 [RFC7348].
> >
> >    The UDP destination port and the TTL of the inner IP packet MUST be
> >    validated to determine if the received packet can be processed by
> >    BFD.  BFD Control packets with unknown MAC address MUST NOT be
> >    forwarded to VMs.
> >
> >
> >
> >
> >
> >
> >
> >
> > Pallagatti, et al.         Expires May 2, 2020                  [Page 7=
]
> >
> > Internet-Draft                BFD for VXLAN                 October 201=
9
> >
> >
> > 5.1.  Demultiplexing of the BFD Packet
> >
> >    Demultiplexing of IP BFD packet has been defined in Section 3 of
> >    [RFC5881].  Since multiple BFD sessions may be running between two
> >    VTEPs, there needs to be a mechanism for demultiplexing received BFD
> >    packets to the proper session.  For demultiplexing packets with Your
> >    Discriminator equal to 0, a BFD session MUST be identified using the
> >    logical link over which the BFD Control packet is received.  In the
> >    case of VXLAN, the VNI number identifies that logical link.  If BFD
> >    packet is received with non-zero Your Discriminator, then BFD sessio=
n
> >    MUST be demultiplexed only with Your Discriminator as the key.
> >
> > 6.  Use of the Specific VNI
> >
> >    In most cases, a single BFD session is sufficient for the given VTEP
> >    to monitor the reachability of a remote VTEP, regardless of the
> >    number of VNIs.  When the single BFD session is used to monitor the
> >    reachability of the remote VTEP, an implementation SHOULD choose any
> >    of the VNIs.  An implementation MAY support the use of the Managemen=
t
> >    VNI as control and management channel between VTEPs.  The selection
> >    of the VNI number of the Management VNI MUST be controlled through
> >    management plane.  An implementation MAY use VNI number 1 as the
> >    default value for the Management VNI.  All VXLAN packets received on
> >    the Management VNI MUST be processed locally and MUST NOT be
> >    forwarded to a tenant.
> >
> > 7.  Echo BFD
> >
> >    Support for echo BFD is outside the scope of this document.
> >
> > 8.  IANA Considerations
> >
> >    This specification has no IANA action requested.  This section may b=
e
> >    deleted before the publication.
> >
> > 9.  Security Considerations
> >
> >    The document requires setting the inner IP TTL to 1, which could be
> >    used as a DDoS attack vector.  Thus the implementation MUST have
> >    throttling in place to control the rate of BFD Control packets sent
> >    to the control plane.  On the other hand, over-aggressive throttling
> >    of BFD Control packets may become the cause of the inability to form
> >    and maintain BFD session at scale.  Hence, throttling of BFD Control
> >    packets SHOULD be adjusted to permit BFD to work according to its
> >    procedures.
> >
> >    If the implementation supports establishing multiple BFD sessions
> >    between the same pair of VTEPs, there SHOULD be a mechanism to
> >
> >
> >
> > Pallagatti, et al.         Expires May 2, 2020                  [Page 8=
]
> >
> > Internet-Draft                BFD for VXLAN                 October 201=
9
> >
> >
> >    control the maximum number of such sessions that can be active at th=
e
> >    same time.
> >
> >    Other than inner IP TTL set to 1 and limit the number of BFD session=
s
> >    between the same pair of VTEPs, this specification does not raise an=
y
> >    additional security issues beyond those of the specifications
> >    referred to in the list of normative references.
> >
> > 10.  Contributors
> >
> >
> >    Reshad Rahman
> >    rrahman@cisco.com
> >    Cisco
> >
> >
> > 11.  Acknowledgments
> >
> >    Authors would like to thank Jeff Haas of Juniper Networks for his
> >    reviews and feedback on this material.
> >
> >    Authors would also like to thank Nobo Akiya, Marc Binderberger,
> >    Shahram Davari, Donald E.  Eastlake 3rd, and Anoop Ghanwani for the
> >    extensive reviews and the most detailed and helpful comments.
> >
> > 12.  References
> >
> > 12.1.  Normative References
> >
> >    [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
> >               Requirement Levels", BCP 14, RFC 2119,
> >               DOI 10.17487/RFC2119, March 1997,
> >               .
> >
> >    [RFC5880]  Katz, D. and D. Ward, "Bidirectional Forwarding Detection
> >               (BFD)", RFC 5880, DOI 10.17487/RFC5880, June 2010,
> >               .
> >
> >    [RFC5881]  Katz, D. and D. Ward, "Bidirectional Forwarding Detection
> >               (BFD) for IPv4 and IPv6 (Single Hop)", RFC 5881,
> >               DOI 10.17487/RFC5881, June 2010,
> >               .
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Pallagatti, et al.         Expires May 2, 2020                  [Page 9=
]
> >
> > Internet-Draft                BFD for VXLAN                 October 201=
9
> >
> >
> >    [RFC7348]  Mahalingam, M., Dutt, D., Duda, K., Agarwal, P., Kreeger,
> >               L., Sridhar, T., Bursell, M., and C. Wright, "Virtual
> >               eXtensible Local Area Network (VXLAN): A Framework for
> >               Overlaying Virtualized Layer 2 Networks over Layer 3
> >               Networks", RFC 7348, DOI 10.17487/RFC7348, August 2014,
> >               .
> >
> >    [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
> >               2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
> >               May 2017, .
> >
> > 12.2.  Informational References
> >
> >    [RFC8293]  Ghanwani, A., Dunbar, L., McBride, M., Bannai, V., and R.
> >               Krishnan, "A Framework for Multicast in Network
> >               Virtualization over Layer 3", RFC 8293,
> >               DOI 10.17487/RFC8293, January 2018,
> >               .
> >
> >    [RFC8365]  Sajassi, A., Ed., Drake, J., Ed., Bitar, N., Shekhar, R.,
> >               Uttaro, J., and W. Henderickx, "A Network Virtualization
> >               Overlay Solution Using Ethernet VPN (EVPN)", RFC 8365,
> >               DOI 10.17487/RFC8365, March 2018,
> >               .
> >
> > Authors' Addresses
> >
> >    Santosh Pallagatti (editor)
> >    VMware
> >
> >    Email: santosh.pallagatti@gmail.com
> >
> >
> >    Sudarsan Paragiri
> >    Individual Contributor
> >
> >    Email: sudarsan.225@gmail.com
> >
> >
> >    Vengada Prasad Govindan
> >    Cisco
> >
> >    Email: venggovi@cisco.com
> >
> >
> >
> >
> >
> >
> >
> >
> > Pallagatti, et al.         Expires May 2, 2020                 [Page 10=
]
> >
> > Internet-Draft                BFD for VXLAN                 October 201=
9
> >
> >
> >    Mallik Mudigonda
> >    Cisco
> >
> >    Email: mmudigon@cisco.com
> >
> >
> >    Greg Mirsky
> >    ZTE Corp.
> >
> >    Email: gregimirsky@gmail.com
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Pallagatti, et al.         Expires May 2, 2020                 [Page 11=
]
>
> >  http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
> > 
> >  class=3D"gr__www6_ietf_org"> content=3D"text/html; charset=3DUTF-8">
> >
> >   
> >   Diff: draft-ietf-bfd-vxlan-07.txt -
> draft-ietf-bfd-vxlan-08.txt
> >   
> >      
> > 
> > 
> >   
> >   
> >       <=
td
> class=3D"right">
> >       
> >       
> >       =

> >       
> >       
> >       
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> >       
> >       <=
td
> class=3D"right">
> >       
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> >       <=
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> class=3D"rblock">                        draft-ietf-bfd-vxlan-0 class=3D"insert">8
> >       <=
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> class=3D"right">
> >       
> 
> >       <=
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> class=3D"right">
> >       
> >       
> >       
> >       <=
td
> class=3D"right">
> >       
> >       <=
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> class=3D"right">
> >        class=3D"right">   This Internet-Draft is submitted in full conformance w=
ith
> the
> >       <=
td
> class=3D"right">
> >       
> >       
> >       
> >       
> >       
> >       <=
td
> class=3D"right">
> >       
> >       <=
td
> class=3D"right">   and may be updated, replaced, or obsoleted by other
> documents at any
> >       
> >       
> >       <=
td
> class=3D"right">
> >       
> >       
> >       <=
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> class=3D"right">
> >       
> >       <=
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> class=3D"right">
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> >       
> >       <=
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> class=3D"right">
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> >       
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> >       
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> >       
> >       
> >       
> >        class=3D"right">   9.  Security Considerations . . . . . . . . . . . . . =
. .
> . . . .   8
> >       
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> >       
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> >       <=
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> >       
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> class=3D"right">
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> >       
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> >        class=3D"lineno">
> >       <=
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> class=3D"right">
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> >       <=
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> class=3D"right">
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> >       
> >       
> >       
> >       <=
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> class=3D"right">
> >       
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> >       <=
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> class=3D"right">
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> class=3D"right">
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> >       <=
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> class=3D"right">
> >       
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> >       <=
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> class=3D"right">
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> >       <=
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> class=3D"right">
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> >       
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> >       <=
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> class=3D"right">
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> >       <=
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> class=3D"right">
> >       
> >       
> >       
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> >       <=
td
> class=3D"rblock">   reachability of the remote VTEP, an implementation SH=
OULD
> choose any
> >       
> >       
> >       
> >       
> >       =

> >       
> >       
> >       <=
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> class=3D"right">
> >       
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> class=3D"right">
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> class=3D"right">
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> class=3D"right">
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> class=3D"right">
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> class=3D"right">
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> >       <=
/tr>
> >       
> >       
> >       
> >       <=
td
> class=3D"right">
> >       
> >       <=
/tr>
> >       =

> >       
> >       
> >       <=
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> class=3D"right">
> >       
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> class=3D"right">
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> class=3D"right">
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> >       <=
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> class=3D"right">
> >       
> >       <=
td
> class=3D"right">
> >       <=
td
> class=3D"right">   [RFC8365]  Sajassi, A., Ed., Drake, J., Ed., Bitar, N.=
,
> Shekhar, R.,
> >       
> >       
> >       
> >       
> >       <=
td
> class=3D"right">
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> 
> >
> >      
> >      
> >      
> >      
> >    
 https://www6.ietf.org/rfcdiff?url2=3Ddraft-ietf-bfd-vxlan-07.txt"
> style=3D"color:#008; text-decoration:none;"><  https://tools.ietf.org/html/draft-ietf-bfd-vxlan-07.txt"
> style=3D"color:#008">draft-ietf-bfd-vxlan-07.txt 
>   https://tools.ietf.org/html/draft-ietf-bfd-vxlan-08.txt"
> style=3D"color:#008">draft-ietf-bfd-vxlan-08.txt  https://www6.ietf.org/rfcdiff?url1=3Ddraft-ietf-bfd-vxlan-08.txt"
> style=3D"color:#008; text-decoration:none;">>
 
BFD
>                                  S. Pallagatti, Ed.  class=3D"right">BFD                                                   S.
> Pallagatti, Ed.
Internet-Draft
>                                               class=3D"delete">Rtbrick  class=3D"rblock">Internet-Draft
>       VMware
Intended status:
> Standards Track                             S. Paragiri  class=3D"right">Intended status: Standards Track
>  S. Paragiri
Expires:  class=3D"delete">November 18, 2019                        Individu=
al
> Contributor Expires:  class=3D"insert">May 2, 2020                              Individu=
al
> Contributor

>                                        V. Govindan  class=3D"right">
>  V. Govindan

>                                       M. Mudigonda  class=3D"right">
> M. Mudigonda

>                                              Cisco  class=3D"right">
>      Cisco

>                                          G. Mirsky  class=3D"right">
>  G. Mirsky

>                                          ZTE Corp.  class=3D"right">
>  ZTE Corp.

>                                         May 17,
> 2019 
>                   October 30, 2019 class=3D"lineno">
 

>        BFD for VXLAN 
>        BFD for VXLAN

>     draft-ietf-bfd-vxlan-07 
 
AbstractAbstract
 
   This document
> describes the use of the Bidirectional Forwarding  class=3D"right">   This document describes the use of the Bidirectional
> Forwarding
   Detection (BF=
D)
> protocol in point-to-point Virtual eXtensible Local  class=3D"right">   Detection (BFD) protocol in point-to-point Virtual
> eXtensible Local
   Area Network
> (VXLAN) tunnels forming up an overlay network.  class=3D"right">   Area Network (VXLAN) tunnels forming up an overlay
> network.
 
Status of This
> Memo Status of This Memo class=3D"lineno">
 
   This
> Internet-Draft is submitted in full conformance with the 
 
skipping t=
o
> change at https://www6.ietf.org/rfcdiff/rfcdiff.pyht#part-2"> page 1, line
> 38 =C2=B6 s=
kipping
> to change at https://www6.ietf.org/rfcdiff/rfcdiff.pyht#part-2"> page 1, line
> 38 =C2=B6
   Internet-Draf=
ts
> are working documents of the Internet Engineering  class=3D"right">   Internet-Drafts are working documents of the Internet
> Engineering
   Task Force
> (IETF).  Note that other groups may also distribute  class=3D"right">   Task Force (IETF).  Note that other groups may also
> distribute
   working docum=
ents
> as Internet-Drafts.  The list of current Internet-  class=3D"right">   working documents as Internet-Drafts.  The list of cur=
rent
> Internet-
   Drafts is at
> https://datatracker.ietf.org/drafts/current/.  class=3D"right">   Drafts is at https://datatracker.ietf.org/drafts/curre=
nt/. class=3D"lineno">
 
   Internet-Draf=
ts
> are draft documents valid for a maximum of six months  class=3D"right">   Internet-Drafts are draft documents valid for a maximu=
m of
> six months
   and may be
> updated, replaced, or obsoleted by other documents at any 
   time.  It is
> inappropriate to use Internet-Drafts as reference  class=3D"right">   time.  It is inappropriate to use Internet-Drafts as
> reference
   material or t=
o
> cite them other than as "work in progress."  class=3D"right">   material or to cite them other than as "work in
> progress."
 
   This
> Internet-Draft will expire on November 18,
> 2019.    This Internet-Draft wi=
ll
> expire on May 2, 2020. class=3D"lineno">
 
Copyright
> Notice Copyright Notice class=3D"lineno">
 
   Copyright (c)=
 2019
> IETF Trust and the persons identified as the  class=3D"right">   Copyright (c) 2019 IETF Trust and the persons identifi=
ed
> as the
   document auth=
ors.
> All rights reserved.    document author=
s.
> All rights reserved.
 
   This document=
 is
> subject to BCP 78 and the IETF Trust's Legal  class=3D"right">   This document is subject to BCP 78 and the IETF Trust'=
s
> Legal
   Provisions
> Relating to IETF Documents    Provision=
s
> Relating to IETF Documents
   (
> https://trustee.ietf.org/license-info) in effect on the date of
>    (https://trustee.ietf.org/license-info) in
> effect on the date of
   publication o=
f
> this document.  Please review these documents  class=3D"right">   publication of this document.  Please review these
> documents
 
skipping t=
o
> change at https://www6.ietf.org/rfcdiff/rfcdiff.pyht#part-3"> page 2, line
> 17 =C2=B6 s=
kipping
> to change at https://www6.ietf.org/rfcdiff/rfcdiff.pyht#part-3"> page 2, line
> 17 =C2=B6
   described in =
the
> Simplified BSD License.    described in=
 the
> Simplified BSD License.
 
Table of
> Contents Table of Contents class=3D"lineno">
 
   1.  Introduct=
ion
> . . . . . . . . . . . . . . . . . . . . . . . .   2  class=3D"right">   1.  Introduction  . . . . . . . . . . . . . . . . . . =
. .
> . . . .   2
   2.  Conventio=
ns
> used in this document . . . . . . . . . . . . . .   3  class=3D"right">   2.  Conventions used in this document . . . . . . . . =
. .
> . . . .   3
     2.1.
> Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
>      2.1.  Terminology . . . . . . . . . . . . .=
 . .
> . . . . . . . .   3
     2.2.
> Requirements Language . . . . . . . . . . . . . . . . . .   3
>      2.2.  Requirements Language . . . . . . . .=
 . .
> . . . . . . . .   3
   3.  Deploymen=
t  .
> . . . . . . . . . . . . . . . . . . . . . . . .   4  class=3D"right">   3.  Deployment  . . . . . . . . . . . . . . . . . . . =
. .
> . . . .   4
   4.  BFD Packe=
t
> Transmission over VXLAN Tunnel . . . . . . . . . .   5  class=3D"right">   4.  BFD Packet Transmission over VXLAN Tunnel . . . . =
. .
> . . . .   5
 class=3D"delete">     4.1.  BFD Packet Encapsulation in VXLAN . . . . . .=
 . .
> . . . .   6  class=3D"lineno">
   5.  Reception=
 of
> BFD Packet from VXLAN Tunnel . . . . . . . . . .   7  class=3D"right">   5.  Reception of BFD Packet from VXLAN Tunnel . . . . =
. .
> . . . .   7
     5.1.
> Demultiplexing of the BFD Packet  . . . . . . . . . . . .    class=3D"delete">7      5.1.
> Demultiplexing of the BFD Packet  . . . . . . . . . . . .    class=3D"insert">8
   6.  Use of th=
e
> Specific VNI . . . . . . . . . . . . . . . . . . .   8  class=3D"right">   6.  Use of the Specific VNI . . . . . . . . . . . . . =
. .
> . . . .   8
   7.  Echo BFD =
 . .
> . . . . . . . . . . . . . . . . . . . . . . . .   8  class=3D"right">   7.  Echo BFD  . . . . . . . . . . . . . . . . . . . . =
. .
> . . . .   8
   8.  IANA
> Considerations . . . . . . . . . . . . . . . . . . . . .   8
>    8.  IANA Considerations . . . . . . . . . . .=
 . .
> . . . . . . . .   8
   9.  Security
> Considerations . . . . . . . . . . . . . . . . . . .   8 
   10.
> Contributors  . . . . . . . . . . . . . . . . . . . . . . . .    class=3D"delete">8    10.
> Contributors  . . . . . . . . . . . . . . . . . . . . . . . .    class=3D"insert">9
   11.
> Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9   11. Acknowledgments . . . . . . . . . . . . .=
 . .
> . . . . . . . .   9
   12. Reference=
s  .
> . . . . . . . . . . . . . . . . . . . . . . . .   9  class=3D"right">   12. References  . . . . . . . . . . . . . . . . . . . =
. .
> . . . .   9
     12.1.  Norm=
ative
> References . . . . . . . . . . . . . . . . . .   9  class=3D"right">     12.1.  Normative References . . . . . . . . . . . . =
. .
> . . . .   9
     12.2.
> Informational References . . . . . . . . . . . . . . . .   class=3D"delete"> 9      12.2.
> Informational References . . . . . . . . . . . . . . . .   class=3D"insert">10
   Authors'
> Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10
>    Authors' Addresses  . . . . . . . . . . . . .=
 . .
> . . . . . . . .  10
 
1.
> Introduction 1.  Introduction class=3D"lineno">
 
   "Virtual
> eXtensible Local Area Network" (VXLAN) [RFC7348] provides an
>    "Virtual eXtensible Local Area Network" (VXLA=
N)
> [RFC7348] provides an
   encapsulation
> scheme that allows building an overlay network by  class=3D"right">   encapsulation scheme that allows building an overlay
> network by
   decoupling th=
e
> address space of the attached virtual hosts from that  class=3D"right">   decoupling the address space of the attached virtual h=
osts
> from that
   of the
> network.    of the network. class=3D"lineno">
 
   One use of VX=
LAN
> is in data centers interconnecting virtual machines  class=3D"right">   One use of VXLAN is in data centers interconnecting
> virtual machines
 
skipping t=
o
> change at https://www6.ietf.org/rfcdiff/rfcdiff.pyht#part-4"> page 3, line
> 5 =C2=B6 sk=
ipping to
> change at https://www6.ietf.org/rfcdiff/rfcdiff.pyht#part-4"> page 3, line
> 4 =C2=B6
   Ethernet VPN
> [RFC8365].    Ethernet VPN
> [RFC8365].
 
   This document=
 is
> written assuming the use of VXLAN for virtualized  class=3D"right">   This document is written assuming the use of VXLAN for
> virtualized
   hosts and ref=
ers
> to VMs and VXLAN Tunnel End Points (VTEPs) in  class=3D"right">   hosts and refers to VMs and VXLAN Tunnel End Points
> (VTEPs) in
   hypervisors.
> However, the concepts are equally applicable to non-  class=3D"right">   hypervisors.  However, the concepts are equally applic=
able
> to non-
   virtualized h=
osts
> attached to VTEPs in switches. 
>  virtualized hosts attached to VTEPs in switches. class=3D"lineno">
 
   In the absenc=
e of
> a router in the overlay, a VM can communicate with  class=3D"right">   In the absence of a router in the overlay, a VM can
> communicate with
   another VM on=
ly if
> they are on the same VXLAN segment.  VMs are  class=3D"right">   another VM only if they are on the same VXLAN segment.
> VMs are
   unaware of VX=
LAN
> tunnels as a VXLAN tunnel is terminated on a VTEP.  class=3D"right">   unaware of VXLAN tunnels as a VXLAN tunnel is terminat=
ed
> on a VTEP.
  class=3D"rblock">
>                                  
   VTEPs are
> responsible for encapsulating and decapsulating frames  class=3D"right">   VTEPs are responsible for encapsulating and decapsulat=
ing
> frames
   exchanged amo=
ng
> VMs.    exchanged among VMs. class=3D"lineno">
 
   Ability to mo=
nitor
> path continuity, i.e., perform proactive 
>  Ability to monitor path continuity, i.e., perform proactive class=3D"lineno">
   continuity ch=
eck
> (CC) for point-to-point (p2p) VXLAN tunnels, is  class=3D"right">   continuity check (CC) for point-to-point (p2p) VXLAN
> tunnels, is
   important. =
 The
> asynchronous mode of BFD, as defined in [RFC5880],  class=3D"rblock">   important.  The asynchronous mode of BFD, as defined =
in
> [RFC5880], is
    class=3D"delete">can be used to monitor a p2p VXLAN tunnel.   used to monitor a p2p VXLAN tunnel. class=3D"lineno">
 
   In the case w=
here
> a Multicast Service Node (MSN) (as described in  class=3D"right">   In the case where a Multicast Service Node (MSN) (as
> described in
   Section 3.3=
 of
> [RFC8293]) resides behind an NVE, the
> mechanisms    Section 3.3 of [RFC8293]=
)
> resides behind a Network Virtualization class=3D"lineno">
   described i=
n
> this document apply and can, therefore, be used to test  class=3D"rblock">   Endpoint (NVE), the
> mechanisms described in this document apply and class=3D"lineno">
   the connect=
ivity
> from the source NVE to the MSN.    can=
,
> therefore, be used to test the connectivity from the source NVE class=3D"lineno">
  class=3D"rblock">   to the MSN.
 
   This document
> describes the use of Bidirectional Forwarding Detection  class=3D"right">   This document describes the use of Bidirectional
> Forwarding Detection
   (BFD) protoco=
l to
> enable monitoring continuity of the path between  class=3D"right">   (BFD) protocol to enable monitoring continuity of the =
path
> between
   VXLAN VTEPs,
> performing as Network Virtualization Endpoints, and/or  class=3D"right">   VXLAN VTEPs, performing as Network Virtualization
> Endpoints, and/or
   availability =
of a
> replicator multicast service node. 
>  availability of a replicator multicast service node. class=3D"lineno">
 
2.  Conventions =
used
> in this document 2.  Conventions used i=
n
> this document
 
2.1.
> Terminology 2.1.  Terminology class=3D"lineno">
 
   BFD Bidirecti=
onal
> Forwarding Detection    BFD Bidirection=
al
> Forwarding Detection
 
   CC Continuity
> Check    CC Continuity Check class=3D"lineno">
 
   p2p
> Point-to-point    p2p
> Point-to-point
 
   MSN Multicast
> Service Node    MSN Multicast Service
> Node
 
  class=3D"rblock">   NVE Network Virtualization
> Endpoint
  class=3D"rblock">
>              
   VFI Virtual
> Forwarding Instance    VFI Virtual
> Forwarding Instance
 
   VM Virtual
> Machine    VM Virtual Machine class=3D"lineno">
 
  class=3D"rblock">   VNI VXLAN Network Identifier (=
or
> VXLAN Segment ID)
  class=3D"rblock">
>              
   VTEP VXLAN Tu=
nnel
> End Point    VTEP VXLAN Tunnel End
> Point
 
   VXLAN Virtual
> eXtensible Local Area Network    VXLAN
> Virtual eXtensible Local Area Network
 
2.2.  Requiremen=
ts
> Language 2.2.  Requirements
> Language
 
   The key words
> "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",  class=3D"right">   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL",
> "SHALL NOT",
   "SHOULD", "SH=
OULD
> NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and  class=3D"right">   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDE=
D",
> "MAY", and
   "OPTIONAL" in=
 this
> document are to be interpreted as described in BCP  class=3D"right">   "OPTIONAL" in this document are to be interpreted as
> described in BCP
   14 [RFC2119]
> [RFC8174] when, and only when, they appear in all  class=3D"right">   14 [RFC2119] [RFC8174] when, and only when, they appea=
r in
> all
   capitals, as =
shown
> here.    capitals, as shown here.
 
3.
> Deployment 3.  Deployment class=3D"lineno">
 
   Figure 1
> illustrates the scenario with two servers, each of them  class=3D"right">   Figure 1 illustrates the scenario with two servers, ea=
ch
> of them
   hosting two V=
Ms.
> The servers host VTEPs that terminate two VXLAN  class=3D"right">   hosting two VMs.  The servers host VTEPs that terminat=
e
> two VXLAN
   tunnels wit=
h
> VNI number 100 and 200 respectively.  Separ=
ate
> BFD    tunnels with  class=3D"insert">VXLAN Network Identifier (VNI) number 100 and
> 200
   sessions ca=
n be
> established between the VTEPs (IP1 and IP2) for  class=3D"rblock">   respectively.  Separate BFD sessions can be establish=
ed
> between the
   monitoring =
each
> of the VXLAN tunnels (VNI 100 and 200).  An  class=3D"rblock">   VTEPs (IP1 and IP2) for monitoring each of the VXLAN
> tunnels (VNI 100
   implementat=
ion
> that supports this specification MUST be able to  class=3D"rblock">   and 200).  An implementation that supports this
> specification MUST be
   control the
> number of BFD sessions that can be created between the  class=3D"rblock">   able to control the number of BFD sessions that can b=
e
> created
   same pair o=
f
> VTEPs.  BFD packets intended for a Hypervisor
> VTEP MUST    between the same pair of
> VTEPs.  BFD packets intended for a VTEP MUST class=3D"lineno">
   NOT be forwar=
ded
> to a VM as a VM may drop BFD packets leading to a  class=3D"right">   NOT be forwarded to a VM as a VM may drop BFD packets
> leading to a
   false negativ=
e.
> This method is applicable whether the VTEP is a  class=3D"right">   false negative.  This method is applicable whether the
> VTEP is a
   virtual or
> physical device.    virtual or physical
> device.
 

> +------------+-------------+ 
> +------------+-------------+
      |        S=
erver
> 1          |       |        Server 1
>   |
 class=3D"delete">      |                          |  class=3D"rblock">
      | +----+--=
--+
> +----+----+ |       | +----+----+
> +----+----+ |
      | |VM1-1  =
  |
> |VM1-2    | |       | |VM1-1    |  |VM1=
-2
>   | |
      | |VNI 100=
  |
> |VNI 200  | |       | |VNI 100  |  |VNI
> 200  | |
      | |       =
  |
> |         | |       | |         |  |
>  | |
      | +-------=
--+
> +---------+ |       | +---------+
> +---------+ |
      |  class=3D"delete">Hypervisor VTEP (IP1)    |  class=3D"rblock">      |        VTEP (IP1)    
> |

> +--------------------------+ 
> +--------------------------+

>       | 
> |

>         |  class=3D"rblock">
 class=3D"delete">                            |  class=3D"rblock">

>       |   +-------------+ 
>           |   +-------------+

>       |   |   Layer 3   | 
>           |   |   Layer 3   |

>         |---|   Network    class=3D"delete">| 
>           +---|   Network   | class=3D"lineno">
 class=3D"delete">                                |
>  | 

>           +-------------+ 
>               +-------------+

>               | 
>         |
 class=3D"delete">                                    |
> 

>               +-----------+ 
>                     +-----------+

>                           | 
>                                 |
 class=3D"delete">
> | 

>                    +------------+-------------+  class=3D"right">
>  +------------+-------------+

>                      |    Hypervisor VTEP (IP2)
> | 
>  |         VTEP (IP2)       | class=3D"lineno">

>                    | +----+----+  +----+----+ |  class=3D"right">                                         | +----+----+
> +----+----+ |

>                    | |VM2-1    |  |VM2-2    | |  class=3D"right">                                         | |VM2-1    |
> |VM2-2    | |

>                    | |VNI 100  |  |VNI 200  | |  class=3D"right">                                         | |VNI 100  |  |=
VNI
> 200  | |

>                    | |         |  |         | |  class=3D"right">                                         | |         |  |
>      | |

>                    | +---------+  +---------+ |  class=3D"right">                                         | +---------+
> +---------+ |

>                    |      Server 2            |  class=3D"right">                                         |      Server 2
>       |

>                    +--------------------------+  class=3D"right">
>  +--------------------------+
 

>  Figure 1: Reference VXLAN Domain 
>            Figure 1: Reference VXLAN Domain class=3D"lineno">
 
  class=3D"rblock">   At the same time, a service la=
yer
> BFD session may be used between the
  class=3D"rblock">   tenants of VTEPs IP1 and IP2 t=
o
> provide end-to-end fault management. class=3D"lineno">
  class=3D"rblock">   In such case, for VTEPs BFD Co=
ntrol
> packets of that session are
  class=3D"rblock">   indistinguishable from data
> packets.  If end-to-end defect detection class=3D"lineno">
  class=3D"rblock">   is realized as the set of
> concatenated OAM domains, e.g., VM1-1 - IP1 class=3D"lineno">
  class=3D"rblock">   -- IP2 - VM2-1, then the BFD s=
ession
> over VXLAN between VTEPs SHOULD
  class=3D"rblock">   follow the procedures describe=
d in
> Section 6.8.17 [RFC5880].
  class=3D"rblock"> class=3D"lineno">
  class=3D"rblock">   As per Section 4, the inner
> destination IP address SHOULD be set to class=3D"lineno">
  class=3D"rblock">   one of the loopback addresses =
(127/8
> range for IPv4 and
  class=3D"rblock">   0:0:0:0:0:FFFF:7F00:0/104 rang=
e for
> IPv6).  There could be a firewall
  class=3D"rblock">   configured on VTEP to block lo=
opback
> addresses if set as the
  class=3D"rblock">   destination IP in the inner IP
> header.  It is RECOMMENDED to allow
  class=3D"rblock">   addresses from the loopback ra=
nge
> through a firewall only if it is
  class=3D"rblock">   used as the destination IP add=
ress
> in the inner IP header, and the
  class=3D"rblock">   destination UDP port is set to=
 3784
> [RFC5881].
  class=3D"rblock">
>              
4.  BFD Packet
> Transmission over VXLAN Tunnel 4.  BFD
> Packet Transmission over VXLAN Tunnel
 
   BFD packet MU=
ST be
> encapsulated and sent to a remote VTEP as 
>  BFD packet MUST be encapsulated and sent to a remote VTEP as class=3D"lineno">
   explained i=
n
> Section 4.1.  Implementations SHOULD ensure
> that the BFD    explained in  class=3D"insert">this section.  Implementations SHOULD ensure that
> the
   packets fol=
low
> the same lookup path as VXLAN data packets within the  class=3D"rblock">   BFD packets follow the same lookup path as VXLAN data
> packets within
   sender
> system.    the sender system. class=3D"lineno">

>                                                        class=3D"rblock">
 class=3D"delete">4.1.  BFD Packet Encapsulation in VXLAN
> 
 
   BFD packets a=
re
> encapsulated in VXLAN as described below.  The VXLAN  class=3D"right">   BFD packets are encapsulated in VXLAN as described bel=
ow.
> The VXLAN
   packet format=
 is
> defined in Section 5 of [RFC7348].  The Outer IP/UDP  class=3D"right">   packet format is defined in Section 5 of [RFC7348].  T=
he
> Outer IP/UDP
   and VXLAN hea=
ders
> MUST be encoded by the sender as defined in  class=3D"right">   and VXLAN headers MUST be encoded by the sender as def=
ined
> in

>  [RFC7348].    [RFC7348]. class=3D"lineno">
 
     0
>    1                   2                   3  class=3D"right">     0                   1                   2
>    3
     0 1 2 3 4 5=
 6 7
> 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1  class=3D"right">     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 =
6 7
> 8 9 0 1

> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ class=3D"lineno">
    |
>                                                |  class=3D"right">    |
>        |
 
skipping t=
o
> change at https://www6.ietf.org/rfcdiff/rfcdiff.pyht#part-5"> page 6, line
> 44 =C2=B6 s=
kipping
> to change at https://www6.ietf.org/rfcdiff/rfcdiff.pyht#part-5"> page 6, line
> 37 =C2=B6

> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ class=3D"lineno">
    |
>                                                |  class=3D"right">    |
>        |
    ~
>         Inner IPvX Header                      ~  class=3D"right">    ~                        Inner IPvX Header
>       ~
    |
>                                                |  class=3D"right">    |
>        |

> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ class=3D"lineno">
    |
>                                                |  class=3D"right">    |
>        |
    ~
>          Inner UDP Header                      ~  class=3D"right">    ~                         Inner UDP Header
>       ~
    |
>                                                |  class=3D"right">    |
>        |

> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ class=3D"lineno">
    |
>                                                |  class=3D"right">    |
>        |
    ~
>          BFD Control Message
>  ~     ~                       BFD Con=
trol
> Packet                     ~ class=3D"lineno">
    |
>                                                |  class=3D"right">    |
>        |

> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ class=3D"lineno">
    |
>             FCS                                |  class=3D"right">    |                            FCS
>       |

> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ class=3D"lineno">
 
            class=3D"delete">Figure 2: VXLAN Encapsulation of BFD Control
> Message             class=3D"insert"> Figure 2: VXLAN Encapsulation of BFD Control
> Packet
 
   The BFD pac=
ket
> MUST be carried inside the inner MAC frame =
of
> the    The BFD packet MUST be carried
> inside the inner Ethernet frame of the class=3D"lineno">
   VXLAN packe=
t.
> The inner MAC frame carrying the BFD  class=3D"delete">payload has the 
>  VXLAN packet.  The choice of Destination M=
AC
> and Destination IP class=3D"lineno">
   following
> format:    addr=
esses
> for the inner Ethernet frame MUST ensure that the BFD class=3D"lineno">
  class=3D"rblock">   Control packet is not forwarde=
d to a
> tenant but is processed locally
  class=3D"rblock">   at the remote VTEP.  The inner
> Ethernet frame carrying the BFD
  class=3D"rblock">   Control packet- has the
> following format:
 
      Ethernet
> Header:       Ethernet Header: class=3D"lineno">
 

>  Destination MAC: This MUST be the dedicated
> MAC TBA (Section 8)  class=3D"rblock">         Destination MAC: This MUST  class=3D"insert">NOT be of one of tenant's<=
/span>
> MAC
 class=3D"delete">         or the MAC address  class=3D"delete">of the destination VTEP.  The details of how
>          addresses.  The
> destination MAC address MAY be the
> address
         the M=
AC
> address of the destination VTEP is obtained=
 are
> outside 
>  associated with the destination VTEP.  The MAC
> address MAY be
         the s=
cope
> of this document. 
>      configured, or it MAY be learned via a control plane
> protocol.
  class=3D"rblock">         The details of ho=
w the
> MAC address is obtained are outside the
  class=3D"rblock">         scope of this document. class=3D"lineno">
 
         Sourc=
e
> MAC: MAC address of the originating
> VTEP          Source MAC: MAC address
> associated with the originating VTEP
 
      IP
> header:       IP header: class=3D"lineno">
 
          class=3D"delete">Source IP: IP address of the  class=3D"delete">originating VTEP. 
>        Destination IP: IP address  class=3D"insert">MUST NOT be of one of tena=
nt's
> IP
  class=3D"rblock">         addresses.  The IP addre=
ss
> SHOULD be selected from the range
  class=3D"rblock">         127/8 for IPv4, for IPv6=
 -
> from the range class=3D"lineno">
  class=3D"rblock">         0:0:0:0:0:FFFF:7F00:0/10=
4.
> Alternatively, the destination IP
  class=3D"rblock">         address MAY be set to VT=
EP's
> IP address.
 
          class=3D"delete">Destination IP: IP address of the terminating
> VTEP.          =
Source
> IP: IP address of the originating VTEP. class=3D"lineno">
 
          class=3D"delete">TTL: MUST be set to 1 to ensure that the BFD pack=
et
> is not          TTL
> or Hop Limit: MUST be set to 1 to ensure that the BFD class=3D"lineno">
         route=
d
> within the L3 underlay network.
>          packet is not routed within the  class=3D"insert">Layer 3 underlay network.   class=3D"insert">This
  class=3D"rblock">         addresses the scenario w=
hen
> the inner IP destination address is
  class=3D"rblock">         of VXLAN gateway and the=
re is
> a router in underlay which
  class=3D"rblock">         removes the VXLAN header=
, then
> it is possible to route the
  class=3D"rblock">         packet as VXLAN  gateway
> address is routable address.
 
      The fiel=
ds of
> the UDP header and the BFD control packet
> are       The fields of the UDP header=
 and
> the BFD Control packet are class=3D"lineno">
      encoded as
> specified in [RFC5881].       encoded a=
s
> specified in [RFC5881].
 
5.  Reception of=
 BFD
> Packet from VXLAN Tunnel 5.  Reception =
of
> BFD Packet from VXLAN Tunnel
 
   Once a packet=
 is
> received, VTEP MUST validate the packet.  If the  class=3D"right">   Once a packet is received, VTEP MUST validate the pack=
et.
> If the
   Destination=
 MAC
> of the inner MAC frame matches  class=3D"delete">the dedicated MAC or  class=3D"rblock">   Destination MAC of the inner  class=3D"insert">Ethernet frame matches one
> of the MAC
   the MAC  class=3D"delete">address of the VTEP the packet MUST be processed
> further.    add=
resses
> associated with the VTEP the packet MUST be processed class=3D"lineno">
  class=3D"rblock">   further.  If the Destination M=
AC of
> the inner Ethernet frame doesn't
  class=3D"rblock">   match any of VTEP's MAC addres=
ses,
> then the processing of the
  class=3D"rblock">   received VXLAN packet MUST fol=
low
> the procedures described in
  class=3D"rblock">   Section 4.1
> [RFC7348].
 
   The UDP
> destination port and the TTL of the inner IP packet MUST be
>    The UDP destination port and the TTL of the i=
nner
> IP packet MUST be
   validated to
> determine if the received packet can be processed by  class=3D"right">   validated to determine if the received packet can be
> processed by
   BFD.  BFD <=
span
> class=3D"delete">packet with inner MAC set =
to
> VTEP or dedicated MAC address 
>  BFD.  BFD Control packets with  class=3D"insert">unknown MAC address MUST NOT be class=3D"lineno">
   MUST NOT be
> forwarded to VMs.    forwarded to
> VMs.
 
5.1.  Demultiple=
xing
> of the BFD Packet 5.1.  Demultiplexing =
of
> the BFD Packet
 
   Demultiplexin=
g of
> IP BFD packet has been defined in Section 3 of  class=3D"right">   Demultiplexing of IP BFD packet has been defined in
> Section 3 of
   [RFC5881].  S=
ince
> multiple BFD sessions may be running between two  class=3D"right">   [RFC5881].  Since multiple BFD sessions may be running
> between two
   VTEPs, there =
needs
> to be a mechanism for demultiplexing received BFD  class=3D"right">   VTEPs, there needs to be a mechanism for demultiplexin=
g
> received BFD
   packets to =
the
> proper session.  The procedure for
> demultiplexing    packets to the prope=
r
> session.  For demultiplexing packets with
> Your
   packets wit=
h
> Your Discriminator equal to 0 is different
> from    Discriminator equal to
> 0, a BFD session MUST be identified using
> the
 class=3D"delete">   [RFC5880].  For such packets, the BFD session =
MUST
> be identified     class=3D"insert">logical link over which the BFD
> Control packet is received.  In the
   using the <=
span
> class=3D"delete">inner headers, i.e., the source IP, the  class=3D"delete">destination IP, and  class=3D"rblock">   case of  class=3D"insert">VXLAN, the VNI number iden=
tifies
> that logical link.  If BFD
 class=3D"delete">   the source UDP port number present in the IP header
> carried by the    packet is
> received with non-zero Your Discriminator, then BFD session class=3D"lineno">
    class=3D"delete">payload of the VXLAN
> encapsulated packet.  The VNI of the
> packet    MUST be demultiplexed
> only with Your Discriminator as the key.
 class=3D"delete">   SHOULD be used to derive interface-related informatio=
n
> for  class=3D"lineno">
 class=3D"delete">   demultiplexing the packet.  If BFD packet is
> received with non-zero  class=3D"lineno">
   Your
> Discriminator, then BFD session MUST be demultiplexed only with
> 
   Your
> Discriminator as the key.  class=3D"lineno">
 
6.  Use of the
> Specific VNI 6.  Use of the Specific
> VNI
 
   In most cases=
, a
> single BFD session is sufficient for the given VTEP  class=3D"right">   In most cases, a single BFD session is sufficient for =
the
> given VTEP
   to monitor th=
e
> reachability of a remote VTEP, regardless of the  class=3D"right">   to monitor the reachability of a remote VTEP, regardle=
ss
> of the
   number of <=
span
> class=3D"delete">VNIs in common.  When the single BFD session is u=
sed
> to    number of  class=3D"insert">VNIs.  When the single BFD session is used to mon=
itor
> the
   monitor the
> reachability of the remote VTEP, an implementation SHOULD 
   choose any =
of
> the VNIs but MAY  class=3D"delete">choose VNI =3D 0.
>    of the VNIs.  An
> implementation MAY support the use of the
> Management
  class=3D"rblock">   VNI as control and management
> channel between VTEPs.  The selection class=3D"lineno">
  class=3D"rblock">   of the VNI number of the Manag=
ement
> VNI MUST be controlled through
  class=3D"rblock">   management plane.  An implemen=
tation
> MAY use VNI number 1 as the
  class=3D"rblock">   default value for the Manageme=
nt
> VNI.  All VXLAN packets received on
  class=3D"rblock">   the Management VNI MUST be pro=
cessed
> locally and MUST NOT be
  class=3D"rblock">   forwarded to a
> tenant.
 
7.  Echo BFD
> 7.  Echo BFD
 
   Support for e=
cho
> BFD is outside the scope of this document.  class=3D"right">   Support for echo BFD is outside the scope of this
> document.
 
8.  IANA
> Considerations 8.  IANA
> Considerations
 
    class=3D"delete">IANA has assigned TBA as a
> dedicated MAC address from the IANA  class=3D"delete">48-bit     class=3D"insert">This specification has no<=
/span>
> IANA action requested.  This section may
> be
 class=3D"delete">   unicast MAC address registry to be  class=3D"delete">used as the Destination MAC  class=3D"rblock">   deleted before the  class=3D"insert">publication.
 class=3D"delete">   address of the inner Et=
hernet
> of VXLAN when carrying BFD control  class=3D"rblock">
 class=3D"delete">   packets.  class=3D"lineno">
 
9.  Security
> Considerations 9.  Security
> Considerations
 
   The document
> requires setting the inner IP TTL to 1, which could be  class=3D"right">   The document requires setting the inner IP TTL to 1, w=
hich
> could be
   used as a DDo=
S
> attack vector.  Thus the implementation MUST have  class=3D"right">   used as a DDoS attack vector.  Thus the implementation
> MUST have
   throttling =
in
> place to control the rate of BFD control
> packets sent    throttling in place to
> control the rate of BFD Control packets
> sent
   to the cont=
rol
> plane.  Throttling MAY be relaxed for BFD
> packets    to the control plane.   class=3D"insert">On the other hand, over-aggressive throttling class=3D"lineno">
    class=3D"delete">based on port number.  class=3D"rblock">   of BFD Control packets may bec=
ome
> the cause of the inability to form
  class=3D"rblock">   and maintain BFD session at sc=
ale.
> Hence, throttling of BFD Control class=3D"lineno">
  class=3D"rblock">   packets SHOULD be adjusted to =
permit
> BFD to work according to its
  class=3D"rblock">   procedures. class=3D"lineno">
 
    class=3D"delete">The implementation SHOULD  class=3D"delete">have a reasonable upper bo=
und
> on the number     class=3D"insert">If the implementation supp=
orts
> establishing multiple BFD sessions
   of  class=3D"delete">BFD sessions that can be c=
reated
> between the same pair of VTEPs.
>    between the same pair=
 of
> VTEPs, there SHOULD be a  class=3D"insert">mechanism to
  class=3D"rblock">   control the  class=3D"insert">maximum number of such
> sessions that can be active at the class=3D"lineno">
  class=3D"rblock">   same time. class=3D"lineno">
 
   Other than in=
ner
> IP TTL set to 1 and limit the number of BFD sessions  class=3D"right">   Other than inner IP TTL set to 1 and limit the number =
of
> BFD sessions
   between the s=
ame
> pair of VTEPs, this specification does not raise any  class=3D"right">   between the same pair of VTEPs, this specification doe=
s
> not raise any
   additional
> security issues beyond those of the specifications  class=3D"right">   additional security issues beyond those of the
> specifications
   referred to i=
n the
> list of normative references.    referr=
ed
> to in the list of normative references.
 
10.
> Contributors 10.  Contributors class=3D"lineno">
 
   Reshad
> Rahman    Reshad Rahman class=3D"lineno">
   rrahman@cisco=
.com
>    rrahman@cisco.com class=3D"lineno">
 
skipping t=
o
> change at https://www6.ietf.org/rfcdiff/rfcdiff.pyht#part-6"> page 10, line
> 14 =C2=B6 s=
kipping
> to change at https://www6.ietf.org/rfcdiff/rfcdiff.pyht#part-6"> page 10, line
> 33 =C2=B6
 
   [RFC8365]
> Sajassi, A., Ed., Drake, J., Ed., Bitar, N., Shekhar, R., 
              Ut=
taro,
> J., and W. Henderickx, "A Network Virtualization  class=3D"right">              Uttaro, J., and W. Henderickx, "A Network
> Virtualization
              Ov=
erlay
> Solution Using Ethernet VPN (EVPN)", RFC 8365,  class=3D"right">              Overlay Solution Using Ethernet VPN (EVPN)"=
,
> RFC 8365,
              DO=
I
> 10.17487/RFC8365, March 2018, 
> DOI 10.17487/RFC8365, March 2018,
              &l=
t;
> https://www.rfc-editor.org/info/rfc8365>.  class=3D"right">              <
> https://www.rfc-editor.org/info/rfc8365>. class=3D"lineno">
 
Authors'
> Addresses Authors' Addresses class=3D"lineno">
 
   Santosh Palla=
gatti
> (editor)    Santosh Pallagatti
> (editor)
    class=3D"delete">Rtbrick     class=3D"insert">VMware
 
   Email:
> santosh.pallagatti@gmail.com    Email:
> santosh.pallagatti@gmail.com
 
   Sudarsan
> Paragiri    Sudarsan Paragiri class=3D"lineno">
   Individual
> Contributor    Individual
> Contributor
 
   Email:
> sudarsan.225@gmail.com    Email:
> sudarsan.225@gmail.com
 
   Vengada Prasa=
d
> Govindan    Vengada Prasad Govindan class=3D"lineno">
   Cisco   Cisco
  class=3D"right">
 align=3D"center"> End of changes. 41 change blocks. 
76 lines changed or
> deleted 112 lines changed or
> added

This ht=
ml diff
> was produced by rfcdiff 1.47. The latest version is available from  http://www.tools.ietf.org/tools/rfcdiff/">
> http://tools.ietf.org/tools/rfcdiff/ 

> >
> >
> > 
>

--000000000000939187059626ff41
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Jeff,
thank you for your comments =
and suggestion. Please find my answers below in-lined under the GIM>>=
 tag.

Regards,
Greg

On Wed, Oct 30,=
 2019 at 1:27 PM Jeffrey Haas <jhaas@p=
frc.org> wrote:
Greg,



>From the updated text:



"At the same time, a service layer BFD session may be used between the=


tenants of VTEPs IP1 and IP2 to provide end-to-end fault management. In

such case, for VTEPs BFD Control packets of that session are

indistinguishable from data packets.=C2=A0 If end-to-end defect detection i=
s

realized as the set of concatenated OAM domains, e.g., VM1-1 - IP1 --

IP2 - VM2-1, then the BFD session over VXLAN between VTEPs SHOULD

follow the procedures described in Section 6.8.17 [RFC5880]."



In the case that two VMs are running BFD to each other as a user applicatio=
n

rather than as part of the virtualized environment, it's unlikely that<=
br>
they'd be treated as concatenated domains.=C2=A0 To do so, the tenant V=
Ms would

have to have a sense that they are indeed virtual.



Is your intent in this text that BFD implementations on the server should
detect BFD sessions between servers and change them to a concatenated

session? 
GIM>> No, we do not suggest that the c=
oncatenation of BFD sessions be automagical. That may be controlled via the=
 management plane though.



Section 5 comment:



:=C2=A0 =C2=A0The UDP destination port and the TTL of the inner IP packet M=
UST be

:=C2=A0 =C2=A0validated to determine if the received packet can be processe=
d by

:=C2=A0 =C2=A0BFD.=C2=A0 BFD Control packets with unknown MAC address MUST =
NOT be

:=C2=A0 =C2=A0forwarded to VMs.



I'd suggest pushing the second sentence into the prior section since it=


deals with MAC addresses rather than the UDP procedures.
GIM>> Could you please clarify your suggestion - move to Section 4=
 or to the preceding paragraph? I think it is the latter but wanted to make=
 sure.



-- Jeff





On Wed, Oct 30, 2019 at 01:06:23PM -0700, Greg Mirsky wrote:

> Dear All,

> thank you for your comments, suggestions that have made the discussion=
 the

> most helpful to the Editors. I've tried to reflect your comments i=
n the

> updates listed below:

> 

>=C2=A0 =C2=A0 - on the inner destination IP address:

> 

> OLD TEXT:

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Destination IP: IP address MUST NOT =
be of one of tenant's IP

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 addresses.=C2=A0 IP address MAY be s=
elected from the range 127/8 for

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 IPv4, for IPv6 - from the range 0:0:=
0:0:0:FFFF:7F00:0/104.

> NEW TEXT:

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Destination IP: IP address MUST NOT =
be of one of tenant's IP

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 addresses.=C2=A0 The IP address SHOU=
LD be selected from the range 127/8

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 for IPv4, for IPv6 - from the range =
0:0:0:0:0:FFFF:7F00:0/104.

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Alternatively, the destination IP ad=
dress MAY be set to VTEP's

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 IP address.

> 

>=C2=A0 =C2=A0 - firewall. Appended Section 3 Deployment with the follow=
ing paragraph:

> 

>=C2=A0 =C2=A0 As per Section 4, the inner destination IP address SHOULD=
 be set to

>=C2=A0 =C2=A0 one of the loopback addresses (127/8 range for IPv4 and
>=C2=A0 =C2=A0 0:0:0:0:0:FFFF:7F00:0/104 range for IPv6).=C2=A0 There co=
uld be a firewall

>=C2=A0 =C2=A0 configured on VTEP to block loopback addresses if set as =
the

>=C2=A0 =C2=A0 destination IP in the inner IP header.=C2=A0 It is RECOMM=
ENDED to allow

>=C2=A0 =C2=A0 addresses from the loopback range through a firewall only=
 if it is

>=C2=A0 =C2=A0 used as the destination IP address in the inner IP header=
, and the

>=C2=A0 =C2=A0 destination UDP port is set to 3784 [RFC5881].

> 

> Regarding the use of VNI 0 as the Management VNI. In Section 6 has bee=
n

> noted:

>=C2=A0 =C2=A0 An implementation MAY support the use of the Management
>=C2=A0 =C2=A0 VNI as control and management channel between VTEPs.=C2=
=A0 The selection

>=C2=A0 =C2=A0 of the VNI number of the Management VNI MUST be controlle=
d through

>=C2=A0 =C2=A0 management plane.=C2=A0 An implementation MAY use VNI num=
ber 1 as the

>=C2=A0 =C2=A0 default value for the Management VNI.

> 

> Attached, please find the updated working version and the diff to -07.=


> Editors much appreciate your comments, suggestions, abd help to have t=
he

> new version uploaded before the cut-off deadline.

> 

> Regards,

> Greg

> 

> On Wed, Oct 30, 2019 at 4:46 AM Dinesh Dutt <didutt@gmail.com> wrote:

> 

> >

> >

> > On Wed, Oct 30, 2019 at 11:40 AM, Anoop Ghanwani <anoop@alumni.duke.edu>=
;

> > wrote:

> >

> > Hi Dinesh,

> >

> > Your earlier comment was about silicon, that's why I discusse=
d only the

> > trapping issue.=C2=A0 As far as software goes, IP stacks would ty=
pically discard

> > packets received from a non-loopback interface if the packet'=
s address is

> > in 127/8.=C2=A0 I am not sure a traditional IP stack can play her=
e because even

> > on Tx, we have the same MAC for reaching all remote VTEPs.=C2=A0 =
It seems to me

> > the BFD module would have to be working directly with L2 frames c=
oming off

> > the tunnel.=C2=A0 Kind of like if we were running LLDP between th=
e VTEPs.

> >

> >

> > Hi Anoop,

> >

> > My earlier comment was indeed about silicon, but the packet has t=
o go

> > through the software stack as well once it gets to the CPU. Linux=
-based

> > solutions such as Linux servers or Cumulus Linux or maybe even SO=
NIC will

> > need to have a valid IP address to process the packet. Given that=
 127/8 is

> > already mandated by MPLS BFD, sticking with that is better than i=
gnoring

> > the IP address. This is why I agreed with Jeffrey Haas' comme=
nt about

> > SHOULD be set.

> >

> > Dinesh

> >

> >

> > Thanks,

> > Anoop

> >

> > On Tue, Oct 29, 2019 at 10:02 PM Dinesh Dutt <didutt@gmail.com> wrote:

> >

> >> Trapping to the CPU would be fine based on MAC DA. But once t=
here, a

> >> self-respecting network stack would look at the IP header to =
decide what to

> >> do. Ignoring it on receive may not be an option,

> >>

> >> Dinesh

> >> On Oct 30, 2019, 10:26 AM +0530, Anoop Ghanwani <anoop@alumni.duke.edu>,

> >> wrote:

> >>

> >> Hi Dinesh,

> >>

> >> What would break?=C2=A0 If messages are trapped to CPU based =
on the MAC DA,

> >> what is the problem?

> >>

> >> On the flip side, there are implementations running BFD today=
 which use

> >> different addresses as specified here:

> >> http://www.openvswitch.org/sup=
port/dist-docs/vtep.5.html

> >> >>>

> >>

> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 *b**f**d**_**c**o**n**f**i**g**_**=
l**o**c**a**l* *:* *b**f**d**_**d**s**t**_**i**p*: optional string

> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Set to =
an IPv4 address to set the IP address that is expected as

> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0destina=
tion=C2=A0 =C2=A0for=C2=A0 =C2=A0received=C2=A0 =C2=A0BFD=C2=A0 =C2=A0packe=
ts.=C2=A0 =C2=A0The=C2=A0 default=C2=A0 is

> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*1**6**=
9**.**2**5**4**.**1**.**0*.

> >>

> >> >>>

> >>

> >> Thanks,

> >> Anoop

> >>

> >> On Tue, Oct 29, 2019 at 7:01 PM Dinesh Dutt <didutt@gmail.com> wrote:
> >>

> >>> I suspect silicon implementations will have a problem wit=
h saying that

> >>> they can be set to anything and MUST be ignored on recept=
ion. Your logic is

> >>> sound, it's just that I fear you'll break many ex=
isting implementations. I

> >>> recommend sticking with the 127/8 address for this case.<=
br>
> >>>

> >>> Dinesh

> >>>

> >>> On Tue, Oct 29, 2019 at 9:15 PM, Joel M. Halpern <jmh@joelhalpern.com>

> >>> wrote:

> >>>

> >>> In all the discussion about what VNI to use and multiple =
VNI support, I

> >>> lsot track. Sorry. Still, the earlier documents did not s=
pecify the IP to

> >>> use. That does NOT mean that we are required in later rev=
isions of the

> >>> document to allow anything the client wants. Having said =
that, we could add

> >>> text saying that since the IP address in the BFD request =
in VNI 0 is

> >>> effectively meaningless, it can be set to any value on tr=
ansmission and

> >>> must be ignored on reception. As far as I can tell, it is=
 definitional that

> >>> the VtEP does not have any assigned IP address for VNI 0,=
 so we can't

> >>> expect that address. Yours, Joel On 10/29/2019 11:10 AM, =
Anoop Ghanwani

> >>> wrote:

> >>>

> >>> Hi Joel, Yes, existing implementations use VNI 0 for BFD =
over VXLAN.

> >>> Here are a couple of references:

> >>> https://www.juniper.net/documentation/en_US/junos/topics/concept/sdn-o=
vsdb-bfd-nsx.html

> >>> https://www.cisco.com/c/en/us/p=
roducts/collateral/switches/nexus-9000-series-switches/white-paper-c11-7400=
91.html#_Toc18013665

> >>> I guess this document has been evolving and I have not ke=
pt up with it. The

> >>> version I had reviewed and commented on originally allowe=
d for VNI 0.=C2=A0 The

> >>> -04 version of the draft has this:

> >>> https://tools.ietf.or=
g/html/draft-ietf-bfd-vxlan-04#section-7 What

> >>> version are you referring to? Thanks, Anoop On Mon, Oct 2=
8, 2019 at 12:55

> >>> PM Joel M. Halpern <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com

> >>> <jmh@joelhalpern.com>>> wrote: You are saying that there ar=
e existing

> >>> implementations using VNI 0 for this?=C2=A0 Given that pr=
evious versions of the

> >>> spec explicitly disallowed VNI 0, I am having trouble wit=
h your objecting

> >>> that a spec for how to run over VNI 0 breask existing imp=
lementations. Note

> >>> that when there is a good technical reason, the IETF does=
 change Internet

> >>> Drafts in ways that break early implementations.=C2=A0 Th=
at is the price of

> >>> standardization. Yours, Joel On 10/28/2019 2:30 PM, Anoop=
 Ghanwani wrote: >

> >>> Hi Joel, > > Writing the spec in that way would mak=
e the current,

> >>> inter-operable > implementation of multiple vendors no=
n-compliant with the

> >>> spec. > > Thanks, > Anoop > > On Mon, Oct =
28, 2019 at 11:07 AM Joel M.

> >>> Halpern <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com

> >>> <jmh@joelhalpern.com>> > <mailto:jmh@joelhalpern.com

> >>> <jmh@joelhalpern.com> <mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>>><=
br>
> >>> wrote: > >=C2=A0 =C2=A0 =C2=A0I assumed this was on=
ly for the case where a tenant VNI was

> >>> being used. > >=C2=A0 =C2=A0 =C2=A0For the 0 VNI (w=
hich is what I prefer), always (MUST)

> >>> use the loopback >=C2=A0 =C2=A0 =C2=A0address.=C2=A0 T=
here are no addresses assigned to the

> >>> VTEP in that space. >=C2=A0 =C2=A0 =C2=A0There is no I=
RB in that space. > >=C2=A0 =C2=A0 =C2=A0Yours, >

> >>>=C2=A0 =C2=A0 Joel > >=C2=A0 =C2=A0 =C2=A0On 10/28/2=
019 1:58 PM, Anoop Ghanwani wrote: >=C2=A0 =C2=A0 =C2=A0 > Joel,

> >>> >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 &g=
t; Are we going to qualify this by VNI?=C2=A0 There's a bunch of

> >>> >=C2=A0 =C2=A0 =C2=A0implementations >=C2=A0 =C2=A0=
 =C2=A0 > out there that don't use a tenant IP or a

> >>> loopback with VNI 0--they >=C2=A0 =C2=A0 =C2=A0 > s=
imply repeat the underlay IP in the

> >>> inner IPDA. >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=
=A0 =C2=A0 > Thanks, >=C2=A0 =C2=A0 =C2=A0 > Anoop >=C2=A0 =C2=
=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 > On

> >>> Mon, Oct 28, 2019 at 10:46 AM Joel M. Halpern >=C2=A0 =
=C2=A0 =C2=A0<j=
mh@joelhalpern.com

> >>> <mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>> >=C2=A0 =C2=A0 =C2=
=A0 > <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>>>> wrote: >=C2=
=A0 =C2=A0 =C2=A0 > >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0I can live wit=
h saying that you SHOULD use loopback, and MAY >

> >>>=C2=A0 instead >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0use >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0an IP address in=
 the customer space

> >>> known to be owned by the VTEP >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0device >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0when such

> >>> exists. >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0Yours, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0Joel >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 &g=
t;

> >>>=C2=A0 On 10/28/2019 1:32 PM, Anoop Ghanwani wrote: >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Hi Joel, >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Perhaps we need to say use of an a=
ddress owned

> >>> by the device >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0containing >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > the=
 VTEP. >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 > Or are you suggesting that the use of the loopback

> >>> address >=C2=A0 =C2=A0 =C2=A0space >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0is a MUST? >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;

> >>> Anoop >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt; >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > On Mon, Oct 28, =
2019 at 10:22 AM Joel

> >>> M. Halpern >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0<jmh@joelhal=
pern.com <mailto:jmh@joelhalpern.com

> >>> <jmh@joelhalpern.com>> <mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>

> >>> <mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>> >=C2=A0 =C2=A0=
 =C2=A0<

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>>> >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 > <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>>>>> wrote: >=
;=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0> >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0There is something I am missing i=
n your

> >>> assumption >=C2=A0 =C2=A0 =C2=A0about IRB. >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0As I

> >>> understand VxLAN, the VTEP is under the control >=C2=
=A0 =C2=A0 =C2=A0of the >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 operator. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0As such, it is a pure bridge.=C2=A0 If y=
ou run

> >>> IRB behind >=C2=A0 =C2=A0 =C2=A0it, that >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0is fine. >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Yes, an

> >>> operator may offer IRB.=C2=A0 But as I understand it, >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0conceptually,

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0in terms of the VxLAN architecture the IRB is an entity
> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0behind t=
he >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0VTEP, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0not

> >>> part of the VTEP. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0Yours, >=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0Joel >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0On 10/28/2019 12:23 PM,

> >>> Anoop Ghanwani wrote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Santosh, >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>> > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 > Does it have to be a MUST?=C2=A0 What if I am r=
unning

> >>> >=C2=A0 =C2=A0 =C2=A0IRB and there >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0are IP >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>> addresses per VNI assigned to the VTEPs? Why can the >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0operator

> >>> not >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 > choose to use those? >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 > Anoop >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 > On

> >>> Mon, Oct 28, 2019 at 7:51 AM Santosh P K >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > <

> >>> santosh.pallagatti@gmail.com <mailto:santosh.pallagatti@gmail.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pall=
agatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>>>

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pall=
agatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>>>>

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pall=
agatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>>>

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pall=
agatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>>>>>>

> >>> wrote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Dinesh, Anoop et
> >>> all, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lets us=
 know if this text works for

> >>> 127/8 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0ad=
dress range? >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0[proposed text for fi=
rewall] >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0"As=
 per section 4 inner destination IP address >=C2=A0 =C2=A0 =C2=A0MUST be=


> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0set to &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A012=
7/8 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >

> >>>=C2=A0 address. There may be firewall configured on >=
=C2=A0 =C2=A0 =C2=A0VTEP to >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 block 127/8 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0address range i=
f set as destination

> >>> IP in inner IP >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0header. It is >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 recommended to allow 127/8 range address through &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0firewall

> >>> only if >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0127/8 IP address is set a=
s destination

> >>> address >=C2=A0 =C2=A0 =C2=A0in inner IP >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0header."=
; >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>> > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0In section 4 we are
> >>> talking about using 127/8 >=C2=A0 =C2=A0 =C2=A0and not=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0really >=C2=A0 =C2=A0 =
=C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0giving >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0re=
ason why. I think we should have

> >>> text as RFC 5884 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0has mentioned >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0with

> >>> below text. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0[From RFC
> >>> 5884] >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0"The motivation for us=
ing the address

> >>> range >=C2=A0 =C2=A0 =C2=A0127/8 is >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0the same as >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 specified in Section 2.1 of [RFC4379] >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
<

> >>> https://tools.ietf.org/html/rfc4379=
#section-2.1>. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0This=
 is

> >>> an >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0exception to the behavior defi=
ned in [RFC1122

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<https://tools.ietf.=
org/html/rfc1122>]." >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0Thanks >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Santosh P K >=C2=A0 =C2=A0 =
=C2=A0 >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0On Thu, Oct 24, 2019 =
at 1:24 AM Dinesh Dutt >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<=
;

> >>> did=
utt@gmail.com <mailto:didutt@gmail.com <didutt@gmail.com>> <

> >>> mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>>> >=C2=A0 =C2=A0 =C2=A0<mailto:didutt@gmail.com <didutt@gmail.com>=
; <

> >>> mailto:didutt@gmail.com <didutt@gmail.com>> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com> <mailto:didutt@gmail.com <didutt@gmail.com>>>> >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0<mailto:didu=
tt@gmail.com <=
didutt@gmail.com> <

> >>> mailto:didutt@gmail.com <didutt@gmail.com>> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com> <mailto:didutt@gmail.com <didutt@gmail.com>>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>> <mailto:didutt@gmail.com <didutt@gmail.com> <

> >>> mailto:didutt@gmail.com <didutt@gmail.com>>>>> >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 <mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>> >=C2=A0 =C2=A0 =C2=A0<mailto:didutt@gmail.com <didutt@gmail.com> &l=
t;

> >>> mailto:didutt@gmail.com <didutt@gmail.com>>> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com> <mailto:didutt@gmail.com <didutt@gmail.com>> >=C2=A0 =C2=A0 =C2=A0&l=
t;

> >>> mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0<mailto:didutt@gmail.com

> >>> <didutt@gmail.com> <mailto:didutt@gmail.com <didutt@gmail.com>> <

> >>> mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>>> >=C2=A0 =C2=A0 =C2=A0<mailto:didutt@gmail.com <didutt@gmail.com>=
; <

> >>> mailto:didutt@gmail.com <didutt@gmail.com>> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com> <mailto:didutt@gmail.com <didutt@gmail.com>>>>>>>

> >>> wrote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Looks=
 good to

> >>> me Greg. I see that the text >=C2=A0 =C2=A0 =C2=A0arou=
nd >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0the use >=C2=A0 =C2=
=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0of the >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0inner IP address as also

> >>> quite acceptable. Will >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0you add any >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 words about the firewall? >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 Dinesh >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0On Wed,

> >>> Oct 23, 2019 at 8:36 PM, Greg Mirsky >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0<

> >>> gregimirsky@gmail.com <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =C2=A0<mailto:=
gregimirsky@gmai=
l.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>>>> >=C2=A0 =C2=A0 =C2=A0<=
;mailto:gregimir=
sky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>>>>> >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>>> >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>> >=C2=A0 =C2=
=A0 =C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>>>>>>=
; wrote: >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Dinesh, et al., >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;

> >>>=C2=A0 =C2=A0 please check the updated version that >=
=C2=A0 =C2=A0 =C2=A0removed the >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >

> >>>=C2=A0 =C2=A0 reference to >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0Hypervisor in the text and

> >>> Figure 1. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Regards,

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Greg >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> &=
gt;=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0On Wed, Oct 23, 2019 at 10:47 AM Santosh P K >=C2=A0 =C2=A0 =
=C2=A0 >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0<santosh.pallagatti@gmail.com <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>> >

> >>>=C2=A0 =C2=A0 <mailto:santosh.pallagatti@gmail.com <santosh.pallag=
atti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pall=
agatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>>>

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pall=
agatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>>>>

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>=C2=A0 <mailto:santosh.pallagatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pall=
agatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>>>

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0<mailto:santosh.pallagatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0<mailto:santosh.pall=
agatti@gmail.com

> >>> <santosh.pallagatti@gmail.com> <mailto:santosh.pallagatti@gmai=
l.com

> >>> <santosh.pallagatti@gmail.com>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com> <

> >>> mailto:santosh.pallagatti@gmail.com <santosh.pallagatti@gmail.com>>>>>>>

> >>> wrote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0Dinesh,

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 Please see my inline comments

> >>> [SPK] >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >

> >>> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0- In section 3, there's a sentence >=C2=A0 =C2=A0 =C2=
=A0that >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 is: "BFD >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0packets intended for a

> >>> Hypervisor >=C2=A0 =C2=A0 =C2=A0VTEP MUST >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0NOT..".=
 I >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0recommend getting rid of the word >=C2=A0 =C2=
=A0 =C2=A0 >

> >>>=C2=A0 "Hypervisor" ashe >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0logic applies to

> >>> any VTEP. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0[SPK]

> >>> Thanks for comments. We will >=C2=A0 =C2=A0 =C2=A0chan=
ge this. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0- You already explained the >

> >>>=C2=A0 precedence of >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0the use of >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >>

> >>>=C2=A0 =C2=A0 127/8 address in the inner header in >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0MPLS. I have no >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0specific com=
ments in that area. I have >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0only two >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0questions=
: >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 - Has anybody verified that the >

> >>>=C2=A0 use of >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0127/8 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0address

> >>> (and the right MAC) works with >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0existing >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >

> >>> >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0implementations, including the silicon >=C2=A0 =C2=A0 =C2=
=A0 >

> >>>=C2=A0 ones? If this >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0doesn't work there,

> >>> is it worth >=C2=A0 =C2=A0 =C2=A0adding the >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0possibilit =
>=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0y of another address, one that is >=
;=C2=A0 =C2=A0 =C2=A0owned >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0by the >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0VTEP nod=
e? >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 - Do we know if Firewalls stop >

> >>>=C2=A0 such VXLAN >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0packets? >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>

> >>>=C2=A0 =C2=A0 =C2=A0 I ask this because VXLAN has an IP &g=
t;=C2=A0 =C2=A0 =C2=A0header >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0and I >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0don't >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0know if

> >>> firewalls stop packets >=C2=A0 =C2=A0 =C2=A0with 127/8=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0in the >=C2=A0 =C2=A0 =
=C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0inner >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0header. If not, is it

> >>> worth adding a >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0sentence to say >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 that firewalls=C2=A0 al=
low such >=C2=A0 =C2=A0 =C2=A0packets? The >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0use of

> >>> a >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0non-127/8 address may alleviate

> >>> >=C2=A0 =C2=A0 =C2=A0this case >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0as well. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 &g=
t;

> >>> >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0[SPK] I think we may need to add the text >=C2=
=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 about firewall >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0as some checks in

> >>> firewall will be >=C2=A0 =C2=A0 =C2=A0there if >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0they are not >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0already using MPLS OAM which has inner IP >=C2=A0 =
=C2=A0 =C2=A0 >

> >>>=C2=A0 header with >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0127/8 address range. >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 The rest of the draft looks go=
od >=C2=A0 =C2=A0 =C2=A0to me, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >

> >>> >> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0Dinesh >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0On Wed, Oct 23, 2019 at 7:58 AM, >

> >>>=C2=A0 =C2=A0 Greg Mirsky >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<

> >>> gregimirsky@gmail.com <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =C2=A0<mailto:=
gregimirsky@gmai=
l.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>>>> >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>>>> >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>> >=C2=A0 =C2=
=A0 =C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>>> >=C2=A0=
 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>>>>>>=
; >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0wrote: >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>
> >>>=C2=A0 Hi Dinesh, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I greatly appreciate

> >>> your comments. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0Please heave a >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 look at the attached co=
py of the >=C2=A0 =C2=A0 =C2=A0working >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 version and >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0its diff to -07

> >>> (latest in the >=C2=A0 =C2=A0 =C2=A0datatracker). >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
>> >=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Regards, >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>

> >>>=C2=A0 Greg >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On

> >>> Tue, Oct 22, 2019 at 9:52 PM >=C2=A0 =C2=A0 =C2=A0Dine=
sh Dutt >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <didutt@gmail.com <m=
ailto:didutt@gmail.co=
m

> >>> <didutt@gmail.com>> >=C2=A0 =C2=A0 =C2=A0<mailto:didutt@gmail.com <didutt@gmail.com> &l=
t;

> >>> mailto:didutt@gmail.com <didutt@gmail.com>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0<

> >>> mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>> <mailto:didutt@gmail.com <didutt@gmail.com> <

> >>> mailto:didutt@gmail.com <didutt@gmail.com>>>> >=C2=A0 =C2=A0 =C2=A0<
> >>> mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>> <mailto:didutt@gmail.com <didutt@gmail.com> <

> >>> mailto:didutt@gmail.com <didutt@gmail.com>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0<

> >>> mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>> <mailto:didutt@gmail.com <didutt@gmail.com> <

> >>> mailto:didutt@gmail.com <didutt@gmail.com>>>>> >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>> <mailto:didutt@gmail.com <didutt@gmail.com> <

> >>> mailto:didutt@gmail.com <didutt@gmail.com>>> >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>> <mailto:didutt@gmail.com <didutt@gmail.com> <

> >>> mailto:didutt@gmail.com <didutt@gmail.com>>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>> <mailto:didutt@gmail.com <didutt@gmail.com> <

> >>> mailto:didutt@gmail.com <didutt@gmail.com>>> >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:didutt@gmail.com <didutt@gmail.com> <mailto:didutt@gmail.com

> >>> <didutt@gmail.com>> <mailto:didutt@gmail.com <didutt@gmail.com> <

> >>> mailto:didutt@gmail.com <didutt@gmail.com>>>>>>> wrote: >=C2=A0 =
=C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I hav=
e the same

> >>> feeling as Anoop. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0Greg, can you >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pl=
ease point me to the latest >=C2=A0 =C2=A0 =C2=A0draft >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0so

> >>> that >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0I can >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >>>

> >>>=C2=A0 quickly glance through it to be >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0doubly sure, >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>>> >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Dinesh >=
=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On We=
d, Oct 23,

> >>> 2019 at 4:35 AM, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0Anoop Ghanwani >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 >>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &l=
t;anoop@alumni.d=
uke.edu <mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu>> >=C2=A0 =C2=A0 =C2=A0<mailto:=
anoop@alumni.duk=
e.edu

> >>> <anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0<mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu>> <mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu>>>> >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>>>> >=
=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>=C2=A0 <mailto:anoop@alumni.duke.=
edu <anoo=
p@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>> >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>>> >=C2=A0=
 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0<mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>> >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>>>>>>=
; wrote: >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0Greg, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I think the draft is fine as is.

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I

> >>> discussion with Xiao Min was >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0about #3 and I >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0see that as unnecessary unt=
il we >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 have a draft >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0that explains

> >>> why that is >=C2=A0 =C2=A0 =C2=A0needed in the >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0context =
>=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0of the NVO3 a=
rchitecture. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>>>> >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0An=
oop >=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>> >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>&g=
t;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0On Tue, Oct 22,

> >>> 2019 at 11:17 AM >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0Greg Mirsky >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 <

> >>> gregimirsky@gmail.com <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =C2=A0<mailto:=
gregimirsky@gmai=
l.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>>>> >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>>>> >=
=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>> >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0<mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com> <mailto:gregimirsky@gmail.com

> >>> <gregimirsky@gmail.com>>>> >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>> >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com> <

> >>> mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>>>>>>>=
; wrote: >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi

> >>> Anoop, et al., >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I agree
> >>> with your >=C2=A0 =C2=A0 =C2=A0understanding >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0of what is >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0being defined in the curre=
nt >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 version >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0of the >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 BFD over VxLAN &=
gt;=C2=A0 =C2=A0 =C2=A0specification. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0But, as I >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0understand, the WG is >

> >>> >=C2=A0 =C2=A0 =C2=A0discussing the scope >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>=
;>

> >>>=C2=A0 before the WGLC is closed. I >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0believe there >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0are three opt=
ions: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >>>>

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 1. single BFD session >=
;

> >>>=C2=A0 =C2=A0 between >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0two VTEPs >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A02. single BFD ses=
sion >=C2=A0 =C2=A0 =C2=A0per VNI >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0between >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0two VTEP=
s >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >>>>

> >>> 3. multiple BFD >=C2=A0 =C2=A0 =C2=A0sessions per >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0VNI between >=C2=A0 =C2=A0 =
=C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0two VTEPs >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The current text >

> >>>=C2=A0 reflects #2. Is WG >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0accepts >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 this scope? If not, which >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0option WG

> >>> would >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0accept? >=C2=A0 =
=C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>>> >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0Regards, >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Greg >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 >

> >>> >>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On Tue=
, Oct 22, 2019

> >>> at >=C2=A0 =C2=A0 =C2=A02:09 PM >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0Anoop >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Ghanwani >=C2=
=A0 =C2=A0 =C2=A0<anoop@alumni.duke.edu <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>> >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>>> >=C2=A0=
 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0<mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>>>> >=
=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>> >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0<mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu>> <mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0<mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu>> <mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu> <mailto:anoop@alumni.duke.edu

> >>> <anoop@alumni.duke.edu>>>> >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>> >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>> >=C2=A0 =C2=A0 =
=C2=A0<

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu> <

> >>> mailto:anoop@alumni.duke.edu <anoop@alumni.duke.edu>>>>>>>=
; wrote: >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 I concur with Joel's >=C2=A0 =C2=A0 =C2=A0as=
sessment >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0with the >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0following >

> >>>=C2=A0 clarifications. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>> >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>
> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 The current document >=C2=A0 =C2=A0 =C2=A0is alread=
y >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 capable >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0of

> >>> monitoring >=C2=A0 =C2=A0 =C2=A0multiple VNIs >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0between =
VTEPs. >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>>&=
gt; >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The

> >>> issue under >=C2=A0 =C2=A0 =C2=A0discussion >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0was how >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0do we

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0use BFD to m=
onitor >

> >>>=C2=A0 =C2=A0 multiple >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0VAPs that >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 use the s=
ame VNI >=C2=A0 =C2=A0 =C2=A0between a >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0pair of >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0VTEPs.=C2=A0 The use case for >
> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0this is not &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;>>>

> >>>=C2=A0 clear to me, as from my >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0understanding, >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >

> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0we cannot ha=
ve a >=C2=A0 =C2=A0 =C2=A0situation with >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0multiple >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 VAPs using the same >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0VNI--there is 1:1 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >

> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mapping betw=
een VAP >=C2=A0 =C2=A0 =C2=A0and VNI. >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >>>>

> >>>=C2=A0 Anoop >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>> >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 On Tue, Oct 22, =
2019 >=C2=A0 =C2=A0 =C2=A0at 6:06 AM >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Joel

> >>> M. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Halpern &=
gt;=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com

> >>> <jmh@joelhalpern.com>> <mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>

> >>> <mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>> >=C2=A0 =C2=A0=
 =C2=A0<

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>>> >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 <mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> >=C2=A0 =C2=A0 =C2=A0&l=
t;

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> >=C2=A0 =C2=A0 =C2=A0&l=
t;

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>>>> >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0>>>> >=C2=A0 =C2=A0 =C2=A0 =C2=
=A0<mailto:jmh@=
joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>> >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>>> >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 <mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> >=C2=A0 =C2=A0 =C2=A0&l=
t;

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>> >=C2=A0 =C2=A0 =C2=A0&l=
t;

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com> <

> >>> mailto:jmh@joelhalpern.com <jmh@joelhalpern.com>>>>>>> >=
=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 wrote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>> >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0From what I can >=C2=A0 =C2=A0 =C2=A0tell, >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0there >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0are two >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
>>>

> >>>=C2=A0 separate problems. >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 The document we >=C2=A0 =C2=A0 =C2=A0have=
 is a >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0VTEP-VTEP >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>>&=
gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0monitoring >=C2=A0 =C2=
=A0 =C2=A0document.

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0There is=
 no >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 need for that >=C2=A0 =C2=
=A0 =C2=A0document to >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0handle the >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0multiple =
VNI case. >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0If=
 folks want a >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0protocol for doing &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 BFD monitoring >=C2=
=A0 =C2=A0 =C2=A0of things >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0behind the >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0VTEPs (mu=
ltiple >

> >>>=C2=A0 VNIs), >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0then do >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0that >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
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>>>>

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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &g=
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > On Thu, Oct >=
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> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
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530, Santosh P >

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> >>>=C2=A0 Thanks >=C2=A0 =C2=A0 =C2=A0for your >=C2=A0 =
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> >>>=C2=A0 would wait >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
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that

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> >>> appropriate >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
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> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
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> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>>&=
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> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0where it=
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 challenging >=C2=A0 =C2=A0 =
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> >>>=C2=A0 > to follow what the >=C2=A0 =C2=A0 =C2=A0 &g=
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 > However, if I've >=
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>

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> >>>=C2=A0 really the >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
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> >>> hinge point on >=C2=A0 =C2=A0 =C2=A0what our >=C2=
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;>>

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> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>>&=
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> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>>&=
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> >>>=C2=A0 =C2=A0 =C2=A0>>>>=C2=A0 =C2=A0 =C2=A0 =
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Essentially, >=C2=A0 =C2=A0 =C2=
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> >>> not >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
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> >>> >=C2=A0 =C2=A0 =C2=A0ability to >=C2=A0 =C2=A0 =C2=
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &g=
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> >>> >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > If this is so, >=
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have

> >>> a >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 as to how we sho=
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> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
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> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
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=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>

> >>> [context preserved >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0below...] >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >> Santosh P K &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 >> >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>> On

> >>> Wed, Sep >=C2=A0 =C2=A0 =C2=A025, 2019 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0at 8:10 AM >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>> >=C2=A0 =C2=A0 =C2=A0 =C2=A0<xiao.min2@zte.com.cn <mailto:xiao.min2@zte.com.cn=


> >>> <xiao.min2@zte.com.cn>> <mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0<mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn>> <mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn>>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn> <

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn> <

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn>>> <

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn> <

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn> <

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn>>>>> >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>>>> >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn>> <mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn>>> >=C2=A0 =C2=A0 =C2=A0<mailt=
o:xiao.min2@zte.c=
om.cn

> >>> <xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn>> <mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn> <mailto:xiao.min2@zte.com.cn

> >>> <xiao.min2@zte.com.cn>>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn> <

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn> <

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn>>> <

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn> <

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn>> >=C2=A0 =C2=A0 =C2=
=A0<

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn> <

> >>> mailto:xiao.min2@zte.com.cn <xiao.min2@zte.com.cn>>>>>>> &g=
t;=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 wrote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0>> >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>> Hi Santosh=
, >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>> >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> With regard >=C2=A0 =C2=A0 =C2=
=A0to the >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0question

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0whether we >

> >>>=C2=A0 should allow >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0multiple BFD >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 sessions >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>><=
br>
> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 >>> for the same >=C2=A0 =C2=A0 =C2=A0VNI =
or >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0not, >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0IMHO we =
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>>>>

> >>>=C2=A0 =C2=A0 should allow it, >=C2=A0 =C2=A0 =C2=A0mor=
e >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0explanation as >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>>&=
gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>> follows. >=
=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> Below =
is a >=C2=A0 =C2=A0 =C2=A0figure >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 derived from >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 figure 2 of >=C2=A0 =C2=A0 =C2=A0RFC8014 (An >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Arch=
itecture for >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>> Data-Cente=
r >

> >>>=C2=A0 Network >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 Virtualization >=
=C2=A0 =C2=A0 =C2=A0over Layer 3 >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0(NVO3)). >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>> >

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>>

> >>>=C2=A0 =C2=A0Data Center Network >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0(IP)=C2=A0 =C2=A0 =C2=A0 =C2=A0 | >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>><=
br>
> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >

> >>> >>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 +-----------------------------------------+ >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>> >>>> >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0| >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >>>>

> >>>=C2=A0 >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tunnel Ove=
rlay >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>> >

> >>>=C2=A0 +------------+---------+ >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>> >

> >>>=C2=A0 =C2=A0+---------+------------+ >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>
> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >>>> >

> >>>=C2=A0 +----------+-------+ | >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>> >

> >>>=C2=A0 =C2=A0 +-------+----------+ | >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0=
 =C2=A0 =C2=A0| | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Overlay =
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Module=C2=A0 | | >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0| | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Overl=
ay >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Mo=
dule=C2=A0 | | >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>>&=
gt; >=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+--------+ | >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>> >=C2=A0 =C2=A0 =C2=A0 =C2=A0+---------+--------+ | >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|=C2=A0 =C2=A0 | >

> >>>=C2=A0 =C2=A0 =C2=A0 | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>
> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 >>>=C2=A0 NVE1=C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >

> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 | >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 | >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
>>>

> >>>=C2=A0 NVE2 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0>>>

> >>> | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 >>>> >=C2=A0 =C2=A0 =C2=A0 =C2=A0+-----=
---+-------+=C2=A0 | >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >>>> >=C2=A0 =C2=A0 =C2=A0 =C2=A0+=
--------+-------+=C2=A0 | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >

> >>>=C2=A0 =C2=A0 =C2=A0>>>>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0>>> >=C2=A0 =C2=A0 =C2=A0|=C2=A0 |VNI1 =
>=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0VNI2=C2=A0 VNI1 >=C2=A0 =C2=A0=
 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>><=
br>
> >>>=C2=A0 |=C2=A0 |=C2=A0 |=C2=A0 | VNI1 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0VNI2 VNI1 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0|=C2=A0 | >=C2=A0 =C2=A0 =C2=
=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>>&=
gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>> >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0+-+-----+----+---+=C2=A0 | >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >
> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>>> >=
;=C2=A0 =C2=A0 =C2=A0 =C2=A0+-+-----+-----+--+=C2=A0 | >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>
> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0 =C2=A0 =
=C2=A0|VAP1| >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0VAP2|=C2=A0 =
=C2=A0 | >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0VAP3 | >=C2=A0 =C2=
=A0 =C2=A0 =C2=A0|VAP1|

> >>> VAP2| >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0| VAP3| >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >>>> >

> >>>=C2=A0 +----+-----+----+------+ >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>> >

> >>>=C2=A0 =C2=A0+----+-----+-----+-----+ >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>
> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0| >=
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=A0 | >=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0|=
=C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
;=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =
=C2=A0| >=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0| >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 | >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0|

> >>>=C2=A0 | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=
 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0>>> >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >>>&=
gt; >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >

> >>>=C2=A0 -------+-----+----+-------------------+-----+-----+=
------- >=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>> >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0| >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>>=C2=A0 Tenant=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
| >=C2=A0 =C2=A0 =C2=A0 >

> >>>=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0| >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>> >

> >>>=C2=A0 =C2=A0 TSI1 | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0TSI2|=C2=A0 =C2=A0 | >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 TSI3 >=C2=A0 =C2=A0 =C2=A0TSI1| TSI2| >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0|TSI3 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>> >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0+---+

> >>> +---+ >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &=
gt;=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0+---+ >

> >>>=C2=A0 =C2=A0 +---+ >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0+---+ >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
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 =C2=A0 >

> >>>=C2=A0 =C2=A0>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0|TS1| |TS2| >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=
;>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|TS3| >=C2=A0 =C2=A0=
 =C2=A0 =C2=A0|TS4| >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0|TS5| >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0|TS6| &g=
t;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0+---+ +---+ >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >

> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0+---+ >=C2=A0 =C2=A0 =C2=A0 =C2=A0+---+ >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0+---+

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 =C2=A0+---+ >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=
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;>>>

> >>>=C2=A0 >>> To my >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0understanding, the BFD >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 sessions between >=C2=
=A0 =C2=A0 =C2=A0NVE1 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0and<=
br>
> >>> NVE2 are >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
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> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0>>> initiated and

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0terminat=
ed >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0at VAP >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0of NVE. >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>> >=C2=A0 =C2=A0 =
=C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>
> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >>&=
gt; If the >=C2=A0 =C2=A0 =C2=A0network operator >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0want to

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0set up one BFD >

> >>>=C2=A0 =C2=A0 session >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0between >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=
=C2=A0 =C2=A0 =C2=A0VAP1 of >=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>>> NVE1 and VAP1of >=C2=A0 =C2=
=A0 =C2=A0 >

> >>>=C2=A0 NVE2, at the >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 same time >=C2=A0 =C2=A0 =C2=A0another BFD >=
=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0session >=C2=A0 =C2=A0 =C2=
=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0between VAP3 of >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0>>> NVE1 and >=C2=A0 =C2=A0 =C2=A0VAP3 of NVE2, >

> >>>=C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0although >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >>>>

> >>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 the two BFD sessions >=C2=
=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0are for >=C2=A0 =C2=A0 =C2=A0 =
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0the

> >>> same >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 &g=
t;=C2=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0>>> VNI1, I

> >>> >=C2=A0 =C2=A0 =C2=A0believe it's >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0reasonable, >=
;=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >

> >>> >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0so that's why I >=C2=A0 =C2=A0 =C2=A0think we >

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0should a=
llow it >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=
 =C2=A0 >>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =
>

> >>> >>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=
=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0_________________________________=
______________

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0nvo3 mailing list

> >>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0 >>>> nvo3@ietf.org <mailto:nvo3@ietf.org

> >>> <nv=
o3@ietf.org>> <mailto:nvo3@ietf.org <nvo3@ietf.org> <

> >>> mailto:nvo3@ietf.org <n=
vo3@ietf.org>>> >=C2=A0 =C2=A0 =C2=A0<mailto:nvo3@ietf.org

> >>> <nv=
o3@ietf.org> <mailto:nvo3@ietf.org <nvo3@ietf.org>> <

> >>> mailto:nvo3@ietf.org <n=
vo3@ietf.org> <mailto:nvo3@ietf.org

> >>> <nv=
o3@ietf.org>>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0<mailto:nvo3@ie=
tf.org <nvo3@ietf=
.org> <

> >>> mailto:nvo3@ietf.org <n=
vo3@ietf.org>> <mailto:nvo3@ietf.org

> >>> <nv=
o3@ietf.org> <mailto:nvo3@ietf.org <nvo3@ietf.org>>> >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:nvo3@ietf.org <n=
vo3@ietf.org> <mailto:nvo3@ietf.org

> >>> <nv=
o3@ietf.org>> <mailto:nvo3@ietf.org <nvo3@ietf.org> <

> >>> mailto:nvo3@ietf.org <n=
vo3@ietf.org>>>>> <mailto:nvo3@ietf.org

> >>> <nv=
o3@ietf.org> <mailto:nvo3@ietf.org <nvo3@ietf.org>> >=C2=A0 =C2=A0 =C2=A0<

> >>> mailto:nvo3@ietf.org <n=
vo3@ietf.org> <mailto:nvo3@ietf.org

> >>> <nv=
o3@ietf.org>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=
=A0<mailto:nvo3@ietf.=
org <nvo3@ietf.or=
g> <

> >>> mailto:nvo3@ietf.org <n=
vo3@ietf.org>> <mailto:nvo3@ietf.org

> >>> <nv=
o3@ietf.org> <mailto:nvo3@ietf.org <nvo3@ietf.org>>>> >=C2=A0 =C2=A0 =C2=A0 >

> >>> >=C2=A0 =C2=A0 =C2=A0<mailto:nvo3@ietf.org <nvo3@ietf.org> <mailto:nvo3@ietf.org

> >>> <nv=
o3@ietf.org>> <mailto:nvo3@ietf.org <nvo3@ietf.org> <

> >>> mailto:nvo3@ietf.org <n=
vo3@ietf.org>>> >=C2=A0 =C2=A0 =C2=A0<mailto:nvo3@ietf.org

> >>> <nv=
o3@ietf.org> <mailto:nvo3@ietf.org <nvo3@ietf.org>> <

> >>> mailto:nvo3@ietf.org <n=
vo3@ietf.org> <mailto:nvo3@ietf.org

> >>> <nv=
o3@ietf.org>>>>>> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0=
 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>>>

> >>> https://www.ietf.org/mailman/listinfo/nv=
o3 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =
=C2=A0 >>>> >

> >>>=C2=A0 =C2=A0 =C2=A0>=C2=A0 =C2=A0 =C2=A0 > >=C2=
=A0 =C2=A0 =C2=A0 > >

> >>>

> >>>



> 

> 

> 

> 

> BFD=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0S. Pallagatti, Ed.

> Internet-Draft=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 VMware

> Intended status: Standards Track=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0S. Paragi=
ri

> Expires: May 2, 2020=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Contribu=
tor

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 V=
. Govindan

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0M.=
 Mudigonda

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 Cisco

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 G. Mirsky

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 ZTE Corp.

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0October 30, 2019=


> 

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 BFD for VXLAN

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0draft-ietf-bfd-vxlan-08

> 

> Abstract

> 

>=C2=A0 =C2=A0 This document describes the use of the Bidirectional Forw=
arding

>=C2=A0 =C2=A0 Detection (BFD) protocol in point-to-point Virtual eXtens=
ible Local

>=C2=A0 =C2=A0 Area Network (VXLAN) tunnels forming up an overlay networ=
k.

> 

> Status of This Memo

> 

>=C2=A0 =C2=A0 This Internet-Draft is submitted in full conformance with=
 the

>=C2=A0 =C2=A0 provisions of BCP 78 and BCP 79.

> 

>=C2=A0 =C2=A0 Internet-Drafts are working documents of the Internet Eng=
ineering

>=C2=A0 =C2=A0 Task Force (IETF).=C2=A0 Note that other groups may also =
distribute

>=C2=A0 =C2=A0 working documents as Internet-Drafts.=C2=A0 The list of c=
urrent Internet-

>=C2=A0 =C2=A0 Drafts is at https://datatracker.ietf.=
org/drafts/current/.

> 

>=C2=A0 =C2=A0 Internet-Drafts are draft documents valid for a maximum o=
f six months

>=C2=A0 =C2=A0 and may be updated, replaced, or obsoleted by other docum=
ents at any

>=C2=A0 =C2=A0 time.=C2=A0 It is inappropriate to use Internet-Drafts as=
 reference

>=C2=A0 =C2=A0 material or to cite them other than as "work in prog=
ress."

> 

>=C2=A0 =C2=A0 This Internet-Draft will expire on May 2, 2020.

> 

> Copyright Notice

> 

>=C2=A0 =C2=A0 Copyright (c) 2019 IETF Trust and the persons identified =
as the

>=C2=A0 =C2=A0 document authors.=C2=A0 All rights reserved.

> 

>=C2=A0 =C2=A0 This document is subject to BCP 78 and the IETF Trust'=
;s Legal

>=C2=A0 =C2=A0 Provisions Relating to IETF Documents

>=C2=A0 =C2=A0 (https://trustee.ietf.org/license-info) i=
n effect on the date of

>=C2=A0 =C2=A0 publication of this document.=C2=A0 Please review these d=
ocuments

>=C2=A0 =C2=A0 carefully, as they describe your rights and restrictions =
with respect

> 

> 

> 

> Pallagatti, et al.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Expires May 2, 202=
0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [Page 1]
> 

> Internet-Draft=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
BFD for VXLAN=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
October 2019

> 

> 

>=C2=A0 =C2=A0 to this document.=C2=A0 Code Components extracted from th=
is document must

>=C2=A0 =C2=A0 include Simplified BSD License text as described in Secti=
on 4.e of

>=C2=A0 =C2=A0 the Trust Legal Provisions and are provided without warra=
nty as

>=C2=A0 =C2=A0 described in the Simplified BSD License.

> 

> Table of Contents

> 

>=C2=A0 =C2=A0 1.=C2=A0 Introduction=C2=A0 . . . . . . . . . . . . . . .=
 . . . . . . . . .=C2=A0 =C2=A02

>=C2=A0 =C2=A0 2.=C2=A0 Conventions used in this document . . . . . . . =
. . . . . . .=C2=A0 =C2=A03

>=C2=A0 =C2=A0 =C2=A0 2.1.=C2=A0 Terminology . . . . . . . . . . . . . .=
 . . . . . . . . .=C2=A0 =C2=A03

>=C2=A0 =C2=A0 =C2=A0 2.2.=C2=A0 Requirements Language . . . . . . . . .=
 . . . . . . . . .=C2=A0 =C2=A03

>=C2=A0 =C2=A0 3.=C2=A0 Deployment=C2=A0 . . . . . . . . . . . . . . . .=
 . . . . . . . . .=C2=A0 =C2=A04

>=C2=A0 =C2=A0 4.=C2=A0 BFD Packet Transmission over VXLAN Tunnel . . . =
. . . . . . .=C2=A0 =C2=A05

>=C2=A0 =C2=A0 5.=C2=A0 Reception of BFD Packet from VXLAN Tunnel . . . =
. . . . . . .=C2=A0 =C2=A07

>=C2=A0 =C2=A0 =C2=A0 5.1.=C2=A0 Demultiplexing of the BFD Packet=C2=A0 =
. . . . . . . . . . . .=C2=A0 =C2=A08

>=C2=A0 =C2=A0 6.=C2=A0 Use of the Specific VNI . . . . . . . . . . . . =
. . . . . . .=C2=A0 =C2=A08

>=C2=A0 =C2=A0 7.=C2=A0 Echo BFD=C2=A0 . . . . . . . . . . . . . . . . .=
 . . . . . . . . .=C2=A0 =C2=A08

>=C2=A0 =C2=A0 8.=C2=A0 IANA Considerations . . . . . . . . . . . . . . =
. . . . . . .=C2=A0 =C2=A08

>=C2=A0 =C2=A0 9.=C2=A0 Security Considerations . . . . . . . . . . . . =
. . . . . . .=C2=A0 =C2=A08

>=C2=A0 =C2=A0 10. Contributors=C2=A0 . . . . . . . . . . . . . . . . . =
. . . . . . .=C2=A0 =C2=A09

>=C2=A0 =C2=A0 11. Acknowledgments . . . . . . . . . . . . . . . . . . .=
 . . . .=C2=A0 =C2=A09

>=C2=A0 =C2=A0 12. References=C2=A0 . . . . . . . . . . . . . . . . . . =
. . . . . . .=C2=A0 =C2=A09

>=C2=A0 =C2=A0 =C2=A0 12.1.=C2=A0 Normative References . . . . . . . . .=
 . . . . . . . . .=C2=A0 =C2=A09

>=C2=A0 =C2=A0 =C2=A0 12.2.=C2=A0 Informational References . . . . . . .=
 . . . . . . . . .=C2=A0 10

>=C2=A0 =C2=A0 Authors' Addresses=C2=A0 . . . . . . . . . . . . . . =
. . . . . . . . .=C2=A0 10

> 

> 1.=C2=A0 Introduction

> 

>=C2=A0 =C2=A0 "Virtual eXtensible Local Area Network" (VXLAN)=
 [RFC7348] provides an

>=C2=A0 =C2=A0 encapsulation scheme that allows building an overlay netw=
ork by

>=C2=A0 =C2=A0 decoupling the address space of the attached virtual host=
s from that

>=C2=A0 =C2=A0 of the network.

> 

>=C2=A0 =C2=A0 One use of VXLAN is in data centers interconnecting virtu=
al machines

>=C2=A0 =C2=A0 (VMs) of a tenant.=C2=A0 VXLAN addresses requirements of =
the Layer 2 and

>=C2=A0 =C2=A0 Layer 3 data center network infrastructure in the presenc=
e of VMs in

>=C2=A0 =C2=A0 a multi-tenant environment by providing a Layer 2 overlay=
 scheme on a

>=C2=A0 =C2=A0 Layer 3 network [RFC7348].=C2=A0 Another use is as an enc=
apsulation for

>=C2=A0 =C2=A0 Ethernet VPN [RFC8365].

> 

>=C2=A0 =C2=A0 This document is written assuming the use of VXLAN for vi=
rtualized

>=C2=A0 =C2=A0 hosts and refers to VMs and VXLAN Tunnel End Points (VTEP=
s) in

>=C2=A0 =C2=A0 hypervisors.=C2=A0 However, the concepts are equally appl=
icable to non-

>=C2=A0 =C2=A0 virtualized hosts attached to VTEPs in switches.

> 

>=C2=A0 =C2=A0 In the absence of a router in the overlay, a VM can commu=
nicate with

>=C2=A0 =C2=A0 another VM only if they are on the same VXLAN segment.=C2=
=A0 VMs are

>=C2=A0 =C2=A0 unaware of VXLAN tunnels as a VXLAN tunnel is terminated =
on a VTEP.

> 

> 

> 

> Pallagatti, et al.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Expires May 2, 202=
0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [Page 2]
> 

> Internet-Draft=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
BFD for VXLAN=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
October 2019

> 

> 

>=C2=A0 =C2=A0 VTEPs are responsible for encapsulating and decapsulating=
 frames

>=C2=A0 =C2=A0 exchanged among VMs.

> 

>=C2=A0 =C2=A0 Ability to monitor path continuity, i.e., perform proacti=
ve

>=C2=A0 =C2=A0 continuity check (CC) for point-to-point (p2p) VXLAN tunn=
els, is

>=C2=A0 =C2=A0 important.=C2=A0 The asynchronous mode of BFD, as defined=
 in [RFC5880], is

>=C2=A0 =C2=A0 used to monitor a p2p VXLAN tunnel.

> 

>=C2=A0 =C2=A0 In the case where a Multicast Service Node (MSN) (as desc=
ribed in

>=C2=A0 =C2=A0 Section 3.3 of [RFC8293]) resides behind a Network Virtua=
lization

>=C2=A0 =C2=A0 Endpoint (NVE), the mechanisms described in this document=
 apply and

>=C2=A0 =C2=A0 can, therefore, be used to test the connectivity from the=
 source NVE

>=C2=A0 =C2=A0 to the MSN.

> 

>=C2=A0 =C2=A0 This document describes the use of Bidirectional Forwardi=
ng Detection

>=C2=A0 =C2=A0 (BFD) protocol to enable monitoring continuity of the pat=
h between

>=C2=A0 =C2=A0 VXLAN VTEPs, performing as Network Virtualization Endpoin=
ts, and/or

>=C2=A0 =C2=A0 availability of a replicator multicast service node.

> 

> 2.=C2=A0 Conventions used in this document

> 

> 2.1.=C2=A0 Terminology

> 

>=C2=A0 =C2=A0 BFD Bidirectional Forwarding Detection

> 

>=C2=A0 =C2=A0 CC Continuity Check

> 

>=C2=A0 =C2=A0 p2p Point-to-point

> 

>=C2=A0 =C2=A0 MSN Multicast Service Node

> 

>=C2=A0 =C2=A0 NVE Network Virtualization Endpoint

> 

>=C2=A0 =C2=A0 VFI Virtual Forwarding Instance

> 

>=C2=A0 =C2=A0 VM Virtual Machine

> 

>=C2=A0 =C2=A0 VNI VXLAN Network Identifier (or VXLAN Segment ID)

> 

>=C2=A0 =C2=A0 VTEP VXLAN Tunnel End Point

> 

>=C2=A0 =C2=A0 VXLAN Virtual eXtensible Local Area Network

> 

> 2.2.=C2=A0 Requirements Language

> 

>=C2=A0 =C2=A0 The key words "MUST", "MUST NOT", &qu=
ot;REQUIRED", "SHALL", "SHALL NOT",

>=C2=A0 =C2=A0 "SHOULD", "SHOULD NOT", "RECOMME=
NDED", "NOT RECOMMENDED", "MAY", and

>=C2=A0 =C2=A0 "OPTIONAL" in this document are to be interpret=
ed as described in BCP

> 

> 

> 

> Pallagatti, et al.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Expires May 2, 202=
0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [Page 3]
> 

> Internet-Draft=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
BFD for VXLAN=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
October 2019

> 

> 

>=C2=A0 =C2=A0 14 [RFC2119] [RFC8174] when, and only when, they appear i=
n all

>=C2=A0 =C2=A0 capitals, as shown here.

> 

> 3.=C2=A0 Deployment

> 

>=C2=A0 =C2=A0 Figure 1 illustrates the scenario with two servers, each =
of them

>=C2=A0 =C2=A0 hosting two VMs.=C2=A0 The servers host VTEPs that termin=
ate two VXLAN

>=C2=A0 =C2=A0 tunnels with VXLAN Network Identifier (VNI) number 100 an=
d 200

>=C2=A0 =C2=A0 respectively.=C2=A0 Separate BFD sessions can be establis=
hed between the

>=C2=A0 =C2=A0 VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunn=
els (VNI 100

>=C2=A0 =C2=A0 and 200).=C2=A0 An implementation that supports this spec=
ification MUST be

>=C2=A0 =C2=A0 able to control the number of BFD sessions that can be cr=
eated

>=C2=A0 =C2=A0 between the same pair of VTEPs.=C2=A0 BFD packets intende=
d for a VTEP MUST

>=C2=A0 =C2=A0 NOT be forwarded to a VM as a VM may drop BFD packets lea=
ding to a

>=C2=A0 =C2=A0 false negative.=C2=A0 This method is applicable whether t=
he VTEP is a

>=C2=A0 =C2=A0 virtual or physical device.

> 

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0+------------+-------------+

>=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 Server 1=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0| +----+----+=C2=A0 +----+----+ |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0| |VM1-1=C2=A0 =C2=A0 |=C2=A0 |VM1-2=C2=A0 =
=C2=A0 | |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0| |VNI 100=C2=A0 |=C2=A0 |VNI 200=C2=A0 | |<=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0=
 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+=C2=A0 +---------+ |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 VTEP (IP1)=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0+--------------------------+

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0+-------------+

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0|=C2=A0 =C2=A0Layer 3=C2=A0=
 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---|=C2=A0 =C2=A0Network=C2=A0 =C2=A0|
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+-------------+

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+-----------+=


>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 +------------+-------------+

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0VTEP (IP2)=C2=A0 =C2=A0 =C2=A0 =C2=
=A0|

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 | +----+----+=C2=A0 +----+----+ |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 | |VM2-1=C2=A0 =C2=A0 |=C2=A0 |VM2-2=C2=A0 =C2=A0 | |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 | |VNI 100=C2=A0 |=C2=A0 |VNI 200=C2=A0 | |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0| |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 | +---------+=C2=A0 +---------+ |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 |=C2=A0 =C2=A0 =C2=A0 Server 2=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 |

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 +--------------------------+

> 

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 Figure 1: Reference VXLAN Domain

> 

> 

> 

> 

> Pallagatti, et al.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Expires May 2, 202=
0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [Page 4]
> 

> Internet-Draft=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
BFD for VXLAN=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
October 2019

> 

> 

>=C2=A0 =C2=A0 At the same time, a service layer BFD session may be used=
 between the

>=C2=A0 =C2=A0 tenants of VTEPs IP1 and IP2 to provide end-to-end fault =
management.

>=C2=A0 =C2=A0 In such case, for VTEPs BFD Control packets of that sessi=
on are

>=C2=A0 =C2=A0 indistinguishable from data packets.=C2=A0 If end-to-end =
defect detection

>=C2=A0 =C2=A0 is realized as the set of concatenated OAM domains, e.g.,=
 VM1-1 - IP1

>=C2=A0 =C2=A0 -- IP2 - VM2-1, then the BFD session over VXLAN between V=
TEPs SHOULD

>=C2=A0 =C2=A0 follow the procedures described in Section 6.8.17 [RFC588=
0].

> 

>=C2=A0 =C2=A0 As per Section 4, the inner destination IP address SHOULD=
 be set to

>=C2=A0 =C2=A0 one of the loopback addresses (127/8 range for IPv4 and
>=C2=A0 =C2=A0 0:0:0:0:0:FFFF:7F00:0/104 range for IPv6).=C2=A0 There co=
uld be a firewall

>=C2=A0 =C2=A0 configured on VTEP to block loopback addresses if set as =
the

>=C2=A0 =C2=A0 destination IP in the inner IP header.=C2=A0 It is RECOMM=
ENDED to allow

>=C2=A0 =C2=A0 addresses from the loopback range through a firewall only=
 if it is

>=C2=A0 =C2=A0 used as the destination IP address in the inner IP header=
, and the

>=C2=A0 =C2=A0 destination UDP port is set to 3784 [RFC5881].

> 

> 4.=C2=A0 BFD Packet Transmission over VXLAN Tunnel

> 

>=C2=A0 =C2=A0 BFD packet MUST be encapsulated and sent to a remote VTEP=
 as

>=C2=A0 =C2=A0 explained in this section.=C2=A0 Implementations SHOULD e=
nsure that the

>=C2=A0 =C2=A0 BFD packets follow the same lookup path as VXLAN data pac=
kets within

>=C2=A0 =C2=A0 the sender system.

> 

>=C2=A0 =C2=A0 BFD packets are encapsulated in VXLAN as described below.=
=C2=A0 The VXLAN

>=C2=A0 =C2=A0 packet format is defined in Section 5 of [RFC7348].=C2=A0=
 The Outer IP/UDP

>=C2=A0 =C2=A0 and VXLAN headers MUST be encoded by the sender as define=
d in

>=C2=A0 =C2=A0 [RFC7348].

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> Pallagatti, et al.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Expires May 2, 202=
0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [Page 5]
> 

> Internet-Draft=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
BFD for VXLAN=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
October 2019

> 

> 

>=C2=A0 =C2=A0 =C2=A0 0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A01=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A02=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A03

>=C2=A0 =C2=A0 =C2=A0 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 =
5 6 7 8 9 0 1

>=C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Outer Ethernet Header=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ~

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Outer IPvX Header=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ~

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Outer UDP Header=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0~

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0VXLAN Header=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ~

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 Inner Ethernet Header=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ~

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Inner IPvX Header=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ~

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Inner UDP Header=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ~

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0BFD Control Packet=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0~

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0|

>=C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+

>=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 FCS=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 |

>=C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Figure 2: VXLAN Encapsu=
lation of BFD Control Packet

> 

>=C2=A0 =C2=A0 The BFD packet MUST be carried inside the inner Ethernet =
frame of the

>=C2=A0 =C2=A0 VXLAN packet.=C2=A0 The choice of Destination MAC and Des=
tination IP

>=C2=A0 =C2=A0 addresses for the inner Ethernet frame MUST ensure that t=
he BFD

>=C2=A0 =C2=A0 Control packet is not forwarded to a tenant but is proces=
sed locally

>=C2=A0 =C2=A0 at the remote VTEP.=C2=A0 The inner Ethernet frame carryi=
ng the BFD

>=C2=A0 =C2=A0 Control packet- has the following format:

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0Ethernet Header:

> 

> 

> 

> Pallagatti, et al.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Expires May 2, 202=
0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [Page 6]
> 

> Internet-Draft=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
BFD for VXLAN=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
October 2019

> 

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Destination MAC: This MUST NOT be of=
 one of tenant's MAC

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 addresses.=C2=A0 The destination MAC=
 address MAY be the address

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 associated with the destination VTEP=
.=C2=A0 The MAC address MAY be

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 configured, or it MAY be learned via=
 a control plane protocol.

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 The details of how the MAC address i=
s obtained are outside the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 scope of this document.

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Source MAC: MAC address associated w=
ith the originating VTEP

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0IP header:

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Destination IP: IP address MUST NOT =
be of one of tenant's IP

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 addresses.=C2=A0 The IP address SHOU=
LD be selected from the range

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 127/8 for IPv4, for IPv6 - from the =
range

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 0:0:0:0:0:FFFF:7F00:0/104.=C2=A0 Alt=
ernatively, the destination IP

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 address MAY be set to VTEP's IP =
address.

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Source IP: IP address of the origina=
ting VTEP.

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TTL or Hop Limit: MUST be set to 1 t=
o ensure that the BFD

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 packet is not routed within the Laye=
r 3 underlay network.=C2=A0 This

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 addresses the scenario when the inne=
r IP destination address is

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 of VXLAN gateway and there is a rout=
er in underlay which

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 removes the VXLAN header, then it is=
 possible to route the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 packet as VXLAN=C2=A0 gateway addres=
s is routable address.

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0The fields of the UDP header and the BFD Con=
trol packet are

>=C2=A0 =C2=A0 =C2=A0 =C2=A0encoded as specified in [RFC5881].

> 

> 5.=C2=A0 Reception of BFD Packet from VXLAN Tunnel

> 

>=C2=A0 =C2=A0 Once a packet is received, VTEP MUST validate the packet.=
=C2=A0 If the

>=C2=A0 =C2=A0 Destination MAC of the inner Ethernet frame matches one o=
f the MAC

>=C2=A0 =C2=A0 addresses associated with the VTEP the packet MUST be pro=
cessed

>=C2=A0 =C2=A0 further.=C2=A0 If the Destination MAC of the inner Ethern=
et frame doesn't

>=C2=A0 =C2=A0 match any of VTEP's MAC addresses, then the processin=
g of the

>=C2=A0 =C2=A0 received VXLAN packet MUST follow the procedures describe=
d in

>=C2=A0 =C2=A0 Section 4.1 [RFC7348].

> 

>=C2=A0 =C2=A0 The UDP destination port and the TTL of the inner IP pack=
et MUST be

>=C2=A0 =C2=A0 validated to determine if the received packet can be proc=
essed by

>=C2=A0 =C2=A0 BFD.=C2=A0 BFD Control packets with unknown MAC address M=
UST NOT be

>=C2=A0 =C2=A0 forwarded to VMs.

> 

> 

> 

> 

> 

> 

> 

> 

> Pallagatti, et al.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Expires May 2, 202=
0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [Page 7]
> 

> Internet-Draft=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
BFD for VXLAN=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
October 2019

> 

> 

> 5.1.=C2=A0 Demultiplexing of the BFD Packet

> 

>=C2=A0 =C2=A0 Demultiplexing of IP BFD packet has been defined in Secti=
on 3 of

>=C2=A0 =C2=A0 [RFC5881].=C2=A0 Since multiple BFD sessions may be runni=
ng between two

>=C2=A0 =C2=A0 VTEPs, there needs to be a mechanism for demultiplexing r=
eceived BFD

>=C2=A0 =C2=A0 packets to the proper session.=C2=A0 For demultiplexing p=
ackets with Your

>=C2=A0 =C2=A0 Discriminator equal to 0, a BFD session MUST be identifie=
d using the

>=C2=A0 =C2=A0 logical link over which the BFD Control packet is receive=
d.=C2=A0 In the

>=C2=A0 =C2=A0 case of VXLAN, the VNI number identifies that logical lin=
k.=C2=A0 If BFD

>=C2=A0 =C2=A0 packet is received with non-zero Your Discriminator, then=
 BFD session

>=C2=A0 =C2=A0 MUST be demultiplexed only with Your Discriminator as the=
 key.

> 

> 6.=C2=A0 Use of the Specific VNI

> 

>=C2=A0 =C2=A0 In most cases, a single BFD session is sufficient for the=
 given VTEP

>=C2=A0 =C2=A0 to monitor the reachability of a remote VTEP, regardless =
of the

>=C2=A0 =C2=A0 number of VNIs.=C2=A0 When the single BFD session is used=
 to monitor the

>=C2=A0 =C2=A0 reachability of the remote VTEP, an implementation SHOULD=
 choose any

>=C2=A0 =C2=A0 of the VNIs.=C2=A0 An implementation MAY support the use =
of the Management

>=C2=A0 =C2=A0 VNI as control and management channel between VTEPs.=C2=
=A0 The selection

>=C2=A0 =C2=A0 of the VNI number of the Management VNI MUST be controlle=
d through

>=C2=A0 =C2=A0 management plane.=C2=A0 An implementation MAY use VNI num=
ber 1 as the

>=C2=A0 =C2=A0 default value for the Management VNI.=C2=A0 All VXLAN pac=
kets received on

>=C2=A0 =C2=A0 the Management VNI MUST be processed locally and MUST NOT=
 be

>=C2=A0 =C2=A0 forwarded to a tenant.

> 

> 7.=C2=A0 Echo BFD

> 

>=C2=A0 =C2=A0 Support for echo BFD is outside the scope of this documen=
t.

> 

> 8.=C2=A0 IANA Considerations

> 

>=C2=A0 =C2=A0 This specification has no IANA action requested.=C2=A0 Th=
is section may be

>=C2=A0 =C2=A0 deleted before the publication.

> 

> 9.=C2=A0 Security Considerations

> 

>=C2=A0 =C2=A0 The document requires setting the inner IP TTL to 1, whic=
h could be

>=C2=A0 =C2=A0 used as a DDoS attack vector.=C2=A0 Thus the implementati=
on MUST have

>=C2=A0 =C2=A0 throttling in place to control the rate of BFD Control pa=
ckets sent

>=C2=A0 =C2=A0 to the control plane.=C2=A0 On the other hand, over-aggre=
ssive throttling

>=C2=A0 =C2=A0 of BFD Control packets may become the cause of the inabil=
ity to form

>=C2=A0 =C2=A0 and maintain BFD session at scale.=C2=A0 Hence, throttlin=
g of BFD Control

>=C2=A0 =C2=A0 packets SHOULD be adjusted to permit BFD to work accordin=
g to its

>=C2=A0 =C2=A0 procedures.

> 

>=C2=A0 =C2=A0 If the implementation supports establishing multiple BFD =
sessions

>=C2=A0 =C2=A0 between the same pair of VTEPs, there SHOULD be a mechani=
sm to

> 

> 

> 

> Pallagatti, et al.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Expires May 2, 202=
0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [Page 8]
> 

> Internet-Draft=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
BFD for VXLAN=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
October 2019

> 

> 

>=C2=A0 =C2=A0 control the maximum number of such sessions that can be a=
ctive at the

>=C2=A0 =C2=A0 same time.

> 

>=C2=A0 =C2=A0 Other than inner IP TTL set to 1 and limit the number of =
BFD sessions

>=C2=A0 =C2=A0 between the same pair of VTEPs, this specification does n=
ot raise any

>=C2=A0 =C2=A0 additional security issues beyond those of the specificat=
ions

>=C2=A0 =C2=A0 referred to in the list of normative references.

> 

> 10.=C2=A0 Contributors

> 

> 

>=C2=A0 =C2=A0 Reshad Rahman

>=C2=A0 =C2=A0 rr=
ahman@cisco.com

>=C2=A0 =C2=A0 Cisco

> 

> 

> 11.=C2=A0 Acknowledgments

> 

>=C2=A0 =C2=A0 Authors would like to thank Jeff Haas of Juniper Networks=
 for his

>=C2=A0 =C2=A0 reviews and feedback on this material.

> 

>=C2=A0 =C2=A0 Authors would also like to thank Nobo Akiya, Marc Binderb=
erger,

>=C2=A0 =C2=A0 Shahram Davari, Donald E.=C2=A0 Eastlake 3rd, and Anoop G=
hanwani for the

>=C2=A0 =C2=A0 extensive reviews and the most detailed and helpful comme=
nts.

> 

> 12.=C2=A0 References

> 

> 12.1.=C2=A0 Normative References

> 

>=C2=A0 =C2=A0 [RFC2119]=C2=A0 Bradner, S., "Key words for use in R=
FCs to Indicate

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Requirement Leve=
ls", BCP 14, RFC 2119,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0DOI 10.17487/RFC=
2119, March 1997,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<https://www.rfc-editor.org/info/rfc2119>.

> 

>=C2=A0 =C2=A0 [RFC5880]=C2=A0 Katz, D. and D. Ward, "Bidirectional=
 Forwarding Detection

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(BFD)", RFC=
 5880, DOI 10.17487/RFC5880, June 2010,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<https://www.rfc-editor.org/info/rfc5880>.

> 

>=C2=A0 =C2=A0 [RFC5881]=C2=A0 Katz, D. and D. Ward, "Bidirectional=
 Forwarding Detection

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(BFD) for IPv4 a=
nd IPv6 (Single Hop)", RFC 5881,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0DOI 10.17487/RFC=
5881, June 2010,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<https://www.rfc-editor.org/info/rfc5881>.

> 

> 

> 

> 

> 

> 

> 

> 

> 

> Pallagatti, et al.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Expires May 2, 202=
0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [Page 9]
> 

> Internet-Draft=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
BFD for VXLAN=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
October 2019

> 

> 

>=C2=A0 =C2=A0 [RFC7348]=C2=A0 Mahalingam, M., Dutt, D., Duda, K., Agarw=
al, P., Kreeger,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0L., Sridhar, T.,=
 Bursell, M., and C. Wright, "Virtual

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0eXtensible Local=
 Area Network (VXLAN): A Framework for

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Overlaying Virtu=
alized Layer 2 Networks over Layer 3

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Networks", =
RFC 7348, DOI 10.17487/RFC7348, August 2014,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<https://www.rfc-editor.org/info/rfc7348>.

> 

>=C2=A0 =C2=A0 [RFC8174]=C2=A0 Leiba, B., "Ambiguity of Uppercase v=
s Lowercase in RFC

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A02119 Key Words&q=
uot;, BCP 14, RFC 8174, DOI 10.17487/RFC8174,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0May 2017, <https://www.rfc-editor.org/info/rfc8174>.

> 

> 12.2.=C2=A0 Informational References

> 

>=C2=A0 =C2=A0 [RFC8293]=C2=A0 Ghanwani, A., Dunbar, L., McBride, M., Ba=
nnai, V., and R.

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Krishnan, "=
A Framework for Multicast in Network

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Virtualization o=
ver Layer 3", RFC 8293,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0DOI 10.17487/RFC=
8293, January 2018,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<https://www.rfc-editor.org/info/rfc8293>.

> 

>=C2=A0 =C2=A0 [RFC8365]=C2=A0 Sajassi, A., Ed., Drake, J., Ed., Bitar, =
N., Shekhar, R.,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Uttaro, J., and =
W. Henderickx, "A Network Virtualization

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Overlay Solution=
 Using Ethernet VPN (EVPN)", RFC 8365,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0DOI 10.17487/RFC=
8365, March 2018,

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<https://www.rfc-editor.org/info/rfc8365>.

> 

> Authors' Addresses

> 

>=C2=A0 =C2=A0 Santosh Pallagatti (editor)

>=C2=A0 =C2=A0 VMware

> 

>=C2=A0 =C2=A0 Email: santosh.pallagatti@gmail.com

> 

> 

>=C2=A0 =C2=A0 Sudarsan Paragiri

>=C2=A0 =C2=A0 Individual Contributor

> 

>=C2=A0 =C2=A0 Email: sudarsan.225@gmail.com

> 

> 

>=C2=A0 =C2=A0 Vengada Prasad Govindan

>=C2=A0 =C2=A0 Cisco

> 

>=C2=A0 =C2=A0 Email: venggovi@cisco.com

> 

> 

> 

> 

> 

> 

> 

> 

> Pallagatti, et al.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Expires May 2, 202=
0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0[Page 10]
> 

> Internet-Draft=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
BFD for VXLAN=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
October 2019

> 

> 

>=C2=A0 =C2=A0 Mallik Mudigonda

>=C2=A0 =C2=A0 Cisco

> 

>=C2=A0 =C2=A0 Email: mmudigon@cisco.com

> 

> 

>=C2=A0 =C2=A0 Greg Mirsky

>=C2=A0 =C2=A0 ZTE Corp.

> 

>=C2=A0 =C2=A0 Email: gregimirsky@gmail.com

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> 

> Pallagatti, et al.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Expires May 2, 202=
0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0[Page 11]


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> <body data-gr-c-s-loaded=3D"true"> 

>=C2=A0 =C2=A0<table border=3D"0" cellpadding=3D"0&quo=
t; cellspacing=3D"0"> 

>=C2=A0 =C2=A0<tbody><tr id=3D"part-1" bgcolor=3D&quo=
t;orange"><th></th><th><a href=3D"https://www6.ietf.org/rfcdiff?url2=3Ddraf=
t-ietf-bfd-vxlan-07.txt" style=3D"color:#008; text-decoration=
:none;">&lt;</a>&nbsp;<a href=3D"https://tools.ietf.org/html/draft-ietf-bfd-vxlan-07.txt" style=3D"color:#008">draft-ietf-bfd-vxlan-07.txt</=
a>&nbsp;</th><th> </th><th>&nbsp;<a h=
ref=3D"https://tools.ietf.org/html/draft=
-ietf-bfd-vxlan-08.txt" style=3D"color:#008">draft-ie=
tf-bfd-vxlan-08.txt</a>&nbsp;<a href=3D"https://www6.ietf.org/rfcdiff?url1=3Ddraft-ietf-bfd-v=
xlan-08.txt" style=3D"color:#008; text-decoration:none;"=
>&gt;</a></th><th></th></tr> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">BFD=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
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=C2=A0 =C2=A0S. Pallagatti, Ed.</td><td> </td><td clas=
s=3D"right">BFD=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
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=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0S. Pallagatti=
, Ed.</td><td class=3D"lineno"></td></tr>=


>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0001"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">Internet-Draft=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
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span></td><td> </td><td class=3D"rblock"&=
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=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<span class=3D"=
insert"> VMware</span></td><td class=3D"lineno&=
quot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">Intended status: Standards=
 Track=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0S. Paragiri</td><td> </td=
><td class=3D"right">Intended status: Standards Track=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0S. Paragiri</td><td class=3D"linen=
o"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0002"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">Expires: <span class=
=3D"delete">November 18, 2019</span>=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual =
Contributor</td><td> </td><td class=3D"rblock&quo=
t;>Expires: <span class=3D"insert">May 2, 2020=C2=A0 =C2=
=A0 =C2=A0 </span>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Contributor</td><td =
class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0V. Govindan</td><td&g=
t; </td><td class=3D"right">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0V. Govindan</td><td c=
lass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 M. Mudigonda</td><td> &l=
t;/td><td class=3D"right">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 M. Mudigonda</td><td class=3D&q=
uot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cisco<=
/td><td> </td><td class=3D"right">=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Cisco</td><td class=3D"lineno"></td></=
tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0G. Mirsky</td><=
;td> </td><td class=3D"right">=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0G. Mirsky</td>=
<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ZTE Corp.</td><=
;td> </td><td class=3D"right">=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ZTE Corp.</td>=
<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0003"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 <span class=3D"delete">=C2=A0 =C2=
=A0 May 17</span>, 2019</td><td> </td><td class=
=3D"rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &=
lt;span class=3D"insert">October 30</span>, 2019</td&=
gt;<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0BFD for VXLAN</td><td> </td><td class=3D"ri=
ght">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0BFD for VXLAN</td><td cl=
ass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0004"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 draft-ietf-bfd-=
vxlan-0<span class=3D"delete">7</span></td><=
td> </td><td class=3D"rblock">=C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 draft-ietf-=
bfd-vxlan-0<span class=3D"insert">8</span></td>=
<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">Abstract</td><td&=
gt; </td><td class=3D"right">Abstract</td><t=
d class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0This document=
 describes the use of the Bidirectional Forwarding</td><td> <=
;/td><td class=3D"right">=C2=A0 =C2=A0This document desc=
ribes the use of the Bidirectional Forwarding</td><td class=3D&quo=
t;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Detection (BF=
D) protocol in point-to-point Virtual eXtensible Local</td><td>=
 </td><td class=3D"right">=C2=A0 =C2=A0Detection (BFD=
) protocol in point-to-point Virtual eXtensible Local</td><td clas=
s=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Area Network =
(VXLAN) tunnels forming up an overlay network.</td><td> </td=
><td class=3D"right">=C2=A0 =C2=A0Area Network (VXLAN) t=
unnels forming up an overlay network.</td><td class=3D"lineno=
"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">Status of This Memo</td=
><td> </td><td class=3D"right">Status of Thi=
s Memo</td><td class=3D"lineno"></td></tr>=
;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0This Internet=
-Draft is submitted in full conformance with the</td><td> </=
td><td class=3D"right">=C2=A0 =C2=A0This Internet-Draft =
is submitted in full conformance with the</td><td class=3D"li=
neno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"part-2" class=3D"=
;change"><td></td><th><small>skipping to ch=
ange at</small><a href=3D"https://www=
6.ietf.org/rfcdiff/rfcdiff.pyht#part-2"><em> page 1, line=
 38<span class=3D"hide"> =C2=B6</span></em><=
/a></th><th> </th><th><small>skipping to c=
hange at</small><a href=3D"https://ww=
w6.ietf.org/rfcdiff/rfcdiff.pyht#part-2"><em> page 1, lin=
e 38<span class=3D"hide"> =C2=B6</span></em><=
;/a></th><td></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Internet-Draf=
ts are working documents of the Internet Engineering</td><td> &=
lt;/td><td class=3D"right">=C2=A0 =C2=A0Internet-Drafts =
are working documents of the Internet Engineering</td><td class=3D=
"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Task Force (I=
ETF).=C2=A0 Note that other groups may also distribute</td><td>=
 </td><td class=3D"right">=C2=A0 =C2=A0Task Force (IE=
TF).=C2=A0 Note that other groups may also distribute</td><td clas=
s=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0working docum=
ents as Internet-Drafts.=C2=A0 The list of current Internet-</td><=
td> </td><td class=3D"right">=C2=A0 =C2=A0working =
documents as Internet-Drafts.=C2=A0 The list of current Internet-</td>=
;<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Drafts is at =
https://datatracker.ietf.org/drafts/current/.</td=
><td> </td><td class=3D"right">=C2=A0 =C2=A0=
Drafts is at https://datatracker.ietf.org/drafts/curre=
nt/.</td><td class=3D"lineno"></td></tr&=
gt;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Internet-Draf=
ts are draft documents valid for a maximum of six months</td><td&g=
t; </td><td class=3D"right">=C2=A0 =C2=A0Internet-Dra=
fts are draft documents valid for a maximum of six months</td><td =
class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0and may be up=
dated, replaced, or obsoleted by other documents at any</td><td>=
; </td><td class=3D"right">=C2=A0 =C2=A0and may be up=
dated, replaced, or obsoleted by other documents at any</td><td cl=
ass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0time.=C2=A0 I=
t is inappropriate to use Internet-Drafts as reference</td><td>=
 </td><td class=3D"right">=C2=A0 =C2=A0time.=C2=A0 It=
 is inappropriate to use Internet-Drafts as reference</td><td clas=
s=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0material or t=
o cite them other than as "work in progress."</td><td>=
; </td><td class=3D"right">=C2=A0 =C2=A0material or t=
o cite them other than as "work in progress."</td><td cl=
ass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0005"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0This Intern=
et-Draft will expire on <span class=3D"delete">November 18,=
 2019</span>.</td><td> </td><td class=3D"rb=
lock">=C2=A0 =C2=A0This Internet-Draft will expire on <span clas=
s=3D"insert">May 2, 2020</span>.</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">Copyright Notice</td>=
;<td> </td><td class=3D"right">Copyright Notice=
</td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Copyright (c)=
 2019 IETF Trust and the persons identified as the</td><td> <=
;/td><td class=3D"right">=C2=A0 =C2=A0Copyright (c) 2019=
 IETF Trust and the persons identified as the</td><td class=3D&quo=
t;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0document auth=
ors.=C2=A0 All rights reserved.</td><td> </td><td clas=
s=3D"right">=C2=A0 =C2=A0document authors.=C2=A0 All rights re=
served.</td><td class=3D"lineno"></td></tr&g=
t;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0This document=
 is subject to BCP 78 and the IETF Trust's Legal</td><td> &=
lt;/td><td class=3D"right">=C2=A0 =C2=A0This document is=
 subject to BCP 78 and the IETF Trust's Legal</td><td class=3D=
"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Provisions Re=
lating to IETF Documents</td><td> </td><td class=3D&qu=
ot;right">=C2=A0 =C2=A0Provisions Relating to IETF Documents</td=
><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0(=
https://trustee.ietf.org/license-info) in effect on the date of</td&=
gt;<td> </td><td class=3D"right">=C2=A0 =C2=A0(=
https://trustee.ietf.org/license-info) in effect on the dat=
e of</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0publication o=
f this document.=C2=A0 Please review these documents</td><td> &=
lt;/td><td class=3D"right">=C2=A0 =C2=A0publication of t=
his document.=C2=A0 Please review these documents</td><td class=3D=
"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"part-3" class=3D"=
;change"><td></td><th><small>skipping to ch=
ange at</small><a href=3D"https://www=
6.ietf.org/rfcdiff/rfcdiff.pyht#part-3"><em> page 2, line=
 17<span class=3D"hide"> =C2=B6</span></em><=
/a></th><th> </th><th><small>skipping to c=
hange at</small><a href=3D"https://ww=
w6.ietf.org/rfcdiff/rfcdiff.pyht#part-3"><em> page 2, lin=
e 17<span class=3D"hide"> =C2=B6</span></em><=
;/a></th><td></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0described in =
the Simplified BSD License.</td><td> </td><td class=3D=
"right">=C2=A0 =C2=A0described in the Simplified BSD License.&=
lt;/td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">Table of Contents</td&g=
t;<td> </td><td class=3D"right">Table of Conten=
ts</td><td class=3D"lineno"></td></tr>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A01.=C2=A0 Intr=
oduction=C2=A0 . . . . . . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=A0=
2</td><td> </td><td class=3D"right">=C2=
=A0 =C2=A01.=C2=A0 Introduction=C2=A0 . . . . . . . . . . . . . . . . . . .=
 . . . . .=C2=A0 =C2=A02</td><td class=3D"lineno"><=
;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A02.=C2=A0 Conv=
entions used in this document . . . . . . . . . . . . . .=C2=A0 =C2=A03<=
/td><td> </td><td class=3D"right">=C2=A0 =C2=
=A02.=C2=A0 Conventions used in this document . . . . . . . . . . . . . .=
=C2=A0 =C2=A03</td><td class=3D"lineno"></td>&l=
t;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A02.1.=
=C2=A0 Terminology . . . . . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=
=A03</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0 =C2=A02.1.=C2=A0 Terminology . . . . . . . . . . . . . . . . =
. . . . . . .=C2=A0 =C2=A03</td><td class=3D"lineno">=
</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A02.2.=
=C2=A0 Requirements Language . . . . . . . . . . . . . . . . . .=C2=A0 =C2=
=A03</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0 =C2=A02.2.=C2=A0 Requirements Language . . . . . . . . . . . =
. . . . . . .=C2=A0 =C2=A03</td><td class=3D"lineno">=
</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A03.=C2=A0 Depl=
oyment=C2=A0 . . . . . . . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=A0=
4</td><td> </td><td class=3D"right">=C2=
=A0 =C2=A03.=C2=A0 Deployment=C2=A0 . . . . . . . . . . . . . . . . . . . .=
 . . . . .=C2=A0 =C2=A04</td><td class=3D"lineno"><=
;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A04.=C2=A0 BFD =
Packet Transmission over VXLAN Tunnel . . . . . . . . . .=C2=A0 =C2=A05<=
/td><td> </td><td class=3D"right">=C2=A0 =C2=
=A04.=C2=A0 BFD Packet Transmission over VXLAN Tunnel . . . . . . . . . .=
=C2=A0 =C2=A05</td><td class=3D"lineno"></td>&l=
t;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0006"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0 =C2=A04.1.=C2=A0 BFD Packet Encapsulation in V=
XLAN . . . . . . . . . . . .=C2=A0 =C2=A06</span></td><td>=
; </td><td class=3D"rblock"></td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A05.=C2=A0 Rece=
ption of BFD Packet from VXLAN Tunnel . . . . . . . . . .=C2=A0 =C2=A07<=
/td><td> </td><td class=3D"right">=C2=A0 =C2=
=A05.=C2=A0 Reception of BFD Packet from VXLAN Tunnel . . . . . . . . . .=
=C2=A0 =C2=A07</td><td class=3D"lineno"></td>&l=
t;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0007"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A05.1.=
=C2=A0 Demultiplexing of the BFD Packet=C2=A0 . . . . . . . . . . . .=C2=A0=
 =C2=A0<span class=3D"delete">7</span></td><=
td> </td><td class=3D"rblock">=C2=A0 =C2=A0 =C2=A0=
5.1.=C2=A0 Demultiplexing of the BFD Packet=C2=A0 . . . . . . . . . . . .=
=C2=A0 =C2=A0<span class=3D"insert">8</span></td&g=
t;<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A06.=C2=A0 Use =
of the Specific VNI . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=A08<=
/td><td> </td><td class=3D"right">=C2=A0 =C2=
=A06.=C2=A0 Use of the Specific VNI . . . . . . . . . . . . . . . . . . .=
=C2=A0 =C2=A08</td><td class=3D"lineno"></td>&l=
t;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A07.=C2=A0 Echo=
 BFD=C2=A0 . . . . . . . . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=A0=
8</td><td> </td><td class=3D"right">=C2=
=A0 =C2=A07.=C2=A0 Echo BFD=C2=A0 . . . . . . . . . . . . . . . . . . . . .=
 . . . . .=C2=A0 =C2=A08</td><td class=3D"lineno"><=
;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A08.=C2=A0 IANA=
 Considerations . . . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=A08<=
/td><td> </td><td class=3D"right">=C2=A0 =C2=
=A08.=C2=A0 IANA Considerations . . . . . . . . . . . . . . . . . . . . .=
=C2=A0 =C2=A08</td><td class=3D"lineno"></td>&l=
t;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A09.=C2=A0 Secu=
rity Considerations . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=A08<=
/td><td> </td><td class=3D"right">=C2=A0 =C2=
=A09.=C2=A0 Security Considerations . . . . . . . . . . . . . . . . . . .=
=C2=A0 =C2=A08</td><td class=3D"lineno"></td>&l=
t;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0008"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A010. Contrib=
utors=C2=A0 . . . . . . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=A0<=
;span class=3D"delete">8</span></td><td> <=
;/td><td class=3D"rblock">=C2=A0 =C2=A010. Contributors=
=C2=A0 . . . . . . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=A0<span=
 class=3D"insert">9</span></td><td class=3D&quo=
t;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A011. Acknowled=
gments . . . . . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=A09</td&g=
t;<td> </td><td class=3D"right">=C2=A0 =C2=A011=
. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=
=A09</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A012. Reference=
s=C2=A0 . . . . . . . . . . . . . . . . . . . . . . . . .=C2=A0 =C2=A09<=
/td><td> </td><td class=3D"right">=C2=A0 =C2=
=A012. References=C2=A0 . . . . . . . . . . . . . . . . . . . . . . . . .=
=C2=A0 =C2=A09</td><td class=3D"lineno"></td>&l=
t;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A012.1.=
=C2=A0 Normative References . . . . . . . . . . . . . . . . . .=C2=A0 =C2=
=A09</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0 =C2=A012.1.=C2=A0 Normative References . . . . . . . . . . . =
. . . . . . .=C2=A0 =C2=A09</td><td class=3D"lineno">=
</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0009"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A012.2=
.=C2=A0 Informational References . . . . . . . . . . . . . . . .=C2=A0 <=
span class=3D"delete"> 9</span></td><td> <=
;/td><td class=3D"rblock">=C2=A0 =C2=A0 =C2=A012.2.=C2=
=A0 Informational References . . . . . . . . . . . . . . . .=C2=A0 <span=
 class=3D"insert">10</span></td><td class=3D&qu=
ot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Authors' =
Addresses=C2=A0 . . . . . . . . . . . . . . . . . . . . . . .=C2=A0 10</=
td><td> </td><td class=3D"right">=C2=A0 =C2=
=A0Authors' Addresses=C2=A0 . . . . . . . . . . . . . . . . . . . . . .=
 .=C2=A0 10</td><td class=3D"lineno"></td></=
tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">1.=C2=A0 Introduction</=
td><td> </td><td class=3D"right">1.=C2=A0 In=
troduction</td><td class=3D"lineno"></td></t=
r>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0"Virtual=
 eXtensible Local Area Network" (VXLAN) [RFC7348] provides an</td&g=
t;<td> </td><td class=3D"right">=C2=A0 =C2=A0&q=
uot;Virtual eXtensible Local Area Network" (VXLAN) [RFC7348] provides =
an</td><td class=3D"lineno"></td></tr>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0encapsulation=
 scheme that allows building an overlay network by</td><td> <=
;/td><td class=3D"right">=C2=A0 =C2=A0encapsulation sche=
me that allows building an overlay network by</td><td class=3D&quo=
t;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0decoupling th=
e address space of the attached virtual hosts from that</td><td>=
; </td><td class=3D"right">=C2=A0 =C2=A0decoupling th=
e address space of the attached virtual hosts from that</td><td cl=
ass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0of the networ=
k.</td><td> </td><td class=3D"right">=C2=
=A0 =C2=A0of the network.</td><td class=3D"lineno">&l=
t;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0One use of VX=
LAN is in data centers interconnecting virtual machines</td><td>=
; </td><td class=3D"right">=C2=A0 =C2=A0One use of VX=
LAN is in data centers interconnecting virtual machines</td><td cl=
ass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"part-4" class=3D"=
;change"><td></td><th><small>skipping to ch=
ange at</small><a href=3D"https://www=
6.ietf.org/rfcdiff/rfcdiff.pyht#part-4"><em> page 3, line=
 5<span class=3D"hide"> =C2=B6</span></em></=
a></th><th> </th><th><small>skipping to ch=
ange at</small><a href=3D"https://www=
6.ietf.org/rfcdiff/rfcdiff.pyht#part-4"><em> page 3, line=
 4<span class=3D"hide"> =C2=B6</span></em></=
a></th><td></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Ethernet VPN =
[RFC8365].</td><td> </td><td class=3D"right"=
>=C2=A0 =C2=A0Ethernet VPN [RFC8365].</td><td class=3D"lin=
eno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0This document=
 is written assuming the use of VXLAN for virtualized</td><td> =
</td><td class=3D"right">=C2=A0 =C2=A0This document i=
s written assuming the use of VXLAN for virtualized</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0hosts and ref=
ers to VMs and VXLAN Tunnel End Points (VTEPs) in</td><td> <=
/td><td class=3D"right">=C2=A0 =C2=A0hosts and refers to=
 VMs and VXLAN Tunnel End Points (VTEPs) in</td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0hypervisors.=
=C2=A0 However, the concepts are equally applicable to non-</td><t=
d> </td><td class=3D"right">=C2=A0 =C2=A0hyperviso=
rs.=C2=A0 However, the concepts are equally applicable to non-</td>&l=
t;td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0virtualized h=
osts attached to VTEPs in switches.</td><td> </td><td =
class=3D"right">=C2=A0 =C2=A0virtualized hosts attached to VTE=
Ps in switches.</td><td class=3D"lineno"></td>&=
lt;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0In the absenc=
e of a router in the overlay, a VM can communicate with</td><td>=
; </td><td class=3D"right">=C2=A0 =C2=A0In the absenc=
e of a router in the overlay, a VM can communicate with</td><td cl=
ass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0another VM on=
ly if they are on the same VXLAN segment.=C2=A0 VMs are</td><td>=
; </td><td class=3D"right">=C2=A0 =C2=A0another VM on=
ly if they are on the same VXLAN segment.=C2=A0 VMs are</td><td cl=
ass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0unaware of VX=
LAN tunnels as a VXLAN tunnel is terminated on a VTEP.</td><td>=
 </td><td class=3D"right">=C2=A0 =C2=A0unaware of VXL=
AN tunnels as a VXLAN tunnel is terminated on a VTEP.</td><td clas=
s=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0010"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0</span></td><=
;td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0VTEPs are res=
ponsible for encapsulating and decapsulating frames</td><td> &l=
t;/td><td class=3D"right">=C2=A0 =C2=A0VTEPs are respons=
ible for encapsulating and decapsulating frames</td><td class=3D&q=
uot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0exchanged amo=
ng VMs.</td><td> </td><td class=3D"right">=
;=C2=A0 =C2=A0exchanged among VMs.</td><td class=3D"lineno&qu=
ot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Ability to mo=
nitor path continuity, i.e., perform proactive</td><td> </td=
><td class=3D"right">=C2=A0 =C2=A0Ability to monitor pat=
h continuity, i.e., perform proactive</td><td class=3D"lineno=
"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0continuity ch=
eck (CC) for point-to-point (p2p) VXLAN tunnels, is</td><td> &l=
t;/td><td class=3D"right">=C2=A0 =C2=A0continuity check =
(CC) for point-to-point (p2p) VXLAN tunnels, is</td><td class=3D&q=
uot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0011"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0important.=
=C2=A0 The asynchronous mode of BFD, as defined in [RFC5880],</td><=
;td> </td><td class=3D"rblock">=C2=A0 =C2=A0import=
ant.=C2=A0 The asynchronous mode of BFD, as defined in [RFC5880], <span =
class=3D"insert">is</span></td><td class=3D&quo=
t;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0<span cl=
ass=3D"delete">can be</span> used to monitor a p2p VXLAN=
 tunnel.</td><td> </td><td class=3D"rblock"&=
gt;=C2=A0 =C2=A0used to monitor a p2p VXLAN tunnel.</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0In the case w=
here a Multicast Service Node (MSN) (as described in</td><td> &=
lt;/td><td class=3D"right">=C2=A0 =C2=A0In the case wher=
e a Multicast Service Node (MSN) (as described in</td><td class=3D=
"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0012"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0Section 3.3=
 of [RFC8293]) resides behind <span class=3D"delete">an NVE=
,</span> the mechanisms</td><td> </td><td class=
=3D"rblock">=C2=A0 =C2=A0Section 3.3 of [RFC8293]) resides beh=
ind <span class=3D"insert">a Network Virtualization</spa=
n></td><td class=3D"lineno"></td></tr>=


>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0described i=
n this document apply and can, therefore, be used to test</td><td&=
gt; </td><td class=3D"rblock"><span class=3D"=
insert">=C2=A0 =C2=A0Endpoint (NVE),</span> the mechanisms de=
scribed in this document apply and</td><td class=3D"lineno&qu=
ot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0the connect=
ivity from the source NVE to the MSN.</td><td> </td><t=
d class=3D"rblock">=C2=A0 =C2=A0can, therefore, be used to tes=
t the connectivity from the source NVE</td><td class=3D"linen=
o"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0to the MSN.</=
td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0This document=
 describes the use of Bidirectional Forwarding Detection</td><td&g=
t; </td><td class=3D"right">=C2=A0 =C2=A0This documen=
t describes the use of Bidirectional Forwarding Detection</td><td =
class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0(BFD) protoco=
l to enable monitoring continuity of the path between</td><td> =
</td><td class=3D"right">=C2=A0 =C2=A0(BFD) protocol =
to enable monitoring continuity of the path between</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0VXLAN VTEPs, =
performing as Network Virtualization Endpoints, and/or</td><td>=
 </td><td class=3D"right">=C2=A0 =C2=A0VXLAN VTEPs, p=
erforming as Network Virtualization Endpoints, and/or</td><td clas=
s=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0availability =
of a replicator multicast service node.</td><td> </td><=
;td class=3D"right">=C2=A0 =C2=A0availability of a replicator =
multicast service node.</td><td class=3D"lineno"><=
/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">2.=C2=A0 Conventions used =
in this document</td><td> </td><td class=3D"right=
">2.=C2=A0 Conventions used in this document</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">2.1.=C2=A0 Terminology<=
/td><td> </td><td class=3D"right">2.1.=C2=A0=
 Terminology</td><td class=3D"lineno"></td><=
/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0BFD Bidirecti=
onal Forwarding Detection</td><td> </td><td class=3D&q=
uot;right">=C2=A0 =C2=A0BFD Bidirectional Forwarding Detection</=
td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0CC Continuity=
 Check</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0CC Continuity Check</td><td class=3D"lineno"=
;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0p2p Point-to-=
point</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0p2p Point-to-point</td><td class=3D"lineno"=
></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0MSN Multicast=
 Service Node</td><td> </td><td class=3D"right&qu=
ot;>=C2=A0 =C2=A0MSN Multicast Service Node</td><td class=3D&qu=
ot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0013"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0<span class=
=3D"insert">NVE Network Virtualization Endpoint</span>&l=
t;/td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0</td><td class=3D"lineno"></td></t=
r>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0VFI Virtual F=
orwarding Instance</td><td> </td><td class=3D"rig=
ht">=C2=A0 =C2=A0VFI Virtual Forwarding Instance</td><td c=
lass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0VM Virtual Ma=
chine</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0VM Virtual Machine</td><td class=3D"lineno"=
></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0014"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0<span class=
=3D"insert">VNI VXLAN Network Identifier (or VXLAN Segment ID)=
</span></td><td class=3D"lineno"></td><=
;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0</td><td class=3D"lineno"></td></t=
r>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0VTEP VXLAN Tu=
nnel End Point</td><td> </td><td class=3D"right&q=
uot;>=C2=A0 =C2=A0VTEP VXLAN Tunnel End Point</td><td class=3D&=
quot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0VXLAN Virtual=
 eXtensible Local Area Network</td><td> </td><td class=
=3D"right">=C2=A0 =C2=A0VXLAN Virtual eXtensible Local Area Ne=
twork</td><td class=3D"lineno"></td></tr>=


>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">2.2.=C2=A0 Requirements La=
nguage</td><td> </td><td class=3D"right">=
2.2.=C2=A0 Requirements Language</td><td class=3D"lineno"=
;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0The key words=
 "MUST", "MUST NOT", "REQUIRED", "SHALL&=
quot;, "SHALL NOT",</td><td> </td><td class=
=3D"right">=C2=A0 =C2=A0The key words "MUST", "=
MUST NOT", "REQUIRED", "SHALL", "SHALL NOT&qu=
ot;,</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0"SHOULD&=
quot;, "SHOULD NOT", "RECOMMENDED", "NOT RECOMMEND=
ED", "MAY", and</td><td> </td><td class=
=3D"right">=C2=A0 =C2=A0"SHOULD", "SHOULD NOT&q=
uot;, "RECOMMENDED", "NOT RECOMMENDED", "MAY"=
, and</td><td class=3D"lineno"></td></tr>=


>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0"OPTIONA=
L" in this document are to be interpreted as described in BCP</td&g=
t;<td> </td><td class=3D"right">=C2=A0 =C2=A0&q=
uot;OPTIONAL" in this document are to be interpreted as described in B=
CP</td><td class=3D"lineno"></td></tr>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A014 [RFC2119] =
[RFC8174] when, and only when, they appear in all</td><td> <=
/td><td class=3D"right">=C2=A0 =C2=A014 [RFC2119] [RFC81=
74] when, and only when, they appear in all</td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0capitals, as =
shown here.</td><td> </td><td class=3D"right"=
;>=C2=A0 =C2=A0capitals, as shown here.</td><td class=3D"l=
ineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">3.=C2=A0 Deployment</td=
><td> </td><td class=3D"right">3.=C2=A0 Depl=
oyment</td><td class=3D"lineno"></td></tr>=
;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Figure 1 illu=
strates the scenario with two servers, each of them</td><td> &l=
t;/td><td class=3D"right">=C2=A0 =C2=A0Figure 1 illustra=
tes the scenario with two servers, each of them</td><td class=3D&q=
uot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0hosting two V=
Ms.=C2=A0 The servers host VTEPs that terminate two VXLAN</td><td&=
gt; </td><td class=3D"right">=C2=A0 =C2=A0hosting two=
 VMs.=C2=A0 The servers host VTEPs that terminate two VXLAN</td><t=
d class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0015"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0tunnels wit=
h <span class=3D"delete">VNI</span> number 100 and 20=
0 respectively.=C2=A0 Separate BFD</td><td> </td><td c=
lass=3D"rblock">=C2=A0 =C2=A0tunnels with <span class=3D&qu=
ot;insert">VXLAN Network Identifier (VNI)</span> number 100 a=
nd 200</td><td class=3D"lineno"></td></tr>=
;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0sessions ca=
n be established between the VTEPs (IP1 and IP2) for</td><td> &=
lt;/td><td class=3D"rblock">=C2=A0 =C2=A0respectively.=
=C2=A0 Separate BFD sessions can be established between the</td><t=
d class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0monitoring =
each of the VXLAN tunnels (VNI 100 and 200).=C2=A0 An</td><td> =
</td><td class=3D"rblock">=C2=A0 =C2=A0VTEPs (IP1 and=
 IP2) for monitoring each of the VXLAN tunnels (VNI 100</td><td cl=
ass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0implementat=
ion that supports this specification MUST be able to</td><td> &=
lt;/td><td class=3D"rblock">=C2=A0 =C2=A0and 200).=C2=A0=
 An implementation that supports this specification MUST be</td><t=
d class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0control the=
 number of BFD sessions that can be created between the</td><td>=
; </td><td class=3D"rblock">=C2=A0 =C2=A0able to cont=
rol the number of BFD sessions that can be created</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0same pair o=
f VTEPs.=C2=A0 BFD packets intended for a <span class=3D"delete&quo=
t;>Hypervisor</span> VTEP MUST</td><td> </td><=
;td class=3D"rblock">=C2=A0 =C2=A0between the same pair of VTE=
Ps.=C2=A0 BFD packets intended for a VTEP MUST</td><td class=3D&qu=
ot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0NOT be forwar=
ded to a VM as a VM may drop BFD packets leading to a</td><td> =
</td><td class=3D"right">=C2=A0 =C2=A0NOT be forwarde=
d to a VM as a VM may drop BFD packets leading to a</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0false negativ=
e.=C2=A0 This method is applicable whether the VTEP is a</td><td&g=
t; </td><td class=3D"right">=C2=A0 =C2=A0false negati=
ve.=C2=A0 This method is applicable whether the VTEP is a</td><td =
class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0virtual or ph=
ysical device.</td><td> </td><td class=3D"right&q=
uot;>=C2=A0 =C2=A0virtual or physical device.</td><td class=3D&=
quot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 +----=
--------+-------------+</td><td> </td><td class=3D&quo=
t;right">=C2=A0 =C2=A0 =C2=A0 +------------+-------------+</td&g=
t;<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 |=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 Server 1=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |</t=
d><td> </td><td class=3D"right">=C2=A0 =C2=
=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 Server 1=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 |</td><td class=3D"lineno"></td></tr=
>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0016"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |</span></td&=
gt;<td> </td><td class=3D"rblock"></td>&l=
t;td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 | +--=
--+----+=C2=A0 +----+----+ |</td><td> </td><td class=
=3D"right">=C2=A0 =C2=A0 =C2=A0 | +----+----+=C2=A0 +----+----=
+ |</td><td class=3D"lineno"></td></tr>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 | |VM=
1-1=C2=A0 =C2=A0 |=C2=A0 |VM1-2=C2=A0 =C2=A0 | |</td><td> </=
td><td class=3D"right">=C2=A0 =C2=A0 =C2=A0 | |VM1-1=C2=
=A0 =C2=A0 |=C2=A0 |VM1-2=C2=A0 =C2=A0 | |</td><td class=3D"l=
ineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 | |VN=
I 100=C2=A0 |=C2=A0 |VNI 200=C2=A0 | |</td><td> </td><=
td class=3D"right">=C2=A0 =C2=A0 =C2=A0 | |VNI 100=C2=A0 |=C2=
=A0 |VNI 200=C2=A0 | |</td><td class=3D"lineno"></=
td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 | |=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0| |</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0 =C2=A0 | |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 |=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0| |</td><td class=3D"lineno"&=
gt;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 | +--=
-------+=C2=A0 +---------+ |</td><td> </td><td class=
=3D"right">=C2=A0 =C2=A0 =C2=A0 | +---------+=C2=A0 +---------=
+ |</td><td class=3D"lineno"></td></tr>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0017"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 | &=
lt;span class=3D"delete">Hypervisor VTEP (IP1)</span>=C2=
=A0 =C2=A0 |</td><td> </td><td class=3D"rblock&qu=
ot;>=C2=A0 =C2=A0 =C2=A0 | <span class=3D"insert">=C2=A0=
 =C2=A0 =C2=A0 =C2=A0VTEP (IP1)=C2=A0 =C2=A0 </span>=C2=A0 =C2=A0 |&l=
t;/td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 +----=
----------------------+</td><td> </td><td class=3D&quo=
t;right">=C2=A0 =C2=A0 =C2=A0 +--------------------------+</td&g=
t;<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=
</td><td> </td><td class=3D"right">=C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 |</td><td class=3D"lineno"></td&=
gt;</tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0018"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &=
lt;span class=3D"delete">|</span></td><td> &=
lt;/td><td class=3D"rblock"></td><td class=3D&q=
uot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |</span></td><td> =
</td><td class=3D"rblock"></td><td class=3D&=
quot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=
=C2=A0 =C2=A0+-------------+</td><td> </td><td class=
=3D"right">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0+-----------=
--+</td><td class=3D"lineno"></td></tr>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=
=C2=A0 =C2=A0|=C2=A0 =C2=A0Layer 3=C2=A0 =C2=A0|</td><td> </=
td><td class=3D"right">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =
=C2=A0|=C2=A0 =C2=A0Layer 3=C2=A0 =C2=A0|</td><td class=3D"li=
neno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0019"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &=
lt;span class=3D"delete">|---|</span>=C2=A0 =C2=A0Networ=
k=C2=A0 =C2=A0<span class=3D"delete">|</span></td&=
gt;<td> </td><td class=3D"rblock">=C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 <span class=3D"insert">+---|</span>=C2=A0 =
=C2=A0Network=C2=A0 =C2=A0|</td><td class=3D"lineno">=
</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |</span>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|</td><td> </td>=
<td class=3D"rblock"></td><td class=3D"lineno=
"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-------------+</td><td> </td><td class=
=3D"right">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +-----------=
--+</td><td class=3D"lineno"></td></tr>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 |</td><td> </td><td class=
=3D"right">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 |</td><td class=3D"lineno"></td></tr>=


>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0020"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |</sp=
an></td><td> </td><td class=3D"rblock">=
;</td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 +-----------+</td><td> </td>&=
lt;td class=3D"right">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 +-----------+</td><td class=3D"lineno">=
</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |<=
/td><td> </td><td class=3D"right">=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 |</td><td class=3D"lineno"></td><=
/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0021"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |</span></td><td> <=
/td><td class=3D"rblock"></td><td class=3D"=
;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+------------+-------------=
+</td><td> </td><td class=3D"right">=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+-----=
-------+-------------+</td><td class=3D"lineno"></=
td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0022"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 <span cla=
ss=3D"delete">Hypervisor VTEP (IP2)</span> |</td>&=
lt;td> </td><td class=3D"rblock">=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 <s=
pan class=3D"insert">=C2=A0 =C2=A0 =C2=A0VTEP (IP2)=C2=A0 =C2=
=A0 =C2=A0 </span> |</td><td class=3D"lineno">&=
lt;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| +----+----+=C2=A0 +----+-=
---+ |</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| =
+----+----+=C2=A0 +----+----+ |</td><td class=3D"lineno"=
></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| |VM2-1=C2=A0 =C2=A0 |=C2=
=A0 |VM2-2=C2=A0 =C2=A0 | |</td><td> </td><td class=3D=
"right">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0| |VM2-1=C2=A0 =C2=A0 |=C2=A0 |VM2-2=C2=A0 =C2=A0 | |&l=
t;/td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| |VNI 100=C2=A0 |=C2=A0 |V=
NI 200=C2=A0 | |</td><td> </td><td class=3D"right=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0| |VNI 100=C2=A0 |=C2=A0 |VNI 200=C2=A0 | |</td><td clas=
s=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0|=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| |</td><td&g=
t; </td><td class=3D"right">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| |=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0|=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| |</td><td c=
lass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| +---------+=C2=A0 +------=
---+ |</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| =
+---------+=C2=A0 +---------+ |</td><td class=3D"lineno"=
></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 Serve=
r 2=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |</td><td> </td=
><td class=3D"right">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 Server 2=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |</td><td class=3D"lineno&=
quot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+--------------------------=
+</td><td> </td><td class=3D"right">=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+-----=
---------------------+</td><td class=3D"lineno"></=
td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Figure 1: Reference VXL=
AN Domain</td><td> </td><td class=3D"right"&=
gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Figure 1: Reference VXLAN Domain</td><td class=3D"linen=
o"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0023"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0<span class=
=3D"insert">At the same time, a service layer BFD session may =
be used between the</span></td><td class=3D"lineno"=
;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0tenants of VTEPs IP1 and IP2 to provide end-to-end f=
ault management.</span></td><td class=3D"lineno"&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0In such case, for VTEPs BFD Control packets of that =
session are</span></td><td class=3D"lineno"><=
;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0indistinguishable from data packets.=C2=A0 If end-to=
-end defect detection</span></td><td class=3D"lineno&qu=
ot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0is realized as the set of concatenated OAM domains, =
e.g., VM1-1 - IP1</span></td><td class=3D"lineno"&=
gt;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0-- IP2 - VM2-1, then the BFD session over VXLAN betw=
een VTEPs SHOULD</span></td><td class=3D"lineno"&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0follow the procedures described in Section 6.8.17 [R=
FC5880].</span></td><td class=3D"lineno"></t=
d></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
"></span></td><td class=3D"lineno"><=
/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0As per Section 4, the inner destination IP address S=
HOULD be set to</span></td><td class=3D"lineno">=
;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0one of the loopback addresses (127/8 range for IPv4 =
and</span></td><td class=3D"lineno"></td>=
</tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A00:0:0:0:0:FFFF:7F00:0/104 range for IPv6).=C2=A0 The=
re could be a firewall</span></td><td class=3D"lineno&q=
uot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0configured on VTEP to block loopback addresses if se=
t as the</span></td><td class=3D"lineno"></t=
d></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0destination IP in the inner IP header.=C2=A0 It is R=
ECOMMENDED to allow</span></td><td class=3D"lineno"=
;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0addresses from the loopback range through a firewall=
 only if it is</span></td><td class=3D"lineno">=
</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0used as the destination IP address in the inner IP h=
eader, and the</span></td><td class=3D"lineno">=
</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0destination UDP port is set to 3784 [RFC5881].</s=
pan></td><td class=3D"lineno"></td></tr&g=
t;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0</td><td class=3D"lineno"></td></t=
r>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">4.=C2=A0 BFD Packet Transm=
ission over VXLAN Tunnel</td><td> </td><td class=3D&qu=
ot;right">4.=C2=A0 BFD Packet Transmission over VXLAN Tunnel</td=
><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0BFD packet MU=
ST be encapsulated and sent to a remote VTEP as</td><td> </t=
d><td class=3D"right">=C2=A0 =C2=A0BFD packet MUST be en=
capsulated and sent to a remote VTEP as</td><td class=3D"line=
no"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0024"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0explained i=
n <span class=3D"delete">Section 4.1.</span>=C2=A0 Im=
plementations SHOULD ensure that the BFD</td><td> </td>&l=
t;td class=3D"rblock">=C2=A0 =C2=A0explained in <span class=
=3D"insert">this section.</span>=C2=A0 Implementations S=
HOULD ensure that the</td><td class=3D"lineno"></t=
d></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0packets fol=
low the same lookup path as VXLAN data packets within the</td><td&=
gt; </td><td class=3D"rblock">=C2=A0 =C2=A0BFD packet=
s follow the same lookup path as VXLAN data packets within</td><td=
 class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0sender syst=
em.</td><td> </td><td class=3D"rblock">=
=C2=A0 =C2=A0the sender system.</td><td class=3D"lineno"=
></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0</td><td> </td><td class=3D"rblock&q=
uot;></td><td class=3D"lineno"></td></tr&=
gt;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">4.1.=C2=A0 BFD Packet Encapsulation in VXLAN</span><=
;/td><td> </td><td class=3D"rblock"></td&=
gt;<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0BFD packets a=
re encapsulated in VXLAN as described below.=C2=A0 The VXLAN</td><=
td> </td><td class=3D"right">=C2=A0 =C2=A0BFD pack=
ets are encapsulated in VXLAN as described below.=C2=A0 The VXLAN</td>=
;<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0packet format=
 is defined in Section 5 of [RFC7348].=C2=A0 The Outer IP/UDP</td><=
;td> </td><td class=3D"right">=C2=A0 =C2=A0packet =
format is defined in Section 5 of [RFC7348].=C2=A0 The Outer IP/UDP</td&=
gt;<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0and VXLAN hea=
ders MUST be encoded by the sender as defined in</td><td> </=
td><td class=3D"right">=C2=A0 =C2=A0and VXLAN headers MU=
ST be encoded by the sender as defined in</td><td class=3D"li=
neno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0[RFC7348].<=
;/td><td> </td><td class=3D"right">=C2=A0 =
=C2=A0[RFC7348].</td><td class=3D"lineno"></td>=
</tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A00=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A01=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A02=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A03</td><=
td> </td><td class=3D"right">=C2=A0 =C2=A0 =C2=A00=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A01=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A02=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A03</td>&=
lt;td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A00 1 2 =
3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1</td><td&=
gt; </td><td class=3D"right">=C2=A0 =C2=A0 =C2=A00 1 =
2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1</td><t=
d class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 +-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td> =
</td><td class=3D"right">=C2=A0 =C2=A0 +-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|</td&=
gt;<td> </td><td class=3D"right">=C2=A0 =C2=A0 =
|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0|</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"part-5" class=3D"=
;change"><td></td><th><small>skipping to ch=
ange at</small><a href=3D"https://www=
6.ietf.org/rfcdiff/rfcdiff.pyht#part-5"><em> page 6, line=
 44<span class=3D"hide"> =C2=B6</span></em><=
/a></th><th> </th><th><small>skipping to c=
hange at</small><a href=3D"https://ww=
w6.ietf.org/rfcdiff/rfcdiff.pyht#part-5"><em> page 6, lin=
e 37<span class=3D"hide"> =C2=B6</span></em><=
;/a></th><td></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 +-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td> =
</td><td class=3D"right">=C2=A0 =C2=A0 +-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|</td&=
gt;<td> </td><td class=3D"right">=C2=A0 =C2=A0 =
|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0|</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 ~=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 I=
nner IPvX Header=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 ~</td><td> </td><td class=3D"ri=
ght">=C2=A0 =C2=A0 ~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Inner IPvX Header=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ~</td><=
;td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|</td&=
gt;<td> </td><td class=3D"right">=C2=A0 =C2=A0 =
|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0|</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 +-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td> =
</td><td class=3D"right">=C2=A0 =C2=A0 +-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|</td&=
gt;<td> </td><td class=3D"right">=C2=A0 =C2=A0 =
|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0|</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 ~=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0Inner UDP Header=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 ~</td><td> </td><td class=3D&=
quot;right">=C2=A0 =C2=A0 ~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Inner UDP Header=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ~<=
/td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|</td&=
gt;<td> </td><td class=3D"right">=C2=A0 =C2=A0 =
|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0|</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 +-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td> =
</td><td class=3D"right">=C2=A0 =C2=A0 +-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|</td&=
gt;<td> </td><td class=3D"right">=C2=A0 =C2=A0 =
|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0|</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0025"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 ~=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0BFD Control <span class=3D"delete">Message</span>=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0~</td><td> </td><td class=3D"rblock">=
=C2=A0 =C2=A0 ~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0BFD Control <span class=3D"insert">=
Packet</span>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0~</td><td class=3D"lineno"></t=
d></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|</td&=
gt;<td> </td><td class=3D"right">=C2=A0 =C2=A0 =
|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0|</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 +-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td> =
</td><td class=3D"right">=C2=A0 =C2=A0 +-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 |=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 FCS=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |</td><td&=
gt; </td><td class=3D"right">=C2=A0 =C2=A0 |=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 FCS=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |</td><=
;td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 +-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td> =
</td><td class=3D"right">=C2=A0 =C2=A0 +-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0026"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0<span class=3D"delete">Figure 2: VXLAN Enc=
apsulation of BFD Control Message</span></td><td> </td=
><td class=3D"rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0<span class=3D"insert"> Figure 2: VXLAN Encapsulatio=
n of BFD Control Packet</span></td><td class=3D"lineno&=
quot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0027"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0The BFD pac=
ket MUST be carried inside the inner <span class=3D"delete">=
;MAC</span> frame of the</td><td> </td><td class=
=3D"rblock">=C2=A0 =C2=A0The BFD packet MUST be carried inside=
 the inner <span class=3D"insert">Ethernet</span> fra=
me of the</td><td class=3D"lineno"></td></tr=
>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0VXLAN packe=
t.=C2=A0 The <span class=3D"delete">inner</span> MAC =
frame carrying the BFD <span class=3D"delete">payload</s=
pan> has the</td><td> </td><td class=3D"rblock=
">=C2=A0 =C2=A0VXLAN packet.=C2=A0 The <span class=3D"inser=
t">choice of Destination</span> MAC <span class=3D"in=
sert">and Destination IP</span></td><td class=3D&quo=
t;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0following f=
ormat:</td><td> </td><td class=3D"rblock">=
;<span class=3D"insert">=C2=A0 =C2=A0addresses for the inne=
r Ethernet frame MUST ensure that the BFD</span></td><td cla=
ss=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0Control packet is not forwarded to a tenant but is p=
rocessed locally</span></td><td class=3D"lineno"&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0at the remote VTEP.=C2=A0 The inner Ethernet</spa=
n> frame carrying the BFD</td><td class=3D"lineno">=
;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0<span class=
=3D"insert">Control packet-</span> has the following for=
mat:</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 Ether=
net Header:</td><td> </td><td class=3D"right"=
;>=C2=A0 =C2=A0 =C2=A0 Ethernet Header:</td><td class=3D"l=
ineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0028"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0Destination MAC: This MUST be <span class=3D"delete"=
>the dedicated</span> MAC <span class=3D"delete">T=
BA (Section 8)</span></td><td> </td><td class=3D=
"rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Destination MAC: Th=
is MUST <span class=3D"insert">NOT</span> be <span=
 class=3D"insert">of one of tenant's</span> MAC</=
td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0or the</span> MAC ad=
dress <span class=3D"delete">of</span> the destinatio=
n VTEP.=C2=A0 The details of how</td><td> </td><td cla=
ss=3D"rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<span class=
=3D"insert">addresses.=C2=A0 The destination</span> MAC =
address <span class=3D"insert">MAY be the address</span&=
gt;</td><td class=3D"lineno"></td></tr>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0the MAC address <span class=3D"delete">of the des=
tination VTEP</span> is obtained are outside</td><td> <=
;/td><td class=3D"rblock"><span class=3D"insert&=
quot;>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0associated with</span> the=
 destination VTEP.=C2=A0 The <span class=3D"insert">MAC add=
ress MAY be</span></td><td class=3D"lineno"><=
;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0the scope of this document.</td><td> </td><t=
d class=3D"rblock"><span class=3D"insert">=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0configured, or it MAY be learned via a contr=
ol plane protocol.</span></td><td class=3D"lineno"=
></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The</span> details of how=
 the MAC address is obtained are outside the</td><td class=3D"=
;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0scope of this document.</td><td class=3D"lineno"&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0029"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0Source MAC: MAC address <span class=3D"delete">of=
</span> the originating VTEP</td><td> </td><td c=
lass=3D"rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Source MAC: =
MAC address <span class=3D"insert">associated with</span=
> the originating VTEP</td><td class=3D"lineno">&l=
t;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 IP he=
ader:</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0 =C2=A0 IP header:</td><td class=3D"lineno"=
></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0030"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0<span class=3D"delete">Source</span> IP: IP=
 address of the <span class=3D"delete">originating VTEP.<=
;/span></td><td> </td><td class=3D"rblock"=
;>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<span class=3D"insert"&=
gt;Destination</span> IP: IP address <span class=3D"insert&qu=
ot;>MUST NOT be</span> of <span class=3D"insert">o=
ne of tenant's IP</span></td><td class=3D"lineno&qu=
ot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0addresses.=C2=A0 The IP address=
 SHOULD be selected from the range</span></td><td class=3D&q=
uot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0127/8 for IPv4, for IPv6 - from=
</span> the <span class=3D"insert">range</span>=
</td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A00:0:0:0:0:FFFF:7F00:0/104.=C2=
=A0 Alternatively, the destination IP</span></td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0address MAY be set to VTEP'=
s IP address.</span></td><td class=3D"lineno">&=
lt;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0031"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0<span class=3D"delete">Destination IP: IP address=
 of the term</span>inating VTEP.</td><td> </td><=
td class=3D"rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<span=
 class=3D"insert">Source IP: IP address of the orig</span&g=
t;inating VTEP.</td><td class=3D"lineno"></td>&=
lt;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0032"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0<span class=3D"delete">TTL:</span> MUST be =
set to 1 to ensure that the BFD packet is not</td><td> </td&=
gt;<td class=3D"rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&=
lt;span class=3D"insert">TTL or Hop Limit:</span> MUST b=
e set to 1 to ensure that the BFD</td><td class=3D"lineno&quo=
t;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0routed within the <span class=3D"delete">L3</s=
pan> underlay network.</td><td> </td><td class=3D&q=
uot;rblock">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0packet is not routed =
within the <span class=3D"insert">Layer 3</span> unde=
rlay network.=C2=A0 <span class=3D"insert">This</span>=
;</td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0addresses the scenario when the=
 inner IP destination address is</span></td><td class=3D&quo=
t;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0of VXLAN gateway and there is a=
 router in underlay which</span></td><td class=3D"linen=
o"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0removes the VXLAN header, then =
it is possible to route the</span></td><td class=3D"lin=
eno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0packet as VXLAN=C2=A0 gateway a=
ddress is routable address.</span></td><td class=3D"lin=
eno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0033"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0 =C2=A0 The=
 fields of the UDP header and the BFD <span class=3D"delete"&g=
t;c</span>ontrol packet are</td><td> </td><td cl=
ass=3D"rblock">=C2=A0 =C2=A0 =C2=A0 The fields of the UDP head=
er and the BFD <span class=3D"insert">C</span>ontrol =
packet are</td><td class=3D"lineno"></td></t=
r>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 encod=
ed as specified in [RFC5881].</td><td> </td><td class=
=3D"right">=C2=A0 =C2=A0 =C2=A0 encoded as specified in [RFC58=
81].</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">5.=C2=A0 Reception of BFD =
Packet from VXLAN Tunnel</td><td> </td><td class=3D&qu=
ot;right">5.=C2=A0 Reception of BFD Packet from VXLAN Tunnel</td=
><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Once a packet=
 is received, VTEP MUST validate the packet.=C2=A0 If the</td><td&=
gt; </td><td class=3D"right">=C2=A0 =C2=A0Once a pack=
et is received, VTEP MUST validate the packet.=C2=A0 If the</td><t=
d class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0034"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0Destination=
 MAC of the inner <span class=3D"delete">MAC</span> f=
rame matches <span class=3D"delete">the dedicated MAC or<=
;/span></td><td> </td><td class=3D"rblock"=
;>=C2=A0 =C2=A0Destination MAC of the inner <span class=3D"inser=
t">Ethernet</span> frame matches <span class=3D"inser=
t">one of</span> the MAC</td><td class=3D"linen=
o"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0the MAC <=
;span class=3D"delete">address of</span> the VTEP the pa=
cket MUST be processed further.</td><td> </td><td clas=
s=3D"rblock">=C2=A0 =C2=A0<span class=3D"insert"&=
gt;addresses associated with</span> the VTEP the packet MUST be proce=
ssed</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0further.=C2=A0 &=
lt;span class=3D"insert">If the Destination MAC of the inner E=
thernet frame doesn't</span></td><td class=3D"linen=
o"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0match any of VTEP's MAC addresses, then the proc=
essing of the</span></td><td class=3D"lineno">&=
lt;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0received VXLAN packet MUST follow the procedures des=
cribed in</span></td><td class=3D"lineno"></=
td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0Section 4.1 [RFC7348].</span></td><td=
 class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0The UDP desti=
nation port and the TTL of the inner IP packet MUST be</td><td>=
 </td><td class=3D"right">=C2=A0 =C2=A0The UDP destin=
ation port and the TTL of the inner IP packet MUST be</td><td clas=
s=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0validated to =
determine if the received packet can be processed by</td><td> &=
lt;/td><td class=3D"right">=C2=A0 =C2=A0validated to det=
ermine if the received packet can be processed by</td><td class=3D=
"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0035"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0BFD.=C2=A0 =
BFD <span class=3D"delete">packet</span> with <spa=
n class=3D"delete">inner MAC set to VTEP or dedicated</span=
> MAC address</td><td> </td><td class=3D"rbloc=
k">=C2=A0 =C2=A0BFD.=C2=A0 BFD <span class=3D"insert"&=
gt;Control packets</span> with <span class=3D"insert">=
;unknown</span> MAC address MUST NOT be</td><td class=3D&quo=
t;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0MUST NOT be=
 forwarded to VMs.</td><td> </td><td class=3D"rbl=
ock">=C2=A0 =C2=A0forwarded to VMs.</td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">5.1.=C2=A0 Demultiplexing =
of the BFD Packet</td><td> </td><td class=3D"righ=
t">5.1.=C2=A0 Demultiplexing of the BFD Packet</td><td cla=
ss=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Demultiplexin=
g of IP BFD packet has been defined in Section 3 of</td><td> &l=
t;/td><td class=3D"right">=C2=A0 =C2=A0Demultiplexing of=
 IP BFD packet has been defined in Section 3 of</td><td class=3D&q=
uot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0[RFC5881].=C2=
=A0 Since multiple BFD sessions may be running between two</td><td=
> </td><td class=3D"right">=C2=A0 =C2=A0[RFC5881].=
=C2=A0 Since multiple BFD sessions may be running between two</td><=
;td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0VTEPs, there =
needs to be a mechanism for demultiplexing received BFD</td><td>=
; </td><td class=3D"right">=C2=A0 =C2=A0VTEPs, there =
needs to be a mechanism for demultiplexing received BFD</td><td cl=
ass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0036"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0packets to =
the proper session.=C2=A0 <span class=3D"delete">The proced=
ure for</span> demultiplexing</td><td> </td><td =
class=3D"rblock">=C2=A0 =C2=A0packets to the proper session.=
=C2=A0 <span class=3D"insert">For</span> demultiplexi=
ng packets with Your</td><td class=3D"lineno"></td=
></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0packets wit=
h Your Discriminator equal to <span class=3D"delete">0 is d=
ifferent from</span></td><td> </td><td class=3D&=
quot;rblock">=C2=A0 =C2=A0Discriminator equal to <span class=3D&=
quot;insert">0, a</span> BFD session MUST be identified using=
 the</td><td class=3D"lineno"></td></tr><=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0[RFC5880].=C2=A0 For such packets, the</span=
> BFD session MUST be identified</td><td> </td><td =
class=3D"rblock">=C2=A0 =C2=A0<span class=3D"insert&qu=
ot;>logical link over which</span> the <span class=3D"inse=
rt">BFD Control packet is received.=C2=A0 In</span> the</t=
d><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0using the &=
lt;span class=3D"delete">inner headers, i.e., the source IP,&l=
t;/span> the <span class=3D"delete">destination IP, and&=
lt;/span></td><td> </td><td class=3D"rblock&qu=
ot;>=C2=A0 =C2=A0<span class=3D"insert">case</span>=
; of <span class=3D"insert">VXLAN,</span> the VNI <=
;span class=3D"insert">number identifies that logical link.<=
;/span>=C2=A0 If BFD</td><td class=3D"lineno"><=
/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0the source UDP port number present in the IP he=
ader carried by</span> the</td><td> </td><td cla=
ss=3D"rblock">=C2=A0 =C2=A0packet is received with non-zero Yo=
ur Discriminator, then BFD session</td><td class=3D"lineno&qu=
ot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0<span cl=
ass=3D"delete">payload</span> of the <span class=3D&q=
uot;delete">VXLAN encapsulated packet.=C2=A0 The</span> VNI &=
lt;span class=3D"delete">of the packet</span></td>=
<td> </td><td class=3D"rblock">=C2=A0 =C2=A0MUS=
T be demultiplexed only with Your Discriminator as the key.</td><t=
d class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0SHOULD be used to derive interface-related info=
rmation for</span></td><td> </td><td class=3D&qu=
ot;rblock"></td><td class=3D"lineno"></td&=
gt;</tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0demultiplexing the packet.</span>=C2=A0 I=
f BFD packet is received with non-zero</td><td> </td><=
td class=3D"rblock"></td><td class=3D"lineno&quo=
t;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0Your Discri=
minator, then BFD session MUST be demultiplexed only with</td><td&=
gt; </td><td class=3D"rblock"></td><td class=
=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0Your Discri=
minator as the key.</td><td> </td><td class=3D"rb=
lock"></td><td class=3D"lineno"></td>&l=
t;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">6.=C2=A0 Use of the Specif=
ic VNI</td><td> </td><td class=3D"right">=
6.=C2=A0 Use of the Specific VNI</td><td class=3D"lineno"=
;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0In most cases=
, a single BFD session is sufficient for the given VTEP</td><td>=
; </td><td class=3D"right">=C2=A0 =C2=A0In most cases=
, a single BFD session is sufficient for the given VTEP</td><td cl=
ass=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0to monitor th=
e reachability of a remote VTEP, regardless of the</td><td> <=
;/td><td class=3D"right">=C2=A0 =C2=A0to monitor the rea=
chability of a remote VTEP, regardless of the</td><td class=3D&quo=
t;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0037"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0number of &=
lt;span class=3D"delete">VNIs in common.</span>=C2=A0 Wh=
en the single BFD session is used to</td><td> </td><td=
 class=3D"rblock">=C2=A0 =C2=A0number of <span class=3D&quo=
t;insert">VNIs.</span>=C2=A0 When the single BFD session is u=
sed to monitor the</td><td class=3D"lineno"></td&g=
t;</tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0monitor the=
 reachability of the remote VTEP, an implementation SHOULD</td><td=
> </td><td class=3D"rblock">=C2=A0 =C2=A0reachabil=
ity of the remote VTEP, an implementation SHOULD choose any</td><t=
d class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0choose any =
of the <span class=3D"delete">VNIs but</span> MAY <=
;span class=3D"delete">choose</span> VNI <span class=
=3D"delete">=3D 0.</span></td><td> </td&g=
t;<td class=3D"rblock">=C2=A0 =C2=A0of the <span class=
=3D"insert">VNIs.=C2=A0 An implementation</span> MAY <=
;span class=3D"insert">support the use of the Management</s=
pan></td><td class=3D"lineno"></td></tr&g=
t;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0VNI <span cla=
ss=3D"insert">as control and management channel between VTEPs.=
=C2=A0 The selection</span></td><td class=3D"lineno&quo=
t;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0of the VNI number of the Management VNI MUST be cont=
rolled through</span></td><td class=3D"lineno">=
</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0management plane.=C2=A0 An implementation MAY use VN=
I number 1 as the</span></td><td class=3D"lineno"&=
gt;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0default value for the Management VNI.=C2=A0 All VXLA=
N packets received on</span></td><td class=3D"lineno&qu=
ot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0the Management VNI MUST be processed locally and MUS=
T NOT be</span></td><td class=3D"lineno"></t=
d></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0forwarded to a tenant.</span></td><td=
 class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">7.=C2=A0 Echo BFD</td&g=
t;<td> </td><td class=3D"right">7.=C2=A0 Echo B=
FD</td><td class=3D"lineno"></td></tr>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Support for e=
cho BFD is outside the scope of this document.</td><td> </td=
><td class=3D"right">=C2=A0 =C2=A0Support for echo BFD i=
s outside the scope of this document.</td><td class=3D"lineno=
"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">8.=C2=A0 IANA Consideratio=
ns</td><td> </td><td class=3D"right">8.=
=C2=A0 IANA Considerations</td><td class=3D"lineno">&=
lt;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0038"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0<span cl=
ass=3D"delete">IANA</span> has <span class=3D"de=
lete">assigned TBA as a dedicated MAC address from the</span>=
 IANA <span class=3D"delete">48-bit</span></td>=
<td> </td><td class=3D"rblock">=C2=A0 =C2=A0<=
;span class=3D"insert">This specification</span> has <=
;span class=3D"insert">no</span> IANA <span class=3D&=
quot;insert">action requested.=C2=A0 This section may</span> =
be</td><td class=3D"lineno"></td></tr>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0unicast MAC address registry to</span> be=
 <span class=3D"delete">used as the Destination MAC</spa=
n></td><td> </td><td class=3D"rblock">=
=C2=A0 =C2=A0<span class=3D"insert">deleted before</span=
> the <span class=3D"insert">publication.</span>&l=
t;/td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0address of</span> the <span class=3D&q=
uot;delete">inner Ethernet of VXLAN when carrying BFD control</s=
pan></td><td> </td><td class=3D"rblock"&g=
t;</td><td class=3D"lineno"></td></tr>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"><span class=3D"d=
elete">=C2=A0 =C2=A0packets.</span></td><td> <=
/td><td class=3D"rblock"></td><td class=3D"=
;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">9.=C2=A0 Security Consider=
ations</td><td> </td><td class=3D"right">=
9.=C2=A0 Security Considerations</td><td class=3D"lineno"=
;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0The document =
requires setting the inner IP TTL to 1, which could be</td><td>=
 </td><td class=3D"right">=C2=A0 =C2=A0The document r=
equires setting the inner IP TTL to 1, which could be</td><td clas=
s=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0used as a DDo=
S attack vector.=C2=A0 Thus the implementation MUST have</td><td&g=
t; </td><td class=3D"right">=C2=A0 =C2=A0used as a DD=
oS attack vector.=C2=A0 Thus the implementation MUST have</td><td =
class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0039"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0throttling =
in place to control the rate of BFD <span class=3D"delete">=
control</span> packets sent</td><td> </td><td cl=
ass=3D"rblock">=C2=A0 =C2=A0throttling in place to control the=
 rate of BFD <span class=3D"insert">Control</span> pa=
ckets sent</td><td class=3D"lineno"></td></t=
r>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0to the cont=
rol plane.=C2=A0 <span class=3D"delete">Throttling MAY be r=
elaxed for</span> BFD packets</td><td> </td><td =
class=3D"rblock">=C2=A0 =C2=A0to the control plane.=C2=A0 <=
span class=3D"insert">On the other hand, over-aggressive throt=
tling</span></td><td class=3D"lineno"></td&g=
t;</tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0<span cl=
ass=3D"delete">based on port number.</span></td>&l=
t;td> </td><td class=3D"rblock"><span class=3D&=
quot;insert">=C2=A0 =C2=A0of BFD Control packets may become the cau=
se of the inability to form</span></td><td class=3D"lin=
eno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0and maintain BFD session at scale.=C2=A0 Hence, thro=
ttling of</span> BFD <span class=3D"insert">Control&l=
t;/span></td><td class=3D"lineno"></td></=
tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0packets <span=
 class=3D"insert">SHOULD be adjusted to permit BFD to work acc=
ording to its</span></td><td class=3D"lineno">&=
lt;/td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0procedures.</span></td><td class=3D&q=
uot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0040"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0<span cl=
ass=3D"delete">The</span> implementation SHOULD <span=
 class=3D"delete">have</span> a <span class=3D"d=
elete">reasonable upper bound on</span> the number</td>=
<td> </td><td class=3D"rblock">=C2=A0 =C2=A0<=
;span class=3D"insert">If the</span> implementation <=
span class=3D"insert">supports establishing multiple BFD sessi=
ons</span></td><td class=3D"lineno"></td>=
</tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0of <span=
 class=3D"delete">BFD</span> sessions that can be <sp=
an class=3D"delete">created between</span> the same <=
span class=3D"delete">pair of VTEPs.</span></td>&l=
t;td> </td><td class=3D"rblock"><span class=3D&=
quot;insert">=C2=A0 =C2=A0between the same pair of VTEPs, there<=
/span> SHOULD <span class=3D"insert">be</span> a &=
lt;span class=3D"insert">mechanism to</span></td>&=
lt;td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock"><span class=3D"insert=
">=C2=A0 =C2=A0control</span> the <span class=3D"inse=
rt">maximum</span> number of <span class=3D"insert&qu=
ot;>such</span> sessions that can be <span class=3D"insert=
">active at</span> the</td><td class=3D"lineno&=
quot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock"></td><td> &l=
t;/td><td class=3D"rblock">=C2=A0 =C2=A0same <span cl=
ass=3D"insert">time.</span></td><td class=3D&qu=
ot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Other than in=
ner IP TTL set to 1 and limit the number of BFD sessions</td><td&g=
t; </td><td class=3D"right">=C2=A0 =C2=A0Other than i=
nner IP TTL set to 1 and limit the number of BFD sessions</td><td =
class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0between the s=
ame pair of VTEPs, this specification does not raise any</td><td&g=
t; </td><td class=3D"right">=C2=A0 =C2=A0between the =
same pair of VTEPs, this specification does not raise any</td><td =
class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0additional se=
curity issues beyond those of the specifications</td><td> </=
td><td class=3D"right">=C2=A0 =C2=A0additional security =
issues beyond those of the specifications</td><td class=3D"li=
neno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0referred to i=
n the list of normative references.</td><td> </td><td =
class=3D"right">=C2=A0 =C2=A0referred to in the list of normat=
ive references.</td><td class=3D"lineno"></td>&=
lt;/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">10.=C2=A0 Contributors<=
/td><td> </td><td class=3D"right">10.=C2=A0 =
Contributors</td><td class=3D"lineno"></td><=
/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Reshad Rahman=
</td><td> </td><td class=3D"right">=C2=A0=
 =C2=A0Reshad Rahman</td><td class=3D"lineno"></td=
></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0rrahman@cisco.com</td>&=
lt;td> </td><td class=3D"right">=C2=A0 =C2=A0rrahman@cisco.com<=
/td><td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"part-6" class=3D"=
;change"><td></td><th><small>skipping to ch=
ange at</small><a href=3D"https://www=
6.ietf.org/rfcdiff/rfcdiff.pyht#part-6"><em> page 10, lin=
e 14<span class=3D"hide"> =C2=B6</span></em><=
;/a></th><th> </th><th><small>skipping to =
change at</small><a href=3D"https://w=
ww6.ietf.org/rfcdiff/rfcdiff.pyht#part-6"><em> page 10, l=
ine 33<span class=3D"hide"> =C2=B6</span></em>&=
lt;/a></th><td></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0[RFC8365]=C2=
=A0 Sajassi, A., Ed., Drake, J., Ed., Bitar, N., Shekhar, R.,</td><=
;td> </td><td class=3D"right">=C2=A0 =C2=A0[RFC836=
5]=C2=A0 Sajassi, A., Ed., Drake, J., Ed., Bitar, N., Shekhar, R.,</td&g=
t;<td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 Uttaro, J., and W. Henderickx, "A Network Vir=
tualization</td><td> </td><td class=3D"right"=
;>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Uttaro, J., and W. He=
nderickx, "A Network Virtualization</td><td class=3D"lin=
eno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 Overlay Solution Using Ethernet VPN (EVPN)", =
RFC 8365,</td><td> </td><td class=3D"right"&=
gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Overlay Solution Using =
Ethernet VPN (EVPN)", RFC 8365,</td><td class=3D"lineno&=
quot;></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 DOI 10.17487/RFC8365, March 2018,</td><td=
> </td><td class=3D"right">=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 DOI 10.17487/RFC8365, March 2018,</td><=
;td class=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 &lt;https://www.rfc-edit=
or.org/info/rfc8365&gt;.</td><td> </td><td cla=
ss=3D"right">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
&lt;https://www.rfc-editor.org/info/rfc8365&g=
t;.</td><td class=3D"lineno"></td></tr&g=
t;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">Authors' Addresses<=
/td><td> </td><td class=3D"right">Authors=
9; Addresses</td><td class=3D"lineno"></td><=
/tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Santosh Palla=
gatti (editor)</td><td> </td><td class=3D"right&q=
uot;>=C2=A0 =C2=A0Santosh Pallagatti (editor)</td><td class=3D&=
quot;lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr id=3D"diff0041"><td&g=
t;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"lblock">=C2=A0 =C2=A0<span cl=
ass=3D"delete">Rtbrick</span></td><td> </=
td><td class=3D"rblock">=C2=A0 =C2=A0<span class=3D&q=
uot;insert">VMware</span></td><td class=3D"line=
no"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Email: santosh.pallaga=
tti@gmail.com</td><td> </td><td class=3D"righ=
t">=C2=A0 =C2=A0Email: santosh.pallagatti@gmail.com</td><td cla=
ss=3D"lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Sudarsan Para=
giri</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0Sudarsan Paragiri</td><td class=3D"lineno"&=
gt;</td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Individual Co=
ntributor</td><td> </td><td class=3D"right"&=
gt;=C2=A0 =C2=A0Individual Contributor</td><td class=3D"linen=
o"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Email: sudarsan.225@gmail.co=
m</td><td> </td><td class=3D"right">=
=C2=A0 =C2=A0Email: sudarsan.225@gmail.com</td><td class=3D"lineno"=
></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left"></td><td> <=
/td><td class=3D"right"></td><td class=3D"=
lineno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Vengada Prasa=
d Govindan</td><td> </td><td class=3D"right"=
>=C2=A0 =C2=A0Vengada Prasad Govindan</td><td class=3D"lin=
eno"></td></tr>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0<tr><td class=3D"lineno"&=
gt;</td><td class=3D"left">=C2=A0 =C2=A0Cisco</td&=
gt;<td> </td><td class=3D"right">=C2=A0 =C2=A0C=
isco</td><td class=3D"lineno"></td></tr><=
br>
> 

>=C2=A0 =C2=A0 =C2=A0 <tr><td></td><td class=3D&quo=
t;left"></td><td> </td><td class=3D"right=
"></td><td></td></tr>

>=C2=A0 =C2=A0 =C2=A0 <tr id=3D"end" bgcolor=3D"gray&q=
uot;><th colspan=3D"5" align=3D"center">&n=
bsp;End of changes. 41 change blocks.&nbsp;</th></tr>

>=C2=A0 =C2=A0 =C2=A0 <tr class=3D"stats"><td><=
/td><th><i>76 lines changed or deleted</i></th>&=
lt;th><i> </i></th><th><i>112 lines change=
d or added</i></th><td></td></tr>

>=C2=A0 =C2=A0 =C2=A0 <tr><td colspan=3D"5" align=3D&=
quot;center" class=3D"small"><br>This html diff was=
 produced by rfcdiff 1.47. The latest version is available from <a href=
=3D"http://www.tools.ietf.org/tools/rfcdiff/"&=
gt;http://tools.ietf.org/tools/rfcdiff/</a> </td>=
;</tr>

>=C2=A0 =C2=A0 </tbody></table>

>=C2=A0 =C2=A0 

>=C2=A0 =C2=A0 

> </body></html>




--000000000000939187059626ff41--


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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Greg Mirsky , Selvakumar Sivaraj 
Cc: Dinesh Dutt , NVO3 , "draft-ietf-bfd-vxlan@ietf.org" , Anoop Ghanwani , Santosh P K , Jeffrey Haas , rtg-bfd WG , "T. Sridhar" , "xiao.min2@zte.com.cn" 
References:      <97bdb8b4-b334-53fb-05a6-2d1fc8684ad3@joelhalpern.com>   <1572400778.28051.7@smtp.gmail.com>  <1a38424c-6bc1-4414-a7fd-c1e2105b581a@Spark>  <1572435956.28051.12@smtp.gmail.com>  <73C65A84-D59F-42AA-A2BA-5DE6946DC6D8@juniper.net> 
From: "Joel M. Halpern" 
Message-ID: <80ac8114-a56a-a344-aaad-4ddec801d193@joelhalpern.com>
Date: Wed, 30 Oct 2019 16:58:58 -0400
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From nobody Wed Oct 30 14:23:29 2019
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Date: Wed, 30 Oct 2019 17:17:42 -0400
From: Jeffrey Haas 
To: Greg Mirsky 
Cc: Dinesh Dutt , Anoop Ghanwani , "Joel M. Halpern" , Santosh P K , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
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Greg,

On Wed, Oct 30, 2019 at 01:58:30PM -0700, Greg Mirsky wrote:
> On Wed, Oct 30, 2019 at 1:27 PM Jeffrey Haas  wrote:
> 
> > Greg,
> >
> > From the updated text:
> >
> > "At the same time, a service layer BFD session may be used between the
> > tenants of VTEPs IP1 and IP2 to provide end-to-end fault management. In
> > such case, for VTEPs BFD Control packets of that session are
> > indistinguishable from data packets.  If end-to-end defect detection is
> > realized as the set of concatenated OAM domains, e.g., VM1-1 - IP1 --
> > IP2 - VM2-1, then the BFD session over VXLAN between VTEPs SHOULD
> > follow the procedures described in Section 6.8.17 [RFC5880]."
> >
> > In the case that two VMs are running BFD to each other as a user
> > application
> > rather than as part of the virtualized environment, it's unlikely that
> > they'd be treated as concatenated domains.  To do so, the tenant VMs would
> > have to have a sense that they are indeed virtual.
> >
> > Is your intent in this text that BFD implementations on the server should
> > detect BFD sessions between servers and change them to a concatenated
> > session?
> >
> GIM>> No, we do not suggest that the concatenation of BFD sessions be
> automagical. That may be controlled via the management plane though.

Then my suggestion is we may not want this text.

It's fine to say "if tenants want to run BFD to each other, and that is
standard BFD (RFC 5881) from the perspective of those tenants" if that's
your intent.  Leave automagic out of the spec. :-)

> > Section 5 comment:
> >
> > :   The UDP destination port and the TTL of the inner IP packet MUST be
> > :   validated to determine if the received packet can be processed by
> > :   BFD.  BFD Control packets with unknown MAC address MUST NOT be
> > :   forwarded to VMs.
> >
> > I'd suggest pushing the second sentence into the prior section since it
> > deals with MAC addresses rather than the UDP procedures.
> >
> GIM>> Could you please clarify your suggestion - move to Section 4 or to
> the preceding paragraph? I think it is the latter but wanted to make sure.

Full section 5 from your draft-8 candidate:
: 5.  Reception of BFD Packet from VXLAN Tunnel
: 
:    Once a packet is received, the VTEP MUST validate the packet.  If the
:    Destination MAC of the inner Ethernet frame matches one of the MAC
:    addresses associated with the VTEP the packet MUST be processed
:    further.  If the Destination MAC of the inner Ethernet frame doesn't
:    match any of VTEP's MAC addresses, then the processing of the
:    received VXLAN packet MUST follow the procedures described in
:    Section 4.1 [RFC7348].

It's not clear what that procedure is, with respect to BFD.  Section 4.1
basically says is that when a mapping is discovered, deliver it to that VM
with headers removed.

Section 4.1 really doesn't discuss dropping behavior.

: 
:    The UDP destination port and the TTL of the inner IP packet MUST be
:    validated to determine if the received packet can be processed by
:    BFD.

This is fine.

:    BFD Control packets with unknown MAC address MUST NOT be
:    forwarded to VMs.

This appears to be clarifying the missing point in the prior paragraph.  If
that's the case, why is this sentence not part of the prior paragraph?


-- Jeff


From nobody Wed Oct 30 20:00:15 2019
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From: Selvakumar Sivaraj 
To: Greg Mirsky 
CC: Dinesh Dutt , NVO3 , "draft-ietf-bfd-vxlan@ietf.org" , Anoop Ghanwani , Santosh P K , Jeffrey Haas , rtg-bfd WG , "Joel M. Halpern" , "T. Sridhar" , "xiao.min2@zte.com.cn" 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
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From: Greg Mirsky 
Date: Thu, 31 Oct 2019 08:48:08 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Jeffrey Haas 
Cc: Dinesh Dutt , Anoop Ghanwani ,  "Joel M. Halpern" , Santosh P K , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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--00000000000057e235059636c798
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Hi Jeff,
thank you for the detailed clarification of your questions. Please find my
follow-up notes in-lined tagged GIM2>>.

Regards,
Greg

On Wed, Oct 30, 2019 at 2:14 PM Jeffrey Haas  wrote:

> Greg,
>
> On Wed, Oct 30, 2019 at 01:58:30PM -0700, Greg Mirsky wrote:
> > On Wed, Oct 30, 2019 at 1:27 PM Jeffrey Haas  wrote:
> >
> > > Greg,
> > >
> > > From the updated text:
> > >
> > > "At the same time, a service layer BFD session may be used between the
> > > tenants of VTEPs IP1 and IP2 to provide end-to-end fault management. In
> > > such case, for VTEPs BFD Control packets of that session are
> > > indistinguishable from data packets.  If end-to-end defect detection is
> > > realized as the set of concatenated OAM domains, e.g., VM1-1 - IP1 --
> > > IP2 - VM2-1, then the BFD session over VXLAN between VTEPs SHOULD
> > > follow the procedures described in Section 6.8.17 [RFC5880]."
> > >
> > > In the case that two VMs are running BFD to each other as a user
> > > application
> > > rather than as part of the virtualized environment, it's unlikely that
> > > they'd be treated as concatenated domains.  To do so, the tenant VMs
> would
> > > have to have a sense that they are indeed virtual.
> > >
> > > Is your intent in this text that BFD implementations on the server
> should
> > > detect BFD sessions between servers and change them to a concatenated
> > > session?
> > >
> > GIM>> No, we do not suggest that the concatenation of BFD sessions be
> > automagical. That may be controlled via the management plane though.
>
> Then my suggestion is we may not want this text.
>
> It's fine to say "if tenants want to run BFD to each other, and that is
> standard BFD (RFC 5881) from the perspective of those tenants" if that's
> your intent.  Leave automagic out of the spec. :-)
>
GIM2>> I'd take the passage referring to the concatenated path out. That
will leave it as:
   At the same time, a service layer BFD session may be used between the
   tenants of VTEPs IP1 and IP2 to provide end-to-end fault management.
   In such case, for VTEPs BFD Control packets of that session are
   indistinguishable from data packets.

>
> > > Section 5 comment:
> > >
> > > :   The UDP destination port and the TTL of the inner IP packet MUST be
> > > :   validated to determine if the received packet can be processed by
> > > :   BFD.  BFD Control packets with unknown MAC address MUST NOT be
> > > :   forwarded to VMs.
> > >
> > > I'd suggest pushing the second sentence into the prior section since it
> > > deals with MAC addresses rather than the UDP procedures.
> > >
> > GIM>> Could you please clarify your suggestion - move to Section 4 or to
> > the preceding paragraph? I think it is the latter but wanted to make
> sure.
>
> Full section 5 from your draft-8 candidate:
> : 5.  Reception of BFD Packet from VXLAN Tunnel
> :
> :    Once a packet is received, the VTEP MUST validate the packet.  If the
> :    Destination MAC of the inner Ethernet frame matches one of the MAC
> :    addresses associated with the VTEP the packet MUST be processed
> :    further.  If the Destination MAC of the inner Ethernet frame doesn't
> :    match any of VTEP's MAC addresses, then the processing of the
> :    received VXLAN packet MUST follow the procedures described in
> :    Section 4.1 [RFC7348].
>
> It's not clear what that procedure is, with respect to BFD.  Section 4.1
> basically says is that when a mapping is discovered, deliver it to that VM
> with headers removed.
>
> Section 4.1 really doesn't discuss dropping behavior.
>
> :
> :    The UDP destination port and the TTL of the inner IP packet MUST be
> :    validated to determine if the received packet can be processed by
> :    BFD.
>
> This is fine.
>
> :    BFD Control packets with unknown MAC address MUST NOT be
> :    forwarded to VMs.
>
> This appears to be clarifying the missing point in the prior paragraph.  If
> that's the case, why is this sentence not part of the prior paragraph?
>
GIM>> So I thought. Moving the sentence to the first paragraph highlighted
the contradiction others had pointed earlier:
On the one hand:
   If the Destination MAC of the inner Ethernet frame doesn't
   match any of VTEP's MAC addresses, then the processing of the
   received VXLAN packet MUST follow the procedures described in
   Section 4.1 [RFC7348].
To which we add:
   BFD Control packets with unknown MAC address
   MUST NOT be forwarded to VMs.
But the unknown MACs are treated as BUM according to the last paragraph in
Section 4.2 of RFC 7348:
   Note that multicast frames and "unknown MAC destination" frames are
   also sent using the multicast tree, similar to the broadcast frames.
In light of that, can this draft require that BFD packets with unknown MAC
be dropped and not flooded over the corresponding to the VNI domain? I
think that in addition to moving the sentence up the statement must be
updated:
OLD TEXT:
   BFD Control packets with unknown MAC address
   MUST NOT be forwarded to VMs.
NEW TEXT:
   If the BFD session is using the Management VNI (Section 6),
   BFD Control packets with unknown MAC address
   MUST NOT be forwarded to VMs.
 Comments? Suggestions?

>
>
> -- Jeff
>

--00000000000057e235059636c798
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Jeff,
thank you for the detailed c=
larification of your questions. Please find my follow-up notes in-lined tag=
ged GIM2>>.

Regards,
Greg

On =
Wed, Oct 30, 2019 at 2:14 PM Jeffrey Haas <jhaas@pfrc.org> wrote:
Greg,



On Wed, Oct 30, 2019 at 01:58:30PM -0700, Greg Mirsky wrote:

> On Wed, Oct 30, 2019 at 1:27 PM Jeffrey Haas <jhaas@pfrc.org> wrote:

> 

> > Greg,

> >

> > From the updated text:

> >

> > "At the same time, a service layer BFD session may be used b=
etween the

> > tenants of VTEPs IP1 and IP2 to provide end-to-end fault manageme=
nt. In

> > such case, for VTEPs BFD Control packets of that session are

> > indistinguishable from data packets.=C2=A0 If end-to-end defect d=
etection is

> > realized as the set of concatenated OAM domains, e.g., VM1-1 - IP=
1 --

> > IP2 - VM2-1, then the BFD session over VXLAN between VTEPs SHOULD=


> > follow the procedures described in Section 6.8.17 [RFC5880]."=
;

> >

> > In the case that two VMs are running BFD to each other as a user<=
br>
> > application

> > rather than as part of the virtualized environment, it's unli=
kely that

> > they'd be treated as concatenated domains.=C2=A0 To do so, th=
e tenant VMs would

> > have to have a sense that they are indeed virtual.

> >

> > Is your intent in this text that BFD implementations on the serve=
r should

> > detect BFD sessions between servers and change them to a concaten=
ated

> > session?

> >

> GIM>> No, we do not suggest that the concatenation of BFD sessio=
ns be

> automagical. That may be controlled via the management plane though.


Then my suggestion is we may not want this text.



It's fine to say "if tenants want to run BFD to each other, and th=
at is

standard BFD (RFC 5881) from the perspective of those tenants" if that=
's

your intent.=C2=A0 Leave automagic out of the spec. :-)
GIM2>> I'd take the passage referring to the concatenated path =
out. That will leave it as:
=C2=A0 =C2=A0At the same time, a serv=
ice layer BFD session may be used between the
=C2=A0 =C2=A0tenants of VT=
EPs IP1 and IP2 to provide end-to-end fault management.
=C2=A0 =C2=A0In =
such case, for VTEPs BFD Control packets of that session are
=C2=A0 =C2=
=A0indistinguishable from data packets.



> > Section 5 comment:

> >

> > :=C2=A0 =C2=A0The UDP destination port and the TTL of the inner I=
P packet MUST be

> > :=C2=A0 =C2=A0validated to determine if the received packet can b=
e processed by

> > :=C2=A0 =C2=A0BFD.=C2=A0 BFD Control packets with unknown MAC add=
ress MUST NOT be

> > :=C2=A0 =C2=A0forwarded to VMs.

> >

> > I'd suggest pushing the second sentence into the prior sectio=
n since it

> > deals with MAC addresses rather than the UDP procedures.

> >

> GIM>> Could you please clarify your suggestion - move to Section=
 4 or to

> the preceding paragraph? I think it is the latter but wanted to make s=
ure.



Full section 5 from your draft-8 candidate:

: 5.=C2=A0 Reception of BFD Packet from VXLAN Tunnel

: 

:=C2=A0 =C2=A0 Once a packet is received, the VTEP MUST validate the packet=
.=C2=A0 If the

:=C2=A0 =C2=A0 Destination MAC of the inner Ethernet frame matches one of t=
he MAC

:=C2=A0 =C2=A0 addresses associated with the VTEP the packet MUST be proces=
sed

:=C2=A0 =C2=A0 further.=C2=A0 If the Destination MAC of the inner Ethernet =
frame doesn't

:=C2=A0 =C2=A0 match any of VTEP's MAC addresses, then the processing o=
f the

:=C2=A0 =C2=A0 received VXLAN packet MUST follow the procedures described i=
n

:=C2=A0 =C2=A0 Section 4.1 [RFC7348].



It's not clear what that procedure is, with respect to BFD.=C2=A0 Secti=
on 4.1

basically says is that when a mapping is discovered, deliver it to that VM<=
br>
with headers removed.



Section 4.1 really doesn't discuss dropping behavior.



: 

:=C2=A0 =C2=A0 The UDP destination port and the TTL of the inner IP packet =
MUST be

:=C2=A0 =C2=A0 validated to determine if the received packet can be process=
ed by

:=C2=A0 =C2=A0 BFD.



This is fine.



:=C2=A0 =C2=A0 BFD Control packets with unknown MAC address MUST NOT be

:=C2=A0 =C2=A0 forwarded to VMs.



This appears to be clarifying the missing point in the prior paragraph.=C2=
=A0 If

that's the case, why is this sentence not part of the prior paragraph?<=
br>
GIM>> So I thought. Moving the sentence to the f=
irst paragraph highlighted the contradiction others had pointed earlier:
On the one hand:
=C2=A0 =C2=A0If the Destination MAC of t=
he inner Ethernet frame doesn't
=C2=A0 =C2=A0match any of VTEP's=
 MAC addresses, then the processing of the
=C2=A0 =C2=A0received VXLAN p=
acket MUST follow the procedures described in
=C2=A0 =C2=A0Section 4.1 [=
RFC7348].
To which we add:
=C2=A0 =C2=A0BFD Control=
 packets with unknown MAC address
=C2=A0 =C2=A0MUST NOT be forwarded to =
VMs.
But the unknown MACs are treated as BUM according to the=
 last paragraph in Section 4.2 of RFC 7348:
=C2=A0 =C2=A0Note tha=
t multicast frames and "unknown MAC destination" frames are
=
=C2=A0 =C2=A0also sent using the multicast tree, similar to the broadcast f=
rames.
In light of that, can this draft require that BFD pack=
ets with unknown MAC be dropped and not flooded over the corresponding to t=
he VNI domain? I think that in addition to moving the sentence up the state=
ment must be updated:
OLD TEXT:
=C2=A0 =C2=A0BFD Contro=
l packets with unknown MAC address
=C2=A0 =C2=A0MUST NOT be forwarded to=
 VMs.
NEW TEXT:
=C2=A0 =C2=A0If the BFD session is =
using the Management VNI (Section 6),
=C2=A0 =C2=A0BFD Control pa=
ckets with unknown MAC address
=C2=A0 =C2=A0MUST NOT be forwarded to VMs=
.
=C2=A0Comments? Suggestions?





-- Jeff




--00000000000057e235059636c798--


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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
From: Jeffrey Haas 
In-Reply-To: <34b67556-a405-e4d7-7f72-d097f1201860@joelhalpern.com>
Date: Thu, 31 Oct 2019 12:21:59 -0400
Cc: Greg Mirsky , Dinesh Dutt , Anoop Ghanwani , Santosh P K , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
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I also agree with Joel.

-- Jeff


> On Oct 31, 2019, at 11:59 AM, Joel M. Halpern  =
wrote:
>=20
> Explicitly restricting the discard behavior to the management VNI =
takes care of my concern.
>=20
> Thank you,
> Joel
>=20
> On 10/31/2019 11:48 AM, Greg Mirsky wrote:
>> Hi Jeff,
>> thank you for the detailed clarification of your questions. Please =
find my follow-up notes in-lined tagged GIM2>>.
>> Regards,
>> Greg
>> On Wed, Oct 30, 2019 at 2:14 PM Jeffrey Haas > wrote:
>>    Greg,
>>    On Wed, Oct 30, 2019 at 01:58:30PM -0700, Greg Mirsky wrote:
>>     > On Wed, Oct 30, 2019 at 1:27 PM Jeffrey Haas >    > wrote:
>>     >
>>     > > Greg,
>>     > >
>>     > > =46rom the updated text:
>>     > >
>>     > > "At the same time, a service layer BFD session may be used
>>    between the
>>     > > tenants of VTEPs IP1 and IP2 to provide end-to-end fault
>>    management. In
>>     > > such case, for VTEPs BFD Control packets of that session are
>>     > > indistinguishable from data packets.  If end-to-end defect
>>    detection is
>>     > > realized as the set of concatenated OAM domains, e.g., VM1-1 =
-
>>    IP1 --
>>     > > IP2 - VM2-1, then the BFD session over VXLAN between VTEPs =
SHOULD
>>     > > follow the procedures described in Section 6.8.17 [RFC5880]."
>>     > >
>>     > > In the case that two VMs are running BFD to each other as a =
user
>>     > > application
>>     > > rather than as part of the virtualized environment, it's
>>    unlikely that
>>     > > they'd be treated as concatenated domains.  To do so, the
>>    tenant VMs would
>>     > > have to have a sense that they are indeed virtual.
>>     > >
>>     > > Is your intent in this text that BFD implementations on the
>>    server should
>>     > > detect BFD sessions between servers and change them to a
>>    concatenated
>>     > > session?
>>     > >
>>     > GIM>> No, we do not suggest that the concatenation of BFD =
sessions be
>>     > automagical. That may be controlled via the management plane =
though.
>>    Then my suggestion is we may not want this text.
>>    It's fine to say "if tenants want to run BFD to each other, and =
that is
>>    standard BFD (RFC 5881) from the perspective of those tenants" if =
that's
>>    your intent.  Leave automagic out of the spec. :-)
>> GIM2>> I'd take the passage referring to the concatenated path out. =
That will leave it as:
>>    At the same time, a service layer BFD session may be used between =
the
>>    tenants of VTEPs IP1 and IP2 to provide end-to-end fault =
management.
>>    In such case, for VTEPs BFD Control packets of that session are
>>    indistinguishable from data packets.
>>     > > Section 5 comment:
>>     > >
>>     > > :   The UDP destination port and the TTL of the inner IP =
packet
>>    MUST be
>>     > > :   validated to determine if the received packet can be
>>    processed by
>>     > > :   BFD.  BFD Control packets with unknown MAC address MUST =
NOT be
>>     > > :   forwarded to VMs.
>>     > >
>>     > > I'd suggest pushing the second sentence into the prior =
section
>>    since it
>>     > > deals with MAC addresses rather than the UDP procedures.
>>     > >
>>     > GIM>> Could you please clarify your suggestion - move to =
Section
>>    4 or to
>>     > the preceding paragraph? I think it is the latter but wanted to
>>    make sure.
>>    Full section 5 from your draft-8 candidate:
>>    : 5.  Reception of BFD Packet from VXLAN Tunnel
>>    :
>>    :    Once a packet is received, the VTEP MUST validate the packet. =
    If the
>>    :    Destination MAC of the inner Ethernet frame matches one of =
the MAC
>>    :    addresses associated with the VTEP the packet MUST be =
processed
>>    :    further.  If the Destination MAC of the inner Ethernet frame
>>    doesn't
>>    :    match any of VTEP's MAC addresses, then the processing of the
>>    :    received VXLAN packet MUST follow the procedures described in
>>    :    Section 4.1 [RFC7348].
>>    It's not clear what that procedure is, with respect to BFD.  =
Section 4.1
>>    basically says is that when a mapping is discovered, deliver it to
>>    that VM
>>    with headers removed.
>>    Section 4.1 really doesn't discuss dropping behavior.
>>    :
>>    :    The UDP destination port and the TTL of the inner IP packet =
MUST be
>>    :    validated to determine if the received packet can be =
processed by
>>    :    BFD.
>>    This is fine.
>>    :    BFD Control packets with unknown MAC address MUST NOT be
>>    :    forwarded to VMs.
>>    This appears to be clarifying the missing point in the prior
>>    paragraph.  If
>>    that's the case, why is this sentence not part of the prior =
paragraph?
>> GIM>> So I thought. Moving the sentence to the first paragraph =
highlighted the contradiction others had pointed earlier:
>> On the one hand:
>>    If the Destination MAC of the inner Ethernet frame doesn't
>>    match any of VTEP's MAC addresses, then the processing of the
>>    received VXLAN packet MUST follow the procedures described in
>>    Section 4.1 [RFC7348].
>> To which we add:
>>    BFD Control packets with unknown MAC address
>>    MUST NOT be forwarded to VMs.
>> But the unknown MACs are treated as BUM according to the last =
paragraph in Section 4.2 of RFC 7348:
>>    Note that multicast frames and "unknown MAC destination" frames =
are
>>    also sent using the multicast tree, similar to the broadcast =
frames.
>> In light of that, can this draft require that BFD packets with =
unknown MAC be dropped and not flooded over the corresponding to the VNI =
domain? I think that in addition to moving the sentence up the statement =
must be updated:
>> OLD TEXT:
>>    BFD Control packets with unknown MAC address
>>    MUST NOT be forwarded to VMs.
>> NEW TEXT:
>>    If the BFD session is using the Management VNI (Section 6),
>>    BFD Control packets with unknown MAC address
>>    MUST NOT be forwarded to VMs.
>>  Comments? Suggestions?
>>    -- Jeff


From nobody Thu Oct 31 09:22:37 2019
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Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Greg Mirsky , Jeffrey Haas 
Cc: Dinesh Dutt , Anoop Ghanwani , Santosh P K , NVO3 , draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG , "T. Sridhar" , xiao.min2@zte.com.cn
References:   <1572400778.28051.7@smtp.gmail.com>  <1a38424c-6bc1-4414-a7fd-c1e2105b581a@Spark>  <1572435956.28051.12@smtp.gmail.com>  <20191030203051.GD10145@pfrc.org>  <20191030211742.GE10145@pfrc.org> 
From: "Joel M. Halpern" 
Message-ID: <34b67556-a405-e4d7-7f72-d097f1201860@joelhalpern.com>
Date: Thu, 31 Oct 2019 11:59:14 -0400
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Explicitly restricting the discard behavior to the management VNI takes 
care of my concern.

Thank you,
Joel

On 10/31/2019 11:48 AM, Greg Mirsky wrote:
> Hi Jeff,
> thank you for the detailed clarification of your questions. Please find 
> my follow-up notes in-lined tagged GIM2>>.
> 
> Regards,
> Greg
> 
> On Wed, Oct 30, 2019 at 2:14 PM Jeffrey Haas  > wrote:
> 
>     Greg,
> 
>     On Wed, Oct 30, 2019 at 01:58:30PM -0700, Greg Mirsky wrote:
>      > On Wed, Oct 30, 2019 at 1:27 PM Jeffrey Haas      > wrote:
>      >
>      > > Greg,
>      > >
>      > > From the updated text:
>      > >
>      > > "At the same time, a service layer BFD session may be used
>     between the
>      > > tenants of VTEPs IP1 and IP2 to provide end-to-end fault
>     management. In
>      > > such case, for VTEPs BFD Control packets of that session are
>      > > indistinguishable from data packets.  If end-to-end defect
>     detection is
>      > > realized as the set of concatenated OAM domains, e.g., VM1-1 -
>     IP1 --
>      > > IP2 - VM2-1, then the BFD session over VXLAN between VTEPs SHOULD
>      > > follow the procedures described in Section 6.8.17 [RFC5880]."
>      > >
>      > > In the case that two VMs are running BFD to each other as a user
>      > > application
>      > > rather than as part of the virtualized environment, it's
>     unlikely that
>      > > they'd be treated as concatenated domains.  To do so, the
>     tenant VMs would
>      > > have to have a sense that they are indeed virtual.
>      > >
>      > > Is your intent in this text that BFD implementations on the
>     server should
>      > > detect BFD sessions between servers and change them to a
>     concatenated
>      > > session?
>      > >
>      > GIM>> No, we do not suggest that the concatenation of BFD sessions be
>      > automagical. That may be controlled via the management plane though.
> 
>     Then my suggestion is we may not want this text.
> 
>     It's fine to say "if tenants want to run BFD to each other, and that is
>     standard BFD (RFC 5881) from the perspective of those tenants" if that's
>     your intent.  Leave automagic out of the spec. :-)
> 
> GIM2>> I'd take the passage referring to the concatenated path out. That 
> will leave it as:
>     At the same time, a service layer BFD session may be used between the
>     tenants of VTEPs IP1 and IP2 to provide end-to-end fault management.
>     In such case, for VTEPs BFD Control packets of that session are
>     indistinguishable from data packets.
> 
> 
>      > > Section 5 comment:
>      > >
>      > > :   The UDP destination port and the TTL of the inner IP packet
>     MUST be
>      > > :   validated to determine if the received packet can be
>     processed by
>      > > :   BFD.  BFD Control packets with unknown MAC address MUST NOT be
>      > > :   forwarded to VMs.
>      > >
>      > > I'd suggest pushing the second sentence into the prior section
>     since it
>      > > deals with MAC addresses rather than the UDP procedures.
>      > >
>      > GIM>> Could you please clarify your suggestion - move to Section
>     4 or to
>      > the preceding paragraph? I think it is the latter but wanted to
>     make sure.
> 
>     Full section 5 from your draft-8 candidate:
>     : 5.  Reception of BFD Packet from VXLAN Tunnel
>     :
>     :    Once a packet is received, the VTEP MUST validate the packet. 
>     If the
>     :    Destination MAC of the inner Ethernet frame matches one of the MAC
>     :    addresses associated with the VTEP the packet MUST be processed
>     :    further.  If the Destination MAC of the inner Ethernet frame
>     doesn't
>     :    match any of VTEP's MAC addresses, then the processing of the
>     :    received VXLAN packet MUST follow the procedures described in
>     :    Section 4.1 [RFC7348].
> 
>     It's not clear what that procedure is, with respect to BFD.  Section 4.1
>     basically says is that when a mapping is discovered, deliver it to
>     that VM
>     with headers removed.
> 
>     Section 4.1 really doesn't discuss dropping behavior.
> 
>     :
>     :    The UDP destination port and the TTL of the inner IP packet MUST be
>     :    validated to determine if the received packet can be processed by
>     :    BFD.
> 
>     This is fine.
> 
>     :    BFD Control packets with unknown MAC address MUST NOT be
>     :    forwarded to VMs.
> 
>     This appears to be clarifying the missing point in the prior
>     paragraph.  If
>     that's the case, why is this sentence not part of the prior paragraph?
> 
> GIM>> So I thought. Moving the sentence to the first paragraph 
> highlighted the contradiction others had pointed earlier:
> On the one hand:
>     If the Destination MAC of the inner Ethernet frame doesn't
>     match any of VTEP's MAC addresses, then the processing of the
>     received VXLAN packet MUST follow the procedures described in
>     Section 4.1 [RFC7348].
> To which we add:
>     BFD Control packets with unknown MAC address
>     MUST NOT be forwarded to VMs.
> But the unknown MACs are treated as BUM according to the last paragraph 
> in Section 4.2 of RFC 7348:
>     Note that multicast frames and "unknown MAC destination" frames are
>     also sent using the multicast tree, similar to the broadcast frames.
> In light of that, can this draft require that BFD packets with unknown 
> MAC be dropped and not flooded over the corresponding to the VNI domain? 
> I think that in addition to moving the sentence up the statement must be 
> updated:
> OLD TEXT:
>     BFD Control packets with unknown MAC address
>     MUST NOT be forwarded to VMs.
> NEW TEXT:
>     If the BFD session is using the Management VNI (Section 6),
>     BFD Control packets with unknown MAC address
>     MUST NOT be forwarded to VMs.
>   Comments? Suggestions?
> 
> 
> 
>     -- Jeff
> 


From nobody Thu Oct 31 09:42:41 2019
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From: Anoop Ghanwani 
Date: Thu, 31 Oct 2019 09:33:36 -0700
Message-ID: 
Subject: Re: [nvo3] BFD over VXLAN: Trapping BFD Control packet at VTEP
To: Jeffrey Haas 
Cc: "Joel M. Halpern" , Greg Mirsky ,  Dinesh Dutt , Santosh P K , NVO3 ,  draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG ,  "T. Sridhar" , xiao.min2@zte.com.cn
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--000000000000e80a820596376988
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What is the definition of management VNI?  Is it that there is no VAP
corresponding to that VNI or something else?  If there is no VAP, then
there is no chance of forwarding such packets anyway.

Anoop

On Thu, Oct 31, 2019 at 9:22 AM Jeffrey Haas  wrote:

> I also agree with Joel.
>
> -- Jeff
>
>
> > On Oct 31, 2019, at 11:59 AM, Joel M. Halpern 
> wrote:
> >
> > Explicitly restricting the discard behavior to the management VNI takes
> care of my concern.
> >
> > Thank you,
> > Joel
> >
> > On 10/31/2019 11:48 AM, Greg Mirsky wrote:
> >> Hi Jeff,
> >> thank you for the detailed clarification of your questions. Please find
> my follow-up notes in-lined tagged GIM2>>.
> >> Regards,
> >> Greg
> >> On Wed, Oct 30, 2019 at 2:14 PM Jeffrey Haas  jhaas@pfrc.org>> wrote:
> >>    Greg,
> >>    On Wed, Oct 30, 2019 at 01:58:30PM -0700, Greg Mirsky wrote:
> >>     > On Wed, Oct 30, 2019 at 1:27 PM Jeffrey Haas  >>    > wrote:
> >>     >
> >>     > > Greg,
> >>     > >
> >>     > > From the updated text:
> >>     > >
> >>     > > "At the same time, a service layer BFD session may be used
> >>    between the
> >>     > > tenants of VTEPs IP1 and IP2 to provide end-to-end fault
> >>    management. In
> >>     > > such case, for VTEPs BFD Control packets of that session are
> >>     > > indistinguishable from data packets.  If end-to-end defect
> >>    detection is
> >>     > > realized as the set of concatenated OAM domains, e.g., VM1-1 -
> >>    IP1 --
> >>     > > IP2 - VM2-1, then the BFD session over VXLAN between VTEPs
> SHOULD
> >>     > > follow the procedures described in Section 6.8.17 [RFC5880]."
> >>     > >
> >>     > > In the case that two VMs are running BFD to each other as a user
> >>     > > application
> >>     > > rather than as part of the virtualized environment, it's
> >>    unlikely that
> >>     > > they'd be treated as concatenated domains.  To do so, the
> >>    tenant VMs would
> >>     > > have to have a sense that they are indeed virtual.
> >>     > >
> >>     > > Is your intent in this text that BFD implementations on the
> >>    server should
> >>     > > detect BFD sessions between servers and change them to a
> >>    concatenated
> >>     > > session?
> >>     > >
> >>     > GIM>> No, we do not suggest that the concatenation of BFD
> sessions be
> >>     > automagical. That may be controlled via the management plane
> though.
> >>    Then my suggestion is we may not want this text.
> >>    It's fine to say "if tenants want to run BFD to each other, and that
> is
> >>    standard BFD (RFC 5881) from the perspective of those tenants" if
> that's
> >>    your intent.  Leave automagic out of the spec. :-)
> >> GIM2>> I'd take the passage referring to the concatenated path out.
> That will leave it as:
> >>    At the same time, a service layer BFD session may be used between the
> >>    tenants of VTEPs IP1 and IP2 to provide end-to-end fault management.
> >>    In such case, for VTEPs BFD Control packets of that session are
> >>    indistinguishable from data packets.
> >>     > > Section 5 comment:
> >>     > >
> >>     > > :   The UDP destination port and the TTL of the inner IP packet
> >>    MUST be
> >>     > > :   validated to determine if the received packet can be
> >>    processed by
> >>     > > :   BFD.  BFD Control packets with unknown MAC address MUST NOT
> be
> >>     > > :   forwarded to VMs.
> >>     > >
> >>     > > I'd suggest pushing the second sentence into the prior section
> >>    since it
> >>     > > deals with MAC addresses rather than the UDP procedures.
> >>     > >
> >>     > GIM>> Could you please clarify your suggestion - move to Section
> >>    4 or to
> >>     > the preceding paragraph? I think it is the latter but wanted to
> >>    make sure.
> >>    Full section 5 from your draft-8 candidate:
> >>    : 5.  Reception of BFD Packet from VXLAN Tunnel
> >>    :
> >>    :    Once a packet is received, the VTEP MUST validate the packet.
>    If the
> >>    :    Destination MAC of the inner Ethernet frame matches one of the
> MAC
> >>    :    addresses associated with the VTEP the packet MUST be processed
> >>    :    further.  If the Destination MAC of the inner Ethernet frame
> >>    doesn't
> >>    :    match any of VTEP's MAC addresses, then the processing of the
> >>    :    received VXLAN packet MUST follow the procedures described in
> >>    :    Section 4.1 [RFC7348].
> >>    It's not clear what that procedure is, with respect to BFD.  Section
> 4.1
> >>    basically says is that when a mapping is discovered, deliver it to
> >>    that VM
> >>    with headers removed.
> >>    Section 4.1 really doesn't discuss dropping behavior.
> >>    :
> >>    :    The UDP destination port and the TTL of the inner IP packet
> MUST be
> >>    :    validated to determine if the received packet can be processed
> by
> >>    :    BFD.
> >>    This is fine.
> >>    :    BFD Control packets with unknown MAC address MUST NOT be
> >>    :    forwarded to VMs.
> >>    This appears to be clarifying the missing point in the prior
> >>    paragraph.  If
> >>    that's the case, why is this sentence not part of the prior
> paragraph?
> >> GIM>> So I thought. Moving the sentence to the first paragraph
> highlighted the contradiction others had pointed earlier:
> >> On the one hand:
> >>    If the Destination MAC of the inner Ethernet frame doesn't
> >>    match any of VTEP's MAC addresses, then the processing of the
> >>    received VXLAN packet MUST follow the procedures described in
> >>    Section 4.1 [RFC7348].
> >> To which we add:
> >>    BFD Control packets with unknown MAC address
> >>    MUST NOT be forwarded to VMs.
> >> But the unknown MACs are treated as BUM according to the last paragraph
> in Section 4.2 of RFC 7348:
> >>    Note that multicast frames and "unknown MAC destination" frames are
> >>    also sent using the multicast tree, similar to the broadcast frames.
> >> In light of that, can this draft require that BFD packets with unknown
> MAC be dropped and not flooded over the corresponding to the VNI domain? I
> think that in addition to moving the sentence up the statement must be
> updated:
> >> OLD TEXT:
> >>    BFD Control packets with unknown MAC address
> >>    MUST NOT be forwarded to VMs.
> >> NEW TEXT:
> >>    If the BFD session is using the Management VNI (Section 6),
> >>    BFD Control packets with unknown MAC address
> >>    MUST NOT be forwarded to VMs.
> >>  Comments? Suggestions?
> >>    -- Jeff
>
>

--000000000000e80a820596376988
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


What is the definition of management VNI?=C2=A0 Is it that=
 there is no VAP corresponding to that VNI or something else?=C2=A0 If ther=
e is no VAP, then there is no chance of forwarding such packets anyway.
Anoop

On Thu, Oct 31, 2019 at 9:22 AM Jeffrey Haas <=
;jhaas@pfrc.org> wrote:
<=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex">I also agree with Joel.


-- Jeff





> On Oct 31, 2019, at 11:59 AM, Joel M. Halpern <jmh@joelhalpern.com> wrote:

> 

> Explicitly restricting the discard behavior to the management VNI take=
s care of my concern.

> 

> Thank you,

> Joel

> 

> On 10/31/2019 11:48 AM, Greg Mirsky wrote:

>> Hi Jeff,

>> thank you for the detailed clarification of your questions. Please=
 find my follow-up notes in-lined tagged GIM2>>.

>> Regards,

>> Greg

>> On Wed, Oct 30, 2019 at 2:14 PM Jeffrey Haas <jhaas@pfrc.org <mailto:jhaas@pfrc.org>> wrote:=


>>=C2=A0 =C2=A0 Greg,

>>=C2=A0 =C2=A0 On Wed, Oct 30, 2019 at 01:58:30PM -0700, Greg Mirsky=
 wrote:

>>=C2=A0 =C2=A0 =C2=A0> On Wed, Oct 30, 2019 at 1:27 PM Jeffrey Ha=
as <jhaas@pfrc.org

>>=C2=A0 =C2=A0 <mailto:jhaas@pfrc.org>> wrote:

>>=C2=A0 =C2=A0 =C2=A0>

>>=C2=A0 =C2=A0 =C2=A0> > Greg,

>>=C2=A0 =C2=A0 =C2=A0> >

>>=C2=A0 =C2=A0 =C2=A0> > From the updated text:

>>=C2=A0 =C2=A0 =C2=A0> >

>>=C2=A0 =C2=A0 =C2=A0> > "At the same time, a service lay=
er BFD session may be used

>>=C2=A0 =C2=A0 between the

>>=C2=A0 =C2=A0 =C2=A0> > tenants of VTEPs IP1 and IP2 to provi=
de end-to-end fault

>>=C2=A0 =C2=A0 management. In

>>=C2=A0 =C2=A0 =C2=A0> > such case, for VTEPs BFD Control pack=
ets of that session are

>>=C2=A0 =C2=A0 =C2=A0> > indistinguishable from data packets.=
=C2=A0 If end-to-end defect

>>=C2=A0 =C2=A0 detection is

>>=C2=A0 =C2=A0 =C2=A0> > realized as the set of concatenated O=
AM domains, e.g., VM1-1 -

>>=C2=A0 =C2=A0 IP1 --

>>=C2=A0 =C2=A0 =C2=A0> > IP2 - VM2-1, then the BFD session ove=
r VXLAN between VTEPs SHOULD

>>=C2=A0 =C2=A0 =C2=A0> > follow the procedures described in Se=
ction 6.8.17 [RFC5880]."

>>=C2=A0 =C2=A0 =C2=A0> >

>>=C2=A0 =C2=A0 =C2=A0> > In the case that two VMs are running =
BFD to each other as a user

>>=C2=A0 =C2=A0 =C2=A0> > application

>>=C2=A0 =C2=A0 =C2=A0> > rather than as part of the virtualize=
d environment, it's

>>=C2=A0 =C2=A0 unlikely that

>>=C2=A0 =C2=A0 =C2=A0> > they'd be treated as concatenated=
 domains.=C2=A0 To do so, the

>>=C2=A0 =C2=A0 tenant VMs would

>>=C2=A0 =C2=A0 =C2=A0> > have to have a sense that they are in=
deed virtual.

>>=C2=A0 =C2=A0 =C2=A0> >

>>=C2=A0 =C2=A0 =C2=A0> > Is your intent in this text that BFD =
implementations on the

>>=C2=A0 =C2=A0 server should

>>=C2=A0 =C2=A0 =C2=A0> > detect BFD sessions between servers a=
nd change them to a

>>=C2=A0 =C2=A0 concatenated

>>=C2=A0 =C2=A0 =C2=A0> > session?

>>=C2=A0 =C2=A0 =C2=A0> >

>>=C2=A0 =C2=A0 =C2=A0> GIM>> No, we do not suggest that the=
 concatenation of BFD sessions be

>>=C2=A0 =C2=A0 =C2=A0> automagical. That may be controlled via th=
e management plane though.

>>=C2=A0 =C2=A0 Then my suggestion is we may not want this text.

>>=C2=A0 =C2=A0 It's fine to say "if tenants want to run BFD=
 to each other, and that is

>>=C2=A0 =C2=A0 standard BFD (RFC 5881) from the perspective of those=
 tenants" if that's

>>=C2=A0 =C2=A0 your intent.=C2=A0 Leave automagic out of the spec. :=
-)

>> GIM2>> I'd take the passage referring to the concatenate=
d path out. That will leave it as:

>>=C2=A0 =C2=A0 At the same time, a service layer BFD session may be =
used between the

>>=C2=A0 =C2=A0 tenants of VTEPs IP1 and IP2 to provide end-to-end fa=
ult management.

>>=C2=A0 =C2=A0 In such case, for VTEPs BFD Control packets of that s=
ession are

>>=C2=A0 =C2=A0 indistinguishable from data packets.

>>=C2=A0 =C2=A0 =C2=A0> > Section 5 comment:

>>=C2=A0 =C2=A0 =C2=A0> >

>>=C2=A0 =C2=A0 =C2=A0> > :=C2=A0 =C2=A0The UDP destination por=
t and the TTL of the inner IP packet

>>=C2=A0 =C2=A0 MUST be

>>=C2=A0 =C2=A0 =C2=A0> > :=C2=A0 =C2=A0validated to determine =
if the received packet can be

>>=C2=A0 =C2=A0 processed by

>>=C2=A0 =C2=A0 =C2=A0> > :=C2=A0 =C2=A0BFD.=C2=A0 BFD Control =
packets with unknown MAC address MUST NOT be

>>=C2=A0 =C2=A0 =C2=A0> > :=C2=A0 =C2=A0forwarded to VMs.

>>=C2=A0 =C2=A0 =C2=A0> >

>>=C2=A0 =C2=A0 =C2=A0> > I'd suggest pushing the second se=
ntence into the prior section

>>=C2=A0 =C2=A0 since it

>>=C2=A0 =C2=A0 =C2=A0> > deals with MAC addresses rather than =
the UDP procedures.

>>=C2=A0 =C2=A0 =C2=A0> >

>>=C2=A0 =C2=A0 =C2=A0> GIM>> Could you please clarify your =
suggestion - move to Section

>>=C2=A0 =C2=A0 4 or to

>>=C2=A0 =C2=A0 =C2=A0> the preceding paragraph? I think it is the=
 latter but wanted to

>>=C2=A0 =C2=A0 make sure.

>>=C2=A0 =C2=A0 Full section 5 from your draft-8 candidate:

>>=C2=A0 =C2=A0 : 5.=C2=A0 Reception of BFD Packet from VXLAN Tunnel<=
br>
>>=C2=A0 =C2=A0 :

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 Once a packet is received, the VTEP MU=
ST validate the packet.=C2=A0 =C2=A0 =C2=A0If the

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 Destination MAC of the inner Ethernet =
frame matches one of the MAC

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 addresses associated with the VTEP the=
 packet MUST be processed

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 further.=C2=A0 If the Destination MAC =
of the inner Ethernet frame

>>=C2=A0 =C2=A0 doesn't

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 match any of VTEP's MAC addresses,=
 then the processing of the

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 received VXLAN packet MUST follow the =
procedures described in

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 Section 4.1 [RFC7348].

>>=C2=A0 =C2=A0 It's not clear what that procedure is, with respe=
ct to BFD.=C2=A0 Section 4.1

>>=C2=A0 =C2=A0 basically says is that when a mapping is discovered, =
deliver it to

>>=C2=A0 =C2=A0 that VM

>>=C2=A0 =C2=A0 with headers removed.

>>=C2=A0 =C2=A0 Section 4.1 really doesn't discuss dropping behav=
ior.

>>=C2=A0 =C2=A0 :

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 The UDP destination port and the TTL o=
f the inner IP packet MUST be

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 validated to determine if the received=
 packet can be processed by

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 BFD.

>>=C2=A0 =C2=A0 This is fine.

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 BFD Control packets with unknown MAC a=
ddress MUST NOT be

>>=C2=A0 =C2=A0 :=C2=A0 =C2=A0 forwarded to VMs.

>>=C2=A0 =C2=A0 This appears to be clarifying the missing point in th=
e prior

>>=C2=A0 =C2=A0 paragraph.=C2=A0 If

>>=C2=A0 =C2=A0 that's the case, why is this sentence not part of=
 the prior paragraph?

>> GIM>> So I thought. Moving the sentence to the first paragra=
ph highlighted the contradiction others had pointed earlier:

>> On the one hand:

>>=C2=A0 =C2=A0 If the Destination MAC of the inner Ethernet frame do=
esn't

>>=C2=A0 =C2=A0 match any of VTEP's MAC addresses, then the proce=
ssing of the

>>=C2=A0 =C2=A0 received VXLAN packet MUST follow the procedures desc=
ribed in

>>=C2=A0 =C2=A0 Section 4.1 [RFC7348].

>> To which we add:

>>=C2=A0 =C2=A0 BFD Control packets with unknown MAC address

>>=C2=A0 =C2=A0 MUST NOT be forwarded to VMs.

>> But the unknown MACs are treated as BUM according to the last para=
graph in Section 4.2 of RFC 7348:

>>=C2=A0 =C2=A0 Note that multicast frames and "unknown MAC dest=
ination" frames are

>>=C2=A0 =C2=A0 also sent using the multicast tree, similar to the br=
oadcast frames.

>> In light of that, can this draft require that BFD packets with unk=
nown MAC be dropped and not flooded over the corresponding to the VNI domai=
n? I think that in addition to moving the sentence up the statement must be=
 updated:

>> OLD TEXT:

>>=C2=A0 =C2=A0 BFD Control packets with unknown MAC address

>>=C2=A0 =C2=A0 MUST NOT be forwarded to VMs.

>> NEW TEXT:

>>=C2=A0 =C2=A0 If the BFD session is using the Management VNI (Secti=
on 6),

>>=C2=A0 =C2=A0 BFD Control packets with unknown MAC address

>>=C2=A0 =C2=A0 MUST NOT be forwarded to VMs.

>>=C2=A0 Comments? Suggestions?

>>=C2=A0 =C2=A0 -- Jeff






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