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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 6 Feb 2020 20:07:00 -0800
Message-ID: <CA+RyBmVDrDgaUBbZ4MR1E_T+O+Z67b9Dxszs821UjKaYGWOa6g@mail.gmail.com>
Subject: Re: draft-ietf-bfd-vxlan IESG status
To: Jeffrey Haas <jhaas@pfrc.org>
Cc: The IESG <iesg@ietf.org>, bfd-chairs@ietf.org, draft-ietf-bfd-vxlan@ietf.org, rtg-bfd WG <rtg-bfd@ietf.org>
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Hi Jeff, et al.,
I've made changes to the draft addressing the Open Issue 3, i.e. selection
of the destination MAC address in the inner Ethernet frame and the use of
the management VNI. I've moved the section that introduces a management VNI
up, after the Deployment and before the section that discusses the
encapsulation of a BFD Control packet. Also, removed the section on
demultiplexing BFD sessions that run concurrently between the pair of VTEPs
(now that is outside the scope).
Please review the changes (attached are the diff and the working version of
the draft). I greatly appreciate your comments and suggestions.

Regards,
Greg

On Mon, Jan 27, 2020 at 2:11 PM Jeffrey Haas <jhaas@pfrc.org> wrote:

> Much like the BFD Working Group discussion on the BFD for vxlan feature,
> the
> IESG review for the draft has reached a stage where it is difficult to
> determine what the related actions are.  (IESG take note for tools
> discussion!)
>
> This email is an attempt to kick the conversation back into gear.
>
> My notes here are based on the current status of the document tracked here:
> https://datatracker.ietf.org/doc/draft-ietf-bfd-vxlan/ballot/
>
> My comments on the draft are based on the -10 version of the draft as
> currently published.
>
> ---
>
> Open Issue 1: Discussion on TTL/Hop Limit = 1
>
> Proposed Action: Greg has proposed text he will send to the working group
> suggesting GTSM procedures be utilized.  The expected concern is how this
> impacts existing implementations.
>
> ---
>
> Open Issue 2: Document Status should be Informational rather than Proposed
> Standard.
>
> Proposed Action: Greg should make the document Informational.  Prior WG
> discussion suggested that we don't really care what level it should be at,
> and had actually requested IESG guidance long ago via our AD.
>
> ---
>
> Open Issue 3: dst IP/MAC assignment procedures for inner VXLAN headers.
> (DISCUSS via Benjamin K.)  Specifically per-VNI form rather than strictly
> VTEP-to-VTEP mode.
>
> Issue Comment 1 (Benjamin K.): This is "a namespace grab in what is
> essentially the tenant's namespace".
>
> Issue Comment 2 (Jeff H.): Joel Halpern flagged this repeatedly as well as
> part of directorate review.
>
> Issue Comment 3 (Benjamin K.): "management VNI does not suffer from this
> namespacing issue".
>
> Issue Comment 4 (Jeff H./Benjamin K.): The concept of a "management VNI" is
> not supported by existing standards work, but is accepted as a common
> implementation behavior.
>
> Issue Comment 5: A significant exploration of this set of issues is
> documented in the following thread:
> https://mailarchive.ietf.org/arch/msg/rtg-bfd/SfXfu3pCh9BxaRFrXbEOgGt6xjE/
>
> Proposed Action: Limit the Internet-Draft's applicability to verifying
> connectivity to the management VNI.  "All other uses of the specification
> to
> test toward other vxlan endpoints are out of scope."
>
> In reviewing the thread, my reading of the comments from Santosh, Anoop,
> and
> Dinesh are effectively "don't break existing implementations".  There is
> acknowledge among those in the discusssion that numbering space collisions
> between the protocol codepoints chosen to run as endpoints for the BFD for
> vxlan session and the tenant space are undesirable.  It is generally agreed
> in the thread (IMO) that for the "management VNI" case that this is not
> problematic, although the details of provisioning are still specific to the
> implementation.
>
> By setting the case aside where a test to a specific VTEP may have tenant
> namespace collisions, the document can be cleaned of a lot of unnecessary
> edge cases that are difficult to generally resolve.  Implementations that
> may choose to permit sessions to non-management VNIs will have need to
> resolve how to deal with collisions.
>
> ---
>
> Open Issue 4: "multicast service node" text (COMMENT via Benjamin K.)
>
> Proposed Action: Incorporate suggested text from Benjamin K. to clarify
> text
> in -10.
>
> ---
>
> Open Issue 5: Comma parsing issue (COMMENT via Benjamin K.)
>
> Proposed Action: Accept Benjamin's suggested changes.  (RFC Editor will win
> the day here though!)
>
> ---
>
> Open Issue 6: "Section 3, MUST NOT be forwarded to a VM" (COMMENT via
> Benjamin K.)
>
> Proposed Action: The fate of this issue is tied to Open Issue 3.
> If the proposal is limited solely to management VNI, this text is not
> relevant and may be deleted.
>
> ---
>
> Open Issue 7: "::FFFF:7F00:0/104 IPv6 range" (COMMENT via Benjamin K.)
>
> Proposed Action: I believe this issue's fate is similarly tied to Open
> Issue 3.
> If the proposal is limited solely to management VNI, this text is not
> relevant and may be deleted.
>
> ---
>
> Open Issue 8: "Section 4: MUST ensure that the BFD Control packet is not
> forwarded to a tenant but is processed locally at the remote VTEP" (COMMENT
> via Benjamin K.)
>
> Proposed Action: I believe this issue's fate is similarly tied to Open
> Issue 3.
> If the proposal is limited solely to management VNI, this text is not
> relevant and may be deleted.
>
> ---
>
> Open Issue 9: "Destination MAC: This MUST NOT be of one of tenant's MAC
> addresses." (COMMENT via Benjamin K.)
>
> Proposed Action: I believe this issue's fate is similarly tied to Open
> Issue 3.
> If the proposal is limited solely to management VNI, this text is not
> relevant and may be deleted.
>
> ---
>
> Open Issue 10: "The details of how the MAC address is obtained are outside
> the scope of this document." (COMMENT via Benjamin K.)
>
> Proposed Action: None.  Reason 1: If we go with only the management VNI,
> provisioning remains an easy answer.  Reason 2: If we go with VNI-to-VNI
> mode, it's not unreasonable for the environment to claim a MAC address.
> This is no different than a switch itself.  Collisions would be handled via
> updated configuration.
>
> ---
>
> Open Issue 11: "dst IP header MUST NOT be one of tenant's" (COMMENT via
> Benjamin
> K.)
>
> Comment 1 (Jeff H.): The loopback range as a destination would serve to
> catch BFD traffic in either VNI-to-VNI or VTEP-to-VTEP mode.  I think this
> is more clearly understood after the IESG reviewed the existing mechanisms
> using the loopback address range in existing RFCs.
>
> Proposed Action: I believe this issue's fate is similarly tied to Open
> Issue 3.
> If the proposal is limited solely to management VNI, this text is not
> relevant and may be deleted.
>
> ---
>
> Open Issue 12: "Section 5, BFD dst mac collision with tenant" (COMMENT via
> Benjamin K.)
>
> Proposed Action: I believe this issue's fate is similarly tied to Open
> Issue 3.
> If the proposal is limited solely to management VNI, this text is not
> relevant and may be deleted.
>
> ---
>
> Open Issue 13: "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." (COMMENT via Benjamin K.)
>
> Proposed Action: Provide reference to RFC 5880/5881 sections covering
> existing BFD procedure.  Do not copy and paste from them.
>
> ---
>
> Open Issue 14: "nits ... then the BFD session" (COMMENT via Benjamin K.)
>
> Proposed Action: Accept grammar correction.
>
> ---
>
> Open Issue 15: "Section 6" (COMMENT via Benjamin K.)
>
> Proposed Action: I believe this issue's fate is similarly tied to Open
> Issue 3.
> If the proposal is limited solely to management VNI, this text is not
> relevant and may be deleted.  In particular, this section attempts to
> justify VNI-to-VNI mode poorly.
>
> ---
>
> Open Issue 16: "Section 9" regarding mis-forwarding/filtering of BFD
> traffic
> toward tenant (COMMENT via Benjamin K.)
>
> Proposed Action: I believe this issue's fate is similarly tied to Open
> Issue 3.
> If the proposal is limited solely to management VNI, this text is not
> relevant and may be deleted.
>
> ---
>
> (Alvaro's DISCUSSes are covered by the above.)
>
> (Alvaro acknowledged that his COMMENTS were cleared on December 25, 2019)
>
> (Eric V's DISCUSS points are covered by prior open points regarding:
>  - TTL (see Open Issue 1)
>  - Mapped IPv6 addresses were covered in discussion with IESG about
> existing
>    RFC behavior for this range.
>  - The mismatch between document IANA action and shepherd writeup is an
>    artifact of document changes since the shepherd writeup had happened.
>    The document currently has no open IANA actions.
>  - Section 9 issues about TTL were addressed in -09 of the document.)
>
> ---
>
> Open Issue 17: "RFC 5881 (BFD) states that it applies to IPv4/IPv6 tunnels,
> may I infer that this document is only required to address the Ethernet
> encapsulation ? I.e.  specifying the Ethernet MAC addresses?" (COMMENT via
> Eric V.)
>
> Comment 1 (Jeff H.): RFC 5881 addresses single-hop "that is associated with
> an incoming interface".  vxlan requires additional demultiplexing based on
> packet contents and thus the comment is not fully applicable.  This
> document
> (draft-ietf-bfd-vxlan) is intended to cover the vxlan protocol
> encapsulation
> for BFD.
>
> Proposed Action: No action required.
>
> ---
>
> Open Issue 18: "BFD session per VXLAN VNI" (COMMENT via Eric V.)
>
> Proposed Action: I believe this issue's fate is similarly tied to Open
> Issue 3.
> If the proposal is limited solely to management VNI, this text is not
> relevant and may be deleted.
>
> ---
>
> Open Issue 19: "Section 4...FCS" (COMMENT via Eric V.)
>
> Proposed Action: Accept suggested change to "Outer Ethernet FCS"?
>
> ---
>
> Open Issue 20: "using the src mac as the dst mac" (COMMENT via Eric V.)
>
> Proposed Action: ?  I'm unclear what the proposal and comment is here.
>
> ---
>
> (TTL issues noted by Eric V. addressed in Open Issue 1.)
>
> ---
>
> Open Issue 21: "throttling of BFD control packets" (COMMENT via Roman D.)
>
> Proposed Action: The section on throttling is written in a confusing manner
> and is in need of a re-write.
>
> In particular, what's unclear is what is doing the throttling and why?  If
> the comment is intended to say that some forms of rate-limiting of the
> vxlan
> traffic between two systems is in place that it may impact BFD, it should
> say that.  And perhaps once said, omit giving "advice".  "If it hurts,
> don't
> do that."
>
> ---
>
> (COMMENTS from Roman D. addressed in -10 and earlier:
>  - citing specific security considerations applicability
>  - nits
> )
>
> (COMMENT from Suresh K. covered in open issues above.)
>
> (COMMENT from Warren K. regardig loopback network range discussed above.)
>
> ---
>
> Open Issue 22: "terminology isn't" (COMMENT via Warren K.)
>
> Proposed Action: Either rename the section "acronyms used in this document"
> or expand the section to cover the terminology.
>
> ---
>
> (Mirja K. indirects a number of issues to "See Olivier's TSV-ART review",
> which is present in this message:
> https://mailarchive.ietf.org/arch/msg/rtg-bfd/y3xDkvpT-ZodhcaBRHNOSDVByA8/
> )
>
> Open Issue 23: "follow same lookup path needs more explanation"
>
> Proposed Action: Add a sentence explaining that this is to ensure that the
> encapsulated BFD traffic requires following the equivalent data path to
> protect the resource"
>
> ---
>
> Open Issue 24: "Discuss ECMP considerations" (TSV-ART via Olivier B.)
>
> Comment 1 (Jeff H.): I believe this came up in the message thread, but base
> BFD also has similar unclear ECMP behaviors.  The working group has avoided
> trying to standardize anything regarding ECMP since it gets very
> implementation specific.  Some vendors will go out of their way to do
> things
> to mitigate ECMP considerations when BFD is in place; others simply ignore
> it.
>
> Proposed Action: Unclear.  None?
>
> ---
>
> (Minor issues report by Olivier B. that have been addressed in -10 or
>  earlier:
>  - p2p vxlan tunnel wording
>  - VNI has been added to section 2.1
>  - "figure 1 could take less space" - not addressed.
>  - section 4 flattened to remove unnecessary sub-sections
>  - "dedicated mac" address no longer in current versions of document
>  - "v4 in v6 / v6 in v4, etc." - intentionally unspecified since arbitrary
>    encapsulations are supported by specification.  Implementations may have
>    specific limitations.
>  - "section 5 dedicated mac" no longer in the document
>  - "decapsulation procedure reference" I believe has been clarified.)
>
> (Mirja's comment on status is covered by Open Issue 2)
>
> (Comments from Barry L. addressed:
>  - "forming up"
>  - bfd packet/vtep packets/vteps plurality agreement.
>  - "may be configured" clarified.
>  - Section 4.1 "of")
>
> ---
>
> Open Issue 25: "leading to a false negative" (COMMENT via Barry L.)
>
> Proposed Action: The underlying concern in this sentence is that BFD
> packets
> must not be mis-delivered to VMs since there will be no BFD machinery
> present in that VM to execute the BFD procedures and thus sessions will
> drop.  Possible action is to simply delete this sentence since it
> prematurely anticipates procedures later described in the document.
>
> ---
>
> Open Issue 26: "loopback range through a firewall" (COMMENT via Barry L.)
>
> Proposed Action: Accept suggested rewording.
>
> ---
>
> Open Issue 27: "Section 4...addresses the scenario" (COMMENT via Barry L.)
>
> Proposed Action: This sentence needs to be reworded.
>
> ---
>
> (Comments from Adam R. addressed:
>  - Form of ipv6 mapped address.
>  - Usage of loopback network  addresses compared to prior RFCs discussed in
>    thread with IESG.)
>
>
>
>
>
> -- Jeff
>

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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Jeff, et al.,<div>I&#39;ve made changes to the draft ad=
dressing the Open Issue 3, i.e. selection of the destination MAC address in=
 the inner Ethernet frame and the use of the management VNI. I&#39;ve moved=
 the section that introduces a management VNI up, after the Deployment and =
before the section that discusses the encapsulation of a BFD Control packet=
. Also, removed the section on demultiplexing BFD sessions that run concurr=
ently=C2=A0between the pair of VTEPs (now that is outside the scope).</div>=
<div>Please review the changes (attached are the diff and the working versi=
on of the draft). I greatly appreciate your comments and suggestions.</div>=
<div><br></div><div>Regards,</div><div>Greg</div></div><br><div class=3D"gm=
ail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Jan 27, 2020 at 2:=
11 PM Jeffrey Haas &lt;<a href=3D"mailto:jhaas@pfrc.org">jhaas@pfrc.org</a>=
&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Much=
 like the BFD Working Group discussion on the BFD for vxlan feature, the<br=
>
IESG review for the draft has reached a stage where it is difficult to<br>
determine what the related actions are.=C2=A0 (IESG take note for tools<br>
discussion!)<br>
<br>
This email is an attempt to kick the conversation back into gear.<br>
<br>
My notes here are based on the current status of the document tracked here:=
<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-bfd-vxlan/ballot/" r=
el=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/draft-=
ietf-bfd-vxlan/ballot/</a><br>
<br>
My comments on the draft are based on the -10 version of the draft as<br>
currently published.<br>
<br>
---<br>
<br>
Open Issue 1: Discussion on TTL/Hop Limit =3D 1<br>
<br>
Proposed Action: Greg has proposed text he will send to the working group<b=
r>
suggesting GTSM procedures be utilized.=C2=A0 The expected concern is how t=
his<br>
impacts existing implementations.<br>
<br>
---<br>
<br>
Open Issue 2: Document Status should be Informational rather than Proposed<=
br>
Standard.<br>
<br>
Proposed Action: Greg should make the document Informational.=C2=A0 Prior W=
G<br>
discussion suggested that we don&#39;t really care what level it should be =
at,<br>
and had actually requested IESG guidance long ago via our AD.<br>
<br>
---<br>
<br>
Open Issue 3: dst IP/MAC assignment procedures for inner VXLAN headers.<br>
(DISCUSS via Benjamin K.)=C2=A0 Specifically per-VNI form rather than stric=
tly<br>
VTEP-to-VTEP mode.<br>
<br>
Issue Comment 1 (Benjamin K.): This is &quot;a namespace grab in what is<br=
>
essentially the tenant&#39;s namespace&quot;.<br>
<br>
Issue Comment 2 (Jeff H.): Joel Halpern flagged this repeatedly as well as<=
br>
part of directorate review.<br>
<br>
Issue Comment 3 (Benjamin K.): &quot;management VNI does not suffer from th=
is<br>
namespacing issue&quot;.<br>
<br>
Issue Comment 4 (Jeff H./Benjamin K.): The concept of a &quot;management VN=
I&quot; is<br>
not supported by existing standards work, but is accepted as a common<br>
implementation behavior.<br>
<br>
Issue Comment 5: A significant exploration of this set of issues is<br>
documented in the following thread:<br>
<a href=3D"https://mailarchive.ietf.org/arch/msg/rtg-bfd/SfXfu3pCh9BxaRFrXb=
EOgGt6xjE/" rel=3D"noreferrer" target=3D"_blank">https://mailarchive.ietf.o=
rg/arch/msg/rtg-bfd/SfXfu3pCh9BxaRFrXbEOgGt6xjE/</a><br>
<br>
Proposed Action: Limit the Internet-Draft&#39;s applicability to verifying<=
br>
connectivity to the management VNI.=C2=A0 &quot;All other uses of the speci=
fication to<br>
test toward other vxlan endpoints are out of scope.&quot;<br>
<br>
In reviewing the thread, my reading of the comments from Santosh, Anoop, an=
d<br>
Dinesh are effectively &quot;don&#39;t break existing implementations&quot;=
.=C2=A0 There is<br>
acknowledge among those in the discusssion that numbering space collisions<=
br>
between the protocol codepoints chosen to run as endpoints for the BFD for<=
br>
vxlan session and the tenant space are undesirable.=C2=A0 It is generally a=
greed<br>
in the thread (IMO) that for the &quot;management VNI&quot; case that this =
is not<br>
problematic, although the details of provisioning are still specific to the=
<br>
implementation.=C2=A0 <br>
<br>
By setting the case aside where a test to a specific VTEP may have tenant<b=
r>
namespace collisions, the document can be cleaned of a lot of unnecessary<b=
r>
edge cases that are difficult to generally resolve.=C2=A0 Implementations t=
hat<br>
may choose to permit sessions to non-management VNIs will have need to<br>
resolve how to deal with collisions.=C2=A0 <br>
<br>
---<br>
<br>
Open Issue 4: &quot;multicast service node&quot; text (COMMENT via Benjamin=
 K.)<br>
<br>
Proposed Action: Incorporate suggested text from Benjamin K. to clarify tex=
t<br>
in -10.<br>
<br>
---<br>
<br>
Open Issue 5: Comma parsing issue (COMMENT via Benjamin K.)<br>
<br>
Proposed Action: Accept Benjamin&#39;s suggested changes.=C2=A0 (RFC Editor=
 will win<br>
the day here though!)<br>
<br>
---<br>
<br>
Open Issue 6: &quot;Section 3, MUST NOT be forwarded to a VM&quot; (COMMENT=
 via<br>
Benjamin K.)<br>
<br>
Proposed Action: The fate of this issue is tied to Open Issue 3.<br>
If the proposal is limited solely to management VNI, this text is not<br>
relevant and may be deleted.<br>
<br>
---<br>
<br>
Open Issue 7: &quot;::FFFF:7F00:0/104 IPv6 range&quot; (COMMENT via Benjami=
n K.)<br>
<br>
Proposed Action: I believe this issue&#39;s fate is similarly tied to Open =
Issue 3.<br>
If the proposal is limited solely to management VNI, this text is not<br>
relevant and may be deleted.<br>
<br>
---<br>
<br>
Open Issue 8: &quot;Section 4: MUST ensure that the BFD Control packet is n=
ot<br>
forwarded to a tenant but is processed locally at the remote VTEP&quot; (CO=
MMENT<br>
via Benjamin K.)<br>
<br>
Proposed Action: I believe this issue&#39;s fate is similarly tied to Open =
Issue 3.<br>
If the proposal is limited solely to management VNI, this text is not<br>
relevant and may be deleted.<br>
<br>
---<br>
<br>
Open Issue 9: &quot;Destination MAC: This MUST NOT be of one of tenant&#39;=
s MAC<br>
addresses.&quot; (COMMENT via Benjamin K.)<br>
<br>
Proposed Action: I believe this issue&#39;s fate is similarly tied to Open =
Issue 3.<br>
If the proposal is limited solely to management VNI, this text is not<br>
relevant and may be deleted.<br>
<br>
---<br>
<br>
Open Issue 10: &quot;The details of how the MAC address is obtained are out=
side<br>
the scope of this document.&quot; (COMMENT via Benjamin K.)<br>
<br>
Proposed Action: None.=C2=A0 Reason 1: If we go with only the management VN=
I,<br>
provisioning remains an easy answer.=C2=A0 Reason 2: If we go with VNI-to-V=
NI<br>
mode, it&#39;s not unreasonable for the environment to claim a MAC address.=
<br>
This is no different than a switch itself.=C2=A0 Collisions would be handle=
d via<br>
updated configuration.<br>
<br>
---<br>
<br>
Open Issue 11: &quot;dst IP header MUST NOT be one of tenant&#39;s&quot; (C=
OMMENT via Benjamin<br>
K.)<br>
<br>
Comment 1 (Jeff H.): The loopback range as a destination would serve to<br>
catch BFD traffic in either VNI-to-VNI or VTEP-to-VTEP mode.=C2=A0 I think =
this<br>
is more clearly understood after the IESG reviewed the existing mechanisms<=
br>
using the loopback address range in existing RFCs.<br>
<br>
Proposed Action: I believe this issue&#39;s fate is similarly tied to Open =
Issue 3.<br>
If the proposal is limited solely to management VNI, this text is not<br>
relevant and may be deleted.<br>
<br>
---<br>
<br>
Open Issue 12: &quot;Section 5, BFD dst mac collision with tenant&quot; (CO=
MMENT via<br>
Benjamin K.)<br>
<br>
Proposed Action: I believe this issue&#39;s fate is similarly tied to Open =
Issue 3.<br>
If the proposal is limited solely to management VNI, this text is not<br>
relevant and may be deleted.<br>
<br>
---<br>
<br>
Open Issue 13: &quot;The UDP destination port and the TTL of the inner IP p=
acket<br>
MUST be validated to determine if the received packet can be processed by<b=
r>
BFD.&quot; (COMMENT via Benjamin K.)<br>
<br>
Proposed Action: Provide reference to RFC 5880/5881 sections covering<br>
existing BFD procedure.=C2=A0 Do not copy and paste from them.<br>
<br>
---<br>
<br>
Open Issue 14: &quot;nits ... then the BFD session&quot; (COMMENT via Benja=
min K.)<br>
<br>
Proposed Action: Accept grammar correction.<br>
<br>
---<br>
<br>
Open Issue 15: &quot;Section 6&quot; (COMMENT via Benjamin K.)<br>
<br>
Proposed Action: I believe this issue&#39;s fate is similarly tied to Open =
Issue 3.<br>
If the proposal is limited solely to management VNI, this text is not<br>
relevant and may be deleted.=C2=A0 In particular, this section attempts to<=
br>
justify VNI-to-VNI mode poorly.=C2=A0 <br>
<br>
---<br>
<br>
Open Issue 16: &quot;Section 9&quot; regarding mis-forwarding/filtering of =
BFD traffic<br>
toward tenant (COMMENT via Benjamin K.)<br>
<br>
Proposed Action: I believe this issue&#39;s fate is similarly tied to Open =
Issue 3.<br>
If the proposal is limited solely to management VNI, this text is not<br>
relevant and may be deleted.<br>
<br>
---<br>
<br>
(Alvaro&#39;s DISCUSSes are covered by the above.)<br>
<br>
(Alvaro acknowledged that his COMMENTS were cleared on December 25, 2019)<b=
r>
<br>
(Eric V&#39;s DISCUSS points are covered by prior open points regarding:<br=
>
=C2=A0- TTL (see Open Issue 1)<br>
=C2=A0- Mapped IPv6 addresses were covered in discussion with IESG about ex=
isting<br>
=C2=A0 =C2=A0RFC behavior for this range.<br>
=C2=A0- The mismatch between document IANA action and shepherd writeup is a=
n<br>
=C2=A0 =C2=A0artifact of document changes since the shepherd writeup had ha=
ppened.<br>
=C2=A0 =C2=A0The document currently has no open IANA actions.<br>
=C2=A0- Section 9 issues about TTL were addressed in -09 of the document.)<=
br>
<br>
---<br>
<br>
Open Issue 17: &quot;RFC 5881 (BFD) states that it applies to IPv4/IPv6 tun=
nels,<br>
may I infer that this document is only required to address the Ethernet<br>
encapsulation ? I.e.=C2=A0 specifying the Ethernet MAC addresses?&quot; (CO=
MMENT via<br>
Eric V.)<br>
<br>
Comment 1 (Jeff H.): RFC 5881 addresses single-hop &quot;that is associated=
 with<br>
an incoming interface&quot;.=C2=A0 vxlan requires additional demultiplexing=
 based on<br>
packet contents and thus the comment is not fully applicable.=C2=A0 This do=
cument<br>
(draft-ietf-bfd-vxlan) is intended to cover the vxlan protocol encapsulatio=
n<br>
for BFD.<br>
<br>
Proposed Action: No action required.<br>
<br>
---<br>
<br>
Open Issue 18: &quot;BFD session per VXLAN VNI&quot; (COMMENT via Eric V.)<=
br>
<br>
Proposed Action: I believe this issue&#39;s fate is similarly tied to Open =
Issue 3.<br>
If the proposal is limited solely to management VNI, this text is not<br>
relevant and may be deleted.<br>
<br>
---<br>
<br>
Open Issue 19: &quot;Section 4...FCS&quot; (COMMENT via Eric V.)<br>
<br>
Proposed Action: Accept suggested change to &quot;Outer Ethernet FCS&quot;?=
<br>
<br>
---<br>
<br>
Open Issue 20: &quot;using the src mac as the dst mac&quot; (COMMENT via Er=
ic V.)<br>
<br>
Proposed Action: ?=C2=A0 I&#39;m unclear what the proposal and comment is h=
ere.<br>
<br>
---<br>
<br>
(TTL issues noted by Eric V. addressed in Open Issue 1.)<br>
<br>
---<br>
<br>
Open Issue 21: &quot;throttling of BFD control packets&quot; (COMMENT via R=
oman D.)<br>
<br>
Proposed Action: The section on throttling is written in a confusing manner=
<br>
and is in need of a re-write.<br>
<br>
In particular, what&#39;s unclear is what is doing the throttling and why?=
=C2=A0 If<br>
the comment is intended to say that some forms of rate-limiting of the vxla=
n<br>
traffic between two systems is in place that it may impact BFD, it should<b=
r>
say that.=C2=A0 And perhaps once said, omit giving &quot;advice&quot;.=C2=
=A0 &quot;If it hurts, don&#39;t<br>
do that.&quot;<br>
<br>
---<br>
<br>
(COMMENTS from Roman D. addressed in -10 and earlier:<br>
=C2=A0- citing specific security considerations applicability<br>
=C2=A0- nits<br>
)<br>
<br>
(COMMENT from Suresh K. covered in open issues above.)<br>
<br>
(COMMENT from Warren K. regardig loopback network range discussed above.)<b=
r>
<br>
---<br>
<br>
Open Issue 22: &quot;terminology isn&#39;t&quot; (COMMENT via Warren K.)<br=
>
<br>
Proposed Action: Either rename the section &quot;acronyms used in this docu=
ment&quot;<br>
or expand the section to cover the terminology.<br>
<br>
---<br>
<br>
(Mirja K. indirects a number of issues to &quot;See Olivier&#39;s TSV-ART r=
eview&quot;,<br>
which is present in this message:<br>
<a href=3D"https://mailarchive.ietf.org/arch/msg/rtg-bfd/y3xDkvpT-ZodhcaBRH=
NOSDVByA8/" rel=3D"noreferrer" target=3D"_blank">https://mailarchive.ietf.o=
rg/arch/msg/rtg-bfd/y3xDkvpT-ZodhcaBRHNOSDVByA8/</a>)<br>
<br>
Open Issue 23: &quot;follow same lookup path needs more explanation&quot;<b=
r>
<br>
Proposed Action: Add a sentence explaining that this is to ensure that the<=
br>
encapsulated BFD traffic requires following the equivalent data path to<br>
protect the resource&quot;<br>
<br>
---<br>
<br>
Open Issue 24: &quot;Discuss ECMP considerations&quot; (TSV-ART via Olivier=
 B.)<br>
<br>
Comment 1 (Jeff H.): I believe this came up in the message thread, but base=
<br>
BFD also has similar unclear ECMP behaviors.=C2=A0 The working group has av=
oided<br>
trying to standardize anything regarding ECMP since it gets very<br>
implementation specific.=C2=A0 Some vendors will go out of their way to do =
things<br>
to mitigate ECMP considerations when BFD is in place; others simply ignore<=
br>
it.<br>
<br>
Proposed Action: Unclear.=C2=A0 None?<br>
<br>
---<br>
<br>
(Minor issues report by Olivier B. that have been addressed in -10 or<br>
=C2=A0earlier:<br>
=C2=A0- p2p vxlan tunnel wording<br>
=C2=A0- VNI has been added to section 2.1<br>
=C2=A0- &quot;figure 1 could take less space&quot; - not addressed.<br>
=C2=A0- section 4 flattened to remove unnecessary sub-sections<br>
=C2=A0- &quot;dedicated mac&quot; address no longer in current versions of =
document<br>
=C2=A0- &quot;v4 in v6 / v6 in v4, etc.&quot; - intentionally unspecified s=
ince arbitrary<br>
=C2=A0 =C2=A0encapsulations are supported by specification.=C2=A0 Implement=
ations may have<br>
=C2=A0 =C2=A0specific limitations.<br>
=C2=A0- &quot;section 5 dedicated mac&quot; no longer in the document<br>
=C2=A0- &quot;decapsulation procedure reference&quot; I believe has been cl=
arified.)<br>
<br>
(Mirja&#39;s comment on status is covered by Open Issue 2)<br>
<br>
(Comments from Barry L. addressed:<br>
=C2=A0- &quot;forming up&quot;<br>
=C2=A0- bfd packet/vtep packets/vteps plurality agreement.<br>
=C2=A0- &quot;may be configured&quot; clarified.<br>
=C2=A0- Section 4.1 &quot;of&quot;)<br>
<br>
---<br>
<br>
Open Issue 25: &quot;leading to a false negative&quot; (COMMENT via Barry L=
.)<br>
<br>
Proposed Action: The underlying concern in this sentence is that BFD packet=
s<br>
must not be mis-delivered to VMs since there will be no BFD machinery<br>
present in that VM to execute the BFD procedures and thus sessions will<br>
drop.=C2=A0 Possible action is to simply delete this sentence since it<br>
prematurely anticipates procedures later described in the document.<br>
<br>
---<br>
<br>
Open Issue 26: &quot;loopback range through a firewall&quot; (COMMENT via B=
arry L.)<br>
<br>
Proposed Action: Accept suggested rewording.<br>
<br>
---<br>
<br>
Open Issue 27: &quot;Section 4...addresses the scenario&quot; (COMMENT via =
Barry L.)<br>
<br>
Proposed Action: This sentence needs to be reworded.<br>
<br>
---<br>
<br>
(Comments from Adam R. addressed:<br>
=C2=A0- Form of ipv6 mapped address.<br>
=C2=A0- Usage of loopback network=C2=A0 addresses compared to prior RFCs di=
scussed in<br>
=C2=A0 =C2=A0thread with IESG.)<br>
<br>
<br>
<br>
<br>
<br>
-- Jeff<br>
</blockquote></div>

--0000000000001f6c21059df4866e--

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Subject: Re: draft-ietf-bfd-vxlan IESG status
To: Greg Mirsky <gregimirsky@gmail.com>, Jeffrey Haas <jhaas@pfrc.org>
Cc: bfd-chairs@ietf.org, draft-ietf-bfd-vxlan@ietf.org,  The IESG <iesg@ietf.org>, rtg-bfd WG <rtg-bfd@ietf.org>
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On January 27, 2020 at 5:44:24 PM, Greg Mirsky wrote:


Greg:

Hi!

> below are the proposed changes to address the IP TTL/Hop Limit open issue

I didn't see a discussion on the list, but since I'm holding the DISCUSS...

Your proposed changes are fine, just one nit:

...
> NEW TEXT:
> TTL or Hop Limit: MUST be set to 255 in accordance with the
> Generalized TTL Security Mechanism (GTSM) [RFC5082].

I think that a better reference would be rfc5881.


I will clear my DISCUSS once the WG confirms, and you submit an update.

Thanks!

Alvaro.


> On Mon, Jan 27, 2020 at 2:11 PM Jeffrey Haas wrote:
...
> >
> > Open Issue 1: Discussion on TTL/Hop Limit = 1
> >
> > Proposed Action: Greg has proposed text he will send to the working group
> > suggesting GTSM procedures be utilized. The expected concern is how this
> > impacts existing implementations.


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Tue, 25 Feb 2020 12:46:47 -0800
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Subject: Re: draft-ietf-bfd-vxlan IESG status
To: Alvaro Retana <aretana.ietf@gmail.com>
Cc: Jeffrey Haas <jhaas@pfrc.org>, bfd-chairs@ietf.org, draft-ietf-bfd-vxlan@ietf.org,  The IESG <iesg@ietf.org>, rtg-bfd WG <rtg-bfd@ietf.org>
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--000000000000caa027059f6c9670
Content-Type: text/plain; charset="UTF-8"

Hi Alvaro,
thank you for your suggestion. I'll update the reference to RFC 5881. And
I've realized that GTSM is not used anywhere else in the document. Cleaned
it up.
I will try to make the new update before the cut-off date.

Regards,
Greg

On Tue, Feb 25, 2020 at 11:25 AM Alvaro Retana <aretana.ietf@gmail.com>
wrote:

> On January 27, 2020 at 5:44:24 PM, Greg Mirsky wrote:
>
>
> Greg:
>
> Hi!
>
> > below are the proposed changes to address the IP TTL/Hop Limit open issue
>
> I didn't see a discussion on the list, but since I'm holding the DISCUSS...
>
> Your proposed changes are fine, just one nit:
>
> ...
> > NEW TEXT:
> > TTL or Hop Limit: MUST be set to 255 in accordance with the
> > Generalized TTL Security Mechanism (GTSM) [RFC5082].
>
> I think that a better reference would be rfc5881.
>
>
> I will clear my DISCUSS once the WG confirms, and you submit an update.
>
> Thanks!
>
> Alvaro.
>
>
> > On Mon, Jan 27, 2020 at 2:11 PM Jeffrey Haas wrote:
> ...
> > >
> > > Open Issue 1: Discussion on TTL/Hop Limit = 1
> > >
> > > Proposed Action: Greg has proposed text he will send to the working
> group
> > > suggesting GTSM procedures be utilized. The expected concern is how
> this
> > > impacts existing implementations.
>

--000000000000caa027059f6c9670
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Alvaro,<div>thank you for your suggestion. I&#39;ll upd=
ate the reference to RFC 5881. And I&#39;ve realized that GTSM is not used =
anywhere else in the document. Cleaned it up.</div><div>I will try to make =
the new update before the cut-off date.</div><div><br></div><div>Regards,</=
div><div>Greg</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" cl=
ass=3D"gmail_attr">On Tue, Feb 25, 2020 at 11:25 AM Alvaro Retana &lt;<a hr=
ef=3D"mailto:aretana.ietf@gmail.com">aretana.ietf@gmail.com</a>&gt; wrote:<=
br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex">On January 27, 2=
020 at 5:44:24 PM, Greg Mirsky wrote:<br>
<br>
<br>
Greg:<br>
<br>
Hi!<br>
<br>
&gt; below are the proposed changes to address the IP TTL/Hop Limit open is=
sue<br>
<br>
I didn&#39;t see a discussion on the list, but since I&#39;m holding the DI=
SCUSS...<br>
<br>
Your proposed changes are fine, just one nit:<br>
<br>
...<br>
&gt; NEW TEXT:<br>
&gt; TTL or Hop Limit: MUST be set to 255 in accordance with the<br>
&gt; Generalized TTL Security Mechanism (GTSM) [RFC5082].<br>
<br>
I think that a better reference would be rfc5881.<br>
<br>
<br>
I will clear my DISCUSS once the WG confirms, and you submit an update.<br>
<br>
Thanks!<br>
<br>
Alvaro.<br>
<br>
<br>
&gt; On Mon, Jan 27, 2020 at 2:11 PM Jeffrey Haas wrote:<br>
...<br>
&gt; &gt;<br>
&gt; &gt; Open Issue 1: Discussion on TTL/Hop Limit =3D 1<br>
&gt; &gt;<br>
&gt; &gt; Proposed Action: Greg has proposed text he will send to the worki=
ng group<br>
&gt; &gt; suggesting GTSM procedures be utilized. The expected concern is h=
ow this<br>
&gt; &gt; impacts existing implementations.<br>
</blockquote></div>

--000000000000caa027059f6c9670--


From nobody Thu Feb 27 12:36:31 2020
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Bidirectional Forwarding Detection WG of the IETF.

        Title           : BFD Stability
        Authors         : Ashesh Mishra
                          Mahesh Jethanandani
                          Ankur Saxena
                          Santosh Pallagatti
                          Mach Chen
                          Peng Fan
	Filename        : draft-ietf-bfd-stability-05.txt
	Pages           : 5
	Date            : 2020-02-27

Abstract:
   This document describes extensions to the Bidirectional Forwarding
   Detection (BFD) protocol to measure BFD stability.  Specifically, it
   describes a mechanism for detection of BFD frame loss.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bfd-stability/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bfd-stability-05
https://datatracker.ietf.org/doc/html/draft-ietf-bfd-stability-05

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From nobody Thu Feb 27 12:48:39 2020
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Bidirectional Forwarding Detection WG of the IETF.

        Title           : Secure BFD Sequence Numbers
        Authors         : Mahesh Jethanandani
                          Sonal Agarwal
                          Ashesh Mishra
                          Ankur Saxena
                          Alan DeKok
	Filename        : draft-ietf-bfd-secure-sequence-numbers-05.txt
	Pages           : 6
	Date            : 2020-02-27

Abstract:
   This document describes a security enhancements for the BFD packet's
   sequence number.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bfd-secure-sequence-numbers/

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https://datatracker.ietf.org/doc/html/draft-ietf-bfd-secure-sequence-numbers-05

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