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From: Ron Bonica <rbonica@juniper.net>
To: SPRING WG List <spring@ietf.org>
Thread-Topic: draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/JZu4dLjvAkpgFO2SAljmIQuhUQw>
Subject: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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Authors,

The document should include a discussion of the relationship between IPv6 a=
ddresses and SIDs. For example:


  *   From what address space can SIDs be drawn? Link local? Multicast? ULA=
?
  *   Can a locator be longer than 64 bits? If so, how can the rest of the =
/64 be used?

                                                                           =
                      Ron



Juniper Business Use Only

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?<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0in;ms=
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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On 1/10/19 23:30, Ron Bonica wrote:
> Authors,
> 
>  
> 
> The document should include a discussion of the relationship between
> IPv6 addresses and SIDs. For example:
> 
>  
> 
>   * From what address space can SIDs be drawn? Link local? Multicast? ULA?
>   * Can a locator be longer than 64 bits? If so, how can the rest of the
>     /64 be used?

I'm not saying that this shouldn't be done or that it is a bad idea, but
I'm curious if is anybody looking at this from a higher level?  (these
seems pretty architectural to me)

Thanks,
-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492





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From: Ron Bonica <rbonica@juniper.net>
To: Fernando Gont <fgont@si6networks.com>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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Fernando,

Someone should. I think that the expertise to do this is in 6man.

                                  Ron


Juniper Business Use Only

-----Original Message-----
From: Fernando Gont <fgont@si6networks.com>=20
Sent: Wednesday, October 2, 2019 3:11 PM
To: Ron Bonica <rbonica@juniper.net>; SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Add=
resses and SIDs

On 1/10/19 23:30, Ron Bonica wrote:
> Authors,
>=20
> =A0
>=20
> The document should include a discussion of the relationship between
> IPv6 addresses and SIDs. For example:
>=20
> =A0
>=20
>   * From what address space can SIDs be drawn? Link local? Multicast? ULA=
?
>   * Can a locator be longer than 64 bits? If so, how can the rest of the
>     /64 be used?

I'm not saying that this shouldn't be done or that it is a bad idea, but I'=
m curious if is anybody looking at this from a higher level?  (these seems =
pretty architectural to me)

Thanks,
--
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492




From nobody Fri Oct  4 06:04:16 2019
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Subject: [spring] I-D Action: draft-ietf-spring-nsh-sr-01.txt
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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 Source Packet Routing in Networking WG of the IETF.

        Title           : Network Service Header (NSH) and Segment Routing Integration for Service Function Chaining (SFC)
        Authors         : James N Guichard
                          Haoyu Song
                          Jeff Tantsura
                          Joel Halpern
                          Wim Henderickx
                          Mohamed Boucadair
                          Syed Hassan
	Filename        : draft-ietf-spring-nsh-sr-01.txt
	Pages           : 16
	Date            : 2019-10-04

Abstract:
   This document describes two application scenarios where Network
   Service Header (NSH) and Segment Routing (SR) techniques can be
   deployed together to support Service Function Chaining (SFC) in an
   efficient manner while maintaining separation of the service and
   transport planes as originally intended by the SFC architecture.

   In the first scenario, an NSH-based SFC is created using SR as the
   transport between Service Function Forwarders (SFFs).  SR in this
   case is just one of many encapsulations that could be used to
   maintain the transport-independent nature of NSH-based service
   chains.

   In the second scenario, SR is used to represent each service hop of
   the NSH-based SFC as a segment within the segment-list.  SR and NSH
   in this case are integrated.

   In both scenarios SR is responsible for steering packets between SFFs
   along a given Service Function Path (SFP) while NSH is responsible
   for maintaining the integrity of the service plane, the SFC instance
   context, and any associated metadata.

   These application scenarios demonstrate that NSH and SR can work
   jointly and complement each other leaving the network operator with
   the flexibility to use whichever transport technology makes sense in
   specific areas of their network infrastructure, and still maintain an
   end-to-end service plane using NSH.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-nsh-sr/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-nsh-sr-01
https://datatracker.ietf.org/doc/html/draft-ietf-spring-nsh-sr-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-nsh-sr-01


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From: "Rakesh Gandhi (rgandhi)" <rgandhi@cisco.com>
To: "spring@ietf.org" <spring@ietf.org>
CC: "mpls@ietf.org" <mpls@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
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From: "Rakesh Gandhi (rgandhi)" <rgandhi@cisco.com>
To: "spring@ietf.org" <spring@ietf.org>
CC: "ippm@ietf.org" <ippm@ietf.org>
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From nobody Mon Oct  7 00:24:49 2019
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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 Source Packet Routing in Networking WG of the IETF.

        Title           : SRv6 Network Programming
        Authors         : Clarence Filsfils
                          Pablo Camarillo Garvia
                          John Leddy
                          Daniel Voyer
                          Satoru Matsushima
                          Zhenbin Li
	Filename        : draft-ietf-spring-srv6-network-programming-04.txt
	Pages           : 41
	Date            : 2019-10-07

Abstract:
   This document describes the SRv6 network programming concept and its
   most basic functions.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04
https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-srv6-network-programming-04


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Mon Oct  7 00:34:01 2019
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To: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, "spring@ietf.org" <spring@ietf.org>, "ipv6@ietf.org" <ipv6@ietf.org>
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From: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
To: li zhenqiang <li_zhenqiang@hotmail.com>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, "spring@ietf.org" <spring@ietf.org>, "ipv6@ietf.org" <ipv6@ietf.org>
CC: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
Thread-Topic: RE: [spring] FW: I-D Action: draft-ietf-spring-srv6-network-programming-03.txt
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Subject: Re: [spring] FW: I-D Action: draft-ietf-spring-srv6-network-programming-03.txt
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To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>
Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/Wp7z-M4kPMbdXS1YNuX2QaTvo04>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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In-line comments=20

Thanks=20

Gyan

Sent from my iPhone

> On Oct 3, 2019, at 12:25 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.iet=
f.org> wrote:
>=20
> Fernando,
>=20
> Someone should. I think that the expertise to do this is in 6man.
>=20
>                                  Ron
>=20
>=20
> Juniper Business Use Only
>=20
> -----Original Message-----
> From: Fernando Gont <fgont@si6networks.com>=20
> Sent: Wednesday, October 2, 2019 3:11 PM
> To: Ron Bonica <rbonica@juniper.net>; SPRING WG List <spring@ietf.org>
> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Ad=
dresses and SIDs
>=20
>> On 1/10/19 23:30, Ron Bonica wrote:
>> Authors,
>>=20
>> =20
>>=20
>> The document should include a discussion of the relationship between
>> IPv6 addresses and SIDs. For example:
>>=20
>> =20
>>=20
>>  * =46rom what address space can SIDs be drawn? Link local? Multicast? UL=
A?
>>  * Can a locator be longer than 64 bits? If so, how can the rest of the
>>    /64 be used?
>=20
> I'm not saying that this shouldn't be done or that it is a bad idea, but I=
'm curious if is anybody looking at this from a higher level?  (these seems p=
retty architectural to me)
>=20
> Thanks,
> --
> Fernando Gont
> SI6 Networks
> e-mail: fgont@si6networks.com
> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>=20
>=20

[Gyan] The SRv6 SID format is below:

So from an IPv6 data plane forwarding perspective the fixed length 64 bit Lo=
cator is copied hop by hop into the destination address of the IPv6 header t=
o the tail end FEC destination egress PE and during failover Ti-LFA kicks in=
 additional EH is inserted {violating RFC 8200} at the PLR NNHOP to the simi=
lar to RLFA PQ node.

So with SRV6 native traffic engineering the locator is either the physical I=
P on ingress interface along each hop or loopback along each hop and so is e=
ither a GUA or ULA but not LL or multicast address is what I understand from=
 a technical standpoint.

=46rom everything I have read the SID is fixed at 64 bit length maximum but I=
 guess you can have a smaller then 64 bit locator.

I am working on getting this setup in the lab now so that will really help u=
nderstand the real world implementations.

SRv6 SID format:

128-bits Segment IDs can be used and allocated for different purposes, for e=
xample:
=E2=80=A2 The first 64 bits can be used to direct traffic to a specific node=
 in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D of the program
=E2=80=A2 The next 32 bits can be used to enforce some actions on the traffi=
c =E2=80=93 the =E2=80=9Cfunction=E2=80=9Dpart
=E2=80=A2 The remaining 32 bits can be used to pass some additional informat=
ion =E2=80=93 the =E2=80=9Cargument=E2=80=9D part
128-bit SRv6 SID
Locator: routed to the node performing the function Function: any possible f=
unction
Flexible bit-length selection

>=20
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring


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From: Ron Bonica <rbonica@juniper.net>
To: Gyan Mishra <hayabusagsm@gmail.com>
CC: Fernando Gont <fgont@si6networks.com>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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From: Gyan Mishra <hayabusagsm@gmail.com>
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To: Ron Bonica <rbonica@juniper.net>
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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Hi Ron,=20

I read that as well in my SRv6 studies so thinking about it logically from a=
n IGP ospf or ISIS longest match routing IPv6 FIB entry perspective for me m=
akes sense to understand the SRv6 IPv6 data plane.  So I think my interpreta=
tion is that the 128 bit SID is broken up into hierarchy fields with intelli=
gence but from a routing perspective it=E2=80=99s an IPv6 address of a conne=
cted interface on a P or PE router which is a /127 for p2p links however it d=
efines your =E2=80=9Cnext hop=E2=80=9D NH or =E2=80=9Cnext next hop=E2=80=9D=
 NNH in the legacy MPLS TE FRR node or path protection or IP-LFA/Remote LFA o=
r you can think of it like a MPLS TE autoroute or FA (forwarding adjacencies=
) and to use that path you have to static next hop to the tunnel but in this=
 SRv6 case it=E2=80=99s a next hop IPv6 address which is a full 128 bit addr=
ess that is in the SID entry in the SID list as the next hop for your FEC de=
stination in the IPv6 FIB entry.

To make this easier for me to understand the SRv6 spec and how to interpret l=
ets think of an example of a service provider core with an IPv6 data plane p=
ath between ingress PE and egress and a egress FEC which is the loopback0 fo=
r your ibgp peering vpn services which is the IPv6 destination last SID entr=
y in the SID list which the one hop prior P would do it=E2=80=99s normal PSP=
 similar to PHP in the mpls world.  So now imagine each P router along the p=
ath to the destination PE has a bunch of /127 p2p links.  So now the 1st SID=
 entry would be to the next hop P from the originating PE that inserted the E=
H routing type 4 header SRH to source route the traffic along the engineered=
 path.  So now if you examine that 1st SID entry it is a 128 bit address wit=
h embedded information such as the function and arguments in the station id s=
o the actual IPv6 FIB entry for the egress PE FEC destination would have a n=
ext hop of the P router which is the SID what the 1st SID contains which is a=
 128 bit address to route to the 1st node which is the next hop PE. Once the=
 packet arrives at the 1st node in the case the ingress P the station id IID=
 is decoded for any functions or argument the need to be executed by the ins=
truction PSSI.=20

That=E2=80=99s my interpretation but I have to build this out in the lab do d=
ig deeper into the bits and bytes. =20

Cheers,

Gyan

Sent from my iPhone

> On Oct 9, 2019, at 8:02 PM, Ron Bonica <rbonica@juniper.net> wrote:
>=20
> Gyan,
>=20
> If the Locator were guaranteed to be 64 bits, as you suggest, there would b=
e no problem. However, the following text from Section 3.1 suggests otherwis=
e.
>=20
> "   An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is the L
>   most significant bits and FUNCT (function) is the 128-L least
>   significant bits of the SID.  L is called the locator length and is
>   flexible.  Each operator is free to use the locator length it
>   chooses.  Most often the locator is routable and leads to the node
>   which instantiates that SID.  A control-plane protocol might
>   represent the locator as B:N where B is the SRv6 SID block (IPv6
>   subnet allocated for SRv6 SIDs by the operator) and N is the
>   identifier of the parent node."
>=20
>                                                                    Ron
>=20
>=20
>=20
> Juniper Business Use Only
>=20
> -----Original Message-----
> From: Gyan Mishra <hayabusagsm@gmail.com>=20
> Sent: Wednesday, October 9, 2019 7:21 PM
> To: Ron Bonica <rbonica@juniper.net>
> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List <spring@ietf.org=
>
> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Ad=
dresses and SIDs
>=20
>=20
>=20
> In-line comments=20
>=20
> Thanks=20
>=20
> Gyan
>=20
> Sent from my iPhone
>=20
>> On Oct 3, 2019, at 12:25 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.ie=
tf.org> wrote:
>>=20
>> Fernando,
>>=20
>> Someone should. I think that the expertise to do this is in 6man.
>>=20
>>                                 Ron
>>=20
>>=20
>> Juniper Business Use Only
>>=20
>> -----Original Message-----
>> From: Fernando Gont <fgont@si6networks.com>
>> Sent: Wednesday, October 2, 2019 3:11 PM
>> To: Ron Bonica <rbonica@juniper.net>; SPRING WG List <spring@ietf.org>
>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -=20
>> IPv6 Addresses and SIDs
>>=20
>>> On 1/10/19 23:30, Ron Bonica wrote:
>>> Authors,
>>>=20
>>>=20
>>>=20
>>> The document should include a discussion of the relationship between
>>> IPv6 addresses and SIDs. For example:
>>>=20
>>>=20
>>>=20
>>> * =46rom what address space can SIDs be drawn? Link local? Multicast? UL=
A?
>>> * Can a locator be longer than 64 bits? If so, how can the rest of the
>>>   /64 be used?
>>=20
>> I'm not saying that this shouldn't be done or that it is a bad idea,=20
>> but I'm curious if is anybody looking at this from a higher level? =20
>> (these seems pretty architectural to me)
>>=20
>> Thanks,
>> --
>> Fernando Gont
>> SI6 Networks
>> e-mail: fgont@si6networks.com
>> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>>=20
>>=20
>=20
> [Gyan] The SRv6 SID format is below:
>=20
> So from an IPv6 data plane forwarding perspective the fixed length 64 bit L=
ocator is copied hop by hop into the destination address of the IPv6 header t=
o the tail end FEC destination egress PE and during failover Ti-LFA kicks in=
 additional EH is inserted {violating RFC 8200} at the PLR NNHOP to the simi=
lar to RLFA PQ node.
>=20
> So with SRV6 native traffic engineering the locator is either the physical=
 IP on ingress interface along each hop or loopback along each hop and so is=
 either a GUA or ULA but not LL or multicast address is what I understand fr=
om a technical standpoint.
>=20
> =46rom everything I have read the SID is fixed at 64 bit length maximum bu=
t I guess you can have a smaller then 64 bit locator.
>=20
> I am working on getting this setup in the lab now so that will really help=
 understand the real world implementations.
>=20
> SRv6 SID format:
>=20
> 128-bits Segment IDs can be used and allocated for different purposes, for=
 example:
> =E2=80=A2 The first 64 bits can be used to direct traffic to a specific no=
de in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D of the program =E2=
=80=A2 The next 32 bits can be used to enforce some actions on the traffic =E2=
=80=93 the =E2=80=9Cfunction=E2=80=9Dpart =E2=80=A2 The remaining 32 bits ca=
n be used to pass some additional information =E2=80=93 the =E2=80=9Cargumen=
t=E2=80=9D part 128-bit SRv6 SID
> Locator: routed to the node performing the function Function: any possible=
 function Flexible bit-length selection
>=20
>>=20
>> _______________________________________________
>> spring mailing list
>> spring@ietf.org
>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spri
>> ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZGQRTz6hag6LoSzz8K
>> kBJW9qEVHARw$


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Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 10 Oct 2019 11:05:28 +0200
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Cc: Gyan Mishra <hayabusagsm@gmail.com>, Ron Bonica <rbonica@juniper.net>,  Fernando Gont <fgont@si6networks.com>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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> so they are not overlap each other, but Both of them must advertised by
IGP or BGP protocol

While it is an option it is not "must". You can use your regular routing
addresses as SID locators and it perfectly ok for SRv6 and routing locators
to be identical.

Of course if you want to to create separate address spaces it is fine as
well.

Thx,
R.


On Thu, Oct 10, 2019 at 10:44 AM Wang, Weibin (NSB - CN/Shanghai) <
weibin.wang@nokia-sbell.com> wrote:

> The key character of SRv6 is the SRv6 SID has capability of routable
> function, it is reachable according to FIBv6, so the SIDs, I think, must =
be
> allocated from unicast IPv6 address space, because the SRv6 domain is
> limited and controlled by operator, such as deploying it within it's AS
> domain, so ULA as well GUA, I think, are also options for SRv6 SID; and t=
he
> SID block is separate from plain IPv6 address block which are usually
> configured under Node's interfaces; so they are not overlap each other, b=
ut
> Both of them must advertised by IGP or BGP protocol, they perform differe=
nt
> function within network; how to allocate the SID and how to indicate leng=
th
> of SID prefix May be up to operator and its specific network scenario.
>
> --------------------------------------
> Cheers !
>
>
> WANG Weibin
>
> -----Original Message-----
> From: spring <spring-bounces@ietf.org> On Behalf Of Gyan Mishra
> Sent: 2019=E5=B9=B410=E6=9C=8810=E6=97=A5 10:58
> To: Ron Bonica <rbonica@juniper.net>
> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List <spring@ietf.or=
g
> >
> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6
> Addresses and SIDs
>
>
> Hi Ron,
>
> I read that as well in my SRv6 studies so thinking about it logically fro=
m
> an IGP ospf or ISIS longest match routing IPv6 FIB entry perspective for =
me
> makes sense to understand the SRv6 IPv6 data plane.  So I think my
> interpretation is that the 128 bit SID is broken up into hierarchy fields
> with intelligence but from a routing perspective it=E2=80=99s an IPv6 add=
ress of a
> connected interface on a P or PE router which is a /127 for p2p links
> however it defines your =E2=80=9Cnext hop=E2=80=9D NH or =E2=80=9Cnext ne=
xt hop=E2=80=9D NNH in the legacy
> MPLS TE FRR node or path protection or IP-LFA/Remote LFA or you can think
> of it like a MPLS TE autoroute or FA (forwarding adjacencies) and to use
> that path you have to static next hop to the tunnel but in this SRv6 case
> it=E2=80=99s a next hop IPv6 address which is a full 128 bit address that=
 is in the
> SID entry in the SID list as the next hop for your FEC destination in the
> IPv6 FIB entry.
>
> To make this easier for me to understand the SRv6 spec and how to
> interpret lets think of an example of a service provider core with an IPv=
6
> data plane path between ingress PE and egress and a egress FEC which is t=
he
> loopback0 for your ibgp peering vpn services which is the IPv6 destinatio=
n
> last SID entry in the SID list which the one hop prior P would do it=E2=
=80=99s
> normal PSP similar to PHP in the mpls world.  So now imagine each P route=
r
> along the path to the destination PE has a bunch of /127 p2p links.  So n=
ow
> the 1st SID entry would be to the next hop P from the originating PE that
> inserted the EH routing type 4 header SRH to source route the traffic alo=
ng
> the engineered path.  So now if you examine that 1st SID entry it is a 12=
8
> bit address with embedded information such as the function and arguments =
in
> the station id so the actual IPv6 FIB entry for the egress PE FEC
> destination would have a next hop of the P router which is the SID what t=
he
> 1st SID contains which is a 128 bit address to route to the 1st node whic=
h
> is the next hop PE. Once the packet arrives at the 1st node in the case t=
he
> ingress P the station id IID is decoded for any functions or argument the
> need to be executed by the instruction PSSI.
>
> That=E2=80=99s my interpretation but I have to build this out in the lab =
do dig
> deeper into the bits and bytes.
>
> Cheers,
>
> Gyan
>
> Sent from my iPhone
>
> > On Oct 9, 2019, at 8:02 PM, Ron Bonica <rbonica@juniper.net> wrote:
> >
> > Gyan,
> >
> > If the Locator were guaranteed to be 64 bits, as you suggest, there
> would be no problem. However, the following text from Section 3.1 suggest=
s
> otherwise.
> >
> > "   An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is the =
L
> >   most significant bits and FUNCT (function) is the 128-L least
> >   significant bits of the SID.  L is called the locator length and is
> >   flexible.  Each operator is free to use the locator length it
> >   chooses.  Most often the locator is routable and leads to the node
> >   which instantiates that SID.  A control-plane protocol might
> >   represent the locator as B:N where B is the SRv6 SID block (IPv6
> >   subnet allocated for SRv6 SIDs by the operator) and N is the
> >   identifier of the parent node."
> >
> >                                                                    Ron
> >
> >
> >
> > Juniper Business Use Only
> >
> > -----Original Message-----
> > From: Gyan Mishra <hayabusagsm@gmail.com>
> > Sent: Wednesday, October 9, 2019 7:21 PM
> > To: Ron Bonica <rbonica@juniper.net>
> > Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List
> > <spring@ietf.org>
> > Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
> > IPv6 Addresses and SIDs
> >
> >
> >
> > In-line comments
> >
> > Thanks
> >
> > Gyan
> >
> > Sent from my iPhone
> >
> >> On Oct 3, 2019, at 12:25 PM, Ron Bonica <rbonica=3D
> 40juniper.net@dmarc.ietf.org> wrote:
> >>
> >> Fernando,
> >>
> >> Someone should. I think that the expertise to do this is in 6man.
> >>
> >>                                 Ron
> >>
> >>
> >> Juniper Business Use Only
> >>
> >> -----Original Message-----
> >> From: Fernando Gont <fgont@si6networks.com>
> >> Sent: Wednesday, October 2, 2019 3:11 PM
> >> To: Ron Bonica <rbonica@juniper.net>; SPRING WG List
> >> <spring@ietf.org>
> >> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
> >> IPv6 Addresses and SIDs
> >>
> >>> On 1/10/19 23:30, Ron Bonica wrote:
> >>> Authors,
> >>>
> >>>
> >>>
> >>> The document should include a discussion of the relationship between
> >>> IPv6 addresses and SIDs. For example:
> >>>
> >>>
> >>>
> >>> * From what address space can SIDs be drawn? Link local? Multicast?
> ULA?
> >>> * Can a locator be longer than 64 bits? If so, how can the rest of th=
e
> >>>   /64 be used?
> >>
> >> I'm not saying that this shouldn't be done or that it is a bad idea,
> >> but I'm curious if is anybody looking at this from a higher level?
> >> (these seems pretty architectural to me)
> >>
> >> Thanks,
> >> --
> >> Fernando Gont
> >> SI6 Networks
> >> e-mail: fgont@si6networks.com
> >> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
> >>
> >>
> >
> > [Gyan] The SRv6 SID format is below:
> >
> > So from an IPv6 data plane forwarding perspective the fixed length 64
> bit Locator is copied hop by hop into the destination address of the IPv6
> header to the tail end FEC destination egress PE and during failover Ti-L=
FA
> kicks in additional EH is inserted {violating RFC 8200} at the PLR NNHOP =
to
> the similar to RLFA PQ node.
> >
> > So with SRV6 native traffic engineering the locator is either the
> physical IP on ingress interface along each hop or loopback along each ho=
p
> and so is either a GUA or ULA but not LL or multicast address is what I
> understand from a technical standpoint.
> >
> > From everything I have read the SID is fixed at 64 bit length maximum
> but I guess you can have a smaller then 64 bit locator.
> >
> > I am working on getting this setup in the lab now so that will really
> help understand the real world implementations.
> >
> > SRv6 SID format:
> >
> > 128-bits Segment IDs can be used and allocated for different purposes,
> for example:
> > =E2=80=A2 The first 64 bits can be used to direct traffic to a specific=
 node
> > in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D of the program=
 =E2=80=A2 The next 32 bits can
> > be used to enforce some actions on the traffic =E2=80=93 the =E2=80=9Cf=
unction=E2=80=9Dpart =E2=80=A2
> > The remaining 32 bits can be used to pass some additional information
> > =E2=80=93 the =E2=80=9Cargument=E2=80=9D part 128-bit SRv6 SID
> > Locator: routed to the node performing the function Function: any
> > possible function Flexible bit-length selection
> >
> >>
> >> _______________________________________________
> >> spring mailing list
> >> spring@ietf.org
> >> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spr
> >> i
> >> ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZGQRTz6hag6LoSzz8
> >> K
> >> kBJW9qEVHARw$
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>

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

<div dir=3D"ltr">&gt; so they are not overlap each other, but Both of them =
must advertised by IGP or BGP protocol=C2=A0=C2=A0<br><div><br></div><div>W=
hile it is an option it is not &quot;must&quot;. You can use your regular r=
outing addresses as SID locators and it perfectly ok for SRv6 and routing l=
ocators to be identical.=C2=A0</div><div><br></div><div>Of course if you wa=
nt to to=C2=A0create separate address spaces it is fine as well.=C2=A0</div=
><div><br></div><div>Thx,</div><div>R.</div><div><br></div></div><br><div c=
lass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Oct 10, =
2019 at 10:44 AM Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:wei=
bin.wang@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt; wrote:<br></d=
iv><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bord=
er-left:1px solid rgb(204,204,204);padding-left:1ex">The key character of S=
Rv6 is the SRv6 SID has capability of routable function, it is reachable ac=
cording to FIBv6, so the SIDs, I think, must be allocated from unicast IPv6=
 address space, because the SRv6 domain is limited and controlled by operat=
or, such as deploying it within it&#39;s AS domain, so ULA as well GUA, I t=
hink, are also options for SRv6 SID; and the SID block is separate from pla=
in IPv6 address block which are usually configured under Node&#39;s interfa=
ces; so they are not overlap each other, but Both of them must advertised b=
y IGP or BGP protocol, they perform different function within network; how =
to allocate the SID and how to indicate length of SID prefix May be up to o=
perator and its specific network scenario.<br>
<br>
--------------------------------------<br>
Cheers !<br>
<br>
<br>
WANG Weibin=C2=A0 <br>
<br>
-----Original Message-----<br>
From: spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" target=3D"_blan=
k">spring-bounces@ietf.org</a>&gt; On Behalf Of Gyan Mishra<br>
Sent: 2019=E5=B9=B410=E6=9C=8810=E6=97=A5 10:58<br>
To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_blank"=
>rbonica@juniper.net</a>&gt;<br>
Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com" target=3D"_b=
lank">fgont@si6networks.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:s=
pring@ietf.org" target=3D"_blank">spring@ietf.org</a>&gt;<br>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Add=
resses and SIDs<br>
<br>
<br>
Hi Ron, <br>
<br>
I read that as well in my SRv6 studies so thinking about it logically from =
an IGP ospf or ISIS longest match routing IPv6 FIB entry perspective for me=
 makes sense to understand the SRv6 IPv6 data plane.=C2=A0 So I think my in=
terpretation is that the 128 bit SID is broken up into hierarchy fields wit=
h intelligence but from a routing perspective it=E2=80=99s an IPv6 address =
of a connected interface on a P or PE router which is a /127 for p2p links =
however it defines your =E2=80=9Cnext hop=E2=80=9D NH or =E2=80=9Cnext next=
 hop=E2=80=9D NNH in the legacy MPLS TE FRR node or path protection or IP-L=
FA/Remote LFA or you can think of it like a MPLS TE autoroute or FA (forwar=
ding adjacencies) and to use that path you have to static next hop to the t=
unnel but in this SRv6 case it=E2=80=99s a next hop IPv6 address which is a=
 full 128 bit address that is in the SID entry in the SID list as the next =
hop for your FEC destination in the IPv6 FIB entry.<br>
<br>
To make this easier for me to understand the SRv6 spec and how to interpret=
 lets think of an example of a service provider core with an IPv6 data plan=
e path between ingress PE and egress and a egress FEC which is the loopback=
0 for your ibgp peering vpn services which is the IPv6 destination last SID=
 entry in the SID list which the one hop prior P would do it=E2=80=99s norm=
al PSP similar to PHP in the mpls world.=C2=A0 So now imagine each P router=
 along the path to the destination PE has a bunch of /127 p2p links.=C2=A0 =
So now the 1st SID entry would be to the next hop P from the originating PE=
 that inserted the EH routing type 4 header SRH to source route the traffic=
 along the engineered path.=C2=A0 So now if you examine that 1st SID entry =
it is a 128 bit address with embedded information such as the function and =
arguments in the station id so the actual IPv6 FIB entry for the egress PE =
FEC destination would have a next hop of the P router which is the SID what=
 the 1st SID contains which is a 128 bit address to route to the 1st node w=
hich is the next hop PE. Once the packet arrives at the 1st node in the cas=
e the ingress P the station id IID is decoded for any functions or argument=
 the need to be executed by the instruction PSSI. <br>
<br>
That=E2=80=99s my interpretation but I have to build this out in the lab do=
 dig deeper into the bits and bytes.=C2=A0 <br>
<br>
Cheers,<br>
<br>
Gyan<br>
<br>
Sent from my iPhone<br>
<br>
&gt; On Oct 9, 2019, at 8:02 PM, Ron Bonica &lt;<a href=3D"mailto:rbonica@j=
uniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt; wrote:<br>
&gt; <br>
&gt; Gyan,<br>
&gt; <br>
&gt; If the Locator were guaranteed to be 64 bits, as you suggest, there wo=
uld be no problem. However, the following text from Section 3.1 suggests ot=
herwise.<br>
&gt; <br>
&gt; &quot;=C2=A0 =C2=A0An SRv6 SID is represented as LOC:FUNCT where LOC (=
locator) is the L<br>
&gt;=C2=A0 =C2=A0most significant bits and FUNCT (function) is the 128-L le=
ast<br>
&gt;=C2=A0 =C2=A0significant bits of the SID.=C2=A0 L is called the locator=
 length and is<br>
&gt;=C2=A0 =C2=A0flexible.=C2=A0 Each operator is free to use the locator l=
ength it<br>
&gt;=C2=A0 =C2=A0chooses.=C2=A0 Most often the locator is routable and lead=
s to the node<br>
&gt;=C2=A0 =C2=A0which instantiates that SID.=C2=A0 A control-plane protoco=
l might<br>
&gt;=C2=A0 =C2=A0represent the locator as B:N where B is the SRv6 SID block=
 (IPv6<br>
&gt;=C2=A0 =C2=A0subnet allocated for SRv6 SIDs by the operator) and N is t=
he<br>
&gt;=C2=A0 =C2=A0identifier of the parent node.&quot;<br>
&gt; <br>
&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 Ron<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; Juniper Business Use Only<br>
&gt; <br>
&gt; -----Original Message-----<br>
&gt; From: Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.com" target=
=3D"_blank">hayabusagsm@gmail.com</a>&gt;<br>
&gt; Sent: Wednesday, October 9, 2019 7:21 PM<br>
&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_b=
lank">rbonica@juniper.net</a>&gt;<br>
&gt; Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com" target=
=3D"_blank">fgont@si6networks.com</a>&gt;; SPRING WG List <br>
&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.o=
rg</a>&gt;<br>
&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - <br=
>
&gt; IPv6 Addresses and SIDs<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; In-line comments<br>
&gt; <br>
&gt; Thanks<br>
&gt; <br>
&gt; Gyan<br>
&gt; <br>
&gt; Sent from my iPhone<br>
&gt; <br>
&gt;&gt; On Oct 3, 2019, at 12:25 PM, Ron Bonica &lt;rbonica=3D<a href=3D"m=
ailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40juniper.net@dmarc.i=
etf.org</a>&gt; wrote:<br>
&gt;&gt; <br>
&gt;&gt; Fernando,<br>
&gt;&gt; <br>
&gt;&gt; Someone should. I think that the expertise to do this is in 6man.<=
br>
&gt;&gt; <br>
&gt;&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=A0Ron<br>
&gt;&gt; <br>
&gt;&gt; <br>
&gt;&gt; Juniper Business Use Only<br>
&gt;&gt; <br>
&gt;&gt; -----Original Message-----<br>
&gt;&gt; From: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com" t=
arget=3D"_blank">fgont@si6networks.com</a>&gt;<br>
&gt;&gt; Sent: Wednesday, October 2, 2019 3:11 PM<br>
&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=
=3D"_blank">rbonica@juniper.net</a>&gt;; SPRING WG List <br>
&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ie=
tf.org</a>&gt;<br>
&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -=
<br>
&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt; <br>
&gt;&gt;&gt; On 1/10/19 23:30, Ron Bonica wrote:<br>
&gt;&gt;&gt; Authors,<br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; The document should include a discussion of the relationship b=
etween<br>
&gt;&gt;&gt; IPv6 addresses and SIDs. For example:<br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; * From what address space can SIDs be drawn? Link local? Multi=
cast? ULA?<br>
&gt;&gt;&gt; * Can a locator be longer than 64 bits? If so, how can the res=
t of the<br>
&gt;&gt;&gt;=C2=A0 =C2=A0/64 be used?<br>
&gt;&gt; <br>
&gt;&gt; I&#39;m not saying that this shouldn&#39;t be done or that it is a=
 bad idea, <br>
&gt;&gt; but I&#39;m curious if is anybody looking at this from a higher le=
vel?<br>
&gt;&gt; (these seems pretty architectural to me)<br>
&gt;&gt; <br>
&gt;&gt; Thanks,<br>
&gt;&gt; --<br>
&gt;&gt; Fernando Gont<br>
&gt;&gt; SI6 Networks<br>
&gt;&gt; e-mail: <a href=3D"mailto:fgont@si6networks.com" target=3D"_blank"=
>fgont@si6networks.com</a><br>
&gt;&gt; PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492=
<br>
&gt;&gt; <br>
&gt;&gt; <br>
&gt; <br>
&gt; [Gyan] The SRv6 SID format is below:<br>
&gt; <br>
&gt; So from an IPv6 data plane forwarding perspective the fixed length 64 =
bit Locator is copied hop by hop into the destination address of the IPv6 h=
eader to the tail end FEC destination egress PE and during failover Ti-LFA =
kicks in additional EH is inserted {violating RFC 8200} at the PLR NNHOP to=
 the similar to RLFA PQ node.<br>
&gt; <br>
&gt; So with SRV6 native traffic engineering the locator is either the phys=
ical IP on ingress interface along each hop or loopback along each hop and =
so is either a GUA or ULA but not LL or multicast address is what I underst=
and from a technical standpoint.<br>
&gt; <br>
&gt; From everything I have read the SID is fixed at 64 bit length maximum =
but I guess you can have a smaller then 64 bit locator.<br>
&gt; <br>
&gt; I am working on getting this setup in the lab now so that will really =
help understand the real world implementations.<br>
&gt; <br>
&gt; SRv6 SID format:<br>
&gt; <br>
&gt; 128-bits Segment IDs can be used and allocated for different purposes,=
 for example:<br>
&gt; =E2=80=A2 The first 64 bits can be used to direct traffic to a specifi=
c node <br>
&gt; in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D of the progra=
m =E2=80=A2 The next 32 bits can <br>
&gt; be used to enforce some actions on the traffic =E2=80=93 the =E2=80=9C=
function=E2=80=9Dpart =E2=80=A2 <br>
&gt; The remaining 32 bits can be used to pass some additional information =
<br>
&gt; =E2=80=93 the =E2=80=9Cargument=E2=80=9D part 128-bit SRv6 SID<br>
&gt; Locator: routed to the node performing the function Function: any <br>
&gt; possible function Flexible bit-length selection<br>
&gt; <br>
&gt;&gt; <br>
&gt;&gt; _______________________________________________<br>
&gt;&gt; spring mailing list<br>
&gt;&gt; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.o=
rg</a><br>
&gt;&gt; <a href=3D"https://urldefense.com/v3/__https://www.ietf.org/mailma=
n/listinfo/spr" rel=3D"noreferrer" target=3D"_blank">https://urldefense.com=
/v3/__https://www.ietf.org/mailman/listinfo/spr</a><br>
&gt;&gt; i <br>
&gt;&gt; ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZGQRTz6hag6LoS=
zz8<br>
&gt;&gt; K<br>
&gt;&gt; kBJW9qEVHARw$<br>
<br>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
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</blockquote></div>

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To: Robert Raszuk <robert@raszuk.net>
CC: Gyan Mishra <hayabusagsm@gmail.com>, Ron Bonica <rbonica@juniper.net>, Fernando Gont <fgont@si6networks.com>, SPRING WG List <spring@ietf.org>
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From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 10 Oct 2019 14:17:48 +0200
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To: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
Cc: Gyan Mishra <hayabusagsm@gmail.com>, Ron Bonica <rbonica@juniper.net>,  Fernando Gont <fgont@si6networks.com>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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> can have only one ACL entry in ingress PE to filter malicious traffic
target toward nodes inside SRv6 domain, so it is easy;

That is elementary best practice configuration regardless if you are
running SRv6 or not. It would be very dangerous to allow reachability to
your infrastructure addresses from outside in any real network.

Thx,
R.



On Thu, Oct 10, 2019 at 1:03 PM Wang, Weibin (NSB - CN/Shanghai) <
weibin.wang@nokia-sbell.com> wrote:

> Of course, you can do that like your description, but that may lead to
> complicatedness, because you had better enable security measure for DDOS =
on
> SID within SRv6 domain when deploying SRv6, if you have a dedicated and
> separate SRv6 SID block, you can have only one ACL entry in ingress PE to
> filter malicious traffic target toward nodes inside SRv6 domain, so it is
> easy;
>
>
>
> And if the SID represent Adj-SID such as END.X, and in further if you can
> not advertised it with IGP, but anyway it will lead to complexity, becaus=
e
> you have to use a Node-SID plus Adj-SID to represent the link segment.
>
>
>
> I think, if you have assign a SID prefix to a Node (SID block + parent
> Node ID),  all SRv6 SIDs instantiated in this Node will be covered within
> the SID prefix, so all what the Node have to do is  only advertisement fo=
r
> this SID prefix.
>
>
>
> --------------------------------------
>
> *Cheers !*
>
>
>
>
>
> *WANG Weibin  *
>
>
>
> *From:* Robert Raszuk <robert@raszuk.net>
> *Sent:* 2019=E5=B9=B410=E6=9C=8810=E6=97=A5 17:05
> *To:* Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>
> *Cc:* Gyan Mishra <hayabusagsm@gmail.com>; Ron Bonica <rbonica@juniper.ne=
t>;
> Fernando Gont <fgont@si6networks.com>; SPRING WG List <spring@ietf.org>
> *Subject:* Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6
> Addresses and SIDs
>
>
>
> > so they are not overlap each other, but Both of them must advertised by
> IGP or BGP protocol
>
>
>
> While it is an option it is not "must". You can use your regular routing
> addresses as SID locators and it perfectly ok for SRv6 and routing locato=
rs
> to be identical.
>
>
>
> Of course if you want to to create separate address spaces it is fine as
> well.
>
>
>
> Thx,
>
> R.
>
>
>
>
>
> On Thu, Oct 10, 2019 at 10:44 AM Wang, Weibin (NSB - CN/Shanghai) <
> weibin.wang@nokia-sbell.com> wrote:
>
> The key character of SRv6 is the SRv6 SID has capability of routable
> function, it is reachable according to FIBv6, so the SIDs, I think, must =
be
> allocated from unicast IPv6 address space, because the SRv6 domain is
> limited and controlled by operator, such as deploying it within it's AS
> domain, so ULA as well GUA, I think, are also options for SRv6 SID; and t=
he
> SID block is separate from plain IPv6 address block which are usually
> configured under Node's interfaces; so they are not overlap each other, b=
ut
> Both of them must advertised by IGP or BGP protocol, they perform differe=
nt
> function within network; how to allocate the SID and how to indicate leng=
th
> of SID prefix May be up to operator and its specific network scenario.
>
> --------------------------------------
> Cheers !
>
>
> WANG Weibin
>
> -----Original Message-----
> From: spring <spring-bounces@ietf.org> On Behalf Of Gyan Mishra
> Sent: 2019=E5=B9=B410=E6=9C=8810=E6=97=A5 10:58
> To: Ron Bonica <rbonica@juniper.net>
> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List <spring@ietf.or=
g
> >
> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6
> Addresses and SIDs
>
>
> Hi Ron,
>
> I read that as well in my SRv6 studies so thinking about it logically fro=
m
> an IGP ospf or ISIS longest match routing IPv6 FIB entry perspective for =
me
> makes sense to understand the SRv6 IPv6 data plane.  So I think my
> interpretation is that the 128 bit SID is broken up into hierarchy fields
> with intelligence but from a routing perspective it=E2=80=99s an IPv6 add=
ress of a
> connected interface on a P or PE router which is a /127 for p2p links
> however it defines your =E2=80=9Cnext hop=E2=80=9D NH or =E2=80=9Cnext ne=
xt hop=E2=80=9D NNH in the legacy
> MPLS TE FRR node or path protection or IP-LFA/Remote LFA or you can think
> of it like a MPLS TE autoroute or FA (forwarding adjacencies) and to use
> that path you have to static next hop to the tunnel but in this SRv6 case
> it=E2=80=99s a next hop IPv6 address which is a full 128 bit address that=
 is in the
> SID entry in the SID list as the next hop for your FEC destination in the
> IPv6 FIB entry.
>
> To make this easier for me to understand the SRv6 spec and how to
> interpret lets think of an example of a service provider core with an IPv=
6
> data plane path between ingress PE and egress and a egress FEC which is t=
he
> loopback0 for your ibgp peering vpn services which is the IPv6 destinatio=
n
> last SID entry in the SID list which the one hop prior P would do it=E2=
=80=99s
> normal PSP similar to PHP in the mpls world.  So now imagine each P route=
r
> along the path to the destination PE has a bunch of /127 p2p links.  So n=
ow
> the 1st SID entry would be to the next hop P from the originating PE that
> inserted the EH routing type 4 header SRH to source route the traffic alo=
ng
> the engineered path.  So now if you examine that 1st SID entry it is a 12=
8
> bit address with embedded information such as the function and arguments =
in
> the station id so the actual IPv6 FIB entry for the egress PE FEC
> destination would have a next hop of the P router which is the SID what t=
he
> 1st SID contains which is a 128 bit address to route to the 1st node whic=
h
> is the next hop PE. Once the packet arrives at the 1st node in the case t=
he
> ingress P the station id IID is decoded for any functions or argument the
> need to be executed by the instruction PSSI.
>
> That=E2=80=99s my interpretation but I have to build this out in the lab =
do dig
> deeper into the bits and bytes.
>
> Cheers,
>
> Gyan
>
> Sent from my iPhone
>
> > On Oct 9, 2019, at 8:02 PM, Ron Bonica <rbonica@juniper.net> wrote:
> >
> > Gyan,
> >
> > If the Locator were guaranteed to be 64 bits, as you suggest, there
> would be no problem. However, the following text from Section 3.1 suggest=
s
> otherwise.
> >
> > "   An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is the =
L
> >   most significant bits and FUNCT (function) is the 128-L least
> >   significant bits of the SID.  L is called the locator length and is
> >   flexible.  Each operator is free to use the locator length it
> >   chooses.  Most often the locator is routable and leads to the node
> >   which instantiates that SID.  A control-plane protocol might
> >   represent the locator as B:N where B is the SRv6 SID block (IPv6
> >   subnet allocated for SRv6 SIDs by the operator) and N is the
> >   identifier of the parent node."
> >
> >                                                                    Ron
> >
> >
> >
> > Juniper Business Use Only
> >
> > -----Original Message-----
> > From: Gyan Mishra <hayabusagsm@gmail.com>
> > Sent: Wednesday, October 9, 2019 7:21 PM
> > To: Ron Bonica <rbonica@juniper.net>
> > Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List
> > <spring@ietf.org>
> > Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
> > IPv6 Addresses and SIDs
> >
> >
> >
> > In-line comments
> >
> > Thanks
> >
> > Gyan
> >
> > Sent from my iPhone
> >
> >> On Oct 3, 2019, at 12:25 PM, Ron Bonica <rbonica=3D
> 40juniper.net@dmarc.ietf.org> wrote:
> >>
> >> Fernando,
> >>
> >> Someone should. I think that the expertise to do this is in 6man.
> >>
> >>                                 Ron
> >>
> >>
> >> Juniper Business Use Only
> >>
> >> -----Original Message-----
> >> From: Fernando Gont <fgont@si6networks.com>
> >> Sent: Wednesday, October 2, 2019 3:11 PM
> >> To: Ron Bonica <rbonica@juniper.net>; SPRING WG List
> >> <spring@ietf.org>
> >> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
> >> IPv6 Addresses and SIDs
> >>
> >>> On 1/10/19 23:30, Ron Bonica wrote:
> >>> Authors,
> >>>
> >>>
> >>>
> >>> The document should include a discussion of the relationship between
> >>> IPv6 addresses and SIDs. For example:
> >>>
> >>>
> >>>
> >>> * From what address space can SIDs be drawn? Link local? Multicast?
> ULA?
> >>> * Can a locator be longer than 64 bits? If so, how can the rest of th=
e
> >>>   /64 be used?
> >>
> >> I'm not saying that this shouldn't be done or that it is a bad idea,
> >> but I'm curious if is anybody looking at this from a higher level?
> >> (these seems pretty architectural to me)
> >>
> >> Thanks,
> >> --
> >> Fernando Gont
> >> SI6 Networks
> >> e-mail: fgont@si6networks.com
> >> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
> >>
> >>
> >
> > [Gyan] The SRv6 SID format is below:
> >
> > So from an IPv6 data plane forwarding perspective the fixed length 64
> bit Locator is copied hop by hop into the destination address of the IPv6
> header to the tail end FEC destination egress PE and during failover Ti-L=
FA
> kicks in additional EH is inserted {violating RFC 8200} at the PLR NNHOP =
to
> the similar to RLFA PQ node.
> >
> > So with SRV6 native traffic engineering the locator is either the
> physical IP on ingress interface along each hop or loopback along each ho=
p
> and so is either a GUA or ULA but not LL or multicast address is what I
> understand from a technical standpoint.
> >
> > From everything I have read the SID is fixed at 64 bit length maximum
> but I guess you can have a smaller then 64 bit locator.
> >
> > I am working on getting this setup in the lab now so that will really
> help understand the real world implementations.
> >
> > SRv6 SID format:
> >
> > 128-bits Segment IDs can be used and allocated for different purposes,
> for example:
> > =E2=80=A2 The first 64 bits can be used to direct traffic to a specific=
 node
> > in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D of the program=
 =E2=80=A2 The next 32 bits can
> > be used to enforce some actions on the traffic =E2=80=93 the =E2=80=9Cf=
unction=E2=80=9Dpart =E2=80=A2
> > The remaining 32 bits can be used to pass some additional information
> > =E2=80=93 the =E2=80=9Cargument=E2=80=9D part 128-bit SRv6 SID
> > Locator: routed to the node performing the function Function: any
> > possible function Flexible bit-length selection
> >
> >>
> >> _______________________________________________
> >> spring mailing list
> >> spring@ietf.org
> >> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spr
> <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/spr>
> >> i
> >> ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZGQRTz6hag6LoSzz8
> >> K
> >> kBJW9qEVHARw$
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>
>

--0000000000009804b805948d6476
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><span style=3D"font-family:Calibri,sans-serif;font-size:14=
px">&gt; can have only one ACL entry in ingress PE to filter malicious traf=
fic target toward nodes inside SRv6 domain, so it is easy;</span>=C2=A0=C2=
=A0<br><div><br></div><div>That is elementary best practice=C2=A0configurat=
ion regardless if you are running SRv6 or not. It would be very dangerous t=
o allow reachability to your infrastructure addresses from outside in any r=
eal network.=C2=A0</div><div><br></div><div>Thx,<br>R.</div><div><br></div>=
<div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Thu, Oct 10, 2019 at 1:03 PM Wang, Weibin (NSB - CN/Shan=
ghai) &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com">weibin.wang@nokia-=
sbell.com</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">





<div lang=3D"ZH-CN">
<div class=3D"gmail-m_8453835362738495936WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif">Of course, you can do that like your description=
, but that may lead to complicatedness, because you had better enable secur=
ity measure for DDOS on SID within SRv6
 domain when deploying SRv6, if you have a dedicated and separate SRv6 SID =
block, you can have only one ACL entry in ingress PE to filter malicious tr=
affic target toward nodes inside SRv6 domain, so it is easy;<u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif">And if the SID represent Adj-SID such as END.X, =
and in further if you can not advertised it with IGP, but anyway it will le=
ad to complexity, because you have to
 use a Node-SID plus Adj-SID to represent the link segment.<u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif">I think, if you have assign a SID prefix to a No=
de (SID block + parent Node ID), =C2=A0all SRv6 SIDs instantiated in this N=
ode will be covered within the SID prefix,
 so all what the Node have to do is =C2=A0only advertisement for this SID p=
refix.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;font-family:Calibri,sans-serif">-------------------=
-------------------<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><i><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,serif">C=
heers !<u></u><u></u></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;font-family:Calibri,sans-serif"><u></u>=C2=A0<u></u=
></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><b><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:Arial,sans-serif"><u></u>=C2=A0<u></=
u></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><b><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,serif">W=
ANG Weibin=C2=A0
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11pt;font=
-family:Calibri,sans-serif">From:</span></b><span lang=3D"EN-US" style=3D"f=
ont-size:11pt;font-family:Calibri,sans-serif"> Robert Raszuk &lt;<a href=3D=
"mailto:robert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> 2019</span><span style=3D"font-size:11pt">=E5=B9=B4</span><spa=
n lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif">10=
</span><span style=3D"font-size:11pt">=E6=9C=88</span><span lang=3D"EN-US" =
style=3D"font-size:11pt;font-family:Calibri,sans-serif">10</span><span styl=
e=3D"font-size:11pt">=E6=97=A5</span><span lang=3D"EN-US" style=3D"font-siz=
e:11pt;font-family:Calibri,sans-serif">
 17:05<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com" target=3D"_blank">weibin.wang@nokia-sbell.com</a>&gt;<b=
r>
<b>Cc:</b> Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.com" target=
=3D"_blank">hayabusagsm@gmail.com</a>&gt;; Ron Bonica &lt;<a href=3D"mailto=
:rbonica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt;; Fernan=
do Gont &lt;<a href=3D"mailto:fgont@si6networks.com" target=3D"_blank">fgon=
t@si6networks.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf=
.org" target=3D"_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming - I=
Pv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&gt; so they are not overlap ea=
ch other, but Both of them must advertised by IGP or BGP protocol=C2=A0=C2=
=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">While it is an option it is not=
 &quot;must&quot;. You can use your regular routing addresses as SID locato=
rs and it perfectly ok for SRv6 and routing locators to be identical.=C2=A0=
<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Of course if you want to to=C2=
=A0create separate address spaces it is fine as well.=C2=A0<u></u><u></u></=
span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thx,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Thu, Oct 10, 2019 at 10:44 A=
M Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wang@nokia-=
sbell.com" target=3D"_blank">weibin.wang@nokia-sbell.com</a>&gt; wrote:<u><=
/u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
<p class=3D"MsoNormal"><span lang=3D"EN-US">The key character of SRv6 is th=
e SRv6 SID has capability of routable function, it is reachable according t=
o FIBv6, so the SIDs, I think, must be allocated from unicast IPv6 address =
space, because the SRv6 domain is limited
 and controlled by operator, such as deploying it within it&#39;s AS domain=
, so ULA as well GUA, I think, are also options for SRv6 SID; and the SID b=
lock is separate from plain IPv6 address block which are usually configured=
 under Node&#39;s interfaces; so they are
 not overlap each other, but Both of them must advertised by IGP or BGP pro=
tocol, they perform different function within network; how to allocate the =
SID and how to indicate length of SID prefix May be up to operator and its =
specific network scenario.<br>
<br>
--------------------------------------<br>
Cheers !<br>
<br>
<br>
WANG Weibin=C2=A0 <br>
<br>
-----Original Message-----<br>
From: spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" target=3D"_blan=
k">spring-bounces@ietf.org</a>&gt; On Behalf Of Gyan Mishra<br>
Sent: 2019</span>=E5=B9=B4<span lang=3D"EN-US">10</span>=E6=9C=88<span lang=
=3D"EN-US">10</span>=E6=97=A5<span lang=3D"EN-US"> 10:58<br>
To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_blank"=
>rbonica@juniper.net</a>&gt;<br>
Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com" target=3D"_b=
lank">fgont@si6networks.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:s=
pring@ietf.org" target=3D"_blank">spring@ietf.org</a>&gt;<br>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Add=
resses and SIDs<br>
<br>
<br>
Hi Ron, <br>
<br>
I read that as well in my SRv6 studies so thinking about it logically from =
an IGP ospf or ISIS longest match routing IPv6 FIB entry perspective for me=
 makes sense to understand the SRv6 IPv6 data plane.=C2=A0 So I think my in=
terpretation is that the 128 bit SID
 is broken up into hierarchy fields with intelligence but from a routing pe=
rspective it=E2=80=99s an IPv6 address of a connected interface on a P or P=
E router which is a /127 for p2p links however it defines your =E2=80=9Cnex=
t hop=E2=80=9D NH or =E2=80=9Cnext next hop=E2=80=9D NNH in the legacy MPLS
 TE FRR node or path protection or IP-LFA/Remote LFA or you can think of it=
 like a MPLS TE autoroute or FA (forwarding adjacencies) and to use that pa=
th you have to static next hop to the tunnel but in this SRv6 case it=E2=80=
=99s a next hop IPv6 address which is a
 full 128 bit address that is in the SID entry in the SID list as the next =
hop for your FEC destination in the IPv6 FIB entry.<br>
<br>
To make this easier for me to understand the SRv6 spec and how to interpret=
 lets think of an example of a service provider core with an IPv6 data plan=
e path between ingress PE and egress and a egress FEC which is the loopback=
0 for your ibgp peering vpn services
 which is the IPv6 destination last SID entry in the SID list which the one=
 hop prior P would do it=E2=80=99s normal PSP similar to PHP in the mpls wo=
rld.=C2=A0 So now imagine each P router along the path to the destination P=
E has a bunch of /127 p2p links.=C2=A0 So now the
 1st SID entry would be to the next hop P from the originating PE that inse=
rted the EH routing type 4 header SRH to source route the traffic along the=
 engineered path.=C2=A0 So now if you examine that 1st SID entry it is a 12=
8 bit address with embedded information
 such as the function and arguments in the station id so the actual IPv6 FI=
B entry for the egress PE FEC destination would have a next hop of the P ro=
uter which is the SID what the 1st SID contains which is a 128 bit address =
to route to the 1st node which is
 the next hop PE. Once the packet arrives at the 1st node in the case the i=
ngress P the station id IID is decoded for any functions or argument the ne=
ed to be executed by the instruction PSSI.
<br>
<br>
That=E2=80=99s my interpretation but I have to build this out in the lab do=
 dig deeper into the bits and bytes.=C2=A0
<br>
<br>
Cheers,<br>
<br>
Gyan<br>
<br>
Sent from my iPhone<br>
<br>
&gt; On Oct 9, 2019, at 8:02 PM, Ron Bonica &lt;<a href=3D"mailto:rbonica@j=
uniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt; wrote:<br>
&gt; <br>
&gt; Gyan,<br>
&gt; <br>
&gt; If the Locator were guaranteed to be 64 bits, as you suggest, there wo=
uld be no problem. However, the following text from Section 3.1 suggests ot=
herwise.<br>
&gt; <br>
&gt; &quot;=C2=A0 =C2=A0An SRv6 SID is represented as LOC:FUNCT where LOC (=
locator) is the L<br>
&gt;=C2=A0 =C2=A0most significant bits and FUNCT (function) is the 128-L le=
ast<br>
&gt;=C2=A0 =C2=A0significant bits of the SID.=C2=A0 L is called the locator=
 length and is<br>
&gt;=C2=A0 =C2=A0flexible.=C2=A0 Each operator is free to use the locator l=
ength it<br>
&gt;=C2=A0 =C2=A0chooses.=C2=A0 Most often the locator is routable and lead=
s to the node<br>
&gt;=C2=A0 =C2=A0which instantiates that SID.=C2=A0 A control-plane protoco=
l might<br>
&gt;=C2=A0 =C2=A0represent the locator as B:N where B is the SRv6 SID block=
 (IPv6<br>
&gt;=C2=A0 =C2=A0subnet allocated for SRv6 SIDs by the operator) and N is t=
he<br>
&gt;=C2=A0 =C2=A0identifier of the parent node.&quot;<br>
&gt; <br>
&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 Ron<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; Juniper Business Use Only<br>
&gt; <br>
&gt; -----Original Message-----<br>
&gt; From: Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.com" target=
=3D"_blank">hayabusagsm@gmail.com</a>&gt;<br>
&gt; Sent: Wednesday, October 9, 2019 7:21 PM<br>
&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_b=
lank">rbonica@juniper.net</a>&gt;<br>
&gt; Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com" target=
=3D"_blank">fgont@si6networks.com</a>&gt;; SPRING WG List
<br>
&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.o=
rg</a>&gt;<br>
&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - <br=
>
&gt; IPv6 Addresses and SIDs<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; In-line comments<br>
&gt; <br>
&gt; Thanks<br>
&gt; <br>
&gt; Gyan<br>
&gt; <br>
&gt; Sent from my iPhone<br>
&gt; <br>
&gt;&gt; On Oct 3, 2019, at 12:25 PM, Ron Bonica &lt;rbonica=3D<a href=3D"m=
ailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40juniper.net@dmarc.i=
etf.org</a>&gt; wrote:<br>
&gt;&gt; <br>
&gt;&gt; Fernando,<br>
&gt;&gt; <br>
&gt;&gt; Someone should. I think that the expertise to do this is in 6man.<=
br>
&gt;&gt; <br>
&gt;&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=A0Ron<br>
&gt;&gt; <br>
&gt;&gt; <br>
&gt;&gt; Juniper Business Use Only<br>
&gt;&gt; <br>
&gt;&gt; -----Original Message-----<br>
&gt;&gt; From: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com" t=
arget=3D"_blank">fgont@si6networks.com</a>&gt;<br>
&gt;&gt; Sent: Wednesday, October 2, 2019 3:11 PM<br>
&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=
=3D"_blank">rbonica@juniper.net</a>&gt;; SPRING WG List
<br>
&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ie=
tf.org</a>&gt;<br>
&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -=
<br>
&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt; <br>
&gt;&gt;&gt; On 1/10/19 23:30, Ron Bonica wrote:<br>
&gt;&gt;&gt; Authors,<br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; The document should include a discussion of the relationship b=
etween<br>
&gt;&gt;&gt; IPv6 addresses and SIDs. For example:<br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; <br>
&gt;&gt;&gt; * From what address space can SIDs be drawn? Link local? Multi=
cast? ULA?<br>
&gt;&gt;&gt; * Can a locator be longer than 64 bits? If so, how can the res=
t of the<br>
&gt;&gt;&gt;=C2=A0 =C2=A0/64 be used?<br>
&gt;&gt; <br>
&gt;&gt; I&#39;m not saying that this shouldn&#39;t be done or that it is a=
 bad idea, <br>
&gt;&gt; but I&#39;m curious if is anybody looking at this from a higher le=
vel?<br>
&gt;&gt; (these seems pretty architectural to me)<br>
&gt;&gt; <br>
&gt;&gt; Thanks,<br>
&gt;&gt; --<br>
&gt;&gt; Fernando Gont<br>
&gt;&gt; SI6 Networks<br>
&gt;&gt; e-mail: <a href=3D"mailto:fgont@si6networks.com" target=3D"_blank"=
>fgont@si6networks.com</a><br>
&gt;&gt; PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492=
<br>
&gt;&gt; <br>
&gt;&gt; <br>
&gt; <br>
&gt; [Gyan] The SRv6 SID format is below:<br>
&gt; <br>
&gt; So from an IPv6 data plane forwarding perspective the fixed length 64 =
bit Locator is copied hop by hop into the destination address of the IPv6 h=
eader to the tail end FEC destination egress PE and during failover Ti-LFA =
kicks in additional EH is inserted
 {violating RFC 8200} at the PLR NNHOP to the similar to RLFA PQ node.<br>
&gt; <br>
&gt; So with SRV6 native traffic engineering the locator is either the phys=
ical IP on ingress interface along each hop or loopback along each hop and =
so is either a GUA or ULA but not LL or multicast address is what I underst=
and from a technical standpoint.<br>
&gt; <br>
&gt; From everything I have read the SID is fixed at 64 bit length maximum =
but I guess you can have a smaller then 64 bit locator.<br>
&gt; <br>
&gt; I am working on getting this setup in the lab now so that will really =
help understand the real world implementations.<br>
&gt; <br>
&gt; SRv6 SID format:<br>
&gt; <br>
&gt; 128-bits Segment IDs can be used and allocated for different purposes,=
 for example:<br>
&gt; =E2=80=A2 The first 64 bits can be used to direct traffic to a specifi=
c node <br>
&gt; in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D of the progra=
m =E2=80=A2 The next 32 bits can <br>
&gt; be used to enforce some actions on the traffic =E2=80=93 the =E2=80=9C=
function=E2=80=9Dpart =E2=80=A2 <br>
&gt; The remaining 32 bits can be used to pass some additional information =
<br>
&gt; =E2=80=93 the =E2=80=9Cargument=E2=80=9D part 128-bit SRv6 SID<br>
&gt; Locator: routed to the node performing the function Function: any <br>
&gt; possible function Flexible bit-length selection<br>
&gt; <br>
&gt;&gt; <br>
&gt;&gt; _______________________________________________<br>
&gt;&gt; spring mailing list<br>
&gt;&gt; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.o=
rg</a><br>
&gt;&gt; <a href=3D"https://urldefense.com/v3/__https:/www.ietf.org/mailman=
/listinfo/spr" target=3D"_blank">
https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spr</a><b=
r>
&gt;&gt; i <br>
&gt;&gt; ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZGQRTz6hag6LoS=
zz8<br>
&gt;&gt; K<br>
&gt;&gt; kBJW9qEVHARw$<br>
<br>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" target=3D"_blank">=
https://www.ietf.org/mailman/listinfo/spring</a><br>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" target=3D"_blank">=
https://www.ietf.org/mailman/listinfo/spring</a><u></u><u></u></span></p>
</blockquote>
</div>
</div>
</div>

</blockquote></div>

--0000000000009804b805948d6476--


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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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Makes sense.  I think from Ron=E2=80=99s question is types address which wou=
ld have to be a GUA or ULA IPv6 URIB FIB routeable 128 bit prefix so that wo=
uld exclude multicast or link local since the prefix has to a unicast addres=
s and routable and reachable within the domain.

Ron

I can take this back to 6MAN WG with regards to SID address types and struct=
ure should be defined clearly as it is not today.  Agreed.

Thanks=20

Gyan

Sent from my iPhone

> On Oct 10, 2019, at 4:44 AM, Wang, Weibin (NSB - CN/Shanghai) <weibin.wang=
@nokia-sbell.com> wrote:
>=20
> The key character of SRv6 is the SRv6 SID has capability of routable funct=
ion, it is reachable according to FIBv6, so the SIDs, I think, must be alloc=
ated from unicast IPv6 address space, because the SRv6 domain is limited and=
 controlled by operator, such as deploying it within it's AS domain, so ULA a=
s well GUA, I think, are also options for SRv6 SID; and the SID block is sep=
arate from plain IPv6 address block which are usually configured under Node'=
s interfaces; so they are not overlap each other, but Both of them must adve=
rtised by IGP or BGP protocol, they perform different function within networ=
k; how to allocate the SID and how to indicate length of SID prefix May be u=
p to operator and its specific network scenario.
>=20
> --------------------------------------
> Cheers !
>=20
>=20
> WANG Weibin =20
>=20
> -----Original Message-----
> From: spring <spring-bounces@ietf.org> On Behalf Of Gyan Mishra
> Sent: 2019=E5=B9=B410=E6=9C=8810=E6=97=A5 10:58
> To: Ron Bonica <rbonica@juniper.net>
> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List <spring@ietf.org=
>
> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Ad=
dresses and SIDs
>=20
>=20
> Hi Ron,=20
>=20
> I read that as well in my SRv6 studies so thinking about it logically from=
 an IGP ospf or ISIS longest match routing IPv6 FIB entry perspective for me=
 makes sense to understand the SRv6 IPv6 data plane.  So I think my interpre=
tation is that the 128 bit SID is broken up into hierarchy fields with intel=
ligence but from a routing perspective it=E2=80=99s an IPv6 address of a con=
nected interface on a P or PE router which is a /127 for p2p links however i=
t defines your =E2=80=9Cnext hop=E2=80=9D NH or =E2=80=9Cnext next hop=E2=80=
=9D NNH in the legacy MPLS TE FRR node or path protection or IP-LFA/Remote L=
FA or you can think of it like a MPLS TE autoroute or FA (forwarding adjacen=
cies) and to use that path you have to static next hop to the tunnel but in t=
his SRv6 case it=E2=80=99s a next hop IPv6 address which is a full 128 bit a=
ddress that is in the SID entry in the SID list as the next hop for your FEC=
 destination in the IPv6 FIB entry.
>=20
> To make this easier for me to understand the SRv6 spec and how to interpre=
t lets think of an example of a service provider core with an IPv6 data plan=
e path between ingress PE and egress and a egress FEC which is the loopback0=
 for your ibgp peering vpn services which is the IPv6 destination last SID e=
ntry in the SID list which the one hop prior P would do it=E2=80=99s normal P=
SP similar to PHP in the mpls world.  So now imagine each P router along the=
 path to the destination PE has a bunch of /127 p2p links.  So now the 1st S=
ID entry would be to the next hop P from the originating PE that inserted th=
e EH routing type 4 header SRH to source route the traffic along the enginee=
red path.  So now if you examine that 1st SID entry it is a 128 bit address w=
ith embedded information such as the function and arguments in the station i=
d so the actual IPv6 FIB entry for the egress PE FEC destination would have a=
 next hop of the P router which is the SID what the 1st SID contains which i=
s a 128 bit address to route to the 1st node which is the next hop PE. Once t=
he packet arrives at the 1st node in the case the ingress P the station id I=
ID is decoded for any functions or argument the need to be executed by the i=
nstruction PSSI.=20
>=20
> That=E2=80=99s my interpretation but I have to build this out in the lab d=
o dig deeper into the bits and bytes. =20
>=20
> Cheers,
>=20
> Gyan
>=20
> Sent from my iPhone
>=20
>> On Oct 9, 2019, at 8:02 PM, Ron Bonica <rbonica@juniper.net> wrote:
>>=20
>> Gyan,
>>=20
>> If the Locator were guaranteed to be 64 bits, as you suggest, there would=
 be no problem. However, the following text from Section 3.1 suggests otherw=
ise.
>>=20
>> "   An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is the L
>>  most significant bits and FUNCT (function) is the 128-L least
>>  significant bits of the SID.  L is called the locator length and is
>>  flexible.  Each operator is free to use the locator length it
>>  chooses.  Most often the locator is routable and leads to the node
>>  which instantiates that SID.  A control-plane protocol might
>>  represent the locator as B:N where B is the SRv6 SID block (IPv6
>>  subnet allocated for SRv6 SIDs by the operator) and N is the
>>  identifier of the parent node."
>>=20
>>                                                                   Ron
>>=20
>>=20
>>=20
>> Juniper Business Use Only
>>=20
>> -----Original Message-----
>> From: Gyan Mishra <hayabusagsm@gmail.com>
>> Sent: Wednesday, October 9, 2019 7:21 PM
>> To: Ron Bonica <rbonica@juniper.net>
>> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List=20
>> <spring@ietf.org>
>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -=20
>> IPv6 Addresses and SIDs
>>=20
>>=20
>>=20
>> In-line comments
>>=20
>> Thanks
>>=20
>> Gyan
>>=20
>> Sent from my iPhone
>>=20
>>> On Oct 3, 2019, at 12:25 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.i=
etf.org> wrote:
>>>=20
>>> Fernando,
>>>=20
>>> Someone should. I think that the expertise to do this is in 6man.
>>>=20
>>>                                Ron
>>>=20
>>>=20
>>> Juniper Business Use Only
>>>=20
>>> -----Original Message-----
>>> From: Fernando Gont <fgont@si6networks.com>
>>> Sent: Wednesday, October 2, 2019 3:11 PM
>>> To: Ron Bonica <rbonica@juniper.net>; SPRING WG List=20
>>> <spring@ietf.org>
>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
>>> IPv6 Addresses and SIDs
>>>=20
>>>> On 1/10/19 23:30, Ron Bonica wrote:
>>>> Authors,
>>>>=20
>>>>=20
>>>>=20
>>>> The document should include a discussion of the relationship between
>>>> IPv6 addresses and SIDs. For example:
>>>>=20
>>>>=20
>>>>=20
>>>> * =46rom what address space can SIDs be drawn? Link local? Multicast? U=
LA?
>>>> * Can a locator be longer than 64 bits? If so, how can the rest of the
>>>>  /64 be used?
>>>=20
>>> I'm not saying that this shouldn't be done or that it is a bad idea,=20
>>> but I'm curious if is anybody looking at this from a higher level?
>>> (these seems pretty architectural to me)
>>>=20
>>> Thanks,
>>> --
>>> Fernando Gont
>>> SI6 Networks
>>> e-mail: fgont@si6networks.com
>>> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>>>=20
>>>=20
>>=20
>> [Gyan] The SRv6 SID format is below:
>>=20
>> So from an IPv6 data plane forwarding perspective the fixed length 64 bit=
 Locator is copied hop by hop into the destination address of the IPv6 heade=
r to the tail end FEC destination egress PE and during failover Ti-LFA kicks=
 in additional EH is inserted {violating RFC 8200} at the PLR NNHOP to the s=
imilar to RLFA PQ node.
>>=20
>> So with SRV6 native traffic engineering the locator is either the physica=
l IP on ingress interface along each hop or loopback along each hop and so i=
s either a GUA or ULA but not LL or multicast address is what I understand f=
rom a technical standpoint.
>>=20
>> =46rom everything I have read the SID is fixed at 64 bit length maximum b=
ut I guess you can have a smaller then 64 bit locator.
>>=20
>> I am working on getting this setup in the lab now so that will really hel=
p understand the real world implementations.
>>=20
>> SRv6 SID format:
>>=20
>> 128-bits Segment IDs can be used and allocated for different purposes, fo=
r example:
>> =E2=80=A2 The first 64 bits can be used to direct traffic to a specific n=
ode=20
>> in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D of the program =E2=
=80=A2 The next 32 bits can=20
>> be used to enforce some actions on the traffic =E2=80=93 the =E2=80=9Cfun=
ction=E2=80=9Dpart =E2=80=A2=20
>> The remaining 32 bits can be used to pass some additional information=20
>> =E2=80=93 the =E2=80=9Cargument=E2=80=9D part 128-bit SRv6 SID
>> Locator: routed to the node performing the function Function: any=20
>> possible function Flexible bit-length selection
>>=20
>>>=20
>>> _______________________________________________
>>> spring mailing list
>>> spring@ietf.org
>>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spr
>>> i=20
>>> ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZGQRTz6hag6LoSzz8
>>> K
>>> kBJW9qEVHARw$
>=20
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
> _______________________________________________
> spring mailing list
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Section3:
However, when the received route is colored with an extended color
   community 'C' and Next-Hop 'N', and the ingress PE has a valid SRv6
   Policy (C, N) associated with SID list <S1,S2, S3> [I-D.filsfils-
   spring-segment-routing-policy], then the effective SR Policy is <S1,
   S2, S3, SRv6-Service-SID>.


When we make effective SR policy cant we remove S3 from List (S3 and SRv6-S=
ervice-SID both belong to Egress).
effective SR Policy can be <S1,S2, SRv6-Service-SID>.




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<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">Section3:&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">However, when the received route is colored with an extend=
ed color<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; community 'C' and Next-Hop 'N', and the ingre=
ss PE has a valid SRv6<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; Policy (C, N) associated with SID list &lt;S1=
,S2, S3&gt; [I-D.filsfils-<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; spring-segment-routing-policy], then the effe=
ctive SR Policy is &lt;S1,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; S2, S3, SRv6-Service-SID&gt;.<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">When we make effective SR policy cant we remove S3 from=
 List (S3 and SRv6-Service-SID both belong to Egress).<o:p></o:p></span></b=
></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">effective SR Policy can be &lt;S1,S2, SRv6-Service-SID&=
gt;.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<br>
<p class=3D"msipfooter30b3d538" align=3D"Center" style=3D"margin:0"><span s=
tyle=3D"font-size:7.0pt;font-family:Calibri;color:#000000">Juniper Business=
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Wanted to know the use case where we only POP the SRH ?

4.16.1<https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programmi=
ng-04#section-4.16.1>.  PSP: Penultimate Segment Pop of the SRH

   The SRH processing of the End, End.X and End.T behaviors are

   modified: after the instruction "S14.  Update IPv6 DA with Segment

   List[Segments Left]" is executed, the following instructions must be

   executed as well:



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }



Juniper Business Use Only

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<pre>Wanted to know the use case where we only POP the SRH ?<o:p></o:p></pr=
e>
<h4><a name=3D"section-4.16.1"></a><a href=3D"https://tools.ietf.org/html/d=
raft-ietf-spring-srv6-network-programming-04#section-4.16.1"><span style=3D=
"mso-bookmark:&quot;section-4\.16\.1&quot;">4.16.1</span><span style=3D"mso=
-bookmark:&quot;section-4\.16\.1&quot;"></span></a><span style=3D"mso-bookm=
ark:&quot;section-4\.16\.1&quot;"></span><span style=3D"font-family:&quot;C=
ourier New&quot;">.&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><o:p></o:p></h4>
<pre>&nbsp;&nbsp; The SRH processing of the End, End.X and End.T behaviors =
are<o:p></o:p></pre>
<pre>&nbsp;&nbsp; modified: after the instruction &quot;S14.&nbsp; Update I=
Pv6 DA with Segment<o:p></o:p></pre>
<pre>&nbsp;&nbsp; List[Segments Left]&quot; is executed, the following inst=
ructions must be<o:p></o:p></pre>
<pre>&nbsp;&nbsp; executed as well:<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&nbsp;&nbsp; S14.1.&nbsp;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p><=
/pre>
<pre>&nbsp;&nbsp; S14.2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:=
p></pre>
<pre>&nbsp;&nbsp; S14.3.&nbsp;&nbsp; }<o:p></o:p></pre>
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<p class=3D"msipfooter30b3d538" align=3D"Center" style=3D"margin:0"><span s=
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From: li zhenqiang <li_zhenqiang@hotmail.com>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, "spring@ietf.org" <spring@ietf.org>, "ipv6@ietf.org" <ipv6@ietf.org>
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Thread-Topic: Re: [spring] FW: I-D Action: draft-ietf-spring-srv6-network-programming-03.txt
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/o7uJ5BiHY9WKhwL69PwbSVrzw-Q>
Subject: Re: [spring] FW: I-D Action: draft-ietf-spring-srv6-network-programming-03.txt
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Date: Fri, 11 Oct 2019 11:06:18 -0400
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To: Ron Bonica <rbonica@juniper.net>
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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Good point.  I think we need someone who has this in the lab or prod to see t=
he exact implemented behavior.=20

So since the URIB entry for the FEC destination egress PE prefix has the nex=
t hop for the IGP used for IPv6 set to the =E2=80=9Clink local next hop woul=
d the SID entry in the SID list be all link local addresses.

So the SRH header SID list the SID entry=E2=80=99s provide the =E2=80=9Cnext=
 hop=E2=80=9D to source route the traffic to the egress PE. So since normall=
y the IGP next hop is a link local would all the SID entries be link local a=
nd not GUA or ULA. =20

So the destination in the IPv6 packet be traffic engineered would be the L3 v=
pn VRF destination and the FEC to forward to the egress PE that terminates i=
bgp for vpnv4 vpnv6 is the loop /128 on the egress PE but to traffic enginee=
r to get their the SID list would have all the next hops listed similar to a=
 TE ERO explicit route object static LSP.=20

Gyan

Sent from my iPhone

> On Oct 11, 2019, at 10:05 AM, Ron Bonica <rbonica@juniper.net> wrote:
>=20
> Gyan,
>=20
> Why exclude link local for adjacency segments?
>=20
>                            Ron
>=20
>=20
>=20
> Juniper Business Use Only
>=20
> -----Original Message-----
> From: Gyan Mishra <hayabusagsm@gmail.com>=20
> Sent: Thursday, October 10, 2019 12:34 PM
> To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>
> Cc: Ron Bonica <rbonica@juniper.net>; Fernando Gont <fgont@si6networks.com=
>; SPRING WG List <spring@ietf.org>
> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Ad=
dresses and SIDs
>=20
>=20
>=20
> Makes sense.  I think from Ron=E2=80=99s question is types address which w=
ould have to be a GUA or ULA IPv6 URIB FIB routeable 128 bit prefix so that w=
ould exclude multicast or link local since the prefix has to a unicast addre=
ss and routable and reachable within the domain.
>=20
> Ron
>=20
> I can take this back to 6MAN WG with regards to SID address types and stru=
cture should be defined clearly as it is not today.  Agreed.
>=20
> Thanks=20
>=20
> Gyan
>=20
> Sent from my iPhone
>=20
>> On Oct 10, 2019, at 4:44 AM, Wang, Weibin (NSB - CN/Shanghai) <weibin.wan=
g@nokia-sbell.com> wrote:
>>=20
>> The key character of SRv6 is the SRv6 SID has capability of routable func=
tion, it is reachable according to FIBv6, so the SIDs, I think, must be allo=
cated from unicast IPv6 address space, because the SRv6 domain is limited an=
d controlled by operator, such as deploying it within it's AS domain, so ULA=
 as well GUA, I think, are also options for SRv6 SID; and the SID block is s=
eparate from plain IPv6 address block which are usually configured under Nod=
e's interfaces; so they are not overlap each other, but Both of them must ad=
vertised by IGP or BGP protocol, they perform different function within netw=
ork; how to allocate the SID and how to indicate length of SID prefix May be=
 up to operator and its specific network scenario.
>>=20
>> --------------------------------------
>> Cheers !
>>=20
>>=20
>> WANG Weibin
>>=20
>> -----Original Message-----
>> From: spring <spring-bounces@ietf.org> On Behalf Of Gyan Mishra
>> Sent: 2019=E5=B9=B410=E6=9C=8810=E6=97=A5 10:58
>> To: Ron Bonica <rbonica@juniper.net>
>> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List=20
>> <spring@ietf.org>
>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -=20
>> IPv6 Addresses and SIDs
>>=20
>>=20
>> Hi Ron,
>>=20
>> I read that as well in my SRv6 studies so thinking about it logically fro=
m an IGP ospf or ISIS longest match routing IPv6 FIB entry perspective for m=
e makes sense to understand the SRv6 IPv6 data plane.  So I think my interpr=
etation is that the 128 bit SID is broken up into hierarchy fields with inte=
lligence but from a routing perspective it=E2=80=99s an IPv6 address of a co=
nnected interface on a P or PE router which is a /127 for p2p links however i=
t defines your =E2=80=9Cnext hop=E2=80=9D NH or =E2=80=9Cnext next hop=E2=80=
=9D NNH in the legacy MPLS TE FRR node or path protection or IP-LFA/Remote L=
FA or you can think of it like a MPLS TE autoroute or FA (forwarding adjacen=
cies) and to use that path you have to static next hop to the tunnel but in t=
his SRv6 case it=E2=80=99s a next hop IPv6 address which is a full 128 bit a=
ddress that is in the SID entry in the SID list as the next hop for your FEC=
 destination in the IPv6 FIB entry.
>>=20
>> To make this easier for me to understand the SRv6 spec and how to interpr=
et lets think of an example of a service provider core with an IPv6 data pla=
ne path between ingress PE and egress and a egress FEC which is the loopback=
0 for your ibgp peering vpn services which is the IPv6 destination last SID e=
ntry in the SID list which the one hop prior P would do it=E2=80=99s normal P=
SP similar to PHP in the mpls world.  So now imagine each P router along the=
 path to the destination PE has a bunch of /127 p2p links.  So now the 1st S=
ID entry would be to the next hop P from the originating PE that inserted th=
e EH routing type 4 header SRH to source route the traffic along the enginee=
red path.  So now if you examine that 1st SID entry it is a 128 bit address w=
ith embedded information such as the function and arguments in the station i=
d so the actual IPv6 FIB entry for the egress PE FEC destination would have a=
 next hop of the P router which is the SID what the 1st SID contains which i=
s a 128 bit address to route to the 1st node which is the next hop PE. Once t=
he packet arrives at the 1st node in the case the ingress P the station id I=
ID is decoded for any functions or argument the need to be executed by the i=
nstruction PSSI.=20
>>=20
>> That=E2=80=99s my interpretation but I have to build this out in the lab d=
o dig deeper into the bits and bytes. =20
>>=20
>> Cheers,
>>=20
>> Gyan
>>=20
>> Sent from my iPhone
>>=20
>>> On Oct 9, 2019, at 8:02 PM, Ron Bonica <rbonica@juniper.net> wrote:
>>>=20
>>> Gyan,
>>>=20
>>> If the Locator were guaranteed to be 64 bits, as you suggest, there woul=
d be no problem. However, the following text from Section 3.1 suggests other=
wise.
>>>=20
>>> "   An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is the L=

>>> most significant bits and FUNCT (function) is the 128-L least =20
>>> significant bits of the SID.  L is called the locator length and is =20
>>> flexible.  Each operator is free to use the locator length it =20
>>> chooses.  Most often the locator is routable and leads to the node =20
>>> which instantiates that SID.  A control-plane protocol might =20
>>> represent the locator as B:N where B is the SRv6 SID block (IPv6 =20
>>> subnet allocated for SRv6 SIDs by the operator) and N is the =20
>>> identifier of the parent node."
>>>=20
>>>                                                                  Ron
>>>=20
>>>=20
>>>=20
>>> Juniper Business Use Only
>>>=20
>>> -----Original Message-----
>>> From: Gyan Mishra <hayabusagsm@gmail.com>
>>> Sent: Wednesday, October 9, 2019 7:21 PM
>>> To: Ron Bonica <rbonica@juniper.net>
>>> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List=20
>>> <spring@ietf.org>
>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
>>> IPv6 Addresses and SIDs
>>>=20
>>>=20
>>>=20
>>> In-line comments
>>>=20
>>> Thanks
>>>=20
>>> Gyan
>>>=20
>>> Sent from my iPhone
>>>=20
>>>> On Oct 3, 2019, at 12:25 PM, Ron Bonica <rbonica=3D40juniper.net@dmarc.=
ietf.org> wrote:
>>>>=20
>>>> Fernando,
>>>>=20
>>>> Someone should. I think that the expertise to do this is in 6man.
>>>>=20
>>>>                               Ron
>>>>=20
>>>>=20
>>>> Juniper Business Use Only
>>>>=20
>>>> -----Original Message-----
>>>> From: Fernando Gont <fgont@si6networks.com>
>>>> Sent: Wednesday, October 2, 2019 3:11 PM
>>>> To: Ron Bonica <rbonica@juniper.net>; SPRING WG List=20
>>>> <spring@ietf.org>
>>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
>>>> IPv6 Addresses and SIDs
>>>>=20
>>>>> On 1/10/19 23:30, Ron Bonica wrote:
>>>>> Authors,
>>>>>=20
>>>>>=20
>>>>>=20
>>>>> The document should include a discussion of the relationship=20
>>>>> between
>>>>> IPv6 addresses and SIDs. For example:
>>>>>=20
>>>>>=20
>>>>>=20
>>>>> * =46rom what address space can SIDs be drawn? Link local? Multicast? U=
LA?
>>>>> * Can a locator be longer than 64 bits? If so, how can the rest of=20
>>>>> the
>>>>> /64 be used?
>>>>=20
>>>> I'm not saying that this shouldn't be done or that it is a bad idea,=20=

>>>> but I'm curious if is anybody looking at this from a higher level?
>>>> (these seems pretty architectural to me)
>>>>=20
>>>> Thanks,
>>>> --
>>>> Fernando Gont
>>>> SI6 Networks
>>>> e-mail: fgont@si6networks.com
>>>> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>>>>=20
>>>>=20
>>>=20
>>> [Gyan] The SRv6 SID format is below:
>>>=20
>>> So from an IPv6 data plane forwarding perspective the fixed length 64 bi=
t Locator is copied hop by hop into the destination address of the IPv6 head=
er to the tail end FEC destination egress PE and during failover Ti-LFA kick=
s in additional EH is inserted {violating RFC 8200} at the PLR NNHOP to the s=
imilar to RLFA PQ node.
>>>=20
>>> So with SRV6 native traffic engineering the locator is either the physic=
al IP on ingress interface along each hop or loopback along each hop and so i=
s either a GUA or ULA but not LL or multicast address is what I understand f=
rom a technical standpoint.
>>>=20
>>> =46rom everything I have read the SID is fixed at 64 bit length maximum b=
ut I guess you can have a smaller then 64 bit locator.
>>>=20
>>> I am working on getting this setup in the lab now so that will really he=
lp understand the real world implementations.
>>>=20
>>> SRv6 SID format:
>>>=20
>>> 128-bits Segment IDs can be used and allocated for different purposes, f=
or example:
>>> =E2=80=A2 The first 64 bits can be used to direct traffic to a specific n=
ode=20
>>> in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D of the program =E2=
=80=A2 The next 32 bits=20
>>> can be used to enforce some actions on the traffic =E2=80=93 the=20
>>> =E2=80=9Cfunction=E2=80=9Dpart =E2=80=A2 The remaining 32 bits can be us=
ed to pass some=20
>>> additional information =E2=80=93 the =E2=80=9Cargument=E2=80=9D part 128=
-bit SRv6 SID
>>> Locator: routed to the node performing the function Function: any=20
>>> possible function Flexible bit-length selection
>>>=20
>>>>=20
>>>> _______________________________________________
>>>> spring mailing list
>>>> spring@ietf.org
>>>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/sp
>>>> r
>>>> i
>>>> ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZGQRTz6hag6LoSzz
>>>> 8
>>>> K
>>>> kBJW9qEVHARw$
>>=20
>> _______________________________________________
>> spring mailing list
>> spring@ietf.org
>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spri
>> ng__;!8WoA6RjC81c!Qg1ex-hXVBJKRryAR1Hl5x2o9By4PbwD0gDjfRxlvNtQ4zGljf0E
>> omr2PHEsckWh$ _______________________________________________
>> spring mailing list
>> spring@ietf.org
>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spri
>> ng__;!8WoA6RjC81c!Qg1ex-hXVBJKRryAR1Hl5x2o9By4PbwD0gDjfRxlvNtQ4zGljf0E
>> omr2PHEsckWh$


From nobody Fri Oct 11 08:12:53 2019
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To: Gyan Mishra <hayabusagsm@gmail.com>
Cc: SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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References: <SN6PR05MB5710CBAF8E6DF307401A2166AE9D0@SN6PR05MB5710.namprd05.prod.outlook.com> <f5eb739b-9ae4-433e-e6c0-8bcdb7bc575e@si6networks.com> <BYAPR05MB5703169601886283700608A5AE9F0@BYAPR05MB5703.namprd05.prod.outlook.com> <B6FE2A8B-B23B-4E9C-BB33-F6A5BD78C52B@gmail.com> <BN7PR05MB5699E5EA714CC64456771712AE940@BN7PR05MB5699.namprd05.prod.outlook.com> <1076F074-EB35-4D38-9949-4A241C946E07@gmail.com> <1fce4e24590847348894d10ca8bd5816@nokia-sbell.com> <D3FE1CA3-A8D1-4392-8EEC-CDCC7FC0827F@gmail.com> <BN7PR05MB56993D1127A8CA9CCC0E4A9AAE970@BN7PR05MB5699.namprd05.prod.outlook.com> <213BB95D-0E06-4E9A-B552-2A2466DC42AF@gmail.com> <04711680-e9c4-1159-58af-609517ee8bdf@joelhalpern.com>
In-Reply-To: <04711680-e9c4-1159-58af-609517ee8bdf@joelhalpern.com>
From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Fri, 11 Oct 2019 12:38:58 -0400
Message-ID: <CABNhwV3SyZNY6GrJF+wpgTmpM6DSts4gXQgdFTEgWfN876u5WQ@mail.gmail.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>
Cc: SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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Sorry I should have read through the draft more carefully as its depicted
clearly in an example in section 3. So the SIDs must be "routable" within
the SRv6 domain per the draft.

https://tools.ietf.org/pdf/draft-ietf-spring-srv6-network-programming-04.pd=
f


So the SID is definitely routable reachable and so must be GUI or ULA and
cannot be a link local as it is rewriting the destination address with this
address to route the packet POP a SID entry hop by hop to source route the
packet to the egress node.  As far as the next hop it is still the
traditional IGP OSPF or ISIS link local address which is programmed into
the SID destination FIB entry as the next hop.  Sorry was confusion on my
part as I confused the next hop being overwritten like next hops in TE ERO
where in this case its the IPv6 data plane and the IPv6 header destination
is being overwritten to the next hop by the SRH SID entry being popped hop
by hop.

! Example
show ip route    2001:DB8:B:1:100: fe80::EUI64

So then I believe my statement is correct that the SID would be just ULA or
GUA and not multicast or link local.

  3. SRv6 SID As introduced in RFC8402 an SRv6 Segment Identifier is a
128-bit value. When an SRv6 SID is in the Destination Address field of an
IPv6 header of a packet, it is routed through an IPv6 network as an IPv6
address. Its processing is defined in
[I-D.ietf-6man-segment-routing-header] section 4.3 and reproduced here as a
reminder. Without constraining the details of an implementation, the SR
segment endpoint node creates Forwarding Information Base (FIB) entries for
its local SIDs. When an SRv6-capable node receives an IPv6 packet, it
performs a longest-prefix-match lookup on the packets destination address. =
This
lookup can return any of the following: - A FIB entry that represents a
locally instantiated SRv6 SID - A FIB entry that represents a local
interface, not locally instantiated as an SRv6 SID - A FIB entry that
represents a non-local route - No Match This document formally defines
behaviors and parameters for SRv6 SIDs.

3.1. SID format An SRv6 SID is represented as LOC:FUNCT where LOC (locator)
is the L most significant bits and FUNCT (function) is the 128-L least
significant bits of the SID. L is called the locator length and is
flexible. Each operator is free to use the locator length it chooses. Most
often the locator is routable and leads to the node which instantiates that
SID. A control-plane protocol might represent the locator as B:N where B is
the SRv6 SID block (IPv6 subnet allocated for SRv6 SIDs by the operator)
and N is the identifier of the parent node. The function part of the SID is
an opaque identification of a local behavior bound to the SID. The FUNCT
value zero is invalid.
  The terminology "function" refers to the bit-string in the SRv6 SID. The
terminology "behavior" identifies the pseudocode bound to the SID. The
behaviors are defined in Section 4 of this document. A behavior may require
additional arguments that would be placed immediately after the FUNCT. In
such case, the SRv6 SID will have the form LOC:FUNCT:ARGS::. For this
reason, the SRv6 SIDs are matched on a per longest-prefix-match basis. ARG
may contain information related to the flow, service, or any other
information required by FUNCT. The ARG value of a routed SID SHOULD remain
constant among packets in a given flow. Varying ARG values among packets in
a flow may result in different ECMP hashing and cause re-ordering.

3.2. SID reachability Most often, the node N would advertise IPv6
prefix(es) matching the LOC parts covering its SIDs or shorter-mask prefix.
The distribution of these advertisements and calculation of their
reachability are routing protocol specific aspects that are outside the
scope of this document. An SRv6 SID is said to be routed if its SID belongs
to an IPv6 prefix advertised via a routing protocol. *An SRv6 SID that does
not fulfill this condition is non-routed.* Let=E2=80=99s provide a classic
illustration: Node N is configured explicitly with two SIDs:
2001:DB8:B:1:100:: and 2001:DB8:B:2:101::. The network learns about a path
to 2001:DB8:B:1::/64 via the IGP and hence a packet destined to
2001:DB8:B:1:100:: would be routed up to N. The network does not learn
about a path to 2001:DB8:B:2::/64 via the IGP and hence a packet destined
to 2001:DB8:B:2:101:: would not be routed up to N. A packet could be
steered to a non-routed SID 2001:DB8:B:2:101:: by using a SID list
<...,2001:DB8:B:1:100::,2001:DB8:B:2:101::,...> where the non-routed SID is
preceded by a routed SID to the same node. Routed and non-routed SRv6 SIDs
are the SRv6 instantiation of global and local segments, respectively
[RFC8402].


On Fri, Oct 11, 2019 at 11:12 AM Joel M. Halpern <jmh@joelhalpern.com>
wrote:

> If we need to see a running implementation to judge what the behavior is
> supposed to be, it sounds like we could use clarifications of the
> specification.
>
> Yours,
> Joel
>
> On 10/11/2019 11:06 AM, Gyan Mishra wrote:
> >
> > Good point.  I think we need someone who has this in the lab or prod to
> see the exact implemented behavior.
> >
> > So since the URIB entry for the FEC destination egress PE prefix has th=
e
> next hop for the IGP used for IPv6 set to the =E2=80=9Clink local next ho=
p would
> the SID entry in the SID list be all link local addresses.
> >
> > So the SRH header SID list the SID entry=E2=80=99s provide the =E2=80=
=9Cnext hop=E2=80=9D to
> source route the traffic to the egress PE. So since normally the IGP next
> hop is a link local would all the SID entries be link local and not GUA o=
r
> ULA.
> >
> > So the destination in the IPv6 packet be traffic engineered would be th=
e
> L3 vpn VRF destination and the FEC to forward to the egress PE that
> terminates ibgp for vpnv4 vpnv6 is the loop /128 on the egress PE but to
> traffic engineer to get their the SID list would have all the next hops
> listed similar to a TE ERO explicit route object static LSP.
> >
> > Gyan
> >
> > Sent from my iPhone
> >
> >> On Oct 11, 2019, at 10:05 AM, Ron Bonica <rbonica@juniper.net> wrote:
> >>
> >> Gyan,
> >>
> >> Why exclude link local for adjacency segments?
> >>
> >>                             Ron
> >>
> >>
> >>
> >> Juniper Business Use Only
> >>
> >> -----Original Message-----
> >> From: Gyan Mishra <hayabusagsm@gmail.com>
> >> Sent: Thursday, October 10, 2019 12:34 PM
> >> To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>
> >> Cc: Ron Bonica <rbonica@juniper.net>; Fernando Gont <
> fgont@si6networks.com>; SPRING WG List <spring@ietf.org>
> >> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv=
6
> Addresses and SIDs
> >>
> >>
> >>
> >> Makes sense.  I think from Ron=E2=80=99s question is types address whi=
ch would
> have to be a GUA or ULA IPv6 URIB FIB routeable 128 bit prefix so that
> would exclude multicast or link local since the prefix has to a unicast
> address and routable and reachable within the domain.
> >>
> >> Ron
> >>
> >> I can take this back to 6MAN WG with regards to SID address types and
> structure should be defined clearly as it is not today.  Agreed.
> >>
> >> Thanks
> >>
> >> Gyan
> >>
> >> Sent from my iPhone
> >>
> >>> On Oct 10, 2019, at 4:44 AM, Wang, Weibin (NSB - CN/Shanghai) <
> weibin.wang@nokia-sbell.com> wrote:
> >>>
> >>> The key character of SRv6 is the SRv6 SID has capability of routable
> function, it is reachable according to FIBv6, so the SIDs, I think, must =
be
> allocated from unicast IPv6 address space, because the SRv6 domain is
> limited and controlled by operator, such as deploying it within it's AS
> domain, so ULA as well GUA, I think, are also options for SRv6 SID; and t=
he
> SID block is separate from plain IPv6 address block which are usually
> configured under Node's interfaces; so they are not overlap each other, b=
ut
> Both of them must advertised by IGP or BGP protocol, they perform differe=
nt
> function within network; how to allocate the SID and how to indicate leng=
th
> of SID prefix May be up to operator and its specific network scenario.
> >>>
> >>> --------------------------------------
> >>> Cheers !
> >>>
> >>>
> >>> WANG Weibin
> >>>
> >>> -----Original Message-----
> >>> From: spring <spring-bounces@ietf.org> On Behalf Of Gyan Mishra
> >>> Sent: 2019=E5=B9=B410=E6=9C=8810=E6=97=A5 10:58
> >>> To: Ron Bonica <rbonica@juniper.net>
> >>> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List
> >>> <spring@ietf.org>
> >>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
> >>> IPv6 Addresses and SIDs
> >>>
> >>>
> >>> Hi Ron,
> >>>
> >>> I read that as well in my SRv6 studies so thinking about it logically
> from an IGP ospf or ISIS longest match routing IPv6 FIB entry perspective
> for me makes sense to understand the SRv6 IPv6 data plane.  So I think my
> interpretation is that the 128 bit SID is broken up into hierarchy fields
> with intelligence but from a routing perspective it=E2=80=99s an IPv6 add=
ress of a
> connected interface on a P or PE router which is a /127 for p2p links
> however it defines your =E2=80=9Cnext hop=E2=80=9D NH or =E2=80=9Cnext ne=
xt hop=E2=80=9D NNH in the legacy
> MPLS TE FRR node or path protection or IP-LFA/Remote LFA or you can think
> of it like a MPLS TE autoroute or FA (forwarding adjacencies) and to use
> that path you have to static next hop to the tunnel but in this SRv6 case
> it=E2=80=99s a next hop IPv6 address which is a full 128 bit address that=
 is in the
> SID entry in the SID list as the next hop for your FEC destination in the
> IPv6 FIB entry.
> >>>
> >>> To make this easier for me to understand the SRv6 spec and how to
> interpret lets think of an example of a service provider core with an IPv=
6
> data plane path between ingress PE and egress and a egress FEC which is t=
he
> loopback0 for your ibgp peering vpn services which is the IPv6 destinatio=
n
> last SID entry in the SID list which the one hop prior P would do it=E2=
=80=99s
> normal PSP similar to PHP in the mpls world.  So now imagine each P route=
r
> along the path to the destination PE has a bunch of /127 p2p links.  So n=
ow
> the 1st SID entry would be to the next hop P from the originating PE that
> inserted the EH routing type 4 header SRH to source route the traffic alo=
ng
> the engineered path.  So now if you examine that 1st SID entry it is a 12=
8
> bit address with embedded information such as the function and arguments =
in
> the station id so the actual IPv6 FIB entry for the egress PE FEC
> destination would have a next hop of the P router which is the SID what t=
he
> 1st SID contains which is a 128 bit address to route to the 1st node whic=
h
> is the next hop PE. Once the packet arrives at the 1st node in the case t=
he
> ingress P the station id IID is decoded for any functions or argument the
> need to be executed by the instruction PSSI.
> >>>
> >>> That=E2=80=99s my interpretation but I have to build this out in the =
lab do
> dig deeper into the bits and bytes.
> >>>
> >>> Cheers,
> >>>
> >>> Gyan
> >>>
> >>> Sent from my iPhone
> >>>
> >>>> On Oct 9, 2019, at 8:02 PM, Ron Bonica <rbonica@juniper.net> wrote:
> >>>>
> >>>> Gyan,
> >>>>
> >>>> If the Locator were guaranteed to be 64 bits, as you suggest, there
> would be no problem. However, the following text from Section 3.1 suggest=
s
> otherwise.
> >>>>
> >>>> "   An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is
> the L
> >>>> most significant bits and FUNCT (function) is the 128-L least
> >>>> significant bits of the SID.  L is called the locator length and is
> >>>> flexible.  Each operator is free to use the locator length it
> >>>> chooses.  Most often the locator is routable and leads to the node
> >>>> which instantiates that SID.  A control-plane protocol might
> >>>> represent the locator as B:N where B is the SRv6 SID block (IPv6
> >>>> subnet allocated for SRv6 SIDs by the operator) and N is the
> >>>> identifier of the parent node."
> >>>>
> >>>>                                                                   Ro=
n
> >>>>
> >>>>
> >>>>
> >>>> Juniper Business Use Only
> >>>>
> >>>> -----Original Message-----
> >>>> From: Gyan Mishra <hayabusagsm@gmail.com>
> >>>> Sent: Wednesday, October 9, 2019 7:21 PM
> >>>> To: Ron Bonica <rbonica@juniper.net>
> >>>> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List
> >>>> <spring@ietf.org>
> >>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
> >>>> IPv6 Addresses and SIDs
> >>>>
> >>>>
> >>>>
> >>>> In-line comments
> >>>>
> >>>> Thanks
> >>>>
> >>>> Gyan
> >>>>
> >>>> Sent from my iPhone
> >>>>
> >>>>> On Oct 3, 2019, at 12:25 PM, Ron Bonica <rbonica=3D
> 40juniper.net@dmarc.ietf.org> wrote:
> >>>>>
> >>>>> Fernando,
> >>>>>
> >>>>> Someone should. I think that the expertise to do this is in 6man.
> >>>>>
> >>>>>                                Ron
> >>>>>
> >>>>>
> >>>>> Juniper Business Use Only
> >>>>>
> >>>>> -----Original Message-----
> >>>>> From: Fernando Gont <fgont@si6networks.com>
> >>>>> Sent: Wednesday, October 2, 2019 3:11 PM
> >>>>> To: Ron Bonica <rbonica@juniper.net>; SPRING WG List
> >>>>> <spring@ietf.org>
> >>>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
> >>>>> IPv6 Addresses and SIDs
> >>>>>
> >>>>>> On 1/10/19 23:30, Ron Bonica wrote:
> >>>>>> Authors,
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> The document should include a discussion of the relationship
> >>>>>> between
> >>>>>> IPv6 addresses and SIDs. For example:
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> * From what address space can SIDs be drawn? Link local? Multicast=
?
> ULA?
> >>>>>> * Can a locator be longer than 64 bits? If so, how can the rest of
> >>>>>> the
> >>>>>> /64 be used?
> >>>>>
> >>>>> I'm not saying that this shouldn't be done or that it is a bad idea=
,
> >>>>> but I'm curious if is anybody looking at this from a higher level?
> >>>>> (these seems pretty architectural to me)
> >>>>>
> >>>>> Thanks,
> >>>>> --
> >>>>> Fernando Gont
> >>>>> SI6 Networks
> >>>>> e-mail: fgont@si6networks.com
> >>>>> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
> >>>>>
> >>>>>
> >>>>
> >>>> [Gyan] The SRv6 SID format is below:
> >>>>
> >>>> So from an IPv6 data plane forwarding perspective the fixed length 6=
4
> bit Locator is copied hop by hop into the destination address of the IPv6
> header to the tail end FEC destination egress PE and during failover Ti-L=
FA
> kicks in additional EH is inserted {violating RFC 8200} at the PLR NNHOP =
to
> the similar to RLFA PQ node.
> >>>>
> >>>> So with SRV6 native traffic engineering the locator is either the
> physical IP on ingress interface along each hop or loopback along each ho=
p
> and so is either a GUA or ULA but not LL or multicast address is what I
> understand from a technical standpoint.
> >>>>
> >>>>  From everything I have read the SID is fixed at 64 bit length
> maximum but I guess you can have a smaller then 64 bit locator.
> >>>>
> >>>> I am working on getting this setup in the lab now so that will reall=
y
> help understand the real world implementations.
> >>>>
> >>>> SRv6 SID format:
> >>>>
> >>>> 128-bits Segment IDs can be used and allocated for different
> purposes, for example:
> >>>> =E2=80=A2 The first 64 bits can be used to direct traffic to a speci=
fic node
> >>>> in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D of the prog=
ram =E2=80=A2 The next 32 bits
> >>>> can be used to enforce some actions on the traffic =E2=80=93 the
> >>>> =E2=80=9Cfunction=E2=80=9Dpart =E2=80=A2 The remaining 32 bits can b=
e used to pass some
> >>>> additional information =E2=80=93 the =E2=80=9Cargument=E2=80=9D part=
 128-bit SRv6 SID
> >>>> Locator: routed to the node performing the function Function: any
> >>>> possible function Flexible bit-length selection
> >>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> spring mailing list
> >>>>> spring@ietf.org
> >>>>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/s=
p
> >>>>> r
> >>>>> i
> >>>>> ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZGQRTz6hag6LoSz=
z
> >>>>> 8
> >>>>> K
> >>>>> kBJW9qEVHARw$
> >>>
> >>> _______________________________________________
> >>> spring mailing list
> >>> spring@ietf.org
> >>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spr=
i
> >>> ng__;!8WoA6RjC81c!Qg1ex-hXVBJKRryAR1Hl5x2o9By4PbwD0gDjfRxlvNtQ4zGljf0=
E
> >>> omr2PHEsckWh$ _______________________________________________
> >>> spring mailing list
> >>> spring@ietf.org
> >>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spr=
i
> >>> ng__;!8WoA6RjC81c!Qg1ex-hXVBJKRryAR1Hl5x2o9By4PbwD0gDjfRxlvNtQ4zGljf0=
E
> >>> omr2PHEsckWh$
> >
> > _______________________________________________
> > spring mailing list
> > spring@ietf.org
> > https://www.ietf.org/mailman/listinfo/spring
> >
>


--=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

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<div dir=3D"ltr"><div><br></div><div>Sorry I should have read through the d=
raft more carefully as its depicted clearly in an example in section 3. So =
the SIDs must be &quot;routable&quot; within the SRv6 domain per the draft.=
=C2=A0</div><div><br></div><div><a href=3D"https://tools.ietf.org/pdf/draft=
-ietf-spring-srv6-network-programming-04.pdf">https://tools.ietf.org/pdf/dr=
aft-ietf-spring-srv6-network-programming-04.pdf</a>=C2=A0</div><div><br></d=
iv><div>So the SID is definitely routable reachable and so must be GUI or U=
LA and cannot be a link local as it is rewriting the destination address wi=
th this address to route the packet POP a SID entry hop by hop to source ro=
ute the packet to the egress node.=C2=A0 As far as the next hop it is still=
 the traditional IGP OSPF or ISIS link local address which is programmed in=
to the SID destination FIB entry as the next hop.=C2=A0 Sorry was confusion=
 on my part as I confused the next hop being overwritten like next hops in =
TE ERO where in this case its the IPv6 data plane and the IPv6 header desti=
nation is being overwritten to the next hop by the SRH SID entry being popp=
ed hop by hop.</div><div><br>! Example</div><div>show ip route=C2=A0 =C2=A0

2001:DB8:B:1:100: fe80::EUI64=C2=A0=C2=A0</div><div><br></div><div>So then =
I believe my statement is correct that the SID would be just ULA or GUA and=
 not multicast or link local.</div><div><br></div><div>=C2=A0 3. SRv6 SID
 As introduced in RFC8402 an SRv6 Segment Identifier is a 128-bit
 value.
 When an SRv6 SID is in the Destination Address field of an IPv6
 header of a packet, it is routed through an IPv6 network as an IPv6
 address.
 Its processing is defined in [I-D.ietf-6man-segment-routing-header]
 section 4.3 and reproduced here as a reminder.
 Without constraining the details of an implementation, the SR
 segment endpoint node creates Forwarding Information Base (FIB)
 entries for its local SIDs.
 <font color=3D"#ff0000">When an SRv6-capable node receives an IPv6 packet,=
 it performs a
 longest-prefix-match lookup on the packets destination address.
</font> This lookup can return any of the following:
 - A FIB entry that represents a locally instantiated SRv6 SID
 - A FIB entry that represents a local interface, not locally
 instantiated as an SRv6 SID
 - <font color=3D"#ff0000">A FIB entry that represents a non-local route
</font> - No Match
 This document formally defines behaviors and parameters for SRv6
 SIDs.=C2=A0</div><div><br></div><div>

3.1. SID format
 An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is the L
 most significant bits and FUNCT (function) is the 128-L least
 significant bits of the SID. L is called the locator length and is
 flexible. <font color=3D"#ff0000">Each operator is free to use the locator=
 length it
 chooses. Most often the locator is routable and leads to the node
 which instantiates that SID. A control-plane protocol might
 represent the locator as B:N where B is the SRv6 SID block (IPv6
 subnet allocated for SRv6 SIDs by the operator) and N is the
 identifier of the parent node.</font>
 The function part of the SID is an opaque identification of a local
 behavior bound to the SID. The FUNCT value zero is invalid.

=C2=A0=C2=A0<br></div><div>=C2=A0 The terminology &quot;function&quot; refe=
rs to the bit-string in the SRv6 SID.
 The terminology &quot;behavior&quot; identifies the pseudocode bound to th=
e
 SID. The behaviors are defined in Section 4 of this document.
 A behavior may require additional arguments that would be placed
 immediately after the FUNCT. In such case, the SRv6 SID will have
 the form LOC:FUNCT:ARGS::. For this reason, the SRv6 SIDs are matched
 on a per longest-prefix-match basis.
 ARG may contain information related to the flow, service, or any
 other information required by FUNCT. The ARG value of a routed SID
 SHOULD remain constant among packets in a given flow. Varying ARG
 values among packets in a flow may result in different ECMP hashing
 and cause re-ordering.=C2=A0</div><div><br></div><div>

3.2. <font color=3D"#ff0000">SID reachability
 Most often, the node N would advertise IPv6 prefix(es) matching the
 LOC parts covering its SIDs or shorter-mask prefix.</font> The distributio=
n
 of these advertisements and calculation of their reachability are
 routing protocol specific aspects that are outside the scope of this
 document.
 <font color=3D"#ff0000">An SRv6 SID is said to be routed if its SID belong=
s to an IPv6 prefix
 advertised via a routing protocol. </font><b><font color=3D"#ff0000">An SR=
v6 SID that does not fulfill
 this condition is non-routed.</font></b>
 Let=E2=80=99s provide a classic illustration:
 Node N is configured explicitly with two SIDs: 2001:DB8:B:1:100:: and
 2001:DB8:B:2:101::.
 The network learns about a path to 2001:DB8:B:1::/64 via the IGP and
 hence a packet destined to 2001:DB8:B:1:100:: would be routed up to
 N. The network does not learn about a path to 2001:DB8:B:2::/64 via
 the IGP and hence a packet destined to 2001:DB8:B:2:101:: would not
 be routed up to N.
 <font color=3D"#ff0000">A packet could be steered to a non-routed SID 2001=
:DB8:B:2:101:: by
 using a SID list &lt;...,2001:DB8:B:1:100::,2001:DB8:B:2:101::,...&gt;
 where the non-routed SID is preceded by a routed SID to the same
 node. Routed and non-routed SRv6 SIDs are the SRv6 instantiation of
 global and local segments, respectively [RFC8402].


=C2=A0=C2=A0</font><br></div><div>=C2=A0<br></div></div><br><div class=3D"g=
mail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Oct 11, 2019 at 1=
1:12 AM Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com">jmh@joel=
halpern.com</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">If we need to see a running implementation to judge what the beh=
avior is <br>
supposed to be, it sounds like we could use clarifications of the <br>
specification.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 10/11/2019 11:06 AM, Gyan Mishra wrote:<br>
&gt; <br>
&gt; Good point.=C2=A0 I think we need someone who has this in the lab or p=
rod to see the exact implemented behavior.<br>
&gt; <br>
&gt; So since the URIB entry for the FEC destination egress PE prefix has t=
he next hop for the IGP used for IPv6 set to the =E2=80=9Clink local next h=
op would the SID entry in the SID list be all link local addresses.<br>
&gt; <br>
&gt; So the SRH header SID list the SID entry=E2=80=99s provide the =E2=80=
=9Cnext hop=E2=80=9D to source route the traffic to the egress PE. So since=
 normally the IGP next hop is a link local would all the SID entries be lin=
k local and not GUA or ULA.<br>
&gt; <br>
&gt; So the destination in the IPv6 packet be traffic engineered would be t=
he L3 vpn VRF destination and the FEC to forward to the egress PE that term=
inates ibgp for vpnv4 vpnv6 is the loop /128 on the egress PE but to traffi=
c engineer to get their the SID list would have all the next hops listed si=
milar to a TE ERO explicit route object static LSP.<br>
&gt; <br>
&gt; Gyan<br>
&gt; <br>
&gt; Sent from my iPhone<br>
&gt; <br>
&gt;&gt; On Oct 11, 2019, at 10:05 AM, Ron Bonica &lt;<a href=3D"mailto:rbo=
nica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt; wrote:<br>
&gt;&gt;<br>
&gt;&gt; Gyan,<br>
&gt;&gt;<br>
&gt;&gt; Why exclude link local for adjacency segments?<br>
&gt;&gt;<br>
&gt;&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=A0Ron<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;<br>
&gt;&gt; -----Original Message-----<br>
&gt;&gt; From: Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.com" tar=
get=3D"_blank">hayabusagsm@gmail.com</a>&gt;<br>
&gt;&gt; Sent: Thursday, October 10, 2019 12:34 PM<br>
&gt;&gt; To: Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.=
wang@nokia-sbell.com" target=3D"_blank">weibin.wang@nokia-sbell.com</a>&gt;=
<br>
&gt;&gt; Cc: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=
=3D"_blank">rbonica@juniper.net</a>&gt;; Fernando Gont &lt;<a href=3D"mailt=
o:fgont@si6networks.com" target=3D"_blank">fgont@si6networks.com</a>&gt;; S=
PRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spri=
ng@ietf.org</a>&gt;<br>
&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -=
 IPv6 Addresses and SIDs<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; Makes sense.=C2=A0 I think from Ron=E2=80=99s question is types ad=
dress which would have to be a GUA or ULA IPv6 URIB FIB routeable 128 bit p=
refix so that would exclude multicast or link local since the prefix has to=
 a unicast address and routable and reachable within the domain.<br>
&gt;&gt;<br>
&gt;&gt; Ron<br>
&gt;&gt;<br>
&gt;&gt; I can take this back to 6MAN WG with regards to SID address types =
and structure should be defined clearly as it is not today.=C2=A0 Agreed.<b=
r>
&gt;&gt;<br>
&gt;&gt; Thanks<br>
&gt;&gt;<br>
&gt;&gt; Gyan<br>
&gt;&gt;<br>
&gt;&gt; Sent from my iPhone<br>
&gt;&gt;<br>
&gt;&gt;&gt; On Oct 10, 2019, at 4:44 AM, Wang, Weibin (NSB - CN/Shanghai) =
&lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com" target=3D"_blank">weibin=
.wang@nokia-sbell.com</a>&gt; wrote:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; The key character of SRv6 is the SRv6 SID has capability of ro=
utable function, it is reachable according to FIBv6, so the SIDs, I think, =
must be allocated from unicast IPv6 address space, because the SRv6 domain =
is limited and controlled by operator, such as deploying it within it&#39;s=
 AS domain, so ULA as well GUA, I think, are also options for SRv6 SID; and=
 the SID block is separate from plain IPv6 address block which are usually =
configured under Node&#39;s interfaces; so they are not overlap each other,=
 but Both of them must advertised by IGP or BGP protocol, they perform diff=
erent function within network; how to allocate the SID and how to indicate =
length of SID prefix May be up to operator and its specific network scenari=
o.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; --------------------------------------<br>
&gt;&gt;&gt; Cheers !<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; WANG Weibin<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt; From: spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" ta=
rget=3D"_blank">spring-bounces@ietf.org</a>&gt; On Behalf Of Gyan Mishra<br=
>
&gt;&gt;&gt; Sent: 2019=E5=B9=B410=E6=9C=8810=E6=97=A5 10:58<br>
&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" targ=
et=3D"_blank">rbonica@juniper.net</a>&gt;<br>
&gt;&gt;&gt; Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com"=
 target=3D"_blank">fgont@si6networks.com</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">sprin=
g@ietf.org</a>&gt;<br>
&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programmi=
ng -<br>
&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Hi Ron,<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; I read that as well in my SRv6 studies so thinking about it lo=
gically from an IGP ospf or ISIS longest match routing IPv6 FIB entry persp=
ective for me makes sense to understand the SRv6 IPv6 data plane.=C2=A0 So =
I think my interpretation is that the 128 bit SID is broken up into hierarc=
hy fields with intelligence but from a routing perspective it=E2=80=99s an =
IPv6 address of a connected interface on a P or PE router which is a /127 f=
or p2p links however it defines your =E2=80=9Cnext hop=E2=80=9D NH or =E2=
=80=9Cnext next hop=E2=80=9D NNH in the legacy MPLS TE FRR node or path pro=
tection or IP-LFA/Remote LFA or you can think of it like a MPLS TE autorout=
e or FA (forwarding adjacencies) and to use that path you have to static ne=
xt hop to the tunnel but in this SRv6 case it=E2=80=99s a next hop IPv6 add=
ress which is a full 128 bit address that is in the SID entry in the SID li=
st as the next hop for your FEC destination in the IPv6 FIB entry.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; To make this easier for me to understand the SRv6 spec and how=
 to interpret lets think of an example of a service provider core with an I=
Pv6 data plane path between ingress PE and egress and a egress FEC which is=
 the loopback0 for your ibgp peering vpn services which is the IPv6 destina=
tion last SID entry in the SID list which the one hop prior P would do it=
=E2=80=99s normal PSP similar to PHP in the mpls world.=C2=A0 So now imagin=
e each P router along the path to the destination PE has a bunch of /127 p2=
p links.=C2=A0 So now the 1st SID entry would be to the next hop P from the=
 originating PE that inserted the EH routing type 4 header SRH to source ro=
ute the traffic along the engineered path.=C2=A0 So now if you examine that=
 1st SID entry it is a 128 bit address with embedded information such as th=
e function and arguments in the station id so the actual IPv6 FIB entry for=
 the egress PE FEC destination would have a next hop of the P router which =
is the SID what the 1st SID contains which is a 128 bit address to route to=
 the 1st node which is the next hop PE. Once the packet arrives at the 1st =
node in the case the ingress P the station id IID is decoded for any functi=
ons or argument the need to be executed by the instruction PSSI.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; That=E2=80=99s my interpretation but I have to build this out =
in the lab do dig deeper into the bits and bytes.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Cheers,<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Gyan<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Sent from my iPhone<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; On Oct 9, 2019, at 8:02 PM, Ron Bonica &lt;<a href=3D"mail=
to:rbonica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt; wrote=
:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Gyan,<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; If the Locator were guaranteed to be 64 bits, as you sugge=
st, there would be no problem. However, the following text from Section 3.1=
 suggests otherwise.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; &quot;=C2=A0 =C2=A0An SRv6 SID is represented as LOC:FUNCT=
 where LOC (locator) is the L<br>
&gt;&gt;&gt;&gt; most significant bits and FUNCT (function) is the 128-L le=
ast<br>
&gt;&gt;&gt;&gt; significant bits of the SID.=C2=A0 L is called the locator=
 length and is<br>
&gt;&gt;&gt;&gt; flexible.=C2=A0 Each operator is free to use the locator l=
ength it<br>
&gt;&gt;&gt;&gt; chooses.=C2=A0 Most often the locator is routable and lead=
s to the node<br>
&gt;&gt;&gt;&gt; which instantiates that SID.=C2=A0 A control-plane protoco=
l might<br>
&gt;&gt;&gt;&gt; represent the locator as B:N where B is the SRv6 SID block=
 (IPv6<br>
&gt;&gt;&gt;&gt; subnet allocated for SRv6 SIDs by the operator) and N is t=
he<br>
&gt;&gt;&gt;&gt; identifier of the parent node.&quot;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&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=A0Ron<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt;&gt; From: Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.=
com" target=3D"_blank">hayabusagsm@gmail.com</a>&gt;<br>
&gt;&gt;&gt;&gt; Sent: Wednesday, October 9, 2019 7:21 PM<br>
&gt;&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" =
target=3D"_blank">rbonica@juniper.net</a>&gt;<br>
&gt;&gt;&gt;&gt; Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.=
com" target=3D"_blank">fgont@si6networks.com</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">s=
pring@ietf.org</a>&gt;<br>
&gt;&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-progr=
amming -<br>
&gt;&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; In-line comments<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Thanks<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Gyan<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Sent from my iPhone<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; On Oct 3, 2019, at 12:25 PM, Ron Bonica &lt;rbonica=3D=
<a href=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40juniper=
.net@dmarc.ietf.org</a>&gt; wrote:<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Fernando,<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Someone should. I think that the expertise to do this =
is in 6man.<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&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 Ron<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt;&gt;&gt; From: Fernando Gont &lt;<a href=3D"mailto:fgont@si6net=
works.com" target=3D"_blank">fgont@si6networks.com</a>&gt;<br>
&gt;&gt;&gt;&gt;&gt; Sent: Wednesday, October 2, 2019 3:11 PM<br>
&gt;&gt;&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.n=
et" target=3D"_blank">rbonica@juniper.net</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blan=
k">spring@ietf.org</a>&gt;<br>
&gt;&gt;&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-p=
rogramming -<br>
&gt;&gt;&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; On 1/10/19 23:30, Ron Bonica wrote:<br>
&gt;&gt;&gt;&gt;&gt;&gt; Authors,<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; The document should include a discussion of the re=
lationship<br>
&gt;&gt;&gt;&gt;&gt;&gt; between<br>
&gt;&gt;&gt;&gt;&gt;&gt; IPv6 addresses and SIDs. For example:<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; * From what address space can SIDs be drawn? Link =
local? Multicast? ULA?<br>
&gt;&gt;&gt;&gt;&gt;&gt; * Can a locator be longer than 64 bits? If so, how=
 can the rest of<br>
&gt;&gt;&gt;&gt;&gt;&gt; the<br>
&gt;&gt;&gt;&gt;&gt;&gt; /64 be used?<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; I&#39;m not saying that this shouldn&#39;t be done or =
that it is a bad idea,<br>
&gt;&gt;&gt;&gt;&gt; but I&#39;m curious if is anybody looking at this from=
 a higher level?<br>
&gt;&gt;&gt;&gt;&gt; (these seems pretty architectural to me)<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Thanks,<br>
&gt;&gt;&gt;&gt;&gt; --<br>
&gt;&gt;&gt;&gt;&gt; Fernando Gont<br>
&gt;&gt;&gt;&gt;&gt; SI6 Networks<br>
&gt;&gt;&gt;&gt;&gt; e-mail: <a href=3D"mailto:fgont@si6networks.com" targe=
t=3D"_blank">fgont@si6networks.com</a><br>
&gt;&gt;&gt;&gt;&gt; PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D=
55 1D4E 7492<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; [Gyan] The SRv6 SID format is below:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; So from an IPv6 data plane forwarding perspective the fixe=
d length 64 bit Locator is copied hop by hop into the destination address o=
f the IPv6 header to the tail end FEC destination egress PE and during fail=
over Ti-LFA kicks in additional EH is inserted {violating RFC 8200} at the =
PLR NNHOP to the similar to RLFA PQ node.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; So with SRV6 native traffic engineering the locator is eit=
her the physical IP on ingress interface along each hop or loopback along e=
ach hop and so is either a GUA or ULA but not LL or multicast address is wh=
at I understand from a technical standpoint.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;=C2=A0 From everything I have read the SID is fixed at 64 b=
it length maximum but I guess you can have a smaller then 64 bit locator.<b=
r>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; I am working on getting this setup in the lab now so that =
will really help understand the real world implementations.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; SRv6 SID format:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; 128-bits Segment IDs can be used and allocated for differe=
nt purposes, for example:<br>
&gt;&gt;&gt;&gt; =E2=80=A2 The first 64 bits can be used to direct traffic =
to a specific node<br>
&gt;&gt;&gt;&gt; in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D o=
f the program =E2=80=A2 The next 32 bits<br>
&gt;&gt;&gt;&gt; can be used to enforce some actions on the traffic =E2=80=
=93 the<br>
&gt;&gt;&gt;&gt; =E2=80=9Cfunction=E2=80=9Dpart =E2=80=A2 The remaining 32 =
bits can be used to pass some<br>
&gt;&gt;&gt;&gt; additional information =E2=80=93 the =E2=80=9Cargument=E2=
=80=9D part 128-bit SRv6 SID<br>
&gt;&gt;&gt;&gt; Locator: routed to the node performing the function Functi=
on: any<br>
&gt;&gt;&gt;&gt; possible function Flexible bit-length selection<br>
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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Fri, 11 Oct 2019 12:52:29 -0400
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To: "Joel M. Halpern" <jmh@joelhalpern.com>, Ron Bonica <rbonica@juniper.net>
Cc: SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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in-line comment

On Fri, Oct 11, 2019 at 12:38 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:

>
> Sorry I should have read through the draft more carefully as its depicted
> clearly in an example in section 3. So the SIDs must be "routable" within
> the SRv6 domain per the draft.
>
>
> https://tools.ietf.org/pdf/draft-ietf-spring-srv6-network-programming-04.=
pdf
>
>
> So the SID is definitely routable reachable and so must be GUI or ULA and
> cannot be a link local as it is rewriting the destination address with th=
is
> address to route the packet POP a SID entry hop by hop to source route th=
e
> packet to the egress node.  As far as the next hop it is still the
> traditional IGP OSPF or ISIS link local address which is programmed into
> the SID destination FIB entry as the next hop.  Sorry was confusion on my
> part as I confused the next hop being overwritten like next hops in TE ER=
O
> where in this case its the IPv6 data plane and the IPv6 header destinatio=
n
> is being overwritten to the next hop by the SRH SID entry being popped ho=
p
> by hop.
>
> ! Example
> show ip route    2001:DB8:B:1:100: fe80::EUI64
>
> So then I believe my statement is correct that the SID would be just ULA
> or GUA and not multicast or link local.
>
>   3. SRv6 SID As introduced in RFC8402 an SRv6 Segment Identifier is a
> 128-bit value. When an SRv6 SID is in the Destination Address field of an
> IPv6 header of a packet, it is routed through an IPv6 network as an IPv6
> address. Its processing is defined in
> [I-D.ietf-6man-segment-routing-header] section 4.3 and reproduced here as=
 a
> reminder. Without constraining the details of an implementation, the SR
> segment endpoint node creates Forwarding Information Base (FIB) entries f=
or
> its local SIDs. When an SRv6-capable node receives an IPv6 packet, it
> performs a longest-prefix-match lookup on the packets destination address=
. This
> lookup can return any of the following: - A FIB entry that represents a
> locally instantiated SRv6 SID - A FIB entry that represents a local
> interface, not locally instantiated as an SRv6 SID - A FIB entry that
> represents a non-local route - No Match This document formally defines
> behaviors and parameters for SRv6 SIDs.
>
> 3.1. SID format An SRv6 SID is represented as LOC:FUNCT where LOC
> (locator) is the L most significant bits and FUNCT (function) is the 128-=
L
> least significant bits of the SID. L is called the locator length and is
> flexible. *Each operator is free to use the locator length it chooses.*
> Most often the locator is routable and leads to the node which instantiat=
es
> that SID. A control-plane protocol might represent the locator as B:N whe=
re
> B is the SRv6 SID block (IPv6 subnet allocated for SRv6 SIDs by the
> operator) and N is the identifier of the parent node. The function part
> of the SID is an opaque identification of a local behavior bound to the
> SID. The FUNCT value zero is invalid.
>   The terminology "function" refers to the bit-string in the SRv6 SID. Th=
e
> terminology "behavior" identifies the pseudocode bound to the SID. The
> behaviors are defined in Section 4 of this document. A behavior may requi=
re
> additional arguments that would be placed immediately after the FUNCT. In
> such case, the SRv6 SID will have the form LOC:FUNCT:ARGS::. For this
> reason, the SRv6 SIDs are matched on a per longest-prefix-match basis. AR=
G
> may contain information related to the flow, service, or any other
> information required by FUNCT. The ARG value of a routed SID SHOULD remai=
n
> constant among packets in a given flow. Varying ARG values among packets =
in
> a flow may result in different ECMP hashing and cause re-ordering.
>
> 3.2. SID reachability Most often, the node N would advertise IPv6
> prefix(es) matching the LOC parts covering its SIDs or shorter-mask prefi=
x.
> The distribution of these advertisements and calculation of their
> reachability are routing protocol specific aspects that are outside the
> scope of this document. An SRv6 SID is said to be routed if its SID
> belongs to an IPv6 prefix advertised via a routing protocol. *An SRv6 SID
> that does not fulfill this condition is non-routed.* Let=E2=80=99s provid=
e a
> classic illustration: Node N is configured explicitly with two SIDs:
> 2001:DB8:B:1:100:: and 2001:DB8:B:2:101::. The network learns about a pat=
h
> to 2001:DB8:B:1::/64 via the IGP and hence a packet destined to
> 2001:DB8:B:1:100:: would be routed up to N. The network does not learn
> about a path to 2001:DB8:B:2::/64 via the IGP and hence a packet destined
> to 2001:DB8:B:2:101:: would not be routed up to N. A packet could be
> steered to a non-routed SID 2001:DB8:B:2:101:: by using a SID list
> <...,2001:DB8:B:1:100::,2001:DB8:B:2:101::,...> where the non-routed SID =
is
> preceded by a routed SID to the same node. Routed and non-routed SRv6 SID=
s
> are the SRv6 instantiation of global and local segments, respectively
> [RFC8402].
>
>
    [Gyan]  In section 3.1  I bolded " Each operator is free to use the
locator length it chooses." So I guess the locator field is 64 bits but I
guess you could have a shorter locator field.
    So I guess what it sounds like  how this would work is imagine a SP
core with many P routers hops along a path to an egress PE node and each P
has tons of /127s links meshed through the P core.

    I am trying to envision how the addressing plan would work for SRv6 SP
core.

   So each P node in the core would have a /64 allocated to it which is in
essence a "summary route"  that contains all the contiguous /127s that
reside on that P node and has a Loopback or virtual interface that has this
/64 that is routable kind of like a BGP summary route and that is
advertised into the IGP by every P router and every P router has this
special /64 for SRv6 routing that is used for the SRH SID list to build any
to any SRv6 TE paths.

So once you route hop by hop to that SID locator which is the /64 then as
you land on each node you can do the PSSI and process the function/argument
or what ever tasks need to be done hop by hop along the path to the egress
PE FEC destination.

So now any ingress PE SRH would have in its RIB/FIB all the /64s for all
the loops that represent each P node in the core to build the SID list for
the traffic engineered path.

So now this /64 Locator is what the draft is stating can be any length
meaning shorter then /64 for either GUI or ULA implementations.



Gyan



> On Fri, Oct 11, 2019 at 11:12 AM Joel M. Halpern <jmh@joelhalpern.com>
> wrote:
>
>> If we need to see a running implementation to judge what the behavior is
>> supposed to be, it sounds like we could use clarifications of the
>> specification.
>>
>> Yours,
>> Joel
>>
>> On 10/11/2019 11:06 AM, Gyan Mishra wrote:
>> >
>> > Good point.  I think we need someone who has this in the lab or prod t=
o
>> see the exact implemented behavior.
>> >
>> > So since the URIB entry for the FEC destination egress PE prefix has
>> the next hop for the IGP used for IPv6 set to the =E2=80=9Clink local ne=
xt hop
>> would the SID entry in the SID list be all link local addresses.
>> >
>> > So the SRH header SID list the SID entry=E2=80=99s provide the =E2=80=
=9Cnext hop=E2=80=9D to
>> source route the traffic to the egress PE. So since normally the IGP nex=
t
>> hop is a link local would all the SID entries be link local and not GUA =
or
>> ULA.
>> >
>> > So the destination in the IPv6 packet be traffic engineered would be
>> the L3 vpn VRF destination and the FEC to forward to the egress PE that
>> terminates ibgp for vpnv4 vpnv6 is the loop /128 on the egress PE but to
>> traffic engineer to get their the SID list would have all the next hops
>> listed similar to a TE ERO explicit route object static LSP.
>> >
>> > Gyan
>> >
>> > Sent from my iPhone
>> >
>> >> On Oct 11, 2019, at 10:05 AM, Ron Bonica <rbonica@juniper.net> wrote:
>> >>
>> >> Gyan,
>> >>
>> >> Why exclude link local for adjacency segments?
>> >>
>> >>                             Ron
>> >>
>> >>
>> >>
>> >> Juniper Business Use Only
>> >>
>> >> -----Original Message-----
>> >> From: Gyan Mishra <hayabusagsm@gmail.com>
>> >> Sent: Thursday, October 10, 2019 12:34 PM
>> >> To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>
>> >> Cc: Ron Bonica <rbonica@juniper.net>; Fernando Gont <
>> fgont@si6networks.com>; SPRING WG List <spring@ietf.org>
>> >> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
>> IPv6 Addresses and SIDs
>> >>
>> >>
>> >>
>> >> Makes sense.  I think from Ron=E2=80=99s question is types address wh=
ich would
>> have to be a GUA or ULA IPv6 URIB FIB routeable 128 bit prefix so that
>> would exclude multicast or link local since the prefix has to a unicast
>> address and routable and reachable within the domain.
>> >>
>> >> Ron
>> >>
>> >> I can take this back to 6MAN WG with regards to SID address types and
>> structure should be defined clearly as it is not today.  Agreed.
>> >>
>> >> Thanks
>> >>
>> >> Gyan
>> >>
>> >> Sent from my iPhone
>> >>
>> >>> On Oct 10, 2019, at 4:44 AM, Wang, Weibin (NSB - CN/Shanghai) <
>> weibin.wang@nokia-sbell.com> wrote:
>> >>>
>> >>> The key character of SRv6 is the SRv6 SID has capability of routable
>> function, it is reachable according to FIBv6, so the SIDs, I think, must=
 be
>> allocated from unicast IPv6 address space, because the SRv6 domain is
>> limited and controlled by operator, such as deploying it within it's AS
>> domain, so ULA as well GUA, I think, are also options for SRv6 SID; and =
the
>> SID block is separate from plain IPv6 address block which are usually
>> configured under Node's interfaces; so they are not overlap each other, =
but
>> Both of them must advertised by IGP or BGP protocol, they perform differ=
ent
>> function within network; how to allocate the SID and how to indicate len=
gth
>> of SID prefix May be up to operator and its specific network scenario.
>> >>>
>> >>> --------------------------------------
>> >>> Cheers !
>> >>>
>> >>>
>> >>> WANG Weibin
>> >>>
>> >>> -----Original Message-----
>> >>> From: spring <spring-bounces@ietf.org> On Behalf Of Gyan Mishra
>> >>> Sent: 2019=E5=B9=B410=E6=9C=8810=E6=97=A5 10:58
>> >>> To: Ron Bonica <rbonica@juniper.net>
>> >>> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List
>> >>> <spring@ietf.org>
>> >>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
>> >>> IPv6 Addresses and SIDs
>> >>>
>> >>>
>> >>> Hi Ron,
>> >>>
>> >>> I read that as well in my SRv6 studies so thinking about it logicall=
y
>> from an IGP ospf or ISIS longest match routing IPv6 FIB entry perspectiv=
e
>> for me makes sense to understand the SRv6 IPv6 data plane.  So I think m=
y
>> interpretation is that the 128 bit SID is broken up into hierarchy field=
s
>> with intelligence but from a routing perspective it=E2=80=99s an IPv6 ad=
dress of a
>> connected interface on a P or PE router which is a /127 for p2p links
>> however it defines your =E2=80=9Cnext hop=E2=80=9D NH or =E2=80=9Cnext n=
ext hop=E2=80=9D NNH in the legacy
>> MPLS TE FRR node or path protection or IP-LFA/Remote LFA or you can thin=
k
>> of it like a MPLS TE autoroute or FA (forwarding adjacencies) and to use
>> that path you have to static next hop to the tunnel but in this SRv6 cas=
e
>> it=E2=80=99s a next hop IPv6 address which is a full 128 bit address tha=
t is in the
>> SID entry in the SID list as the next hop for your FEC destination in th=
e
>> IPv6 FIB entry.
>> >>>
>> >>> To make this easier for me to understand the SRv6 spec and how to
>> interpret lets think of an example of a service provider core with an IP=
v6
>> data plane path between ingress PE and egress and a egress FEC which is =
the
>> loopback0 for your ibgp peering vpn services which is the IPv6 destinati=
on
>> last SID entry in the SID list which the one hop prior P would do it=E2=
=80=99s
>> normal PSP similar to PHP in the mpls world.  So now imagine each P rout=
er
>> along the path to the destination PE has a bunch of /127 p2p links.  So =
now
>> the 1st SID entry would be to the next hop P from the originating PE tha=
t
>> inserted the EH routing type 4 header SRH to source route the traffic al=
ong
>> the engineered path.  So now if you examine that 1st SID entry it is a 1=
28
>> bit address with embedded information such as the function and arguments=
 in
>> the station id so the actual IPv6 FIB entry for the egress PE FEC
>> destination would have a next hop of the P router which is the SID what =
the
>> 1st SID contains which is a 128 bit address to route to the 1st node whi=
ch
>> is the next hop PE. Once the packet arrives at the 1st node in the case =
the
>> ingress P the station id IID is decoded for any functions or argument th=
e
>> need to be executed by the instruction PSSI.
>> >>>
>> >>> That=E2=80=99s my interpretation but I have to build this out in the=
 lab do
>> dig deeper into the bits and bytes.
>> >>>
>> >>> Cheers,
>> >>>
>> >>> Gyan
>> >>>
>> >>> Sent from my iPhone
>> >>>
>> >>>> On Oct 9, 2019, at 8:02 PM, Ron Bonica <rbonica@juniper.net> wrote:
>> >>>>
>> >>>> Gyan,
>> >>>>
>> >>>> If the Locator were guaranteed to be 64 bits, as you suggest, there
>> would be no problem. However, the following text from Section 3.1 sugges=
ts
>> otherwise.
>> >>>>
>> >>>> "   An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is
>> the L
>> >>>> most significant bits and FUNCT (function) is the 128-L least
>> >>>> significant bits of the SID.  L is called the locator length and is
>> >>>> flexible.  Each operator is free to use the locator length it
>> >>>> chooses.  Most often the locator is routable and leads to the node
>> >>>> which instantiates that SID.  A control-plane protocol might
>> >>>> represent the locator as B:N where B is the SRv6 SID block (IPv6
>> >>>> subnet allocated for SRv6 SIDs by the operator) and N is the
>> >>>> identifier of the parent node."
>> >>>>
>> >>>>                                                                   R=
on
>> >>>>
>> >>>>
>> >>>>
>> >>>> Juniper Business Use Only
>> >>>>
>> >>>> -----Original Message-----
>> >>>> From: Gyan Mishra <hayabusagsm@gmail.com>
>> >>>> Sent: Wednesday, October 9, 2019 7:21 PM
>> >>>> To: Ron Bonica <rbonica@juniper.net>
>> >>>> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List
>> >>>> <spring@ietf.org>
>> >>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
>> >>>> IPv6 Addresses and SIDs
>> >>>>
>> >>>>
>> >>>>
>> >>>> In-line comments
>> >>>>
>> >>>> Thanks
>> >>>>
>> >>>> Gyan
>> >>>>
>> >>>> Sent from my iPhone
>> >>>>
>> >>>>> On Oct 3, 2019, at 12:25 PM, Ron Bonica <rbonica=3D
>> 40juniper.net@dmarc.ietf.org> wrote:
>> >>>>>
>> >>>>> Fernando,
>> >>>>>
>> >>>>> Someone should. I think that the expertise to do this is in 6man.
>> >>>>>
>> >>>>>                                Ron
>> >>>>>
>> >>>>>
>> >>>>> Juniper Business Use Only
>> >>>>>
>> >>>>> -----Original Message-----
>> >>>>> From: Fernando Gont <fgont@si6networks.com>
>> >>>>> Sent: Wednesday, October 2, 2019 3:11 PM
>> >>>>> To: Ron Bonica <rbonica@juniper.net>; SPRING WG List
>> >>>>> <spring@ietf.org>
>> >>>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
>> >>>>> IPv6 Addresses and SIDs
>> >>>>>
>> >>>>>> On 1/10/19 23:30, Ron Bonica wrote:
>> >>>>>> Authors,
>> >>>>>>
>> >>>>>>
>> >>>>>>
>> >>>>>> The document should include a discussion of the relationship
>> >>>>>> between
>> >>>>>> IPv6 addresses and SIDs. For example:
>> >>>>>>
>> >>>>>>
>> >>>>>>
>> >>>>>> * From what address space can SIDs be drawn? Link local?
>> Multicast? ULA?
>> >>>>>> * Can a locator be longer than 64 bits? If so, how can the rest o=
f
>> >>>>>> the
>> >>>>>> /64 be used?
>> >>>>>
>> >>>>> I'm not saying that this shouldn't be done or that it is a bad ide=
a,
>> >>>>> but I'm curious if is anybody looking at this from a higher level?
>> >>>>> (these seems pretty architectural to me)
>> >>>>>
>> >>>>> Thanks,
>> >>>>> --
>> >>>>> Fernando Gont
>> >>>>> SI6 Networks
>> >>>>> e-mail: fgont@si6networks.com
>> >>>>> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>> >>>>>
>> >>>>>
>> >>>>
>> >>>> [Gyan] The SRv6 SID format is below:
>> >>>>
>> >>>> So from an IPv6 data plane forwarding perspective the fixed length
>> 64 bit Locator is copied hop by hop into the destination address of the
>> IPv6 header to the tail end FEC destination egress PE and during failove=
r
>> Ti-LFA kicks in additional EH is inserted {violating RFC 8200} at the PL=
R
>> NNHOP to the similar to RLFA PQ node.
>> >>>>
>> >>>> So with SRV6 native traffic engineering the locator is either the
>> physical IP on ingress interface along each hop or loopback along each h=
op
>> and so is either a GUA or ULA but not LL or multicast address is what I
>> understand from a technical standpoint.
>> >>>>
>> >>>>  From everything I have read the SID is fixed at 64 bit length
>> maximum but I guess you can have a smaller then 64 bit locator.
>> >>>>
>> >>>> I am working on getting this setup in the lab now so that will
>> really help understand the real world implementations.
>> >>>>
>> >>>> SRv6 SID format:
>> >>>>
>> >>>> 128-bits Segment IDs can be used and allocated for different
>> purposes, for example:
>> >>>> =E2=80=A2 The first 64 bits can be used to direct traffic to a spec=
ific node
>> >>>> in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D of the pro=
gram =E2=80=A2 The next 32 bits
>> >>>> can be used to enforce some actions on the traffic =E2=80=93 the
>> >>>> =E2=80=9Cfunction=E2=80=9Dpart =E2=80=A2 The remaining 32 bits can =
be used to pass some
>> >>>> additional information =E2=80=93 the =E2=80=9Cargument=E2=80=9D par=
t 128-bit SRv6 SID
>> >>>> Locator: routed to the node performing the function Function: any
>> >>>> possible function Flexible bit-length selection
>> >>>>
>> >>>>>
>> >>>>> _______________________________________________
>> >>>>> spring mailing list
>> >>>>> spring@ietf.org
>> >>>>>
>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/sp
>> >>>>> r
>> >>>>> i
>> >>>>> ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZGQRTz6hag6LoS=
zz
>> >>>>> 8
>> >>>>> K
>> >>>>> kBJW9qEVHARw$
>> >>>
>> >>> _______________________________________________
>> >>> spring mailing list
>> >>> spring@ietf.org
>> >>>
>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spri
>> >>> ng__;!8WoA6RjC81c!Qg1ex-hXVBJKRryAR1Hl5x2o9By4PbwD0gDjfRxlvNtQ4zGljf=
0E
>> >>> omr2PHEsckWh$ _______________________________________________
>> >>> spring mailing list
>> >>> spring@ietf.org
>> >>>
>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spri
>> >>> ng__;!8WoA6RjC81c!Qg1ex-hXVBJKRryAR1Hl5x2o9By4PbwD0gDjfRxlvNtQ4zGljf=
0E
>> >>> omr2PHEsckWh$
>> >
>> > _______________________________________________
>> > spring mailing list
>> > spring@ietf.org
>> > https://www.ietf.org/mailman/listinfo/spring
>> >
>>
>
>
> --
>
> 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
>
>

--=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

--000000000000f890e20594a55812
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><br></div><div>in-line comment</div><br><=
div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Oct=
 11, 2019 at 12:38 PM Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.c=
om">hayabusagsm@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,20=
4,204);padding-left:1ex"><div dir=3D"ltr"><div><br></div><div>Sorry I shoul=
d have read through the draft more carefully as its depicted clearly in an =
example in section 3. So the SIDs must be &quot;routable&quot; within the S=
Rv6 domain per the draft.=C2=A0</div><div><br></div><div><a href=3D"https:/=
/tools.ietf.org/pdf/draft-ietf-spring-srv6-network-programming-04.pdf" targ=
et=3D"_blank">https://tools.ietf.org/pdf/draft-ietf-spring-srv6-network-pro=
gramming-04.pdf</a>=C2=A0</div><div><br></div><div>So the SID is definitely=
 routable reachable and so must be GUI or ULA and cannot be a link local as=
 it is rewriting the destination address with this address to route the pac=
ket POP a SID entry hop by hop to source route the packet to the egress nod=
e.=C2=A0 As far as the next hop it is still the traditional IGP OSPF or ISI=
S link local address which is programmed into the SID destination FIB entry=
 as the next hop.=C2=A0 Sorry was confusion on my part as I confused the ne=
xt hop being overwritten like next hops in TE ERO where in this case its th=
e IPv6 data plane and the IPv6 header destination is being overwritten to t=
he next hop by the SRH SID entry being popped hop by hop.</div><div><br>! E=
xample</div><div>show ip route=C2=A0 =C2=A0

2001:DB8:B:1:100: fe80::EUI64=C2=A0=C2=A0</div><div><br></div><div>So then =
I believe my statement is correct that the SID would be just ULA or GUA and=
 not multicast or link local.</div><div><br></div><div>=C2=A0 3. SRv6 SID
 As introduced in RFC8402 an SRv6 Segment Identifier is a 128-bit
 value.
 When an SRv6 SID is in the Destination Address field of an IPv6
 header of a packet, it is routed through an IPv6 network as an IPv6
 address.
 Its processing is defined in [I-D.ietf-6man-segment-routing-header]
 section 4.3 and reproduced here as a reminder.
 Without constraining the details of an implementation, the SR
 segment endpoint node creates Forwarding Information Base (FIB)
 entries for its local SIDs.
 <font color=3D"#ff0000">When an SRv6-capable node receives an IPv6 packet,=
 it performs a
 longest-prefix-match lookup on the packets destination address.
</font> This lookup can return any of the following:
 - A FIB entry that represents a locally instantiated SRv6 SID
 - A FIB entry that represents a local interface, not locally
 instantiated as an SRv6 SID
 - <font color=3D"#ff0000">A FIB entry that represents a non-local route
</font> - No Match
 This document formally defines behaviors and parameters for SRv6
 SIDs.=C2=A0</div><div><br></div><div>

3.1. SID format
 An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is the L
 most significant bits and FUNCT (function) is the 128-L least
 significant bits of the SID. L is called the locator length and is
 flexible. <font color=3D"#ff0000"><b>Each operator is free to use the loca=
tor length it
 chooses.</b> Most often the locator is routable and leads to the node
 which instantiates that SID. A control-plane protocol might
 represent the locator as B:N where B is the SRv6 SID block (IPv6
 subnet allocated for SRv6 SIDs by the operator) and N is the
 identifier of the parent node.</font>
 The function part of the SID is an opaque identification of a local
 behavior bound to the SID. The FUNCT value zero is invalid.

=C2=A0=C2=A0<br></div><div>=C2=A0 The terminology &quot;function&quot; refe=
rs to the bit-string in the SRv6 SID.
 The terminology &quot;behavior&quot; identifies the pseudocode bound to th=
e
 SID. The behaviors are defined in Section 4 of this document.
 A behavior may require additional arguments that would be placed
 immediately after the FUNCT. In such case, the SRv6 SID will have
 the form LOC:FUNCT:ARGS::. For this reason, the SRv6 SIDs are matched
 on a per longest-prefix-match basis.
 ARG may contain information related to the flow, service, or any
 other information required by FUNCT. The ARG value of a routed SID
 SHOULD remain constant among packets in a given flow. Varying ARG
 values among packets in a flow may result in different ECMP hashing
 and cause re-ordering.=C2=A0</div><div><br></div><div>

3.2. <font color=3D"#ff0000">SID reachability
 Most often, the node N would advertise IPv6 prefix(es) matching the
 LOC parts covering its SIDs or shorter-mask prefix.</font> The distributio=
n
 of these advertisements and calculation of their reachability are
 routing protocol specific aspects that are outside the scope of this
 document.
 <font color=3D"#ff0000">An SRv6 SID is said to be routed if its SID belong=
s to an IPv6 prefix
 advertised via a routing protocol. </font><b><font color=3D"#ff0000">An SR=
v6 SID that does not fulfill
 this condition is non-routed.</font></b>
 Let=E2=80=99s provide a classic illustration:
 Node N is configured explicitly with two SIDs: 2001:DB8:B:1:100:: and
 2001:DB8:B:2:101::.
 The network learns about a path to 2001:DB8:B:1::/64 via the IGP and
 hence a packet destined to 2001:DB8:B:1:100:: would be routed up to
 N. The network does not learn about a path to 2001:DB8:B:2::/64 via
 the IGP and hence a packet destined to 2001:DB8:B:2:101:: would not
 be routed up to N.
 <font color=3D"#ff0000">A packet could be steered to a non-routed SID 2001=
:DB8:B:2:101:: by
 using a SID list &lt;...,2001:DB8:B:1:100::,2001:DB8:B:2:101::,...&gt;
 where the non-routed SID is preceded by a routed SID to the same
 node. Routed and non-routed SRv6 SIDs are the SRv6 instantiation of
 global and local segments, respectively [RFC8402].


=C2=A0=C2=A0</font><br></div><div>=C2=A0<br></div></div></blockquote><div>=
=C2=A0 =C2=A0 [Gyan]=C2=A0 In section 3.1=C2=A0 I bolded &quot;

Each operator is free to use the locator length it
 chooses.&quot; So I guess the locator field is 64 bits but I guess you cou=
ld have a shorter locator field.</div><div>=C2=A0 =C2=A0 So I guess what it=
 sounds like=C2=A0 how this would work is imagine a SP core with many P rou=
ters hops along a path to an egress PE node and each P has tons of /127s li=
nks meshed through the P core.=C2=A0</div><div><br></div><div>=C2=A0 =C2=A0=
 I am trying to envision how the addressing plan would work for SRv6 SP cor=
e.</div><div><br></div><div>=C2=A0 =C2=A0So each P node in the core would h=
ave a /64 allocated to it which is in essence a &quot;summary route&quot;=
=C2=A0 that contains all the contiguous /127s that reside on that P node an=
d has a Loopback or virtual interface that has this /64 that is routable ki=
nd of like a BGP summary route and that is advertised into the IGP by every=
 P router and every P router has this special /64 for SRv6 routing that is =
used for the SRH SID list to build any to any SRv6 TE paths.</div><div><br>=
</div><div>So once you route hop by hop to that SID locator which is the /6=
4 then as you land on each node you can do the PSSI and process the functio=
n/argument or what ever tasks need to be done hop by hop along the path to =
the egress PE FEC destination.</div><div><br></div><div>So now any ingress =
PE SRH would have in its RIB/FIB all the /64s for all the loops that repres=
ent each P node in the core to build the SID list for the traffic engineere=
d path.=C2=A0=C2=A0</div><div><br></div><div>So now this /64 Locator is wha=
t the draft is stating can be any length meaning shorter then /64 for eithe=
r GUI or ULA implementations.=C2=A0</div><div><br></div><div><br></div><div=
><br></div><div>Gyan</div><div><br></div><div><br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div></div></div><br><div=
 class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Oct 11=
, 2019 at 11:12 AM Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.co=
m" target=3D"_blank">jmh@joelhalpern.com</a>&gt; wrote:<br></div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px s=
olid rgb(204,204,204);padding-left:1ex">If we need to see a running impleme=
ntation to judge what the behavior is <br>
supposed to be, it sounds like we could use clarifications of the <br>
specification.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 10/11/2019 11:06 AM, Gyan Mishra wrote:<br>
&gt; <br>
&gt; Good point.=C2=A0 I think we need someone who has this in the lab or p=
rod to see the exact implemented behavior.<br>
&gt; <br>
&gt; So since the URIB entry for the FEC destination egress PE prefix has t=
he next hop for the IGP used for IPv6 set to the =E2=80=9Clink local next h=
op would the SID entry in the SID list be all link local addresses.<br>
&gt; <br>
&gt; So the SRH header SID list the SID entry=E2=80=99s provide the =E2=80=
=9Cnext hop=E2=80=9D to source route the traffic to the egress PE. So since=
 normally the IGP next hop is a link local would all the SID entries be lin=
k local and not GUA or ULA.<br>
&gt; <br>
&gt; So the destination in the IPv6 packet be traffic engineered would be t=
he L3 vpn VRF destination and the FEC to forward to the egress PE that term=
inates ibgp for vpnv4 vpnv6 is the loop /128 on the egress PE but to traffi=
c engineer to get their the SID list would have all the next hops listed si=
milar to a TE ERO explicit route object static LSP.<br>
&gt; <br>
&gt; Gyan<br>
&gt; <br>
&gt; Sent from my iPhone<br>
&gt; <br>
&gt;&gt; On Oct 11, 2019, at 10:05 AM, Ron Bonica &lt;<a href=3D"mailto:rbo=
nica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt; wrote:<br>
&gt;&gt;<br>
&gt;&gt; Gyan,<br>
&gt;&gt;<br>
&gt;&gt; Why exclude link local for adjacency segments?<br>
&gt;&gt;<br>
&gt;&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=A0Ron<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;<br>
&gt;&gt; -----Original Message-----<br>
&gt;&gt; From: Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.com" tar=
get=3D"_blank">hayabusagsm@gmail.com</a>&gt;<br>
&gt;&gt; Sent: Thursday, October 10, 2019 12:34 PM<br>
&gt;&gt; To: Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.=
wang@nokia-sbell.com" target=3D"_blank">weibin.wang@nokia-sbell.com</a>&gt;=
<br>
&gt;&gt; Cc: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=
=3D"_blank">rbonica@juniper.net</a>&gt;; Fernando Gont &lt;<a href=3D"mailt=
o:fgont@si6networks.com" target=3D"_blank">fgont@si6networks.com</a>&gt;; S=
PRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spri=
ng@ietf.org</a>&gt;<br>
&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -=
 IPv6 Addresses and SIDs<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; Makes sense.=C2=A0 I think from Ron=E2=80=99s question is types ad=
dress which would have to be a GUA or ULA IPv6 URIB FIB routeable 128 bit p=
refix so that would exclude multicast or link local since the prefix has to=
 a unicast address and routable and reachable within the domain.<br>
&gt;&gt;<br>
&gt;&gt; Ron<br>
&gt;&gt;<br>
&gt;&gt; I can take this back to 6MAN WG with regards to SID address types =
and structure should be defined clearly as it is not today.=C2=A0 Agreed.<b=
r>
&gt;&gt;<br>
&gt;&gt; Thanks<br>
&gt;&gt;<br>
&gt;&gt; Gyan<br>
&gt;&gt;<br>
&gt;&gt; Sent from my iPhone<br>
&gt;&gt;<br>
&gt;&gt;&gt; On Oct 10, 2019, at 4:44 AM, Wang, Weibin (NSB - CN/Shanghai) =
&lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com" target=3D"_blank">weibin=
.wang@nokia-sbell.com</a>&gt; wrote:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; The key character of SRv6 is the SRv6 SID has capability of ro=
utable function, it is reachable according to FIBv6, so the SIDs, I think, =
must be allocated from unicast IPv6 address space, because the SRv6 domain =
is limited and controlled by operator, such as deploying it within it&#39;s=
 AS domain, so ULA as well GUA, I think, are also options for SRv6 SID; and=
 the SID block is separate from plain IPv6 address block which are usually =
configured under Node&#39;s interfaces; so they are not overlap each other,=
 but Both of them must advertised by IGP or BGP protocol, they perform diff=
erent function within network; how to allocate the SID and how to indicate =
length of SID prefix May be up to operator and its specific network scenari=
o.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; --------------------------------------<br>
&gt;&gt;&gt; Cheers !<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; WANG Weibin<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt; From: spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" ta=
rget=3D"_blank">spring-bounces@ietf.org</a>&gt; On Behalf Of Gyan Mishra<br=
>
&gt;&gt;&gt; Sent: 2019=E5=B9=B410=E6=9C=8810=E6=97=A5 10:58<br>
&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" targ=
et=3D"_blank">rbonica@juniper.net</a>&gt;<br>
&gt;&gt;&gt; Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com"=
 target=3D"_blank">fgont@si6networks.com</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">sprin=
g@ietf.org</a>&gt;<br>
&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programmi=
ng -<br>
&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Hi Ron,<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; I read that as well in my SRv6 studies so thinking about it lo=
gically from an IGP ospf or ISIS longest match routing IPv6 FIB entry persp=
ective for me makes sense to understand the SRv6 IPv6 data plane.=C2=A0 So =
I think my interpretation is that the 128 bit SID is broken up into hierarc=
hy fields with intelligence but from a routing perspective it=E2=80=99s an =
IPv6 address of a connected interface on a P or PE router which is a /127 f=
or p2p links however it defines your =E2=80=9Cnext hop=E2=80=9D NH or =E2=
=80=9Cnext next hop=E2=80=9D NNH in the legacy MPLS TE FRR node or path pro=
tection or IP-LFA/Remote LFA or you can think of it like a MPLS TE autorout=
e or FA (forwarding adjacencies) and to use that path you have to static ne=
xt hop to the tunnel but in this SRv6 case it=E2=80=99s a next hop IPv6 add=
ress which is a full 128 bit address that is in the SID entry in the SID li=
st as the next hop for your FEC destination in the IPv6 FIB entry.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; To make this easier for me to understand the SRv6 spec and how=
 to interpret lets think of an example of a service provider core with an I=
Pv6 data plane path between ingress PE and egress and a egress FEC which is=
 the loopback0 for your ibgp peering vpn services which is the IPv6 destina=
tion last SID entry in the SID list which the one hop prior P would do it=
=E2=80=99s normal PSP similar to PHP in the mpls world.=C2=A0 So now imagin=
e each P router along the path to the destination PE has a bunch of /127 p2=
p links.=C2=A0 So now the 1st SID entry would be to the next hop P from the=
 originating PE that inserted the EH routing type 4 header SRH to source ro=
ute the traffic along the engineered path.=C2=A0 So now if you examine that=
 1st SID entry it is a 128 bit address with embedded information such as th=
e function and arguments in the station id so the actual IPv6 FIB entry for=
 the egress PE FEC destination would have a next hop of the P router which =
is the SID what the 1st SID contains which is a 128 bit address to route to=
 the 1st node which is the next hop PE. Once the packet arrives at the 1st =
node in the case the ingress P the station id IID is decoded for any functi=
ons or argument the need to be executed by the instruction PSSI.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; That=E2=80=99s my interpretation but I have to build this out =
in the lab do dig deeper into the bits and bytes.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Cheers,<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Gyan<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Sent from my iPhone<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; On Oct 9, 2019, at 8:02 PM, Ron Bonica &lt;<a href=3D"mail=
to:rbonica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt; wrote=
:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Gyan,<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; If the Locator were guaranteed to be 64 bits, as you sugge=
st, there would be no problem. However, the following text from Section 3.1=
 suggests otherwise.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; &quot;=C2=A0 =C2=A0An SRv6 SID is represented as LOC:FUNCT=
 where LOC (locator) is the L<br>
&gt;&gt;&gt;&gt; most significant bits and FUNCT (function) is the 128-L le=
ast<br>
&gt;&gt;&gt;&gt; significant bits of the SID.=C2=A0 L is called the locator=
 length and is<br>
&gt;&gt;&gt;&gt; flexible.=C2=A0 Each operator is free to use the locator l=
ength it<br>
&gt;&gt;&gt;&gt; chooses.=C2=A0 Most often the locator is routable and lead=
s to the node<br>
&gt;&gt;&gt;&gt; which instantiates that SID.=C2=A0 A control-plane protoco=
l might<br>
&gt;&gt;&gt;&gt; represent the locator as B:N where B is the SRv6 SID block=
 (IPv6<br>
&gt;&gt;&gt;&gt; subnet allocated for SRv6 SIDs by the operator) and N is t=
he<br>
&gt;&gt;&gt;&gt; identifier of the parent node.&quot;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&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=A0Ron<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt;&gt; From: Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.=
com" target=3D"_blank">hayabusagsm@gmail.com</a>&gt;<br>
&gt;&gt;&gt;&gt; Sent: Wednesday, October 9, 2019 7:21 PM<br>
&gt;&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" =
target=3D"_blank">rbonica@juniper.net</a>&gt;<br>
&gt;&gt;&gt;&gt; Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.=
com" target=3D"_blank">fgont@si6networks.com</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">s=
pring@ietf.org</a>&gt;<br>
&gt;&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-progr=
amming -<br>
&gt;&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; In-line comments<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Thanks<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Gyan<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Sent from my iPhone<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; On Oct 3, 2019, at 12:25 PM, Ron Bonica &lt;rbonica=3D=
<a href=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40juniper=
.net@dmarc.ietf.org</a>&gt; wrote:<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Fernando,<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Someone should. I think that the expertise to do this =
is in 6man.<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&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 Ron<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt;&gt;&gt; From: Fernando Gont &lt;<a href=3D"mailto:fgont@si6net=
works.com" target=3D"_blank">fgont@si6networks.com</a>&gt;<br>
&gt;&gt;&gt;&gt;&gt; Sent: Wednesday, October 2, 2019 3:11 PM<br>
&gt;&gt;&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.n=
et" target=3D"_blank">rbonica@juniper.net</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blan=
k">spring@ietf.org</a>&gt;<br>
&gt;&gt;&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-p=
rogramming -<br>
&gt;&gt;&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; On 1/10/19 23:30, Ron Bonica wrote:<br>
&gt;&gt;&gt;&gt;&gt;&gt; Authors,<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; The document should include a discussion of the re=
lationship<br>
&gt;&gt;&gt;&gt;&gt;&gt; between<br>
&gt;&gt;&gt;&gt;&gt;&gt; IPv6 addresses and SIDs. For example:<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; * From what address space can SIDs be drawn? Link =
local? Multicast? ULA?<br>
&gt;&gt;&gt;&gt;&gt;&gt; * Can a locator be longer than 64 bits? If so, how=
 can the rest of<br>
&gt;&gt;&gt;&gt;&gt;&gt; the<br>
&gt;&gt;&gt;&gt;&gt;&gt; /64 be used?<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; I&#39;m not saying that this shouldn&#39;t be done or =
that it is a bad idea,<br>
&gt;&gt;&gt;&gt;&gt; but I&#39;m curious if is anybody looking at this from=
 a higher level?<br>
&gt;&gt;&gt;&gt;&gt; (these seems pretty architectural to me)<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Thanks,<br>
&gt;&gt;&gt;&gt;&gt; --<br>
&gt;&gt;&gt;&gt;&gt; Fernando Gont<br>
&gt;&gt;&gt;&gt;&gt; SI6 Networks<br>
&gt;&gt;&gt;&gt;&gt; e-mail: <a href=3D"mailto:fgont@si6networks.com" targe=
t=3D"_blank">fgont@si6networks.com</a><br>
&gt;&gt;&gt;&gt;&gt; PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D=
55 1D4E 7492<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; [Gyan] The SRv6 SID format is below:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; So from an IPv6 data plane forwarding perspective the fixe=
d length 64 bit Locator is copied hop by hop into the destination address o=
f the IPv6 header to the tail end FEC destination egress PE and during fail=
over Ti-LFA kicks in additional EH is inserted {violating RFC 8200} at the =
PLR NNHOP to the similar to RLFA PQ node.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; So with SRV6 native traffic engineering the locator is eit=
her the physical IP on ingress interface along each hop or loopback along e=
ach hop and so is either a GUA or ULA but not LL or multicast address is wh=
at I understand from a technical standpoint.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;=C2=A0 From everything I have read the SID is fixed at 64 b=
it length maximum but I guess you can have a smaller then 64 bit locator.<b=
r>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; I am working on getting this setup in the lab now so that =
will really help understand the real world implementations.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; SRv6 SID format:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; 128-bits Segment IDs can be used and allocated for differe=
nt purposes, for example:<br>
&gt;&gt;&gt;&gt; =E2=80=A2 The first 64 bits can be used to direct traffic =
to a specific node<br>
&gt;&gt;&gt;&gt; in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D o=
f the program =E2=80=A2 The next 32 bits<br>
&gt;&gt;&gt;&gt; can be used to enforce some actions on the traffic =E2=80=
=93 the<br>
&gt;&gt;&gt;&gt; =E2=80=9Cfunction=E2=80=9Dpart =E2=80=A2 The remaining 32 =
bits can be used to pass some<br>
&gt;&gt;&gt;&gt; additional information =E2=80=93 the =E2=80=9Cargument=E2=
=80=9D part 128-bit SRv6 SID<br>
&gt;&gt;&gt;&gt; Locator: routed to the node performing the function Functi=
on: any<br>
&gt;&gt;&gt;&gt; possible function Flexible bit-length selection<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; _______________________________________________<br>
&gt;&gt;&gt;&gt;&gt; spring mailing list<br>
&gt;&gt;&gt;&gt;&gt; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">s=
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&gt;&gt;&gt;&gt;&gt; r<br>
&gt;&gt;&gt;&gt;&gt; i<br>
&gt;&gt;&gt;&gt;&gt; ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZG=
QRTz6hag6LoSzz<br>
&gt;&gt;&gt;&gt;&gt; 8<br>
&gt;&gt;&gt;&gt;&gt; K<br>
&gt;&gt;&gt;&gt;&gt; kBJW9qEVHARw$<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; _______________________________________________<br>
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4zGljf0E<br>
&gt;&gt;&gt; omr2PHEsckWh$ _______________________________________________<=
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&gt;&gt;&gt; omr2PHEsckWh$<br>
&gt; <br>
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&gt; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</=
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&gt; <br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"ltr"><div><p class=3D"M=
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nsultant</a></span></span><span><span style=3D"font-family:&quot;Segoe UI&q=
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In-Reply-To: <424b13a9a9bf4802b57c0609c92baad2@nokia-sbell.com>
From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Sat, 12 Oct 2019 09:22:42 -0400
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To: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
Cc: "Joel M. Halpern" <jmh@joelhalpern.com>, Ron Bonica <rbonica@juniper.net>,  SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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in-line

On Fri, Oct 11, 2019 at 10:50 PM Wang, Weibin (NSB - CN/Shanghai) <
weibin.wang@nokia-sbell.com> wrote:

> From SRv6 deployment perspective, we should NOT change & impact existing
> measure of allocating IPv6 address which are used for node=E2=80=99s IP i=
nterfaces
> and basic IGP/BGP routing, such as IPv6 for loopback and physic interface=
s
> within Node, that is basic requirement for normal IPv6 networking
> operation. So SRv6 SIDs had better be another extra IPv6 block for its
> purpose.
>
> As far as I know, the IPv6 GUA block which is now being allocated is  tha=
t
> its most significant bits  is =E2=80=9C001=E2=80=9D, in further, this blo=
ck has defined as
> the fixed format =E2=80=9C64bits prefix + 64bits IID=E2=80=9D in related =
RFCs, so I think
> the block May be not available for SRv6 SID. so suggest the authors of
> NET-PGM draft should clarify it.
>
>
>
> --------------------------------------
>
> *Cheers !*
>
>
>
   [Gyan]  What section in the draft does it state the addressing to be
used.  Also why can't you use GUA or ULA in the SRV6 domain as the IPv6
dataplane SID locator 64 bit field only has to be reachable within the
domain to get to any node within the domain.

>
>
> *WANG Weibin  *
>
>
>
> *From:* spring <spring-bounces@ietf.org> *On Behalf Of *Gyan Mishra
> *Sent:* 2019=E5=B9=B410=E6=9C=8812=E6=97=A5 0:52
> *To:* Joel M. Halpern <jmh@joelhalpern.com>; Ron Bonica <
> rbonica@juniper.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6
> Addresses and SIDs
>
>
>
>
>
> in-line comment
>
>
>
> On Fri, Oct 11, 2019 at 12:38 PM Gyan Mishra <hayabusagsm@gmail.com>
> wrote:
>
>
>
> Sorry I should have read through the draft more carefully as its depicted
> clearly in an example in section 3. So the SIDs must be "routable" within
> the SRv6 domain per the draft.
>
>
>
>
> https://tools.ietf.org/pdf/draft-ietf-spring-srv6-network-programming-04.=
pdf
>
>
>
>
> So the SID is definitely routable reachable and so must be GUI or ULA and
> cannot be a link local as it is rewriting the destination address with th=
is
> address to route the packet POP a SID entry hop by hop to source route th=
e
> packet to the egress node.  As far as the next hop it is still the
> traditional IGP OSPF or ISIS link local address which is programmed into
> the SID destination FIB entry as the next hop.  Sorry was confusion on my
> part as I confused the next hop being overwritten like next hops in TE ER=
O
> where in this case its the IPv6 data plane and the IPv6 header destinatio=
n
> is being overwritten to the next hop by the SRH SID entry being popped ho=
p
> by hop.
>
>
> ! Example
>
> show ip route    2001:DB8:B:1:100: fe80::EUI64
>
>
>
> So then I believe my statement is correct that the SID would be just ULA
> or GUA and not multicast or link local.
>
>
>
>   3. SRv6 SID As introduced in RFC8402 an SRv6 Segment Identifier is a
> 128-bit value. When an SRv6 SID is in the Destination Address field of an
> IPv6 header of a packet, it is routed through an IPv6 network as an IPv6
> address. Its processing is defined in
> [I-D.ietf-6man-segment-routing-header] section 4.3 and reproduced here as=
 a
> reminder. Without constraining the details of an implementation, the SR
> segment endpoint node creates Forwarding Information Base (FIB) entries f=
or
> its local SIDs. When an SRv6-capable node receives an IPv6 packet, it
> performs a longest-prefix-match lookup on the packets destination address=
. This
> lookup can return any of the following: - A FIB entry that represents a
> locally instantiated SRv6 SID - A FIB entry that represents a local
> interface, not locally instantiated as an SRv6 SID - A FIB entry that
> represents a non-local route - No Match This document formally defines
> behaviors and parameters for SRv6 SIDs.
>
>
>
> 3.1. SID format An SRv6 SID is represented as LOC:FUNCT where LOC
> (locator) is the L most significant bits and FUNCT (function) is the 128-=
L
> least significant bits of the SID. L is called the locator length and is
> flexible. *Each operator is free to use the locator length it chooses.*
> Most often the locator is routable and leads to the node which instantiat=
es
> that SID. A control-plane protocol might represent the locator as B:N whe=
re
> B is the SRv6 SID block (IPv6 subnet allocated for SRv6 SIDs by the
> operator) and N is the identifier of the parent node. The function part
> of the SID is an opaque identification of a local behavior bound to the
> SID. The FUNCT value zero is invalid.
>
>   The terminology "function" refers to the bit-string in the SRv6 SID. Th=
e
> terminology "behavior" identifies the pseudocode bound to the SID. The
> behaviors are defined in Section 4 of this document. A behavior may requi=
re
> additional arguments that would be placed immediately after the FUNCT. In
> such case, the SRv6 SID will have the form LOC:FUNCT:ARGS::. For this
> reason, the SRv6 SIDs are matched on a per longest-prefix-match basis. AR=
G
> may contain information related to the flow, service, or any other
> information required by FUNCT. The ARG value of a routed SID SHOULD remai=
n
> constant among packets in a given flow. Varying ARG values among packets =
in
> a flow may result in different ECMP hashing and cause re-ordering.
>
>
>
> 3.2. SID reachability Most often, the node N would advertise IPv6
> prefix(es) matching the LOC parts covering its SIDs or shorter-mask prefi=
x.
> The distribution of these advertisements and calculation of their
> reachability are routing protocol specific aspects that are outside the
> scope of this document. An SRv6 SID is said to be routed if its SID
> belongs to an IPv6 prefix advertised via a routing protocol. *An SRv6 SID
> that does not fulfill this condition is non-routed.* Let=E2=80=99s provid=
e a
> classic illustration: Node N is configured explicitly with two SIDs:
> 2001:DB8:B:1:100:: and 2001:DB8:B:2:101::. The network learns about a pat=
h
> to 2001:DB8:B:1::/64 via the IGP and hence a packet destined to
> 2001:DB8:B:1:100:: would be routed up to N. The network does not learn
> about a path to 2001:DB8:B:2::/64 via the IGP and hence a packet destined
> to 2001:DB8:B:2:101:: would not be routed up to N. A packet could be
> steered to a non-routed SID 2001:DB8:B:2:101:: by using a SID list
> <...,2001:DB8:B:1:100::,2001:DB8:B:2:101::,...> where the non-routed SID =
is
> preceded by a routed SID to the same node. Routed and non-routed SRv6 SID=
s
> are the SRv6 instantiation of global and local segments, respectively
> [RFC8402].
>
>
>
>     [Gyan]  In section 3.1  I bolded " Each operator is free to use the
> locator length it chooses." So I guess the locator field is 64 bits but I
> guess you could have a shorter locator field.
>
>     So I guess what it sounds like  how this would work is imagine a SP
> core with many P routers hops along a path to an egress PE node and each =
P
> has tons of /127s links meshed through the P core.
>
>
>
>     I am trying to envision how the addressing plan would work for SRv6 S=
P
> core.
>
>
>
>    So each P node in the core would have a /64 allocated to it which is i=
n
> essence a "summary route"  that contains all the contiguous /127s that
> reside on that P node and has a Loopback or virtual interface that has th=
is
> /64 that is routable kind of like a BGP summary route and that is
> advertised into the IGP by every P router and every P router has this
> special /64 for SRv6 routing that is used for the SRH SID list to build a=
ny
> to any SRv6 TE paths.
>
>
>
> So once you route hop by hop to that SID locator which is the /64 then as
> you land on each node you can do the PSSI and process the function/argume=
nt
> or what ever tasks need to be done hop by hop along the path to the egres=
s
> PE FEC destination.
>
>
>
> So now any ingress PE SRH would have in its RIB/FIB all the /64s for all
> the loops that represent each P node in the core to build the SID list fo=
r
> the traffic engineered path.
>
>
>
> So now this /64 Locator is what the draft is stating can be any length
> meaning shorter then /64 for either GUI or ULA implementations.
>
>
>
>
>
>
>
> Gyan
>
>
>
>
>
>
>
> On Fri, Oct 11, 2019 at 11:12 AM Joel M. Halpern <jmh@joelhalpern.com>
> wrote:
>
> If we need to see a running implementation to judge what the behavior is
> supposed to be, it sounds like we could use clarifications of the
> specification.
>
> Yours,
> Joel
>
> On 10/11/2019 11:06 AM, Gyan Mishra wrote:
> >
> > Good point.  I think we need someone who has this in the lab or prod to
> see the exact implemented behavior.
> >
> > So since the URIB entry for the FEC destination egress PE prefix has th=
e
> next hop for the IGP used for IPv6 set to the =E2=80=9Clink local next ho=
p would
> the SID entry in the SID list be all link local addresses.
> >
> > So the SRH header SID list the SID entry=E2=80=99s provide the =E2=80=
=9Cnext hop=E2=80=9D to
> source route the traffic to the egress PE. So since normally the IGP next
> hop is a link local would all the SID entries be link local and not GUA o=
r
> ULA.
> >
> > So the destination in the IPv6 packet be traffic engineered would be th=
e
> L3 vpn VRF destination and the FEC to forward to the egress PE that
> terminates ibgp for vpnv4 vpnv6 is the loop /128 on the egress PE but to
> traffic engineer to get their the SID list would have all the next hops
> listed similar to a TE ERO explicit route object static LSP.
> >
> > Gyan
> >
> > Sent from my iPhone
> >
> >> On Oct 11, 2019, at 10:05 AM, Ron Bonica <rbonica@juniper.net> wrote:
> >>
> >> Gyan,
> >>
> >> Why exclude link local for adjacency segments?
> >>
> >>                             Ron
> >>
> >>
> >>
> >> Juniper Business Use Only
> >>
> >> -----Original Message-----
> >> From: Gyan Mishra <hayabusagsm@gmail.com>
> >> Sent: Thursday, October 10, 2019 12:34 PM
> >> To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>
> >> Cc: Ron Bonica <rbonica@juniper.net>; Fernando Gont <
> fgont@si6networks.com>; SPRING WG List <spring@ietf.org>
> >> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv=
6
> Addresses and SIDs
> >>
> >>
> >>
> >> Makes sense.  I think from Ron=E2=80=99s question is types address whi=
ch would
> have to be a GUA or ULA IPv6 URIB FIB routeable 128 bit prefix so that
> would exclude multicast or link local since the prefix has to a unicast
> address and routable and reachable within the domain.
> >>
> >> Ron
> >>
> >> I can take this back to 6MAN WG with regards to SID address types and
> structure should be defined clearly as it is not today.  Agreed.
> >>
> >> Thanks
> >>
> >> Gyan
> >>
> >> Sent from my iPhone
> >>
> >>> On Oct 10, 2019, at 4:44 AM, Wang, Weibin (NSB - CN/Shanghai) <
> weibin..wang@nokia-sbell.com <weibin.wang@nokia-sbell.com>> wrote:
> >>>
> >>> The key character of SRv6 is the SRv6 SID has capability of routable
> function, it is reachable according to FIBv6, so the SIDs, I think, must =
be
> allocated from unicast IPv6 address space, because the SRv6 domain is
> limited and controlled by operator, such as deploying it within it's AS
> domain, so ULA as well GUA, I think, are also options for SRv6 SID; and t=
he
> SID block is separate from plain IPv6 address block which are usually
> configured under Node's interfaces; so they are not overlap each other, b=
ut
> Both of them must advertised by IGP or BGP protocol, they perform differe=
nt
> function within network; how to allocate the SID and how to indicate leng=
th
> of SID prefix May be up to operator and its specific network scenario.
> >>>
> >>> --------------------------------------
> >>> Cheers !
> >>>
> >>>
> >>> WANG Weibin
> >>>
> >>> -----Original Message-----
> >>> From: spring <spring-bounces@ietf.org> On Behalf Of Gyan Mishra
> >>> Sent: 2019=E5=B9=B410=E6=9C=8810=E6=97=A5 10:58
> >>> To: Ron Bonica <rbonica@juniper.net>
> >>> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List
> >>> <spring@ietf.org>
> >>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
> >>> IPv6 Addresses and SIDs
> >>>
> >>>
> >>> Hi Ron,
> >>>
> >>> I read that as well in my SRv6 studies so thinking about it logically
> from an IGP ospf or ISIS longest match routing IPv6 FIB entry perspective
> for me makes sense to understand the SRv6 IPv6 data plane.  So I think my
> interpretation is that the 128 bit SID is broken up into hierarchy fields
> with intelligence but from a routing perspective it=E2=80=99s an IPv6 add=
ress of a
> connected interface on a P or PE router which is a /127 for p2p links
> however it defines your =E2=80=9Cnext hop=E2=80=9D NH or =E2=80=9Cnext ne=
xt hop=E2=80=9D NNH in the legacy
> MPLS TE FRR node or path protection or IP-LFA/Remote LFA or you can think
> of it like a MPLS TE autoroute or FA (forwarding adjacencies) and to use
> that path you have to static next hop to the tunnel but in this SRv6 case
> it=E2=80=99s a next hop IPv6 address which is a full 128 bit address that=
 is in the
> SID entry in the SID list as the next hop for your FEC destination in the
> IPv6 FIB entry.
> >>>
> >>> To make this easier for me to understand the SRv6 spec and how to
> interpret lets think of an example of a service provider core with an IPv=
6
> data plane path between ingress PE and egress and a egress FEC which is t=
he
> loopback0 for your ibgp peering vpn services which is the IPv6 destinatio=
n
> last SID entry in the SID list which the one hop prior P would do it=E2=
=80=99s
> normal PSP similar to PHP in the mpls world.  So now imagine each P route=
r
> along the path to the destination PE has a bunch of /127 p2p links.  So n=
ow
> the 1st SID entry would be to the next hop P from the originating PE that
> inserted the EH routing type 4 header SRH to source route the traffic alo=
ng
> the engineered path.  So now if you examine that 1st SID entry it is a 12=
8
> bit address with embedded information such as the function and arguments =
in
> the station id so the actual IPv6 FIB entry for the egress PE FEC
> destination would have a next hop of the P router which is the SID what t=
he
> 1st SID contains which is a 128 bit address to route to the 1st node whic=
h
> is the next hop PE. Once the packet arrives at the 1st node in the case t=
he
> ingress P the station id IID is decoded for any functions or argument the
> need to be executed by the instruction PSSI.
> >>>
> >>> That=E2=80=99s my interpretation but I have to build this out in the =
lab do
> dig deeper into the bits and bytes.
> >>>
> >>> Cheers,
> >>>
> >>> Gyan
> >>>
> >>> Sent from my iPhone
> >>>
> >>>> On Oct 9, 2019, at 8:02 PM, Ron Bonica <rbonica@juniper.net> wrote:
> >>>>
> >>>> Gyan,
> >>>>
> >>>> If the Locator were guaranteed to be 64 bits, as you suggest, there
> would be no problem. However, the following text from Section 3.1 suggest=
s
> otherwise.
> >>>>
> >>>> "   An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is
> the L
> >>>> most significant bits and FUNCT (function) is the 128-L least
> >>>> significant bits of the SID.  L is called the locator length and is
> >>>> flexible.  Each operator is free to use the locator length it
> >>>> chooses.  Most often the locator is routable and leads to the node
> >>>> which instantiates that SID.  A control-plane protocol might
> >>>> represent the locator as B:N where B is the SRv6 SID block (IPv6
> >>>> subnet allocated for SRv6 SIDs by the operator) and N is the
> >>>> identifier of the parent node."
> >>>>
> >>>>                                                                   Ro=
n
> >>>>
> >>>>
> >>>>
> >>>> Juniper Business Use Only
> >>>>
> >>>> -----Original Message-----
> >>>> From: Gyan Mishra <hayabusagsm@gmail.com>
> >>>> Sent: Wednesday, October 9, 2019 7:21 PM
> >>>> To: Ron Bonica <rbonica@juniper.net>
> >>>> Cc: Fernando Gont <fgont@si6networks.com>; SPRING WG List
> >>>> <spring@ietf.org>
> >>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
> >>>> IPv6 Addresses and SIDs
> >>>>
> >>>>
> >>>>
> >>>> In-line comments
> >>>>
> >>>> Thanks
> >>>>
> >>>> Gyan
> >>>>
> >>>> Sent from my iPhone
> >>>>
> >>>>> On Oct 3, 2019, at 12:25 PM, Ron Bonica <rbonica=3D
> 40juniper..net@dmarc.ietf.org <40juniper.net@dmarc.ietf.org>> wrote:
> >>>>>
> >>>>> Fernando,
> >>>>>
> >>>>> Someone should. I think that the expertise to do this is in 6man.
> >>>>>
> >>>>>                                Ron
> >>>>>
> >>>>>
> >>>>> Juniper Business Use Only
> >>>>>
> >>>>> -----Original Message-----
> >>>>> From: Fernando Gont <fgont@si6networks.com>
> >>>>> Sent: Wednesday, October 2, 2019 3:11 PM
> >>>>> To: Ron Bonica <rbonica@juniper.net>; SPRING WG List
> >>>>> <spring@ietf.org>
> >>>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
> >>>>> IPv6 Addresses and SIDs
> >>>>>
> >>>>>> On 1/10/19 23:30, Ron Bonica wrote:
> >>>>>> Authors,
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> The document should include a discussion of the relationship
> >>>>>> between
> >>>>>> IPv6 addresses and SIDs. For example:
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> * From what address space can SIDs be drawn? Link local? Multicast=
?
> ULA?
> >>>>>> * Can a locator be longer than 64 bits? If so, how can the rest of
> >>>>>> the
> >>>>>> /64 be used?
> >>>>>
> >>>>> I'm not saying that this shouldn't be done or that it is a bad idea=
,
> >>>>> but I'm curious if is anybody looking at this from a higher level?
> >>>>> (these seems pretty architectural to me)
> >>>>>
> >>>>> Thanks,
> >>>>> --
> >>>>> Fernando Gont
> >>>>> SI6 Networks
> >>>>> e-mail: fgont@si6networks.com
> >>>>> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
> >>>>>
> >>>>>
> >>>>
> >>>> [Gyan] The SRv6 SID format is below:
> >>>>
> >>>> So from an IPv6 data plane forwarding perspective the fixed length 6=
4
> bit Locator is copied hop by hop into the destination address of the IPv6
> header to the tail end FEC destination egress PE and during failover Ti-L=
FA
> kicks in additional EH is inserted {violating RFC 8200} at the PLR NNHOP =
to
> the similar to RLFA PQ node.
> >>>>
> >>>> So with SRV6 native traffic engineering the locator is either the
> physical IP on ingress interface along each hop or loopback along each ho=
p
> and so is either a GUA or ULA but not LL or multicast address is what I
> understand from a technical standpoint.
> >>>>
> >>>>  From everything I have read the SID is fixed at 64 bit length
> maximum but I guess you can have a smaller then 64 bit locator.
> >>>>
> >>>> I am working on getting this setup in the lab now so that will reall=
y
> help understand the real world implementations.
> >>>>
> >>>> SRv6 SID format:
> >>>>
> >>>> 128-bits Segment IDs can be used and allocated for different
> purposes, for example:
> >>>> =E2=80=A2 The first 64 bits can be used to direct traffic to a speci=
fic node
> >>>> in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D of the prog=
ram =E2=80=A2 The next 32 bits
> >>>> can be used to enforce some actions on the traffic =E2=80=93 the
> >>>> =E2=80=9Cfunction=E2=80=9Dpart =E2=80=A2 The remaining 32 bits can b=
e used to pass some
> >>>> additional information =E2=80=93 the =E2=80=9Cargument=E2=80=9D part=
 128-bit SRv6 SID
> >>>> Locator: routed to the node performing the function Function: any
> >>>> possible function Flexible bit-length selection
> >>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> spring mailing list
> >>>>> spring@ietf.org
> >>>>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/s=
p
> <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/sp>
> >>>>> r
> >>>>> i
> >>>>> ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZGQRTz6hag6LoSz=
z
> >>>>> 8
> >>>>> K
> >>>>> kBJW9qEVHARw$
> >>>
> >>> _______________________________________________
> >>> spring mailing list
> >>> spring@ietf.org
> >>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spr=
i
> <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/spri>
> >>> ng__;!8WoA6RjC81c!Qg1ex-hXVBJKRryAR1Hl5x2o9By4PbwD0gDjfRxlvNtQ4zGljf0=
E
> >>> omr2PHEsckWh$ _______________________________________________
> >>> spring mailing list
> >>> spring@ietf.org
> >>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spr=
i
> <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/spri>
> >>> ng__;!8WoA6RjC81c!Qg1ex-hXVBJKRryAR1Hl5x2o9By4PbwD0gDjfRxlvNtQ4zGljf0=
E
> >>> omr2PHEsckWh$
> >
> > _______________________________________________
> > spring mailing list
> > spring@ietf.org
> > https://www.ietf.org/mailman/listinfo/spring
> >
>
>
>
>
> --
>
> 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
>
>
>
>
>
>
> --
>
> 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
>
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>


--=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

--0000000000003ae1c70594b6881a
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>in-line</div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Fri, Oct 11, 2019 at 10:50 PM Wang, Weibin=
 (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com">wei=
bin.wang@nokia-sbell.com</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">





<div lang=3D"ZH-CN">
<div class=3D"gmail-m_-4383355686436608175WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif">From SRv6 deployment perspective, we should NOT =
change &amp; impact existing measure of allocating IPv6 address which are u=
sed for node=E2=80=99s IP interfaces and basic IGP/BGP
 routing, such as IPv6 for loopback and physic interfaces within Node, that=
 is basic requirement for normal IPv6 networking operation. So SRv6 SIDs ha=
d better be another extra IPv6 block for its purpose.<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif">As far as I know, the IPv6 GUA block which is no=
w being allocated is =C2=A0that its most significant bits =C2=A0is =E2=80=
=9C001=E2=80=9D, in further, this block has defined as the fixed
 format =E2=80=9C64bits prefix + 64bits IID=E2=80=9D in related RFCs, so I =
think the block May be not available for SRv6 SID. so suggest the authors o=
f NET-PGM draft should clarify it.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;font-family:Calibri,sans-serif">-------------------=
-------------------<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><i><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,serif">C=
heers !<u></u><u></u></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;font-family:Calibri,sans-serif"><u></u>=C2=A0</span=
></p></div></div></blockquote><div>=C2=A0 =C2=A0[Gyan]=C2=A0 What section i=
n the draft does it state the addressing to be used.=C2=A0 Also why can&#39=
;t you use GUA or ULA in the SRV6 domain as the IPv6 dataplane SID locator =
64 bit field only has to be reachable within the domain to get to any node =
within the domain.</div><blockquote class=3D"gmail_quote" style=3D"margin:0=
px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><=
div lang=3D"ZH-CN"><div class=3D"gmail-m_-4383355686436608175WordSection1">=
<p class=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;font-family:Calibri,sans-serif"><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><b><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:Arial,sans-serif"><u></u>=C2=A0<u></=
u></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><b><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,serif">W=
ANG Weibin=C2=A0
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11pt;font=
-family:Calibri,sans-serif">From:</span></b><span lang=3D"EN-US" style=3D"f=
ont-size:11pt;font-family:Calibri,sans-serif"> spring &lt;<a href=3D"mailto=
:spring-bounces@ietf.org" target=3D"_blank">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Gyan Mishra<br>
<b>Sent:</b> 2019</span><span style=3D"font-size:11pt">=E5=B9=B4</span><spa=
n lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif">10=
</span><span style=3D"font-size:11pt">=E6=9C=88</span><span lang=3D"EN-US" =
style=3D"font-size:11pt;font-family:Calibri,sans-serif">12</span><span styl=
e=3D"font-size:11pt">=E6=97=A5</span><span lang=3D"EN-US" style=3D"font-siz=
e:11pt;font-family:Calibri,sans-serif">
 0:52<br>
<b>To:</b> Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com" targe=
t=3D"_blank">jmh@joelhalpern.com</a>&gt;; Ron Bonica &lt;<a href=3D"mailto:=
rbonica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming - I=
Pv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">in-line comment<u></u><u></u></=
span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Fri, Oct 11, 2019 at 12:38 P=
M Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.com" target=3D"_blank=
">hayabusagsm@gmail.com</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sorry I should have read throug=
h the draft more carefully as its depicted clearly in an example in section=
 3. So the SIDs must be &quot;routable&quot; within the SRv6 domain per the=
 draft.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://tools.ietf.o=
rg/pdf/draft-ietf-spring-srv6-network-programming-04.pdf" target=3D"_blank"=
>https://tools.ietf.org/pdf/draft-ietf-spring-srv6-network-programming-04.p=
df</a>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">So the SID is definitely routab=
le reachable and so must be GUI or ULA and cannot be a link local as it is =
rewriting the destination address with this address to route the packet POP=
 a SID entry hop by hop to source route
 the packet to the egress node.=C2=A0 As far as the next hop it is still th=
e traditional IGP OSPF or ISIS link local address which is programmed into =
the SID destination FIB entry as the next hop.=C2=A0 Sorry was confusion on=
 my part as I confused the next hop being
 overwritten like next hops in TE ERO where in this case its the IPv6 data =
plane and the IPv6 header destination is being overwritten to the next hop =
by the SRH SID entry being popped hop by hop.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><br>
! Example<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">show ip route=C2=A0 =C2=A0 2001=
:DB8:B:1:100: fe80::EUI64=C2=A0=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">So then I believe my statement =
is correct that the SID would be just ULA or GUA and not multicast or link =
local.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0 3. SRv6 SID As introduce=
d in RFC8402 an SRv6 Segment Identifier is a 128-bit value. When an SRv6 SI=
D is in the Destination Address field of an IPv6 header of a packet, it is =
routed through an IPv6 network as an IPv6
 address. Its processing is defined in [I-D.ietf-6man-segment-routing-heade=
r] section 4.3 and reproduced here as a reminder. Without constraining the =
details of an implementation, the SR segment endpoint node creates Forwardi=
ng Information Base (FIB) entries
 for its local SIDs. <span style=3D"color:red">When an SRv6-capable node re=
ceives an IPv6 packet, it performs a longest-prefix-match lookup on the pac=
kets destination address.
</span>This lookup can return any of the following: - A FIB entry that repr=
esents a locally instantiated SRv6 SID - A FIB entry that represents a loca=
l interface, not locally instantiated as an SRv6 SID -
<span style=3D"color:red">A FIB entry that represents a non-local route </s=
pan>- No Match This document formally defines behaviors and parameters for =
SRv6 SIDs.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">3.1. SID format An SRv6 SID is =
represented as LOC:FUNCT where LOC (locator) is the L most significant bits=
 and FUNCT (function) is the 128-L least significant bits of the SID. L is =
called the locator length and is flexible.
<b><span style=3D"color:red">Each operator is free to use the locator lengt=
h it chooses.</span></b><span style=3D"color:red"> Most often the locator i=
s routable and leads to the node which instantiates that SID. A control-pla=
ne protocol might represent the locator
 as B:N where B is the SRv6 SID block (IPv6 subnet allocated for SRv6 SIDs =
by the operator) and N is the identifier of the parent node.</span> The fun=
ction part of the SID is an opaque identification of a local behavior bound=
 to the SID. The FUNCT value zero
 is invalid. =C2=A0=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0 The terminology &quot;fu=
nction&quot; refers to the bit-string in the SRv6 SID. The terminology &quo=
t;behavior&quot; identifies the pseudocode bound to the SID. The behaviors =
are defined in Section 4 of this document. A behavior may require
 additional arguments that would be placed immediately after the FUNCT. In =
such case, the SRv6 SID will have the form LOC:FUNCT:ARGS::. For this reaso=
n, the SRv6 SIDs are matched on a per longest-prefix-match basis. ARG may c=
ontain information related to the
 flow, service, or any other information required by FUNCT. The ARG value o=
f a routed SID SHOULD remain constant among packets in a given flow. Varyin=
g ARG values among packets in a flow may result in different ECMP hashing a=
nd cause re-ordering.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">3.2. <span style=3D"color:red">=
SID reachability Most often, the node N would advertise IPv6 prefix(es) mat=
ching the LOC parts covering its SIDs or shorter-mask prefix.</span> The di=
stribution of these advertisements and
 calculation of their reachability are routing protocol specific aspects th=
at are outside the scope of this document.
<span style=3D"color:red">An SRv6 SID is said to be routed if its SID belon=
gs to an IPv6 prefix advertised via a routing protocol.
<b>An SRv6 SID that does not fulfill this condition is non-routed.</b></spa=
n> Let=E2=80=99s provide a classic illustration: Node N is configured expli=
citly with two SIDs: 2001:DB8:B:1:100:: and 2001:DB8:B:2:101::. The network=
 learns about a path to 2001:DB8:B:1::/64
 via the IGP and hence a packet destined to 2001:DB8:B:1:100:: would be rou=
ted up to N. The network does not learn about a path to 2001:DB8:B:2::/64 v=
ia the IGP and hence a packet destined to 2001:DB8:B:2:101:: would not be r=
outed up to N.
<span style=3D"color:red">A packet could be steered to a non-routed SID 200=
1:DB8:B:2:101:: by using a SID list &lt;...,2001:DB8:B:1:100::,2001:DB8:B:2=
:101::,...&gt; where the non-routed SID is preceded by a routed SID to the =
same node. Routed and non-routed SRv6 SIDs
 are the SRv6 instantiation of global and local segments, respectively [RFC=
8402]. =C2=A0=C2=A0</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0 =C2=A0 [Gyan]=C2=A0 In s=
ection 3.1=C2=A0 I bolded &quot; Each operator is free to use the locator l=
ength it chooses.&quot; So I guess the locator field is 64 bits but I guess=
 you could have a shorter locator field.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0 =C2=A0 So I guess what i=
t sounds like=C2=A0 how this would work is imagine a SP core with many P ro=
uters hops along a path to an egress PE node and each P has tons of /127s l=
inks meshed through the P core.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0 =C2=A0 I am trying to en=
vision how the addressing plan would work for SRv6 SP core.<u></u><u></u></=
span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0 =C2=A0So each P node in =
the core would have a /64 allocated to it which is in essence a &quot;summa=
ry route&quot;=C2=A0 that contains all the contiguous /127s that reside on =
that P node and has a Loopback or virtual interface that has
 this /64 that is routable kind of like a BGP summary route and that is adv=
ertised into the IGP by every P router and every P router has this special =
/64 for SRv6 routing that is used for the SRH SID list to build any to any =
SRv6 TE paths.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">So once you route hop by hop to=
 that SID locator which is the /64 then as you land on each node you can do=
 the PSSI and process the function/argument or what ever tasks need to be d=
one hop by hop along the path to the
 egress PE FEC destination.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">So now any ingress PE SRH would=
 have in its RIB/FIB all the /64s for all the loops that represent each P n=
ode in the core to build the SID list for the traffic engineered path.=C2=
=A0=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">So now this /64 Locator is what=
 the draft is stating can be any length meaning shorter then /64 for either=
 GUI or ULA implementations.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Gyan<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Fri, Oct 11, 2019 at 11:12 A=
M Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com" target=3D"_bla=
nk">jmh@joelhalpern.com</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
<p class=3D"MsoNormal"><span lang=3D"EN-US">If we need to see a running imp=
lementation to judge what the behavior is
<br>
supposed to be, it sounds like we could use clarifications of the <br>
specification.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 10/11/2019 11:06 AM, Gyan Mishra wrote:<br>
&gt; <br>
&gt; Good point.=C2=A0 I think we need someone who has this in the lab or p=
rod to see the exact implemented behavior.<br>
&gt; <br>
&gt; So since the URIB entry for the FEC destination egress PE prefix has t=
he next hop for the IGP used for IPv6 set to the =E2=80=9Clink local next h=
op would the SID entry in the SID list be all link local addresses.<br>
&gt; <br>
&gt; So the SRH header SID list the SID entry=E2=80=99s provide the =E2=80=
=9Cnext hop=E2=80=9D to source route the traffic to the egress PE. So since=
 normally the IGP next hop is a link local would all the SID entries be lin=
k local and not GUA or ULA.<br>
&gt; <br>
&gt; So the destination in the IPv6 packet be traffic engineered would be t=
he L3 vpn VRF destination and the FEC to forward to the egress PE that term=
inates ibgp for vpnv4 vpnv6 is the loop /128 on the egress PE but to traffi=
c engineer to get their the SID list
 would have all the next hops listed similar to a TE ERO explicit route obj=
ect static LSP.<br>
&gt; <br>
&gt; Gyan<br>
&gt; <br>
&gt; Sent from my iPhone<br>
&gt; <br>
&gt;&gt; On Oct 11, 2019, at 10:05 AM, Ron Bonica &lt;<a href=3D"mailto:rbo=
nica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt; wrote:<br>
&gt;&gt;<br>
&gt;&gt; Gyan,<br>
&gt;&gt;<br>
&gt;&gt; Why exclude link local for adjacency segments?<br>
&gt;&gt;<br>
&gt;&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=A0Ron<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;<br>
&gt;&gt; -----Original Message-----<br>
&gt;&gt; From: Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.com" tar=
get=3D"_blank">hayabusagsm@gmail.com</a>&gt;<br>
&gt;&gt; Sent: Thursday, October 10, 2019 12:34 PM<br>
&gt;&gt; To: Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.=
wang@nokia-sbell.com" target=3D"_blank">weibin.wang@nokia-sbell.com</a>&gt;=
<br>
&gt;&gt; Cc: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=
=3D"_blank">rbonica@juniper.net</a>&gt;; Fernando Gont &lt;<a href=3D"mailt=
o:fgont@si6networks.com" target=3D"_blank">fgont@si6networks.com</a>&gt;; S=
PRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spri=
ng@ietf.org</a>&gt;<br>
&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -=
 IPv6 Addresses and SIDs<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; Makes sense.=C2=A0 I think from Ron=E2=80=99s question is types ad=
dress which would have to be a GUA or ULA IPv6 URIB FIB routeable 128 bit p=
refix so that would exclude multicast or link local since the prefix has to=
 a unicast address and routable and reachable within
 the domain.<br>
&gt;&gt;<br>
&gt;&gt; Ron<br>
&gt;&gt;<br>
&gt;&gt; I can take this back to 6MAN WG with regards to SID address types =
and structure should be defined clearly as it is not today.=C2=A0 Agreed.<b=
r>
&gt;&gt;<br>
&gt;&gt; Thanks<br>
&gt;&gt;<br>
&gt;&gt; Gyan<br>
&gt;&gt;<br>
&gt;&gt; Sent from my iPhone<br>
&gt;&gt;<br>
&gt;&gt;&gt; On Oct 10, 2019, at 4:44 AM, Wang, Weibin (NSB - CN/Shanghai) =
&lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com" target=3D"_blank">weibin=
..wang@nokia-sbell.com</a>&gt; wrote:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; The key character of SRv6 is the SRv6 SID has capability of ro=
utable function, it is reachable according to FIBv6, so the SIDs, I think, =
must be allocated from unicast IPv6 address space, because the SRv6 domain =
is limited and controlled by operator, such
 as deploying it within it&#39;s AS domain, so ULA as well GUA, I think, ar=
e also options for SRv6 SID; and the SID block is separate from plain IPv6 =
address block which are usually configured under Node&#39;s interfaces; so =
they are not overlap each other, but Both
 of them must advertised by IGP or BGP protocol, they perform different fun=
ction within network; how to allocate the SID and how to indicate length of=
 SID prefix May be up to operator and its specific network scenario.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; --------------------------------------<br>
&gt;&gt;&gt; Cheers !<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; WANG Weibin<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt; From: spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" ta=
rget=3D"_blank">spring-bounces@ietf.org</a>&gt; On Behalf Of Gyan Mishra<br=
>
&gt;&gt;&gt; Sent: 2019</span>=E5=B9=B4<span lang=3D"EN-US">10</span>=E6=9C=
=88<span lang=3D"EN-US">10</span>=E6=97=A5<span lang=3D"EN-US"> 10:58<br>
&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" targ=
et=3D"_blank">rbonica@juniper.net</a>&gt;<br>
&gt;&gt;&gt; Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com"=
 target=3D"_blank">fgont@si6networks.com</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">sprin=
g@ietf.org</a>&gt;<br>
&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programmi=
ng -<br>
&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Hi Ron,<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; I read that as well in my SRv6 studies so thinking about it lo=
gically from an IGP ospf or ISIS longest match routing IPv6 FIB entry persp=
ective for me makes sense to understand the SRv6 IPv6 data plane.=C2=A0 So =
I think my interpretation is that the 128 bit
 SID is broken up into hierarchy fields with intelligence but from a routin=
g perspective it=E2=80=99s an IPv6 address of a connected interface on a P =
or PE router which is a /127 for p2p links however it defines your =E2=80=
=9Cnext hop=E2=80=9D NH or =E2=80=9Cnext next hop=E2=80=9D NNH in the legac=
y
 MPLS TE FRR node or path protection or IP-LFA/Remote LFA or you can think =
of it like a MPLS TE autoroute or FA (forwarding adjacencies) and to use th=
at path you have to static next hop to the tunnel but in this SRv6 case it=
=E2=80=99s a next hop IPv6 address which
 is a full 128 bit address that is in the SID entry in the SID list as the =
next hop for your FEC destination in the IPv6 FIB entry.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; To make this easier for me to understand the SRv6 spec and how=
 to interpret lets think of an example of a service provider core with an I=
Pv6 data plane path between ingress PE and egress and a egress FEC which is=
 the loopback0 for your ibgp peering vpn
 services which is the IPv6 destination last SID entry in the SID list whic=
h the one hop prior P would do it=E2=80=99s normal PSP similar to PHP in th=
e mpls world.=C2=A0 So now imagine each P router along the path to the dest=
ination PE has a bunch of /127 p2p links.=C2=A0 So
 now the 1st SID entry would be to the next hop P from the originating PE t=
hat inserted the EH routing type 4 header SRH to source route the traffic a=
long the engineered path.=C2=A0 So now if you examine that 1st SID entry it=
 is a 128 bit address with embedded information
 such as the function and arguments in the station id so the actual IPv6 FI=
B entry for the egress PE FEC destination would have a next hop of the P ro=
uter which is the SID what the 1st SID contains which is a 128 bit address =
to route to the 1st node which is
 the next hop PE. Once the packet arrives at the 1st node in the case the i=
ngress P the station id IID is decoded for any functions or argument the ne=
ed to be executed by the instruction PSSI.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; That=E2=80=99s my interpretation but I have to build this out =
in the lab do dig deeper into the bits and bytes.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Cheers,<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Gyan<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Sent from my iPhone<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; On Oct 9, 2019, at 8:02 PM, Ron Bonica &lt;<a href=3D"mail=
to:rbonica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt; wrote=
:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Gyan,<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; If the Locator were guaranteed to be 64 bits, as you sugge=
st, there would be no problem. However, the following text from Section 3.1=
 suggests otherwise.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; &quot;=C2=A0 =C2=A0An SRv6 SID is represented as LOC:FUNCT=
 where LOC (locator) is the L<br>
&gt;&gt;&gt;&gt; most significant bits and FUNCT (function) is the 128-L le=
ast<br>
&gt;&gt;&gt;&gt; significant bits of the SID.=C2=A0 L is called the locator=
 length and is<br>
&gt;&gt;&gt;&gt; flexible.=C2=A0 Each operator is free to use the locator l=
ength it<br>
&gt;&gt;&gt;&gt; chooses.=C2=A0 Most often the locator is routable and lead=
s to the node<br>
&gt;&gt;&gt;&gt; which instantiates that SID.=C2=A0 A control-plane protoco=
l might<br>
&gt;&gt;&gt;&gt; represent the locator as B:N where B is the SRv6 SID block=
 (IPv6<br>
&gt;&gt;&gt;&gt; subnet allocated for SRv6 SIDs by the operator) and N is t=
he<br>
&gt;&gt;&gt;&gt; identifier of the parent node.&quot;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&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=A0Ron<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt;&gt; From: Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.=
com" target=3D"_blank">hayabusagsm@gmail.com</a>&gt;<br>
&gt;&gt;&gt;&gt; Sent: Wednesday, October 9, 2019 7:21 PM<br>
&gt;&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" =
target=3D"_blank">rbonica@juniper.net</a>&gt;<br>
&gt;&gt;&gt;&gt; Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.=
com" target=3D"_blank">fgont@si6networks.com</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">s=
pring@ietf.org</a>&gt;<br>
&gt;&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-progr=
amming -<br>
&gt;&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; In-line comments<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Thanks<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Gyan<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Sent from my iPhone<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; On Oct 3, 2019, at 12:25 PM, Ron Bonica &lt;rbonica=3D=
<a href=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40juniper=
..net@dmarc.ietf.org</a>&gt; wrote:<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Fernando,<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Someone should. I think that the expertise to do this =
is in 6man.<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&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 Ron<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt;&gt;&gt; From: Fernando Gont &lt;<a href=3D"mailto:fgont@si6net=
works.com" target=3D"_blank">fgont@si6networks.com</a>&gt;<br>
&gt;&gt;&gt;&gt;&gt; Sent: Wednesday, October 2, 2019 3:11 PM<br>
&gt;&gt;&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.n=
et" target=3D"_blank">rbonica@juniper.net</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blan=
k">spring@ietf.org</a>&gt;<br>
&gt;&gt;&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-p=
rogramming -<br>
&gt;&gt;&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; On 1/10/19 23:30, Ron Bonica wrote:<br>
&gt;&gt;&gt;&gt;&gt;&gt; Authors,<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; The document should include a discussion of the re=
lationship<br>
&gt;&gt;&gt;&gt;&gt;&gt; between<br>
&gt;&gt;&gt;&gt;&gt;&gt; IPv6 addresses and SIDs. For example:<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; * From what address space can SIDs be drawn? Link =
local? Multicast? ULA?<br>
&gt;&gt;&gt;&gt;&gt;&gt; * Can a locator be longer than 64 bits? If so, how=
 can the rest of<br>
&gt;&gt;&gt;&gt;&gt;&gt; the<br>
&gt;&gt;&gt;&gt;&gt;&gt; /64 be used?<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; I&#39;m not saying that this shouldn&#39;t be done or =
that it is a bad idea,<br>
&gt;&gt;&gt;&gt;&gt; but I&#39;m curious if is anybody looking at this from=
 a higher level?<br>
&gt;&gt;&gt;&gt;&gt; (these seems pretty architectural to me)<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Thanks,<br>
&gt;&gt;&gt;&gt;&gt; --<br>
&gt;&gt;&gt;&gt;&gt; Fernando Gont<br>
&gt;&gt;&gt;&gt;&gt; SI6 Networks<br>
&gt;&gt;&gt;&gt;&gt; e-mail: <a href=3D"mailto:fgont@si6networks.com" targe=
t=3D"_blank">fgont@si6networks.com</a><br>
&gt;&gt;&gt;&gt;&gt; PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D=
55 1D4E 7492<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; [Gyan] The SRv6 SID format is below:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; So from an IPv6 data plane forwarding perspective the fixe=
d length 64 bit Locator is copied hop by hop into the destination address o=
f the IPv6 header to the tail end FEC destination egress PE and during fail=
over Ti-LFA kicks in additional EH is inserted
 {violating RFC 8200} at the PLR NNHOP to the similar to RLFA PQ node.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; So with SRV6 native traffic engineering the locator is eit=
her the physical IP on ingress interface along each hop or loopback along e=
ach hop and so is either a GUA or ULA but not LL or multicast address is wh=
at I understand from a technical standpoint.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;=C2=A0 From everything I have read the SID is fixed at 64 b=
it length maximum but I guess you can have a smaller then 64 bit locator.<b=
r>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; I am working on getting this setup in the lab now so that =
will really help understand the real world implementations.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; SRv6 SID format:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; 128-bits Segment IDs can be used and allocated for differe=
nt purposes, for example:<br>
&gt;&gt;&gt;&gt; =E2=80=A2 The first 64 bits can be used to direct traffic =
to a specific node<br>
&gt;&gt;&gt;&gt; in the network =E2=80=93 the =E2=80=9Cmain body=E2=80=9D o=
f the program =E2=80=A2 The next 32 bits<br>
&gt;&gt;&gt;&gt; can be used to enforce some actions on the traffic =E2=80=
=93 the<br>
&gt;&gt;&gt;&gt; =E2=80=9Cfunction=E2=80=9Dpart =E2=80=A2 The remaining 32 =
bits can be used to pass some<br>
&gt;&gt;&gt;&gt; additional information =E2=80=93 the =E2=80=9Cargument=E2=
=80=9D part 128-bit SRv6 SID<br>
&gt;&gt;&gt;&gt; Locator: routed to the node performing the function Functi=
on: any<br>
&gt;&gt;&gt;&gt; possible function Flexible bit-length selection<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; _______________________________________________<br>
&gt;&gt;&gt;&gt;&gt; spring mailing list<br>
&gt;&gt;&gt;&gt;&gt; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">s=
pring@ietf.org</a><br>
&gt;&gt;&gt;&gt;&gt; <a href=3D"https://urldefense.com/v3/__https:/www.ietf=
.org/mailman/listinfo/sp" target=3D"_blank">
https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/sp</a><br=
>
&gt;&gt;&gt;&gt;&gt; r<br>
&gt;&gt;&gt;&gt;&gt; i<br>
&gt;&gt;&gt;&gt;&gt; ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZG=
QRTz6hag6LoSzz<br>
&gt;&gt;&gt;&gt;&gt; 8<br>
&gt;&gt;&gt;&gt;&gt; K<br>
&gt;&gt;&gt;&gt;&gt; kBJW9qEVHARw$<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; _______________________________________________<br>
&gt;&gt;&gt; spring mailing list<br>
&gt;&gt;&gt; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ie=
tf.org</a><br>
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lman/listinfo/spri" target=3D"_blank">
https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spri</a><=
br>
&gt;&gt;&gt; ng__;!8WoA6RjC81c!Qg1ex-hXVBJKRryAR1Hl5x2o9By4PbwD0gDjfRxlvNtQ=
4zGljf0E<br>
&gt;&gt;&gt; omr2PHEsckWh$ _______________________________________________<=
br>
&gt;&gt;&gt; spring mailing list<br>
&gt;&gt;&gt; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ie=
tf.org</a><br>
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lman/listinfo/spri" target=3D"_blank">
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4zGljf0E<br>
&gt;&gt;&gt; omr2PHEsckWh$<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; spring mailing list<br>
&gt; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</=
a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/spring" target=3D"_bl=
ank">https://www.ietf.org/mailman/listinfo/spring</a><br>
&gt; <u></u><u></u></span></p>
</blockquote>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><br clear=3D"all">
<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-- <u></u><u></u></span></p>
<div>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">Gyan S. Mishra</span><span lang=3D"EN-US"><u><=
/u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">IT Network Engineering &amp; Technology=C2=A0<=
/span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">Verizon Communications=C2=A0Inc. (VZ)</span><s=
pan lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">13101 Columbia Pike FDC1 3rd Floor</span><span=
 lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">Silver Spring, MD 20904</span><span lang=3D"EN=
-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">United States</span><span lang=3D"EN-US"><u></=
u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"background-image:initial;background-positio=
n:initial;background-repeat:initial">
<span lang=3D"EN-US" style=3D"font-family:Calibri,sans-serif;color:rgb(80,0=
,80)">Phone:=C2=A0301 502-1347</span><span lang=3D"EN-US"><u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal" style=3D"background-image:initial;background-positio=
n:initial;background-repeat:initial">
<span lang=3D"EN-US" style=3D"font-family:Calibri,sans-serif;color:rgb(80,0=
,80)">Email:=C2=A0<a href=3D"mailto:gyan.s.mishra@verizon.com" target=3D"_b=
lank"><span style=3D"color:rgb(17,85,204)">gyan.s.mishra@verizon.com</span>=
</a></span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"background-image:initial;background-positio=
n:initial;background-repeat:initial">
<span lang=3D"EN-US" style=3D"font-family:&quot;Segoe UI&quot;,sans-serif;c=
olor:black;border:1pt none windowtext;padding:0cm"><a href=3D"http://www.li=
nkedin.com/in/networking-technologies-consultant" target=3D"_blank">www.lin=
kedin.com/in/networking-technologies-consultant</a></span><span lang=3D"EN-=
US"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><br clear=3D"all">
<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-- <u></u><u></u></span></p>
<div>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">Gyan S. Mishra</span><span lang=3D"EN-US"><u><=
/u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">IT Network Engineering &amp; Technology=C2=A0<=
/span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">Verizon Communications=C2=A0Inc. (VZ)</span><s=
pan lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">13101 Columbia Pike FDC1 3rd Floor</span><span=
 lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">Silver Spring, MD 20904</span><span lang=3D"EN=
-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:Calibri,sa=
ns-serif;color:rgb(80,0,80)">United States</span><span lang=3D"EN-US"><u></=
u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"background-image:initial;background-positio=
n:initial;background-repeat:initial">
<span lang=3D"EN-US" style=3D"font-family:Calibri,sans-serif;color:rgb(80,0=
,80)">Phone:=C2=A0301 502-1347</span><span lang=3D"EN-US"><u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal" style=3D"background-image:initial;background-positio=
n:initial;background-repeat:initial">
<span lang=3D"EN-US" style=3D"font-family:Calibri,sans-serif;color:rgb(80,0=
,80)">Email:=C2=A0<a href=3D"mailto:gyan.s.mishra@verizon.com" target=3D"_b=
lank"><span style=3D"color:rgb(17,85,204)">gyan.s.mishra@verizon.com</span>=
</a></span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"background-image:initial;background-positio=
n:initial;background-repeat:initial">
<span lang=3D"EN-US" style=3D"font-family:&quot;Segoe UI&quot;,sans-serif;c=
olor:black;border:1pt none windowtext;padding:0cm"><a href=3D"http://www.li=
nkedin.com/in/networking-technologies-consultant" target=3D"_blank">www.lin=
kedin.com/in/networking-technologies-consultant</a></span><span lang=3D"EN-=
US"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>

_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=
=3D"ltr"><div><p class=3D"MsoNormal"><span style=3D"font-family:Calibri,san=
s-serif;color:rgb(80,0,80);background-image:initial;background-position:ini=
tial;background-repeat:initial">Gyan S. Mishra</span><span style=3D"color:r=
gb(80,0,80);background-image:initial;background-position:initial;background=
-repeat:initial"><span></span></span></p><p class=3D"MsoNormal"><span style=
=3D"font-family:Calibri,sans-serif;color:rgb(80,0,80);background-image:init=
ial;background-position:initial;background-repeat:initial">IT Network Engin=
eering &amp;
Technology=C2=A0</span><span style=3D"color:rgb(80,0,80);background-image:i=
nitial;background-position:initial;background-repeat:initial"><span></span>=
</span></p><p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-s=
erif;color:rgb(80,0,80);background-image:initial;background-position:initia=
l;background-repeat:initial">Verizon
Communications=C2=A0Inc. (VZ)</span><span style=3D"color:rgb(80,0,80);backg=
round-image:initial;background-position:initial;background-repeat:initial">=
<span></span></span></p><p class=3D"MsoNormal"><span style=3D"font-family:C=
alibri,sans-serif;color:rgb(80,0,80);background-image:initial;background-po=
sition:initial;background-repeat:initial">13101 Columbia Pike FDC1 3rd
Floor</span><span style=3D"color:rgb(80,0,80);background-image:initial;back=
ground-position:initial;background-repeat:initial"><span></span></span></p>=
<p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-serif;color:=
rgb(80,0,80);background-image:initial;background-position:initial;backgroun=
d-repeat:initial">Silver Spring, MD 20904</span><span style=3D"color:rgb(80=
,0,80);background-image:initial;background-position:initial;background-repe=
at:initial"><span></span></span></p><p class=3D"MsoNormal"><span style=3D"f=
ont-family:Calibri,sans-serif;color:rgb(80,0,80);background-image:initial;b=
ackground-position:initial;background-repeat:initial">United States</span><=
span style=3D"color:rgb(80,0,80);background-image:initial;background-positi=
on:initial;background-repeat:initial"><span></span></span></p><p class=3D"M=
soNormal" style=3D"background-image:initial;background-position:initial;bac=
kground-repeat:initial"><span style=3D"font-family:Calibri,sans-serif;color=
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r:rgb(80,0,80)">Email:=C2=A0<a href=3D"mailto:gyan.s.mishra@verizon.com" ta=
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quot;Segoe UI&quot;,sans-serif;color:black;border:1pt none windowtext;paddi=
ng:0in;background-image:initial;background-position:initial;background-repe=
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From: Ron Bonica <rbonica@juniper.net>
To: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, Gyan Mishra <hayabusagsm@gmail.com>, "Joel M. Halpern" <jmh@joelhalpern.com>
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Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/i3TSFJ5QGOcNnLC-LeSde5XYg0w>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Addresses and SIDs
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--_000_BN7PR05MB569958ADB8E7BFF6C7EBC56AAE910BN7PR05MB5699namp_
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Folks,

I think that we need a global rule that says:

=1B$B!H=1B(BWith a /64, if one /128 represents an IPv6 interface, as descri=
bed in RFC 4291, all /128 MUST either:


  *   Represent an IPv6 interface, as described in RFC 4291, or
  *   Be unassigned=1B$B!I=1B(B

The 6man WG will need to make such a statement since it owns RFC 4291.

                                                             Ron




Juniper Business Use Only
From: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>
Sent: Friday, October 11, 2019 10:50 PM
To: Gyan Mishra <hayabusagsm@gmail.com>; Joel M. Halpern <jmh@joelhalpern.c=
om>; Ron Bonica <rbonica@juniper.net>
Cc: SPRING WG List <spring@ietf.org>
Subject: RE: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Add=
resses and SIDs

>From SRv6 deployment perspective, we should NOT change & impact existing me=
asure of allocating IPv6 address which are used for node=1B$B!G=1B(Bs IP in=
terfaces and basic IGP/BGP routing, such as IPv6 for loopback and physic in=
terfaces within Node, that is basic requirement for normal IPv6 networking =
operation. So SRv6 SIDs had better be another extra IPv6 block for its purp=
ose.
As far as I know, the IPv6 GUA block which is now being allocated is  that =
its most significant bits  is =1B$B!H=1B(B001=1B$B!I=1B(B, in further, this=
 block has defined as the fixed format =1B$B!H=1B(B64bits prefix + 64bits I=
ID=1B$B!I=1B(B in related RFCs, so I think the block May be not available f=
or SRv6 SID. so suggest the authors of NET-PGM draft should clarify it.

--------------------------------------
Cheers !


WANG Weibin

From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Gyan Mishra
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B12=1B$BF|=1B(B 0:52
To: Joel M. Halpern <jmh@joelhalpern.com<mailto:jmh@joelhalpern.com>>; Ron =
Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Cc: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 Add=
resses and SIDs


in-line comment

On Fri, Oct 11, 2019 at 12:38 PM Gyan Mishra <hayabusagsm@gmail.com<mailto:=
hayabusagsm@gmail.com>> wrote:

Sorry I should have read through the draft more carefully as its depicted c=
learly in an example in section 3. So the SIDs must be "routable" within th=
e SRv6 domain per the draft.

https://tools.ietf.org/pdf/draft-ietf-spring-srv6-network-programming-04.pd=
f<https://urldefense.com/v3/__https:/tools.ietf.org/pdf/draft-ietf-spring-s=
rv6-network-programming-04.pdf__;!8WoA6RjC81c!QHsO_aGu11-D9W5HO3bN9nILQCXi3=
2JwonAfblEnE26hCow8Pxh4Ht1X7kaFJ8iI$>

So the SID is definitely routable reachable and so must be GUI or ULA and c=
annot be a link local as it is rewriting the destination address with this =
address to route the packet POP a SID entry hop by hop to source route the =
packet to the egress node.  As far as the next hop it is still the traditio=
nal IGP OSPF or ISIS link local address which is programmed into the SID de=
stination FIB entry as the next hop.  Sorry was confusion on my part as I c=
onfused the next hop being overwritten like next hops in TE ERO where in th=
is case its the IPv6 data plane and the IPv6 header destination is being ov=
erwritten to the next hop by the SRH SID entry being popped hop by hop.

! Example
show ip route    2001:DB8:B:1:100: fe80::EUI64

So then I believe my statement is correct that the SID would be just ULA or=
 GUA and not multicast or link local.

  3. SRv6 SID As introduced in RFC8402 an SRv6 Segment Identifier is a 128-=
bit value. When an SRv6 SID is in the Destination Address field of an IPv6 =
header of a packet, it is routed through an IPv6 network as an IPv6 address=
. Its processing is defined in [I-D.ietf-6man-segment-routing-header] secti=
on 4.3 and reproduced here as a reminder. Without constraining the details =
of an implementation, the SR segment endpoint node creates Forwarding Infor=
mation Base (FIB) entries for its local SIDs. When an SRv6-capable node rec=
eives an IPv6 packet, it performs a longest-prefix-match lookup on the pack=
ets destination address. This lookup can return any of the following: - A F=
IB entry that represents a locally instantiated SRv6 SID - A FIB entry that=
 represents a local interface, not locally instantiated as an SRv6 SID - A =
FIB entry that represents a non-local route - No Match This document formal=
ly defines behaviors and parameters for SRv6 SIDs.

3.1. SID format An SRv6 SID is represented as LOC:FUNCT where LOC (locator)=
 is the L most significant bits and FUNCT (function) is the 128-L least sig=
nificant bits of the SID. L is called the locator length and is flexible. E=
ach operator is free to use the locator length it chooses. Most often the l=
ocator is routable and leads to the node which instantiates that SID. A con=
trol-plane protocol might represent the locator as B:N where B is the SRv6 =
SID block (IPv6 subnet allocated for SRv6 SIDs by the operator) and N is th=
e identifier of the parent node. The function part of the SID is an opaque =
identification of a local behavior bound to the SID. The FUNCT value zero i=
s invalid.
  The terminology "function" refers to the bit-string in the SRv6 SID. The =
terminology "behavior" identifies the pseudocode bound to the SID. The beha=
viors are defined in Section 4 of this document. A behavior may require add=
itional arguments that would be placed immediately after the FUNCT. In such=
 case, the SRv6 SID will have the form LOC:FUNCT:ARGS::. For this reason, t=
he SRv6 SIDs are matched on a per longest-prefix-match basis. ARG may conta=
in information related to the flow, service, or any other information requi=
red by FUNCT. The ARG value of a routed SID SHOULD remain constant among pa=
ckets in a given flow. Varying ARG values among packets in a flow may resul=
t in different ECMP hashing and cause re-ordering.

3.2. SID reachability Most often, the node N would advertise IPv6 prefix(es=
) matching the LOC parts covering its SIDs or shorter-mask prefix. The dist=
ribution of these advertisements and calculation of their reachability are =
routing protocol specific aspects that are outside the scope of this docume=
nt. An SRv6 SID is said to be routed if its SID belongs to an IPv6 prefix a=
dvertised via a routing protocol. An SRv6 SID that does not fulfill this co=
ndition is non-routed. Let=1B$B!G=1B(Bs provide a classic illustration: Nod=
e N is configured explicitly with two SIDs: 2001:DB8:B:1:100:: and 2001:DB8=
:B:2:101::. The network learns about a path to 2001:DB8:B:1::/64 via the IG=
P and hence a packet destined to 2001:DB8:B:1:100:: would be routed up to N=
. The network does not learn about a path to 2001:DB8:B:2::/64 via the IGP =
and hence a packet destined to 2001:DB8:B:2:101:: would not be routed up to=
 N. A packet could be steered to a non-routed SID 2001:DB8:B:2:101:: by usi=
ng a SID list <...,2001:DB8:B:1:100::,2001:DB8:B:2:101::,...> where the non=
-routed SID is preceded by a routed SID to the same node. Routed and non-ro=
uted SRv6 SIDs are the SRv6 instantiation of global and local segments, res=
pectively [RFC8402].

    [Gyan]  In section 3.1  I bolded " Each operator is free to use the loc=
ator length it chooses." So I guess the locator field is 64 bits but I gues=
s you could have a shorter locator field.
    So I guess what it sounds like  how this would work is imagine a SP cor=
e with many P routers hops along a path to an egress PE node and each P has=
 tons of /127s links meshed through the P core.

    I am trying to envision how the addressing plan would work for SRv6 SP =
core.

   So each P node in the core would have a /64 allocated to it which is in =
essence a "summary route"  that contains all the contiguous /127s that resi=
de on that P node and has a Loopback or virtual interface that has this /64=
 that is routable kind of like a BGP summary route and that is advertised i=
nto the IGP by every P router and every P router has this special /64 for S=
Rv6 routing that is used for the SRH SID list to build any to any SRv6 TE p=
aths.

So once you route hop by hop to that SID locator which is the /64 then as y=
ou land on each node you can do the PSSI and process the function/argument =
or what ever tasks need to be done hop by hop along the path to the egress =
PE FEC destination.

So now any ingress PE SRH would have in its RIB/FIB all the /64s for all th=
e loops that represent each P node in the core to build the SID list for th=
e traffic engineered path.

So now this /64 Locator is what the draft is stating can be any length mean=
ing shorter then /64 for either GUI or ULA implementations.



Gyan



On Fri, Oct 11, 2019 at 11:12 AM Joel M. Halpern <jmh@joelhalpern.com<mailt=
o:jmh@joelhalpern.com>> wrote:
If we need to see a running implementation to judge what the behavior is
supposed to be, it sounds like we could use clarifications of the
specification.

Yours,
Joel

On 10/11/2019 11:06 AM, Gyan Mishra wrote:
>
> Good point.  I think we need someone who has this in the lab or prod to s=
ee the exact implemented behavior.
>
> So since the URIB entry for the FEC destination egress PE prefix has the =
next hop for the IGP used for IPv6 set to the =1B$B!H=1B(Blink local next h=
op would the SID entry in the SID list be all link local addresses.
>
> So the SRH header SID list the SID entry=1B$B!G=1B(Bs provide the =1B$B!H=
=1B(Bnext hop=1B$B!I=1B(B to source route the traffic to the egress PE. So =
since normally the IGP next hop is a link local would all the SID entries b=
e link local and not GUA or ULA.
>
> So the destination in the IPv6 packet be traffic engineered would be the =
L3 vpn VRF destination and the FEC to forward to the egress PE that termina=
tes ibgp for vpnv4 vpnv6 is the loop /128 on the egress PE but to traffic e=
ngineer to get their the SID list would have all the next hops listed simil=
ar to a TE ERO explicit route object static LSP.
>
> Gyan
>
> Sent from my iPhone
>
>> On Oct 11, 2019, at 10:05 AM, Ron Bonica <rbonica@juniper.net<mailto:rbo=
nica@juniper.net>> wrote:
>>
>> Gyan,
>>
>> Why exclude link local for adjacency segments?
>>
>>                             Ron
>>
>>
>>
>> Juniper Business Use Only
>>
>> -----Original Message-----
>> From: Gyan Mishra <hayabusagsm@gmail.com<mailto:hayabusagsm@gmail.com>>
>> Sent: Thursday, October 10, 2019 12:34 PM
>> To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto=
:weibin.wang@nokia-sbell.com>>
>> Cc: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>; Fernan=
do Gont <fgont@si6networks.com<mailto:fgont@si6networks.com>>; SPRING WG Li=
st <spring@ietf.org<mailto:spring@ietf.org>>
>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming - IPv6 =
Addresses and SIDs
>>
>>
>>
>> Makes sense.  I think from Ron=1B$B!G=1B(Bs question is types address wh=
ich would have to be a GUA or ULA IPv6 URIB FIB routeable 128 bit prefix so=
 that would exclude multicast or link local since the prefix has to a unica=
st address and routable and reachable within the domain.
>>
>> Ron
>>
>> I can take this back to 6MAN WG with regards to SID address types and st=
ructure should be defined clearly as it is not today.  Agreed.
>>
>> Thanks
>>
>> Gyan
>>
>> Sent from my iPhone
>>
>>> On Oct 10, 2019, at 4:44 AM, Wang, Weibin (NSB - CN/Shanghai) <weibin..=
wang@nokia-sbell.com<mailto:weibin.wang@nokia-sbell.com>> wrote:
>>>
>>> The key character of SRv6 is the SRv6 SID has capability of routable fu=
nction, it is reachable according to FIBv6, so the SIDs, I think, must be a=
llocated from unicast IPv6 address space, because the SRv6 domain is limite=
d and controlled by operator, such as deploying it within it's AS domain, s=
o ULA as well GUA, I think, are also options for SRv6 SID; and the SID bloc=
k is separate from plain IPv6 address block which are usually configured un=
der Node's interfaces; so they are not overlap each other, but Both of them=
 must advertised by IGP or BGP protocol, they perform different function wi=
thin network; how to allocate the SID and how to indicate length of SID pre=
fix May be up to operator and its specific network scenario.
>>>
>>> --------------------------------------
>>> Cheers !
>>>
>>>
>>> WANG Weibin
>>>
>>> -----Original Message-----
>>> From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> =
On Behalf Of Gyan Mishra
>>> Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B10=1B$BF|=1B(B 10:58
>>> To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
>>> Cc: Fernando Gont <fgont@si6networks.com<mailto:fgont@si6networks.com>>=
; SPRING WG List
>>> <spring@ietf.org<mailto:spring@ietf.org>>
>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
>>> IPv6 Addresses and SIDs
>>>
>>>
>>> Hi Ron,
>>>
>>> I read that as well in my SRv6 studies so thinking about it logically f=
rom an IGP ospf or ISIS longest match routing IPv6 FIB entry perspective fo=
r me makes sense to understand the SRv6 IPv6 data plane.  So I think my int=
erpretation is that the 128 bit SID is broken up into hierarchy fields with=
 intelligence but from a routing perspective it=1B$B!G=1B(Bs an IPv6 addres=
s of a connected interface on a P or PE router which is a /127 for p2p link=
s however it defines your =1B$B!H=1B(Bnext hop=1B$B!I=1B(B NH or =1B$B!H=1B=
(Bnext next hop=1B$B!I=1B(B NNH in the legacy MPLS TE FRR node or path prot=
ection or IP-LFA/Remote LFA or you can think of it like a MPLS TE autoroute=
 or FA (forwarding adjacencies) and to use that path you have to static nex=
t hop to the tunnel but in this SRv6 case it=1B$B!G=1B(Bs a next hop IPv6 a=
ddress which is a full 128 bit address that is in the SID entry in the SID =
list as the next hop for your FEC destination in the IPv6 FIB entry.
>>>
>>> To make this easier for me to understand the SRv6 spec and how to inter=
pret lets think of an example of a service provider core with an IPv6 data =
plane path between ingress PE and egress and a egress FEC which is the loop=
back0 for your ibgp peering vpn services which is the IPv6 destination last=
 SID entry in the SID list which the one hop prior P would do it=1B$B!G=1B(=
Bs normal PSP similar to PHP in the mpls world.  So now imagine each P rout=
er along the path to the destination PE has a bunch of /127 p2p links.  So =
now the 1st SID entry would be to the next hop P from the originating PE th=
at inserted the EH routing type 4 header SRH to source route the traffic al=
ong the engineered path.  So now if you examine that 1st SID entry it is a =
128 bit address with embedded information such as the function and argument=
s in the station id so the actual IPv6 FIB entry for the egress PE FEC dest=
ination would have a next hop of the P router which is the SID what the 1st=
 SID contains which is a 128 bit address to route to the 1st node which is =
the next hop PE. Once the packet arrives at the 1st node in the case the in=
gress P the station id IID is decoded for any functions or argument the nee=
d to be executed by the instruction PSSI.
>>>
>>> That=1B$B!G=1B(Bs my interpretation but I have to build this out in the=
 lab do dig deeper into the bits and bytes.
>>>
>>> Cheers,
>>>
>>> Gyan
>>>
>>> Sent from my iPhone
>>>
>>>> On Oct 9, 2019, at 8:02 PM, Ron Bonica <rbonica@juniper.net<mailto:rbo=
nica@juniper.net>> wrote:
>>>>
>>>> Gyan,
>>>>
>>>> If the Locator were guaranteed to be 64 bits, as you suggest, there wo=
uld be no problem. However, the following text from Section 3.1 suggests ot=
herwise.
>>>>
>>>> "   An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is the=
 L
>>>> most significant bits and FUNCT (function) is the 128-L least
>>>> significant bits of the SID.  L is called the locator length and is
>>>> flexible.  Each operator is free to use the locator length it
>>>> chooses.  Most often the locator is routable and leads to the node
>>>> which instantiates that SID.  A control-plane protocol might
>>>> represent the locator as B:N where B is the SRv6 SID block (IPv6
>>>> subnet allocated for SRv6 SIDs by the operator) and N is the
>>>> identifier of the parent node."
>>>>
>>>>                                                                   Ron
>>>>
>>>>
>>>>
>>>> Juniper Business Use Only
>>>>
>>>> -----Original Message-----
>>>> From: Gyan Mishra <hayabusagsm@gmail.com<mailto:hayabusagsm@gmail.com>=
>
>>>> Sent: Wednesday, October 9, 2019 7:21 PM
>>>> To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
>>>> Cc: Fernando Gont <fgont@si6networks.com<mailto:fgont@si6networks.com>=
>; SPRING WG List
>>>> <spring@ietf.org<mailto:spring@ietf.org>>
>>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
>>>> IPv6 Addresses and SIDs
>>>>
>>>>
>>>>
>>>> In-line comments
>>>>
>>>> Thanks
>>>>
>>>> Gyan
>>>>
>>>> Sent from my iPhone
>>>>
>>>>> On Oct 3, 2019, at 12:25 PM, Ron Bonica <rbonica=3D40juniper..net@dma=
rc.ietf.org<mailto:40juniper.net@dmarc.ietf.org>> wrote:
>>>>>
>>>>> Fernando,
>>>>>
>>>>> Someone should. I think that the expertise to do this is in 6man.
>>>>>
>>>>>                                Ron
>>>>>
>>>>>
>>>>> Juniper Business Use Only
>>>>>
>>>>> -----Original Message-----
>>>>> From: Fernando Gont <fgont@si6networks.com<mailto:fgont@si6networks.c=
om>>
>>>>> Sent: Wednesday, October 2, 2019 3:11 PM
>>>>> To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>; SPR=
ING WG List
>>>>> <spring@ietf.org<mailto:spring@ietf.org>>
>>>>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -
>>>>> IPv6 Addresses and SIDs
>>>>>
>>>>>> On 1/10/19 23:30, Ron Bonica wrote:
>>>>>> Authors,
>>>>>>
>>>>>>
>>>>>>
>>>>>> The document should include a discussion of the relationship
>>>>>> between
>>>>>> IPv6 addresses and SIDs. For example:
>>>>>>
>>>>>>
>>>>>>
>>>>>> * From what address space can SIDs be drawn? Link local? Multicast? =
ULA?
>>>>>> * Can a locator be longer than 64 bits? If so, how can the rest of
>>>>>> the
>>>>>> /64 be used?
>>>>>
>>>>> I'm not saying that this shouldn't be done or that it is a bad idea,
>>>>> but I'm curious if is anybody looking at this from a higher level?
>>>>> (these seems pretty architectural to me)
>>>>>
>>>>> Thanks,
>>>>> --
>>>>> Fernando Gont
>>>>> SI6 Networks
>>>>> e-mail: fgont@si6networks.com<mailto:fgont@si6networks.com>
>>>>> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>>>>>
>>>>>
>>>>
>>>> [Gyan] The SRv6 SID format is below:
>>>>
>>>> So from an IPv6 data plane forwarding perspective the fixed length 64 =
bit Locator is copied hop by hop into the destination address of the IPv6 h=
eader to the tail end FEC destination egress PE and during failover Ti-LFA =
kicks in additional EH is inserted {violating RFC 8200} at the PLR NNHOP to=
 the similar to RLFA PQ node.
>>>>
>>>> So with SRV6 native traffic engineering the locator is either the phys=
ical IP on ingress interface along each hop or loopback along each hop and =
so is either a GUA or ULA but not LL or multicast address is what I underst=
and from a technical standpoint.
>>>>
>>>>  From everything I have read the SID is fixed at 64 bit length maximum=
 but I guess you can have a smaller then 64 bit locator.
>>>>
>>>> I am working on getting this setup in the lab now so that will really =
help understand the real world implementations.
>>>>
>>>> SRv6 SID format:
>>>>
>>>> 128-bits Segment IDs can be used and allocated for different purposes,=
 for example:
>>>> * The first 64 bits can be used to direct traffic to a specific node
>>>> in the network - the =1B$B!H=1B(Bmain body=1B$B!I=1B(B of the program =
* The next 32 bits
>>>> can be used to enforce some actions on the traffic - the
>>>> =1B$B!H=1B(Bfunction=1B$B!I=1B(Bpart * The remaining 32 bits can be us=
ed to pass some
>>>> additional information - the =1B$B!H=1B(Bargument=1B$B!I=1B(B part 128=
-bit SRv6 SID
>>>> Locator: routed to the node performing the function Function: any
>>>> possible function Flexible bit-length selection
>>>>
>>>>>
>>>>> _______________________________________________
>>>>> spring mailing list
>>>>> spring@ietf.org<mailto:spring@ietf.org>
>>>>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/sp<=
https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/sp>
>>>>> r
>>>>> i
>>>>> ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZGQRTz6hag6LoSzz
>>>>> 8
>>>>> K
>>>>> kBJW9qEVHARw$
>>>
>>> _______________________________________________
>>> spring mailing list
>>> spring@ietf.org<mailto:spring@ietf.org>
>>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spri<=
https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/spri>
>>> ng__;!8WoA6RjC81c!Qg1ex-hXVBJKRryAR1Hl5x2o9By4PbwD0gDjfRxlvNtQ4zGljf0E
>>> omr2PHEsckWh$ _______________________________________________
>>> spring mailing list
>>> spring@ietf.org<mailto:spring@ietf.org>
>>> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/spri<=
https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/spri>
>>> ng__;!8WoA6RjC81c!Qg1ex-hXVBJKRryAR1Hl5x2o9By4PbwD0gDjfRxlvNtQ4zGljf0E
>>> omr2PHEsckWh$
>
> _______________________________________________
> spring mailing list
> spring@ietf.org<mailto:spring@ietf.org>
> https://www.ietf.org/mailman/listinfo/spring<https://urldefense.com/v3/__=
https:/www.ietf.org/mailman/listinfo/spring__;!8WoA6RjC81c!QHsO_aGu11-D9W5H=
O3bN9nILQCXi32JwonAfblEnE26hCow8Pxh4Ht1X7hYjvwpW$>
>


--
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<mailto:gyan.s.mishra@verizon.com>
www.linkedin.com/in/networking-technologies-consultant<https://urldefense.c=
om/v3/__http:/www.linkedin.com/in/networking-technologies-consultant__;!8Wo=
A6RjC81c!QHsO_aGu11-D9W5HO3bN9nILQCXi32JwonAfblEnE26hCow8Pxh4Ht1X7o_4patq$>



--
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<mailto:gyan.s.mishra@verizon.com>
www.linkedin.com/in/networking-technologies-consultant<https://urldefense.c=
om/v3/__http:/www.linkedin.com/in/networking-technologies-consultant__;!8Wo=
A6RjC81c!QHsO_aGu11-D9W5HO3bN9nILQCXi32JwonAfblEnE26hCow8Pxh4Ht1X7o_4patq$>


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Folks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">I think that we need a global rule that says:<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=1B$B!H=1B(BWith a /64, if one /128 represents an I=
Pv6 interface, as described in RFC 4291, all /128 MUST either:<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l1 level1 =
lfo3"><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif">Represent an IPv6 interface, as described in RFC 4291, or<o:p></o:p>=
</span></li><li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-lis=
t:l1 level1 lfo3"><span style=3D"font-size:11.0pt;font-family:&quot;Calibri=
&quot;,sans-serif">Be unassigned=1B$B!I=1B(B<o:p></o:p></span></li></ul>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">The 6man WG will need to make such a statement sinc=
e it owns RFC 4291.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;MS PGothic&quot;,sa=
ns-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;font-family:&quot;Calibri&quot;,sans-serif;c=
olor:black">Juniper Business Use Only</span><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Wang, Weibin (NSB - CN/Shangha=
i) &lt;weibin.wang@nokia-sbell.com&gt;
<br>
<b>Sent:</b> Friday, October 11, 2019 10:50 PM<br>
<b>To:</b> Gyan Mishra &lt;hayabusagsm@gmail.com&gt;; Joel M. Halpern &lt;j=
mh@joelhalpern.com&gt;; Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Cc:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> RE: [spring] draft-ietf-spring-srv6-network-programming - I=
Pv6 Addresses and SIDs<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;mso-fareast-language:ZH-CN">From SRv6 deployment per=
spective, we should NOT change &amp; impact existing measure of allocating =
IPv6 address which are used for node=1B$B!G=1B(Bs IP interfaces
 and basic IGP/BGP routing, such as IPv6 for loopback and physic interfaces=
 within Node, that is basic requirement for normal IPv6 networking operatio=
n. So SRv6 SIDs had better be another extra IPv6 block for its purpose.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;mso-fareast-language:ZH-CN">As far as I know, the IP=
v6 GUA block which is now being allocated is &nbsp;that its most significan=
t bits &nbsp;is =1B$B!H=1B(B001=1B$B!I=1B(B, in further, this block has def=
ined
 as the fixed format =1B$B!H=1B(B64bits prefix &#43; 64bits IID=1B$B!I=1B(B=
 in related RFCs, so I think the block May be not available for SRv6 SID. s=
o suggest the authors of NET-PGM draft should clarify it.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,sans-=
serif;mso-fareast-language:ZH-CN">--------------------------------------<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif;mso-fareast-language:ZH-CN">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,sans-=
serif;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans=
-serif;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif;mso-fareast-language:ZH-CN">WANG Weibin&nbsp;
</span></b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roma=
n&quot;,serif;mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif;mso-fareast-language:ZH-CN">From:</span></b><span=
 style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-f=
areast-language:ZH-CN"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.or=
g">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Gyan Mishra<br>
<b>Sent:</b> 2019</span><span lang=3D"ZH-CN" style=3D"font-size:11.0pt;mso-=
fareast-language:ZH-CN">=1B$BG/=1B(B</span><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:ZH-CN">10</=
span><span lang=3D"ZH-CN" style=3D"font-size:11.0pt;mso-fareast-language:ZH=
-CN">=1B$B7n=1B(B</span><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;mso-fareast-language:ZH-CN">12</span><span lang=3D"=
ZH-CN" style=3D"font-size:11.0pt;mso-fareast-language:ZH-CN">=1B$BF|=1B(B</=
span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif;mso-fareast-language:ZH-CN">
 0:52<br>
<b>To:</b> Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com">jmh@j=
oelhalpern.com</a>&gt;; Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.ne=
t">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming - I=
Pv6 Addresses and SIDs<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">in-line c=
omment<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">On Fri, O=
ct 11, 2019 at 12:38 PM Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail=
.com">hayabusagsm@gmail.com</a>&gt; wrote:<o:p></o:p></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Sorry I s=
hould have read through the draft more carefully as its depicted clearly in=
 an example in section 3. So the SIDs must be &quot;routable&quot; within t=
he SRv6 domain per the draft.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><a href=
=3D"https://urldefense.com/v3/__https:/tools.ietf.org/pdf/draft-ietf-spring=
-srv6-network-programming-04.pdf__;!8WoA6RjC81c!QHsO_aGu11-D9W5HO3bN9nILQCX=
i32JwonAfblEnE26hCow8Pxh4Ht1X7kaFJ8iI$" target=3D"_blank">https://tools.iet=
f.org/pdf/draft-ietf-spring-srv6-network-programming-04.pdf</a>&nbsp;<o:p><=
/o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">So the SI=
D is definitely routable reachable and so must be GUI or ULA and cannot be =
a link local as it is rewriting the destination address with this address t=
o route the packet POP a SID entry hop
 by hop to source route the packet to the egress node.&nbsp; As far as the =
next hop it is still the traditional IGP OSPF or ISIS link local address wh=
ich is programmed into the SID destination FIB entry as the next hop.&nbsp;=
 Sorry was confusion on my part as I confused
 the next hop being overwritten like next hops in TE ERO where in this case=
 its the IPv6 data plane and the IPv6 header destination is being overwritt=
en to the next hop by the SRH SID entry being popped hop by hop.<o:p></o:p>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><br>
! Example<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">show ip r=
oute&nbsp; &nbsp; 2001:DB8:B:1:100: fe80::EUI64&nbsp;&nbsp;<o:p></o:p></spa=
n></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">So then I=
 believe my statement is correct that the SID would be just ULA or GUA and =
not multicast or link local.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&nbsp; 3.=
 SRv6 SID As introduced in RFC8402 an SRv6 Segment Identifier is a 128-bit =
value. When an SRv6 SID is in the Destination Address field of an IPv6 head=
er of a packet, it is routed through an IPv6
 network as an IPv6 address. Its processing is defined in [I-D.ietf-6man-se=
gment-routing-header] section 4.3 and reproduced here as a reminder. Withou=
t constraining the details of an implementation, the SR segment endpoint no=
de creates Forwarding Information
 Base (FIB) entries for its local SIDs. <span style=3D"color:red">When an S=
Rv6-capable node receives an IPv6 packet, it performs a longest-prefix-matc=
h lookup on the packets destination address.
</span>This lookup can return any of the following: - A FIB entry that repr=
esents a locally instantiated SRv6 SID - A FIB entry that represents a loca=
l interface, not locally instantiated as an SRv6 SID -
<span style=3D"color:red">A FIB entry that represents a non-local route </s=
pan>- No Match This document formally defines behaviors and parameters for =
SRv6 SIDs.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">3.1. SID =
format An SRv6 SID is represented as LOC:FUNCT where LOC (locator) is the L=
 most significant bits and FUNCT (function) is the 128-L least significant =
bits of the SID. L is called the locator
 length and is flexible. <b><span style=3D"color:red">Each operator is free=
 to use the locator length it chooses.</span></b><span style=3D"color:red">=
 Most often the locator is routable and leads to the node which instantiate=
s that SID. A control-plane protocol
 might represent the locator as B:N where B is the SRv6 SID block (IPv6 sub=
net allocated for SRv6 SIDs by the operator) and N is the identifier of the=
 parent node.</span> The function part of the SID is an opaque identificati=
on of a local behavior bound to
 the SID. The FUNCT value zero is invalid. &nbsp;&nbsp;<o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&nbsp; Th=
e terminology &quot;function&quot; refers to the bit-string in the SRv6 SID=
. The terminology &quot;behavior&quot; identifies the pseudocode bound to t=
he SID. The behaviors are defined in Section 4 of this document.
 A behavior may require additional arguments that would be placed immediate=
ly after the FUNCT. In such case, the SRv6 SID will have the form LOC:FUNCT=
:ARGS::. For this reason, the SRv6 SIDs are matched on a per longest-prefix=
-match basis. ARG may contain information
 related to the flow, service, or any other information required by FUNCT. =
The ARG value of a routed SID SHOULD remain constant among packets in a giv=
en flow. Varying ARG values among packets in a flow may result in different=
 ECMP hashing and cause re-ordering.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">3.2. <spa=
n style=3D"color:red">
SID reachability Most often, the node N would advertise IPv6 prefix(es) mat=
ching the LOC parts covering its SIDs or shorter-mask prefix.</span> The di=
stribution of these advertisements and calculation of their reachability ar=
e routing protocol specific aspects
 that are outside the scope of this document. <span style=3D"color:red">An =
SRv6 SID is said to be routed if its SID belongs to an IPv6 prefix advertis=
ed via a routing protocol.
<b>An SRv6 SID that does not fulfill this condition is non-routed.</b></spa=
n> Let<span lang=3D"ZH-CN">=1B$B!G=1B(B</span>s provide a classic illustrat=
ion: Node N is configured explicitly with two SIDs: 2001:DB8:B:1:100:: and =
2001:DB8:B:2:101::. The network learns about
 a path to 2001:DB8:B:1::/64 via the IGP and hence a packet destined to 200=
1:DB8:B:1:100:: would be routed up to N. The network does not learn about a=
 path to 2001:DB8:B:2::/64 via the IGP and hence a packet destined to 2001:=
DB8:B:2:101:: would not be routed
 up to N. <span style=3D"color:red">A packet could be steered to a non-rout=
ed SID 2001:DB8:B:2:101:: by using a SID list &lt;...,2001:DB8:B:1:100::,20=
01:DB8:B:2:101::,...&gt; where the non-routed SID is preceded by a routed S=
ID to the same node. Routed and non-routed
 SRv6 SIDs are the SRv6 instantiation of global and local segments, respect=
ively [RFC8402]. &nbsp;&nbsp;</span><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:=
p></o:p></span></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&nbsp; &n=
bsp; [Gyan]&nbsp; In section 3.1&nbsp; I bolded &quot; Each operator is fre=
e to use the locator length it chooses.&quot; So I guess the locator field =
is 64 bits but I guess you could have a shorter locator field.<o:p></o:p></=
span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&nbsp; &n=
bsp; So I guess what it sounds like&nbsp; how this would work is imagine a =
SP core with many P routers hops along a path to an egress PE node and each=
 P has tons of /127s links meshed through the P core.&nbsp;<o:p></o:p></spa=
n></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&nbsp; &n=
bsp; I am trying to envision how the addressing plan would work for SRv6 SP=
 core.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&nbsp; &n=
bsp;So each P node in the core would have a /64 allocated to it which is in=
 essence a &quot;summary route&quot;&nbsp; that contains all the contiguous=
 /127s that reside on that P node and has a Loopback or virtual
 interface that has this /64 that is routable kind of like a BGP summary ro=
ute and that is advertised into the IGP by every P router and every P route=
r has this special /64 for SRv6 routing that is used for the SRH SID list t=
o build any to any SRv6 TE paths.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">So once y=
ou route hop by hop to that SID locator which is the /64 then as you land o=
n each node you can do the PSSI and process the function/argument or what e=
ver tasks need to be done hop by hop
 along the path to the egress PE FEC destination.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">So now an=
y ingress PE SRH would have in its RIB/FIB all the /64s for all the loops t=
hat represent each P node in the core to build the SID list for the traffic=
 engineered path.&nbsp;&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">So now th=
is /64 Locator is what the draft is stating can be any length meaning short=
er then /64 for either GUI or ULA implementations.&nbsp;<o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Gyan<o:p>=
</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">On Fri, O=
ct 11, 2019 at 11:12 AM Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpe=
rn.com" target=3D"_blank">jmh@joelhalpern.com</a>&gt; wrote:<o:p></o:p></sp=
an></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">If we nee=
d to see a running implementation to judge what the behavior is
<br>
supposed to be, it sounds like we could use clarifications of the <br>
specification.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 10/11/2019 11:06 AM, Gyan Mishra wrote:<br>
&gt; <br>
&gt; Good point.&nbsp; I think we need someone who has this in the lab or p=
rod to see the exact implemented behavior.<br>
&gt; <br>
&gt; So since the URIB entry for the FEC destination egress PE prefix has t=
he next hop for the IGP used for IPv6 set to the
<span lang=3D"ZH-CN">=1B$B!H=1B(B</span>link local next hop would the SID e=
ntry in the SID list be all link local addresses.<br>
&gt; <br>
&gt; So the SRH header SID list the SID entry<span lang=3D"ZH-CN">=1B$B!G=
=1B(B</span>s provide the
<span lang=3D"ZH-CN">=1B$B!H=1B(B</span>next hop<span lang=3D"ZH-CN">=1B$B!=
I=1B(B</span> to source route the traffic to the egress PE. So since normal=
ly the IGP next hop is a link local would all the SID entries be link local=
 and not GUA or ULA.<br>
&gt; <br>
&gt; So the destination in the IPv6 packet be traffic engineered would be t=
he L3 vpn VRF destination and the FEC to forward to the egress PE that term=
inates ibgp for vpnv4 vpnv6 is the loop /128 on the egress PE but to traffi=
c engineer to get their the SID list
 would have all the next hops listed similar to a TE ERO explicit route obj=
ect static LSP.<br>
&gt; <br>
&gt; Gyan<br>
&gt; <br>
&gt; Sent from my iPhone<br>
&gt; <br>
&gt;&gt; On Oct 11, 2019, at 10:05 AM, Ron Bonica &lt;<a href=3D"mailto:rbo=
nica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt; wrote:<br>
&gt;&gt;<br>
&gt;&gt; Gyan,<br>
&gt;&gt;<br>
&gt;&gt; Why exclude link local for adjacency segments?<br>
&gt;&gt;<br>
&gt;&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbs=
p; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Ron<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;<br>
&gt;&gt; -----Original Message-----<br>
&gt;&gt; From: Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.com" tar=
get=3D"_blank">hayabusagsm@gmail.com</a>&gt;<br>
&gt;&gt; Sent: Thursday, October 10, 2019 12:34 PM<br>
&gt;&gt; To: Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.=
wang@nokia-sbell.com" target=3D"_blank">weibin.wang@nokia-sbell.com</a>&gt;=
<br>
&gt;&gt; Cc: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=
=3D"_blank">rbonica@juniper.net</a>&gt;; Fernando Gont &lt;<a href=3D"mailt=
o:fgont@si6networks.com" target=3D"_blank">fgont@si6networks.com</a>&gt;; S=
PRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spri=
ng@ietf.org</a>&gt;<br>
&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programming -=
 IPv6 Addresses and SIDs<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; Makes sense.&nbsp; I think from Ron<span lang=3D"ZH-CN">=1B$B!G=1B=
(B</span>s question is types address which would have to be a GUA or ULA IP=
v6 URIB FIB routeable 128 bit prefix so that would exclude multicast or lin=
k local since the prefix has to a unicast address and routable
 and reachable within the domain.<br>
&gt;&gt;<br>
&gt;&gt; Ron<br>
&gt;&gt;<br>
&gt;&gt; I can take this back to 6MAN WG with regards to SID address types =
and structure should be defined clearly as it is not today.&nbsp; Agreed.<b=
r>
&gt;&gt;<br>
&gt;&gt; Thanks<br>
&gt;&gt;<br>
&gt;&gt; Gyan<br>
&gt;&gt;<br>
&gt;&gt; Sent from my iPhone<br>
&gt;&gt;<br>
&gt;&gt;&gt; On Oct 10, 2019, at 4:44 AM, Wang, Weibin (NSB - CN/Shanghai) =
&lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com" target=3D"_blank">weibin=
..wang@nokia-sbell.com</a>&gt; wrote:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; The key character of SRv6 is the SRv6 SID has capability of ro=
utable function, it is reachable according to FIBv6, so the SIDs, I think, =
must be allocated from unicast IPv6 address space, because the SRv6 domain =
is limited and controlled by operator, such
 as deploying it within it's AS domain, so ULA as well GUA, I think, are al=
so options for SRv6 SID; and the SID block is separate from plain IPv6 addr=
ess block which are usually configured under Node's interfaces; so they are=
 not overlap each other, but Both
 of them must advertised by IGP or BGP protocol, they perform different fun=
ction within network; how to allocate the SID and how to indicate length of=
 SID prefix May be up to operator and its specific network scenario.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; --------------------------------------<br>
&gt;&gt;&gt; Cheers !<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; WANG Weibin<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt; From: spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" ta=
rget=3D"_blank">spring-bounces@ietf.org</a>&gt; On Behalf Of Gyan Mishra<br=
>
&gt;&gt;&gt; Sent: 2019<span lang=3D"ZH-CN">=1B$BG/=1B(B</span>10<span lang=
=3D"ZH-CN">=1B$B7n=1B(B</span>10<span lang=3D"ZH-CN">=1B$BF|=1B(B</span> 10=
:58<br>
&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" targ=
et=3D"_blank">rbonica@juniper.net</a>&gt;<br>
&gt;&gt;&gt; Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.com"=
 target=3D"_blank">fgont@si6networks.com</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">sprin=
g@ietf.org</a>&gt;<br>
&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-programmi=
ng -<br>
&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Hi Ron,<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; I read that as well in my SRv6 studies so thinking about it lo=
gically from an IGP ospf or ISIS longest match routing IPv6 FIB entry persp=
ective for me makes sense to understand the SRv6 IPv6 data plane.&nbsp; So =
I think my interpretation is that the 128 bit
 SID is broken up into hierarchy fields with intelligence but from a routin=
g perspective it<span lang=3D"ZH-CN">=1B$B!G=1B(B</span>s an IPv6 address o=
f a connected interface on a P or PE router which is a /127 for p2p links h=
owever it defines your
<span lang=3D"ZH-CN">=1B$B!H=1B(B</span>next hop<span lang=3D"ZH-CN">=1B$B!=
I=1B(B</span> NH or <span lang=3D"ZH-CN">
=1B$B!H=1B(B</span>next next hop<span lang=3D"ZH-CN">=1B$B!I=1B(B</span> NN=
H in the legacy MPLS TE FRR node or path protection or IP-LFA/Remote LFA or=
 you can think of it like a MPLS TE autoroute or FA (forwarding adjacencies=
) and to use that path you have to static next hop to the
 tunnel but in this SRv6 case it<span lang=3D"ZH-CN">=1B$B!G=1B(B</span>s a=
 next hop IPv6 address which is a full 128 bit address that is in the SID e=
ntry in the SID list as the next hop for your FEC destination in the IPv6 F=
IB entry.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; To make this easier for me to understand the SRv6 spec and how=
 to interpret lets think of an example of a service provider core with an I=
Pv6 data plane path between ingress PE and egress and a egress FEC which is=
 the loopback0 for your ibgp peering vpn
 services which is the IPv6 destination last SID entry in the SID list whic=
h the one hop prior P would do it<span lang=3D"ZH-CN">=1B$B!G=1B(B</span>s =
normal PSP similar to PHP in the mpls world.&nbsp; So now imagine each P ro=
uter along the path to the destination PE has a bunch
 of /127 p2p links.&nbsp; So now the 1st SID entry would be to the next hop=
 P from the originating PE that inserted the EH routing type 4 header SRH t=
o source route the traffic along the engineered path.&nbsp; So now if you e=
xamine that 1st SID entry it is a 128 bit
 address with embedded information such as the function and arguments in th=
e station id so the actual IPv6 FIB entry for the egress PE FEC destination=
 would have a next hop of the P router which is the SID what the 1st SID co=
ntains which is a 128 bit address
 to route to the 1st node which is the next hop PE. Once the packet arrives=
 at the 1st node in the case the ingress P the station id IID is decoded fo=
r any functions or argument the need to be executed by the instruction PSSI=
.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; That<span lang=3D"ZH-CN">=1B$B!G=1B(B</span>s my interpretatio=
n but I have to build this out in the lab do dig deeper into the bits and b=
ytes.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Cheers,<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Gyan<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Sent from my iPhone<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; On Oct 9, 2019, at 8:02 PM, Ron Bonica &lt;<a href=3D"mail=
to:rbonica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt; wrote=
:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Gyan,<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; If the Locator were guaranteed to be 64 bits, as you sugge=
st, there would be no problem. However, the following text from Section 3.1=
 suggests otherwise.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; &quot;&nbsp; &nbsp;An SRv6 SID is represented as LOC:FUNCT=
 where LOC (locator) is the L<br>
&gt;&gt;&gt;&gt; most significant bits and FUNCT (function) is the 128-L le=
ast<br>
&gt;&gt;&gt;&gt; significant bits of the SID.&nbsp; L is called the locator=
 length and is<br>
&gt;&gt;&gt;&gt; flexible.&nbsp; Each operator is free to use the locator l=
ength it<br>
&gt;&gt;&gt;&gt; chooses.&nbsp; Most often the locator is routable and lead=
s to the node<br>
&gt;&gt;&gt;&gt; which instantiates that SID.&nbsp; A control-plane protoco=
l might<br>
&gt;&gt;&gt;&gt; represent the locator as B:N where B is the SRv6 SID block=
 (IPv6<br>
&gt;&gt;&gt;&gt; subnet allocated for SRv6 SIDs by the operator) and N is t=
he<br>
&gt;&gt;&gt;&gt; identifier of the parent node.&quot;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nb=
sp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp; &nbsp; &nbsp; &nbsp;Ron<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt;&gt; From: Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.=
com" target=3D"_blank">hayabusagsm@gmail.com</a>&gt;<br>
&gt;&gt;&gt;&gt; Sent: Wednesday, October 9, 2019 7:21 PM<br>
&gt;&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" =
target=3D"_blank">rbonica@juniper.net</a>&gt;<br>
&gt;&gt;&gt;&gt; Cc: Fernando Gont &lt;<a href=3D"mailto:fgont@si6networks.=
com" target=3D"_blank">fgont@si6networks.com</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">s=
pring@ietf.org</a>&gt;<br>
&gt;&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-progr=
amming -<br>
&gt;&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; In-line comments<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Thanks<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Gyan<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; Sent from my iPhone<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; On Oct 3, 2019, at 12:25 PM, Ron Bonica &lt;rbonica=3D=
<a href=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40juniper=
..net@dmarc.ietf.org</a>&gt; wrote:<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Fernando,<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Someone should. I think that the expertise to do this =
is in 6man.<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Ron<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Juniper Business Use Only<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; -----Original Message-----<br>
&gt;&gt;&gt;&gt;&gt; From: Fernando Gont &lt;<a href=3D"mailto:fgont@si6net=
works.com" target=3D"_blank">fgont@si6networks.com</a>&gt;<br>
&gt;&gt;&gt;&gt;&gt; Sent: Wednesday, October 2, 2019 3:11 PM<br>
&gt;&gt;&gt;&gt;&gt; To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.n=
et" target=3D"_blank">rbonica@juniper.net</a>&gt;; SPRING WG List<br>
&gt;&gt;&gt;&gt;&gt; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blan=
k">spring@ietf.org</a>&gt;<br>
&gt;&gt;&gt;&gt;&gt; Subject: Re: [spring] draft-ietf-spring-srv6-network-p=
rogramming -<br>
&gt;&gt;&gt;&gt;&gt; IPv6 Addresses and SIDs<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; On 1/10/19 23:30, Ron Bonica wrote:<br>
&gt;&gt;&gt;&gt;&gt;&gt; Authors,<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; The document should include a discussion of the re=
lationship<br>
&gt;&gt;&gt;&gt;&gt;&gt; between<br>
&gt;&gt;&gt;&gt;&gt;&gt; IPv6 addresses and SIDs. For example:<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;&gt; * From what address space can SIDs be drawn? Link =
local? Multicast? ULA?<br>
&gt;&gt;&gt;&gt;&gt;&gt; * Can a locator be longer than 64 bits? If so, how=
 can the rest of<br>
&gt;&gt;&gt;&gt;&gt;&gt; the<br>
&gt;&gt;&gt;&gt;&gt;&gt; /64 be used?<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; I'm not saying that this shouldn't be done or that it =
is a bad idea,<br>
&gt;&gt;&gt;&gt;&gt; but I'm curious if is anybody looking at this from a h=
igher level?<br>
&gt;&gt;&gt;&gt;&gt; (these seems pretty architectural to me)<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; Thanks,<br>
&gt;&gt;&gt;&gt;&gt; --<br>
&gt;&gt;&gt;&gt;&gt; Fernando Gont<br>
&gt;&gt;&gt;&gt;&gt; SI6 Networks<br>
&gt;&gt;&gt;&gt;&gt; e-mail: <a href=3D"mailto:fgont@si6networks.com" targe=
t=3D"_blank">fgont@si6networks.com</a><br>
&gt;&gt;&gt;&gt;&gt; PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D=
55 1D4E 7492<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; [Gyan] The SRv6 SID format is below:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; So from an IPv6 data plane forwarding perspective the fixe=
d length 64 bit Locator is copied hop by hop into the destination address o=
f the IPv6 header to the tail end FEC destination egress PE and during fail=
over Ti-LFA kicks in additional EH is inserted
 {violating RFC 8200} at the PLR NNHOP to the similar to RLFA PQ node.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; So with SRV6 native traffic engineering the locator is eit=
her the physical IP on ingress interface along each hop or loopback along e=
ach hop and so is either a GUA or ULA but not LL or multicast address is wh=
at I understand from a technical standpoint.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&nbsp; From everything I have read the SID is fixed at 64 b=
it length maximum but I guess you can have a smaller then 64 bit locator.<b=
r>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; I am working on getting this setup in the lab now so that =
will really help understand the real world implementations.<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; SRv6 SID format:<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt; 128-bits Segment IDs can be used and allocated for differe=
nt purposes, for example:<br>
&gt;&gt;&gt;&gt; <span lang=3D"ZH-CN">&#8226;</span> The first 64 bits can =
be used to direct traffic to a specific node<br>
&gt;&gt;&gt;&gt; in the network <span lang=3D"ZH-CN">&#8211;</span> the <sp=
an lang=3D"ZH-CN">=1B$B!H=1B(B</span>main body<span lang=3D"ZH-CN">=1B$B!I=
=1B(B</span> of the program
<span lang=3D"ZH-CN">&#8226;</span> The next 32 bits<br>
&gt;&gt;&gt;&gt; can be used to enforce some actions on the traffic <span l=
ang=3D"ZH-CN">&#8211;</span> the<br>
&gt;&gt;&gt;&gt; <span lang=3D"ZH-CN">=1B$B!H=1B(B</span>function<span lang=
=3D"ZH-CN">=1B$B!I=1B(B</span>part <span lang=3D"ZH-CN">
&#8226;</span> The remaining 32 bits can be used to pass some<br>
&gt;&gt;&gt;&gt; additional information <span lang=3D"ZH-CN">&#8211;</span>=
 the <span lang=3D"ZH-CN">=1B$B!H=1B(B</span>argument<span lang=3D"ZH-CN">=
=1B$B!I=1B(B</span> part 128-bit SRv6 SID<br>
&gt;&gt;&gt;&gt; Locator: routed to the node performing the function Functi=
on: any<br>
&gt;&gt;&gt;&gt; possible function Flexible bit-length selection<br>
&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt;<br>
&gt;&gt;&gt;&gt;&gt; _______________________________________________<br>
&gt;&gt;&gt;&gt;&gt; spring mailing list<br>
&gt;&gt;&gt;&gt;&gt; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">s=
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https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/sp</a><br=
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&gt;&gt;&gt;&gt;&gt; ng__;!8WoA6RjC81c!UP3yJRwYfx17fPimClpX4-wcZU8JT55LIEZG=
QRTz6hag6LoSzz<br>
&gt;&gt;&gt;&gt;&gt; 8<br>
&gt;&gt;&gt;&gt;&gt; K<br>
&gt;&gt;&gt;&gt;&gt; kBJW9qEVHARw$<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; _______________________________________________<br>
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&gt;&gt;&gt; omr2PHEsckWh$ _______________________________________________<=
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https://www.ietf.org/mailman/listinfo/spring</a><br>
&gt; <o:p></o:p></span></p>
</blockquote>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><br clear=
=3D"all">
<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">-- <o:p><=
/o:p></span></p>
<div>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">Gyan S. Mishra</span><span style=3D"mso-f=
areast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">IT Network Engineering &amp; Technology&n=
bsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">Verizon Communications&nbsp;Inc. (VZ)</sp=
an><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">13101 Columbia Pike FDC1 3rd Floor</span>=
<span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">Silver Spring, MD 20904</span><span style=
=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">United States</span><span style=3D"mso-fa=
reast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;background-image:initial;background-position:initial;background-rep=
eat:initial">
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#500050;mso=
-fareast-language:ZH-CN">Phone:&nbsp;301 502-1347</span><span style=3D"mso-=
fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;background-image:initial;background-position:initial;background-rep=
eat:initial">
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#500050;mso=
-fareast-language:ZH-CN">Email:&nbsp;<a href=3D"mailto:gyan.s.mishra@verizo=
n.com" target=3D"_blank"><span style=3D"color:#1155CC">gyan.s.mishra@verizo=
n.com</span></a></span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;background-image:initial;background-position:initial;background-rep=
eat:initial">
<span style=3D"font-family:&quot;Segoe UI&quot;,sans-serif;color:black;bord=
er:none windowtext 1.0pt;padding:0in;mso-fareast-language:ZH-CN"><a href=3D=
"https://urldefense.com/v3/__http:/www.linkedin.com/in/networking-technolog=
ies-consultant__;!8WoA6RjC81c!QHsO_aGu11-D9W5HO3bN9nILQCXi32JwonAfblEnE26hC=
ow8Pxh4Ht1X7o_4patq$" target=3D"_blank">www.linkedin.com/in/networking-tech=
nologies-consultant</a></span><span style=3D"mso-fareast-language:ZH-CN"><o=
:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><br clear=
=3D"all">
<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">-- <o:p><=
/o:p></span></p>
<div>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">Gyan S. Mishra</span><span style=3D"mso-f=
areast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">IT Network Engineering &amp; Technology&n=
bsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">Verizon Communications&nbsp;Inc. (VZ)</sp=
an><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">13101 Columbia Pike FDC1 3rd Floor</span>=
<span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">Silver Spring, MD 20904</span><span style=
=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#5=
00050;mso-fareast-language:ZH-CN">United States</span><span style=3D"mso-fa=
reast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;background-image:initial;background-position:initial;background-rep=
eat:initial">
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#500050;mso=
-fareast-language:ZH-CN">Phone:&nbsp;301 502-1347</span><span style=3D"mso-=
fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;background-image:initial;background-position:initial;background-rep=
eat:initial">
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#500050;mso=
-fareast-language:ZH-CN">Email:&nbsp;<a href=3D"mailto:gyan.s.mishra@verizo=
n.com" target=3D"_blank"><span style=3D"color:#1155CC">gyan.s.mishra@verizo=
n.com</span></a></span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;background-image:initial;background-position:initial;background-rep=
eat:initial">
<span style=3D"font-family:&quot;Segoe UI&quot;,sans-serif;color:black;bord=
er:none windowtext 1.0pt;padding:0in;mso-fareast-language:ZH-CN"><a href=3D=
"https://urldefense.com/v3/__http:/www.linkedin.com/in/networking-technolog=
ies-consultant__;!8WoA6RjC81c!QHsO_aGu11-D9W5HO3bN9nILQCXi32JwonAfblEnE26hC=
ow8Pxh4Ht1X7o_4patq$" target=3D"_blank">www.linkedin.com/in/networking-tech=
nologies-consultant</a></span><span style=3D"mso-fareast-language:ZH-CN"><o=
:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
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From: Robert Raszuk <robert@raszuk.net>
Date: Sun, 13 Oct 2019 23:24:06 +0200
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To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>
Cc: SPRING WG List <spring@ietf.org>
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Hi Ron,

I disagree.

Your suggestion violates longest prefix match principle in routing.

It is huge waist of address space and is not specific to IPv6 at all.

Let me describe the deployment case where your suggestion would cause it to
break:

I have /64 prefix where a few  /128s from that space I allocate to local
interfaces making it a local v6 destinations on those nodes.

However in the spirit of CIDR I still want to to use some blocks of that
space - say  /126 or /124 as blocks which I only use to trigger local NAT
as per rfc6296. And NAT does not require local address to be a destination
address so it would be a big disservice to kill such deployment option.

Many thx,
R.


On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D
40juniper.net@dmarc.ietf.org> wrote:

> Folks,
>
>
>
> I think that we need a global rule that says:
>
>
>
> =E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as describ=
ed in RFC
> 4291, all /128 MUST either:
>
>
>
>    - Represent an IPv6 interface, as described in RFC 4291, or
>    - Be unassigned=E2=80=9D
>
>
>
> The 6man WG will need to make such a statement since it owns RFC 4291.
>
>
>
>                                                              Ron
>

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<div dir=3D"ltr"><div>Hi Ron,</div><div><br></div><div>I disagree.=C2=A0</d=
iv><div><br></div><div>Your suggestion violates=C2=A0longest prefix match p=
rinciple in routing.=C2=A0</div><div><br></div><div>It is huge waist of add=
ress space and is not specific to IPv6 at all.=C2=A0</div><div><br></div><d=
iv>Let me describe the deployment case where your suggestion=C2=A0would cau=
se it to break:=C2=A0</div><div><br></div><div>I have /64 prefix where a fe=
w=C2=A0 /128s from that space I allocate to local interfaces making it a lo=
cal v6 destinations on those nodes.=C2=A0</div><div><br></div><div>However =
in the spirit of CIDR I still want to to use some blocks of that space - sa=
y=C2=A0 /126 or /124 as blocks which I only use to trigger local NAT as per=
=C2=A0rfc6296. And NAT does not require local address to be a destination a=
ddress so it would be a big disservice to kill such deployment option.=C2=
=A0</div><div dir=3D"ltr"><br></div><div>Many thx,<br>R.</div><div dir=3D"l=
tr"><br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmai=
l_attr">On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica &lt;rbonica=3D<a href=
=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40juniper.net@dm=
arc.ietf.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">Folks,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">I think that we need a global rule that says:<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">=E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as=
 described in RFC 4291, all /128 MUST either:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li style=3D"margin-left:0in"><span style=3D"font-size:11pt;font-family:Cal=
ibri,sans-serif">Represent an IPv6 interface, as described in RFC 4291, or<=
u></u><u></u></span></li><li style=3D"margin-left:0in"><span style=3D"font-=
size:11pt;font-family:Calibri,sans-serif">Be unassigned=E2=80=9D<u></u><u><=
/u></span></li></ul>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">The 6man WG will need to make such a statement since it owns RFC =
4291.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0Ron</span></p></div></div></blockquote></div></div>

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From: Mark Smith <markzzzsmith@gmail.com>
Date: Mon, 14 Oct 2019 08:45:57 +1100
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To: Robert Raszuk <robert@raszuk.net>
Cc: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, SPRING WG <spring@ietf.org>
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On Mon, 14 Oct 2019, 08:24 Robert Raszuk, <robert@raszuk.net> wrote:

> Hi Ron,
>
> I disagree.
>
> Your suggestion violates longest prefix match principle in routing.
>
> It is huge waist of address space and is not specific to IPv6 at all.
>
> Let me describe the deployment case where your suggestion would cause it
> to break:
>
> I have /64 prefix where a few  /128s from that space I allocate to local
> interfaces making it a local v6 destinations on those nodes.
>
> However in the spirit of CIDR I still want to to use some blocks of that
> space - say  /126 or /124 as blocks which I only use to trigger local NAT
> as per rfc6296.
>

Realise that RFC6296 is Experimental, and therefore nothing standard track
can rely on it.

Don't use NAT. IPv6 is pointless if you do.

RFC2993 - Architectural Implications of NAT
*https://tools.ietf.org/html/rfc2993 <https://tools.ietf.org/html/rfc2993>*


The Touble with NAT - APNIC blog articles

https://blog.apnic.net/2016/10/25/trouble-nat-part-1/

https://blog.apnic.net/2016/10/26/trouble-nat-part-2/

https://blog.apnic.net/2016/10/27/trouble-nat-part-3/


And NAT does not require local address to be a destination address so it
> would be a big disservice to kill such deployment option.
>
> Many thx,
> R.
>
>
> On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D
> 40juniper.net@dmarc.ietf.org> wrote:
>
>> Folks,
>>
>>
>>
>> I think that we need a global rule that says:
>>
>>
>>
>> =E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as descri=
bed in
>> RFC 4291, all /128 MUST either:
>>
>>
>>
>>    - Represent an IPv6 interface, as described in RFC 4291, or
>>    - Be unassigned=E2=80=9D
>>
>>
>>
>> The 6man WG will need to make such a statement since it owns RFC 4291.
>>
>>
>>
>>                                                              Ron
>>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>

--000000000000d14c8a0594d1adf7
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto"><div><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Mon, 14 Oct 2019, 08:24 Robert Raszuk, &lt;<a href=
=3D"mailto:robert@raszuk.net" rel=3D"noreferrer noreferrer noreferrer noref=
errer noreferrer noreferrer noreferrer" target=3D"_blank">robert@raszuk.net=
</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><d=
iv>Hi Ron,</div><div><br></div><div>I disagree.=C2=A0</div><div><br></div><=
div>Your suggestion violates=C2=A0longest prefix match principle in routing=
.=C2=A0</div><div><br></div><div>It is huge waist of address space and is n=
ot specific to IPv6 at all.=C2=A0</div><div><br></div><div>Let me describe =
the deployment case where your suggestion=C2=A0would cause it to break:=C2=
=A0</div><div><br></div><div>I have /64 prefix where a few=C2=A0 /128s from=
 that space I allocate to local interfaces making it a local v6 destination=
s on those nodes.=C2=A0</div><div><br></div><div>However in the spirit of C=
IDR I still want to to use some blocks of that space - say=C2=A0 /126 or /1=
24 as blocks which I only use to trigger local NAT as per=C2=A0rfc6296. </d=
iv></div></blockquote></div></div><div dir=3D"auto"><br></div><div dir=3D"a=
uto">Realise that RFC6296 is Experimental, and therefore nothing standard t=
rack can rely on it.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Don=
&#39;t use NAT. IPv6 is pointless if you do.</div><div dir=3D"auto"><br></d=
iv><div dir=3D"auto">RFC2993 -=C2=A0<span style=3D"font-size:1em;font-weigh=
t:bold">Architectural Implications of NAT</span></div><div dir=3D"auto"><b>=
<a href=3D"https://tools.ietf.org/html/rfc2993" rel=3D"noreferrer noreferre=
r noreferrer noreferrer" target=3D"_blank">https://tools.ietf.org/html/rfc2=
993</a></b><br></div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></di=
v><div dir=3D"auto">The Touble with NAT - APNIC blog articles</div><div dir=
=3D"auto"><br></div><div dir=3D"auto"><a href=3D"https://blog.apnic.net/201=
6/10/25/trouble-nat-part-1/" rel=3D"noreferrer noreferrer" target=3D"_blank=
">https://blog.apnic.net/2016/10/25/trouble-nat-part-1/</a><br></div><div d=
ir=3D"auto"><br></div><div dir=3D"auto"><a href=3D"https://blog.apnic.net/2=
016/10/26/trouble-nat-part-2/" target=3D"_blank" rel=3D"noreferrer">https:/=
/blog.apnic.net/2016/10/26/trouble-nat-part-2/</a><br></div><div dir=3D"aut=
o"><br></div><div dir=3D"auto"><a href=3D"https://blog.apnic.net/2016/10/27=
/trouble-nat-part-3/">https://blog.apnic.net/2016/10/27/trouble-nat-part-3/=
</a><br></div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></div><div =
dir=3D"auto"><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div=
 dir=3D"ltr"><div>And NAT does not require local address to be a destinatio=
n address so it would be a big disservice to kill such deployment option.=
=C2=A0</div><div dir=3D"ltr"><br></div><div>Many thx,<br>R.</div><div dir=
=3D"ltr"><br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D=
"gmail_attr">On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica &lt;rbonica=3D<a h=
ref=3D"mailto:40juniper.net@dmarc.ietf.org" rel=3D"noreferrer noreferrer no=
referrer noreferrer noreferrer noreferrer noreferrer noreferrer" target=3D"=
_blank">40juniper.net@dmarc.ietf.org</a>&gt; wrote:<br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
 rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">Folks,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">I think that we need a global rule that says:<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">=E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as=
 described in RFC 4291, all /128 MUST either:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li style=3D"margin-left:0in"><span style=3D"font-size:11pt;font-family:Cal=
ibri,sans-serif">Represent an IPv6 interface, as described in RFC 4291, or<=
u></u><u></u></span></li><li style=3D"margin-left:0in"><span style=3D"font-=
size:11pt;font-family:Calibri,sans-serif">Be unassigned=E2=80=9D<u></u><u><=
/u></span></li></ul>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">The 6man WG will need to make such a statement since it owns RFC =
4291.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0Ron</span></p></div></div></blockquote></div></div>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" rel=3D"noreferrer noreferrer noreferrer =
noreferrer noreferrer noreferrer noreferrer noreferrer" target=3D"_blank">s=
pring@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer =
noreferrer noreferrer noreferrer noreferrer noreferrer noreferrer noreferre=
r noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/sprin=
g</a><br>
</blockquote></div></div></div>

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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 14 Oct 2019 00:06:54 +0200
Message-ID: <CAOj+MMFQh1EgSLdxafmdEjRp+JZ40G0LDNAaSOJhiQ6Nik4avA@mail.gmail.com>
To: Mark Smith <markzzzsmith@gmail.com>
Cc: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, SPRING WG <spring@ietf.org>
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Subject: Re: [spring] IPv6 Addresses and SIDs
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Hi Mark,

I am in complete agreement with you that NAT is evil and should be avoided
**.

However let me explain my use case of NAT. It is described in section 7
of draft-raszuk-teas-ip-te-np-00 only uses destination address mapping
without requirement that the destination is a local interface on a mid
point TE node:

   As an alternative solution to avoid unnecessary processing of
   extension header by nodes which are not required to do so
   implementation can treat SID with last four bits set to zero as none
   local destination address.  In such scenario source+destination
   lookup will instead of triggering local extension header processing
   invoke destination IPv6 NAT function as defined in [RFC6296
<https://tools.ietf.org/html/rfc6296>].  The
   NAT rules which will be pre-programmed using information contained in

   the PATH_LIST will effectively result in destination address swap.
   Such NAT translation is to be of unidirectional character can can
   remain fully stateless.


The way I read Ron's suggestion - it would result in huge address space
waist for no reason. That's all.

Many thx,
Robert.

PS.
** As side comment let me share that some of my observations lead me to
believe that the biggest obstacle of IPv6 deployment in a lot of
enterprises is the notion of end to end IPv6 transparency. But this is
different topic and different thread.


On Sun, Oct 13, 2019 at 11:46 PM Mark Smith <markzzzsmith@gmail.com> wrote:

>
>
> On Mon, 14 Oct 2019, 08:24 Robert Raszuk, <robert@raszuk.net> wrote:
>
>> Hi Ron,
>>
>> I disagree.
>>
>> Your suggestion violates longest prefix match principle in routing.
>>
>> It is huge waist of address space and is not specific to IPv6 at all.
>>
>> Let me describe the deployment case where your suggestion would cause it
>> to break:
>>
>> I have /64 prefix where a few  /128s from that space I allocate to local
>> interfaces making it a local v6 destinations on those nodes.
>>
>> However in the spirit of CIDR I still want to to use some blocks of that
>> space - say  /126 or /124 as blocks which I only use to trigger local NA=
T
>> as per rfc6296.
>>
>
> Realise that RFC6296 is Experimental, and therefore nothing standard trac=
k
> can rely on it.
>
> Don't use NAT. IPv6 is pointless if you do.
>
> RFC2993 - Architectural Implications of NAT
> *https://tools.ietf.org/html/rfc2993 <https://tools.ietf.org/html/rfc2993=
>*
>
>
> The Touble with NAT - APNIC blog articles
>
> https://blog.apnic.net/2016/10/25/trouble-nat-part-1/
>
> https://blog.apnic.net/2016/10/26/trouble-nat-part-2/
>
> https://blog.apnic.net/2016/10/27/trouble-nat-part-3/
>
>
> And NAT does not require local address to be a destination address so it
>> would be a big disservice to kill such deployment option.
>>
>> Many thx,
>> R.
>>
>>
>> On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D
>> 40juniper.net@dmarc.ietf.org> wrote:
>>
>>> Folks,
>>>
>>>
>>>
>>> I think that we need a global rule that says:
>>>
>>>
>>>
>>> =E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as descr=
ibed in
>>> RFC 4291, all /128 MUST either:
>>>
>>>
>>>
>>>    - Represent an IPv6 interface, as described in RFC 4291, or
>>>    - Be unassigned=E2=80=9D
>>>
>>>
>>>
>>> The 6man WG will need to make such a statement since it owns RFC 4291.
>>>
>>>
>>>
>>>                                                              Ron
>>>
>> _______________________________________________
>> spring mailing list
>> spring@ietf.org
>> https://www.ietf.org/mailman/listinfo/spring
>>
>

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<div dir=3D"ltr"><div dir=3D"ltr">Hi Mark,<br></div><div dir=3D"ltr"><div><=
br></div><div>I am in complete agreement with you that NAT is evil and shou=
ld be avoided **. </div><div><br></div><div>However let me explain my use c=
ase of NAT. It is described in section 7 of=C2=A0draft-raszuk-teas-ip-te-np=
-00 only uses destination address mapping without requirement that the dest=
ination is a local interface on a mid point TE node:=C2=A0</div><div><br></=
div><div><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px=
;break-before:page;color:rgb(0,0,0)">   As an alternative solution to avoid=
 unnecessary processing of
   extension header by nodes which are not required to do so
   implementation can treat SID with last four bits set to zero as none
   local destination address.  In such scenario source+destination
   lookup will instead of triggering local extension header processing
   invoke destination IPv6 NAT function as defined in [<a href=3D"https://t=
ools.ietf.org/html/rfc6296" title=3D"&quot;IPv6-to-IPv6 Network Prefix Tran=
slation&quot;" target=3D"_blank">RFC6296</a>].  The
   NAT rules which will be pre-programmed using information contained in</p=
re><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;break=
-before:page;color:rgb(0,0,0)">   the PATH_LIST will effectively result in =
destination address swap.
   Such NAT translation is to be of unidirectional character can can
   remain fully stateless.</pre></div><div><br></div><div>The way I read Ro=
n&#39;s suggestion - it would result in huge address space waist for no rea=
son. That&#39;s all.=C2=A0</div><div><br></div><div>Many thx,</div><div>Rob=
ert.</div><div><br></div><div>PS.=C2=A0</div><div>** As side comment let me=
 share that some of my observations lead me to believe that the biggest obs=
tacle of IPv6 deployment in a lot of enterprises is the notion of end to en=
d IPv6 transparency. But this is different topic and different thread.<br><=
/div><div><br></div><div><br></div></div><div class=3D"gmail_quote"><div di=
r=3D"ltr" class=3D"gmail_attr">On Sun, Oct 13, 2019 at 11:46 PM Mark Smith =
&lt;<a href=3D"mailto:markzzzsmith@gmail.com" target=3D"_blank">markzzzsmit=
h@gmail.com</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"><div dir=3D"auto"><div><br><br><div class=3D"gmail_quote"><div d=
ir=3D"ltr" class=3D"gmail_attr">On Mon, 14 Oct 2019, 08:24 Robert Raszuk, &=
lt;<a href=3D"mailto:robert@raszuk.net" rel=3D"noreferrer noreferrer norefe=
rrer noreferrer noreferrer noreferrer noreferrer" target=3D"_blank">robert@=
raszuk.net</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"><div dir=3D"ltr"><div>Hi Ron,</div><div><br></div><div>I disagre=
e.=C2=A0</div><div><br></div><div>Your suggestion violates=C2=A0longest pre=
fix match principle in routing.=C2=A0</div><div><br></div><div>It is huge w=
aist of address space and is not specific to IPv6 at all.=C2=A0</div><div><=
br></div><div>Let me describe the deployment case where your suggestion=C2=
=A0would cause it to break:=C2=A0</div><div><br></div><div>I have /64 prefi=
x where a few=C2=A0 /128s from that space I allocate to local interfaces ma=
king it a local v6 destinations on those nodes.=C2=A0</div><div><br></div><=
div>However in the spirit of CIDR I still want to to use some blocks of tha=
t space - say=C2=A0 /126 or /124 as blocks which I only use to trigger loca=
l NAT as per=C2=A0rfc6296. </div></div></blockquote></div></div><div dir=3D=
"auto"><br></div><div dir=3D"auto">Realise that RFC6296 is Experimental, an=
d therefore nothing standard track can rely on it.</div><div dir=3D"auto"><=
br></div><div dir=3D"auto">Don&#39;t use NAT. IPv6 is pointless if you do.<=
/div><div dir=3D"auto"><br></div><div dir=3D"auto">RFC2993 -=C2=A0<span sty=
le=3D"font-size:1em;font-weight:bold">Architectural Implications of NAT</sp=
an></div><div dir=3D"auto"><b><a href=3D"https://tools.ietf.org/html/rfc299=
3" rel=3D"noreferrer noreferrer noreferrer noreferrer" target=3D"_blank">ht=
tps://tools.ietf.org/html/rfc2993</a></b><br></div><div dir=3D"auto"><br></=
div><div dir=3D"auto"><br></div><div dir=3D"auto">The Touble with NAT - APN=
IC blog articles</div><div dir=3D"auto"><br></div><div dir=3D"auto"><a href=
=3D"https://blog.apnic.net/2016/10/25/trouble-nat-part-1/" rel=3D"noreferre=
r noreferrer" target=3D"_blank">https://blog.apnic.net/2016/10/25/trouble-n=
at-part-1/</a><br></div><div dir=3D"auto"><br></div><div dir=3D"auto"><a hr=
ef=3D"https://blog.apnic.net/2016/10/26/trouble-nat-part-2/" rel=3D"norefer=
rer" target=3D"_blank">https://blog.apnic.net/2016/10/26/trouble-nat-part-2=
/</a><br></div><div dir=3D"auto"><br></div><div dir=3D"auto"><a href=3D"htt=
ps://blog.apnic.net/2016/10/27/trouble-nat-part-3/" target=3D"_blank">https=
://blog.apnic.net/2016/10/27/trouble-nat-part-3/</a><br></div><div dir=3D"a=
uto"><br></div><div dir=3D"auto"><br></div><div dir=3D"auto"><div class=3D"=
gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"=
ltr"><div>And NAT does not require local address to be a destination addres=
s so it would be a big disservice to kill such deployment option.=C2=A0</di=
v><div dir=3D"ltr"><br></div><div>Many thx,<br>R.</div><div dir=3D"ltr"><br=
></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr"=
>On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica &lt;rbonica=3D<a href=3D"mailt=
o:40juniper.net@dmarc.ietf.org" rel=3D"noreferrer noreferrer noreferrer nor=
eferrer noreferrer noreferrer noreferrer noreferrer" target=3D"_blank">40ju=
niper.net@dmarc.ietf.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">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">Folks,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">I think that we need a global rule that says:<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">=E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as=
 described in RFC 4291, all /128 MUST either:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li style=3D"margin-left:0in"><span style=3D"font-size:11pt;font-family:Cal=
ibri,sans-serif">Represent an IPv6 interface, as described in RFC 4291, or<=
u></u><u></u></span></li><li style=3D"margin-left:0in"><span style=3D"font-=
size:11pt;font-family:Calibri,sans-serif">Be unassigned=E2=80=9D<u></u><u><=
/u></span></li></ul>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">The 6man WG will need to make such a statement since it owns RFC =
4291.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0Ron</span></p></div></div></blockquote></div></div>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" rel=3D"noreferrer noreferrer noreferrer =
noreferrer noreferrer noreferrer noreferrer noreferrer" target=3D"_blank">s=
pring@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer =
noreferrer noreferrer noreferrer noreferrer noreferrer noreferrer noreferre=
r noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/sprin=
g</a><br>
</blockquote></div></div></div>
</blockquote></div></div>

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From: Ron Bonica <rbonica@juniper.net>
To: Robert Raszuk <robert@raszuk.net>
CC: SPRING WG List <spring@ietf.org>
Thread-Topic: IPv6 Addresses and SIDs
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Subject: Re: [spring] IPv6 Addresses and SIDs
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Content-Type: text/plain; charset="us-ascii"
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Robert,

If you don't segregate addresses that represent address from addresses that=
 don't represent addresses, how will IPv6 Neighbor Discovery be impacted?

                                          Ron

From: Robert Raszuk <robert@raszuk.net>
Sent: Sunday, October 13, 2019 5:24 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: SPRING WG List <spring@ietf.org>
Subject: IPv6 Addresses and SIDs

Hi Ron,

I disagree.

Your suggestion violates longest prefix match principle in routing.

It is huge waist of address space and is not specific to IPv6 at all.

Let me describe the deployment case where your suggestion would cause it to=
 break:

I have /64 prefix where a few  /128s from that space I allocate to local in=
terfaces making it a local v6 destinations on those nodes.

However in the spirit of CIDR I still want to to use some blocks of that sp=
ace - say  /126 or /124 as blocks which I only use to trigger local NAT as =
per rfc6296. And NAT does not require local address to be a destination add=
ress so it would be a big disservice to kill such deployment option.

Many thx,
R.


On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D40juniper.net@dmarc.=
ietf.org<mailto:40juniper.net@dmarc.ietf.org>> wrote:
Folks,

I think that we need a global rule that says:

"With a /64, if one /128 represents an IPv6 interface, as described in RFC =
4291, all /128 MUST either:


  *   Represent an IPv6 interface, as described in RFC 4291, or
  *   Be unassigned"

The 6man WG will need to make such a statement since it owns RFC 4291.

                                                             Ron


Juniper Business Use Only

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</o:shapelayout></xml><![endif]-->
</head>
<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Robert,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">If you don&#8217;t segregate addresses that represen=
t address from addresses that don&#8217;t represent addresses, how will IPv=
6 Neighbor Discovery be impacted?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><b>From:</b> Robert Raszuk &lt;robert@raszuk.net&gt;=
 <br>
<b>Sent:</b> Sunday, October 13, 2019 5:24 PM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Cc:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> IPv6 Addresses and SIDs<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">Hi Ron,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I disagree.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Your suggestion violates&nbsp;longest prefix match p=
rinciple in routing.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">It is huge waist of address space and is not specifi=
c to IPv6 at all.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Let me describe the deployment case where your sugge=
stion&nbsp;would cause it to break:&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I have /64 prefix where a few&nbsp; /128s from that =
space I allocate to local interfaces making it a local v6 destinations on t=
hose nodes.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">However in the spirit of CIDR I still want to to use=
 some blocks of that space - say&nbsp; /126 or /124 as blocks which I only =
use to trigger local NAT as per&nbsp;rfc6296. And NAT does not require loca=
l address to be a destination address so it
 would be a big disservice to kill such deployment option.&nbsp;<o:p></o:p>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Many thx,<br>
R.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica &lt;rbon=
ica=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40j=
uniper.net@dmarc.ietf.org</a>&gt; wrote:<o:p></o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Folks,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">I think that we need a global rule that says:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&#8220;With a /64, if one /128 represents an IPv6 interface, as de=
scribed in RFC 4291, all /128 MUST either:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l0 level1 lfo3">
Represent an IPv6 interface, as described in RFC 4291, or<o:p></o:p></li><l=
i class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;mso-list:l0 level1 lfo3">
Be unassigned&#8221;<o:p></o:p></li></ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">The 6man WG will need to make such a statement since it owns RFC 4=
291.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</body>
</html>

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From: Ron Bonica <rbonica@juniper.net>
To: Robert Raszuk <robert@raszuk.net>
CC: SPRING WG List <spring@ietf.org>
Thread-Topic: IPv6 Addresses and SIDs
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Subject: Re: [spring] IPv6 Addresses and SIDs
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Content-Type: text/plain; charset="us-ascii"
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Robert,

I'm having a hard time understanding exactly how I have violated the longes=
t match principle. Could you provide:


  *   A pointer to a statement of the longest match principle
  *   A few words regarding how I have violated it

                                                              Ron


From: Robert Raszuk <robert@raszuk.net>
Sent: Sunday, October 13, 2019 5:24 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: SPRING WG List <spring@ietf.org>
Subject: IPv6 Addresses and SIDs

Hi Ron,

I disagree.

Your suggestion violates longest prefix match principle in routing.

It is huge waist of address space and is not specific to IPv6 at all.

Let me describe the deployment case where your suggestion would cause it to=
 break:

I have /64 prefix where a few  /128s from that space I allocate to local in=
terfaces making it a local v6 destinations on those nodes.

However in the spirit of CIDR I still want to to use some blocks of that sp=
ace - say  /126 or /124 as blocks which I only use to trigger local NAT as =
per rfc6296. And NAT does not require local address to be a destination add=
ress so it would be a big disservice to kill such deployment option.

Many thx,
R.


On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D40juniper.net@dmarc.=
ietf.org<mailto:40juniper.net@dmarc.ietf.org>> wrote:
Folks,

I think that we need a global rule that says:

"With a /64, if one /128 represents an IPv6 interface, as described in RFC =
4291, all /128 MUST either:


  *   Represent an IPv6 interface, as described in RFC 4291, or
  *   Be unassigned"

The 6man WG will need to make such a statement since it owns RFC 4291.

                                                             Ron


Juniper Business Use Only

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</head>
<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Robert,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I&#8217;m having a hard time understanding exactly h=
ow I have violated the longest match principle. Could you provide:<o:p></o:=
p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l1 level1 =
lfo3">A pointer to a statement of the longest match principle<o:p></o:p></l=
i><li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l1 level=
1 lfo3">A few words regarding how I have violated it<o:p></o:p></li></ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><b>From:</b> Robert Raszuk &lt;robert@raszuk.net&gt;=
 <br>
<b>Sent:</b> Sunday, October 13, 2019 5:24 PM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Cc:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> IPv6 Addresses and SIDs<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">Hi Ron,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I disagree.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Your suggestion violates&nbsp;longest prefix match p=
rinciple in routing.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">It is huge waist of address space and is not specifi=
c to IPv6 at all.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Let me describe the deployment case where your sugge=
stion&nbsp;would cause it to break:&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I have /64 prefix where a few&nbsp; /128s from that =
space I allocate to local interfaces making it a local v6 destinations on t=
hose nodes.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">However in the spirit of CIDR I still want to to use=
 some blocks of that space - say&nbsp; /126 or /124 as blocks which I only =
use to trigger local NAT as per&nbsp;rfc6296. And NAT does not require loca=
l address to be a destination address so it
 would be a big disservice to kill such deployment option.&nbsp;<o:p></o:p>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Many thx,<br>
R.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica &lt;rbon=
ica=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40j=
uniper.net@dmarc.ietf.org</a>&gt; wrote:<o:p></o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Folks,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">I think that we need a global rule that says:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&#8220;With a /64, if one /128 represents an IPv6 interface, as de=
scribed in RFC 4291, all /128 MUST either:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l2 level1 lfo6">
Represent an IPv6 interface, as described in RFC 4291, or<o:p></o:p></li><l=
i class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;mso-list:l2 level1 lfo6">
Be unassigned&#8221;<o:p></o:p></li></ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">The 6man WG will need to make such a statement since it owns RFC 4=
291.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 14 Oct 2019 00:45:45 +0200
Message-ID: <CAOj+MMHfpKTSy+E8+yLrtg9euiUtFKmaUT8Y+_i65qVYvgr9fg@mail.gmail.com>
To: Ron Bonica <rbonica@juniper.net>
Cc: SPRING WG List <spring@ietf.org>
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Ron,

The segregation is very natural - the addresses allocated to the local
interfaces (physical or virtual) are your local addresses. Remaining
addresses are not. Of course local address may be other then /128 as
described in expired Mark's draft:
https://www.ietf.org/archive/id/draft-smith-v6ops-larger-ipv6-loopback-pref=
ix-04.txt

Thx,
R.



On Mon, Oct 14, 2019 at 12:39 AM Ron Bonica <rbonica@juniper.net> wrote:

> Robert,
>
>
>
> If you don=E2=80=99t segregate addresses that represent address from addr=
esses
> that don=E2=80=99t represent addresses, how will IPv6 Neighbor Discovery =
be
> impacted?
>
>
>
>                                           Ron
>
>  Juniper Business Use Only
>
>

--0000000000009249bb0594d28394
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<div dir=3D"ltr"><div>Ron,</div><div><br></div><div>The segregation is very=
 natural - the addresses allocated to the local interfaces (physical or vir=
tual) are your local addresses. Remaining addresses are not. Of course loca=
l address may be other then /128 as described in expired Mark&#39;s draft:=
=C2=A0<a href=3D"https://www.ietf.org/archive/id/draft-smith-v6ops-larger-i=
pv6-loopback-prefix-04.txt" target=3D"_blank">https://www.ietf.org/archive/=
id/draft-smith-v6ops-larger-ipv6-loopback-prefix-04.txt</a></div><div><br><=
/div><div>Thx,<br>R.</div><div><br></div><div><br></div><br><div class=3D"g=
mail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Oct 14, 2019 at 1=
2:39 AM Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_bl=
ank">rbonica@juniper.net</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">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal">Robert,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">If you don=E2=80=99t segregate addresses that repres=
ent address from addresses that don=E2=80=99t represent addresses, how will=
 IPv6 Neighbor Discovery be impacted?<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<span style=3D"color:black;font-size:7p=
t;text-align:center">Juniper Business Use Only</span></p><div><div><blockqu=
ote style=3D"border-top:none;border-right:none;border-bottom:none;border-le=
ft:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin:5pt 0in 5pt 4.=
8pt"><div><div><p align=3D"center" style=3D"margin:0in 0in 0.0001pt;text-al=
ign:center"><u></u></p>
</div>
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</div>
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</blockquote></div></div>

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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 14 Oct 2019 00:57:19 +0200
Message-ID: <CAOj+MME70PYa7mkTRPKHqhg_1cMAvHLU0qZJx-=CjVy-ZKXpAA@mail.gmail.com>
To: Ron Bonica <rbonica@juniper.net>
Cc: SPRING WG List <spring@ietf.org>
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Hi Ron,

/64 prefix is a pile of addresses ... if someone would be to follow your
suggestion I could not allocate some blocks of that prefix on R1, then some
other blocks on R2 then yet more on my servers.

You said:

*=E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as describe=
d in RFC
4291, all /128 MUST either:*



   - *Represent an IPv6 interface, as described in RFC 4291, or*
   - *Be unassigned=E2=80=9D*


Maybe you meant to say something else:

*=E2=80=9CWhen a /64 is used as SRv6 locator prefix, if one /128 represents=
 an IPv6
interface, as described in RFC 4291, all /128 MUST either:*



   - *Represent an IPv6 interface, as described in RFC 4291, or*
   - *Be unassigned=E2=80=9D*

But then you sent this to SPRINT indicating that 6MAN should be the
audience :).

Best,
R.


On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica <rbonica@juniper.net> wrote:

> Robert,
>
>
>
> I=E2=80=99m having a hard time understanding exactly how I have violated =
the
> longest match principle. Could you provide:
>
>
>
>    - A pointer to a statement of the longest match principle
>    - A few words regarding how I have violated it
>
>
>
>                                                               Ron
>
>
>
>
>
> *From:* Robert Raszuk <robert@raszuk.net>
> *Sent:* Sunday, October 13, 2019 5:24 PM
> *To:* Ron Bonica <rbonica@juniper.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* IPv6 Addresses and SIDs
>
>
>
> Hi Ron,
>
>
>
> I disagree.
>
>
>
> Your suggestion violates longest prefix match principle in routing.
>
>
>
> It is huge waist of address space and is not specific to IPv6 at all.
>
>
>
> Let me describe the deployment case where your suggestion would cause it
> to break:
>
>
>
> I have /64 prefix where a few  /128s from that space I allocate to local
> interfaces making it a local v6 destinations on those nodes.
>
>
>
> However in the spirit of CIDR I still want to to use some blocks of that
> space - say  /126 or /124 as blocks which I only use to trigger local NAT
> as per rfc6296. And NAT does not require local address to be a destinatio=
n
> address so it would be a big disservice to kill such deployment option.
>
>
>
> Many thx,
> R.
>
>
>
>
>
> On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D
> 40juniper.net@dmarc.ietf.org> wrote:
>
> Folks,
>
>
>
> I think that we need a global rule that says:
>
>
>
> =E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as describ=
ed in RFC
> 4291, all /128 MUST either:
>
>
>
>    - Represent an IPv6 interface, as described in RFC 4291, or
>    - Be unassigned=E2=80=9D
>
>
>
> The 6man WG will need to make such a statement since it owns RFC 4291.
>
>
>
>                                                              Ron
>
>
>
> Juniper Business Use Only
>
>

--000000000000ec04340594d2ac37
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Ron,<div><br></div><div>/64 prefix is a pile of address=
es ... if someone would be to follow your suggestion I could not allocate s=
ome blocks of that prefix on R1, then some other blocks on R2 then yet more=
 on my servers.=C2=A0</div><div><br></div><div>You said:=C2=A0</div><div><b=
><br></b></div><div><p class=3D"MsoNormal"><span style=3D"font-size:11pt;fo=
nt-family:Calibri,sans-serif"><b>=E2=80=9CWith a /64, if one /128 represent=
s an IPv6 interface, as described in RFC 4291, all /128 MUST either:<u></u>=
<u></u></b></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11pt;=
font-family:Calibri,sans-serif"><b><u></u>=C2=A0<u></u></b></span></p><ul t=
ype=3D"disc" style=3D"margin-top:0in"><li style=3D"margin-left:0in"><span s=
tyle=3D"font-size:11pt;font-family:Calibri,sans-serif"><b>Represent an IPv6=
 interface, as described in RFC 4291, or<u></u><u></u></b></span></li><li s=
tyle=3D"margin-left:0in"><span style=3D"font-size:11pt;font-family:Calibri,=
sans-serif"><b>Be unassigned=E2=80=9D</b></span></li></ul><div><span style=
=3D"font-size:14.6667px;font-family:Calibri,sans-serif"><br></span></div><d=
iv><span style=3D"font-size:14.6667px;font-family:Calibri,sans-serif">Maybe=
 you meant to say something else:=C2=A0</span><br></div></div><div><span st=
yle=3D"font-size:14.6667px;font-family:Calibri,sans-serif"><br></span></div=
><div><p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif"><b><font color=3D"#ff0000">=E2=80=9CWhen a /64 is used as S=
Rv6 locator prefix,</font><font color=3D"#000000"> if one /128 represents a=
n IPv6 interface, as described in RFC 4291, all /128 MUST either:<u></u><u>=
</u></font></b></span></p><p class=3D"MsoNormal"><span style=3D"font-size:1=
1pt;font-family:Calibri,sans-serif"><b><font color=3D"#000000"><u></u>=C2=
=A0<u></u></font></b></span></p><ul type=3D"disc" style=3D"margin-top:0in">=
<li style=3D"margin-left:0in"><span style=3D"font-size:11pt;font-family:Cal=
ibri,sans-serif"><b><font color=3D"#000000">Represent an IPv6 interface, as=
 described in RFC 4291, or<u></u><u></u></font></b></span></li><li style=3D=
"margin-left:0in"><span style=3D"font-size:11pt;font-family:Calibri,sans-se=
rif"><b><font color=3D"#000000">Be unassigned=E2=80=9D</font></b></span></l=
i></ul></div><div><span style=3D"font-size:14.6667px;font-family:Calibri,sa=
ns-serif">But then you sent this to SPRINT indicating that 6MAN should be t=
he audience :).=C2=A0</span><br></div><div><font face=3D"Calibri, sans-seri=
f"><span style=3D"font-size:14.6667px"><br></span></font></div><div><font f=
ace=3D"Calibri, sans-serif"><span style=3D"font-size:14.6667px">Best,<br>R.=
</span></font></div><div><br></div></div><br><div class=3D"gmail_quote"><di=
v dir=3D"ltr" class=3D"gmail_attr">On Mon, Oct 14, 2019 at 12:45 AM Ron Bon=
ica &lt;<a href=3D"mailto:rbonica@juniper.net">rbonica@juniper.net</a>&gt; =
wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_2315130379624766842WordSection1">
<p class=3D"MsoNormal">Robert,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">I=E2=80=99m having a hard time understanding exactly=
 how I have violated the longest match principle. Could you provide:<u></u>=
<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"gmail-m_2315130379624766842MsoListParagraph" style=3D"margin-l=
eft:0in">A pointer to a statement of the longest match principle<u></u><u><=
/u></li><li class=3D"gmail-m_2315130379624766842MsoListParagraph" style=3D"=
margin-left:0in">A few words regarding how I have violated it<u></u><u></u>=
</li></ul>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><b>From:</b> Robert Raszuk &lt;<a href=3D"mailto:rob=
ert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; <br>
<b>Sent:</b> Sunday, October 13, 2019 5:24 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> IPv6 Addresses and SIDs<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">Hi Ron,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I disagree.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Your suggestion violates=C2=A0longest prefix match p=
rinciple in routing.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">It is huge waist of address space and is not specifi=
c to IPv6 at all.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Let me describe the deployment case where your sugge=
stion=C2=A0would cause it to break:=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I have /64 prefix where a few=C2=A0 /128s from that =
space I allocate to local interfaces making it a local v6 destinations on t=
hose nodes.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">However in the spirit of CIDR I still want to to use=
 some blocks of that space - say=C2=A0 /126 or /124 as blocks which I only =
use to trigger local NAT as per=C2=A0rfc6296. And NAT does not require loca=
l address to be a destination address so it
 would be a big disservice to kill such deployment option.=C2=A0<u></u><u><=
/u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Many thx,<br>
R.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica &lt;rbon=
ica=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40j=
uniper.net@dmarc.ietf.org</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin:5pt 0i=
n 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal">Folks,<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">I think that we need a global rule that says:<u></u>=
<u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">=E2=80=9CWith a /64, if one /128 represents an IPv6 =
interface, as described in RFC 4291, all /128 MUST either:<u></u><u></u></p=
>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
Represent an IPv6 interface, as described in RFC 4291, or<u></u><u></u></li=
><li class=3D"MsoNormal">
Be unassigned=E2=80=9D<u></u><u></u></li></ul>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">The 6man WG will need to make such a statement since=
 it owns RFC 4291.<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0Ron<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"gmail-m_2315130379624766842msipfooter30b3d538" align=3D"center"=
 style=3D"margin:0in 0in 0.0001pt;text-align:center">
<span style=3D"font-size:7pt;color:black">Juniper Business Use Only</span><=
u></u><u></u></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>

</blockquote></div>

--000000000000ec04340594d2ac37--


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From: Mark Smith <markzzzsmith@gmail.com>
Date: Mon, 14 Oct 2019 10:36:50 +1100
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To: Robert Raszuk <robert@raszuk.net>
Cc: Ron Bonica <rbonica@juniper.net>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] IPv6 Addresses and SIDs
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On Mon, 14 Oct 2019 at 09:57, Robert Raszuk <robert@raszuk.net> wrote:
>
> Hi Ron,
>
> /64 prefix is a pile of addresses ...


It's more than that, there is an addressing model to follow. From RFC 4291,

"2.1.  Addressing Model

   IPv6 addresses of all types are assigned to interfaces, not nodes.
   An IPv6 unicast address refers to a single interface.  Since each
   interface belongs to a single node, any of that node's interfaces'
   unicast addresses may be used as an identifier for the node."


> if someone would be to follow your suggestion I could not allocate some b=
locks of that prefix on R1, then some other blocks on R2 then yet more on m=
y servers.
>

You would have to divide your /64 of into smaller subnets to do that.

> You said:
>
> =E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as describ=
ed in RFC 4291, all /128 MUST either:
>
>
>
> Represent an IPv6 interface, as described in RFC 4291, or
> Be unassigned=E2=80=9D
>
>
> Maybe you meant to say something else:
>
> =E2=80=9CWhen a /64 is used as SRv6 locator prefix, if one /128 represent=
s an IPv6 interface, as described in RFC 4291, all /128 MUST either:
>
>
>
> Represent an IPv6 interface, as described in RFC 4291, or
> Be unassigned=E2=80=9D
>
> But then you sent this to SPRINT indicating that 6MAN should be the audie=
nce :).
>
> Best,
> R.
>
>
> On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica <rbonica@juniper.net> wrote:
>>
>> Robert,
>>
>>
>>
>> I=E2=80=99m having a hard time understanding exactly how I have violated=
 the longest match principle. Could you provide:
>>
>>
>>
>> A pointer to a statement of the longest match principle
>> A few words regarding how I have violated it
>>
>>
>>
>>                                                               Ron
>>
>>
>>
>>
>>
>> From: Robert Raszuk <robert@raszuk.net>
>> Sent: Sunday, October 13, 2019 5:24 PM
>> To: Ron Bonica <rbonica@juniper.net>
>> Cc: SPRING WG List <spring@ietf.org>
>> Subject: IPv6 Addresses and SIDs
>>
>>
>>
>> Hi Ron,
>>
>>
>>
>> I disagree.
>>
>>
>>
>> Your suggestion violates longest prefix match principle in routing.
>>
>>
>>
>> It is huge waist of address space and is not specific to IPv6 at all.
>>
>>
>>
>> Let me describe the deployment case where your suggestion would cause it=
 to break:
>>
>>
>>
>> I have /64 prefix where a few  /128s from that space I allocate to local=
 interfaces making it a local v6 destinations on those nodes.
>>
>>
>>
>> However in the spirit of CIDR I still want to to use some blocks of that=
 space - say  /126 or /124 as blocks which I only use to trigger local NAT =
as per rfc6296. And NAT does not require local address to be a destination =
address so it would be a big disservice to kill such deployment option.
>>
>>
>>
>> Many thx,
>> R.
>>
>>
>>
>>
>>
>> On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D40juniper.net@dma=
rc.ietf.org> wrote:
>>
>> Folks,
>>
>>
>>
>> I think that we need a global rule that says:
>>
>>
>>
>> =E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as descri=
bed in RFC 4291, all /128 MUST either:
>>
>>
>>
>> Represent an IPv6 interface, as described in RFC 4291, or
>> Be unassigned=E2=80=9D
>>
>>
>>
>> The 6man WG will need to make such a statement since it owns RFC 4291.
>>
>>
>>
>>                                                              Ron
>>
>>
>>
>> Juniper Business Use Only
>
> _______________________________________________
> spring mailing list
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From: Ron Bonica <rbonica@juniper.net>
To: Robert Raszuk <robert@raszuk.net>
CC: SPRING WG List <spring@ietf.org>
Thread-Topic: IPv6 Addresses and SIDs
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Subject: Re: [spring] IPv6 Addresses and SIDs
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Robert,

Yeah, there were a few typos in my original message. What I meant to say wa=
s:


  *   If a /64 contains a SID, it MUST NOT contain any addresses that repre=
sent interfaces.
  *   If a /64 contains an address that represents an interface, it MUST NO=
T contain SIDs.

If we don't do this, we have to specify how nodes behave when they receive =
ICMPv6 NS messages in which the target is:


  *   A locally instantiated SID
  *   A SID learned from the IGP

                                                                      Ron


From: Robert Raszuk <robert@raszuk.net>
Sent: Sunday, October 13, 2019 6:57 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: SPRING WG List <spring@ietf.org>
Subject: Re: IPv6 Addresses and SIDs

Hi Ron,

/64 prefix is a pile of addresses ... if someone would be to follow your su=
ggestion I could not allocate some blocks of that prefix on R1, then some o=
ther blocks on R2 then yet more on my servers.

You said:

"With a /64, if one /128 represents an IPv6 interface, as described in RFC =
4291, all /128 MUST either:


  *   Represent an IPv6 interface, as described in RFC 4291, or
  *   Be unassigned"

Maybe you meant to say something else:

"When a /64 is used as SRv6 locator prefix, if one /128 represents an IPv6 =
interface, as described in RFC 4291, all /128 MUST either:


  *   Represent an IPv6 interface, as described in RFC 4291, or
  *   Be unassigned"
But then you sent this to SPRINT indicating that 6MAN should be the audienc=
e :).

Best,
R.


On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica <rbonica@juniper.net<mailto:rbo=
nica@juniper.net>> wrote:
Robert,

I'm having a hard time understanding exactly how I have violated the longes=
t match principle. Could you provide:


  *   A pointer to a statement of the longest match principle
  *   A few words regarding how I have violated it

                                                              Ron


From: Robert Raszuk <robert@raszuk.net<mailto:robert@raszuk.net>>
Sent: Sunday, October 13, 2019 5:24 PM
To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Cc: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: IPv6 Addresses and SIDs

Hi Ron,

I disagree.

Your suggestion violates longest prefix match principle in routing.

It is huge waist of address space and is not specific to IPv6 at all.

Let me describe the deployment case where your suggestion would cause it to=
 break:

I have /64 prefix where a few  /128s from that space I allocate to local in=
terfaces making it a local v6 destinations on those nodes.

However in the spirit of CIDR I still want to to use some blocks of that sp=
ace - say  /126 or /124 as blocks which I only use to trigger local NAT as =
per rfc6296. And NAT does not require local address to be a destination add=
ress so it would be a big disservice to kill such deployment option.

Many thx,
R.


On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D40juniper.net@dmarc.=
ietf.org<mailto:40juniper.net@dmarc.ietf.org>> wrote:
Folks,

I think that we need a global rule that says:

"With a /64, if one /128 represents an IPv6 interface, as described in RFC =
4291, all /128 MUST either:


  *   Represent an IPv6 interface, as described in RFC 4291, or
  *   Be unassigned"

The 6man WG will need to make such a statement since it owns RFC 4291.

                                                             Ron


Juniper Business Use Only


Juniper Business Use Only

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<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Robert,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Yeah, there were a few typos in my original message.=
 What I meant to say was:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l3 level1 =
lfo1">If a /64 contains a SID, it MUST NOT contain any addresses that repre=
sent interfaces.<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"mar=
gin-left:0in;mso-list:l3 level1 lfo1">If a /64 contains an address that rep=
resents an interface, it MUST NOT contain SIDs.<o:p></o:p></li></ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">If we don&#8217;t do this, we have to specify how no=
des behave when they receive ICMPv6 NS messages in which the target is:<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l3 level1 =
lfo1">A locally instantiated SID<o:p></o:p></li><li class=3D"MsoListParagra=
ph" style=3D"margin-left:0in;mso-list:l3 level1 lfo1">A SID learned from th=
e IGP<o:p></o:p></li></ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:=
p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><b>From:</b> Robert Raszuk &lt;robert@raszuk.net&gt;=
 <br>
<b>Sent:</b> Sunday, October 13, 2019 6:57 PM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Cc:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> Re: IPv6 Addresses and SIDs<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">Hi Ron,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">/64 prefix is a pile of addresses ... if someone wou=
ld be to follow your suggestion I could not allocate some blocks of that pr=
efix on R1, then some other blocks on R2 then yet more on my servers.&nbsp;=
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">You said:&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b>&#8220;With a /64, if one /128 represents an IPv6 interface, as=
 described in RFC 4291, all /128 MUST either:</b><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b>&nbsp;</b><o:p></o:p></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l1 level1 lfo2">
<b>Represent an IPv6 interface, as described in RFC 4291, or</b><o:p></o:p>=
</li><li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bo=
ttom-alt:auto;mso-list:l1 level1 lfo2">
<b>Be unassigned&#8221;</b><o:p></o:p></li></ul>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Maybe you meant to say something else:&nbsp;<o:p></o=
:p></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span style=3D"color:red">&#8220;When a /64 is used as SRv6 loc=
ator prefix,</span><span style=3D"color:black"> if one /128 represents an I=
Pv6 interface, as described in RFC 4291, all /128
 MUST either:</span></b><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span style=3D"color:black">&nbsp;</span></b><o:p></o:p></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l0 level1 lfo3">
<b><span style=3D"color:black">Represent an IPv6 interface, as described in=
 RFC 4291, or</span></b><o:p></o:p></li><li class=3D"MsoNormal" style=3D"ms=
o-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<b><span style=3D"color:black">Be unassigned&#8221;</span></b><o:p></o:p></=
li></ul>
</div>
<div>
<p class=3D"MsoNormal">But then you sent this to SPRINT indicating that 6MA=
N should be the audience :).&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Best,<br>
R.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica &lt;<a h=
ref=3D"mailto:rbonica@juniper.net">rbonica@juniper.net</a>&gt; wrote:<o:p><=
/o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Robert,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">I&#8217;m having a hard time understanding exactly how I have viol=
ated the longest match principle. Could you provide:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<ul type=3D"disc">
<li class=3D"gmail-m2315130379624766842msolistparagraph" style=3D"mso-list:=
l2 level1 lfo4">
A pointer to a statement of the longest match principle<o:p></o:p></li><li =
class=3D"gmail-m2315130379624766842msolistparagraph" style=3D"mso-list:l2 l=
evel1 lfo4">
A few words regarding how I have violated it<o:p></o:p></li></ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;Ron<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b>From:</b> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net=
" target=3D"_blank">robert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 5:24 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> IPv6 Addresses and SIDs<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Hi Ron,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">I disagree.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Your suggestion violates&nbsp;longest prefix match principle in ro=
uting.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">It is huge waist of address space and is not specific to IPv6 at a=
ll.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Let me describe the deployment case where your suggestion&nbsp;wou=
ld cause it to break:&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">I have /64 prefix where a few&nbsp; /128s from that space I alloca=
te to local interfaces making it a local v6 destinations on those nodes.&nb=
sp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">However in the spirit of CIDR I still want to to use some blocks o=
f that space - say&nbsp; /126 or /124 as blocks which I only use to trigger=
 local NAT as per&nbsp;rfc6296. And NAT does not
 require local address to be a destination address so it would be a big dis=
service to kill such deployment option.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Many thx,<br>
R.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica &lt;rbonica=3D<a href=
=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40juniper.net@dm=
arc.ietf.org</a>&gt; wrote:<o:p></o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Folks,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">I think that we need a global rule that says:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&#8220;With a /64, if one /128 represents an IPv6 interface, as de=
scribed in RFC 4291, all /128 MUST either:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l4 level1 lfo5">
Represent an IPv6 interface, as described in RFC 4291, or<o:p></o:p></li><l=
i class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;mso-list:l4 level1 lfo5">
Be unassigned&#8221;<o:p></o:p></li></ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">The 6man WG will need to make such a statement since it owns RFC 4=
291.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
Ron<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"gmail-m2315130379624766842msipfooter30b3d538" align=3D"center" =
style=3D"margin:0in;margin-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</body>
</html>

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Rajesh

I believe that is how it=E2=80=99s written but want to confirm that with SRv=
6 we added the PSP to mirror mpls and SR-MPLS PHP and added USP to mirror mp=
ls and UHP penultimate and ultimate hop pop that occurs either the default b=
ehavior on the egress P or USP on the egress PE FEC destination. =20

Thanks=20

Gyan

Sent from my iPhone

> On Oct 10, 2019, at 9:46 PM, Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.=
org> wrote:
>=20
> Wanted to know the use case where we only POP the SRH ?
> 4.16.1.  PSP: Penultimate Segment Pop of the SRH
>=20
>    The SRH processing of the End, End.X and End.T behaviors are
>    modified: after the instruction "S14.  Update IPv6 DA with Segment
>    List[Segments Left]" is executed, the following instructions must be
>    executed as well:
> =20
>    S14.1.   If (updated SL =3D=3D 0) {
>    S14.2.      Pop the SRH
>    S14.3.   }
> =20
>=20
> Juniper Business Use Only
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Rajesh<div><br></div><div>I believe that is=
 how it=E2=80=99s written but want to confirm that with SRv6 we added the PS=
P to mirror mpls and SR-MPLS PHP and added USP to mirror mpls and UHP penult=
imate and ultimate hop pop that occurs either the default behavior on the eg=
ress P or USP on the egress PE FEC destination. &nbsp;</div><div><br></div><=
div>Thanks&nbsp;</div><div><br></div><div>Gyan<br><br><div id=3D"AppleMailSi=
gnature" dir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br>On Oct 10=
, 2019, at 9:46 PM, Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@d=
marc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt; wrote:<br><br>=
</div><blockquote type=3D"cite"><div dir=3D"ltr">

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<pre>Wanted to know the use case where we only POP the SRH ?<o:p></o:p></pre=
>
<h4><a name=3D"section-4.16.1"></a><a href=3D"https://tools.ietf.org/html/dr=
aft-ietf-spring-srv6-network-programming-04#section-4.16.1"><span style=3D"m=
so-bookmark:&quot;section-4\.16\.1&quot;">4.16.1</span><span style=3D"mso-bo=
okmark:&quot;section-4\.16\.1&quot;"></span></a><span style=3D"mso-bookmark:=
&quot;section-4\.16\.1&quot;"></span><span style=3D"font-family:&quot;Courie=
r New&quot;">.&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><o:p></o:p></h4>
<pre>&nbsp;&nbsp; The SRH processing of the End, End.X and End.T behaviors a=
re<o:p></o:p></pre>
<pre>&nbsp;&nbsp; modified: after the instruction "S14.&nbsp; Update IPv6 DA=
 with Segment<o:p></o:p></pre>
<pre>&nbsp;&nbsp; List[Segments Left]" is executed, the following instructio=
ns must be<o:p></o:p></pre>
<pre>&nbsp;&nbsp; executed as well:<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&nbsp;&nbsp; S14.1.&nbsp;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></=
pre>
<pre>&nbsp;&nbsp; S14.2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p=
></pre>
<pre>&nbsp;&nbsp; S14.3.&nbsp;&nbsp; }<o:p></o:p></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<br>
<p class=3D"msipfooter30b3d538" align=3D"Center" style=3D"margin:0"><span st=
yle=3D"font-size:7.0pt;font-family:Calibri;color:#000000">Juniper Business U=
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In-line

Sent from my iPhone

> On Oct 14, 2019, at 12:47 AM, Gyan Mishra <hayabusagsm@gmail.com> wrote:
>=20
> Rajesh
>=20
> I believe that is how it=E2=80=99s written but want to confirm that with S=
Rv6 we added the PSP to mirror mpls and SR-MPLS PHP and added USP to mirror m=
pls and UHP penultimate and ultimate hop pop that occurs either the default b=
ehavior on the egress P or USP on the egress PE FEC destination. =20

Just to add to what I am saying so the PSP and USP is very critical and is n=
ot just something that was added to mimic mpls but is absolutely necessary w=
ith SRv6 from a IPv6 data plane standpoint that the EH that was inserted in-=
flight on intermediate nodes in this case the ingress PE so that EH header m=
ust be removed before the packet exits the SRv6 domain.

So the SRv6 domain construct of doing the removal PSP or USP is fine within t=
he SRv6 routing domain In a service provider network within their own domain=
 but when going inter domain especially in the internet use case this become=
s problematic as now the onus to remove the EH SRH Routing type 4 header is o=
n the downstream service provider many AS hops away and how is that enforced=
 that the EH will ever get removed.  More then likely it will not.

How do we get around that and does that put a monkey wrench in the ubiquitou=
s use cases for SRv6 especially the internet when many domains are involved w=
ith separate administrative control.
>=20
> Thanks=20
>=20
> Gyan
>=20
> Sent from my iPhone
>=20
>> On Oct 10, 2019, at 9:46 PM, Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf=
.org> wrote:
>>=20
>> Wanted to know the use case where we only POP the SRH ?
>> 4.16.1.  PSP: Penultimate Segment Pop of the SRH
>>=20
>>    The SRH processing of the End, End.X and End.T behaviors are
>>    modified: after the instruction "S14.  Update IPv6 DA with Segment
>>    List[Segments Left]" is executed, the following instructions must be
>>    executed as well:
>> =20
>>    S14.1.   If (updated SL =3D=3D 0) {
>>    S14.2.      Pop the SRH
>>    S14.3.   }
>> =20
>>=20
>> Juniper Business Use Only
>> _______________________________________________
>> spring mailing list
>> spring@ietf.org
>> https://www.ietf.org/mailman/listinfo/spring

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">In-line<br><br><div id=3D"AppleMailSignatur=
e" dir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br>On Oct 14, 2019=
, at 12:47 AM, Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.com">haya=
busagsm@gmail.com</a>&gt; wrote:<br><br></div><blockquote type=3D"cite"><div=
 dir=3D"ltr"><meta http-equiv=3D"content-type" content=3D"text/html; charset=
=3Dutf-8">Rajesh<div><br></div><div>I believe that is how it=E2=80=99s writt=
en but want to confirm that with SRv6 we added the PSP to mirror mpls and SR=
-MPLS PHP and added USP to mirror mpls and UHP penultimate and ultimate hop p=
op that occurs either the default behavior on the egress P or USP on the egr=
ess PE FEC destination. &nbsp;</div></div></blockquote><div><br></div>Just t=
o add to what I am saying so the PSP and USP is very critical and is not jus=
t something that was added to mimic mpls but is absolutely necessary with SR=
v6 from a IPv6 data plane standpoint that the EH that was inserted in-flight=
 on intermediate nodes in this case the ingress PE so that EH header must be=
 removed before the packet exits the SRv6 domain.<div><br></div><div>So the S=
Rv6 domain construct of doing the removal PSP or USP is fine within the SRv6=
 routing domain In a service provider network within their own domain but wh=
en going inter domain especially in the internet use case this becomes probl=
ematic as now the onus to remove the EH SRH Routing type 4 header is on the d=
ownstream service provider many AS hops away and how is that enforced that t=
he EH will ever get removed. &nbsp;More then likely it will not.</div><div><=
br></div><div>How do we get around that and does that put a monkey wrench in=
 the ubiquitous use cases for SRv6 especially the internet when many domains=
 are involved with separate administrative control.<br><blockquote type=3D"c=
ite"><div dir=3D"ltr"><div><br></div><div>Thanks&nbsp;</div><div><br></div><=
div>Gyan<br><br><div id=3D"AppleMailSignature" dir=3D"ltr">Sent from my iPho=
ne</div><div dir=3D"ltr"><br>On Oct 10, 2019, at 9:46 PM, Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh=3D40juniper.net@dmarc.ietf.org">mrajesh=3D40juniper.net=
@dmarc.ietf.org</a>&gt; wrote:<br><br></div><blockquote type=3D"cite"><div d=
ir=3D"ltr">

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<div class=3D"WordSection1">
<pre>Wanted to know the use case where we only POP the SRH ?<o:p></o:p></pre=
>
<h4><a name=3D"section-4.16.1"></a><a href=3D"https://tools.ietf.org/html/dr=
aft-ietf-spring-srv6-network-programming-04#section-4.16.1"><span style=3D"m=
so-bookmark:&quot;section-4\.16\.1&quot;">4.16.1</span><span style=3D"mso-bo=
okmark:&quot;section-4\.16\.1&quot;"></span></a><span style=3D"mso-bookmark:=
&quot;section-4\.16\.1&quot;"></span><span style=3D"font-family:&quot;Courie=
r New&quot;">.&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><o:p></o:p></h4>
<pre>&nbsp;&nbsp; The SRH processing of the End, End.X and End.T behaviors a=
re<o:p></o:p></pre>
<pre>&nbsp;&nbsp; modified: after the instruction "S14.&nbsp; Update IPv6 DA=
 with Segment<o:p></o:p></pre>
<pre>&nbsp;&nbsp; List[Segments Left]" is executed, the following instructio=
ns must be<o:p></o:p></pre>
<pre>&nbsp;&nbsp; executed as well:<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&nbsp;&nbsp; S14.1.&nbsp;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></=
pre>
<pre>&nbsp;&nbsp; S14.2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p=
></pre>
<pre>&nbsp;&nbsp; S14.3.&nbsp;&nbsp; }<o:p></o:p></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<br>
<p class=3D"msipfooter30b3d538" align=3D"Center" style=3D"margin:0"><span st=
yle=3D"font-size:7.0pt;font-family:Calibri;color:#000000">Juniper Business U=
se Only</span></p>
</div>


</div></blockquote><blockquote type=3D"cite"><div dir=3D"ltr"><span>________=
_______________________________________</span><br><span>spring mailing list<=
/span><br><span><a href=3D"mailto:spring@ietf.org">spring@ietf.org</a></span=
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www.ietf.org/mailman/listinfo/spring</a></span><br></div></blockquote></div>=
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<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Hi R=
on:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Make=
 sense, If there is a dedicated IPv6 block for SRv6 SID within SRv6 domain,=
 then trouble situation you described does NOT occur, because the IPv6 addr=
ess covered within SRv6 SID prefix does
 not be involved ICMPv6 ND protocol, because they are not configured under =
IP interfaces connected to =A1=B0Link=A1=B1.&nbsp; I also think that the au=
thors of NET-PGM draft have indicated that SRv6 SID has a separate IPv6 blo=
ck in their Draft, but they don=A1=AFt yet clearly stated
 which IPv6 block will be used for it. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;spring-bounces@ietf.org&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=
=BA=DA&quot;,sans-serif">=C4=EA</span><span lang=3D"EN-US">10</span><span s=
tyle=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=D4=C2=
</span><span lang=3D"EN-US">14</span><span style=3D"font-family:&quot;=CE=
=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C8=D5</span><span lang=3D"EN-US"> =
9:23<br>
<b>To:</b> Robert Raszuk &lt;robert@raszuk.net&gt;<br>
<b>Cc:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] IPv6 Addresses and SIDs<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Robert,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yeah, there were a few typos in=
 my original message. What I meant to say was:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l3 level1 =
lfo1"><span lang=3D"EN-US">If a /64 contains a SID, it MUST NOT contain any=
 addresses that represent interfaces.<o:p></o:p></span></li><li class=3D"Ms=
oListParagraph" style=3D"margin-left:0cm;mso-list:l3 level1 lfo1"><span lan=
g=3D"EN-US">If a /64 contains an address that represents an interface, it M=
UST NOT contain SIDs.<o:p></o:p></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If we don=A1=AFt do this, we ha=
ve to specify how nodes behave when they receive ICMPv6 NS messages in whic=
h the target is:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l3 level1 =
lfo1"><span lang=3D"EN-US">A locally instantiated SID<o:p></o:p></span></li=
><li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l3 level1=
 lfo1"><span lang=3D"EN-US">A SID learned from the IGP<o:p></o:p></span></l=
i></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net">robert@r=
aszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 6:57 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net">rbonica@ju=
niper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Subject:</b> Re: IPv6 Addresses and SIDs<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Ron,<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">/64 prefix is a pile of address=
es ... if someone would be to follow your suggestion I could not allocate s=
ome blocks of that prefix on R1, then some other blocks on R2 then yet more=
 on my servers.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You said:&nbsp;<o:p></o:p></spa=
n></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span lang=3D"EN-US">=A1=B0With a /64, if one /128 represents a=
n IPv6 interface, as described in RFC 4291, all /128 MUST either:</span></b=
><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span lang=3D"EN-US">&nbsp;</span></b><span lang=3D"EN-US"><o:p=
></o:p></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l1 level1 lfo2">
<b><span lang=3D"EN-US">Represent an IPv6 interface, as described in RFC 42=
91, or</span></b><span lang=3D"EN-US"><o:p></o:p></span></li><li class=3D"M=
soNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-l=
ist:l1 level1 lfo2">
<b><span lang=3D"EN-US">Be unassigned=A1=B1</span></b><span lang=3D"EN-US">=
<o:p></o:p></span></li></ul>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Maybe you meant to say somethin=
g else:&nbsp;<o:p></o:p></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span lang=3D"EN-US" style=3D"color:red">=A1=B0When a /64 is us=
ed as SRv6 locator prefix,</span><span lang=3D"EN-US" style=3D"color:black"=
> if one /128 represents an IPv6 interface, as described
 in RFC 4291, all /128 MUST either:</span></b><span lang=3D"EN-US"><o:p></o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span lang=3D"EN-US" style=3D"color:black">&nbsp;</span></b><sp=
an lang=3D"EN-US"><o:p></o:p></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l0 level1 lfo3">
<b><span lang=3D"EN-US" style=3D"color:black">Represent an IPv6 interface, =
as described in RFC 4291, or</span></b><span lang=3D"EN-US"><o:p></o:p></sp=
an></li><li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin=
-bottom-alt:auto;mso-list:l0 level1 lfo3">
<b><span lang=3D"EN-US" style=3D"color:black">Be unassigned=A1=B1</span></b=
><span lang=3D"EN-US"><o:p></o:p></span></li></ul>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">But then you sent this to SPRIN=
T indicating that 6MAN should be the audience :).&nbsp;<o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best,<br>
R.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Mon, Oct 14, 2019 at 12:45 A=
M Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net">rbonica@juniper.net=
</a>&gt; wrote:<o:p></o:p></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">Robert,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">I=A1=AFm having a hard time understanding exa=
ctly how I have violated the longest match principle. Could you provide:<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<ul type=3D"disc">
<li class=3D"gmail-m2315130379624766842msolistparagraph" style=3D"mso-list:=
l2 level1 lfo4">
<span lang=3D"EN-US">A pointer to a statement of the longest match principl=
e<o:p></o:p></span></li><li class=3D"gmail-m2315130379624766842msolistparag=
raph" style=3D"mso-list:l2 level1 lfo4">
<span lang=3D"EN-US">A few words regarding how I have violated it<o:p></o:p=
></span></li></ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span lang=3D"EN-US">From:</span></b><span lang=3D"EN-US"> Robe=
rt Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_blank">robert=
@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 5:24 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> IPv6 Addresses and SIDs<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">Hi Ron,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">I disagree.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">Your suggestion violates&nbsp;longest prefix =
match principle in routing.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">It is huge waist of address space and is not =
specific to IPv6 at all.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">Let me describe the deployment case where you=
r suggestion&nbsp;would cause it to break:&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">I have /64 prefix where a few&nbsp; /128s fro=
m that space I allocate to local interfaces making it a local v6 destinatio=
ns on those nodes.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">However in the spirit of CIDR I still want to=
 to use some blocks of that space - say&nbsp; /126 or /124 as blocks which =
I only use to trigger local NAT as per&nbsp;rfc6296.
 And NAT does not require local address to be a destination address so it w=
ould be a big disservice to kill such deployment option.&nbsp;<o:p></o:p></=
span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">Many thx,<br>
R.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica &=
lt;rbonica=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_bla=
nk">40juniper.net@dmarc.ietf.org</a>&gt; wrote:<o:p></o:p></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">Folks,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">I think that we need a global rule that says:=
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">=A1=B0With a /64, if one /128 represents an I=
Pv6 interface, as described in RFC 4291, all /128 MUST either:<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l4 level1 lfo5">
<span lang=3D"EN-US">Represent an IPv6 interface, as described in RFC 4291,=
 or<o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"mso-margin-top-a=
lt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo5">
<span lang=3D"EN-US">Be unassigned=A1=B1<o:p></o:p></span></li></ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">The 6man WG will need to make such a statemen=
t since it owns RFC 4291.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"gmail-m2315130379624766842msipfooter30b3d538" align=3D"center" =
style=3D"margin:0cm;margin-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
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In-Reply-To: <5ae3ab05035f439db46fe5126b1476db@nokia-sbell.com>
From: Mark Smith <markzzzsmith@gmail.com>
Date: Mon, 14 Oct 2019 19:07:38 +1100
Message-ID: <CAO42Z2wA0TPFNQkfOA0iNMfojb8D=QcntwoUi0LbWN7no0DRQA@mail.gmail.com>
To: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
Cc: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, Robert Raszuk <robert@raszuk.net>, SPRING WG List <spring@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/jQebFbf-bUHe0nzXjlHtRQjGwMs>
Subject: Re: [spring] IPv6 Addresses and SIDs
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On Mon, 14 Oct 2019, 16:45 Wang, Weibin (NSB - CN/Shanghai), <
weibin.wang@nokia-sbell.com> wrote:

> Hi Ron:
>
>
>
> Make sense, If there is a dedicated IPv6 block for SRv6 SID within SRv6
> domain, then trouble situation you described does NOT occur, because the
> IPv6 address covered within SRv6 SID prefix does not be involved ICMPv6 N=
D
> protocol, because they are not configured under IP interfaces connected t=
o
> =E2=80=9CLink=E2=80=9D.
>

That does not comply with the IPv6 Addressing Architecture RFC.

(I think this is the 4th time SPRING have or are ignoring IPv6
specifications.)

I also think that the authors of NET-PGM draft have indicated that SRv6 SID
> has a separate IPv6 block in their Draft, but they don=E2=80=99t yet clea=
rly stated
> which IPv6 block will be used for it.
>
>
>
>
>
> --------------------------------------
>
> *Cheers !*
>
>
>
>
>
> *WANG Weibin  *
>
>
>
> *From:* spring <spring-bounces@ietf.org> *On Behalf Of *Ron Bonica
> *Sent:* 2019=E5=B9=B410=E6=9C=8814=E6=97=A5 9:23
> *To:* Robert Raszuk <robert@raszuk.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* Re: [spring] IPv6 Addresses and SIDs
>
>
>
> Robert,
>
>
>
> Yeah, there were a few typos in my original message. What I meant to say
> was:
>
>
>
>    - If a /64 contains a SID, it MUST NOT contain any addresses that
>    represent interfaces.
>    - If a /64 contains an address that represents an interface, it MUST
>    NOT contain SIDs.
>
>
>
> If we don=E2=80=99t do this, we have to specify how nodes behave when the=
y receive
> ICMPv6 NS messages in which the target is:
>
>
>
>    - A locally instantiated SID
>    - A SID learned from the IGP
>
>
>
>                                                                       Ron
>
>
>
>
>
> *From:* Robert Raszuk <robert@raszuk.net>
> *Sent:* Sunday, October 13, 2019 6:57 PM
> *To:* Ron Bonica <rbonica@juniper.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* Re: IPv6 Addresses and SIDs
>
>
>
> Hi Ron,
>
>
>
> /64 prefix is a pile of addresses ... if someone would be to follow your
> suggestion I could not allocate some blocks of that prefix on R1, then so=
me
> other blocks on R2 then yet more on my servers.
>
>
>
> You said:
>
>
>
> *=E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as descri=
bed in
> RFC 4291, all /128 MUST either:*
>
>
>
>    - *Represent an IPv6 interface, as described in RFC 4291, or*
>    - *Be unassigned=E2=80=9D*
>
>
>
> Maybe you meant to say something else:
>
>
>
> *=E2=80=9CWhen a /64 is used as SRv6 locator prefix, if one /128 represen=
ts an
> IPv6 interface, as described in RFC 4291, all /128 MUST either:*
>
>
>
>    - *Represent an IPv6 interface, as described in RFC 4291, or*
>    - *Be unassigned=E2=80=9D*
>
> But then you sent this to SPRINT indicating that 6MAN should be the
> audience :).
>
>
>
> Best,
> R.
>
>
>
>
>
> On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica <rbonica@juniper.net> wrote:
>
> Robert,
>
>
>
> I=E2=80=99m having a hard time understanding exactly how I have violated =
the
> longest match principle. Could you provide:
>
>
>
>    - A pointer to a statement of the longest match principle
>    - A few words regarding how I have violated it
>
>
>
>                                                               Ron
>
>
>
>
>
> *From:* Robert Raszuk <robert@raszuk.net>
> *Sent:* Sunday, October 13, 2019 5:24 PM
> *To:* Ron Bonica <rbonica@juniper.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* IPv6 Addresses and SIDs
>
>
>
> Hi Ron,
>
>
>
> I disagree.
>
>
>
> Your suggestion violates longest prefix match principle in routing.
>
>
>
> It is huge waist of address space and is not specific to IPv6 at all.
>
>
>
> Let me describe the deployment case where your suggestion would cause it
> to break:
>
>
>
> I have /64 prefix where a few  /128s from that space I allocate to local
> interfaces making it a local v6 destinations on those nodes.
>
>
>
> However in the spirit of CIDR I still want to to use some blocks of that
> space - say  /126 or /124 as blocks which I only use to trigger local NAT
> as per rfc6296. And NAT does not require local address to be a destinatio=
n
> address so it would be a big disservice to kill such deployment option.
>
>
>
> Many thx,
> R.
>
>
>
>
>
> On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D
> 40juniper.net@dmarc.ietf.org> wrote:
>
> Folks,
>
>
>
> I think that we need a global rule that says:
>
>
>
> =E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as describ=
ed in RFC
> 4291, all /128 MUST either:
>
>
>
>    - Represent an IPv6 interface, as described in RFC 4291, or
>    - Be unassigned=E2=80=9D
>
>
>
> The 6man WG will need to make such a statement since it owns RFC 4291.
>
>
>
>                                                              Ron
>
>
>
> Juniper Business Use Only
>
>
>
> Juniper Business Use Only
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>

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Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto"><div><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Mon, 14 Oct 2019, 16:45 Wang, Weibin (NSB - CN/Shan=
ghai), &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com" target=3D"_blank"=
 rel=3D"noreferrer">weibin.wang@nokia-sbell.com</a>&gt; wrote:<br></div><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #=
ccc solid;padding-left:1ex">





<div lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Hi R=
on:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Make=
 sense, If there is a dedicated IPv6 block for SRv6 SID within SRv6 domain,=
 then trouble situation you described does NOT occur, because the IPv6 addr=
ess covered within SRv6 SID prefix does
 not be involved ICMPv6 ND protocol, because they are not configured under =
IP interfaces connected to =E2=80=9CLink=E2=80=9D.=C2=A0</span></p></div></=
div></blockquote></div></div><div dir=3D"auto"><br></div><div dir=3D"auto">=
That does not comply with the IPv6 Addressing Architecture RFC.</div><div d=
ir=3D"auto"><br></div><div dir=3D"auto">(I think this is the 4th time SPRIN=
G have or are ignoring IPv6 specifications.)</div><div dir=3D"auto"><br></d=
iv><div dir=3D"auto"><div class=3D"gmail_quote"><blockquote class=3D"gmail_=
quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex"><div lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple"><div><p class=3D"Mso=
Normal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"> I also think that =
the authors of NET-PGM draft have indicated that SRv6 SID has a separate IP=
v6 block in their Draft, but they don=E2=80=99t yet clearly stated
 which IPv6 block will be used for it. <u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<u></u><u></u></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><u></u>=C2=A0<u></u></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin=C2=A0
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0<u></u></span></p>
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" rel=3D"no=
referrer noreferrer" target=3D"_blank">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:&quot;\005fae\008f6f\009=
6c5\009ed1&quot;,sans-serif">=E5=B9=B4</span><span lang=3D"EN-US">10</span>=
<span style=3D"font-family:&quot;\005fae\008f6f\0096c5\009ed1&quot;,sans-se=
rif">=E6=9C=88</span><span lang=3D"EN-US">14</span><span style=3D"font-fami=
ly:&quot;\005fae\008f6f\0096c5\009ed1&quot;,sans-serif">=E6=97=A5</span><sp=
an lang=3D"EN-US"> 9:23<br>
<b>To:</b> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" rel=3D"no=
referrer noreferrer" target=3D"_blank">robert@raszuk.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" rel=3D"nor=
eferrer noreferrer" target=3D"_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] IPv6 Addresses and SIDs<u></u><u></u></span></=
p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Robert,<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yeah, there were a few typos in=
 my original message. What I meant to say was:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li style=3D"margin-left:0cm"><span lang=3D"EN-US">If a /64 contains a SID,=
 it MUST NOT contain any addresses that represent interfaces.<u></u><u></u>=
</span></li><li style=3D"margin-left:0cm"><span lang=3D"EN-US">If a /64 con=
tains an address that represents an interface, it MUST NOT contain SIDs.<u>=
</u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If we don=E2=80=99t do this, we=
 have to specify how nodes behave when they receive ICMPv6 NS messages in w=
hich the target is:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li style=3D"margin-left:0cm"><span lang=3D"EN-US">A locally instantiated S=
ID<u></u><u></u></span></li><li style=3D"margin-left:0cm"><span lang=3D"EN-=
US">A SID learned from the IGP<u></u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" rel=3D"n=
oreferrer noreferrer" target=3D"_blank">robert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 6:57 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" rel=3D"nor=
eferrer noreferrer" target=3D"_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" rel=3D"nor=
eferrer noreferrer" target=3D"_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: IPv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Ron,<u></u><u></u></span></p=
>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">/64 prefix is a pile of address=
es ... if someone would be to follow your suggestion I could not allocate s=
ome blocks of that prefix on R1, then some other blocks on R2 then yet more=
 on my servers.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You said:=C2=A0<u></u><u></u></=
span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">=E2=80=9CWith a /64, if one =
/128 represents an IPv6 interface, as described in RFC 4291, all /128 MUST =
either:</span></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">=C2=A0</span></b><span lang=
=3D"EN-US"><u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<b><span lang=3D"EN-US">Represent an IPv6 interface, as described in RFC 42=
91, or</span></b><span lang=3D"EN-US"><u></u><u></u></span></li><li class=
=3D"MsoNormal">
<b><span lang=3D"EN-US">Be unassigned=E2=80=9D</span></b><span lang=3D"EN-U=
S"><u></u><u></u></span></li></ul>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Maybe you meant to say somethin=
g else:=C2=A0<u></u><u></u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:red">=E2=80=
=9CWhen a /64 is used as SRv6 locator prefix,</span><span lang=3D"EN-US" st=
yle=3D"color:black"> if one /128 represents an IPv6 interface, as described
 in RFC 4291, all /128 MUST either:</span></b><span lang=3D"EN-US"><u></u><=
u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:black">=C2=A0=
</span></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<b><span lang=3D"EN-US" style=3D"color:black">Represent an IPv6 interface, =
as described in RFC 4291, or</span></b><span lang=3D"EN-US"><u></u><u></u><=
/span></li><li class=3D"MsoNormal">
<b><span lang=3D"EN-US" style=3D"color:black">Be unassigned=E2=80=9D</span>=
</b><span lang=3D"EN-US"><u></u><u></u></span></li></ul>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">But then you sent this to SPRIN=
T indicating that 6MAN should be the audience :).=C2=A0<u></u><u></u></span=
></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best,<br>
R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Mon, Oct 14, 2019 at 12:45 A=
M Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" rel=3D"noreferrer n=
oreferrer" target=3D"_blank">rbonica@juniper.net</a>&gt; wrote:<u></u><u></=
u></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Robert,<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I=E2=80=99m having a hard time =
understanding exactly how I have violated the longest match principle. Coul=
d you provide:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li>
<span lang=3D"EN-US">A pointer to a statement of the longest match principl=
e<u></u><u></u></span></li><li>
<span lang=3D"EN-US">A few words regarding how I have violated it<u></u><u>=
</u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" rel=3D"n=
oreferrer noreferrer" target=3D"_blank">robert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 5:24 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" rel=3D"nor=
eferrer noreferrer" target=3D"_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" rel=3D"nor=
eferrer noreferrer" target=3D"_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> IPv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Ron,<u></u><u></u></span></p=
>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I disagree.=C2=A0<u></u><u></u>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Your suggestion violates=C2=A0l=
ongest prefix match principle in routing.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It is huge waist of address spa=
ce and is not specific to IPv6 at all.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Let me describe the deployment =
case where your suggestion=C2=A0would cause it to break:=C2=A0<u></u><u></u=
></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have /64 prefix where a few=
=C2=A0 /128s from that space I allocate to local interfaces making it a loc=
al v6 destinations on those nodes.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">However in the spirit of CIDR I=
 still want to to use some blocks of that space - say=C2=A0 /126 or /124 as=
 blocks which I only use to trigger local NAT as per=C2=A0rfc6296.
 And NAT does not require local address to be a destination address so it w=
ould be a big disservice to kill such deployment option.=C2=A0<u></u><u></u=
></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Many thx,<br>
R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Sun, Oct 13, 2019 at 10:59 P=
M Ron Bonica &lt;rbonica=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org" =
rel=3D"noreferrer noreferrer" target=3D"_blank">40juniper.net@dmarc.ietf.or=
g</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Folks,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I think that we need a global r=
ule that says:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=E2=80=9CWith a /64, if one /12=
8 represents an IPv6 interface, as described in RFC 4291, all /128 MUST eit=
her:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span lang=3D"EN-US">Represent an IPv6 interface, as described in RFC 4291,=
 or<u></u><u></u></span></li><li class=3D"MsoNormal">
<span lang=3D"EN-US">Be unassigned=E2=80=9D<u></u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The 6man WG will need to make s=
uch a statement since it owns RFC 4291.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p align=3D"center" style=3D"margin:0cm;margin-bottom:.0001pt;text-align:ce=
nter">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p align=3D"center" style=3D"margin:0cm;margin-bottom:.0001pt;text-align:ce=
nter">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><u></u><u></u></span></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>

_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" rel=3D"noreferrer noreferrer" target=3D"=
_blank">spring@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer =
noreferrer noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listi=
nfo/spring</a><br>
</blockquote></div></div></div>

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From: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
To: SPRING WG List <spring@ietf.org>
Thread-Topic: questions about draft-filsfils-spring-net-pgm-extension-srv6-usid-02
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Hi folks:

I have read through the micro-SID draft, and a confusion arise in my mind, =
the example in this draft only illustrate how the uSID carrier operate usin=
g Node-SRv6-SID, not including SRv6 SID representing Adj-SID. that is to sa=
y the uSID carrier only encoding Node-SRv6-SID in this draft, Is this right=
 from my understanding to this draft?
As of one Node can have lots of IPv6 interfaces, so we must have lots of SR=
v6 SIDs representing these interfaces respectively, as a result lots of SRv=
6 SIDs May be reserved for this purpose. I don't see the author clearly org=
anize these Adj-SIDs; I think we can further divide uSID, for example, if 2=
 bytes represent uSID, the first byte May identify Node itself, and the 2nd=
 byte identify interface link (Adj-SID), so following the example in this d=
raft, 2001:db8/16 representing uSID block, every prefix 2001:db8:xx00/24 ca=
n be allocated to a Node, and 2001:db8:xxyy::/32 can be assigned to SRv6 SI=
Ds representing Node-SID or Adj-SID within the Node. So the Node only adver=
tise 2001:db8:xx00::/24 prefix by IGP or BGP SR-extension, need not adverti=
se lots of /32 for SIDs instantiated within this Node , the other Node with=
in SRv6 domain can have lots of /24 routes which can route packets to targe=
t Node, it's table lookup is still according to longest-prefix-match.
Another question about SRv6 SID significant-scope, I think TE function is o=
ne main application of SRv6, topology SRv6 SIDs including Node-prefix-SID a=
nd Adj-SID have local significant within SRv6 domain controlled by one orga=
nization (operator), the SIDs only assist the operator to control and steer=
ing traffic within its controlled domain, these SRv6 SIDs need not have mea=
ningful outside the domain, so these type of SRv6 SIDs must be not leaked o=
utside of SRv6 domain, doing that is also helpful for security against DDOS=
. But the service SRv6 SIDs such as End.DT4 or DT6 etc. advertised by MP-BG=
P extension is not same with above topology SIDs, because the VPN service i=
dentified by END.DT4/6 My be across several ASes controlled by different op=
erators, So service SIDs such as END.DT4/6 May be global significant within=
 open-internet-wide.


--------------------------------------
Cheers !


WANG Weibin


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi folks:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have read through the micro-S=
ID draft, and a confusion arise in my mind, the example in this draft only =
illustrate how the uSID carrier operate using Node-SRv6-SID, not including =
SRv6 SID representing Adj-SID. that
 is to say the uSID carrier only encoding Node-SRv6-SID in this draft, Is t=
his right from my understanding to this draft?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">As of one Node can have lots of=
 IPv6 interfaces, so we must have lots of SRv6 SIDs representing these inte=
rfaces respectively, as a result lots of SRv6 SIDs May be reserved for this=
 purpose. I don&#8217;t see the author clearly
 organize these Adj-SIDs; I think we can further divide uSID, for example, =
if 2 bytes represent uSID, the first byte May identify Node itself, and the=
 2<sup>nd</sup> byte identify interface link (Adj-SID), so following the ex=
ample in this draft, 2001:db8/16
 representing uSID block, every prefix 2001:db8:xx00/24 can be allocated to=
 a Node, and 2001:db8:xxyy::/32 can be assigned to SRv6 SIDs representing N=
ode-SID or Adj-SID within the Node. So the Node only advertise 2001:db8:xx0=
0::/24 prefix by IGP or BGP SR-extension,
 need not advertise lots of /32 for SIDs instantiated within this Node , th=
e other Node within SRv6 domain can have lots of /24 routes which can route=
 packets to target Node, it&#8217;s table lookup is still according to long=
est-prefix-match.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Another question about SRv6 SID=
 significant-scope, I think TE function is one main application of SRv6, to=
pology SRv6 SIDs including Node-prefix-SID and Adj-SID have local significa=
nt within SRv6 domain controlled by
 one organization (operator), the SIDs only assist the operator to control =
and steering traffic within its controlled domain, these SRv6 SIDs need not=
 have meaningful outside the domain, so these type of SRv6 SIDs must be not=
 leaked outside of SRv6 domain,
 doing that is also helpful for security against DDOS. But the service SRv6=
 SIDs such as End.DT4 or DT6 etc. advertised by MP-BGP extension is not sam=
e with above topology SIDs, because the VPN service identified by END.DT4/6=
 My be across several ASes controlled
 by different operators, So service SIDs such as END.DT4/6 May be global si=
gnificant within open-internet-wide.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-------------------------------=
-------<o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span lang=3D"EN-US" style=3D"font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-family:&quot;Times New Roman&=
quot;,serif"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</body>
</html>

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In-Reply-To: <5ae3ab05035f439db46fe5126b1476db@nokia-sbell.com>
From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Mon, 14 Oct 2019 10:12:39 -0400
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To: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
Cc: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, Robert Raszuk <robert@raszuk.net>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] IPv6 Addresses and SIDs
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On Mon, Oct 14, 2019 at 1:45 AM Wang, Weibin (NSB - CN/Shanghai) <
weibin.wang@nokia-sbell.com> wrote:

> Hi Ron:
>
>
>
> Make sense, If there is a dedicated IPv6 block for SRv6 SID within SRv6
> domain, then trouble situation you described does NOT occur, because the
> IPv6 address covered within SRv6 SID prefix does not be involved ICMPv6 N=
D
> protocol, because they are not configured under IP interfaces connected t=
o
> =E2=80=9CLink=E2=80=9D.  I also think that the authors of NET-PGM draft h=
ave indicated that
> SRv6 SID has a separate IPv6 block in their Draft, but they don=E2=80=99t=
 yet
> clearly stated which IPv6 block will be used for it.
>
>
>
>  [Gyan] I agree with what you are saying that if we allocate a separate
> /64 block GUA or ULA for SID for each node within the SR domain and that =
is
> separate from interface addressing ranges and is completely dedicated to
> SID.  So this would prevent any conflict with ND NS/NA processing.  Makes
> sense.  We are addressing the violation to the 6MAN RFC 8200 in draft bel=
ow
> which was rewritten  and does look better with the addition of
> encapsulation but really need to provide an additional IPv6 encapsulation
> every time a EH is inserted "in flight" to be 100% compliant with the IPv=
6
> specification.   Since SRv6  ubiquitous in nature and can be used for any
> implementation where traffic engineering is necessary when you go
> inter-domain between administrative control it maybe difficult to enforce
> or have either the PSP & USP occur outside of the originating SRv6 domain
> that inserted the 1st EH header which the main use case that would be
> difficult is the "internet" use case.  If we cannot come up with a soluti=
on
> for that we would have to exclude the internet or any inter-domain SRv6
> implementations from using SRv6 from a standards track perspective.
>

https://datatracker.ietf.org/doc/draft-voyer-6man-extension-header-insertio=
n/


> --------------------------------------
>
> *Cheers !*
>
>
>
>
>
> *WANG Weibin  *
>
>
>
> *From:* spring <spring-bounces@ietf.org> *On Behalf Of *Ron Bonica
> *Sent:* 2019=E5=B9=B410=E6=9C=8814=E6=97=A5 9:23
> *To:* Robert Raszuk <robert@raszuk.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* Re: [spring] IPv6 Addresses and SIDs
>
>
>
> Robert,
>
>
>
> Yeah, there were a few typos in my original message. What I meant to say
> was:
>
>
>
>    - If a /64 contains a SID, it MUST NOT contain any addresses that
>    represent interfaces.
>    - If a /64 contains an address that represents an interface, it MUST
>    NOT contain SIDs.
>
>
>
> If we don=E2=80=99t do this, we have to specify how nodes behave when the=
y receive
> ICMPv6 NS messages in which the target is:
>
>
>
>    - A locally instantiated SID
>    - A SID learned from the IGP
>
>
>
>                                                                       Ron
>
>
>
>
>
> *From:* Robert Raszuk <robert@raszuk.net>
> *Sent:* Sunday, October 13, 2019 6:57 PM
> *To:* Ron Bonica <rbonica@juniper.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* Re: IPv6 Addresses and SIDs
>
>
>
> Hi Ron,
>
>
>
> /64 prefix is a pile of addresses ... if someone would be to follow your
> suggestion I could not allocate some blocks of that prefix on R1, then so=
me
> other blocks on R2 then yet more on my servers.
>
>
>
> You said:
>
>
>
> *=E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as descri=
bed in
> RFC 4291, all /128 MUST either:*
>
>
>
>    - *Represent an IPv6 interface, as described in RFC 4291, or*
>    - *Be unassigned=E2=80=9D*
>
>
>
> Maybe you meant to say something else:
>
>
>
> *=E2=80=9CWhen a /64 is used as SRv6 locator prefix, if one /128 represen=
ts an
> IPv6 interface, as described in RFC 4291, all /128 MUST either:*
>
>
>
>    - *Represent an IPv6 interface, as described in RFC 4291, or*
>    - *Be unassigned=E2=80=9D*
>
> But then you sent this to SPRINT indicating that 6MAN should be the
> audience :).
>
>
>
> Best,
> R.
>
>
>
>
>
> On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica <rbonica@juniper.net> wrote:
>
> Robert,
>
>
>
> I=E2=80=99m having a hard time understanding exactly how I have violated =
the
> longest match principle. Could you provide:
>
>
>
>    - A pointer to a statement of the longest match principle
>    - A few words regarding how I have violated it
>
>
>
>                                                               Ron
>
>
>
>
>
> *From:* Robert Raszuk <robert@raszuk.net>
> *Sent:* Sunday, October 13, 2019 5:24 PM
> *To:* Ron Bonica <rbonica@juniper.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* IPv6 Addresses and SIDs
>
>
>
> Hi Ron,
>
>
>
> I disagree.
>
>
>
> Your suggestion violates longest prefix match principle in routing.
>
>
>
> It is huge waist of address space and is not specific to IPv6 at all.
>
>
>
> Let me describe the deployment case where your suggestion would cause it
> to break:
>
>
>
> I have /64 prefix where a few  /128s from that space I allocate to local
> interfaces making it a local v6 destinations on those nodes.
>
>
>
> However in the spirit of CIDR I still want to to use some blocks of that
> space - say  /126 or /124 as blocks which I only use to trigger local NAT
> as per rfc6296. And NAT does not require local address to be a destinatio=
n
> address so it would be a big disservice to kill such deployment option.
>
>
>
> Many thx,
> R.
>
>
>
>
>
> On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D
> 40juniper.net@dmarc.ietf.org> wrote:
>
> Folks,
>
>
>
> I think that we need a global rule that says:
>
>
>
> =E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as describ=
ed in RFC
> 4291, all /128 MUST either:
>
>
>
>    - Represent an IPv6 interface, as described in RFC 4291, or
>    - Be unassigned=E2=80=9D
>
>
>
> The 6man WG will need to make such a statement since it owns RFC 4291.
>
>
>
>                                                              Ron
>
>
>
> Juniper Business Use Only
>
>
>
> Juniper Business Use Only
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>


--=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

--0000000000009cb72a0594df76a2
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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Mon, Oct 14, 2019 at 1:45 AM Wang,=
 Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.c=
om">weibin.wang@nokia-sbell.com</a>&gt; wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">





<div lang=3D"ZH-CN">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Hi R=
on:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Make=
 sense, If there is a dedicated IPv6 block for SRv6 SID within SRv6 domain,=
 then trouble situation you described does NOT occur, because the IPv6 addr=
ess covered within SRv6 SID prefix does
 not be involved ICMPv6 ND protocol, because they are not configured under =
IP interfaces connected to =E2=80=9CLink=E2=80=9D.=C2=A0 I also think that =
the authors of NET-PGM draft have indicated that SRv6 SID has a separate IP=
v6 block in their Draft, but they don=E2=80=99t yet clearly stated
 which IPv6 block will be used for it. <u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0[Gyan] I agree with what you are saying that if we allocate a sepa=
rate /64 block GUA or ULA for SID for each node within the SR domain and th=
at is separate from interface addressing ranges and is completely dedicated=
 to SID.=C2=A0 So this would prevent any conflict with ND NS/NA processing.=
=C2=A0 Makes sense.=C2=A0 We are addressing the violation to the 6MAN RFC 8=
200 in draft below which was rewritten=C2=A0 and does look better with the =
addition of encapsulation but really need to provide an additional IPv6 enc=
apsulation every time a EH is inserted &quot;in flight&quot; to be 100% com=
pliant with the IPv6 specification.=C2=A0 =C2=A0Since SRv6=C2=A0 ubiquitous=
 in nature and can be used for any implementation where traffic engineering=
 is necessary when you go inter-domain between administrative control it ma=
ybe difficult to enforce or have either the PSP &amp; USP occur outside of =
the originating SRv6 domain that inserted the 1st EH header which the main =
use case that would be difficult is the &quot;internet&quot; use case.=C2=
=A0 If we cannot come up with a solution for that we would have to exclude =
the internet or any inter-domain SRv6 implementations from using SRv6 from =
a standards track perspective.=C2=A0 =C2=A0</span></p></div></div></blockqu=
ote><div>=C2=A0</div><div><a href=3D"https://datatracker.ietf.org/doc/draft=
-voyer-6man-extension-header-insertion/">https://datatracker.ietf.org/doc/d=
raft-voyer-6man-extension-header-insertion/</a></div><div>=C2=A0</div><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:=
1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"ZH-CN"><div><p cl=
ass=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u></u></=
span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt">--------------------------------------<u></u><u></=
u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><i><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,serif">C=
heers !<u></u><u></u></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><b><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:Arial,sans-serif"><u></u>=C2=A0<u></=
u></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><b><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,serif">W=
ANG Weibin=C2=A0
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0<u></u></span></p>
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" target=3D=
"_blank">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=9B=
=85=E9=BB=91,sans-serif">=E5=B9=B4</span><span lang=3D"EN-US">10</span><spa=
n style=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91,sans-serif">=E6=
=9C=88</span><span lang=3D"EN-US">14</span><span style=3D"font-family:=E5=
=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91,sans-serif">=E6=97=A5</span><span lang=3D=
"EN-US"> 9:23<br>
<b>To:</b> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D=
"_blank">robert@raszuk.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] IPv6 Addresses and SIDs<u></u><u></u></span></=
p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Robert,<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yeah, there were a few typos in=
 my original message. What I meant to say was:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li style=3D"margin-left:0cm"><span lang=3D"EN-US">If a /64 contains a SID,=
 it MUST NOT contain any addresses that represent interfaces.<u></u><u></u>=
</span></li><li style=3D"margin-left:0cm"><span lang=3D"EN-US">If a /64 con=
tains an address that represents an interface, it MUST NOT contain SIDs.<u>=
</u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If we don=E2=80=99t do this, we=
 have to specify how nodes behave when they receive ICMPv6 NS messages in w=
hich the target is:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li style=3D"margin-left:0cm"><span lang=3D"EN-US">A locally instantiated S=
ID<u></u><u></u></span></li><li style=3D"margin-left:0cm"><span lang=3D"EN-=
US">A SID learned from the IGP<u></u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=
=3D"_blank">robert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 6:57 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: IPv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Ron,<u></u><u></u></span></p=
>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">/64 prefix is a pile of address=
es ... if someone would be to follow your suggestion I could not allocate s=
ome blocks of that prefix on R1, then some other blocks on R2 then yet more=
 on my servers.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You said:=C2=A0<u></u><u></u></=
span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">=E2=80=9CWith a /64, if one =
/128 represents an IPv6 interface, as described in RFC 4291, all /128 MUST =
either:</span></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">=C2=A0</span></b><span lang=
=3D"EN-US"><u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<b><span lang=3D"EN-US">Represent an IPv6 interface, as described in RFC 42=
91, or</span></b><span lang=3D"EN-US"><u></u><u></u></span></li><li class=
=3D"MsoNormal">
<b><span lang=3D"EN-US">Be unassigned=E2=80=9D</span></b><span lang=3D"EN-U=
S"><u></u><u></u></span></li></ul>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Maybe you meant to say somethin=
g else:=C2=A0<u></u><u></u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:red">=E2=80=
=9CWhen a /64 is used as SRv6 locator prefix,</span><span lang=3D"EN-US" st=
yle=3D"color:black"> if one /128 represents an IPv6 interface, as described
 in RFC 4291, all /128 MUST either:</span></b><span lang=3D"EN-US"><u></u><=
u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:black">=C2=A0=
</span></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<b><span lang=3D"EN-US" style=3D"color:black">Represent an IPv6 interface, =
as described in RFC 4291, or</span></b><span lang=3D"EN-US"><u></u><u></u><=
/span></li><li class=3D"MsoNormal">
<b><span lang=3D"EN-US" style=3D"color:black">Be unassigned=E2=80=9D</span>=
</b><span lang=3D"EN-US"><u></u><u></u></span></li></ul>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">But then you sent this to SPRIN=
T indicating that 6MAN should be the audience :).=C2=A0<u></u><u></u></span=
></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best,<br>
R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Mon, Oct 14, 2019 at 12:45 A=
M Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_blank">r=
bonica@juniper.net</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Robert,<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I=E2=80=99m having a hard time =
understanding exactly how I have violated the longest match principle. Coul=
d you provide:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li>
<span lang=3D"EN-US">A pointer to a statement of the longest match principl=
e<u></u><u></u></span></li><li>
<span lang=3D"EN-US">A few words regarding how I have violated it<u></u><u>=
</u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=
=3D"_blank">robert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 5:24 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> IPv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Ron,<u></u><u></u></span></p=
>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I disagree.=C2=A0<u></u><u></u>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Your suggestion violates=C2=A0l=
ongest prefix match principle in routing.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It is huge waist of address spa=
ce and is not specific to IPv6 at all.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Let me describe the deployment =
case where your suggestion=C2=A0would cause it to break:=C2=A0<u></u><u></u=
></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have /64 prefix where a few=
=C2=A0 /128s from that space I allocate to local interfaces making it a loc=
al v6 destinations on those nodes.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">However in the spirit of CIDR I=
 still want to to use some blocks of that space - say=C2=A0 /126 or /124 as=
 blocks which I only use to trigger local NAT as per=C2=A0rfc6296.
 And NAT does not require local address to be a destination address so it w=
ould be a big disservice to kill such deployment option.=C2=A0<u></u><u></u=
></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Many thx,<br>
R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Sun, Oct 13, 2019 at 10:59 P=
M Ron Bonica &lt;rbonica=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org" =
target=3D"_blank">40juniper.net@dmarc.ietf.org</a>&gt; wrote:<u></u><u></u>=
</span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Folks,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I think that we need a global r=
ule that says:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=E2=80=9CWith a /64, if one /12=
8 represents an IPv6 interface, as described in RFC 4291, all /128 MUST eit=
her:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span lang=3D"EN-US">Represent an IPv6 interface, as described in RFC 4291,=
 or<u></u><u></u></span></li><li class=3D"MsoNormal">
<span lang=3D"EN-US">Be unassigned=E2=80=9D<u></u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The 6man WG will need to make s=
uch a statement since it owns RFC 4291.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p align=3D"center" style=3D"margin:0cm 0cm 0.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7pt;color:black">Juniper Business U=
se Only</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p align=3D"center" style=3D"margin:0cm 0cm 0.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7pt;color:black">Juniper Business U=
se Only</span><span lang=3D"EN-US"><u></u><u></u></span></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>

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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Mon, 14 Oct 2019 10:26:43 -0400
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To: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
Cc: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, Robert Raszuk <robert@raszuk.net>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] IPv6 Addresses and SIDs
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On Mon, Oct 14, 2019 at 10:12 AM Gyan Mishra <hayabusagsm@gmail.com> wrote:

>
>
> On Mon, Oct 14, 2019 at 1:45 AM Wang, Weibin (NSB - CN/Shanghai) <
> weibin.wang@nokia-sbell.com> wrote:
>
>> Hi Ron:
>>
>>
>>
>> Make sense, If there is a dedicated IPv6 block for SRv6 SID within SRv6
>> domain, then trouble situation you described does NOT occur, because the
>> IPv6 address covered within SRv6 SID prefix does not be involved ICMPv6 =
ND
>> protocol, because they are not configured under IP interfaces connected =
to
>> =E2=80=9CLink=E2=80=9D.  I also think that the authors of NET-PGM draft =
have indicated that
>> SRv6 SID has a separate IPv6 block in their Draft, but they don=E2=80=99=
t yet
>> clearly stated which IPv6 block will be used for it.
>>
>>
>>
>>  [Gyan] I agree with what you are saying that if we allocate a separate
>> /64 block GUA or ULA for SID for each node within the SR domain and that=
 is
>> separate from interface addressing ranges and is completely dedicated to
>> SID.  So this would prevent any conflict with ND NS/NA processing.  Make=
s
>> sense.  We are addressing the violation to the 6MAN RFC 8200 in draft be=
low
>> which was rewritten  and does look better with the addition of
>> encapsulation but really need to provide an additional IPv6 encapsulatio=
n
>> every time a EH is inserted "in flight" to be 100% compliant with the IP=
v6
>> specification.   Since SRv6  ubiquitous in nature and can be used for an=
y
>> implementation where traffic engineering is necessary when you go
>> inter-domain between administrative control it maybe difficult to enforc=
e
>> or have either the PSP & USP occur outside of the originating SRv6 domai=
n
>> that inserted the 1st EH header which the main use case that would be
>> difficult is the "internet" use case.  If we cannot come up with a solut=
ion
>> for that we would have to exclude the internet or any inter-domain SRv6
>> implementations from using SRv6 from a standards track perspective.
>>
>
>
> https://datatracker.ietf.org/doc/draft-voyer-6man-extension-header-insert=
ion/
>
>
>> --------------------------------------
>>
>> *Cheers !*
>>
>>  [Gyan]  Spring WG  -??  Because SRv6 uses the same IPv6 data plan as
>> "Business as Usual" NORMAL IPv6 traffic use case of the "internet"  so
>> the an "SRv6 enabled router" that has the code that supports SRv6 has th=
e
>> software feature to perform the PSP & USP but lets say the packet hits a
>> node that does not support SRv6 then the PSP & USP won't occur and all t=
he
>> EH headers inserted for SRv6 routing header type 4 will remain in the
>> packet to the end destination.   How do we deal with this issue.
>>
>
>>
>> *WANG Weibin  *
>>
>>
>>
>> *From:* spring <spring-bounces@ietf.org> *On Behalf Of *Ron Bonica
>> *Sent:* 2019=E5=B9=B410=E6=9C=8814=E6=97=A5 9:23
>> *To:* Robert Raszuk <robert@raszuk.net>
>> *Cc:* SPRING WG List <spring@ietf.org>
>> *Subject:* Re: [spring] IPv6 Addresses and SIDs
>>
>>
>>
>> Robert,
>>
>>
>>
>> Yeah, there were a few typos in my original message. What I meant to say
>> was:
>>
>>
>>
>>    - If a /64 contains a SID, it MUST NOT contain any addresses that
>>    represent interfaces.
>>    - If a /64 contains an address that represents an interface, it MUST
>>    NOT contain SIDs.
>>
>>
>>
>> If we don=E2=80=99t do this, we have to specify how nodes behave when th=
ey
>> receive ICMPv6 NS messages in which the target is:
>>
>>
>>
>>    - A locally instantiated SID
>>    - A SID learned from the IGP
>>
>>
>>
>>                                                                       Ro=
n
>>
>>
>>
>>
>>
>> *From:* Robert Raszuk <robert@raszuk.net>
>> *Sent:* Sunday, October 13, 2019 6:57 PM
>> *To:* Ron Bonica <rbonica@juniper.net>
>> *Cc:* SPRING WG List <spring@ietf.org>
>> *Subject:* Re: IPv6 Addresses and SIDs
>>
>>
>>
>> Hi Ron,
>>
>>
>>
>> /64 prefix is a pile of addresses ... if someone would be to follow your
>> suggestion I could not allocate some blocks of that prefix on R1, then s=
ome
>> other blocks on R2 then yet more on my servers.
>>
>>
>>
>> You said:
>>
>>
>>
>> *=E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as descr=
ibed in
>> RFC 4291, all /128 MUST either:*
>>
>>
>>
>>    - *Represent an IPv6 interface, as described in RFC 4291, or*
>>    - *Be unassigned=E2=80=9D*
>>
>>
>>
>> Maybe you meant to say something else:
>>
>>
>>
>> *=E2=80=9CWhen a /64 is used as SRv6 locator prefix, if one /128 represe=
nts an
>> IPv6 interface, as described in RFC 4291, all /128 MUST either:*
>>
>>
>>
>>    - *Represent an IPv6 interface, as described in RFC 4291, or*
>>    - *Be unassigned=E2=80=9D*
>>
>> But then you sent this to SPRINT indicating that 6MAN should be the
>> audience :).
>>
>>
>>
>> Best,
>> R.
>>
>>
>>
>>
>>
>> On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica <rbonica@juniper.net> wrote:
>>
>> Robert,
>>
>>
>>
>> I=E2=80=99m having a hard time understanding exactly how I have violated=
 the
>> longest match principle. Could you provide:
>>
>>
>>
>>    - A pointer to a statement of the longest match principle
>>    - A few words regarding how I have violated it
>>
>>
>>
>>                                                               Ron
>>
>>
>>
>>
>>
>> *From:* Robert Raszuk <robert@raszuk.net>
>> *Sent:* Sunday, October 13, 2019 5:24 PM
>> *To:* Ron Bonica <rbonica@juniper.net>
>> *Cc:* SPRING WG List <spring@ietf.org>
>> *Subject:* IPv6 Addresses and SIDs
>>
>>
>>
>> Hi Ron,
>>
>>
>>
>> I disagree.
>>
>>
>>
>> Your suggestion violates longest prefix match principle in routing.
>>
>>
>>
>> It is huge waist of address space and is not specific to IPv6 at all.
>>
>>
>>
>> Let me describe the deployment case where your suggestion would cause it
>> to break:
>>
>>
>>
>> I have /64 prefix where a few  /128s from that space I allocate to local
>> interfaces making it a local v6 destinations on those nodes.
>>
>>
>>
>> However in the spirit of CIDR I still want to to use some blocks of that
>> space - say  /126 or /124 as blocks which I only use to trigger local NA=
T
>> as per rfc6296. And NAT does not require local address to be a destinati=
on
>> address so it would be a big disservice to kill such deployment option.
>>
>>
>>
>> Many thx,
>> R.
>>
>>
>>
>>
>>
>> On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D
>> 40juniper.net@dmarc.ietf.org> wrote:
>>
>> Folks,
>>
>>
>>
>> I think that we need a global rule that says:
>>
>>
>>
>> =E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as descri=
bed in
>> RFC 4291, all /128 MUST either:
>>
>>
>>
>>    - Represent an IPv6 interface, as described in RFC 4291, or
>>    - Be unassigned=E2=80=9D
>>
>>
>>
>> The 6man WG will need to make such a statement since it owns RFC 4291.
>>
>>
>>
>>                                                              Ron
>>
>>
>>
>> Juniper Business Use Only
>>
>>
>>
>> Juniper Business Use Only
>>
>> _______________________________________________
>> spring mailing list
>> spring@ietf.org
>> https://www.ietf.org/mailman/listinfo/spring
>>
>
>
> --
>
> 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
>
>

--=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

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

<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Mon, Oct 14, 2019 at 10:12 AM Gyan=
 Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.com">hayabusagsm@gmail.com<=
/a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0=
px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><=
div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote"><=
div dir=3D"ltr" class=3D"gmail_attr">On Mon, Oct 14, 2019 at 1:45 AM Wang, =
Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.co=
m" target=3D"_blank">weibin.wang@nokia-sbell.com</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"ZH-CN">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Hi R=
on:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Make=
 sense, If there is a dedicated IPv6 block for SRv6 SID within SRv6 domain,=
 then trouble situation you described does NOT occur, because the IPv6 addr=
ess covered within SRv6 SID prefix does
 not be involved ICMPv6 ND protocol, because they are not configured under =
IP interfaces connected to =E2=80=9CLink=E2=80=9D.=C2=A0 I also think that =
the authors of NET-PGM draft have indicated that SRv6 SID has a separate IP=
v6 block in their Draft, but they don=E2=80=99t yet clearly stated
 which IPv6 block will be used for it. <u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0[Gyan] I agree with what you are saying that if we allocate a sepa=
rate /64 block GUA or ULA for SID for each node within the SR domain and th=
at is separate from interface addressing ranges and is completely dedicated=
 to SID.=C2=A0 So this would prevent any conflict with ND NS/NA processing.=
=C2=A0 Makes sense.=C2=A0 We are addressing the violation to the 6MAN RFC 8=
200 in draft below which was rewritten=C2=A0 and does look better with the =
addition of encapsulation but really need to provide an additional IPv6 enc=
apsulation every time a EH is inserted &quot;in flight&quot; to be 100% com=
pliant with the IPv6 specification.=C2=A0 =C2=A0Since SRv6=C2=A0 ubiquitous=
 in nature and can be used for any implementation where traffic engineering=
 is necessary when you go inter-domain between administrative control it ma=
ybe difficult to enforce or have either the PSP &amp; USP occur outside of =
the originating SRv6 domain that inserted the 1st EH header which the main =
use case that would be difficult is the &quot;internet&quot; use case.=C2=
=A0 If we cannot come up with a solution for that we would have to exclude =
the internet or any inter-domain SRv6 implementations from using SRv6 from =
a standards track perspective.=C2=A0 =C2=A0</span></p></div></div></blockqu=
ote><div>=C2=A0</div><div><a href=3D"https://datatracker.ietf.org/doc/draft=
-voyer-6man-extension-header-insertion/" target=3D"_blank">https://datatrac=
ker.ietf.org/doc/draft-voyer-6man-extension-header-insertion/</a></div><div=
>=C2=A0</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"><div lang=3D=
"ZH-CN"><div><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size=
:10.5pt"><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt">--------------------------------------<u></u><u></=
u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><i><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,serif">C=
heers !<u></u><u></u></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt"><u></u>=C2=A0[Gyan]=C2=A0 Spring WG=C2=A0 -??=C2=
=A0 Because SRv6 uses the same IPv6 data plan as &quot;Business as Usual&qu=
ot; NORMAL IPv6 traffic use case of the &quot;internet&quot;=C2=A0</span><s=
pan style=3D"font-size:10.5pt">=C2=A0so the an &quot;SRv6 enabled router&qu=
ot; that has the code that supports SRv6 has the software feature to perfor=
m the PSP &amp; USP but lets say the packet hits a node that does not suppo=
rt SRv6 then the PSP &amp; USP won&#39;t occur and all the EH headers inser=
ted for SRv6 routing header type 4 will remain in the packet to the end des=
tination.=C2=A0 =C2=A0How do we deal with this issue.</span></p></div></div=
></div></blockquote></div></div></blockquote><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_quote"><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex"><div lang=3D"ZH-CN"><div><div>
<p class=3D"MsoNormal" style=3D"text-align:justify"><b><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:Arial,sans-serif"><u></u>=C2=A0<u></=
u></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify"><b><span lang=3D"EN-US"=
 style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,serif">W=
ANG Weibin=C2=A0
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><u><=
/u>=C2=A0<u></u></span></p>
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" target=3D=
"_blank">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=9B=
=85=E9=BB=91,sans-serif">=E5=B9=B4</span><span lang=3D"EN-US">10</span><spa=
n style=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91,sans-serif">=E6=
=9C=88</span><span lang=3D"EN-US">14</span><span style=3D"font-family:=E5=
=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91,sans-serif">=E6=97=A5</span><span lang=3D=
"EN-US"> 9:23<br>
<b>To:</b> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D=
"_blank">robert@raszuk.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] IPv6 Addresses and SIDs<u></u><u></u></span></=
p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Robert,<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yeah, there were a few typos in=
 my original message. What I meant to say was:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li style=3D"margin-left:0cm"><span lang=3D"EN-US">If a /64 contains a SID,=
 it MUST NOT contain any addresses that represent interfaces.<u></u><u></u>=
</span></li><li style=3D"margin-left:0cm"><span lang=3D"EN-US">If a /64 con=
tains an address that represents an interface, it MUST NOT contain SIDs.<u>=
</u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If we don=E2=80=99t do this, we=
 have to specify how nodes behave when they receive ICMPv6 NS messages in w=
hich the target is:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li style=3D"margin-left:0cm"><span lang=3D"EN-US">A locally instantiated S=
ID<u></u><u></u></span></li><li style=3D"margin-left:0cm"><span lang=3D"EN-=
US">A SID learned from the IGP<u></u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=
=3D"_blank">robert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 6:57 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: IPv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Ron,<u></u><u></u></span></p=
>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">/64 prefix is a pile of address=
es ... if someone would be to follow your suggestion I could not allocate s=
ome blocks of that prefix on R1, then some other blocks on R2 then yet more=
 on my servers.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You said:=C2=A0<u></u><u></u></=
span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">=E2=80=9CWith a /64, if one =
/128 represents an IPv6 interface, as described in RFC 4291, all /128 MUST =
either:</span></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">=C2=A0</span></b><span lang=
=3D"EN-US"><u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<b><span lang=3D"EN-US">Represent an IPv6 interface, as described in RFC 42=
91, or</span></b><span lang=3D"EN-US"><u></u><u></u></span></li><li class=
=3D"MsoNormal">
<b><span lang=3D"EN-US">Be unassigned=E2=80=9D</span></b><span lang=3D"EN-U=
S"><u></u><u></u></span></li></ul>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Maybe you meant to say somethin=
g else:=C2=A0<u></u><u></u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:red">=E2=80=
=9CWhen a /64 is used as SRv6 locator prefix,</span><span lang=3D"EN-US" st=
yle=3D"color:black"> if one /128 represents an IPv6 interface, as described
 in RFC 4291, all /128 MUST either:</span></b><span lang=3D"EN-US"><u></u><=
u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:black">=C2=A0=
</span></b><span lang=3D"EN-US"><u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<b><span lang=3D"EN-US" style=3D"color:black">Represent an IPv6 interface, =
as described in RFC 4291, or</span></b><span lang=3D"EN-US"><u></u><u></u><=
/span></li><li class=3D"MsoNormal">
<b><span lang=3D"EN-US" style=3D"color:black">Be unassigned=E2=80=9D</span>=
</b><span lang=3D"EN-US"><u></u><u></u></span></li></ul>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">But then you sent this to SPRIN=
T indicating that 6MAN should be the audience :).=C2=A0<u></u><u></u></span=
></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best,<br>
R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Mon, Oct 14, 2019 at 12:45 A=
M Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_blank">r=
bonica@juniper.net</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Robert,<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I=E2=80=99m having a hard time =
understanding exactly how I have violated the longest match principle. Coul=
d you provide:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li>
<span lang=3D"EN-US">A pointer to a statement of the longest match principl=
e<u></u><u></u></span></li><li>
<span lang=3D"EN-US">A few words regarding how I have violated it<u></u><u>=
</u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=
=3D"_blank">robert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 5:24 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> IPv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Ron,<u></u><u></u></span></p=
>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I disagree.=C2=A0<u></u><u></u>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Your suggestion violates=C2=A0l=
ongest prefix match principle in routing.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It is huge waist of address spa=
ce and is not specific to IPv6 at all.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Let me describe the deployment =
case where your suggestion=C2=A0would cause it to break:=C2=A0<u></u><u></u=
></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have /64 prefix where a few=
=C2=A0 /128s from that space I allocate to local interfaces making it a loc=
al v6 destinations on those nodes.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">However in the spirit of CIDR I=
 still want to to use some blocks of that space - say=C2=A0 /126 or /124 as=
 blocks which I only use to trigger local NAT as per=C2=A0rfc6296.
 And NAT does not require local address to be a destination address so it w=
ould be a big disservice to kill such deployment option.=C2=A0<u></u><u></u=
></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Many thx,<br>
R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Sun, Oct 13, 2019 at 10:59 P=
M Ron Bonica &lt;rbonica=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org" =
target=3D"_blank">40juniper.net@dmarc.ietf.org</a>&gt; wrote:<u></u><u></u>=
</span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Folks,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I think that we need a global r=
ule that says:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=E2=80=9CWith a /64, if one /12=
8 represents an IPv6 interface, as described in RFC 4291, all /128 MUST eit=
her:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span lang=3D"EN-US">Represent an IPv6 interface, as described in RFC 4291,=
 or<u></u><u></u></span></li><li class=3D"MsoNormal">
<span lang=3D"EN-US">Be unassigned=E2=80=9D<u></u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The 6man WG will need to make s=
uch a statement since it owns RFC 4291.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p align=3D"center" style=3D"margin:0cm 0cm 0.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7pt;color:black">Juniper Business U=
se Only</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p align=3D"center" style=3D"margin:0cm 0cm 0.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7pt;color:black">Juniper Business U=
se Only</span><span lang=3D"EN-US"><u></u><u></u></span></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>

_______________________________________________<br>
spring mailing list<br>
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>
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 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"ltr"><div><p class=3D"M=
soNormal"><span style=3D"font-family:Calibri,sans-serif;color:rgb(80,0,80);=
background-image:initial;background-position:initial;background-repeat:init=
ial">Gyan S. Mishra</span><span style=3D"color:rgb(80,0,80);background-imag=
e:initial;background-position:initial;background-repeat:initial"><span></sp=
an></span></p><p class=3D"MsoNormal"><span style=3D"font-family:Calibri,san=
s-serif;color:rgb(80,0,80);background-image:initial;background-position:ini=
tial;background-repeat:initial">IT Network Engineering &amp;
Technology=C2=A0</span><span style=3D"color:rgb(80,0,80);background-image:i=
nitial;background-position:initial;background-repeat:initial"><span></span>=
</span></p><p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-s=
erif;color:rgb(80,0,80);background-image:initial;background-position:initia=
l;background-repeat:initial">Verizon
Communications=C2=A0Inc. (VZ)</span><span style=3D"color:rgb(80,0,80);backg=
round-image:initial;background-position:initial;background-repeat:initial">=
<span></span></span></p><p class=3D"MsoNormal"><span style=3D"font-family:C=
alibri,sans-serif;color:rgb(80,0,80);background-image:initial;background-po=
sition:initial;background-repeat:initial">13101 Columbia Pike FDC1 3rd
Floor</span><span style=3D"color:rgb(80,0,80);background-image:initial;back=
ground-position:initial;background-repeat:initial"><span></span></span></p>=
<p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-serif;color:=
rgb(80,0,80);background-image:initial;background-position:initial;backgroun=
d-repeat:initial">Silver Spring, MD 20904</span><span style=3D"color:rgb(80=
,0,80);background-image:initial;background-position:initial;background-repe=
at:initial"><span></span></span></p><p class=3D"MsoNormal"><span style=3D"f=
ont-family:Calibri,sans-serif;color:rgb(80,0,80);background-image:initial;b=
ackground-position:initial;background-repeat:initial">United States</span><=
span style=3D"color:rgb(80,0,80);background-image:initial;background-positi=
on:initial;background-repeat:initial"><span></span></span></p><p class=3D"M=
soNormal" style=3D"background-image:initial;background-position:initial;bac=
kground-repeat:initial"><span style=3D"font-family:Calibri,sans-serif;color=
:rgb(80,0,80)">Phone:=C2=A0301 502-1347</span><span></span></p><p class=3D"=
MsoNormal" style=3D"background-image:initial;background-position:initial;ba=
ckground-repeat:initial"><span style=3D"font-family:Calibri,sans-serif;colo=
r:rgb(80,0,80)">Email:=C2=A0<a href=3D"mailto:gyan.s.mishra@verizon.com" ta=
rget=3D"_blank"><span style=3D"color:rgb(17,85,204)">gyan.s.mishra@verizon.=
com</span></a></span><span></span></p><p class=3D"MsoNormal" style=3D"margi=
n:0in 0in 0.0001pt;background-image:initial;background-position:initial;bac=
kground-repeat:initial;font-size:12pt;font-family:&quot;Times New Roman&quo=
t;,serif">















</p><p class=3D"MsoNormal" style=3D"background-image:initial;background-pos=
ition:initial;background-repeat:initial"><span><span style=3D"font-family:&=
quot;Segoe UI&quot;,sans-serif;color:black;border:1pt none windowtext;paddi=
ng:0in;background-image:initial;background-position:initial;background-repe=
at:initial"><a href=3D"http://www.linkedin.com/in/networking-technologies-c=
onsultant" target=3D"_blank">www.linkedin.com/in/networking-technologies-co=
nsultant</a></span></span><span><span style=3D"font-family:&quot;Segoe UI&q=
uot;,sans-serif;border:1pt none windowtext;padding:0in;background-image:ini=
tial;background-position:initial;background-repeat:initial"><span></span></=
span></span></p></div><div><br></div></div></div></div></div></div></div>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=
=3D"ltr"><div><p class=3D"MsoNormal"><span style=3D"font-family:Calibri,san=
s-serif;color:rgb(80,0,80);background-image:initial;background-position:ini=
tial;background-repeat:initial">Gyan S. Mishra</span><span style=3D"color:r=
gb(80,0,80);background-image:initial;background-position:initial;background=
-repeat:initial"><span></span></span></p><p class=3D"MsoNormal"><span style=
=3D"font-family:Calibri,sans-serif;color:rgb(80,0,80);background-image:init=
ial;background-position:initial;background-repeat:initial">IT Network Engin=
eering &amp;
Technology=C2=A0</span><span style=3D"color:rgb(80,0,80);background-image:i=
nitial;background-position:initial;background-repeat:initial"><span></span>=
</span></p><p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-s=
erif;color:rgb(80,0,80);background-image:initial;background-position:initia=
l;background-repeat:initial">Verizon
Communications=C2=A0Inc. (VZ)</span><span style=3D"color:rgb(80,0,80);backg=
round-image:initial;background-position:initial;background-repeat:initial">=
<span></span></span></p><p class=3D"MsoNormal"><span style=3D"font-family:C=
alibri,sans-serif;color:rgb(80,0,80);background-image:initial;background-po=
sition:initial;background-repeat:initial">13101 Columbia Pike FDC1 3rd
Floor</span><span style=3D"color:rgb(80,0,80);background-image:initial;back=
ground-position:initial;background-repeat:initial"><span></span></span></p>=
<p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-serif;color:=
rgb(80,0,80);background-image:initial;background-position:initial;backgroun=
d-repeat:initial">Silver Spring, MD 20904</span><span style=3D"color:rgb(80=
,0,80);background-image:initial;background-position:initial;background-repe=
at:initial"><span></span></span></p><p class=3D"MsoNormal"><span style=3D"f=
ont-family:Calibri,sans-serif;color:rgb(80,0,80);background-image:initial;b=
ackground-position:initial;background-repeat:initial">United States</span><=
span style=3D"color:rgb(80,0,80);background-image:initial;background-positi=
on:initial;background-repeat:initial"><span></span></span></p><p class=3D"M=
soNormal" style=3D"background-image:initial;background-position:initial;bac=
kground-repeat:initial"><span style=3D"font-family:Calibri,sans-serif;color=
:rgb(80,0,80)">Phone:=C2=A0301 502-1347</span><span></span></p><p class=3D"=
MsoNormal" style=3D"background-image:initial;background-position:initial;ba=
ckground-repeat:initial"><span style=3D"font-family:Calibri,sans-serif;colo=
r:rgb(80,0,80)">Email:=C2=A0<a href=3D"mailto:gyan.s.mishra@verizon.com" ta=
rget=3D"_blank"><span style=3D"color:rgb(17,85,204)">gyan.s.mishra@verizon.=
com</span></a></span><span></span></p><p class=3D"MsoNormal" style=3D"margi=
n:0in 0in 0.0001pt;background-image:initial;background-position:initial;bac=
kground-repeat:initial;font-size:12pt;font-family:&quot;Times New Roman&quo=
t;,serif">















</p><p class=3D"MsoNormal" style=3D"background-image:initial;background-pos=
ition:initial;background-repeat:initial"><span><span style=3D"font-family:&=
quot;Segoe UI&quot;,sans-serif;color:black;border:1pt none windowtext;paddi=
ng:0in;background-image:initial;background-position:initial;background-repe=
at:initial"><a href=3D"http://www.linkedin.com/in/networking-technologies-c=
onsultant" target=3D"_blank">www.linkedin.com/in/networking-technologies-co=
nsultant</a></span></span><span><span style=3D"font-family:&quot;Segoe UI&q=
uot;,sans-serif;border:1pt none windowtext;padding:0in;background-image:ini=
tial;background-position:initial;background-repeat:initial"><span></span></=
span></span></p></div><div><br></div></div></div></div></div></div></div>

--000000000000ee50e00594dfa89e--


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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 14 Oct 2019 16:34:18 +0200
Message-ID: <CAOj+MMFvA7sO1-1jSTRZQDNteH3UsaL0436b590hB54M6T1Unw@mail.gmail.com>
To: Gyan Mishra <hayabusagsm@gmail.com>
Cc: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>,  Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] IPv6 Addresses and SIDs
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Gyan,

 [Gyan]  Spring WG  -??  Because SRv6 uses the same IPv6 data plan as
>>> "Business as Usual" NORMAL IPv6 traffic use case of the "internet"  so
>>> the an "SRv6 enabled router" that has the code that supports SRv6 has the
>>> software feature to perform the PSP & USP but lets say the packet hits a
>>> node that does not support SRv6 then the PSP & USP won't occur and all the
>>> EH headers inserted for SRv6 routing header type 4 will remain in the
>>> packet to the end destination.   How do we deal with this issue.
>>>
>>

It's not an issue so we do not need to "deal with it".

SRv6 architecture operates just fine over non upgraded (read non SR aware)
IPv6 nodes.

r.

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<div dir=3D"ltr"><div>Gyan,</div><div class=3D"gmail_quote"><div dir=3D"ltr=
" class=3D"gmail_attr"><br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex"><div dir=3D"ltr"><div class=3D"gmail_quote"><blockquote class=3D"gm=
ail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,=
204,204);padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_quote"><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"ZH-CN"><div><div=
>
<p class=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt"><u></u>=C2=A0[Gyan]=C2=A0 Spring WG=C2=A0 -??=C2=
=A0 Because SRv6 uses the same IPv6 data plan as &quot;Business as Usual&qu=
ot; NORMAL IPv6 traffic use case of the &quot;internet&quot;=C2=A0</span><s=
pan style=3D"font-size:10.5pt">=C2=A0so the an &quot;SRv6 enabled router&qu=
ot; that has the code that supports SRv6 has the software feature to perfor=
m the PSP &amp; USP but lets say the packet hits a node that does not suppo=
rt SRv6 then the PSP &amp; USP won&#39;t occur and all the EH headers inser=
ted for SRv6 routing header type 4 will remain in the packet to the end des=
tination.=C2=A0 =C2=A0How do we deal with this issue.</span></p></div></div=
></div></blockquote></div></div></blockquote></div></div></blockquote><div>=
<br></div><div><br></div><div>It&#39;s not an issue so we do not need to &q=
uot;deal with it&quot;.=C2=A0</div><div><br></div><div>SRv6 architecture op=
erates just fine over non upgraded (read non SR aware) IPv6 nodes.=C2=A0</d=
iv><div><br></div><div>r.</div><div><br></div></div></div>

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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Mon, 14 Oct 2019 10:45:18 -0400
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To: Robert Raszuk <robert@raszuk.net>
Cc: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>,  "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
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Subject: Re: [spring] IPv6 Addresses and SIDs
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On Mon, Oct 14, 2019 at 10:34 AM Robert Raszuk <robert@raszuk.net> wrote:

> Gyan,
>
>  [Gyan]  Spring WG  -??  Because SRv6 uses the same IPv6 data plan as
>>>> "Business as Usual" NORMAL IPv6 traffic use case of the "internet"  so
>>>> the an "SRv6 enabled router" that has the code that supports SRv6 has =
the
>>>> software feature to perform the PSP & USP but lets say the packet hits=
 a
>>>> node that does not support SRv6 then the PSP & USP won't occur and all=
 the
>>>> EH headers inserted for SRv6 routing header type 4 will remain in the
>>>> packet to the end destination.   How do we deal with this issue.
>>>>
>>>
>
> It's not an issue so we do not need to "deal with it".
>
> SRv6 architecture operates just fine over non upgraded (read non SR aware=
)
> IPv6 nodes.
>
> r.
>

Ok did a google but could not find a draft on that please forward. So I can
see that is possible for intermediate nodes not necessary to be =E2=80=9CSR=
 aware=E2=80=9D
I get that but what about the PSP or USP node that removes the SRH EH
header.  I would think that functionality requires that node to be SRv6
aware.

I looked on LSR WG and there is an SRv6 extension for ISIS and OSPF as I
expected. So since there are extensions related to IGP goes back to my
original question of SRv6 aware nodes.


https://datatracker.ietf.org/doc/draft-ietf-ospf-ospfv3-segment-routing-ext=
ensions/
>

  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/



> --

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

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<div><br></div><div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, Oct 14, 2019 at 10:34 AM Robert Raszuk &lt;<a href=
=3D"mailto:robert@raszuk.net">robert@raszuk.net</a>&gt; wrote:<br></div><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #=
ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>Gyan,</div><div class=3D"=
gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr"><br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
 rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_qu=
ote"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bo=
rder-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><di=
v class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0=
px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><=
div lang=3D"ZH-CN"><div><div>
<p class=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt"><u></u>=C2=A0[Gyan]=C2=A0 Spring WG=C2=A0 -??=C2=
=A0 Because SRv6 uses the same IPv6 data plan as &quot;Business as Usual&qu=
ot; NORMAL IPv6 traffic use case of the &quot;internet&quot;=C2=A0</span><s=
pan style=3D"font-size:10.5pt">=C2=A0so the an &quot;SRv6 enabled router&qu=
ot; that has the code that supports SRv6 has the software feature to perfor=
m the PSP &amp; USP but lets say the packet hits a node that does not suppo=
rt SRv6 then the PSP &amp; USP won&#39;t occur and all the EH headers inser=
ted for SRv6 routing header type 4 will remain in the packet to the end des=
tination.=C2=A0 =C2=A0How do we deal with this issue.</span></p></div></div=
></div></blockquote></div></div></blockquote></div></div></blockquote><div>=
<br></div><div><br></div><div>It&#39;s not an issue so we do not need to &q=
uot;deal with it&quot;.=C2=A0</div><div><br></div><div>SRv6 architecture op=
erates just fine over non upgraded (read non SR aware) IPv6 nodes.=C2=A0</d=
iv></div></div><div dir=3D"ltr"><div class=3D"gmail_quote"><div><br></div><=
div>r.</div></div></div></blockquote><div dir=3D"auto"><br></div><div dir=
=3D"auto">Ok did a google but could not find a draft on that please forward=
. So I can see that is possible for intermediate nodes not necessary to be =
=E2=80=9CSR aware=E2=80=9D I get that but what about the PSP or USP node th=
at removes the SRH EH header.=C2=A0 I would think that functionality requir=
es that node to be SRv6 aware.</div><div dir=3D"auto"><br></div><div dir=3D=
"auto">I looked on LSR WG and there is an SRv6 extension for ISIS and OSPF =
as I expected. So since there are extensions related to IGP goes back to my=
 original question of SRv6 aware nodes.</div><div dir=3D"auto"><br></div><d=
iv dir=3D"auto"><br></div><blockquote class=3D"gmail_quote" style=3D"margin=
:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><=
div class=3D"gmail_quote"><div></div><div><div><a href=3D"https://datatrack=
er.ietf.org/doc/draft-ietf-ospf-ospfv3-segment-routing-extensions/">https:/=
/datatracker.ietf.org/doc/draft-ietf-ospf-ospfv3-segment-routing-extensions=
/</a></div></div></div></div></blockquote><div dir=3D"auto"><br></div><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #cc=
c solid;padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_quote"><div>=
<div></div></div></div></div></blockquote><div dir=3D"auto"><div>=C2=A0 <a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extension=
s/">https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/</=
a></div><br></div><div dir=3D"auto"><br></div><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex=
"><div dir=3D"ltr"><div class=3D"gmail_quote"><div><br></div></div></div>
</blockquote></div></div>-- <br><div dir=3D"ltr" class=3D"gmail_signature" =
data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><=
div dir=3D"ltr"><div><p class=3D"MsoNormal"><span style=3D"font-family:Cali=
bri,sans-serif;color:rgb(80,0,80);background-image:initial;background-posit=
ion:initial;background-repeat:initial">Gyan S. Mishra</span><span style=3D"=
color:rgb(80,0,80);background-image:initial;background-position:initial;bac=
kground-repeat:initial"><span></span></span></p><p class=3D"MsoNormal"><spa=
n style=3D"font-family:Calibri,sans-serif;color:rgb(80,0,80);background-ima=
ge:initial;background-position:initial;background-repeat:initial">IT Networ=
k Engineering &amp;
Technology=C2=A0</span><span style=3D"color:rgb(80,0,80);background-image:i=
nitial;background-position:initial;background-repeat:initial"><span></span>=
</span></p><p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-s=
erif;color:rgb(80,0,80);background-image:initial;background-position:initia=
l;background-repeat:initial">Verizon
Communications=C2=A0Inc. (VZ)</span><span style=3D"color:rgb(80,0,80);backg=
round-image:initial;background-position:initial;background-repeat:initial">=
<span></span></span></p><p class=3D"MsoNormal"><span style=3D"font-family:C=
alibri,sans-serif;color:rgb(80,0,80);background-image:initial;background-po=
sition:initial;background-repeat:initial">13101 Columbia Pike FDC1 3rd
Floor</span><span style=3D"color:rgb(80,0,80);background-image:initial;back=
ground-position:initial;background-repeat:initial"><span></span></span></p>=
<p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-serif;color:=
rgb(80,0,80);background-image:initial;background-position:initial;backgroun=
d-repeat:initial">Silver Spring, MD 20904</span><span style=3D"color:rgb(80=
,0,80);background-image:initial;background-position:initial;background-repe=
at:initial"><span></span></span></p><p class=3D"MsoNormal"><span style=3D"f=
ont-family:Calibri,sans-serif;color:rgb(80,0,80);background-image:initial;b=
ackground-position:initial;background-repeat:initial">United States</span><=
span style=3D"color:rgb(80,0,80);background-image:initial;background-positi=
on:initial;background-repeat:initial"><span></span></span></p><p class=3D"M=
soNormal" style=3D"background-image:initial;background-position:initial;bac=
kground-repeat:initial"><span style=3D"font-family:Calibri,sans-serif;color=
:rgb(80,0,80)">Phone:=C2=A0301 502-1347</span><span></span></p><p class=3D"=
MsoNormal" style=3D"background-image:initial;background-position:initial;ba=
ckground-repeat:initial"><span style=3D"font-family:Calibri,sans-serif;colo=
r:rgb(80,0,80)">Email:=C2=A0<a href=3D"mailto:gyan.s.mishra@verizon.com" ta=
rget=3D"_blank"><span style=3D"color:rgb(17,85,204)">gyan.s.mishra@verizon.=
com</span></a></span><span></span></p><p class=3D"MsoNormal" style=3D"margi=
n:0in 0in 0.0001pt;background-image:initial;background-position:initial;bac=
kground-repeat:initial;font-size:12pt;font-family:&quot;Times New Roman&quo=
t;,serif">















</p><p class=3D"MsoNormal" style=3D"background-image:initial;background-pos=
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quot;Segoe UI&quot;,sans-serif;color:black;border:1pt none windowtext;paddi=
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To: Robert Raszuk <robert@raszuk.net>
Cc: SPRING WG List <spring@ietf.org>
References: <SN6PR05MB5710CBAF8E6DF307401A2166AE9D0@SN6PR05MB5710.namprd05.prod.outlook.com> <04711680-e9c4-1159-58af-609517ee8bdf@joelhalpern.com> <CABNhwV3SyZNY6GrJF+wpgTmpM6DSts4gXQgdFTEgWfN876u5WQ@mail.gmail.com> <CABNhwV1Ym_AG7svmPUpmjGz600QyGRvtY5xNP0_K-hoGewUGTA@mail.gmail.com> <424b13a9a9bf4802b57c0609c92baad2@nokia-sbell.com> <BN7PR05MB569958ADB8E7BFF6C7EBC56AAE910@BN7PR05MB5699.namprd05.prod.outlook.com> <CAOj+MMHcTyCyO5Z3KyP5otW1Xgq7un2ypEGtjjWpr00j2t9dGw@mail.gmail.com> <BN7PR05MB5699B5C42BDBD5BF244CB4A8AE910@BN7PR05MB5699.namprd05.prod.outlook.com> <CAOj+MME70PYa7mkTRPKHqhg_1cMAvHLU0qZJx-=CjVy-ZKXpAA@mail.gmail.com> <BN7PR05MB56999C4E2F2D8E045D47E3C1AE900@BN7PR05MB5699.namprd05.prod.outlook.com> <5ae3ab05035f439db46fe5126b1476db@nokia-sbell.com> <CABNhwV1DFaGdCjyKOCXVdMjZQK1R=diq4GeZqrR-_BMFHjcdvQ@mail.gmail.com> <CABNhwV35zdBzLjLHa6rL7Zr4V3=24x4is72DbzL6V0EG-WgUSg@mail.gmail.com> <CAOj+MMFvA7sO1-1jSTRZQDNteH3UsaL0436b590hB54M6T1Unw@mail.gmail.com>
From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Date: Mon, 14 Oct 2019 11:18:34 -0400
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Subject: Re: [spring] IPv6 Addresses and SIDs
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The SRv6 base document (approved by the 6man working group) does include 
additional behavioral requirements for all nodes in an SRv6-enabled domain.

Yours,
Joel

On 10/14/2019 10:34 AM, Robert Raszuk wrote:
> Gyan,
> 
>             __Â [Gyan]Â  Spring WGÂ  -??Â  Because SRv6 uses the same IPv6
>             data plan as "Business as Usual" NORMAL IPv6 traffic use
>             case of the "internet" Â so the an "SRv6 enabled router" that
>             has the code that supports SRv6 has the software feature to
>             perform the PSP & USP but lets say the packet hits a node
>             that does not support SRv6 then the PSP & USP won't occur
>             and all the EH headers inserted for SRv6 routing header type
>             4 will remain in the packet to the end destination.Â  Â How do
>             we deal with this issue.
> 
> 
> 
> It's not an issue so we do not need to "deal with it".
> 
> SRv6 architecture operates just fine over non upgraded (read non SR 
> aware) IPv6 nodes.
> 
> r.
> 
> 
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
> 


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From: Rob Shakir <robjs@google.com>
Date: Mon, 14 Oct 2019 09:15:05 -0700
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--000000000000604a290594e12c53
Content-Type: text/plain; charset="UTF-8"

Folks,

Sorry for the delay here -- we've now received all the IPR answers on the
list and thus will adopt this document to the WG.

Authors -- please go ahead and re-submit this document as
draft-ietf-spring...

Thanks!
r.

On Sun, Aug 4, 2019 at 3:12 PM Rob Shakir <robjs@google.com> wrote:

> SPRING,
>
> Thanks for the review of this document. As with the other
> document, apologies for the delay in following up. Based on the mailing
> list replies, SPRING will adopt this document *once the IPR poll has been
> completed*.
>
> Authors - the following contributors have not yet responded to the IPR
> poll:
>
>    - D Steinberg
>    - G Dawra
>    - S Bryant
>    - H Assarpour
>    - H Shah
>    - L Contreras
>    - J Tantsura
>    - M Vigoureux
>
> We can't make a more pointed follow up as these contributors do not have
> their addresses listed in this draft, whilst not required -- they are
> appreciated for us to be able to follow up on those that have contributed
> material to drafts. Your assistance with following up here would be greatly
> appreciated.
>
> Thanks,
> r.
>
> On Wed, Jun 26, 2019 at 11:13 PM Rob Shakir <robjs@google.com> wrote:
>
>> Hi SPRING WG,
>>
>> This email initiates a two week working group adoption call for
>> draft-xuclad-spring-sr-service-programming. This follows the discussion
>> that we had in the last few IETF meetings, and particularly the focused
>> discussion we had at IETF 104 regarding service chaining and SPRING.
>>
>> Please indicate your support, comments, or objections for adopting this
>> draft by *Wednesday July 10th, 2019.* We are particularly interested in
>> hearing from WG members who are not authors of this draft, and those folks
>> that are willing to spend time working on this draft after adoption.
>>
>> We are also looking for volunteers who can provide a technical review of
>> the content of the draft at a later stage of its progress through the
>> working group (e.g., before WGLC).
>>
>> In parallel - we'll send an IPR poll to the working group and authors.
>> The currently disclosed IPR can be found in the datatracker
>> <https://datatracker.ietf.org/ipr/search/?submit=draft&id=draft-xuclad-spring-sr-service-programming>
>> .
>>
>> Thanks!
>> Rob & Bruno.
>>
>

--000000000000604a290594e12c53
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif">Folks,</div><div class=3D"gmail_default" style=3D"font-=
family:arial,helvetica,sans-serif"><br></div><div class=3D"gmail_default" s=
tyle=3D"font-family:arial,helvetica,sans-serif">Sorry for the delay here --=
 we&#39;ve now received all the IPR answers on the list and thus will adopt=
 this document to the WG.</div><div class=3D"gmail_default" style=3D"font-f=
amily:arial,helvetica,sans-serif"><br></div><div class=3D"gmail_default" st=
yle=3D"font-family:arial,helvetica,sans-serif">Authors -- please go ahead a=
nd re-submit this document as draft-ietf-spring...</div><div class=3D"gmail=
_default" style=3D"font-family:arial,helvetica,sans-serif"><br></div><div c=
lass=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif">Tha=
nks!</div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica=
,sans-serif">r.</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Sun, Aug 4, 2019 at 3:12 PM Rob Shakir &lt;<a href=
=3D"mailto:robjs@google.com">robjs@google.com</a>&gt; wrote:<br></div><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:=
1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div class=3D=
"gmail_default" style=3D"font-family:arial,helvetica,sans-serif">SPRING,<br=
></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sa=
ns-serif"><br></div><div class=3D"gmail_default" style=3D"font-family:arial=
,helvetica,sans-serif">Thanks for the review of this document. As with the =
other document,=C2=A0apologies for the delay in following up. Based on the =
mailing list replies, SPRING will adopt this document <b>once the IPR poll =
has been completed</b>.</div><div class=3D"gmail_default" style=3D"font-fam=
ily:arial,helvetica,sans-serif"><br></div><div class=3D"gmail_default" styl=
e=3D"font-family:arial,helvetica,sans-serif">Authors - the following contri=
butors have not yet responded=C2=A0to the IPR poll:</div><div class=3D"gmai=
l_default" style=3D"font-family:arial,helvetica,sans-serif"><ul><li>D Stein=
berg</li><li>G Dawra</li><li>S Bryant</li><li>H Assarpour</li><li>H Shah</l=
i><li>L Contreras</li><li>J Tantsura</li><li>M Vigoureux</li></ul><div>We c=
an&#39;t make=C2=A0a more pointed follow up as these contributors do not ha=
ve their=C2=A0addresses listed in this draft, whilst not required -- they a=
re appreciated for us to be able to follow up on those that have contribute=
d material to drafts. Your assistance with following up here would be=C2=A0=
greatly appreciated.</div><div><br></div><div>Thanks,</div><div>r.</div></d=
iv></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_att=
r">On Wed, Jun 26, 2019 at 11:13 PM Rob Shakir &lt;<a href=3D"mailto:robjs@=
google.com" target=3D"_blank">robjs@google.com</a>&gt; wrote:<br></div><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif"><div cl=
ass=3D"gmail_default">Hi SPRING WG,</div><div class=3D"gmail_default"><br><=
/div><div class=3D"gmail_default">This email initiates a two week working g=
roup adoption call for draft-xuclad-spring-sr-service-programming. This fol=
lows the discussion that we had in the last few IETF meetings, and particul=
arly the focused discussion we had at IETF 104 regarding service chaining a=
nd SPRING.</div><div class=3D"gmail_default"><br></div><div class=3D"gmail_=
default">Please indicate your support, comments, or objections for adopting=
 this draft by <b>Wednesday July 10th, 2019.</b>=C2=A0We are particularly i=
nterested in hearing from WG members who are not authors of this draft, and=
 those folks that are willing to spend time working on this draft after ado=
ption.</div><div class=3D"gmail_default"><br></div><div class=3D"gmail_defa=
ult">We are also looking for volunteers who can provide a technical review =
of the content of the draft at a later stage of its progress through the wo=
rking group (e.g., before WGLC).</div><div class=3D"gmail_default"><br></di=
v><div class=3D"gmail_default">In parallel - we&#39;ll send an IPR poll to =
the working group and authors. The currently disclosed IPR can be found in =
the=C2=A0<a href=3D"https://datatracker.ietf.org/ipr/search/?submit=3Ddraft=
&amp;id=3Ddraft-xuclad-spring-sr-service-programming" target=3D"_blank">dat=
atracker</a>.</div><div class=3D"gmail_default"><br></div><div class=3D"gma=
il_default">Thanks!</div><div class=3D"gmail_default">Rob &amp; Bruno.</div=
><div class=3D"gmail_default"></div></div></div>
</blockquote></div>
</blockquote></div>

--000000000000604a290594e12c53--


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From: Ron Bonica <rbonica@juniper.net>
To: Mark Smith <markzzzsmith@gmail.com>, "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
CC: Robert Raszuk <robert@raszuk.net>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] IPv6 Addresses and SIDs
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/5GWgB_X_5JSOpND-P_1TkwcuFbk>
Subject: Re: [spring] IPv6 Addresses and SIDs
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Content-Type: text/plain; charset="iso-2022-jp"
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Mark,

Clearly, this does not comply with the addressing architecture. But I think=
 that the best we can do is to limit the damage.

                                                                           =
Ron


From: Mark Smith <markzzzsmith@gmail.com>
Sent: Monday, October 14, 2019 4:08 AM
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>
Cc: Ron Bonica <rbonica@juniper.net>; Robert Raszuk <robert@raszuk.net>; SP=
RING WG List <spring@ietf.org>
Subject: Re: [spring] IPv6 Addresses and SIDs


On Mon, 14 Oct 2019, 16:45 Wang, Weibin (NSB - CN/Shanghai), <weibin.wang@n=
okia-sbell.com<mailto:weibin.wang@nokia-sbell.com>> wrote:
Hi Ron:

Make sense, If there is a dedicated IPv6 block for SRv6 SID within SRv6 dom=
ain, then trouble situation you described does NOT occur, because the IPv6 =
address covered within SRv6 SID prefix does not be involved ICMPv6 ND proto=
col, because they are not configured under IP interfaces connected to =1B$B=
!H=1B(BLink=1B$B!I=1B(B.

That does not comply with the IPv6 Addressing Architecture RFC.

(I think this is the 4th time SPRING have or are ignoring IPv6 specificatio=
ns.)

I also think that the authors of NET-PGM draft have indicated that SRv6 SID=
 has a separate IPv6 block in their Draft, but they don=1B$B!G=1B(Bt yet cl=
early stated which IPv6 block will be used for it.


--------------------------------------
Cheers !


WANG Weibin



Juniper Business Use Only
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Ron Bonica
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B14=1B$BF|=1B(B 9:23
To: Robert Raszuk <robert@raszuk.net<mailto:robert@raszuk.net>>
Cc: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] IPv6 Addresses and SIDs

Robert,

Yeah, there were a few typos in my original message. What I meant to say wa=
s:


  *   If a /64 contains a SID, it MUST NOT contain any addresses that repre=
sent interfaces.
  *   If a /64 contains an address that represents an interface, it MUST NO=
T contain SIDs.

If we don=1B$B!G=1B(Bt do this, we have to specify how nodes behave when th=
ey receive ICMPv6 NS messages in which the target is:


  *   A locally instantiated SID
  *   A SID learned from the IGP

                                                                      Ron


From: Robert Raszuk <robert@raszuk.net<mailto:robert@raszuk.net>>
Sent: Sunday, October 13, 2019 6:57 PM
To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Cc: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: IPv6 Addresses and SIDs

Hi Ron,

/64 prefix is a pile of addresses ... if someone would be to follow your su=
ggestion I could not allocate some blocks of that prefix on R1, then some o=
ther blocks on R2 then yet more on my servers.

You said:

=1B$B!H=1B(BWith a /64, if one /128 represents an IPv6 interface, as descri=
bed in RFC 4291, all /128 MUST either:


  *   Represent an IPv6 interface, as described in RFC 4291, or
  *   Be unassigned=1B$B!I=1B(B

Maybe you meant to say something else:

=1B$B!H=1B(BWhen a /64 is used as SRv6 locator prefix, if one /128 represen=
ts an IPv6 interface, as described in RFC 4291, all /128 MUST either:


  *   Represent an IPv6 interface, as described in RFC 4291, or
  *   Be unassigned=1B$B!I=1B(B
But then you sent this to SPRINT indicating that 6MAN should be the audienc=
e :).

Best,
R.


On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica <rbonica@juniper.net<mailto:rbo=
nica@juniper.net>> wrote:
Robert,

I=1B$B!G=1B(Bm having a hard time understanding exactly how I have violated=
 the longest match principle. Could you provide:


  *   A pointer to a statement of the longest match principle
  *   A few words regarding how I have violated it

                                                              Ron


From: Robert Raszuk <robert@raszuk.net<mailto:robert@raszuk.net>>
Sent: Sunday, October 13, 2019 5:24 PM
To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Cc: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: IPv6 Addresses and SIDs

Hi Ron,

I disagree.

Your suggestion violates longest prefix match principle in routing.

It is huge waist of address space and is not specific to IPv6 at all.

Let me describe the deployment case where your suggestion would cause it to=
 break:

I have /64 prefix where a few  /128s from that space I allocate to local in=
terfaces making it a local v6 destinations on those nodes.

However in the spirit of CIDR I still want to to use some blocks of that sp=
ace - say  /126 or /124 as blocks which I only use to trigger local NAT as =
per rfc6296. And NAT does not require local address to be a destination add=
ress so it would be a big disservice to kill such deployment option.

Many thx,
R.


On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D40juniper.net@dmarc.=
ietf.org<mailto:40juniper.net@dmarc.ietf.org>> wrote:
Folks,

I think that we need a global rule that says:

=1B$B!H=1B(BWith a /64, if one /128 represents an IPv6 interface, as descri=
bed in RFC 4291, all /128 MUST either:


  *   Represent an IPv6 interface, as described in RFC 4291, or
  *   Be unassigned=1B$B!I=1B(B

The 6man WG will need to make such a statement since it owns RFC 4291.

                                                             Ron


Juniper Business Use Only


Juniper Business Use Only
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</head>
<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Mark,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Clearly, this does not comply with the addressing ar=
chitecture. But I think that the best we can do is to limit the damage.<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><b>From:</b> Mark Smith &lt;markzzzsmith@gmail.com&g=
t; <br>
<b>Sent:</b> Monday, October 14, 2019 4:08 AM<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;weibin.wang@nokia-sbell.com=
&gt;<br>
<b>Cc:</b> Ron Bonica &lt;rbonica@juniper.net&gt;; Robert Raszuk &lt;robert=
@raszuk.net&gt;; SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] IPv6 Addresses and SIDs<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, 14 Oct 2019, 16:45 Wang, Weibin (NSB - CN/Sh=
anghai), &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com" target=3D"_blan=
k">weibin.wang@nokia-sbell.com</a>&gt; wrote:<o:p></o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.5pt;mso-fareast-language:ZH-CN">Hi Ron=
:</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.5pt;mso-fareast-language:ZH-CN">&nbsp;=
</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.5pt;mso-fareast-language:ZH-CN">Make s=
ense, If there is a dedicated IPv6 block for SRv6 SID within SRv6 domain, t=
hen trouble situation you described does
 NOT occur, because the IPv6 address covered within SRv6 SID prefix does no=
t be involved ICMPv6 ND protocol, because they are not configured under IP =
interfaces connected to
</span><span lang=3D"ZH-CN" style=3D"font-size:10.5pt;font-family:&quot;MS =
PGothic&quot;,sans-serif;mso-fareast-language:ZH-CN">=1B$B!H=1B(B</span><sp=
an style=3D"font-size:10.5pt;mso-fareast-language:ZH-CN">Link</span><span l=
ang=3D"ZH-CN" style=3D"font-size:10.5pt;font-family:&quot;MS PGothic&quot;,=
sans-serif;mso-fareast-language:ZH-CN">=1B$B!I=1B(B</span><span style=3D"fo=
nt-size:10.5pt;mso-fareast-language:ZH-CN">.&nbsp;</span><span style=3D"mso=
-fareast-language:ZH-CN"><o:p></o:p></span></p>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">That does not comply with the IPv6 Addressing Archit=
ecture RFC.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">(I think this is the 4th time SPRING have or are ign=
oring IPv6 specifications.)<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.5pt;mso-fareast-language:ZH-CN">I also=
 think that the authors of NET-PGM draft have indicated that SRv6 SID has a=
 separate IPv6 block in their Draft, but
 they don</span><span lang=3D"ZH-CN" style=3D"font-size:10.5pt;font-family:=
&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:ZH-CN">=1B$B!G=1B(B<=
/span><span style=3D"font-size:10.5pt;mso-fareast-language:ZH-CN">t yet cle=
arly stated which IPv6 block will be used for it.
</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.5pt;mso-fareast-language:ZH-CN">&nbsp;=
</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.5pt;mso-fareast-language:ZH-CN">&nbsp;=
</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;text-align:justify;text-justify:inter-ideograph">
<span style=3D"font-size:10.5pt;mso-fareast-language:ZH-CN">---------------=
-----------------------</span><span style=3D"mso-fareast-language:ZH-CN"><o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;text-align:justify;text-justify:inter-ideograph">
<i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,=
serif;mso-fareast-language:ZH-CN">Cheers !</span></i><span style=3D"mso-far=
east-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;text-align:justify;text-justify:inter-ideograph">
<span style=3D"font-size:10.5pt;mso-fareast-language:ZH-CN">&nbsp;</span><s=
pan style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;text-align:justify;text-justify:inter-ideograph">
<b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans-serif=
;mso-fareast-language:ZH-CN">&nbsp;</span></b><span style=3D"mso-fareast-la=
nguage:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;text-align:justify;text-justify:inter-ideograph">
<b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,=
serif;mso-fareast-language:ZH-CN">WANG Weibin&nbsp;
</span></b><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p=
>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.5pt;mso-fareast-language:ZH-CN">&nbsp;=
</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;font-family:&quot;Calibri&quot;,sans-serif;c=
olor:black">Juniper Business Use Only</span><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span style=3D"mso-fareast-language:ZH-CN">From:</span></b><spa=
n style=3D"mso-fareast-language:ZH-CN"> spring &lt;<a href=3D"mailto:spring=
-bounces@ietf.org" target=3D"_blank">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span lang=3D"ZH-CN" style=3D"font-family:&quot;MS =
Gothic&quot;;mso-fareast-language:ZH-CN">=1B$BG/=1B(B</span><span style=3D"=
mso-fareast-language:ZH-CN">10</span><span lang=3D"ZH-CN" style=3D"font-fam=
ily:&quot;MS Gothic&quot;;mso-fareast-language:ZH-CN">=1B$B7n=1B(B</span><s=
pan style=3D"mso-fareast-language:ZH-CN">14</span><span lang=3D"ZH-CN" styl=
e=3D"font-family:&quot;MS Gothic&quot;;mso-fareast-language:ZH-CN">=1B$BF|=
=1B(B</span><span style=3D"mso-fareast-language:ZH-CN">
 9:23<br>
<b>To:</b> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D=
"_blank">robert@raszuk.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] IPv6 Addresses and SIDs<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">Robert,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">Yeah, there were a few =
typos in my original message. What I meant to say was:<o:p></o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l4 level1 lfo1">
<span style=3D"mso-fareast-language:ZH-CN">If a /64 contains a SID, it MUST=
 NOT contain any addresses that represent interfaces.<o:p></o:p></span></li=
><li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom=
-alt:auto;mso-list:l4 level1 lfo1">
<span style=3D"mso-fareast-language:ZH-CN">If a /64 contains an address tha=
t represents an interface, it MUST NOT contain SIDs.<o:p></o:p></span></li>=
</ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">If we don</span><span l=
ang=3D"ZH-CN" style=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso-fa=
reast-language:ZH-CN">=1B$B!G=1B(B</span><span style=3D"mso-fareast-languag=
e:ZH-CN">t
 do this, we have to specify how nodes behave when they receive ICMPv6 NS m=
essages in which the target is:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l0 level1 lfo2">
<span style=3D"mso-fareast-language:ZH-CN">A locally instantiated SID<o:p><=
/o:p></span></li><li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;m=
so-margin-bottom-alt:auto;mso-list:l0 level1 lfo2">
<span style=3D"mso-fareast-language:ZH-CN">A SID learned from the IGP<o:p><=
/o:p></span></li></ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span style=3D"mso-fareast-language:ZH-CN">From:</span></b><spa=
n style=3D"mso-fareast-language:ZH-CN"> Robert Raszuk &lt;<a href=3D"mailto=
:robert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 6:57 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: IPv6 Addresses and SIDs<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">Hi Ron,<o:p></o:p></spa=
n></p>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">/64 prefix is a pile of=
 addresses ... if someone would be to follow your suggestion I could not al=
locate some blocks of that prefix on R1,
 then some other blocks on R2 then yet more on my servers.&nbsp;<o:p></o:p>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">You said:&nbsp;<o:p></o=
:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;MS PGothic&quot=
;,sans-serif;mso-fareast-language:ZH-CN">=1B$B!H=1B(B</span></b><b><span st=
yle=3D"mso-fareast-language:ZH-CN">With a /64, if one /128 represents
 an IPv6 interface, as described in RFC 4291, all /128 MUST either:</span><=
/b><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span style=3D"mso-fareast-language:ZH-CN">&nbsp;</span></b><sp=
an style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l5 level1 lfo3">
<b><span style=3D"mso-fareast-language:ZH-CN">Represent an IPv6 interface, =
as described in RFC 4291, or</span></b><span style=3D"mso-fareast-language:=
ZH-CN"><o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"mso-margin-t=
op-alt:auto;mso-margin-bottom-alt:auto;mso-list:l5 level1 lfo3">
<b><span style=3D"mso-fareast-language:ZH-CN">Be unassigned</span></b><b><s=
pan lang=3D"ZH-CN" style=3D"font-family:&quot;MS PGothic&quot;,sans-serif;m=
so-fareast-language:ZH-CN">=1B$B!I=1B(B</span></b><span style=3D"mso-fareas=
t-language:ZH-CN"><o:p></o:p></span></li></ul>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">Maybe you meant to say =
something else:&nbsp;<o:p></o:p></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;MS PGothic&quot=
;,sans-serif;color:red;mso-fareast-language:ZH-CN">=1B$B!H=1B(B</span></b><=
b><span style=3D"color:red;mso-fareast-language:ZH-CN">When a /64
 is used as SRv6 locator prefix,</span></b><b><span style=3D"color:black;ms=
o-fareast-language:ZH-CN"> if one /128 represents an IPv6 interface, as des=
cribed in RFC 4291, all /128 MUST either:</span></b><span style=3D"mso-fare=
ast-language:ZH-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span style=3D"color:black;mso-fareast-language:ZH-CN">&nbsp;</=
span></b><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l2 level1 lfo4">
<b><span style=3D"color:black;mso-fareast-language:ZH-CN">Represent an IPv6=
 interface, as described in RFC 4291, or</span></b><span style=3D"mso-farea=
st-language:ZH-CN"><o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"=
mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo4"=
>
<b><span style=3D"color:black;mso-fareast-language:ZH-CN">Be unassigned</sp=
an></b><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;MS PGothic&quot;,=
sans-serif;color:black;mso-fareast-language:ZH-CN">=1B$B!I=1B(B</span></b><=
span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></li></ul>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">But then you sent this =
to SPRINT indicating that 6MAN should be the audience :).&nbsp;<o:p></o:p><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">Best,<br>
R.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">On Mon, Oct 14, 2019 at=
 12:45 AM Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_=
blank">rbonica@juniper.net</a>&gt; wrote:<o:p></o:p></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">Robert,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">I</span><span lang=3D"Z=
H-CN" style=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-la=
nguage:ZH-CN">=1B$B!G=1B(B</span><span style=3D"mso-fareast-language:ZH-CN"=
>m
 having a hard time understanding exactly how I have violated the longest m=
atch principle. Could you provide:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l1 level1 lfo5">
<span style=3D"mso-fareast-language:ZH-CN">A pointer to a statement of the =
longest match principle<o:p></o:p></span></li><li class=3D"MsoNormal" style=
=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 l=
fo5">
<span style=3D"mso-fareast-language:ZH-CN">A few words regarding how I have=
 violated it<o:p></o:p></span></li></ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span style=3D"mso-fareast-language:ZH-CN">From:</span></b><spa=
n style=3D"mso-fareast-language:ZH-CN"> Robert Raszuk &lt;<a href=3D"mailto=
:robert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 5:24 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> IPv6 Addresses and SIDs<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">Hi Ron,<o:p></o:p></spa=
n></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">I disagree.&nbsp;<o:p><=
/o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">Your suggestion violate=
s&nbsp;longest prefix match principle in routing.&nbsp;<o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">It is huge waist of add=
ress space and is not specific to IPv6 at all.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">Let me describe the dep=
loyment case where your suggestion&nbsp;would cause it to break:&nbsp;<o:p>=
</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">I have /64 prefix where=
 a few&nbsp; /128s from that space I allocate to local interfaces making it=
 a local v6 destinations on those nodes.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">However in the spirit o=
f CIDR I still want to to use some blocks of that space - say&nbsp; /126 or=
 /124 as blocks which I only use to trigger
 local NAT as per&nbsp;rfc6296. And NAT does not require local address to b=
e a destination address so it would be a big disservice to kill such deploy=
ment option.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">Many thx,<br>
R.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">On Sun, Oct 13, 2019 at=
 10:59 PM Ron Bonica &lt;rbonica=3D<a href=3D"mailto:40juniper.net@dmarc.ie=
tf.org" target=3D"_blank">40juniper.net@dmarc.ietf.org</a>&gt;
 wrote:<o:p></o:p></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">Folks,<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">I think that we need a =
global rule that says:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span lang=3D"ZH-CN" style=3D"font-family:&quot;MS PGothic&quot;,s=
ans-serif;mso-fareast-language:ZH-CN">=1B$B!H=1B(B</span><span style=3D"mso=
-fareast-language:ZH-CN">With a /64, if one /128 represents an
 IPv6 interface, as described in RFC 4291, all /128 MUST either:<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l3 level1 lfo6">
<span style=3D"mso-fareast-language:ZH-CN">Represent an IPv6 interface, as =
described in RFC 4291, or<o:p></o:p></span></li><li class=3D"MsoNormal" sty=
le=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1=
 lfo6">
<span style=3D"mso-fareast-language:ZH-CN">Be unassigned</span><span lang=
=3D"ZH-CN" style=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso-farea=
st-language:ZH-CN">=1B$B!I=1B(B</span><span style=3D"mso-fareast-language:Z=
H-CN"><o:p></o:p></span></li></ul>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">The 6man WG will need t=
o make such a statement since it owns RFC 4291.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p align=3D"center" style=3D"margin:0in;margin-bottom:.0001pt;text-align:ce=
nter"><span style=3D"font-size:7.0pt;color:black;mso-fareast-language:ZH-CN=
">Juniper Business Use Only</span><span style=3D"mso-fareast-language:ZH-CN=
"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:p></o:p></span=
></p>
<p align=3D"center" style=3D"margin:0in;margin-bottom:.0001pt;text-align:ce=
nter"><span style=3D"font-size:7.0pt;color:black;mso-fareast-language:ZH-CN=
">Juniper Business Use Only</span><span style=3D"mso-fareast-language:ZH-CN=
"><o:p></o:p></span></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
<p class=3D"MsoNormal">_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo=
/spring__;!8WoA6RjC81c!SEkBOAmRsYlBjRKWx1gZ4eegKkzZOKQgTtZuXxMv5TgCiZMT9xl0=
OH0Q8pbdZee9$" target=3D"_blank">https://www.ietf.org/mailman/listinfo/spri=
ng</a><o:p></o:p></p>
</blockquote>
</div>
</div>
</div>
</div>
</body>
</html>

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From nobody Mon Oct 14 11:12:48 2019
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From: "Susan Hares" <shares@ndzh.com>
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Date: Mon, 14 Oct 2019 14:12:34 -0400
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Subject: Re: [spring] [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Greetings IDR and Spring WG

 

The WG Adoption for the two IDR drafts related to IDR received a level
support below the threshold to accept this draft into the IDR WG.  There
were no objection, but there was simply a low level of response. 

 

This 1 week extension to the Adoption call is to let the members of both the
IDR and SPRING WG comment on whether these drafts have matured enough to be
IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination of
whether either of these two drafts have enough support to be accepted. 

 

Thank you,  Susan  Hares

IDR co-chair 

 

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

 

This begins a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019]


.         draft-li-bgp-ls-sr-policy-path-segment-03.txt and 

.         draft-li-idr-sr-policy-path-segment-01.txt. 

 

You can access these two drafts at the following location: 

 

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/

 

https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/

 

The authors have pointed out that the adoption of this 

draft since the following  SR-MPLS Path Segment draft has been adopted: 

 

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00

 

Please consider the following questions in your responses? 

 

1)      Should this SR Policy technology be included in BGP for SR-MPLS 

 

Spring has adopted the draft, but IDR can provide feedback 

to spring about putting this technology in BGP.

 

2)      Is this technology a good way to implement the required 

Features in BGP? 

 

3)      Is this technology ready for adoption? 

 

4)      Do you have any concerns about adopting this technology? 

 

 

Cheers, Susan Hares 


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--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Greetings IDR and Spring =
WG<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>The WG Adoption for the =
two IDR drafts related to IDR received a level support below the =
threshold to accept this draft into the IDR WG.&nbsp; There were no =
objection, but there was simply a low level of response. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>This 1 week extension to =
the Adoption call is to let the members of both the IDR and SPRING WG =
comment on whether these drafts have matured enough to be IDR WG drafts. =
&nbsp;On 10/21/2019, the IDR chairs will make a determination of whether =
either of these two drafts have enough support to be accepted. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Thank you,&nbsp; =
Susan&nbsp; Hares<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>IDR co-chair <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
Idr [mailto:idr-bounces@ietf.org] <b>On Behalf Of </b>Susan =
Hares<br><b>Sent:</b> Tuesday, September 17, 2019 12:35 PM<br><b>To:</b> =
'idr wg'<br><b>Subject:</b> [Idr] Adoption: =
draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and =
draft-li-sr-policy-path-segment-01.txt [9/17 to =
10/1/2019]<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>This begins =
a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019] =
<o:p></o:p></p><p class=3DMsoListParagraph =
style=3D'margin-left:38.25pt;text-indent:-.25in;mso-list:l1 level1 =
lfo2'><![if !supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span =
dir=3DLTR></span>draft-li-bgp-ls-sr-policy-path-segment-03.txt and =
<o:p></o:p></p><p class=3DMsoListParagraph =
style=3D'margin-left:38.25pt;text-indent:-.25in;mso-list:l1 level1 =
lfo2'><![if !supportLists]><span style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span =
dir=3DLTR></span>draft-li-idr-sr-policy-path-segment-01.txt. =
<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>You can access these two drafts at the following =
location: <o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><a =
href=3D"https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-pa=
th-segment/">https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-poli=
cy-path-segment/</a><o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><a =
href=3D"https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segm=
ent/">https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segmen=
t/</a><o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>The authors have pointed out that the adoption of this =
<o:p></o:p></p><p class=3DMsoNormal>draft since the following =
&nbsp;SR-MPLS Path Segment draft has been adopted: <o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><a =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-0=
0">https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00</a>=
<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Please consider the following questions in your =
responses? <o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 level1 =
lfo4'><![if !supportLists]><span style=3D'mso-list:Ignore'>1)<span =
style=3D'font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span><![endif]><span dir=3DLTR></span>Should this SR Policy =
technology be included in BGP for SR-MPLS <o:p></o:p></p><p =
class=3DMsoListParagraph><o:p>&nbsp;</o:p></p><p =
class=3DMsoListParagraph>Spring has adopted the draft, but IDR can =
provide feedback <o:p></o:p></p><p class=3DMsoListParagraph>to spring =
about putting this technology in BGP.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoListParagraph =
style=3D'text-indent:-.25in;mso-list:l0 level1 lfo4'><![if =
!supportLists]><span style=3D'mso-list:Ignore'>2)<span =
style=3D'font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span><![endif]><span dir=3DLTR></span>Is this technology a good =
way to implement the required <o:p></o:p></p><p =
class=3DMsoListParagraph>Features in BGP? <o:p></o:p></p><p =
class=3DMsoListParagraph><o:p>&nbsp;</o:p></p><p =
class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 level1 =
lfo4'><![if !supportLists]><span style=3D'mso-list:Ignore'>3)<span =
style=3D'font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span><![endif]><span dir=3DLTR></span>Is this technology ready =
for adoption? <o:p></o:p></p><p =
class=3DMsoListParagraph><o:p>&nbsp;</o:p></p><p =
class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 level1 =
lfo4'><![if !supportLists]><span style=3D'mso-list:Ignore'>4)<span =
style=3D'font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span><![endif]><span dir=3DLTR></span>Do you have any concerns =
about adopting this technology? <o:p></o:p></p><p =
class=3DMsoListParagraph><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Cheers, =
Susan Hares <o:p></o:p></p></div></body></html>
------=_NextPart_000_00FA_01D58299.6D630230--


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From: Ron Bonica <rbonica@juniper.net>
To: SPRING WG List <spring@ietf.org>
Thread-Topic: draft-ietf-spring-srv6-network-programming-04: Section1
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Subject: [spring] draft-ietf-spring-srv6-network-programming-04: Section1
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Authors,

In Section 1, you say:

"The network programming consists in combining segment routing functions, b=
oth simple and complex, to achieve a networking  objective that goes beyond=
 mere packet routing."

In your opinion, do any of the functions defined in this document go beyond=
 mere packet routing? If so, which?

If not, can you give an example of a function that does go beyond mere pack=
et routing?

                                                                           =
      Ron




Juniper Business Use Only

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<p class=3D"MsoNormal">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In Section 1, you say:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&#8220;The network programming consists in combining=
 segment routing functions, both simple and complex, to achieve a networkin=
g&nbsp; objective that goes beyond mere packet routing.&#8221;<o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In your opinion, do any of the functions defined in =
this document go beyond mere packet routing? If so, which?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">If not, can you give an example of a function that d=
oes go beyond mere packet routing?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
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sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From: Ron Bonica <rbonica@juniper.net>
To: SPRING WG List <spring@ietf.org>
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Authors,

In Section 2 of draft-ietf-spring-srv6-network-programming-04, you say:

"SRH: Segment Routing Header as defined in  [I-D.ietf-6man-segment-routing-=
header].  We assume that the SRH may be present multiple times inside each =
packet."

Did you mean to remove the final sentence?

                                     Ron



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<p class=3D"MsoNormal">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In Section 2 of draft-ietf-spring-srv6-network-progr=
amming-04, you say:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&#8220;SRH: Segment Routing Header as defined in&nbs=
p; [I-D.ietf-6man-segment-routing-header].&nbsp; We assume that the SRH may=
 be present multiple times inside each packet.&#8221;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did you mean to remove the final sentence?<o:p></o:p=
></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From: Ron Bonica <rbonica@juniper.net>
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Authors,

The USP flavor of the END, END.X and END.T functions isn't needed.

USP is the default IPv6 behavior. So, if the source node specifies SID[0] a=
s an RFC 4291 address on the SR egress node, you get the USP behavior for f=
ree.

                                                           Ron



Juniper Business Use Only

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<p class=3D"MsoNormal">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The USP flavor of the END, END.X and END.T functions=
 isn&#8217;t needed.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">USP is the default IPv6 behavior. So, if the source =
node specifies SID[0] as an RFC 4291 address on the SR egress node, you get=
 the USP behavior for free.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron=
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>  can you give an example of a function that does go beyond mere packet
routing?

An instruction(s) which triggers explicit detection of probe packet and
adjusts the switching vector to special hardware to handle it

Examples: https://tools.ietf.org/html/draft-lapukhov-dataplane-probe-01

Thx,
R.

On Mon, Oct 14, 2019 at 8:26 PM Ron Bonica <rbonica=3D
40juniper.net@dmarc.ietf.org> wrote:

> Authors,
>
>
>
> In Section 1, you say:
>
>
>
> =E2=80=9CThe network programming consists in combining segment routing fu=
nctions,
> both simple and complex, to achieve a networking  objective that goes
> beyond mere packet routing.=E2=80=9D
>
>
>
> In your opinion, do any of the functions defined in this document go
> beyond mere packet routing? If so, which?
>
>
>
> If not, can you give an example of a function that does go beyond mere
> packet routing?
>
>
>
>
>                                                                   Ron
>
>
>
>
>
> Juniper Business Use Only
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>

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<div dir=3D"ltr"><div><br></div>&gt;=C2=A0 can you give an example of a fun=
ction that does go beyond mere packet routing?=C2=A0=C2=A0<br><div><br></di=
v><div>An instruction(s) which triggers explicit detection of probe packet =
and adjusts the switching vector to special hardware to handle it=C2=A0</di=
v><div><br></div><div>Examples:=C2=A0<a href=3D"https://tools.ietf.org/html=
/draft-lapukhov-dataplane-probe-01">https://tools.ietf.org/html/draft-lapuk=
hov-dataplane-probe-01</a>=C2=A0</div><div><br></div><div>Thx,<br>R.</div><=
/div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">O=
n Mon, Oct 14, 2019 at 8:26 PM Ron Bonica &lt;rbonica=3D<a href=3D"mailto:4=
0juniper.net@dmarc.ietf.org">40juniper.net@dmarc.ietf.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">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal">Authors,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">In Section 1, you say:<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=E2=80=9CThe network programming consists in combini=
ng segment routing functions, both simple and complex, to achieve a network=
ing=C2=A0 objective that goes beyond mere packet routing.=E2=80=9D<u></u><u=
></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">In your opinion, do any of the functions defined in =
this document go beyond mere packet routing? If so, which?<u></u><u></u></p=
>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">If not, can you give an example of a function that d=
oes go beyond mere packet routing?<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u><=
/p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<br>
<p align=3D"Center" style=3D"margin:0px"><span style=3D"font-size:7pt;font-=
family:Calibri;color:rgb(0,0,0)">Juniper Business Use Only</span></p>
</div>
</div>

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>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
</blockquote></div>

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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 14 Oct 2019 20:41:56 +0200
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Hi Ron,

Packet may have many headers. Each header may contain an SRH. So if you
look at entire packet there can be multiple SRH instances there.

:)

Thx,
R.


On Mon, Oct 14, 2019 at 8:27 PM Ron Bonica <rbonica=3D
40juniper.net@dmarc.ietf.org> wrote:

> Authors,
>
>
>
> In Section 2 of draft-ietf-spring-srv6-network-programming-04, you say:
>
>
>
> =E2=80=9CSRH: Segment Routing Header as defined in
> [I-D.ietf-6man-segment-routing-header].  We assume that the SRH may be
> present multiple times inside each packet.=E2=80=9D
>
>
>
> Did you mean to remove the final sentence?
>
>
>
>                                      Ron
>
>
>
> Juniper Business Use Only
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>

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<div dir=3D"ltr">Hi Ron,<div><br></div><div>Packet may have many headers. E=
ach header may contain an SRH. So if you look at entire packet there can be=
 multiple SRH instances there.=C2=A0</div><div><br></div><div>:)</div><div>=
<br></div><div>Thx,</div><div>R.</div><div><br></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Oct 14, 2019=
 at 8:27 PM Ron Bonica &lt;rbonica=3D<a href=3D"mailto:40juniper.net@dmarc.=
ietf.org">40juniper.net@dmarc.ietf.org</a>&gt; wrote:<br></div><blockquote =
class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px sol=
id rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal">Authors,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">In Section 2 of draft-ietf-spring-srv6-network-progr=
amming-04, you say:<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=E2=80=9CSRH: Segment Routing Header as defined in=
=C2=A0 [I-D.ietf-6man-segment-routing-header].=C2=A0 We assume that the SRH=
 may be present multiple times inside each packet.=E2=80=9D<u></u><u></u></=
p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Did you mean to remove the final sentence?<u></u><u>=
</u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 Ron<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<br>
<p align=3D"Center" style=3D"margin:0px"><span style=3D"font-size:7pt;font-=
family:Calibri;color:rgb(0,0,0)">Juniper Business Use Only</span></p>
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From: Ron Bonica <rbonica@juniper.net>
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Thread-Topic: draft-ietf-spring-srv6-network-programming: Section 4.16
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Subject: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Authors,

Lacking the B.INSERT and T.INSERT functions, can you describe a use-case fo=
r the PSP and USP flavors of the END, END.X and END.T functions?

                                              Ron



Juniper Business Use Only

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<p class=3D"MsoNormal">Lacking the B.INSERT and T.INSERT functions, can you=
 describe a use-case for the PSP and USP flavors of the END, END.X and END.=
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From: Ron Bonica <rbonica@juniper.net>
To: Robert Raszuk <robert@raszuk.net>
CC: SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming-04: Section 2
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Section 2
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Robert,

In that is what you mean, you might want to do one of the following:


  *   Remove the sentence entirely
  *   Remove the ambiguity. One could interpret the sentence as an artifact=
 of older draft versions in which it was OK for two SRH's to follow a singl=
e IPv6 header.

                                                 Ron


From: Robert Raszuk <robert@raszuk.net>
Sent: Monday, October 14, 2019 2:42 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Sectio=
n 2

Hi Ron,

Packet may have many headers. Each header may contain an SRH. So if you loo=
k at entire packet there can be multiple SRH instances there.

:)

Thx,
R.


On Mon, Oct 14, 2019 at 8:27 PM Ron Bonica <rbonica=3D40juniper.net@dmarc.i=
etf.org<mailto:40juniper.net@dmarc.ietf.org>> wrote:
Authors,

In Section 2 of draft-ietf-spring-srv6-network-programming-04, you say:

"SRH: Segment Routing Header as defined in  [I-D.ietf-6man-segment-routing-=
header].  We assume that the SRH may be present multiple times inside each =
packet."

Did you mean to remove the final sentence?

                                     Ron



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<p class=3D"MsoNormal">Robert,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In that is what you mean, you might want to do one o=
f the following:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo3">Remove the sentence entirely<o:p></o:p></li><li class=3D"MsoListParag=
raph" style=3D"margin-left:0in;mso-list:l0 level1 lfo3">Remove the ambiguit=
y. One could interpret the sentence as an artifact of older draft versions =
in which it was OK for two SRH&#8217;s to follow a single IPv6 header.<o:p>=
</o:p></li></ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><b>From:</b> Robert Raszuk &lt;robert@raszuk.net&gt;=
 <br>
<b>Sent:</b> Monday, October 14, 2019 2:42 PM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Cc:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming-04:=
 Section 2<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">Hi Ron,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Packet may have many headers. Each header may contai=
n an SRH. So if you look at entire packet there can be multiple SRH instanc=
es there.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">:)<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Thx,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">R.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, Oct 14, 2019 at 8:27 PM Ron Bonica &lt;rboni=
ca=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org">40juniper.net@dmarc.ie=
tf.org</a>&gt; wrote:<o:p></o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">In Section 2 of draft-ietf-spring-srv6-network-programming-04, you=
 say:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&#8220;SRH: Segment Routing Header as defined in&nbsp; [I-D.ietf-6=
man-segment-routing-header].&nbsp; We assume that the SRH may be present mu=
ltiple times inside each packet.&#8221;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Did you mean to remove the final sentence?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Ron<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p align=3D"center" style=3D"margin:0in;margin-bottom:.0001pt;text-align:ce=
nter"><span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only=
</span><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">_______________________________________________<br>
spring mailing list<br>
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CPdNI9Paq3ya$" target=3D"_blank">https://www.ietf.org/mailman/listinfo/spri=
ng</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
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From: Ron Bonica <rbonica@juniper.net>
To: Robert Raszuk <robert@raszuk.net>
CC: SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming-04: Section1
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Section1
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Content-Type: text/plain; charset="us-ascii"
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Robert,

Reading the draft, I would hope that these "non-routing" functions had some=
thing to do with the IP layer (OAM, etc). It would be helpful if you could =
provide a few examples and maybe even references to other drafts.

That would allay fears that we were about to see an amazing layer violation=
.

                                                                     Ron




From: Robert Raszuk <robert@raszuk.net>
Sent: Monday, October 14, 2019 2:41 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Sectio=
n1


>  can you give an example of a function that does go beyond mere packet ro=
uting?

An instruction(s) which triggers explicit detection of probe packet and adj=
usts the switching vector to special hardware to handle it

Examples: https://tools.ietf.org/html/draft-lapukhov-dataplane-probe-01<htt=
ps://urldefense.com/v3/__https:/tools.ietf.org/html/draft-lapukhov-dataplan=
e-probe-01__;!8WoA6RjC81c!RLBo_hyspstgm4WbFYdQCEjsDVz8qI2w71Phu9zXfJxB596vQ=
m_KQvM1wAcnNnvk$>

Thx,
R.

On Mon, Oct 14, 2019 at 8:26 PM Ron Bonica <rbonica=3D40juniper.net@dmarc.i=
etf.org<mailto:40juniper.net@dmarc.ietf.org>> wrote:
Authors,

In Section 1, you say:

"The network programming consists in combining segment routing functions, b=
oth simple and complex, to achieve a networking  objective that goes beyond=
 mere packet routing."

In your opinion, do any of the functions defined in this document go beyond=
 mere packet routing? If so, which?

If not, can you give an example of a function that does go beyond mere pack=
et routing?

                                                                           =
      Ron




Juniper Business Use Only
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<p class=3D"MsoNormal">Robert,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Reading the draft, I would hope that these &#8220;no=
n-routing&#8221; functions had something to do with the IP layer (OAM, etc)=
. It would be helpful if you could provide a few examples and maybe even re=
ferences to other drafts.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">That would allay fears that we were about to see an =
amazing layer violation.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><b>From:</b> Robert Raszuk &lt;robert@raszuk.net&gt;=
 <br>
<b>Sent:</b> Monday, October 14, 2019 2:41 PM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Cc:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming-04:=
 Section1<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal">&gt;&nbsp; can you give an example of a function tha=
t does go beyond mere packet routing?&nbsp;&nbsp;<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">An instruction(s) which triggers explicit detection =
of probe packet and adjusts the switching vector to special hardware to han=
dle it&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Examples:&nbsp;<a href=3D"https://urldefense.com/v3/=
__https:/tools.ietf.org/html/draft-lapukhov-dataplane-probe-01__;!8WoA6RjC8=
1c!RLBo_hyspstgm4WbFYdQCEjsDVz8qI2w71Phu9zXfJxB596vQm_KQvM1wAcnNnvk$">https=
://tools.ietf.org/html/draft-lapukhov-dataplane-probe-01</a>&nbsp;<o:p></o:=
p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Thx,<br>
R.<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, Oct 14, 2019 at 8:26 PM Ron Bonica &lt;rboni=
ca=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org">40juniper.net@dmarc.ie=
tf.org</a>&gt; wrote:<o:p></o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">In Section 1, you say:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&#8220;The network programming consists in combining segment routi=
ng functions, both simple and complex, to achieve a networking&nbsp; object=
ive that goes beyond mere packet routing.&#8221;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">In your opinion, do any of the functions defined in this document =
go beyond mere packet routing? If so, which?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">If not, can you give an example of a function that does go beyond =
mere packet routing?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p align=3D"center" style=3D"margin:0in;margin-bottom:.0001pt;text-align:ce=
nter"><span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only=
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</div>
</div>
<p class=3D"MsoNormal">_______________________________________________<br>
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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 14 Oct 2019 21:06:58 +0200
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> That would allay fears that we were about to see an amazing layer
violation.

Well P4 is here and folks are getting smarter with their hardware
capabilities. My impression is that layer violation is already here - well
at least all tools to get there are shipping :)



On Mon, Oct 14, 2019 at 8:54 PM Ron Bonica <rbonica@juniper.net> wrote:

> Robert,
>
>
>
> Reading the draft, I would hope that these =E2=80=9Cnon-routing=E2=80=9D =
functions had
> something to do with the IP layer (OAM, etc). It would be helpful if you
> could provide a few examples and maybe even references to other drafts.
>
>
>
> That would allay fears that we were about to see an amazing layer
> violation.
>
>
>
>                                                                      Ron
>
>
>
>
>
>
>
>
>
> *From:* Robert Raszuk <robert@raszuk.net>
> *Sent:* Monday, October 14, 2019 2:41 PM
> *To:* Ron Bonica <rbonica@juniper.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* Re: [spring] draft-ietf-spring-srv6-network-programming-04:
> Section1
>
>
>
>
>
> >  can you give an example of a function that does go beyond mere packet
> routing?
>
>
>
> An instruction(s) which triggers explicit detection of probe packet and
> adjusts the switching vector to special hardware to handle it
>
>
>
> Examples: https://tools.ietf.org/html/draft-lapukhov-dataplane-probe-01
> <https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-lapukhov-da=
taplane-probe-01__;!8WoA6RjC81c!RLBo_hyspstgm4WbFYdQCEjsDVz8qI2w71Phu9zXfJx=
B596vQm_KQvM1wAcnNnvk$>
>
>
>
>
> Thx,
> R.
>
>
>
> On Mon, Oct 14, 2019 at 8:26 PM Ron Bonica <rbonica=3D
> 40juniper.net@dmarc.ietf.org> wrote:
>
> Authors,
>
>
>
> In Section 1, you say:
>
>
>
> =E2=80=9CThe network programming consists in combining segment routing fu=
nctions,
> both simple and complex, to achieve a networking  objective that goes
> beyond mere packet routing.=E2=80=9D
>
>
>
> In your opinion, do any of the functions defined in this document go
> beyond mere packet routing? If so, which?
>
>
>
> If not, can you give an example of a function that does go beyond mere
> packet routing?
>
>
>
>
>                                                                   Ron
>
>
>
>
>
>
>
> Juniper Business Use Only
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
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_;!8WoA6RjC81c!RLBo_hyspstgm4WbFYdQCEjsDVz8qI2w71Phu9zXfJxB596vQm_KQvM1wKl8=
maI0$>
>
>
>
> Juniper Business Use Only
>
>

--000000000000feb4400594e39212
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<div dir=3D"ltr"><div><br></div>&gt; That would allay fears that we were ab=
out to see an amazing layer violation.=C2=A0=C2=A0<br><div><br></div><div>W=
ell P4 is here and folks are getting smarter with their hardware capabiliti=
es. My impression is that layer violation is already here - well at least a=
ll tools to get there are shipping :)=C2=A0</div><div><br></div><div><br></=
div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_at=
tr">On Mon, Oct 14, 2019 at 8:54 PM Ron Bonica &lt;<a href=3D"mailto:rbonic=
a@juniper.net">rbonica@juniper.net</a>&gt; wrote:<br></div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid r=
gb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_306029194923500892WordSection1">
<p class=3D"MsoNormal">Robert,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Reading the draft, I would hope that these =E2=80=9C=
non-routing=E2=80=9D functions had something to do with the IP layer (OAM, =
etc). It would be helpful if you could provide a few examples and maybe eve=
n references to other drafts.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">That would allay fears that we were about to see an =
amazing layer violation.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></=
u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><b>From:</b> Robert Raszuk &lt;<a href=3D"mailto:rob=
ert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; <br>
<b>Sent:</b> Monday, October 14, 2019 2:41 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming-04:=
 Section1<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal">&gt;=C2=A0 can you give an example of a function tha=
t does go beyond mere packet routing?=C2=A0=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">An instruction(s) which triggers explicit detection =
of probe packet and adjusts the switching vector to special hardware to han=
dle it=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Examples:=C2=A0<a href=3D"https://urldefense.com/v3/=
__https:/tools.ietf.org/html/draft-lapukhov-dataplane-probe-01__;!8WoA6RjC8=
1c!RLBo_hyspstgm4WbFYdQCEjsDVz8qI2w71Phu9zXfJxB596vQm_KQvM1wAcnNnvk$" targe=
t=3D"_blank">https://tools.ietf.org/html/draft-lapukhov-dataplane-probe-01<=
/a>=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Thx,<br>
R.<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, Oct 14, 2019 at 8:26 PM Ron Bonica &lt;rboni=
ca=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40ju=
niper.net@dmarc.ietf.org</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin:5pt 0i=
n 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal">Authors,<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">In Section 1, you say:<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">=E2=80=9CThe network programming consists in combini=
ng segment routing functions, both simple and complex, to achieve a network=
ing=C2=A0 objective that goes beyond mere packet routing.=E2=80=9D<u></u><u=
></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">In your opinion, do any of the functions defined in =
this document go beyond mere packet routing? If so, which?<u></u><u></u></p=
>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">If not, can you give an example of a function that d=
oes go beyond mere packet routing?<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u><=
/p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p align=3D"center" style=3D"margin:0in 0in 0.0001pt;text-align:center"><sp=
an style=3D"font-size:7pt;color:black">Juniper Business Use Only</span><u><=
/u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal">_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo=
/spring__;!8WoA6RjC81c!RLBo_hyspstgm4WbFYdQCEjsDVz8qI2w71Phu9zXfJxB596vQm_K=
QvM1wKl8maI0$" target=3D"_blank">https://www.ietf.org/mailman/listinfo/spri=
ng</a><u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"gmail-m_306029194923500892msipfooter30b3d538" align=3D"center" =
style=3D"margin:0in 0in 0.0001pt;text-align:center">
<span style=3D"font-size:7pt;color:black">Juniper Business Use Only</span><=
u></u><u></u></p>
</blockquote>
</div>
</div>
</div>

</blockquote></div>

--000000000000feb4400594e39212--


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From: Mark Smith <markzzzsmith@gmail.com>
Date: Tue, 15 Oct 2019 07:31:12 +1100
Message-ID: <CAO42Z2wU9X-FaR1OZ_FKXMSfGNVw5bb0uJF1j1+7xkkwR9pxbA@mail.gmail.com>
To: Ron Bonica <rbonica@juniper.net>
Cc: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, Robert Raszuk <robert@raszuk.net>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] IPv6 Addresses and SIDs
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On Tue, 15 Oct 2019, 04:19 Ron Bonica, <rbonica@juniper.net> wrote:

> Mark,
>
>
>
> Clearly, this does not comply with the addressing architecture. But I
> think that the best we can do is to limit the damage.
>

Has SPRING tried?

Assigning this address space to a virtual interface in the device would
make it comply with the RFC 4291 architecture, and also provide a handle
within the device for any other functions that could be operationally
useful.

For example, the SNMP MIB traffic counters for that virtual interface could
show SR traffic volumes as distinct from other IPv6 traffic to, from or
through the device. If there a different SR address spaces on the device,
the could be attached to different virtual interfaces, providing more
discrete SR traffic counters.

Having a virtual SR interface would also provide a handle to attach a
packet filter ACL to, which may be useful.

Having used IP encryption implementations that both did and didn't
represent traffic encryption paths as virtual tunnel interfaces, the tunnel
virtual interfaces implementations (also eventually adopted by the
non-virtual interface implementations) far more obvious and intuitive to
work with.

Regards,
Mark.



>
>
> Ron
>
>
>
>
>
> *From:* Mark Smith <markzzzsmith@gmail.com>
> *Sent:* Monday, October 14, 2019 4:08 AM
> *To:* Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>
> *Cc:* Ron Bonica <rbonica@juniper.net>; Robert Raszuk <robert@raszuk.net>=
;
> SPRING WG List <spring@ietf.org>
> *Subject:* Re: [spring] IPv6 Addresses and SIDs
>
>
>
>
>
> On Mon, 14 Oct 2019, 16:45 Wang, Weibin (NSB - CN/Shanghai), <
> weibin.wang@nokia-sbell.com> wrote:
>
> Hi Ron:
>
>
>
> Make sense, If there is a dedicated IPv6 block for SRv6 SID within SRv6
> domain, then trouble situation you described does NOT occur, because the
> IPv6 address covered within SRv6 SID prefix does not be involved ICMPv6 N=
D
> protocol, because they are not configured under IP interfaces connected t=
o
> =E2=80=9CLink=E2=80=9D.
>
>
>
> That does not comply with the IPv6 Addressing Architecture RFC.
>
>
>
> (I think this is the 4th time SPRING have or are ignoring IPv6
> specifications.)
>
>
>
> I also think that the authors of NET-PGM draft have indicated that SRv6
> SID has a separate IPv6 block in their Draft, but they don=E2=80=99t yet =
clearly
> stated which IPv6 block will be used for it.
>
>
>
>
>
> --------------------------------------
>
> *Cheers !*
>
>
>
>
>
> *WANG Weibin  *
>
>
>
>
>
> Juniper Business Use Only
>
> *From:* spring <spring-bounces@ietf.org> *On Behalf Of *Ron Bonica
> *Sent:* 2019=E5=B9=B410=E6=9C=8814=E6=97=A5 9:23
> *To:* Robert Raszuk <robert@raszuk.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* Re: [spring] IPv6 Addresses and SIDs
>
>
>
> Robert,
>
>
>
> Yeah, there were a few typos in my original message. What I meant to say
> was:
>
>
>
>    - If a /64 contains a SID, it MUST NOT contain any addresses that
>    represent interfaces.
>    - If a /64 contains an address that represents an interface, it MUST
>    NOT contain SIDs.
>
>
>
> If we don=E2=80=99t do this, we have to specify how nodes behave when the=
y
> receive ICMPv6 NS messages in which the target is:
>
>
>
>    - A locally instantiated SID
>    - A SID learned from the IGP
>
>
>
>                                                                       Ron
>
>
>
>
>
> *From:* Robert Raszuk <robert@raszuk.net>
> *Sent:* Sunday, October 13, 2019 6:57 PM
> *To:* Ron Bonica <rbonica@juniper.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* Re: IPv6 Addresses and SIDs
>
>
>
> Hi Ron,
>
>
>
> /64 prefix is a pile of addresses ... if someone would be to follow your
> suggestion I could not allocate some blocks of that prefix on R1, then so=
me
> other blocks on R2 then yet more on my servers.
>
>
>
> You said:
>
>
>
> *=E2=80=9C**With a /64, if one /128 represents an IPv6 interface, as desc=
ribed in
> RFC 4291, all /128 MUST either:*
>
>
>
>    - *Represent an IPv6 interface, as described in RFC 4291, or*
>    - *Be unassigned**=E2=80=9D*
>
>
>
> Maybe you meant to say something else:
>
>
>
> *=E2=80=9C**When a /64 is used as SRv6 locator prefix,** if one /128 repr=
esents
> an IPv6 interface, as described in RFC 4291, all /128 MUST either:*
>
>
>
>    - *Represent an IPv6 interface, as described in RFC 4291, or*
>    - *Be unassigned**=E2=80=9D*
>
> But then you sent this to SPRINT indicating that 6MAN should be the
> audience :).
>
>
>
> Best,
> R.
>
>
>
>
>
> On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica <rbonica@juniper.net> wrote:
>
> Robert,
>
>
>
> I=E2=80=99m having a hard time understanding exactly how I have violated =
the
> longest match principle. Could you provide:
>
>
>
>    - A pointer to a statement of the longest match principle
>    - A few words regarding how I have violated it
>
>
>
>                                                               Ron
>
>
>
>
>
> *From:* Robert Raszuk <robert@raszuk.net>
> *Sent:* Sunday, October 13, 2019 5:24 PM
> *To:* Ron Bonica <rbonica@juniper.net>
> *Cc:* SPRING WG List <spring@ietf.org>
> *Subject:* IPv6 Addresses and SIDs
>
>
>
> Hi Ron,
>
>
>
> I disagree.
>
>
>
> Your suggestion violates longest prefix match principle in routing.
>
>
>
> It is huge waist of address space and is not specific to IPv6 at all.
>
>
>
> Let me describe the deployment case where your suggestion would cause it
> to break:
>
>
>
> I have /64 prefix where a few  /128s from that space I allocate to local
> interfaces making it a local v6 destinations on those nodes.
>
>
>
> However in the spirit of CIDR I still want to to use some blocks of that
> space - say  /126 or /124 as blocks which I only use to trigger local NAT
> as per rfc6296. And NAT does not require local address to be a destinatio=
n
> address so it would be a big disservice to kill such deployment option.
>
>
>
> Many thx,
> R.
>
>
>
>
>
> On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D
> 40juniper.net@dmarc.ietf.org> wrote:
>
> Folks,
>
>
>
> I think that we need a global rule that says:
>
>
>
> =E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as describ=
ed in
> RFC 4291, all /128 MUST either:
>
>
>
>    - Represent an IPv6 interface, as described in RFC 4291, or
>    - Be unassigned=E2=80=9D
>
>
>
> The 6man WG will need to make such a statement since it owns RFC 4291.
>
>
>
>                                                              Ron
>
>
>
> Juniper Business Use Only
>
>
>
> Juniper Business Use Only
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
> <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/spring_=
_;!8WoA6RjC81c!SEkBOAmRsYlBjRKWx1gZ4eegKkzZOKQgTtZuXxMv5TgCiZMT9xl0OH0Q8pbd=
Zee9$>
>
>

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

<div dir=3D"auto"><div><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Tue, 15 Oct 2019, 04:19 Ron Bonica, &lt;<a href=3D"=
mailto:rbonica@juniper.net">rbonica@juniper.net</a>&gt; wrote:<br></div><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #=
ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-6039026296836876400WordSection1">
<p class=3D"MsoNormal">Mark,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Clearly, this does not comply with the addressing ar=
chitecture. But I think that the best we can do is to limit the damage.</p>=
</div></div></blockquote></div></div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Has SPRING tried?</div><div dir=3D"auto"><br></div><div dir=3D"au=
to">Assigning this address space to a virtual interface in the device would=
 make it comply with the RFC 4291 architecture, and also provide a handle w=
ithin the device for any other functions that could be operationally useful=
.</div><div dir=3D"auto"><br></div><div dir=3D"auto">For example, the SNMP =
MIB traffic counters for that virtual interface could show SR traffic volum=
es as distinct from other IPv6 traffic to, from or through the device. If t=
here a different SR address spaces on the device, the could be attached to =
different virtual interfaces, providing more discrete SR traffic counters.<=
/div><div dir=3D"auto"><br></div><div dir=3D"auto">Having a virtual SR inte=
rface would also provide a handle to attach a packet filter ACL to, which m=
ay be useful.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Having use=
d IP encryption implementations that both did and didn&#39;t represent traf=
fic encryption paths as virtual tunnel interfaces, the tunnel virtual inter=
faces implementations (also eventually adopted by the non-virtual interface=
 implementations) far more obvious and intuitive to work with.</div><div di=
r=3D"auto"><br></div><div dir=3D"auto">Regards,</div><div dir=3D"auto">Mark=
.</div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></div><div dir=3D"=
auto"><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D=
"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang=
=3D"EN-US" link=3D"blue" vlink=3D"purple"><div class=3D"m_-6039026296836876=
400WordSection1"><p class=3D"MsoNormal"><u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Ron<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><b>From:</b> Mark Smith &lt;<a href=3D"mailto:markzz=
zsmith@gmail.com" target=3D"_blank" rel=3D"noreferrer">markzzzsmith@gmail.c=
om</a>&gt; <br>
<b>Sent:</b> Monday, October 14, 2019 4:08 AM<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com" target=3D"_blank" rel=3D"noreferrer">weibin.wang@nokia-=
sbell.com</a>&gt;<br>
<b>Cc:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank" rel=3D"noreferrer">rbonica@juniper.net</a>&gt;; Robert Raszuk &lt;<=
a href=3D"mailto:robert@raszuk.net" target=3D"_blank" rel=3D"noreferrer">ro=
bert@raszuk.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.o=
rg" target=3D"_blank" rel=3D"noreferrer">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] IPv6 Addresses and SIDs<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><u></u>=C2=A0<u></u><=
/p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, 14 Oct 2019, 16:45 Wang, Weibin (NSB - CN/Sh=
anghai), &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com" target=3D"_blan=
k" rel=3D"noreferrer">weibin.wang@nokia-sbell.com</a>&gt; wrote:<u></u><u><=
/u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Hi Ron:</span><span=
><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">=C2=A0</span><span>=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Make sense, If ther=
e is a dedicated IPv6 block for SRv6 SID within SRv6 domain, then trouble s=
ituation you described does
 NOT occur, because the IPv6 address covered within SRv6 SID prefix does no=
t be involved ICMPv6 ND protocol, because they are not configured under IP =
interfaces connected to
</span><span lang=3D"ZH-CN" style=3D"font-size:10.5pt;font-family:&quot;MS =
PGothic&quot;,sans-serif">=E2=80=9C</span><span style=3D"font-size:10.5pt">=
Link</span><span lang=3D"ZH-CN" style=3D"font-size:10.5pt;font-family:&quot=
;MS PGothic&quot;,sans-serif">=E2=80=9D</span><span style=3D"font-size:10.5=
pt">.=C2=A0</span><span><u></u><u></u></span></p>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">That does not comply with the IPv6 Addressing Archit=
ecture RFC.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">(I think this is the 4th time SPRING have or are ign=
oring IPv6 specifications.)<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">I also think that t=
he authors of NET-PGM draft have indicated that SRv6 SID has a separate IPv=
6 block in their Draft, but
 they don</span><span lang=3D"ZH-CN" style=3D"font-size:10.5pt;font-family:=
&quot;MS PGothic&quot;,sans-serif">=E2=80=99</span><span style=3D"font-size=
:10.5pt">t yet clearly stated which IPv6 block will be used for it.
</span><span><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">=C2=A0</span><span>=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">=C2=A0</span><span>=
<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph">
<span style=3D"font-size:10.5pt">--------------------------------------</sp=
an><span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph">
<i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,=
serif">Cheers !</span></i><span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph">
<span style=3D"font-size:10.5pt">=C2=A0</span><span><u></u><u></u></span></=
p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph">
<b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans-serif=
">=C2=A0</span></b><span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph">
<b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,=
serif">WANG Weibin=C2=A0
</span></b><span><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">=C2=A0</span><span>=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"m_-6039026296836876400msipfooter30b3d538" align=3D"center" styl=
e=3D"margin:0in;margin-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;font-family:&quot;Calibri&quot;,sans-serif;c=
olor:black">Juniper Business Use Only</span><u></u><u></u></p>
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span>From:</span></b><span> spring &lt;<a href=
=3D"mailto:spring-bounces@ietf.org" target=3D"_blank" rel=3D"noreferrer">sp=
ring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span lang=3D"ZH-CN" style=3D"font-family:&quot;MS =
Gothic&quot;">=E5=B9=B4</span><span>10</span><span lang=3D"ZH-CN" style=3D"=
font-family:&quot;MS Gothic&quot;">=E6=9C=88</span><span>14</span><span lan=
g=3D"ZH-CN" style=3D"font-family:&quot;MS Gothic&quot;">=E6=97=A5</span><sp=
an>
 9:23<br>
<b>To:</b> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D=
"_blank" rel=3D"noreferrer">robert@raszuk.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank" rel=3D"noreferrer">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] IPv6 Addresses and SIDs<u></u><u></u></span></=
p>
</div>
</div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>Robert,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>Yeah, there were a few typos in my original me=
ssage. What I meant to say was:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span>If a /64 contains a SID, it MUST NOT contain any addresses that repre=
sent interfaces.<u></u><u></u></span></li><li class=3D"MsoNormal">
<span>If a /64 contains an address that represents an interface, it MUST NO=
T contain SIDs.<u></u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>If we don</span><span lang=3D"ZH-CN" style=3D"=
font-family:&quot;MS PGothic&quot;,sans-serif">=E2=80=99</span><span>t
 do this, we have to specify how nodes behave when they receive ICMPv6 NS m=
essages in which the target is:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span>A locally instantiated SID<u></u><u></u></span></li><li class=3D"MsoN=
ormal">
<span>A SID learned from the IGP<u></u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 =C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span>From:</span></b><span> Robert Raszuk &lt;<a=
 href=3D"mailto:robert@raszuk.net" target=3D"_blank" rel=3D"noreferrer">rob=
ert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 6:57 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank" rel=3D"noreferrer">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank" rel=3D"noreferrer">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: IPv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span>Hi Ron,<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>/64 prefix is a pile of addresses ... if someo=
ne would be to follow your suggestion I could not allocate some blocks of t=
hat prefix on R1,
 then some other blocks on R2 then yet more on my servers.=C2=A0<u></u><u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>You said:=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;M=
S PGothic&quot;,sans-serif">=E2=80=9C</span></b><b><span>With a /64, if one=
 /128 represents
 an IPv6 interface, as described in RFC 4291, all /128 MUST either:</span><=
/b><span><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span>=C2=A0</span></b><span><u></u><u></u></span=
></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<b><span>Represent an IPv6 interface, as described in RFC 4291, or</span></=
b><span><u></u><u></u></span></li><li class=3D"MsoNormal">
<b><span>Be unassigned</span></b><b><span lang=3D"ZH-CN" style=3D"font-fami=
ly:&quot;MS PGothic&quot;,sans-serif">=E2=80=9D</span></b><span><u></u><u><=
/u></span></li></ul>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Maybe you meant to say something else:=C2=A0<u=
></u><u></u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;M=
S PGothic&quot;,sans-serif;color:red">=E2=80=9C</span></b><b><span style=3D=
"color:red">When a /64
 is used as SRv6 locator prefix,</span></b><b><span style=3D"color:black"> =
if one /128 represents an IPv6 interface, as described in RFC 4291, all /12=
8 MUST either:</span></b><span><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"color:black">=C2=A0</span></b><spa=
n><u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<b><span style=3D"color:black">Represent an IPv6 interface, as described in=
 RFC 4291, or</span></b><span><u></u><u></u></span></li><li class=3D"MsoNor=
mal">
<b><span style=3D"color:black">Be unassigned</span></b><b><span lang=3D"ZH-=
CN" style=3D"font-family:&quot;MS PGothic&quot;,sans-serif;color:black">=E2=
=80=9D</span></b><span><u></u><u></u></span></li></ul>
</div>
<div>
<p class=3D"MsoNormal"><span>But then you sent this to SPRINT indicating th=
at 6MAN should be the audience :).=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Best,<br>
R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica &l=
t;<a href=3D"mailto:rbonica@juniper.net" target=3D"_blank" rel=3D"noreferre=
r">rbonica@juniper.net</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span>Robert,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>I</span><span lang=3D"ZH-CN" style=3D"font-fam=
ily:&quot;MS PGothic&quot;,sans-serif">=E2=80=99</span><span>m
 having a hard time understanding exactly how I have violated the longest m=
atch principle. Could you provide:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span>A pointer to a statement of the longest match principle<u></u><u></u>=
</span></li><li class=3D"MsoNormal">
<span>A few words regarding how I have violated it<u></u><u></u></span></li=
></ul>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span>From:</span></b><span> Robert Raszuk &lt;<a=
 href=3D"mailto:robert@raszuk.net" target=3D"_blank" rel=3D"noreferrer">rob=
ert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 5:24 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank" rel=3D"noreferrer">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank" rel=3D"noreferrer">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> IPv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>Hi Ron,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>I disagree.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Your suggestion violates=C2=A0longest prefix m=
atch principle in routing.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>It is huge waist of address space and is not s=
pecific to IPv6 at all.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Let me describe the deployment case where your=
 suggestion=C2=A0would cause it to break:=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>I have /64 prefix where a few=C2=A0 /128s from=
 that space I allocate to local interfaces making it a local v6 destination=
s on those nodes.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>However in the spirit of CIDR I still want to =
to use some blocks of that space - say=C2=A0 /126 or /124 as blocks which I=
 only use to trigger
 local NAT as per=C2=A0rfc6296. And NAT does not require local address to b=
e a destination address so it would be a big disservice to kill such deploy=
ment option.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Many thx,<br>
R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica &l=
t;rbonica=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blan=
k" rel=3D"noreferrer">40juniper.net@dmarc.ietf.org</a>&gt;
 wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span>Folks,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>I think that we need a global rule that says:<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"ZH-CN" style=3D"font-family:&quot;MS P=
Gothic&quot;,sans-serif">=E2=80=9C</span><span>With a /64, if one /128 repr=
esents an
 IPv6 interface, as described in RFC 4291, all /128 MUST either:<u></u><u><=
/u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span>Represent an IPv6 interface, as described in RFC 4291, or<u></u><u></=
u></span></li><li class=3D"MsoNormal">
<span>Be unassigned</span><span lang=3D"ZH-CN" style=3D"font-family:&quot;M=
S PGothic&quot;,sans-serif">=E2=80=9D</span><span><u></u><u></u></span></li=
></ul>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>The 6man WG will need to make such a statement=
 since it owns RFC 4291.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p align=3D"center" style=3D"margin:0in;margin-bottom:.0001pt;text-align:ce=
nter"><span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only=
</span><span><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p align=3D"center" style=3D"margin:0in;margin-bottom:.0001pt;text-align:ce=
nter"><span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only=
</span><span><u></u><u></u></span></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
<p class=3D"MsoNormal">_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank" rel=3D"noreferrer">spr=
ing@ietf.org</a><br>
<a href=3D"https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo=
/spring__;!8WoA6RjC81c!SEkBOAmRsYlBjRKWx1gZ4eegKkzZOKQgTtZuXxMv5TgCiZMT9xl0=
OH0Q8pbdZee9$" target=3D"_blank" rel=3D"noreferrer">https://www.ietf.org/ma=
ilman/listinfo/spring</a><u></u><u></u></p>
</blockquote>
</div>
</div>
</div>
</div>
</div>

</blockquote></div></div></div>

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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Mon, 14 Oct 2019 16:46:57 -0400
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To: Mark Smith <markzzzsmith@gmail.com>
Cc: Robert Raszuk <robert@raszuk.net>, Ron Bonica <rbonica@juniper.net>,  SPRING WG List <spring@ietf.org>,  "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
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Subject: Re: [spring] IPv6 Addresses and SIDs
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On Mon, Oct 14, 2019 at 4:31 PM Mark Smith <markzzzsmith@gmail.com> wrote:

>
>
> On Tue, 15 Oct 2019, 04:19 Ron Bonica, <rbonica@juniper.net> wrote:
>
>> Mark,
>>
>>
>>
>> Clearly, this does not comply with the addressing architecture. But I
>> think that the best we can do is to limit the damage.
>>
>
> Has SPRING tried?
>
> Assigning this address space to a virtual interface in the device would
> make it comply with the RFC 4291 architecture, and also provide a handle
> within the device for any other functions that could be operationally
> useful..
>
> For example, the SNMP MIB traffic counters for that virtual interface
> could show SR traffic volumes as distinct from other IPv6 traffic to, fro=
m
> or through the device. If there a different SR address spaces on the
> device, the could be attached to different virtual interfaces, providing
> more discrete SR traffic counters.
>
> Having a virtual SR interface would also provide a handle to attach a
> packet filter ACL to, which may be useful.
>
> Having used IP encryption implementations that both did and didn't
> represent traffic encryption paths as virtual tunnel interfaces, the tunn=
el
> virtual interfaces implementations (also eventually adopted by the
> non-virtual interface implementations) far more obvious and intuitive to
> work with.
>
> Regards,
> Mark..
>
> [Gyan]. Since we are requiring IPv6 encapsulation anyway on the ingress
> origin source node adding the  SRH EH in flight we could make it a GRE
> tunnel interface which would add 4 extra GRE bytes but would provide an
> interface for traffic statistics and mib counters depicting the IPv6 data
> plane identical to a 6in6 tunnel.
>


 Other even simpler option is to use a loopback with the dedicated SID /64
> prefix defines so its decoupled from any physical interface.
>

Since the traffic for SRv6 reuses the same IPv6 data plane the traffic
would go normally over the IGP routed enabled path to the next hop SID in
the SID list so the only gain from using GRE tunnel is if you want to be
able to decouple the SRv6 traffic from other IPv6 traffic since both share
the same data plane.

>
>>
>>
>> Ron
>>
>>
>>
>>
>>
>> *From:* Mark Smith <markzzzsmith@gmail.com>
>> *Sent:* Monday, October 14, 2019 4:08 AM
>> *To:* Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>
>> *Cc:* Ron Bonica <rbonica@juniper.net>; Robert Raszuk <robert@raszuk.net=
>;
>> SPRING WG List <spring@ietf.org>
>> *Subject:* Re: [spring] IPv6 Addresses and SIDs
>>
>>
>>
>>
>>
>> On Mon, 14 Oct 2019, 16:45 Wang, Weibin (NSB - CN/Shanghai), <
>> weibin.wang@nokia-sbell.com> wrote:
>>
>> Hi Ron:
>>
>>
>>
>> Make sense, If there is a dedicated IPv6 block for SRv6 SID within SRv6
>> domain, then trouble situation you described does NOT occur, because the
>> IPv6 address covered within SRv6 SID prefix does not be involved ICMPv6 =
ND
>> protocol, because they are not configured under IP interfaces connected =
to
>> =E2=80=9CLink=E2=80=9D.
>>
>>
>>
>> That does not comply with the IPv6 Addressing Architecture RFC.
>>
>>
>>
>> (I think this is the 4th time SPRING have or are ignoring IPv6
>> specifications.)
>>
>>
>>
>> I also think that the authors of NET-PGM draft have indicated that SRv6
>> SID has a separate IPv6 block in their Draft, but they don=E2=80=99t yet=
 clearly
>> stated which IPv6 block will be used for it.
>>
>>
>>
>>
>>
>> --------------------------------------
>>
>> *Cheers !*
>>
>>
>>
>>
>>
>> *WANG Weibin  *
>>
>>
>>
>>
>>
>> Juniper Business Use Only
>>
>> *From:* spring <spring-bounces@ietf.org> *On Behalf Of *Ron Bonica
>> *Sent:* 2019=E5=B9=B410=E6=9C=8814=E6=97=A5 9:23
>> *To:* Robert Raszuk <robert@raszuk.net>
>> *Cc:* SPRING WG List <spring@ietf.org>
>> *Subject:* Re: [spring] IPv6 Addresses and SIDs
>>
>>
>>
>> Robert,
>>
>>
>>
>> Yeah, there were a few typos in my original message. What I meant to say
>> was:
>>
>>
>>
>>    - If a /64 contains a SID, it MUST NOT contain any addresses that
>>    represent interfaces.
>>    - If a /64 contains an address that represents an interface, it MUST
>>    NOT contain SIDs.
>>
>>
>>
>> If we don=E2=80=99t do this, we have to specify how nodes behave when th=
ey
>> receive ICMPv6 NS messages in which the target is:
>>
>>
>>
>>    - A locally instantiated SID
>>    - A SID learned from the IGP
>>
>>
>>
>>                                                                       Ro=
n
>>
>>
>>
>>
>>
>> *From:* Robert Raszuk <robert@raszuk.net>
>> *Sent:* Sunday, October 13, 2019 6:57 PM
>> *To:* Ron Bonica <rbonica@juniper.net>
>> *Cc:* SPRING WG List <spring@ietf.org>
>> *Subject:* Re: IPv6 Addresses and SIDs
>>
>>
>>
>> Hi Ron,
>>
>>
>>
>> /64 prefix is a pile of addresses ... if someone would be to follow your
>> suggestion I could not allocate some blocks of that prefix on R1, then s=
ome
>> other blocks on R2 then yet more on my servers.
>>
>>
>>
>> You said:
>>
>>
>>
>> *=E2=80=9C**With a /64, if one /128 represents an IPv6 interface, as des=
cribed
>> in RFC 4291, all /128 MUST either:*
>>
>>
>>
>>    - *Represent an IPv6 interface, as described in RFC 4291, or*
>>    - *Be unassigned**=E2=80=9D*
>>
>>
>>
>> Maybe you meant to say something else:
>>
>>
>>
>> *=E2=80=9C**When a /64 is used as SRv6 locator prefix,** if one /128 rep=
resents
>> an IPv6 interface, as described in RFC 4291, all /128 MUST either:*
>>
>>
>>
>>    - *Represent an IPv6 interface, as described in RFC 4291, or*
>>    - *Be unassigned**=E2=80=9D*
>>
>> But then you sent this to SPRINT indicating that 6MAN should be the
>> audience :).
>>
>>
>>
>> Best,
>> R.
>>
>>
>>
>>
>>
>> On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica <rbonica@juniper.net> wrote:
>>
>> Robert,
>>
>>
>>
>> I=E2=80=99m having a hard time understanding exactly how I have violated=
 the
>> longest match principle. Could you provide:
>>
>>
>>
>>    - A pointer to a statement of the longest match principle
>>    - A few words regarding how I have violated it
>>
>>
>>
>>                                                               Ron
>>
>>
>>
>>
>>
>> *From:* Robert Raszuk <robert@raszuk.net>
>> *Sent:* Sunday, October 13, 2019 5:24 PM
>> *To:* Ron Bonica <rbonica@juniper.net>
>> *Cc:* SPRING WG List <spring@ietf.org>
>> *Subject:* IPv6 Addresses and SIDs
>>
>>
>>
>> Hi Ron,
>>
>>
>>
>> I disagree.
>>
>>
>>
>> Your suggestion violates longest prefix match principle in routing.
>>
>>
>>
>> It is huge waist of address space and is not specific to IPv6 at all.
>>
>>
>>
>> Let me describe the deployment case where your suggestion would cause it
>> to break:
>>
>>
>>
>> I have /64 prefix where a few  /128s from that space I allocate to local
>> interfaces making it a local v6 destinations on those nodes.
>>
>>
>>
>> However in the spirit of CIDR I still want to to use some blocks of that
>> space - say  /126 or /124 as blocks which I only use to trigger local NA=
T
>> as per rfc6296. And NAT does not require local address to be a destinati=
on
>> address so it would be a big disservice to kill such deployment option.
>>
>>
>>
>> Many thx,
>> R.
>>
>>
>>
>>
>>
>> On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica <rbonica=3D
>> 40juniper.net@dmarc.ietf.org> wrote:
>>
>> Folks,
>>
>>
>>
>> I think that we need a global rule that says:
>>
>>
>>
>> =E2=80=9CWith a /64, if one /128 represents an IPv6 interface, as descri=
bed in
>> RFC 4291, all /128 MUST either:
>>
>>
>>
>>    - Represent an IPv6 interface, as described in RFC 4291, or
>>    - Be unassigned=E2=80=9D
>>
>>
>>
>> The 6man WG will need to make such a statement since it owns RFC 4291.
>>
>>
>>
>>                                                              Ron
>>
>>
>>
>> Juniper Business Use Only
>>
>>
>>
>> Juniper Business Use Only
>>
>> _______________________________________________
>> spring mailing list
>> spring@ietf.org
>> https://www.ietf.org/mailman/listinfo/spring
>> <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/spring=
__;!8WoA6RjC81c!SEkBOAmRsYlBjRKWx1gZ4eegKkzZOKQgTtZuXxMv5TgCiZMT9xl0OH0Q8pb=
dZee9$>
>>
>> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>
--=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

--000000000000ab10a70594e4f80f
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Content-Transfer-Encoding: quoted-printable

<div><br></div><div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, Oct 14, 2019 at 4:31 PM Mark Smith &lt;<a href=3D"m=
ailto:markzzzsmith@gmail.com">markzzzsmith@gmail.com</a>&gt; wrote:<br></di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex"><div dir=3D"auto"><div><br><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, 15 Oct 2019,=
 04:19 Ron Bonica, &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_bl=
ank">rbonica@juniper.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail=
_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:=
1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div>
<p class=3D"MsoNormal">Mark,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Clearly, this does not comply with the addressing ar=
chitecture. But I think that the best we can do is to limit the damage.</p>=
</div></div></blockquote></div></div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Has SPRING tried?</div><div dir=3D"auto"><br></div><div dir=3D"au=
to">Assigning this address space to a virtual interface in the device would=
 make it comply with the RFC 4291 architecture, and also provide a handle w=
ithin the device for any other functions that could be operationally useful=
..</div><div dir=3D"auto"><br></div><div dir=3D"auto">For example, the SNMP=
 MIB traffic counters for that virtual interface could show SR traffic volu=
mes as distinct from other IPv6 traffic to, from or through the device. If =
there a different SR address spaces on the device, the could be attached to=
 different virtual interfaces, providing more discrete SR traffic counters.=
</div><div dir=3D"auto"><br></div><div dir=3D"auto">Having a virtual SR int=
erface would also provide a handle to attach a packet filter ACL to, which =
may be useful.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Having us=
ed IP encryption implementations that both did and didn&#39;t represent tra=
ffic encryption paths as virtual tunnel interfaces, the tunnel virtual inte=
rfaces implementations (also eventually adopted by the non-virtual interfac=
e implementations) far more obvious and intuitive to work with.</div><div d=
ir=3D"auto"><br></div><div dir=3D"auto">Regards,</div><div dir=3D"auto">Mar=
k..</div></div><div dir=3D"auto"><div dir=3D"auto"><br></div><div dir=3D"au=
to">[Gyan]. Since we are requiring IPv6 encapsulation anyway on the ingress=
 origin source node adding the =C2=A0SRH EH in flight we could make it a GR=
E tunnel interface which would add 4 extra GRE bytes but would provide an i=
nterface for traffic statistics and mib counters depicting the IPv6 data pl=
ane identical to a 6in6 tunnel. </div></div></blockquote><div dir=3D"auto">=
<br></div><div dir=3D"auto"><br></div><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div d=
ir=3D"auto"><div dir=3D"auto">=C2=A0Other even simpler option is to use a l=
oopback with the dedicated SID /64 prefix defines so its decoupled from any=
 physical interface.</div></div></blockquote><div dir=3D"auto"><br></div><d=
iv dir=3D"auto">Since the traffic for SRv6 reuses the same IPv6 data plane =
the traffic would go normally over the IGP routed enabled path to the next =
hop SID in the SID list so the only gain from using GRE tunnel is if you wa=
nt to be able to decouple the SRv6 traffic from other IPv6 traffic since bo=
th share the same data plane.</div><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=
=3D"auto"><div dir=3D"auto"></div></div></blockquote><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex"><div dir=3D"auto"><div dir=3D"auto"></div><div dir=3D"auto"><div c=
lass=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 =
0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US" lin=
k=3D"blue" vlink=3D"purple"><div><p class=3D"MsoNormal"><u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Ron<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><b>From:</b> Mark Smith &lt;<a href=3D"mailto:markzz=
zsmith@gmail.com" rel=3D"noreferrer" target=3D"_blank">markzzzsmith@gmail.c=
om</a>&gt; <br>
<b>Sent:</b> Monday, October 14, 2019 4:08 AM<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com" rel=3D"noreferrer" target=3D"_blank">weibin.wang@nokia-=
sbell.com</a>&gt;<br>
<b>Cc:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" rel=3D"nor=
eferrer" target=3D"_blank">rbonica@juniper.net</a>&gt;; Robert Raszuk &lt;<=
a href=3D"mailto:robert@raszuk.net" rel=3D"noreferrer" target=3D"_blank">ro=
bert@raszuk.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.o=
rg" rel=3D"noreferrer" target=3D"_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] IPv6 Addresses and SIDs<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><u></u>=C2=A0<u></u><=
/p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, 14 Oct 2019, 16:45 Wang, Weibin (NSB - CN/Sh=
anghai), &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com" rel=3D"noreferr=
er" target=3D"_blank">weibin.wang@nokia-sbell.com</a>&gt; wrote:<u></u><u><=
/u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Hi Ron:</span><span=
><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">=C2=A0</span><span>=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Make sense, If ther=
e is a dedicated IPv6 block for SRv6 SID within SRv6 domain, then trouble s=
ituation you described does
 NOT occur, because the IPv6 address covered within SRv6 SID prefix does no=
t be involved ICMPv6 ND protocol, because they are not configured under IP =
interfaces connected to
</span><span lang=3D"ZH-CN" style=3D"font-size:10.5pt;font-family:&quot;MS =
PGothic&quot;,sans-serif">=E2=80=9C</span><span style=3D"font-size:10.5pt">=
Link</span><span lang=3D"ZH-CN" style=3D"font-size:10.5pt;font-family:&quot=
;MS PGothic&quot;,sans-serif">=E2=80=9D</span><span style=3D"font-size:10.5=
pt">.=C2=A0</span><span><u></u><u></u></span></p>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">That does not comply with the IPv6 Addressing Archit=
ecture RFC.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">(I think this is the 4th time SPRING have or are ign=
oring IPv6 specifications.)<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">I also think that t=
he authors of NET-PGM draft have indicated that SRv6 SID has a separate IPv=
6 block in their Draft, but
 they don</span><span lang=3D"ZH-CN" style=3D"font-size:10.5pt;font-family:=
&quot;MS PGothic&quot;,sans-serif">=E2=80=99</span><span style=3D"font-size=
:10.5pt">t yet clearly stated which IPv6 block will be used for it.
</span><span><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">=C2=A0</span><span>=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">=C2=A0</span><span>=
<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph">
<span style=3D"font-size:10.5pt">--------------------------------------</sp=
an><span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph">
<i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,=
serif">Cheers !</span></i><span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph">
<span style=3D"font-size:10.5pt">=C2=A0</span><span><u></u><u></u></span></=
p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph">
<b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans-serif=
">=C2=A0</span></b><span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph">
<b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&quot;,=
serif">WANG Weibin=C2=A0
</span></b><span><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">=C2=A0</span><span>=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p align=3D"center" style=3D"margin:0in;margin-bottom:.0001pt;text-align:ce=
nter">
<span style=3D"font-size:7.0pt;font-family:&quot;Calibri&quot;,sans-serif;c=
olor:black">Juniper Business Use Only</span><u></u><u></u></p>
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span>From:</span></b><span> spring &lt;<a href=
=3D"mailto:spring-bounces@ietf.org" rel=3D"noreferrer" target=3D"_blank">sp=
ring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span lang=3D"ZH-CN" style=3D"font-family:&quot;MS =
Gothic&quot;">=E5=B9=B4</span><span>10</span><span lang=3D"ZH-CN" style=3D"=
font-family:&quot;MS Gothic&quot;">=E6=9C=88</span><span>14</span><span lan=
g=3D"ZH-CN" style=3D"font-family:&quot;MS Gothic&quot;">=E6=97=A5</span><sp=
an>
 9:23<br>
<b>To:</b> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" rel=3D"no=
referrer" target=3D"_blank">robert@raszuk.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" rel=3D"nor=
eferrer" target=3D"_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] IPv6 Addresses and SIDs<u></u><u></u></span></=
p>
</div>
</div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>Robert,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>Yeah, there were a few typos in my original me=
ssage. What I meant to say was:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span>If a /64 contains a SID, it MUST NOT contain any addresses that repre=
sent interfaces.<u></u><u></u></span></li><li class=3D"MsoNormal">
<span>If a /64 contains an address that represents an interface, it MUST NO=
T contain SIDs.<u></u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>If we don</span><span lang=3D"ZH-CN" style=3D"=
font-family:&quot;MS PGothic&quot;,sans-serif">=E2=80=99</span><span>t
 do this, we have to specify how nodes behave when they receive ICMPv6 NS m=
essages in which the target is:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span>A locally instantiated SID<u></u><u></u></span></li><li class=3D"MsoN=
ormal">
<span>A SID learned from the IGP<u></u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 =C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span>From:</span></b><span> Robert Raszuk &lt;<a=
 href=3D"mailto:robert@raszuk.net" rel=3D"noreferrer" target=3D"_blank">rob=
ert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 6:57 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" rel=3D"nor=
eferrer" target=3D"_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" rel=3D"nor=
eferrer" target=3D"_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: IPv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span>Hi Ron,<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>/64 prefix is a pile of addresses ... if someo=
ne would be to follow your suggestion I could not allocate some blocks of t=
hat prefix on R1,
 then some other blocks on R2 then yet more on my servers.=C2=A0<u></u><u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>You said:=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;M=
S PGothic&quot;,sans-serif">=E2=80=9C</span></b><b><span>With a /64, if one=
 /128 represents
 an IPv6 interface, as described in RFC 4291, all /128 MUST either:</span><=
/b><span><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span>=C2=A0</span></b><span><u></u><u></u></span=
></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<b><span>Represent an IPv6 interface, as described in RFC 4291, or</span></=
b><span><u></u><u></u></span></li><li class=3D"MsoNormal">
<b><span>Be unassigned</span></b><b><span lang=3D"ZH-CN" style=3D"font-fami=
ly:&quot;MS PGothic&quot;,sans-serif">=E2=80=9D</span></b><span><u></u><u><=
/u></span></li></ul>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Maybe you meant to say something else:=C2=A0<u=
></u><u></u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;M=
S PGothic&quot;,sans-serif;color:red">=E2=80=9C</span></b><b><span style=3D=
"color:red">When a /64
 is used as SRv6 locator prefix,</span></b><b><span style=3D"color:black"> =
if one /128 represents an IPv6 interface, as described in RFC 4291, all /12=
8 MUST either:</span></b><span><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"color:black">=C2=A0</span></b><spa=
n><u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<b><span style=3D"color:black">Represent an IPv6 interface, as described in=
 RFC 4291, or</span></b><span><u></u><u></u></span></li><li class=3D"MsoNor=
mal">
<b><span style=3D"color:black">Be unassigned</span></b><b><span lang=3D"ZH-=
CN" style=3D"font-family:&quot;MS PGothic&quot;,sans-serif;color:black">=E2=
=80=9D</span></b><span><u></u><u></u></span></li></ul>
</div>
<div>
<p class=3D"MsoNormal"><span>But then you sent this to SPRINT indicating th=
at 6MAN should be the audience :).=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Best,<br>
R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>On Mon, Oct 14, 2019 at 12:45 AM Ron Bonica &l=
t;<a href=3D"mailto:rbonica@juniper.net" rel=3D"noreferrer" target=3D"_blan=
k">rbonica@juniper.net</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span>Robert,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>I</span><span lang=3D"ZH-CN" style=3D"font-fam=
ily:&quot;MS PGothic&quot;,sans-serif">=E2=80=99</span><span>m
 having a hard time understanding exactly how I have violated the longest m=
atch principle. Could you provide:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span>A pointer to a statement of the longest match principle<u></u><u></u>=
</span></li><li class=3D"MsoNormal">
<span>A few words regarding how I have violated it<u></u><u></u></span></li=
></ul>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span>From:</span></b><span> Robert Raszuk &lt;<a=
 href=3D"mailto:robert@raszuk.net" rel=3D"noreferrer" target=3D"_blank">rob=
ert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Sunday, October 13, 2019 5:24 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" rel=3D"nor=
eferrer" target=3D"_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" rel=3D"nor=
eferrer" target=3D"_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> IPv6 Addresses and SIDs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>Hi Ron,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>I disagree.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Your suggestion violates=C2=A0longest prefix m=
atch principle in routing.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>It is huge waist of address space and is not s=
pecific to IPv6 at all.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Let me describe the deployment case where your=
 suggestion=C2=A0would cause it to break:=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>I have /64 prefix where a few=C2=A0 /128s from=
 that space I allocate to local interfaces making it a local v6 destination=
s on those nodes.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>However in the spirit of CIDR I still want to =
to use some blocks of that space - say=C2=A0 /126 or /124 as blocks which I=
 only use to trigger
 local NAT as per=C2=A0rfc6296. And NAT does not require local address to b=
e a destination address so it would be a big disservice to kill such deploy=
ment option.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Many thx,<br>
R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span>On Sun, Oct 13, 2019 at 10:59 PM Ron Bonica &l=
t;rbonica=3D<a href=3D"mailto:40juniper.net@dmarc.ietf.org" rel=3D"noreferr=
er" target=3D"_blank">40juniper.net@dmarc.ietf.org</a>&gt;
 wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span>Folks,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>I think that we need a global rule that says:<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"ZH-CN" style=3D"font-family:&quot;MS P=
Gothic&quot;,sans-serif">=E2=80=9C</span><span>With a /64, if one /128 repr=
esents an
 IPv6 interface, as described in RFC 4291, all /128 MUST either:<u></u><u><=
/u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
<span>Represent an IPv6 interface, as described in RFC 4291, or<u></u><u></=
u></span></li><li class=3D"MsoNormal">
<span>Be unassigned</span><span lang=3D"ZH-CN" style=3D"font-family:&quot;M=
S PGothic&quot;,sans-serif">=E2=80=9D</span><span><u></u><u></u></span></li=
></ul>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>The 6man WG will need to make such a statement=
 since it owns RFC 4291.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p align=3D"center" style=3D"margin:0in;margin-bottom:.0001pt;text-align:ce=
nter"><span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only=
</span><span><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
<p align=3D"center" style=3D"margin:0in;margin-bottom:.0001pt;text-align:ce=
nter"><span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only=
</span><span><u></u><u></u></span></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
<p class=3D"MsoNormal">_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" rel=3D"noreferrer" target=3D"_blank">spr=
ing@ietf.org</a><br>
<a href=3D"https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo=
/spring__;!8WoA6RjC81c!SEkBOAmRsYlBjRKWx1gZ4eegKkzZOKQgTtZuXxMv5TgCiZMT9xl0=
OH0Q8pbdZee9$" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/ma=
ilman/listinfo/spring</a><u></u><u></u></p>
</blockquote>
</div>
</div>
</div>
</div>
</div>

</blockquote></div></div></div>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
</blockquote></div></div>-- <br><div dir=3D"ltr" class=3D"gmail_signature" =
data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><=
div dir=3D"ltr"><div><p class=3D"MsoNormal"><span style=3D"font-family:Cali=
bri,sans-serif;color:rgb(80,0,80);background-image:initial;background-posit=
ion:initial;background-repeat:initial">Gyan S. Mishra</span><span style=3D"=
color:rgb(80,0,80);background-image:initial;background-position:initial;bac=
kground-repeat:initial"><span></span></span></p><p class=3D"MsoNormal"><spa=
n style=3D"font-family:Calibri,sans-serif;color:rgb(80,0,80);background-ima=
ge:initial;background-position:initial;background-repeat:initial">IT Networ=
k Engineering &amp;
Technology=C2=A0</span><span style=3D"color:rgb(80,0,80);background-image:i=
nitial;background-position:initial;background-repeat:initial"><span></span>=
</span></p><p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-s=
erif;color:rgb(80,0,80);background-image:initial;background-position:initia=
l;background-repeat:initial">Verizon
Communications=C2=A0Inc. (VZ)</span><span style=3D"color:rgb(80,0,80);backg=
round-image:initial;background-position:initial;background-repeat:initial">=
<span></span></span></p><p class=3D"MsoNormal"><span style=3D"font-family:C=
alibri,sans-serif;color:rgb(80,0,80);background-image:initial;background-po=
sition:initial;background-repeat:initial">13101 Columbia Pike FDC1 3rd
Floor</span><span style=3D"color:rgb(80,0,80);background-image:initial;back=
ground-position:initial;background-repeat:initial"><span></span></span></p>=
<p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-serif;color:=
rgb(80,0,80);background-image:initial;background-position:initial;backgroun=
d-repeat:initial">Silver Spring, MD 20904</span><span style=3D"color:rgb(80=
,0,80);background-image:initial;background-position:initial;background-repe=
at:initial"><span></span></span></p><p class=3D"MsoNormal"><span style=3D"f=
ont-family:Calibri,sans-serif;color:rgb(80,0,80);background-image:initial;b=
ackground-position:initial;background-repeat:initial">United States</span><=
span style=3D"color:rgb(80,0,80);background-image:initial;background-positi=
on:initial;background-repeat:initial"><span></span></span></p><p class=3D"M=
soNormal" style=3D"background-image:initial;background-position:initial;bac=
kground-repeat:initial"><span style=3D"font-family:Calibri,sans-serif;color=
:rgb(80,0,80)">Phone:=C2=A0301 502-1347</span><span></span></p><p class=3D"=
MsoNormal" style=3D"background-image:initial;background-position:initial;ba=
ckground-repeat:initial"><span style=3D"font-family:Calibri,sans-serif;colo=
r:rgb(80,0,80)">Email:=C2=A0<a href=3D"mailto:gyan.s.mishra@verizon.com" ta=
rget=3D"_blank"><span style=3D"color:rgb(17,85,204)">gyan.s.mishra@verizon.=
com</span></a></span><span></span></p><p class=3D"MsoNormal" style=3D"margi=
n:0in 0in 0.0001pt;background-image:initial;background-position:initial;bac=
kground-repeat:initial;font-size:12pt;font-family:&quot;Times New Roman&quo=
t;,serif">















</p><p class=3D"MsoNormal" style=3D"background-image:initial;background-pos=
ition:initial;background-repeat:initial"><span><span style=3D"font-family:&=
quot;Segoe UI&quot;,sans-serif;color:black;border:1pt none windowtext;paddi=
ng:0in;background-image:initial;background-position:initial;background-repe=
at:initial"><a href=3D"http://www.linkedin.com/in/networking-technologies-c=
onsultant" target=3D"_blank">www.linkedin.com/in/networking-technologies-co=
nsultant</a></span></span><span><span style=3D"font-family:&quot;Segoe UI&q=
uot;,sans-serif;border:1pt none windowtext;padding:0in;background-image:ini=
tial;background-position:initial;background-repeat:initial"><span></span></=
span></span></p></div><div><br></div></div></div></div></div></div>

--000000000000ab10a70594e4f80f--


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From: Ron Bonica <rbonica@juniper.net>
To: Robert Raszuk <robert@raszuk.net>
CC: SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming-04: Section1
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/iKC8q8DccXJiDQw_zScVc0mOKBU>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Section1
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--_000_BN7PR05MB5699943EBD23A30583BF03CDAE900BN7PR05MB5699namp_
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Robert,

A few words in the draft about the degree to which NP will respect layer bo=
undaries might be helpful.

In IETF standards, it is always best to reveal at technology's goals early,=
 often and completely. Ambiguity is rarely helpful.

                                                                           =
               Ron

From: Robert Raszuk <robert@raszuk.net>
Sent: Monday, October 14, 2019 3:07 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Sectio=
n1


> That would allay fears that we were about to see an amazing layer violati=
on.

Well P4 is here and folks are getting smarter with their hardware capabilit=
ies. My impression is that layer violation is already here - well at least =
all tools to get there are shipping :)



On Mon, Oct 14, 2019 at 8:54 PM Ron Bonica <rbonica@juniper.net<mailto:rbon=
ica@juniper.net>> wrote:
Robert,

Reading the draft, I would hope that these "non-routing" functions had some=
thing to do with the IP layer (OAM, etc). It would be helpful if you could =
provide a few examples and maybe even references to other drafts.

That would allay fears that we were about to see an amazing layer violation=
.

                                                                     Ron




From: Robert Raszuk <robert@raszuk.net<mailto:robert@raszuk.net>>
Sent: Monday, October 14, 2019 2:41 PM
To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Cc: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Sectio=
n1


>  can you give an example of a function that does go beyond mere packet ro=
uting?

An instruction(s) which triggers explicit detection of probe packet and adj=
usts the switching vector to special hardware to handle it

Examples: https://tools.ietf.org/html/draft-lapukhov-dataplane-probe-01<htt=
ps://urldefense.com/v3/__https:/tools.ietf.org/html/draft-lapukhov-dataplan=
e-probe-01__;!8WoA6RjC81c!RLBo_hyspstgm4WbFYdQCEjsDVz8qI2w71Phu9zXfJxB596vQ=
m_KQvM1wAcnNnvk$>

Thx,
R.

On Mon, Oct 14, 2019 at 8:26 PM Ron Bonica <rbonica=3D40juniper.net@dmarc.i=
etf.org<mailto:40juniper.net@dmarc.ietf.org>> wrote:
Authors,

In Section 1, you say:

"The network programming consists in combining segment routing functions, b=
oth simple and complex, to achieve a networking  objective that goes beyond=
 mere packet routing."

In your opinion, do any of the functions defined in this document go beyond=
 mere packet routing? If so, which?

If not, can you give an example of a function that does go beyond mere pack=
et routing?

                                                                           =
      Ron




Juniper Business Use Only
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Robert,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">A few words in the draft about the degree to which N=
P will respect layer boundaries might be helpful.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In IETF standards, it is always best to reveal at te=
chnology&#8217;s goals early, often and completely. Ambiguity is rarely hel=
pful.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><b>From:</b> Robert Raszuk &lt;robert@raszuk.net&gt;=
 <br>
<b>Sent:</b> Monday, October 14, 2019 3:07 PM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Cc:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming-04:=
 Section1<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal">&gt; That would allay fears that we were about to se=
e an amazing layer violation.&nbsp;&nbsp;<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Well P4 is here and folks are getting smarter with t=
heir hardware capabilities. My impression is that layer violation is alread=
y here - well at least all tools to get there are shipping :)&nbsp;<o:p></o=
:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, Oct 14, 2019 at 8:54 PM Ron Bonica &lt;<a hr=
ef=3D"mailto:rbonica@juniper.net">rbonica@juniper.net</a>&gt; wrote:<o:p></=
o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Robert,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Reading the draft, I would hope that these &#8220;non-routing&#822=
1; functions had something to do with the IP layer (OAM, etc). It would be =
helpful if you could provide a few examples and
 maybe even references to other drafts.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">That would allay fears that we were about to see an amazing layer =
violation.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b>From:</b> Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net=
" target=3D"_blank">robert@raszuk.net</a>&gt;
<br>
<b>Sent:</b> Monday, October 14, 2019 2:41 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"=
_blank">rbonica@juniper.net</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming-04:=
 Section1<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&gt;&nbsp; can you give an example of a function that does go beyo=
nd mere packet routing?&nbsp;&nbsp;<o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">An instruction(s) which triggers explicit detection of probe packe=
t and adjusts the switching vector to special hardware to handle it&nbsp;<o=
:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Examples:&nbsp;<a href=3D"https://urldefense.com/v3/__https:/tools=
.ietf.org/html/draft-lapukhov-dataplane-probe-01__;!8WoA6RjC81c!RLBo_hyspst=
gm4WbFYdQCEjsDVz8qI2w71Phu9zXfJxB596vQm_KQvM1wAcnNnvk$" target=3D"_blank">h=
ttps://tools.ietf.org/html/draft-lapukhov-dataplane-probe-01</a>&nbsp;<o:p>=
</o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Thx,<br>
R.<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">On Mon, Oct 14, 2019 at 8:26 PM Ron Bonica &lt;rbonica=3D<a href=
=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank">40juniper.net@dm=
arc.ietf.org</a>&gt; wrote:<o:p></o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">In Section 1, you say:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&#8220;The network programming consists in combining segment routi=
ng functions, both simple and complex, to achieve a networking&nbsp; object=
ive that goes beyond mere packet routing.&#8221;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">In your opinion, do any of the functions defined in this document =
go beyond mere packet routing? If so, which?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">If not, can you give an example of a function that does go beyond =
mere packet routing?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">&nbsp;<o:p></o:p></p>
<p align=3D"center" style=3D"margin:0in;margin-bottom:.0001pt;text-align:ce=
nter"><span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only=
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<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
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From: Ron Bonica <rbonica@juniper.net>
To: SPRING WG List <spring@ietf.org>
Thread-Topic: draft-ietf-spring-srv6-network-programming :Section 4.16.2
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2
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Authors,

Sorry, I meant to say USD, not USP.

                         Ron




Juniper Business Use Only
From: Ron Bonica
Sent: Monday, October 14, 2019 2:36 PM
To: SPRING WG List <spring@ietf.org>
Subject: draft-ietf-spring-srv6-network-programming :Section 4.16.2

Authors,

The USP flavor of the END, END.X and END.T functions isn't needed.

USP is the default IPv6 behavior. So, if the source node specifies SID[0] a=
s an RFC 4291 address on the SR egress node, you get the USP behavior for f=
ree.

                                                           Ron



Juniper Business Use Only

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<p class=3D"MsoNormal">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Sorry, I meant to say USD, not USP.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></p>
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<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
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<p class=3D"MsoNormal"><b>From:</b> Ron Bonica <br>
<b>Sent:</b> Monday, October 14, 2019 2:36 PM<br>
<b>To:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> draft-ietf-spring-srv6-network-programming :Section 4.16.2<=
o:p></o:p></p>
</div>
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<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The USP flavor of the END, END.X and END.T functions=
 isn&#8217;t needed.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">USP is the default IPv6 behavior. So, if the source =
node specifies SID[0] as an RFC 4291 address on the SR egress node, you get=
 the USP behavior for free.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron=
<o:p></o:p></p>
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From: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
Thread-Topic: draft-ietf-spring-srv6-network-programming :Section 4.16.2
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Date: Mon, 14 Oct 2019 23:55:14 +0000
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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">I th=
ink the USD action May be necessary, because it is relative to SRv6 SID as =
last SID in SRH, not to related to plain ipv6 address (RFC4291);<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">As p=
lain IPv6 address in DA field of IPv6 packet, it is default behavior for No=
de identified by DA to further Decapsulate packet in this case.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;spring-bounces@ietf.org&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=
=BA=DA&quot;,sans-serif">=C4=EA</span><span lang=3D"EN-US">10</span><span s=
tyle=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=D4=C2=
</span><span lang=3D"EN-US">15</span><span style=3D"font-family:&quot;=CE=
=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C8=D5</span><span lang=3D"EN-US"> =
7:03<br>
<b>To:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Authors,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sorry, I meant to say USD, not =
USP.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Ron Bonica
<br>
<b>Sent:</b> Monday, October 14, 2019 2:36 PM<br>
<b>To:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Subject:</b> draft-ietf-spring-srv6-network-programming :Section 4.16.2<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Authors,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The USP flavor of the END, END.=
X and END.T functions isn=A1=AFt needed.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">USP is the default IPv6 behavio=
r. So, if the source node specifies SID[0] as an RFC 4291 address on the SR=
 egress node, you get the USP behavior for free.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
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<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
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From: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
Thread-Topic: draft-ietf-spring-srv6-network-programming :Section 4.16.2
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Date: Tue, 15 Oct 2019 00:12:40 +0000
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References: <BN7PR05MB56996E6255053373C17A61A8AE900@BN7PR05MB5699.namprd05.prod.outlook.com> <BN7PR05MB56999544494E126CA9853186AE900@BN7PR05MB5699.namprd05.prod.outlook.com> <f7df7922c6734e168aab5570fab2630e@nokia-sbell.com>
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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Hi R=
on;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">It i=
s my understanding, as long as the IPv6 address is a SRv6 SID, then we must=
 newly define its processing rules; but I don=A1=AFt know if it is intent o=
f Authors.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Wang, Weibin (NSB - CN/Shanghai)
<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:=CB=CE=CC=E5">=C4=EA</sp=
an><span lang=3D"EN-US">10</span><span style=3D"font-family:=CB=CE=CC=E5">=
=D4=C2</span><span lang=3D"EN-US">15</span><span style=3D"font-family:=CB=
=CE=CC=E5">=C8=D5</span><span lang=3D"EN-US"> 7:55<br>
<b>To:</b> 'Ron Bonica' &lt;rbonica=3D40juniper.net@dmarc.ietf.org&gt;; SPR=
ING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> RE: draft-ietf-spring-srv6-network-programming :Section 4.1=
6.2<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">I th=
ink the USD action May be necessary, because it is relative to SRv6 SID as =
last SID in SRH, not to related to plain ipv6 address (RFC4291);<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">As p=
lain IPv6 address in DA field of IPv6 packet, it is default behavior for No=
de identified by DA to further Decapsulate packet in this case.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=
=BA=DA&quot;,sans-serif">=C4=EA</span><span lang=3D"EN-US">10</span><span s=
tyle=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=D4=C2=
</span><span lang=3D"EN-US">15</span><span style=3D"font-family:&quot;=CE=
=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C8=D5</span><span lang=3D"EN-US"> =
7:03<br>
<b>To:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Authors,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sorry, I meant to say USD, not =
USP.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Ron Bonica
<br>
<b>Sent:</b> Monday, October 14, 2019 2:36 PM<br>
<b>To:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Subject:</b> draft-ietf-spring-srv6-network-programming :Section 4.16.2<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Authors,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The USP flavor of the END, END.=
X and END.T functions isn=A1=AFt needed.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">USP is the default IPv6 behavio=
r. So, if the source node specifies SID[0] as an RFC 4291 address on the SR=
 egress node, you get the USP behavior for free.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
</body>
</html>

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From: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
To: SPRING WG List <spring@ietf.org>
Thread-Topic: questions about draft-filsfils-spring-net-pgm-extension-srv6-usid-02
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<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sorry, the prefix length is wro=
ng,&nbsp; </span>
<span lang=3D"EN-US">2001:db8:xx00::/40 advertised by Node, then 2001:db8:x=
xyy::/48 representing Node-SID and Adj-SIDs are instantiated within Node=A1=
=AFs scope.
</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-------------------------------=
-------<o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span lang=3D"EN-US" style=3D"font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
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<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-family:&quot;Times New Roman&=
quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span la=
ng=3D"EN-US" style=3D"font-size:11.0pt">From:</span></b><span lang=3D"EN-US=
" style=3D"font-size:11.0pt"> Wang, Weibin (NSB - CN/Shanghai)
<br>
<b>Sent:</b> 2019</span><span style=3D"font-size:11.0pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C4=EA</span><span lang=3D"EN-US=
" style=3D"font-size:11.0pt">10</span><span style=3D"font-size:11.0pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=D4=C2</span><span =
lang=3D"EN-US" style=3D"font-size:11.0pt">14</span><span style=3D"font-size=
:11.0pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C8=D5=
</span><span lang=3D"EN-US" style=3D"font-size:11.0pt">
 16:50<br>
<b>To:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> questions about draft-filsfils-spring-net-pgm-extension-srv=
6-usid-02<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><span lang=
=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi folks:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have read through the micro-S=
ID draft, and a confusion arise in my mind, the example in this draft only =
illustrate how the uSID carrier operate using Node-SRv6-SID, not including =
SRv6 SID representing Adj-SID. that
 is to say the uSID carrier only encoding Node-SRv6-SID in this draft, Is t=
his right from my understanding to this draft?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">As of one Node can have lots of=
 IPv6 interfaces, so we must have lots of SRv6 SIDs representing these inte=
rfaces respectively, as a result lots of SRv6 SIDs May be reserved for this=
 purpose. I don=A1=AFt see the author clearly
 organize these Adj-SIDs; I think we can further divide uSID, for example, =
if 2 bytes represent uSID, the first byte May identify Node itself, and the=
 2<sup>nd</sup> byte identify interface link (Adj-SID), so following the ex=
ample in this draft, 2001:db8/16
 representing uSID block, every prefix 2001:db8:xx00/24 can be allocated to=
 a Node, and 2001:db8:xxyy::/32 can be assigned to SRv6 SIDs representing N=
ode-SID or Adj-SID within the Node. So the Node only advertise 2001:db8:xx0=
0::/24 prefix by IGP or BGP SR-extension,
 need not advertise lots of /32 for SIDs instantiated within this Node , th=
e other Node within SRv6 domain can have lots of /24 routes which can route=
 packets to target Node, it=A1=AFs table lookup is still according to longe=
st-prefix-match.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Another question about SRv6 SID=
 significant-scope, I think TE function is one main application of SRv6, to=
pology SRv6 SIDs including Node-prefix-SID and Adj-SID have local significa=
nt within SRv6 domain controlled by
 one organization (operator), the SIDs only assist the operator to control =
and steering traffic within its controlled domain, these SRv6 SIDs need not=
 have meaningful outside the domain, so these type of SRv6 SIDs must be not=
 leaked outside of SRv6 domain,
 doing that is also helpful for security against DDOS. But the service SRv6=
 SIDs such as End.DT4 or DT6 etc. advertised by MP-BGP extension is not sam=
e with above topology SIDs, because the VPN service identified by END.DT4/6=
 My be across several ASes controlled
 by different operators, So service SIDs such as END.DT4/6 May be global si=
gnificant within open-internet-wide.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-------------------------------=
-------<o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span lang=3D"EN-US" style=3D"font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-family:&quot;Times New Roman&=
quot;,serif"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</body>
</html>

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, SPRING WG List <spring@ietf.org>
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Thread-Topic: draft-ietf-spring-segment-routing-policy
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From nobody Mon Oct 14 23:14:30 2019
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From: Huzhibo <huzhibo@huawei.com>
To: Susan Hares <shares@ndzh.com>, 'idr wg' <idr@ietf.org>, 'SPRING WG List' <spring@ietf.org>
Thread-Topic: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Subject: Re: [spring] [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Support these two drafts.


Best Regards,

Zhibo
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, October 15, 2019 2:13 AM
To: 'idr wg' <idr@ietf.org>; 'SPRING WG List' <spring@ietf.org>
Subject: Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.=
txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to=
 10/21/2019]

Greetings IDR and Spring WG

The WG Adoption for the two IDR drafts related to IDR received a level supp=
ort below the threshold to accept this draft into the IDR WG.  There were n=
o objection, but there was simply a low level of response.

This 1 week extension to the Adoption call is to let the members of both th=
e IDR and SPRING WG comment on whether these drafts have matured enough to =
be IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination =
of whether either of these two drafts have enough support to be accepted.

Thank you,  Susan  Hares
IDR co-chair

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt =
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

This begins a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019=
]

*         draft-li-bgp-ls-sr-policy-path-segment-03.txt and

*         draft-li-idr-sr-policy-path-segment-01.txt.

You can access these two drafts at the following location:

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment=
/

https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/

The authors have pointed out that the adoption of this
draft since the following  SR-MPLS Path Segment draft has been adopted:

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00

Please consider the following questions in your responses?


1)      Should this SR Policy technology be included in BGP for SR-MPLS



Spring has adopted the draft, but IDR can provide feedback

to spring about putting this technology in BGP.


2)      Is this technology a good way to implement the required

Features in BGP?



3)      Is this technology ready for adoption?



4)      Do you have any concerns about adopting this technology?



Cheers, Susan Hares

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<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#002451">Support=
 these two drafts.</span><span lang=3D"EN-US" style=3D"font-size:12.0pt;col=
or:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"xmsonormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font=
-family:&quot;Calibri&quot;,sans-serif;color:#002451">Best Regards,</span><=
span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calibri&quo=
t;,sans-serif"><o:p></o:p></span></p>
<p class=3D"xmsonormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font=
-family:&quot;Calibri&quot;,sans-serif;color:#002451">Zhibo</span><span lan=
g=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Idr [mailto:idr-bounces@ietf.org]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, October 15, 2019 2:13 AM<br>
<b>To:</b> 'idr wg' &lt;idr@ietf.org&gt;; 'SPRING WG List' &lt;spring@ietf.=
org&gt;<br>
<b>Subject:</b> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segm=
ent-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [1=
0/14 to 10/21/2019]<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Greetin=
gs IDR and Spring WG<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">The WG =
Adoption for the two IDR drafts related to IDR received a level support bel=
ow the threshold to accept this draft into the IDR WG.&nbsp; There were no =
objection, but there was simply a low level
 of response. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">This 1 =
week extension to the Adoption call is to let the members of both the IDR a=
nd SPRING WG comment on whether these drafts have matured enough to be IDR =
WG drafts. &nbsp;On 10/21/2019, the IDR chairs
 will make a determination of whether either of these two drafts have enoug=
h support to be accepted.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thank y=
ou,&nbsp; Susan&nbsp; Hares<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">IDR co-=
chair <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif"> Id=
r [<a href=3D"mailto:idr-bounces@ietf.org">mailto:idr-bounces@ietf.org</a>]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, September 17, 2019 12:35 PM<br>
<b>To:</b> 'idr wg'<br>
<b>Subject:</b> [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-=
03.txt and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This begins a 2 week WG Adoptio=
n call two related drafts [9/17 to 10/1/2019]
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.25pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">draft-li-bgp-ls-sr-poli=
cy-path-segment-03.txt and
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.25pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">draft-li-idr-sr-policy-=
path-segment-01.txt.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You can access these two drafts=
 at the following location:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/">https://datatrack=
er.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/</a><o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-sr-policy-path-segment/">https://datatracker.ietf=
.org/doc/draft-li-idr-sr-policy-path-segment/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The authors have pointed out th=
at the adoption of this
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">draft since the following &nbsp=
;SR-MPLS Path Segment draft has been adopted:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://tools.ietf.o=
rg/html/draft-ietf-spring-mpls-path-segment-00">https://tools.ietf.org/html=
/draft-ietf-spring-mpls-path-segment-00</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please consider the following q=
uestions in your responses?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">1)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Should this SR Policy t=
echnology be included in BGP for SR-MPLS
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Spring has adopted the d=
raft, but IDR can provide feedback
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">to spring about putting =
this technology in BGP.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">2)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Is this technology a go=
od way to implement the required
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Features in BGP? <o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">3)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Is this technology read=
y for adoption?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">4)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Do you have any concern=
s about adopting this technology?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cheers, Susan Hares <o:p></o:p>=
</span></p>
</div>
</body>
</html>

--_000_06CF729DA0D6854E8C1E5121AC3330DFAF418053dggemm509mbxchi_--


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To: Robert Raszuk <robert@raszuk.net>, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>
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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 Source Packet Routing in Networking WG of the IETF.

        Title           : Service Programming with Segment Routing
        Authors         : Francois Clad
                          Xiaohu Xu
                          Clarence Filsfils
                          Daniel Bernier
                          Cheng Li
                          Bruno Decraene
                          Shaowen Ma
                          Chaitanya Yadlapalli
                          Wim Henderickx
                          Stefano Salsano
	Filename        : draft-ietf-spring-sr-service-programming-00.txt
	Pages           : 31
	Date            : 2019-10-14

Abstract:
   This document defines data plane functionality required to implement
   service segments and achieve service programming in SR-enabled MPLS
   and IP networks, as described in the Segment Routing architecture.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-sr-service-programming/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-sr-service-programming-00
https://datatracker.ietf.org/doc/html/draft-ietf-spring-sr-service-programming-00


Please note that it may take a couple of minutes from the time of submission
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Internet-Drafts are also available by anonymous FTP at:
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To: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dgb2312">
<style>body { line-height: 1.5; }blockquote { margin-top: 0px; margin-botto=
m: 0px; margin-left: 0.5em; }p { margin-top: 0px; margin-bottom: 0px; }div.=
FoxDiv20191015150014714092 { }body { font-size: 10.5pt; font-family: =CE=A2=
=C8=ED=D1=C5=BA=DA; color: rgb(0, 0, 0); line-height: 1.5; }</style>
</head>
<body>
<!--[if gte mso 9]><xml>=0A=
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
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</o:shapelayout></xml><![endif]-->
<div><span></span>Where are the authors? Why should we guess here? I think =
the authors should involve in the discussion more actively, not just postin=
g a new version. We are all working hard together to polish and impove the =
draft.</div>
<div><br>
</div>
<div>Best Regards,</div>
<div>Zhenqiang Li</div>
<hr style=3D"width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" align=
=3D"left">
<div><span>
<div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt">
<div>li_zhenqiang@hotmail.com</div>
</div>
</span></div>
<blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px; margin-Left: 0.5e=
m">
<div>&nbsp;</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-F=
AMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDI=
NG-TOP: 8px">
<div><b>=B7=A2=BC=FE=C8=CB=A3=BA</b>&nbsp;<a href=3D"mailto:weibin.wang@nok=
ia-sbell.com" style=3D"color: rgb(5, 99, 193); text-decoration: underline;"=
>Wang, Weibin (NSB - CN/Shanghai)</a></div>
<div><b>=B7=A2=CB=CD=CA=B1=BC=E4=A3=BA</b>&nbsp;2019-10-15&nbsp;08:12</div>
<div><b>=CA=D5=BC=FE=C8=CB=A3=BA</b>&nbsp;<a href=3D"mailto:rbonica=3D40jun=
iper.net@dmarc.ietf.org" style=3D"color: rgb(5, 99, 193); text-decoration: =
underline;">Ron Bonica</a>;
<a href=3D"mailto:spring@ietf.org" style=3D"color: rgb(5, 99, 193); text-de=
coration: underline;">
SPRING WG List</a></div>
<div><b>=D6=F7=CC=E2=A3=BA</b>&nbsp;Re: [spring] draft-ietf-spring-srv6-net=
work-programming :Section 4.16.2</div>
</div>
</div>
<div>
<div class=3D"FoxDiv20191015150014714092"><!--[if gte mso 9]><xml>=0A=
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
<o:shapelayout v:ext=3D"edit">=0A=
<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A=
</o:shapelayout></xml><![endif]-->
<div class=3D"WordSection1" style=3D"page: WordSection1;">
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt">Hi Ron;<o:p></o:p></span></=
p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt">It is my understanding, as =
long as the IPv6 address is a SRv6 SID, then we must newly define its proce=
ssing rules; but I don=A1=AFt know if it is intent of Authors.<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<div>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------------=
-----------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Times N=
ew Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Arial&q=
uot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Times N=
ew Roman&quot;,serif">WANG Weibin
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US">From:</span></b><span lang=3D"EN-US"> Wang, Weibin =
(NSB - CN/Shanghai)
<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:=CB=CE=CC=E5">=C4=EA</sp=
an><span lang=3D"EN-US">10</span><span style=3D"font-family:=CB=CE=CC=E5">=
=D4=C2</span><span lang=3D"EN-US">15</span><span style=3D"font-family:=CB=
=CE=CC=E5">=C8=D5</span><span lang=3D"EN-US"> 7:55<br>
<b>To:</b> 'Ron Bonica' &lt;rbonica=3D40juniper.net@dmarc.ietf.org&gt;; SPR=
ING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> RE: draft-ietf-spring-srv6-network-programming :Section 4.1=
6.2<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt">I think the USD action May =
be necessary, because it is relative to SRv6 SID as last SID in SRH, not to=
 related to plain ipv6 address (RFC4291);<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt">As plain IPv6 address in DA=
 field of IPv6 packet, it is default behavior for Node identified by DA to =
further Decapsulate packet in this case.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<div>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------------=
-----------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Times N=
ew Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Arial&q=
uot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Times N=
ew Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US">From:</span></b><span lang=3D"EN-US"> spring &lt;<a=
 href=3D"mailto:spring-bounces@ietf.org" style=3D"color: rgb(5, 99, 193); t=
ext-decoration: underline;">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=
=BA=DA&quot;,sans-serif">=C4=EA</span><span lang=3D"EN-US">10</span><span s=
tyle=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=D4=C2=
</span><span lang=3D"EN-US">15</span><span style=3D"font-family:&quot;=CE=
=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C8=D5</span><span lang=3D"EN-US"> =
7:03<br>
<b>To:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" style=3D"c=
olor: rgb(5, 99, 193); text-decoration: underline;">spring@ietf.org</a>&gt;=
<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">Authors,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">Sorry, I meant to say USD, not USP.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin: 0cm 0cm 0=
.0001pt; text-align: center; font-size: 11pt; font-family: Calibri, sans-se=
rif;">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US">From:</span></b><span lang=3D"EN-US"> Ron Bonica <b=
r>
<b>Sent:</b> Monday, October 14, 2019 2:36 PM<br>
<b>To:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" style=3D"c=
olor: rgb(5, 99, 193); text-decoration: underline;">spring@ietf.org</a>&gt;=
<br>
<b>Subject:</b> draft-ietf-spring-srv6-network-programming :Section 4.16.2<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">Authors,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">The USP flavor of the END, END.X and END.T functions i=
sn=A1=AFt needed.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">USP is the default IPv6 behavior. So, if the source no=
de specifies SID[0] as an RFC 4291 address on the SR egress node, you get t=
he USP behavior for free.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin: 0cm 0cm 0=
.0001pt; text-align: center; font-size: 11pt; font-family: Calibri, sans-se=
rif;">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
</div>
</div>
</blockquote>
</body>
</html>

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From: li zhenqiang <li_zhenqiang@hotmail.com>
To: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>
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Date: Tue, 15 Oct 2019 07:18:56 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/35S09KUBknTTPsjaBWB3Uo_Kvwg>
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dgb2312">
<style>body { line-height: 1.5; }blockquote { margin-top: 0px; margin-botto=
m: 0px; margin-left: 0.5em; }p { margin-top: 0px; margin-bottom: 0px; }div.=
FoxDiv20191015150954246191 { }body { font-size: 10.5pt; font-family: =CE=A2=
=C8=ED=D1=C5=BA=DA; color: rgb(0, 0, 0); line-height: 1.5; }</style>
</head>
<body>
<!--[if gte mso 9]><xml>=0A=
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
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<div><span></span>No, USD is not needed in my understanding. The destinatio=
n node which is pointed by the DA in the outer IPv6 header knows what it sh=
ould do when it receives a packet whose DA is in its local SID table.</div>
<div><br>
</div>
<div>More discussion are needed for the flavor part in the draft.</div>
<div><br>
</div>
<div>Best Regards,</div>
<div>Zhenqiang Li</div>
<hr style=3D"width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" align=
=3D"left">
<div><span>
<div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt">
<div>li_zhenqiang@hotmail.com</div>
</div>
</span></div>
<blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px; margin-Left: 0.5e=
m">
<div>&nbsp;</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-F=
AMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDI=
NG-TOP: 8px">
<div><b>=B7=A2=BC=FE=C8=CB=A3=BA</b>&nbsp;<a href=3D"mailto:weibin.wang@nok=
ia-sbell.com" style=3D"color: rgb(5, 99, 193); text-decoration: underline;"=
>Wang, Weibin (NSB - CN/Shanghai)</a></div>
<div><b>=B7=A2=CB=CD=CA=B1=BC=E4=A3=BA</b>&nbsp;2019-10-15&nbsp;07:55</div>
<div><b>=CA=D5=BC=FE=C8=CB=A3=BA</b>&nbsp;<a href=3D"mailto:rbonica=3D40jun=
iper.net@dmarc.ietf.org" style=3D"color: rgb(5, 99, 193); text-decoration: =
underline;">Ron Bonica</a>;
<a href=3D"mailto:spring@ietf.org" style=3D"color: rgb(5, 99, 193); text-de=
coration: underline;">
SPRING WG List</a></div>
<div><b>=D6=F7=CC=E2=A3=BA</b>&nbsp;Re: [spring] draft-ietf-spring-srv6-net=
work-programming :Section 4.16.2</div>
</div>
</div>
<div>
<div class=3D"FoxDiv20191015150954246191"><!--[if gte mso 9]><xml>=0A=
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
<o:shapelayout v:ext=3D"edit">=0A=
<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A=
</o:shapelayout></xml><![endif]-->
<div class=3D"WordSection1" style=3D"page: WordSection1;">
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt">I think the USD action May =
be necessary, because it is relative to SRv6 SID as last SID in SRH, not to=
 related to plain ipv6 address (RFC4291);<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt">As plain IPv6 address in DA=
 field of IPv6 packet, it is default behavior for Node identified by DA to =
further Decapsulate packet in this case.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<div>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------------=
-----------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Times N=
ew Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Arial&q=
uot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align: justify; margin: 0cm 0cm 0.0001=
pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Times N=
ew Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p=
>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US">From:</span></b><span lang=3D"EN-US"> spring &lt;sp=
ring-bounces@ietf.org&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=
=BA=DA&quot;,sans-serif">=C4=EA</span><span lang=3D"EN-US">10</span><span s=
tyle=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=D4=C2=
</span><span lang=3D"EN-US">15</span><span style=3D"font-family:&quot;=CE=
=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C8=D5</span><span lang=3D"EN-US"> =
7:03<br>
<b>To:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">Authors,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">Sorry, I meant to say USD, not USP.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin: 0cm 0cm 0=
.0001pt; text-align: center; font-size: 11pt; font-family: Calibri, sans-se=
rif;">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<b><span lang=3D"EN-US">From:</span></b><span lang=3D"EN-US"> Ron Bonica <b=
r>
<b>Sent:</b> Monday, October 14, 2019 2:36 PM<br>
<b>To:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" style=3D"c=
olor: rgb(5, 99, 193); text-decoration: underline;">spring@ietf.org</a>&gt;=
<br>
<b>Subject:</b> draft-ietf-spring-srv6-network-programming :Section 4.16.2<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">Authors,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">The USP flavor of the END, END.X and END.T functions i=
sn=A1=AFt needed.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">USP is the default IPv6 behavior. So, if the source no=
de specifies SID[0] as an RFC 4291 address on the SR egress node, you get t=
he USP behavior for free.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
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From: li zhenqiang <li_zhenqiang@hotmail.com>
To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>
CC: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/1V3DDEbD-z0k0OETw9msoTQmXDs>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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I suggest this section be removed from this version until the community rea=
ches rough consensus.
Further, the example for PSP in the companion doc srv6-net-pgm-illustration=
 is wrong. PSP is used for END.DT4 in the companion doc while flavors are o=
nly defined for END, END.X and END.T in srv6-network-programming.

Best Regards,
Zhenqiang Li
________________________________
li_zhenqiang@hotmail.com

From: Ron Bonica<mailto:rbonica=3D40juniper.net@dmarc.ietf.org>
Date: 2019-10-15 02:42
To: SPRING WG List<mailto:spring@ietf.org>
Subject: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
Authors,

Lacking the B.INSERT and T.INSERT functions, can you describe a use-case fo=
r the PSP and USP flavors of the END, END.X and END.T functions?

                                              Ron



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<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style>body { line-height: 1.5; }blockquote { margin-top: 0px; margin-botto=
m: 0px; margin-left: 0.5em; }p { margin-top: 0px; margin-bottom: 0px; }div.=
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<!--[if gte mso 9]><xml>=0A=
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</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
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<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A=
</o:shapelayout></xml><![endif]-->
<div><span></span>I suggest this section be removed from this version until=
 the community reaches rough consensus.&nbsp;</div>
<div>Further, the example for PSP in the companion doc srv6-net-pgm-illustr=
ation&nbsp;is wrong. PSP is used for END.DT4 in the companion doc while fla=
vors are only defined for&nbsp;<span style=3D"font-family: Calibri, sans-se=
rif; font-size: 14.6667px; line-height: 22px; background-color: transparent=
;">END,
 END.X and END.T in&nbsp;</span><span style=3D"background-color: transparen=
t; font-size: 14.6667px; line-height: 22px;"><font face=3D"Calibri, sans-se=
rif">srv6-network-programming.</font></span></div>
<div><br>
</div>
<div>Best Regards,</div>
<div>Zhenqiang Li</div>
<hr style=3D"width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" align=
=3D"left">
<div><span>
<div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt">
<div>li_zhenqiang@hotmail.com</div>
</div>
</span></div>
<blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px; margin-Left: 0.5e=
m">
<div>&nbsp;</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-F=
AMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDI=
NG-TOP: 8px">
<div><b>From:</b>&nbsp;<a href=3D"mailto:rbonica=3D40juniper.net@dmarc.ietf=
.org" style=3D"color: rgb(5, 99, 193); text-decoration: underline;">Ron Bon=
ica</a></div>
<div><b>Date:</b>&nbsp;2019-10-15&nbsp;02:42</div>
<div><b>To:</b>&nbsp;<a href=3D"mailto:spring@ietf.org" style=3D"color: rgb=
(5, 99, 193); text-decoration: underline;">SPRING WG List</a></div>
<div><b>Subject:</b>&nbsp;[spring] draft-ietf-spring-srv6-network-programmi=
ng: Section 4.16</div>
</div>
</div>
<div>
<div class=3D"FoxDiv20191015152131345347"><!--[if gte mso 9]><xml>=0A=
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
<o:shapelayout v:ext=3D"edit">=0A=
<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A=
</o:shapelayout></xml><![endif]-->
<div class=3D"WordSection1" style=3D"page: WordSection1;">
<p class=3D"MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
Authors,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
Lacking the B.INSERT and T.INSERT functions, can you describe a use-case fo=
r the PSP and USP flavors of the END, END.X and END.T functions?<o:p></o:p>=
</p>
<p class=3D"MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;">
<o:p>&nbsp;</o:p></p>
<br>
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tyle=3D"font-size:7.0pt;font-family:Calibri;color:#000000">Juniper Business=
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From: li zhenqiang <li_zhenqiang@hotmail.com>
To: Robert Raszuk <robert@raszuk.net>, Gyan Mishra <hayabusagsm@gmail.com>
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Thread-Topic: Re: [spring] IPv6 Addresses and SIDs
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Date: Tue, 15 Oct 2019 07:47:24 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/XlMZub8daKHlkMQRYgS3DTan5vQ>
Subject: Re: [spring] IPv6 Addresses and SIDs
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From: Xiejingrong <xiejingrong@huawei.com>
To: Susan Hares <shares@ndzh.com>, 'idr wg' <idr@ietf.org>, 'SPRING WG List' <spring@ietf.org>
Thread-Topic: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Date: Tue, 15 Oct 2019 08:30:09 +0000
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Subject: Re: [spring] [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Hi

I support adoption of the two drafts.
Path Segment is a simple and useful identifier of a Path in SR-MPLS technol=
ogy, and the use of BGP-SRPolicy and BGP-LS for the management of Path Segm=
ent is proper to me.


1)      Should this SR Policy technology be included in BGP for SR-MPLS
Yes.


2)      Is this technology a good way to implement the required Features in=
 BGP?
Yes it is a good way to implement the required features based on the existi=
ng mechanism/addr-family.


3)      Is this technology ready for adoption?
Yes I think so.


4)      Do you have any concerns about adopting this technology?
No.


Thanks
Jingrong

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, October 15, 2019 2:13 AM
To: 'idr wg' <idr@ietf.org>; 'SPRING WG List' <spring@ietf.org>
Subject: Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.=
txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to=
 10/21/2019]

Greetings IDR and Spring WG

The WG Adoption for the two IDR drafts related to IDR received a level supp=
ort below the threshold to accept this draft into the IDR WG.  There were n=
o objection, but there was simply a low level of response.

This 1 week extension to the Adoption call is to let the members of both th=
e IDR and SPRING WG comment on whether these drafts have matured enough to =
be IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination =
of whether either of these two drafts have enough support to be accepted.

Thank you,  Susan  Hares
IDR co-chair

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt =
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

This begins a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019=
]

*         draft-li-bgp-ls-sr-policy-path-segment-03.txt and

*         draft-li-idr-sr-policy-path-segment-01.txt.

You can access these two drafts at the following location:

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment=
/

https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/

The authors have pointed out that the adoption of this
draft since the following  SR-MPLS Path Segment draft has been adopted:

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00

Please consider the following questions in your responses?


1)      Should this SR Policy technology be included in BGP for SR-MPLS



Spring has adopted the draft, but IDR can provide feedback

to spring about putting this technology in BGP.


2)      Is this technology a good way to implement the required

Features in BGP?



3)      Is this technology ready for adoption?



4)      Do you have any concerns about adopting this technology?



Cheers, Susan Hares

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--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
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<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Hi
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">I support adoption of the two drafts.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Path Segment is a simple and useful identifier of a Path in SR-MP=
LS technology, and the use of BGP-SRPolicy and BGP-LS for the management of=
 Path Segment is proper to me.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">1)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Should this SR Policy t=
echnology be included in BGP for SR-MPLS
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yes.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">2)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Is this technology a go=
od way to implement the required Features in BGP?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yes it is a good way to impleme=
nt the required features based on the existing mechanism/addr-family.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">3)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Is this technology read=
y for adoption?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Yes I think so.<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">4)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Do you have any concern=
s about adopting this technology?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">No.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Thanks<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Jingrong<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Idr [mailto:idr-bounces@ietf.org]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, October 15, 2019 2:13 AM<br>
<b>To:</b> 'idr wg' &lt;idr@ietf.org&gt;; 'SPRING WG List' &lt;spring@ietf.=
org&gt;<br>
<b>Subject:</b> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segm=
ent-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [1=
0/14 to 10/21/2019]<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Greetin=
gs IDR and Spring WG<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">The WG =
Adoption for the two IDR drafts related to IDR received a level support bel=
ow the threshold to accept this draft into the IDR WG.&nbsp; There were no =
objection, but there was simply a low level
 of response. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">This 1 =
week extension to the Adoption call is to let the members of both the IDR a=
nd SPRING WG comment on whether these drafts have matured enough to be IDR =
WG drafts. &nbsp;On 10/21/2019, the IDR chairs
 will make a determination of whether either of these two drafts have enoug=
h support to be accepted.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thank y=
ou,&nbsp; Susan&nbsp; Hares<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">IDR co-=
chair <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif"> Id=
r [<a href=3D"mailto:idr-bounces@ietf.org">mailto:idr-bounces@ietf.org</a>]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, September 17, 2019 12:35 PM<br>
<b>To:</b> 'idr wg'<br>
<b>Subject:</b> [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-=
03.txt and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This begins a 2 week WG Adoptio=
n call two related drafts [9/17 to 10/1/2019]
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.25pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">draft-li-bgp-ls-sr-poli=
cy-path-segment-03.txt and
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.25pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">draft-li-idr-sr-policy-=
path-segment-01.txt.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You can access these two drafts=
 at the following location:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/">https://datatrack=
er.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/</a><o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-sr-policy-path-segment/">https://datatracker.ietf=
.org/doc/draft-li-idr-sr-policy-path-segment/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The authors have pointed out th=
at the adoption of this
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">draft since the following &nbsp=
;SR-MPLS Path Segment draft has been adopted:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://tools.ietf.o=
rg/html/draft-ietf-spring-mpls-path-segment-00">https://tools.ietf.org/html=
/draft-ietf-spring-mpls-path-segment-00</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please consider the following q=
uestions in your responses?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo5"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">1)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Should this SR Policy t=
echnology be included in BGP for SR-MPLS
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Spring has adopted the d=
raft, but IDR can provide feedback
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">to spring about putting =
this technology in BGP.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo5"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">2)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Is this technology a go=
od way to implement the required
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Features in BGP? <o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo5"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">3)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Is this technology read=
y for adoption?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo5"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">4)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Do you have any concern=
s about adopting this technology?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cheers, Susan Hares <o:p></o:p>=
</span></p>
</div>
</body>
</html>

--_000_16253F7987E4F346823E305D08F9115AABA155B9nkgeml514mbxchi_--


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From: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
To: li zhenqiang <li_zhenqiang@hotmail.com>, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>
CC: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Date: Tue, 15 Oct 2019 08:34:39 +0000
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">I th=
ink PSP description in the draft is right, PSP action is determined and per=
formed by END (.X/.T) SID, not by END.DT4; the PSP pseudocode is defined wi=
thin END, not in END.DT4; that is not
 same with MPLS PHP action, the PHP is determined by last HOP signaling =A1=
=B0implicit NULL 3=A1=B1;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheer !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;spring-bounces@ietf.org&gt;
<b>On Behalf Of </b>li zhenqiang<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=
=BA=DA&quot;,sans-serif">=C4=EA</span><span lang=3D"EN-US">10</span><span s=
tyle=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=D4=C2=
</span><span lang=3D"EN-US">15</span><span style=3D"font-family:&quot;=CE=
=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C8=D5</span><span lang=3D"EN-US"> =
15:32<br>
<b>To:</b> Ron Bonica &lt;rbonica=3D40juniper.net@dmarc.ietf.org&gt;; sprin=
g@ietf.org<br>
<b>Cc:</b> draft-ietf-spring-srv6-network-programming &lt;draft-ietf-spring=
-srv6-network-programming@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming: Se=
ction 4.16<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;????&quot;,serif;color:black">I suggest this section be remove=
d from this version until the community reaches rough consensus.&nbsp;<o:p>=
</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;????&quot;,serif;color:black">Further, the example for PSP in =
the companion doc srv6-net-pgm-illustration&nbsp;is wrong. PSP is used for =
END.DT4 in the companion doc while flavors are only defined
 for&nbsp;</span><span lang=3D"EN-US" style=3D"color:black">END, END.X and =
END.T in&nbsp;srv6-network-programming.</span><span lang=3D"EN-US" style=3D=
"font-size:10.5pt;font-family:&quot;????&quot;,serif;color:black"><o:p></o:=
p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;????&quot;,serif;color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;????&quot;,serif;color:black">Best Regards,<o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;????&quot;,serif;color:black">Zhenqiang Li<o:p></o:p></span></=
p>
</div>
<div class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;fon=
t-family:&quot;????&quot;,serif;color:black">
<hr size=3D"1" width=3D"210" style=3D"width:157.5pt" noshade=3D"" style=3D"=
color:#B5C4DF" align=3D"left">
</span></div>
<div>
<div style=3D"margin-left:7.5pt;margin-top:7.5pt;margin-right:7.5pt;margin-=
bottom:7.5pt">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Verdana&quot;,sans-serif;color:black"><a href=3D"mailto:li_zhe=
nqiang@hotmail.com">li_zhenqiang@hotmail.com</a><o:p></o:p></span></p>
</div>
</div>
</div>
<blockquote style=3D"margin-left:6.0pt">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;????&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span lang=3D"EN-US"=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">From:</span></b><span lang=3D"EN-US" style=3D"font-size:9.0pt;font-fa=
mily:&quot;Tahoma&quot;,sans-serif;color:black">&nbsp;<a href=3D"mailto:rbo=
nica=3D40juniper.net@dmarc.ietf..org"><span style=3D"color:#0563C1">Ron
 Bonica</span></a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span lang=3D"EN-US"=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">Date:</span></b><span lang=3D"EN-US" style=3D"font-size:9.0pt;font-fa=
mily:&quot;Tahoma&quot;,sans-serif;color:black">&nbsp;2019-10-15&nbsp;02:42=
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span lang=3D"EN-US"=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">To:</span></b><span lang=3D"EN-US" style=3D"font-size:9.0pt;font-fami=
ly:&quot;Tahoma&quot;,sans-serif;color:black">&nbsp;<a href=3D"mailto:sprin=
g@ietf.org"><span style=3D"color:#0563C1">SPRING
 WG List</span></a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span lang=3D"EN-US"=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">Subject:</span></b><span lang=3D"EN-US" style=3D"font-size:9.0pt;font=
-family:&quot;Tahoma&quot;,sans-serif;color:black">&nbsp;[spring] draft-iet=
f-spring-srv6-network-programming:
 Section 4.16<o:p></o:p></span></p>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">Authors,<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">Lacking t=
he B.INSERT and T.INSERT functions, can you describe a use-case for the PSP=
 and USP flavors of the END, END.X and END.T functions?<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;????&quot;,serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"text-align:center=
"><span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Busine=
ss Use Only</span><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-famil=
y:&quot;????&quot;,serif;color:black"><o:p></o:p></span></p>
</div>
</div>
</blockquote>
</div>
</body>
</html>

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Support these 2 drafts.

Best regards.

Zhu Yongqing

=B7=A2=BC=FE=C8=CB: Idr <idr-bounces@ietf.org> =B4=FA=B1=ED Susan Hares
=B7=A2=CB=CD=CA=B1=BC=E4: 2019=C4=EA10=D4=C215=C8=D5 2:13
=CA=D5=BC=FE=C8=CB: 'idr wg' <idr@ietf.org>; 'SPRING WG List' =
<spring@ietf.org>
=D6=F7=CC=E2: Re: [Idr] Adoption: =
draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt
and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to
10/21/2019]

=20

Greetings IDR and Spring WG

=20

The WG Adoption for the two IDR drafts related to IDR received a level
support below the threshold to accept this draft into the IDR WG.  There
were no objection, but there was simply a low level of response.=20

=20

This 1 week extension to the Adoption call is to let the members of both =
the
IDR and SPRING WG comment on whether these drafts have matured enough to =
be
IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination =
of
whether either of these two drafts have enough support to be accepted.=20

=20

Thank you,  Susan  Hares

IDR co-chair=20

=20

From: Idr [ <mailto:idr-bounces@ietf.org> mailto:idr-bounces@ietf.org] =
On
Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: =
draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

=20

This begins a 2 week WG Adoption call two related drafts [9/17 to =
10/1/2019]


*	draft-li-bgp-ls-sr-policy-path-segment-03.txt and=20
*	draft-li-idr-sr-policy-path-segment-01.txt.=20

=20

You can access these two drafts at the following location:=20

=20

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segme=
nt/

=20

https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/

=20

The authors have pointed out that the adoption of this=20

draft since the following  SR-MPLS Path Segment draft has been adopted:=20

=20

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00

=20

Please consider the following questions in your responses?=20

=20

1.	Should this SR Policy technology be included in BGP for SR-MPLS=20

=20

Spring has adopted the draft, but IDR can provide feedback=20

to spring about putting this technology in BGP.

=20

2.	Is this technology a good way to implement the required=20

Features in BGP?=20

=20

3.	Is this technology ready for adoption?=20

=20

4.	Do you have any concerns about adopting this technology?=20

=20

=20

Cheers, Susan Hares=20


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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DZH-CN link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.5pt;font-family:=B5=C8=CF=DF'>Support =
these 2 drafts.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.5pt;font-family:=B5=C8=CF=DF'>Best =
regards.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:=B5=C8=CF=DF'> Zhu =
Yongqing<o:p></o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-family:=B5=C8=CF=DF'>=B7=A2=BC=FE=C8=CB<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-family:=B5=C8=CF=DF'> Idr &lt;idr-bounces@ietf.org&gt; =
</span><b><span style=3D'font-family:=B5=C8=CF=DF'>=B4=FA=B1=ED =
</span></b><span lang=3DEN-US style=3D'font-family:=B5=C8=CF=DF'>Susan =
Hares<br></span><b><span =
style=3D'font-family:=B5=C8=CF=DF'>=B7=A2=CB=CD=CA=B1=BC=E4<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-family:=B5=C8=CF=DF'> 2019</span><span =
style=3D'font-family:=B5=C8=CF=DF'>=C4=EA<span =
lang=3DEN-US>10</span>=D4=C2<span lang=3DEN-US>15</span>=C8=D5<span =
lang=3DEN-US> 2:13<br></span><b>=CA=D5=BC=FE=C8=CB<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> 'idr wg' =
&lt;idr@ietf.org&gt;; 'SPRING WG List' =
&lt;spring@ietf.org&gt;<br></span><b>=D6=F7=CC=E2<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Idr] Adoption: =
draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and =
draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to =
10/21/2019]<o:p></o:p></span></span></p></div></div><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Greetings =
IDR and Spring WG<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>The WG =
Adoption for the two IDR drafts related to IDR received a level support =
below the threshold to accept this draft into the IDR WG.&nbsp; There =
were no objection, but there was simply a low level of response. =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>This 1 week =
extension to the Adoption call is to let the members of both the IDR and =
SPRING WG comment on whether these drafts have matured enough to be IDR =
WG drafts. &nbsp;On 10/21/2019, the IDR chairs will make a determination =
of whether either of these two drafts have enough support to be =
accepted. <o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Thank =
you,&nbsp; Susan&nbsp; Hares<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>IDR =
co-chair <o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'>From:</span></=
b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'> Idr =
[</span><span lang=3DEN-US><a href=3D"mailto:idr-bounces@ietf.org"><span =
style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'>mailto:idr-bou=
nces@ietf.org</span></a></span><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'>] <b>On =
Behalf Of </b>Susan Hares<br><b>Sent:</b> Tuesday, September 17, 2019 =
12:35 PM<br><b>To:</b> 'idr wg'<br><b>Subject:</b> [Idr] Adoption: =
draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and =
draft-li-sr-policy-path-segment-01.txt [9/17 to =
10/1/2019]<o:p></o:p></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>This begins a 2 week WG Adoption call two related drafts =
[9/17 to 10/1/2019] <o:p></o:p></span></p><ul style=3D'margin-top:0cm' =
type=3Ddisc><li class=3DMsoListParagraph =
style=3D'margin-left:2.25pt;mso-list:l3 level1 lfo3'><span =
lang=3DEN-US>draft-li-bgp-ls-sr-policy-path-segment-03.txt and =
<o:p></o:p></span></li><li class=3DMsoListParagraph =
style=3D'margin-left:2.25pt;mso-list:l3 level1 lfo3'><span =
lang=3DEN-US>draft-li-idr-sr-policy-path-segment-01.txt. =
<o:p></o:p></span></li></ul><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>You can access these two drafts at the following location: =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><a =
href=3D"https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-pa=
th-segment/">https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-poli=
cy-path-segment/</a><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><a =
href=3D"https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segm=
ent/">https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segmen=
t/</a><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>The authors have pointed out that the adoption of this =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US>draft =
since the following &nbsp;SR-MPLS Path Segment draft has been adopted: =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><a =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-0=
0">https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00</a>=
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Please consider the following questions in your responses? =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><ol style=3D'margin-top:0cm' =
start=3D1 type=3D1><li class=3DMsoListParagraph =
style=3D'margin-left:0cm;mso-list:l0 level1 lfo6'><span =
lang=3DEN-US>Should this SR Policy technology be included in BGP for =
SR-MPLS <o:p></o:p></span></li></ol><p class=3DMsoListParagraph><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoListParagraph><span lang=3DEN-US>Spring has adopted the =
draft, but IDR can provide feedback <o:p></o:p></span></p><p =
class=3DMsoListParagraph><span lang=3DEN-US>to spring about putting this =
technology in BGP.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><ol style=3D'margin-top:0cm' =
start=3D2 type=3D1><li class=3DMsoListParagraph =
style=3D'margin-left:0cm;mso-list:l0 level1 lfo6'><span lang=3DEN-US>Is =
this technology a good way to implement the required =
<o:p></o:p></span></li></ol><p class=3DMsoListParagraph><span =
lang=3DEN-US>Features in BGP? <o:p></o:p></span></p><p =
class=3DMsoListParagraph><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><ol style=3D'margin-top:0cm' =
start=3D3 type=3D1><li class=3DMsoListParagraph =
style=3D'margin-left:0cm;mso-list:l0 level1 lfo6'><span lang=3DEN-US>Is =
this technology ready for adoption? <o:p></o:p></span></li></ol><p =
class=3DMsoListParagraph><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><ol style=3D'margin-top:0cm' =
start=3D4 type=3D1><li class=3DMsoListParagraph =
style=3D'margin-left:0cm;mso-list:l0 level1 lfo6'><span lang=3DEN-US>Do =
you have any concerns about adopting this technology? =
<o:p></o:p></span></li></ol><p class=3DMsoListParagraph><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Cheers, Susan Hares =
<o:p></o:p></span></p></div></body></html>
------=_NextPart_000_00C8_01D5837D.92623D00--


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Subject: Re: [spring] [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>, "cfilsfil@cisco.com" <cfilsfil@cisco.com>, "riparekh@cisco.com" <riparekh@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "zzhang@juniper.net" <zzhang@juniper.net>
CC: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Some questions regarding Replication SID
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Subject: [spring] Some questions regarding Replication SID
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Dear colleagues,
I have read the Replication SID draft<https://tools.ietf.org/html/draft-vo=
yer-spring-sr-replication-segment-00>, and I have a few questions dealing =
with possible instantiation of the Replication SOD in SR-MPLS<https://tool=
s.ietf.org/html/draft-ietf-spring-segment-routing-mpls-22>.


1.       The draft says that "each branch is abstracted to a <Downstream N=
ode, Downstream Replication-SID>".  Does that mean that the Downstream Rep=
lication-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402=
<https://tools.ietf.org/html/rfc8402>?

2.       The draft also says that "A Replication branch to a particular Do=
wnstream Node could be represented by the node's Node SID".  Does this mea=
n that the Replication Node sends the packets it receives with the Replica=
tion SID as the active segment with the labels representing the downstream=
 Node SID as the active segment across such a replication branch?

3.       The draft also says that "Replication segment is instantiated at =
Downstream nodes and at the Replication node".  Does that mean that the li=
st of SIDs associated with the specific replication Branch is pushed by th=
e Replication Node on top of the label representing the Replication SID in=
 the Downstream node of this branch?

4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

5.       The draft also says that  "A Replication segment can be either pr=
ovisioned locally on a node or programmed by a PCE". These two options loo=
k exactly the same to me from the POV of the node on which the Replication=
 segment is programmed - what, if anything, did I miss?

6.       Did you consider a possibility of advertising the Replication Seg=
ment from the Downstream nodes to the Replication one using some multicast=
 routing protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is s=
uch a possibility strictly precluded?



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be=20highly appreciated.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com


__________________________________________________________________________=
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<p class=3D"MsoNormal">Dear colleagues,<o:p></o:p></p>
<p class=3D"MsoNormal">I have read the <a href=3D"https://tools.ietf.org/h=
tml/draft-voyer-spring-sr-replication-segment-00">
Replication SID draft</a>, and I have a few questions dealing with possibl=
e instantiation of the Replication SOD in
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-m=
pls-22">SR-MPLS</a>.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span dir=3D"=
LTR"></span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot=
;,sans-serif">The draft says that &#8220;</span><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Courier New&quot;">each branch is abst=
racted to a &lt;Downstream Node, Downstream Replication-SID&gt;</span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">&#=
8221;. &nbsp;Does that mean that the </span><span lang=3D"EN" style=3D"fon=
t-size:12.0pt;font-family:&quot;Courier New&quot;">Downstream Replication-=
SID</span><span lang=3D"EN" style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"> </span><span style=3D"font-size:11.0pt;font-famil=
y:&quot;Calibri&quot;,sans-serif">is one of the SIDs defined in Sections 3=
, 4 and 5&nbsp; of <a href=3D"https://tools.ietf.org/html/rfc8402">RFC8402=
</a>? <o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span dir=3D"=
LTR"></span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot=
;,sans-serif">The draft also says that</span> &#8220;<span lang=3D"EN" sty=
le=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Replication =
branch to a particular Downstream Node could be represented by the node's =
Node </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;=
Times New Roman&quot;,serif">SID</span><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does this mean tha=
t the Replication Node sends the packets it receives with the Replication =
SID as the active segment with the labels representing the downstream Node=
 SID as the active segment across such a replication branch?<o:p></o:p></s=
pan></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span dir=3D"=
LTR"></span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot=
;,sans-serif">The draft also says that &#8220;</span><span lang=3D"EN" sty=
le=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">Replication se=
gment is instantiated at Downstream nodes and at the Replication node</spa=
n><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-ser=
if">&#8221;. &nbsp;Does that mean that the list of SIDs associated with th=
e specific replication Branch is pushed by the Replication Node on top of =
the label representing the Replication SID in the Downstream node of this =
branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo8"><![if !supportLists]><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-=
list:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </s=
pan></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Are the labels that=
 represent the Replication SID at the Downstream nodes downstream-allocate=
d by these nodes or upstream-allocated by the replication node? </span><sp=
an lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quo=
t;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span dir=3D"=
LTR"></span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot=
;,sans-serif">The draft also says that &nbsp;&#8220;</span><span lang=3D"E=
N" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Replic=
ation segment can be either provisioned locally on a node or programmed by=
 a PCE</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quo=
t;,sans-serif">&#8221;. These two options look exactly the same to me from=
 the POV of the node on which the Replication segment is programmed - what=
, if anything, did I miss?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span dir=3D"=
LTR"></span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot=
;,sans-serif">Did you consider a possibility of advertising the Replicatio=
n Segment from the Downstream nodes to the Replication one using some mult=
icast routing protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or=
 is such a possibility strictly precluded?<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiat=
ion of the Replication Segment in SR-MPLS would be highly appreciated.<o:p=
></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<br clear=3D"both">
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Date: Tue, 15 Oct 2019 15:49:42 +0200
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: SPRING WG List <spring@ietf.org>,  "=?utf-8?Q?=E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88)?=" <xiaohu.xxh@alibaba-inc.com>
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Xiaohu,

few comments:

R=46C7311 is very specific about containing routes with AIGP attribute wi=
thin=C2=A0AIGP administrative domain, while not well defined in R=46C7311=
, perhaps worth saying something=3F
The value field of the AIGP TLV in R=46C7311 is 8 octets long - draft def=
ines 4 octet value, I assume you are following R=46C8570 and R=46C7471 en=
coding=3F
Rather that making=C2=A0AIGP TLV and=C2=A0NETWORK=5FLATENCY TLV =C2=A0mut=
ually exclusive, perhaps defining how they interact, if both are present =
would be a better choice=3F
Capability Advertisement - 3rd para doesn=E2=80=99t parse, be clear if it=
 applies to labelled routes only (R=46C7311 is vague here - =22tunneling =
of some sort=E2=80=9D)
Manipulation of the Unidirectional Link delay sub-TLV in IGP=E2=80=99s co=
uld natively be done by using =C2=A0Unidirectional Link Delay TLV in R=46=
C8571.

3107 has been obsoleted by 8277

Cheers,
Jeff
On Oct 15, 2019, 11:57 AM +0200, =E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=
=85=88) <xiaohu.xxh=40alibaba-inc.com>, wrote:
>
> Hi all,
>
> I just=C2=A0recently realized that the performance routing mechanism as=
 described in this draft could facilitate the deployment of segment routi=
ng across multiple ASes of an administrative entity=C2=A0where low-latenc=
y SR paths across ASes=C2=A0are needed for carrying latency-sensitive and=
 high-priority traffic. In this way,=C2=A0there is no need=C2=A0to resort=
 to centralized TE controllers for calculating=C2=A0low-latency paths acr=
oss=C2=A0ASes.
>
> Any comments and suggestions are welcome.
>
> Best regards,
> Xiaohu
>
>
>
>
>
> > ------------------------------------------------------------------
> > =46rom:internet-drafts <internet-drafts=40ietf.org>
> > Send Time:2019=E5=B9=B410=E6=9C=8814=E6=97=A5(=E6=98=9F=E6=9C=9F=E4=B8=
=80) 13:09
> > To:i-d-announce <i-d-announce=40ietf.org>
> > Cc:idr <idr=40ietf.org>
> > Subject:=5BIdr=5D I-D Action: draft-ietf-idr-performance-routing-02.t=
xt
> >
> >
> > A=C2=A0New=C2=A0Internet-Draft=C2=A0is=C2=A0available=C2=A0from=C2=A0=
the=C2=A0on-line=C2=A0Internet-Drafts=C2=A0directories.
> > This=C2=A0draft=C2=A0is=C2=A0a=C2=A0work=C2=A0item=C2=A0of=C2=A0the=C2=
=A0Inter-Domain=C2=A0Routing=C2=A0WG=C2=A0of=C2=A0the=C2=A0IET=46.
> >
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Title=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0:=C2=A0Performance-based=C2=
=A0BGP=C2=A0Routing=C2=A0Mechanism
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Authors=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0:=C2=A0Xiaohu=C2=A0Xu
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0Shraddha=C2=A0Hegde
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0Ketan=C2=A0Talaulikar
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0Mohamed=C2=A0Boucadair
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0Christian=C2=A0Jacquenet
> > =C2=A0=46ilename=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0:=C2=A0=
draft-ietf-idr-performance-routing-02.txt
> > =C2=A0Pages=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0:=C2=A010
> > =C2=A0Date=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0:=C2=A02019-10-13
> >
> > Abstract:
> > =C2=A0=C2=A0=C2=A0The=C2=A0current=C2=A0BGP=C2=A0specification=C2=A0d=
oesn't=C2=A0use=C2=A0network=C2=A0performance=C2=A0metrics
> > =C2=A0=C2=A0=C2=A0(e.g.,=C2=A0network=C2=A0latency)=C2=A0in=C2=A0the=C2=
=A0route=C2=A0selection=C2=A0decision=C2=A0process.
> > =C2=A0=C2=A0=C2=A0This=C2=A0document=C2=A0describes=C2=A0a=C2=A0perfo=
rmance-based=C2=A0BGP=C2=A0routing=C2=A0mechanism=C2=A0in
> > =C2=A0=C2=A0=C2=A0which=C2=A0network=C2=A0latency=C2=A0metric=C2=A0is=
=C2=A0taken=C2=A0as=C2=A0one=C2=A0of=C2=A0the=C2=A0route=C2=A0selection
> > =C2=A0=C2=A0=C2=A0criteria.=C2=A0=C2=A0This=C2=A0routing=C2=A0mechani=
sm=C2=A0is=C2=A0useful=C2=A0for=C2=A0those=C2=A0server
> > =C2=A0=C2=A0=C2=A0providers=C2=A0with=C2=A0global=C2=A0reach=C2=A0to=C2=
=A0deliver=C2=A0low-latency=C2=A0network
> > =C2=A0=C2=A0=C2=A0connectivity=C2=A0services=C2=A0to=C2=A0their=C2=A0=
customers.
> >
> >
> >
> > The=C2=A0IET=46=C2=A0datatracker=C2=A0status=C2=A0page=C2=A0for=C2=A0=
this=C2=A0draft=C2=A0is:
> > https://datatracker.ietf.org/doc/draft-ietf-idr-performance-routing/
> >
> > There=C2=A0are=C2=A0also=C2=A0htmlized=C2=A0versions=C2=A0available=C2=
=A0at:
> > https://tools.ietf.org/html/draft-ietf-idr-performance-routing-02
> > https://datatracker.ietf.org/doc/html/draft-ietf-idr-performance-rout=
ing-02
> >
> > A=C2=A0diff=C2=A0from=C2=A0the=C2=A0previous=C2=A0version=C2=A0is=C2=A0=
available=C2=A0at:
> > https://www.ietf.org/rfcdiff=3Furl2=3Ddraft-ietf-idr-performance-rout=
ing-02
> >
> >
> > Please=C2=A0note=C2=A0that=C2=A0it=C2=A0may=C2=A0take=C2=A0a=C2=A0cou=
ple=C2=A0of=C2=A0minutes=C2=A0from=C2=A0the=C2=A0time=C2=A0of=C2=A0submis=
sion
> > until=C2=A0the=C2=A0htmlized=C2=A0version=C2=A0and=C2=A0diff=C2=A0are=
=C2=A0available=C2=A0at=C2=A0tools.ietf.org.
> >
> > Internet-Drafts=C2=A0are=C2=A0also=C2=A0available=C2=A0by=C2=A0anonym=
ous=C2=A0=46TP=C2=A0at:
> > ftp://ftp.ietf.org/internet-drafts/
> >
> > =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
> > Idr=C2=A0mailing=C2=A0list
> > Idr=40ietf.org
> > https://www.ietf.org/mailman/listinfo/idr
> =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
> Idr mailing list
> Idr=40ietf.org
> https://www.ietf.org/mailman/listinfo/idr

--5da5ce7e_5e884adc_cdaa
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<html xmlns=3D=22http://www.w3.org/1999/xhtml=22>
<head>
<title></title>
</head>
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<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>Xiaohu,
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>few comments:</div>
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>R=46C7311 is very specific about containing routes =
with AIGP attribute within&=23160;AIGP administrative domain, while not w=
ell defined in R=46C7311, perhaps worth saying something=3F</div>
<div dir=3D=22auto=22>The value field of the AIGP TLV in R=46C7311 is 8 o=
ctets long - draft defines 4 octet value, I assume you are following R=46=
C8570 and R=46C7471 encoding=3F<br /></div>
<div dir=3D=22auto=22>Rather that making&=23160;<span style=3D=22caret-co=
lor: rgb(39, 39, 40);=22>AIGP TLV and&=23160;</span>NETWORK=5FLATENCY TLV=
 &=23160;mutually exclusive, perhaps defining how they interact, if both =
are present would be a better choice=3F&=23160;</div>
<div dir=3D=22auto=22>Capability Advertisement - 3rd para doesn=E2=80=99t=
 parse, be clear if it applies to labelled routes only (R=46C7311 is vagu=
e here - =22tunneling of some sort=E2=80=9D) &=23160;&=23160;<br /></div>=

<div dir=3D=22auto=22>
<div dir=3D=22auto=22>Manipulation of the Unidirectional Link delay sub-T=
LV in IGP=E2=80=99s could natively be done by using &=23160;Unidirectiona=
l Link Delay TLV in R=46C8571.</div>
</div>
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>3107 has been obsoleted by 8277</div>
</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Oct 15, 2019, 11:57 AM +0200, =E5=
=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88) &lt;xiaohu.xxh=40alibaba-inc=
.com&gt;, wrote:<br />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =231abc9c;=22>
<div class=3D=22=5F=5Faliyun=5Femail=5Fbody=5Fblock=22>
<div style=3D=22line-height:1.7;font-family:Tahoma,Arial,STHeiti,SimSun;f=
ont-size:14.0px;color:=23000000;=22>
<div style=3D=22line-height:1.7;font-family:Tahoma,Arial,STHeiti,SimSun;f=
ont-size:14.0px;color:=23000000;=22>
<div style=3D=22line-height:1.7;font-family:Tahoma,Arial,STHeiti,SimSun;f=
ont-size:14.0px;color:=23000000;=22>
<div style=3D=22clear:both;=22><br /></div>
<div style=3D=22clear:both;=22>Hi all,</div>
<div style=3D=22clear:both;=22><br /></div>
<div style=3D=22clear:both;=22>I just&=23160;recently realized that the p=
erformance routing mechanism as described in this draft could facilitate =
the deployment of segment routing across multiple ASes of an administrati=
ve entity&=23160;where low-latency SR paths across ASes&=23160;are needed=
 for carrying latency-sensitive and high-priority traffic. In this way,&=23=
160;there is no need&=23160;to resort to centralized TE controllers for c=
alculating&=23160;low-latency paths across&=23160;ASes.&=23160;</div>
<div style=3D=22clear:both;=22><br /></div>
<div style=3D=22clear:both;=22>Any comments and suggestions are welcome.<=
/div>
<div style=3D=22clear:both;=22><br /></div>
<div style=3D=22clear:both;=22>Best regards,</div>
<div style=3D=22clear:both;=22>Xiaohu</div>
<div style=3D=22clear:both;=22><br /></div>
<div style=3D=22clear:both;=22><br /></div>
<div style=3D=22clear:both;=22><br /></div>
<div style=3D=22clear:both;=22><br /></div>
<div style=3D=22line-height:20.0px;clear:both;=22><br /></div>
</div>
</div>
<blockquote class=3D=22spark=5Fquote=22 style=3D=22margin: 5px 5px; paddi=
ng-left: 10px; border-left: thin solid =23e67e22;=22>
<div style=3D=22clear:both;=22>------------------------------------------=
------------------------</div>
<div style=3D=22clear:both;=22>=46rom:internet-drafts &lt;internet-drafts=
=40ietf.org&gt;</div>
<div style=3D=22clear:both;=22>Send Time:2019=E5=B9=B410=E6=9C=8814=E6=97=
=A5(=E6=98=9F=E6=9C=9F=E4=B8=80) 13:09</div>
<div style=3D=22clear:both;=22>To:i-d-announce &lt;i-d-announce=40ietf.or=
g&gt;</div>
<div style=3D=22clear:both;=22>Cc:idr &lt;idr=40ietf.org&gt;</div>
<div style=3D=22clear:both;=22>Subject:=5BIdr=5D I-D Action: draft-ietf-i=
dr-performance-routing-02.txt</div>
<div style=3D=22clear:both;=22><br /></div>
<br />
A&=23160;New&=23160;Internet-Draft&=23160;is&=23160;available&=23160;from=
&=23160;the&=23160;on-line&=23160;Internet-Drafts&=23160;directories.<br =
/>
This&=23160;draft&=23160;is&=23160;a&=23160;work&=23160;item&=23160;of&=23=
160;the&=23160;Inter-Domain&=23160;Routing&=23160;WG&=23160;of&=23160;the=
&=23160;IET=46.<br />
<br />
&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;Title&=23=
160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=231=
60;&=23160;:&=23160;Performance-based&=23160;BGP&=23160;Routing&=23160;Me=
chanism<br />
&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;Authors&=23=
160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;:&=23=
160;Xiaohu&=23160;Xu<br />
&=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;Shraddha&=231=
60;Hegde<br />
&=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;Ketan&=23160;=
Talaulikar<br />
&=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;Mohamed&=2316=
0;Boucadair<br />
&=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;Christian&=23=
160;Jacquenet<br />
&=23160;=46ilename&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160=
;&=23160;:&=23160;draft-ietf-idr-performance-routing-02.txt<br />
&=23160;Pages&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23=
160;&=23160;&=23160;&=23160;:&=23160;10<br />
&=23160;Date&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=231=
60;&=23160;&=23160;&=23160;&=23160;:&=23160;2019-10-13<br />
<br />
Abstract:<br />
&=23160;&=23160;&=23160;The&=23160;current&=23160;BGP&=23160;specificatio=
n&=23160;doesn't&=23160;use&=23160;network&=23160;performance&=23160;metr=
ics<br />
&=23160;&=23160;&=23160;(e.g.,&=23160;network&=23160;latency)&=23160;in&=23=
160;the&=23160;route&=23160;selection&=23160;decision&=23160;process.<br =
/>
&=23160;&=23160;&=23160;This&=23160;document&=23160;describes&=23160;a&=23=
160;performance-based&=23160;BGP&=23160;routing&=23160;mechanism&=23160;i=
n<br />
&=23160;&=23160;&=23160;which&=23160;network&=23160;latency&=23160;metric=
&=23160;is&=23160;taken&=23160;as&=23160;one&=23160;of&=23160;the&=23160;=
route&=23160;selection<br />
&=23160;&=23160;&=23160;criteria.&=23160;&=23160;This&=23160;routing&=231=
60;mechanism&=23160;is&=23160;useful&=23160;for&=23160;those&=23160;serve=
r<br />
&=23160;&=23160;&=23160;providers&=23160;with&=23160;global&=23160;reach&=
=23160;to&=23160;deliver&=23160;low-latency&=23160;network<br />
&=23160;&=23160;&=23160;connectivity&=23160;services&=23160;to&=23160;the=
ir&=23160;customers.<br />
<br />
<br />
<br />
The&=23160;IET=46&=23160;datatracker&=23160;status&=23160;page&=23160;for=
&=23160;this&=23160;draft&=23160;is:<br />
<a href=3D=22https://datatracker.ietf.org/doc/draft-ietf-idr-performance-=
routing/=22 target=3D=22=5Fblank=22>https://datatracker.ietf.org/doc/draf=
t-ietf-idr-performance-routing/</a><br />
<br />
There&=23160;are&=23160;also&=23160;htmlized&=23160;versions&=23160;avail=
able&=23160;at:<br />
<a href=3D=22https://tools.ietf.org/html/draft-ietf-idr-performance-routi=
ng-02=22 target=3D=22=5Fblank=22>https://tools.ietf.org/html/draft-ietf-i=
dr-performance-routing-02</a><br />
<a href=3D=22https://datatracker.ietf.org/doc/html/draft-ietf-idr-perform=
ance-routing-02=22 target=3D=22=5Fblank=22>https://datatracker.ietf.org/d=
oc/html/draft-ietf-idr-performance-routing-02</a><br />
<br />
A&=23160;diff&=23160;from&=23160;the&=23160;previous&=23160;version&=2316=
0;is&=23160;available&=23160;at:<br />
<a href=3D=22https://www.ietf.org/rfcdiff=3Furl2=3Ddraft-ietf-idr-perform=
ance-routing-02=22 target=3D=22=5Fblank=22>https://www.ietf.org/rfcdiff=3F=
url2=3Ddraft-ietf-idr-performance-routing-02</a><br />
<br />
<br />
Please&=23160;note&=23160;that&=23160;it&=23160;may&=23160;take&=23160;a&=
=23160;couple&=23160;of&=23160;minutes&=23160;from&=23160;the&=23160;time=
&=23160;of&=23160;submission<br />
until&=23160;the&=23160;htmlized&=23160;version&=23160;and&=23160;diff&=23=
160;are&=23160;available&=23160;at&=23160;tools.ietf.org.<br />
<br />
Internet-Drafts&=23160;are&=23160;also&=23160;available&=23160;by&=23160;=
anonymous&=23160;=46TP&=23160;at:<br />
<a href=3D=22ftp://ftp.ietf.org/internet-drafts/=22 target=3D=22=5Fblank=22=
>ftp://ftp.ietf.org/internet-drafts/</a><br />
<br />
=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<br />
Idr&=23160;mailing&=23160;list<br />
Idr=40ietf.org<br />
<a href=3D=22https://www.ietf.org/mailman/listinfo/idr=22 target=3D=22=5F=
blank=22>https://www.ietf.org/mailman/listinfo/idr</a></blockquote>
</div>
</div>
=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<br />
Idr mailing list<br />
Idr=40ietf.org<br />
https://www.ietf.org/mailman/listinfo/idr<br /></blockquote>
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>, "cfilsfil@cisco.com" <cfilsfil@cisco.com>, "riparekh@cisco.com" <riparekh@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "zzhang@juniper.net" <zzhang@juniper.net>
CC: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Some questions regarding Replication SID
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Date: Tue, 15 Oct 2019 14:34:45 +0000
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Subject: Re: [spring] Some questions regarding Replication SID
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Dear colleagues,
More of the same...
Pleade note that if the anser to #3 in my original message is positive, th=
en the statement in the draft that say the Replication Segment is similar =
to the Binding segment srems to be inaccurate.

My 2c.

Get Outlook for Android<https://aka.ms/ghei36>

________________________________
From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Sent: Tuesday, October 15, 2019, 16:30
To: daniel.voyer@bell.ca; cfilsfil@cisco.com; riparekh@cisco.com; hooman.b=
idgoli@nokia.com; zzhang@juniper.net
Cc: spring@ietf.org
Subject: Some questions regarding Replication SID

Dear colleagues,
I have read the Replication SID draft<https://tools.ietf.org/html/draft-vo=
yer-spring-sr-replication-segment-00>, and I have a few questions dealing =
with possible instantiation of the Replication SOD in SR-MPLS<https://tool=
s.ietf.org/html/draft-ietf-spring-segment-routing-mpls-22>.


1.       The draft says that =93each branch is abstracted to a <Downstream=
 Node, Downstream Replication-SID>=94.  Does that mean that the Downstream=
 Replication-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC=
8402<https://tools.ietf.org/html/rfc8402>?

2.       The draft also says that =93A Replication branch to a particular =
Downstream Node could be represented by the node's Node SID=94.  Does this=
 mean that the Replication Node sends the packets it receives with the Rep=
lication SID as the active segment with the labels representing the downst=
ream Node SID as the active segment across such a replication branch?

3.       The draft also says that =93Replication segment is instantiated a=
t Downstream nodes and at the Replication node=94.  Does that mean that th=
e list of SIDs associated with the specific replication Branch is pushed b=
y the Replication Node on top of the label representing the Replication SI=
D in the Downstream node of this branch?

4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

5.       The draft also says that  =93A Replication segment can be either =
provisioned locally on a node or programmed by a PCE=94. These two options=
 look exactly the same to me from the POV of the node on which the Replica=
tion segment is programmed - what, if anything, did I miss?

6.       Did you consider a possibility of advertising the Replication Seg=
ment from the Downstream nodes to the Replication one using some multicast=
 routing protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is s=
uch a possibility strictly precluded?



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com



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<div style=3D"color: rgb(33, 33, 33); background-color: rgb(255, 255, 255)=
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Dear colleagues,</div>
<div style=3D"color: rgb(33, 33, 33); background-color: rgb(255, 255, 255)=
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More of the same...</div>
<div style=3D"color: rgb(33, 33, 33); background-color: rgb(255, 255, 255)=
; text-align: left;" dir=3D"ltr">
Pleade note that if the anser to #3 in my original message is positive, th=
en the statement in the draft that say the Replication Segment is similar =
to the Binding segment srems to be inaccurate.</div>
<div style=3D"color: rgb(33, 33, 33); background-color: rgb(255, 255, 255)=
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<br>
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<div style=3D"color: rgb(33, 33, 33); background-color: rgb(255, 255, 255)=
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My 2c.</div>
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Get <a href=3D"https://aka.ms/ghei36">Outlook for Android</a></div>
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<div id=3D"divRplyFwdMsg"><strong>From:</strong> Alexander Vainshtein &lt;=
Alexander.Vainshtein@ecitele.com&gt;<br>
<strong>Sent:</strong> Tuesday, October 15, 2019, 16:30<br>
<strong>To:</strong> daniel.voyer@bell.ca; cfilsfil@cisco.com; riparekh@ci=
sco.com; hooman.bidgoli@nokia.com; zzhang@juniper.net<br>
<strong>Cc:</strong> spring@ietf.org<br>
<strong>Subject:</strong> Some questions regarding Replication SID<br>
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<p class=3D"MsoNormal">Dear colleagues,</p>
<p class=3D"MsoNormal">I have read the <a href=3D"https://tools.ietf.org/h=
tml/draft-voyer-spring-sr-replication-segment-00">
Replication SID draft</a>, and I have a few questions dealing with possibl=
e instantiation of the Replication SOD in
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-m=
pls-22">SR-MPLS</a>.</p>
<p class=3D"MsoNormal">&nbsp;</p>
<pre style=3D"margin-left:54.0pt; text-indent:-18.0pt; page-break-before:a=
lways"><span style=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sa=
ns-serif"><span style=3D"">1.<span style=3D"font:7.0pt &quot;Times New Rom=
an&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span =
dir=3D"LTR"></span><span style=3D"font-size:11.0pt; font-family:&quot;Cali=
bri&quot;,sans-serif">The draft says that =93</span><span lang=3D"EN" styl=
e=3D"font-size:12.0pt; font-family:&quot;Courier New&quot;">each branch is=
 abstracted to a &lt;Downstream Node, Downstream Replication-SID&gt;</span=
><span style=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sans-ser=
if">=94. &nbsp;Does that mean that the </span><span lang=3D"EN" style=3D"f=
ont-size:12.0pt; font-family:&quot;Courier New&quot;">Downstream Replicati=
on-SID</span><span lang=3D"EN" style=3D"font-size:11.0pt; font-family:&quo=
t;Calibri&quot;,sans-serif"> </span><span style=3D"font-size:11.0pt; font-=
family:&quot;Calibri&quot;,sans-serif">is one of the SIDs defined in Secti=
ons 3, 4 and 5&nbsp; of <a href=3D"https://tools.ietf.org/html/rfc8402">RF=
C8402</a>? </span></pre>
<pre style=3D"margin-left:54.0pt; text-indent:-18.0pt; page-break-before:a=
lways"><span style=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sa=
ns-serif"><span style=3D"">2.<span style=3D"font:7.0pt &quot;Times New Rom=
an&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span =
dir=3D"LTR"></span><span style=3D"font-size:11.0pt; font-family:&quot;Cali=
bri&quot;,sans-serif">The draft also says that</span> =93<span lang=3D"EN"=
 style=3D"font-size:12.0pt; font-family:&quot;Courier New&quot;">A Replica=
tion branch to a particular Downstream Node could be represented by the no=
de's Node </span><span lang=3D"EN" style=3D"font-size:12.0pt; font-family:=
&quot;Times New Roman&quot;,serif">SID</span><span style=3D"font-size:11.0=
pt; font-family:&quot;Calibri&quot;,sans-serif">=94. &nbsp;Does this mean =
that the Replication Node sends the packets it receives with the Replicati=
on SID as the active segment with the labels representing the downstream N=
ode SID as the active segment across such a replication branch?</span></pr=
e>
<pre style=3D"margin-left:54.0pt; text-indent:-18.0pt; page-break-before:a=
lways"><span style=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sa=
ns-serif"><span style=3D"">3.<span style=3D"font:7.0pt &quot;Times New Rom=
an&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span =
dir=3D"LTR"></span><span style=3D"font-size:11.0pt; font-family:&quot;Cali=
bri&quot;,sans-serif">The draft also says that =93</span><span lang=3D"EN"=
 style=3D"font-size:12.0pt; font-family:&quot;Courier New&quot;">Replicati=
on segment is instantiated at Downstream nodes and at the Replication node=
</span><span style=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sa=
ns-serif">=94. &nbsp;Does that mean that the list of SIDs associated with =
the specific replication Branch is pushed by the Replication Node on top o=
f the label representing the Replication SID in the Downstream node of thi=
s branch?</span></pre>
<pre style=3D"margin-left:54.0pt; text-indent:-18.0pt; page-break-before:a=
lways"><span lang=3D"EN" style=3D"font-size:12.0pt; font-family:&quot;Cour=
ier New&quot;"><span style=3D"">4.<span style=3D"font:7.0pt &quot;Times Ne=
w Roman&quot;"> </span></span></span><span dir=3D"LTR"></span><span style=3D=
"font-size:11.0pt; font-family:&quot;Calibri&quot;,sans-serif">Are the lab=
els that represent the Replication SID at the Downstream nodes downstream-=
allocated by these nodes or upstream-allocated by the replication node? </=
span><span lang=3D"EN" style=3D"font-size:12.0pt; font-family:&quot;Courie=
r New&quot;"></span></pre>
<pre style=3D"margin-left:54.0pt; text-indent:-18.0pt; page-break-before:a=
lways"><span style=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sa=
ns-serif"><span style=3D"">5.<span style=3D"font:7.0pt &quot;Times New Rom=
an&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span =
dir=3D"LTR"></span><span style=3D"font-size:11.0pt; font-family:&quot;Cali=
bri&quot;,sans-serif">The draft also says that &nbsp;=93</span><span lang=3D=
"EN" style=3D"font-size:12.0pt; font-family:&quot;Courier New&quot;">A Rep=
lication segment can be either provisioned locally on a node or programmed=
 by a PCE</span><span style=3D"font-size:11.0pt; font-family:&quot;Calibri=
&quot;,sans-serif">=94. These two options look exactly the same to me from=
 the POV of the node on which the Replication segment is programmed - what=
, if anything, did I miss?</span></pre>
<pre style=3D"margin-left:54.0pt; text-indent:-18.0pt; page-break-before:a=
lways"><span style=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sa=
ns-serif"><span style=3D"">6.<span style=3D"font:7.0pt &quot;Times New Rom=
an&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span =
dir=3D"LTR"></span><span style=3D"font-size:11.0pt; font-family:&quot;Cali=
bri&quot;,sans-serif">Did you consider a possibility of advertising the Re=
plication Segment from the Downstream nodes to the Replication one using s=
ome multicast routing protocol (e.g., creating a SR-MPLS replacement for m=
LDP)? Or is such a possibility strictly precluded?</span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt; f=
ont-family:&quot;Calibri&quot;,sans-serif">&nbsp;</span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt; f=
ont-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantia=
tion of the Replication Segment in SR-MPLS would be highly appreciated.</s=
pan></pre>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,</p>
<p class=3D"MsoNormal">Sasha</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Office: &#43;972-39266302</p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302</p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com=
</p>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<br>
</div>
</div>
<br clear=3D"both">
__________________________________________________________________________=
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From: Ron Bonica <rbonica@juniper.net>
To: li zhenqiang <li_zhenqiang@hotmail.com>, "spring@ietf.org" <spring@ietf.org>
CC: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Date: Tue, 15 Oct 2019 14:55:55 +0000
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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+1



Juniper Business Use Only
From: li zhenqiang <li_zhenqiang@hotmail.com>
Sent: Tuesday, October 15, 2019 3:32 AM
To: Ron Bonica <rbonica@juniper.net>; spring@ietf.org
Cc: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-netw=
ork-programming@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4=
.16

I suggest this section be removed from this version until the community rea=
ches rough consensus.
Further, the example for PSP in the companion doc srv6-net-pgm-illustration=
 is wrong. PSP is used for END.DT4 in the companion doc while flavors are o=
nly defined for END, END.X and END.T in srv6-network-programming.

Best Regards,
Zhenqiang Li
________________________________
li_zhenqiang@hotmail.com<mailto:li_zhenqiang@hotmail.com>

From: Ron Bonica<mailto:rbonica=3D40juniper.net@dmarc.ietf..org>
Date: 2019-10-15 02:42
To: SPRING WG List<mailto:spring@ietf.org>
Subject: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
Authors,

Lacking the B.INSERT and T.INSERT functions, can you describe a use-case fo=
r the PSP and USP flavors of the END, END.X and END.T functions?

                                              Ron



Juniper Business Use Only

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<p class=3D"MsoNormal">&#43;1<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"text-align:center=
"><span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</sp=
an><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> li zhenqiang &lt;li_zhenqiang@hotmail.c=
om&gt; <br>
<b>Sent:</b> Tuesday, October 15, 2019 3:32 AM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;; spring@ietf.org<br>
<b>Cc:</b> draft-ietf-spring-srv6-network-programming &lt;draft-ietf-spring=
-srv6-network-programming@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming: Se=
ction 4.16<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">I suggest this section be removed from this ver=
sion until the community reaches rough consensus.&nbsp;<o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">Further, the example for PSP in the companion d=
oc srv6-net-pgm-illustration&nbsp;is wrong. PSP is used for END.DT4 in the =
companion doc while flavors are only defined for&nbsp;</span><span style=3D=
"color:black">END,
 END.X and END.T in&nbsp;srv6-network-programming.</span><span style=3D"fon=
t-size:10.5pt;font-family:&quot;????&quot;,serif;color:black"><o:p></o:p></=
span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">Best Regards,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">Zhenqiang Li<o:p></o:p></span></p>
</div>
<div>
<div class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
????&quot;,serif;color:black">
<hr size=3D"1" width=3D"210" style=3D"width:157.5pt" noshade=3D"" style=3D"=
color:#B5C4DF" align=3D"left">
</span></div>
</div>
<div>
<div style=3D"margin-left:7.5pt;margin-top:7.5pt;margin-right:7.5pt;margin-=
bottom:7.5pt">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ve=
rdana&quot;,sans-serif;color:black"><a href=3D"mailto:li_zhenqiang@hotmail.=
com">li_zhenqiang@hotmail.com</a><o:p></o:p></span></p>
</div>
</div>
</div>
<blockquote style=3D"margin-left:6.0pt;margin-top:5.0pt;margin-bottom:5.0pt=
">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span style=3D"font-=
size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:black">From:</sp=
an></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-s=
erif;color:black">&nbsp;<a href=3D"mailto:rbonica=3D40juniper.net@dmarc.iet=
f..org"><span style=3D"color:#0563C1">Ron
 Bonica</span></a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span style=3D"font-=
size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:black">Date:</sp=
an></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-s=
erif;color:black">&nbsp;2019-10-15&nbsp;02:42<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span style=3D"font-=
size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:black">To:</span=
></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-ser=
if;color:black">&nbsp;<a href=3D"mailto:spring@ietf.org"><span style=3D"col=
or:#0563C1">SPRING
 WG List</span></a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span style=3D"font-=
size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:black">Subject:<=
/span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,san=
s-serif;color:black">&nbsp;[spring] draft-ietf-spring-srv6-network-programm=
ing:
 Section 4.16<o:p></o:p></span></p>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">Authors,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">Lacking the B.INSERT and=
 T.INSERT functions, can you describe a use-case for the PSP and USP flavor=
s of the END, END.X and END.T functions?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"text-align:center=
"><span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</sp=
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:black"><o:p></o:p></span></p>
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: Ron Bonica <rbonica@juniper.net>, li zhenqiang <li_zhenqiang@hotmail.com>,  "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, "spring@ietf.org" <spring@ietf.org>
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Date: Tue, 15 Oct 2019 16:44:20 +0000
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2
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To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
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To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
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To: li zhenqiang <li_zhenqiang@hotmail.com>, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>
CC: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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From: Ron Bonica <rbonica@juniper.net>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming-04: Section 2
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Section 2
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Pablo,

I am sure that you have read RFC 8200 carefully enough to have noticed the =
following text:


"Each extension header should occur at most once, except for the Destinatio=
n Options header, which should occur at most twice (once before a Routing h=
eader and once before the upper-layer header).

This rule addresses the number of extension headers of any given type that =
can appear in a single packet. A packet that contains one IP header and two=
 routing headers would violate this rule.

You quote the following text, also from RFC 8200, omitting the final senten=
ces:


"IPv6 nodes must accept and attempt to process extension headers in any ord=
er and occurring any number of times in the same packet, except for the Hop=
-by-Hop Options header, which is restricted to appear immediately after an =
IPv6 header only.  Nonetheless, it is strongly advised that sources of IPv6=
 packets adhere to the above recommended order until and unless subsequent =
specifications revise

that recommendation."

Is it your intent to ignore the strong advice of RFC 8200 without offering =
any justification?

                                                                           =
                      Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
Sent: Tuesday, October 15, 2019 12:45 PM
To: Ron Bonica <rbonica@juniper.net>; SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Sectio=
n 2

Ron,

That sentence is there on purpose. RFC8200:
   IPv6 nodes must accept and attempt to process extension headers in
   any order and occurring any number of times in the same packet

I will update that sentence in the next revision of the draft to make it mo=
re formal and include the normative reference:
"As per [RFC8200], multiple occurrences of the SRH might be present in the =
same IPv6 header."

Cheers,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Ron Bonica <rbonica=3D40juniper.net@dmarc.ietf.org<mailto:rbonica=
=3D40juniper.net@dmarc.ietf.org>>
Date: Monday, 14 October 2019 at 20:28
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: [spring] draft-ietf-spring-srv6-network-programming-04: Section 2

Authors,

In Section 2 of draft-ietf-spring-srv6-network-programming-04, you say:

"SRH: Segment Routing Header as defined in  [I-D.ietf-6man-segment-routing-=
header].  We assume that the SRH may be present multiple times inside each =
packet."

Did you mean to remove the final sentence?

                                     Ron



Juniper Business Use Only

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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I am sure that you have read RFC 8200 carefully enou=
gh to have noticed the following text:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><span style=3D"color:black">&#8220;Each extension header should occur =
at most once, except for the Destination Options header, which should occur=
 at most twice (once before a Routing header and once before the upper-laye=
r header).<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This rule addresses the number of extension headers =
of any given type that can appear in a single packet. A packet that contain=
s one IP header and two routing headers would violate this rule.&nbsp;
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">You quote the following text, also from RFC 8200, om=
itting the final sentences:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><span style=3D"font-family:&quot;Calibri&quot;,sans-serif">&#8220;</sp=
an><span style=3D"color:black">IPv6 nodes must accept and attempt to proces=
s extension headers in any order and occurring any number of times in the s=
ame packet, except for the Hop-by-Hop Options header, which is restricted t=
o appear immediately after an IPv6 header only.&nbsp; Nonetheless, it is st=
rongly advised that sources of IPv6 packets adhere to the above recommended=
 order until and unless subsequent specifications revise<o:p></o:p></span><=
/pre>
<pre><span style=3D"color:black">that recommendation.&#8221;<o:p></o:p></sp=
an></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Is it your intent to ignore the strong advice of RFC=
 8200 without offering any justification?
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;pcamaril=
@cisco.com&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 12:45 PM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;; SPRING WG List &lt;sprin=
g@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming-04:=
 Section 2<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Ron,<span style=3D"font-size:10.0pt"><o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">That sentence is there on purpose. RFC8200:<o:p></o:=
p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp; IPv6 nodes must accept and attempt to process exte=
nsion headers in<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp; any order and occurring any number of times in the=
 same packet<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I will update that sentence in the next revision of =
the draft to make it more formal and include the normative reference:<o:p><=
/o:p></p>
<p class=3D"MsoNormal">&#8220;As per [RFC8200], multiple occurrences of the=
 SRH might be present in the same IPv6 header.&#8221;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Cheers,<o:p></o:p></p>
<p class=3D"MsoNormal">Pablo.<o:p></o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-si=
ze:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">spring &lt;<a href=
=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&gt; on beha=
lf of Ron Bonica &lt;<a href=3D"mailto:rbonica=3D40juniper.net@dmarc.ietf.o=
rg">rbonica=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Monday, 14 October 2019 at 20:28<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Subject: </b>[spring] draft-ietf-spring-srv6-network-programming-04: Sec=
tion 2<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">In Section 2 of draft-iet=
f-spring-srv6-network-programming-04, you say:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&#8220;SRH: Segment Routi=
ng Header as defined in&nbsp; [I-D.ietf-6man-segment-routing-header].&nbsp;=
 We assume that the SRH may be present multiple times inside each packet.&#=
8221;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Did you mean to remove th=
e final sentence?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<span lang=3D"ES">Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
</div>
</body>
</html>

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From: Ron Bonica <rbonica@juniper.net>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2
Thread-Index: AQHVg3fRwppu6xvn0kqBwx2bjn5c3qdcX5tQ
Date: Tue, 15 Oct 2019 23:59:49 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/nAK1vUPANQDz09GFsta0KYx1o2k>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2
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Pablo,

You haven't answered my question.

Why specify a USD flavor of END, END.X and END.T when you can get the exact=
 same behavior by populating SID[0] with an IPv6 address that identifies a =
real interface?

USD seems redundant.

                                        Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
Sent: Tuesday, October 15, 2019 12:45 PM
To: Ron Bonica <rbonica@juniper.net>; SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4=
.16.2

Ron,

The USD flavour is used in any T.Encaps policy applied within the SR domain=
.

Cheers,
Pablo.

From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Ron Bonica <rbonica=3D40juniper.net@dmarc.ietf.org<mailto:rbonica=
=3D40juniper.net@dmarc.ietf.org>>
Date: Tuesday, 15 October 2019 at 01:03
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4=
.16.2

Authors,

Sorry, I meant to say USD, not USP.

                         Ron




Juniper Business Use Only
From: Ron Bonica
Sent: Monday, October 14, 2019 2:36 PM
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: draft-ietf-spring-srv6-network-programming :Section 4.16.2

Authors,

The USP flavor of the END, END.X and END.T functions isn't needed.

USP is the default IPv6 behavior. So, if the source node specifies SID[0] a=
s an RFC 4291 address on the SR egress node, you get the USP behavior for f=
ree.

                                                           Ron



Juniper Business Use Only

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<p class=3D"MsoNormal">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">You haven&#8217;t answered my question. <o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Why specify a USD flavor of END, END.X and END.T whe=
n you can get the exact same behavior by populating SID[0] with an IPv6 add=
ress that identifies a real interface?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">USD seems redundant.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;pcamaril=
@cisco.com&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 12:45 PM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;; SPRING WG List &lt;sprin=
g@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Ron,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">The USD flavour is used in any =
T.Encaps policy applied within the SR domain.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Cheers,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span lang=3D"ES" styl=
e=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Ron Bonica &lt;<a href=3D"mailto:rbonica=3D40juniper.net@d=
marc.ietf.org">rbonica=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Tuesday, 15 October 2019 at 01:03<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Subject: </b>Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">Authors=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">Sorry, =
I meant to say USD, not USP.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span lang=3D"ES">From=
:</span></b><span lang=3D"ES"> Ron Bonica
<br>
<b>Sent:</b> Monday, October 14, 2019 2:36 PM<br>
<b>To:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Subject:</b> draft-ietf-spring-srv6-network-programming :Section 4.16.2<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">Authors=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">The USP=
 flavor of the END, END.X and END.T functions isn&#8217;t needed.<o:p></o:p=
></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">USP is =
the default IPv6 behavior. So, if the source node specifies SID[0] as an RF=
C 4291 address on the SR egress node, you get the USP behavior for free.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
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From: Ron Bonica <rbonica@juniper.net>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
Thread-Index: AQHVg3fbuh9bMDe0v0OjhQe4XqXo56dcY7Ew
Date: Wed, 16 Oct 2019 00:42:47 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/B8-LDrz3wDTrc1JiC7MKvCNNskE>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Pablo,

I have read all three of these responses, but remain unconvinced.

The PSP and USP flavors both remove an SRH when the value of Segments Left =
is equal to 0. They do not remove the IP header that is extended by the SRH=
.

The SRH that is removed is functionally an NOOP, because Segments Left is e=
qual to 0. So why bother to remove it?

                                                                           =
                 Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
Sent: Tuesday, October 15, 2019 12:45 PM
To: Ron Bonica <rbonica@juniper.net>; SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4=
.16

Ron,

You have already asked that same question a few days ago with the same word=
s:
https://mailarchive.ietf.org/arch/msg/spring/4_Slu3kkHwduZZPFJJmRUkmoTVo<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/4_Slu=
3kkHwduZZPFJJmRUkmoTVo__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JD=
fQlJsrpWnQL9RJs3uNXDRTozcu0$>

and there have been replies to it detailing the use-cases:
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0Zpj=
VLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JD=
fQlJsrpWnQL9RJs3uNXDShyO5lJ$>
https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzR=
ZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JD=
fQlJsrpWnQL9RJs3uNXDeiyat5Q$>
https://mailarchive.ietf.org/arch/msg/spring/O7Bf7-UqDj4wDu76d3viV7pCSks<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/O7Bf7=
-UqDj4wDu76d3viV7pCSks__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JD=
fQlJsrpWnQL9RJs3uNXDWG9L5Tl$>

I guess you might have missed them. Please read the replies.

Thanks,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Ron Bonica <rbonica=3D40juniper.net@dmarc.ietf.org<mailto:rbonica=
=3D40juniper.net@dmarc.ietf.org>>
Date: Monday, 14 October 2019 at 20:45
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16

Authors,

Lacking the B.INSERT and T.INSERT functions, can you describe a use-case fo=
r the PSP and USP flavors of the END, END.X and END.T functions?

                                              Ron



Juniper Business Use Only

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<p class=3D"MsoNormal">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I have read all three of these responses, but remain=
 unconvinced.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The PSP and USP flavors both remove an SRH when the =
value of Segments Left is equal to 0. They do not remove the IP header that=
 is extended by the SRH.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The SRH that is removed is functionally an NOOP, bec=
ause Segments Left is equal to 0. So why bother to remove it?<o:p></o:p></p=
>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;pcamaril=
@cisco.com&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 12:45 PM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;; SPRING WG List &lt;sprin=
g@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming: Se=
ction 4.16<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:black">Ron,<o:p></o:p></span></=
p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">You have already asked that same question a few=
 days ago with the same words:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span lang=3D"ES" style=3D"color:black"><a href=3D"https://urldefense.com/v=
3/__https:/mailarchive.ietf.org/arch/msg/spring/4_Slu3kkHwduZZPFJJmRUkmoTVo=
__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDRT=
ozcu0$" title=3D"https://mailarchive.ietf.org/arch/msg/spring/4_Slu3kkHwduZ=
ZPFJJmRUkmoTVo"><span lang=3D"EN-US" style=3D"color:#954F72">https://mailar=
chive.ietf.org/arch/msg/spring/4_Slu3kkHwduZZPFJJmRUkmoTVo</span></a></span=
><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">and there have been replies to it detailing the=
 use-cases:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span lang=3D"ES" style=3D"color:black"><a href=3D"https://urldefense.com/v=
3/__https:/mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c=
__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDSh=
yO5lJ$" title=3D"https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHa=
BwecXFxqJjlg_c"><span lang=3D"EN-US" style=3D"color:#954F72">https://mailar=
chive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c</span></a></span=
><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span lang=3D"ES" style=3D"color:black"><a href=3D"https://urldefense.com/v=
3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak=
__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDei=
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YaYMCQVcTWrfak"><span lang=3D"EN-US" style=3D"color:#954F72">https://mailar=
chive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span=
><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span lang=3D"ES" style=3D"color:black"><a href=3D"https://urldefense.com/v=
3/__https:/mailarchive.ietf.org/arch/msg/spring/O7Bf7-UqDj4wDu76d3viV7pCSks=
__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDWG=
9L5Tl$" title=3D"https://mailarchive.ietf.org/arch/msg/spring/O7Bf7-UqDj4wD=
u76d3viV7pCSks"><span lang=3D"EN-US" style=3D"color:#954F72">https://mailar=
chive.ietf.org/arch/msg/spring/O7Bf7-UqDj4wDu76d3viV7pCSks</span></a></span=
><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">I guess you might have missed them. Please read=
 the replies.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"caret-color: rgb(0, 0, 0);font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">Pablo.</span><span lang=3D"ES" style=3D"color:b=
lack"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span lang=3D"ES" styl=
e=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Ron Bonica &lt;<a href=3D"mailto:rbonica=3D40juniper.net@d=
marc.ietf.org">rbonica=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Monday, 14 October 2019 at 20:45<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Subject: </b>[spring] draft-ietf-spring-srv6-network-programming: Sectio=
n 4.16<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">Authors=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">Lacking=
 the B.INSERT and T.INSERT functions, can you describe a use-case for the P=
SP and USP flavors of the END, END.X and END.T functions?<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
</div>
</body>
</html>

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From: Tianran Zhou <zhoutianran@huawei.com>
To: Susan Hares <shares@ndzh.com>, 'idr wg' <idr@ietf.org>, 'SPRING WG List' <spring@ietf.org>
Thread-Topic: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Date: Wed, 16 Oct 2019 01:20:30 +0000
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Subject: Re: [spring] [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Hi There,

I've read these two documents and support the wg adoption on both.
I think the idea is straight forward and useful. The text is easy to unders=
tand.
Here are some editorial nits are:
1. in abstract: unidirctional -> unidirectional
2. in introduction: carriying -> carrying
3. in section 3: idendifying -> identifying
4. in section 4: Bidirectioanl -> Bidirectional
5. in section 5: beyong -> beyond; receiption -> reception

And it's better to give some initial security considerations in this draft.

Cheers,
Tianran

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, October 15, 2019 2:13 AM
To: 'idr wg' <idr@ietf.org>; 'SPRING WG List' <spring@ietf.org>
Subject: Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.=
txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to=
 10/21/2019]

Greetings IDR and Spring WG

The WG Adoption for the two IDR drafts related to IDR received a level supp=
ort below the threshold to accept this draft into the IDR WG.  There were n=
o objection, but there was simply a low level of response.

This 1 week extension to the Adoption call is to let the members of both th=
e IDR and SPRING WG comment on whether these drafts have matured enough to =
be IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination =
of whether either of these two drafts have enough support to be accepted.

Thank you,  Susan  Hares
IDR co-chair

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt =
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

This begins a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019=
]

*        draft-li-bgp-ls-sr-policy-path-segment-03.txt and

*        draft-li-idr-sr-policy-path-segment-01.txt.

You can access these two drafts at the following location:

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment=
/

https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/

The authors have pointed out that the adoption of this
draft since the following  SR-MPLS Path Segment draft has been adopted:

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00

Please consider the following questions in your responses?


1)      Should this SR Policy technology be included in BGP for SR-MPLS



Spring has adopted the draft, but IDR can provide feedback

to spring about putting this technology in BGP.


2)      Is this technology a good way to implement the required

Features in BGP?



3)      Is this technology ready for adoption?



4)      Do you have any concerns about adopting this technology?



Cheers, Susan Hares

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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">Hi There,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">I</span><span lang=3D"EN-US" style=3D"font-si=
ze:10.5pt;color:#1F497D">&#8217;</span><span lang=3D"EN-US" style=3D"font-s=
ize:10.5pt;font-family:NSimSun;color:#1F497D">ve read
 these two documents and support the wg adoption on both.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">I think the idea is straight forward and usef=
ul. The text is easy to understand.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">Here are some editorial nits are:<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">1. in abstract: unidirctional -&gt; unidirect=
ional<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">2. in introduction: carriying -&gt;</span><sp=
an lang=3D"EN-US">
</span><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:NSimSun;c=
olor:#1F497D">carrying<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">3. in section 3: idendifying -&gt;</span><spa=
n lang=3D"EN-US">
</span><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:NSimSun;c=
olor:#1F497D">identifying<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">4. in section 4: Bidirectioanl -&gt; Bidirect=
ional<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">5. in section 5: beyong -&gt; beyond; receipt=
ion -&gt; reception<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">And it</span><span lang=3D"EN-US" style=3D"fo=
nt-size:10.5pt;color:#1F497D">&#8217;</span><span lang=3D"EN-US" style=3D"f=
ont-size:10.5pt;font-family:NSimSun;color:#1F497D">s
 better to give some initial security considerations in this draft.<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D">Tianran<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:NSimSun;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Idr [mailto:idr-bounces@ietf.org]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, October 15, 2019 2:13 AM<br>
<b>To:</b> 'idr wg' &lt;idr@ietf.org&gt;; 'SPRING WG List' &lt;spring@ietf.=
org&gt;<br>
<b>Subject:</b> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segm=
ent-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [1=
0/14 to 10/21/2019]<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Greetin=
gs IDR and Spring WG<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">The WG =
Adoption for the two IDR drafts related to IDR received a level support bel=
ow the threshold to accept this draft into the IDR WG.&nbsp; There were no =
objection, but there was simply a low level
 of response. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">This 1 =
week extension to the Adoption call is to let the members of both the IDR a=
nd SPRING WG comment on whether these drafts have matured enough to be IDR =
WG drafts. &nbsp;On 10/21/2019, the IDR chairs
 will make a determination of whether either of these two drafts have enoug=
h support to be accepted.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thank y=
ou,&nbsp; Susan&nbsp; Hares<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">IDR co-=
chair <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif"> Id=
r [<a href=3D"mailto:idr-bounces@ietf.org">mailto:idr-bounces@ietf.org</a>]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, September 17, 2019 12:35 PM<br>
<b>To:</b> 'idr wg'<br>
<b>Subject:</b> [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-=
03.txt and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This begins a 2 week WG Adoptio=
n call two related drafts [9/17 to 10/1/2019]
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.25pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">draft-li-bgp-ls-sr-poli=
cy-path-segment-03.txt and
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.25pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">draft-li-idr-sr-policy-=
path-segment-01.txt.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You can access these two drafts=
 at the following location:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/">https://datatrack=
er.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/</a><o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-sr-policy-path-segment/">https://datatracker.ietf=
.org/doc/draft-li-idr-sr-policy-path-segment/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The authors have pointed out th=
at the adoption of this
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">draft since the following &nbsp=
;SR-MPLS Path Segment draft has been adopted:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://tools.ietf.o=
rg/html/draft-ietf-spring-mpls-path-segment-00">https://tools.ietf.org/html=
/draft-ietf-spring-mpls-path-segment-00</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please consider the following q=
uestions in your responses?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">1)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Should this SR Policy t=
echnology be included in BGP for SR-MPLS
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Spring has adopted the d=
raft, but IDR can provide feedback
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">to spring about putting =
this technology in BGP.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">2)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Is this technology a go=
od way to implement the required
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Features in BGP? <o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">3)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Is this technology read=
y for adoption?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">4)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Do you have any concern=
s about adopting this technology?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cheers, Susan Hares <o:p></o:p>=
</span></p>
</div>
</div>
</body>
</html>

--_000_BBA82579FD347748BEADC4C445EA0F21BF0386ADNKGEML515MBXchi_--


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From: Ron Bonica <rbonica@juniper.net>
To: SPRING WG List <spring@ietf.org>, 6man <6man@ietf.org>
Thread-Topic: New Version Notification for draft-bonica-spring-srv6-plus-06.txt
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Subject: [spring] 5.2. T.Encaps: Transit with encapsulation in an SRv6 Policy
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here S1 must be End SID only, It cannot be End.X ?
since forward along the shortest path to S1.

5.2.  T.Encaps: Transit with encapsulation in an SRv6 Policy


1.   push an IPv6 header with its own SRH (S3, S2, S1; SL=3D2)
2.   set outer IPv6 SA =3D T and outer IPv6 DA =3D S1
3.   set outer payload length, traffic class and flow label    ;; Ref1,2
4.   update the Next-Header value                              ;; Ref1
5.   decrement inner Hop Limit or TTL                          ;; Ref1
6.   forward along the shortest path to S1


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<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre>here S1 must be End SID only, It cannot be <b><span style=3D"color:red=
">End.X </span></b>?<o:p></o:p></pre>
<p class=3D"MsoNormal">since <b><span style=3D"color:red">forward along the=
 shortest path to S1.</span></b><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">5.2.&nbsp; T.Encaps: Transit with encapsulation in a=
n SRv6 Policy<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">1.&nbsp;&nbsp; push an IPv6 header with its own SRH =
(S3, S2, S1; SL=3D2)<o:p></o:p></p>
<p class=3D"MsoNormal">2.&nbsp;&nbsp; set outer IPv6 SA =3D T and outer IPv=
6 DA =3D S1<o:p></o:p></p>
<p class=3D"MsoNormal">3.&nbsp;&nbsp; set outer payload length, traffic cla=
ss and flow label&nbsp;&nbsp;&nbsp; ;; Ref1,2<o:p></o:p></p>
<p class=3D"MsoNormal">4.&nbsp;&nbsp; update the Next-Header value&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ;; Ref1<o:p></o:p></p>
<p class=3D"MsoNormal">5.&nbsp;&nbsp; decrement inner Hop Limit or TTL&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ;; R=
ef1<o:p></o:p></p>
<p class=3D"MsoNormal">6.&nbsp;&nbsp; <b><span style=3D"color:red">forward =
along the shortest path to S1</span></b><o:p></o:p></p>
<br>
<p class=3D"msipfooter30b3d538" align=3D"Center" style=3D"margin:0"><span s=
tyle=3D"font-size:7.0pt;font-family:Calibri;color:#000000">Juniper Business=
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Date: Wed, 16 Oct 2019 11:37:20 +0200
From: Ondrej Zajicek <santiago@crfreenet.org>
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Subject: Re: [spring] [Idr] I-D Action: draft-ietf-idr-performance-routing-02.txt
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Hi

My main objection to the draft is it uses separate SAFI to signal that
latency based routing is used. I don't think that is a good idea. Latency
based routing is a general concept, which makes sense to use with several
existing SAFIs (at least 1, 4 and 128). Whether or not announce and
use NETWORK_LATENCY TLV should be an independent session property, like
using AIGP TLV or e.g. ADD-PATH extension.

This is an issue that was underspecified in RFC 7311, just kept by
configuration of both sides. Perhaps we need a new capability to specify
which AIGP TLVs (if any) are supposed to be used on the session, so it
can be negotiated automatically like ADD-PATH.

-- 
Ondrej 'Santiago' Zajicek (email: santiago@crfreenet.org)


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From: "UTTARO, JAMES" <ju1738@att.com>
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From: "Rishabh Parekh (riparekh)" <riparekh@cisco.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "zzhang@juniper.net" <zzhang@juniper.net>
CC: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Some questions regarding Replication SID
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Subject: Re: [spring] Some questions regarding Replication SID
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Alexander,
Responses to your queries are prefaced with [RP].


1. The draft says that "each branch is abstracted to a <Downstream Node, Do=
wnstream Replication-SID>".  Does that mean that the Downstream Replication=
-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https://=
tools.ietf.org/html/rfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you =
point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that=
 represents the Replication segment in data plane.



2. The draft also says that "A Replication branch to a particular Downstrea=
m Node could be represented by the node's Node SID".  Does this mean that t=
he Replication Node sends the packets it receives with the Replication SID =
as the active segment with the labels representing the downstream Node SID =
as the active segment across such a replication branch?

[RP] No, Replication SID relevant at a downstream node would be the bottom =
label with other SIDs stacked on top which would guide the packet to the do=
wnstream node. Of course, if the Downstream node is adjacent to the Replica=
tion node, only the Replication SID would be present in the outgoing packet=
.



3. The draft also says that "Replication segment is instantiated at Downstr=
eam nodes and at the Replication node".  Does that mean that the list of SI=
Ds associated with the specific replication Branch is pushed by the Replica=
tion Node on top of the label representing the Replication SID in the Downs=
tream node of this branch?

[RP] Yes. See response to 2 above.



4. Are the labels that represent the Replication SID at the Downstream node=
s downstream-allocated by these nodes or upstream-allocated by the replicat=
ion node?

[RP] Since the Replication SID is locally relevant at a node, the Replicati=
on SID would be downstream-allocated. However, it may also be allocated by =
PCE; see response to 5, 6 below.



5. The draft also says that  "A Replication segment can be either provision=
ed locally on a node or programmed by a PCE". These two options look exactl=
y the same to me from the POV of the node on which the Replication segment =
is programmed - what, if anything, did I miss?

[RP] You are right in that it does not matter how Replication segment is in=
stantiated at a node. The use of PCE is relevant for SR P2MP Policy<https:/=
/datatracker.ietf.org/doc/draft-voyer-pim-sr-p2mp-policy/> draft where PCE =
instantiates Replication segments.



6. Did you consider a possibility of advertising the Replication Segment fr=
om the Downstream nodes to the Replication one using some multicast routing=
 protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a pos=
sibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of S=
R is to simplify. The idea is same here - use replication segments to reali=
ze P2MP trees computed by PCE (without need of multicast protocols) as spec=
ified in SR P2MP draft



Any details regarding instantiation of the Replication Segment in SR-MPLS w=
ould be highly appreciated.

[RP]SR P2MP policy draft lists different protocols (PCEP, BGP, etc.) that c=
an be used to instantiate Replication segments. SR P2MP PCEP<https://tools.=
ietf.org/html/draft-dhs-spring-pce-sr-p2mp-policy-00> would be updated; oth=
er drafts will be published in future.


More of the same...
Pleade note that if the anser to #3 in my original message is positive, the=
n the statement in the draft that say the Replication Segment is similar to=
 the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the R=
eplication segment at Root (or Headend) node can be used as a (constant) Bi=
nding SID to steer traffic into the segment.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Sent: Tuesday, October 15, 2019 6:31 AM
To: daniel.voyer@bell.ca; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com>=
; Rishabh Parekh (riparekh) <riparekh@cisco.com>; hooman.bidgoli@nokia.com;=
 zzhang@juniper.net
Cc: spring@ietf.org
Subject: Some questions regarding Replication SID

Dear colleagues,
I have read the Replication SID draft<https://tools.ietf.org/html/draft-voy=
er-spring-sr-replication-segment-00>, and I have a few questions dealing wi=
th possible instantiation of the Replication SOD in SR-MPLS<https://tools.i=
etf.org/html/draft-ietf-spring-segment-routing-mpls-22>.


1. The draft says that "each branch is abstracted to a <Downstream Node, Do=
wnstream Replication-SID>".  Does that mean that the Downstream Replication=
-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https://=
tools.ietf.org/html/rfc8402>?

2. The draft also says that "A Replication branch to a particular Downstrea=
m Node could be represented by the node's Node SID".  Does this mean that t=
he Replication Node sends the packets it receives with the Replication SID =
as the active segment with the labels representing the downstream Node SID =
as the active segment across such a replication branch?

3. The draft also says that "Replication segment is instantiated at Downstr=
eam nodes and at the Replication node".  Does that mean that the list of SI=
Ds associated with the specific replication Branch is pushed by the Replica=
tion Node on top of the label representing the Replication SID in the Downs=
tream node of this branch?

4. Are the labels that represent the Replication SID at the Downstream node=
s downstream-allocated by these nodes or upstream-allocated by the replicat=
ion node?

5. The draft also says that  "A Replication segment can be either provision=
ed locally on a node or programmed by a PCE". These two options look exactl=
y the same to me from the POV of the node on which the Replication segment =
is programmed - what, if anything, did I miss?

6. Did you consider a possibility of advertising the Replication Segment fr=
om the Downstream nodes to the Replication one using some multicast routing=
 protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a pos=
sibility strictly precluded?



Any details regarding instantiation of the Replication Segment in SR-MPLS w=
ould be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecite=
le.com>


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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Alexa=
nder,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Respo=
nses to your queries are prefaced with [RP].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft says that &#8220;</span><span lang=3D"EN" sty=
le=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">each branch is =
abstracted to a &lt;Downstream Node, Downstream Replication-SID&gt;</span><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">=
&#8221;. &nbsp;Does that mean that the </span><span lang=3D"EN" style=3D"fo=
nt-size:12.0pt;font-family:&quot;Courier New&quot;">Downstream Replication-=
SID</span><span lang=3D"EN" style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif"> </span><span style=3D"font-size:11.0pt;font-family:=
&quot;Calibri&quot;,sans-serif">is one of the SIDs defined in Sections 3, 4=
 and 5&nbsp; of <a href=3D"https://tools.ietf.org/html/rfc8402">RFC8402</a>=
?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Replicat=
ion SID not a topological SID as defined the sections you point to in RFC 8=
402. Instead, it is a separate SID (label in SR-MPLS) that represents the R=
eplication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that</span> &#8220;<span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Replicat=
ion branch to a particular Downstream Node could be represented by the node=
's Node </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quo=
t;Times New Roman&quot;,serif">SID</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does this mean tha=
t the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node S=
ID as the active segment across such a replication branch?<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Replicat=
ion SID relevant at a downstream node would be the bottom label with other =
SIDs stacked on top which would guide the packet to the downstream node. Of=
 course, if the Downstream node is adjacent to the Replication node, only t=
he Replication SID would be present in the outgoing packet.<o:p></o:p></spa=
n></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &#8220;</span><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">Replicatio=
n segment is instantiated at Downstream nodes and at the Replication node</=
span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">&#8221;. &nbsp;Does that mean that the list of SIDs associated with t=
he specific replication Branch is pushed by the Replication Node on top of =
the label representing the Replication SID in the Downstream node of this b=
ranch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Yes. See res=
ponse to 2 above.<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l1 level1 lfo2"><![if !supportLists]><span lang=3D"EN" style=3D"f=
ont-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-lis=
t:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span>=
</span></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif">Are the labels that represent the Replication SID =
at the Downstream nodes downstream-allocated by these nodes or upstream-all=
ocated by the replication node?</span><span lang=3D"EN" style=3D"font-size:=
12.0pt;font-family:&quot;Courier New&quot;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Since the Re=
plication SID is locally relevant at a node, the Replication SID would be d=
ownstream-allocated. However, it may also be allocated by PCE; see response=
 to 5, 6 below.<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span lang=3D"EN" =
style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;"><o:p>&nbsp;<=
/o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &nbsp;&#8220;</span><span lang=
=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Re=
plication segment can be either provisioned locally on a node or programmed=
 by a PCE</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&q=
uot;,sans-serif">&#8221;. These two options look exactly the same to me fro=
m the POV of the node on which the Replication segment is programmed - what=
, if anything, did I miss?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are righ=
t in that it does not matter how Replication segment is instantiated at a n=
ode. The use of PCE is relevant for <a href=3D"https://datatracker.ietf.org=
/doc/draft-voyer-pim-sr-p2mp-policy/">SR P2MP Policy</a> draft where PCE in=
stantiates Replication segments.<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">Did you consider a possibility of advertising the Repli=
cation Segment from the Downstream nodes to the Replication one using some =
multicast routing protocol (e.g., creating a SR-MPLS replacement for mLDP)?=
 Or is such a possibility strictly precluded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do not =
strictly preclude any protocol , but one of the goals of SR is to simplify.=
 The idea is same here - use replication segments to realize P2MP trees com=
puted by PCE (without need of multicast protocols) as specified in SR P2MP =
draft<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiatio=
n of the Replication Segment in SR-MPLS would be highly appreciated.<o:p></=
o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif">[RP]SR P2MP policy draft lists dif=
ferent protocols (PCEP, BGP, etc.) that can be used to instantiate Replicat=
ion segments. <a href=3D"https://tools.ietf.org/html/draft-dhs-spring-pce-s=
r-p2mp-policy-00">SR P2MP PCEP</a> would be updated; other drafts will be p=
ublished in future.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">More of the same...<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">Pleade note that if the anser to #3 in my original message is positive=
, then the statement in the draft that say the Replication Segment is simil=
ar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">[RP] Since Replication SID is local to a Node, the Replication SID of =
the Replication segment at Root (or Headend) node can be used as a (constan=
t) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Rish=
abh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;Alexander.Vain=
shtein@ecitele.com&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 6:31 AM<br>
<b>To:</b> daniel.voyer@bell.ca; Clarence Filsfils (cfilsfil) &lt;cfilsfil@=
cisco.com&gt;; Rishabh Parekh (riparekh) &lt;riparekh@cisco.com&gt;; hooman=
.bidgoli@nokia.com; zzhang@juniper.net<br>
<b>Cc:</b> spring@ietf.org<br>
<b>Subject:</b> Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear colleagues,<o:p></o:p></p>
<p class=3D"MsoNormal">I have read the <a href=3D"https://tools.ietf.org/ht=
ml/draft-voyer-spring-sr-replication-segment-00">
Replication SID draft</a>, and I have a few questions dealing with possible=
 instantiation of the Replication SOD in
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mp=
ls-22">SR-MPLS</a>.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft says that &#8220;</span><span lang=3D"EN" sty=
le=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">each branch is =
abstracted to a &lt;Downstream Node, Downstream Replication-SID&gt;</span><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">=
&#8221;. &nbsp;Does that mean that the </span><span lang=3D"EN" style=3D"fo=
nt-size:12.0pt;font-family:&quot;Courier New&quot;">Downstream Replication-=
SID</span><span lang=3D"EN" style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif"> </span><span style=3D"font-size:11.0pt;font-family:=
&quot;Calibri&quot;,sans-serif">is one of the SIDs defined in Sections 3, 4=
 and 5&nbsp; of </span><a href=3D"https://tools.ietf.org/html/rfc8402"><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">RFC=
8402</span></a><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&qu=
ot;,sans-serif">? <o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that</span> &#8220;<span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Replicat=
ion branch to a particular Downstream Node could be represented by the node=
's Node </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quo=
t;Times New Roman&quot;,serif">SID</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does this mean tha=
t the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node S=
ID as the active segment across such a replication branch?<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &#8220;</span><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">Replicatio=
n segment is instantiated at Downstream nodes and at the Replication node</=
span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">&#8221;. &nbsp;Does that mean that the list of SIDs associated with t=
he specific replication Branch is pushed by the Replication Node on top of =
the label representing the Replication SID in the Downstream node of this b=
ranch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo4"><![if !supportLists]><span lang=3D"EN" style=3D"f=
ont-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-lis=
t:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span>=
</span></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif">Are the labels that represent the Replication SID =
at the Downstream nodes downstream-allocated by these nodes or upstream-all=
ocated by the replication node? </span><span lang=3D"EN" style=3D"font-size=
:12.0pt;font-family:&quot;Courier New&quot;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &nbsp;&#8220;</span><span lang=
=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Re=
plication segment can be either provisioned locally on a node or programmed=
 by a PCE</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&q=
uot;,sans-serif">&#8221;. These two options look exactly the same to me fro=
m the POV of the node on which the Replication segment is programmed - what=
, if anything, did I miss?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">Did you consider a possibility of advertising the Repli=
cation Segment from the Downstream nodes to the Replication one using some =
multicast routing protocol (e.g., creating a SR-MPLS replacement for mLDP)?=
 Or is such a possibility strictly precluded?<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiatio=
n of the Replication Segment in SR-MPLS would be highly appreciated.<o:p></=
o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-5492663=
02<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vains=
htein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><br>
___________________________________________________________________________=
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This e-mail message is intended for the recipient only and contains informa=
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From: li zhenqiang <li_zhenqiang@hotmail.com>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>
CC: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
Thread-Topic: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Date: Thu, 17 Oct 2019 04:11:00 +0000
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>
CC: "spring@ietf.org" <spring@ietf.org>, "Rishabh Parekh (riparekh)" <riparekh@cisco.com>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "zzhang@juniper.net" <zzhang@juniper.net>
Thread-Topic: Some questions regarding Replication SID
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Subject: Re: [spring] Some questions regarding Replication SID
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Rishabh,
Lots of thanks for a prompt and detailed response.

Please see more inline below.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: Rishabh Parekh (riparekh) <riparekh@cisco.com>
Sent: Thursday, October 17, 2019 1:24 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>; daniel.voyer@=
bell.ca; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com>; hooman.bidgoli=
@nokia.com; zzhang@juniper.net
Cc: spring@ietf.org
Subject: RE: Some questions regarding Replication SID

Alexander,
Responses to your queries are prefaced with [RP].


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you=
 point to in=20RFC 8402. Instead, it is a separate SID (label in SR-MPLS) =
that represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actua=
lly I wanted to ask whether the SIDs in the list that represent a specific=
 Replication Branch are the SIDs defined in RFC 8204. The text I see in th=
e SR P2MP Policy<https://tools.ietf.org/html/draft-voyer-pim-sr-p2mp-polic=
y-00> draft seems to suggest that it is not necessarily so  because a Tree=
-SID is considered also as the Replication SID. This looks inconsistent to=
 me because a Replication SID as defined in this draft is instantiated bot=
h in the Replication node and in the Downstream nodes while the Tree-SID d=
oes not require instantiation in the Leaf nodes (this is optional).



2. The draft also says that "A Replication branch to a particular Downstre=
am Node could be represented by the node's Node SID".  Does this mean that=
 the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node =
SID as the active segment across such a replication branch?

[RP] No, Replication SID relevant at a downstream node would be the bottom=
 label with other SIDs stacked on top which would guide the packet to the =
downstream node. Of course, if the Downstream node is adjacent to the Repl=
ication node, only the Replication SID would be present in the outgoing pa=
cket.[[Sasha]] OK, thanks.



3. The draft also says that "Replication segment is instantiated at Downst=
ream nodes and at the Replication node".  Does that mean that the list of =
SIDs associated with the specific replication Branch is pushed by the Repl=
ication Node on top of the label representing the Replication SID in the D=
ownstream node of this branch?

[RP] Yes. See response to 2 above.[[Sasha]] OK, thanks again.



4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

[RP] Since the Replication SID=20is locally relevant at a node, the Replic=
ation SID would be downstream-allocated. However, it may also be allocated=
 by PCE; see response to 5, 6 below.[[Sasha]] OK, thanks.



5. The draft also says that  "A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE". These two options look exac=
tly the same to me from the POV of the node on which the Replication segme=
nt is programmed - what, if anything, did I miss?

[RP] You are right in that it does not matter how Replication segment is i=
nstantiated at a node. The use of PCE is relevant for SR P2MP Policy<https=
://clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PC=
E instantiates Replication segments.[[Sasha]] OK, I will  look up the seco=
nd draft. BTW, it does not appear as a reference in this one - is it inten=
tional?



6. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of =
SR is to simplify. The idea is same here - use replication segments to rea=
lize P2MP trees computed by PCE (without need of multicast protocols) as s=
pecified in SR P2MP draft[[Sasha]] One of the well-known aspects that make=
 multicast different is that the traffic in the Service Provider domain is=
 driven by the dynamic customer requests. Handling these requests via a PC=
E looks problematic to me.



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be highly appreciated.

[RP]SR P2MP policy draft lists different protocols (PCEP, BGP, etc.) that =
can be used to instantiate Replication segments. SR P2MP PCEP<https://clic=
ktime.symantec.com/3JuFtE8qkd9Viz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf=
.org%2Fhtml%2Fdraft-dhs-spring-pce-sr-p2mp-policy-00> would be updated; ot=
her drafts will be published in future.


More of the same...
Pleade note that if the anser to #3 in my original message is positive, th=
en the statement in the draft that say the Replication Segment is similar =
to the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the =
Replication segment at Root (or Headend) node can be used as a (constant) =
Binding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and th=
e Replication SID as defined here is that the former is instantiated just =
locally while the Replication SID is instantiated both in the Replication =
node and in the Downstream nodes.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Tuesday, October 15, 2019 6:31 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>; Clarence Filsfils (=
cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; Rishabh Parekh =
(riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.com>>; hooman.bidgoli=
@nokia.com<mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzh=
ang@juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: Some questions regarding Replication SID

Dear colleagues,
I have read the Replication SID draft<https://clicktime.symantec.com/3G11J=
yktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voye=
r-spring-sr-replication-segment-00>, and I have a few questions dealing wi=
th possible instantiation of the Replication SOD in SR-MPLS<https://clickt=
ime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dhttps%3A%2F%2Ftools.ietf.o=
rg%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpls-22>.


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

2. The draft also says that "A Replication branch to a particular Downstre=
am Node could be represented by the node's Node SID".  Does this mean that=
 the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node =
SID as the active segment across such a replication branch?

3. The draft also says that "Replication segment is instantiated at Downst=
ream nodes and at the Replication node".  Does that mean that the list of =
SIDs associated with the specific replication Branch is pushed by the Repl=
ication Node on top of the label representing the Replication SID in the D=
ownstream node of this branch?

4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

5. The draft also says that  "A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE". These two options look exac=
tly the same to me from the POV of the node on which the Replication segme=
nt is programmed - what, if anything, did I miss?

6. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a =
prompt and detailed response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please see more </spa=
n><b><i><span style=3D"color:#00B0F0">inline below</span></i></b><span sty=
le=3D"color:#1F497D">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; Al=
exander.Vainshtein@ecitele.com<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;riparekh=
@cisco.com&gt; <br>
<b>Sent:</b> Thursday, October 17, 2019 1:24 AM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;; =
daniel.voyer@bell.ca; Clarence Filsfils (cfilsfil) &lt;cfilsfil@cisco.com&=
gt;; hooman.bidgoli@nokia.com; zzhang@juniper.net<br>
<b>Cc:</b> spring@ietf.org<br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Resp=
onses to your queries are prefaced with [RP].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that &#=
8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;=
Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, Dow=
nstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that the=
 </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Cour=
ier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of <a href=3D"https:=
//clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftool=
s.ietf.org%2Fhtml%2Frfc8402">RFC8402</a>?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID not a topological SID as defined the sections you point to in =
RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that represents=
 the Replication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </=
span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the =
process of writing. Actually I wanted to ask whether the SIDs in the list =
that represent a specific Replication Branch are the SIDs defined in RFC 8=
204. The text I see in the </span></i></b><b><i><span style=3D"font-size:1=
1.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><a href=3D=
"https://tools.ietf.org/html/draft-voyer-pim-sr-p2mp-policy-00">SR P2MP Po=
licy</a> </span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:=
&quot;Calibri&quot;,sans-serif;color:#00B0F0">draft seems to suggest that =
it is not necessarily so &nbsp;because a Tree-SID is considered also as th=
e Replication SID. This looks inconsistent to me because a Replication SID=
 as defined in this draft is instantiated both in the Replication node and=
 in the Downstream nodes while the Tree-SID does not require instantiation=
 in the Leaf nodes (this is optional). </span></i></b><span style=3D"font-=
size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p=
></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at</span> &#8220;<span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">A Replication branch to a particular Downstream No=
de could be represented by the node's Node </span><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">SID</span=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f">&#8221;. &nbsp;Does this mean that the Replication Node sends the packe=
ts it receives with the Replication SID as the active segment with the lab=
els representing the downstream Node SID as the active segment across such=
 a replication branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID relevant at a downstream node would be the bottom label with o=
ther SIDs stacked on top which would guide the packet to the downstream no=
de. Of course, if the Downstream node is adjacent to the Replication node,=
 only the Replication SID would be present in the outgoing packet<span sty=
le=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, thanks</i></b></span><b><i><span=
 style=3D"color:#1F497D">. </span></i></b><span style=3D"color:#1F497D">&n=
bsp;</span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">Replication segment is instantiated at Downstream =
nodes and at the Replication node</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean th=
at the list of SIDs associated with the specific replication Branch is pus=
hed by the Replication Node on top of the label representing the Replicati=
on SID in the Downstream node of this branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Yes. See=
 response to 2 above<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, tha=
nks again.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-=
list:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </s=
pan></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Are the labels that=
 represent the Replication SID at the Downstream nodes downstream-allocate=
d by these nodes or upstream-allocated by the replication node?</span><spa=
n lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot=
;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Since th=
e Replication SID is locally relevant at a node, the Replication SID would=
 be downstream-allocated. However, it may also be allocated by PCE; see re=
sponse to 5, 6 below<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, tha=
nks.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span lang=3D"E=
N" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;"><o:p>&nb=
sp;</o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &nbsp;&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-fa=
mily:&quot;Courier New&quot;">A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE</span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">&#8221;. These two op=
tions look exactly the same to me from the POV of the node on which the Re=
plication segment is programmed - what, if anything, did I miss?<o:p></o:p=
></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are =
right in that it does not matter how Replication=20segment is instantiated=
 at a node. The use of PCE is relevant for <a href=3D"https://clicktime.sy=
mantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.or=
g%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F">SR P2MP Policy</a> draft wher=
e PCE instantiates Replication segments<span style=3D"color:#00B0F0">.<b><=
i>[[Sasha]] OK, I will &nbsp;look up the second draft. BTW, it does not ap=
pear as a reference in this one &#8211; is it intentional?</i></b> <o:p></=
o:p></span></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do =
not strictly preclude any protocol , but one of the goals of SR is to simp=
lify. The idea is same here - use replication segments to realize P2MP tre=
es computed by PCE (without need of multicast protocols) as specified in S=
R P2MP draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-=
known aspects that make multicast different is that the traffic in the Ser=
vice Provider domain is driven by the dynamic customer requests. Handling =
these requests via a PCE looks problematic to me. </span></i></b><span sty=
le=3D"color:#00B0F0"><o:p></o:p></span></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiat=
ion of the Replication Segment in SR-MPLS would be highly appreciated.<o:p=
></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">[RP]SR P2MP policy draft lists d=
ifferent protocols (PCEP, BGP, etc.) that can be used to instantiate Repli=
cation segments. <a href=3D"https://clicktime.symantec.com/3JuFtE8qkd9Viz4=
Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-dhs-spring-pce=
-sr-p2mp-policy-00">SR P2MP PCEP</a> would be updated; other drafts will b=
e published in future.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">More of the same...<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">Pleade note that if the anser to #3 in my original message is positi=
ve, then the statement in the draft that say the Replication Segment is si=
milar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">[RP] Since Replication SID is local to a Node, the Replication SID o=
f the Replication segment at Root (or Headend) node can be used as a (cons=
tant) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"col=
or:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in=
 8204 and the Replication SID as defined here is that the former is instan=
tiated just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream no=
des.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Ris=
habh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 6:31 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a=
>; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">=
cfilsfil@cisco.com</a>&gt;; Rishabh Parekh (riparekh) &lt;<a href=3D"mailt=
o:riparekh@cisco.com">riparekh@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear colleagues,<o:p></o:p></p>
<p class=3D"MsoNormal">I have read the <a href=3D"https://clicktime.symant=
ec.com/3G11JyktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%=
2Fdraft-voyer-spring-sr-replication-segment-00">
Replication SID draft</a>, and I have a few questions dealing with possibl=
e instantiation of the Replication SOD in
<a href=3D"https://clicktime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dh=
ttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpl=
s-22">
SR-MPLS</a>.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span=20style=3D"mso-l=
ist:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </sp=
an></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that =
&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quo=
t;Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, D=
ownstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that t=
he </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Co=
urier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of </span><a href=3D=
"https://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F=
%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">RFC8402</span></a><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">? <o:p></o:p></s=
pan></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at</span> &#8220;<span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">A Replication branch to a particular Downstream No=
de could be represented by the node's Node </span><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">SID</span=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f">&#8221;. &nbsp;Does this mean that the Replication Node sends the packe=
ts it receives with the Replication SID as the active segment with the lab=
els representing the downstream Node SID as the active segment across such=
 a replication branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">Replication segment is instantiated at Downstream =
nodes and at the Replication node</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean th=
at the list of SIDs associated with the specific replication Branch is pus=
hed by the Replication Node on=20top of the label representing the Replica=
tion SID in the Downstream node of this branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-=
list:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </s=
pan></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Are the labels that=
 represent the Replication SID at the Downstream nodes downstream-allocate=
d by these nodes or upstream-allocated by the replication node? </span><sp=
an lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quo=
t;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &nbsp;&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-fa=
mily:&quot;Courier New&quot;">A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE</span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">&#8221;. These two op=
tions look exactly the same to me from the POV of the node on which the Re=
plication segment is programmed - what, if anything, did I miss?<o:p></o:p=
></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiat=
ion of the Replication Segment in SR-MPLS would be highly appreciated.<o:p=
></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><br>
__________________________________________________________________________=
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Rishabh Parekh (riparekh)" <riparekh@cisco.com>
CC: "spring@ietf.org" <spring@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "zzhang@juniper.net" <zzhang@juniper.net>, "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>
Thread-Topic: Some questions regarding Replication SID
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Date: Thu, 17 Oct 2019 05:25:34 +0000
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Subject: Re: [spring] Some questions regarding Replication SID
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Re-sending with corrected To and CC lists...

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: Alexander Vainshtein
Sent: Thursday, October 17, 2019 8:25 AM
To: daniel.voyer@bell.ca
Cc: spring@ietf.org; Rishabh Parekh (riparekh) <riparekh@cisco.com>; Clare=
nce Filsfils (cfilsfil) <cfilsfil@cisco.com>; hooman.bidgoli@nokia.com; zz=
hang@juniper.net
Subject: RE: Some questions regarding Replication SID

Rishabh,
Lots of thanks for a prompt and detailed response.

Please see more inline below.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>

From: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.=
com>>
Sent: Thursday, October 17, 2019 1:24 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexande=
r.Vainshtein@ecitele.com>>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.=
ca>; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisc=
o.com>>; hooman.bidgoli@nokia.com<mailto:hooman.bidgoli@nokia.com>; zzhang=
@juniper.net<mailto:zzhang@juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: RE: Some questions regarding Replication SID

Alexander,
Responses to your queries are prefaced with [RP].


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you=
 point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) th=
at represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actua=
lly I wanted to ask whether the SIDs in the list that represent a specific=
 Replication Branch are the SIDs defined in RFC 8204. The text I see in th=
e SR P2MP Policy<https://tools.ietf.org/html/draft-voyer-pim-sr-p2mp-polic=
y-00> draft seems to suggest that it is not necessarily so  because a Tree=
-SID is considered also as the Replication SID. This looks inconsistent to=
 me because a Replication SID as defined in this draft is instantiated bot=
h in the Replication node and in the Downstream nodes while the Tree-SID d=
oes not require instantiation in the Leaf nodes (this is optional).



2. The draft also says that "A Replication branch to a particular Downstre=
am Node could be represented by the node's Node SID".  Does this mean that=
 the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node =
SID as the active segment across such a replication branch?

[RP] No, Replication SID relevant at a downstream node would be the bottom=
 label with other SIDs stacked on top which would guide the packet to the =
downstream node. Of course, if the Downstream node is adjacent to the Repl=
ication node, only the Replication SID would be present in the outgoing pa=
cket.[[Sasha]] OK, thanks.



3. The draft also says that "Replication segment is instantiated at Downst=
ream nodes and at the Replication node".  Does that mean that the list of =
SIDs associated with the specific replication Branch is pushed by the Repl=
ication Node on top of the label representing the Replication SID in the D=
ownstream node of this branch?

[RP] Yes. See response to 2 above.[[Sasha]] OK, thanks again.



4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

[RP] Since the Replication SID is locally relevant at a node, the Replicat=
ion SID would be downstream-allocated. However, it may also be allocated b=
y PCE; see response to 5, 6 below.[[Sasha]] OK, thanks.



5. The draft also says that  "A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE". These two options look exac=
tly the same to me from the POV of the node on which the Replication segme=
nt is programmed - what, if anything, did I miss?

[RP] You are right in that it does not matter how Replication segment is i=
nstantiated at a node. The use of PCE is relevant for SR P2MP Policy<https=
://clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PC=
E instantiates Replication segments.[[Sasha]] OK, I will  look up the seco=
nd draft. BTW, it does not appear as a reference in this one - is it inten=
tional?



6. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of =
SR is to simplify. The idea is same here - use replication segments to rea=
lize P2MP trees computed by PCE (without need of multicast protocols) as s=
pecified in SR P2MP draft[[Sasha]] One of the well-known aspects that make=
 multicast different is that the traffic in the Service Provider domain is=
 driven by the dynamic customer requests. Handling these requests via a PC=
E looks problematic to me.



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be highly appreciated.

[RP]SR P2MP policy draft lists different protocols (PCEP, BGP, etc.) that =
can be used to instantiate Replication segments. SR P2MP PCEP<https://clic=
ktime.symantec.com/3JuFtE8qkd9Viz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf=
.org%2Fhtml%2Fdraft-dhs-spring-pce-sr-p2mp-policy-00> would be updated; ot=
her drafts will be published in future.


More of the same...
Pleade note that if the anser to #3 in my original message is positive, th=
en the statement in the draft that say the Replication Segment is similar =
to the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the =
Replication segment at Root (or Headend) node can be used as a (constant) =
Binding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and th=
e Replication SID as defined here is that the former is instantiated just =
locally while the Replication SID is instantiated both in the Replication =
node and in the Downstream nodes.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Tuesday, October 15, 2019 6:31 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>; Clarence Filsfils (=
cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; Rishabh Parekh =
(riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.com>>; hooman.bidgoli=
@nokia.com<mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzh=
ang@juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: Some questions regarding Replication SID

Dear colleagues,
I have read the Replication SID draft<https://clicktime.symantec.com/3G11J=
yktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voye=
r-spring-sr-replication-segment-00>, and I have a few questions dealing wi=
th possible instantiation of the Replication SOD in SR-MPLS<https://clickt=
ime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dhttps%3A%2F%2Ftools.ietf.o=
rg%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpls-22>.


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

2. The draft also says that "A Replication branch to a particular Downstre=
am Node could be represented by the node's Node SID".  Does this mean that=
 the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node =
SID as the active segment across such=20a replication branch?

3. The draft also says that "Replication segment is instantiated at Downst=
ream nodes and at the Replication node".  Does that mean that the list of =
SIDs associated with the specific replication Branch is pushed by the Repl=
ication Node on top of the label representing the Replication SID in the D=
ownstream node of this branch?

4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

5. The draft also says that  "A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE". These two options look exac=
tly the same to me from the POV of the node on which the Replication segme=
nt is programmed - what, if anything, did I miss?

6. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>


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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Re-sending with corre=
cted To and CC lists...<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; Al=
exander.Vainshtein@ecitele.com<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein <br>
<b>Sent:</b> Thursday, October 17, 2019 8:25 AM<br>
<b>To:</b> daniel.voyer@bell.ca<br>
<b>Cc:</b> spring@ietf.org; Rishabh Parekh (riparekh) &lt;riparekh@cisco.c=
om&gt;; Clarence Filsfils (cfilsfil) &lt;cfilsfil@cisco.com&gt;; hooman.bi=
dgoli@nokia.com; zzhang@juniper.net<br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a =
prompt and detailed response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please see more </spa=
n><b><i><span style=3D"color:#00B0F0">inline below</span></i></b><span sty=
le=3D"color:#1F497D">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; <a=
 href=3D"mailto:Alexander.Vainshtein@ecitele.com">
Alexander.Vainshtein@ecitele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;<a href=3D=
"mailto:riparekh@cisco.com">riparekh@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 1:24 AM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a>; Clarence=
 Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@ci=
sco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Resp=
onses to your queries are prefaced with [RP].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that &#=
8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;=
Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, Dow=
nstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that the=
 </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Cour=
ier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of <a href=3D"https:=
//clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftool=
s.ietf.org%2Fhtml%2Frfc8402">RFC8402</a>?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID not a topological SID as defined the sections you point to in =
RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that represents=
 the Replication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </=
span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the =
process of writing. Actually I wanted to ask whether the SIDs in the list =
that represent a specific Replication Branch are the SIDs defined in RFC 8=
204. The text I see in the </span></i></b><b><i><span style=3D"font-size:1=
1.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><a href=3D=
"https://tools.ietf.org/html/draft-voyer-pim-sr-p2mp-policy-00">SR P2MP Po=
licy</a> </span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:=
&quot;Calibri&quot;,sans-serif;color:#00B0F0">draft seems to suggest that =
it is not necessarily so &nbsp;because a Tree-SID is considered also as th=
e Replication SID. This looks inconsistent to me because a Replication SID=
 as defined in this draft is instantiated both in the Replication node and=
 in the Downstream nodes while the Tree-SID does not require instantiation=
 in the Leaf nodes (this is optional). </span></i></b><span style=3D"font-=
size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p=
></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at</span> &#8220;<span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">A Replication branch to a particular Downstream No=
de could be represented by the node's Node </span><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">SID</span=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f">&#8221;. &nbsp;Does this mean that the Replication Node sends the packe=
ts it receives with the Replication SID as the active segment with the lab=
els representing the downstream Node SID as the active segment across such=
 a replication branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID relevant at a downstream node would be the bottom label with o=
ther SIDs stacked on top which would guide the packet to the downstream no=
de. Of course, if the Downstream node is adjacent to the Replication node,=
 only the Replication SID would be present in the outgoing packet<span sty=
le=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, thanks</i></b></span><b><i><span=
 style=3D"color:#1F497D">. </span></i></b><span style=3D"color:#1F497D">&n=
bsp;</span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">Replication segment is instantiated at Downstream =
nodes and at the Replication node</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean th=
at the list of SIDs associated with the specific replication Branch is pus=
hed=20by the Replication Node on top of the label representing the Replica=
tion SID in the Downstream node of this branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Yes. See=
 response to 2 above<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, tha=
nks again.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-=
list:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </s=
pan></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Are the labels that=
 represent the Replication SID at the Downstream nodes downstream-allocate=
d by these nodes or upstream-allocated by the replication node?</span><spa=
n lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot=
;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Since th=
e Replication SID is locally relevant at a node, the Replication SID would=
 be downstream-allocated. However, it may also be allocated by PCE; see re=
sponse to 5, 6 below<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, tha=
nks.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span lang=3D"E=
N" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;"><o:p>&nb=
sp;</o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &nbsp;&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-fa=
mily:&quot;Courier New&quot;">A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE</span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">&#8221;. These two op=
tions look exactly the same to me from the POV of the node on which the Re=
plication segment is programmed - what, if anything, did I miss?<o:p></o:p=
></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are =
right in that it does not matter how Replication segment is instantiated a=
t a node. The use of PCE is relevant for <a href=3D"https://clicktime.syma=
ntec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%=
2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F">SR P2MP Policy</a> draft where =
PCE instantiates Replication segments<span style=3D"color:#00B0F0">.<b><i>=
[[Sasha]] OK, I will &nbsp;look up the second draft. BTW, it does not appe=
ar as a reference in this one &#8211; is it intentional?</i></b> <o:p></o:=
p></span></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do =
not strictly preclude any protocol , but one of the goals of SR is to simp=
lify. The idea is same here - use replication segments to realize P2MP tre=
es computed by PCE (without need of multicast protocols) as specified in S=
R P2MP draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-=
known aspects that make multicast different is that the traffic in the Ser=
vice Provider domain is driven by the dynamic customer requests. Handling =
these requests via a PCE looks problematic to me. </span></i></b><span sty=
le=3D"color:#00B0F0"><o:p></o:p></span></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiat=
ion of the Replication Segment in SR-MPLS would be highly appreciated.<o:p=
></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">[RP]SR P2MP policy draft lists d=
ifferent protocols (PCEP, BGP, etc.) that can be used to instantiate Repli=
cation segments. <a href=3D"https://clicktime.symantec.com/3JuFtE8qkd9Viz4=
Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-dhs-spring-pce=
-sr-p2mp-policy-00">SR P2MP PCEP</a> would be updated; other drafts will b=
e published in future.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">More of the same...<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span=20style=3D"color:#=
212121">Pleade note that if the anser to #3 in my original message is posi=
tive, then the statement in the draft that say the Replication Segment is =
similar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">[RP] Since Replication SID is local to a Node, the Replication SID o=
f the Replication segment at Root (or Headend) node can be used as a (cons=
tant) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"col=
or:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in=
 8204 and the Replication SID as defined here is that the former is instan=
tiated just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream no=
des.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Ris=
habh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 6:31 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a=
>; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">=
cfilsfil@cisco.com</a>&gt;; Rishabh Parekh (riparekh) &lt;<a href=3D"mailt=
o:riparekh@cisco.com">riparekh@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear colleagues,<o:p></o:p></p>
<p class=3D"MsoNormal">I have read the <a href=3D"https://clicktime.symant=
ec.com/3G11JyktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%=
2Fdraft-voyer-spring-sr-replication-segment-00">
Replication SID draft</a>, and I have a few questions dealing with possibl=
e instantiation of the Replication SOD in
<a href=3D"https://clicktime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dh=
ttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpl=
s-22">
SR-MPLS</a>.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that &#=
8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;=
Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, Dow=
nstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that the=
 </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Cour=
ier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of </span><a href=3D=
"https://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F=
%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">RFC8402</span></a><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">? <o:p></o:p></s=
pan></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at</span> &#8220;<span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">A Replication branch to a particular Downstream No=
de could be represented by the node's Node </span><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">SID</span=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f">&#8221;. &nbsp;Does this mean that the Replication Node sends the packe=
ts it receives with the Replication SID as the active segment with the lab=
els representing the downstream Node SID as the active segment across such=
 a replication branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">Replication segment is instantiated at Downstream =
nodes and at the Replication node</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean th=
at the list of SIDs associated with the specific replication Branch is pus=
hed by the Replication Node on top of the label representing the Replicati=
on SID in the Downstream node of this branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-=
list:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </s=
pan></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Are the labels that=
 represent the Replication SID at the Downstream nodes downstream-allocate=
d by these nodes or upstream-allocated by the replication node? </span><sp=
an lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quo=
t;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &nbsp;&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-fa=
mily:&quot;Courier New&quot;">A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE</span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">&#8221;. These two op=
tions look exactly the same to me from the POV of the node on which the Re=
plication segment is programmed - what, if anything, did I miss?<o:p></o:p=
></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiat=
ion of the Replication Segment in SR-MPLS would be highly appreciated.<o:p=
></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><br>
__________________________________________________________________________=
_<br>
<br>
This e-mail message is intended for the recipient only and contains inform=
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
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transmission in error, please inform us by e-mail, phone or fax, and then =
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__________________________________________________________________________=
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This e-mail message is intended for the recipient only and contains inform=
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From: li zhenqiang <li_zhenqiang@hotmail.com>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, "spring@ietf.org" <spring@ietf.org>
CC: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
Thread-Topic: Re: [spring] FW: I-D Action: draft-ietf-spring-srv6-network-programming-03.txt
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/7_37ahKW7P5ltRgHxre5oGc01cE>
Subject: Re: [spring] FW: I-D Action: draft-ietf-spring-srv6-network-programming-03.txt
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To: Ron Bonica <rbonica@juniper.net>, SPRING WG List <spring@ietf.org>
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To: Ron Bonica <rbonica@juniper.net>, SPRING WG List <spring@ietf.org>
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: Rajesh M <mrajesh@juniper.net>, SPRING WG List <spring@ietf.org>
CC: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
Thread-Topic: 5.2.  T.Encaps: Transit with encapsulation in an SRv6 Policy 
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Date: Thu, 17 Oct 2019 09:40:48 +0000
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Subject: Re: [spring] 5.2. T.Encaps: Transit with encapsulation in an SRv6 Policy
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: Ron Bonica <rbonica@juniper.net>, SPRING WG List <spring@ietf.org>
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From: Rajesh M <mrajesh@juniper.net>
To: SPRING WG List <spring@ietf.org>, "cf@cisco.com" <cf@cisco.com>, "pcamaril@cisco.com" <pcamaril@cisco.com>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>, Ron Bonica <rbonica@juniper.net>
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Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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Authors of the draft could you please respond ?



Juniper Business Use Only
From: Rajesh M
Sent: Friday, October 11, 2019 7:16 AM
To: SPRING WG List <spring@ietf.org>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>
Subject: https://tools.ietf.org/html/draft-ietf-spring-srv6-network-program=
ming-04#page-24


Wanted to know the use case where we only POP the SRH ?

4.16.1<https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programmi=
ng-04#section-4.16.1>.  PSP: Penultimate Segment Pop of the SRH

   The SRH processing of the End, End.X and End.T behaviors are

   modified: after the instruction "S14.  Update IPv6 DA with Segment

   List[Segments Left]" is executed, the following instructions must be

   executed as well:



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }



Juniper Business Use Only

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<p class=3D"MsoNormal">Authors of the draft could you please respond ?<o:p>=
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
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0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Rajesh M <br>
<b>Sent:</b> Friday, October 11, 2019 7:16 AM<br>
<b>To:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;<br>
<b>Subject:</b> https://tools.ietf.org/html/draft-ietf-spring-srv6-network-=
programming-04#page-24<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre>Wanted to know the use case where we only POP the SRH ?<o:p></o:p></pr=
e>
<h4><a href=3D"https://tools.ietf.org/html/draft-ietf-spring-srv6-network-p=
rogramming-04#section-4.16.1">4.16.1</a><a name=3D"section-4.16.1"></a><spa=
n style=3D"font-family:&quot;Courier New&quot;">.&nbsp; PSP: Penultimate Se=
gment Pop of the SRH</span><o:p></o:p></h4>
<pre>&nbsp;&nbsp; The SRH processing of the End, End.X and End.T behaviors =
are<o:p></o:p></pre>
<pre>&nbsp;&nbsp; modified: after the instruction &quot;S14.&nbsp; Update I=
Pv6 DA with Segment<o:p></o:p></pre>
<pre>&nbsp;&nbsp; List[Segments Left]&quot; is executed, the following inst=
ructions must be<o:p></o:p></pre>
<pre>&nbsp;&nbsp; executed as well:<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&nbsp;&nbsp; S14.1.&nbsp;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p><=
/pre>
<pre>&nbsp;&nbsp; S14.2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:=
p></pre>
<pre>&nbsp;&nbsp; S14.3.&nbsp;&nbsp; }<o:p></o:p></pre>
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<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
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From: Rajesh M <mrajesh@juniper.net>
To: SPRING WG List <spring@ietf.org>, "cfilsfil@cisco.com" <cfilsfil@cisco.com>, "pbrisset@cisco.com" <pbrisset@cisco.com>, "swaagraw@cisco.com" <swaagraw@cisco.com>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>
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Subject: Re: [spring] https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02
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Authors of the draft could you please respond ?




Juniper Business Use Only
From: Rajesh M
Sent: Friday, October 11, 2019 7:00 AM
To: SPRING WG List <spring@ietf.org>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>
Subject: https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02

Section3:
However, when the received route is colored with an extended color
   community 'C' and Next-Hop 'N', and the ingress PE has a valid SRv6
   Policy (C, N) associated with SID list <S1,S2, S3> [I-D.filsfils-
   spring-segment-routing-policy], then the effective SR Policy is <S1,
   S2, S3, SRv6-Service-SID>.


When we make effective SR policy cant we remove S3 from List (S3 and SRv6-S=
ervice-SID both belong to Egress).
effective SR Policy can be <S1,S2, SRv6-Service-SID>.





Juniper Business Use Only

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<p class=3D"MsoNormal">Authors of the draft could you please respond ?<o:p>=
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Rajesh M <br>
<b>Sent:</b> Friday, October 11, 2019 7:00 AM<br>
<b>To:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;<br>
<b>Subject:</b> https://tools.ietf.org/html/draft-dawra-bess-srv6-services-=
02<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">Section3:&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">However, when the received route is colored with an extend=
ed color<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; community 'C' and Next-Hop 'N', and the ingre=
ss PE has a valid SRv6<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; Policy (C, N) associated with SID list &lt;S1=
,S2, S3&gt; [I-D.filsfils-<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; spring-segment-routing-policy], then the effe=
ctive SR Policy is &lt;S1,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; S2, S3, SRv6-Service-SID&gt;.<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">When we make effective SR policy cant we remove S3 from=
 List (S3 and SRv6-Service-SID both belong to Egress).<o:p></o:p></span></b=
></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">effective SR Policy can be &lt;S1,S2, SRv6-Service-SID&=
gt;.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
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From: Lizhenbin <lizhenbin@huawei.com>
To: "spring@ietf.org" <spring@ietf.org>, "ipv6@ietf.org" <ipv6@ietf.org>, "v6ops@ietf.org" <v6ops@ietf.org>
CC: Zafar Ali <zali@cisco.com>, Clarence Filsfils <cfilsfil@cisco.com>, "Satoru Matsushima" <satoru.matsushima@g.softbank.co.jp>
Thread-Topic: New Version Notification for draft-matsushima-spring-srv6-deployment-status-02.txt
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/5ywgAlmrbWaVmO9GXVuL8UBbA6M>
Subject: Re: [spring] https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02
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Hi Rajesh,

You are correct.

Thanks,
Ketan

From: spring <spring-bounces@ietf.org> On Behalf Of Rajesh M
Sent: 17 October 2019 17:58
To: SPRING WG List <spring@ietf.org>; Clarence Filsfils (cfilsfil) <cfilsfi=
l@cisco.com>; Patrice Brissette (pbrisset) <pbrisset@cisco.com>; Swadesh Ag=
rawal (swaagraw) <swaagraw@cisco.com>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>
Subject: Re: [spring] https://tools.ietf.org/html/draft-dawra-bess-srv6-ser=
vices-02

Authors of the draft could you please respond ?




Juniper Business Use Only
From: Rajesh M
Sent: Friday, October 11, 2019 7:00 AM
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02

Section3:
However, when the received route is colored with an extended color
   community 'C' and Next-Hop 'N', and the ingress PE has a valid SRv6
   Policy (C, N) associated with SID list <S1,S2, S3> [I-D.filsfils-
   spring-segment-routing-policy], then the effective SR Policy is <S1,
   S2, S3, SRv6-Service-SID>.


When we make effective SR policy cant we remove S3 from List (S3 and SRv6-S=
ervice-SID both belong to Egress).
effective SR Policy can be <S1,S2, SRv6-Service-SID>.





Juniper Business Use Only

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<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Hi Rajesh=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">You are c=
orrect.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Thanks,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Ketan<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;spring-bounces@ietf.org&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 17 October 2019 17:58<br>
<b>To:</b> SPRING WG List &lt;spring@ietf.org&gt;; Clarence Filsfils (cfils=
fil) &lt;cfilsfil@cisco.com&gt;; Patrice Brissette (pbrisset) &lt;pbrisset@=
cisco.com&gt;; Swadesh Agrawal (swaagraw) &lt;swaagraw@cisco.com&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;<br>
<b>Subject:</b> Re: [spring] https://tools.ietf.org/html/draft-dawra-bess-s=
rv6-services-02<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Authors of the draft could you =
please respond ?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Rajesh M
<br>
<b>Sent:</b> Friday, October 11, 2019 7:00 AM<br>
<b>To:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> <a href=3D"https://tools.ietf.org/html/draft-dawra-bess-srv=
6-services-02">
https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02</a><o:p></o:p=
></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">Section3:&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">However, when the received route is colored=
 with an extended color<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">&nbsp;&nbsp; community 'C' and Next-Hop 'N'=
, and the ingress PE has a valid SRv6<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">&nbsp;&nbsp; Policy (C, N) associated with =
SID list &lt;S1,S2, S3&gt; [I-D.filsfils-<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">&nbsp;&nbsp; spring-segment-routing-policy]=
, then the effective SR Policy is &lt;S1,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">&nbsp;&nbsp; S2, S3, SRv6-Service-SID&gt;.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">When we make effective SR policy cant we=
 remove S3 from List (S3 and SRv6-Service-SID both belong to Egress).<o:p><=
/o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">effective SR Policy can be &lt;S1,S2, SR=
v6-Service-SID&gt;.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
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From nobody Thu Oct 17 06:26:14 2019
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To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, "spring@ietf.org" <spring@ietf.org>
Cc: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
References: <1CFF7617-C996-45C0-8338-D7BD0E4BC206@cisco.com>
From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Removing a header from an IPv6 packet (without removing the whole IPv6 
header) is a violation of RFC 8200.

As such, it should be removed from the base network programming draft. 
If you really want it, put it in the new insertion draft.  And justify it.

With regard to the example of off-load, the usual practice has been to 
avoid standardizing off-load behaviors in the IETF.  the NIC vendors 
come up with all sorts of ways to improve performance that violate the 
specifications.  We do not endorse that, and leave the need for 
consenting devices engaging in proprietary communication to them.

Yours,
Joel

On 10/17/2019 5:41 AM, Pablo Camarillo (pcamaril) wrote:
> Li,
> 
>  Â Â  Node1's
> 
>  Â Â  Tenant-100 IPv4 table is: T.Encaps with SRv6 Policy <B:3:C4::,
> 
>  Â Â  B:8:D100::>.
> 
>  Â Â  When 1 receives a packet P from CE-A destined to 20.20.20.20, P looks
> 
>  Â Â  up its tenant-100 IPv4 table and finds an SR-VPN entry 20/8.Â  As a
> 
>  Â Â  consequence, 1 pushes an outer header with SA=A:1::, DA=B:3:C4::,
> 
>  Â Â  NH=SRH followed by SRH (B:8:D100::, B:3:C4::; SL=1; NH=4). 1 then
> 
>  Â Â  forwards the resulting packet on the interface to 2.
> 
>  Â Â  2 forwards to 3 along the path to B:3::/32.
> 
>  Â Â  When 3 receives the packet, 3 matches the DA in its "My SID Table"
> 
>  Â Â  and finds the bound function End.X to neighbor 4. 3 notes the PSP
> 
>  Â Â  capability of the SID B:3:C4::. 3 sets the DA to the next SID
> 
>  Â Â  B:8:D100::. As 3 is the penultimate segment hop, it performs PSP and
> 
>  Â Â  pops the SRH. 3 forwards the resulting packet to 4.
> 
>  Â Â  4, 6 and 7 forwards along the path to B:8::/32.
> 
>  Â  When 8 receives the packet, 8 matches the DA in its "My SID Table"
> 
>  Â Â  and finds the bound function End.DT(100).Â  As a result, 8 decaps the
> 
>  Â Â  outer header, looks up the inner IPv4 DA (20.20.20.20) in tenant-100
> 
>  Â Â  IPv4 table, and forward the (inner) IPv4 packet towards CE-B.
> 
> Node 3 receives the packet SA=A:1::, DA=B:3:C4::,NH=SRH followed by SRH 
> (B:8:D100::, B:3:C4::; SL=1; NH=4)
> 
> The SID B:3:C4:: is associated with the End.X behavior with PSP support. 
> Node 3 is going to decrement SL, copy the segment B:8:D100:: into the 
> IPv6 DA and set the packetâ€™s egress adjacency to J (adjacency associated 
> with that SID instance). Additionally, (PSP) it will check what is the 
> SL value in the SRH. If the SL=0 it will remove the SRH from the packet.
> 
> The segment B:3:C4:: is the penultimate SID in the segment list 
> <B:3:C4::, B:8:D100::>. Note that the PSP behavior is not related to IP 
> hops.
> 
> Cheers,
> 
> Pablo.
> 
> *From: *li zhenqiang <li_zhenqiang@hotmail.com>
> *Date: *Thursday, 17 October 2019 at 06:11
> *To: *"Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, Ron Bonica 
> <rbonica=40juniper.net@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>
> *Cc: *draft-ietf-spring-srv6-network-programming 
> <draft-ietf-spring-srv6-network-programming@ietf.org>
> *Subject: *Re: Re: [spring] draft-ietf-spring-srv6-network-programming: 
> Section 4.16
> 
> Hi Pablo,
> 
> I am still confused by the example in section 2.8.1. Node 3 is the 
> destionation of SID B:3:C4::, why should it behave PSP for this SID? 
> While for SIDÂ B:8:D100::, it is an END.DT4, the PSP behavior is not 
> defined for this kind of SIDs. Node 3 should not behave PSP for SID 
> B:8:D100::, neither. Â Would you please explain node 3 is the penultimate 
> segment hop of which node or which segment? Suppose the behavior is 
> correct, may I know the benifit you gain in this example?
> 
> Many Thanks,
> 
> Zhenqiang Li
> 
> ------------------------------------------------------------------------
> 
> li_zhenqiang@hotmail.com
> 
>     *From:*Pablo Camarillo (pcamaril) <mailto:pcamaril@cisco.com>
> 
>     *Date:*Â 2019-10-16Â 00:45
> 
>     *To:*li zhenqiang <mailto:li_zhenqiang@hotmail.com>; Ron Bonica
>     <mailto:rbonica=40juniper.net@dmarc.ietf.org>; spring@ietf.org
>     <mailto:spring@ietf.org>
> 
>     *CC:*draft-ietf-spring-srv6-network-programming
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
> 
>     *Subject:*Â Re: [spring] draft-ietf-spring-srv6-network-programming:
>     Section 4.16
> 
>     Li,
> 
>     I have replied the technical questions regarding PSP and USP in the
>     email thread from one week ago.
> 
>     You have not provided any technical concern.
> 
>     > â€œFurther, the example for PSP in the companion doc srv6-net-pgm-illustrationÂ is wrong. PSP is used for END.DT4 in the companion doc while flavors are only defined forÂ END, END.X and END.T  inÂ srv6-network-programming.â€
> 
>     The illustration in section 2.8.1 is correct. Please re-read it. PSP
>     is used at node 3 together with the End.X behavior.
> 
>     Regards,
> 
>     Pablo.
> 
>     Replies from one week ago:
> 
>     https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c
> 
>     https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak
> 
>     *From: *li zhenqiang <li_zhenqiang@hotmail.com>
>     *Date: *Tuesday, 15 October 2019 at 09:32
>     *To: *Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>,
>     "spring@ietf.org" <spring@ietf.org>
>     *Cc: *draft-ietf-spring-srv6-network-programming
>     <draft-ietf-spring-srv6-network-programming@ietf.org>
>     *Subject: *Re: [spring] draft-ietf-spring-srv6-network-programming:
>     Section 4.16
>     *Resent from: *<alias-bounces@ietf.org>
>     *Resent to: *<cf@cisco.com>, <pcamaril@cisco.com>, <john@leddy.net>,
>     <daniel.voyer@bell.ca>, <satoru.matsushima@g.softbank.co.jp>,
>     <lizhenbin@huawei.com>
>     *Resent date: *Tuesday, 15 October 2019 at 09:32
> 
>     I suggest this section be removed from this version until the
>     community reaches rough consensus.
> 
>     Further, the example for PSP in the companion doc
>     srv6-net-pgm-illustrationÂ is wrong. PSP is used for END.DT4 in the
>     companion doc while flavors are only defined forÂ END, END.X and
>     END.T inÂ srv6-network-programming.
> 
>     Best Regards,
> 
>     Zhenqiang Li
> 
>     ------------------------------------------------------------------------
> 
>     li_zhenqiang@hotmail.com
> 
>         *From:*Ron Bonica <mailto:rbonica=40juniper.net@dmarc.ietf.org>
> 
>         *Date:*Â 2019-10-15Â 02:42
> 
>         *To:*SPRING WG List <mailto:spring@ietf.org>
> 
>         *Subject:*Â [spring] draft-ietf-spring-srv6-network-programming:
>         Section 4.16
> 
>         Authors,
> 
>         Lacking the B.INSERT and T.INSERT functions, can you describe a
>         use-case for the PSP and USP flavors of the END, END.X and END.T
>         functions?
> 
>         Ron
> 
>         Juniper Business Use Only
> 
> 
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
> 


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From: Ron Bonica <rbonica@juniper.net>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>, 6man <6man@ietf.org>
Thread-Topic: Single Packet Contains Two Routing Headers (was:  [spring] draft-ietf-spring-srv6-network-programming-04: Section 2)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/wxnefX2EyqETjLKY1BGGYQMN2Qk>
Subject: [spring] Single Packet Contains Two Routing Headers (was: draft-ietf-spring-srv6-network-programming-04: Section 2)
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Pablo,

The two excerpts from RFC 8200, quoted below, should be understood in the c=
ontext of Postel's Rule. That is, "be conservative in what you send and tol=
erant in what you receive".

RFC 8200 says that a single packet should not include two Routing headers. =
So, in keeping with the first part of Postel's Rule, the IETF should never =
publish a specification that violates that rule, unless it updates or obsol=
etes RFC 8200.

RFC 8200 also says that if an implementation receives a packet that include=
s two Routing headers, it should attempt to process it. This is in keeping =
with the second part of Postel's Rule.

Your statement in draft-ietf-spring-srv6-network-programming goes well beyo=
nd the second part of Postel's rule. It doesn't say, "If a poorly behaved i=
mplementation sends you a packet that includes two Routing headers, attempt=
 to process them". It says, "We assume that the SRH may be present multiple=
 times inside each packet".

There is a big difference.

                                                                           =
           Ron






Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
Sent: Thursday, October 17, 2019 5:41 AM
To: Ron Bonica <rbonica@juniper.net>; SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Sectio=
n 2

Ron,

The intent is to define SIDs and their processing as general as possible to=
 accept whatever is received as per RFC8200. This is a reminder of that fac=
t.

Cheers,
Pablo.

From: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Date: Wednesday, 16 October 2019 at 01:43
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com<mailto:pcamaril@cisco.=
com>>, SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: RE: [spring] draft-ietf-spring-srv6-network-programming-04: Sectio=
n 2

Pablo,

I am sure that you have read RFC 8200 carefully enough to have noticed the =
following text:


"Each extension header should occur at most once, except for the Destinatio=
n Options header, which should occur at most twice (once before a Routing h=
eader and once before the upper-layer header).

This rule addresses the number of extension headers of any given type that =
can appear in a single packet. A packet that contains one IP header and two=
 routing headers would violate this rule.

You quote the following text, also from RFC 8200, omitting the final senten=
ces:


"IPv6 nodes must accept and attempt to process extension headers in any ord=
er and occurring any number of times in the same packet, except for the Hop=
-by-Hop Options header, which is restricted to appear immediately after an =
IPv6 header only.  Nonetheless, it is strongly advised that sources of IPv6=
 packets adhere to the above recommended order until and unless subsequent =
specifications revise

that recommendation."

Is it your intent to ignore the strong advice of RFC 8200 without offering =
any justification?

                                                                           =
                      Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.=
com>>
Sent: Tuesday, October 15, 2019 12:45 PM
To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>; SPRING WG=
 List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Sectio=
n 2

Ron,

That sentence is there on purpose. RFC8200:
   IPv6 nodes must accept and attempt to process extension headers in
   any order and occurring any number of times in the same packet

I will update that sentence in the next revision of the draft to make it mo=
re formal and include the normative reference:
"As per [RFC8200], multiple occurrences of the SRH might be present in the =
same IPv6 header."

Cheers,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Ron Bonica <rbonica=3D40juniper.net@dmarc.ietf.org<mailto:rbonica=
=3D40juniper.net@dmarc.ietf.org>>
Date: Monday, 14 October 2019 at 20:28
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: [spring] draft-ietf-spring-srv6-network-programming-04: Section 2

Authors,

In Section 2 of draft-ietf-spring-srv6-network-programming-04, you say:

"SRH: Segment Routing Header as defined in  [I-D.ietf-6man-segment-routing-=
header].  We assume that the SRH may be present multiple times inside each =
packet."

Did you mean to remove the final sentence?

                                     Ron



Juniper Business Use Only

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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The two excerpts from RFC 8200, quoted below, should=
 be understood in the context of Postel&#8217;s Rule. That is, &#8220;be co=
nservative in what you send and tolerant in what you receive&#8221;.<o:p></=
o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">RFC 8200 says that a single packet should not includ=
e two Routing headers. So, in keeping with the first part of Postel&#8217;s=
 Rule, the IETF should never publish a specification that violates that rul=
e, unless it updates or obsoletes RFC 8200.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">RFC 8200 also says that if an implementation receive=
s a packet that includes two Routing headers, it should attempt to process =
it. This is in keeping with the second part of Postel&#8217;s Rule.<o:p></o=
:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Your statement in draft-ietf-spring-srv6-network-pro=
gramming goes well beyond the second part of Postel&#8217;s rule. It doesn&=
#8217;t say, &#8220;If a poorly behaved implementation sends you a packet t=
hat includes two Routing headers, attempt to process
 them&#8221;. It says, &#8220;We assume that the SRH may be present multipl=
e times inside each packet&#8221;.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">There is a big difference.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;pcamaril=
@cisco.com&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 5:41 AM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;; SPRING WG List &lt;sprin=
g@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming-04:=
 Section 2<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Ron,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">The intent is to define SIDs an=
d their processing as general as possible to accept whatever is received as=
 per RFC8200. This is a reminder of that fact.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Cheers,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-si=
ze:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Ron Bonica &lt;<a h=
ref=3D"mailto:rbonica@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Date: </b>Wednesday, 16 October 2019 at 01:43<br>
<b>To: </b>&quot;Pablo Camarillo (pcamaril)&quot; &lt;<a href=3D"mailto:pca=
maril@cisco.com">pcamaril@cisco.com</a>&gt;, SPRING WG List &lt;<a href=3D"=
mailto:spring@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Subject: </b>RE: [spring] draft-ietf-spring-srv6-network-programming-04:=
 Section 2<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">I am sure that you have r=
ead RFC 8200 carefully enough to have noticed the following text:<o:p></o:p=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<pre style=3D"margin-left:.5in"><span style=3D"color:black">&#8220;Each ext=
ension header should occur at most once, except for the Destination Options=
 header, which should occur at most twice (once before a Routing header and=
 once before the upper-layer header).</span><o:p></o:p></pre>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">This rule addresses the n=
umber of extension headers of any given type that can appear in a single pa=
cket. A packet that contains one IP header and two routing headers would vi=
olate this rule.&nbsp;
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">You quote the following t=
ext, also from RFC 8200, omitting the final sentences:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<pre style=3D"margin-left:.5in"><span style=3D"font-family:&quot;Calibri&qu=
ot;,sans-serif">&#8220;</span><span style=3D"color:black">IPv6 nodes must a=
ccept and attempt to process extension headers in any order and occurring a=
ny number of times in the same packet, except for the Hop-by-Hop Options he=
ader, which is restricted to appear immediately after an IPv6 header only.&=
nbsp; Nonetheless, it is strongly advised that sources of IPv6 packets adhe=
re to the above recommended order until and unless subsequent specification=
s revise</span><o:p></o:p></pre>
<pre style=3D"margin-left:.5in"><span style=3D"color:black">that recommenda=
tion.&#8221;</span><o:p></o:p></pre>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Is it your intent to igno=
re the strong advice of RFC 8200 without offering any justification?
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b>From:</b> Pablo Camari=
llo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com=
</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 12:45 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net">rbonica@ju=
niper.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">sp=
ring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming-04:=
 Section 2<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Ron,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">That sentence is there on=
 purpose. RFC8200:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-famil=
y:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; IPv6 nodes must accept =
and attempt to process extension headers in</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-famil=
y:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; any order and occurring=
 any number of times in the same packet</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">I will update that senten=
ce in the next revision of the draft to make it more formal and include the=
 normative reference:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&#8220;As per [RFC8200], =
multiple occurrences of the SRH might be present in the same IPv6 header.&#=
8221;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Cheers,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Pablo.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-GB">&nbs=
p;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-GB">&nbs=
p;</span><o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><b><span style=3D"font-s=
ize:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">spring &lt;</span><=
span lang=3D"ES"><a href=3D"mailto:spring-bounces@ietf.org"><span lang=3D"E=
N-US" style=3D"font-size:12.0pt">spring-bounces@ietf.org</span></a></span><=
span style=3D"font-size:12.0pt;color:black">&gt; on
 behalf of Ron Bonica &lt;</span><span lang=3D"ES"><a href=3D"mailto:rbonic=
a=3D40juniper.net@dmarc.ietf.org"><span lang=3D"EN-US" style=3D"font-size:1=
2.0pt">rbonica=3D40juniper.net@dmarc.ietf.org</span></a></span><span style=
=3D"font-size:12.0pt;color:black">&gt;<br>
<b>Date: </b>Monday, 14 October 2019 at 20:28<br>
<b>To: </b>SPRING WG List &lt;</span><span lang=3D"ES"><a href=3D"mailto:sp=
ring@ietf.org"><span lang=3D"EN-US" style=3D"font-size:12.0pt">spring@ietf.=
org</span></a></span><span style=3D"font-size:12.0pt;color:black">&gt;<br>
<b>Subject: </b>[spring] draft-ietf-spring-srv6-network-programming-04: Sec=
tion 2</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">In Section 2 of draft-ie=
tf-spring-srv6-network-programming-04, you say:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&#8220;SRH: Segment Rout=
ing Header as defined in&nbsp; [I-D.ietf-6man-segment-routing-header].&nbsp=
; We assume that the SRH may be present multiple times inside each packet.&=
#8221;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Did you mean to remove t=
he final sentence?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<span lang=3D"ES">Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><span lang=3D"ES">&nbsp;=
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><span lang=3D"ES">&nbsp;=
<o:p></o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:1.0in;margin-bottom:.0=
001pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
</div>
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: Rajesh M <mrajesh@juniper.net>, SPRING WG List <spring@ietf.org>, draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>, Ron Bonica <rbonica@juniper.net>
Thread-Topic: https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
Thread-Index: AdV/1RRRlwgh7tiPSkiKObnXdT1kiQFEBfnwAAwv1oA=
Date: Thu, 17 Oct 2019 16:08:47 +0000
Message-ID: <FABFCAC3-BD28-4237-B269-79B3D289F965@cisco.com>
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To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, "spring@ietf.org" <spring@ietf.org>
Cc: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
References: <1CFF7617-C996-45C0-8338-D7BD0E4BC206@cisco.com> <4d6b2a58-957d-2c74-b6c1-6bd3cc03bf5e@joelhalpern.com> <E5E280C6-EE9E-4081-ADE5-0523DD312D04@cisco.com>
From: "Joel M. Halpern" <jmh@joelhalpern.com>
Message-ID: <4604bdbc-d5e0-3c7d-96b4-a91dfd90a1ef@joelhalpern.com>
Date: Thu, 17 Oct 2019 12:14:13 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/tDg0-cXmlb-a0e4kiyFp2yhQrdo>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Pretending it is legitimate, let me ask a different aspect of the question.

Removing bytes (aor adding bytes) from arbitrary positions in the middle 
of a packet is generally any extremely painful operation.  Why would we 
want a standard that mandated such an operation?  Savings a few bytes on 
SR hop (sure, several IP router hops) seems a small benefit for such a cost.

Yours,
Joel

On 10/17/2019 12:09 PM, Pablo Camarillo (pcamaril) wrote:
> Hi Joel,
> 
> RFC8200 permits extension header processing, insertion, deletion at a node identified in the Destination Address field of the IPv6 header. This has been discussed in other threads like https://mailarchive.ietf.org/arch/msg/ipv6/Ypnpw-oneCb7W6s41dVZGMok0Nw .
> 
> Thanks,
> Pablo
> 
> ï»¿-----Original Message-----
> From: "Joel M. Halpern" <jmh@joelhalpern.com>
> Date: Thursday, 17 October 2019 at 15:26
> To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, "spring@ietf.org" <spring@ietf.org>
> Cc: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
> Resent from: <alias-bounces@ietf.org>
> Resent to: <cf@cisco.com>, <pcamaril@cisco.com>, <john@leddy.net>, <daniel.voyer@bell.ca>, <satoru.matsushima@g.softbank.co.jp>, <lizhenbin@huawei.com>
> Resent date: Thursday, 17 October 2019 at 15:26
> 
>      Removing a header from an IPv6 packet (without removing the whole IPv6
>      header) is a violation of RFC 8200.
>      
>      As such, it should be removed from the base network programming draft.
>      If you really want it, put it in the new insertion draft.  And justify it.
>      
>      With regard to the example of off-load, the usual practice has been to
>      avoid standardizing off-load behaviors in the IETF.  the NIC vendors
>      come up with all sorts of ways to improve performance that violate the
>      specifications.  We do not endorse that, and leave the need for
>      consenting devices engaging in proprietary communication to them.
>      
>      Yours,
>      Joel
>      
>      On 10/17/2019 5:41 AM, Pablo Camarillo (pcamaril) wrote:
>      > Li,
>      >
>      >     Node1's
>      >
>      >     Tenant-100 IPv4 table is: T.Encaps with SRv6 Policy <B:3:C4::,
>      >
>      >     B:8:D100::>.
>      >
>      >     When 1 receives a packet P from CE-A destined to 20.20.20.20, P looks
>      >
>      >     up its tenant-100 IPv4 table and finds an SR-VPN entry 20/8.  As a
>      >
>      >     consequence, 1 pushes an outer header with SA=A:1::, DA=B:3:C4::,
>      >
>      >     NH=SRH followed by SRH (B:8:D100::, B:3:C4::; SL=1; NH=4). 1 then
>      >
>      >     forwards the resulting packet on the interface to 2.
>      >
>      >     2 forwards to 3 along the path to B:3::/32.
>      >
>      >     When 3 receives the packet, 3 matches the DA in its "My SID Table"
>      >
>      >     and finds the bound function End.X to neighbor 4. 3 notes the PSP
>      >
>      >     capability of the SID B:3:C4::. 3 sets the DA to the next SID
>      >
>      >     B:8:D100::. As 3 is the penultimate segment hop, it performs PSP and
>      >
>      >     pops the SRH. 3 forwards the resulting packet to 4.
>      >
>      >     4, 6 and 7 forwards along the path to B:8::/32.
>      >
>      >    When 8 receives the packet, 8 matches the DA in its "My SID Table"
>      >
>      >     and finds the bound function End.DT(100).  As a result, 8 decaps the
>      >
>      >     outer header, looks up the inner IPv4 DA (20.20.20.20) in tenant-100
>      >
>      >     IPv4 table, and forward the (inner) IPv4 packet towards CE-B.
>      >
>      > Node 3 receives the packet SA=A:1::, DA=B:3:C4::,NH=SRH followed by SRH
>      > (B:8:D100::, B:3:C4::; SL=1; NH=4)
>      >
>      > The SID B:3:C4:: is associated with the End.X behavior with PSP support.
>      > Node 3 is going to decrement SL, copy the segment B:8:D100:: into the
>      > IPv6 DA and set the packetâ€™s egress adjacency to J (adjacency associated
>      > with that SID instance). Additionally, (PSP) it will check what is the
>      > SL value in the SRH. If the SL=0 it will remove the SRH from the packet.
>      >
>      > The segment B:3:C4:: is the penultimate SID in the segment list
>      > <B:3:C4::, B:8:D100::>. Note that the PSP behavior is not related to IP
>      > hops.
>      >
>      > Cheers,
>      >
>      > Pablo.
>      >
>      > *From: *li zhenqiang <li_zhenqiang@hotmail.com>
>      > *Date: *Thursday, 17 October 2019 at 06:11
>      > *To: *"Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, Ron Bonica
>      > <rbonica=40juniper.net@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>
>      > *Cc: *draft-ietf-spring-srv6-network-programming
>      > <draft-ietf-spring-srv6-network-programming@ietf.org>
>      > *Subject: *Re: Re: [spring] draft-ietf-spring-srv6-network-programming:
>      > Section 4.16
>      >
>      > Hi Pablo,
>      >
>      > I am still confused by the example in section 2.8.1. Node 3 is the
>      > destionation of SID B:3:C4::, why should it behave PSP for this SID?
>      > While for SID B:8:D100::, it is an END.DT4, the PSP behavior is not
>      > defined for this kind of SIDs. Node 3 should not behave PSP for SID
>      > B:8:D100::, neither.  Would you please explain node 3 is the penultimate
>      > segment hop of which node or which segment? Suppose the behavior is
>      > correct, may I know the benifit you gain in this example?
>      >
>      > Many Thanks,
>      >
>      > Zhenqiang Li
>      >
>      > ------------------------------------------------------------------------
>      >
>      > li_zhenqiang@hotmail.com
>      >
>      >     *From:*Pablo Camarillo (pcamaril) <mailto:pcamaril@cisco.com>
>      >
>      >     *Date:* 2019-10-16 00:45
>      >
>      >     *To:*li zhenqiang <mailto:li_zhenqiang@hotmail.com>; Ron Bonica
>      >     <mailto:rbonica=40juniper.net@dmarc.ietf.org>; spring@ietf.org
>      >     <mailto:spring@ietf.org>
>      >
>      >     *CC:*draft-ietf-spring-srv6-network-programming
>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
>      >
>      >     *Subject:* Re: [spring] draft-ietf-spring-srv6-network-programming:
>      >     Section 4.16
>      >
>      >     Li,
>      >
>      >     I have replied the technical questions regarding PSP and USP in the
>      >     email thread from one week ago.
>      >
>      >     You have not provided any technical concern.
>      >
>      >     > â€œFurther, the example for PSP in the companion doc srv6-net-pgm-illustration is wrong. PSP is used for END.DT4 in the companion doc while flavors are only defined for END, END.X and END.T  in srv6-network-programming.â€
>      >
>      >     The illustration in section 2.8.1 is correct. Please re-read it. PSP
>      >     is used at node 3 together with the End.X behavior.
>      >
>      >     Regards,
>      >
>      >     Pablo.
>      >
>      >     Replies from one week ago:
>      >
>      >     https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c
>      >
>      >     https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak
>      >
>      >     *From: *li zhenqiang <li_zhenqiang@hotmail.com>
>      >     *Date: *Tuesday, 15 October 2019 at 09:32
>      >     *To: *Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>,
>      >     "spring@ietf.org" <spring@ietf.org>
>      >     *Cc: *draft-ietf-spring-srv6-network-programming
>      >     <draft-ietf-spring-srv6-network-programming@ietf.org>
>      >     *Subject: *Re: [spring] draft-ietf-spring-srv6-network-programming:
>      >     Section 4.16
>      >     *Resent from: *<alias-bounces@ietf.org>
>      >     *Resent to: *<cf@cisco.com>, <pcamaril@cisco.com>, <john@leddy.net>,
>      >     <daniel.voyer@bell.ca>, <satoru.matsushima@g.softbank.co.jp>,
>      >     <lizhenbin@huawei.com>
>      >     *Resent date: *Tuesday, 15 October 2019 at 09:32
>      >
>      >     I suggest this section be removed from this version until the
>      >     community reaches rough consensus.
>      >
>      >     Further, the example for PSP in the companion doc
>      >     srv6-net-pgm-illustration is wrong. PSP is used for END.DT4 in the
>      >     companion doc while flavors are only defined for END, END.X and
>      >     END.T in srv6-network-programming.
>      >
>      >     Best Regards,
>      >
>      >     Zhenqiang Li
>      >
>      >     ------------------------------------------------------------------------
>      >
>      >     li_zhenqiang@hotmail.com
>      >
>      >         *From:*Ron Bonica <mailto:rbonica=40juniper.net@dmarc.ietf.org>
>      >
>      >         *Date:* 2019-10-15 02:42
>      >
>      >         *To:*SPRING WG List <mailto:spring@ietf.org>
>      >
>      >         *Subject:* [spring] draft-ietf-spring-srv6-network-programming:
>      >         Section 4.16
>      >
>      >         Authors,
>      >
>      >         Lacking the B.INSERT and T.INSERT functions, can you describe a
>      >         use-case for the PSP and USP flavors of the END, END.X and END.T
>      >         functions?
>      >
>      >         Ron
>      >
>      >         Juniper Business Use Only
>      >
>      >
>      > _______________________________________________
>      > spring mailing list
>      > spring@ietf.org
>      > https://www.ietf.org/mailman/listinfo/spring
>      >
>      
> 


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Subject: Re: [spring] draft-ietf-spring-segment-routing-policy
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From: "Rishabh Parekh (riparekh)" <riparekh@cisco.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
CC: "spring@ietf.org" <spring@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "zzhang@juniper.net" <zzhang@juniper.net>, "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>
Thread-Topic: Some questions regarding Replication SID
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Date: Thu, 17 Oct 2019 18:37:35 +0000
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Subject: Re: [spring] Some questions regarding Replication SID
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Sasha,


1. The draft says that "each branch is abstracted to a <Downstream Node, Do=
wnstream Replication-SID>".  Does that mean that the Downstream Replication=
-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https://=
clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.i=
etf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you =
point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that=
 represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actual=
ly I wanted to ask whether the SIDs in the list that represent a specific R=
eplication Branch are the SIDs defined in RFC 8204. The text I see in the S=
R P2MP Policy<https://tools.ietf.org/html/draft-voyer-pim-sr-p2mp-policy-00=
> draft seems to suggest that it is not necessarily so  because a Tree-SID =
is considered also as the Replication SID. This looks inconsistent to me be=
cause a Replication SID as defined in this draft is instantiated both in th=
e Replication node and in the Downstream nodes while the Tree-SID does not =
require instantiation in the Leaf nodes (this is optional).

[RP]I am not sure I completely understand your questions above. Let's break=
 them down and see if my responses clarify them:
Actually I wanted to ask whether the SIDs in the list that represent a spec=
ific Replication Branch are the SIDs defined in RFC 8204
[RP] I think my responses to questions 2 and 3 in your original e-mail shou=
ld make this clear. Let me know if it is not.

The text I see in the SR P2MP Policy<https://tools.ietf.org/html/draft-voye=
r-pim-sr-p2mp-policy-00> draft seems to suggest that it is not necessarily =
so  because a Tree-SID is considered also as the Replication SID.
[RP]SR P2MP Policy draft specifies a way to create P2MP trees by stitching =
Replication Segments together. The Replication SID of the Replication segme=
nt at root of a tree is called Tree-SID since this SID allows packets to be=
 replicated across the tree.

This looks inconsistent to me because a Replication SID as defined in this =
draft is instantiated both in the Replication node and in the Downstream no=
des while the Tree-SID does not require instantiation in the Leaf nodes (th=
is is optional).
[RP]Replication segment draft describes how a *single* Replication segment =
can be used for a Multi-point service. In that case, the Replication SID at=
 downstream nodes (which are the Leaf nodes of the service) is used to deri=
ve service context. The P2MP policy draft  makes Replication segments at Le=
af nodes OPTIONAL when it is possible to derive service context from some o=
ther information in the packet. Thinking more about this, even for the sing=
le Replication segment, it might be possible to avoid instantiation at Down=
stream nodes when service context can be derived from some other informatio=
n in the packet. We might consider this for next revision.



[RP] You are right in that it does not matter how Replication segment is in=
stantiated at a node. The use of PCE is relevant for SR P2MP Policy<https:/=
/clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatra=
cker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PCE in=
stantiates Replication segments.[[Sasha]] OK, I will  look up the second dr=
aft. BTW, it does not appear as a reference in this one - is it intentional=
?
[RP]The P2MP policy draft uses Replication segment draft as a base, but it =
is not the other way around. We can add a Informative reference in next rev=
ision if you think it will help.


1. Did you consider a possibility of advertising the Replication Segment fr=
om the Downstream nodes to the Replication one using some multicast routing=
 protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a pos=
sibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of S=
R is to simplify. The idea is same here - use replication segments to reali=
ze P2MP trees computed by PCE (without need of multicast protocols) as spec=
ified in SR P2MP draft[[Sasha]] One of the well-known aspects that make mul=
ticast different is that the traffic in the Service Provider domain is driv=
en by the dynamic customer requests. Handling these requests via a PCE look=
s problematic to me.
[RP]SR P2MP MVPN<https://datatracker.ietf.org/doc/draft-parekh-bess-mvpn-sr=
-p2mp/> draft,  which will be updated soon, specifies procedures for dynami=
c updates SR P2MP trees using BGP MVPN; this includes dampening procedures =
to control interaction between PCC (root of tree) and PCE.

Pleade note that if the anser to #3 in my original message is positive, the=
n the statement in the draft that say the Replication Segment is similar to=
 the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the R=
eplication segment at Root (or Headend) node can be used as a (constant) Bi=
nding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and the=
 Replication SID as defined here is that the former is instantiated just lo=
cally while the Replication SID is instantiated both in the Replication nod=
e and in the Downstream nodes.
[RP]Here we use "Binding SID" to denote that fact that Replication SID (or =
Tree-SID for P2MP trees) at the Root MAY be used as a constant SID that all=
ows packets to be steered into a Replication segment or a P2MP tree. Note t=
he drafts do not exclude the possibility that Replication SIDs at downstrea=
m nodes or non-Root Replication segments can change.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Sent: Wednesday, October 16, 2019 10:26 PM
To: Rishabh Parekh (riparekh) <riparekh@cisco.com>
Cc: spring@ietf.org; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com>; hoo=
man.bidgoli@nokia.com; zzhang@juniper.net; daniel.voyer@bell.ca
Subject: RE: Some questions regarding Replication SID

Re-sending with corrected To and CC lists...

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecite=
le.com>

From: Alexander Vainshtein
Sent: Thursday, October 17, 2019 8:25 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Rishabh Parekh (riparekh) <rip=
arekh@cisco.com<mailto:riparekh@cisco.com>>; Clarence Filsfils (cfilsfil) <=
cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<ma=
ilto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper.ne=
t>
Subject: RE: Some questions regarding Replication SID

Rishabh,
Lots of thanks for a prompt and detailed response.

Please see more inline below.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecite=
le.com>

From: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.c=
om>>
Sent: Thursday, October 17, 2019 1:24 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexander=
.Vainshtein@ecitele.com>>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca=
>; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisco.c=
om>>; hooman.bidgoli@nokia.com<mailto:hooman.bidgoli@nokia.com>; zzhang@jun=
iper.net<mailto:zzhang@juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: RE: Some questions regarding Replication SID

Alexander,
Responses to your queries are prefaced with [RP].


1. The draft says that "each branch is abstracted to a <Downstream Node, Do=
wnstream Replication-SID>".  Does that mean that the Downstream Replication=
-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https://=
clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.i=
etf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you =
point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that=
 represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actual=
ly I wanted to ask whether the SIDs in the list that represent a specific R=
eplication Branch are the SIDs defined in RFC 8204. The text I see in the S=
R P2MP Policy<https://tools.ietf.org/html/draft-voyer-pim-sr-p2mp-policy-00=
> draft seems to suggest that it is not necessarily so  because a Tree-SID =
is considered also as the Replication SID. This looks inconsistent to me be=
cause a Replication SID as defined in this draft is instantiated both in th=
e Replication node and in the Downstream nodes while the Tree-SID does not =
require instantiation in the Leaf nodes (this is optional).



2. The draft also says that "A Replication branch to a particular Downstrea=
m Node could be represented by the node's Node SID".  Does this mean that t=
he Replication Node sends the packets it receives with the Replication SID =
as the active segment with the labels representing the downstream Node SID =
as the active segment across such a replication branch?

[RP] No, Replication SID relevant at a downstream node would be the bottom =
label with other SIDs stacked on top which would guide the packet to the do=
wnstream node. Of course, if the Downstream node is adjacent to the Replica=
tion node, only the Replication SID would be present in the outgoing packet=
.[[Sasha]] OK, thanks.



3. The draft also says that "Replication segment is instantiated at Downstr=
eam nodes and at the Replication node".  Does that mean that the list of SI=
Ds associated with the specific replication Branch is pushed by the Replica=
tion Node on top of the label representing the Replication SID in the Downs=
tream node of this branch?

[RP] Yes. See response to 2 above.[[Sasha]] OK, thanks again.



4. Are the labels that represent the Replication SID at the Downstream node=
s downstream-allocated by these nodes or upstream-allocated by the replicat=
ion node?

[RP] Since the Replication SID is locally relevant at a node, the Replicati=
on SID would be downstream-allocated. However, it may also be allocated by =
PCE; see response to 5, 6 below.[[Sasha]] OK, thanks.



5. The draft also says that  "A Replication segment can be either provision=
ed locally on a node or programmed by a PCE". These two options look exactl=
y the same to me from the POV of the node on which the Replication segment =
is programmed - what, if anything, did I miss?

[RP] You are right in that it does not matter how Replication segment is in=
stantiated at a node. The use of PCE is relevant for SR P2MP Policy<https:/=
/clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatra=
cker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PCE in=
stantiates Replication segments.[[Sasha]] OK, I will  look up the second dr=
aft. BTW, it does not appear as a reference in this one - is it intentional=
?



6. Did you consider a possibility of advertising the Replication Segment fr=
om the Downstream nodes to the Replication one using some multicast routing=
 protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a pos=
sibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of S=
R is to simplify. The idea is same here - use replication segments to reali=
ze P2MP trees computed by PCE (without need of multicast protocols) as spec=
ified in SR P2MP draft[[Sasha]] One of the well-known aspects that make mul=
ticast different is that the traffic in the Service Provider domain is driv=
en by the dynamic customer requests. Handling these requests via a PCE look=
s problematic to me.



Any details regarding instantiation of the Replication Segment in SR-MPLS w=
ould be highly appreciated.

[RP]SR P2MP policy draft lists different protocols (PCEP, BGP, etc.) that c=
an be used to instantiate Replication segments. SR P2MP PCEP<https://clickt=
ime.symantec.com/3JuFtE8qkd9Viz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf.or=
g%2Fhtml%2Fdraft-dhs-spring-pce-sr-p2mp-policy-00> would be updated; other =
drafts will be published in future.


More of the same...
Pleade note that if the anser to #3 in my original message is positive, the=
n the statement in the draft that say the Replication Segment is similar to=
 the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the R=
eplication segment at Root (or Headend) node can be used as a (constant) Bi=
nding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and the=
 Replication SID as defined here is that the former is instantiated just lo=
cally while the Replication SID is instantiated both in the Replication nod=
e and in the Downstream nodes.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexand=
er.Vainshtein@ecitele.com>>
Sent: Tuesday, October 15, 2019 6:31 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>; Clarence Filsfils (c=
filsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; Rishabh Parekh (r=
iparekh) <riparekh@cisco.com<mailto:riparekh@cisco.com>>; hooman.bidgoli@no=
kia.com<mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@=
juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: Some questions regarding Replication SID

Dear colleagues,
I have read the Replication SID draft<https://clicktime.symantec.com/3G11Jy=
ktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-=
spring-sr-replication-segment-00>, and I have a few questions dealing with =
possible instantiation of the Replication SOD in SR-MPLS<https://clicktime.=
symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2F=
html%2Fdraft-ietf-spring-segment-routing-mpls-22>.


1. The draft says that "each branch is abstracted to a <Downstream Node, Do=
wnstream Replication-SID>".  Does that mean that the Downstream Replication=
-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https://=
clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.i=
etf.org%2Fhtml%2Frfc8402>?

2. The draft also says that "A Replication branch to a particular Downstrea=
m Node could be represented by the node's Node SID".  Does this mean that t=
he Replication Node sends the packets it receives with the Replication SID =
as the active segment with the labels representing the downstream Node SID =
as the active segment across such a replication branch?

3. The draft also says that "Replication segment is instantiated at Downstr=
eam nodes and at the Replication node".  Does that mean that the list of SI=
Ds associated with the specific replication Branch is pushed by the Replica=
tion Node on top of the label representing the Replication SID in the Downs=
tream node of this branch?

4. Are the labels that represent the Replication SID at the Downstream node=
s downstream-allocated by these nodes or upstream-allocated by the replicat=
ion node?

5. The draft also says that  "A Replication segment can be either provision=
ed locally on a node or programmed by a PCE". These two options look exactl=
y the same to me from the POV of the node on which the Replication segment =
is programmed - what, if anything, did I miss?

6. Did you consider a possibility of advertising the Replication Segment fr=
om the Downstream nodes to the Replication one using some multicast routing=
 protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a pos=
sibility strictly precluded?



Any details regarding instantiation of the Replication Segment in SR-MPLS w=
ould be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecite=
le.com>


___________________________________________________________________________

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___________________________________________________________________________

This e-mail message is intended for the recipient only and contains informa=
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this
transmission in error, please inform us by e-mail, phone or fax, and then d=
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and all copies thereof.
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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Sasha=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft says that &#8220;</span><span lang=3D"EN" sty=
le=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">each branch is =
abstracted to a &lt;Downstream Node, Downstream Replication-SID&gt;</span><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">=
&#8221;. &nbsp;Does that mean that the </span><span lang=3D"EN" style=3D"fo=
nt-size:12.0pt;font-family:&quot;Courier New&quot;">Downstream Replication-=
SID</span><span lang=3D"EN" style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif"> </span><span style=3D"font-size:11.0pt;font-family:=
&quot;Calibri&quot;,sans-serif">is one of the SIDs defined in Sections 3, 4=
 and 5&nbsp; of <a href=3D"https://clicktime.symantec.com/3XUuhGHPMpikj1KmC=
oXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc8402">RFC8402</a>?<o=
:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Replicat=
ion SID not a topological SID as defined the sections you point to in RFC 8=
402. Instead, it is a separate SID (label in SR-MPLS) that represents the R=
eplication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.0=
pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </sp=
an></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&=
quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the proc=
ess of writing. Actually I wanted to ask whether the SIDs in the list that =
represent a specific Replication Branch are the SIDs defined in RFC 8204. T=
he text I see in the </span></i></b><b><i><span style=3D"font-size:11.0pt;f=
ont-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><a href=3D"https:/=
/tools.ietf.org/html/draft-voyer-pim-sr-p2mp-policy-00">SR P2MP Policy</a> =
</span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:#00B0F0">draft seems to suggest that it is not n=
ecessarily so &nbsp;because a Tree-SID is considered also as the Replicatio=
n SID. This looks inconsistent to me because a Replication SID as defined i=
n this draft is instantiated both in the Replication node and in the Downst=
ream nodes while the Tree-SID does not require instantiation in the Leaf no=
des (this is optional). </span></i></b><span style=3D"font-size:11.0pt;font=
-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p></o:p></span></p=
re>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]I=
 am not sure I completely understand your questions above. Let&#8217;s brea=
k them down and see if my responses clarify them:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">Actually I wante=
d to ask whether the SIDs in the list that represent a specific Replication=
 Branch are the SIDs defined in RFC 8204</span></i></b><span style=3D"font-=
size:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP] =
I think my responses to questions 2 and 3 in your original e-mail should ma=
ke this clear. Let me know if it is not.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">The text I see i=
n the </span>
<span style=3D"color:#1F497D"><a href=3D"https://tools.ietf.org/html/draft-=
voyer-pim-sr-p2mp-policy-00">SR P2MP Policy</a>
</span><span style=3D"color:#00B0F0">draft seems to suggest that it is not =
necessarily so &nbsp;because a Tree-SID is considered also as the Replicati=
on SID.</span></i></b><span style=3D"font-size:10.0pt;color:#1F497D"><o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]S=
R P2MP Policy draft specifies a way to create P2MP trees by stitching Repli=
cation Segments together. The Replication SID of the Replication segment at=
 root of a tree is called Tree-SID since
 this SID allows packets to be replicated across the tree.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">This looks incon=
sistent to me because a Replication SID as defined in this draft is instant=
iated both in the Replication node and in the Downstream nodes while the Tr=
ee-SID does not require instantiation
 in the Leaf nodes (this is optional).</span></i></b><span style=3D"font-si=
ze:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]R=
eplication segment draft describes how a *<b>single</b>* Replication segmen=
t can be used for a Multi-point service. In that case, the Replication SID =
at downstream nodes (which are the Leaf
 nodes of the service) is used to derive service context. The P2MP policy d=
raft&nbsp; makes Replication segments at Leaf nodes OPTIONAL when it is pos=
sible to derive service context from some other information in the packet. =
Thinking more about this, even for the
 single Replication segment, it might be possible to avoid instantiation at=
 Downstream nodes when service context can be derived from some other infor=
mation in the packet. We might consider this for next revision.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are righ=
t in that it does not matter how Replication segment is instantiated at a n=
ode. The use of PCE is relevant for <a href=3D"https://clicktime.symantec.c=
om/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2=
Fdraft-voyer-pim-sr-p2mp-policy%2F">SR P2MP Policy</a> draft where PCE inst=
antiates Replication segments<span style=3D"color:#00B0F0">.<b><i>[[Sasha]]=
 OK, I will &nbsp;look up the second draft. BTW, it does not appear as a re=
ference in this one &#8211; is it intentional?</i></b> <o:p></o:p></span></=
span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]T=
he P2MP policy draft uses Replication segment draft as a base, but it is no=
t the other way around. We can add a Informative reference in next revision=
 if you think it will help.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l2 level1 lfo4"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">Did you consider a possibility of advertising the Repli=
cation Segment from the Downstream nodes to the Replication one using some =
multicast routing protocol (e.g., creating a SR-MPLS replacement for mLDP)?=
 Or is such a possibility strictly precluded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do not =
strictly preclude any protocol , but one of the goals of SR is to simplify.=
 The idea is same here - use replication segments to realize P2MP trees com=
puted by PCE (without need of multicast protocols) as specified in SR P2MP =
draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-known as=
pects that make multicast different is that the traffic in the Service Prov=
ider domain is driven by the dynamic customer requests. Handling these requ=
ests via a PCE looks problematic to me. </span></i></b><span style=3D"color=
:#00B0F0"><o:p></o:p></span></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]<=
a href=3D"https://datatracker.ietf.org/doc/draft-parekh-bess-mvpn-sr-p2mp/"=
>SR P2MP MVPN</a> draft,&nbsp; which will be updated soon, specifies proced=
ures for dynamic updates SR P2MP trees using
 BGP MVPN; this includes dampening procedures to control interaction betwee=
n PCC (root of tree) and PCE.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-size:=
10.0pt;color:#1F497D"></span><span style=3D"color:#212121">Pleade note that=
 if the anser to #3 in my original message is positive, then the statement =
in the draft that say the Replication Segment
 is similar to the Binding segment srems to be inaccurate.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">[RP] Since Replication SID is local to a Node, the Replication SID of =
the Replication segment at Root (or Headend) node can be used as a (constan=
t) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"colo=
r:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in 8=
204 and the Replication SID as defined here is that the former is instantia=
ted just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream nod=
es.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]H=
ere we use &#8220;Binding SID&#8221; to denote that fact that Replication S=
ID (or Tree-SID for P2MP trees) at the Root MAY be used as a constant SID t=
hat allows packets to be steered into a Replication
 segment or a P2MP tree. Note the drafts do not exclude the possibility tha=
t Replication SIDs at downstream nodes or non-Root Replication segments can=
 change.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Rish=
abh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;Alexander.Vain=
shtein@ecitele.com&gt;
<br>
<b>Sent:</b> Wednesday, October 16, 2019 10:26 PM<br>
<b>To:</b> Rishabh Parekh (riparekh) &lt;riparekh@cisco.com&gt;<br>
<b>Cc:</b> spring@ietf.org; Clarence Filsfils (cfilsfil) &lt;cfilsfil@cisco=
.com&gt;; hooman.bidgoli@nokia.com; zzhang@juniper.net; daniel.voyer@bell.c=
a<br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Re-sending with correc=
ted To and CC lists...<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-39266=
302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </s=
pan><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtei=
n@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein <br>
<b>Sent:</b> Thursday, October 17, 2019 8:25 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a>=
<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Rishabh =
Parekh (riparekh) &lt;<a href=3D"mailto:riparekh@cisco.com">riparekh@cisco.=
com</a>&gt;; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@ci=
sco.com">cfilsfil@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; <=
a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a p=
rompt and detailed response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please see more </span=
><b><i><span style=3D"color:#00B0F0">inline below</span></i></b><span style=
=3D"color:#1F497D">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-39266=
302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </s=
pan><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtei=
n@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;<a href=
=3D"mailto:riparekh@cisco.com">riparekh@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 1:24 AM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a>; Clarence =
Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@cisc=
o.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; <=
a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Alexa=
nder,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Respo=
nses to your queries are prefaced with [RP].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft says that &#8220;</span><span lang=3D"EN" sty=
le=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">each branch is =
abstracted to a &lt;Downstream Node, Downstream Replication-SID&gt;</span><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">=
&#8221;. &nbsp;Does that mean that the </span><span lang=3D"EN" style=3D"fo=
nt-size:12.0pt;font-family:&quot;Courier New&quot;">Downstream Replication-=
SID</span><span lang=3D"EN" style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif"> </span><span style=3D"font-size:11.0pt;font-family:=
&quot;Calibri&quot;,sans-serif">is one of the SIDs defined in Sections 3, 4=
 and 5&nbsp; of </span><a href=3D"https://clicktime.symantec.com/3XUuhGHPMp=
ikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span s=
tyle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">RFC840=
2</span></a><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;=
,sans-serif">?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Replicat=
ion SID not a topological SID as defined the sections you point to in RFC 8=
402. Instead, it is a separate SID (label in SR-MPLS) that represents the R=
eplication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.0=
pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </sp=
an></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&=
quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the proc=
ess of writing. Actually I wanted to ask whether the SIDs in the list that =
represent a specific Replication Branch are the SIDs defined in RFC 8204. T=
he text I see in the </span></i></b><a href=3D"https://tools.ietf.org/html/=
draft-voyer-pim-sr-p2mp-policy-00"><b><i><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span></i></b></a>=
<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1F497D"> </span></i></b><b><i><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif;color:#00B0F0">draft seems to su=
ggest that it is not necessarily so &nbsp;because a Tree-SID is considered =
also as the Replication SID. This looks inconsistent to me because a Replic=
ation SID as defined in this draft is instantiated both in the Replication =
node and in the Downstream nodes while the Tree-SID does not require instan=
tiation in the Leaf nodes (this is optional). </span></i></b><span style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"=
><o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that</span> &#8220;<span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Replicat=
ion branch to a particular Downstream Node could be represented by the node=
's Node </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quo=
t;Times New Roman&quot;,serif">SID</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does this mean tha=
t the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node S=
ID as the active segment across such a replication branch?<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Replicat=
ion SID relevant at a downstream node would be the bottom label with other =
SIDs stacked on top which would guide the packet to the downstream node. Of=
 course, if the Downstream node is adjacent to the Replication node, only t=
he Replication SID would be present in the outgoing packet<span style=3D"co=
lor:#00B0F0">.<b><i>[[Sasha]] OK, thanks</i></b></span><b><i><span style=3D=
"color:#1F497D">. </span></i></b><span style=3D"color:#1F497D">&nbsp;</span=
><o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &#8220;</span><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">Replicatio=
n segment is instantiated at Downstream nodes and at the Replication node</=
span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">&#8221;. &nbsp;Does that mean that the list of SIDs associated with t=
he specific replication Branch is pushed by the Replication Node on top of =
the label representing the Replication SID in the Downstream node of this b=
ranch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Yes. See res=
ponse to 2 above<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, thanks a=
gain.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span lang=3D"EN" style=3D"f=
ont-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-lis=
t:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span>=
</span></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif">Are the labels that represent the Replication SID =
at the Downstream nodes downstream-allocated by these nodes or upstream-all=
ocated by the replication node?</span><span lang=3D"EN" style=3D"font-size:=
12.0pt;font-family:&quot;Courier New&quot;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Since the Re=
plication SID is locally relevant at a node, the Replication SID would be d=
ownstream-allocated. However, it may also be allocated by PCE; see response=
 to 5, 6 below<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, thanks.</i=
></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span lang=3D"EN" =
style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;"><o:p>&nbsp;<=
/o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &nbsp;&#8220;</span><span lang=
=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Re=
plication segment can be either provisioned locally on a node or programmed=
 by a PCE</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&q=
uot;,sans-serif">&#8221;. These two options look exactly the same to me fro=
m the POV of the node on which the Replication segment is programmed - what=
, if anything, did I miss?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are righ=
t in that it does not matter how Replication segment is instantiated at a n=
ode. The use of PCE is relevant for </span><a href=3D"https://clicktime.sym=
antec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%=
2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F"><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span></a><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> draf=
t where PCE instantiates Replication segments<span style=3D"color:#00B0F0">=
.<b><i>[[Sasha]] OK, I will &nbsp;look up the second draft. BTW, it does no=
t appear as a reference in this one &#8211; is it intentional?</i></b> <o:p=
></o:p></span></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">Did you consider a possibility of advertising the Repli=
cation Segment from the Downstream nodes to the Replication one using some =
multicast routing protocol (e.g., creating a SR-MPLS replacement for mLDP)?=
 Or is such a possibility strictly precluded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do not =
strictly preclude any protocol , but one of the goals of SR is to simplify.=
 The idea is same here - use replication segments to realize P2MP trees com=
puted by PCE (without need of multicast protocols) as specified in SR P2MP =
draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-known as=
pects that make multicast different is that the traffic in the Service Prov=
ider domain is driven by the dynamic customer requests. Handling these requ=
ests via a PCE looks problematic to me. </span></i></b><span style=3D"color=
:#00B0F0"><o:p></o:p></span></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiatio=
n of the Replication Segment in SR-MPLS would be highly appreciated.<o:p></=
o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif">[RP]SR P2MP policy draft lists dif=
ferent protocols (PCEP, BGP, etc.) that can be used to instantiate Replicat=
ion segments. </span><a href=3D"https://clicktime.symantec.com/3JuFtE8qkd9V=
iz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-dhs-spring-p=
ce-sr-p2mp-policy-00"><span style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif">SR P2MP PCEP</span></a><span style=3D"font-size:11.0=
pt;font-family:&quot;Calibri&quot;,sans-serif"> would be updated; other dra=
fts will be published in future.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">More of the same...<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">Pleade note that if the anser to #3 in my original message is positive=
, then the statement in the draft that say the Replication Segment is simil=
ar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">[RP] Since Replication SID is local to a Node, the Replication SID of =
the Replication segment at Root (or Headend) node can be used as a (constan=
t) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"colo=
r:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in 8=
204 and the Replication SID as defined here is that the former is instantia=
ted just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream nod=
es.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Rish=
abh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"mai=
lto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&=
gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 6:31 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a>=
; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cf=
ilsfil@cisco.com</a>&gt;; Rishabh Parekh (riparekh) &lt;<a href=3D"mailto:r=
iparekh@cisco.com">riparekh@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; <=
a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear colleagues,<o:p></o:p></p>
<p class=3D"MsoNormal">I have read the <a href=3D"https://clicktime.symante=
c.com/3G11JyktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2F=
draft-voyer-spring-sr-replication-segment-00">
Replication SID draft</a>, and I have a few questions dealing with possible=
 instantiation of the Replication SOD in
<a href=3D"https://clicktime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dht=
tps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpls-=
22">
SR-MPLS</a>.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft says that &#8220;</span><span lang=3D"EN" sty=
le=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">each branch is =
abstracted to a &lt;Downstream Node, Downstream Replication-SID&gt;</span><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">=
&#8221;. &nbsp;Does that mean that the </span><span lang=3D"EN" style=3D"fo=
nt-size:12.0pt;font-family:&quot;Courier New&quot;">Downstream Replication-=
SID</span><span lang=3D"EN" style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif"> </span><span style=3D"font-size:11.0pt;font-family:=
&quot;Calibri&quot;,sans-serif">is one of the SIDs defined in Sections 3, 4=
 and 5&nbsp; of </span><a href=3D"https://clicktime.symantec.com/3XUuhGHPMp=
ikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span s=
tyle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">RFC840=
2</span></a><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;=
,sans-serif">? <o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that</span> &#8220;<span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Replicat=
ion branch to a particular Downstream Node could be represented by the node=
's Node </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quo=
t;Times New Roman&quot;,serif">SID</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does this mean tha=
t the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node S=
ID as the active segment across such a replication branch?<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &#8220;</span><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">Replicatio=
n segment is instantiated at Downstream nodes and at the Replication node</=
span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">&#8221;. &nbsp;Does that mean that the list of SIDs associated with t=
he specific replication Branch is pushed by the Replication Node on top of =
the label representing the Replication SID in the Downstream node of this b=
ranch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span lang=3D"EN" style=3D"f=
ont-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-lis=
t:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span>=
</span></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif">Are the labels that represent the Replication SID =
at the Downstream nodes downstream-allocated by these nodes or upstream-all=
ocated by the replication node? </span><span lang=3D"EN" style=3D"font-size=
:12.0pt;font-family:&quot;Courier New&quot;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &nbsp;&#8220;</span><span lang=
=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Re=
plication segment can be either provisioned locally on a node or programmed=
 by a PCE</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&q=
uot;,sans-serif">&#8221;. These two options look exactly the same to me fro=
m the POV of the node on which the Replication segment is programmed - what=
, if anything, did I miss?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">Did you consider a possibility of advertising the Repli=
cation Segment from the Downstream nodes to the Replication one using some =
multicast routing protocol (e.g., creating a SR-MPLS replacement for mLDP)?=
 Or is such a possibility strictly precluded?<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiatio=
n of the Replication Segment in SR-MPLS would be highly appreciated.<o:p></=
o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-5492663=
02<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vains=
htein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>, 6man <6man@ietf.org>
Thread-Topic: [spring] Single Packet Contains Two Routing Headers (was: draft-ietf-spring-srv6-network-programming-04: Section 2)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/RyvV3qEEcSs93zVOZRugvXx51J4>
Subject: Re: [spring] Single Packet Contains Two Routing Headers (was: draft-ietf-spring-srv6-network-programming-04: Section 2)
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Hi all,
FWIW I concur with Ron.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: spring <spring-bounces@ietf.org> On Behalf Of Ron Bonica
Sent: Thursday, October 17, 2019 7:02 PM
To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>; SPRING WG List <sprin=
g@ietf.org>; 6man <6man@ietf.org>
Subject: [spring] Single Packet Contains Two Routing Headers (was: draft-i=
etf-spring-srv6-network-programming-04: Section 2)

Pablo,

The two excerpts from RFC 8200, quoted below, should be understood in the =
context of Postel's Rule. That is, "be conservative in what you send and t=
olerant in what you receive".

RFC 8200 says that a single packet should not include two Routing headers.=
 So, in keeping with the first part of Postel's Rule, the IETF should neve=
r publish a specification that violates that rule, unless it updates or ob=
soletes RFC 8200.

RFC 8200 also says that if an implementation receives a packet that includ=
es two Routing headers, it should attempt to process it. This is in keepin=
g with the second part of Postel's Rule.

Your statement in draft-ietf-spring-srv6-network-programming goes well bey=
ond the second part of Postel's rule. It doesn't say, "If a poorly behaved=
 implementation sends you a packet that includes two Routing headers, atte=
mpt to process them". It says, "We assume that the SRH may be present mult=
iple times inside each packet".

There is a big difference.

                                                                          =
            Ron






Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco=
.com>>
Sent: Thursday, October 17, 2019 5:41 AM
To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>; SPRING W=
G List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Secti=
on 2

Ron,

The intent is to define SIDs and their processing as general as possible t=
o accept whatever is received as per RFC8200. This is a reminder of that f=
act.

Cheers,
Pablo.

From: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Date: Wednesday, 16 October 2019 at 01:43
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com<mailto:pcamaril@cisco=
.com>>, SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: RE: [spring] draft-ietf-spring-srv6-network-programming-04: Secti=
on 2

Pablo,

I am sure that you have read RFC 8200 carefully enough to have noticed the=
 following text:


"Each extension header should occur at most once, except for the Destinati=
on Options header, which should occur at most twice (once before a Routing=
 header and once before the upper-layer header).

This rule addresses the number of extension headers of any given type that=
 can appear in a single packet. A packet that contains one IP header and t=
wo routing headers would violate this rule.

You quote the following text, also from RFC 8200, omitting the final sente=
nces:


"IPv6 nodes must accept and attempt to process extension headers in any or=
der and occurring any number of times in the same packet, except for the H=
op-by-Hop Options header, which is restricted to appear immediately after =
an IPv6 header only.  Nonetheless, it is strongly advised that sources of =
IPv6 packets adhere to the above recommended order until and unless subseq=
uent specifications revise

that recommendation."

Is it your intent to ignore the strong advice of RFC 8200 without offering=
 any justification?

                                                                          =
                       Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco=
.com>>
Sent: Tuesday, October 15, 2019 12:45 PM
To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>; SPRING W=
G List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming-04: Secti=
on 2

Ron,

That sentence is there on purpose. RFC8200:
   IPv6 nodes must accept and attempt to process extension headers in
   any order and occurring any number of times in the same packet

I will update that sentence in the next revision of the draft to make it m=
ore formal and include the normative reference:
"As per [RFC8200], multiple occurrences of the SRH might be present in the=
 same IPv6 header."

Cheers,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on =
behalf of Ron Bonica <rbonica=3D40juniper.net@dmarc.ietf.org<mailto:rbonic=
a=3D40juniper.net@dmarc.ietf.org>>
Date: Monday, 14 October 2019 at 20:28
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: [spring] draft-ietf-spring-srv6-network-programming-04: Section 2=


Authors,

In Section 2 of draft-ietf-spring-srv6-network-programming-04, you say:

"SRH: Segment Routing Header as defined in  [I-D.ietf-6man-segment-routing=
-header].  We assume that the SRH may be present multiple times inside eac=
h packet."

Did you mean to remove the final sentence?

                                     Ron



Juniper Business Use Only

__________________________________________________________________________=
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi all,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">FWIW I concur with Ro=
n.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; Al=
exander.Vainshtein@ecitele.com<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;spring-bounces@ietf.org&gt;=
 <b>On Behalf Of
</b>Ron Bonica<br>
<b>Sent:</b> Thursday, October 17, 2019 7:02 PM<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;pcamaril@cisco.com&gt;; SPRING W=
G List &lt;spring@ietf.org&gt;; 6man &lt;6man@ietf.org&gt;<br>
<b>Subject:</b> [spring] Single Packet Contains Two Routing Headers (was: =
draft-ietf-spring-srv6-network-programming-04: Section 2)<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The two excerpts from RFC 8200, quoted below, shoul=
d be understood in the context of Postel&#8217;s Rule. That is, &#8220;be =
conservative in what you send and tolerant in what you receive&#8221;.<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">RFC 8200 says that a single packet should not inclu=
de two Routing headers. So, in keeping with the first part of Postel&#8217=
;s Rule, the IETF should never publish a specification that violates that =
rule, unless it updates or obsoletes RFC 8200.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">RFC 8200 also says that if an implementation receiv=
es a packet that includes two Routing headers, it should attempt to proces=
s it. This is in keeping with the second part of Postel&#8217;s Rule.<o:p>=
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Your statement in draft-ietf-spring-srv6-network-pr=
ogramming goes well beyond the second part of Postel&#8217;s rule. It does=
n&#8217;t say, &#8220;If a poorly behaved implementation sends you a packe=
t that includes two Routing headers, attempt to process
 them&#8221;. It says, &#8220;We assume that the SRH may be present multip=
le times inside each packet&#8221;.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">There is a big difference.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margi=
n-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</spa=
n><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;<a href=
=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 5:41 AM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net">rbonica@j=
uniper.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">=
spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming-04=
: Section 2<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Ron,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">The intent is to define SIDs a=
nd their processing as general as possible to accept whatever is received =
as per RFC8200. This is a reminder of that fact.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Cheers,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font=
-size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Ron Bonica &lt;<a =
href=3D"mailto:rbonica@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Date: </b>Wednesday, 16 October 2019 at 01:43<br>
<b>To: </b>&quot;Pablo Camarillo (pcamaril)&quot; &lt;<a href=3D"mailto:pc=
amaril@cisco.com">pcamaril@cisco.com</a>&gt;, SPRING WG List &lt;<a href=3D=
"mailto:spring@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Subject: </b>RE: [spring] draft-ietf-spring-srv6-network-programming-04=
: Section 2<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">I am sure that you hav=
e read RFC 8200 carefully enough to have noticed the following text:<o:p><=
/o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black">&#8220;Each =
extension header should occur at most once, except for the Destination Opt=
ions header, which should occur at most twice (once before a Routing heade=
r and once before the upper-layer header).</span><o:p></o:p></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">This rule addresses th=
e number of extension headers of any given type that can appear in a singl=
e packet. A packet that contains one IP header and two routing headers wou=
ld violate this rule.&nbsp;
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">You quote the followin=
g text, also from RFC 8200, omitting the final sentences:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<pre style=3D"margin-left:36.0pt"><span style=3D"font-family:&quot;Calibri=
&quot;,sans-serif">&#8220;</span><span style=3D"color:black">IPv6 nodes mu=
st accept and attempt to process extension headers in any order and occurr=
ing any number of times in the same packet, except for the Hop-by-Hop Opti=
ons header, which is restricted to appear immediately after an IPv6 header=
 only.&nbsp; Nonetheless, it is strongly advised that sources of IPv6 pack=
ets adhere to the above recommended order until and unless subsequent spec=
ifications revise</span><o:p></o:p></pre>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black">that recomme=
ndation.&#8221;</span><o:p></o:p></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Is it your intent to i=
gnore the strong advice of RFC 8200 without offering any justification?
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-a=
lt:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:36.0pt;margin-bottom=
:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</spa=
n><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b>From:</b> Pablo Cam=
arillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco=
.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 12:45 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net">rbonica@j=
uniper.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">=
spring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming-04=
: Section 2<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Ron,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">That sentence is there=
 on purpose. RFC8200:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fa=
mily:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; IPv6 nodes must acc=
ept and attempt to process extension headers in</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fa=
mily:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; any order and occur=
ring any number of times in the same packet</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">I will update that sen=
tence in the next revision of the draft to make it more formal and include=
 the normative reference:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&#8220;As per [RFC8200=
], multiple occurrences of the SRH might be present in the same IPv6 heade=
r.&#8221;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Cheers,<o:p></o:p></p>=

<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Pablo.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-GB">&=
nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-GB">&=
nbsp;</span><o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><b><span style=3D"font=
-size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">spring &lt;</span>=
<span lang=3D"ES"><a href=3D"mailto:spring-bounces@ietf.org"><span lang=3D=
"EN-US" style=3D"font-size:12.0pt">spring-bounces@ietf.org</span></a></spa=
n><span style=3D"font-size:12.0pt;color:black">&gt; on
 behalf of Ron Bonica &lt;</span><span lang=3D"ES"><a href=3D"mailto:rboni=
ca=3D40juniper.net@dmarc.ietf.org"><span lang=3D"EN-US" style=3D"font-size=
:12.0pt">rbonica=3D40juniper.net@dmarc.ietf.org</span></a></span><span sty=
le=3D"font-size:12.0pt;color:black">&gt;<br>
<b>Date: </b>Monday, 14 October 2019 at 20:28<br>
<b>To: </b>SPRING WG List &lt;</span><span lang=3D"ES"><a href=3D"mailto:s=
pring@ietf.org"><span lang=3D"EN-US" style=3D"font-size:12.0pt">spring@iet=
f.org</span></a></span><span style=3D"font-size:12.0pt;color:black">&gt;<b=
r>
<b>Subject: </b>[spring] draft-ietf-spring-srv6-network-programming-04: Se=
ction 2</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">Authors,<o:p></o:p></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">In Section 2 of draft-=
ietf-spring-srv6-network-programming-04, you say:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&#8220;SRH: Segment Ro=
uting Header as defined in&nbsp; [I-D.ietf-6man-segment-routing-header].&n=
bsp; We assume that the SRH may be present multiple times inside each pack=
et.&#8221;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">Did you mean to remove=
 the final sentence?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<span lang=3D"ES">Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"ES">&nbs=
p;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"ES">&nbs=
p;<o:p></o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-a=
lt:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:72.0pt;margin-bottom=
:.0001pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business U=
se Only</span><span lang=3D"ES"><o:p></o:p></span></p>
</div>
<br clear=3D"both">
__________________________________________________________________________=
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From: Ron Bonica <rbonica@juniper.net>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/5BcIJiIc0a2xRNY0UgeJVAP48II>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Content-Type: text/plain; charset="us-ascii"
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Pablo,

RFC 8200 strongly discourages us from removing the SRH. Therefore, lacking =
strong motivation, we should not do so.

We agree that the SRH with Segments Left equal to zero is a functional NOOP=
. So, there is no functional motivation. This leaves us to search for other=
 motivations. The following are possibilities:


  *   To conserve bandwidth on downstream links
  *   To make parsing possible on constrained downstream ASICs

Neither of these arguments are compelling, Is there another motivation that=
 I am missing?

                                                                           =
       Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
Sent: Thursday, October 17, 2019 5:41 AM
To: Ron Bonica <rbonica@juniper.net>; SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4=
.16

Hi Ron,

SRH with SL=3D0 is a functional NOOP but physically present. These flavors =
remove the physical instance.

Cheers,
Pablo.

From: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Date: Wednesday, 16 October 2019 at 02:43
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com<mailto:pcamaril@cisco.=
com>>, SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: RE: [spring] draft-ietf-spring-srv6-network-programming: Section 4=
.16

Pablo,

I have read all three of these responses, but remain unconvinced.

The PSP and USP flavors both remove an SRH when the value of Segments Left =
is equal to 0. They do not remove the IP header that is extended by the SRH=
.
The SRH that is removed is functionally an NOOP, because Segments Left is e=
qual to 0. So why bother to remove it?

                                                                           =
                 Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.=
com>>
Sent: Tuesday, October 15, 2019 12:45 PM
To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>; SPRING WG=
 List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4=
.16

Ron,

You have already asked that same question a few days ago with the same word=
s:
https://mailarchive.ietf.org/arch/msg/spring/4_Slu3kkHwduZZPFJJmRUkmoTVo<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/4_Slu=
3kkHwduZZPFJJmRUkmoTVo__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JD=
fQlJsrpWnQL9RJs3uNXDRTozcu0$>

and there have been replies to it detailing the use-cases:
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0Zpj=
VLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JD=
fQlJsrpWnQL9RJs3uNXDShyO5lJ$>
https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzR=
ZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JD=
fQlJsrpWnQL9RJs3uNXDeiyat5Q$>
https://mailarchive.ietf.org/arch/msg/spring/O7Bf7-UqDj4wDu76d3viV7pCSks<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/O7Bf7=
-UqDj4wDu76d3viV7pCSks__;!8WoA6RjC81c!QLco8bcrMNVz-BEUDaTnOAJzb008Hr4jPH9JD=
fQlJsrpWnQL9RJs3uNXDWG9L5Tl$>

I guess you might have missed them. Please read the replies.

Thanks,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Ron Bonica <rbonica=3D40juniper.net@dmarc.ietf.org<mailto:rbonica=
=3D40juniper.net@dmarc.ietf.org>>
Date: Monday, 14 October 2019 at 20:45
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16

Authors,

Lacking the B.INSERT and T.INSERT functions, can you describe a use-case fo=
r the PSP and USP flavors of the END, END.X and END.T functions?

                                              Ron



Juniper Business Use Only

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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">RFC 8200 strongly discourages us from removing the S=
RH. Therefore, lacking strong motivation, we should not do so.<o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">We agree that the SRH with Segments Left equal to ze=
ro is a functional NOOP. So, there is no functional motivation. This leaves=
 us to search for other motivations. The following are possibilities:<o:p><=
/o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l1 level1 =
lfo3">To conserve bandwidth on downstream links<o:p></o:p></li><li class=3D=
"MsoListParagraph" style=3D"margin-left:0in;mso-list:l1 level1 lfo3">To mak=
e parsing possible on constrained downstream ASICs<o:p></o:p></li></ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Neither of these arguments are compelling, Is there =
another motivation that I am missing?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;pcamaril=
@cisco.com&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 5:41 AM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;; SPRING WG List &lt;sprin=
g@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming: Se=
ction 4.16<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Hi Ron,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">SRH with SL=3D0 is a functional NOOP but physically =
present. These flavors remove the physical instance.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Cheers,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-si=
ze:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Ron Bonica &lt;<a h=
ref=3D"mailto:rbonica@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Date: </b>Wednesday, 16 October 2019 at 02:43<br>
<b>To: </b>&quot;Pablo Camarillo (pcamaril)&quot; &lt;<a href=3D"mailto:pca=
maril@cisco.com">pcamaril@cisco.com</a>&gt;, SPRING WG List &lt;<a href=3D"=
mailto:spring@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Subject: </b>RE: [spring] draft-ietf-spring-srv6-network-programming: Se=
ction 4.16<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">I have read all three of =
these responses, but remain unconvinced.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">The PSP and USP flavors b=
oth remove an SRH when the value of Segments Left is equal to 0. They do no=
t remove the IP header that is extended by the SRH.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">The SRH that is removed i=
s functionally an NOOP, because Segments Left is equal to 0. So why bother =
to remove it?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;Ron<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b>From:</b> Pablo Camari=
llo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com=
</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 12:45 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net">rbonica@ju=
niper.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">sp=
ring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming: Se=
ction 4.16<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"color:blac=
k">Ron,</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">You have already asked that same question a few=
 days ago with the same words:</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span lang=3D"ES"><a href=3D"https://urldefense.com/v3/__https:/mailarchive=
.ietf.org/arch/msg/spring/4_Slu3kkHwduZZPFJJmRUkmoTVo__;!8WoA6RjC81c!QLco8b=
crMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDRTozcu0$" title=3D"https=
://mailarchive.ietf.org/arch/msg/spring/4_Slu3kkHwduZZPFJJmRUkmoTVo"><span =
lang=3D"EN-US" style=3D"color:#954F72">https://mailarchive.ietf.org/arch/ms=
g/spring/4_Slu3kkHwduZZPFJJmRUkmoTVo</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">and there have been replies to it detailing the=
 use-cases:</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span lang=3D"ES"><a href=3D"https://urldefense.com/v3/__https:/mailarchive=
.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!QLco8b=
crMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDShyO5lJ$" title=3D"https=
://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c"><span =
lang=3D"EN-US" style=3D"color:#954F72">https://mailarchive.ietf.org/arch/ms=
g/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span lang=3D"ES"><a href=3D"https://urldefense.com/v3/__https:/mailarchive=
.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!QLco8b=
crMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDeiyat5Q$" title=3D"https=
://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak"><span =
lang=3D"EN-US" style=3D"color:#954F72">https://mailarchive.ietf.org/arch/ms=
g/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span lang=3D"ES"><a href=3D"https://urldefense.com/v3/__https:/mailarchive=
.ietf.org/arch/msg/spring/O7Bf7-UqDj4wDu76d3viV7pCSks__;!8WoA6RjC81c!QLco8b=
crMNVz-BEUDaTnOAJzb008Hr4jPH9JDfQlJsrpWnQL9RJs3uNXDWG9L5Tl$" title=3D"https=
://mailarchive.ietf.org/arch/msg/spring/O7Bf7-UqDj4wDu76d3viV7pCSks"><span =
lang=3D"EN-US" style=3D"color:#954F72">https://mailarchive.ietf.org/arch/ms=
g/spring/O7Bf7-UqDj4wDu76d3viV7pCSks</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">I guess you might have missed them. Please read=
 the replies.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">Thanks,</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;caret-color: rgb(0, 0, 0);=
font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webk=
it-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style=3D"color:black">Pablo.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-GB">&nbs=
p;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-GB">&nbs=
p;</span><o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><b><span style=3D"font-s=
ize:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">spring &lt;</span><=
span lang=3D"ES"><a href=3D"mailto:spring-bounces@ietf.org"><span lang=3D"E=
N-US" style=3D"font-size:12.0pt">spring-bounces@ietf.org</span></a></span><=
span style=3D"font-size:12.0pt;color:black">&gt; on
 behalf of Ron Bonica &lt;</span><span lang=3D"ES"><a href=3D"mailto:rbonic=
a=3D40juniper.net@dmarc.ietf.org"><span lang=3D"EN-US" style=3D"font-size:1=
2.0pt">rbonica=3D40juniper.net@dmarc.ietf.org</span></a></span><span style=
=3D"font-size:12.0pt;color:black">&gt;<br>
<b>Date: </b>Monday, 14 October 2019 at 20:45<br>
<b>To: </b>SPRING WG List &lt;</span><span lang=3D"ES"><a href=3D"mailto:sp=
ring@ietf.org"><span lang=3D"EN-US" style=3D"font-size:12.0pt">spring@ietf.=
org</span></a></span><span style=3D"font-size:12.0pt;color:black">&gt;<br>
<b>Subject: </b>[spring] draft-ietf-spring-srv6-network-programming: Sectio=
n 4.16</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Lacking the B.INSERT and=
 T.INSERT functions, can you describe a use-case for the PSP and USP flavor=
s of the END, END.X and END.T functions?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
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sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;
<span lang=3D"ES">Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><span lang=3D"ES">&nbsp;=
<o:p></o:p></span></p>
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001pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
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From: Ron Bonica <rbonica@juniper.net>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2
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Date: Thu, 17 Oct 2019 21:32:45 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/kV5gJtCwCgUgAoSMx3ha0rWa6vs>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4.16.2
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Pablo,

I see your point. An RFC 4291-style IPv6 address can replace END with USD, =
but it can't replaced END.X with USD.

                                                            Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
Sent: Thursday, October 17, 2019 5:45 AM
To: Ron Bonica <rbonica@juniper.net>; SPRING WG List <spring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4=
.16.2

Hi Ron,

Are you sure you get the same behavior with an interface address?

Can you please explain me how do you decapsulate and forward the inner -enc=
apsulated- IPv6 packet on a link with a high IGP metric when the packet arr=
ives with a DA=3DIPv6 interface address?

Thanks,
Pablo.

From: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Date: Wednesday, 16 October 2019 at 01:59
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com<mailto:pcamaril@cisco.=
com>>, SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: RE: [spring] draft-ietf-spring-srv6-network-programming :Section 4=
.16.2

Pablo,

You haven't answered my question.

Why specify a USD flavor of END, END.X and END.T when you can get the exact=
 same behavior by populating SID[0] with an IPv6 address that identifies a =
real interface?

USD seems redundant.

                                        Ron




Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.=
com>>
Sent: Tuesday, October 15, 2019 12:45 PM
To: Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>; SPRING WG=
 List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4=
.16.2

Ron,

The USD flavour is used in any T.Encaps policy applied within the SR domain=
.

Cheers,
Pablo.

From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Ron Bonica <rbonica=3D40juniper.net@dmarc.ietf.org<mailto:rbonica=
=3D40juniper.net@dmarc.ietf.org>>
Date: Tuesday, 15 October 2019 at 01:03
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming :Section 4=
.16.2

Authors,

Sorry, I meant to say USD, not USP.

                         Ron




Juniper Business Use Only
From: Ron Bonica
Sent: Monday, October 14, 2019 2:36 PM
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Subject: draft-ietf-spring-srv6-network-programming :Section 4.16.2

Authors,

The USP flavor of the END, END.X and END.T functions isn't needed.

USP is the default IPv6 behavior. So, if the source node specifies SID[0] a=
s an RFC 4291 address on the SR egress node, you get the USP behavior for f=
ree.

                                                           Ron



Juniper Business Use Only

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<p class=3D"MsoNormal">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I see your point. An RFC 4291-style IPv6 address can=
 replace END with USD, but it can&#8217;t replaced END.X with USD.<o:p></o:=
p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;pcamaril=
@cisco.com&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 5:45 AM<br>
<b>To:</b> Ron Bonica &lt;rbonica@juniper.net&gt;; SPRING WG List &lt;sprin=
g@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Hi Ron,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Are you sure you get the same b=
ehavior with an interface address?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Can you please explain me how d=
o you decapsulate and forward the inner -encapsulated- IPv6 packet on a lin=
k with a high IGP metric when the packet arrives with a DA=3DIPv6 interface=
 address?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-si=
ze:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Ron Bonica &lt;<a h=
ref=3D"mailto:rbonica@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Date: </b>Wednesday, 16 October 2019 at 01:59<br>
<b>To: </b>&quot;Pablo Camarillo (pcamaril)&quot; &lt;<a href=3D"mailto:pca=
maril@cisco.com">pcamaril@cisco.com</a>&gt;, SPRING WG List &lt;<a href=3D"=
mailto:spring@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Subject: </b>RE: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">You haven&#8217;t answere=
d my question. <o:p>
</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Why specify a USD flavor =
of END, END.X and END.T when you can get the exact same behavior by populat=
ing SID[0] with an IPv6 address that identifies a real interface?<o:p></o:p=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">USD seems redundant.<o:p>=
</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b>From:</b> Pablo Camari=
llo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com=
</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 12:45 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net">rbonica@ju=
niper.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">sp=
ring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-GB">Ron,=
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-GB">&nbs=
p;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-GB">The =
USD flavour is used in any T.Encaps policy applied within the SR domain.</s=
pan><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-GB">&nbs=
p;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-GB">Chee=
rs,</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-GB">Pabl=
o.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"EN-GB">&nbs=
p;</span><o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><b><span style=3D"font-s=
ize:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">spring &lt;</span><=
span lang=3D"ES"><a href=3D"mailto:spring-bounces@ietf.org"><span lang=3D"E=
N-US" style=3D"font-size:12.0pt">spring-bounces@ietf.org</span></a></span><=
span style=3D"font-size:12.0pt;color:black">&gt; on
 behalf of Ron Bonica &lt;</span><span lang=3D"ES"><a href=3D"mailto:rbonic=
a=3D40juniper.net@dmarc.ietf.org"><span lang=3D"EN-US" style=3D"font-size:1=
2.0pt">rbonica=3D40juniper.net@dmarc.ietf.org</span></a></span><span style=
=3D"font-size:12.0pt;color:black">&gt;<br>
<b>Date: </b>Tuesday, 15 October 2019 at 01:03<br>
<b>To: </b>SPRING WG List &lt;</span><span lang=3D"ES"><a href=3D"mailto:sp=
ring@ietf.org"><span lang=3D"EN-US" style=3D"font-size:12.0pt">spring@ietf.=
org</span></a></span><span style=3D"font-size:12.0pt;color:black">&gt;<br>
<b>Subject: </b>Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Sorry, I meant to say US=
D, not USP.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:1.0in;margin-bottom:.0=
001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><b>From:</b> Ron Bonica =
<br>
<b>Sent:</b> Monday, October 14, 2019 2:36 PM<br>
<b>To:</b> SPRING WG List &lt;<span lang=3D"ES"><a href=3D"mailto:spring@ie=
tf.org"><span lang=3D"EN-US">spring@ietf.org</span></a></span>&gt;<br>
<b>Subject:</b> draft-ietf-spring-srv6-network-programming :Section 4.16.2<=
o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Authors,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">The USP flavor of the EN=
D, END.X and END.T functions isn&#8217;t needed.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">USP is the default IPv6 =
behavior. So, if the source node specifies SID[0] as an RFC 4291 address on=
 the SR egress node, you get the USP behavior for free.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;
<span lang=3D"ES">Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><span lang=3D"ES">&nbsp;=
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><span lang=3D"ES">&nbsp;=
<o:p></o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:1.0in;margin-bottom:.0=
001pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
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From: Ron Bonica <rbonica@juniper.net>
To: SPRING WG List <spring@ietf.org>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
Thread-Topic: More USP questions
Thread-Index: AdWFMnkjQP0E2HT6Sn+suGUPcTlGag==
Content-Class: 
Date: Thu, 17 Oct 2019 21:36:35 +0000
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Pablo,

According to Section 4.16.3, when a END SID with USD is decapsulated, the p=
ayload MUST be IPv6. Any other payload will be discarded.

Did you really mean to say that?

                                                     Ron



Juniper Business Use Only

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<p class=3D"MsoNormal">Pablo,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">According to Section 4.16.3, when a END SID with USD=
 is decapsulated, the payload MUST be IPv6. Any other payload will be disca=
rded.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did you really mean to say that?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
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p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<br>
<p class=3D"msipfooter30b3d538" align=3D"Center" style=3D"margin:0"><span s=
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From: Rajesh M <mrajesh@juniper.net>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>
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WANG had given below use case : But using existing PSP logic this will not =
work.
In below at PSP router updated SL will be 1 (since END.DT4 is still there) =
,so SRH pop won't happen.



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }

WANG use case:
"For example in SRv6-based L3VPN service scenario, The ingress PE within SR=
v6-enabled domain can utilize SR-TE policy to enable TE-path function when =
encapsulating and transiting L3VPN traffic, The Ingress PE push on customer=
 packets with SID list representing SR-TE policy plus END.DT4 as last SRv6 =
SID in SRH; So I think, each flavor of PSP/USP/USD can be designed to perfo=
rm in related SRv6 endpoint. Imaging the PSP, the penultimate Endpoint can =
perform PSP, e.g. copy the last SID (END.DT4) of SRH to destination field o=
f IPv6 header and POP the SRH, then forwarding it toward egress PE identifi=
ed by DA"







Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
Sent: Tuesday, October 15, 2019 10:13 PM
To: Rajesh M <mrajesh@juniper.net>; SPRING WG List <spring@ietf.org>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

Rajesh,

This has already been replied less than one week ago. Please see:
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0Zpj=
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W3khd_OAByxCvaxs9Jw7HGIr9o9$>
https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzR=
ZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7P8QaU_7$>

Thanks,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D=
40juniper.net@dmarc.ietf.org>>
Date: Friday, 11 October 2019 at 03:47
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>, Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-networ=
k-programming-04#page-24


Wanted to know the use case where we only POP the SRH ?

4.16.1<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-sp=
ring-srv6-network-programming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31=
cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$>.  PSP: Penultimate=
 Segment Pop of the SRH

   The SRH processing of the End, End.X and End.T behaviors are

   modified: after the instruction "S14.  Update IPv6 DA with Segment

   List[Segments Left]" is executed, the following instructions must be

   executed as well:



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }



Juniper Business Use Only

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<div class=3D"WordSection1">
<p class=3D"MsoNormal">WANG had given below use case : But using existing P=
SP logic this will not work.<o:p></o:p></p>
<p class=3D"MsoNormal">In below at PSP router updated SL will be 1 (since E=
ND.DT4 is still there) ,so SRH pop won&#8217;t happen.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">WANG use case:<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white">&#8220;For example in SRv6-based L3VPN service=
 scenario, The ingress PE within SRv6-enabled domain can utilize SR-TE poli=
cy to enable TE-path function when encapsulating
 and transiting L3VPN traffic, The Ingress PE push on customer packets with=
 SID list representing SR-TE policy plus END.DT4 as last SRv6 SID in SRH; S=
o I think, each flavor of PSP/USP/USD can be designed to perform in related=
 SRv6 endpoint. Imaging the PSP,
 the penultimate Endpoint can perform PSP, e.g. copy the last SID (END.DT4)=
 of SRH to destination field of IPv6 header and POP the SRH, then forwardin=
g it toward egress PE identified by DA&#8221;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;pcamaril=
@cisco.com&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 10:13 PM<br>
<b>To:</b> Rajesh M &lt;mrajesh@juniper.net&gt;; SPRING WG List &lt;spring@=
ietf.org&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;<br>
<b>Subject:</b> Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-=
srv6-network-programming-04#page-24<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Rajesh,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This has already been replied less than one week ago=
. Please see:
<o:p></o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://urldefense.com/v3/__https:/mailar=
chive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W=
8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7HGIr9o9$">https://m=
ailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c</a><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES"><a href=3D"https://urldefense.com/=
v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfa=
k__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P=
8QaU_7$"><span lang=3D"EN-US">https://mailarchive.ietf.org/arch/msg/spring/=
WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span lang=3D"ES" styl=
e=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Friday, 11 October 2019 at 03:47<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc: </b>Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;, Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject: </b>[spring] <a href=3D"https://tools.ietf.org/html/draft-ietf-=
spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">Wanted to know the use ca=
se where we only POP the SRH ?<o:p></o:p></span></pre>
<h4 style=3D"margin-left:.5in"><span lang=3D"ES"><a href=3D"https://urldefe=
nse.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-prog=
ramming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIh=
uJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$">4.16.1</a></span><a name=3D"section-4.16=
.1"></a><span lang=3D"ES" style=3D"font-family:&quot;Courier New&quot;">.&n=
bsp;
 PSP: Penultimate Segment Pop of the SRH</span><span lang=3D"ES"><o:p></o:p=
></span></h4>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; The SRH proc=
essing of the End, End.X and End.T behaviors are<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; modified: af=
ter the instruction &quot;S14.&nbsp; Update IPv6 DA with Segment<o:p></o:p>=
</span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; List[Segment=
s Left]&quot; is executed, the following instructions must be<o:p></o:p></s=
pan></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; executed as =
well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<o:p></o:p></span><=
/pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
</div>
</body>
</html>

--_000_MN2PR05MB6080AF7CB8230A9F403F7C89BE6D0MN2PR05MB6080namp_--


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> On Oct 17, 2019, at 5:30 AM, Lizhenbin <lizhenbin@huawei.com> wrote:
>=20
> In the past two years, China pushed the IPv6 deployment and almost all =
the IP networks of operators achieve the goal "IPv6 Ready". This provide =
a strong base for SRv6 deployments which can help operators provide new =
services based on IPv6 infrastructure.

With respect, I would suggest that before we push for SRv6 deployment, =
we develop and SRv6 use case that IPv6 doesn't support. My perception is =
that SRv6 is a solution looking for a problem.=


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To: Fred Baker <fredbaker.ietf@gmail.com>
Cc: Lizhenbin <lizhenbin@huawei.com>, "spring@ietf.org" <spring@ietf.org>,  "ipv6@ietf.org" <ipv6@ietf.org>, "v6ops@ietf.org" <v6ops@ietf.org>, Clarence Filsfils <cfilsfil@cisco.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/kXqlZSfvettDYIpmxPwHJ6AnE5A>
Subject: Re: [spring] New Version Notification for draft-matsushima-spring-srv6-deployment-status-02.txt
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Fred,

SRv6 is the solution to build networks and provide its services under
the segment routing architecture in case of IPv6 dataplane.

Sent from my iPhone

2019/10/18 8:52=E3=80=81Fred Baker <fredbaker.ietf@gmail.com>=E3=81=AE=E3=
=83=A1=E3=83=BC=E3=83=AB:

>
>
>> On Oct 17, 2019, at 5:30 AM, Lizhenbin <lizhenbin@huawei.com> wrote:
>>
>> In the past two years, China pushed the IPv6 deployment and almost all t=
he IP networks of operators achieve the goal "IPv6 Ready". This provide a s=
trong base for SRv6 deployments which can help operators provide new servic=
es based on IPv6 infrastructure.
>
> With respect, I would suggest that before we push for SRv6 deployment, we=
 develop and SRv6 use case that IPv6 doesn't support. My perception is that=
 SRv6 is a solution looking for a problem.


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<body lang=3D"ZH-CN" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">I th=
ink also including END.T which will select specific FIB,&nbsp; and &nbsp;th=
e 4291-style IPv6 address may be in last SID entry in Last SRH of Packet, o=
ther SID may not be rfc429-style IPv6@;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;spring-bounces@ietf.org&gt;
<b>On Behalf Of </b>Ron Bonica<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=
=BA=DA&quot;,sans-serif">=C4=EA</span><span lang=3D"EN-US">10</span><span s=
tyle=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=D4=C2=
</span><span lang=3D"EN-US">18</span><span style=3D"font-family:&quot;=CE=
=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C8=D5</span><span lang=3D"EN-US"> =
5:33<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;pcamaril@cisco.com&gt;; SPRING WG=
 List &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Pablo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I see your point. An RFC 4291-s=
tyle IPv6 address can replace END with USD, but it can=A1=AFt replaced END.=
X with USD.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco=
.com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 5:45 AM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net">rbonica@ju=
niper.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">sp=
ring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Hi Ron,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Are you sure you get the same b=
ehavior with an interface address?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Can you please explain me how d=
o you decapsulate and forward the inner -encapsulated- IPv6 packet on a lin=
k with a high IGP metric when the packet arrives with a DA=3DIPv6 interface=
 address?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span lang=3D"EN-US"=
 style=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"EN-US" style=3D"font-size:12.0pt;color:black">Ron =
Bonica &lt;<a href=3D"mailto:rbonica@juniper.net">rbonica@juniper.net</a>&g=
t;<br>
<b>Date: </b>Wednesday, 16 October 2019 at 01:59<br>
<b>To: </b>&quot;Pablo Camarillo (pcamaril)&quot; &lt;<a href=3D"mailto:pca=
maril@cisco.com">pcamaril@cisco.com</a>&gt;, SPRING WG List &lt;<a href=3D"=
mailto:spring@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Subject: </b>RE: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">Pa=
blo,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">Yo=
u haven=A1=AFt answered my question.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">Wh=
y specify a USD flavor of END, END.X and END.T when you can get the exact s=
ame behavior by populating SID[0] with an IPv6 address that identifies a re=
al interface?<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">US=
D seems redundant.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:36.0pt;margin-bottom:.=
0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span lang=3D"EN-US"=
>From:</span></b><span lang=3D"EN-US"> Pablo Camarillo (pcamaril) &lt;<a hr=
ef=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 12:45 PM<br>
<b>To:</b> Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net">rbonica@ju=
niper.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">sp=
ring@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-GB">Ro=
n,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-GB">&n=
bsp;</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-GB">Th=
e USD flavour is used in any T.Encaps policy applied within the SR domain.<=
/span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-GB">&n=
bsp;</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-GB">Ch=
eers,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-GB">Pa=
blo.</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-GB">&n=
bsp;</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><b><span lang=3D"EN-US"=
 style=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"EN-US" style=3D"font-size:12.0pt;color:black">spri=
ng &lt;</span><span lang=3D"ES"><a href=3D"mailto:spring-bounces@ietf.org">=
<span lang=3D"EN-US" style=3D"font-size:12.0pt">spring-bounces@ietf.org</sp=
an></a></span><span lang=3D"EN-US" style=3D"font-size:12.0pt;color:black">&=
gt;
 on behalf of Ron Bonica &lt;</span><span lang=3D"ES"><a href=3D"mailto:rbo=
nica=3D40juniper.net@dmarc.ietf.org"><span lang=3D"EN-US" style=3D"font-siz=
e:12.0pt">rbonica=3D40juniper.net@dmarc.ietf.org</span></a></span><span lan=
g=3D"EN-US" style=3D"font-size:12.0pt;color:black">&gt;<br>
<b>Date: </b>Tuesday, 15 October 2019 at 01:03<br>
<b>To: </b>SPRING WG List &lt;</span><span lang=3D"ES"><a href=3D"mailto:sp=
ring@ietf.org"><span lang=3D"EN-US" style=3D"font-size:12.0pt">spring@ietf.=
org</span></a></span><span lang=3D"EN-US" style=3D"font-size:12.0pt;color:b=
lack">&gt;<br>
<b>Subject: </b>Re: [spring] draft-ietf-spring-srv6-network-programming :Se=
ction 4.16.2</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">Au=
thors,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">So=
rry, I meant to say USD, not USP.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ro=
n<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:72.0pt;margin-bottom:.=
0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><b><span lang=3D"EN-US"=
>From:</span></b><span lang=3D"EN-US"> Ron Bonica
<br>
<b>Sent:</b> Monday, October 14, 2019 2:36 PM<br>
<b>To:</b> SPRING WG List &lt;</span><span lang=3D"ES"><a href=3D"mailto:sp=
ring@ietf.org"><span lang=3D"EN-US">spring@ietf.org</span></a></span><span =
lang=3D"EN-US">&gt;<br>
<b>Subject:</b> draft-ietf-spring-srv6-network-programming :Section 4.16.2<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">Au=
thors,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">Th=
e USP flavor of the END, END.X and END.T functions isn=A1=AFt needed.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">US=
P is the default IPv6 behavior. So, if the source node specifies SID[0] as =
an RFC 4291 address on the SR egress node, you get the USP behavior for fre=
e.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"EN-US">&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span lang=3D"ES">Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"ES">&nbsp=
;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span lang=3D"ES">&nbsp=
;<o:p></o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:72.0pt;margin-bottom:.=
0001pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
</div>
</body>
</html>

--_000_a94b8accaf4941b18a278d656415447fnokiasbellcom_--


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From: Hirofumi Ichihara <ichihara.hirofumi@gmail.com>
Date: Fri, 18 Oct 2019 10:29:22 +0900
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Cc: "spring@ietf.org" <spring@ietf.org>, "ipv6@ietf.org" <ipv6@ietf.org>,  Clarence Filsfils <cfilsfil@cisco.com>, Satoru Matsushima <satoru.matsushima@g.softbank.co.jp>
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Content-Type: text/plain; charset="UTF-8"
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Hi,

Let me introduce LINE's SRv6 DC use case as well. We have already deployed
SRv6 network with our private cloud on production environment. Please have
a look at this slide(
https://speakerdeck.com/line_developers/line-data-center-networking-with-sr=
v6 )
if you're interested in our use case. And also we're interested in other DC
use cases and implementations. Please let me know if you have such
information.

Thanks,
Hirofumi


2019=E5=B9=B410=E6=9C=8817=E6=97=A5(=E6=9C=A8) 21:31 Lizhenbin <lizhenbin@h=
uawei.com>:

> Hi Folks,
> We updated the SRv6 deployment draft as follows. There are two new
> deployments of SRv6 from China for reference:
> China Unicom and CERNET2. In the past two years, China pushed the IPv6
> deployment and almost all the IP networks
> of operators achieve the goal "IPv6 Ready". This provide a strong base fo=
r
> SRv6 deployments which can help operators
> provide new services based on IPv6 infrastructure. Moreover the easy
> incremental deployment advantage of SRv6 (refer
> to https://tools.ietf.org/html/draft-xie-spring-srv6-network-migration-00
> ) facilitates the SRv6 deployments in the existing
> network. Besides the SRv6 deployments proposed in the draft, there will b=
e
> more SRv6 for different application scenariosin
> the near future. These SRv6 deployments  are also promoting the IPv6
> deployment and more IPv6 traffic will be beared by
> these networks.
>
>
>
> Best Regards,
> Robin
>
>
>
> ________________________________________
> =E5=8F=91=E4=BB=B6=E4=BA=BA: internet-drafts@ietf.org [internet-drafts@ie=
tf.org]
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=A5=
 11:15
> =E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence Filsfils; Lizhenbin; Sat=
oru Matsushima
> =E4=B8=BB=E9=A2=98: New Version Notification for
> draft-matsushima-spring-srv6-deployment-status-02.txt
>
> A new version of I-D, draft-matsushima-spring-srv6-deployment-status-02.t=
xt
> has been successfully submitted by Zafar Ali and posted to the
> IETF repository.
>
> Name:           draft-matsushima-spring-srv6-deployment-status
> Revision:       02
> Title:          SRv6 Implementation and Deployment Status
> Document date:  2019-10-14
> Group:          Individual Submission
> Pages:          19
> URL:
> https://www.ietf.org/internet-drafts/draft-matsushima-spring-srv6-deploym=
ent-status-02.txt
> Status:
> https://datatracker.ietf.org/doc/draft-matsushima-spring-srv6-deployment-=
status/
> Htmlized:
> https://tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-statu=
s-02
> Htmlized:
> https://datatracker.ietf.org/doc/html/draft-matsushima-spring-srv6-deploy=
ment-status
> Diff:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-matsushima-spring-srv6-deployme=
nt-status-02
>
> Abstract:
>    This draft provides an overview of IPv6 Segment Routing (SRv6)
>    deployment status.  It lists various SRv6 features that have been
>    deployed in the production networks.  It also provides an overview of
>    SRv6 implementation and interoperability testing status.
>
>
>
>
>
> Please note that it may take a couple of minutes from the time of
> submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> The IETF Secretariat
> --------------------------------------------------------------------
> IETF IPv6 working group mailing list
> ipv6@ietf.org
> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> --------------------------------------------------------------------
>

--00000000000026099905952544c8
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr">Hi,<div><br></div><div>Let me introduce L=
INE&#39;s SRv6 DC use case as well. We have already deployed SRv6 network w=
ith our private cloud on production environment. Please have a look at this=
 slide( <a href=3D"https://speakerdeck.com/line_developers/line-data-center=
-networking-with-srv6">https://speakerdeck.com/line_developers/line-data-ce=
nter-networking-with-srv6</a>=C2=A0) if you&#39;re interested in our use ca=
se. And also we&#39;re interested in other DC use cases and implementations=
. Please let me know if you have such information.</div><div><br></div><div=
>Thanks,</div><div>Hirofumi</div><div><br></div></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">2019=E5=B9=B410=E6=
=9C=8817=E6=97=A5(=E6=9C=A8) 21:31 Lizhenbin &lt;<a href=3D"mailto:lizhenbi=
n@huawei.com">lizhenbin@huawei.com</a>&gt;:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-=
left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">Hi Fo=
lks,<br>
We updated the SRv6 deployment draft as follows. There are two new deployme=
nts of SRv6 from China for reference: <br>
China Unicom and CERNET2. In the past two years, China pushed the IPv6 depl=
oyment and almost all the IP networks <br>
of operators achieve the goal &quot;IPv6 Ready&quot;. This provide a strong=
 base for SRv6 deployments which can help operators <br>
provide new services based on IPv6 infrastructure. Moreover the easy increm=
ental deployment advantage of SRv6 (refer <br>
to <a href=3D"https://tools.ietf.org/html/draft-xie-spring-srv6-network-mig=
ration-00" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html=
/draft-xie-spring-srv6-network-migration-00</a> ) facilitates the SRv6 depl=
oyments in the existing <br>
network. Besides the SRv6 deployments proposed in the draft, there will be =
more SRv6 for different application scenariosin <br>
the near future. These SRv6 deployments=C2=A0 are also promoting the IPv6 d=
eployment and more IPv6 traffic will be beared by <br>
these networks.=C2=A0 <br>
<br>
<br>
<br>
Best Regards,<br>
Robin<br>
<br>
<br>
<br>
________________________________________<br>
=E5=8F=91=E4=BB=B6=E4=BA=BA: <a href=3D"mailto:internet-drafts@ietf.org" ta=
rget=3D"_blank">internet-drafts@ietf.org</a> [<a href=3D"mailto:internet-dr=
afts@ietf.org" target=3D"_blank">internet-drafts@ietf.org</a>]<br>
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=A5 1=
1:15<br>
=E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence Filsfils; Lizhenbin; Sator=
u Matsushima<br>
=E4=B8=BB=E9=A2=98: New Version Notification for draft-matsushima-spring-sr=
v6-deployment-status-02.txt<br>
<br>
A new version of I-D, draft-matsushima-spring-srv6-deployment-status-02.txt=
<br>
has been successfully submitted by Zafar Ali and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-matsushima-spring-srv6-=
deployment-status<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A002<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 SRv6 Implementation and Deployment=
 Status<br>
Document date:=C2=A0 2019-10-14<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 19<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-matsushima-spring-srv6-deployment-status-02.txt" r=
el=3D"noreferrer" target=3D"_blank">https://www.ietf.org/internet-drafts/dr=
aft-matsushima-spring-srv6-deployment-status-02.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-matsushima-spring-srv6-deployment-status/" rel=3D"noreferre=
r" target=3D"_blank">https://datatracker.ietf.org/doc/draft-matsushima-spri=
ng-srv6-deployment-status/</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-matsushima-spring-srv6-deployment-status-02" rel=3D"noreferrer" targe=
t=3D"_blank">https://tools.ietf.org/html/draft-matsushima-spring-srv6-deplo=
yment-status-02</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org=
/doc/html/draft-matsushima-spring-srv6-deployment-status" rel=3D"noreferrer=
" target=3D"_blank">https://datatracker.ietf.org/doc/html/draft-matsushima-=
spring-srv6-deployment-status</a><br>
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.o=
rg/rfcdiff?url2=3Ddraft-matsushima-spring-srv6-deployment-status-02" rel=3D=
"noreferrer" target=3D"_blank">https://www.ietf.org/rfcdiff?url2=3Ddraft-ma=
tsushima-spring-srv6-deployment-status-02</a><br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This draft provides an overview of IPv6 Segment Routing (SRv6)=
<br>
=C2=A0 =C2=A0deployment status.=C2=A0 It lists various SRv6 features that h=
ave been<br>
=C2=A0 =C2=A0deployed in the production networks.=C2=A0 It also provides an=
 overview of<br>
=C2=A0 =C2=A0SRv6 implementation and interoperability testing status.<br>
<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
The IETF Secretariat<br>
--------------------------------------------------------------------<br>
IETF IPv6 working group mailing list<br>
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From: Rajesh M <mrajesh@juniper.net>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, SPRING WG List <spring@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "Patrice Brissette (pbrisset)" <pbrisset@cisco.com>, "Swadesh Agrawal (swaagraw)" <swaagraw@cisco.com>, Peter Psenak <ppsenak@cisco.com>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>
Thread-Topic: https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02
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Subject: Re: [spring] https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02
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Hi Ketan/Peter,

I am assuming this is true even in below case
"SRv6-Service-SID (END.DT4 SID)is derived from a locator corresponding to f=
lex algorithm ? "

Thanks
Rajesh




Juniper Business Use Only
From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Thursday, October 17, 2019 6:27 PM
To: Rajesh M <mrajesh@juniper.net>; SPRING WG List <spring@ietf.org>; Clare=
nce Filsfils (cfilsfil) <cfilsfil@cisco.com>; Patrice Brissette (pbrisset) =
<pbrisset@cisco.com>; Swadesh Agrawal (swaagraw) <swaagraw@cisco.com>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>
Subject: RE: https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02

Hi Rajesh,

You are correct.

Thanks,
Ketan

From: spring <spring-bounces@ietf.org> On Behalf Of Rajesh M
Sent: 17 October 2019 17:58
To: SPRING WG List <spring@ietf.org>; Clarence Filsfils (cfilsfil) <cfilsfi=
l@cisco.com>; Patrice Brissette (pbrisset) <pbrisset@cisco.com>; Swadesh Ag=
rawal (swaagraw) <swaagraw@cisco.com>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>
Subject: Re: [spring] https://tools.ietf.org/html/draft-dawra-bess-srv6-ser=
vices-02

Authors of the draft could you please respond ?




Juniper Business Use Only
From: Rajesh M
Sent: Friday, October 11, 2019 7:00 AM
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02<http=
s://urldefense.com/v3/__https:/tools.ietf.org/html/draft-dawra-bess-srv6-se=
rvices-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1wjCRKLg4MMbWlArh2rC0Srmtc6uKxdGYo=
SjuGxkKh-cx1pT$>

Section3:
However, when the received route is colored with an extended color
   community 'C' and Next-Hop 'N', and the ingress PE has a valid SRv6
   Policy (C, N) associated with SID list <S1,S2, S3> [I-D.filsfils-
   spring-segment-routing-policy], then the effective SR Policy is <S1,
   S2, S3, SRv6-Service-SID>.


When we make effective SR policy cant we remove S3 from List (S3 and SRv6-S=
ervice-SID both belong to Egress).
effective SR Policy can be <S1,S2, SRv6-Service-SID>.





Juniper Business Use Only

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<p class=3D"MsoNormal">Hi Ketan/Peter,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I am assuming this is true even in below case <o:p><=
/o:p></p>
<p class=3D"MsoNormal"><b><span style=3D"color:red">&#8220;</span></b><b><s=
pan style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:red=
">SRv6-Service-SID (END.DT4 SID)is derived from a locator corresponding to =
flex algorithm ? &#8221;<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">Thanks<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">Rajesh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
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<p class=3D"MsoNormal"><b>From:</b> Ketan Talaulikar (ketant) &lt;ketant@ci=
sco.com&gt; <br>
<b>Sent:</b> Thursday, October 17, 2019 6:27 PM<br>
<b>To:</b> Rajesh M &lt;mrajesh@juniper.net&gt;; SPRING WG List &lt;spring@=
ietf.org&gt;; Clarence Filsfils (cfilsfil) &lt;cfilsfil@cisco.com&gt;; Patr=
ice Brissette (pbrisset) &lt;pbrisset@cisco.com&gt;; Swadesh Agrawal (swaag=
raw) &lt;swaagraw@cisco.com&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;<br>
<b>Subject:</b> RE: https://tools.ietf.org/html/draft-dawra-bess-srv6-servi=
ces-02<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN">Hi Rajesh,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-IN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN">You are correct.<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN">Ketan<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;spring-bounces@ietf.org&gt; =
<b>On Behalf Of
</b>Rajesh M<br>
<b>Sent:</b> 17 October 2019 17:58<br>
<b>To:</b> SPRING WG List &lt;spring@ietf.org&gt;; Clarence Filsfils (cfils=
fil) &lt;cfilsfil@cisco.com&gt;; Patrice Brissette (pbrisset) &lt;pbrisset@=
cisco.com&gt;; Swadesh Agrawal (swaagraw) &lt;swaagraw@cisco.com&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;<br>
<b>Subject:</b> Re: [spring] https://tools.ietf.org/html/draft-dawra-bess-s=
rv6-services-02<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-IN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">Authors of the draft could you please respond ?<o:p>=
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Rajesh M <br>
<b>Sent:</b> Friday, October 11, 2019 7:00 AM<br>
<b>To:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> <a href=3D"https://urldefense.com/v3/__https:/tools.ietf.or=
g/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1wj=
CRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$">
https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02</a><o:p></o:p=
></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">Section3:&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">However, when the received route is colored with an extend=
ed color<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; community 'C' and Next-Hop 'N', and the ingre=
ss PE has a valid SRv6<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; Policy (C, N) associated with SID list &lt;S1=
,S2, S3&gt; [I-D.filsfils-<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; spring-segment-routing-policy], then the effe=
ctive SR Policy is &lt;S1,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; S2, S3, SRv6-Service-SID&gt;.<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">When we make effective SR policy cant we remove S3 from=
 List (S3 and SRv6-Service-SID both belong to Egress).<o:p></o:p></span></b=
></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">effective SR Policy can be &lt;S1,S2, SRv6-Service-SID&=
gt;.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
</div>
</body>
</html>

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From: Rajesh M <mrajesh@juniper.net>
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>, draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>, Ron Bonica <rbonica@juniper.net>
Thread-Topic: https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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Date: Fri, 18 Oct 2019 01:55:22 +0000
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Rajesh M <mrajesh@juniper.net>, SPRING WG List <spring@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "Patrice Brissette (pbrisset)" <pbrisset@cisco.com>, "Swadesh Agrawal (swaagraw)" <swaagraw@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>
Thread-Topic: https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/jLY2EdSYVX87JNcTxzIjUl6BSgw>
Subject: Re: [spring] https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02
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Hi Rajesh,

That is correct.

Thanks,
Ketan

From: Rajesh M <mrajesh@juniper.net>
Sent: 18 October 2019 07:23
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; SPRING WG List <spring@ie=
tf.org>; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com>; Patrice Brisset=
te (pbrisset) <pbrisset@cisco.com>; Swadesh Agrawal (swaagraw) <swaagraw@ci=
sco.com>; Peter Psenak (ppsenak) <ppsenak@cisco.com>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>
Subject: RE: https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02

Hi Ketan/Peter,

I am assuming this is true even in below case
"SRv6-Service-SID (END.DT4 SID)is derived from a locator corresponding to f=
lex algorithm ? "

Thanks
Rajesh




Juniper Business Use Only
From: Ketan Talaulikar (ketant) <ketant@cisco.com<mailto:ketant@cisco.com>>
Sent: Thursday, October 17, 2019 6:27 PM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; SPRING WG L=
ist <spring@ietf.org<mailto:spring@ietf.org>>; Clarence Filsfils (cfilsfil)=
 <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; Patrice Brissette (pbriss=
et) <pbrisset@cisco.com<mailto:pbrisset@cisco.com>>; Swadesh Agrawal (swaag=
raw) <swaagraw@cisco.com<mailto:swaagraw@cisco.com>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02

Hi Rajesh,

You are correct.

Thanks,
Ketan

From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Rajesh M
Sent: 17 October 2019 17:58
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>; Clarence Fils=
fils (cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; Patrice Br=
issette (pbrisset) <pbrisset@cisco.com<mailto:pbrisset@cisco.com>>; Swadesh=
 Agrawal (swaagraw) <swaagraw@cisco.com<mailto:swaagraw@cisco.com>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-dawra-bess-srv6-ser=
vices-02

Authors of the draft could you please respond ?




Juniper Business Use Only
From: Rajesh M
Sent: Friday, October 11, 2019 7:00 AM
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02<http=
s://urldefense.com/v3/__https:/tools.ietf.org/html/draft-dawra-bess-srv6-se=
rvices-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1wjCRKLg4MMbWlArh2rC0Srmtc6uKxdGYo=
SjuGxkKh-cx1pT$>

Section3:
However, when the received route is colored with an extended color
   community 'C' and Next-Hop 'N', and the ingress PE has a valid SRv6
   Policy (C, N) associated with SID list <S1,S2, S3> [I-D.filsfils-
   spring-segment-routing-policy], then the effective SR Policy is <S1,
   S2, S3, SRv6-Service-SID>.


When we make effective SR policy cant we remove S3 from List (S3 and SRv6-S=
ervice-SID both belong to Egress).
effective SR Policy can be <S1,S2, SRv6-Service-SID>.





Juniper Business Use Only

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Hi Rajesh=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">That is c=
orrect.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Thanks,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Ketan<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Rajesh M &lt;mrajesh@juniper.net&gt;
<br>
<b>Sent:</b> 18 October 2019 07:23<br>
<b>To:</b> Ketan Talaulikar (ketant) &lt;ketant@cisco.com&gt;; SPRING WG Li=
st &lt;spring@ietf.org&gt;; Clarence Filsfils (cfilsfil) &lt;cfilsfil@cisco=
.com&gt;; Patrice Brissette (pbrisset) &lt;pbrisset@cisco.com&gt;; Swadesh =
Agrawal (swaagraw) &lt;swaagraw@cisco.com&gt;; Peter Psenak (ppsenak)
 &lt;ppsenak@cisco.com&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;<br>
<b>Subject:</b> RE: https://tools.ietf.org/html/draft-dawra-bess-srv6-servi=
ces-02<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Ketan/Peter,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I am assuming this is true even=
 in below case
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"color:red">&#8220;<=
/span></b><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&qu=
ot;Courier New&quot;;color:red">SRv6-Service-SID (END.DT4 SID)is derived fr=
om a locator corresponding to flex algorithm ? &#8221;<o:p></o:p></span></b=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">Thanks<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">Rajesh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.co=
m">ketant@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 6:27 PM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spri=
ng@ietf.org</a>&gt;; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfi=
lsfil@cisco.com">cfilsfil@cisco.com</a>&gt;; Patrice Brissette
 (pbrisset) &lt;<a href=3D"mailto:pbrisset@cisco.com">pbrisset@cisco.com</a=
>&gt;; Swadesh Agrawal (swaagraw) &lt;<a href=3D"mailto:swaagraw@cisco.com"=
>swaagraw@cisco.com</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: <a href=3D"https://tools.ietf.org/html/draft-dawra-bess=
-srv6-services-02">
https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02</a><o:p></o:p=
></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">Hi Rajesh,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">You are correct.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal">Ketan<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 17 October 2019 17:58<br>
<b>To:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@=
cisco.com">cfilsfil@cisco.com</a>&gt;; Patrice Brissette (pbrisset) &lt;<a =
href=3D"mailto:pbrisset@cisco.com">pbrisset@cisco.com</a>&gt;;
 Swadesh Agrawal (swaagraw) &lt;<a href=3D"mailto:swaagraw@cisco.com">swaag=
raw@cisco.com</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://tools.ietf.org/html/draft-d=
awra-bess-srv6-services-02">
https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02</a><o:p></o:p=
></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Authors of the draft could you =
please respond ?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Rajesh M
<br>
<b>Sent:</b> Friday, October 11, 2019 7:00 AM<br>
<b>To:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> <a href=3D"https://urldefense.com/v3/__https:/tools.ietf.or=
g/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1wj=
CRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$">
https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02</a><o:p></o:p=
></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">Section3:&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">However, when the received route is colored=
 with an extended color<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">&nbsp;&nbsp; community 'C' and Next-Hop 'N'=
, and the ingress PE has a valid SRv6<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">&nbsp;&nbsp; Policy (C, N) associated with =
SID list &lt;S1,S2, S3&gt; [I-D.filsfils-<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">&nbsp;&nbsp; spring-segment-routing-policy]=
, then the effective SR Policy is &lt;S1,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">&nbsp;&nbsp; S2, S3, SRv6-Service-SID&gt;.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">When we make effective SR policy cant we=
 remove S3 from List (S3 and SRv6-Service-SID both belong to Egress).<o:p><=
/o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">effective SR Policy can be &lt;S1,S2, SR=
v6-Service-SID&gt;.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
</body>
</html>

--_000_CY4PR11MB1541E0A34E4308CCA9FE3131C16C0CY4PR11MB1541namp_--


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From: Satoru Matsushima <satoru.matsushima@gmail.com>
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Date: Fri, 18 Oct 2019 11:27:13 +0900
Cc: Hirofumi Ichihara <ichihara.hirofumi@gmail.com>, Clarence Filsfils <cfilsfil@cisco.com>, Lizhenbin <lizhenbin@huawei.com>, Satoru Matsushima <satoru.matsushima@g.softbank.co.jp>, "ipv6@ietf.org" <ipv6@ietf.org>, SPRING WG List <spring@ietf.org>
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To: Ca By <cb.list6@gmail.com>
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Subject: Re: [spring] New Version Notification for draft-matsushima-spring-srv6-deployment-status-02.txt
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Hi Cameron,

#get back SPRING list again since it is a use case under SR architecture.

> Its seems your scenario could be instructive for us , i think it is genera=
lly common to dual-stack the edge first, but LINE has a different path

AFAIK, the IP CLOS fabric in LINE DC also supported IPv4 while it is IPv6-on=
ly network which was used to connect the hypervisors with IPv4 addresses usi=
ng RFC5549 based control-plane solution (i.e, v4 NLRI w/ v6 nhop).

It means that the LINE case is also an incremental SRv6 deployment onto exis=
ting IPv6 data-plane.

Cheers,
--satoru

> On Oct 18, 2019, at 11:20, Ca By <cb.list6@gmail.com> wrote:
>=20
> =EF=BB=BF
> Hirofumi,
>=20
> Dropping SPRING since this is strictly an ipv6 question.=20
>=20
> Do you happen to have a deck about LINE supporting ipv6 on the internet? I=
 notice api.line.me does not have aaaa record. And it is curious that you ha=
ve the ability to deploy SRv6 internally but not dual-stack client internet s=
ervices.=20
>=20
> Its seems your scenario could be instructive for us , i think it is genera=
lly common to dual-stack the edge first, but LINE has a different path
> =20
> thanks,
> CB
>=20
>> On Thu, Oct 17, 2019 at 6:29 PM Hirofumi Ichihara <ichihara.hirofumi@gmai=
l.com> wrote:
>> Hi,
>>=20
>> Let me introduce LINE's SRv6 DC use case as well. We have already deploye=
d SRv6 network with our private cloud on production environment. Please have=
 a look at this slide( https://speakerdeck.com/line_developers/line-data-cen=
ter-networking-with-srv6 ) if you're interested in our use case. And also we=
're interested in other DC use cases and implementations.. Please let me kno=
w if you have such information.
>>=20
>> Thanks,
>> Hirofumi
>>=20
>>=20
>> 2019=E5=B9=B410=E6=9C=8817=E6=97=A5(=E6=9C=A8) 21:31 Lizhenbin <lizhenbin=
@huawei.com>:
>>> Hi Folks,
>>> We updated the SRv6 deployment draft as follows. There are two new deplo=
yments of SRv6 from China for reference:=20
>>> China Unicom and CERNET2. In the past two years, China pushed the IPv6 d=
eployment and almost all the IP networks=20
>>> of operators achieve the goal "IPv6 Ready". This provide a strong base f=
or SRv6 deployments which can help operators=20
>>> provide new services based on IPv6 infrastructure. Moreover the easy inc=
remental deployment advantage of SRv6 (refer=20
>>> to https://tools.ietf.org/html/draft-xie-spring-srv6-network-migration-0=
0 ) facilitates the SRv6 deployments in the existing=20
>>> network. Besides the SRv6 deployments proposed in the draft, there will b=
e more SRv6 for different application scenariosin=20
>>> the near future. These SRv6 deployments  are also promoting the IPv6 dep=
loyment and more IPv6 traffic will be beared by=20
>>> these networks. =20
>>>=20
>>>=20
>>>=20
>>> Best Regards,
>>> Robin
>>>=20
>>>=20
>>>=20
>>> ________________________________________
>>> =E5=8F=91=E4=BB=B6=E4=BA=BA: internet-drafts@ietf.org [internet-drafts@i=
etf.org]
>>> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=A5=
 11:15
>>> =E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence Filsfils; Lizhenbin; Sa=
toru Matsushima
>>> =E4=B8=BB=E9=A2=98: New Version Notification for draft-matsushima-spring=
-srv6-deployment-status-02.txt
>>>=20
>>> A new version of I-D, draft-matsushima-spring-srv6-deployment-status-02.=
txt
>>> has been successfully submitted by Zafar Ali and posted to the
>>> IETF repository.
>>>=20
>>> Name:           draft-matsushima-spring-srv6-deployment-status
>>> Revision:       02
>>> Title:          SRv6 Implementation and Deployment Status
>>> Document date:  2019-10-14
>>> Group:          Individual Submission
>>> Pages:          19
>>> URL:            https://www.ietf.org/internet-drafts/draft-matsushima-sp=
ring-srv6-deployment-status-02.txt
>>> Status:         https://datatracker.ietf.org/doc/draft-matsushima-spring=
-srv6-deployment-status/
>>> Htmlized:       https://tools.ietf.org/html/draft-matsushima-spring-srv6=
-deployment-status-02
>>> Htmlized:       https://datatracker.ietf.org/doc/html/draft-matsushima-s=
pring-srv6-deployment-status
>>> Diff:           https://www.ietf.org/rfcdiff?url2=3Ddraft-matsushima-spr=
ing-srv6-deployment-status-02
>>>=20
>>> Abstract:
>>>    This draft provides an overview of IPv6 Segment Routing (SRv6)
>>>    deployment status.  It lists various SRv6 features that have been
>>>    deployed in the production networks.  It also provides an overview of=

>>>    SRv6 implementation and interoperability testing status.
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>> Please note that it may take a couple of minutes from the time of submis=
sion
>>> until the htmlized version and diff are available at tools.ietf.org.
>>>=20
>>> The IETF Secretariat
>>> --------------------------------------------------------------------
>>> IETF IPv6 working group mailing list
>>> ipv6@ietf.org
>>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
>>> --------------------------------------------------------------------
>> --------------------------------------------------------------------
>> IETF IPv6 working group mailing list
>> ipv6@ietf.org
>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
>> --------------------------------------------------------------------

--Apple-Mail-4578AEB5-C0BF-4A80-A3D8-A7E3454A7A1B
Content-Type: text/html;
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Hi Cameron,<div><br></div><div>#get back SP=
RING list again since it is a use case under SR architecture.</div><div><br>=
</div><div><blockquote type=3D"cite"><div dir=3D"ltr"><div dir=3D"auto">Its s=
eems your scenario could be instructive for us , i think it is generally com=
mon to dual-stack the edge first, but LINE has a different path</div></div><=
/blockquote><div><br></div><div>AFAIK, the IP CLOS fabric in LINE DC also su=
pported IPv4 while it is IPv6-only network which was used to connect the hyp=
ervisors with IPv4 addresses using RFC5549 based control-plane solution (i.e=
, v4 NLRI w/ v6 nhop).</div><div><br></div>It means that&nbsp;the LINE case i=
s also an incremental SRv6 deployment onto existing IPv6 data-plane.<br><br>=
Cheers,<br><div dir=3D"ltr">--satoru</div><div dir=3D"ltr"><br><blockquote t=
ype=3D"cite">On Oct 18, 2019, at 11:20, Ca By &lt;cb.list6@gmail.com&gt; wro=
te:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=
=BB=BF<div><div dir=3D"auto">Hirofumi,<br></div><div dir=3D"auto"><br></div>=
<div dir=3D"auto">Dropping SPRING since this is strictly an ipv6 question.&n=
bsp;</div></div><div dir=3D"auto"><br></div><div dir=3D"auto">Do you happen t=
o have a deck about LINE supporting ipv6 on the internet? I notice <a href=3D=
"http://api.line.me">api.line.me</a> does not have aaaa record. And it is cu=
rious that you have the ability to deploy SRv6 internally but not dual-stack=
 client internet services.&nbsp;</div><div dir=3D"auto"><br></div><div dir=3D=
"auto">Its seems your scenario could be instructive for us , i think it is g=
enerally common to dual-stack the edge first, but LINE has a different path<=
/div><div dir=3D"auto">&nbsp;</div><div><div dir=3D"auto">thanks,</div><div d=
ir=3D"auto">CB</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D=
"gmail_attr">On Thu, Oct 17, 2019 at 6:29 PM Hirofumi Ichihara &lt;<a href=3D=
"mailto:ichihara.hirofumi@gmail.com">ichihara.hirofumi@gmail.com</a>&gt; wro=
te:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"=
>Hi,<div><br></div><div>Let me introduce LINE's SRv6 DC use case as well. We=
 have already deployed SRv6 network with our private cloud on production env=
ironment. Please have a look at this slide( <a href=3D"https://speakerdeck.c=
om/line_developers/line-data-center-networking-with-srv6" target=3D"_blank">=
https://speakerdeck.com/line_developers/line-data-center-networking-with-srv=
6</a>&nbsp;) if you're interested in our use case. And also we're interested=
 in other DC use cases and implementations.. Please let me know if you have s=
uch information.</div><div><br></div><div>Thanks,</div><div>Hirofumi</div><d=
iv><br></div></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" cla=
ss=3D"gmail_attr">2019=E5=B9=B410=E6=9C=8817=E6=97=A5(=E6=9C=A8) 21:31 Lizhe=
nbin &lt;<a href=3D"mailto:lizhenbin@huawei.com" target=3D"_blank">lizhenbin=
@huawei.com</a>&gt;:<br></div></div><div class=3D"gmail_quote"><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px=
;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex=
">Hi Folks,<br>
We updated the SRv6 deployment draft as follows. There are two new deploymen=
ts of SRv6 from China for reference: <br>
China Unicom and CERNET2. In the past two years, China pushed the IPv6 deplo=
yment and almost all the IP networks <br>
of operators achieve the goal "IPv6 Ready". This provide a strong base for S=
Rv6 deployments which can help operators <br>
provide new services based on IPv6 infrastructure. Moreover the easy increme=
ntal deployment advantage of SRv6 (refer <br>
to <a href=3D"https://tools.ietf.org/html/draft-xie-spring-srv6-network-migr=
ation-00" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html/d=
raft-xie-spring-srv6-network-migration-00</a> ) facilitates the SRv6 deploym=
ents in the existing <br>
network. Besides the SRv6 deployments proposed in the draft, there will be m=
ore SRv6 for different application scenariosin <br>
the near future. These SRv6 deployments&nbsp; are also promoting the IPv6 de=
ployment and more IPv6 traffic will be beared by <br>
these networks.&nbsp; <br>
<br>
<br>
<br>
Best Regards,<br>
Robin<br>
<br>
<br>
<br>
________________________________________<br>
=E5=8F=91=E4=BB=B6=E4=BA=BA: <a href=3D"mailto:internet-drafts@ietf.org" tar=
get=3D"_blank">internet-drafts@ietf.org</a> [<a href=3D"mailto:internet-draf=
ts@ietf.org" target=3D"_blank">internet-drafts@ietf.org</a>]<br>
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=A5 11=
:15<br>
=E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence Filsfils; Lizhenbin; Satoru=
 Matsushima<br>
=E4=B8=BB=E9=A2=98: New Version Notification for draft-matsushima-spring-srv=
6-deployment-status-02.txt<br>
<br>
A new version of I-D, draft-matsushima-spring-srv6-deployment-status-02.txt<=
br>
has been successfully submitted by Zafar Ali and posted to the<br>
IETF repository.<br>
<br>
Name:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;draft-matsushima-spring-srv6-d=
eployment-status<br>
Revision:&nbsp; &nbsp; &nbsp; &nbsp;02<br>
Title:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SRv6 Implementation and Deployment S=
tatus<br>
Document date:&nbsp; 2019-10-14<br>
Group:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Individual Submission<br>
Pages:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 19<br>
URL:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href=3D"https://www.ietf.or=
g/internet-drafts/draft-matsushima-spring-srv6-deployment-status-02.txt" rel=
=3D"noreferrer" target=3D"_blank">https://www.ietf.org/internet-drafts/draft=
-matsushima-spring-srv6-deployment-status-02.txt</a><br>
Status:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href=3D"https://datatracker.ietf=
.org/doc/draft-matsushima-spring-srv6-deployment-status/" rel=3D"noreferrer"=
 target=3D"_blank">https://datatracker.ietf.org/doc/draft-matsushima-spring-=
srv6-deployment-status/</a><br>
Htmlized:&nbsp; &nbsp; &nbsp; &nbsp;<a href=3D"https://tools.ietf.org/html/d=
raft-matsushima-spring-srv6-deployment-status-02" rel=3D"noreferrer" target=3D=
"_blank">https://tools.ietf.org/html/draft-matsushima-spring-srv6-deployment=
-status-02</a><br>
Htmlized:&nbsp; &nbsp; &nbsp; &nbsp;<a href=3D"https://datatracker.ietf.org/=
doc/html/draft-matsushima-spring-srv6-deployment-status" rel=3D"noreferrer" t=
arget=3D"_blank">https://datatracker.ietf.org/doc/html/draft-matsushima-spri=
ng-srv6-deployment-status</a><br>
Diff:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href=3D"https://www.ietf.or=
g/rfcdiff?url2=3Ddraft-matsushima-spring-srv6-deployment-status-02" rel=3D"n=
oreferrer" target=3D"_blank">https://www.ietf.org/rfcdiff?url2=3Ddraft-matsu=
shima-spring-srv6-deployment-status-02</a><br>
<br>
Abstract:<br>
&nbsp; &nbsp;This draft provides an overview of IPv6 Segment Routing (SRv6)<=
br>
&nbsp; &nbsp;deployment status.&nbsp; It lists various SRv6 features that ha=
ve been<br>
&nbsp; &nbsp;deployed in the production networks.&nbsp; It also provides an o=
verview of<br>
&nbsp; &nbsp;SRv6 implementation and interoperability testing status.<br>
<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submission=
<br>
until the htmlized version and diff are available at <a href=3D"http://tools=
.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
The IETF Secretariat<br>
--------------------------------------------------------------------<br>
IETF IPv6 working group mailing list<br>
<a href=3D"mailto:ipv6@ietf.org" target=3D"_blank">ipv6@ietf.org</a><br>
Administrative Requests: <a href=3D"https://www.ietf.org/mailman/listinfo/ip=
v6" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listin=
fo/ipv6</a><br>
--------------------------------------------------------------------<br>
</blockquote></div>
--------------------------------------------------------------------<br>
IETF IPv6 working group mailing list<br>
<a href=3D"mailto:ipv6@ietf.org" target=3D"_blank">ipv6@ietf.org</a><br>
Administrative Requests: <a href=3D"https://www.ietf.org/mailman/listinfo/ip=
v6" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listin=
fo/ipv6</a><br>
--------------------------------------------------------------------<br>
</blockquote></div></div>
</div></blockquote></div></body></html>=

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In-Reply-To: <4E88B5A5-11A2-4258-82ED-5BC186CDD1A4@gmail.com>
From: Hirofumi Ichihara <ichihara.hirofumi@gmail.com>
Date: Fri, 18 Oct 2019 11:58:04 +0900
Message-ID: <CAKrd4DNLrBfQ0uWjw0ceRunBMfTGe7gvsHv7TsbUVX0Qp6021w@mail.gmail.com>
To: Ca By <cb.list6@gmail.com>
Cc: Clarence Filsfils <cfilsfil@cisco.com>, Satoru Matsushima <satoru.matsushima@gmail.com>,  Lizhenbin <lizhenbin@huawei.com>,  Satoru Matsushima <satoru.matsushima@g.softbank.co.jp>, "ipv6@ietf.org" <ipv6@ietf.org>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] New Version Notification for draft-matsushima-spring-srv6-deployment-status-02.txt
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Hi Cameron,

I believe that we'll support IPv6 for our LINE service on the internet but
it's different from this use case like Satoru mentioned. In this case, we
focus on providing multi-tenant network for our users with SRv6.

Thanks,
Hirofumi

2019=E5=B9=B410=E6=9C=8818=E6=97=A5(=E9=87=91) 11:27 Satoru Matsushima <sat=
oru.matsushima@gmail.com>:

> Hi Cameron,
>
> #get back SPRING list again since it is a use case under SR architecture.
>
> Its seems your scenario could be instructive for us , i think it is
> generally common to dual-stack the edge first, but LINE has a different p=
ath
>
>
> AFAIK, the IP CLOS fabric in LINE DC also supported IPv4 while it is
> IPv6-only network which was used to connect the hypervisors with IPv4
> addresses using RFC5549 based control-plane solution (i.e, v4 NLRI w/ v6
> nhop).
>
> It means that the LINE case is also an incremental SRv6 deployment onto
> existing IPv6 data-plane.
>
> Cheers,
> --satoru
>
> On Oct 18, 2019, at 11:20, Ca By <cb.list6@gmail.com> wrote:
>
> =EF=BB=BF
> Hirofumi,
>
> Dropping SPRING since this is strictly an ipv6 question.
>
> Do you happen to have a deck about LINE supporting ipv6 on the internet? =
I
> notice api.line.me does not have aaaa record. And it is curious that you
> have the ability to deploy SRv6 internally but not dual-stack client
> internet services.
>
> Its seems your scenario could be instructive for us , i think it is
> generally common to dual-stack the edge first, but LINE has a different p=
ath
>
> thanks,
> CB
>
> On Thu, Oct 17, 2019 at 6:29 PM Hirofumi Ichihara <
> ichihara.hirofumi@gmail.com> wrote:
>
>> Hi,
>>
>> Let me introduce LINE's SRv6 DC use case as well. We have already
>> deployed SRv6 network with our private cloud on production environment.
>> Please have a look at this slide(
>> https://speakerdeck.com/line_developers/line-data-center-networking-with=
-srv6 )
>> if you're interested in our use case. And also we're interested in other=
 DC
>> use cases and implementations.. Please let me know if you have such
>> information.
>>
>> Thanks,
>> Hirofumi
>>
>>
>> 2019=E5=B9=B410=E6=9C=8817=E6=97=A5(=E6=9C=A8) 21:31 Lizhenbin <lizhenbi=
n@huawei.com>:
>>
>>> Hi Folks,
>>> We updated the SRv6 deployment draft as follows. There are two new
>>> deployments of SRv6 from China for reference:
>>> China Unicom and CERNET2. In the past two years, China pushed the IPv6
>>> deployment and almost all the IP networks
>>> of operators achieve the goal "IPv6 Ready". This provide a strong base
>>> for SRv6 deployments which can help operators
>>> provide new services based on IPv6 infrastructure. Moreover the easy
>>> incremental deployment advantage of SRv6 (refer
>>> to
>>> https://tools.ietf.org/html/draft-xie-spring-srv6-network-migration-00
>>> ) facilitates the SRv6 deployments in the existing
>>> network. Besides the SRv6 deployments proposed in the draft, there will
>>> be more SRv6 for different application scenariosin
>>> the near future. These SRv6 deployments  are also promoting the IPv6
>>> deployment and more IPv6 traffic will be beared by
>>> these networks.
>>>
>>>
>>>
>>> Best Regards,
>>> Robin
>>>
>>>
>>>
>>> ________________________________________
>>> =E5=8F=91=E4=BB=B6=E4=BA=BA: internet-drafts@ietf.org [internet-drafts@=
ietf.org]
>>> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=
=A5 11:15
>>> =E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence Filsfils; Lizhenbin; S=
atoru Matsushima
>>> =E4=B8=BB=E9=A2=98: New Version Notification for
>>> draft-matsushima-spring-srv6-deployment-status-02.txt
>>>
>>> A new version of I-D,
>>> draft-matsushima-spring-srv6-deployment-status-02.txt
>>> has been successfully submitted by Zafar Ali and posted to the
>>> IETF repository.
>>>
>>> Name:           draft-matsushima-spring-srv6-deployment-status
>>> Revision:       02
>>> Title:          SRv6 Implementation and Deployment Status
>>> Document date:  2019-10-14
>>> Group:          Individual Submission
>>> Pages:          19
>>> URL:
>>> https://www.ietf.org/internet-drafts/draft-matsushima-spring-srv6-deplo=
yment-status-02.txt
>>> Status:
>>> https://datatracker.ietf.org/doc/draft-matsushima-spring-srv6-deploymen=
t-status/
>>> Htmlized:
>>> https://tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-sta=
tus-02
>>> Htmlized:
>>> https://datatracker.ietf.org/doc/html/draft-matsushima-spring-srv6-depl=
oyment-status
>>> Diff:
>>> https://www.ietf.org/rfcdiff?url2=3Ddraft-matsushima-spring-srv6-deploy=
ment-status-02
>>>
>>> Abstract:
>>>    This draft provides an overview of IPv6 Segment Routing (SRv6)
>>>    deployment status.  It lists various SRv6 features that have been
>>>    deployed in the production networks.  It also provides an overview o=
f
>>>    SRv6 implementation and interoperability testing status.
>>>
>>>
>>>
>>>
>>>
>>> Please note that it may take a couple of minutes from the time of
>>> submission
>>> until the htmlized version and diff are available at tools.ietf.org.
>>>
>>> The IETF Secretariat
>>> --------------------------------------------------------------------
>>> IETF IPv6 working group mailing list
>>> ipv6@ietf.org
>>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
>>> --------------------------------------------------------------------
>>>
>> --------------------------------------------------------------------
>> IETF IPv6 working group mailing list
>> ipv6@ietf.org
>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
>> --------------------------------------------------------------------
>>
>

--00000000000068717c05952681fb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Cameron,<div><br></div><div>I believe that we&#39;ll su=
pport IPv6 for our LINE service on the internet but it&#39;s different from=
 this use case like Satoru mentioned. In this case, we focus on providing m=
ulti-tenant network for our users with SRv6.</div><div><br></div><div>Thank=
s,</div><div>Hirofumi</div></div><br><div class=3D"gmail_quote"><div dir=3D=
"ltr" class=3D"gmail_attr">2019=E5=B9=B410=E6=9C=8818=E6=97=A5(=E9=87=91) 1=
1:27 Satoru Matsushima &lt;<a href=3D"mailto:satoru.matsushima@gmail.com">s=
atoru.matsushima@gmail.com</a>&gt;:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-sty=
le:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir=3D"a=
uto">Hi Cameron,<div><br></div><div>#get back SPRING list again since it is=
 a use case under SR architecture.</div><div><br></div><div><blockquote typ=
e=3D"cite"><div dir=3D"ltr"><div dir=3D"auto">Its seems your scenario could=
 be instructive for us , i think it is generally common to dual-stack the e=
dge first, but LINE has a different path</div></div></blockquote><div><br><=
/div><div>AFAIK, the IP CLOS fabric in LINE DC also supported IPv4 while it=
 is IPv6-only network which was used to connect the hypervisors with IPv4 a=
ddresses using RFC5549 based control-plane solution (i.e, v4 NLRI w/ v6 nho=
p).</div><div><br></div>It means that=C2=A0the LINE case is also an increme=
ntal SRv6 deployment onto existing IPv6 data-plane.<br><br>Cheers,<br><div =
dir=3D"ltr">--satoru</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On=
 Oct 18, 2019, at 11:20, Ca By &lt;<a href=3D"mailto:cb.list6@gmail.com" ta=
rget=3D"_blank">cb.list6@gmail.com</a>&gt; wrote:<br><br></blockquote></div=
><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<div><div dir=3D"auto"=
>Hirofumi,<br></div><div dir=3D"auto"><br></div><div dir=3D"auto">Dropping =
SPRING since this is strictly an ipv6 question.=C2=A0</div></div><div dir=
=3D"auto"><br></div><div dir=3D"auto">Do you happen to have a deck about LI=
NE supporting ipv6 on the internet? I notice <a href=3D"http://api.line.me"=
 target=3D"_blank">api.line.me</a> does not have aaaa record. And it is cur=
ious that you have the ability to deploy SRv6 internally but not dual-stack=
 client internet services.=C2=A0</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Its seems your scenario could be instructive for us , i think it =
is generally common to dual-stack the edge first, but LINE has a different =
path</div><div dir=3D"auto">=C2=A0</div><div><div dir=3D"auto">thanks,</div=
><div dir=3D"auto">CB</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Thu, Oct 17, 2019 at 6:29 PM Hirofumi Ichihara &lt;=
<a href=3D"mailto:ichihara.hirofumi@gmail.com" target=3D"_blank">ichihara.h=
irofumi@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:=
solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"=
><div dir=3D"ltr">Hi,<div><br></div><div>Let me introduce LINE&#39;s SRv6 D=
C use case as well. We have already deployed SRv6 network with our private =
cloud on production environment. Please have a look at this slide( <a href=
=3D"https://speakerdeck.com/line_developers/line-data-center-networking-wit=
h-srv6" target=3D"_blank">https://speakerdeck.com/line_developers/line-data=
-center-networking-with-srv6</a>=C2=A0) if you&#39;re interested in our use=
 case. And also we&#39;re interested in other DC use cases and implementati=
ons.. Please let me know if you have such information.</div><div><br></div>=
<div>Thanks,</div><div>Hirofumi</div><div><br></div></div></div><br><div cl=
ass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">2019=E5=B9=B410=
=E6=9C=8817=E6=97=A5(=E6=9C=A8) 21:31 Lizhenbin &lt;<a href=3D"mailto:lizhe=
nbin@huawei.com" target=3D"_blank">lizhenbin@huawei.com</a>&gt;:<br></div><=
/div><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;bord=
er-left-color:rgb(204,204,204);padding-left:1ex">Hi Folks,<br>
We updated the SRv6 deployment draft as follows. There are two new deployme=
nts of SRv6 from China for reference: <br>
China Unicom and CERNET2. In the past two years, China pushed the IPv6 depl=
oyment and almost all the IP networks <br>
of operators achieve the goal &quot;IPv6 Ready&quot;. This provide a strong=
 base for SRv6 deployments which can help operators <br>
provide new services based on IPv6 infrastructure. Moreover the easy increm=
ental deployment advantage of SRv6 (refer <br>
to <a href=3D"https://tools.ietf.org/html/draft-xie-spring-srv6-network-mig=
ration-00" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html=
/draft-xie-spring-srv6-network-migration-00</a> ) facilitates the SRv6 depl=
oyments in the existing <br>
network. Besides the SRv6 deployments proposed in the draft, there will be =
more SRv6 for different application scenariosin <br>
the near future. These SRv6 deployments=C2=A0 are also promoting the IPv6 d=
eployment and more IPv6 traffic will be beared by <br>
these networks.=C2=A0 <br>
<br>
<br>
<br>
Best Regards,<br>
Robin<br>
<br>
<br>
<br>
________________________________________<br>
=E5=8F=91=E4=BB=B6=E4=BA=BA: <a href=3D"mailto:internet-drafts@ietf.org" ta=
rget=3D"_blank">internet-drafts@ietf.org</a> [<a href=3D"mailto:internet-dr=
afts@ietf.org" target=3D"_blank">internet-drafts@ietf.org</a>]<br>
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=A5 1=
1:15<br>
=E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence Filsfils; Lizhenbin; Sator=
u Matsushima<br>
=E4=B8=BB=E9=A2=98: New Version Notification for draft-matsushima-spring-sr=
v6-deployment-status-02.txt<br>
<br>
A new version of I-D, draft-matsushima-spring-srv6-deployment-status-02.txt=
<br>
has been successfully submitted by Zafar Ali and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-matsushima-spring-srv6-=
deployment-status<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A002<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 SRv6 Implementation and Deployment=
 Status<br>
Document date:=C2=A0 2019-10-14<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 19<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-matsushima-spring-srv6-deployment-status-02.txt" r=
el=3D"noreferrer" target=3D"_blank">https://www.ietf.org/internet-drafts/dr=
aft-matsushima-spring-srv6-deployment-status-02.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-matsushima-spring-srv6-deployment-status/" rel=3D"noreferre=
r" target=3D"_blank">https://datatracker.ietf.org/doc/draft-matsushima-spri=
ng-srv6-deployment-status/</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-matsushima-spring-srv6-deployment-status-02" rel=3D"noreferrer" targe=
t=3D"_blank">https://tools.ietf.org/html/draft-matsushima-spring-srv6-deplo=
yment-status-02</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org=
/doc/html/draft-matsushima-spring-srv6-deployment-status" rel=3D"noreferrer=
" target=3D"_blank">https://datatracker.ietf.org/doc/html/draft-matsushima-=
spring-srv6-deployment-status</a><br>
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.o=
rg/rfcdiff?url2=3Ddraft-matsushima-spring-srv6-deployment-status-02" rel=3D=
"noreferrer" target=3D"_blank">https://www.ietf.org/rfcdiff?url2=3Ddraft-ma=
tsushima-spring-srv6-deployment-status-02</a><br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This draft provides an overview of IPv6 Segment Routing (SRv6)=
<br>
=C2=A0 =C2=A0deployment status.=C2=A0 It lists various SRv6 features that h=
ave been<br>
=C2=A0 =C2=A0deployed in the production networks.=C2=A0 It also provides an=
 overview of<br>
=C2=A0 =C2=A0SRv6 implementation and interoperability testing status.<br>
<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
The IETF Secretariat<br>
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</blockquote></div>
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</blockquote></div></div>
</div></blockquote></div></div></blockquote></div>

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From: "Chengli (Cheng Li)" <chengli13@huawei.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, "spring@ietf.org" <spring@ietf.org>
CC: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
Thread-Topic: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16
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From nobody Thu Oct 17 20:42:57 2019
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Subject: Re: [spring] [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Support the adoption.

 

B.R.

Weiqiang Cheng

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, October 15, 2019 2:13 AM
To: 'idr wg' <idr@ietf.org>; 'SPRING WG List' <spring@ietf.org>
Subject: Re: [Idr] Adoption:
draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and
draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to
10/21/2019]

 

Greetings IDR and Spring WG

 

The WG Adoption for the two IDR drafts related to IDR received a level
support below the threshold to accept this draft into the IDR WG.  There
were no objection, but there was simply a low level of response. 

 

This 1 week extension to the Adoption call is to let the members of both the
IDR and SPRING WG comment on whether these drafts have matured enough to be
IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination of
whether either of these two drafts have enough support to be accepted. 

 

Thank you,  Susan  Hares

IDR co-chair 

 

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

 

This begins a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019]


!$         draft-li-bgp-ls-sr-policy-path-segment-03.txt and 

!$         draft-li-idr-sr-policy-path-segment-01.txt. 

 

You can access these two drafts at the following location: 

 

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/

 

https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/

 

The authors have pointed out that the adoption of this 

draft since the following  SR-MPLS Path Segment draft has been adopted: 

 

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00

 

Please consider the following questions in your responses? 

 

1)      Should this SR Policy technology be included in BGP for SR-MPLS 

 

Spring has adopted the draft, but IDR can provide feedback 

to spring about putting this technology in BGP.

 

2)      Is this technology a good way to implement the required 

Features in BGP? 

 

3)      Is this technology ready for adoption? 

 

4)      Do you have any concerns about adopting this technology? 

 

 

Cheers, Susan Hares 


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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Support the =
adoption.</span><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>B.R.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Weiqiang =
Cheng<o:p></o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Idr [<a =
href=3D"mailto:idr-bounces@ietf.org">mailto:idr-bounces@ietf.org</a>] =
<b>On Behalf Of </b>Susan Hares<br><b>Sent:</b> Tuesday, October 15, =
2019 2:13 AM<br><b>To:</b> 'idr wg' &lt;<a =
href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&gt;; 'SPRING WG List' =
&lt;<a =
href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;<br><b>Subject:</b=
> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt =
and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to =
10/21/2019]<o:p></o:p></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:#1F497D'>Greetings IDR and Spring =
WG<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>The WG =
Adoption for the two IDR drafts related to IDR received a level support =
below the threshold to accept this draft into the IDR WG.&nbsp; There =
were no objection, but there was simply a low level of response. =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>This 1 week =
extension to the Adoption call is to let the members of both the IDR and =
SPRING WG comment on whether these drafts have matured enough to be IDR =
WG drafts. &nbsp;On 10/21/2019, the IDR chairs will make a determination =
of whether either of these two drafts have enough support to be =
accepted. <o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Thank =
you,&nbsp; Susan&nbsp; Hares<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>IDR =
co-chair <o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Idr [<a =
href=3D"mailto:idr-bounces@ietf.org">mailto:idr-bounces@ietf.org</a>] =
<b>On Behalf Of </b>Susan Hares<br><b>Sent:</b> Tuesday, September 17, =
2019 12:35 PM<br><b>To:</b> 'idr wg'<br><b>Subject:</b> [Idr] Adoption: =
draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and =
draft-li-sr-policy-path-segment-01.txt [9/17 to =
10/1/2019]<o:p></o:p></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>This begins a 2 week WG Adoption call two related drafts =
[9/17 to 10/1/2019] <o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:38.25pt;text-indent:-18.0pt'><span lang=3DEN-US =
style=3D'font-family:Symbol'>&middot;</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span><span lang=3DEN-US>draft-li-bgp-ls-sr-policy-path-segment-03.txt =
and <o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:38.25pt;text-indent:-18.0pt'><span lang=3DEN-US =
style=3D'font-family:Symbol'>&middot;</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span><span lang=3DEN-US>draft-li-idr-sr-policy-path-segment-01.txt. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>You can access these two drafts at the following location: =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><a =
href=3D"https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-pa=
th-segment/">https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-poli=
cy-path-segment/</a><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><a =
href=3D"https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segm=
ent/">https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segmen=
t/</a><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>The authors have pointed out that the adoption of this =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US>draft =
since the following &nbsp;SR-MPLS Path Segment draft has been adopted: =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><a =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-0=
0">https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00</a>=
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Please consider the following questions in your responses? =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoListParagraph =
style=3D'text-indent:-18.0pt'><span lang=3DEN-US>1)</span><span =
lang=3DEN-US style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US>Should this SR Policy technology be included in BGP for =
SR-MPLS <o:p></o:p></span></p><p class=3DMsoListParagraph><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoListParagraph><span lang=3DEN-US>Spring has adopted the =
draft, but IDR can provide feedback <o:p></o:p></span></p><p =
class=3DMsoListParagraph><span lang=3DEN-US>to spring about putting this =
technology in BGP.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoListParagraph =
style=3D'text-indent:-18.0pt'><span lang=3DEN-US>2)</span><span =
lang=3DEN-US style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US>Is this technology a good way to implement the required =
<o:p></o:p></span></p><p class=3DMsoListParagraph><span =
lang=3DEN-US>Features in BGP? <o:p></o:p></span></p><p =
class=3DMsoListParagraph><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoListParagraph =
style=3D'text-indent:-18.0pt'><span lang=3DEN-US>3)</span><span =
lang=3DEN-US style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US>Is this technology ready for adoption? =
<o:p></o:p></span></p><p class=3DMsoListParagraph><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoListParagraph =
style=3D'text-indent:-18.0pt'><span lang=3DEN-US>4)</span><span =
lang=3DEN-US style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US>Do you have any concerns about adopting this technology? =
<o:p></o:p></span></p><p class=3DMsoListParagraph><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Cheers, Susan Hares =
<o:p></o:p></span></p></div></body></html>
------=_NextPart_000_0196_01D585A9.1E27F500--




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From: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">The =
value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent the =
last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 node=
 copy IPv6 SID corresponding to [SL]=3D0 to
 DA field of IP packet, when enable PSP flavor at same time, the penultimat=
e SRv6 node will check the [SL] value, if it is 0, then pop SRH, these extr=
a action is pseudocode of PSP. This logic has no problem.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;spring-bounces@ietf.org&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=
=BA=DA&quot;,sans-serif">=C4=EA</span><span lang=3D"EN-US">10</span><span s=
tyle=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=D4=C2=
</span><span lang=3D"EN-US">18</span><span style=3D"font-family:&quot;=CE=
=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C8=D5</span><span lang=3D"EN-US"> =
6:38<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;pcamaril@cisco.com&gt;; SPRING WG=
 List &lt;spring@ietf.org&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;<br>
<b>Subject:</b> Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-=
srv6-network-programming-04#page-24<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">WANG had given below use case :=
 But using existing PSP logic this will not work.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In below at PSP router updated =
SL will be 1 (since END.DT4 is still there) ,so SRH pop won=A1=AFt happen.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbs=
p;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbs=
p;&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">WANG use case:<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white">=A1=B0For example in SRv6-based=
 L3VPN service scenario, The ingress PE within SRv6-enabled domain can util=
ize SR-TE policy to enable TE-path function
 when encapsulating and transiting L3VPN traffic, The Ingress PE push on cu=
stomer packets with SID list representing SR-TE policy plus END.DT4 as last=
 SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be designed to=
 perform in related SRv6 endpoint.
 Imaging the PSP, the penultimate Endpoint can perform PSP, e.g. copy the l=
ast SID (END.DT4) of SRH to destination field of IPv6 header and POP the SR=
H, then forwarding it toward egress PE identified by DA=A1=B1<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco=
.com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 10:13 PM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spri=
ng@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rajesh,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This has already been replied l=
ess than one week ago.. Please see:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://urldefense.c=
om/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJj=
lg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9J=
w7HGIr9o9$">https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecX=
FxqJjlg_c</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES"><a href=3D"https://urldefense.com/=
v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfa=
k__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P=
8QaU_7$"><span lang=3D"EN-US">https://mailarchive.ietf.org/arch/msg/spring/=
WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><span lang=3D"EN-US"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span lang=3D"ES" st=
yle=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Friday, 11 October 2019 at 03:47<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc: </b>Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;, Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject: </b>[spring] <a href=3D"https://tools.ietf.org/html/draft-ietf-=
spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES"><o:p>=
&nbsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">Wanted to know the use =
case where we only POP the SRH ?<o:p></o:p></span></pre>
<h4 style=3D"margin-left:36.0pt"><span lang=3D"ES"><a href=3D"https://urlde=
fense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-pr=
ogramming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7J=
IhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$">4.16.1</a></span><a name=3D"section-4.=
16..1"></a><span lang=3D"ES" style=3D"font-family:&quot;Courier New&quot;">=
.&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><span lang=3D"ES"><o:p></o:p=
></span></h4>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; The SRH pr=
ocessing of the End, End.X and End.T behaviors are<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; modified: =
after the instruction &quot;S14.&nbsp; Update IPv6 DA with Segment<o:p></o:=
p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; List[Segme=
nts Left]&quot; is executed, the following instructions must be<o:p></o:p><=
/span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; executed a=
s well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbs=
p;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbs=
p;&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp=
;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:36.0pt;margin-bottom:.=
0001pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
</div>
</body>
</html>

--_000_02b54f9299ce4820b83e9344e8a5f049nokiasbellcom_--


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Date: Fri, 18 Oct 2019 14:05:21 +0900
Cc: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, "spring@ietf.org" <spring@ietf.org>, draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
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Joel,

> 2019/10/18 1:14=E3=80=81Joel M. Halpern =
<jmh@joelhalpern.com>=E3=81=AE=E3=83=A1=E3=83=BC=E3=83=AB:
>=20
> Pretending it is legitimate, let me ask a different aspect of the =
question.
>=20
> Removing bytes (aor adding bytes) from arbitrary positions in the =
middle of a packet is generally any extremely painful operation.  Why =
would we want a standard that mandated such an operation?  Savings a few =
bytes on SR hop (sure, several IP router hops) seems a small benefit for =
such a cost.
>=20

That sounds weird comment for me. We have deployed that type of function =
with no compromise in terms of of both performance and operation within =
reasonable and affordable cost.

Cheers,
--satoru


> Yours,
> Joel
>=20
> On 10/17/2019 12:09 PM, Pablo Camarillo (pcamaril) wrote:
>> Hi Joel,
>> RFC8200 permits extension header processing, insertion, deletion at a =
node identified in the Destination Address field of the IPv6 header. =
This has been discussed in other threads like =
https://mailarchive.ietf.org/arch/msg/ipv6/Ypnpw-oneCb7W6s41dVZGMok0Nw .
>> Thanks,
>> Pablo
>> =EF=BB=BF-----Original Message-----
>> From: "Joel M. Halpern" <jmh@joelhalpern.com>
>> Date: Thursday, 17 October 2019 at 15:26
>> To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, =
"spring@ietf.org" <spring@ietf.org>
>> Cc: draft-ietf-spring-srv6-network-programming =
<draft-ietf-spring-srv6-network-programming@ietf.org>
>> Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: =
Section 4.16
>> Resent from: <alias-bounces@ietf.org>
>> Resent to: <cf@cisco.com>, <pcamaril@cisco.com>, <john@leddy.net>, =
<daniel.voyer@bell.ca>, <satoru.matsushima@g.softbank.co.jp>, =
<lizhenbin@huawei.com>
>> Resent date: Thursday, 17 October 2019 at 15:26
>>     Removing a header from an IPv6 packet (without removing the whole =
IPv6
>>     header) is a violation of RFC 8200.
>>          As such, it should be removed from the base network =
programming draft.
>>     If you really want it, put it in the new insertion draft.  And =
justify it.
>>          With regard to the example of off-load, the usual practice =
has been to
>>     avoid standardizing off-load behaviors in the IETF.  the NIC =
vendors
>>     come up with all sorts of ways to improve performance that =
violate the
>>     specifications.  We do not endorse that, and leave the need for
>>     consenting devices engaging in proprietary communication to them.
>>          Yours,
>>     Joel
>>          On 10/17/2019 5:41 AM, Pablo Camarillo (pcamaril) wrote:
>>     > Li,
>>     >
>>     >     Node1's
>>     >
>>     >     Tenant-100 IPv4 table is: T.Encaps with SRv6 Policy =
<B:3:C4::,
>>     >
>>     >     B:8:D100::>.
>>     >
>>     >     When 1 receives a packet P from CE-A destined to =
20.20.20.20, P looks
>>     >
>>     >     up its tenant-100 IPv4 table and finds an SR-VPN entry =
20/8.  As a
>>     >
>>     >     consequence, 1 pushes an outer header with SA=3DA:1::, =
DA=3DB:3:C4::,
>>     >
>>     >     NH=3DSRH followed by SRH (B:8:D100::, B:3:C4::; SL=3D1; =
NH=3D4). 1 then
>>     >
>>     >     forwards the resulting packet on the interface to 2.
>>     >
>>     >     2 forwards to 3 along the path to B:3::/32.
>>     >
>>     >     When 3 receives the packet, 3 matches the DA in its "My SID =
Table"
>>     >
>>     >     and finds the bound function End.X to neighbor 4. 3 notes =
the PSP
>>     >
>>     >     capability of the SID B:3:C4::. 3 sets the DA to the next =
SID
>>     >
>>     >     B:8:D100::. As 3 is the penultimate segment hop, it =
performs PSP and
>>     >
>>     >     pops the SRH. 3 forwards the resulting packet to 4.
>>     >
>>     >     4, 6 and 7 forwards along the path to B:8::/32.
>>     >
>>     >    When 8 receives the packet, 8 matches the DA in its "My SID =
Table"
>>     >
>>     >     and finds the bound function End.DT(100).  As a result, 8 =
decaps the
>>     >
>>     >     outer header, looks up the inner IPv4 DA (20.20.20.20) in =
tenant-100
>>     >
>>     >     IPv4 table, and forward the (inner) IPv4 packet towards =
CE-B.
>>     >
>>     > Node 3 receives the packet SA=3DA:1::, DA=3DB:3:C4::,NH=3DSRH =
followed by SRH
>>     > (B:8:D100::, B:3:C4::; SL=3D1; NH=3D4)
>>     >
>>     > The SID B:3:C4:: is associated with the End.X behavior with PSP =
support.
>>     > Node 3 is going to decrement SL, copy the segment B:8:D100:: =
into the
>>     > IPv6 DA and set the packet=E2=80=99s egress adjacency to J =
(adjacency associated
>>     > with that SID instance). Additionally, (PSP) it will check what =
is the
>>     > SL value in the SRH. If the SL=3D0 it will remove the SRH from =
the packet.
>>     >
>>     > The segment B:3:C4:: is the penultimate SID in the segment list
>>     > <B:3:C4::, B:8:D100::>. Note that the PSP behavior is not =
related to IP
>>     > hops.
>>     >
>>     > Cheers,
>>     >
>>     > Pablo.
>>     >
>>     > *From: *li zhenqiang <li_zhenqiang@hotmail.com>
>>     > *Date: *Thursday, 17 October 2019 at 06:11
>>     > *To: *"Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, Ron =
Bonica
>>     > <rbonica=3D40juniper.net@dmarc.ietf.org>, "spring@ietf.org" =
<spring@ietf.org>
>>     > *Cc: *draft-ietf-spring-srv6-network-programming
>>     > <draft-ietf-spring-srv6-network-programming@ietf.org>
>>     > *Subject: *Re: Re: [spring] =
draft-ietf-spring-srv6-network-programming:
>>     > Section 4.16
>>     >
>>     > Hi Pablo,
>>     >
>>     > I am still confused by the example in section 2.8.1. Node 3 is =
the
>>     > destionation of SID B:3:C4::, why should it behave PSP for this =
SID?
>>     > While for SID B:8:D100::, it is an END.DT4, the PSP behavior is =
not
>>     > defined for this kind of SIDs. Node 3 should not behave PSP for =
SID
>>     > B:8:D100::, neither.  Would you please explain node 3 is the =
penultimate
>>     > segment hop of which node or which segment? Suppose the =
behavior is
>>     > correct, may I know the benifit you gain in this example?
>>     >
>>     > Many Thanks,
>>     >
>>     > Zhenqiang Li
>>     >
>>     > =
------------------------------------------------------------------------
>>     >
>>     > li_zhenqiang@hotmail.com
>>     >
>>     >     *From:*Pablo Camarillo (pcamaril) =
<mailto:pcamaril@cisco.com>
>>     >
>>     >     *Date:* 2019-10-16 00:45
>>     >
>>     >     *To:*li zhenqiang <mailto:li_zhenqiang@hotmail.com>; Ron =
Bonica
>>     >     <mailto:rbonica=3D40juniper.net@dmarc.ietf.org>; =
spring@ietf.org
>>     >     <mailto:spring@ietf.org>
>>     >
>>     >     *CC:*draft-ietf-spring-srv6-network-programming
>>     >     =
<mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
>>     >
>>     >     *Subject:* Re: [spring] =
draft-ietf-spring-srv6-network-programming:
>>     >     Section 4.16
>>     >
>>     >     Li,
>>     >
>>     >     I have replied the technical questions regarding PSP and =
USP in the
>>     >     email thread from one week ago.
>>     >
>>     >     You have not provided any technical concern.
>>     >
>>     >     > =E2=80=9CFurther, the example for PSP in the companion =
doc srv6-net-pgm-illustration is wrong. PSP is used for END.DT4 in the =
companion doc while flavors are only defined for END, END.X and END.T  =
in srv6-network-programming.=E2=80=9D
>>     >
>>     >     The illustration in section 2.8.1 is correct. Please =
re-read it. PSP
>>     >     is used at node 3 together with the End.X behavior.
>>     >
>>     >     Regards,
>>     >
>>     >     Pablo.
>>     >
>>     >     Replies from one week ago:
>>     >
>>     >     =
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c
>>     >
>>     >     =
https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak
>>     >
>>     >     *From: *li zhenqiang <li_zhenqiang@hotmail.com>
>>     >     *Date: *Tuesday, 15 October 2019 at 09:32
>>     >     *To: *Ron Bonica <rbonica=3D40juniper.net@dmarc.ietf.org>,
>>     >     "spring@ietf.org" <spring@ietf.org>
>>     >     *Cc: *draft-ietf-spring-srv6-network-programming
>>     >     <draft-ietf-spring-srv6-network-programming@ietf.org>
>>     >     *Subject: *Re: [spring] =
draft-ietf-spring-srv6-network-programming:
>>     >     Section 4.16
>>     >     *Resent from: *<alias-bounces@ietf.org>
>>     >     *Resent to: *<cf@cisco.com>, <pcamaril@cisco.com>, =
<john@leddy.net>,
>>     >     <daniel.voyer@bell.ca>, =
<satoru.matsushima@g.softbank.co.jp>,
>>     >     <lizhenbin@huawei.com>
>>     >     *Resent date: *Tuesday, 15 October 2019 at 09:32
>>     >
>>     >     I suggest this section be removed from this version until =
the
>>     >     community reaches rough consensus.
>>     >
>>     >     Further, the example for PSP in the companion doc
>>     >     srv6-net-pgm-illustration is wrong. PSP is used for END.DT4 =
in the
>>     >     companion doc while flavors are only defined for END, END.X =
and
>>     >     END.T in srv6-network-programming.
>>     >
>>     >     Best Regards,
>>     >
>>     >     Zhenqiang Li
>>     >
>>     >     =
------------------------------------------------------------------------
>>     >
>>     >     li_zhenqiang@hotmail.com
>>     >
>>     >         *From:*Ron Bonica =
<mailto:rbonica=3D40juniper.net@dmarc.ietf.org>
>>     >
>>     >         *Date:* 2019-10-15 02:42
>>     >
>>     >         *To:*SPRING WG List <mailto:spring@ietf.org>
>>     >
>>     >         *Subject:* [spring] =
draft-ietf-spring-srv6-network-programming:
>>     >         Section 4.16
>>     >
>>     >         Authors,
>>     >
>>     >         Lacking the B.INSERT and T.INSERT functions, can you =
describe a
>>     >         use-case for the PSP and USP flavors of the END, END.X =
and END.T
>>     >         functions?
>>     >
>>     >         Ron
>>     >
>>     >         Juniper Business Use Only
>>     >
>>     >
>>     > _______________________________________________
>>     > spring mailing list
>>     > spring@ietf.org
>>     > https://www.ietf.org/mailman/listinfo/spring
>>     >
>>    =20
>=20
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring


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Thread-Topic: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Subject: Re: [spring] [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Hi Sue,


  1.  Should this SR Policy technology be included in BGP for SR-MPLS



Yes. The path segment for MPLS has been defined in Spring and we need the c=
orresponding work in BGP to build the solutions based on path segments.


  1.  Is this technology a good way to implement the required

Features in BGP?



Yes and do refer to some of the issues pointed in the comments below.



  1.  Is this technology ready for adoption?



I have listed down the issues/concerns below. I believe we need to hear the=
 responses from the authors on them. The WG/chairs can decide whether to re=
quire these changes before or after adoption.



  1.  Do you have any concerns about adopting this technology?



No (subject to clarifications on the comments below).



My apologies for the delay in review and sharing these comments:

https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/


  1.  Sec 3 has the following statement which is incorrect. First the Path =
Segment does not identify the SR Policy and the identifiers of SR Policy ar=
e specified in draft-ietf-spring-segment-routing-policy. What the path segm=
ent does is identify the specific "SR Path(s)" at the tail-end - this is as=
 per draft-ietf-spring-mpls-path-segment. So I think the statement below ne=
eds to be revised.


Also,

   it can be used for identifying an SR candidate path or an SR Policy

   in some use cases if needed.


  1.  The draft proposes to have the ability to encode the Path Segment at =
both the Segment List and Candidate path level. I can understand the signal=
ling at the Segment List level, but not sure why we need it also at the CP =
level? If the same Path Segment needs to be shared across Segment Lists the=
n it can be specified for each of them?


  1.  Sec 3.1. Both the SR-MPLS and SRv6 path segments are being combined h=
ere and I am not sure that is appropriate. Since only the SR-MPLS path segm=
ent document is adopted in WG, we need SPRING WG to evaluate the SRv6 path =
segment. I would suggest to call this "MPLS Path Segment" so that work can =
proceed independently. Down the line, we can introduce another TLV for SRv6=
 Path Segment.



  1.  I would also propose to use the TLV encoding that is similar to https=
://tools.ietf.org/html/draft-ietf-idr-segment-routing-te-policy-07#section-=
2.4.3.2.1 for the MPLS path segment.



  1.  Sec 4.1. The proposed Bidirectional Path sub-TLV is at the CP level. =
So does it indicate a single reverse path SL for all the forward path SLs o=
r can it have multiple SLs? Why not also do this on the per SL level so tha=
t the reverse path matches the forward path where necessary? Otherwise it i=
s not possible to correlate the forward and reverse SLs.



  1.  I am not sure why the parameters like weight is required in the rever=
se path since weight is for load-balancing when steering into the path.



  1.  I think either this draft or perhaps more appropriately the draft-iet=
f-spring-mpls-path-segment better describes the usage of the reverse path l=
ist so that this draft can refer to it. While we are calling this "bidirect=
ional", it is actually the reverse path information. There is nothing like =
traditional bidirectional LSP signalling happening here between the two end=
 points directly. It is something that is provisioned by a controller.



  1.  Please remove all suggested code points from the draft until we have =
IANA allocations for them.


https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment=
/


  1.  Sec 3 has some similar text as below and the comment (1) also applies=
 to it.

it can be used for identifying an SR candidate path or an SR
   Policy defined in [I-D.ietf-spring-segment-routing-policy<https://tools.=
ietf.org/html/draft-li-idr-bgp-ls-sr-policy-path-segment-03#ref-I-D.ietf-sp=
ring-segment-routing-policy>]


  1.  Most of the comments from the previous draft also applies to this one=
 and so I won't repeat them.


  1.  This draft cannot borrow the TLV formats from the one above since in =
BGP-LS we have 2 byte type and 2 byte length. It is required to align inste=
ad with draft-ietf-idr-te-lsp-distribution.



  1.  Please remove all suggested code points from the draft until we have =
IANA allocations for them.

Thanks,
Ketan

From: Idr <idr-bounces@ietf.org> On Behalf Of Susan Hares
Sent: 14 October 2019 23:43
To: 'idr wg' <idr@ietf.org>; 'SPRING WG List' <spring@ietf.org>
Subject: Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.=
txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to=
 10/21/2019]

Greetings IDR and Spring WG

The WG Adoption for the two IDR drafts related to IDR received a level supp=
ort below the threshold to accept this draft into the IDR WG.  There were n=
o objection, but there was simply a low level of response.

This 1 week extension to the Adoption call is to let the members of both th=
e IDR and SPRING WG comment on whether these drafts have matured enough to =
be IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination =
of whether either of these two drafts have enough support to be accepted.

Thank you,  Susan  Hares
IDR co-chair

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt =
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

This begins a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019=
]

  *   draft-li-bgp-ls-sr-policy-path-segment-03.txt and
  *   draft-li-idr-sr-policy-path-segment-01.txt.

You can access these two drafts at the following location:

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment=
/

https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/

The authors have pointed out that the adoption of this
draft since the following  SR-MPLS Path Segment draft has been adopted:

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00

Please consider the following questions in your responses?


  1.  Should this SR Policy technology be included in BGP for SR-MPLS



Spring has adopted the draft, but IDR can provide feedback

to spring about putting this technology in BGP.


  1.  Is this technology a good way to implement the required

Features in BGP?



  1.  Is this technology ready for adoption?



  1.  Do you have any concerns about adopting this technology?



Cheers, Susan Hares

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</head>
<body lang=3D"EN-IN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Hi Sue,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo4"><span lang=3D"EN-US">Should this SR Policy technology be included in =
BGP for SR-MPLS
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Yes. The path segment fo=
r MPLS has been defined in Spring and we need the corresponding work in BGP=
 to build the solutions based on path segments.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo4"><span lang=3D"EN-US">Is this technology a good way to implement the r=
equired
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Features in BGP? <o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Yes and do refer to some=
 of the issues pointed in the comments below.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo4"><span lang=3D"EN-US">Is this technology ready for adoption?
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">I have listed down the i=
ssues/concerns below. I believe we need to hear the responses from the auth=
ors on them. The WG/chairs can decide whether to require these changes befo=
re or after adoption.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<ol style=3D"margin-top:0cm" start=3D"4" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo4"><span lang=3D"EN-US">Do you have any concerns about adopting this tec=
hnology?
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">No (subject to clarifica=
tions on the comments below).<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">My apolog=
ies for the delay in review and sharing these comments:<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-sr-policy-path-segment/">https://datatracker.ietf=
.org/doc/draft-li-idr-sr-policy-path-segment/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l4 level1 =
lfo6"><span style=3D"mso-fareast-language:EN-US">Sec 3 has the following st=
atement which is incorrect. First the Path Segment does not identify the SR=
 Policy and the identifiers of SR Policy
 are specified in draft-ietf-spring-segment-routing-policy. What the path s=
egment does is identify the specific &#8220;SR Path(s)&#8221; at the tail-e=
nd &#8211; this is as per draft-ietf-spring-mpls-path-segment. So I think t=
he statement below needs to be revised.<o:p></o:p></span></li></ol>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<pre><span style=3D"color:black">Also,<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; it can be used for identifyin=
g an SR candidate path or an SR Policy<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; in some use cases if needed.<=
o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l4 level1 =
lfo6"><span style=3D"mso-fareast-language:EN-US">The draft proposes to have=
 the ability to encode the Path Segment at both the Segment List and Candid=
ate path level. I can understand the signalling
 at the Segment List level, but not sure why we need it also at the CP leve=
l? If the same Path Segment needs to be shared across Segment Lists then it=
 can be specified for each of them?
<o:p></o:p></span></li></ol>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l4 level1 =
lfo6"><span style=3D"mso-fareast-language:EN-US">Sec 3.1. Both the SR-MPLS =
and SRv6 path segments are being combined here and I am not sure that is ap=
propriate. Since only the SR-MPLS path
 segment document is adopted in WG, we need SPRING WG to evaluate the SRv6 =
path segment. I would suggest to call this &#8220;MPLS Path Segment&#8221; =
so that work can proceed independently. Down the line, we can introduce ano=
ther TLV for SRv6 Path Segment.<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span style=3D"mso-fareast-language:EN-US"><o=
:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"4" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l4 level1 =
lfo6"><span style=3D"mso-fareast-language:EN-US">I would also propose to us=
e the TLV encoding that is similar to
</span><a href=3D"https://tools.ietf.org/html/draft-ietf-idr-segment-routin=
g-te-policy-07#section-2.4.3.2.1">https://tools.ietf.org/html/draft-ietf-id=
r-segment-routing-te-policy-07#section-2.4.3.2.1</a> for the MPLS path segm=
ent.<span style=3D"mso-fareast-language:EN-US"><o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span style=3D"mso-fareast-language:EN-US"><o=
:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"5" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l4 level1 =
lfo6"><span style=3D"mso-fareast-language:EN-US">Sec 4.1. The proposed Bidi=
rectional Path sub-TLV is at the CP level. So does it indicate a single rev=
erse path SL for all the forward path
 SLs or can it have multiple SLs? Why not also do this on the per SL level =
so that the reverse path matches the forward path where necessary? Otherwis=
e it is not possible to correlate the forward and reverse SLs.<o:p></o:p></=
span></li></ol>
<p class=3D"MsoListParagraph"><span style=3D"mso-fareast-language:EN-US"><o=
:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"6" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l4 level1 =
lfo6"><span style=3D"mso-fareast-language:EN-US">I am not sure why the para=
meters like weight is required in the reverse path since weight is for load=
-balancing when steering into the path.<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span style=3D"mso-fareast-language:EN-US"><o=
:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"7" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l4 level1 =
lfo6"><span style=3D"mso-fareast-language:EN-US">I think either this draft =
or perhaps more appropriately the draft-ietf-spring-mpls-path-segment bette=
r describes the usage of the reverse path
 list so that this draft can refer to it. While we are calling this &#8220;=
bidirectional&#8221;, it is actually the reverse path information. There is=
 nothing like traditional bidirectional LSP signalling happening here betwe=
en the two end points directly. It is something
 that is provisioned by a controller.<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span style=3D"mso-fareast-language:EN-US"><o=
:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"8" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l4 level1 =
lfo6"><span style=3D"mso-fareast-language:EN-US">Please remove all suggeste=
d code points from the draft until we have IANA allocations for them.<o:p><=
/o:p></span></li></ol>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/">https://datatrack=
er.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/</a><o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"a">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l1 level1 =
lfo5"><span style=3D"mso-fareast-language:EN-US">Sec 3 has some similar tex=
t as below and the comment (1) also applies to it.<o:p></o:p></span></li></=
ol>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">it can be used for identifying an SR candidate=
 path or an SR<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; Policy defined in [<a href=3D"htt=
ps://tools.ietf.org/html/draft-li-idr-bgp-ls-sr-policy-path-segment-03#ref-=
I-D.ietf-spring-segment-routing-policy" title=3D"&quot;Segment Routing Poli=
cy Architecture&quot;">I-D.ietf-spring-segment-routing-policy</a>]<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"a">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l1 level1 =
lfo5"><span style=3D"mso-fareast-language:EN-US">Most of the comments from =
the previous draft also applies to this one and so I won&#8217;t repeat the=
m.<o:p></o:p></span></li></ol>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"a">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l1 level1 =
lfo5"><span style=3D"mso-fareast-language:EN-US">This draft cannot borrow t=
he TLV formats from the one above since in BGP-LS we have 2 byte type and 2=
 byte length. It is required to align
 instead with draft-ietf-idr-te-lsp-distribution.<o:p></o:p></span></li></o=
l>
<p class=3D"MsoListParagraph"><span style=3D"mso-fareast-language:EN-US"><o=
:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"4" type=3D"a">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l1 level1 =
lfo5"><span style=3D"mso-fareast-language:EN-US">Please remove all suggeste=
d code points from the draft until we have IANA allocations for them.<o:p><=
/o:p></span></li></ol>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Thanks,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Ketan<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Idr &lt;idr-bounces@ietf.org&gt;
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> 14 October 2019 23:43<br>
<b>To:</b> 'idr wg' &lt;idr@ietf.org&gt;; 'SPRING WG List' &lt;spring@ietf.=
org&gt;<br>
<b>Subject:</b> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segm=
ent-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [1=
0/14 to 10/21/2019]<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Greetin=
gs IDR and Spring WG<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">The WG =
Adoption for the two IDR drafts related to IDR received a level support bel=
ow the threshold to accept this draft into the IDR WG.&nbsp; There were no =
objection, but there was simply a low level
 of response. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">This 1 =
week extension to the Adoption call is to let the members of both the IDR a=
nd SPRING WG comment on whether these drafts have matured enough to be IDR =
WG drafts. &nbsp;On 10/21/2019, the IDR chairs
 will make a determination of whether either of these two drafts have enoug=
h support to be accepted.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thank y=
ou,&nbsp; Susan&nbsp; Hares<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">IDR co-=
chair <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif"> Id=
r [<a href=3D"mailto:idr-bounces@ietf.org">mailto:idr-bounces@ietf.org</a>]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, September 17, 2019 12:35 PM<br>
<b>To:</b> 'idr wg'<br>
<b>Subject:</b> [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-=
03.txt and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This begins a 2 week WG Adoptio=
n call two related drafts [9/17 to 10/1/2019]
<o:p></o:p></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:2.25pt;mso-list:l3 leve=
l1 lfo2"><span lang=3D"EN-US">draft-li-bgp-ls-sr-policy-path-segment-03.txt=
 and
<o:p></o:p></span></li><li class=3D"MsoListParagraph" style=3D"margin-left:=
2.25pt;mso-list:l3 level1 lfo2"><span lang=3D"EN-US">draft-li-idr-sr-policy=
-path-segment-01.txt.
<o:p></o:p></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You can access these two drafts=
 at the following location:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/">https://datatrack=
er.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/</a><o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-sr-policy-path-segment/">https://datatracker.ietf=
.org/doc/draft-li-idr-sr-policy-path-segment/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The authors have pointed out th=
at the adoption of this
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">draft since the following &nbsp=
;SR-MPLS Path Segment draft has been adopted:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://tools.ietf.o=
rg/html/draft-ietf-spring-mpls-path-segment-00">https://tools.ietf.org/html=
/draft-ietf-spring-mpls-path-segment-00</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please consider the following q=
uestions in your responses?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l2 level1 =
lfo7"><span lang=3D"EN-US">Should this SR Policy technology be included in =
BGP for SR-MPLS
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Spring has adopted the d=
raft, but IDR can provide feedback
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">to spring about putting =
this technology in BGP.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l2 level1 =
lfo7"><span lang=3D"EN-US">Is this technology a good way to implement the r=
equired
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Features in BGP? <o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l2 level1 =
lfo7"><span lang=3D"EN-US">Is this technology ready for adoption?
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<ol style=3D"margin-top:0cm" start=3D"4" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l2 level1 =
lfo7"><span lang=3D"EN-US">Do you have any concerns about adopting this tec=
hnology?
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cheers, Susan Hares <o:p></o:p>=
</span></p>
</div>
</body>
</html>

--_000_CY4PR11MB15411996CCC61AE91C257726C16C0CY4PR11MB1541namp_--


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From: "Wanghaibo (Rainsword)" <rainsword.wang@huawei.com>
To: Susan Hares <shares@ndzh.com>, 'idr wg' <idr@ietf.org>, 'SPRING WG List' <spring@ietf.org>
Thread-Topic: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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I have read through both drafts. And I support the WG adoption of them.

Best Regards,
Haibo


From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, October 15, 2019 2:13 AM
To: 'idr wg' <idr@ietf.org>; 'SPRING WG List' <spring@ietf.org>
Subject: Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.=
txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to=
 10/21/2019]

Greetings IDR and Spring WG

The WG Adoption for the two IDR drafts related to IDR received a level supp=
ort below the threshold to accept this draft into the IDR WG.  There were n=
o objection, but there was simply a low level of response.

This 1 week extension to the Adoption call is to let the members of both th=
e IDR and SPRING WG comment on whether these drafts have matured enough to =
be IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination =
of whether either of these two drafts have enough support to be accepted.

Thank you,  Susan  Hares
IDR co-chair

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt =
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

This begins a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019=
]

*         draft-li-bgp-ls-sr-policy-path-segment-03.txt and

*         draft-li-idr-sr-policy-path-segment-01.txt.

You can access these two drafts at the following location:

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment=
/

https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/

The authors have pointed out that the adoption of this
draft since the following  SR-MPLS Path Segment draft has been adopted:

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00

Please consider the following questions in your responses?


1)      Should this SR Policy technology be included in BGP for SR-MPLS



Spring has adopted the draft, but IDR can provide feedback

to spring about putting this technology in BGP.


2)      Is this technology a good way to implement the required

Features in BGP?



3)      Is this technology ready for adoption?



4)      Do you have any concerns about adopting this technology?



Cheers, Susan Hares

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</head>
<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">I have =
read through both drafts. And I support the WG adoption of them.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Best Re=
gards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Haibo<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Idr [mailto:idr-bounces@ietf.org]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, October 15, 2019 2:13 AM<br>
<b>To:</b> 'idr wg' &lt;idr@ietf.org&gt;; 'SPRING WG List' &lt;spring@ietf.=
org&gt;<br>
<b>Subject:</b> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segm=
ent-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [1=
0/14 to 10/21/2019]<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Greetin=
gs IDR and Spring WG<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">The WG =
Adoption for the two IDR drafts related to IDR received a level support bel=
ow the threshold to accept this draft into the IDR WG.&nbsp; There were no =
objection, but there was simply a low level
 of response. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">This 1 =
week extension to the Adoption call is to let the members of both the IDR a=
nd SPRING WG comment on whether these drafts have matured enough to be IDR =
WG drafts. &nbsp;On 10/21/2019, the IDR chairs
 will make a determination of whether either of these two drafts have enoug=
h support to be accepted.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thank y=
ou,&nbsp; Susan&nbsp; Hares<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">IDR co-=
chair <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif"> Id=
r [<a href=3D"mailto:idr-bounces@ietf.org">mailto:idr-bounces@ietf.org</a>]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, September 17, 2019 12:35 PM<br>
<b>To:</b> 'idr wg'<br>
<b>Subject:</b> [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-=
03.txt and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This begins a 2 week WG Adoptio=
n call two related drafts [9/17 to 10/1/2019]
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.25pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">draft-li-bgp-ls-sr-poli=
cy-path-segment-03.txt and
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.25pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times N=
ew Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">draft-li-idr-sr-policy-=
path-segment-01.txt.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You can access these two drafts=
 at the following location:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/">https://datatrack=
er.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/</a><o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-sr-policy-path-segment/">https://datatracker.ietf=
.org/doc/draft-li-idr-sr-policy-path-segment/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The authors have pointed out th=
at the adoption of this
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">draft since the following &nbsp=
;SR-MPLS Path Segment draft has been adopted:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://tools.ietf.o=
rg/html/draft-ietf-spring-mpls-path-segment-00">https://tools.ietf.org/html=
/draft-ietf-spring-mpls-path-segment-00</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please consider the following q=
uestions in your responses?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">1)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Should this SR Policy t=
echnology be included in BGP for SR-MPLS
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Spring has adopted the d=
raft, but IDR can provide feedback
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">to spring about putting =
this technology in BGP.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">2)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Is this technology a go=
od way to implement the required
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Features in BGP? <o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">3)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Is this technology read=
y for adoption?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">4)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Do you have any concern=
s about adopting this technology?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cheers, Susan Hares <o:p></o:p>=
</span></p>
</div>
</body>
</html>

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From: "Chengli (Cheng Li)" <chengli13@huawei.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, Susan Hares <shares@ndzh.com>, 'idr wg' <idr@ietf.org>, 'SPRING WG List' <spring@ietf.org>
Thread-Topic: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Hi Katen,

Many thanks for your valuable comments, will update the drafts to address t=
hem ASAP. Please see my rely inline.

Thank you again!
Cheng


From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Ketan Talaulikar (keta=
nt)
Sent: Friday, October 18, 2019 1:51 PM
To: Susan Hares <shares@ndzh.com>; 'idr wg' <idr@ietf.org>; 'SPRING WG List=
' <spring@ietf.org>
Subject: Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.=
txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to=
 10/21/2019]

Hi Sue,

1)      Should this SR Policy technology be included in BGP for SR-MPLS



Yes. The path segment for MPLS has been defined in Spring and we need the c=
orresponding work in BGP to build the solutions based on path segments.

2)      Is this technology a good way to implement the required

Features in BGP?



Yes and do refer to some of the issues pointed in the comments below.


3)      Is this technology ready for adoption?



I have listed down the issues/concerns below. I believe we need to hear the=
 responses from the authors on them. The WG/chairs can decide whether to re=
quire these changes before or after adoption.


4)      Do you have any concerns about adopting this technology?



No (subject to clarifications on the comments below).



My apologies for the delay in review and sharing these comments:

https://datatracker.ietf..org/doc/draft-li-idr-sr-policy-path-segment/<http=
s://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/>

1)      Sec 3 has the following statement which is incorrect. First the Pat=
h Segment does not identify the SR Policy and the identifiers of SR Policy =
are specified in draft-ietf-spring-segment-routing-policy. What the path se=
gment does is identify the specific "SR Path(s)" at the tail-end - this is =
as per draft-ietf-spring-mpls-path-segment. So I think the statement below =
needs to be revised.


Also,

   it can be used for identifying an SR candidate path or an SR Policy

   in some use cases if needed.



                    [Cheng] You are correct! Will address it later.

2)      The draft proposes to have the ability to encode the Path Segment a=
t both the Segment List and Candidate path level. I can understand the sign=
alling at the Segment List level, but not sure why we need it also at the C=
P level? If the same Path Segment needs to be shared across Segment Lists t=
hen it can be specified for each of them?

[Cheng] We aim to provide the capabilities, but your suggestion is right. T=
hey can be specified for each of them. Let's discuss which one is better la=
ter.

3)      Sec 3.1. Both the SR-MPLS and SRv6 path segments are being combined=
 here and I am not sure that is appropriate. Since only the SR-MPLS path se=
gment document is adopted in WG, we need SPRING WG to evaluate the SRv6 pat=
h segment. I would suggest to call this "MPLS Path Segment" so that work ca=
n proceed independently. Down the line, we can introduce another TLV for SR=
v6 Path Segment.



[Cheng] You are right. Do we have any SRv6 related text in the drafts? I re=
member I have removed it. Will check again.


4)      I would also propose to use the TLV encoding that is similar to htt=
ps://tools.ietf.org/html/draft-ietf-idr-segment-routing-te-policy-07#sectio=
n-2.4.3.2.1 for the MPLS path segment.
[Cheng] Agree. We designed the TLV format to draft-ietf-idr-segment-routing=
-te-policy at the first day. Will update to align again.


5)      Sec 4.1. The proposed Bidirectional Path sub-TLV is at the CP level=
. So does it indicate a single reverse path SL for all the forward path SLs=
 or can it have multiple SLs? Why not also do this on the per SL level so t=
hat the reverse path matches the forward path where necessary? Otherwise it=
 is not possible to correlate the forward and reverse SLs.
[Cheng] We plan to update this in the next revision. Right now, we do not s=
upport to have multiple SID lists, which means per SID list level. That is =
why we need to add weight TLV into the  Bidirectional Path sub-TLV as I men=
tioned in my previous email.
                We can discuss on this to design to better solution of supp=
orting multiple SID lists for bidirectional path.

6)      I am not sure why the parameters like weight is required in the rev=
erse path since weight is for load-balancing when steering into the path.
[Cheng ] For 1:1 correlation, we don't need weight TLV, should discuss more=
 on this.


7)      I think either this draft or perhaps more appropriately the draft-i=
etf-spring-mpls-path-segment better describes the usage of the reverse path=
 list so that this draft can refer to it. While we are calling this "bidire=
ctional", it is actually the reverse path information. There is nothing lik=
e traditional bidirectional LSP signalling happening here between the two e=
nd points directly. It is something that is provisioned by a controller.
[Cheng] OK, will do.


8)      Please remove all suggested code points from the draft until we hav=
e IANA allocations for them.
[Cheng] OK

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment=
/

a)      Sec 3 has some similar text as below and the comment (1) also appli=
es to it.

it can be used for identifying an SR candidate path or an SR
   Policy defined in [I-D.ietf-spring-segment-routing-policy<https://tools.=
ietf.org/html/draft-li-idr-bgp-ls-sr-policy-path-segment-03#ref-I-D.ietf-sp=
ring-segment-routing-policy>]
[Cheng] ACK

b)      Most of the comments from the previous draft also applies to this o=
ne and so I won't repeat them.

c)       This draft cannot borrow the TLV formats from the one above since =
in BGP-LS we have 2 byte type and 2 byte length. It is required to align in=
stead with draft-ietf-idr-te-lsp-distribution.
[Cheng] Sure. Will make that in the next revision. Last time we aligned wit=
h draft-ietf-idr-te-lsp-distribution-08, and then the TLV formats were upda=
ted, so we should sync up again.


d)      Please remove all suggested code points from the draft until we hav=
e IANA allocations for them.
[Cheng] ACK

Many thanks! Thank you for your comments, it will definitely help to improv=
e the document and my skills of writing drafts. Thanks!


Thanks,
Ketan

From: Idr <idr-bounces@ietf.org<mailto:idr-bounces@ietf.org>> On Behalf Of =
Susan Hares
Sent: 14 October 2019 23:43
To: 'idr wg' <idr@ietf.org<mailto:idr@ietf.org>>; 'SPRING WG List' <spring@=
ietf.org<mailto:spring@ietf.org>>
Subject: Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.=
txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to=
 10/21/2019]

Greetings IDR and Spring WG

The WG Adoption for the two IDR drafts related to IDR received a level supp=
ort below the threshold to accept this draft into the IDR WG.  There were n=
o objection, but there was simply a low level of response.

This 1 week extension to the Adoption call is to let the members of both th=
e IDR and SPRING WG comment on whether these drafts have matured enough to =
be IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination =
of whether either of these two drafts have enough support to be accepted.

Thank you,  Susan  Hares
IDR co-chair

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt =
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

This begins a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019=
]
*         draft-li-bgp-ls-sr-policy-path-segment-03.txt and
*         draft-li-idr-sr-policy-path-segment-01.txt.

You can access these two drafts at the following location:

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment=
/

https://datatracker.ietf..org/doc/draft-li-idr-sr-policy-path-segment/<http=
s://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/>

The authors have pointed out that the adoption of this
draft since the following  SR-MPLS Path Segment draft has been adopted:

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00

Please consider the following questions in your responses?

1)      Should this SR Policy technology be included in BGP for SR-MPLS



Spring has adopted the draft, but IDR can provide feedback

to spring about putting this technology in BGP.

2)      Is this technology a good way to implement the required

Features in BGP?


3)      Is this technology ready for adoption?


4)      Do you have any concerns about adopting this technology?



Cheers, Susan Hares

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Katen, <o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Many thanks for your v=
aluable comments, will update the drafts to address them ASAP. Please see m=
y rely inline.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thank you again!<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cheng<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Idr [mailto:idr-bounces@ietf.org] <b>On=
 Behalf Of
</b>Ketan Talaulikar (ketant)<br>
<b>Sent:</b> Friday, October 18, 2019 1:51 PM<br>
<b>To:</b> Susan Hares &lt;shares@ndzh.com&gt;; 'idr wg' &lt;idr@ietf.org&g=
t;; 'SPRING WG List' &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segm=
ent-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [1=
0/14 to 10/21/2019]<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">Hi Sue,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"mso-list:Ignore">1)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Should this SR Policy technology be included in BGP=
 for SR-MPLS
<o:p></o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph">Yes. The path segment for MPLS has been defin=
ed in Spring and we need the corresponding work in BGP to build the solutio=
ns based on path segments.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"mso-list:Ignore">2)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Is this technology a good way to implement the requ=
ired <o:p>
</o:p></p>
<p class=3D"MsoListParagraph">Features in BGP? <o:p></o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph">Yes and do refer to some of the issues pointe=
d in the comments below.<o:p></o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"mso-list:Ignore">3)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Is this technology ready for adoption? <o:p></o:p><=
/p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph">I have listed down the issues/concerns below.=
 I believe we need to hear the responses from the authors on them. The WG/c=
hairs can decide whether to require these changes before or after adoption.=
<o:p></o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"mso-list:Ignore">4)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do you have any concerns about adopting this techno=
logy? <o:p>
</o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph">No (subject to clarifications on the comments=
 below).<o:p></o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">My apologies for the delay in review and sharing these comments:<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><a href=3D"https://datatracker.ietf.org/doc/draft-li=
-idr-sr-policy-path-segment/">https://datatracker.ietf..org/doc/draft-li-id=
r-sr-policy-path-segment/</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l4 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">1)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">Sec 3 has the following statement which is incorrect. First t=
he Path Segment does not identify the SR Policy and the identifiers of SR P=
olicy are specified in draft-ietf-spring-segment-routing-policy.
 What the path segment does is identify the specific &#8220;SR Path(s)&#822=
1; at the tail-end &#8211; this is as per draft-ietf-spring-mpls-path-segme=
nt. So I think the statement below needs to be revised.<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"EN-IN" style=3D"color:black">Also,<o:p></o:p></span></pr=
e>
<pre><span lang=3D"EN-IN" style=3D"color:black">&nbsp;&nbsp; it can be used=
 for identifying an SR candidate path or an SR Policy<o:p></o:p></span></pr=
e>
<pre><span lang=3D"EN-IN" style=3D"color:black">&nbsp;&nbsp; in some use ca=
ses if needed.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
[Cheng] You are correct! Will address it later.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l4 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">2)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">The draft proposes to have the ability to encode the Path Seg=
ment at both the Segment List and Candidate path level. I can understand th=
e signalling at the Segment List level,
 but not sure why we need it also at the CP level? If the same Path Segment=
 needs to be shared across Segment Lists then it can be specified for each =
of them?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:18.0pt"><span lang=3D"EN-IN" st=
yle=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng] We aim to provide =
the capabilities, but your suggestion is right. They can be specified for e=
ach of them. Let&#8217;s discuss which one is
 better later.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l4 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">3)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">Sec 3.1. Both the SR-MPLS and SRv6 path segments are being co=
mbined here and I am not sure that is appropriate. Since only the SR-MPLS p=
ath segment document is adopted in WG,
 we need SPRING WG to evaluate the SRv6 path segment. I would suggest to ca=
ll this &#8220;MPLS Path Segment&#8221; so that work can proceed independen=
tly. Down the line, we can introduce another TLV for SRv6 Path Segment.<o:p=
></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-IN" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:0cm;text-indent:18.0pt">=
<span lang=3D"EN-IN" style=3D"color:#1F497D;mso-fareast-language:EN-US">[Ch=
eng] You are right. Do we have any SRv6 related text in the drafts? I remem=
ber I have removed it. Will check again.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:0cm"><span lang=3D"EN-IN=
" style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l4 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">4)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">I would also propose to use the TLV encoding that is similar =
to
</span><a href=3D"https://tools.ietf.org/html/draft-ietf-idr-segment-routin=
g-te-policy-07#section-2.4.3.2.1"><span lang=3D"EN-IN">https://tools.ietf.o=
rg/html/draft-ietf-idr-segment-routing-te-policy-07#section-2.4.3.2.1</span=
></a><span lang=3D"EN-IN"> for the MPLS
 path segment.</span><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:18.0pt"><span lang=3D"EN-IN" st=
yle=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng] Agree. We designed=
 the TLV format to draft-ietf-idr-segment-routing-te-policy at the first da=
y. Will update to align again.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-IN" style=3D"mso-fareast-lan=
guage:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l4 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">5)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">Sec 4.1. The proposed Bidirectional Path sub-TLV is at the CP=
 level. So does it indicate a single reverse path SL for all the forward pa=
th SLs or can it have multiple SLs?
 Why not also do this on the per SL level so that the reverse path matches =
the forward path where necessary? Otherwise it is not possible to correlate=
 the forward and reverse SLs.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:18.0pt"><span lang=3D"EN-IN" st=
yle=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng] We plan to update =
this in the next revision. Right now, we do not support to have multiple SI=
D lists, which means per SID list level.
 That is why we need to add weight TLV into the &nbsp;Bidirectional Path su=
b-TLV as I mentioned in my previous email.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; We can discuss on this to design to bet=
ter solution of supporting multiple SID lists for bidirectional path.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l4 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">6)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">I am not sure why the parameters like weight is required in t=
he reverse path since weight is for load-balancing when steering into the p=
ath.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:18.0pt"><span lang=3D"EN-IN" st=
yle=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng ] For 1:1 correlati=
on, we don&#8217;t need weight TLV, should discuss more on this.<o:p></o:p>=
</span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-IN" style=3D"mso-fareast-lan=
guage:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l4 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">7)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">I think either this draft or perhaps more appropriately the d=
raft-ietf-spring-mpls-path-segment better describes the usage of the revers=
e path list so that this draft can refer
 to it. While we are calling this &#8220;bidirectional&#8221;, it is actual=
ly the reverse path information. There is nothing like traditional bidirect=
ional LSP signalling happening here between the two end points directly. It=
 is something that is provisioned by a controller.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:18.0pt;text-indent:18.0pt"><spa=
n lang=3D"EN-IN" style=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng]=
 OK, will do.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-IN" style=3D"mso-fareast-lan=
guage:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l4 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">8)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">Please remove all suggested code points from the draft until =
we have IANA allocations for them.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:18.0pt;text-indent:18.0pt"><spa=
n lang=3D"EN-IN" style=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng]=
 OK<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><a href=3D"https://datatracker.ietf.org/doc/draft-li=
-idr-bgp-ls-sr-policy-path-segment/">https://datatracker.ietf.org/doc/draft=
-li-idr-bgp-ls-sr-policy-path-segment/</a><o:p></o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l1 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">Sec 3 has some similar text as below and the comment (1) also=
 applies to it.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:black">it can be used for identifying =
an SR candidate path or an SR<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; Policy defined in =
[</span><a href=3D"https://tools.ietf.org/html/draft-li-idr-bgp-ls-sr-polic=
y-path-segment-03#ref-I-D.ietf-spring-segment-routing-policy" title=3D"&quo=
t;Segment Routing Policy Architecture&quot;"><span lang=3D"EN-IN" style=3D"=
font-size:10.0pt;font-family:&quot;Courier New&quot;">I-D.ietf-spring-segme=
nt-routing-policy</span></a><span lang=3D"EN-IN" style=3D"font-size:10.0pt;=
font-family:&quot;Courier New&quot;;color:black">]<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:18.0pt;text-indent:18.0pt"><spa=
n lang=3D"EN-IN" style=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng]=
 ACK<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l1 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">Most of the comments from the previous draft also applies to =
this one and so I won&#8217;t repeat them.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l1 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">c)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">This draft cannot borrow the TLV formats from the one above s=
ince in BGP-LS we have 2 byte type and 2 byte length. It is required to ali=
gn instead with draft-ietf-idr-te-lsp-distribution.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:18.0pt;text-indent:18.0pt"><spa=
n lang=3D"EN-IN" style=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng]=
 Sure. Will make that in the next revision. Last time we aligned with draft=
-ietf-idr-te-lsp-distribution-08, and then
 the TLV formats were updated, so we should sync up again.<o:p></o:p></span=
></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-IN" style=3D"mso-fareast-lan=
guage:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l1 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">d)<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-IN" style=3D"mso-fareast-la=
nguage:EN-US">Please remove all suggested code points from the draft until =
we have IANA allocations for them.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:18.0pt"><span lang=3D"EN-IN" st=
yle=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng] ACK<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Many thanks! Thank you for your comments, it will defin=
itely help to improve the document and my skills of writing drafts. Thanks!=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">Ketan<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Idr &lt;<a href=3D"mailto:idr-bounces@i=
etf.org">idr-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> 14 October 2019 23:43<br>
<b>To:</b> 'idr wg' &lt;<a href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&gt=
;; 'SPRING WG List' &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org<=
/a>&gt;<br>
<b>Subject:</b> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segm=
ent-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [1=
0/14 to 10/21/2019]<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-IN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Greetings IDR and Spri=
ng WG<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">The WG Adoption for th=
e two IDR drafts related to IDR received a level support below the threshol=
d to accept this draft into the IDR WG.&nbsp; There were no objection, but =
there was simply a low level of response.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">This 1 week extension =
to the Adoption call is to let the members of both the IDR and SPRING WG co=
mment on whether these drafts have matured enough to be IDR WG drafts. &nbs=
p;On 10/21/2019, the IDR chairs will make
 a determination of whether either of these two drafts have enough support =
to be accepted.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thank you,&nbsp; Susan=
&nbsp; Hares<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">IDR co-chair <o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,sans-serif">From:</span></b><span style=3D"font-size:10.0pt;f=
ont-family:&quot;Tahoma&quot;,sans-serif"> Idr [</span><a href=3D"mailto:id=
r-bounces@ietf.org"><span style=3D"font-size:10.0pt;font-family:&quot;Tahom=
a&quot;,sans-serif">mailto:idr-bounces@ietf.org</span></a><span style=3D"fo=
nt-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif">]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, September 17, 2019 12:35 PM<br>
<b>To:</b> 'idr wg'<br>
<b>Subject:</b> [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-=
03.txt and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This begins a 2 week WG Adoption call two related dr=
afts [9/17 to 10/1/2019]
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:38.25pt;text-indent:-18.0pt;mso=
-list:l3 level1 lfo8">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>draft-li-bgp-ls-sr-policy-path-segment-03.tx=
t and <o:p>
</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:38.25pt;text-indent:-18.0pt;mso=
-list:l3 level1 lfo8">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso-=
list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>draft-li-idr-sr-policy-path-segment-01.txt. =
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">You can access these two drafts at the following loc=
ation: <o:p>
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://datatracker.ietf.org/doc/draft-li=
-idr-bgp-ls-sr-policy-path-segment/">https://datatracker.ietf.org/doc/draft=
-li-idr-bgp-ls-sr-policy-path-segment/</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://datatracker.ietf.org/doc/draft-li=
-idr-sr-policy-path-segment/">https://datatracker.ietf..org/doc/draft-li-id=
r-sr-policy-path-segment/</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The authors have pointed out that the adoption of th=
is <o:p>
</o:p></p>
<p class=3D"MsoNormal">draft since the following &nbsp;SR-MPLS Path Segment=
 draft has been adopted:
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://tools.ietf.org/html/draft-ietf-sp=
ring-mpls-path-segment-00">https://tools.ietf.org/html/draft-ietf-spring-mp=
ls-path-segment-00</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please consider the following questions in your resp=
onses? <o:p>
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l2 level1 lfo10">
<![if !supportLists]><span style=3D"mso-list:Ignore">1)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Should this SR Policy technology be included in BGP=
 for SR-MPLS
<o:p></o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph">Spring has adopted the draft, but IDR can pro=
vide feedback
<o:p></o:p></p>
<p class=3D"MsoListParagraph">to spring about putting this technology in BG=
P.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l2 level1 lfo10">
<![if !supportLists]><span style=3D"mso-list:Ignore">2)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Is this technology a good way to implement the requ=
ired <o:p>
</o:p></p>
<p class=3D"MsoListParagraph">Features in BGP? <o:p></o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l2 level1 lfo10">
<![if !supportLists]><span style=3D"mso-list:Ignore">3)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Is this technology ready for adoption? <o:p></o:p><=
/p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l2 level1 lfo10">
<![if !supportLists]><span style=3D"mso-list:Ignore">4)<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do you have any concerns about adopting this techno=
logy? <o:p>
</o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Cheers, Susan Hares <o:p></o:p></p>
</div>
</body>
</html>

--_000_C7C2E1C43D652C4E9E49FE7517C236CB0274933Fdggeml529mbxchi_--


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Chengli (Cheng Li)" <chengli13@huawei.com>, Susan Hares <shares@ndzh.com>, "'idr wg'" <idr@ietf.org>, "'SPRING WG List'" <spring@ietf.org>
Thread-Topic: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Subject: Re: [spring] [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Hi Cheng,

Thanks for your quick responses and acknowledgement of the changes suggeste=
d. Based on your responses, I have no strong views on the parts which can (=
or need to) be incorporated before adoption and which can be done post adop=
tion.

We can continue to discuss and address the outstanding topics as suggested =
by you.

Thanks,
Ketan

From: Chengli (Cheng Li) <chengli13@huawei.com>
Sent: 18 October 2019 12:35
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; Susan Hares <shares@ndzh.=
com>; 'idr wg' <idr@ietf.org>; 'SPRING WG List' <spring@ietf.org>
Subject: RE: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.=
txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to=
 10/21/2019]

Hi Katen,

Many thanks for your valuable comments, will update the drafts to address t=
hem ASAP. Please see my rely inline.

Thank you again!
Cheng


From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Ketan Talaulikar (keta=
nt)
Sent: Friday, October 18, 2019 1:51 PM
To: Susan Hares <shares@ndzh.com<mailto:shares@ndzh.com>>; 'idr wg' <idr@ie=
tf.org<mailto:idr@ietf.org>>; 'SPRING WG List' <spring@ietf.org<mailto:spri=
ng@ietf.org>>
Subject: Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.=
txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to=
 10/21/2019]

Hi Sue,


  1.  Should this SR Policy technology be included in BGP for SR-MPLS



Yes. The path segment for MPLS has been defined in Spring and we need the c=
orresponding work in BGP to build the solutions based on path segments.


  1.  Is this technology a good way to implement the required

Features in BGP?



Yes and do refer to some of the issues pointed in the comments below.



  1.  Is this technology ready for adoption?



I have listed down the issues/concerns below. I believe we need to hear the=
 responses from the authors on them. The WG/chairs can decide whether to re=
quire these changes before or after adoption.



  1.  Do you have any concerns about adopting this technology?



No (subject to clarifications on the comments below).



My apologies for the delay in review and sharing these comments:

https://datatracker.ietf..org/doc/draft-li-idr-sr-policy-path-segment/<http=
s://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/>


  1.  Sec 3 has the following statement which is incorrect. First the Path =
Segment does not identify the SR Policy and the identifiers of SR Policy ar=
e specified in draft-ietf-spring-segment-routing-policy. What the path segm=
ent does is identify the specific "SR Path(s)" at the tail-end - this is as=
 per draft-ietf-spring-mpls-path-segment. So I think the statement below ne=
eds to be revised.


Also,

   it can be used for identifying an SR candidate path or an SR Policy

   in some use cases if needed.



                    [Cheng] You are correct! Will address it later.


  1.  The draft proposes to have the ability to encode the Path Segment at =
both the Segment List and Candidate path level. I can understand the signal=
ling at the Segment List level, but not sure why we need it also at the CP =
level? If the same Path Segment needs to be shared across Segment Lists the=
n it can be specified for each of them?

[Cheng] We aim to provide the capabilities, but your suggestion is right. T=
hey can be specified for each of them. Let's discuss which one is better la=
ter.


  1.  Sec 3.1. Both the SR-MPLS and SRv6 path segments are being combined h=
ere and I am not sure that is appropriate. Since only the SR-MPLS path segm=
ent document is adopted in WG, we need SPRING WG to evaluate the SRv6 path =
segment. I would suggest to call this "MPLS Path Segment" so that work can =
proceed independently. Down the line, we can introduce another TLV for SRv6=
 Path Segment.



[Cheng] You are right. Do we have any SRv6 related text in the drafts? I re=
member I have removed it. Will check again.



  1.  I would also propose to use the TLV encoding that is similar to https=
://tools.ietf.org/html/draft-ietf-idr-segment-routing-te-policy-07#section-=
2.4.3.2.1 for the MPLS path segment.
[Cheng] Agree. We designed the TLV format to draft-ietf-idr-segment-routing=
-te-policy at the first day. Will update to align again.



  1.  Sec 4.1. The proposed Bidirectional Path sub-TLV is at the CP level. =
So does it indicate a single reverse path SL for all the forward path SLs o=
r can it have multiple SLs? Why not also do this on the per SL level so tha=
t the reverse path matches the forward path where necessary? Otherwise it i=
s not possible to correlate the forward and reverse SLs.
[Cheng] We plan to update this in the next revision. Right now, we do not s=
upport to have multiple SID lists, which means per SID list level. That is =
why we need to add weight TLV into the  Bidirectional Path sub-TLV as I men=
tioned in my previous email.
                We can discuss on this to design to better solution of supp=
orting multiple SID lists for bidirectional path.


  1.  I am not sure why the parameters like weight is required in the rever=
se path since weight is for load-balancing when steering into the path.
[Cheng ] For 1:1 correlation, we don't need weight TLV, should discuss more=
 on this.



  1.  I think either this draft or perhaps more appropriately the draft-iet=
f-spring-mpls-path-segment better describes the usage of the reverse path l=
ist so that this draft can refer to it. While we are calling this "bidirect=
ional", it is actually the reverse path information. There is nothing like =
traditional bidirectional LSP signalling happening here between the two end=
 points directly. It is something that is provisioned by a controller.
[Cheng] OK, will do.



  1.  Please remove all suggested code points from the draft until we have =
IANA allocations for them.
[Cheng] OK

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment=
/


  1.  Sec 3 has some similar text as below and the comment (1) also applies=
 to it.

it can be used for identifying an SR candidate path or an SR
   Policy defined in [I-D.ietf-spring-segment-routing-policy<https://tools.=
ietf.org/html/draft-li-idr-bgp-ls-sr-policy-path-segment-03#ref-I-D.ietf-sp=
ring-segment-routing-policy>]
[Cheng] ACK


  1.  Most of the comments from the previous draft also applies to this one=
 and so I won't repeat them.


  1.  This draft cannot borrow the TLV formats from the one above since in =
BGP-LS we have 2 byte type and 2 byte length. It is required to align inste=
ad with draft-ietf-idr-te-lsp-distribution.
[Cheng] Sure. Will make that in the next revision. Last time we aligned wit=
h draft-ietf-idr-te-lsp-distribution-08, and then the TLV formats were upda=
ted, so we should sync up again.



  1.  Please remove all suggested code points from the draft until we have =
IANA allocations for them.
[Cheng] ACK

Many thanks! Thank you for your comments, it will definitely help to improv=
e the document and my skills of writing drafts. Thanks!


Thanks,
Ketan

From: Idr <idr-bounces@ietf.org<mailto:idr-bounces@ietf.org>> On Behalf Of =
Susan Hares
Sent: 14 October 2019 23:43
To: 'idr wg' <idr@ietf.org<mailto:idr@ietf.org>>; 'SPRING WG List' <spring@=
ietf.org<mailto:spring@ietf.org>>
Subject: Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.=
txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to=
 10/21/2019]

Greetings IDR and Spring WG

The WG Adoption for the two IDR drafts related to IDR received a level supp=
ort below the threshold to accept this draft into the IDR WG.  There were n=
o objection, but there was simply a low level of response.

This 1 week extension to the Adoption call is to let the members of both th=
e IDR and SPRING WG comment on whether these drafts have matured enough to =
be IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination =
of whether either of these two drafts have enough support to be accepted.

Thank you,  Susan  Hares
IDR co-chair

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt =
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

This begins a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019=
]

  *   draft-li-bgp-ls-sr-policy-path-segment-03.txt and
  *   draft-li-idr-sr-policy-path-segment-01.txt.

You can access these two drafts at the following location:

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment=
/

https://datatracker.ietf..org/doc/draft-li-idr-sr-policy-path-segment/<http=
s://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/>

The authors have pointed out that the adoption of this
draft since the following  SR-MPLS Path Segment draft has been adopted:

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00

Please consider the following questions in your responses?


  1.  Should this SR Policy technology be included in BGP for SR-MPLS



Spring has adopted the draft, but IDR can provide feedback

to spring about putting this technology in BGP.


  1.  Is this technology a good way to implement the required

Features in BGP?



  1.  Is this technology ready for adoption?



  1.  Do you have any concerns about adopting this technology?



Cheers, Susan Hares

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</head>
<body lang=3D"EN-IN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Hi Cheng,=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Thanks fo=
r your quick responses and acknowledgement of the changes suggested. Based =
on your responses, I have no strong views on the parts which can (or need t=
o) be incorporated before adoption and
 which can be done post adoption. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">We can co=
ntinue to discuss and address the outstanding topics as suggested by you.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Thanks,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Ketan<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Chengli (Cheng Li) &lt;chengli13@huawei.com&gt;
<br>
<b>Sent:</b> 18 October 2019 12:35<br>
<b>To:</b> Ketan Talaulikar (ketant) &lt;ketant@cisco.com&gt;; Susan Hares =
&lt;shares@ndzh.com&gt;; 'idr wg' &lt;idr@ietf.org&gt;; 'SPRING WG List' &l=
t;spring@ietf.org&gt;<br>
<b>Subject:</b> RE: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segm=
ent-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [1=
0/14 to 10/21/2019]<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Hi Kate=
n, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Many th=
anks for your valuable comments, will update the drafts to address them ASA=
P. Please see my rely inline.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thank y=
ou again!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Cheng<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Idr [<a href=3D"mailto:idr-bounces@ietf.org">mailto:idr-bounces=
@ietf.org</a>]
<b>On Behalf Of </b>Ketan Talaulikar (ketant)<br>
<b>Sent:</b> Friday, October 18, 2019 1:51 PM<br>
<b>To:</b> Susan Hares &lt;<a href=3D"mailto:shares@ndzh.com">shares@ndzh.c=
om</a>&gt;; 'idr wg' &lt;<a href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&g=
t;; 'SPRING WG List' &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org=
</a>&gt;<br>
<b>Subject:</b> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segm=
ent-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [1=
0/14 to 10/21/2019]<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Hi Sue,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l0 level1 lfo2"><span lang=3D"EN-=
US">Should this SR Policy technology be included in BGP for SR-MPLS
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Yes. The path segment fo=
r MPLS has been defined in Spring and we need the corresponding work in BGP=
 to build the solutions based on path segments.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l0 level1 lfo2"><span lang=3D"EN-=
US">Is this technology a good way to implement the required
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Features in BGP? <o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Yes and do refer to some=
 of the issues pointed in the comments below.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l0 level1 lfo2"><span lang=3D"EN-=
US">Is this technology ready for adoption?
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">I have listed down the i=
ssues/concerns below. I believe we need to hear the responses from the auth=
ors on them. The WG/chairs can decide whether to require these changes befo=
re or after adoption.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<ol style=3D"margin-top:0cm" start=3D"4" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l0 level1 lfo2"><span lang=3D"EN-=
US">Do you have any concerns about adopting this technology?
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">No (subject to clarifica=
tions on the comments below).<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">My apolog=
ies for the delay in review and sharing these comments:<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-sr-policy-path-segment/">https://datatracker.ietf=
..org/doc/draft-li-idr-sr-policy-path-segment/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l4 level1 lfo4"><span style=3D"ms=
o-fareast-language:EN-US">Sec 3 has the following statement which is incorr=
ect. First the Path Segment does not identify the SR Policy and the identif=
iers of SR Policy are specified in draft-ietf-spring-segment-routing-policy=
.
 What the path segment does is identify the specific &#8220;SR Path(s)&#822=
1; at the tail-end &#8211; this is as per draft-ietf-spring-mpls-path-segme=
nt. So I think the statement below needs to be revised.<o:p></o:p></span></=
li></ol>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<pre><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;co=
lor:black">Also,<o:p></o:p></span></pre>
<pre><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;co=
lor:black">&nbsp;&nbsp; it can be used for identifying an SR candidate path=
 or an SR Policy<o:p></o:p></span></pre>
<pre><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;co=
lor:black">&nbsp;&nbsp; in some use cases if needed.<o:p></o:p></span></pre=
>
<pre><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
[Cheng] You are correct! Will address it later.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l4 level1 lfo4"><span style=3D"ms=
o-fareast-language:EN-US">The draft proposes to have the ability to encode =
the Path Segment at both the Segment List and Candidate path level. I can u=
nderstand the signalling at the Segment
 List level, but not sure why we need it also at the CP level? If the same =
Path Segment needs to be shared across Segment Lists then it can be specifi=
ed for each of them?
<o:p></o:p></span></li></ol>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:18.0pt"><span style=3D"color:#1=
F497D;mso-fareast-language:EN-US">[Cheng] We aim to provide the capabilitie=
s, but your suggestion is right. They can be specified for each of them. Le=
t&#8217;s discuss which one is better later.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l4 level1 lfo4"><span style=3D"ms=
o-fareast-language:EN-US">Sec 3.1. Both the SR-MPLS and SRv6 path segments =
are being combined here and I am not sure that is appropriate. Since only t=
he SR-MPLS path segment document is adopted
 in WG, we need SPRING WG to evaluate the SRv6 path segment. I would sugges=
t to call this &#8220;MPLS Path Segment&#8221; so that work can proceed ind=
ependently. Down the line, we can introduce another TLV for SRv6 Path Segme=
nt.<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:0cm;text-indent:18.0pt">=
<span style=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng] You are ri=
ght. Do we have any SRv6 related text in the drafts? I remember I have remo=
ved it. Will check again.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:0cm"><span style=3D"colo=
r:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"4" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l4 level1 lfo4"><span style=3D"ms=
o-fareast-language:EN-US">I would also propose to use the TLV encoding that=
 is similar to
</span><span lang=3D"EN-US"><a href=3D"https://tools.ietf.org/html/draft-ie=
tf-idr-segment-routing-te-policy-07#section-2.4.3.2.1"><span lang=3D"EN-IN"=
>https://tools.ietf.org/html/draft-ietf-idr-segment-routing-te-policy-07#se=
ction-2.4.3.2.1</span></a></span> for
 the MPLS path segment.<span style=3D"mso-fareast-language:EN-US"><o:p></o:=
p></span></li></ol>
<p class=3D"MsoNormal" style=3D"text-indent:18.0pt"><span style=3D"color:#1=
F497D;mso-fareast-language:EN-US">[Cheng] Agree. We designed the TLV format=
 to draft-ietf-idr-segment-routing-te-policy at the first day. Will update =
to align again.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span style=3D"mso-fareast-language:EN-US"><o=
:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"5" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l4 level1 lfo4"><span style=3D"ms=
o-fareast-language:EN-US">Sec 4.1. The proposed Bidirectional Path sub-TLV =
is at the CP level. So does it indicate a single reverse path SL for all th=
e forward path SLs or can it have multiple
 SLs? Why not also do this on the per SL level so that the reverse path mat=
ches the forward path where necessary? Otherwise it is not possible to corr=
elate the forward and reverse SLs.<o:p></o:p></span></li></ol>
<p class=3D"MsoNormal" style=3D"text-indent:18.0pt"><span style=3D"color:#1=
F497D;mso-fareast-language:EN-US">[Cheng] We plan to update this in the nex=
t revision. Right now, we do not support to have multiple SID lists, which =
means per SID list level. That is why
 we need to add weight TLV into the &nbsp;Bidirectional Path sub-TLV as I m=
entioned in my previous email.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; We can discuss on this to design to better solution of=
 supporting multiple SID lists for bidirectional path.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"6" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l4 level1 lfo4"><span style=3D"ms=
o-fareast-language:EN-US">I am not sure why the parameters like weight is r=
equired in the reverse path since weight is for load-balancing when steerin=
g into the path.<o:p></o:p></span></li></ol>
<p class=3D"MsoNormal" style=3D"text-indent:18.0pt"><span style=3D"color:#1=
F497D;mso-fareast-language:EN-US">[Cheng ] For 1:1 correlation, we don&#821=
7;t need weight TLV, should discuss more on this.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span style=3D"mso-fareast-language:EN-US"><o=
:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"7" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l4 level1 lfo4"><span style=3D"ms=
o-fareast-language:EN-US">I think either this draft or perhaps more appropr=
iately the draft-ietf-spring-mpls-path-segment better describes the usage o=
f the reverse path list so that this draft
 can refer to it. While we are calling this &#8220;bidirectional&#8221;, it=
 is actually the reverse path information. There is nothing like traditiona=
l bidirectional LSP signalling happening here between the two end points di=
rectly. It is something that is provisioned
 by a controller.<o:p></o:p></span></li></ol>
<p class=3D"MsoNormal" style=3D"margin-left:18.0pt;text-indent:18.0pt"><spa=
n style=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng] OK, will do.<o=
:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span style=3D"mso-fareast-language:EN-US"><o=
:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"8" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l4 level1 lfo4"><span style=3D"ms=
o-fareast-language:EN-US">Please remove all suggested code points from the =
draft until we have IANA allocations for them.<o:p></o:p></span></li></ol>
<p class=3D"MsoNormal" style=3D"margin-left:18.0pt;text-indent:18.0pt"><spa=
n style=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng] OK<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/">https://datatrack=
er.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/</a><o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"a">
<li class=3D"MsoNormal" style=3D"mso-list:l1 level1 lfo6"><span style=3D"ms=
o-fareast-language:EN-US">Sec 3 has some similar text as below and the comm=
ent (1) also applies to it.<o:p></o:p></span></li></ol>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">it can be used for identifying an SR candidate=
 path or an SR<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; Policy defined in [</span><span l=
ang=3D"EN-US"><a href=3D"https://tools.ietf.org/html/draft-li-idr-bgp-ls-sr=
-policy-path-segment-03#ref-I-D.ietf-spring-segment-routing-policy" title=
=3D"&quot;Segment Routing Policy Architecture&quot;"><span lang=3D"EN-IN" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">I-D.ietf-spri=
ng-segment-routing-policy</span></a></span><span style=3D"font-size:10.0pt;=
font-family:&quot;Courier New&quot;;color:black">]<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:18.0pt;text-indent:18.0pt"><spa=
n style=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng] ACK<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"a">
<li class=3D"MsoNormal" style=3D"mso-list:l1 level1 lfo6"><span style=3D"ms=
o-fareast-language:EN-US">Most of the comments from the previous draft also=
 applies to this one and so I won&#8217;t repeat them.<o:p></o:p></span></l=
i></ol>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"a">
<li class=3D"MsoNormal" style=3D"mso-list:l1 level1 lfo6"><span style=3D"ms=
o-fareast-language:EN-US">This draft cannot borrow the TLV formats from the=
 one above since in BGP-LS we have 2 byte type and 2 byte length. It is req=
uired to align instead with draft-ietf-idr-te-lsp-distribution.<o:p></o:p><=
/span></li></ol>
<p class=3D"MsoNormal" style=3D"margin-left:18.0pt;text-indent:18.0pt"><spa=
n style=3D"color:#1F497D;mso-fareast-language:EN-US">[Cheng] Sure. Will mak=
e that in the next revision. Last time we aligned with draft-ietf-idr-te-ls=
p-distribution-08, and then the TLV formats
 were updated, so we should sync up again.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span style=3D"mso-fareast-language:EN-US"><o=
:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"4" type=3D"a">
<li class=3D"MsoNormal" style=3D"mso-list:l1 level1 lfo6"><span style=3D"ms=
o-fareast-language:EN-US">Please remove all suggested code points from the =
draft until we have IANA allocations for them.<o:p></o:p></span></li></ol>
<p class=3D"MsoNormal" style=3D"text-indent:18.0pt"><span style=3D"color:#1=
F497D;mso-fareast-language:EN-US">[Cheng] ACK<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Many thanks! Thank you for your comments, it will definitely help to i=
mprove the document and my skills of writing drafts. Thanks!<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Thanks,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Ketan<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Idr &lt;<a href=3D"mailto:idr-bounces@ietf.org">idr-bounces@iet=
f.org</a>&gt;
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> 14 October 2019 23:43<br>
<b>To:</b> 'idr wg' &lt;<a href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&gt=
;; 'SPRING WG List' &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org<=
/a>&gt;<br>
<b>Subject:</b> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segm=
ent-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [1=
0/14 to 10/21/2019]<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Greetin=
gs IDR and Spring WG<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">The WG =
Adoption for the two IDR drafts related to IDR received a level support bel=
ow the threshold to accept this draft into the IDR WG.&nbsp; There were no =
objection, but there was simply a low level
 of response. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">This 1 =
week extension to the Adoption call is to let the members of both the IDR a=
nd SPRING WG comment on whether these drafts have matured enough to be IDR =
WG drafts. &nbsp;On 10/21/2019, the IDR chairs
 will make a determination of whether either of these two drafts have enoug=
h support to be accepted.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thank y=
ou,&nbsp; Susan&nbsp; Hares<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">IDR co-=
chair <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif"> Id=
r [</span><span lang=3D"EN-US"><a href=3D"mailto:idr-bounces@ietf.org"><spa=
n style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif">mail=
to:idr-bounces@ietf.org</span></a></span><span lang=3D"EN-US" style=3D"font=
-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif">]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, September 17, 2019 12:35 PM<br>
<b>To:</b> 'idr wg'<br>
<b>Subject:</b> [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-=
03.txt and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This begins a 2 week WG Adoptio=
n call two related drafts [9/17 to 10/1/2019]
<o:p></o:p></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoNormal" style=3D"margin-left:2.25pt;mso-list:l3 level1 lfo8=
"><span lang=3D"EN-US">draft-li-bgp-ls-sr-policy-path-segment-03.txt and
<o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"margin-left:2.25pt;=
mso-list:l3 level1 lfo8"><span lang=3D"EN-US">draft-li-idr-sr-policy-path-s=
egment-01.txt.
<o:p></o:p></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">You can access these two drafts=
 at the following location:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/">https://datatrack=
er.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/</a><o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-li-idr-sr-policy-path-segment/">https://datatracker.ietf=
..org/doc/draft-li-idr-sr-policy-path-segment/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The authors have pointed out th=
at the adoption of this
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">draft since the following &nbsp=
;SR-MPLS Path Segment draft has been adopted:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://tools.ietf.o=
rg/html/draft-ietf-spring-mpls-path-segment-00">https://tools.ietf.org/html=
/draft-ietf-spring-mpls-path-segment-00</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please consider the following q=
uestions in your responses?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l2 level1 lfo10"><span lang=3D"EN=
-US">Should this SR Policy technology be included in BGP for SR-MPLS
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Spring has adopted the d=
raft, but IDR can provide feedback
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">to spring about putting =
this technology in BGP.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<ol style=3D"margin-top:0cm" start=3D"2" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l2 level1 lfo10"><span lang=3D"EN=
-US">Is this technology a good way to implement the required
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">Features in BGP? <o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<ol style=3D"margin-top:0cm" start=3D"3" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l2 level1 lfo10"><span lang=3D"EN=
-US">Is this technology ready for adoption?
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<ol style=3D"margin-top:0cm" start=3D"4" type=3D"1">
<li class=3D"MsoNormal" style=3D"mso-list:l2 level1 lfo10"><span lang=3D"EN=
-US">Do you have any concerns about adopting this technology?
<o:p></o:p></span></li></ol>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cheers, Susan Hares <o:p></o:p>=
</span></p>
</div>
</body>
</html>

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From: Rajesh M <mrajesh@juniper.net>
To: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>
Thread-Topic: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/T8XTds6tO98vHo8h_PREvI1D2N0>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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--_000_MN2PR05MB60806B43DBD4D38910CBB1E3BE6C0MN2PR05MB6080namp_
Content-Type: text/plain; charset="iso-2022-jp"
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I was more focused towards END.DT4 SID where behavior you mentioned is poss=
ible only if we do below optimization in https://tools.ietf.org/html/draft-=
dawra-bess-srv6-services-02<https://urldefense.com/v3/__https:/tools.ietf.o=
rg/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1w=
jCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$>  section 3.

when the received route is colored with an extended color community 'C' and=
 Next-Hop 'N', and the ingress PE has a valid SRv6 Policy (C, N) associated=
 with SID list <S1,S2, S3>, then the effective SR Policy is <S1, S2, SRv6-S=
ervice-SID>.Here if you see
S3 and SRv6-Service-SID both belong to Egress so s3 has been removed.


For you my query is removing only SRH header on PHP router will give what k=
ind of advantage ?

Thanks
Rajesh





Juniper Business Use Only
From: spring <spring-bounces@ietf.org> On Behalf Of Wang, Weibin (NSB - CN/=
Shanghai)
Sent: Friday, October 18, 2019 9:26 AM
To: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org>; Pablo Camarillo (pca=
maril) <pcamaril@cisco.com>; SPRING WG List <spring@ietf.org>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

The value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent =
the last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 =
node copy IPv6 SID corresponding to [SL]=3D0 to DA field of IP packet, when=
 enable PSP flavor at same time, the penultimate SRv6 node will check the [=
SL] value, if it is 0, then pop SRH, these extra action is pseudocode of PS=
P. This logic has no problem.


--------------------------------------
Cheers !


WANG Weibin

From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Rajesh M
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 6:38
To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.co=
m>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

WANG had given below use case : But using existing PSP logic this will not =
work.
In below at PSP router updated SL will be 1 (since END.DT4 is still there) =
,so SRH pop won=1B$B!G=1B(Bt happen.



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }

WANG use case:
=1B$B!H=1B(BFor example in SRv6-based L3VPN service scenario, The ingress P=
E within SRv6-enabled domain can utilize SR-TE policy to enable TE-path fun=
ction when encapsulating and transiting L3VPN traffic, The Ingress PE push =
on customer packets with SID list representing SR-TE policy plus END.DT4 as=
 last SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be design=
ed to perform in related SRv6 endpoint. Imaging the PSP, the penultimate En=
dpoint can perform PSP, e.g. copy the last SID (END.DT4) of SRH to destinat=
ion field of IPv6 header and POP the SRH, then forwarding it toward egress =
PE identified by DA=1B$B!I=1B(B







Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.=
.com>>
Sent: Tuesday, October 15, 2019 10:13 PM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; SPRING WG L=
ist <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>

Rajesh,

This has already been replied less than one week ago.. Please see:
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0Zpj=
VLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7HGIr9o9$>
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tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzR=
ZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7P8QaU_7$>

Thanks,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D=
40juniper.net@dmarc.ietf.org>>
Date: Friday, 11 October 2019 at 03:47
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>, Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-networ=
k-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.org/=
html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c=
!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>


Wanted to know the use case where we only POP the SRH ?

4.16.1<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-sp=
ring-srv6-network-programming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31=
cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$>..  PSP: Penultimat=
e Segment Pop of the SRH

   The SRH processing of the End, End.X and End.T behaviors are

   modified: after the instruction "S14.  Update IPv6 DA with Segment

   List[Segments Left]" is executed, the following instructions must be

   executed as well:



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }



Juniper Business Use Only

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">I was mor=
e focused towards END.DT4 SID where behavior you mentioned is possible only=
 if we do below optimization in
</span><a href=3D"https://urldefense.com/v3/__https:/tools.ietf.org/html/dr=
aft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1wjCRKLg4MMb=
WlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$">https://tools.ietf.org/html/draft-da=
wra-bess-srv6-services-02</a>&nbsp; section
 3.<span style=3D"mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">when the received route is colored with an extended color =
community 'C' and Next-Hop 'N', and the ingress PE has a valid SRv6 Policy =
(C, N) associated with SID list &lt;S1,S2, S3&gt;, then
 the effective SR Policy is &lt;S1, S2, SRv6-Service-SID&gt;.Here if you se=
e <o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red">S3 and SRv6-Service-SID both belong to Egress=
 so s3 has been removed.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red">For you my query is removing only SRH header =
on PHP router will give what kind of advantage ?<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">Thanks<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">Rajesh<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;spring-bounces@ietf.org&gt; =
<b>On Behalf Of
</b>Wang, Weibin (NSB - CN/Shanghai)<br>
<b>Sent:</b> Friday, October 18, 2019 9:26 AM<br>
<b>To:</b> Rajesh M &lt;mrajesh=3D40juniper.net@dmarc.ietf.org&gt;; Pablo C=
amarillo (pcamaril) &lt;pcamaril@cisco.com&gt;; SPRING WG List &lt;spring@i=
etf.org&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;<br>
<b>Subject:</b> Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-=
srv6-network-programming-04#page-24<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">The value of Segmen=
t Left field in SRH begin with 0, so [SL]=3D0 represent the last SID. in th=
is case, when [SL] decrease 1, and the penultimate SRv6 node copy IPv6 SID =
corresponding to [SL]=3D0 to DA field of
 IP packet, when enable PSP flavor at same time, the penultimate SRv6 node =
will check the [SL] value, if it is 0, then pop SRH, these extra action is =
pseudocode of PSP. This logic has no problem.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt">------------------------------------=
--<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans=
-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">WANG Weibin&nbsp;
</span></b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roma=
n&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 2019<span lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft =
YaHei&quot;,sans-serif">=1B$BG/=1B(B</span>10<span lang=3D"ZH-CN" style=3D"=
font-family:&quot;Microsoft YaHei&quot;,sans-serif">=1B$B7n=1B(B</span>18<s=
pan lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-se=
rif">=1B$BF|=1B(B</span> 6:38<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.=
com">pcamaril@cisco.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:sprin=
g@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">WANG had given below use case : But using existing P=
SP logic this will not work.<o:p></o:p></p>
<p class=3D"MsoNormal">In below at PSP router updated SL will be 1 (since E=
ND.DT4 is still there) ,so SRH pop won=1B$B!G=1B(Bt happen.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">WANG use case:<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white">=1B$B!H=1B(BFor example in SRv6-based L3VPN se=
rvice scenario, The ingress PE within SRv6-enabled domain can utilize SR-TE=
 policy to enable TE-path function when encapsulating
 and transiting L3VPN traffic, The Ingress PE push on customer packets with=
 SID list representing SR-TE policy plus END.DT4 as last SRv6 SID in SRH; S=
o I think, each flavor of PSP/USP/USD can be designed to perform in related=
 SRv6 endpoint. Imaging the PSP,
 the penultimate Endpoint can perform PSP, e.g. copy the last SID (END.DT4)=
 of SRH to destination field of IPv6 header and POP the SRH, then forwardin=
g it toward egress PE identified by DA=1B$B!I=1B(B<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;<a href=
=3D"mailto:pcamaril@cisco..com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 10:13 PM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spri=
ng@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3k=
DJQnV$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Rajesh,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This has already been replied less than one week ago=
.. Please see:
<o:p></o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://urldefense.com/v3/__https:/mailar=
chive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W=
8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7HGIr9o9$">https://m=
ailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c</a><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES"><a href=3D"https://urldefense.com/=
v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfa=
k__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P=
8QaU_7$"><span lang=3D"EN-US">https://mailarchive.ietf.org/arch/msg/spring/=
WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span lang=3D"ES" styl=
e=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Friday, 11 October 2019 at 03:47<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc: </b>Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;, Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject: </b>[spring] <a href=3D"https://urldefense.com/v3/__https:/tool=
s.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!=
8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQn=
V$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">Wanted to know the use ca=
se where we only POP the SRH ?<o:p></o:p></span></pre>
<h4 style=3D"margin-left:.5in"><span lang=3D"ES"><a href=3D"https://urldefe=
nse.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-prog=
ramming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIh=
uJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$">4.16.1</a></span><a name=3D"section-4.16=
..1"></a><span lang=3D"ES" style=3D"font-family:&quot;Courier New&quot;">..=
&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><span lang=3D"ES"><o:p></o:p=
></span></h4>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; The SRH proc=
essing of the End, End.X and End.T behaviors are<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; modified: af=
ter the instruction &quot;S14.&nbsp; Update IPv6 DA with Segment<o:p></o:p>=
</span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; List[Segment=
s Left]&quot; is executed, the following instructions must be<o:p></o:p></s=
pan></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; executed as =
well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<o:p></o:p></span><=
/pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
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From: "Rakesh Gandhi (rgandhi)" <rgandhi@cisco.com>
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Thread-Topic: [spring] [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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From: Tom Herbert <tom@herbertland.com>
Date: Fri, 18 Oct 2019 08:28:59 -0700
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To: Fred Baker <fredbaker.ietf@gmail.com>
Cc: Lizhenbin <lizhenbin@huawei.com>, "spring@ietf.org" <spring@ietf.org>,  "ipv6@ietf.org" <ipv6@ietf.org>, "v6ops@ietf.org" <v6ops@ietf.org>, Clarence Filsfils <cfilsfil@cisco.com>,  Satoru Matsushima <satoru.matsushima@g.softbank.co.jp>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/WQxTr-MrMU1HOn2EGbdph5xLMHM>
Subject: Re: [spring] New Version Notification for draft-matsushima-spring-srv6-deployment-status-02.txt
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On Thu, Oct 17, 2019 at 4:53 PM Fred Baker <fredbaker.ietf@gmail.com> wrote=
:
>
>
>
> > On Oct 17, 2019, at 5:30 AM, Lizhenbin <lizhenbin@huawei.com> wrote:
> >
> > In the past two years, China pushed the IPv6 deployment and almost all =
the IP networks of operators achieve the goal "IPv6 Ready". This provide a =
strong base for SRv6 deployments which can help operators provide new servi=
ces based on IPv6 infrastructure.
>
> With respect, I would suggest that before we push for SRv6 deployment, we=
 develop and SRv6 use case that IPv6 doesn't support. My perception is that=
 SRv6 is a solution looking for a problem.

A related question can be asked. Section 9 of
draft-ietf-6man-segment-routing-header-25 shows that SRH TLVs and SRH
HMAC have not been implemented, except for HMAC in Linux which
probably doesn't conform to the latest draft. Given there's no
implementation, then it's logical to assume there's no deployment of
these and none of deployment in
draft-matsushima-spring-srv6-deployment-status-02 use these (that
draft does not even mention TLVs) . Nevertheless, TLVs and HMAC are a
major part of SRH and 6man has exerted quite a bit of effort working
on these.

What is the use case for SR TLVs and HMAC? Why are these use cases not
already supported in IPv6 by HBH options, Destination options, or
Authentication Header?

Tom

> --------------------------------------------------------------------
> IETF IPv6 working group mailing list
> ipv6@ietf.org
> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
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Date: Fri, 18 Oct 2019 13:52:45 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Hirofumi Ichihara <ichihara.hirofumi@gmail.com>
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Hello Hirofumi,

Many thanks for sharing the use case.
Reading your slides, it looks like completely host based overlay design, =
e.g. no fabric switch is SRv6 aware, not using any of SRv6 functionality =
(TE, IP=46RR, etc) and their solely function is to forward traffic toward=
s destinations of remote hosts over L3 IP fabric=3F In case of link/node =
failure it would use fast-rehash over ECMP rather that TI-L=46A=3F

Thanks in advance=21

Cheers,
Jeff
On Oct 17, 2019, 6:30 PM -0700, Hirofumi Ichihara <ichihara.hirofumi=40gm=
ail.com>, wrote:
> Hi,
>
> Let me introduce LINE's SRv6 DC use case as well. We have already deplo=
yed SRv6 network with our private cloud on production environment. Please=
 have a look at this slide( https://speakerdeck.com/line=5Fdevelopers/lin=
e-data-center-networking-with-srv6=C2=A0) if you're interested in our use=
 case. And also we're interested in other DC use cases and implementation=
s.. Please let me know if you have such information.
>
> Thanks,
> Hirofumi
>
>
> > 2019=E5=B9=B410=E6=9C=8817=E6=97=A5(=E6=9C=A8) 21:31 Lizhenbin <lizhe=
nbin=40huawei.com>:
> > > Hi =46olks,
> > > We updated the SRv6 deployment draft as follows. There are two new =
deployments of SRv6 from China for reference:
> > > China Unicom and CERNET2. In the past two years, China pushed the I=
Pv6 deployment and almost all the IP networks
> > > of operators achieve the goal =22IPv6 Ready=22. This provide a stro=
ng base for SRv6 deployments which can help operators
> > > provide new services based on IPv6 infrastructure. Moreover the eas=
y incremental deployment advantage of SRv6 (refer
> > > to https://tools.ietf.org/html/draft-xie-spring-srv6-network-migrat=
ion-00 ) facilitates the SRv6 deployments in the existing
> > > network. Besides the SRv6 deployments proposed in the draft, there =
will be more SRv6 for different application scenariosin
> > > the near future. These SRv6 deployments=C2=A0 are also promoting th=
e IPv6 deployment and more IPv6 traffic will be beared by
> > > these networks.
> > >
> > >
> > >
> > > Best Regards,
> > > Robin
> > >
> > >
> > >
> > > =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
> > > =E5=8F=91=E4=BB=B6=E4=BA=BA: internet-drafts=40ietf.org =5Binternet=
-drafts=40ietf.org=5D
> > > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=
=97=A5 11:15
> > > =E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence =46ilsfils; Lizhen=
bin; Satoru Matsushima
> > > =E4=B8=BB=E9=A2=98: New Version Notification for draft-matsushima-s=
pring-srv6-deployment-status-02.txt
> > >
> > > A new version of I-D, draft-matsushima-spring-srv6-deployment-statu=
s-02.txt
> > > has been successfully submitted by Zafar Ali and posted to the
> > > IET=46 repository.
> > >
> > > Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-matsushima-spri=
ng-srv6-deployment-status
> > > Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A002
> > > Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 SRv6 Implementation and De=
ployment Status
> > > Document date:=C2=A0 2019-10-14
> > > Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission
> > > Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 19
> > > URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/=
internet-drafts/draft-matsushima-spring-srv6-deployment-status-02.txt
> > > Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://datatracker.ietf.o=
rg/doc/draft-matsushima-spring-srv6-deployment-status/
> > > Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://tools.ietf.org/html/dra=
ft-matsushima-spring-srv6-deployment-status-02
> > > Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://datatracker.ietf.org/do=
c/html/draft-matsushima-spring-srv6-deployment-status
> > > Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://www.ietf.org/=
rfcdiff=3Furl2=3Ddraft-matsushima-spring-srv6-deployment-status-02
> > >
> > > Abstract:
> > > =C2=A0 =C2=A0This draft provides an overview of IPv6 Segment Routin=
g (SRv6)
> > > =C2=A0 =C2=A0deployment status.=C2=A0 It lists various SRv6 feature=
s that have been
> > > =C2=A0 =C2=A0deployed in the production networks.=C2=A0 It also pro=
vides an overview of
> > > =C2=A0 =C2=A0SRv6 implementation and interoperability testing statu=
s.
> > >
> > >
> > >
> > >
> > >
> > > Please note that it may take a couple of minutes from the time of s=
ubmission
> > > until the htmlized version and diff are available at tools.ietf.org=
.
> > >
> > > The IET=46 Secretariat
> > > -------------------------------------------------------------------=
-
> > > IET=46 IPv6 working group mailing list
> > > ipv6=40ietf.org
> > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6=

> > > -------------------------------------------------------------------=
-
> --------------------------------------------------------------------
> IET=46 IPv6 working group mailing list
> ipv6=40ietf.org
> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> --------------------------------------------------------------------

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Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

<html xmlns=3D=22http://www.w3.org/1999/xhtml=22>
<head>
<title></title>
</head>
<body>
<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>Hello Hirofumi,
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>Many thanks for sharing the use case.</div>
<div dir=3D=22auto=22>Reading your slides, it looks like completely host =
based overlay design, e.g. no fabric switch is SRv6 aware, not using any =
of SRv6 functionality (TE, IP=46RR, etc) and their solely function is to =
forward traffic towards destinations of remote hosts over L3 IP fabric=3F=
 In case of link/node failure it would use fast-rehash over ECMP rather t=
hat TI-L=46A=3F</div>
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>Thanks in advance=21<br /></div>
</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Oct 17, 2019, 6:30 PM -0700, Hir=
ofumi Ichihara &lt;ichihara.hirofumi=40gmail.com&gt;, wrote:<br />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =231abc9c;=22>
<div dir=3D=22ltr=22>
<div dir=3D=22ltr=22>Hi,
<div><br /></div>
<div>Let me introduce LINE's SRv6 DC use case as well. We have already de=
ployed SRv6 network with our private cloud on production environment. Ple=
ase have a look at this slide( <a href=3D=22https://speakerdeck.com/line=5F=
developers/line-data-center-networking-with-srv6=22>https://speakerdeck.c=
om/line=5Fdevelopers/line-data-center-networking-with-srv6</a>&=23160;) i=
f you're interested in our use case. And also we're interested in other D=
C use cases and implementations.. Please let me know if you have such inf=
ormation.</div>
<div><br /></div>
<div>Thanks,</div>
<div>Hirofumi</div>
<div><br /></div>
</div>
</div>
<br />
<div class=3D=22gmail=5Fquote=22>
<div dir=3D=22ltr=22 class=3D=22gmail=5Fattr=22>2019=E5=B9=B410=E6=9C=881=
7=E6=97=A5(=E6=9C=A8) 21:31 Lizhenbin &lt;<a href=3D=22mailto:lizhenbin=40=
huawei.com=22>lizhenbin=40huawei.com</a>&gt;:<br /></div>
<blockquote class=3D=22gmail=5Fquote spark=5Fquote=22 style=3D=22margin: =
5px 5px; padding-left: 10px; border-left: thin solid =23e67e22;=22>Hi =46=
olks,<br />
We updated the SRv6 deployment draft as follows. There are two new deploy=
ments of SRv6 from China for reference:<br />
China Unicom and CERNET2. In the past two years, China pushed the IPv6 de=
ployment and almost all the IP networks<br />
of operators achieve the goal =22IPv6 Ready=22. This provide a strong bas=
e for SRv6 deployments which can help operators<br />
provide new services based on IPv6 infrastructure. Moreover the easy incr=
emental deployment advantage of SRv6 (refer<br />
to <a href=3D=22https://tools.ietf.org/html/draft-xie-spring-srv6-network=
-migration-00=22 rel=3D=22noreferrer=22 target=3D=22=5Fblank=22>https://t=
ools.ietf.org/html/draft-xie-spring-srv6-network-migration-00</a> ) facil=
itates the SRv6 deployments in the existing<br />
network. Besides the SRv6 deployments proposed in the draft, there will b=
e more SRv6 for different application scenariosin<br />
the near future. These SRv6 deployments&=23160; are also promoting the IP=
v6 deployment and more IPv6 traffic will be beared by<br />
these networks.&=23160;<br />
<br />
<br />
<br />
Best Regards,<br />
Robin<br />
<br />
<br />
<br />
=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<br />
=E5=8F=91=E4=BB=B6=E4=BA=BA: <a href=3D=22mailto:internet-drafts=40ietf.o=
rg=22 target=3D=22=5Fblank=22>internet-drafts=40ietf.org</a> =5B<a href=3D=
=22mailto:internet-drafts=40ietf.org=22 target=3D=22=5Fblank=22>internet-=
drafts=40ietf.org</a>=5D<br />
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=A5=
 11:15<br />
=E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence =46ilsfils; Lizhenbin; S=
atoru Matsushima<br />
=E4=B8=BB=E9=A2=98: New Version Notification for draft-matsushima-spring-=
srv6-deployment-status-02.txt<br />
<br />
A new version of I-D, draft-matsushima-spring-srv6-deployment-status-02.t=
xt<br />
has been successfully submitted by Zafar Ali and posted to the<br />
IET=46 repository.<br />
<br />
Name:&=23160; &=23160; &=23160; &=23160; &=23160; &=23160;draft-matsushim=
a-spring-srv6-deployment-status<br />
Revision:&=23160; &=23160; &=23160; &=23160;02<br />
Title:&=23160; &=23160; &=23160; &=23160; &=23160; SRv6 Implementation an=
d Deployment Status<br />
Document date:&=23160; 2019-10-14<br />
Group:&=23160; &=23160; &=23160; &=23160; &=23160; Individual Submission<=
br />
Pages:&=23160; &=23160; &=23160; &=23160; &=23160; 19<br />
URL:&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; <a href=3D=22ht=
tps://www.ietf.org/internet-drafts/draft-matsushima-spring-srv6-deploymen=
t-status-02.txt=22 rel=3D=22noreferrer=22 target=3D=22=5Fblank=22>https:/=
/www.ietf.org/internet-drafts/draft-matsushima-spring-srv6-deployment-sta=
tus-02.txt</a><br />
Status:&=23160; &=23160; &=23160; &=23160; &=23160;<a href=3D=22https://d=
atatracker.ietf.org/doc/draft-matsushima-spring-srv6-deployment-status/=22=
 rel=3D=22noreferrer=22 target=3D=22=5Fblank=22>https://datatracker.ietf.=
org/doc/draft-matsushima-spring-srv6-deployment-status/</a><br />
Htmlized:&=23160; &=23160; &=23160; &=23160;<a href=3D=22https://tools.ie=
tf.org/html/draft-matsushima-spring-srv6-deployment-status-02=22 rel=3D=22=
noreferrer=22 target=3D=22=5Fblank=22>https://tools.ietf.org/html/draft-m=
atsushima-spring-srv6-deployment-status-02</a><br />
Htmlized:&=23160; &=23160; &=23160; &=23160;<a href=3D=22https://datatrac=
ker.ietf.org/doc/html/draft-matsushima-spring-srv6-deployment-status=22 r=
el=3D=22noreferrer=22 target=3D=22=5Fblank=22>https://datatracker.ietf.or=
g/doc/html/draft-matsushima-spring-srv6-deployment-status</a><br />
Diff:&=23160; &=23160; &=23160; &=23160; &=23160; &=23160;<a href=3D=22ht=
tps://www.ietf.org/rfcdiff=3Furl2=3Ddraft-matsushima-spring-srv6-deployme=
nt-status-02=22 rel=3D=22noreferrer=22 target=3D=22=5Fblank=22>https://ww=
w.ietf.org/rfcdiff=3Furl2=3Ddraft-matsushima-spring-srv6-deployment-statu=
s-02</a><br />
<br />
Abstract:<br />
&=23160; &=23160;This draft provides an overview of IPv6 Segment Routing =
(SRv6)<br />
&=23160; &=23160;deployment status.&=23160; It lists various SRv6 feature=
s that have been<br />
&=23160; &=23160;deployed in the production networks.&=23160; It also pro=
vides an overview of<br />
&=23160; &=23160;SRv6 implementation and interoperability testing status.=
<br />
<br />
<br />
<br />
<br />
<br />
Please note that it may take a couple of minutes from the time of submiss=
ion<br />
until the htmlized version and diff are available at <a href=3D=22http://=
tools.ietf.org=22 rel=3D=22noreferrer=22 target=3D=22=5Fblank=22>tools.ie=
tf.org</a>.<br />
<br />
The IET=46 Secretariat<br />
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>
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From: Robert Raszuk <robert@raszuk.net>
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Hi Jeff,

> In case of link/node failure it would use fast-rehash over ECMP rather
that TI-LFA?

Do you think that this is a good idea to consider using TI-LFA in a Clos
fabric ?

Thx,
R.

On Fri, Oct 18, 2019 at 10:53 PM Jeff Tantsura <jefftant.ietf@gmail.com>
wrote:

> Hello Hirofumi,
>
> Many thanks for sharing the use case.
> Reading your slides, it looks like completely host based overlay design,
> e.g. no fabric switch is SRv6 aware, not using any of SRv6 functionality
> (TE, IPFRR, etc) and their solely function is to forward traffic towards
> destinations of remote hosts over L3 IP fabric? In case of link/node
> failure it would use fast-rehash over ECMP rather that TI-LFA?
>
> Thanks in advance!
>
> Cheers,
> Jeff
> On Oct 17, 2019, 6:30 PM -0700, Hirofumi Ichihara <
> ichihara.hirofumi@gmail.com>, wrote:
>
> Hi,
>
> Let me introduce LINE's SRv6 DC use case as well. We have already deploye=
d
> SRv6 network with our private cloud on production environment. Please hav=
e
> a look at this slide(
> https://speakerdeck.com/line_developers/line-data-center-networking-with-=
srv6 )
> if you're interested in our use case. And also we're interested in other =
DC
> use cases and implementations.. Please let me know if you have such
> information.
>
> Thanks,
> Hirofumi
>
>
> 2019=E5=B9=B410=E6=9C=8817=E6=97=A5(=E6=9C=A8) 21:31 Lizhenbin <lizhenbin=
@huawei.com>:
>
>> Hi Folks,
>> We updated the SRv6 deployment draft as follows. There are two new
>> deployments of SRv6 from China for reference:
>> China Unicom and CERNET2. In the past two years, China pushed the IPv6
>> deployment and almost all the IP networks
>> of operators achieve the goal "IPv6 Ready". This provide a strong base
>> for SRv6 deployments which can help operators
>> provide new services based on IPv6 infrastructure. Moreover the easy
>> incremental deployment advantage of SRv6 (refer
>> to https://tools.ietf.org/html/draft-xie-spring-srv6-network-migration-0=
0
>> ) facilitates the SRv6 deployments in the existing
>> network. Besides the SRv6 deployments proposed in the draft, there will
>> be more SRv6 for different application scenariosin
>> the near future. These SRv6 deployments  are also promoting the IPv6
>> deployment and more IPv6 traffic will be beared by
>> these networks.
>>
>>
>>
>> Best Regards,
>> Robin
>>
>>
>>
>> ________________________________________
>> =E5=8F=91=E4=BB=B6=E4=BA=BA: internet-drafts@ietf.org [internet-drafts@i=
etf.org]
>> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=
=A5 11:15
>> =E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence Filsfils; Lizhenbin; Sa=
toru Matsushima
>> =E4=B8=BB=E9=A2=98: New Version Notification for
>> draft-matsushima-spring-srv6-deployment-status-02.txt
>>
>> A new version of I-D,
>> draft-matsushima-spring-srv6-deployment-status-02.txt
>> has been successfully submitted by Zafar Ali and posted to the
>> IETF repository.
>>
>> Name:           draft-matsushima-spring-srv6-deployment-status
>> Revision:       02
>> Title:          SRv6 Implementation and Deployment Status
>> Document date:  2019-10-14
>> Group:          Individual Submission
>> Pages:          19
>> URL:
>> https://www.ietf.org/internet-drafts/draft-matsushima-spring-srv6-deploy=
ment-status-02.txt
>> Status:
>> https://datatracker.ietf.org/doc/draft-matsushima-spring-srv6-deployment=
-status/
>> Htmlized:
>> https://tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-stat=
us-02
>> Htmlized:
>> https://datatracker.ietf.org/doc/html/draft-matsushima-spring-srv6-deplo=
yment-status
>> Diff:
>> https://www.ietf.org/rfcdiff?url2=3Ddraft-matsushima-spring-srv6-deploym=
ent-status-02
>>
>> Abstract:
>>    This draft provides an overview of IPv6 Segment Routing (SRv6)
>>    deployment status.  It lists various SRv6 features that have been
>>    deployed in the production networks.  It also provides an overview of
>>    SRv6 implementation and interoperability testing status.
>>
>>
>>
>>
>>
>> Please note that it may take a couple of minutes from the time of
>> submission
>> until the htmlized version and diff are available at tools.ietf.org.
>>
>> The IETF Secretariat
>> --------------------------------------------------------------------
>> IETF IPv6 working group mailing list
>> ipv6@ietf.org
>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
>> --------------------------------------------------------------------
>>
> --------------------------------------------------------------------
> IETF IPv6 working group mailing list
> ipv6@ietf.org
> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> --------------------------------------------------------------------
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>

--000000000000d72bbd0595359249
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<div dir=3D"ltr">Hi Jeff,<div><br></div><div>&gt; In case of link/node fail=
ure it would use fast-rehash over ECMP rather that TI-LFA?=C2=A0=C2=A0<br><=
/div><div><br></div><div>Do you think that this is a good=C2=A0idea to cons=
ider using TI-LFA in a Clos fabric ?=C2=A0</div><div><br></div><div>Thx,</d=
iv><div>R.</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Fri, Oct 18, 2019 at 10:53 PM Jeff Tantsura &lt;<a href=
=3D"mailto:jefftant.ietf@gmail.com">jefftant.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">



<div>
<div name=3D"messageBodySection">
<div dir=3D"auto">Hello Hirofumi,
<div dir=3D"auto"><br></div>
<div dir=3D"auto">Many thanks for sharing the use case.</div>
<div dir=3D"auto">Reading your slides, it looks like completely host based =
overlay design, e.g. no fabric switch is SRv6 aware, not using any of SRv6 =
functionality (TE, IPFRR, etc) and their solely function is to forward traf=
fic towards destinations of remote hosts over L3 IP fabric? In case of link=
/node failure it would use fast-rehash over ECMP rather that TI-LFA?</div>
<div dir=3D"auto"><br></div>
<div dir=3D"auto">Thanks in advance!<br></div>
</div>
</div>
<div name=3D"messageSignatureSection"><br>
<div>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D"messageReplySection">On Oct 17, 2019, 6:30 PM -0700, Hirofumi =
Ichihara &lt;<a href=3D"mailto:ichihara.hirofumi@gmail.com" target=3D"_blan=
k">ichihara.hirofumi@gmail.com</a>&gt;, wrote:<br>
<blockquote type=3D"cite" style=3D"margin:5px;padding-left:10px;border-left=
:thin solid rgb(26,188,156)">
<div dir=3D"ltr">
<div dir=3D"ltr">Hi,
<div><br></div>
<div>Let me introduce LINE&#39;s SRv6 DC use case as well. We have already =
deployed SRv6 network with our private cloud on production environment. Ple=
ase have a look at this slide( <a href=3D"https://speakerdeck.com/line_deve=
lopers/line-data-center-networking-with-srv6" target=3D"_blank">https://spe=
akerdeck.com/line_developers/line-data-center-networking-with-srv6</a>=C2=
=A0) if you&#39;re interested in our use case. And also we&#39;re intereste=
d in other DC use cases and implementations.. Please let me know if you hav=
e such information.</div>
<div><br></div>
<div>Thanks,</div>
<div>Hirofumi</div>
<div><br></div>
</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">2019=E5=B9=B410=E6=9C=8817=E6=97=A5(=
=E6=9C=A8) 21:31 Lizhenbin &lt;<a href=3D"mailto:lizhenbin@huawei.com" targ=
et=3D"_blank">lizhenbin@huawei.com</a>&gt;:<br></div>
<blockquote class=3D"gmail_quote" style=3D"margin:5px;padding-left:10px;bor=
der-left:thin solid rgb(230,126,34)">Hi Folks,<br>
We updated the SRv6 deployment draft as follows. There are two new deployme=
nts of SRv6 from China for reference:<br>
China Unicom and CERNET2. In the past two years, China pushed the IPv6 depl=
oyment and almost all the IP networks<br>
of operators achieve the goal &quot;IPv6 Ready&quot;. This provide a strong=
 base for SRv6 deployments which can help operators<br>
provide new services based on IPv6 infrastructure. Moreover the easy increm=
ental deployment advantage of SRv6 (refer<br>
to <a href=3D"https://tools.ietf.org/html/draft-xie-spring-srv6-network-mig=
ration-00" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html=
/draft-xie-spring-srv6-network-migration-00</a> ) facilitates the SRv6 depl=
oyments in the existing<br>
network. Besides the SRv6 deployments proposed in the draft, there will be =
more SRv6 for different application scenariosin<br>
the near future. These SRv6 deployments=C2=A0 are also promoting the IPv6 d=
eployment and more IPv6 traffic will be beared by<br>
these networks.=C2=A0<br>
<br>
<br>
<br>
Best Regards,<br>
Robin<br>
<br>
<br>
<br>
________________________________________<br>
=E5=8F=91=E4=BB=B6=E4=BA=BA: <a href=3D"mailto:internet-drafts@ietf.org" ta=
rget=3D"_blank">internet-drafts@ietf.org</a> [<a href=3D"mailto:internet-dr=
afts@ietf.org" target=3D"_blank">internet-drafts@ietf.org</a>]<br>
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=A5 1=
1:15<br>
=E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence Filsfils; Lizhenbin; Sator=
u Matsushima<br>
=E4=B8=BB=E9=A2=98: New Version Notification for draft-matsushima-spring-sr=
v6-deployment-status-02.txt<br>
<br>
A new version of I-D, draft-matsushima-spring-srv6-deployment-status-02.txt=
<br>
has been successfully submitted by Zafar Ali and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-matsushima-spring-srv6-=
deployment-status<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A002<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 SRv6 Implementation and Deployment=
 Status<br>
Document date:=C2=A0 2019-10-14<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 19<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-matsushima-spring-srv6-deployment-status-02.txt" r=
el=3D"noreferrer" target=3D"_blank">https://www.ietf.org/internet-drafts/dr=
aft-matsushima-spring-srv6-deployment-status-02.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-matsushima-spring-srv6-deployment-status/" rel=3D"noreferre=
r" target=3D"_blank">https://datatracker.ietf.org/doc/draft-matsushima-spri=
ng-srv6-deployment-status/</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-matsushima-spring-srv6-deployment-status-02" rel=3D"noreferrer" targe=
t=3D"_blank">https://tools.ietf.org/html/draft-matsushima-spring-srv6-deplo=
yment-status-02</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org=
/doc/html/draft-matsushima-spring-srv6-deployment-status" rel=3D"noreferrer=
" target=3D"_blank">https://datatracker.ietf.org/doc/html/draft-matsushima-=
spring-srv6-deployment-status</a><br>
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.o=
rg/rfcdiff?url2=3Ddraft-matsushima-spring-srv6-deployment-status-02" rel=3D=
"noreferrer" target=3D"_blank">https://www.ietf.org/rfcdiff?url2=3Ddraft-ma=
tsushima-spring-srv6-deployment-status-02</a><br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This draft provides an overview of IPv6 Segment Routing (SRv6)=
<br>
=C2=A0 =C2=A0deployment status.=C2=A0 It lists various SRv6 features that h=
ave been<br>
=C2=A0 =C2=A0deployed in the production networks.=C2=A0 It also provides an=
 overview of<br>
=C2=A0 =C2=A0SRv6 implementation and interoperability testing status.<br>
<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
The IETF Secretariat<br>
--------------------------------------------------------------------<br>
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Administrative Requests: <a href=3D"https://www.ietf.org/mailman/listinfo/i=
pv6" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/mailman/list=
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</div>
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Administrative Requests: <a href=3D"https://www.ietf.org/mailman/listinfo/i=
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</div>
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Date: Fri, 18 Oct 2019 14:00:24 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Robert Raszuk <robert@raszuk.net>
Cc: Hirofumi Ichihara <ichihara.hirofumi@gmail.com>,  "=?utf-8?Q?spring=40ietf.org?=" <spring@ietf.org>
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Subject: Re: [spring] Fw: New Version Notification for draft-matsushima-spring-srv6-deployment-status-02.txt
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No, I don=E2=80=99t, waste of resources, in a leaf-spine network any ECMP=
 path is loop-free per definition.
My questions is really about use of SRv6 in the fabric (not on the hosts)=


Cheers,
Jeff
On Oct 18, 2019, 1:56 PM -0700, Robert Raszuk <robert=40raszuk.net>, wrot=
e:
> Hi Jeff,
>
> > In case of link/node failure it would use fast-rehash over ECMP rathe=
r that TI-L=46A=3F
>
> Do you think that this is a good=C2=A0idea to consider using TI-L=46A i=
n a Clos fabric =3F
>
> Thx,
> R.
>
> > On =46ri, Oct 18, 2019 at 10:53 PM Jeff Tantsura <jefftant.ietf=40gma=
il.com> wrote:
> > > Hello Hirofumi,
> > >
> > > Many thanks for sharing the use case.
> > > Reading your slides, it looks like completely host based overlay de=
sign, e.g. no fabric switch is SRv6 aware, not using any of SRv6 function=
ality (TE, IP=46RR, etc) and their solely function is to forward traffic =
towards destinations of remote hosts over L3 IP fabric=3F In case of link=
/node failure it would use fast-rehash over ECMP rather that TI-L=46A=3F
> > >
> > > Thanks in advance=21
> > >
> > > Cheers,
> > > Jeff
> > > On Oct 17, 2019, 6:30 PM -0700, Hirofumi Ichihara <ichihara.hirofum=
i=40gmail.com>, wrote:
> > > > Hi,
> > > >
> > > > Let me introduce LINE's SRv6 DC use case as well. We have already=
 deployed SRv6 network with our private cloud on production environment. =
Please have a look at this slide( https://speakerdeck.com/line=5Fdevelope=
rs/line-data-center-networking-with-srv6=C2=A0) if you're interested in o=
ur use case. And also we're interested in other DC use cases and implemen=
tations.. Please let me know if you have such information.
> > > >
> > > > Thanks,
> > > > Hirofumi
> > > >
> > > >
> > > > > 2019=E5=B9=B410=E6=9C=8817=E6=97=A5(=E6=9C=A8) 21:31 Lizhenbin =
<lizhenbin=40huawei.com>:
> > > > > > Hi =46olks,
> > > > > > We updated the SRv6 deployment draft as follows. There are tw=
o new deployments of SRv6 from China for reference:
> > > > > > China Unicom and CERNET2. In the past two years, China pushed=
 the IPv6 deployment and almost all the IP networks
> > > > > > of operators achieve the goal =22IPv6 Ready=22. This provide =
a strong base for SRv6 deployments which can help operators
> > > > > > provide new services based on IPv6 infrastructure. Moreover t=
he easy incremental deployment advantage of SRv6 (refer
> > > > > > to https://tools.ietf.org/html/draft-xie-spring-srv6-network-=
migration-00 ) facilitates the SRv6 deployments in the existing
> > > > > > network. Besides the SRv6 deployments proposed in the draft, =
there will be more SRv6 for different application scenariosin
> > > > > > the near future. These SRv6 deployments=C2=A0 are also promot=
ing the IPv6 deployment and more IPv6 traffic will be beared by
> > > > > > these networks.
> > > > > >
> > > > > >
> > > > > >
> > > > > > Best Regards,
> > > > > > Robin
> > > > > >
> > > > > >
> > > > > >
> > > > > > =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
> > > > > > =E5=8F=91=E4=BB=B6=E4=BA=BA: internet-drafts=40ietf.org =5Bin=
ternet-drafts=40ietf.org=5D
> > > > > > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=88=
15=E6=97=A5 11:15
> > > > > > =E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence =46ilsfils; =
Lizhenbin; Satoru Matsushima
> > > > > > =E4=B8=BB=E9=A2=98: New Version Notification for draft-matsus=
hima-spring-srv6-deployment-status-02.txt
> > > > > >
> > > > > > A new version of I-D, draft-matsushima-spring-srv6-deployment=
-status-02.txt
> > > > > > has been successfully submitted by Zafar Ali and posted to th=
e
> > > > > > IET=46 repository.
> > > > > >
> > > > > > Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-matsushim=
a-spring-srv6-deployment-status
> > > > > > Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A002
> > > > > > Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 SRv6 Implementation =
and Deployment Status
> > > > > > Document date:=C2=A0 2019-10-14
> > > > > > Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submissio=
n
> > > > > > Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 19
> > > > > > URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.iet=
f.org/internet-drafts/draft-matsushima-spring-srv6-deployment-status-02.t=
xt
> > > > > > Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://datatracker.=
ietf.org/doc/draft-matsushima-spring-srv6-deployment-status/
> > > > > > Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://tools.ietf.org/ht=
ml/draft-matsushima-spring-srv6-deployment-status-02
> > > > > > Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://datatracker.ietf.=
org/doc/html/draft-matsushima-spring-srv6-deployment-status
> > > > > > Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://www.iet=
f.org/rfcdiff=3Furl2=3Ddraft-matsushima-spring-srv6-deployment-status-02
> > > > > >
> > > > > > Abstract:
> > > > > > =C2=A0 =C2=A0This draft provides an overview of IPv6 Segment =
Routing (SRv6)
> > > > > > =C2=A0 =C2=A0deployment status.=C2=A0 It lists various SRv6 f=
eatures that have been
> > > > > > =C2=A0 =C2=A0deployed in the production networks.=C2=A0 It al=
so provides an overview of
> > > > > > =C2=A0 =C2=A0SRv6 implementation and interoperability testing=
 status.
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > Please note that it may take a couple of minutes from the tim=
e of submission
> > > > > > until the htmlized version and diff are available at tools.ie=
tf.org.
> > > > > >
> > > > > > The IET=46 Secretariat
> > > > > > -------------------------------------------------------------=
-------
> > > > > > IET=46 IPv6 working group mailing list
> > > > > > ipv6=40ietf.org
> > > > > > Administrative Requests: https://www.ietf.org/mailman/listinf=
o/ipv6
> > > > > > -------------------------------------------------------------=
-------
> > > > -----------------------------------------------------------------=
---
> > > > IET=46 IPv6 working group mailing list
> > > > ipv6=40ietf.org
> > > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ip=
v6
> > > > -----------------------------------------------------------------=
---
> > > =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
> > > spring mailing list
> > > spring=40ietf.org
> > > https://www.ietf.org/mailman/listinfo/spring

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<html xmlns=3D=22http://www.w3.org/1999/xhtml=22>
<head>
<title></title>
</head>
<body>
<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>No, I don=E2=80=99t, waste of resources, in a leaf-=
spine network any ECMP path is loop-free per definition. &=23160;
<div dir=3D=22auto=22>My questions is really about use of SRv6 in the fab=
ric (not on the hosts)</div>
</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Oct 18, 2019, 1:56 PM -0700, Rob=
ert Raszuk &lt;robert=40raszuk.net&gt;, wrote:<br />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =231abc9c;=22>
<div dir=3D=22ltr=22>Hi Jeff,
<div><br /></div>
<div>&gt; In case of link/node failure it would use fast-rehash over ECMP=
 rather that TI-L=46A=3F&=23160;&=23160;<br /></div>
<div><br /></div>
<div>Do you think that this is a good&=23160;idea to consider using TI-L=46=
A in a Clos fabric =3F&=23160;</div>
<div><br /></div>
<div>Thx,</div>
<div>R.</div>
</div>
<br />
<div class=3D=22gmail=5Fquote=22>
<div dir=3D=22ltr=22 class=3D=22gmail=5Fattr=22>On =46ri, Oct 18, 2019 at=
 10:53 PM Jeff Tantsura &lt;<a href=3D=22mailto:jefftant.ietf=40gmail.com=
=22>jefftant.ietf=40gmail.com</a>&gt; wrote:<br /></div>
<blockquote class=3D=22gmail=5Fquote spark=5Fquote=22 style=3D=22margin: =
5px 5px; padding-left: 10px; border-left: thin solid =23e67e22;=22>
<div>
<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>Hello Hirofumi,
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>Many thanks for sharing the use case.</div>
<div dir=3D=22auto=22>Reading your slides, it looks like completely host =
based overlay design, e.g. no fabric switch is SRv6 aware, not using any =
of SRv6 functionality (TE, IP=46RR, etc) and their solely function is to =
forward traffic towards destinations of remote hosts over L3 IP fabric=3F=
 In case of link/node failure it would use fast-rehash over ECMP rather t=
hat TI-L=46A=3F</div>
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>Thanks in advance=21<br /></div>
</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Oct 17, 2019, 6:30 PM -0700, Hir=
ofumi Ichihara &lt;<a href=3D=22mailto:ichihara.hirofumi=40gmail.com=22 t=
arget=3D=22=5Fblank=22>ichihara.hirofumi=40gmail.com</a>&gt;, wrote:<br /=
>
<blockquote type=3D=22cite=22 style=3D=22margin: 5px 5px; padding-left: 1=
0px; border-left: thin solid =233498db;=22 class=3D=22spark=5Fquote=22>
<div dir=3D=22ltr=22>
<div dir=3D=22ltr=22>Hi,
<div><br /></div>
<div>Let me introduce LINE's SRv6 DC use case as well. We have already de=
ployed SRv6 network with our private cloud on production environment. Ple=
ase have a look at this slide( <a href=3D=22https://speakerdeck.com/line=5F=
developers/line-data-center-networking-with-srv6=22 target=3D=22=5Fblank=22=
>https://speakerdeck.com/line=5Fdevelopers/line-data-center-networking-wi=
th-srv6</a>&=23160;) if you're interested in our use case. And also we're=
 interested in other DC use cases and implementations.. Please let me kno=
w if you have such information.</div>
<div><br /></div>
<div>Thanks,</div>
<div>Hirofumi</div>
<div><br /></div>
</div>
</div>
<br />
<div class=3D=22gmail=5Fquote=22>
<div dir=3D=22ltr=22 class=3D=22gmail=5Fattr=22>2019=E5=B9=B410=E6=9C=881=
7=E6=97=A5(=E6=9C=A8) 21:31 Lizhenbin &lt;<a href=3D=22mailto:lizhenbin=40=
huawei.com=22 target=3D=22=5Fblank=22>lizhenbin=40huawei.com</a>&gt;:<br =
/></div>
<blockquote class=3D=22gmail=5Fquote spark=5Fquote=22 style=3D=22margin: =
5px 5px; padding-left: 10px; border-left: thin solid =23d35400;=22>Hi =46=
olks,<br />
We updated the SRv6 deployment draft as follows. There are two new deploy=
ments of SRv6 from China for reference:<br />
China Unicom and CERNET2. In the past two years, China pushed the IPv6 de=
ployment and almost all the IP networks<br />
of operators achieve the goal =22IPv6 Ready=22. This provide a strong bas=
e for SRv6 deployments which can help operators<br />
provide new services based on IPv6 infrastructure. Moreover the easy incr=
emental deployment advantage of SRv6 (refer<br />
to <a href=3D=22https://tools.ietf.org/html/draft-xie-spring-srv6-network=
-migration-00=22 rel=3D=22noreferrer=22 target=3D=22=5Fblank=22>https://t=
ools.ietf.org/html/draft-xie-spring-srv6-network-migration-00</a> ) facil=
itates the SRv6 deployments in the existing<br />
network. Besides the SRv6 deployments proposed in the draft, there will b=
e more SRv6 for different application scenariosin<br />
the near future. These SRv6 deployments&=23160; are also promoting the IP=
v6 deployment and more IPv6 traffic will be beared by<br />
these networks.&=23160;<br />
<br />
<br />
<br />
Best Regards,<br />
Robin<br />
<br />
<br />
<br />
=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<br />
=E5=8F=91=E4=BB=B6=E4=BA=BA: <a href=3D=22mailto:internet-drafts=40ietf.o=
rg=22 target=3D=22=5Fblank=22>internet-drafts=40ietf.org</a> =5B<a href=3D=
=22mailto:internet-drafts=40ietf.org=22 target=3D=22=5Fblank=22>internet-=
drafts=40ietf.org</a>=5D<br />
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=A5=
 11:15<br />
=E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence =46ilsfils; Lizhenbin; S=
atoru Matsushima<br />
=E4=B8=BB=E9=A2=98: New Version Notification for draft-matsushima-spring-=
srv6-deployment-status-02.txt<br />
<br />
A new version of I-D, draft-matsushima-spring-srv6-deployment-status-02.t=
xt<br />
has been successfully submitted by Zafar Ali and posted to the<br />
IET=46 repository.<br />
<br />
Name:&=23160; &=23160; &=23160; &=23160; &=23160; &=23160;draft-matsushim=
a-spring-srv6-deployment-status<br />
Revision:&=23160; &=23160; &=23160; &=23160;02<br />
Title:&=23160; &=23160; &=23160; &=23160; &=23160; SRv6 Implementation an=
d Deployment Status<br />
Document date:&=23160; 2019-10-14<br />
Group:&=23160; &=23160; &=23160; &=23160; &=23160; Individual Submission<=
br />
Pages:&=23160; &=23160; &=23160; &=23160; &=23160; 19<br />
URL:&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; <a href=3D=22ht=
tps://www.ietf.org/internet-drafts/draft-matsushima-spring-srv6-deploymen=
t-status-02.txt=22 rel=3D=22noreferrer=22 target=3D=22=5Fblank=22>https:/=
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tus-02.txt</a><br />
Status:&=23160; &=23160; &=23160; &=23160; &=23160;<a href=3D=22https://d=
atatracker.ietf.org/doc/draft-matsushima-spring-srv6-deployment-status/=22=
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Htmlized:&=23160; &=23160; &=23160; &=23160;<a href=3D=22https://tools.ie=
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Htmlized:&=23160; &=23160; &=23160; &=23160;<a href=3D=22https://datatrac=
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s-02</a><br />
<br />
Abstract:<br />
&=23160; &=23160;This draft provides an overview of IPv6 Segment Routing =
(SRv6)<br />
&=23160; &=23160;deployment status.&=23160; It lists various SRv6 feature=
s that have been<br />
&=23160; &=23160;deployed in the production networks.&=23160; It also pro=
vides an overview of<br />
&=23160; &=23160;SRv6 implementation and interoperability testing status.=
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Hi R=
ajesh:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">The =
answer to your question, I think, had better be provided by Authors of NET-=
PGM, You can also refer to Ron=A1=AFs email previously one or two days befo=
re who give some guess, I think it make sense,
 in addition , also including processing-load mitigation in Last hop (egres=
s PE);
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Coul=
d you Pls explain the benefit of similar behavior in PHP of MPLS world. &nb=
sp;I think it may be same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:JA">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language:JA=
"> Rajesh M &lt;mrajesh@juniper.net&gt;
<br>
<b>Sent:</b> 2019</span><span lang=3D"JA" style=3D"font-family:&quot;MS PGo=
thic&quot;,sans-serif;mso-fareast-language:JA">=C4=EA</span><span lang=3D"E=
N-US" style=3D"mso-fareast-language:JA">10</span><span lang=3D"JA" style=3D=
"font-family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA">=D4=
=C2</span><span lang=3D"EN-US" style=3D"mso-fareast-language:JA">18</span><=
span lang=3D"JA" style=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso=
-fareast-language:JA">=C8=D5</span><span lang=3D"EN-US" style=3D"mso-fareas=
t-language:JA">
 20:18<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;weibin.wang@nokia-sbell.com=
&gt;; Rajesh M &lt;mrajesh=3D40juniper.net@dmarc.ietf.org&gt;; Pablo Camari=
llo (pcamaril) &lt;pcamaril@cisco.com&gt;; SPRING WG List &lt;spring@ietf.o=
rg&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;<br>
<b>Subject:</b> RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-=
srv6-network-programming-04#page-24<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US">I was more focused towards END.DT4 SID where behavior you mentioned i=
s possible only if we do below optimization in
</span><span lang=3D"EN-US"><a href=3D"https://urldefense.com/v3/__https:/t=
ools.ietf.org/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQ=
hv3Ai4Cky1wjCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$">https://tools.i=
etf.org/html/draft-dawra-bess-srv6-services-02</a>&nbsp;
 section 3.</span><span lang=3D"EN-US" style=3D"mso-fareast-language:EN-US"=
><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">when the received route is colored with an =
extended color community 'C' and Next-Hop 'N', and the ingress PE has a val=
id SRv6 Policy (C, N) associated with SID list &lt;S1,S2,
 S3&gt;, then the effective SR Policy is &lt;S1, S2, SRv6-Service-SID&gt;.H=
ere if you see <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red">S3 and SRv6-Service-SID both b=
elong to Egress so s3 has been removed.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red">For you my query is removing o=
nly SRH header on PHP router will give what kind of advantage ?<o:p></o:p><=
/span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">Thanks<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">Rajesh<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Wang, Weibin (NSB - CN/Shanghai)<br>
<b>Sent:</b> Friday, October 18, 2019 9:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.iet=
f.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pca=
maril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;=
; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>=
&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">The =
value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent the =
last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 node=
 copy IPv6 SID corresponding to [SL]=3D0 to
 DA field of IP packet, when enable PSP flavor at same time, the penultimat=
e SRv6 node will check the [SL] value, if it is 0, then pop SRH, these extr=
a action is pseudocode of PSP. This logic has no problem.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=
=BA=DA&quot;,sans-serif">=C4=EA</span><span lang=3D"EN-US">10</span><span s=
tyle=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=D4=C2=
</span><span lang=3D"EN-US">18</span><span style=3D"font-family:&quot;=CE=
=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C8=D5</span><span lang=3D"EN-US"> =
6:38<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.=
com">pcamaril@cisco.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:sprin=
g@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">WANG had given below use case :=
 But using existing PSP logic this will not work.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In below at PSP router updated =
SL will be 1 (since END.DT4 is still there) ,so SRH pop won=A1=AFt happen.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbs=
p;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbs=
p;&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">WANG use case:<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white">=A1=B0For example in SRv6-based=
 L3VPN service scenario, The ingress PE within SRv6-enabled domain can util=
ize SR-TE policy to enable TE-path function
 when encapsulating and transiting L3VPN traffic, The Ingress PE push on cu=
stomer packets with SID list representing SR-TE policy plus END.DT4 as last=
 SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be designed to=
 perform in related SRv6 endpoint.
 Imaging the PSP, the penultimate Endpoint can perform PSP, e.g. copy the l=
ast SID (END.DT4) of SRH to destination field of IPv6 header and POP the SR=
H, then forwarding it toward egress PE identified by DA=A1=B1<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco=
..com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 10:13 PM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spri=
ng@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3k=
DJQnV$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rajesh,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This has already been replied l=
ess than one week ago.. Please see:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://urldefense.c=
om/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJj=
lg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9J=
w7HGIr9o9$">https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecX=
FxqJjlg_c</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES"><a href=3D"https://urldefense.com/=
v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfa=
k__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P=
8QaU_7$"><span lang=3D"EN-US">https://mailarchive.ietf.org/arch/msg/spring/=
WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><span lang=3D"EN-US"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span lang=3D"ES" st=
yle=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Friday, 11 October 2019 at 03:47<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc: </b>Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;, Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject: </b>[spring] <a href=3D"https://urldefense.com/v3/__https:/tool=
s.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!=
8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQn=
V$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES"><o:p>=
&nbsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">Wanted to know the use =
case where we only POP the SRH ?<o:p></o:p></span></pre>
<h4 style=3D"margin-left:36.0pt"><span lang=3D"ES"><a href=3D"https://urlde=
fense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-pr=
ogramming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7J=
IhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$">4.16.1</a></span><a name=3D"section-4.=
16..1"></a><span lang=3D"ES" style=3D"font-family:&quot;Courier New&quot;">=
..&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><span lang=3D"ES"><o:p></o:p=
></span></h4>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; The SRH pr=
ocessing of the End, End.X and End.T behaviors are<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; modified: =
after the instruction &quot;S14.&nbsp; Update IPv6 DA with Segment<o:p></o:=
p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; List[Segme=
nts Left]&quot; is executed, the following instructions must be<o:p></o:p><=
/span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; executed a=
s well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbs=
p;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbs=
p;&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp=
;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:36.0pt;margin-bottom:.=
0001pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
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From: Rajesh M <mrajesh@juniper.net>
To: "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>, Ron Bonica <rbonica@juniper.net>
Thread-Topic: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/jL8WcB6XaJUEetJXDfGqyFLg19Q>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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--_000_MN2PR05MB6080204CE8F16BE1FC68E713BE6F0MN2PR05MB6080namp_
Content-Type: text/plain; charset="iso-2022-jp"
Content-Transfer-Encoding: quoted-printable

MPLS world PSP will help in avoiding one more lookup at egress for VPN case=
s.

I feel both PSP and USP are not useful in case of SRV6.



Juniper Business Use Only
From: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>
Sent: Saturday, October 19, 2019 6:26 AM
To: Rajesh M <mrajesh@juniper.net>; Rajesh M <mrajesh=3D40juniper.net@dmarc=
.ietf.org>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com>; SPRING WG List=
 <spring@ietf.org>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

Hi Rajesh:
The answer to your question, I think, had better be provided by Authors of =
NET-PGM, You can also refer to Ron=1B$B!G=1B(Bs email previously one or two=
 days before who give some guess, I think it make sense, in addition , also=
 including processing-load mitigation in Last hop (egress PE);
Could you Pls explain the benefit of similar behavior in PHP of MPLS world.=
  I think it may be same.

--------------------------------------
Cheers !


WANG Weibin

From: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 20:18
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:we=
ibin.wang@nokia-sbell.com>>; Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.o=
rg<mailto:mrajesh=3D40juniper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamar=
il) <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>; SPRING WG List <spring=
@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

I was more focused towards END.DT4 SID where behavior you mentioned is poss=
ible only if we do below optimization in https://tools.ietf.org/html/draft-=
dawra-bess-srv6-services-02<https://urldefense.com/v3/__https:/tools.ietf.o=
rg/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1w=
jCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$>  section 3.

when the received route is colored with an extended color community 'C' and=
 Next-Hop 'N', and the ingress PE has a valid SRv6 Policy (C, N) associated=
 with SID list <S1,S2, S3>, then the effective SR Policy is <S1, S2, SRv6-S=
ervice-SID>.Here if you see
S3 and SRv6-Service-SID both belong to Egress so s3 has been removed.


For you my query is removing only SRH header on PHP router will give what k=
ind of advantage ?

Thanks
Rajesh





Juniper Business Use Only
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Wang, Weibin (NSB - CN/Shanghai)
Sent: Friday, October 18, 2019 9:26 AM
To: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40jun=
iper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<m=
ailto:pcamaril@cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@i=
etf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

The value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent =
the last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 =
node copy IPv6 SID corresponding to [SL]=3D0 to DA field of IP packet, when=
 enable PSP flavor at same time, the penultimate SRv6 node will check the [=
SL] value, if it is 0, then pop SRH, these extra action is pseudocode of PS=
P. This logic has no problem.


--------------------------------------
Cheers !


WANG Weibin

From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Rajesh M
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 6:38
To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.co=
m>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

WANG had given below use case : But using existing PSP logic this will not =
work.
In below at PSP router updated SL will be 1 (since END.DT4 is still there) =
,so SRH pop won=1B$B!G=1B(Bt happen.



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }

WANG use case:
=1B$B!H=1B(BFor example in SRv6-based L3VPN service scenario, The ingress P=
E within SRv6-enabled domain can utilize SR-TE policy to enable TE-path fun=
ction when encapsulating and transiting L3VPN traffic, The Ingress PE push =
on customer packets with SID list representing SR-TE policy plus END.DT4 as=
 last SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be design=
ed to perform in related SRv6 endpoint. Imaging the PSP, the penultimate En=
dpoint can perform PSP, e.g. copy the last SID (END.DT4) of SRH to destinat=
ion field of IPv6 header and POP the SRH, then forwarding it toward egress =
PE identified by DA=1B$B!I=1B(B







Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.=
.com>>
Sent: Tuesday, October 15, 2019 10:13 PM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; SPRING WG L=
ist <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>

Rajesh,

This has already been replied less than one week ago.. Please see:
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0Zpj=
VLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7HGIr9o9$>
https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzR=
ZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7P8QaU_7$>

Thanks,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D=
40juniper.net@dmarc.ietf.org>>
Date: Friday, 11 October 2019 at 03:47
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>, Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-networ=
k-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.org/=
html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c=
!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>


Wanted to know the use case where we only POP the SRH ?

4.16.1<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-sp=
ring-srv6-network-programming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31=
cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$>..  PSP: Penultimat=
e Segment Pop of the SRH

   The SRH processing of the End, End.X and End.T behaviors are

   modified: after the instruction "S14.  Update IPv6 DA with Segment

   List[Segments Left]" is executed, the following instructions must be

   executed as well:



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }



Juniper Business Use Only

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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">MPLS worl=
d PSP will help in avoiding one more lookup at egress for VPN cases.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">I feel </=
span>both PSP and USP are not useful in case of SRV6.<span style=3D"mso-far=
east-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;we=
ibin.wang@nokia-sbell.com&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 6:26 AM<br>
<b>To:</b> Rajesh M &lt;mrajesh@juniper.net&gt;; Rajesh M &lt;mrajesh=3D40j=
uniper.net@dmarc.ietf.org&gt;; Pablo Camarillo (pcamaril) &lt;pcamaril@cisc=
o.com&gt;; SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;<br>
<b>Subject:</b> RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-=
srv6-network-programming-04#page-24<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Hi Rajesh:<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">The answer to your =
question, I think, had better be provided by Authors of NET-PGM, You can al=
so refer to Ron=1B$B!G=1B(Bs email previously one or two days before who gi=
ve some guess, I think it make sense, in addition
 , also including processing-load mitigation in Last hop (egress PE); <o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Could you Pls expla=
in the benefit of similar behavior in PHP of MPLS world. &nbsp;I think it m=
ay be same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt">------------------------------------=
--<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans=
-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">WANG Weibin&nbsp;
</span></b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roma=
n&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:JA">From:</sp=
an></b><span style=3D"mso-fareast-language:JA"> Rajesh M &lt;<a href=3D"mai=
lto:mrajesh@juniper.net">mrajesh@juniper.net</a>&gt;
<br>
<b>Sent:</b> 2019</span><span lang=3D"JA" style=3D"font-family:&quot;MS PGo=
thic&quot;,sans-serif;mso-fareast-language:JA">=1B$BG/=1B(B</span><span sty=
le=3D"mso-fareast-language:JA">10</span><span lang=3D"JA" style=3D"font-fam=
ily:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA">=1B$B7n=1B(B=
</span><span style=3D"mso-fareast-language:JA">18</span><span lang=3D"JA" s=
tyle=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:=
JA">=1B$BF|=1B(B</span><span style=3D"mso-fareast-language:JA">
 20:18<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;; Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh=3D40juniper.net@dmarc.ietf.org">mrajesh=3D40juniper.ne=
t@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pcamaril)
 &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;; SPRI=
NG WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;<b=
r>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">I was mor=
e focused towards END.DT4 SID where behavior you mentioned is possible only=
 if we do below optimization in
</span><a href=3D"https://urldefense.com/v3/__https:/tools.ietf.org/html/dr=
aft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1wjCRKLg4MMb=
WlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$">https://tools.ietf.org/html/draft-da=
wra-bess-srv6-services-02</a>&nbsp; section
 3.<span style=3D"mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">when the received route is colored with an extended color =
community 'C' and Next-Hop 'N', and the ingress PE has a valid SRv6 Policy =
(C, N) associated with SID list &lt;S1,S2, S3&gt;, then
 the effective SR Policy is &lt;S1, S2, SRv6-Service-SID&gt;.Here if you se=
e <o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red">S3 and SRv6-Service-SID both belong to Egress=
 so s3 has been removed.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red">For you my query is removing only SRH header =
on PHP router will give what kind of advantage ?<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">Thanks<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">Rajesh<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Wang, Weibin (NSB - CN/Shanghai)<br>
<b>Sent:</b> Friday, October 18, 2019 9:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.iet=
f.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pca=
maril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;=
; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>=
&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">The value of Segmen=
t Left field in SRH begin with 0, so [SL]=3D0 represent the last SID. in th=
is case, when [SL] decrease 1, and the penultimate SRv6 node copy IPv6 SID =
corresponding to [SL]=3D0 to DA field of
 IP packet, when enable PSP flavor at same time, the penultimate SRv6 node =
will check the [SL] value, if it is 0, then pop SRH, these extra action is =
pseudocode of PSP. This logic has no problem.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt">------------------------------------=
--<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans=
-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">WANG Weibin&nbsp;
</span></b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roma=
n&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 2019<span lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft =
YaHei&quot;,sans-serif">=1B$BG/=1B(B</span>10<span lang=3D"ZH-CN" style=3D"=
font-family:&quot;Microsoft YaHei&quot;,sans-serif">=1B$B7n=1B(B</span>18<s=
pan lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-se=
rif">=1B$BF|=1B(B</span> 6:38<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.=
com">pcamaril@cisco.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:sprin=
g@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">WANG had given below use case : But using existing P=
SP logic this will not work.<o:p></o:p></p>
<p class=3D"MsoNormal">In below at PSP router updated SL will be 1 (since E=
ND.DT4 is still there) ,so SRH pop won=1B$B!G=1B(Bt happen.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">WANG use case:<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white">=1B$B!H=1B(BFor example in SRv6-based L3VPN se=
rvice scenario, The ingress PE within SRv6-enabled domain can utilize SR-TE=
 policy to enable TE-path function when encapsulating
 and transiting L3VPN traffic, The Ingress PE push on customer packets with=
 SID list representing SR-TE policy plus END.DT4 as last SRv6 SID in SRH; S=
o I think, each flavor of PSP/USP/USD can be designed to perform in related=
 SRv6 endpoint. Imaging the PSP,
 the penultimate Endpoint can perform PSP, e.g. copy the last SID (END.DT4)=
 of SRH to destination field of IPv6 header and POP the SRH, then forwardin=
g it toward egress PE identified by DA=1B$B!I=1B(B<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;<a href=
=3D"mailto:pcamaril@cisco..com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 10:13 PM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spri=
ng@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3k=
DJQnV$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Rajesh,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This has already been replied less than one week ago=
.. Please see:
<o:p></o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://urldefense.com/v3/__https:/mailar=
chive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W=
8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7HGIr9o9$">https://m=
ailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c</a><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES"><a href=3D"https://urldefense.com/=
v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfa=
k__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P=
8QaU_7$"><span lang=3D"EN-US">https://mailarchive.ietf.org/arch/msg/spring/=
WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span lang=3D"ES" styl=
e=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Friday, 11 October 2019 at 03:47<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc: </b>Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;, Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject: </b>[spring] <a href=3D"https://urldefense.com/v3/__https:/tool=
s.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!=
8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQn=
V$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">Wanted to know the use ca=
se where we only POP the SRH ?<o:p></o:p></span></pre>
<h4 style=3D"margin-left:.5in"><span lang=3D"ES"><a href=3D"https://urldefe=
nse.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-prog=
ramming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIh=
uJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$">4.16.1</a></span><a name=3D"section-4.16=
..1"></a><span lang=3D"ES" style=3D"font-family:&quot;Courier New&quot;">..=
&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><span lang=3D"ES"><o:p></o:p=
></span></h4>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; The SRH proc=
essing of the End, End.X and End.T behaviors are<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; modified: af=
ter the instruction &quot;S14.&nbsp; Update IPv6 DA with Segment<o:p></o:p>=
</span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; List[Segment=
s Left]&quot; is executed, the following instructions must be<o:p></o:p></s=
pan></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; executed as =
well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<o:p></o:p></span><=
/pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
</div>
</body>
</html>

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From: Hirofumi Ichihara <ichihara.hirofumi@gmail.com>
Date: Sat, 19 Oct 2019 11:35:44 +0900
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Hi,

> Reading your slides, it looks like completely host based overlay design
Right. We use SRv6 for overlay only now and there are just two kind of SR
aware nodes, that is Hypervisor and NetworkNode. We'd like to extend SR to
fabric switch and NFV device in future so that we use other SR
features(e.g. SFC, TI-LFA)

Thanks,
Hirofumi

2019=E5=B9=B410=E6=9C=8819=E6=97=A5(=E5=9C=9F) 6:00 Jeff Tantsura <jefftant=
.ietf@gmail.com>:

> No, I don=E2=80=99t, waste of resources, in a leaf-spine network any ECMP=
 path is
> loop-free per definition.
> My questions is really about use of SRv6 in the fabric (not on the hosts)
>
> Cheers,
> Jeff
> On Oct 18, 2019, 1:56 PM -0700, Robert Raszuk <robert@raszuk.net>, wrote:
>
> Hi Jeff,
>
> > In case of link/node failure it would use fast-rehash over ECMP rather
> that TI-LFA?
>
> Do you think that this is a good idea to consider using TI-LFA in a Clos
> fabric ?
>
> Thx,
> R.
>
> On Fri, Oct 18, 2019 at 10:53 PM Jeff Tantsura <jefftant.ietf@gmail.com>
> wrote:
>
>> Hello Hirofumi,
>>
>> Many thanks for sharing the use case.
>> Reading your slides, it looks like completely host based overlay design,
>> e.g. no fabric switch is SRv6 aware, not using any of SRv6 functionality
>> (TE, IPFRR, etc) and their solely function is to forward traffic towards
>> destinations of remote hosts over L3 IP fabric? In case of link/node
>> failure it would use fast-rehash over ECMP rather that TI-LFA?
>>
>> Thanks in advance!
>>
>> Cheers,
>> Jeff
>> On Oct 17, 2019, 6:30 PM -0700, Hirofumi Ichihara <
>> ichihara.hirofumi@gmail.com>, wrote:
>>
>> Hi,
>>
>> Let me introduce LINE's SRv6 DC use case as well. We have already
>> deployed SRv6 network with our private cloud on production environment.
>> Please have a look at this slide(
>> https://speakerdeck.com/line_developers/line-data-center-networking-with=
-srv6 )
>> if you're interested in our use case. And also we're interested in other=
 DC
>> use cases and implementations.. Please let me know if you have such
>> information.
>>
>> Thanks,
>> Hirofumi
>>
>>
>> 2019=E5=B9=B410=E6=9C=8817=E6=97=A5(=E6=9C=A8) 21:31 Lizhenbin <lizhenbi=
n@huawei.com>:
>>
>>> Hi Folks,
>>> We updated the SRv6 deployment draft as follows. There are two new
>>> deployments of SRv6 from China for reference:
>>> China Unicom and CERNET2. In the past two years, China pushed the IPv6
>>> deployment and almost all the IP networks
>>> of operators achieve the goal "IPv6 Ready". This provide a strong base
>>> for SRv6 deployments which can help operators
>>> provide new services based on IPv6 infrastructure. Moreover the easy
>>> incremental deployment advantage of SRv6 (refer
>>> to
>>> https://tools.ietf.org/html/draft-xie-spring-srv6-network-migration-00
>>> ) facilitates the SRv6 deployments in the existing
>>> network. Besides the SRv6 deployments proposed in the draft, there will
>>> be more SRv6 for different application scenariosin
>>> the near future. These SRv6 deployments  are also promoting the IPv6
>>> deployment and more IPv6 traffic will be beared by
>>> these networks.
>>>
>>>
>>>
>>> Best Regards,
>>> Robin
>>>
>>>
>>>
>>> ________________________________________
>>> =E5=8F=91=E4=BB=B6=E4=BA=BA: internet-drafts@ietf.org [internet-drafts@=
ietf.org]
>>> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=
=A5 11:15
>>> =E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence Filsfils; Lizhenbin; S=
atoru Matsushima
>>> =E4=B8=BB=E9=A2=98: New Version Notification for
>>> draft-matsushima-spring-srv6-deployment-status-02.txt
>>>
>>> A new version of I-D,
>>> draft-matsushima-spring-srv6-deployment-status-02.txt
>>> has been successfully submitted by Zafar Ali and posted to the
>>> IETF repository.
>>>
>>> Name:           draft-matsushima-spring-srv6-deployment-status
>>> Revision:       02
>>> Title:          SRv6 Implementation and Deployment Status
>>> Document date:  2019-10-14
>>> Group:          Individual Submission
>>> Pages:          19
>>> URL:
>>> https://www.ietf.org/internet-drafts/draft-matsushima-spring-srv6-deplo=
yment-status-02.txt
>>> Status:
>>> https://datatracker.ietf.org/doc/draft-matsushima-spring-srv6-deploymen=
t-status/
>>> Htmlized:
>>> https://tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-sta=
tus-02
>>> Htmlized:
>>> https://datatracker.ietf.org/doc/html/draft-matsushima-spring-srv6-depl=
oyment-status
>>> Diff:
>>> https://www.ietf.org/rfcdiff?url2=3Ddraft-matsushima-spring-srv6-deploy=
ment-status-02
>>>
>>> Abstract:
>>>    This draft provides an overview of IPv6 Segment Routing (SRv6)
>>>    deployment status.  It lists various SRv6 features that have been
>>>    deployed in the production networks.  It also provides an overview o=
f
>>>    SRv6 implementation and interoperability testing status.
>>>
>>>
>>>
>>>
>>>
>>> Please note that it may take a couple of minutes from the time of
>>> submission
>>> until the htmlized version and diff are available at tools.ietf.org.
>>>
>>> The IETF Secretariat
>>> --------------------------------------------------------------------
>>> IETF IPv6 working group mailing list
>>> ipv6@ietf.org
>>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
>>> --------------------------------------------------------------------
>>>
>> --------------------------------------------------------------------
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<div dir=3D"ltr"><div dir=3D"ltr">Hi,<div><br></div><div>&gt; Reading your =
slides, it looks like completely host based overlay design</div><div>Right.=
 We use SRv6 for overlay only now and there are just two kind of SR aware n=
odes, that is Hypervisor and NetworkNode. We&#39;d like to extend SR to fab=
ric switch and NFV device in future so that we use other SR features(e.g. S=
FC, TI-LFA)</div><div><br></div><div>Thanks,</div><div>Hirofumi</div></div>=
</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
2019=E5=B9=B410=E6=9C=8819=E6=97=A5(=E5=9C=9F) 6:00 Jeff Tantsura &lt;<a hr=
ef=3D"mailto:jefftant.ietf@gmail.com">jefftant.ietf@gmail.com</a>&gt;:<br><=
/div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bo=
rder-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,2=
04);padding-left:1ex">



<div>
<div name=3D"messageBodySection">
<div dir=3D"auto">No, I don=E2=80=99t, waste of resources, in a leaf-spine =
network any ECMP path is loop-free per definition. =C2=A0
<div dir=3D"auto">My questions is really about use of SRv6 in the fabric (n=
ot on the hosts)</div>
</div>
</div>
<div name=3D"messageSignatureSection"><br>
<div>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D"messageReplySection">On Oct 18, 2019, 1:56 PM -0700, Robert Ra=
szuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_blank">robert@rasz=
uk.net</a>&gt;, wrote:<br>
<blockquote type=3D"cite" style=3D"margin:5px;padding-left:10px;border-left=
-width:thin;border-left-style:solid;border-left-color:rgb(26,188,156)">
<div dir=3D"ltr">Hi Jeff,
<div><br></div>
<div>&gt; In case of link/node failure it would use fast-rehash over ECMP r=
ather that TI-LFA?=C2=A0=C2=A0<br></div>
<div><br></div>
<div>Do you think that this is a good=C2=A0idea to consider using TI-LFA in=
 a Clos fabric ?=C2=A0</div>
<div><br></div>
<div>Thx,</div>
<div>R.</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Fri, Oct 18, 2019 at 10:53 PM Jeff=
 Tantsura &lt;<a href=3D"mailto:jefftant.ietf@gmail.com" target=3D"_blank">=
jefftant.ietf@gmail.com</a>&gt; wrote:<br></div>
<blockquote class=3D"gmail_quote" style=3D"margin:5px;padding-left:10px;bor=
der-left-width:thin;border-left-style:solid;border-left-color:rgb(230,126,3=
4)">
<div>
<div name=3D"messageBodySection">
<div dir=3D"auto">Hello Hirofumi,
<div dir=3D"auto"><br></div>
<div dir=3D"auto">Many thanks for sharing the use case.</div>
<div dir=3D"auto">Reading your slides, it looks like completely host based =
overlay design, e.g. no fabric switch is SRv6 aware, not using any of SRv6 =
functionality (TE, IPFRR, etc) and their solely function is to forward traf=
fic towards destinations of remote hosts over L3 IP fabric? In case of link=
/node failure it would use fast-rehash over ECMP rather that TI-LFA?</div>
<div dir=3D"auto"><br></div>
<div dir=3D"auto">Thanks in advance!<br></div>
</div>
</div>
<div name=3D"messageSignatureSection"><br>
<div>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D"messageReplySection">On Oct 17, 2019, 6:30 PM -0700, Hirofumi =
Ichihara &lt;<a href=3D"mailto:ichihara.hirofumi@gmail.com" target=3D"_blan=
k">ichihara.hirofumi@gmail.com</a>&gt;, wrote:<br>
<blockquote type=3D"cite" style=3D"margin:5px;padding-left:10px;border-left=
-width:thin;border-left-style:solid;border-left-color:rgb(52,152,219)">
<div dir=3D"ltr">
<div dir=3D"ltr">Hi,
<div><br></div>
<div>Let me introduce LINE&#39;s SRv6 DC use case as well. We have already =
deployed SRv6 network with our private cloud on production environment. Ple=
ase have a look at this slide( <a href=3D"https://speakerdeck.com/line_deve=
lopers/line-data-center-networking-with-srv6" target=3D"_blank">https://spe=
akerdeck.com/line_developers/line-data-center-networking-with-srv6</a>=C2=
=A0) if you&#39;re interested in our use case. And also we&#39;re intereste=
d in other DC use cases and implementations.. Please let me know if you hav=
e such information.</div>
<div><br></div>
<div>Thanks,</div>
<div>Hirofumi</div>
<div><br></div>
</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">2019=E5=B9=B410=E6=9C=8817=E6=97=A5(=
=E6=9C=A8) 21:31 Lizhenbin &lt;<a href=3D"mailto:lizhenbin@huawei.com" targ=
et=3D"_blank">lizhenbin@huawei.com</a>&gt;:<br></div>
<blockquote class=3D"gmail_quote" style=3D"margin:5px;padding-left:10px;bor=
der-left-width:thin;border-left-style:solid;border-left-color:rgb(211,84,0)=
">Hi Folks,<br>
We updated the SRv6 deployment draft as follows. There are two new deployme=
nts of SRv6 from China for reference:<br>
China Unicom and CERNET2. In the past two years, China pushed the IPv6 depl=
oyment and almost all the IP networks<br>
of operators achieve the goal &quot;IPv6 Ready&quot;. This provide a strong=
 base for SRv6 deployments which can help operators<br>
provide new services based on IPv6 infrastructure. Moreover the easy increm=
ental deployment advantage of SRv6 (refer<br>
to <a href=3D"https://tools.ietf.org/html/draft-xie-spring-srv6-network-mig=
ration-00" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html=
/draft-xie-spring-srv6-network-migration-00</a> ) facilitates the SRv6 depl=
oyments in the existing<br>
network. Besides the SRv6 deployments proposed in the draft, there will be =
more SRv6 for different application scenariosin<br>
the near future. These SRv6 deployments=C2=A0 are also promoting the IPv6 d=
eployment and more IPv6 traffic will be beared by<br>
these networks.=C2=A0<br>
<br>
<br>
<br>
Best Regards,<br>
Robin<br>
<br>
<br>
<br>
________________________________________<br>
=E5=8F=91=E4=BB=B6=E4=BA=BA: <a href=3D"mailto:internet-drafts@ietf.org" ta=
rget=3D"_blank">internet-drafts@ietf.org</a> [<a href=3D"mailto:internet-dr=
afts@ietf.org" target=3D"_blank">internet-drafts@ietf.org</a>]<br>
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B410=E6=9C=8815=E6=97=A5 1=
1:15<br>
=E6=94=B6=E4=BB=B6=E4=BA=BA: Zafar Ali; Clarence Filsfils; Lizhenbin; Sator=
u Matsushima<br>
=E4=B8=BB=E9=A2=98: New Version Notification for draft-matsushima-spring-sr=
v6-deployment-status-02.txt<br>
<br>
A new version of I-D, draft-matsushima-spring-srv6-deployment-status-02.txt=
<br>
has been successfully submitted by Zafar Ali and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-matsushima-spring-srv6-=
deployment-status<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A002<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 SRv6 Implementation and Deployment=
 Status<br>
Document date:=C2=A0 2019-10-14<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 19<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-matsushima-spring-srv6-deployment-status-02.txt" r=
el=3D"noreferrer" target=3D"_blank">https://www.ietf.org/internet-drafts/dr=
aft-matsushima-spring-srv6-deployment-status-02.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-matsushima-spring-srv6-deployment-status/" rel=3D"noreferre=
r" target=3D"_blank">https://datatracker.ietf.org/doc/draft-matsushima-spri=
ng-srv6-deployment-status/</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-matsushima-spring-srv6-deployment-status-02" rel=3D"noreferrer" targe=
t=3D"_blank">https://tools.ietf.org/html/draft-matsushima-spring-srv6-deplo=
yment-status-02</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org=
/doc/html/draft-matsushima-spring-srv6-deployment-status" rel=3D"noreferrer=
" target=3D"_blank">https://datatracker.ietf.org/doc/html/draft-matsushima-=
spring-srv6-deployment-status</a><br>
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.o=
rg/rfcdiff?url2=3Ddraft-matsushima-spring-srv6-deployment-status-02" rel=3D=
"noreferrer" target=3D"_blank">https://www.ietf.org/rfcdiff?url2=3Ddraft-ma=
tsushima-spring-srv6-deployment-status-02</a><br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This draft provides an overview of IPv6 Segment Routing (SRv6)=
<br>
=C2=A0 =C2=A0deployment status.=C2=A0 It lists various SRv6 features that h=
ave been<br>
=C2=A0 =C2=A0deployed in the production networks.=C2=A0 It also provides an=
 overview of<br>
=C2=A0 =C2=A0SRv6 implementation and interoperability testing status.<br>
<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
The IETF Secretariat<br>
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</blockquote></div>

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From: Rajesh M <mrajesh@juniper.net>
To: Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org>, "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>, Peter Psenak <ppsenak@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/UfN-v2TtdLImyjd1XWQrCX_4BBA>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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if we use T.Insert Mode for TI-LFA then PSP and USP Flavours are useful.



T.insert mode is  deprecated ? if Yes then PSP and USP Flavours also must b=
e deprecated as per me.



Thanks

Rajesh







Juniper Business Use Only
From: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org>
Sent: Saturday, October 19, 2019 7:59 AM
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>; Rajesh =
M <mrajesh@juniper.net>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com>; S=
PRING WG List <spring@ietf.org>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>; Ron Bonica <rbonica@juniper.net>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

MPLS world PSP will help in avoiding one more lookup at egress for VPN case=
s.

I feel both PSP and USP are not useful in case of SRV6.



Juniper Business Use Only
From: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:=
weibin.wang@nokia-sbell.com>>
Sent: Saturday, October 19, 2019 6:26 AM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; Rajesh M <m=
rajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40juniper.net@dmarc.=
ietf.org>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@=
cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

Hi Rajesh:
The answer to your question, I think, had better be provided by Authors of =
NET-PGM, You can also refer to Ron=1B$B!G=1B(Bs email previously one or two=
 days before who give some guess, I think it make sense, in addition , also=
 including processing-load mitigation in Last hop (egress PE);
Could you Pls explain the benefit of similar behavior in PHP of MPLS world.=
  I think it may be same.

--------------------------------------
Cheers !


WANG Weibin

From: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 20:18
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:we=
ibin.wang@nokia-sbell.com>>; Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.o=
rg<mailto:mrajesh=3D40juniper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamar=
il) <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>; SPRING WG List <spring=
@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Tj1RzlZX05hQXJCRb6NfbDmr4p543xmCTIQUDjQsIjiWMC6mn7vFFP39Imon9Has$>

I was more focused towards END.DT4 SID where behavior you mentioned is poss=
ible only if we do below optimization in https://tools.ietf.org/html/draft-=
dawra-bess-srv6-services-02<https://urldefense.com/v3/__https:/tools.ietf.o=
rg/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1w=
jCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$>  section 3.

when the received route is colored with an extended color community 'C' and=
 Next-Hop 'N', and the ingress PE has a valid SRv6 Policy (C, N) associated=
 with SID list <S1,S2, S3>, then the effective SR Policy is <S1, S2, SRv6-S=
ervice-SID>.Here if you see
S3 and SRv6-Service-SID both belong to Egress so s3 has been removed.


For you my query is removing only SRH header on PHP router will give what k=
ind of advantage ?

Thanks
Rajesh





Juniper Business Use Only
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Wang, Weibin (NSB - CN/Shanghai)
Sent: Friday, October 18, 2019 9:26 AM
To: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40jun=
iper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<m=
ailto:pcamaril@cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@i=
etf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

The value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent =
the last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 =
node copy IPv6 SID corresponding to [SL]=3D0 to DA field of IP packet, when=
 enable PSP flavor at same time, the penultimate SRv6 node will check the [=
SL] value, if it is 0, then pop SRH, these extra action is pseudocode of PS=
P. This logic has no problem.


--------------------------------------
Cheers !


WANG Weibin

From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Rajesh M
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 6:38
To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.co=
m>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

WANG had given below use case : But using existing PSP logic this will not =
work.
In below at PSP router updated SL will be 1 (since END.DT4 is still there) =
,so SRH pop won=1B$B!G=1B(Bt happen.



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }

WANG use case:
=1B$B!H=1B(BFor example in SRv6-based L3VPN service scenario, The ingress P=
E within SRv6-enabled domain can utilize SR-TE policy to enable TE-path fun=
ction when encapsulating and transiting L3VPN traffic, The Ingress PE push =
on customer packets with SID list representing SR-TE policy plus END.DT4 as=
 last SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be design=
ed to perform in related SRv6 endpoint. Imaging the PSP, the penultimate En=
dpoint can perform PSP, e.g. copy the last SID (END.DT4) of SRH to destinat=
ion field of IPv6 header and POP the SRH, then forwarding it toward egress =
PE identified by DA=1B$B!I=1B(B







Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.=
.com>>
Sent: Tuesday, October 15, 2019 10:13 PM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; SPRING WG L=
ist <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>

Rajesh,

This has already been replied less than one week ago... Please see:
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0Zpj=
VLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7HGIr9o9$>
https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzR=
ZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7P8QaU_7$>

Thanks,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D=
40juniper.net@dmarc.ietf.org>>
Date: Friday, 11 October 2019 at 03:47
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>, Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-networ=
k-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.org/=
html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c=
!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>


Wanted to know the use case where we only POP the SRH ?

4.16.1<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-sp=
ring-srv6-network-programming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31=
cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$>..  PSP: Penultimat=
e Segment Pop of the SRH

   The SRH processing of the End, End.X and End.T behaviors are

   modified: after the instruction "S14.  Update IPv6 DA with Segment

   List[Segments Left]" is executed, the following instructions must be

   executed as well:



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }



Juniper Business Use Only

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<pre><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-=
language:EN-US">if we use </span><span style=3D"mso-fareast-language:EN-US"=
>T.Insert </span><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;=
mso-fareast-language:EN-US">Mode for TI-LFA then </span>PSP and USP <span s=
tyle=3D"mso-fareast-language:EN-US">Flavours </span>are useful.<o:p></o:p><=
/pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>T.insert mode is &nbsp;deprecated ? if Yes then PSP and USP <span styl=
e=3D"mso-fareast-language:EN-US">Flavours also must be </span>deprecated as=
 per me.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Thanks<o:p></o:p></pre>
<pre>Rajesh<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:JA">From:</sp=
an></b><span style=3D"mso-fareast-language:JA"> Rajesh M &lt;mrajesh=3D40ju=
niper.net@dmarc.ietf.org&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 7:59 AM<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;weibin.wang@nokia-sbell.com=
&gt;; Rajesh M &lt;mrajesh@juniper.net&gt;; Pablo Camarillo (pcamaril) &lt;=
pcamaril@cisco.com&gt;; SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;; Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Subject:</b> RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-=
srv6-network-programming-04#page-24<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">MPLS worl=
d PSP will help in avoiding one more lookup at egress for VPN cases.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">I feel </=
span>both PSP and USP are not useful in case of SRV6.<span style=3D"mso-far=
east-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a=
 href=3D"mailto:weibin.wang@nokia-sbell.com">weibin.wang@nokia-sbell.com</a=
>&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 6:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarill=
o (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</=
a>&gt;;
 SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&=
gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Hi Rajesh:<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">The answer to your =
question, I think, had better be provided by Authors of NET-PGM, You can al=
so refer to Ron=1B$B!G=1B(Bs email previously one or two days before who gi=
ve some guess, I think it make sense, in addition
 , also including processing-load mitigation in Last hop (egress PE); <o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Could you Pls expla=
in the benefit of similar behavior in PHP of MPLS world. &nbsp;I think it m=
ay be same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt">------------------------------------=
--<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans=
-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">WANG Weibin&nbsp;
</span></b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roma=
n&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:JA">From:</sp=
an></b><span style=3D"mso-fareast-language:JA"> Rajesh M &lt;<a href=3D"mai=
lto:mrajesh@juniper.net">mrajesh@juniper.net</a>&gt;
<br>
<b>Sent:</b> 2019</span><span lang=3D"JA" style=3D"font-family:&quot;MS PGo=
thic&quot;,sans-serif;mso-fareast-language:JA">=1B$BG/=1B(B</span><span sty=
le=3D"mso-fareast-language:JA">10</span><span lang=3D"JA" style=3D"font-fam=
ily:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA">=1B$B7n=1B(B=
</span><span style=3D"mso-fareast-language:JA">18</span><span lang=3D"JA" s=
tyle=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:=
JA">=1B$BF|=1B(B</span><span style=3D"mso-fareast-language:JA">
 20:18<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;; Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh=3D40juniper.net@dmarc.ietf.org">mrajesh=3D40juniper.ne=
t@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pcamaril)
 &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;; SPRI=
NG WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;<b=
r>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Tj1RzlZX05hQXJCRb6NfbDmr4p543xmCTIQUDjQsIjiWMC6mn7vFFP39Imo=
n9Has$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">I was mor=
e focused towards END.DT4 SID where behavior you mentioned is possible only=
 if we do below optimization in
</span><a href=3D"https://urldefense.com/v3/__https:/tools.ietf.org/html/dr=
aft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1wjCRKLg4MMb=
WlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$">https://tools.ietf.org/html/draft-da=
wra-bess-srv6-services-02</a>&nbsp; section
 3.<span style=3D"mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">when the received route is colored with an extended color =
community 'C' and Next-Hop 'N', and the ingress PE has a valid SRv6 Policy =
(C, N) associated with SID list &lt;S1,S2, S3&gt;, then
 the effective SR Policy is &lt;S1, S2, SRv6-Service-SID&gt;.Here if you se=
e <o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red">S3 and SRv6-Service-SID both belong to Egress=
 so s3 has been removed.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red">For you my query is removing only SRH header =
on PHP router will give what kind of advantage ?<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">Thanks<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">Rajesh<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Wang, Weibin (NSB - CN/Shanghai)<br>
<b>Sent:</b> Friday, October 18, 2019 9:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.iet=
f.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pca=
maril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;=
; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>=
&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">The value of Segmen=
t Left field in SRH begin with 0, so [SL]=3D0 represent the last SID. in th=
is case, when [SL] decrease 1, and the penultimate SRv6 node copy IPv6 SID =
corresponding to [SL]=3D0 to DA field of
 IP packet, when enable PSP flavor at same time, the penultimate SRv6 node =
will check the [SL] value, if it is 0, then pop SRH, these extra action is =
pseudocode of PSP. This logic has no problem.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt">------------------------------------=
--<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans=
-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">WANG Weibin&nbsp;
</span></b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roma=
n&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 2019<span lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft =
YaHei&quot;,sans-serif">=1B$BG/=1B(B</span>10<span lang=3D"ZH-CN" style=3D"=
font-family:&quot;Microsoft YaHei&quot;,sans-serif">=1B$B7n=1B(B</span>18<s=
pan lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-se=
rif">=1B$BF|=1B(B</span> 6:38<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.=
com">pcamaril@cisco.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:sprin=
g@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">WANG had given below use case : But using existing P=
SP logic this will not work.<o:p></o:p></p>
<p class=3D"MsoNormal">In below at PSP router updated SL will be 1 (since E=
ND.DT4 is still there) ,so SRH pop won=1B$B!G=1B(Bt happen.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">WANG use case:<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white">=1B$B!H=1B(BFor example in SRv6-based L3VPN se=
rvice scenario, The ingress PE within SRv6-enabled domain can utilize SR-TE=
 policy to enable TE-path function when encapsulating
 and transiting L3VPN traffic, The Ingress PE push on customer packets with=
 SID list representing SR-TE policy plus END.DT4 as last SRv6 SID in SRH; S=
o I think, each flavor of PSP/USP/USD can be designed to perform in related=
 SRv6 endpoint. Imaging the PSP,
 the penultimate Endpoint can perform PSP, e.g. copy the last SID (END.DT4)=
 of SRH to destination field of IPv6 header and POP the SRH, then forwardin=
g it toward egress PE identified by DA=1B$B!I=1B(B<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;<a href=
=3D"mailto:pcamaril@cisco..com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 10:13 PM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spri=
ng@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3k=
DJQnV$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Rajesh,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This has already been replied less than one week ago=
... Please see:
<o:p></o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://urldefense.com/v3/__https:/mailar=
chive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W=
8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7HGIr9o9$">https://m=
ailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c</a><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES"><a href=3D"https://urldefense.com/=
v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfa=
k__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P=
8QaU_7$"><span lang=3D"EN-US">https://mailarchive.ietf.org/arch/msg/spring/=
WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span lang=3D"ES" styl=
e=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Friday, 11 October 2019 at 03:47<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc: </b>Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;, Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject: </b>[spring] <a href=3D"https://urldefense.com/v3/__https:/tool=
s.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!=
8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQn=
V$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">Wanted to know the use ca=
se where we only POP the SRH ?<o:p></o:p></span></pre>
<h4 style=3D"margin-left:.5in"><span lang=3D"ES"><a href=3D"https://urldefe=
nse.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-prog=
ramming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIh=
uJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$">4.16.1</a></span><a name=3D"section-4.16=
...1"></a><span lang=3D"ES" style=3D"font-family:&quot;Courier New&quot;">.=
.&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><span lang=3D"ES"><o:p></o:p=
></span></h4>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; The SRH proc=
essing of the End, End.X and End.T behaviors are<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; modified: af=
ter the instruction &quot;S14.&nbsp; Update IPv6 DA with Segment<o:p></o:p>=
</span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; List[Segment=
s Left]&quot; is executed, the following instructions must be<o:p></o:p></s=
pan></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; executed as =
well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<o:p></o:p></span><=
/pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Rajesh M <mrajesh@juniper.net>, Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org>, "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>, Ron Bonica <rbonica@juniper.net>
Thread-Topic: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
Thread-Index: AQHVg3el/QTSxmKUH02g4wcuLniNTadfbEpggABcrACAAIiUIIAA11oAgAAZXRCAABjmAIAABWUg
Date: Sat, 19 Oct 2019 04:22:03 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/-2zo9U43QN2qP-SGKYNHkDUxPCA>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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Hi Rajesh,

T.insert is definitely not deprecated. Please check https://mailarchive.iet=
f.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0 - I would suggest you go =
through the archives to get the history/context.

In fact, it is already deployed - check https://tools.ietf.org/html/draft-m=
atsushima-spring-srv6-deployment-status-02

Thanks,
Ketan

From: Rajesh M <mrajesh@juniper.net>
Sent: 19 October 2019 09:34
To: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org>; Wang, Weibin (NSB - =
CN/Shanghai) <weibin.wang@nokia-sbell.com>; Pablo Camarillo (pcamaril) <pca=
maril@cisco.com>; SPRING WG List <spring@ietf.org>; Peter Psenak (ppsenak) =
<ppsenak@cisco.com>; Ketan Talaulikar (ketant) <ketant@cisco.com>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>; Ron Bonica <rbonica@juniper.net>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24


if we use T.Insert Mode for TI-LFA then PSP and USP Flavours are useful.



T.insert mode is  deprecated ? if Yes then PSP and USP Flavours also must b=
e deprecated as per me.



Thanks

Rajesh







Juniper Business Use Only
From: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40j=
uniper.net@dmarc.ietf.org>>
Sent: Saturday, October 19, 2019 7:59 AM
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:we=
ibin.wang@nokia-sbell.com>>; Rajesh M <mrajesh@juniper.net<mailto:mrajesh@j=
uniper.net>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamari=
l@cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>; Ron Bonica <=
rbonica@juniper.net<mailto:rbonica@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

MPLS world PSP will help in avoiding one more lookup at egress for VPN case=
s.

I feel both PSP and USP are not useful in case of SRV6.



Juniper Business Use Only
From: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:=
weibin.wang@nokia-sbell.com>>
Sent: Saturday, October 19, 2019 6:26 AM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; Rajesh M <m=
rajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40juniper.net@dmarc.=
ietf.org>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@=
cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

Hi Rajesh:
The answer to your question, I think, had better be provided by Authors of =
NET-PGM, You can also refer to Ron=1B$B!G=1B(Bs email previously one or two=
 days before who give some guess, I think it make sense, in addition , also=
 including processing-load mitigation in Last hop (egress PE);
Could you Pls explain the benefit of similar behavior in PHP of MPLS world.=
  I think it may be same.

--------------------------------------
Cheers !


WANG Weibin

From: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 20:18
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:we=
ibin.wang@nokia-sbell.com>>; Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.o=
rg<mailto:mrajesh=3D40juniper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamar=
il) <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>; SPRING WG List <spring=
@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Tj1RzlZX05hQXJCRb6NfbDmr4p543xmCTIQUDjQsIjiWMC6mn7vFFP39Imon9Has$>

I was more focused towards END.DT4 SID where behavior you mentioned is poss=
ible only if we do below optimization in https://tools.ietf.org/html/draft-=
dawra-bess-srv6-services-02<https://urldefense.com/v3/__https:/tools.ietf.o=
rg/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1w=
jCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$>  section 3.

when the received route is colored with an extended color community 'C' and=
 Next-Hop 'N', and the ingress PE has a valid SRv6 Policy (C, N) associated=
 with SID list <S1,S2, S3>, then the effective SR Policy is <S1, S2, SRv6-S=
ervice-SID>.Here if you see
S3 and SRv6-Service-SID both belong to Egress so s3 has been removed.


For you my query is removing only SRH header on PHP router will give what k=
ind of advantage ?

Thanks
Rajesh





Juniper Business Use Only
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Wang, Weibin (NSB - CN/Shanghai)
Sent: Friday, October 18, 2019 9:26 AM
To: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40jun=
iper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<m=
ailto:pcamaril@cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@i=
etf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

The value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent =
the last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 =
node copy IPv6 SID corresponding to [SL]=3D0 to DA field of IP packet, when=
 enable PSP flavor at same time, the penultimate SRv6 node will check the [=
SL] value, if it is 0, then pop SRH, these extra action is pseudocode of PS=
P. This logic has no problem.


--------------------------------------
Cheers !


WANG Weibin

From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Rajesh M
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 6:38
To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.co=
m>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

WANG had given below use case : But using existing PSP logic this will not =
work.
In below at PSP router updated SL will be 1 (since END.DT4 is still there) =
,so SRH pop won=1B$B!G=1B(Bt happen.



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }

WANG use case:
=1B$B!H=1B(BFor example in SRv6-based L3VPN service scenario, The ingress P=
E within SRv6-enabled domain can utilize SR-TE policy to enable TE-path fun=
ction when encapsulating and transiting L3VPN traffic, The Ingress PE push =
on customer packets with SID list representing SR-TE policy plus END.DT4 as=
 last SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be design=
ed to perform in related SRv6 endpoint. Imaging the PSP, the penultimate En=
dpoint can perform PSP, e.g. copy the last SID (END.DT4) of SRH to destinat=
ion field of IPv6 header and POP the SRH, then forwarding it toward egress =
PE identified by DA=1B$B!I=1B(B







Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.=
.com>>
Sent: Tuesday, October 15, 2019 10:13 PM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; SPRING WG L=
ist <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>

Rajesh,

This has already been replied less than one week ago... Please see:
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0Zpj=
VLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7HGIr9o9$>
https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzR=
ZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7P8QaU_7$>

Thanks,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D=
40juniper.net@dmarc.ietf.org>>
Date: Friday, 11 October 2019 at 03:47
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>, Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-networ=
k-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.org/=
html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c=
!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>


Wanted to know the use case where we only POP the SRH ?

4.16.1<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-sp=
ring-srv6-network-programming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31=
cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$>..  PSP: Penultimat=
e Segment Pop of the SRH

   The SRH processing of the End, End.X and End.T behaviors are

   modified: after the instruction "S14.  Update IPv6 DA with Segment

   List[Segments Left]" is executed, the following instructions must be

   executed as well:



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }



Juniper Business Use Only

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<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Hi Rajesh=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">T.insert =
is definitely not deprecated. Please check
</span><a href=3D"https://mailarchive.ietf.org/arch/msg/spring/zRwYRZrKEwzM=
or2cXpYiag--_y0">https://mailarchive.ietf.org/arch/msg/spring/zRwYRZrKEwzMo=
r2cXpYiag--_y0</a> - I would suggest you go through the archives to get the=
 history/context.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In fact, it is already deployed &#8211; check <a hre=
f=3D"https://tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-st=
atus-02">
https://tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-status-=
02</a><span style=3D"mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Thanks,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Ketan<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:JA">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language:JA=
"> Rajesh M &lt;mrajesh@juniper.net&gt;
<br>
<b>Sent:</b> 19 October 2019 09:34<br>
<b>To:</b> Rajesh M &lt;mrajesh=3D40juniper.net@dmarc.ietf.org&gt;; Wang, W=
eibin (NSB - CN/Shanghai) &lt;weibin.wang@nokia-sbell.com&gt;; Pablo Camari=
llo (pcamaril) &lt;pcamaril@cisco.com&gt;; SPRING WG List &lt;spring@ietf.o=
rg&gt;; Peter Psenak (ppsenak) &lt;ppsenak@cisco.com&gt;; Ketan
 Talaulikar (ketant) &lt;ketant@cisco.com&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;; Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Subject:</b> RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-=
srv6-network-programming-04#page-24<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><span lang=3D"EN-US" style=3D"font-family:&quot;Calibri&quot;,sans-ser=
if;mso-fareast-language:EN-US">if we use </span><span lang=3D"EN-US" style=
=3D"mso-fareast-language:EN-US">T.Insert </span><span lang=3D"EN-US" style=
=3D"font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-US">=
Mode for TI-LFA then </span><span lang=3D"EN-US">PSP and USP </span><span l=
ang=3D"EN-US" style=3D"mso-fareast-language:EN-US">Flavours </span><span la=
ng=3D"EN-US">are useful.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">T.insert mode is &nbsp;deprecated ? if Yes then P=
SP and USP </span><span lang=3D"EN-US" style=3D"mso-fareast-language:EN-US"=
>Flavours also must be </span><span lang=3D"EN-US">deprecated as per me.<o:=
p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">Thanks<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Rajesh<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p=
re>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:JA">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language:JA=
"> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.ietf.org">m=
rajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 7:59 AM<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;; Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh@juniper.net">mrajesh@juniper.net</a>&gt;; Pablo Camari=
llo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com=
</a>&gt;;
 SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&=
gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;; Ron Bonica &lt;<a href=3D"mailto:rboni=
ca@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US">MPLS world PSP will help in avoiding one more lookup at egress for VP=
N cases.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US">I feel
</span><span lang=3D"EN-US">both PSP and USP are not useful in case of SRV6=
.</span><span lang=3D"EN-US" style=3D"mso-fareast-language:EN-US"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.w=
ang@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 6:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarill=
o (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</=
a>&gt;;
 SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&=
gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Hi R=
ajesh:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">The =
answer to your question, I think, had better be provided by Authors of NET-=
PGM, You can also refer to Ron=1B$B!G=1B(Bs email previously one or two day=
s before who give some guess, I think it make sense,
 in addition , also including processing-load mitigation in Last hop (egres=
s PE);
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Coul=
d you Pls explain the benefit of similar behavior in PHP of MPLS world. &nb=
sp;I think it may be same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:JA">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language:JA=
"> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juniper.net<=
/a>&gt;
<br>
<b>Sent:</b> 2019</span><span lang=3D"JA" style=3D"font-family:&quot;MS PGo=
thic&quot;,sans-serif;mso-fareast-language:JA">=1B$BG/=1B(B</span><span lan=
g=3D"EN-US" style=3D"mso-fareast-language:JA">10</span><span lang=3D"JA" st=
yle=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:J=
A">=1B$B7n=1B(B</span><span lang=3D"EN-US" style=3D"mso-fareast-language:JA=
">18</span><span lang=3D"JA" style=3D"font-family:&quot;MS PGothic&quot;,sa=
ns-serif;mso-fareast-language:JA">=1B$BF|=1B(B</span><span lang=3D"EN-US" s=
tyle=3D"mso-fareast-language:JA">
 20:18<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;; Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh=3D40juniper.net@dmarc.ietf.org">mrajesh=3D40juniper.ne=
t@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pcamaril)
 &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;; SPRI=
NG WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;<b=
r>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Tj1RzlZX05hQXJCRb6NfbDmr4p543xmCTIQUDjQsIjiWMC6mn7vFFP39Imo=
n9Has$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US">I was more focused towards END.DT4 SID where behavior you mentioned i=
s possible only if we do below optimization in
</span><span lang=3D"EN-US"><a href=3D"https://urldefense.com/v3/__https:/t=
ools.ietf.org/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQ=
hv3Ai4Cky1wjCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$">https://tools.i=
etf.org/html/draft-dawra-bess-srv6-services-02</a>&nbsp;
 section 3.</span><span lang=3D"EN-US" style=3D"mso-fareast-language:EN-US"=
><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">when the received route is colored with an =
extended color community 'C' and Next-Hop 'N', and the ingress PE has a val=
id SRv6 Policy (C, N) associated with SID list &lt;S1,S2,
 S3&gt;, then the effective SR Policy is &lt;S1, S2, SRv6-Service-SID&gt;.H=
ere if you see <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red">S3 and SRv6-Service-SID both b=
elong to Egress so s3 has been removed.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red">For you my query is removing o=
nly SRH header on PHP router will give what kind of advantage ?<o:p></o:p><=
/span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">Thanks<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">Rajesh<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Wang, Weibin (NSB - CN/Shanghai)<br>
<b>Sent:</b> Friday, October 18, 2019 9:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.iet=
f.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pca=
maril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;=
; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>=
&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">The =
value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent the =
last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 node=
 copy IPv6 SID corresponding to [SL]=3D0 to
 DA field of IP packet, when enable PSP flavor at same time, the penultimat=
e SRv6 node will check the [SL] value, if it is 0, then pop SRH, these extr=
a action is pseudocode of PSP. This logic has no problem.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 2019</span><span lang=3D"ZH-CN" style=3D"font-family:&quot;Mic=
rosoft YaHei&quot;,sans-serif">=1B$BG/=1B(B</span><span lang=3D"EN-US">10</=
span><span lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft YaHei&quot;,=
sans-serif">=1B$B7n=1B(B</span><span lang=3D"EN-US">18</span><span lang=3D"=
ZH-CN" style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif">=1B$BF|=
=1B(B</span><span lang=3D"EN-US">
 6:38<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.=
com">pcamaril@cisco.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:sprin=
g@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">WANG had given below use case :=
 But using existing PSP logic this will not work.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In below at PSP router updated =
SL will be 1 (since END.DT4 is still there) ,so SRH pop won=1B$B!G=1B(Bt ha=
ppen.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbs=
p;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbs=
p;&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">WANG use case:<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white">=1B$B!H=1B(BFor example in SRv6=
-based L3VPN service scenario, The ingress PE within SRv6-enabled domain ca=
n utilize SR-TE policy to enable TE-path function
 when encapsulating and transiting L3VPN traffic, The Ingress PE push on cu=
stomer packets with SID list representing SR-TE policy plus END.DT4 as last=
 SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be designed to=
 perform in related SRv6 endpoint.
 Imaging the PSP, the penultimate Endpoint can perform PSP, e.g. copy the l=
ast SID (END.DT4) of SRH to destination field of IPv6 header and POP the SR=
H, then forwarding it toward egress PE identified by DA=1B$B!I=1B(B<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco=
..com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 10:13 PM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spri=
ng@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3k=
DJQnV$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rajesh,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This has already been replied l=
ess than one week ago... Please see:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://urldefense.c=
om/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJj=
lg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9J=
w7HGIr9o9$">https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecX=
FxqJjlg_c</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES"><a href=3D"https://urldefense.com/=
v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfa=
k__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P=
8QaU_7$"><span lang=3D"EN-US">https://mailarchive.ietf.org/arch/msg/spring/=
WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><span lang=3D"EN-US"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span lang=3D"ES" st=
yle=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Friday, 11 October 2019 at 03:47<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc: </b>Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;, Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject: </b>[spring] <a href=3D"https://urldefense.com/v3/__https:/tool=
s.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!=
8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQn=
V$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES"><o:p>=
&nbsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">Wanted to know the use =
case where we only POP the SRH ?<o:p></o:p></span></pre>
<h4 style=3D"margin-left:36.0pt"><span lang=3D"ES"><a href=3D"https://urlde=
fense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-pr=
ogramming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7J=
IhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$">4.16.1</a></span><a name=3D"section-4.=
16...1"></a><span lang=3D"ES" style=3D"font-family:&quot;Courier New&quot;"=
>..&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><span lang=3D"ES"><o:p></o:p=
></span></h4>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; The SRH pr=
ocessing of the End, End.X and End.T behaviors are<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; modified: =
after the instruction &quot;S14.&nbsp; Update IPv6 DA with Segment<o:p></o:=
p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; List[Segme=
nts Left]&quot; is executed, the following instructions must be<o:p></o:p><=
/span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; executed a=
s well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbs=
p;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbs=
p;&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp=
;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:36.0pt;margin-bottom:.=
0001pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
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From: Rajesh M <mrajesh@juniper.net>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org>, "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>, Ron Bonica <rbonica@juniper.net>
Thread-Topic: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
Thread-Index: AQHVg3el/QTSxmKUH02g4wcuLniNTadfbEpggABcrACAAIiUIIAA11oAgAAZXRCAABjmAIAABWUggAAEv5A=
Date: Sat, 19 Oct 2019 04:33:44 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/AuifBAHfQx-6LbL3BTPL7PAmzdU>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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Content-Transfer-Encoding: quoted-printable

Then my suggestion is  move PSP and USP Flavours to draft-ietf-spring-srv6-=
net-pgm-insert , thanks.



Juniper Business Use Only
From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Saturday, October 19, 2019 9:52 AM
To: Rajesh M <mrajesh@juniper.net>; Rajesh M <mrajesh=3D40juniper.net@dmarc=
.ietf.org>; Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>;=
 Pablo Camarillo (pcamaril) <pcamaril@cisco.com>; SPRING WG List <spring@ie=
tf.org>; Peter Psenak (ppsenak) <ppsenak@cisco.com>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>; Ron Bonica <rbonica@juniper.net>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

Hi Rajesh,

T.insert is definitely not deprecated. Please check https://mailarchive.iet=
f.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0<https://urldefense.com/v3=
/__https:/mailarchive.ietf.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0_=
_;!8WoA6RjC81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfPKx=
oaW7$> - I would suggest you go through the archives to get the history/con=
text.

In fact, it is already deployed - check https://tools.ietf.org/html/draft-m=
atsushima-spring-srv6-deployment-status-02<https://urldefense.com/v3/__http=
s:/tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-status-02__;=
!8WoA6RjC81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfBrSP6=
fJ$>

Thanks,
Ketan

From: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>
Sent: 19 October 2019 09:34
To: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40jun=
iper.net@dmarc.ietf.org>>; Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@no=
kia-sbell.com<mailto:weibin.wang@nokia-sbell.com>>; Pablo Camarillo (pcamar=
il) <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>; SPRING WG List <spring=
@ietf.org<mailto:spring@ietf.org>>; Peter Psenak (ppsenak) <ppsenak@cisco.c=
om<mailto:ppsenak@cisco.com>>; Ketan Talaulikar (ketant) <ketant@cisco.com<=
mailto:ketant@cisco.com>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>; Ron Bonica <=
rbonica@juniper.net<mailto:rbonica@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24


if we use T.Insert Mode for TI-LFA then PSP and USP Flavours are useful.



T.insert mode is  deprecated ? if Yes then PSP and USP Flavours also must b=
e deprecated as per me.



Thanks

Rajesh







Juniper Business Use Only
From: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40j=
uniper.net@dmarc.ietf.org>>
Sent: Saturday, October 19, 2019 7:59 AM
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:we=
ibin.wang@nokia-sbell.com>>; Rajesh M <mrajesh@juniper.net<mailto:mrajesh@j=
uniper.net>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamari=
l@cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>; Ron Bonica <=
rbonica@juniper.net<mailto:rbonica@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfMDWG76b$>

MPLS world PSP will help in avoiding one more lookup at egress for VPN case=
s.

I feel both PSP and USP are not useful in case of SRV6.



Juniper Business Use Only
From: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:=
weibin.wang@nokia-sbell.com>>
Sent: Saturday, October 19, 2019 6:26 AM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; Rajesh M <m=
rajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40juniper.net@dmarc.=
ietf.org>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@=
cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfMDWG76b$>

Hi Rajesh:
The answer to your question, I think, had better be provided by Authors of =
NET-PGM, You can also refer to Ron=1B$B!G=1B(Bs email previously one or two=
 days before who give some guess, I think it make sense, in addition , also=
 including processing-load mitigation in Last hop (egress PE);
Could you Pls explain the benefit of similar behavior in PHP of MPLS world.=
  I think it may be same.

--------------------------------------
Cheers !


WANG Weibin

From: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 20:18
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:we=
ibin.wang@nokia-sbell.com>>; Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.o=
rg<mailto:mrajesh=3D40juniper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamar=
il) <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>; SPRING WG List <spring=
@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Tj1RzlZX05hQXJCRb6NfbDmr4p543xmCTIQUDjQsIjiWMC6mn7vFFP39Imon9Has$>

I was more focused towards END.DT4 SID where behavior you mentioned is poss=
ible only if we do below optimization in https://tools.ietf.org/html/draft-=
dawra-bess-srv6-services-02<https://urldefense.com/v3/__https:/tools.ietf.o=
rg/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1w=
jCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$>  section 3.

when the received route is colored with an extended color community 'C' and=
 Next-Hop 'N', and the ingress PE has a valid SRv6 Policy (C, N) associated=
 with SID list <S1,S2, S3>, then the effective SR Policy is <S1, S2, SRv6-S=
ervice-SID>.Here if you see
S3 and SRv6-Service-SID both belong to Egress so s3 has been removed.


For you my query is removing only SRH header on PHP router will give what k=
ind of advantage ?

Thanks
Rajesh





Juniper Business Use Only
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Wang, Weibin (NSB - CN/Shanghai)
Sent: Friday, October 18, 2019 9:26 AM
To: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40jun=
iper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<m=
ailto:pcamaril@cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@i=
etf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

The value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent =
the last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 =
node copy IPv6 SID corresponding to [SL]=3D0 to DA field of IP packet, when=
 enable PSP flavor at same time, the penultimate SRv6 node will check the [=
SL] value, if it is 0, then pop SRH, these extra action is pseudocode of PS=
P. This logic has no problem.


--------------------------------------
Cheers !


WANG Weibin

From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Rajesh M
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 6:38
To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.co=
m>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

WANG had given below use case : But using existing PSP logic this will not =
work.
In below at PSP router updated SL will be 1 (since END.DT4 is still there) =
,so SRH pop won=1B$B!G=1B(Bt happen.



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }

WANG use case:
=1B$B!H=1B(BFor example in SRv6-based L3VPN service scenario, The ingress P=
E within SRv6-enabled domain can utilize SR-TE policy to enable TE-path fun=
ction when encapsulating and transiting L3VPN traffic, The Ingress PE push =
on customer packets with SID list representing SR-TE policy plus END.DT4 as=
 last SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be design=
ed to perform in related SRv6 endpoint. Imaging the PSP, the penultimate En=
dpoint can perform PSP, e.g. copy the last SID (END.DT4) of SRH to destinat=
ion field of IPv6 header and POP the SRH, then forwarding it toward egress =
PE identified by DA=1B$B!I=1B(B







Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.=
.com>>
Sent: Tuesday, October 15, 2019 10:13 PM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; SPRING WG L=
ist <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>

Rajesh,

This has already been replied less than one week ago... Please see:
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0Zpj=
VLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7HGIr9o9$>
https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzR=
ZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7P8QaU_7$>

Thanks,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D=
40juniper.net@dmarc.ietf.org>>
Date: Friday, 11 October 2019 at 03:47
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>, Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-networ=
k-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.org/=
html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c=
!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>


Wanted to know the use case where we only POP the SRH ?

4.16.1<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-sp=
ring-srv6-network-programming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31=
cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$>..  PSP: Penultimat=
e Segment Pop of the SRH

   The SRH processing of the End, End.X and End.T behaviors are

   modified: after the instruction "S14.  Update IPv6 DA with Segment

   List[Segments Left]" is executed, the following instructions must be

   executed as well:



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }



Juniper Business Use Only

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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Then my s=
uggestion is &nbsp;move
</span>PSP and USP <span style=3D"mso-fareast-language:EN-US">Flavours to <=
/span><span style=3D"font-size:9.5pt;font-family:Menlo;color:#212529;backgr=
ound:white">draft-ietf-spring-srv6-net-pgm-insert , thanks.</span><span sty=
le=3D"mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:ZH-TW">From:<=
/span></b><span style=3D"mso-fareast-language:ZH-TW"> Ketan Talaulikar (ket=
ant) &lt;ketant@cisco.com&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 9:52 AM<br>
<b>To:</b> Rajesh M &lt;mrajesh@juniper.net&gt;; Rajesh M &lt;mrajesh=3D40j=
uniper.net@dmarc.ietf.org&gt;; Wang, Weibin (NSB - CN/Shanghai) &lt;weibin.=
wang@nokia-sbell.com&gt;; Pablo Camarillo (pcamaril) &lt;pcamaril@cisco.com=
&gt;; SPRING WG List &lt;spring@ietf.org&gt;; Peter Psenak (ppsenak)
 &lt;ppsenak@cisco.com&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;; Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Subject:</b> RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-=
srv6-network-programming-04#page-24<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">Hi Rajesh,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">T.insert is definitely not deprecated. Please check
</span><span lang=3D"EN-IN"><a href=3D"https://urldefense.com/v3/__https:/m=
ailarchive.ietf.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0__;!8WoA6RjC=
81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfPKxoaW7$">http=
s://mailarchive.ietf.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0</a>
 - I would suggest you go through the archives to get the history/context.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN">In fact, it is already deployed=
 &#8211; check <a href=3D"https://urldefense.com/v3/__https:/tools.ietf.org=
/html/draft-matsushima-spring-srv6-deployment-status-02__;!8WoA6RjC81c!SDnS=
O1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfBrSP6fJ$">
https://tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-status-=
02</a></span><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-US"><o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">Ketan<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:JA">From:</sp=
an></b><span style=3D"mso-fareast-language:JA"> Rajesh M &lt;<a href=3D"mai=
lto:mrajesh@juniper.net">mrajesh@juniper.net</a>&gt;
<br>
<b>Sent:</b> 19 October 2019 09:34<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.iet=
f.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Wang, Weibin (NSB - =
CN/Shanghai) &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com">weibin.wang=
@nokia-sbell.com</a>&gt;; Pablo Camarillo (pcamaril)
 &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;; SPRI=
NG WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;; =
Peter Psenak (ppsenak) &lt;<a href=3D"mailto:ppsenak@cisco.com">ppsenak@cis=
co.com</a>&gt;; Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisc=
o.com">ketant@cisco.com</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;; Ron Bonica &lt;<a href=3D"mailto:rboni=
ca@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-IN"><o:p>&nbsp;</o:p></span></p>
<pre><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-=
language:EN-US">if we use </span><span style=3D"mso-fareast-language:EN-US"=
>T.Insert </span><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;=
mso-fareast-language:EN-US">Mode for TI-LFA then </span>PSP and USP <span s=
tyle=3D"mso-fareast-language:EN-US">Flavours </span>are useful.<o:p></o:p><=
/pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>T.insert mode is &nbsp;deprecated ? if Yes then PSP and USP <span styl=
e=3D"mso-fareast-language:EN-US">Flavours also must be </span>deprecated as=
 per me.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Thanks<o:p></o:p></pre>
<pre>Rajesh<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:JA">From:</sp=
an></b><span style=3D"mso-fareast-language:JA"> Rajesh M &lt;<a href=3D"mai=
lto:mrajesh=3D40juniper.net@dmarc.ietf.org">mrajesh=3D40juniper.net@dmarc.i=
etf.org</a>&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 7:59 AM<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;; Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh@juniper.net">mrajesh@juniper.net</a>&gt;; Pablo Camari=
llo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com=
</a>&gt;;
 SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&=
gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;; Ron Bonica &lt;<a href=3D"mailto:rboni=
ca@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfMD=
WG76b$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">MPLS worl=
d PSP will help in avoiding one more lookup at egress for VPN cases.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">I feel </=
span>both PSP and USP are not useful in case of SRV6.<span style=3D"mso-far=
east-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a=
 href=3D"mailto:weibin.wang@nokia-sbell.com">weibin.wang@nokia-sbell.com</a=
>&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 6:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarill=
o (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</=
a>&gt;;
 SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&=
gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfMD=
WG76b$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Hi Rajesh:<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">The answer to your =
question, I think, had better be provided by Authors of NET-PGM, You can al=
so refer to Ron=1B$B!G=1B(Bs email previously one or two days before who gi=
ve some guess, I think it make sense, in addition
 , also including processing-load mitigation in Last hop (egress PE); <o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Could you Pls expla=
in the benefit of similar behavior in PHP of MPLS world. &nbsp;I think it m=
ay be same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt">------------------------------------=
--<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans=
-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">WANG Weibin&nbsp;
</span></b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roma=
n&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:JA">From:</sp=
an></b><span style=3D"mso-fareast-language:JA"> Rajesh M &lt;<a href=3D"mai=
lto:mrajesh@juniper.net">mrajesh@juniper.net</a>&gt;
<br>
<b>Sent:</b> 2019</span><span lang=3D"JA" style=3D"font-family:&quot;MS PGo=
thic&quot;,sans-serif;mso-fareast-language:JA">=1B$BG/=1B(B</span><span sty=
le=3D"mso-fareast-language:JA">10</span><span lang=3D"JA" style=3D"font-fam=
ily:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA">=1B$B7n=1B(B=
</span><span style=3D"mso-fareast-language:JA">18</span><span lang=3D"JA" s=
tyle=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:=
JA">=1B$BF|=1B(B</span><span style=3D"mso-fareast-language:JA">
 20:18<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;; Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh=3D40juniper.net@dmarc.ietf.org">mrajesh=3D40juniper.ne=
t@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pcamaril)
 &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;; SPRI=
NG WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;<b=
r>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Tj1RzlZX05hQXJCRb6NfbDmr4p543xmCTIQUDjQsIjiWMC6mn7vFFP39Imo=
n9Has$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">I was mor=
e focused towards END.DT4 SID where behavior you mentioned is possible only=
 if we do below optimization in
</span><a href=3D"https://urldefense.com/v3/__https:/tools.ietf.org/html/dr=
aft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1wjCRKLg4MMb=
WlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$">https://tools.ietf.org/html/draft-da=
wra-bess-srv6-services-02</a>&nbsp; section
 3.<span style=3D"mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">when the received route is colored with an extended color =
community 'C' and Next-Hop 'N', and the ingress PE has a valid SRv6 Policy =
(C, N) associated with SID list &lt;S1,S2, S3&gt;, then
 the effective SR Policy is &lt;S1, S2, SRv6-Service-SID&gt;.Here if you se=
e <o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red">S3 and SRv6-Service-SID both belong to Egress=
 so s3 has been removed.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red">For you my query is removing only SRH header =
on PHP router will give what kind of advantage ?<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">Thanks<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">Rajesh<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Wang, Weibin (NSB - CN/Shanghai)<br>
<b>Sent:</b> Friday, October 18, 2019 9:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.iet=
f.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pca=
maril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;=
; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>=
&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">The value of Segmen=
t Left field in SRH begin with 0, so [SL]=3D0 represent the last SID. in th=
is case, when [SL] decrease 1, and the penultimate SRv6 node copy IPv6 SID =
corresponding to [SL]=3D0 to DA field of
 IP packet, when enable PSP flavor at same time, the penultimate SRv6 node =
will check the [SL] value, if it is 0, then pop SRH, these extra action is =
pseudocode of PSP. This logic has no problem.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt">------------------------------------=
--<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans=
-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">WANG Weibin&nbsp;
</span></b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roma=
n&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 2019<span lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft =
YaHei&quot;,sans-serif">=1B$BG/=1B(B</span>10<span lang=3D"ZH-CN" style=3D"=
font-family:&quot;Microsoft YaHei&quot;,sans-serif">=1B$B7n=1B(B</span>18<s=
pan lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-se=
rif">=1B$BF|=1B(B</span> 6:38<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.=
com">pcamaril@cisco.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:sprin=
g@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">WANG had given below use case : But using existing P=
SP logic this will not work.<o:p></o:p></p>
<p class=3D"MsoNormal">In below at PSP router updated SL will be 1 (since E=
ND.DT4 is still there) ,so SRH pop won=1B$B!G=1B(Bt happen.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">WANG use case:<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white">=1B$B!H=1B(BFor example in SRv6-based L3VPN se=
rvice scenario, The ingress PE within SRv6-enabled domain can utilize SR-TE=
 policy to enable TE-path function when encapsulating
 and transiting L3VPN traffic, The Ingress PE push on customer packets with=
 SID list representing SR-TE policy plus END.DT4 as last SRv6 SID in SRH; S=
o I think, each flavor of PSP/USP/USD can be designed to perform in related=
 SRv6 endpoint. Imaging the PSP,
 the penultimate Endpoint can perform PSP, e.g. copy the last SID (END.DT4)=
 of SRH to destination field of IPv6 header and POP the SRH, then forwardin=
g it toward egress PE identified by DA=1B$B!I=1B(B<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;<a href=
=3D"mailto:pcamaril@cisco..com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 10:13 PM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spri=
ng@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3k=
DJQnV$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Rajesh,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This has already been replied less than one week ago=
... Please see:
<o:p></o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://urldefense.com/v3/__https:/mailar=
chive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W=
8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7HGIr9o9$">https://m=
ailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c</a><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES"><a href=3D"https://urldefense.com/=
v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfa=
k__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P=
8QaU_7$"><span lang=3D"EN-US">https://mailarchive.ietf.org/arch/msg/spring/=
WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span lang=3D"ES" styl=
e=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Friday, 11 October 2019 at 03:47<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc: </b>Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;, Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject: </b>[spring] <a href=3D"https://urldefense.com/v3/__https:/tool=
s.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!=
8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQn=
V$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">Wanted to know the use ca=
se where we only POP the SRH ?<o:p></o:p></span></pre>
<h4 style=3D"margin-left:.5in"><span lang=3D"ES"><a href=3D"https://urldefe=
nse.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-prog=
ramming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIh=
uJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$">4.16.1</a></span><a name=3D"section-4.16=
...1"></a><span lang=3D"ES" style=3D"font-family:&quot;Courier New&quot;">.=
.&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><span lang=3D"ES"><o:p></o:p=
></span></h4>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; The SRH proc=
essing of the End, End.X and End.T behaviors are<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; modified: af=
ter the instruction &quot;S14.&nbsp; Update IPv6 DA with Segment<o:p></o:p>=
</span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; List[Segment=
s Left]&quot; is executed, the following instructions must be<o:p></o:p></s=
pan></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; executed as =
well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<o:p></o:p></span><=
/pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Rajesh M <mrajesh@juniper.net>, Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org>, "Wang, Weibin (NSB - CN/Shanghai)" <weibin.wang@nokia-sbell.com>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>
CC: Srihari Sangli <ssangli@juniper.net>, Shraddha Hegde <shraddha@juniper.net>, Ron Bonica <rbonica@juniper.net>
Thread-Topic: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/Tiuxz1swwxzaW4bov2UzJzeBEcQ>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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Content-Transfer-Encoding: quoted-printable

Again, request to catch up on the archives please.

https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak


From: Rajesh M <mrajesh@juniper.net>
Sent: 19 October 2019 10:04
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; Rajesh M <mrajesh=3D40jun=
iper.net@dmarc.ietf.org>; Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nok=
ia-sbell.com>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com>; SPRING WG L=
ist <spring@ietf.org>; Peter Psenak (ppsenak) <ppsenak@cisco.com>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>; Ron Bonica <rbonica@juniper.net>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

Then my suggestion is  move PSP and USP Flavours to draft-ietf-spring-srv6-=
net-pgm-insert , thanks.



Juniper Business Use Only
From: Ketan Talaulikar (ketant) <ketant@cisco.com<mailto:ketant@cisco.com>>
Sent: Saturday, October 19, 2019 9:52 AM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; Rajesh M <m=
rajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40juniper.net@dmarc.=
ietf.org>>; Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<m=
ailto:weibin.wang@nokia-sbell.com>>; Pablo Camarillo (pcamaril) <pcamaril@c=
isco.com<mailto:pcamaril@cisco.com>>; SPRING WG List <spring@ietf.org<mailt=
o:spring@ietf.org>>; Peter Psenak (ppsenak) <ppsenak@cisco.com<mailto:ppsen=
ak@cisco.com>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>; Ron Bonica <=
rbonica@juniper.net<mailto:rbonica@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

Hi Rajesh,

T.insert is definitely not deprecated. Please check https://mailarchive.iet=
f.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0<https://urldefense.com/v3=
/__https:/mailarchive.ietf.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0_=
_;!8WoA6RjC81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfPKx=
oaW7$> - I would suggest you go through the archives to get the history/con=
text.

In fact, it is already deployed - check https://tools.ietf.org/html/draft-m=
atsushima-spring-srv6-deployment-status-02<https://urldefense.com/v3/__http=
s:/tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-status-02__;=
!8WoA6RjC81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfBrSP6=
fJ$>

Thanks,
Ketan

From: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>
Sent: 19 October 2019 09:34
To: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40jun=
iper.net@dmarc.ietf.org>>; Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@no=
kia-sbell.com<mailto:weibin.wang@nokia-sbell.com>>; Pablo Camarillo (pcamar=
il) <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>; SPRING WG List <spring=
@ietf.org<mailto:spring@ietf.org>>; Peter Psenak (ppsenak) <ppsenak@cisco.c=
om<mailto:ppsenak@cisco.com>>; Ketan Talaulikar (ketant) <ketant@cisco.com<=
mailto:ketant@cisco.com>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>; Ron Bonica <=
rbonica@juniper.net<mailto:rbonica@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24


if we use T.Insert Mode for TI-LFA then PSP and USP Flavours are useful.



T.insert mode is  deprecated ? if Yes then PSP and USP Flavours also must b=
e deprecated as per me.



Thanks

Rajesh







Juniper Business Use Only
From: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40j=
uniper.net@dmarc.ietf.org>>
Sent: Saturday, October 19, 2019 7:59 AM
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:we=
ibin.wang@nokia-sbell.com>>; Rajesh M <mrajesh@juniper.net<mailto:mrajesh@j=
uniper.net>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamari=
l@cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>; Ron Bonica <=
rbonica@juniper.net<mailto:rbonica@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfMDWG76b$>

MPLS world PSP will help in avoiding one more lookup at egress for VPN case=
s.

I feel both PSP and USP are not useful in case of SRV6.



Juniper Business Use Only
From: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:=
weibin.wang@nokia-sbell.com>>
Sent: Saturday, October 19, 2019 6:26 AM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; Rajesh M <m=
rajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40juniper.net@dmarc.=
ietf.org>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@=
cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfMDWG76b$>

Hi Rajesh:
The answer to your question, I think, had better be provided by Authors of =
NET-PGM, You can also refer to Ron=1B$B!G=1B(Bs email previously one or two=
 days before who give some guess, I think it make sense, in addition , also=
 including processing-load mitigation in Last hop (egress PE);
Could you Pls explain the benefit of similar behavior in PHP of MPLS world.=
  I think it may be same.

--------------------------------------
Cheers !


WANG Weibin

From: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 20:18
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:we=
ibin.wang@nokia-sbell.com>>; Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.o=
rg<mailto:mrajesh=3D40juniper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamar=
il) <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>; SPRING WG List <spring=
@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Tj1RzlZX05hQXJCRb6NfbDmr4p543xmCTIQUDjQsIjiWMC6mn7vFFP39Imon9Has$>

I was more focused towards END.DT4 SID where behavior you mentioned is poss=
ible only if we do below optimization in https://tools.ietf.org/html/draft-=
dawra-bess-srv6-services-02<https://urldefense.com/v3/__https:/tools.ietf.o=
rg/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1w=
jCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$>  section 3.

when the received route is colored with an extended color community 'C' and=
 Next-Hop 'N', and the ingress PE has a valid SRv6 Policy (C, N) associated=
 with SID list <S1,S2, S3>, then the effective SR Policy is <S1, S2, SRv6-S=
ervice-SID>.Here if you see
S3 and SRv6-Service-SID both belong to Egress so s3 has been removed.


For you my query is removing only SRH header on PHP router will give what k=
ind of advantage ?

Thanks
Rajesh





Juniper Business Use Only
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Wang, Weibin (NSB - CN/Shanghai)
Sent: Friday, October 18, 2019 9:26 AM
To: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40jun=
iper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<m=
ailto:pcamaril@cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@i=
etf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

The value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent =
the last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 =
node copy IPv6 SID corresponding to [SL]=3D0 to DA field of IP packet, when=
 enable PSP flavor at same time, the penultimate SRv6 node will check the [=
SL] value, if it is 0, then pop SRH, these extra action is pseudocode of PS=
P. This logic has no problem.


--------------------------------------
Cheers !


WANG Weibin

From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Rajesh M
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 6:38
To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.co=
m>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

WANG had given below use case : But using existing PSP logic this will not =
work.
In below at PSP router updated SL will be 1 (since END.DT4 is still there) =
,so SRH pop won=1B$B!G=1B(Bt happen.



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }

WANG use case:
=1B$B!H=1B(BFor example in SRv6-based L3VPN service scenario, The ingress P=
E within SRv6-enabled domain can utilize SR-TE policy to enable TE-path fun=
ction when encapsulating and transiting L3VPN traffic, The Ingress PE push =
on customer packets with SID list representing SR-TE policy plus END.DT4 as=
 last SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be design=
ed to perform in related SRv6 endpoint. Imaging the PSP, the penultimate En=
dpoint can perform PSP, e.g. copy the last SID (END.DT4) of SRH to destinat=
ion field of IPv6 header and POP the SRH, then forwarding it toward egress =
PE identified by DA=1B$B!I=1B(B







Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.=
.com>>
Sent: Tuesday, October 15, 2019 10:13 PM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; SPRING WG L=
ist <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>

Rajesh,

This has already been replied less than one week ago... Please see:
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0Zpj=
VLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7HGIr9o9$>
https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzR=
ZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7P8QaU_7$>

Thanks,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D=
40juniper.net@dmarc.ietf.org>>
Date: Friday, 11 October 2019 at 03:47
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>, Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-networ=
k-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.org/=
html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c=
!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>


Wanted to know the use case where we only POP the SRH ?

4.16.1<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-sp=
ring-srv6-network-programming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31=
cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$>..  PSP: Penultimat=
e Segment Pop of the SRH

   The SRH processing of the End, End.X and End.T behaviors are

   modified: after the instruction "S14.  Update IPv6 DA with Segment

   List[Segments Left]" is executed, the following instructions must be

   executed as well:



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }



Juniper Business Use Only

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Again, re=
quest to catch up on the archives please.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><a href=3D"https://mailarchive.ietf.org/arch/msg/spr=
ing/WrYzRZC0HKVgBYaYMCQVcTWrfak">https://mailarchive.ietf.org/arch/msg/spri=
ng/WrYzRZC0HKVgBYaYMCQVcTWrfak</a><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:ZH-TW">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language=
:ZH-TW"> Rajesh M &lt;mrajesh@juniper.net&gt;
<br>
<b>Sent:</b> 19 October 2019 10:04<br>
<b>To:</b> Ketan Talaulikar (ketant) &lt;ketant@cisco.com&gt;; Rajesh M &lt=
;mrajesh=3D40juniper.net@dmarc.ietf.org&gt;; Wang, Weibin (NSB - CN/Shangha=
i) &lt;weibin.wang@nokia-sbell.com&gt;; Pablo Camarillo (pcamaril) &lt;pcam=
aril@cisco.com&gt;; SPRING WG List &lt;spring@ietf.org&gt;; Peter
 Psenak (ppsenak) &lt;ppsenak@cisco.com&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;; Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Subject:</b> RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-=
srv6-network-programming-04#page-24<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US">Then my suggestion is &nbsp;move
</span><span lang=3D"EN-US">PSP and USP </span><span lang=3D"EN-US" style=
=3D"mso-fareast-language:EN-US">Flavours to
</span><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-family:Menlo;colo=
r:#212529;background:white">draft-ietf-spring-srv6-net-pgm-insert , thanks.=
</span><span lang=3D"EN-US" style=3D"mso-fareast-language:EN-US"><o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:ZH-TW">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language=
:ZH-TW"> Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.com">=
ketant@cisco.com</a>&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 9:52 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Wang, Weibin (=
NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com">weibi=
n.wang@nokia-sbell.com</a>&gt;;
 Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcama=
ril@cisco.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org=
">spring@ietf.org</a>&gt;; Peter Psenak (ppsenak) &lt;<a href=3D"mailto:pps=
enak@cisco.com">ppsenak@cisco.com</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;; Ron Bonica &lt;<a href=3D"mailto:rboni=
ca@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Hi Rajesh=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">T.insert =
is definitely not deprecated. Please check
</span><a href=3D"https://urldefense.com/v3/__https:/mailarchive.ietf.org/a=
rch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0__;!8WoA6RjC81c!SDnSO1UkM_GXHuCak=
ygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfPKxoaW7$">https://mailarchive.ietf.=
org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0</a>
 - I would suggest you go through the archives to get the history/context.<=
o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In fact, it is already deployed &#8211; check <a hre=
f=3D"https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-matsushim=
a-spring-srv6-deployment-status-02__;!8WoA6RjC81c!SDnSO1UkM_GXHuCakygVPB3Z6=
_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfBrSP6fJ$">
https://tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-status-=
02</a><span style=3D"mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Thanks,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Ketan<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:JA">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language:JA=
"> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juniper.net<=
/a>&gt;
<br>
<b>Sent:</b> 19 October 2019 09:34<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.iet=
f.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Wang, Weibin (NSB - =
CN/Shanghai) &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com">weibin.wang=
@nokia-sbell.com</a>&gt;; Pablo Camarillo (pcamaril)
 &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;; SPRI=
NG WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;; =
Peter Psenak (ppsenak) &lt;<a href=3D"mailto:ppsenak@cisco.com">ppsenak@cis=
co.com</a>&gt;; Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisc=
o.com">ketant@cisco.com</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;; Ron Bonica &lt;<a href=3D"mailto:rboni=
ca@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><span lang=3D"EN-US" style=3D"font-family:&quot;Calibri&quot;,sans-ser=
if;mso-fareast-language:EN-US">if we use </span><span lang=3D"EN-US" style=
=3D"mso-fareast-language:EN-US">T.Insert </span><span lang=3D"EN-US" style=
=3D"font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-US">=
Mode for TI-LFA then </span><span lang=3D"EN-US">PSP and USP </span><span l=
ang=3D"EN-US" style=3D"mso-fareast-language:EN-US">Flavours </span><span la=
ng=3D"EN-US">are useful.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">T.insert mode is &nbsp;deprecated ? if Yes then P=
SP and USP </span><span lang=3D"EN-US" style=3D"mso-fareast-language:EN-US"=
>Flavours also must be </span><span lang=3D"EN-US">deprecated as per me.<o:=
p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">Thanks<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Rajesh<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p=
re>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:JA">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language:JA=
"> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.ietf.org">m=
rajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 7:59 AM<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;; Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh@juniper.net">mrajesh@juniper.net</a>&gt;; Pablo Camari=
llo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com=
</a>&gt;;
 SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&=
gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;; Ron Bonica &lt;<a href=3D"mailto:rboni=
ca@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfMD=
WG76b$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US">MPLS world PSP will help in avoiding one more lookup at egress for VP=
N cases.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US">I feel
</span><span lang=3D"EN-US">both PSP and USP are not useful in case of SRV6=
.</span><span lang=3D"EN-US" style=3D"mso-fareast-language:EN-US"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.w=
ang@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 6:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarill=
o (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</=
a>&gt;;
 SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&=
gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!SDnSO1UkM_GXHuCakygVPB3Z6_a_KuxAxRQIlnu86NF7h-n7dsCfdplAfMD=
WG76b$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Hi R=
ajesh:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">The =
answer to your question, I think, had better be provided by Authors of NET-=
PGM, You can also refer to Ron=1B$B!G=1B(Bs email previously one or two day=
s before who give some guess, I think it make sense,
 in addition , also including processing-load mitigation in Last hop (egres=
s PE);
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Coul=
d you Pls explain the benefit of similar behavior in PHP of MPLS world. &nb=
sp;I think it may be same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:JA">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language:JA=
"> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juniper.net<=
/a>&gt;
<br>
<b>Sent:</b> 2019</span><span lang=3D"JA" style=3D"font-family:&quot;MS PGo=
thic&quot;,sans-serif;mso-fareast-language:JA">=1B$BG/=1B(B</span><span lan=
g=3D"EN-US" style=3D"mso-fareast-language:JA">10</span><span lang=3D"JA" st=
yle=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:J=
A">=1B$B7n=1B(B</span><span lang=3D"EN-US" style=3D"mso-fareast-language:JA=
">18</span><span lang=3D"JA" style=3D"font-family:&quot;MS PGothic&quot;,sa=
ns-serif;mso-fareast-language:JA">=1B$BF|=1B(B</span><span lang=3D"EN-US" s=
tyle=3D"mso-fareast-language:JA">
 20:18<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;; Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh=3D40juniper.net@dmarc.ietf.org">mrajesh=3D40juniper.ne=
t@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pcamaril)
 &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;; SPRI=
NG WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;<b=
r>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Tj1RzlZX05hQXJCRb6NfbDmr4p543xmCTIQUDjQsIjiWMC6mn7vFFP39Imo=
n9Has$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US">I was more focused towards END.DT4 SID where behavior you mentioned i=
s possible only if we do below optimization in
</span><span lang=3D"EN-US"><a href=3D"https://urldefense.com/v3/__https:/t=
ools.ietf.org/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQ=
hv3Ai4Cky1wjCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$">https://tools.i=
etf.org/html/draft-dawra-bess-srv6-services-02</a>&nbsp;
 section 3.</span><span lang=3D"EN-US" style=3D"mso-fareast-language:EN-US"=
><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">when the received route is colored with an =
extended color community 'C' and Next-Hop 'N', and the ingress PE has a val=
id SRv6 Policy (C, N) associated with SID list &lt;S1,S2,
 S3&gt;, then the effective SR Policy is &lt;S1, S2, SRv6-Service-SID&gt;.H=
ere if you see <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red">S3 and SRv6-Service-SID both b=
elong to Egress so s3 has been removed.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red">For you my query is removing o=
nly SRH header on PHP router will give what kind of advantage ?<o:p></o:p><=
/span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">Thanks<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">Rajesh<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Wang, Weibin (NSB - CN/Shanghai)<br>
<b>Sent:</b> Friday, October 18, 2019 9:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.iet=
f.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pca=
maril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;=
; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>=
&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">The =
value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent the =
last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 node=
 copy IPv6 SID corresponding to [SL]=3D0 to
 DA field of IP packet, when enable PSP flavor at same time, the penultimat=
e SRv6 node will check the [SL] value, if it is 0, then pop SRH, these extr=
a action is pseudocode of PSP. This logic has no problem.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 2019</span><span lang=3D"ZH-CN" style=3D"font-family:&quot;Mic=
rosoft YaHei&quot;,sans-serif">=1B$BG/=1B(B</span><span lang=3D"EN-US">10</=
span><span lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft YaHei&quot;,=
sans-serif">=1B$B7n=1B(B</span><span lang=3D"EN-US">18</span><span lang=3D"=
ZH-CN" style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif">=1B$BF|=
=1B(B</span><span lang=3D"EN-US">
 6:38<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.=
com">pcamaril@cisco.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:sprin=
g@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">WANG had given below use case :=
 But using existing PSP logic this will not work.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In below at PSP router updated =
SL will be 1 (since END.DT4 is still there) ,so SRH pop won=1B$B!G=1B(Bt ha=
ppen.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbs=
p;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbs=
p;&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">WANG use case:<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white">=1B$B!H=1B(BFor example in SRv6=
-based L3VPN service scenario, The ingress PE within SRv6-enabled domain ca=
n utilize SR-TE policy to enable TE-path function
 when encapsulating and transiting L3VPN traffic, The Ingress PE push on cu=
stomer packets with SID list representing SR-TE policy plus END.DT4 as last=
 SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be designed to=
 perform in related SRv6 endpoint.
 Imaging the PSP, the penultimate Endpoint can perform PSP, e.g. copy the l=
ast SID (END.DT4) of SRH to destination field of IPv6 header and POP the SR=
H, then forwarding it toward egress PE identified by DA=1B$B!I=1B(B<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco=
..com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 10:13 PM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spri=
ng@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3k=
DJQnV$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rajesh,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This has already been replied l=
ess than one week ago... Please see:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://urldefense.c=
om/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJj=
lg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9J=
w7HGIr9o9$">https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecX=
FxqJjlg_c</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES"><a href=3D"https://urldefense.com/=
v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfa=
k__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P=
8QaU_7$"><span lang=3D"EN-US">https://mailarchive.ietf.org/arch/msg/spring/=
WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><span lang=3D"EN-US"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span lang=3D"ES" st=
yle=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Friday, 11 October 2019 at 03:47<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc: </b>Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;, Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject: </b>[spring] <a href=3D"https://urldefense.com/v3/__https:/tool=
s.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!=
8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQn=
V$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES"><o:p>=
&nbsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">Wanted to know the use =
case where we only POP the SRH ?<o:p></o:p></span></pre>
<h4 style=3D"margin-left:36.0pt"><span lang=3D"ES"><a href=3D"https://urlde=
fense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-pr=
ogramming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7J=
IhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$">4.16.1</a></span><a name=3D"section-4.=
16...1"></a><span lang=3D"ES" style=3D"font-family:&quot;Courier New&quot;"=
>..&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><span lang=3D"ES"><o:p></o:p=
></span></h4>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; The SRH pr=
ocessing of the End, End.X and End.T behaviors are<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; modified: =
after the instruction &quot;S14.&nbsp; Update IPv6 DA with Segment<o:p></o:=
p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; List[Segme=
nts Left]&quot; is executed, the following instructions must be<o:p></o:p><=
/span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; executed a=
s well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbs=
p;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbs=
p;&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp=
;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:36.0pt;margin-bottom:.=
0001pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
</div>
</body>
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Subject: Re: [spring] [Idr] draft-ietf-spring-segment-routing-policy
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To: Rajesh M <mrajesh@juniper.net>, Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">The =
END (END.X /END.T) with PSP (or USP, even more complicated SID instruction =
such as END with [PSP,USP &amp; USD]) advertised by Nodes are only building=
 block for programming SRv6 based Path in
 Ingress edge SR router, whether it is used along the path is up to operato=
r, in some scenario there are little benefit to enable PSP, so it is so-cal=
led flavor, but, I think It may be useful in some scenario which May occur =
in future.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">If y=
ou Compare END.B6.Encaps with END.B6.Encaps.RED, you will also get some con=
clusion.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers!<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:JA">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language:JA=
"> Rajesh M &lt;mrajesh@juniper.net&gt;
<br>
<b>Sent:</b> 2019</span><span lang=3D"JA" style=3D"font-family:&quot;MS PGo=
thic&quot;,sans-serif;mso-fareast-language:JA">=C4=EA</span><span lang=3D"E=
N-US" style=3D"mso-fareast-language:JA">10</span><span lang=3D"JA" style=3D=
"font-family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA">=D4=
=C2</span><span lang=3D"EN-US" style=3D"mso-fareast-language:JA">19</span><=
span lang=3D"JA" style=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso=
-fareast-language:JA">=C8=D5</span><span lang=3D"EN-US" style=3D"mso-fareas=
t-language:JA">
 10:29<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;weibin.wang@nokia-sbell.com=
&gt;; Rajesh M &lt;mrajesh=3D40juniper.net@dmarc.ietf.org&gt;; Pablo Camari=
llo (pcamaril) &lt;pcamaril@cisco.com&gt;; SPRING WG List &lt;spring@ietf.o=
rg&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;; Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Subject:</b> RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-=
srv6-network-programming-04#page-24<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US">MPLS world PSP will help in avoiding one more lookup at egress for VP=
N cases.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US">I feel
</span><span lang=3D"EN-US">both PSP and USP are not useful in case of SRV6=
.</span><span lang=3D"EN-US" style=3D"mso-fareast-language:EN-US"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.w=
ang@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 6:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarill=
o (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</=
a>&gt;;
 SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&=
gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Hi R=
ajesh:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">The =
answer to your question, I think, had better be provided by Authors of NET-=
PGM, You can also refer to Ron=A1=AFs email previously one or two days befo=
re who give some guess, I think it make sense,
 in addition , also including processing-load mitigation in Last hop (egres=
s PE);
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">Coul=
d you Pls explain the benefit of similar behavior in PHP of MPLS world. &nb=
sp;I think it may be same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:JA">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language:JA=
"> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juniper.net<=
/a>&gt;
<br>
<b>Sent:</b> 2019</span><span lang=3D"JA" style=3D"font-family:&quot;MS PGo=
thic&quot;,sans-serif;mso-fareast-language:JA">=C4=EA</span><span lang=3D"E=
N-US" style=3D"mso-fareast-language:JA">10</span><span lang=3D"JA" style=3D=
"font-family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA">=D4=
=C2</span><span lang=3D"EN-US" style=3D"mso-fareast-language:JA">18</span><=
span lang=3D"JA" style=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso=
-fareast-language:JA">=C8=D5</span><span lang=3D"EN-US" style=3D"mso-fareas=
t-language:JA">
 20:18<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;; Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh=3D40juniper.net@dmarc.ietf.org">mrajesh=3D40juniper.ne=
t@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pcamaril)
 &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;; SPRI=
NG WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;<b=
r>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US">I was more focused towards END.DT4 SID where behavior you mentioned i=
s possible only if we do below optimization in
</span><span lang=3D"EN-US"><a href=3D"https://urldefense.com/v3/__https:/t=
ools.ietf.org/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQ=
hv3Ai4Cky1wjCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$">https://tools.i=
etf.org/html/draft-dawra-bess-srv6-services-02</a>&nbsp;
 section 3.</span><span lang=3D"EN-US" style=3D"mso-fareast-language:EN-US"=
><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;">when the received route is colored with an =
extended color community 'C' and Next-Hop 'N', and the ingress PE has a val=
id SRv6 Policy (C, N) associated with SID list &lt;S1,S2,
 S3&gt;, then the effective SR Policy is &lt;S1, S2, SRv6-Service-SID&gt;.H=
ere if you see <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red">S3 and SRv6-Service-SID both b=
elong to Egress so s3 has been removed.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red">For you my query is removing o=
nly SRH header on PHP router will give what kind of advantage ?<o:p></o:p><=
/span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></=
p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">Thanks<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;">Rajesh<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Wang, Weibin (NSB - CN/Shanghai)<br>
<b>Sent:</b> Friday, October 18, 2019 9:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.iet=
f.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pca=
maril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;=
; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>=
&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt">The =
value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent the =
last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 node=
 copy IPv6 SID corresponding to [SL]=3D0 to
 DA field of IP packet, when enable PSP flavor at same time, the penultimat=
e SRv6 node will check the [SL] value, if it is 0, then pop SRH, these extr=
a action is pseudocode of PSP. This logic has no problem.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt">---------------------=
-----------------<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;A=
rial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;T=
imes New Roman&quot;,serif">WANG Weibin&nbsp;
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot=
;Times New Roman&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bo=
unces@ietf.org</a>&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 2019</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=
=BA=DA&quot;,sans-serif">=C4=EA</span><span lang=3D"EN-US">10</span><span s=
tyle=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=D4=C2=
</span><span lang=3D"EN-US">18</span><span style=3D"font-family:&quot;=CE=
=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=C8=D5</span><span lang=3D"EN-US"> =
6:38<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.=
com">pcamaril@cisco.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:sprin=
g@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">WANG had given below use case :=
 But using existing PSP logic this will not work.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In below at PSP router updated =
SL will be 1 (since END.DT4 is still there) ,so SRH pop won=A1=AFt happen.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbs=
p;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbs=
p;&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">WANG use case:<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white">=A1=B0For example in SRv6-based=
 L3VPN service scenario, The ingress PE within SRv6-enabled domain can util=
ize SR-TE policy to enable TE-path function
 when encapsulating and transiting L3VPN traffic, The Ingress PE push on cu=
stomer packets with SID list representing SR-TE policy plus END.DT4 as last=
 SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be designed to=
 perform in related SRv6 endpoint.
 Imaging the PSP, the penultimate Endpoint can perform PSP, e.g. copy the l=
ast SID (END.DT4) of SRH to destination field of IPv6 header and POP the SR=
H, then forwarding it toward egress PE identified by DA=A1=B1<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:9.5pt;font-f=
amily:Menlo;color:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0cm;margin=
-bottom:.0001pt;text-align:center">
<span lang=3D"EN-US" style=3D"font-size:7.0pt;color:black">Juniper Business=
 Use Only</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco=
..com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 10:13 PM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spri=
ng@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3k=
DJQnV$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rajesh,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This has already been replied l=
ess than one week ago.. Please see:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://urldefense.c=
om/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJj=
lg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9J=
w7HGIr9o9$">https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecX=
FxqJjlg_c</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES"><a href=3D"https://urldefense.com/=
v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfa=
k__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P=
8QaU_7$"><span lang=3D"EN-US">https://mailarchive.ietf.org/arch/msg/spring/=
WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><span lang=3D"EN-US"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span lang=3D"ES" st=
yle=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Friday, 11 October 2019 at 03:47<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc: </b>Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;, Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject: </b>[spring] <a href=3D"https://urldefense.com/v3/__https:/tool=
s.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!=
8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQn=
V$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES"><o:p>=
&nbsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">Wanted to know the use =
case where we only POP the SRH ?<o:p></o:p></span></pre>
<h4 style=3D"margin-left:36.0pt"><span lang=3D"ES"><a href=3D"https://urlde=
fense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-pr=
ogramming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7J=
IhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$">4.16.1</a></span><a name=3D"section-4.=
16..1"></a><span lang=3D"ES" style=3D"font-family:&quot;Courier New&quot;">=
..&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><span lang=3D"ES"><o:p></o:p=
></span></h4>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; The SRH pr=
ocessing of the End, End.X and End.T behaviors are<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; modified: =
after the instruction &quot;S14.&nbsp; Update IPv6 DA with Segment<o:p></o:=
p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; List[Segme=
nts Left]&quot; is executed, the following instructions must be<o:p></o:p><=
/span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; executed a=
s well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbs=
p;&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbs=
p;&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES">&nbsp=
;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"ES"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:36.0pt;margin-bottom:.=
0001pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
</div>
</body>
</html>

--_000_781fa397ca1d4e7faed94f45e382b2fbnokiasbellcom_--


From nobody Sat Oct 19 08:06:54 2019
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To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, SPRING WG List <spring@ietf.org>
References: <19C3F806-B455-4D0A-A56B-9BF5C6A36DE8@cisco.com> <MN2PR05MB6080AF7CB8230A9F403F7C89BE6D0@MN2PR05MB6080.namprd05.prod.outlook.com> <02b54f9299ce4820b83e9344e8a5f049@nokia-sbell.com> <MN2PR05MB60806B43DBD4D38910CBB1E3BE6C0@MN2PR05MB6080.namprd05.prod.outlook.com> <b78d1ef5e02d4c22b2b266fb1338e3f7@nokia-sbell.com> <MN2PR05MB6080204CE8F16BE1FC68E713BE6F0@MN2PR05MB6080.namprd05.prod.outlook.com> <MN2PR05MB6080D4E770AB1ABDEF01D360BE6F0@MN2PR05MB6080.namprd05.prod.outlook.com> <CY4PR11MB1541B9E294AC6946BF749CE3C16F0@CY4PR11MB1541.namprd11.prod.outlook.com>
From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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The fact that T.insert is deployed does not seem particularly relevant  
to the quesiton of whether the working groups (6man and SPRING) will  
approve the draft asking for permission to violate RFC 8200.

I will grant that we have also not decided to deprecate that behavior.  
The groups are still debating.  The authors have appropriately removed  
all of the insert functionality from the base network programming draft.  
  If USP and PSP are coupled to that, then they belong in the draft on  
the insertion behaviors.

Pablo has argued that there is no dependence.  Technically, I have to  
grant it is true.  It still seems that the primary use cases are ones  
which are coupled to the insertion behaviors.

Yours,
Joel

On 10/19/2019 12:22 AM, Ketan Talaulikar (ketant) wrote:
> Hi Rajesh,
> 
> T.insert is definitely not deprecated. Please check 
> https://mailarchive.ietf.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0 
> - I would suggest you go through the archives to get the history/context.
> 
> In fact, it is already deployed â€“ check 
> https://tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-status-02
> 
> Thanks,
> 
> Ketan
> 
> *From:*Rajesh M <mrajesh@juniper.net>
> *Sent:* 19 October 2019 09:34
> *To:* Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org>; Wang, Weibin (NSB 
> - CN/Shanghai) <weibin.wang@nokia-sbell.com>; Pablo Camarillo (pcamaril) 
> <pcamaril@cisco.com>; SPRING WG List <spring@ietf.org>; Peter Psenak 
> (ppsenak) <ppsenak@cisco.com>; Ketan Talaulikar (ketant) <ketant@cisco.com>
> *Cc:* Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde 
> <shraddha@juniper.net>; Ron Bonica <rbonica@juniper.net>
> *Subject:* RE: [spring] 
> https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
> 
> if we use T.Insert Mode for TI-LFA then PSP and USP Flavours are useful.
> 
> T.insert mode is Â deprecated ? if Yes then PSP and USP Flavours also 
> must be deprecated as per me.
> 
> Thanks
> 
> Rajesh
> 
> Juniper Business Use Only
> 
> *From:*Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org 
> <mailto:mrajesh=40juniper.net@dmarc.ietf.org>>
> *Sent:* Saturday, October 19, 2019 7:59 AM
> *To:* Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com 
> <mailto:weibin.wang@nokia-sbell.com>>; Rajesh M <mrajesh@juniper.net 
> <mailto:mrajesh@juniper.net>>; Pablo Camarillo (pcamaril) 
> <pcamaril@cisco.com <mailto:pcamaril@cisco.com>>; SPRING WG List 
> <spring@ietf.org <mailto:spring@ietf.org>>
> *Cc:* Srihari Sangli <ssangli@juniper.net <mailto:ssangli@juniper.net>>; 
> Shraddha Hegde <shraddha@juniper.net <mailto:shraddha@juniper.net>>; Ron 
> Bonica <rbonica@juniper.net <mailto:rbonica@juniper.net>>
> *Subject:* RE: [spring] 
> https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
> 
> MPLS world PSP will help in avoiding one more lookup at egress for VPN 
> cases.
> 
> I feel both PSP and USP are not useful in case of SRV6..
> 
> Juniper Business Use Only
> 
> *From:*Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com 
> <mailto:weibin.wang@nokia-sbell.com>>
> *Sent:* Saturday, October 19, 2019 6:26 AM
> *To:* Rajesh M <mrajesh@juniper.net <mailto:mrajesh@juniper.net>>; 
> Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org 
> <mailto:mrajesh=40juniper.net@dmarc.ietf.org>>; Pablo Camarillo 
> (pcamaril) <pcamaril@cisco.com <mailto:pcamaril@cisco.com>>; SPRING WG 
> List <spring@ietf.org <mailto:spring@ietf.org>>
> *Cc:* Srihari Sangli <ssangli@juniper.net <mailto:ssangli@juniper.net>>; 
> Shraddha Hegde <shraddha@juniper.net <mailto:shraddha@juniper.net>>
> *Subject:* RE: [spring] 
> https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
> 
> Hi Rajesh:
> 
> The answer to your question, I think, had better be provided by Authors 
> of NET-PGM, You can also refer to Ronâ€™s email previously one or two days 
> before who give some guess, I think it make sense, in addition , also 
> including processing-load mitigation in Last hop (egress PE);
> 
> Could you Pls explain the benefit of similar behavior in PHP of MPLS 
> world. Â I think it may be same.
> 
> --------------------------------------
> 
> /Cheers !/
> 
> **
> 
> *WANG Weibin *
> 
> *From:*Rajesh M <mrajesh@juniper.net <mailto:mrajesh@juniper.net>>
> *Sent:* 2019å¹´10æœˆ18æ—¥20:18
> *To:* Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com 
> <mailto:weibin.wang@nokia-sbell.com>>; Rajesh M 
> <mrajesh=40juniper.net@dmarc.ietf.org 
> <mailto:mrajesh=40juniper.net@dmarc.ietf.org>>; Pablo Camarillo 
> (pcamaril) <pcamaril@cisco.com <mailto:pcamaril@cisco.com>>; SPRING WG 
> List <spring@ietf.org <mailto:spring@ietf.org>>
> *Cc:* Srihari Sangli <ssangli@juniper.net <mailto:ssangli@juniper.net>>; 
> Shraddha Hegde <shraddha@juniper.net <mailto:shraddha@juniper.net>>
> *Subject:* RE: [spring] 
> https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24 
> <https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c!Tj1RzlZX05hQXJCRb6NfbDmr4p543xmCTIQUDjQsIjiWMC6mn7vFFP39Imon9Has$>
> 
> I was more focused towards END.DT4 SID where behavior you mentioned is 
> possible only if we do below optimization in 
> https://tools.ietf.org/html/draft-dawra-bess-srv6-services-02 
> <https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1wjCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$> 
> section 3.
> 
> when the received route is colored with an extended color community 'C' 
> and Next-Hop 'N', and the ingress PE has a valid SRv6 Policy (C, N) 
> associated with SID list <S1,S2, S3>, then the effective SR Policy is 
> <S1, S2, SRv6-Service-SID>.Here if you see
> 
> *S3 and SRv6-Service-SID both belong to Egress so s3 has been removed.*
> 
> **
> 
> **
> 
> *For you my query is removing only SRH header on PHP router will give 
> what kind of advantage ?*
> 
> **
> 
> *Thanks*
> 
> *Rajesh*
> 
> Juniper Business Use Only
> 
> *From:*spring <spring-bounces@ietf.org <mailto:spring-bounces@ietf.org>> 
> *On Behalf Of *Wang, Weibin (NSB - CN/Shanghai)
> *Sent:* Friday, October 18, 2019 9:26 AM
> *To:* Rajesh M <mrajesh=40juniper.net@dmarc.ietf.org 
> <mailto:mrajesh=40juniper.net@dmarc.ietf.org>>; Pablo Camarillo 
> (pcamaril) <pcamaril@cisco.com <mailto:pcamaril@cisco.com>>; SPRING WG 
> List <spring@ietf.org <mailto:spring@ietf.org>>
> *Cc:* Srihari Sangli <ssangli@juniper.net <mailto:ssangli@juniper.net>>; 
> Shraddha Hegde <shraddha@juniper.net <mailto:shraddha@juniper.net>>
> *Subject:* Re: [spring] 
> https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24 
> <https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>
> 
> The value of Segment Left field in SRH begin with 0, so [SL]=0 represent 
> the last SID. in this case, when [SL] decrease 1, and the penultimate 
> SRv6 node copy IPv6 SID corresponding to [SL]=0 to DA field of IP 
> packet, when enable PSP flavor at same time, the penultimate SRv6 node 
> will check the [SL] value, if it is 0, then pop SRH, these extra action 
> is pseudocode of PSP. This logic has no problem.
> 
> --------------------------------------
> 
> /Cheers !/
> 
> **
> 
> *WANG Weibin *
> 
> *From:*spring <spring-bounces@ietf.org <mailto:spring-bounces@ietf.org>> 
> *On Behalf Of *Rajesh M
> *Sent:* 2019å¹´10æœˆ18æ—¥6:38
> *To:* Pablo Camarillo (pcamaril) <pcamaril@cisco.com 
> <mailto:pcamaril@cisco.com>>; SPRING WG List <spring@ietf.org 
> <mailto:spring@ietf.org>>
> *Cc:* Srihari Sangli <ssangli@juniper.net <mailto:ssangli@juniper.net>>; 
> Shraddha Hegde <shraddha@juniper.net <mailto:shraddha@juniper.net>>
> *Subject:* Re: [spring] 
> https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24 
> <https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>
> 
> WANG had given below use case : But using existing PSP logic this will 
> not work.
> 
> In below at PSP router updated SL will be 1 (since END.DT4 is still 
> there) ,so SRH pop wonâ€™t happen.
> 
>  Â Â  S14.1.Â Â  If (updated SL == 0) {
> 
>  Â Â  S14.2.Â Â Â Â Â  Pop the SRH
> 
>  Â Â  S14.3.Â Â  }
> 
> WANG use case:
> 
> â€œFor example in SRv6-based L3VPN service scenario, The ingress PE within 
> SRv6-enabled domain can utilize SR-TE policy to enable TE-path function 
> when encapsulating and transiting L3VPN traffic, The Ingress PE push on 
> customer packets with SID list representing SR-TE policy plus END.DT4 as 
> last SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be 
> designed to perform in related SRv6 endpoint. Imaging the PSP, the 
> penultimate Endpoint can perform PSP, e.g. copy the last SID (END.DT4) 
> of SRH to destination field of IPv6 header and POP the SRH, then 
> forwarding it toward egress PE identified by DAâ€
> 
> Juniper Business Use Only
> 
> *From:*Pablo Camarillo (pcamaril) <pcamaril@cisco.com 
> <mailto:pcamaril@cisco...com>>
> *Sent:* Tuesday, October 15, 2019 10:13 PM
> *To:* Rajesh M <mrajesh@juniper.net <mailto:mrajesh@juniper.net>>; 
> SPRING WG List <spring@ietf.org <mailto:spring@ietf.org>>
> *Cc:* Srihari Sangli <ssangli@juniper.net <mailto:ssangli@juniper.net>>; 
> Shraddha Hegde <shraddha@juniper.net <mailto:shraddha@juniper.net>>
> *Subject:* Re: [spring] 
> https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24 
> <https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>
> 
> Rajesh,
> 
> This has already been replied less than one week ago... Please see:
> 
> https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c 
> <https://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7HGIr9o9$>
> 
> https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak 
> <https://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P8QaU_7$>
> 
> Thanks,
> 
> Pablo.
> 
> *From: *spring <spring-bounces@ietf.org 
> <mailto:spring-bounces@ietf.org>> on behalf of Rajesh M 
> <mrajesh=40juniper.net@dmarc.ietf.org 
> <mailto:mrajesh=40juniper.net@dmarc.ietf.org>>
> *Date: *Friday, 11 October 2019 at 03:47
> *To: *SPRING WG List <spring@ietf.org <mailto:spring@ietf.org>>
> *Cc: *Srihari Sangli <ssangli@juniper.net <mailto:ssangli@juniper.net>>, 
> Shraddha Hegde <shraddha@juniper.net <mailto:shraddha@juniper.net>>
> *Subject: *[spring] 
> https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24 
> <https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>
> 
> Wanted to know the use case where we only POP the SRH ?
> 
> 
>         4.16.1
>         <https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$>..
>         PSP: Penultimate Segment Pop of the SRH
> 
>  Â Â  The SRH processing of the End, End.X and End.T behaviors are
> 
>  Â Â  modified: after the instruction "S14.Â  Update IPv6 DA with Segment
> 
>  Â Â  List[Segments Left]" is executed, the following instructions must be
> 
>  Â Â  executed as well:
> 
>  Â Â  S14.1.Â Â  If (updated SL == 0) {
> 
>  Â Â  S14.2.Â Â Â Â Â  Pop the SRH
> 
>  Â Â  S14.3.Â Â  }
> 
> Juniper Business Use Only
> 
> 
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
> 


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From: li zhenqiang <li_zhenqiang@hotmail.com>
To: "Dongjie (Jimmy)" <jie.dong@huawei.com>, "spring@ietf.org" <spring@ietf.org>
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Thread-Topic: [spring] Request for WG adoption of draft-dong-spring-sr-for-enhanced-vpn-05
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/erV8AnnJCSsafT_GowqKUP6HR-M>
Subject: Re: [spring] Request for WG adoption of draft-dong-spring-sr-for-enhanced-vpn-05
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--_000_HK0PR03MB4066036414C12DC3FA3BF642FC690HK0PR03MB4066apcp_
Content-Type: text/plain; charset="iso-8859-1"
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Hello all and chairs,

I support the adoption poll as a co-author. I believe the doc is mature eno=
ugh to be a wg item.

Best Regards,
Zhenqiang Li
________________________________
li_zhenqiang@hotmail.com

From: Dongjie (Jimmy)<mailto:jie.dong@huawei.com>
Date: 2019-10-21 13:21
To: 'SPRING WG List'<mailto:spring@ietf.org>
CC: spring-chairs@ietf.org<mailto:spring-chairs@ietf.org>
Subject: [spring] Request for WG adoption of draft-dong-spring-sr-for-enhan=
ced-vpn-05
Dear WG and Chairs,

A new revision of draft-dong-spring-sr-for-enhanced-vpn has been uploaded t=
o resolve some recently received comments. This document describes the Segm=
ent Routing based mechanism to provide enhanced VPN, which aligns with the =
enhanced VPN (VPN)+ framework document in TEAS WG. The mechanism could be u=
sed to enable transport network slicing for 5G.

The major changes compared to the -04 version are:

  1. Update the draft template.

  2. Add reference to the definition of network slicing in 3GPP TS23.501 an=
d the definition of transport network slicing in draft-ietf-teas-enhanced-v=
pn-03 respectively.

  3. Editorial changes in several sections to clarify and improve the reada=
bility.

  4. Change some coauthors' affiliation and mail address.

This update shows that the major content of this draft has become stable an=
d solid, thus the authors would like to request the WG to consider the adop=
tion of this document.

Comments are always welcome. Thanks.

Best regards,
Jie

-----Original Message-----
From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
Sent: Wednesday, October 16, 2019 3:28 PM
To: Takuya Miyasaka <ta-miyasaka@kddi.com>; Zhenqiang Li <li_zhenqiang@hotm=
ail.com>; Fengwei Qin <qinfengwei@chinamobile.com>; Stewart Bryant <stewart=
.bryant@gmail.com>; Yongqing Zhu <zhuyq.gd@chinatelecom.cn>; Dongjie (Jimmy=
) <jie.dong@huawei.com>
Subject: New Version Notification for draft-dong-spring-sr-for-enhanced-vpn=
-05.txt


A new version of I-D, draft-dong-spring-sr-for-enhanced-vpn-05.txt
has been successfully submitted by Jie Dong and posted to the IETF reposito=
ry.

Name: draft-dong-spring-sr-for-enhanced-vpn
Revision: 05
Title: Segment Routing for Enhanced VPN Service
Document date: 2019-10-16
Group: Individual Submission
Pages: 20
URL:            https://www.ietf.org/internet-drafts/draft-dong-spring-sr-f=
or-enhanced-vpn-05.txt
Status:         https://datatracker.ietf.org/doc/draft-dong-spring-sr-for-e=
nhanced-vpn/
Htmlized:       https://tools.ietf.org/html/draft-dong-spring-sr-for-enhanc=
ed-vpn-05
Htmlized:       https://datatracker.ietf.org/doc/html/draft-dong-spring-sr-=
for-enhanced-vpn
Diff:           https://www.ietf.org/rfcdiff?url2=3Ddraft-dong-spring-sr-fo=
r-enhanced-vpn-05

Abstract:
   Enhanced VPN (VPN+) is an enhancement to VPN services to enable it to
   support the needs of new applications, particularly applications that
   are associated with 5G services.  These applications require better
   isolation from both control and data plane's perspective and have
   more stringent performance requirements than can be provided with
   overlay VPNs.  The characteristics of an enhanced VPN as perceived by
   its tenant needs to be comparable to those of a dedicated private
   network.  This requires tight integration between the overlay VPN and
   the underlay network topology and resources in a scalable manner.  An
   enhanced VPN may form the underpinning of 5G network slicing, but
   will also be of use in its own right.  This document describes how to
   use segment routing based mechanisms to provide the enhanced VPN
   service with the required network topology and resources.  The
   overall mechanism of providing segment routing based enhanced VPN
   service is also described.  The proposed mechanism is applicable to
   both segment routing with MPLS data plane (SR-MPLS) and segment
   routing with IPv6 data plane (SRv6).





Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat

_______________________________________________
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--_000_HK0PR03MB4066036414C12DC3FA3BF642FC690HK0PR03MB4066apcp_
Content-Type: text/html; charset="iso-8859-1"
Content-ID: <BEBAFD2DC2BC2F428F60F8F3A0A8A27E@apcprd03.prod.outlook.com>
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style>body { line-height: 1.5; }blockquote { margin-top: 0px; margin-botto=
m: 0px; margin-left: 0.5em; }body { font-size: 10.5pt; font-family: ????; c=
olor: rgb(0, 0, 0); line-height: 1.5; }</style>
</head>
<body>
<div>Hello all and chairs,</div>
<div><br>
</div>
<div><span></span>I support the adoption poll as a co-author. I believe the=
 doc is mature enough to be a wg item.&nbsp;</div>
<div><br>
</div>
<div>Best Regards,</div>
<div>Zhenqiang Li</div>
<hr style=3D"width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" align=
=3D"left">
<div><span>
<div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt">
<div>li_zhenqiang@hotmail.com</div>
</div>
</span></div>
<blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px; margin-Left: 0.5e=
m">
<div>&nbsp;</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-F=
AMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDI=
NG-TOP: 8px">
<div><b>From:</b>&nbsp;<a href=3D"mailto:jie.dong@huawei.com">Dongjie (Jimm=
y)</a></div>
<div><b>Date:</b>&nbsp;2019-10-21&nbsp;13:21</div>
<div><b>To:</b>&nbsp;<a href=3D"mailto:spring@ietf.org">'SPRING WG List'</a=
></div>
<div><b>CC:</b>&nbsp;<a href=3D"mailto:spring-chairs@ietf.org">spring-chair=
s@ietf.org</a></div>
<div><b>Subject:</b>&nbsp;[spring] Request for WG adoption of draft-dong-sp=
ring-sr-for-enhanced-vpn-05</div>
</div>
</div>
<div>
<div>Dear WG and Chairs, </div>
<div>&nbsp;</div>
<div>A new revision of draft-dong-spring-sr-for-enhanced-vpn has been uploa=
ded to resolve some recently received comments. This document describes the=
 Segment Routing based mechanism to provide enhanced VPN, which aligns with=
 the enhanced VPN (VPN)&#43; framework
 document in TEAS WG. The mechanism could be used to enable transport netwo=
rk slicing for 5G.</div>
<div>&nbsp;</div>
<div>The major changes compared to the -04 version are:</div>
<div>&nbsp;</div>
<div>&nbsp; 1. Update the draft template. </div>
<div>&nbsp;</div>
<div>&nbsp; 2. Add reference to the definition of network slicing in 3GPP T=
S23.501 and the definition of transport network slicing in draft-ietf-teas-=
enhanced-vpn-03 respectively.</div>
<div>&nbsp;</div>
<div>&nbsp; 3. Editorial changes in several sections to clarify and improve=
 the readability.</div>
<div>&nbsp;</div>
<div>&nbsp; 4. Change some coauthors' affiliation and mail address.</div>
<div>&nbsp;</div>
<div>This update shows that the major content of this draft has become stab=
le and solid, thus the authors would like to request the WG to consider the=
 adoption of this document.
</div>
<div>&nbsp;</div>
<div>Comments are always welcome. Thanks.</div>
<div>&nbsp;</div>
<div>Best regards,</div>
<div>Jie</div>
<div>&nbsp;</div>
<div>-----Original Message-----</div>
<div>From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org] </div=
>
<div>Sent: Wednesday, October 16, 2019 3:28 PM</div>
<div>To: Takuya Miyasaka &lt;ta-miyasaka@kddi.com&gt;; Zhenqiang Li &lt;li_=
zhenqiang@hotmail.com&gt;; Fengwei Qin &lt;qinfengwei@chinamobile.com&gt;; =
Stewart Bryant &lt;stewart.bryant@gmail.com&gt;; Yongqing Zhu &lt;zhuyq.gd@=
chinatelecom.cn&gt;; Dongjie (Jimmy) &lt;jie.dong@huawei.com&gt;</div>
<div>Subject: New Version Notification for draft-dong-spring-sr-for-enhance=
d-vpn-05.txt</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>A new version of I-D, draft-dong-spring-sr-for-enhanced-vpn-05.txt</di=
v>
<div>has been successfully submitted by Jie Dong and posted to the IETF rep=
ository.</div>
<div>&nbsp;</div>
<div>Name: draft-dong-spring-sr-for-enhanced-vpn</div>
<div>Revision: 05</div>
<div>Title: Segment Routing for Enhanced VPN Service</div>
<div>Document date: 2019-10-16</div>
<div>Group: Individual Submission</div>
<div>Pages: 20</div>
<div>URL:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 https://www.ietf.org/internet-drafts/draft-dong-spring-sr-for-enhanced-vpn=
-05.txt</div>
<div>Status:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; https://datatr=
acker.ietf.org/doc/draft-dong-spring-sr-for-enhanced-vpn/</div>
<div>Htmlized:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; https://tools.ietf.org/h=
tml/draft-dong-spring-sr-for-enhanced-vpn-05</div>
<div>Htmlized:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; https://datatracker.ietf=
.org/doc/html/draft-dong-spring-sr-for-enhanced-vpn</div>
<div>Diff:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http=
s://www.ietf.org/rfcdiff?url2=3Ddraft-dong-spring-sr-for-enhanced-vpn-05</d=
iv>
<div>&nbsp;</div>
<div>Abstract:</div>
<div>&nbsp;&nbsp; Enhanced VPN (VPN&#43;) is an enhancement to VPN services=
 to enable it to</div>
<div>&nbsp;&nbsp; support the needs of new applications, particularly appli=
cations that</div>
<div>&nbsp;&nbsp; are associated with 5G services.&nbsp; These applications=
 require better</div>
<div>&nbsp;&nbsp; isolation from both control and data plane's perspective =
and have</div>
<div>&nbsp;&nbsp; more stringent performance requirements than can be provi=
ded with</div>
<div>&nbsp;&nbsp; overlay VPNs.&nbsp; The characteristics of an enhanced VP=
N as perceived by</div>
<div>&nbsp;&nbsp; its tenant needs to be comparable to those of a dedicated=
 private</div>
<div>&nbsp;&nbsp; network.&nbsp; This requires tight integration between th=
e overlay VPN and</div>
<div>&nbsp;&nbsp; the underlay network topology and resources in a scalable=
 manner.&nbsp; An</div>
<div>&nbsp;&nbsp; enhanced VPN may form the underpinning of 5G network slic=
ing, but</div>
<div>&nbsp;&nbsp; will also be of use in its own right.&nbsp; This document=
 describes how to</div>
<div>&nbsp;&nbsp; use segment routing based mechanisms to provide the enhan=
ced VPN</div>
<div>&nbsp;&nbsp; service with the required network topology and resources.=
&nbsp; The</div>
<div>&nbsp;&nbsp; overall mechanism of providing segment routing based enha=
nced VPN</div>
<div>&nbsp;&nbsp; service is also described.&nbsp; The proposed mechanism i=
s applicable to</div>
<div>&nbsp;&nbsp; both segment routing with MPLS data plane (SR-MPLS) and s=
egment</div>
<div>&nbsp;&nbsp; routing with IPv6 data plane (SRv6).</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>Please note that it may take a couple of minutes from the time of subm=
ission until the htmlized version and diff are available at tools.ietf.org.=
</div>
<div>&nbsp;</div>
<div>The IETF Secretariat</div>
<div>&nbsp;</div>
<div>_______________________________________________</div>
<div>spring mailing list</div>
<div>spring@ietf.org</div>
<div>https://www.ietf.org/mailman/listinfo/spring</div>
</div>
</blockquote>
</body>
</html>

--_000_HK0PR03MB4066036414C12DC3FA3BF642FC690HK0PR03MB4066apcp_--


From nobody Mon Oct 21 03:33:35 2019
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To: "spring@ietf.org" <spring@ietf.org>
Cc: li zhenqiang <li_zhenqiang@hotmail.com>, "Dongjie (Jimmy)" <jie.dong@huawei.com>, "spring-chairs@ietf.org" <spring-chairs@ietf.org>
References: <76CD132C3ADEF848BD84D028D243C927CD29D6D7@NKGEML515-MBX.china.huawei.com> <HK0PR03MB4066036414C12DC3FA3BF642FC690@HK0PR03MB4066.apcprd03.prod.outlook.com>
From: Loa Andersson <loa@pi.nu>
Message-ID: <5d7d925e-fffa-9f3b-bc3f-b9e509f4bbfb@pi.nu>
Date: Mon, 21 Oct 2019 12:33:27 +0200
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Subject: Re: [spring] Request for WG adoption of draft-dong-spring-sr-for-enhanced-vpn-05
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WG,

I reviewed this document before the last version, my comments have been
addressed and I think this is ready for adoption as a working grouo
document.

/Loa

On 2019-10-21 12:16, li zhenqiang wrote:
> Hello all and chairs,
> 
> I support the adoption poll as a co-author. I believe the doc is mature 
> enough to be a wg item.
> 
> Best Regards,
> Zhenqiang Li
> ------------------------------------------------------------------------
> li_zhenqiang@hotmail.com
> 
>     *From:* Dongjie (Jimmy) <mailto:jie.dong@huawei.com>
>     *Date:* 2019-10-21 13:21
>     *To:* 'SPRING WG List' <mailto:spring@ietf.org>
>     *CC:* spring-chairs@ietf.org <mailto:spring-chairs@ietf.org>
>     *Subject:* [spring] Request for WG adoption of
>     draft-dong-spring-sr-for-enhanced-vpn-05
>     Dear WG and Chairs,
>     A new revision of draft-dong-spring-sr-for-enhanced-vpn has been
>     uploaded to resolve some recently received comments. This document
>     describes the Segment Routing based mechanism to provide enhanced
>     VPN, which aligns with the enhanced VPN (VPN)+ framework document in
>     TEAS WG. The mechanism could be used to enable transport network
>     slicing for 5G.
>     The major changes compared to the -04 version are:
>        1. Update the draft template.
>        2. Add reference to the definition of network slicing in 3GPP
>     TS23.501 and the definition of transport network slicing in
>     draft-ietf-teas-enhanced-vpn-03 respectively.
>        3. Editorial changes in several sections to clarify and improve
>     the readability.
>        4. Change some coauthors' affiliation and mail address.
>     This update shows that the major content of this draft has become
>     stable and solid, thus the authors would like to request the WG to
>     consider the adoption of this document.
>     Comments are always welcome. Thanks.
>     Best regards,
>     Jie
>     -----Original Message-----
>     From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
>     Sent: Wednesday, October 16, 2019 3:28 PM
>     To: Takuya Miyasaka <ta-miyasaka@kddi.com>; Zhenqiang Li
>     <li_zhenqiang@hotmail.com>; Fengwei Qin
>     <qinfengwei@chinamobile.com>; Stewart Bryant
>     <stewart.bryant@gmail.com>; Yongqing Zhu <zhuyq.gd@chinatelecom.cn>;
>     Dongjie (Jimmy) <jie.dong@huawei.com>
>     Subject: New Version Notification for
>     draft-dong-spring-sr-for-enhanced-vpn-05.txt
>     A new version of I-D, draft-dong-spring-sr-for-enhanced-vpn-05.txt
>     has been successfully submitted by Jie Dong and posted to the IETF
>     repository.
>     Name: draft-dong-spring-sr-for-enhanced-vpn
>     Revision: 05
>     Title: Segment Routing for Enhanced VPN Service
>     Document date: 2019-10-16
>     Group: Individual Submission
>     Pages: 20
>     URL:           
>     https://www.ietf.org/internet-drafts/draft-dong-spring-sr-for-enhanced-vpn-05.txt
>     Status:        
>     https://datatracker.ietf.org/doc/draft-dong-spring-sr-for-enhanced-vpn/
>     Htmlized:      
>     https://tools.ietf.org/html/draft-dong-spring-sr-for-enhanced-vpn-05
>     Htmlized:      
>     https://datatracker.ietf..org/doc/html/draft-dong-spring-sr-for-enhanced-vpn
>     Diff:          
>     https://www.ietf.org/rfcdiff?url2=draft-dong-spring-sr-for-enhanced-vpn-05
>     Abstract:
>         Enhanced VPN (VPN+) is an enhancement to VPN services to enable
>     it to
>         support the needs of new applications, particularly applications
>     that
>         are associated with 5G services.  These applications require better
>         isolation from both control and data plane's perspective and have
>         more stringent performance requirements than can be provided with
>         overlay VPNs.  The characteristics of an enhanced VPN as
>     perceived by
>         its tenant needs to be comparable to those of a dedicated private
>         network.  This requires tight integration between the overlay
>     VPN and
>         the underlay network topology and resources in a scalable
>     manner.  An
>         enhanced VPN may form the underpinning of 5G network slicing, but
>         will also be of use in its own right.  This document describes
>     how to
>         use segment routing based mechanisms to provide the enhanced VPN
>         service with the required network topology and resources.  The
>         overall mechanism of providing segment routing based enhanced VPN
>         service is also described.  The proposed mechanism is applicable to
>         both segment routing with MPLS data plane (SR-MPLS) and segment
>         routing with IPv6 data plane (SRv6).
>     Please note that it may take a couple of minutes from the time of
>     submission until the htmlized version and diff are available at
>     tools.ietf.org.
>     The IETF Secretariat
>     _______________________________________________
>     spring mailing list
>     spring@ietf.org
>     https://www.ietf.org/mailman/listinfo/spring
> 
> 
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
> 

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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From: "Xiejingrong (Jingrong)" <xiejingrong@huawei.com>
To: "spring@ietf.org" <spring@ietf.org>
CC: "Dongjie (Jimmy)" <jie.dong@huawei.com>, "spring-chairs@ietf.org" <spring-chairs@ietf.org>, li zhenqiang <li_zhenqiang@hotmail.com>, "Loa Andersson" <loa@pi.nu>
Thread-Topic: [spring] Request for WG adoption of draft-dong-spring-sr-for-enhanced-vpn-05
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Subject: Re: [spring] Request for WG adoption of draft-dong-spring-sr-for-enhanced-vpn-05
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I support the adoption of this document.

It is well-written, and I think it is very timely and useful, as the SR bei=
ng widely developed and the requirements for enhanced VPN services being st=
rong.

Thanks
Jingrong

-----Original Message-----
From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Loa Andersson
Sent: Monday, October 21, 2019 6:33 PM
To: spring@ietf.org
Cc: Dongjie (Jimmy) <jie.dong@huawei.com>; spring-chairs@ietf.org; li zhenq=
iang <li_zhenqiang@hotmail.com>
Subject: Re: [spring] Request for WG adoption of draft-dong-spring-sr-for-e=
nhanced-vpn-05

WG,

I reviewed this document before the last version, my comments have been add=
ressed and I think this is ready for adoption as a working grouo document.

/Loa

On 2019-10-21 12:16, li zhenqiang wrote:
> Hello all and chairs,
>=20
> I support the adoption poll as a co-author. I believe the doc is=20
> mature enough to be a wg item.
>=20
> Best Regards,
> Zhenqiang Li
> ----------------------------------------------------------------------
> --
> li_zhenqiang@hotmail.com
>=20
>     *From:* Dongjie (Jimmy) <mailto:jie.dong@huawei.com>
>     *Date:*=A02019-10-21=A013:21
>     *To:* 'SPRING WG List' <mailto:spring@ietf.org>
>     *CC:* spring-chairs@ietf.org <mailto:spring-chairs@ietf.org>
>     *Subject:*=A0[spring] Request for WG adoption of
>     draft-dong-spring-sr-for-enhanced-vpn-05
>     Dear WG and Chairs,
>     A new revision of draft-dong-spring-sr-for-enhanced-vpn has been
>     uploaded to resolve some recently received comments. This document
>     describes the Segment Routing based mechanism to provide enhanced
>     VPN, which aligns with the enhanced VPN (VPN)+ framework document in
>     TEAS WG. The mechanism could be used to enable transport network
>     slicing for 5G.
>     The major changes compared to the -04 version are:
>      =A0 1. Update the draft template.
>      =A0 2. Add reference to the definition of network slicing in 3GPP
>     TS23.501 and the definition of transport network slicing in
>     draft-ietf-teas-enhanced-vpn-03 respectively.
>      =A0 3. Editorial changes in several sections to clarify and improve
>     the readability.
>      =A0 4. Change some coauthors' affiliation and mail address.
>     This update shows that the major content of this draft has become
>     stable and solid, thus the authors would like to request the WG to
>     consider the adoption of this document.
>     Comments are always welcome. Thanks.
>     Best regards,
>     Jie
>     -----Original Message-----
>     From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
>     Sent: Wednesday, October 16, 2019 3:28 PM
>     To: Takuya Miyasaka <ta-miyasaka@kddi.com>; Zhenqiang Li
>     <li_zhenqiang@hotmail.com>; Fengwei Qin
>     <qinfengwei@chinamobile.com>; Stewart Bryant
>     <stewart.bryant@gmail.com>; Yongqing Zhu <zhuyq.gd@chinatelecom.cn>;
>     Dongjie (Jimmy) <jie.dong@huawei.com>
>     Subject: New Version Notification for
>     draft-dong-spring-sr-for-enhanced-vpn-05.txt
>     A new version of I-D, draft-dong-spring-sr-for-enhanced-vpn-05.txt
>     has been successfully submitted by Jie Dong and posted to the IETF
>     repository.
>     Name: draft-dong-spring-sr-for-enhanced-vpn
>     Revision: 05
>     Title: Segment Routing for Enhanced VPN Service
>     Document date: 2019-10-16
>     Group: Individual Submission
>     Pages: 20
>     URL:          =20
>     https://www.ietf.org/internet-drafts/draft-dong-spring-sr-for-enhance=
d-vpn-05.txt
>     Status:       =20
>     https://datatracker.ietf.org/doc/draft-dong-spring-sr-for-enhanced-vp=
n/
>     Htmlized:     =20
>     https://tools.ietf.org/html/draft-dong-spring-sr-for-enhanced-vpn-05
>     Htmlized:     =20
>     https://datatracker.ietf..org/doc/html/draft-dong-spring-sr-for-enhan=
ced-vpn
>     Diff:         =20
>     https://www.ietf.org/rfcdiff?url2=3Ddraft-dong-spring-sr-for-enhanced=
-vpn-05
>     Abstract:
>      =A0=A0 Enhanced VPN (VPN+) is an enhancement to VPN services to enab=
le
>     it to
>      =A0=A0 support the needs of new applications, particularly applicati=
ons
>     that
>      =A0=A0 are associated with 5G services.=A0 These applications requir=
e better
>      =A0=A0 isolation from both control and data plane's perspective and =
have
>      =A0=A0 more stringent performance requirements than can be provided =
with
>      =A0=A0 overlay VPNs.=A0 The characteristics of an enhanced VPN as
>     perceived by
>      =A0=A0 its tenant needs to be comparable to those of a dedicated pri=
vate
>      =A0=A0 network.=A0 This requires tight integration between the overl=
ay
>     VPN and
>      =A0=A0 the underlay network topology and resources in a scalable
>     manner.=A0 An
>      =A0=A0 enhanced VPN may form the underpinning of 5G network slicing,=
 but
>      =A0=A0 will also be of use in its own right.=A0 This document descri=
bes
>     how to
>      =A0=A0 use segment routing based mechanisms to provide the enhanced =
VPN
>      =A0=A0 service with the required network topology and resources.=A0 =
The
>      =A0=A0 overall mechanism of providing segment routing based enhanced=
 VPN
>      =A0=A0 service is also described.=A0 The proposed mechanism is appli=
cable to
>      =A0=A0 both segment routing with MPLS data plane (SR-MPLS) and segme=
nt
>      =A0=A0 routing with IPv6 data plane (SRv6).
>     Please note that it may take a couple of minutes from the time of
>     submission until the htmlized version and diff are available at
>     tools.ietf.org.
>     The IETF Secretariat
>     _______________________________________________
>     spring mailing list
>     spring@ietf.org
>     https://www.ietf.org/mailman/listinfo/spring
>=20
>=20
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>=20

--=20


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64

_______________________________________________
spring mailing list
spring@ietf.org
https://www.ietf.org/mailman/listinfo/spring


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WG,
I support the adoption poll as a co-author.
I have reviewed this doc, my comments have been addressed and I think it =
is
mature enough to be a working group doc.



Thanks,
Fengwei Qin

-----=D3=CA=BC=FE=D4=AD=BC=FE-----
=B7=A2=BC=FE=C8=CB: spring [mailto:spring-bounces@ietf.org] =B4=FA=B1=ED =
Dongjie (Jimmy)
=B7=A2=CB=CD=CA=B1=BC=E4: 2019=C4=EA10=D4=C221=C8=D5 13:22
=CA=D5=BC=FE=C8=CB: 'SPRING WG List'
=B3=AD=CB=CD: spring-chairs@ietf.org
=D6=F7=CC=E2: [spring] Request for WG adoption of
draft-dong-spring-sr-for-enhanced-vpn-05

Dear WG and Chairs,=20

A new revision of draft-dong-spring-sr-for-enhanced-vpn has been =
uploaded to
resolve some recently received comments. This document describes the =
Segment
Routing based mechanism to provide enhanced VPN, which aligns with the
enhanced VPN (VPN)+ framework document in TEAS WG. The mechanism could =
be
used to enable transport network slicing for 5G.

The major changes compared to the -04 version are:

  1. Update the draft template.=20

  2. Add reference to the definition of network slicing in 3GPP TS23.501 =
and
the definition of transport network slicing in
draft-ietf-teas-enhanced-vpn-03 respectively.

  3. Editorial changes in several sections to clarify and improve the
readability.

  4. Change some coauthors' affiliation and mail address.

This update shows that the major content of this draft has become stable =
and
solid, thus the authors would like to request the WG to consider the
adoption of this document.=20

Comments are always welcome. Thanks.

Best regards,
Jie

-----Original Message-----
From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]=20
Sent: Wednesday, October 16, 2019 3:28 PM
To: Takuya Miyasaka <ta-miyasaka@kddi.com>; Zhenqiang Li
<li_zhenqiang@hotmail.com>; Fengwei Qin <qinfengwei@chinamobile.com>;
Stewart Bryant <stewart.bryant@gmail.com>; Yongqing Zhu
<zhuyq.gd@chinatelecom.cn>; Dongjie (Jimmy) <jie.dong@huawei.com>
Subject: New Version Notification for
draft-dong-spring-sr-for-enhanced-vpn-05.txt


A new version of I-D, draft-dong-spring-sr-for-enhanced-vpn-05.txt
has been successfully submitted by Jie Dong and posted to the IETF
repository.

Name:		draft-dong-spring-sr-for-enhanced-vpn
Revision:	05
Title:		Segment Routing for Enhanced VPN Service
Document date:	2019-10-16
Group:		Individual Submission
Pages:		20
URL:
https://www.ietf.org/internet-drafts/draft-dong-spring-sr-for-enhanced-vp=
n-0
5.txt
Status:
https://datatracker.ietf.org/doc/draft-dong-spring-sr-for-enhanced-vpn/
Htmlized:
https://tools.ietf.org/html/draft-dong-spring-sr-for-enhanced-vpn-05
Htmlized:
https://datatracker.ietf.org/doc/html/draft-dong-spring-sr-for-enhanced-v=
pn
Diff:
https://www.ietf.org/rfcdiff?url2=3Ddraft-dong-spring-sr-for-enhanced-vpn=
-05

Abstract:
   Enhanced VPN (VPN+) is an enhancement to VPN services to enable it to
   support the needs of new applications, particularly applications that
   are associated with 5G services.  These applications require better
   isolation from both control and data plane's perspective and have
   more stringent performance requirements than can be provided with
   overlay VPNs.  The characteristics of an enhanced VPN as perceived by
   its tenant needs to be comparable to those of a dedicated private
   network.  This requires tight integration between the overlay VPN and
   the underlay network topology and resources in a scalable manner.  An
   enhanced VPN may form the underpinning of 5G network slicing, but
   will also be of use in its own right.  This document describes how to
   use segment routing based mechanisms to provide the enhanced VPN
   service with the required network topology and resources.  The
   overall mechanism of providing segment routing based enhanced VPN
   service is also described.  The proposed mechanism is applicable to
   both segment routing with MPLS data plane (SR-MPLS) and segment
   routing with IPv6 data plane (SRv6).


=20



Please note that it may take a couple of minutes from the time of =
submission
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat

_______________________________________________
spring mailing list
spring@ietf.org
https://www.ietf.org/mailman/listinfo/spring




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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/4pikRli_HSECun9AbwfpmOF5KLI>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#page-24
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Ketan,

Previously in this thread, we have agreed on the following:


  *   PSP and USP operate upon SRH with SL equal to zero
  *   SRH with SL equal to zero is a functional NOOP

Because SRH with SL equal to zero is a functional  NOOP, there is limited v=
alue is  special operations that removes it.

Currently, there is an unresolved issue regarding whether a transit node ca=
n insert or remove extension headers in flight. As a result of that argumen=
t, END.B6.INSERT and T.INSERT have been moved to a separate document. You m=
ight want to move PSP and USP to that same document for the following reaso=
ns:


  *   Moving PSP and USP will allow the network programming draft to progre=
ss before the larger issue of extension header insertion and removal is res=
olved
  *   Moving PSP and USP will prevent the network programming draft from be=
ing delayed over a functional NOOP.


                                                                           =
 Ron




Juniper Business Use Only
From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: Saturday, October 19, 2019 12:22 AM
To: Rajesh M <mrajesh@juniper.net>; Rajesh M <mrajesh=3D40juniper.net@dmarc=
.ietf.org>; Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>;=
 Pablo Camarillo (pcamaril) <pcamaril@cisco.com>; SPRING WG List <spring@ie=
tf.org>; Peter Psenak (ppsenak) <ppsenak@cisco.com>
Cc: Srihari Sangli <ssangli@juniper.net>; Shraddha Hegde <shraddha@juniper.=
net>; Ron Bonica <rbonica@juniper.net>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24

Hi Rajesh,

T.insert is definitely not deprecated. Please check https://mailarchive.iet=
f.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0<https://urldefense.com/v3=
/__https:/mailarchive.ietf.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0_=
_;!8WoA6RjC81c!WtxAEiukUUeEilxoIdc4jE3cAwZIAZ2aUNEwerDNWiOwERTh5iYkF1fepfb-=
GGcH$> - I would suggest you go through the archives to get the history/con=
text.

In fact, it is already deployed - check https://tools.ietf.org/html/draft-m=
atsushima-spring-srv6-deployment-status-02<https://urldefense.com/v3/__http=
s:/tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-status-02__;=
!8WoA6RjC81c!WtxAEiukUUeEilxoIdc4jE3cAwZIAZ2aUNEwerDNWiOwERTh5iYkF1fepXkLxy=
f0$>

Thanks,
Ketan

From: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>
Sent: 19 October 2019 09:34
To: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40jun=
iper.net@dmarc.ietf.org>>; Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@no=
kia-sbell.com<mailto:weibin.wang@nokia-sbell.com>>; Pablo Camarillo (pcamar=
il) <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>; SPRING WG List <spring=
@ietf.org<mailto:spring@ietf.org>>; Peter Psenak (ppsenak) <ppsenak@cisco.c=
om<mailto:ppsenak@cisco.com>>; Ketan Talaulikar (ketant) <ketant@cisco.com<=
mailto:ketant@cisco.com>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>; Ron Bonica <=
rbonica@juniper.net<mailto:rbonica@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24


if we use T.Insert Mode for TI-LFA then PSP and USP Flavours are useful.



T.insert mode is  deprecated ? if Yes then PSP and USP Flavours also must b=
e deprecated as per me.



Thanks

Rajesh







Juniper Business Use Only
From: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40j=
uniper.net@dmarc.ietf.org>>
Sent: Saturday, October 19, 2019 7:59 AM
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:we=
ibin.wang@nokia-sbell.com>>; Rajesh M <mrajesh@juniper.net<mailto:mrajesh@j=
uniper.net>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamari=
l@cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>; Ron Bonica <=
rbonica@juniper.net<mailto:rbonica@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!WtxAEiukUUeEilxoIdc4jE3cAwZIAZ2aUNEwerDNWiOwERTh5iYkF1fepQnzb6U7$>

MPLS world PSP will help in avoiding one more lookup at egress for VPN case=
s.

I feel both PSP and USP are not useful in case of SRV6.



Juniper Business Use Only
From: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:=
weibin.wang@nokia-sbell.com>>
Sent: Saturday, October 19, 2019 6:26 AM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; Rajesh M <m=
rajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40juniper.net@dmarc.=
ietf.org>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@=
cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!WtxAEiukUUeEilxoIdc4jE3cAwZIAZ2aUNEwerDNWiOwERTh5iYkF1fepQnzb6U7$>

Hi Rajesh:
The answer to your question, I think, had better be provided by Authors of =
NET-PGM, You can also refer to Ron=1B$B!G=1B(Bs email previously one or two=
 days before who give some guess, I think it make sense, in addition , also=
 including processing-load mitigation in Last hop (egress PE);
Could you Pls explain the benefit of similar behavior in PHP of MPLS world.=
  I think it may be same.

--------------------------------------
Cheers !


WANG Weibin

From: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 20:18
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com<mailto:we=
ibin.wang@nokia-sbell.com>>; Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.o=
rg<mailto:mrajesh=3D40juniper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamar=
il) <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>; SPRING WG List <spring=
@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Tj1RzlZX05hQXJCRb6NfbDmr4p543xmCTIQUDjQsIjiWMC6mn7vFFP39Imon9Has$>

I was more focused towards END.DT4 SID where behavior you mentioned is poss=
ible only if we do below optimization in https://tools.ietf.org/html/draft-=
dawra-bess-srv6-services-02<https://urldefense.com/v3/__https:/tools.ietf.o=
rg/html/draft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1w=
jCRKLg4MMbWlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$>  section 3.

when the received route is colored with an extended color community 'C' and=
 Next-Hop 'N', and the ingress PE has a valid SRv6 Policy (C, N) associated=
 with SID list <S1,S2, S3>, then the effective SR Policy is <S1, S2, SRv6-S=
ervice-SID>.Here if you see
S3 and SRv6-Service-SID both belong to Egress so s3 has been removed.


For you my query is removing only SRH header on PHP router will give what k=
ind of advantage ?

Thanks
Rajesh





Juniper Business Use Only
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Wang, Weibin (NSB - CN/Shanghai)
Sent: Friday, October 18, 2019 9:26 AM
To: Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D40jun=
iper.net@dmarc.ietf.org>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<m=
ailto:pcamaril@cisco.com>>; SPRING WG List <spring@ietf.org<mailto:spring@i=
etf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

The value of Segment Left field in SRH begin with 0, so [SL]=3D0 represent =
the last SID. in this case, when [SL] decrease 1, and the penultimate SRv6 =
node copy IPv6 SID corresponding to [SL]=3D0 to DA field of IP packet, when=
 enable PSP flavor at same time, the penultimate SRv6 node will check the [=
SL] value, if it is 0, then pop SRH, these extra action is pseudocode of PS=
P. This logic has no problem.


--------------------------------------
Cheers !


WANG Weibin

From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Rajesh M
Sent: 2019=1B$BG/=1B(B10=1B$B7n=1B(B18=1B$BF|=1B(B 6:38
To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.co=
m>>; SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw-lbbm$>

WANG had given below use case : But using existing PSP logic this will not =
work.
In below at PSP router updated SL will be 1 (since END.DT4 is still there) =
,so SRH pop won=1B$B!G=1B(Bt happen.



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }

WANG use case:
=1B$B!H=1B(BFor example in SRv6-based L3VPN service scenario, The ingress P=
E within SRv6-enabled domain can utilize SR-TE policy to enable TE-path fun=
ction when encapsulating and transiting L3VPN traffic, The Ingress PE push =
on customer packets with SID list representing SR-TE policy plus END.DT4 as=
 last SRv6 SID in SRH; So I think, each flavor of PSP/USP/USD can be design=
ed to perform in related SRv6 endpoint. Imaging the PSP, the penultimate En=
dpoint can perform PSP, e.g. copy the last SID (END.DT4) of SRH to destinat=
ion field of IPv6 header and POP the SRH, then forwarding it toward egress =
PE identified by DA=1B$B!I=1B(B







Juniper Business Use Only
From: Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.=
.com>>
Sent: Tuesday, October 15, 2019 10:13 PM
To: Rajesh M <mrajesh@juniper.net<mailto:mrajesh@juniper.net>>; SPRING WG L=
ist <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>; Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: Re: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-ne=
twork-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.=
org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6Rj=
C81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>

Rajesh,

This has already been replied less than one week ago... Please see:
https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/V0Zpj=
VLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7HGIr9o9$>
https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak<ht=
tps://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzR=
ZC0HKVgBYaYMCQVcTWrfak__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRX=
W3khd_OAByxCvaxs9Jw7P8QaU_7$>

Thanks,
Pablo.


From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> on b=
ehalf of Rajesh M <mrajesh=3D40juniper.net@dmarc.ietf.org<mailto:mrajesh=3D=
40juniper.net@dmarc.ietf.org>>
Date: Friday, 11 October 2019 at 03:47
To: SPRING WG List <spring@ietf.org<mailto:spring@ietf.org>>
Cc: Srihari Sangli <ssangli@juniper.net<mailto:ssangli@juniper.net>>, Shrad=
dha Hegde <shraddha@juniper.net<mailto:shraddha@juniper.net>>
Subject: [spring] https://tools.ietf.org/html/draft-ietf-spring-srv6-networ=
k-programming-04#page-24<https://urldefense.com/v3/__https:/tools.ietf.org/=
html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!8WoA6RjC81c=
!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQnV$>


Wanted to know the use case where we only POP the SRH ?

4.16.1<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-sp=
ring-srv6-network-programming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31=
cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$>..  PSP: Penultimat=
e Segment Pop of the SRH

   The SRH processing of the End, End.X and End.T behaviors are

   modified: after the instruction "S14.  Update IPv6 DA with Segment

   List[Segments Left]" is executed, the following instructions must be

   executed as well:



   S14.1.   If (updated SL =3D=3D 0) {

   S14.2.      Pop the SRH

   S14.3.   }



Juniper Business Use Only

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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Ketan,<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Previousl=
y in this thread, we have agreed on the following:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l1 level1 =
lfo3"><span style=3D"mso-fareast-language:EN-US">PSP and USP operate upon S=
RH with SL equal to zero<o:p></o:p></span></li><li class=3D"MsoListParagrap=
h" style=3D"margin-left:0in;mso-list:l1 level1 lfo3"><span style=3D"mso-far=
east-language:EN-US">SRH with SL equal to zero is a functional NOOP<o:p></o=
:p></span></li></ul>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Because S=
RH with SL equal to zero is a functional &nbsp;NOOP, there is limited value=
 is &nbsp;special operations that removes it.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Currently=
, there is an unresolved issue regarding whether a transit node can insert =
or remove extension headers in flight. As a result of that argument, END.B6=
.INSERT and T.INSERT have been moved
 to a separate document. You might want to move PSP and USP to that same do=
cument for the following reasons:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l1 level1 =
lfo3"><span style=3D"mso-fareast-language:EN-US">Moving PSP and USP will al=
low the network programming draft to progress before the larger issue of ex=
tension header insertion and removal is
 resolved<o:p></o:p></span></li><li class=3D"MsoListParagraph" style=3D"mar=
gin-left:0in;mso-list:l1 level1 lfo3"><span style=3D"mso-fareast-language:E=
N-US">Moving PSP and USP will prevent the network programming draft from be=
ing delayed over a functional NOOP.<o:p></o:p></span></li></ul>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:ZH-TW">From:<=
/span></b><span style=3D"mso-fareast-language:ZH-TW"> Ketan Talaulikar (ket=
ant) &lt;ketant@cisco.com&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 12:22 AM<br>
<b>To:</b> Rajesh M &lt;mrajesh@juniper.net&gt;; Rajesh M &lt;mrajesh=3D40j=
uniper.net@dmarc.ietf.org&gt;; Wang, Weibin (NSB - CN/Shanghai) &lt;weibin.=
wang@nokia-sbell.com&gt;; Pablo Camarillo (pcamaril) &lt;pcamaril@cisco.com=
&gt;; SPRING WG List &lt;spring@ietf.org&gt;; Peter Psenak (ppsenak)
 &lt;ppsenak@cisco.com&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;ssangli@juniper.net&gt;; Shraddha Hegde &lt;s=
hraddha@juniper.net&gt;; Ron Bonica &lt;rbonica@juniper.net&gt;<br>
<b>Subject:</b> RE: [spring] https://tools.ietf.org/html/draft-ietf-spring-=
srv6-network-programming-04#page-24<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">Hi Rajesh,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">T.insert is definitely not deprecated. Please check
</span><span lang=3D"EN-IN"><a href=3D"https://urldefense.com/v3/__https:/m=
ailarchive.ietf.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0__;!8WoA6RjC=
81c!WtxAEiukUUeEilxoIdc4jE3cAwZIAZ2aUNEwerDNWiOwERTh5iYkF1fepfb-GGcH$">http=
s://mailarchive.ietf.org/arch/msg/spring/zRwYRZrKEwzMor2cXpYiag--_y0</a>
 - I would suggest you go through the archives to get the history/context.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN">In fact, it is already deployed=
 &#8211; check <a href=3D"https://urldefense.com/v3/__https:/tools.ietf.org=
/html/draft-matsushima-spring-srv6-deployment-status-02__;!8WoA6RjC81c!WtxA=
EiukUUeEilxoIdc4jE3cAwZIAZ2aUNEwerDNWiOwERTh5iYkF1fepXkLxyf0$">
https://tools.ietf.org/html/draft-matsushima-spring-srv6-deployment-status-=
02</a></span><span lang=3D"EN-IN" style=3D"mso-fareast-language:EN-US"><o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US">Ketan<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:JA">From:</sp=
an></b><span style=3D"mso-fareast-language:JA"> Rajesh M &lt;<a href=3D"mai=
lto:mrajesh@juniper.net">mrajesh@juniper.net</a>&gt;
<br>
<b>Sent:</b> 19 October 2019 09:34<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.iet=
f.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Wang, Weibin (NSB - =
CN/Shanghai) &lt;<a href=3D"mailto:weibin.wang@nokia-sbell.com">weibin.wang=
@nokia-sbell.com</a>&gt;; Pablo Camarillo (pcamaril)
 &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;; SPRI=
NG WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;; =
Peter Psenak (ppsenak) &lt;<a href=3D"mailto:ppsenak@cisco.com">ppsenak@cis=
co.com</a>&gt;; Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisc=
o.com">ketant@cisco.com</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;; Ron Bonica &lt;<a href=3D"mailto:rboni=
ca@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-srv6-network-programming-04#page-24">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-IN"><o:p>&nbsp;</o:p></span></p>
<pre><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-=
language:EN-US">if we use </span><span style=3D"mso-fareast-language:EN-US"=
>T.Insert </span><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;=
mso-fareast-language:EN-US">Mode for TI-LFA then </span>PSP and USP <span s=
tyle=3D"mso-fareast-language:EN-US">Flavours </span>are useful.<o:p></o:p><=
/pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>T.insert mode is &nbsp;deprecated ? if Yes then PSP and USP <span styl=
e=3D"mso-fareast-language:EN-US">Flavours also must be </span>deprecated as=
 per me.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Thanks<o:p></o:p></pre>
<pre>Rajesh<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:JA">From:</sp=
an></b><span style=3D"mso-fareast-language:JA"> Rajesh M &lt;<a href=3D"mai=
lto:mrajesh=3D40juniper.net@dmarc.ietf.org">mrajesh=3D40juniper.net@dmarc.i=
etf.org</a>&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 7:59 AM<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;; Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh@juniper.net">mrajesh@juniper.net</a>&gt;; Pablo Camari=
llo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com=
</a>&gt;;
 SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&=
gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;; Ron Bonica &lt;<a href=3D"mailto:rboni=
ca@juniper.net">rbonica@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!WtxAEiukUUeEilxoIdc4jE3cAwZIAZ2aUNEwerDNWiOwERTh5iYkF1fepQn=
zb6U7$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">MPLS worl=
d PSP will help in avoiding one more lookup at egress for VPN cases.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">I feel </=
span>both PSP and USP are not useful in case of SRV6.<span style=3D"mso-far=
east-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a=
 href=3D"mailto:weibin.wang@nokia-sbell.com">weibin.wang@nokia-sbell.com</a=
>&gt;
<br>
<b>Sent:</b> Saturday, October 19, 2019 6:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarill=
o (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</=
a>&gt;;
 SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&=
gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!WtxAEiukUUeEilxoIdc4jE3cAwZIAZ2aUNEwerDNWiOwERTh5iYkF1fepQn=
zb6U7$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Hi Rajesh:<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">The answer to your =
question, I think, had better be provided by Authors of NET-PGM, You can al=
so refer to Ron=1B$B!G=1B(Bs email previously one or two days before who gi=
ve some guess, I think it make sense, in addition
 , also including processing-load mitigation in Last hop (egress PE); <o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">Could you Pls expla=
in the benefit of similar behavior in PHP of MPLS world. &nbsp;I think it m=
ay be same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt">------------------------------------=
--<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans=
-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">WANG Weibin&nbsp;
</span></b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roma=
n&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:JA">From:</sp=
an></b><span style=3D"mso-fareast-language:JA"> Rajesh M &lt;<a href=3D"mai=
lto:mrajesh@juniper.net">mrajesh@juniper.net</a>&gt;
<br>
<b>Sent:</b> 2019</span><span lang=3D"JA" style=3D"font-family:&quot;MS PGo=
thic&quot;,sans-serif;mso-fareast-language:JA">=1B$BG/=1B(B</span><span sty=
le=3D"mso-fareast-language:JA">10</span><span lang=3D"JA" style=3D"font-fam=
ily:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:JA">=1B$B7n=1B(B=
</span><span style=3D"mso-fareast-language:JA">18</span><span lang=3D"JA" s=
tyle=3D"font-family:&quot;MS PGothic&quot;,sans-serif;mso-fareast-language:=
JA">=1B$BF|=1B(B</span><span style=3D"mso-fareast-language:JA">
 20:18<br>
<b>To:</b> Wang, Weibin (NSB - CN/Shanghai) &lt;<a href=3D"mailto:weibin.wa=
ng@nokia-sbell.com">weibin.wang@nokia-sbell.com</a>&gt;; Rajesh M &lt;<a hr=
ef=3D"mailto:mrajesh=3D40juniper.net@dmarc.ietf.org">mrajesh=3D40juniper.ne=
t@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pcamaril)
 &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;; SPRI=
NG WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;<b=
r>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> RE: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Tj1RzlZX05hQXJCRb6NfbDmr4p543xmCTIQUDjQsIjiWMC6mn7vFFP39Imo=
n9Has$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">I was mor=
e focused towards END.DT4 SID where behavior you mentioned is possible only=
 if we do below optimization in
</span><a href=3D"https://urldefense.com/v3/__https:/tools.ietf.org/html/dr=
aft-dawra-bess-srv6-services-02__;!8WoA6RjC81c!VLXDHwQhv3Ai4Cky1wjCRKLg4MMb=
WlArh2rC0Srmtc6uKxdGYoSjuGxkKh-cx1pT$">https://tools.ietf.org/html/draft-da=
wra-bess-srv6-services-02</a>&nbsp; section
 3.<span style=3D"mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">when the received route is colored with an extended color =
community 'C' and Next-Hop 'N', and the ingress PE has a valid SRv6 Policy =
(C, N) associated with SID list &lt;S1,S2, S3&gt;, then
 the effective SR Policy is &lt;S1, S2, SRv6-Service-SID&gt;.Here if you se=
e <o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red">S3 and SRv6-Service-SID both belong to Egress=
 so s3 has been removed.<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red">For you my query is removing only SRH header =
on PHP router will give what kind of advantage ?<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;;color:red"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">Thanks<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Courier New&quot;">Rajesh<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 PGothic&quot;,sans-serif;mso-fareast-language:JA"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Wang, Weibin (NSB - CN/Shanghai)<br>
<b>Sent:</b> Friday, October 18, 2019 9:26 AM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dmarc.iet=
f.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;; Pablo Camarillo (pca=
maril) &lt;<a href=3D"mailto:pcamaril@cisco.com">pcamaril@cisco.com</a>&gt;=
; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>=
&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt">The value of Segmen=
t Left field in SRH begin with 0, so [SL]=3D0 represent the last SID. in th=
is case, when [SL] decrease 1, and the penultimate SRv6 node copy IPv6 SID =
corresponding to [SL]=3D0 to DA field of
 IP packet, when enable PSP flavor at same time, the penultimate SRv6 node =
will check the [SL] value, if it is 0, then pop SRH, these extra action is =
pseudocode of PSP. This logic has no problem.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt">------------------------------------=
--<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><i><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">Cheers !<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Arial&quot;,sans=
-serif"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roman&=
quot;,serif">WANG Weibin&nbsp;
</span></b><span style=3D"font-size:10.5pt;font-family:&quot;Times New Roma=
n&quot;,serif"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt"><o:p>&nbsp;</o:p></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;<a href=3D"mailto:spring-bou=
nces@ietf.org">spring-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Rajesh M<br>
<b>Sent:</b> 2019<span lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft =
YaHei&quot;,sans-serif">=1B$BG/=1B(B</span>10<span lang=3D"ZH-CN" style=3D"=
font-family:&quot;Microsoft YaHei&quot;,sans-serif">=1B$B7n=1B(B</span>18<s=
pan lang=3D"ZH-CN" style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-se=
rif">=1B$BF|=1B(B</span> 6:38<br>
<b>To:</b> Pablo Camarillo (pcamaril) &lt;<a href=3D"mailto:pcamaril@cisco.=
com">pcamaril@cisco.com</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:sprin=
g@ietf.org">spring@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Xvm3hzUGljwi9nBE2mtVYPtMItbLLS1EMD8VDmp4d3K0OZliIbHVQDKF1Nw=
-lbbm$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">WANG had given below use case : But using existing P=
SP logic this will not work.<o:p></o:p></p>
<p class=3D"MsoNormal">In below at PSP router updated SL will be 1 (since E=
ND.DT4 is still there) ,so SRH pop won=1B$B!G=1B(Bt happen.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">WANG use case:<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white">=1B$B!H=1B(BFor example in SRv6-based L3VPN se=
rvice scenario, The ingress PE within SRv6-enabled domain can utilize SR-TE=
 policy to enable TE-path function when encapsulating
 and transiting L3VPN traffic, The Ingress PE push on customer packets with=
 SID list representing SR-TE policy plus END.DT4 as last SRv6 SID in SRH; S=
o I think, each flavor of PSP/USP/USD can be designed to perform in related=
 SRv6 endpoint. Imaging the PSP,
 the penultimate Endpoint can perform PSP, e.g. copy the last SID (END.DT4)=
 of SRH to destination field of IPv6 header and POP the SRH, then forwardin=
g it toward egress PE identified by DA=1B$B!I=1B(B<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:9.5pt;font-family:Menlo;col=
or:#212529;background:white"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Pablo Camarillo (pcamaril) &lt;<a href=
=3D"mailto:pcamaril@cisco..com">pcamaril@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 10:13 PM<br>
<b>To:</b> Rajesh M &lt;<a href=3D"mailto:mrajesh@juniper.net">mrajesh@juni=
per.net</a>&gt;; SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spri=
ng@ietf.org</a>&gt;<br>
<b>Cc:</b> Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject:</b> Re: [spring] <a href=3D"https://urldefense.com/v3/__https:/=
tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__=
;Iw!8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3k=
DJQnV$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Rajesh,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This has already been replied less than one week ago=
... Please see:
<o:p></o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://urldefense.com/v3/__https:/mailar=
chive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c__;!8WoA6RjC81c!W=
8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7HGIr9o9$">https://m=
ailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c</a><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES"><a href=3D"https://urldefense.com/=
v3/__https:/mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfa=
k__;!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIhuJzRXW3khd_OAByxCvaxs9Jw7P=
8QaU_7$"><span lang=3D"EN-US">https://mailarchive.ietf.org/arch/msg/spring/=
WrYzRZC0HKVgBYaYMCQVcTWrfak</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"ES">Pablo.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span lang=3D"ES" styl=
e=3D"font-size:12.0pt;color:black">From:
</span></b><span lang=3D"ES" style=3D"font-size:12.0pt;color:black">spring =
&lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@ietf.org</a>&=
gt; on behalf of Rajesh M &lt;<a href=3D"mailto:mrajesh=3D40juniper.net@dma=
rc.ietf.org">mrajesh=3D40juniper.net@dmarc.ietf.org</a>&gt;<br>
<b>Date: </b>Friday, 11 October 2019 at 03:47<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org">spring@iet=
f.org</a>&gt;<br>
<b>Cc: </b>Srihari Sangli &lt;<a href=3D"mailto:ssangli@juniper.net">ssangl=
i@juniper.net</a>&gt;, Shraddha Hegde &lt;<a href=3D"mailto:shraddha@junipe=
r.net">shraddha@juniper.net</a>&gt;<br>
<b>Subject: </b>[spring] <a href=3D"https://urldefense.com/v3/__https:/tool=
s.ietf.org/html/draft-ietf-spring-srv6-network-programming-04*page-24__;Iw!=
8WoA6RjC81c!Wogoc-HBxWprNFIMxDGoprcCPpEqeSUK6WmLst9CNbljhrh-Ur4yOghFj3kDJQn=
V$">
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-04#p=
age-24</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">Wanted to know the use ca=
se where we only POP the SRH ?<o:p></o:p></span></pre>
<h4 style=3D"margin-left:.5in"><span lang=3D"ES"><a href=3D"https://urldefe=
nse.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-prog=
ramming-04*section-4.16.1__;Iw!8WoA6RjC81c!W8zXtokq31cYlPoLJ6Ip-BlyXApb7JIh=
uJzRXW3khd_OAByxCvaxs9Jw7DAv5v98$">4.16.1</a></span><a name=3D"section-4.16=
...1"></a><span lang=3D"ES" style=3D"font-family:&quot;Courier New&quot;">.=
.&nbsp;
 PSP: Penultimate Segment Pop of the SRH</span><span lang=3D"ES"><o:p></o:p=
></span></h4>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; The SRH proc=
essing of the End, End.X and End.T behaviors are<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; modified: af=
ter the instruction &quot;S14.&nbsp; Update IPv6 DA with Segment<o:p></o:p>=
</span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; List[Segment=
s Left]&quot; is executed, the following instructions must be<o:p></o:p></s=
pan></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; executed as =
well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<o:p></o:p></span><=
/pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.1.&nbsp;=
&nbsp; If (updated SL =3D=3D 0) {<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.2.&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; Pop the SRH<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;&nbsp; S14.3.&nbsp;=
&nbsp; }<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES">&nbsp;<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span lang=3D"ES"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.00=
01pt;text-align:center">
<span lang=3D"ES" style=3D"font-size:7.0pt;color:black">Juniper Business Us=
e Only</span><span lang=3D"ES"><o:p></o:p></span></p>
</div>
</body>
</html>

--_000_BN7PR05MB56999B51AD8900FAB1234BC2AE690BN7PR05MB5699namp_--


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: 'SPRING WG List' <spring@ietf.org>
CC: "spring-chairs@ietf.org" <spring-chairs@ietf.org>, "Dongjie (Jimmy)" <jie.dong@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/LgWBdO-DGqTEvUYlyQwiFToxD8o>
Subject: Re: [spring] Request for WG adoption of draft-dong-spring-sr-for-enhanced-vpn-05
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Hi all,

I have read the document and I think that matches the two criteria that ar=
e usually considered for deciding whether the draft can be adopted:

1.       It discusses a high relevant problem within the scope of the WG C=
harter

2.       It provides a reasonable basis for the solution of this problem.



At the same time I have some concerns about this draft. These concerns are=
 not blockers for adoption, but, IMHOL and FWIW, should be resolved before=
 the draft moves further.



Several fragments in Section 2.1 need some additional work IMHO. E.g. (the=
 problematic fragments are highlighted)::



1.       The following text may be misleading


   For one particular IGP link, multiple Adj-SIDs SHOULD be allocated,
   each of which is associated with a particular virtual network
   topology, and MAY represent a subset of link resources.  Several
   approaches can be used to partition the link resource, such as
   logical sub-interfaces, dedicated queues, etc.



I am not sure a single IGP link can be split=20into multiple logical sub-i=
nterfaces. As I see it, logical sub-interfaces of a link usually act as in=
dividual IGP links of and by themselves.



2.       Immediately after that the draft says that:



   Similarly, for one particular IGP node, multiple node-SIDs SHOULD be

   allocated, each of which is associated with a specific virtual

   network topology, and may represent a subset of the node resource

   (e.g. the processing resources).



I wonder why only Node-SIDs and not any Prefix-SID can be associated with =
 a specific virtual topology. Among other things, such a restriction preve=
nts using Anycast SIDs (which, by definition, are not Node-SIDs).



3.       The following text seems to contradict the basic architecture of =
SR:



   A group of adj-SIDs and node-SIDs associated with the same virtual

   network can be used to construct the SR SID-lists (either strict or

   loose) to steer the traffic of a particular enhanced VPN service.

   This group of SIDs MAY also represent the set of network resources

   which are reserved for a specific enhanced VPN, or a group of

   enhanced VPNs.



It seems to suggest that a list of SIDs may be associated with a particula=
r network resource while specific SIDs in this list are not associated wit=
h this resource. But in SR-MPLS, only the current active SID defines all a=
spects of the packet disposition, including the resources used for its for=
warding.





4.       The following restriction looks excessively strong to me:



When a node-SID is used in the SID-list to build an SR loose path, the

transit nodes use the node-SID to identify the virtual network, and

MAY process the packet using the local resources allocated for the

corresponding virtual network.  Note in this case, Penultimate Hop

Popping (PHP) [RFC3031<https://tools.ietf.org/html/rfc3031>] MUST be disab=
led.



IMHO and FWIW the no PHP requirement may be relaxed, because the virtual t=
opology and the resources associated with it would be derived from the nex=
t active SID (if any). And if there is no next SID, these resources could =
be inferred from the specific instance of the enhanced VPN service.  (Mayb=
e the draft should explicitly state that a given enhanced VPN service inst=
ance should be restricted to using a given virtual topology and a given se=
t of network resources.)



The procedures described in Section 4 of the draft seem to assume that eac=
h enhanced VPN service will use its own virtual topology and resources in =
the underlay.

At the same time the draft mentions in many places that a given virtual to=
pology and its associated set of network resources can be used by a group =
of enhanved VPN service instances.

The latter looks like a much nore scalable approach to me.



As already mentioned, I do not see any of my comments as blockers for adop=
tion of the draft.  Hopefully they will be useful.



Regards,

Sasha



Office: +972-39266302

Cell:      +972-549266302

Email:   Alexander.Vainshtein@ecitele.com





-----Original Message-----
From: spring <spring-bounces@ietf.org> On Behalf Of Dongjie (Jimmy)
Sent: Monday, October 21, 2019 8:22 AM
To: 'SPRING WG List' <spring@ietf.org>
Cc: spring-chairs@ietf.org
Subject: [spring] Request for WG adoption of draft-dong-spring-sr-for-enha=
nced-vpn-05



Dear WG and Chairs,



A new revision of draft-dong-spring-sr-for-enhanced-vpn has been uploaded =
to resolve some recently received comments. This document describes the Se=
gment Routing based mechanism to provide enhanced VPN, which aligns with t=
he enhanced VPN (VPN)+ framework document in TEAS WG. The mechanism could =
be used to enable transport network slicing for 5G.



The major changes compared to the -04 version are:



  1. Update the draft template.



  2. Add reference to the definition of network slicing in 3GPP TS23.501 a=
nd the definition of transport network slicing in draft-ietf-teas-enhanced=
-vpn-03 respectively.



  3. Editorial changes in several sections to clarify and improve the read=
ability.



  4. Change some coauthors' affiliation and mail address.



This update shows that the major content of this draft has become stable a=
nd solid, thus the authors would like to request the WG to consider the ad=
option of this document.



Comments are always welcome. Thanks.



Best regards,

Jie



-----Original Message-----

From: internet-drafts@ietf.org<mailto:internet-drafts@ietf.org> [mailto:in=
ternet-drafts@ietf.org]

Sent: Wednesday, October 16, 2019 3:28 PM

To: Takuya Miyasaka <ta-miyasaka@kddi.com<mailto:ta-miyasaka@kddi.com>>; Z=
henqiang Li <li_zhenqiang@hotmail.com<mailto:li_zhenqiang@hotmail.com>>; F=
engwei Qin <qinfengwei@chinamobile.com<mailto:qinfengwei@chinamobile.com>>=
; Stewart Bryant <stewart.bryant@gmail.com<mailto:stewart.bryant@gmail.com=
>>; Yongqing Zhu <zhuyq.gd@chinatelecom.cn<mailto:zhuyq.gd@chinatelecom.cn=
>>; Dongjie (Jimmy) <jie.dong@huawei.com<mailto:jie.dong@huawei.com>>

Subject: New Version Notification for draft-dong-spring-sr-for-enhanced-vp=
n-05.txt





A new version of I-D, draft-dong-spring-sr-for-enhanced-vpn-05.txt

has been successfully submitted by Jie Dong and posted=20to the IETF repos=
itory.



Name:                  draft-dong-spring-sr-for-enhanced-vpn

Revision:              05

Title:                      Segment Routing for Enhanced VPN Service

Document date:               2019-10-16

Group:                  Individual Submission

Pages:                   20

URL:            https://clicktime.symantec.com/3ALPFrm3RynBsKbF1oU2uum6H2?=
u=3Dhttps%3A%2F%2Fwww.ietf.org%2Finternet-drafts%2Fdraft-dong-spring-sr-fo=
r-enhanced-vpn-05.txt

Status:         https://clicktime.symantec.com/3Ke26NtAMQpPmNpsJSjbjfC6H2?=
u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-dong-spring-sr-for-en=
hanced-vpn%2F

Htmlized:       https://clicktime.symantec.com/38csYFW7vnAShtJtkSWCXTa6H2?=
u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-dong-spring-sr-for-enhance=
d-vpn-05

Htmlized:       https://clicktime.symantec.com/354AuwRvQiKbYh6cGRF6EnT6H2?=
u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-dong-spring-sr=
-for-enhanced-vpn

Diff:           https://clicktime.symantec.com/3HgF1QzcMezZQRxNmfgfoeE6H2?=
u=3Dhttps%3A%2F%2Fwww.ietf.org%2Frfcdiff%3Furl2%3Ddraft-dong-spring-sr-for=
-enhanced-vpn-05



Abstract:

   Enhanced VPN (VPN+) is an enhancement to VPN services to enable it to

   support the needs of new applications, particularly applications that

   are associated with 5G services.  These applications require better

   isolation from both control and data plane's perspective and have

   more stringent performance requirements than can be provided with

   overlay VPNs.  The characteristics of an enhanced VPN as perceived by

   its tenant needs to be comparable to those of a dedicated private

   network.  This requires tight integration between the overlay VPN and

   the underlay network topology and resources in a scalable manner.  An

   enhanced VPN may form the underpinning of 5G network slicing, but

   will also be of use in its own right.  This document describes how to

   use segment routing based mechanisms to provide the enhanced VPN

   service with the required network topology and=20resources.  The

   overall mechanism of providing segment routing based enhanced VPN

   service is also described.  The proposed mechanism is applicable to

   both segment routing with MPLS data plane (SR-MPLS) and segment

   routing with IPv6 data plane (SRv6).











Please note that it may take a couple of minutes from the time of submissi=
on until the htmlized version and diff are available at tools.ietf.org.



The IETF Secretariat



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<p class=3D"MsoPlainText">Hi all,<o:p></o:p></p>
<p class=3D"MsoPlainText">I have read the document and I think that matche=
s the two criteria that are usually considered for deciding whether the dr=
aft can be adopted:<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;=
mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">1.<span style=3D"font=
:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>It discusses a high relev=
ant problem within the scope of the WG Charter<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;=
mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">2.<span style=3D"font=
:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>It provides a reasonable =
basis for the solution of this problem.
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">At the same time I have some concerns about this=
 draft. These concerns are not blockers for adoption, but, IMHOL and FWIW,=
 should be resolved before the draft moves further.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Several fragments in Section 2.1 need some addit=
ional work IMHO. E.g. (the problematic fragments are
<span style=3D"background:yellow;mso-highlight:yellow">highlighted</span>)=
::<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;=
mso-list:l1 level1 lfo3">
<![if !supportLists]><span style=3D"mso-list:Ignore">1.<span style=3D"font=
:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The following text may be=
 misleading
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-si=
ze:10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; Fo=
r
<span style=3D"background:yellow;mso-highlight:yellow">one particular IGP =
link</span>, multiple Adj-SIDs SHOULD be allocated,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-si=
ze:10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; ea=
ch of which is associated with a particular virtual network<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-si=
ze:10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; to=
pology, and MAY represent a subset of link resources.&nbsp; Several<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-si=
ze:10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; ap=
proaches can be used to partition the link resource, such as<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-si=
ze:10.0pt;font-family:&quot;Courier New&quot;;color:black">&nbsp;&nbsp;
<span style=3D"background:yellow;mso-highlight:yellow">logical sub-interfa=
ces</span>, dedicated queues, etc.&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText" style=3D"text-indent:36.0pt">I am not sure a sin=
gle IGP link can be split into multiple logical sub-interfaces. As I see i=
t, logical sub-interfaces of a link usually act as individual IGP links of=
 and by themselves.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;=
mso-list:l1 level1 lfo3">
<![if !supportLists]><span style=3D"mso-list:Ignore">2.<span style=3D"font=
:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>Immediately after that th=
e draft says that:
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black">&nbsp;&nbsp;=
 Similarly, for one particular IGP node, multiple <span style=3D"backgroun=
d:yellow;mso-highlight:yellow">node-SIDs SHOULD be<o:p></o:p></span></span=
></pre>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black;background:ye=
llow;mso-highlight:yellow">&nbsp;&nbsp; allocated, each of which is associ=
ated with a specific virtual<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black;background:ye=
llow;mso-highlight:yellow">&nbsp;&nbsp; network topolog</span><span style=3D=
"color:black">y, and may represent a subset of the node resource<o:p></o:p=
></span></pre>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black">&nbsp;&nbsp;=
 (e.g. the processing resources).<o:p></o:p></span></pre>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText" style=3D"text-indent:36.0pt">I wonder why only N=
ode-SIDs and not any Prefix-SID can be associated with &nbsp;a specific vi=
rtual topology. Among other things, such a restriction prevents using Anyc=
ast SIDs (which, by definition, are not Node-SIDs).<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"text-indent:36.0pt"><o:p>&nbsp;</o:p></=
p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;=
mso-list:l1 level1 lfo3">
<![if !supportLists]><span style=3D"mso-list:Ignore">3.<span style=3D"font=
:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The following text seems =
to contradict the basic architecture of SR:<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt"><o:p>&nbsp;</o:p></=
p>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black">&nbsp;&nbsp;=
 A group of adj-SIDs and node-SIDs associated with the same virtual<o:p></=
o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black">&nbsp;&nbsp;=
 network can be used to construct the <span style=3D"background:yellow;mso=
-highlight:yellow">SR SID-lists</span> (either strict or<o:p></o:p></span>=
</pre>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black">&nbsp;&nbsp;=
 loose) to steer the traffic of a particular enhanced VPN service.<o:p></o=
:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black">&nbsp;&nbsp;=
 This <span style=3D"background:yellow;mso-highlight:yellow">group of SIDs=
 MAY also represent the set of network resources</span><o:p></o:p></span><=
/pre>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black">&nbsp;&nbsp;=
 which are reserved for a specific enhanced VPN, or a group of<o:p></o:p><=
/span></pre>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black">&nbsp;&nbsp;=
 enhanced VPNs.<o:p></o:p></span></pre>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt"><o:p>&nbsp;</o:p></=
p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt">It seems to suggest=
 that a list of SIDs may be associated with a particular network resource =
while specific SIDs in this list are not associated with this resource. Bu=
t in SR-MPLS, only the current active SID
 defines all aspects of the packet disposition, including the resources us=
ed for its forwarding.
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt"><o:p>&nbsp;</o:p></=
p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt"><o:p>&nbsp;</o:p></=
p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;=
mso-list:l1 level1 lfo3">
<![if !supportLists]><span style=3D"mso-list:Ignore">4.<span style=3D"font=
:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The following restriction=
 looks excessively strong to me:<o:p></o:p></p>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"margin-left:45.8pt"><span style=3D"color:black">When a node-=
SID is used in the SID-list to build an SR loose path, the <o:p></o:p></sp=
an></pre>
<pre style=3D"margin-left:45.8pt"><span style=3D"color:black">transit node=
s use the node-SID to identify the virtual network, and<o:p></o:p></span><=
/pre>
<pre style=3D"margin-left:45.8pt"><span style=3D"color:black">MAY process =
the packet using the local resources allocated for the<o:p></o:p></span></=
pre>
<pre style=3D"margin-left:45.8pt"><span style=3D"color:black">correspondin=
g virtual network.&nbsp; <span style=3D"background:yellow;mso-highlight:ye=
llow">Note in this case, Penultimate Hop<o:p></o:p></span></span></pre>
<pre style=3D"margin-left:45.8pt"><span style=3D"color:black;background:ye=
llow;mso-highlight:yellow">Popping (PHP) [<a href=3D"https://tools.ietf.or=
g/html/rfc3031" title=3D"&quot;Multiprotocol Label Switching Architecture&=
quot;">RFC3031</a>] MUST be disabled</span><span style=3D"color:black">.<o=
:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">IMHO and FWIW the no PHP requirement m=
ay be relaxed, because the virtual topology and the resources associated w=
ith it would be derived from the next active SID (if any). And if there is=
 no next SID, these resources could be inferred from the specific instance=
 of the enhanced VPN service. &nbsp;(Maybe the draft should explicitly sta=
te that a given enhanced VPN service instance should be restricted to usin=
g a given virtual topology and a given set of network resources.)<o:p></o:=
p></span></pre>
<pre style=3D"margin-left:36.0pt"><span style=3D"color:black"><o:p>&nbsp;<=
/o:p></span></pre>
<p class=3D"MsoPlainText">The procedures described in Section 4 of the dra=
ft seem to assume that each enhanced VPN service will use its own virtual =
topology and resources in the underlay.<o:p></o:p></p>
<p class=3D"MsoPlainText">At the same time the draft mentions in many plac=
es that a given virtual topology and its associated set of network resourc=
es can be used by a group of enhanved VPN service instances.<o:p></o:p></p=
>
<p class=3D"MsoPlainText">The latter looks like a much nore scalable appro=
ach to me.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">As already mentioned, I do not see any of my com=
ments as blockers for adoption of the draft. &nbsp;Hopefully they will be =
useful.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">Sasha<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoPlainText">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549=
266302<o:p></o:p></p>
<p class=3D"MsoPlainText">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.=
com<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">-----Original Message-----<br>
From: spring &lt;spring-bounces@ietf.org&gt; On Behalf Of Dongjie (Jimmy)<=
br>
Sent: Monday, October 21, 2019 8:22 AM<br>
To: 'SPRING WG List' &lt;spring@ietf.org&gt;<br>
Cc: spring-chairs@ietf.org<br>
Subject: [spring] Request for WG adoption of draft-dong-spring-sr-for-enha=
nced-vpn-05</p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Dear WG and Chairs, <o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">A new revision of draft-dong-spring-sr-for-enhan=
ced-vpn has been uploaded to resolve some recently received comments. This=
 document describes the Segment Routing based mechanism to provide enhance=
d VPN, which aligns with the enhanced
 VPN (VPN)&#43; framework document in TEAS WG. The mechanism could be used=
 to enable transport network slicing for 5G.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">The major changes compared to the -04 version ar=
e:<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp; 1. Update the draft template. <o:p></o:p>=
</p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp; 2. Add reference to the definition of net=
work slicing in 3GPP TS23.501 and the definition of transport network slic=
ing in draft-ietf-teas-enhanced-vpn-03 respectively.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp; 3. Editorial changes in several sections =
to clarify and improve the readability.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp; 4. Change some coauthors' affiliation and=
 mail address.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">This update shows that the major content of this=
 draft has become stable and solid, thus the authors would like to request=
 the WG to consider the adoption of this document.
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Comments are always welcome. Thanks.<o:p></o:p><=
/p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Best regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">Jie<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">-----Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText">From: <a href=3D"mailto:internet-drafts@ietf.org=
"><span style=3D"color:windowtext;text-decoration:none">internet-drafts@ie=
tf.org</span></a> [<a href=3D"mailto:internet-drafts@ietf.org"><span style=
=3D"color:windowtext;text-decoration:none">mailto:internet-drafts@ietf.org=
</span></a>]
<o:p></o:p></p>
<p class=3D"MsoPlainText">Sent: Wednesday, October 16, 2019 3:28 PM<o:p></=
o:p></p>
<p class=3D"MsoPlainText">To: Takuya Miyasaka &lt;<a href=3D"mailto:ta-miy=
asaka@kddi.com"><span style=3D"color:windowtext;text-decoration:none">ta-m=
iyasaka@kddi.com</span></a>&gt;; Zhenqiang Li &lt;<a href=3D"mailto:li_zhe=
nqiang@hotmail.com"><span style=3D"color:windowtext;text-decoration:none">=
li_zhenqiang@hotmail.com</span></a>&gt;;
 Fengwei Qin &lt;<a href=3D"mailto:qinfengwei@chinamobile.com"><span style=
=3D"color:windowtext;text-decoration:none">qinfengwei@chinamobile.com</spa=
n></a>&gt;; Stewart Bryant &lt;<a href=3D"mailto:stewart.bryant@gmail.com"=
><span style=3D"color:windowtext;text-decoration:none">stewart.bryant@gmai=
l.com</span></a>&gt;;
 Yongqing Zhu &lt;<a href=3D"mailto:zhuyq.gd@chinatelecom.cn"><span style=3D=
"color:windowtext;text-decoration:none">zhuyq.gd@chinatelecom.cn</span></a=
>&gt;; Dongjie (Jimmy) &lt;<a href=3D"mailto:jie.dong@huawei.com"><span st=
yle=3D"color:windowtext;text-decoration:none">jie.dong@huawei.com</span></=
a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">Subject: New Version Notification for draft-dong=
-spring-sr-for-enhanced-vpn-05.txt<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">A new version of I-D, draft-dong-spring-sr-for-e=
nhanced-vpn-05.txt<o:p></o:p></p>
<p class=3D"MsoPlainText">has been successfully submitted by Jie Dong and =
posted to the IETF repository.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Name:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; draft-dong-spr=
ing-sr-for-enhanced-vpn<o:p></o:p></p>
<p class=3D"MsoPlainText">Revision:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 05<o:p></o:p></p>
<p class=3D"MsoPlainText">Title:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; Segment Routing for Enhanced VPN Service<o:p></o:p></p>
<p class=3D"MsoPlainText">Document date:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2019-10-16<o:p></o:p></=
p>
<p class=3D"MsoPlainText">Group:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Individual Su=
bmission<o:p></o:p></p>
<p class=3D"MsoPlainText">Pages:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 20<o:p>=
</o:p></p>
<p class=3D"MsoPlainText">URL:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp; <a href=3D"https://clicktime.symantec.com/3ALPFrm3R=
ynBsKbF1oU2uum6H2?u=3Dhttps%3A%2F%2Fwww.ietf.org%2Finternet-drafts%2Fdraft=
-dong-spring-sr-for-enhanced-vpn-05.txt">
<span style=3D"color:windowtext;text-decoration:none">https://clicktime.sy=
mantec.com/3ALPFrm3RynBsKbF1oU2uum6H2?u=3Dhttps%3A%2F%2Fwww.ietf.org%2Fint=
ernet-drafts%2Fdraft-dong-spring-sr-for-enhanced-vpn-05.txt</span></a><o:p=
></o:p></p>
<p class=3D"MsoPlainText">Status:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; <a href=3D"https://clicktime.symantec.com/3Ke26NtAMQpPmNpsJSjbjfC6=
H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-dong-spring-sr-for=
-enhanced-vpn%2F">
<span style=3D"color:windowtext;text-decoration:none">https://clicktime.sy=
mantec.com/3Ke26NtAMQpPmNpsJSjbjfC6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.o=
rg%2Fdoc%2Fdraft-dong-spring-sr-for-enhanced-vpn%2F</span></a><o:p></o:p><=
/p>
<p class=3D"MsoPlainText">Htmlized:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=
 href=3D"https://clicktime.symantec.com/38csYFW7vnAShtJtkSWCXTa6H2?u=3Dhtt=
ps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-dong-spring-sr-for-enhanced-vpn-0=
5">
<span style=3D"color:windowtext;text-decoration:none">https://clicktime.sy=
mantec.com/38csYFW7vnAShtJtkSWCXTa6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fh=
tml%2Fdraft-dong-spring-sr-for-enhanced-vpn-05</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText">Htmlized:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=
 href=3D"https://clicktime.symantec.com/354AuwRvQiKbYh6cGRF6EnT6H2?u=3Dhtt=
ps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-dong-spring-sr-for-en=
hanced-vpn">
<span style=3D"color:windowtext;text-decoration:none">https://clicktime.sy=
mantec.com/354AuwRvQiKbYh6cGRF6EnT6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.o=
rg%2Fdoc%2Fhtml%2Fdraft-dong-spring-sr-for-enhanced-vpn</span></a><o:p></o=
:p></p>
<p class=3D"MsoPlainText">Diff:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; <a href=3D"https://clicktime.symantec.com/3HgF1QzcMezZQR=
xNmfgfoeE6H2?u=3Dhttps%3A%2F%2Fwww.ietf.org%2Frfcdiff%3Furl2%3Ddraft-dong-=
spring-sr-for-enhanced-vpn-05">
<span style=3D"color:windowtext;text-decoration:none">https://clicktime.sy=
mantec.com/3HgF1QzcMezZQRxNmfgfoeE6H2?u=3Dhttps%3A%2F%2Fwww.ietf.org%2Frfc=
diff%3Furl2%3Ddraft-dong-spring-sr-for-enhanced-vpn-05</span></a><o:p></o:=
p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Abstract:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; Enhanced VPN (VPN&#43;) is an enhan=
cement to VPN services to enable it to<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; support the needs of new applicatio=
ns, particularly applications that<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; are associated with 5G services.&nb=
sp; These applications require better<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; isolation from both control and dat=
a plane's perspective and have<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; more stringent performance requirem=
ents than can be provided with<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; overlay VPNs.&nbsp; The characteris=
tics of an enhanced VPN as perceived by<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; its tenant needs to be comparable t=
o those of a dedicated private<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; network.&nbsp; This requires tight =
integration between the overlay VPN and<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; the underlay network topology and r=
esources in a scalable manner.&nbsp; An<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; enhanced VPN may form the underpinn=
ing of 5G network slicing, but<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; will also be of use in its own righ=
t.&nbsp; This document describes how to<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; use segment routing based mechanism=
s to provide the enhanced VPN<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; service with the required network t=
opology and resources. &nbsp;The<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; overall mechanism of providing segm=
ent routing based enhanced VPN<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; service is also described.&nbsp; Th=
e proposed mechanism is applicable to<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; both segment routing with MPLS data=
 plane (SR-MPLS) and segment<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; routing with IPv6 data plane (SRv6)=
.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
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</o:p></p>
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<p class=3D"MsoPlainText">Please note that it may take a couple of minutes=
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Rishabh Parekh (riparekh)" <riparekh@cisco.com>
CC: "spring@ietf.org" <spring@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "zzhang@juniper.net" <zzhang@juniper.net>, "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>
Thread-Topic: Some questions regarding Replication SID
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Subject: Re: [spring] Some questions regarding Replication SID
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Rishabh,
Lots of thanks for a prompt response and apologies for the delays.

Please see more inline below.
Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: Rishabh Parekh (riparekh) <riparekh@cisco.com>
Sent: Thursday, October 17, 2019 9:38 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com>; ho=
oman.bidgoli@nokia.com; zzhang@juniper.net; daniel.voyer@bell.ca
Subject: RE: Some questions regarding Replication SID

Sasha,


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you=
 point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) th=
at represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actua=
lly I wanted to ask whether the SIDs in the list that represent a specific=
 Replication Branch are the SIDs defined in RFC 8204. The text I see in th=
e SR P2MP Policy<https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6H2=
?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-policy-=
00> draft seems to suggest that it is not necessarily so  because a Tree-S=
ID is considered also as the Replication SID. This looks inconsistent to m=
e because a Replication SID as defined in this draft is instantiated both =
in the Replication node and in the Downstream nodes while the Tree-SID doe=
s not require instantiation in the Leaf nodes (this is optional).

[RP]I am not sure I completely understand your questions above. Let's brea=
k them down and see if my responses clarify them:
Actually I wanted to ask whether the SIDs in the list that represent a spe=
cific Replication Branch are the SIDs defined in RFC 8204
[RP] I think my responses to questions 2 and 3 in your original e-mail sho=
uld make this clear. Let me know if it is not.

The text I see in the SR P2MP Policy<https://clicktime.symantec.com/3KYcTh=
6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer=
-pim-sr-p2mp-policy-00> draft seems to suggest that it is not necessarily =
so  because a Tree-SID is considered also as the Replication SID.
[RP]SR P2MP Policy draft specifies a way to create P2MP trees by stitching=
 Replication Segments together. The Replication SID of the Replication seg=
ment at root of a tree is called Tree-SID since this SID allows packets to=
 be replicated across the tree.

This looks inconsistent to me because a Replication SID as defined in this=
 draft is instantiated both in the Replication node and in the Downstream =
nodes while the Tree-SID does not require instantiation in the Leaf nodes =
(this is optional).
[RP]Replication segment draft describes how a *single* Replication segment=
 can be used for a Multi-point service. In that case, the Replication SID =
at downstream nodes (which are the Leaf nodes of the service) is used to d=
erive service context. The P2MP policy draft  makes Replication segments a=
t Leaf nodes OPTIONAL when it is possible to derive service context from s=
ome other information in the packet. Thinking more about this, even for th=
e single Replication segment, it might be possible to avoid instantiation =
at Downstream nodes when service context can be derived from some other in=
formation in the packet. We might consider this for next revision.
[[Sasha]] I am confused now. From my POV either the Replication SID MUST b=
e represented both in the Replication node and in all Downstream nodes, or=
 it MUST be local for the Replication Node only. In the first case its han=
dling effectively is CONTINUE in each Replication Branch, in the second ca=
se it is NEXT in each Replication Branch. I do not see how you can have tw=
o different kinds of handling for the same type of SID.



[RP] You are right in that it does not matter how Replication segment is i=
nstantiated at a node. The use of PCE is relevant for SR P2MP Policy<https=
://clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PC=
E instantiates Replication segments.[[Sasha]] OK, I will  look up the seco=
nd draft. BTW, it does not appear as a reference in this one - is it inten=
tional?
[RP]The P2MP policy draft uses Replication segment draft as a base, but it=
 is not the other way around. We can add a Informative reference in next r=
evision if you think it will help.[[Sasha]] It would help IMHO.


1. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of =
SR is to simplify. The idea is same here - use replication segments to rea=
lize P2MP trees computed by PCE (without need of multicast protocols) as s=
pecified in SR P2MP draft[[Sasha]] One of the well-known aspects that make=
 multicast different is that the traffic in the Service Provider domain is=
 driven by the dynamic customer requests. Handling these requests via a PC=
E looks problematic to me.
[RP]SR P2MP MVPN<https://clicktime.symantec.com/329erDXYCoUNudUpd4NoApR6H2=
?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-parekh-bess-mvpn-sr-=
p2mp%2F> draft,  which will be updated soon, specifies procedures for dyna=
mic updates SR P2MP trees using BGP MVPN; this includes dampening procedur=
es to control interaction between PCC (root of tree) and PCE.
[[Sasha]] I will look up this draft as well.

Pleade note that if the anser to #3 in my original message is positive, th=
en the statement in the draft that say the Replication Segment is similar =
to the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the =
Replication segment at Root (or Headend) node can be used as a (constant) =
Binding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and th=
e Replication SID as defined here is that the former is instantiated just =
locally while the Replication SID is instantiated both in the Replication =
node and in the Downstream nodes.
[RP]Here we use "Binding SID" to denote that fact that Replication SID (or=
 Tree-SID for P2MP trees) at the Root MAY be used as a constant SID that a=
llows packets to be steered into a Replication segment or a P2MP tree. Not=
e the drafts do not exclude the possibility that Replication SIDs at downs=
tream nodes or non-Root Replication segments can change.[[Sasha]] Please s=
ee above.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Wednesday, October 16, 2019 10:26 PM
To: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.co=
m>>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Clarence Filsfils (cfilsfil) =
<cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<=
mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper=
.net>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Subject: RE: Some questions regarding Replication SID

Re-sending with corrected To and CC lists...

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>

From: Alexander Vainshtein
Sent: Thursday, October 17, 2019 8:25 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Rishabh Parekh (riparekh) <ri=
parekh@cisco.com<mailto:riparekh@cisco.com>>; Clarence Filsfils (cfilsfil)=
 <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com=
<mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@junipe=
r.net>
Subject: RE: Some questions regarding Replication SID

Rishabh,
Lots of thanks for a prompt and detailed response.

Please see more inline below.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>

From: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.=
com>>
Sent: Thursday, October 17, 2019 1:24 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexande=
r.Vainshtein@ecitele.com>>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.=
ca>; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisc=
o.com>>; hooman.bidgoli@nokia.com<mailto:hooman.bidgoli@nokia.com>; zzhang=
@juniper.net<mailto:zzhang@juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: RE: Some questions regarding Replication SID

Alexander,
Responses to your queries are prefaced with [RP].


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you=
 point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) th=
at represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actua=
lly I wanted to ask whether the SIDs in the list that represent a specific=
 Replication Branch are the SIDs defined in RFC 8204. The text I see in th=
e SR P2MP Policy<https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6H2=
?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-policy-=
00> draft seems to suggest that it is not necessarily so  because a Tree-S=
ID is considered also as the Replication SID. This looks inconsistent to m=
e because a Replication SID as defined in this draft is instantiated both =
in the Replication node and in the Downstream nodes while the Tree-SID doe=
s not require instantiation in the Leaf nodes (this is optional).



2. The draft also says that "A Replication branch to a particular Downstre=
am Node could be represented by the node's Node SID".  Does this mean that=
 the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node =
SID as the active segment across such a replication branch?

[RP] No, Replication SID relevant at a downstream node would be the bottom=
 label with other SIDs stacked on top which would guide the packet to the =
downstream node. Of course, if the Downstream node is adjacent to the Repl=
ication node, only the Replication SID would be present in the outgoing pa=
cket.[[Sasha]] OK, thanks.



3. The draft also says that "Replication segment is instantiated at Downst=
ream nodes and at the Replication node".  Does that mean that the list of =
SIDs associated with the specific replication Branch is pushed by the Repl=
ication Node on top of the label representing the Replication SID in the D=
ownstream node of this branch?

[RP] Yes. See response to 2 above.[[Sasha]] OK, thanks again.



4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

[RP] Since the Replication SID is locally relevant at a node, the Replicat=
ion SID would be downstream-allocated. However, it may also be allocated b=
y PCE; see response to 5, 6 below.[[Sasha]] OK, thanks.



5. The draft also says that  "A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE". These two options look exac=
tly the same to me from the POV of the node on which the Replication segme=
nt is programmed - what, if anything, did I miss?

[RP] You are right in that it does not matter how Replication segment is i=
nstantiated at a node. The use of PCE is relevant for SR P2MP Policy<https=
://clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PC=
E instantiates Replication segments.[[Sasha]] OK, I will  look up the seco=
nd draft. BTW, it does not appear as a reference in this one - is it inten=
tional?



6. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of =
SR is to simplify. The idea is same here - use replication segments to rea=
lize P2MP trees computed by PCE (without need of multicast protocols) as s=
pecified in SR P2MP draft[[Sasha]] One of the well-known aspects that make=
 multicast different is that the traffic in the Service Provider domain is=
 driven by the dynamic customer requests. Handling these requests via a PC=
E looks problematic to me.



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be highly appreciated.

[RP]SR P2MP policy draft lists different protocols (PCEP, BGP, etc.) that =
can be used to instantiate Replication segments. SR P2MP PCEP<https://clic=
ktime.symantec.com/3JuFtE8qkd9Viz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf=
.org%2Fhtml%2Fdraft-dhs-spring-pce-sr-p2mp-policy-00> would be updated; ot=
her drafts will be published in future.


More of the same...
Pleade note that if the anser to #3 in my original message is positive, th=
en the statement in the draft that say the Replication Segment is similar =
to the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the =
Replication segment at Root (or Headend) node can be used as a (constant) =
Binding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and th=
e Replication SID as defined here is that the former is instantiated just =
locally while the Replication SID is instantiated both in the Replication =
node and in the Downstream nodes.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Tuesday, October 15, 2019 6:31 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>; Clarence Filsfils (=
cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; Rishabh Parekh =
(riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.com>>; hooman.bidgoli=
@nokia.com<mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzh=
ang@juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: Some questions regarding Replication SID

Dear colleagues,
I have read the Replication SID draft<https://clicktime.symantec.com/3G11J=
yktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voye=
r-spring-sr-replication-segment-00>, and I have a few questions dealing wi=
th possible instantiation of the Replication SOD in SR-MPLS<https://clickt=
ime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dhttps%3A%2F%2Ftools.ietf.o=
rg%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpls-22>.


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

2. The draft also says that "A Replication branch to a particular Downstre=
am Node could be represented by the node's Node SID".  Does this mean that=
 the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node =
SID as the active segment across such a replication branch?

3. The draft also says that "Replication segment is instantiated at Downst=
ream nodes and at the Replication node".  Does that mean that the list of =
SIDs associated with the specific replication Branch is pushed by the Repl=
ication Node on top of the label representing the Replication SID in the D=
ownstream node of this branch?

4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

5. The draft also says that  "A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE". These two options look exac=
tly the same to me from the POV of the node on which the Replication segme=
nt is programmed - what, if anything, did I miss?

6. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>


__________________________________________________________________________=
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
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delete the original
and all copies thereof.
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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a =
prompt response and apologies for the delays.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please see more </spa=
n><b><i><span style=3D"color:#00B050">inline below</span></i></b><span sty=
le=3D"color:#1F497D">.<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; Al=
exander.Vainshtein@ecitele.com<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;riparekh=
@cisco.com&gt; <br>
<b>Sent:</b> Thursday, October 17, 2019 9:38 PM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;<b=
r>
<b>Cc:</b> spring@ietf.org; Clarence Filsfils (cfilsfil) &lt;cfilsfil@cisc=
o.com&gt;; hooman.bidgoli@nokia.com; zzhang@juniper.net; daniel.voyer@bell=
.ca<br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Sash=
a,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that &#=
8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;=
Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, Dow=
nstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that the=
 </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Cour=
ier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of <a href=3D"https:=
//clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftool=
s.ietf.org%2Fhtml%2Frfc8402">RFC8402</a>?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID not a topological SID as defined the sections you point to in =
RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that represents=
 the Replication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </=
span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the =
process of writing. Actually I wanted to ask whether the SIDs in the list =
that represent a specific Replication Branch are the SIDs defined in RFC 8=
204. The text I see in the </span></i></b><b><i><span style=3D"font-size:1=
1.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><a href=3D=
"https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F=
%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-policy-00">SR P2MP Poli=
cy</a> </span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#00B0F0">draft seems to suggest that it=
 is not necessarily so &nbsp;because a Tree-SID is considered also as the =
Replication SID. This looks inconsistent to me because a Replication SID a=
s defined in this draft is instantiated both in the Replication node and i=
n the Downstream nodes while the Tree-SID does not require instantiation i=
n the Leaf nodes (this is optional). </span></i></b><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p><=
/o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
I am not sure I completely understand your questions above. Let&#8217;s br=
eak them down and see if my responses clarify them:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">Actually I want=
ed to ask whether the SIDs in the list that represent a specific Replicati=
on Branch are the SIDs defined in RFC 8204</span></i></b><span style=3D"fo=
nt-size:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
 I think my responses to questions 2 and 3 in your original e-mail should =
make this clear. Let me know if it is not.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">The text I see =
in the </span>
<span style=3D"color:#1F497D"><a href=3D"https://clicktime.symantec.com/3K=
YcTh6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-v=
oyer-pim-sr-p2mp-policy-00">SR P2MP Policy</a>
</span><span style=3D"color:#00B0F0">draft seems to suggest that it is not=
 necessarily so &nbsp;because a Tree-SID is considered also as the Replica=
tion SID.</span></i></b><span style=3D"font-size:10.0pt;color:#1F497D"><o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
SR P2MP Policy draft specifies a way to create P2MP trees by stitching Rep=
lication Segments together. The Replication SID of the Replication segment=
 at root of a tree is called Tree-SID since
 this SID allows packets to be replicated across the tree.<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">This looks inco=
nsistent to me because a Replication SID as defined in this draft is insta=
ntiated both in the Replication node and in the Downstream nodes while the=
 Tree-SID does not require instantiation
 in the Leaf nodes (this is optional).</span></i></b><span style=3D"font-s=
ize:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
Replication segment draft describes how a *<b>single</b>* Replication segm=
ent can be used for a Multi-point service. In that case, the Replication S=
ID at downstream nodes (which are the Leaf
 nodes of the service) is used to derive service context. The P2MP policy =
draft&nbsp; makes Replication segments at Leaf nodes OPTIONAL when it is p=
ossible to derive service context from some other information in the packe=
t. Thinking more about this, even for the
 single Replication segment, it might be possible to avoid instantiation a=
t Downstream nodes when service context can be derived from some other inf=
ormation in the packet. We might consider this for next revision.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B050">[[Sasha]] I am =
confused now. From my POV either the Replication SID MUST be represented b=
oth in the Replication node and in all Downstream nodes, or it MUST be loc=
al for the Replication Node only. In the
 first case its handling effectively is CONTINUE in each Replication Branc=
h, in the second case it is NEXT in each Replication Branch. I do not see =
how you can have two different kinds of handling for the same type of SID.=

</span></i></b><span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are =
right in that it does not matter how Replication segment is instantiated a=
t a node. The use of PCE is relevant for <a href=3D"https://clicktime.syma=
ntec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%=
2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F">SR P2MP Policy</a> draft where =
PCE instantiates Replication segments<span style=3D"color:#00B0F0">.<b><i>=
[[Sasha]] OK, I will &nbsp;look up the second draft. BTW, it does not appe=
ar as a reference in this one &#8211; is it intentional?</i></b> <o:p></o:=
p></span></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
The P2MP policy draft uses Replication segment draft as a base, but it is =
not the other way around. We can add a Informative reference in next revis=
ion if you think it will help</span><span style=3D"font-size:10.0pt;color:=
#00B050">.<b><i>[[Sasha]]
 It would help IMHO.</i></b></span><span style=3D"font-size:10.0pt;color:#=
1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l2 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do =
not strictly preclude any protocol , but one of the goals of SR is to simp=
lify. The idea is same here - use replication segments to realize P2MP tre=
es computed by PCE (without need of multicast protocols) as specified in S=
R P2MP draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-=
known aspects that make multicast different is that the traffic in the Ser=
vice Provider domain is driven by the dynamic customer requests. Handling =
these requests via a PCE looks problematic to me. </span></i></b><span sty=
le=3D"color:#00B0F0"><o:p></o:p></span></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
<a href=3D"https://clicktime.symantec.com/329erDXYCoUNudUpd4NoApR6H2?u=3Dh=
ttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-parekh-bess-mvpn-sr-p2mp%2=
F">SR P2MP MVPN</a> draft,&nbsp; which will be updated
 soon, specifies procedures for dynamic updates SR P2MP trees using BGP MV=
PN; this includes dampening procedures to control interaction between PCC =
(root of tree) and PCE.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B050">[[Sasha]] I wil=
l look up this draft as well.
</span></i></b><span style=3D"color:#00B050"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">Pleade note that if the anser to #3 in my original message is positi=
ve, then the statement in the draft that say the Replication Segment is si=
milar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">[RP] Since Replication SID is local to a Node, the Replication SID o=
f the Replication segment at Root (or Headend) node can be used as a (cons=
tant) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"col=
or:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in=
 8204 and the Replication SID as defined here is that the former is instan=
tiated just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream no=
des.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
Here we use &#8220;Binding SID&#8221; to denote that fact that Replication=
 SID (or Tree-SID for P2MP trees) at the Root MAY be used as a constant SI=
D that allows packets to be steered into a Replication
 segment or a P2MP tree. Note the drafts do not exclude the possibility th=
at Replication SIDs at downstream nodes or non-Root Replication segments c=
an change</span><span style=3D"font-size:10.0pt;color:#00B050">.<b><i>[[Sa=
sha]] Please see above.
</i></b>&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#00B050"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Ris=
habh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Wednesday, October 16, 2019 10:26 PM<br>
<b>To:</b> Rishabh Parekh (riparekh) &lt;<a href=3D"mailto:riparekh@cisco.=
com">riparekh@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Clarenc=
e Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@c=
isco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a>; <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voy=
er@bell.ca</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Re-sending with corre=
cted To and CC lists...<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </=
span><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainsht=
ein@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein <br>
<b>Sent:</b> Thursday, October 17, 2019 8:25 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a=
><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Rishabh=
 Parekh (riparekh) &lt;<a href=3D"mailto:riparekh@cisco.com">riparekh@cisc=
o.com</a>&gt;; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil=
@cisco.com">cfilsfil@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a =
prompt and detailed response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please see more </spa=
n><b><i><span style=3D"color:#00B0F0">inline below</span></i></b><span sty=
le=3D"color:#1F497D">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </=
span><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainsht=
ein@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;<a href=3D=
"mailto:riparekh@cisco.com">riparekh@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 1:24 AM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a>; Clarence=
 Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@ci=
sco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Resp=
onses to your queries are prefaced with [RP].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that &#=
8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;=
Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, Dow=
nstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that the=
 </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Cour=
ier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of </span><a href=3D=
"https://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F=
%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">RFC8402</span></a><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">?<o:p></o:p></sp=
an></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID not a topological SID as defined the sections you point to in =
RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that represents=
 the Replication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </=
span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the =
process of writing. Actually I wanted to ask whether the SIDs in the list =
that represent a specific Replication Branch are the SIDs defined in RFC 8=
204. The text I see in the </span></i></b><a href=3D"https://clicktime.sym=
antec.com/3KYcTh6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fht=
ml%2Fdraft-voyer-pim-sr-p2mp-policy-00"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span></i><=
/b></a><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quo=
t;,sans-serif;color:#1F497D"> </span></i></b><b><i><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B0F0">draft s=
eems to suggest that it is not necessarily so &nbsp;because a Tree-SID is =
considered also as the Replication SID. This looks inconsistent to me beca=
use a Replication SID as defined in this draft is instantiated both in the=
 Replication node and in the Downstream nodes while the Tree-SID does not =
require instantiation in the Leaf nodes (this is optional). </span></i></b=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f;color:#1F497D"><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at</span> &#8220;<span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">A Replication branch to a particular Downstream No=
de could be represented by the node's Node </span><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">SID</span=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f">&#8221;. &nbsp;Does this mean that the Replication Node sends the packe=
ts it receives with the Replication SID as the active segment with the lab=
els representing the downstream Node SID as the active segment across such=
 a replication branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID relevant at a downstream node would be the bottom label with o=
ther SIDs stacked on top which would guide the packet to the downstream no=
de. Of course, if the Downstream node is adjacent to the Replication node,=
 only the Replication SID would be present in the outgoing packet<span sty=
le=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, thanks</i></b></span><b><i><span=
 style=3D"color:#1F497D">. </span></i></b><span style=3D"color:#1F497D">&n=
bsp;</span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">Replication segment is instantiated at Downstream =
nodes and at=20the Replication node</span><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean =
that the list of SIDs associated with the specific replication Branch is p=
ushed by the Replication Node on top of the label representing the Replica=
tion SID in the Downstream node of this branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Yes. See=
 response to 2 above<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, tha=
nks again.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo6"><![if !supportLists]><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-=
list:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </s=
pan></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Are the labels that=
 represent the Replication SID at the Downstream nodes downstream-allocate=
d by these nodes or upstream-allocated by the replication node?</span><spa=
n lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot=
;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Since th=
e Replication SID is locally relevant at a node, the Replication SID would=
 be downstream-allocated. However, it may also be allocated by PCE; see re=
sponse to 5, 6 below<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, tha=
nks.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span lang=3D"E=
N" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;"><o:p>&nb=
sp;</o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &nbsp;&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-fa=
mily:&quot;Courier New&quot;">A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE</span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">&#8221;. These two op=
tions look exactly the same to me from the POV of the node on which the Re=
plication segment is programmed - what, if anything, did I miss?<o:p></o:p=
></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are =
right in that it does not matter how Replication segment is instantiated a=
t a node. The use of PCE is relevant for </span><a href=3D"https://clickti=
me.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ie=
tf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F"><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span><=
/a><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-se=
rif"> draft where PCE instantiates Replication segments<span style=3D"colo=
r:#00B0F0">.<b><i>[[Sasha]] OK, I will &nbsp;look up the second draft. BTW=
, it does not appear as a reference in this one &#8211; is it intentional?=
</i></b> <o:p></o:p></span></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do =
not strictly preclude any protocol , but one of the goals of SR is to simp=
lify. The idea is same here - use replication segments to realize P2MP tre=
es computed by PCE (without need of multicast protocols) as specified in S=
R P2MP draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-=
known aspects that make multicast different is that the traffic in the Ser=
vice Provider domain is driven by the dynamic customer requests. Handling =
these requests via a PCE looks problematic to me. </span></i></b><span sty=
le=3D"color:#00B0F0"><o:p></o:p></span></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiat=
ion of the Replication Segment in SR-MPLS would be highly appreciated.<o:p=
></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">[RP]SR P2MP policy draft lists d=
ifferent protocols (PCEP, BGP, etc.) that can be used to instantiate Repli=
cation segments. </span><a href=3D"https://clicktime.symantec.com/3JuFtE8q=
kd9Viz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-dhs-spr=
ing-pce-sr-p2mp-policy-00"><span style=3D"font-size:11.0pt;font-family:&qu=
ot;Calibri&quot;,sans-serif">SR P2MP PCEP</span></a><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> would be updated; o=
ther drafts will be published in future.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">More of the same...<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">Pleade note that if the anser to #3 in my original message is positi=
ve, then the statement in the draft that say the Replication Segment is si=
milar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">[RP] Since Replication SID is local to a Node, the Replication SID o=
f the Replication segment at Root (or Headend) node can be used as a (cons=
tant) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"col=
or:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in=
 8204 and the Replication SID as defined here is that the former is instan=
tiated just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream no=
des.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Ris=
habh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 6:31 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a=
>; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">=
cfilsfil@cisco.com</a>&gt;; Rishabh Parekh (riparekh) &lt;<a href=3D"mailt=
o:riparekh@cisco.com">riparekh@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear colleagues,<o:p></o:p></p>
<p class=3D"MsoNormal">I have read the <a href=3D"https://clicktime.symant=
ec.com/3G11JyktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%=
2Fdraft-voyer-spring-sr-replication-segment-00">
Replication SID draft</a>, and I have a few questions dealing with possibl=
e instantiation of the Replication SOD in
<a href=3D"https://clicktime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dh=
ttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpl=
s-22">
SR-MPLS</a>.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that &#=
8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;=
Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, Dow=
nstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that the=
 </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Cour=
ier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of </span><a href=3D=
"https://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F=
%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">RFC8402</span></a><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">? <o:p></o:p></s=
pan></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at</span> &#8220;<span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">A Replication branch to a particular Downstream No=
de could be represented by the node's Node </span><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">SID</span=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f">&#8221;. &nbsp;Does this mean that the Replication Node sends the packe=
ts it receives with the Replication SID as the active segment with the lab=
els representing the downstream Node SID as the active segment across such=
 a replication branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">Replication segment is instantiated at Downstream =
nodes and at the Replication node</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean th=
at the list of SIDs associated with the specific replication Branch is pus=
hed by the Replication Node on top of the label representing the Replicati=
on SID in the Downstream node of this branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-=
list:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </s=
pan></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Are the labels that=
 represent the Replication SID at the Downstream nodes downstream-allocate=
d by these nodes or upstream-allocated=20by the replication node? </span><=
span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&q=
uot;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &nbsp;&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-fa=
mily:&quot;Courier New&quot;">A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE</span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">&#8221;. These two op=
tions look exactly the same to me from the POV of the node on which the Re=
plication segment is programmed - what, if anything, did I miss?<o:p></o:p=
></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiat=
ion of the Replication Segment in SR-MPLS would be highly appreciated.<o:p=
></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><br>
__________________________________________________________________________=
_<br>
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This e-mail message is intended for the recipient only and contains inform=
ation which is
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__________________________________________________________________________=
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This e-mail message is intended for the recipient only and contains inform=
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This e-mail message is intended for the recipient only and contains inform=
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From: "Rishabh Parekh (riparekh)" <riparekh@cisco.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
CC: "spring@ietf.org" <spring@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "zzhang@juniper.net" <zzhang@juniper.net>, "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>
Thread-Topic: Some questions regarding Replication SID
Thread-Index: AdWDVOyBSqV6o0PFS+K0ByGygF/1pwBGnOBgAA4SwmAAAOQ1MAAZqO6wAPSH8iAABdmwYA==
Date: Tue, 22 Oct 2019 17:25:09 +0000
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Subject: Re: [spring] Some questions regarding Replication SID
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Sasha,

This looks inconsistent to me because a Replication SID as defined in this =
draft is instantiated both in the Replication node and in the Downstream no=
des while the Tree-SID does not require instantiation in the Leaf nodes (th=
is is optional).
[RP]Replication segment draft describes how a *single* Replication segment =
can be used for a Multi-point service. In that case, the Replication SID at=
 downstream nodes (which are the Leaf nodes of the service) is used to deri=
ve service context. The P2MP policy draft  makes Replication segments at Le=
af nodes OPTIONAL when it is possible to derive service context from some o=
ther information in the packet. Thinking more about this, even for the sing=
le Replication segment, it might be possible to avoid instantiation at Down=
stream nodes when service context can be derived from some other informatio=
n in the packet. We might consider this for next revision.
[[Sasha]] I am confused now. From my POV either the Replication SID MUST be=
 represented both in the Replication node and in all Downstream nodes, or i=
t MUST be local for the Replication Node only. In the first case its handli=
ng effectively is CONTINUE in each Replication Branch, in the second case i=
t is NEXT in each Replication Branch. I do not see how you can have two dif=
ferent kinds of handling for the same type of SID.

I definitely did not intend to confuse you! Sometimes such discussion can g=
et quite esoteric and written word (as compared to say whiteboard diagram) =
is not the best medium, but let me try to clarify. If you wish, we can sche=
dule a conference call to discuss further.

Typically, for any multicast transport, it is not possible to carry a downs=
tream assigned service context (VPN label) in the label stack (since it is =
difficult to orchestrate all the Leaf nodes to assign same value for the co=
ntext). So, the transport label (Replication SID) is used to derive the ser=
vice context. This requires Replication SID to be instantiated on the Leaf =
nodes and as you say, the Replication node performs CONTINUE operation. How=
ever, if the service context can be assigned globally (for e.g. DCB from ht=
tps://tools.ietf.org/html/draft-ietf-bess-mvpn-evpn-aggregation-label-02), =
then Replication SID is not strictly required at Leaf nodes and therefore R=
eplication node can perform NEXT operation. Some of these details are cover=
ed in Section 2.1 of the P2MP policy draft.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Sent: Tuesday, October 22, 2019 7:30 AM
To: Rishabh Parekh (riparekh) <riparekh@cisco.com>
Cc: spring@ietf.org; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com>; hoo=
man.bidgoli@nokia.com; zzhang@juniper.net; daniel.voyer@bell.ca
Subject: RE: Some questions regarding Replication SID


Rishabh,
Lots of thanks for a prompt response and apologies for the delays.

Please see more inline below.
Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecite=
le.com>

From: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.c=
om>>
Sent: Thursday, October 17, 2019 9:38 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexander=
.Vainshtein@ecitele.com>>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Clarence Filsfils (cfilsfil) <=
cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<ma=
ilto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper.ne=
t>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Subject: RE: Some questions regarding Replication SID

Sasha,


1. The draft says that "each branch is abstracted to a <Downstream Node, Do=
wnstream Replication-SID>".  Does that mean that the Downstream Replication=
-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https://=
clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.i=
etf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you =
point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that=
 represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actual=
ly I wanted to ask whether the SIDs in the list that represent a specific R=
eplication Branch are the SIDs defined in RFC 8204. The text I see in the S=
R P2MP Policy<https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6H2?u=
=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-policy-00>=
 draft seems to suggest that it is not necessarily so  because a Tree-SID i=
s considered also as the Replication SID. This looks inconsistent to me bec=
ause a Replication SID as defined in this draft is instantiated both in the=
 Replication node and in the Downstream nodes while the Tree-SID does not r=
equire instantiation in the Leaf nodes (this is optional).

[RP]I am not sure I completely understand your questions above. Let's break=
 them down and see if my responses clarify them:
Actually I wanted to ask whether the SIDs in the list that represent a spec=
ific Replication Branch are the SIDs defined in RFC 8204
[RP] I think my responses to questions 2 and 3 in your original e-mail shou=
ld make this clear. Let me know if it is not.

The text I see in the SR P2MP Policy<https://clicktime.symantec.com/3KYcTh6=
w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-p=
im-sr-p2mp-policy-00> draft seems to suggest that it is not necessarily so =
 because a Tree-SID is considered also as the Replication SID.
[RP]SR P2MP Policy draft specifies a way to create P2MP trees by stitching =
Replication Segments together. The Replication SID of the Replication segme=
nt at root of a tree is called Tree-SID since this SID allows packets to be=
 replicated across the tree.

This looks inconsistent to me because a Replication SID as defined in this =
draft is instantiated both in the Replication node and in the Downstream no=
des while the Tree-SID does not require instantiation in the Leaf nodes (th=
is is optional).
[RP]Replication segment draft describes how a *single* Replication segment =
can be used for a Multi-point service. In that case, the Replication SID at=
 downstream nodes (which are the Leaf nodes of the service) is used to deri=
ve service context. The P2MP policy draft  makes Replication segments at Le=
af nodes OPTIONAL when it is possible to derive service context from some o=
ther information in the packet. Thinking more about this, even for the sing=
le Replication segment, it might be possible to avoid instantiation at Down=
stream nodes when service context can be derived from some other informatio=
n in the packet. We might consider this for next revision.
[[Sasha]] I am confused now. From my POV either the Replication SID MUST be=
 represented both in the Replication node and in all Downstream nodes, or i=
t MUST be local for the Replication Node only. In the first case its handli=
ng effectively is CONTINUE in each Replication Branch, in the second case i=
t is NEXT in each Replication Branch. I do not see how you can have two dif=
ferent kinds of handling for the same type of SID.



[RP] You are right in that it does not matter how Replication segment is in=
stantiated at a node. The use of PCE is relevant for SR P2MP Policy<https:/=
/clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatra=
cker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PCE in=
stantiates Replication segments.[[Sasha]] OK, I will  look up the second dr=
aft. BTW, it does not appear as a reference in this one - is it intentional=
?
[RP]The P2MP policy draft uses Replication segment draft as a base, but it =
is not the other way around. We can add a Informative reference in next rev=
ision if you think it will help.[[Sasha]] It would help IMHO.


1. Did you consider a possibility of advertising the Replication Segment fr=
om the Downstream nodes to the Replication one using some multicast routing=
 protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a pos=
sibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of S=
R is to simplify. The idea is same here - use replication segments to reali=
ze P2MP trees computed by PCE (without need of multicast protocols) as spec=
ified in SR P2MP draft[[Sasha]] One of the well-known aspects that make mul=
ticast different is that the traffic in the Service Provider domain is driv=
en by the dynamic customer requests. Handling these requests via a PCE look=
s problematic to me.
[RP]SR P2MP MVPN<https://clicktime.symantec.com/329erDXYCoUNudUpd4NoApR6H2?=
u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-parekh-bess-mvpn-sr-p2=
mp%2F> draft,  which will be updated soon, specifies procedures for dynamic=
 updates SR P2MP trees using BGP MVPN; this includes dampening procedures t=
o control interaction between PCC (root of tree) and PCE.
[[Sasha]] I will look up this draft as well.

Pleade note that if the anser to #3 in my original message is positive, the=
n the statement in the draft that say the Replication Segment is similar to=
 the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the R=
eplication segment at Root (or Headend) node can be used as a (constant) Bi=
nding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and the=
 Replication SID as defined here is that the former is instantiated just lo=
cally while the Replication SID is instantiated both in the Replication nod=
e and in the Downstream nodes.
[RP]Here we use "Binding SID" to denote that fact that Replication SID (or =
Tree-SID for P2MP trees) at the Root MAY be used as a constant SID that all=
ows packets to be steered into a Replication segment or a P2MP tree. Note t=
he drafts do not exclude the possibility that Replication SIDs at downstrea=
m nodes or non-Root Replication segments can change.[[Sasha]] Please see ab=
ove.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexand=
er.Vainshtein@ecitele.com>>
Sent: Wednesday, October 16, 2019 10:26 PM
To: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.com=
>>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Clarence Filsfils (cfilsfil) <=
cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<ma=
ilto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper.ne=
t>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Subject: RE: Some questions regarding Replication SID

Re-sending with corrected To and CC lists...

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecite=
le.com>

From: Alexander Vainshtein
Sent: Thursday, October 17, 2019 8:25 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Rishabh Parekh (riparekh) <rip=
arekh@cisco.com<mailto:riparekh@cisco.com>>; Clarence Filsfils (cfilsfil) <=
cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<ma=
ilto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper.ne=
t>
Subject: RE: Some questions regarding Replication SID

Rishabh,
Lots of thanks for a prompt and detailed response.

Please see more inline below.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecite=
le.com>

From: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.c=
om>>
Sent: Thursday, October 17, 2019 1:24 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexander=
.Vainshtein@ecitele.com>>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca=
>; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisco.c=
om>>; hooman.bidgoli@nokia.com<mailto:hooman.bidgoli@nokia.com>; zzhang@jun=
iper.net<mailto:zzhang@juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: RE: Some questions regarding Replication SID

Alexander,
Responses to your queries are prefaced with [RP].


1. The draft says that "each branch is abstracted to a <Downstream Node, Do=
wnstream Replication-SID>".  Does that mean that the Downstream Replication=
-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https://=
clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.i=
etf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you =
point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that=
 represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actual=
ly I wanted to ask whether the SIDs in the list that represent a specific R=
eplication Branch are the SIDs defined in RFC 8204. The text I see in the S=
R P2MP Policy<https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6H2?u=
=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-policy-00>=
 draft seems to suggest that it is not necessarily so  because a Tree-SID i=
s considered also as the Replication SID. This looks inconsistent to me bec=
ause a Replication SID as defined in this draft is instantiated both in the=
 Replication node and in the Downstream nodes while the Tree-SID does not r=
equire instantiation in the Leaf nodes (this is optional).



2. The draft also says that "A Replication branch to a particular Downstrea=
m Node could be represented by the node's Node SID".  Does this mean that t=
he Replication Node sends the packets it receives with the Replication SID =
as the active segment with the labels representing the downstream Node SID =
as the active segment across such a replication branch?

[RP] No, Replication SID relevant at a downstream node would be the bottom =
label with other SIDs stacked on top which would guide the packet to the do=
wnstream node. Of course, if the Downstream node is adjacent to the Replica=
tion node, only the Replication SID would be present in the outgoing packet=
.[[Sasha]] OK, thanks.



3. The draft also says that "Replication segment is instantiated at Downstr=
eam nodes and at the Replication node".  Does that mean that the list of SI=
Ds associated with the specific replication Branch is pushed by the Replica=
tion Node on top of the label representing the Replication SID in the Downs=
tream node of this branch?

[RP] Yes. See response to 2 above.[[Sasha]] OK, thanks again.



4. Are the labels that represent the Replication SID at the Downstream node=
s downstream-allocated by these nodes or upstream-allocated by the replicat=
ion node?

[RP] Since the Replication SID is locally relevant at a node, the Replicati=
on SID would be downstream-allocated. However, it may also be allocated by =
PCE; see response to 5, 6 below.[[Sasha]] OK, thanks.



5. The draft also says that  "A Replication segment can be either provision=
ed locally on a node or programmed by a PCE". These two options look exactl=
y the same to me from the POV of the node on which the Replication segment =
is programmed - what, if anything, did I miss?

[RP] You are right in that it does not matter how Replication segment is in=
stantiated at a node. The use of PCE is relevant for SR P2MP Policy<https:/=
/clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatra=
cker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PCE in=
stantiates Replication segments.[[Sasha]] OK, I will  look up the second dr=
aft. BTW, it does not appear as a reference in this one - is it intentional=
?



6. Did you consider a possibility of advertising the Replication Segment fr=
om the Downstream nodes to the Replication one using some multicast routing=
 protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a pos=
sibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of S=
R is to simplify. The idea is same here - use replication segments to reali=
ze P2MP trees computed by PCE (without need of multicast protocols) as spec=
ified in SR P2MP draft[[Sasha]] One of the well-known aspects that make mul=
ticast different is that the traffic in the Service Provider domain is driv=
en by the dynamic customer requests. Handling these requests via a PCE look=
s problematic to me.



Any details regarding instantiation of the Replication Segment in SR-MPLS w=
ould be highly appreciated.

[RP]SR P2MP policy draft lists different protocols (PCEP, BGP, etc.) that c=
an be used to instantiate Replication segments. SR P2MP PCEP<https://clickt=
ime.symantec.com/3JuFtE8qkd9Viz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf.or=
g%2Fhtml%2Fdraft-dhs-spring-pce-sr-p2mp-policy-00> would be updated; other =
drafts will be published in future.


More of the same...
Pleade note that if the anser to #3 in my original message is positive, the=
n the statement in the draft that say the Replication Segment is similar to=
 the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the R=
eplication segment at Root (or Headend) node can be used as a (constant) Bi=
nding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and the=
 Replication SID as defined here is that the former is instantiated just lo=
cally while the Replication SID is instantiated both in the Replication nod=
e and in the Downstream nodes.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexand=
er.Vainshtein@ecitele.com>>
Sent: Tuesday, October 15, 2019 6:31 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>; Clarence Filsfils (c=
filsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; Rishabh Parekh (r=
iparekh) <riparekh@cisco.com<mailto:riparekh@cisco.com>>; hooman.bidgoli@no=
kia.com<mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@=
juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: Some questions regarding Replication SID

Dear colleagues,
I have read the Replication SID draft<https://clicktime.symantec.com/3G11Jy=
ktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-=
spring-sr-replication-segment-00>, and I have a few questions dealing with =
possible instantiation of the Replication SOD in SR-MPLS<https://clicktime.=
symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2F=
html%2Fdraft-ietf-spring-segment-routing-mpls-22>.


1. The draft says that "each branch is abstracted to a <Downstream Node, Do=
wnstream Replication-SID>".  Does that mean that the Downstream Replication=
-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https://=
clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.i=
etf.org%2Fhtml%2Frfc8402>?

2. The draft also says that "A Replication branch to a particular Downstrea=
m Node could be represented by the node's Node SID".  Does this mean that t=
he Replication Node sends the packets it receives with the Replication SID =
as the active segment with the labels representing the downstream Node SID =
as the active segment across such a replication branch?

3. The draft also says that "Replication segment is instantiated at Downstr=
eam nodes and at the Replication node".  Does that mean that the list of SI=
Ds associated with the specific replication Branch is pushed by the Replica=
tion Node on top of the label representing the Replication SID in the Downs=
tream node of this branch?

4. Are the labels that represent the Replication SID at the Downstream node=
s downstream-allocated by these nodes or upstream-allocated by the replicat=
ion node?

5. The draft also says that  "A Replication segment can be either provision=
ed locally on a node or programmed by a PCE". These two options look exactl=
y the same to me from the POV of the node on which the Replication segment =
is programmed - what, if anything, did I miss?

6. Did you consider a possibility of advertising the Replication Segment fr=
om the Downstream nodes to the Replication one using some multicast routing=
 protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a pos=
sibility strictly precluded?



Any details regarding instantiation of the Replication Segment in SR-MPLS w=
ould be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecite=
le.com>


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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Sasha=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">This looks incon=
sistent to me because a Replication SID as defined in this draft is instant=
iated both in the Replication node and in the Downstream nodes while the Tr=
ee-SID does not require instantiation
 in the Leaf nodes (this is optional).</span></i></b><span style=3D"font-si=
ze:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]R=
eplication segment draft describes how a *<b>single</b>* Replication segmen=
t can be used for a Multi-point service. In that case, the Replication SID =
at downstream nodes (which are the Leaf
 nodes of the service) is used to derive service context. The P2MP policy d=
raft&nbsp; makes Replication segments at Leaf nodes OPTIONAL when it is pos=
sible to derive service context from some other information in the packet. =
Thinking more about this, even for the
 single Replication segment, it might be possible to avoid instantiation at=
 Downstream nodes when service context can be derived from some other infor=
mation in the packet. We might consider this for next revision.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B050">[[Sasha]] I am c=
onfused now. From my POV either the Replication SID MUST be represented bot=
h in the Replication node and in all Downstream nodes, or it MUST be local =
for the Replication Node only. In the
 first case its handling effectively is CONTINUE in each Replication Branch=
, in the second case it is NEXT in each Replication Branch. I do not see ho=
w you can have two different kinds of handling for the same type of SID.
</span></i></b><span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">I def=
initely did not intend to confuse you! Sometimes such discussion can get qu=
ite esoteric and written word (as compared to say whiteboard diagram) is no=
t the best medium, but let me try to
 clarify. If you wish, we can schedule a conference call to discuss further=
.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Typic=
ally, for any multicast transport, it is not possible to carry a downstream=
 assigned service context (VPN label) in the label stack (since it is diffi=
cult to orchestrate all the Leaf nodes
 to assign same value for the context). So, the transport label (Replicatio=
n SID) is used to derive the service context. This requires Replication SID=
 to be instantiated on the Leaf nodes and as you say, the Replication node =
performs CONTINUE operation. However,
 if the service context can be assigned globally (for e.g. DCB from <a href=
=3D"https://tools.ietf.org/html/draft-ietf-bess-mvpn-evpn-aggregation-label=
-02">
https://tools.ietf.org/html/draft-ietf-bess-mvpn-evpn-aggregation-label-02<=
/a>), then Replication SID is not strictly required at Leaf nodes and there=
fore Replication node can perform NEXT operation. Some of these details are=
 covered in Section 2.1 of the P2MP
 policy draft.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Rish=
abh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;Alexander.Vain=
shtein@ecitele.com&gt;
<br>
<b>Sent:</b> Tuesday, October 22, 2019 7:30 AM<br>
<b>To:</b> Rishabh Parekh (riparekh) &lt;riparekh@cisco.com&gt;<br>
<b>Cc:</b> spring@ietf.org; Clarence Filsfils (cfilsfil) &lt;cfilsfil@cisco=
.com&gt;; hooman.bidgoli@nokia.com; zzhang@juniper.net; daniel.voyer@bell.c=
a<br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a p=
rompt response and apologies for the delays.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please see more </span=
><b><i><span style=3D"color:#00B050">inline below</span></i></b><span style=
=3D"color:#1F497D">.<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-39266=
302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </s=
pan><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtei=
n@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;<a href=
=3D"mailto:riparekh@cisco.com">riparekh@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 9:38 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Clarence=
 Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@cis=
co.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; <=
a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a>; <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voye=
r@bell.ca</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Sasha=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l1 level1 lfo2"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft says that &#8220;</span><span lang=3D"EN" sty=
le=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">each branch is =
abstracted to a &lt;Downstream Node, Downstream Replication-SID&gt;</span><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">=
&#8221;. &nbsp;Does that mean that the </span><span lang=3D"EN" style=3D"fo=
nt-size:12.0pt;font-family:&quot;Courier New&quot;">Downstream Replication-=
SID</span><span lang=3D"EN" style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif"> </span><span style=3D"font-size:11.0pt;font-family:=
&quot;Calibri&quot;,sans-serif">is one of the SIDs defined in Sections 3, 4=
 and 5&nbsp; of </span><a href=3D"https://clicktime.symantec.com/3XUuhGHPMp=
ikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span s=
tyle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">RFC840=
2</span></a><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;=
,sans-serif">?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Replicat=
ion SID not a topological SID as defined the sections you point to in RFC 8=
402. Instead, it is a separate SID (label in SR-MPLS) that represents the R=
eplication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.0=
pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </sp=
an></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&=
quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the proc=
ess of writing. Actually I wanted to ask whether the SIDs in the list that =
represent a specific Replication Branch are the SIDs defined in RFC 8204. T=
he text I see in the </span></i></b><a href=3D"https://clicktime.symantec.c=
om/3KYcTh6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdra=
ft-voyer-pim-sr-p2mp-policy-00"><b><i><span style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span></i></b></a><b>=
<i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-ser=
if;color:#1F497D"> </span></i></b><b><i><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif;color:#00B0F0">draft seems to sugge=
st that it is not necessarily so &nbsp;because a Tree-SID is considered als=
o as the Replication SID. This looks inconsistent to me because a Replicati=
on SID as defined in this draft is instantiated both in the Replication nod=
e and in the Downstream nodes while the Tree-SID does not require instantia=
tion in the Leaf nodes (this is optional). </span></i></b><span style=3D"fo=
nt-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o=
:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]I=
 am not sure I completely understand your questions above. Let&#8217;s brea=
k them down and see if my responses clarify them:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">Actually I wante=
d to ask whether the SIDs in the list that represent a specific Replication=
 Branch are the SIDs defined in RFC 8204</span></i></b><span style=3D"font-=
size:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP] =
I think my responses to questions 2 and 3 in your original e-mail should ma=
ke this clear. Let me know if it is not.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">The text I see i=
n the </span>
</i></b><a href=3D"https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6H=
2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-policy-=
00"><b><i>SR P2MP Policy</i></b></a><b><i><span style=3D"color:#1F497D">
</span><span style=3D"color:#00B0F0">draft seems to suggest that it is not =
necessarily so &nbsp;because a Tree-SID is considered also as the Replicati=
on SID.</span></i></b><span style=3D"font-size:10.0pt;color:#1F497D"><o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]S=
R P2MP Policy draft specifies a way to create P2MP trees by stitching Repli=
cation Segments together. The Replication SID of the Replication segment at=
 root of a tree is called Tree-SID since
 this SID allows packets to be replicated across the tree.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">This looks incon=
sistent to me because a Replication SID as defined in this draft is instant=
iated both in the Replication node and in the Downstream nodes while the Tr=
ee-SID does not require instantiation
 in the Leaf nodes (this is optional).</span></i></b><span style=3D"font-si=
ze:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]R=
eplication segment draft describes how a *<b>single</b>* Replication segmen=
t can be used for a Multi-point service. In that case, the Replication SID =
at downstream nodes (which are the Leaf
 nodes of the service) is used to derive service context. The P2MP policy d=
raft&nbsp; makes Replication segments at Leaf nodes OPTIONAL when it is pos=
sible to derive service context from some other information in the packet. =
Thinking more about this, even for the
 single Replication segment, it might be possible to avoid instantiation at=
 Downstream nodes when service context can be derived from some other infor=
mation in the packet. We might consider this for next revision.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B050">[[Sasha]] I am c=
onfused now. From my POV either the Replication SID MUST be represented bot=
h in the Replication node and in all Downstream nodes, or it MUST be local =
for the Replication Node only. In the
 first case its handling effectively is CONTINUE in each Replication Branch=
, in the second case it is NEXT in each Replication Branch. I do not see ho=
w you can have two different kinds of handling for the same type of SID.
</span></i></b><span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are righ=
t in that it does not matter how Replication segment is instantiated at a n=
ode. The use of PCE is relevant for </span><a href=3D"https://clicktime.sym=
antec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%=
2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F"><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span></a><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> draf=
t where PCE instantiates Replication segments<span style=3D"color:#00B0F0">=
.<b><i>[[Sasha]] OK, I will &nbsp;look up the second draft. BTW, it does no=
t appear as a reference in this one &#8211; is it intentional?</i></b> <o:p=
></o:p></span></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]T=
he P2MP policy draft uses Replication segment draft as a base, but it is no=
t the other way around. We can add a Informative reference in next revision=
 if you think it will help</span><span style=3D"font-size:10.0pt;color:#00B=
050">.<b><i>[[Sasha]]
 It would help IMHO.</i></b></span><span style=3D"font-size:10.0pt;color:#1=
F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l2 level1 lfo4"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">Did you consider a possibility of advertising the Repli=
cation Segment from the Downstream nodes to the Replication one using some =
multicast routing protocol (e.g., creating a SR-MPLS replacement for mLDP)?=
 Or is such a possibility strictly precluded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do not =
strictly preclude any protocol , but one of the goals of SR is to simplify.=
 The idea is same here - use replication segments to realize P2MP trees com=
puted by PCE (without need of multicast protocols) as specified in SR P2MP =
draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-known as=
pects that make multicast different is that the traffic in the Service Prov=
ider domain is driven by the dynamic customer requests. Handling these requ=
ests via a PCE looks problematic to me. </span></i></b><span style=3D"color=
:#00B0F0"><o:p></o:p></span></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]<=
/span><a href=3D"https://clicktime.symantec.com/329erDXYCoUNudUpd4NoApR6H2?=
u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-parekh-bess-mvpn-sr-p2=
mp%2F"><span style=3D"font-size:10.0pt">SR
 P2MP MVPN</span></a><span style=3D"font-size:10.0pt;color:#1F497D"> draft,=
&nbsp; which will be updated soon, specifies procedures for dynamic updates=
 SR P2MP trees using BGP MVPN; this includes dampening procedures to contro=
l interaction between PCC (root of tree)
 and PCE. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B050">[[Sasha]] I will=
 look up this draft as well.
</span></i></b><span style=3D"color:#00B050"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">Pleade note that if the anser to #3 in my original message is positive=
, then the statement in the draft that say the Replication Segment is simil=
ar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">[RP] Since Replication SID is local to a Node, the Replication SID of =
the Replication segment at Root (or Headend) node can be used as a (constan=
t) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"colo=
r:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in 8=
204 and the Replication SID as defined here is that the former is instantia=
ted just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream nod=
es.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]H=
ere we use &#8220;Binding SID&#8221; to denote that fact that Replication S=
ID (or Tree-SID for P2MP trees) at the Root MAY be used as a constant SID t=
hat allows packets to be steered into a Replication
 segment or a P2MP tree. Note the drafts do not exclude the possibility tha=
t Replication SIDs at downstream nodes or non-Root Replication segments can=
 change</span><span style=3D"font-size:10.0pt;color:#00B050">.<b><i>[[Sasha=
]] Please see above.
</i></b>&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#00B050"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Rish=
abh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"mai=
lto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&=
gt;
<br>
<b>Sent:</b> Wednesday, October 16, 2019 10:26 PM<br>
<b>To:</b> Rishabh Parekh (riparekh) &lt;<a href=3D"mailto:riparekh@cisco.c=
om">riparekh@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Clarence=
 Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@cis=
co.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; <=
a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a>; <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voye=
r@bell.ca</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Re-sending with correc=
ted To and CC lists...<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-39266=
302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </s=
pan><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtei=
n@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein <br>
<b>Sent:</b> Thursday, October 17, 2019 8:25 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a>=
<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Rishabh =
Parekh (riparekh) &lt;<a href=3D"mailto:riparekh@cisco.com">riparekh@cisco.=
com</a>&gt;; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@ci=
sco.com">cfilsfil@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; <=
a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a p=
rompt and detailed response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please see more </span=
><b><i><span style=3D"color:#00B0F0">inline below</span></i></b><span style=
=3D"color:#1F497D">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-39266=
302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </s=
pan><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtei=
n@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;<a href=
=3D"mailto:riparekh@cisco.com">riparekh@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 1:24 AM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a>; Clarence =
Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@cisc=
o.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; <=
a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Alexa=
nder,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Respo=
nses to your queries are prefaced with [RP].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft says that &#8220;</span><span lang=3D"EN" sty=
le=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">each branch is =
abstracted to a &lt;Downstream Node, Downstream Replication-SID&gt;</span><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">=
&#8221;. &nbsp;Does that mean that the </span><span lang=3D"EN" style=3D"fo=
nt-size:12.0pt;font-family:&quot;Courier New&quot;">Downstream Replication-=
SID</span><span lang=3D"EN" style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif"> </span><span style=3D"font-size:11.0pt;font-family:=
&quot;Calibri&quot;,sans-serif">is one of the SIDs defined in Sections 3, 4=
 and 5&nbsp; of </span><a href=3D"https://clicktime.symantec.com/3XUuhGHPMp=
ikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span s=
tyle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">RFC840=
2</span></a><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;=
,sans-serif">?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Replicat=
ion SID not a topological SID as defined the sections you point to in RFC 8=
402. Instead, it is a separate SID (label in SR-MPLS) that represents the R=
eplication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.0=
pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </sp=
an></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&=
quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the proc=
ess of writing. Actually I wanted to ask whether the SIDs in the list that =
represent a specific Replication Branch are the SIDs defined in RFC 8204. T=
he text I see in the </span></i></b><a href=3D"https://clicktime.symantec.c=
om/3KYcTh6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdra=
ft-voyer-pim-sr-p2mp-policy-00"><b><i><span style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span></i></b></a><b>=
<i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-ser=
if;color:#1F497D"> </span></i></b><b><i><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif;color:#00B0F0">draft seems to sugge=
st that it is not necessarily so &nbsp;because a Tree-SID is considered als=
o as the Replication SID. This looks inconsistent to me because a Replicati=
on SID as defined in this draft is instantiated both in the Replication nod=
e and in the Downstream nodes while the Tree-SID does not require instantia=
tion in the Leaf nodes (this is optional). </span></i></b><span style=3D"fo=
nt-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o=
:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that</span> &#8220;<span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Replicat=
ion branch to a particular Downstream Node could be represented by the node=
's Node </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quo=
t;Times New Roman&quot;,serif">SID</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does this mean tha=
t the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node S=
ID as the active segment across such a replication branch?<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Replicat=
ion SID relevant at a downstream node would be the bottom label with other =
SIDs stacked on top which would guide the packet to the downstream node. Of=
 course, if the Downstream node is adjacent to the Replication node, only t=
he Replication SID would be present in the outgoing packet<span style=3D"co=
lor:#00B0F0">.<b><i>[[Sasha]] OK, thanks</i></b></span><b><i><span style=3D=
"color:#1F497D">. </span></i></b><span style=3D"color:#1F497D">&nbsp;</span=
><o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &#8220;</span><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">Replicatio=
n segment is instantiated at Downstream nodes and at the Replication node</=
span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">&#8221;. &nbsp;Does that mean that the list of SIDs associated with t=
he specific replication Branch is pushed by the Replication Node on top of =
the label representing the Replication SID in the Downstream node of this b=
ranch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Yes. See res=
ponse to 2 above<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, thanks a=
gain.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span lang=3D"EN" style=3D"f=
ont-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-lis=
t:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span>=
</span></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif">Are the labels that represent the Replication SID =
at the Downstream nodes downstream-allocated by these nodes or upstream-all=
ocated by the replication node?</span><span lang=3D"EN" style=3D"font-size:=
12.0pt;font-family:&quot;Courier New&quot;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Since the Re=
plication SID is locally relevant at a node, the Replication SID would be d=
ownstream-allocated. However, it may also be allocated by PCE; see response=
 to 5, 6 below<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, thanks.</i=
></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span lang=3D"EN" =
style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;"><o:p>&nbsp;<=
/o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &nbsp;&#8220;</span><span lang=
=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Re=
plication segment can be either provisioned locally on a node or programmed=
 by a PCE</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&q=
uot;,sans-serif">&#8221;. These two options look exactly the same to me fro=
m the POV of the node on which the Replication segment is programmed - what=
, if anything, did I miss?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are righ=
t in that it does not matter how Replication segment is instantiated at a n=
ode. The use of PCE is relevant for </span><a href=3D"https://clicktime.sym=
antec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%=
2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F"><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span></a><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> draf=
t where PCE instantiates Replication segments<span style=3D"color:#00B0F0">=
.<b><i>[[Sasha]] OK, I will &nbsp;look up the second draft. BTW, it does no=
t appear as a reference in this one &#8211; is it intentional?</i></b> <o:p=
></o:p></span></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">Did you consider a possibility of advertising the Repli=
cation Segment from the Downstream nodes to the Replication one using some =
multicast routing protocol (e.g., creating a SR-MPLS replacement for mLDP)?=
 Or is such a possibility strictly precluded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.5in;page-break-before:always"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do not =
strictly preclude any protocol , but one of the goals of SR is to simplify.=
 The idea is same here - use replication segments to realize P2MP trees com=
puted by PCE (without need of multicast protocols) as specified in SR P2MP =
draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-known as=
pects that make multicast different is that the traffic in the Service Prov=
ider domain is driven by the dynamic customer requests. Handling these requ=
ests via a PCE looks problematic to me. </span></i></b><span style=3D"color=
:#00B0F0"><o:p></o:p></span></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiatio=
n of the Replication Segment in SR-MPLS would be highly appreciated.<o:p></=
o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif">[RP]SR P2MP policy draft lists dif=
ferent protocols (PCEP, BGP, etc.) that can be used to instantiate Replicat=
ion segments. </span><a href=3D"https://clicktime.symantec.com/3JuFtE8qkd9V=
iz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-dhs-spring-p=
ce-sr-p2mp-policy-00"><span style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif">SR P2MP PCEP</span></a><span style=3D"font-size:11.0=
pt;font-family:&quot;Calibri&quot;,sans-serif"> would be updated; other dra=
fts will be published in future.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">More of the same...<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">Pleade note that if the anser to #3 in my original message is positive=
, then the statement in the draft that say the Replication Segment is simil=
ar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#212=
121">[RP] Since Replication SID is local to a Node, the Replication SID of =
the Replication segment at Root (or Headend) node can be used as a (constan=
t) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"colo=
r:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in 8=
204 and the Replication SID as defined here is that the former is instantia=
ted just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream nod=
es.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Rish=
abh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"mai=
lto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&=
gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 6:31 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a>=
; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cf=
ilsfil@cisco.com</a>&gt;; Rishabh Parekh (riparekh) &lt;<a href=3D"mailto:r=
iparekh@cisco.com">riparekh@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; <=
a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear colleagues,<o:p></o:p></p>
<p class=3D"MsoNormal">I have read the <a href=3D"https://clicktime.symante=
c.com/3G11JyktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2F=
draft-voyer-spring-sr-replication-segment-00">
Replication SID draft</a>, and I have a few questions dealing with possible=
 instantiation of the Replication SOD in
<a href=3D"https://clicktime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dht=
tps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpls-=
22">
SR-MPLS</a>.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft says that &#8220;</span><span lang=3D"EN" sty=
le=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">each branch is =
abstracted to a &lt;Downstream Node, Downstream Replication-SID&gt;</span><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">=
&#8221;. &nbsp;Does that mean that the </span><span lang=3D"EN" style=3D"fo=
nt-size:12.0pt;font-family:&quot;Courier New&quot;">Downstream Replication-=
SID</span><span lang=3D"EN" style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif"> </span><span style=3D"font-size:11.0pt;font-family:=
&quot;Calibri&quot;,sans-serif">is one of the SIDs defined in Sections 3, 4=
 and 5&nbsp; of </span><a href=3D"https://clicktime.symantec.com/3XUuhGHPMp=
ikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span s=
tyle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">RFC840=
2</span></a><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;=
,sans-serif">? <o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that</span> &#8220;<span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Replicat=
ion branch to a particular Downstream Node could be represented by the node=
's Node </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quo=
t;Times New Roman&quot;,serif">SID</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does this mean tha=
t the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node S=
ID as the active segment across such a replication branch?<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &#8220;</span><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">Replicatio=
n segment is instantiated at Downstream nodes and at the Replication node</=
span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">&#8221;. &nbsp;Does that mean that the list of SIDs associated with t=
he specific replication Branch is pushed by the Replication Node on top of =
the label representing the Replication SID in the Downstream node of this b=
ranch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span lang=3D"EN" style=3D"f=
ont-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-lis=
t:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span>=
</span></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif">Are the labels that represent the Replication SID =
at the Downstream nodes downstream-allocated by these nodes or upstream-all=
ocated by the replication node? </span><span lang=3D"EN" style=3D"font-size=
:12.0pt;font-family:&quot;Courier New&quot;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">The draft also says that &nbsp;&#8220;</span><span lang=
=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;">A Re=
plication segment can be either provisioned locally on a node or programmed=
 by a PCE</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&q=
uot;,sans-serif">&#8221;. These two options look exactly the same to me fro=
m the POV of the node on which the Replication segment is programmed - what=
, if anything, did I miss?<o:p></o:p></span></pre>
<pre style=3D"margin-left:.75in;text-indent:-.25in;page-break-before:always=
;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-list:Ign=
ore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span></spa=
n></span><![endif]><span style=3D"font-size:11.0pt;font-family:&quot;Calibr=
i&quot;,sans-serif">Did you consider a possibility of advertising the Repli=
cation Segment from the Downstream nodes to the Replication one using some =
multicast routing protocol (e.g., creating a SR-MPLS replacement for mLDP)?=
 Or is such a possibility strictly precluded?<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiatio=
n of the Replication Segment in SR-MPLS would be highly appreciated.<o:p></=
o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-5492663=
02<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vains=
htein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><br>
___________________________________________________________________________=
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To: Fred Baker <fredbaker.ietf@gmail.com>, Lizhenbin <lizhenbin@huawei.com>
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To: "Bertrand Duvivier (bduvivie)" <bduvivie@cisco.com>, Fred Baker <fredbaker.ietf@gmail.com>, Lizhenbin <lizhenbin@huawei.com>
Cc: "spring@ietf.org" <spring@ietf.org>, "ipv6@ietf.org" <ipv6@ietf.org>, "v6ops@ietf.org" <v6ops@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, Satoru Matsushima <satoru.matsushima@g.softbank.co.jp>
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From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [spring] New Version Notification for draft-matsushima-spring-srv6-deployment-status-02.txt
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Hmm.  That seems an overstatement.

IPv6 can carry NSH (RFC 8300) and support Service Chaining.

One can use IP-in-IP encapsulation to support FRR.

While the TE available without NSH or SR is limited capabilities.

And of course if the operators is willing to install MPLS, they can get 
all of the SRv6 capabilities by enabling MPLS (a capability all of their 
devices likely support.)

And there are costs and risks associated with deploying SRv6.

Yours,
Joel


On 10/22/2019 4:55 PM, Bertrand Duvivier (bduvivie) wrote:
> Fred,
> 
> IPv6 without SRH don't support TE, nor FRR (topology independent), nor Service Chaining, nor Network Programming, SRv6 does address all. Which what IPv4 never did, for IPv4, we had to add extra encap (MPLS,NSH,..) introducing constraints like no summarisation to deliver similar use-cases.
> 
> BTW I'm aware of
> - 5+ hardware vendors supporting SRv6
> - 4+ deployed SRv6 networks
> - 20+ network operators interested by SRv6
> - OS's supporting SRv6 like: Linux, FD.io,...
> Thus "before we push SRv6 deployement" sounds not longer an option, it is done already.
> 
> BRGDS Bertrand
> Cisco
> 
> 
> ï»¿On 18/10/2019, 01:52, "spring on behalf of Fred Baker" <spring-bounces@ietf.org on behalf of fredbaker.ietf@gmail.com> wrote:
> 
>      
>      > On Oct 17, 2019, at 5:30 AM, Lizhenbin <lizhenbin@huawei.com> wrote:
>      >
>      > In the past two years, China pushed the IPv6 deployment and almost all the IP networks of operators achieve the goal "IPv6 Ready". This provide a strong base for SRv6 deployments which can help operators provide new services based on IPv6 infrastructure.
>      
>      With respect, I would suggest that before we push for SRv6 deployment, we develop and SRv6 use case that IPv6 doesn't support. My perception is that SRv6 is a solution looking for a problem.
>      _______________________________________________
>      spring mailing list
>      spring@ietf.org
>      https://www.ietf.org/mailman/listinfo/spring
>      
>      
> 
> --------------------------------------------------------------------
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> 


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From: "Bertrand Duvivier (bduvivie)" <bduvivie@cisco.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>, Fred Baker <fredbaker.ietf@gmail.com>, Lizhenbin <lizhenbin@huawei.com>
CC: "spring@ietf.org" <spring@ietf.org>, "ipv6@ietf.org" <ipv6@ietf.org>, "v6ops@ietf.org" <v6ops@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, Satoru Matsushima <satoru.matsushima@g.softbank.co.jp>
Thread-Topic: [spring] New Version Notification for draft-matsushima-spring-srv6-deployment-status-02.txt
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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, 'SPRING WG List' <spring@ietf.org>
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Thread-Topic: Request for WG adoption of draft-dong-spring-sr-for-enhanced-vpn-05
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Hi Sasha,

Thanks a lot for your review comments. Please see some replies inline with =
[Jie]:

From: Alexander Vainshtein [mailto:Alexander.Vainshtein@ecitele.com]
Sent: Tuesday, October 22, 2019 2:38 PM
To: 'SPRING WG List' <spring@ietf.org<mailto:spring@ietf.org>>
Cc: spring-chairs@ietf.org<mailto:spring-chairs@ietf.org>; Dongjie (Jimmy) =
<jie.dong@huawei.com<mailto:jie.dong@huawei.com>>
Subject: RE: Request for WG adoption of draft-dong-spring-sr-for-enhanced-v=
pn-05


Hi all,

I have read the document and I think that matches the two criteria that are=
 usually considered for deciding whether the draft can be adopted:

1.       It discusses a high relevant problem within the scope of the WG Ch=
arter

2.       It provides a reasonable basis for the solution of this problem.



[Jie] Thanks for your support.



At the same time I have some concerns about this draft. These concerns are =
not blockers for adoption, but, IMHOL and FWIW, should be resolved before t=
he draft moves further.



Several fragments in Section 2.1 need some additional work IMHO. E.g. (the =
problematic fragments are highlighted)::



1.       The following text may be misleading


   For one particular IGP link, multiple Adj-SIDs SHOULD be allocated,
   each of which is associated with a particular virtual network
   topology, and MAY represent a subset of link resources.  Several
   approaches can be used to partition the link resource, such as
   logical sub-interfaces, dedicated queues, etc.



I am not sure a single IGP link can be split into multiple logical sub-inte=
rfaces. As I see it, logical sub-interfaces of a link usually act as indivi=
dual IGP links of and by themselves.



[Jie] The logical sub-interfaces here can be considered as L2 virtual inter=
faces, or something equivalent to them. The point is they can be distinguis=
hed in data plane, while in control plane they could share the same IGP ses=
sion.



2.       Immediately after that the draft says that:



   Similarly, for one particular IGP node, multiple node-SIDs SHOULD be

   allocated, each of which is associated with a specific virtual

   network topology, and may represent a subset of the node resource

   (e.g. the processing resources).



I wonder why only Node-SIDs and not any Prefix-SID can be associated with  =
a specific virtual topology. Among other things, such a restriction prevent=
s using Anycast SIDs (which, by definition, are not Node-SIDs).



[Jie] Good catch.  I agree that Anycast SID should also be covered. We will=
 change the node-SIDs to prefix-SID in next version.



3.       The following text seems to contradict the basic architecture of S=
R:



   A group of adj-SIDs and node-SIDs associated with the same virtual

   network can be used to construct the SR SID-lists (either strict or

   loose) to steer the traffic of a particular enhanced VPN service.

   This group of SIDs MAY also represent the set of network resources

   which are reserved for a specific enhanced VPN, or a group of

   enhanced VPNs.



It seems to suggest that a list of SIDs may be associated with a particular=
 network resource while specific SIDs in this list are not associated with =
this resource. But in SR-MPLS, only the current active SID defines all aspe=
cts of the packet disposition, including the resources used for its forward=
ing.



[Jie] The text allows flexible semantics and behavior of SIDs, thus a SID m=
ay or may not be associated with a particular network resource in the forwa=
rding plane, so as to meet both the resource isolation and resource sharing=
 cases. For each hop along the path, still it is the active SID which is us=
ed to determine the forwarding behavior, including whether specific resourc=
e should be used.



4.       The following restriction looks excessively strong to me:



When a node-SID is used in the SID-list to build an SR loose path, the

transit nodes use the node-SID to identify the virtual network, and

MAY process the packet using the local resources allocated for the

corresponding virtual network.  Note in this case, Penultimate Hop

Popping (PHP) [RFC3031<https://tools.ietf.org/html/rfc3031>] MUST be disabl=
ed.



IMHO and FWIW the no PHP requirement may be relaxed, because the virtual to=
pology and the resources associated with it would be derived from the next =
active SID (if any). And if there is no next SID, these resources could be =
inferred from the specific instance of the enhanced VPN service.  (Maybe th=
e draft should explicitly state that a given enhanced VPN service instance =
should be restricted to using a given virtual topology and a given set of n=
etwork resources.)



[Jie] This makes sense to me. We will consider to relax this requirement in=
 next version.



The procedures described in Section 4 of the draft seem to assume that each=
 enhanced VPN service will use its own virtual topology and resources in th=
e underlay.

At the same time the draft mentions in many places that a given virtual top=
ology and its associated set of network resources can be used by a group of=
 enhanved VPN service instances.

The latter looks like a much nore scalable approach to me.



[Jie] Yes a group of enhanced VPNs could use the same virtual topology and =
the associated set of network resources. And the draft does not exclude the=
 case in which a specific enhanced VPN can have its own virtual topology an=
d network resources. In summary, both cases can be supported according to t=
he service requirement. We could clarify this in next version.



As already mentioned, I do not see any of my comments as blockers for adopt=
ion of the draft.  Hopefully they will be useful.



[Jie] They are very helpful for improving this document. Thanks again for y=
our comments and support.



Best regards,

Jie



Regards,

Sasha



Office: +972-39266302

Cell:      +972-549266302

Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecite=
le.com>





-----Original Message-----
From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On B=
ehalf Of Dongjie (Jimmy)
Sent: Monday, October 21, 2019 8:22 AM
To: 'SPRING WG List' <spring@ietf.org<mailto:spring@ietf.org>>
Cc: spring-chairs@ietf.org<mailto:spring-chairs@ietf.org>
Subject: [spring] Request for WG adoption of draft-dong-spring-sr-for-enhan=
ced-vpn-05



Dear WG and Chairs,



A new revision of draft-dong-spring-sr-for-enhanced-vpn has been uploaded t=
o resolve some recently received comments. This document describes the Segm=
ent Routing based mechanism to provide enhanced VPN, which aligns with the =
enhanced VPN (VPN)+ framework document in TEAS WG. The mechanism could be u=
sed to enable transport network slicing for 5G.



The major changes compared to the -04 version are:



  1. Update the draft template.



  2. Add reference to the definition of network slicing in 3GPP TS23.501 an=
d the definition of transport network slicing in draft-ietf-teas-enhanced-v=
pn-03 respectively.



  3. Editorial changes in several sections to clarify and improve the reada=
bility.



  4. Change some coauthors' affiliation and mail address.



This update shows that the major content of this draft has become stable an=
d solid, thus the authors would like to request the WG to consider the adop=
tion of this document.



Comments are always welcome. Thanks.



Best regards,

Jie



-----Original Message-----

From: internet-drafts@ietf.org<mailto:internet-drafts@ietf.org> [mailto:int=
ernet-drafts@ietf.org]

Sent: Wednesday, October 16, 2019 3:28 PM

To: Takuya Miyasaka <ta-miyasaka@kddi.com<mailto:ta-miyasaka@kddi.com>>; Zh=
enqiang Li <li_zhenqiang@hotmail.com<mailto:li_zhenqiang@hotmail.com>>; Fen=
gwei Qin <qinfengwei@chinamobile.com<mailto:qinfengwei@chinamobile.com>>; S=
tewart Bryant <stewart.bryant@gmail.com<mailto:stewart.bryant@gmail.com>>; =
Yongqing Zhu <zhuyq.gd@chinatelecom.cn<mailto:zhuyq.gd@chinatelecom.cn>>; D=
ongjie (Jimmy) <jie.dong@huawei.com<mailto:jie.dong@huawei.com>>

Subject: New Version Notification for draft-dong-spring-sr-for-enhanced-vpn=
-05.txt





A new version of I-D, draft-dong-spring-sr-for-enhanced-vpn-05.txt

has been successfully submitted by Jie Dong and posted to the IETF reposito=
ry.



Name:                  draft-dong-spring-sr-for-enhanced-vpn

Revision:              05

Title:                      Segment Routing for Enhanced VPN Service

Document date:               2019-10-16

Group:                  Individual Submission

Pages:                   20

URL:            https://clicktime.symantec.com/3ALPFrm3RynBsKbF1oU2uum6H2?u=
=3Dhttps%3A%2F%2Fwww.ietf.org%2Finternet-drafts%2Fdraft-dong-spring-sr-for-=
enhanced-vpn-05.txt

Status:         https://clicktime.symantec.com/3Ke26NtAMQpPmNpsJSjbjfC6H2?u=
=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-dong-spring-sr-for-enha=
nced-vpn%2F

Htmlized:       https://clicktime.symantec.com/38csYFW7vnAShtJtkSWCXTa6H2?u=
=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-dong-spring-sr-for-enhanced-=
vpn-05

Htmlized:       https://clicktime.symantec.com/354AuwRvQiKbYh6cGRF6EnT6H2?u=
=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-dong-spring-sr-f=
or-enhanced-vpn

Diff:           https://clicktime.symantec.com/3HgF1QzcMezZQRxNmfgfoeE6H2?u=
=3Dhttps%3A%2F%2Fwww.ietf.org%2Frfcdiff%3Furl2%3Ddraft-dong-spring-sr-for-e=
nhanced-vpn-05



Abstract:

   Enhanced VPN (VPN+) is an enhancement to VPN services to enable it to

   support the needs of new applications, particularly applications that

   are associated with 5G services.  These applications require better

   isolation from both control and data plane's perspective and have

   more stringent performance requirements than can be provided with

   overlay VPNs.  The characteristics of an enhanced VPN as perceived by

   its tenant needs to be comparable to those of a dedicated private

   network.  This requires tight integration between the overlay VPN and

   the underlay network topology and resources in a scalable manner.  An

   enhanced VPN may form the underpinning of 5G network slicing, but

   will also be of use in its own right.  This document describes how to

   use segment routing based mechanisms to provide the enhanced VPN

   service with the required network topology and resources.  The

   overall mechanism of providing segment routing based enhanced VPN

   service is also described.  The proposed mechanism is applicable to

   both segment routing with MPLS data plane (SR-MPLS) and segment

   routing with IPv6 data plane (SRv6).











Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.



The IETF Secretariat



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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Hi Sasha,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Thanks a lot for your review comments. Please see some replies in=
line with [Jie]:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Alexander Vainshtein [<a href=3D"mailto:Alexander.Vainshtein@ec=
itele.com">mailto:Alexander.Vainshtein@ecitele.com</a>]
<br>
<b>Sent:</b> Tuesday, October 22, 2019 2:38 PM<br>
<b>To:</b> 'SPRING WG List' &lt;<a href=3D"mailto:spring@ietf.org">spring@i=
etf.org</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring-chairs@ietf.org">spring-chairs@ietf.org=
</a>; Dongjie (Jimmy) &lt;<a href=3D"mailto:jie.dong@huawei.com">jie.dong@h=
uawei.com</a>&gt;<br>
<b>Subject:</b> RE: Request for WG adoption of draft-dong-spring-sr-for-enh=
anced-vpn-05<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Hi all,<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">I have read the document and=
 I think that matches the two criteria that are usually considered for deci=
ding whether the draft can be adopted:<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;m=
so-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">1=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">It discusses a high rel=
evant problem within the scope of the WG Charter<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;m=
so-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">2=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">It provides a reasonabl=
e basis for the solution of this problem.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.5pt;co=
lor:#1F497D">[Jie] Thanks for your support.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">At the same time I have some=
 concerns about this draft. These concerns are not blockers for adoption, b=
ut, IMHOL and FWIW, should be resolved before the draft moves further.<o:p>=
</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Several fragments in Section=
 2.1 need some additional work IMHO. E.g. (the problematic fragments are
<span style=3D"background:yellow;mso-highlight:yellow">highlighted</span>):=
:<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;m=
so-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">1=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The following text may =
be misleading
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">&n=
bsp;&nbsp; For
<span style=3D"background:yellow;mso-highlight:yellow">one particular IGP l=
ink</span>, multiple Adj-SIDs SHOULD be allocated,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">&n=
bsp;&nbsp; each of which is associated with a particular virtual network<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">&n=
bsp;&nbsp; topology, and MAY represent a subset of link resources.&nbsp; Se=
veral<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">&n=
bsp;&nbsp; approaches can be used to partition the link resource, such as<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">&n=
bsp;&nbsp;
<span style=3D"background:yellow;mso-highlight:yellow">logical sub-interfac=
es</span>, dedicated queues, etc.&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"text-indent:36.0pt"><span lang=3D"EN-US"=
>I am not sure a single IGP link can be split into multiple logical sub-int=
erfaces. As I see it, logical sub-interfaces of a link usually act as indiv=
idual IGP links of and by themselves.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.5pt;co=
lor:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.5pt;co=
lor:#1F497D">[Jie] The logical sub-interfaces here can be considered as L2 =
virtual interfaces, or something equivalent to them. The point is they can =
be distinguished in data plane, while
 in control plane they could share the same IGP session. &nbsp;<o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;m=
so-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">2=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Immediately after that =
the draft says that:
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"color:black=
">&nbsp;&nbsp; Similarly, for one particular IGP node, multiple <span style=
=3D"background:yellow;mso-highlight:yellow">node-SIDs SHOULD be<o:p></o:p><=
/span></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"color:black=
;background:yellow;mso-highlight:yellow">&nbsp;&nbsp; allocated, each of wh=
ich is associated with a specific virtual<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"color:black=
;background:yellow;mso-highlight:yellow">&nbsp;&nbsp; network topolog</span=
><span lang=3D"EN-US" style=3D"color:black">y, and may represent a subset o=
f the node resource<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"color:black=
">&nbsp;&nbsp; (e.g. the processing resources).<o:p></o:p></span></pre>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"text-indent:36.0pt"><span lang=3D"EN-US"=
>I wonder why only Node-SIDs and not any Prefix-SID can be associated with =
&nbsp;a specific virtual topology. Among other things, such a restriction p=
revents using Anycast SIDs (which, by definition,
 are not Node-SIDs).<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.5pt;co=
lor:#1F497D">[Jie] Good catch. &nbsp;I agree that Anycast SID should also b=
e covered. We will change the node-SIDs to prefix-SID in next version.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"text-indent:36.0pt"><span lang=3D"EN-US"=
><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;m=
so-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">3=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The following text seem=
s to contradict the basic architecture of SR:<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt"><span lang=3D"EN-US"=
><o:p>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"color:black=
">&nbsp;&nbsp; A group of adj-SIDs and node-SIDs associated with the same v=
irtual<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"color:black=
">&nbsp;&nbsp; network can be used to construct the <span style=3D"backgrou=
nd:yellow;mso-highlight:yellow">SR SID-lists</span> (either strict or<o:p><=
/o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"color:black=
">&nbsp;&nbsp; loose) to steer the traffic of a particular enhanced VPN ser=
vice.<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"color:black=
">&nbsp;&nbsp; This <span style=3D"background:yellow;mso-highlight:yellow">=
group of SIDs MAY also represent the set of network resources</span><o:p></=
o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"color:black=
">&nbsp;&nbsp; which are reserved for a specific enhanced VPN, or a group o=
f<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"color:black=
">&nbsp;&nbsp; enhanced VPNs.<o:p></o:p></span></pre>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt"><span lang=3D"EN-US"=
><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt"><span lang=3D"EN-US"=
>It seems to suggest that a list of SIDs may be associated with a particula=
r network resource while specific SIDs in this list are not associated with=
 this resource. But in SR-MPLS, only the
 current active SID defines all aspects of the packet disposition, includin=
g the resources used for its forwarding.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.5pt;co=
lor:#1F497D">[Jie] The text allows flexible semantics and behavior of SIDs,=
 thus a SID may or may not be associated with a particular network resource=
 in the forwarding plane, so as to meet
 both the resource isolation and resource sharing cases. For each hop along=
 the path, still it is the active SID which is used to determine the forwar=
ding behavior, including whether specific resource should be used.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt"><span lang=3D"EN-US"=
><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:36.0pt;text-indent:-18.0pt;m=
so-list:l1 level1 lfo4">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">4=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The following restricti=
on looks excessively strong to me:<o:p></o:p></span></p>
<pre><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"margin-left:45.8pt"><span lang=3D"EN-US" style=3D"color:black=
">When a node-SID is used in the SID-list to build an SR loose path, the <o=
:p></o:p></span></pre>
<pre style=3D"margin-left:45.8pt"><span lang=3D"EN-US" style=3D"color:black=
">transit nodes use the node-SID to identify the virtual network, and<o:p><=
/o:p></span></pre>
<pre style=3D"margin-left:45.8pt"><span lang=3D"EN-US" style=3D"color:black=
">MAY process the packet using the local resources allocated for the<o:p></=
o:p></span></pre>
<pre style=3D"margin-left:45.8pt"><span lang=3D"EN-US" style=3D"color:black=
">corresponding virtual network.&nbsp; <span style=3D"background:yellow;mso=
-highlight:yellow">Note in this case, Penultimate Hop<o:p></o:p></span></sp=
an></pre>
<pre style=3D"margin-left:45.8pt"><span lang=3D"EN-US" style=3D"color:black=
;background:yellow;mso-highlight:yellow">Popping (PHP) [</span><span lang=
=3D"EN-US"><a href=3D"https://tools.ietf.org/html/rfc3031" title=3D"&quot;M=
ultiprotocol Label Switching Architecture&quot;"><span style=3D"background:=
yellow;mso-highlight:yellow">RFC3031</span></a><span style=3D"color:black;b=
ackground:yellow;mso-highlight:yellow">] MUST be disabled</span><span style=
=3D"color:black">.<o:p></o:p></span></span></pre>
<pre><span lang=3D"EN-US" style=3D"color:black"><o:p>&nbsp;</o:p></span></p=
re>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"font-size:1=
1.0pt;font-family:&quot;Calibri&quot;,sans-serif">IMHO and FWIW the no PHP =
requirement may be relaxed, because the virtual topology and the resources =
associated with it would be derived from the next active SID (if any). And =
if there is no next SID, these resources could be inferred from the specifi=
c instance of the enhanced VPN service. &nbsp;(Maybe the draft should expli=
citly state that a given enhanced VPN service instance should be restricted=
 to using a given virtual topology and a given set of network resources.)<o=
:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.5pt;co=
lor:#1F497D">[Jie] This makes sense to me. We will consider to relax this r=
equirement in next version.
<o:p></o:p></span></p>
<pre style=3D"margin-left:36.0pt"><span lang=3D"EN-US" style=3D"color:black=
"><o:p>&nbsp;</o:p></span></pre>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">The procedures described in =
Section 4 of the draft seem to assume that each enhanced VPN service will u=
se its own virtual topology and resources in the underlay.<o:p></o:p></span=
></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">At the same time the draft m=
entions in many places that a given virtual topology and its associated set=
 of network resources can be used by a group of enhanved VPN service instan=
ces.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">The latter looks like a much=
 nore scalable approach to me.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.5pt;co=
lor:#1F497D">[Jie] Yes a group of enhanced VPNs could use the same virtual =
topology and the associated set of network resources. And the draft does no=
t exclude the case in which a specific
 enhanced VPN can have its own virtual topology and network resources. In s=
ummary, both cases can be supported according to the service requirement. W=
e could clarify this in next version.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">As already mentioned, I do n=
ot see any of my comments as blockers for adoption of the draft. &nbsp;Hope=
fully they will be useful.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.5pt;co=
lor:#1F497D">[Jie] They are very helpful for improving this document. Thank=
s again for your comments and support.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.5pt;co=
lor:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.5pt;co=
lor:#1F497D">Best regards,<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:10.5pt;co=
lor:#1F497D">Jie<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Regards,<o:p></o:p></span></=
p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Office: &#43;972-39266302<o:=
p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Email:&nbsp;&nbsp; <a href=
=3D"mailto:Alexander.Vainshtein@ecitele.com">
Alexander.Vainshtein@ecitele.com</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">-----Original Message-----<b=
r>
From: spring &lt;<a href=3D"mailto:spring-bounces@ietf.org">spring-bounces@=
ietf.org</a>&gt; On Behalf Of Dongjie (Jimmy)<br>
Sent: Monday, October 21, 2019 8:22 AM<br>
To: 'SPRING WG List' &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org=
</a>&gt;<br>
Cc: <a href=3D"mailto:spring-chairs@ietf.org">spring-chairs@ietf.org</a><br=
>
Subject: [spring] Request for WG adoption of draft-dong-spring-sr-for-enhan=
ced-vpn-05<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Dear WG and Chairs, <o:p></o=
:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">A new revision of draft-dong=
-spring-sr-for-enhanced-vpn has been uploaded to resolve some recently rece=
ived comments. This document describes the Segment Routing based mechanism =
to provide enhanced VPN, which aligns
 with the enhanced VPN (VPN)&#43; framework document in TEAS WG. The mechan=
ism could be used to enable transport network slicing for 5G.<o:p></o:p></s=
pan></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">The major changes compared t=
o the -04 version are:<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp; 1. Update the draft t=
emplate. <o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp; 2. Add reference to t=
he definition of network slicing in 3GPP TS23.501 and the definition of tra=
nsport network slicing in draft-ietf-teas-enhanced-vpn-03 respectively.<o:p=
></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp; 3. Editorial changes =
in several sections to clarify and improve the readability.<o:p></o:p></spa=
n></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp; 4. Change some coauth=
ors' affiliation and mail address.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">This update shows that the m=
ajor content of this draft has become stable and solid, thus the authors wo=
uld like to request the WG to consider the adoption of this document.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Comments are always welcome.=
 Thanks.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Best regards,<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Jie<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">-----Original Message-----<o=
:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">From: <a href=3D"mailto:inte=
rnet-drafts@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">internet-drafts@ietf.=
org</span></a> [<a href=3D"mailto:internet-drafts@ietf.org"><span style=3D"=
color:windowtext;text-decoration:none">mailto:internet-drafts@ietf.org</spa=
n></a>]
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Sent: Wednesday, October 16,=
 2019 3:28 PM<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">To: Takuya Miyasaka &lt;<a h=
ref=3D"mailto:ta-miyasaka@kddi.com"><span style=3D"color:windowtext;text-de=
coration:none">ta-miyasaka@kddi.com</span></a>&gt;; Zhenqiang Li &lt;<a hre=
f=3D"mailto:li_zhenqiang@hotmail.com"><span style=3D"color:windowtext;text-=
decoration:none">li_zhenqiang@hotmail.com</span></a>&gt;;
 Fengwei Qin &lt;<a href=3D"mailto:qinfengwei@chinamobile.com"><span style=
=3D"color:windowtext;text-decoration:none">qinfengwei@chinamobile.com</span=
></a>&gt;; Stewart Bryant &lt;<a href=3D"mailto:stewart.bryant@gmail.com"><=
span style=3D"color:windowtext;text-decoration:none">stewart.bryant@gmail.c=
om</span></a>&gt;;
 Yongqing Zhu &lt;<a href=3D"mailto:zhuyq.gd@chinatelecom.cn"><span style=
=3D"color:windowtext;text-decoration:none">zhuyq.gd@chinatelecom.cn</span><=
/a>&gt;; Dongjie (Jimmy) &lt;<a href=3D"mailto:jie.dong@huawei.com"><span s=
tyle=3D"color:windowtext;text-decoration:none">jie.dong@huawei.com</span></=
a>&gt;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Subject: New Version Notific=
ation for draft-dong-spring-sr-for-enhanced-vpn-05.txt<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">A new version of I-D, draft-=
dong-spring-sr-for-enhanced-vpn-05.txt<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">has been successfully submit=
ted by Jie Dong and posted to the IETF repository.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Name:&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; draft-dong-spring-sr-for-enhanced-vpn<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Revision:&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 05<o:p></o:p></=
span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Title:&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Segment Routing for Enhanced VPN Service<o:p>=
</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Document date:&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2019=
-10-16<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Group:&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; Individual Submission<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Pages:&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; 20<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">URL:&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"https://clicktime.sym=
antec.com/3ALPFrm3RynBsKbF1oU2uum6H2?u=3Dhttps%3A%2F%2Fwww.ietf.org%2Finter=
net-drafts%2Fdraft-dong-spring-sr-for-enhanced-vpn-05.txt">
<span style=3D"color:windowtext;text-decoration:none">https://clicktime.sym=
antec.com/3ALPFrm3RynBsKbF1oU2uum6H2?u=3Dhttps%3A%2F%2Fwww.ietf.org%2Finter=
net-drafts%2Fdraft-dong-spring-sr-for-enhanced-vpn-05.txt</span></a><o:p></=
o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Status:&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"https://clicktime.symantec.com/3Ke26=
NtAMQpPmNpsJSjbjfC6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-=
dong-spring-sr-for-enhanced-vpn%2F">
<span style=3D"color:windowtext;text-decoration:none">https://clicktime.sym=
antec.com/3Ke26NtAMQpPmNpsJSjbjfC6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org=
%2Fdoc%2Fdraft-dong-spring-sr-for-enhanced-vpn%2F</span></a><o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Htmlized:&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; <a href=3D"https://clicktime.symantec.com/38csYFW7vnAShtJ=
tkSWCXTa6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-dong-spring-sr-=
for-enhanced-vpn-05">
<span style=3D"color:windowtext;text-decoration:none">https://clicktime.sym=
antec.com/38csYFW7vnAShtJtkSWCXTa6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtm=
l%2Fdraft-dong-spring-sr-for-enhanced-vpn-05</span></a><o:p></o:p></span></=
p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Htmlized:&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; <a href=3D"https://clicktime.symantec.com/354AuwRvQiKbYh6=
cGRF6EnT6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-don=
g-spring-sr-for-enhanced-vpn">
<span style=3D"color:windowtext;text-decoration:none">https://clicktime.sym=
antec.com/354AuwRvQiKbYh6cGRF6EnT6H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org=
%2Fdoc%2Fhtml%2Fdraft-dong-spring-sr-for-enhanced-vpn</span></a><o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Diff:&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"https://clicktime.symantec=
.com/3HgF1QzcMezZQRxNmfgfoeE6H2?u=3Dhttps%3A%2F%2Fwww.ietf.org%2Frfcdiff%3F=
url2%3Ddraft-dong-spring-sr-for-enhanced-vpn-05">
<span style=3D"color:windowtext;text-decoration:none">https://clicktime.sym=
antec.com/3HgF1QzcMezZQRxNmfgfoeE6H2?u=3Dhttps%3A%2F%2Fwww.ietf.org%2Frfcdi=
ff%3Furl2%3Ddraft-dong-spring-sr-for-enhanced-vpn-05</span></a><o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Abstract:<o:p></o:p></span><=
/p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; Enhanced VPN (V=
PN&#43;) is an enhancement to VPN services to enable it to<o:p></o:p></span=
></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; support the nee=
ds of new applications, particularly applications that<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; are associated =
with 5G services.&nbsp; These applications require better<o:p></o:p></span>=
</p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; isolation from =
both control and data plane's perspective and have<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; more stringent =
performance requirements than can be provided with<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; overlay VPNs.&n=
bsp; The characteristics of an enhanced VPN as perceived by<o:p></o:p></spa=
n></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; its tenant need=
s to be comparable to those of a dedicated private<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; network.&nbsp; =
This requires tight integration between the overlay VPN and<o:p></o:p></spa=
n></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; the underlay ne=
twork topology and resources in a scalable manner.&nbsp; An<o:p></o:p></spa=
n></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; enhanced VPN ma=
y form the underpinning of 5G network slicing, but<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; will also be of=
 use in its own right.&nbsp; This document describes how to<o:p></o:p></spa=
n></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; use segment rou=
ting based mechanisms to provide the enhanced VPN<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; service with th=
e required network topology and resources. &nbsp;The<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; overall mechani=
sm of providing segment routing based enhanced VPN<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; service is also=
 described.&nbsp; The proposed mechanism is applicable to<o:p></o:p></span>=
</p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; both segment ro=
uting with MPLS data plane (SR-MPLS) and segment<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp; routing with IP=
v6 data plane (SRv6).<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Please note that it may take=
 a couple of minutes from the time of submission until the htmlized version=
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To: li zhenqiang <li_zhenqiang@hotmail.com>
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Thread-Topic: [spring] Request for WG adoption of draft-dong-spring-sr-for-enhanced-vpn-05
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Content-Type: text/plain; charset="us-ascii"
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Hello Zhenqiang Li,

Thank you for expressing your interest in this document.
WG adoption poll are initiated by the chairs. For this document, the adopti=
on poll has not started.

In the meantime, you are welcome to provide a review and comments. That's h=
ow we improve and progress documents.

Best regards,
--Bruno

From: li zhenqiang [mailto:li_zhenqiang@hotmail.com]
Sent: Monday, October 21, 2019 12:16 PM
To: Dongjie (Jimmy); spring@ietf.org
Cc: spring-chairs@ietf.org
Subject: Re: [spring] Request for WG adoption of draft-dong-spring-sr-for-e=
nhanced-vpn-05

Hello all and chairs,

I support the adoption poll as a co-author. I believe the doc is mature eno=
ugh to be a wg item.

Best Regards,
Zhenqiang Li
________________________________
li_zhenqiang@hotmail.com

From: Dongjie (Jimmy)<mailto:jie.dong@huawei.com>
Date: 2019-10-21 13:21
To: 'SPRING WG List'<mailto:spring@ietf.org>
CC: spring-chairs@ietf.org<mailto:spring-chairs@ietf.org>
Subject: [spring] Request for WG adoption of draft-dong-spring-sr-for-enhan=
ced-vpn-05
Dear WG and Chairs,

A new revision of draft-dong-spring-sr-for-enhanced-vpn has been uploaded t=
o resolve some recently received comments. This document describes the Segm=
ent Routing based mechanism to provide enhanced VPN, which aligns with the =
enhanced VPN (VPN)+ framework document in TEAS WG. The mechanism could be u=
sed to enable transport network slicing for 5G.

The major changes compared to the -04 version are:

  1. Update the draft template.

  2. Add reference to the definition of network slicing in 3GPP TS23.501 an=
d the definition of transport network slicing in draft-ietf-teas-enhanced-v=
pn-03 respectively.

  3. Editorial changes in several sections to clarify and improve the reada=
bility.

  4. Change some coauthors' affiliation and mail address.

This update shows that the major content of this draft has become stable an=
d solid, thus the authors would like to request the WG to consider the adop=
tion of this document.

Comments are always welcome. Thanks.

Best regards,
Jie

-----Original Message-----
From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
Sent: Wednesday, October 16, 2019 3:28 PM
To: Takuya Miyasaka <ta-miyasaka@kddi.com>; Zhenqiang Li <li_zhenqiang@hotm=
ail.com>; Fengwei Qin <qinfengwei@chinamobile.com>; Stewart Bryant <stewart=
.bryant@gmail.com>; Yongqing Zhu <zhuyq.gd@chinatelecom.cn>; Dongjie (Jimmy=
) <jie.dong@huawei.com>
Subject: New Version Notification for draft-dong-spring-sr-for-enhanced-vpn=
-05.txt


A new version of I-D, draft-dong-spring-sr-for-enhanced-vpn-05.txt
has been successfully submitted by Jie Dong and posted to the IETF reposito=
ry.

Name: draft-dong-spring-sr-for-enhanced-vpn
Revision: 05
Title: Segment Routing for Enhanced VPN Service
Document date: 2019-10-16
Group: Individual Submission
Pages: 20
URL:            https://www.ietf.org/internet-drafts/draft-dong-spring-sr-f=
or-enhanced-vpn-05.txt
Status:         https://datatracker.ietf.org/doc/draft-dong-spring-sr-for-e=
nhanced-vpn/
Htmlized:       https://tools.ietf.org/html/draft-dong-spring-sr-for-enhanc=
ed-vpn-05
Htmlized:       https://datatracker.ietf.org/doc/html/draft-dong-spring-sr-=
for-enhanced-vpn
Diff:           https://www.ietf.org/rfcdiff?url2=3Ddraft-dong-spring-sr-fo=
r-enhanced-vpn-05

Abstract:
   Enhanced VPN (VPN+) is an enhancement to VPN services to enable it to
   support the needs of new applications, particularly applications that
   are associated with 5G services.  These applications require better
   isolation from both control and data plane's perspective and have
   more stringent performance requirements than can be provided with
   overlay VPNs.  The characteristics of an enhanced VPN as perceived by
   its tenant needs to be comparable to those of a dedicated private
   network.  This requires tight integration between the overlay VPN and
   the underlay network topology and resources in a scalable manner.  An
   enhanced VPN may form the underpinning of 5G network slicing, but
   will also be of use in its own right.  This document describes how to
   use segment routing based mechanisms to provide the enhanced VPN
   service with the required network topology and resources.  The
   overall mechanism of providing segment routing based enhanced VPN
   service is also described.  The proposed mechanism is applicable to
   both segment routing with MPLS data plane (SR-MPLS) and segment
   routing with IPv6 data plane (SRv6).





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pt">
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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-bidi-font-family:&quo=
t;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">Hello Zhenqi=
ang Li,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-bidi-font-family:&quo=
t;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;<=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-bidi-font-family:&quo=
t;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">Thank you fo=
r expressing your interest in this document.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-bidi-font-family:&quo=
t;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">WG adoption =
poll are initiated by the chairs. For this document, the adoption poll
 has not started.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-bidi-font-family:&quo=
t;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;<=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-bidi-font-family:&quo=
t;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">In the meant=
ime, you are welcome to provide a review and comments. That&#8217;s how we
 improve and progress documents.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-bidi-font-family:&quo=
t;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;<=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-bidi-font-family:&quo=
t;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">Best regards=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-bidi-font-family:&quo=
t;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">--Bruno<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-bidi-font-family:&quo=
t;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;<=
/o:p></span></p>
<div>
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0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span class=3D"SpellE">=
<b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;san=
s-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;">From</sp=
an></b></span><b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&q=
uot;,&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&q=
uot;">:</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&=
quot;,&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&=
quot;">
 li zhenqiang [mailto:li_zhenqiang@hotmail.com] <br>
<b>Sent:</b> Monday, October 21, 2019 12:16 PM<br>
<b>To:</b> Dongjie (Jimmy); spring@ietf.org<br>
<b>Cc:</b> spring-chairs@ietf.org<br>
<b>Subject:</b> Re: [spring] Request for WG adoption of draft-dong-spring-s=
r-for-enhanced-vpn-05<o:p></o:p></span></p>
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<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Hello all and chairs,<o:p></o=
:p></span></p>
</div>
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<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">I support the adoption poll a=
s a co-author. I believe the doc is mature enough to be a wg item.&nbsp;<o:=
p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Best Regards,<o:p></o:p></spa=
n></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Zhenqiang Li<o:p></o:p></span=
></p>
</div>
<div class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-s=
ize:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-=
family:&quot;Times New Roman&quot;;color:black">
<hr size=3D"1" width=3D"210" style=3D"width:157.5pt" noshade=3D"" style=3D"=
color:#B5C4DF" align=3D"left">
</span></div>
<div>
<div style=3D"margin-left:7.5pt;margin-top:7.5pt;margin-right:7.5pt;margin-=
bottom:7.5pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;mso-fareast=
-font-family:&quot;Times New Roman&quot;;color:black">li_zhenqiang@hotmail.=
com<o:p></o:p></span></p>
</div>
</div>
</div>
<blockquote style=3D"margin-left:6.0pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;background:#EFEFEF"><b><=
span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-ser=
if&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;color:black">F=
rom:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot=
;,&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&quot=
;;color:black">&nbsp;<a href=3D"mailto:jie.dong@huawei.com">Dongjie
 (Jimmy)</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;background:#EFEFEF"><b><=
span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-ser=
if&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;color:black">D=
ate:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot=
;,&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&quot=
;;color:black">&nbsp;2019-10-21&nbsp;13:21<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;background:#EFEFEF"><b><=
span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-ser=
if&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;color:black">T=
o:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,=
&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;=
color:black">&nbsp;<a href=3D"mailto:spring@ietf.org">'SPRING
 WG List'</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;background:#EFEFEF"><b><=
span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-ser=
if&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;color:black">C=
C:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,=
&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;=
color:black">&nbsp;<a href=3D"mailto:spring-chairs@ietf.org">spring-chairs@=
ietf.org</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;background:#EFEFEF"><b><=
span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-ser=
if&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;color:black">S=
ubject:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&q=
uot;,&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&q=
uot;;color:black">&nbsp;[spring]
 Request for WG adoption of draft-dong-spring-sr-for-enhanced-vpn-05<o:p></=
o:p></span></p>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Dear WG and Chairs,
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">A new revision of draft-dong-=
spring-sr-for-enhanced-vpn has been uploaded to resolve some recently
 received comments. This document describes the Segment Routing based mecha=
nism to provide enhanced VPN, which aligns with the enhanced VPN (VPN)&#43;=
 framework document in TEAS WG. The mechanism could be used to enable trans=
port network slicing for 5G.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">The major changes compared to=
 the -04 version are:<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp; 1. Update the draft te=
mplate.
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp; 2. Add reference to th=
e definition of network slicing in 3GPP TS23.501 and the definition of tran=
sport
 network slicing in draft-ietf-teas-enhanced-vpn-03 respectively.<o:p></o:p=
></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp; 3. Editorial changes i=
n several sections to clarify and improve the readability.<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp; 4. Change some coautho=
rs' affiliation and mail address.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">This update shows that the ma=
jor content of this draft has become stable and solid, thus the authors
 would like to request the WG to consider the adoption of this document. <o=
:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Comments are always welcome. =
Thanks.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Best regards,<o:p></o:p></spa=
n></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Jie<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">-----Original Message-----<o:=
p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">From: internet-drafts@ietf.or=
g [mailto:internet-drafts@ietf.org]
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Sent: Wednesday, October 16, =
2019 3:28 PM<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">To: Takuya Miyasaka &lt;ta-mi=
yasaka@kddi.com&gt;; Zhenqiang Li &lt;li_zhenqiang@hotmail.com&gt;; Fengwei=
 Qin
 &lt;qinfengwei@chinamobile.com&gt;; Stewart Bryant &lt;stewart.bryant@gmai=
l.com&gt;; Yongqing Zhu &lt;zhuyq.gd@chinatelecom.cn&gt;; Dongjie (Jimmy) &=
lt;jie.dong@huawei.com&gt;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Subject: New Version Notifica=
tion for draft-dong-spring-sr-for-enhanced-vpn-05.txt<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">A new version of I-D, draft-d=
ong-spring-sr-for-enhanced-vpn-05.txt<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">has been successfully submitt=
ed by Jie Dong and posted to the IETF repository.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Name: draft-dong-spring-sr-fo=
r-enhanced-vpn<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Revision: 05<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Title: Segment Routing for En=
hanced VPN Service<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Document date: 2019-10-16<o:p=
></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Group: Individual Submission<=
o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Pages: 20<o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">URL:&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; https://www.ietf.org/internet-dra=
fts/draft-dong-spring-sr-for-enhanced-vpn-05.txt<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Status:&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; https://datatracker.ietf.org/doc/draft-dong-spri=
ng-sr-for-enhanced-vpn/<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Htmlized:&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; https://tools.ietf.org/html/draft-dong-spring-sr-for-enhan=
ced-vpn-05<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Htmlized:&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; https://datatracker.ietf.org/doc/html/draft-dong-spring-sr=
-for-enhanced-vpn<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Diff:&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; https://www.ietf.org/rfcdiff?url2=3Ddr=
aft-dong-spring-sr-for-enhanced-vpn-05<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Abstract:<o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; Enhanced VPN (VP=
N&#43;) is an enhancement to VPN services to enable it to<o:p></o:p></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; support the need=
s of new applications, particularly applications that<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; are associated w=
ith 5G services.&nbsp; These applications require better<o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; isolation from b=
oth control and data plane's perspective and have<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; more stringent p=
erformance requirements than can be provided with<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; overlay VPNs.&nb=
sp; The characteristics of an enhanced VPN as perceived by<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; its tenant needs=
 to be comparable to those of a dedicated private<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; network.&nbsp; T=
his requires tight integration between the overlay VPN and<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; the underlay net=
work topology and resources in a scalable manner.&nbsp; An<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; enhanced VPN may=
 form the underpinning of 5G network slicing, but<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; will also be of =
use in its own right.&nbsp; This document describes how to<o:p></o:p></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; use segment rout=
ing based mechanisms to provide the enhanced VPN<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; service with the=
 required network topology and resources.&nbsp; The<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; overall mechanis=
m of providing segment routing based enhanced VPN<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; service is also =
described.&nbsp; The proposed mechanism is applicable to<o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; both segment rou=
ting with MPLS data plane (SR-MPLS) and segment<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp; routing with IPv=
6 data plane (SRv6).<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">Please note that it may take =
a couple of minutes from the time of submission until the htmlized version
 and diff are available at tools.ietf.org.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">The IETF Secretariat<o:p></o:=
p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">_____________________________=
__________________<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">spring mailing list<o:p></o:p=
></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">spring@ietf.org<o:p></o:p></s=
pan></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;????&quot;,&quot;serif&quot;;mso-fareast-font-fa=
mily:&quot;Times New Roman&quot;;color:black">https://www.ietf.org/mailman/=
listinfo/spring<o:p></o:p></span></p>
</div>
</div>
</blockquote>
</div>
<PRE>______________________________________________________________________=
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From: Shraddha Hegde <shraddha@juniper.net>
To: Susan Hares <shares@ndzh.com>, 'idr wg' <idr@ietf.org>, 'SPRING WG List' <spring@ietf.org>
Thread-Topic: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/jixY9SjH67AavDq_NDsYmZo4pQo>
Subject: Re: [spring] [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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I support the adoption of both drafts.


Rgds
Shraddha

From: Idr <idr-bounces@ietf.org> On Behalf Of Susan Hares
Sent: Monday, October 14, 2019 11:43 PM
To: 'idr wg' <idr@ietf.org>; 'SPRING WG List' <spring@ietf.org>
Subject: Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.=
txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to=
 10/21/2019]

Greetings IDR and Spring WG

The WG Adoption for the two IDR drafts related to IDR received a level supp=
ort below the threshold to accept this draft into the IDR WG.  There were n=
o objection, but there was simply a low level of response.

This 1 week extension to the Adoption call is to let the members of both th=
e IDR and SPRING WG comment on whether these drafts have matured enough to =
be IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination =
of whether either of these two drafts have enough support to be accepted.

Thank you,  Susan  Hares
IDR co-chair

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt =
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

This begins a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019=
]

  *   draft-li-bgp-ls-sr-policy-path-segment-03.txt and
  *   draft-li-idr-sr-policy-path-segment-01.txt.

You can access these two drafts at the following location:

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment=
/<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-li-idr-=
bgp-ls-sr-policy-path-segment/__;!8WoA6RjC81c!Wz7b25P3MjEHNnuIJlISWoZ6ixJ43=
9lDVO5kS5HFr5fxrtGr07gJ6yZJJvkoqyV8$>

https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/<https=
://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-li-idr-sr-poli=
cy-path-segment/__;!8WoA6RjC81c!Wz7b25P3MjEHNnuIJlISWoZ6ixJ439lDVO5kS5HFr5f=
xrtGr07gJ6yZJJhIezQzQ$>

The authors have pointed out that the adoption of this
draft since the following  SR-MPLS Path Segment draft has been adopted:

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00<https://=
urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-mpls-path-=
segment-00__;!8WoA6RjC81c!Wz7b25P3MjEHNnuIJlISWoZ6ixJ439lDVO5kS5HFr5fxrtGr0=
7gJ6yZJJrFqQvFw$>

Please consider the following questions in your responses?


  1.  Should this SR Policy technology be included in BGP for SR-MPLS



Spring has adopted the draft, but IDR can provide feedback

to spring about putting this technology in BGP.


  1.  Is this technology a good way to implement the required

Features in BGP?



  1.  Is this technology ready for adoption?



  1.  Do you have any concerns about adopting this technology?



Cheers, Susan Hares

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<div class=3D"WordSection1">
<p class=3D"MsoNormal">I support the adoption of both drafts.<o:p></o:p></p=
>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Rgds<o:p></o:p></p>
<p class=3D"MsoNormal">Shraddha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Idr &lt;idr-bounces@ietf.org&gt; <b>On =
Behalf Of </b>
Susan Hares<br>
<b>Sent:</b> Monday, October 14, 2019 11:43 PM<br>
<b>To:</b> 'idr wg' &lt;idr@ietf.org&gt;; 'SPRING WG List' &lt;spring@ietf.=
org&gt;<br>
<b>Subject:</b> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segm=
ent-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [1=
0/14 to 10/21/2019]<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Greetings IDR and Spri=
ng WG<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">The WG Adoption for th=
e two IDR drafts related to IDR received a level support below the threshol=
d to accept this draft into the IDR WG.&nbsp; There were no objection, but =
there was simply a low level of response.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">This 1 week extension =
to the Adoption call is to let the members of both the IDR and SPRING WG co=
mment on whether these drafts have matured enough to be IDR WG drafts. &nbs=
p;On 10/21/2019, the IDR chairs will make
 a determination of whether either of these two drafts have enough support =
to be accepted.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thank you,&nbsp; Susan=
&nbsp; Hares<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">IDR co-chair <o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,sans-serif">From:</span></b><span style=3D"font-size:10.0pt;f=
ont-family:&quot;Tahoma&quot;,sans-serif"> Idr [<a href=3D"mailto:idr-bounc=
es@ietf.org">mailto:idr-bounces@ietf.org</a>]
<b>On Behalf Of </b>Susan Hares<br>
<b>Sent:</b> Tuesday, September 17, 2019 12:35 PM<br>
<b>To:</b> 'idr wg'<br>
<b>Subject:</b> [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-=
03.txt and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This begins a 2 week WG Adoption call two related dr=
afts [9/17 to 10/1/2019]
<o:p></o:p></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:2.25pt;mso-list:l1 leve=
l1 lfo2">draft-li-bgp-ls-sr-policy-path-segment-03.txt and
<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:2.25pt;=
mso-list:l1 level1 lfo2">draft-li-idr-sr-policy-path-segment-01.txt.
<o:p></o:p></li></ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">You can access these two drafts at the following loc=
ation: <o:p>
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://urldefense.com/v3/__https:/datatr=
acker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/__;!8WoA6RjC8=
1c!Wz7b25P3MjEHNnuIJlISWoZ6ixJ439lDVO5kS5HFr5fxrtGr07gJ6yZJJvkoqyV8$">https=
://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/</a>=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://urldefense.com/v3/__https:/datatr=
acker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/__;!8WoA6RjC81c!Wz7b=
25P3MjEHNnuIJlISWoZ6ixJ439lDVO5kS5HFr5fxrtGr07gJ6yZJJhIezQzQ$">https://data=
tracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/</a><o:p></o:p></p=
>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The authors have pointed out that the adoption of th=
is <o:p>
</o:p></p>
<p class=3D"MsoNormal">draft since the following &nbsp;SR-MPLS Path Segment=
 draft has been adopted:
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://urldefense.com/v3/__https:/tools.=
ietf.org/html/draft-ietf-spring-mpls-path-segment-00__;!8WoA6RjC81c!Wz7b25P=
3MjEHNnuIJlISWoZ6ixJ439lDVO5kS5HFr5fxrtGr07gJ6yZJJrFqQvFw$">https://tools.i=
etf.org/html/draft-ietf-spring-mpls-path-segment-00</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please consider the following questions in your resp=
onses? <o:p>
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ol style=3D"margin-top:0in" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo4">Should this SR Policy technology be included in BGP for SR-MPLS
<o:p></o:p></li></ol>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph">Spring has adopted the draft, but IDR can pro=
vide feedback
<o:p></o:p></p>
<p class=3D"MsoListParagraph">to spring about putting this technology in BG=
P.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ol style=3D"margin-top:0in" start=3D"2" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo4">Is this technology a good way to implement the required
<o:p></o:p></li></ol>
<p class=3D"MsoListParagraph">Features in BGP? <o:p></o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<ol style=3D"margin-top:0in" start=3D"3" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo4">Is this technology ready for adoption?
<o:p></o:p></li></ol>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<ol style=3D"margin-top:0in" start=3D"4" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 =
lfo4">Do you have any concerns about adopting this technology?
<o:p></o:p></li></ol>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Cheers, Susan Hares <o:p></o:p></p>
</div>
</body>
</html>

--_000_BYAPR05MB3943C4DC54FFF17FD326CED1D56B0BYAPR05MB3943namp_--


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From: <bruno.decraene@orange.com>
To: SPRING WG List <spring@ietf.org>
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Thread-Topic: IETF 106 - SPRING agenda
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Subject: [spring] IETF 106 - SPRING agenda
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Hi SPRING,



The preliminary IETF meeting agenda is at https://datatracker.ietf.org/meet=
ing/106/agenda.html .



For IETF 106, we're scheduled to meet twice:

13:30-15:30    Monday Afternoon session I

15:50-17:20    Thursday Afternoon session II





Rob and I would like to ask folks to send requests for presentation slots

in the SPRING meeting. Please indicate:



   - the name of the draft you'd like to present,

   - the speaker's name,

   - the amount of time you would like to be allotted - this should cover

   *both* your presentation and discussion.



If you're planning to present a new non-working group draft, please first

post it to the list. If you're presenting an update to an existing draft,

please send an update mail to the list highlighting the

changes that you've made.



There's a handy check-list for presenting at a SPRING meeting on the wiki

https://trac.ietf.org/trac/spring/wiki/Checklist%20for%20presenting%20at%20=
a%20SPRING%20meeting .



We tend to be oversubscribed on meeting agenda slots -- please consider

carefully whether there are items in your update that really benefit from

face-to-face discussion. If the draft has simply been refreshed since last

time it was presented, with no material changes, please consider not

requesting a slot to make our lives easier!



Please have your requests to us by Friday 2019-11-01. We'd like your

slides *Sunday* November 17th at 10:00 local time at the very latest to giv=
e us time

to be able to put together the materials for remote participants.



Thanks,

Rob & Bruno,


___________________________________________________________________________=
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<div class=3D"WordSection1">
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">Hi SPRING,<o:p>=
</o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">The preliminary=
 IETF meeting agenda is at </span><a href=3D"https://datatracker.ietf.org/m=
eeting/106/agenda.html"><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-=
US">https://datatracker.ietf.org/meeting/106/agenda.html</span></a><span st=
yle=3D"mso-ansi-language:EN-US"> <span lang=3D"EN-US">.<o:p></o:p></span></=
span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">For IETF 106, w=
e're scheduled to meet twice:<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">13:30-15:30 <sp=
an style=3D"mso-tab-count:1">&nbsp;&nbsp; </span>Monday Afternoon session I=
<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">15:50-17:20 <sp=
an style=3D"mso-tab-count:1">&nbsp;&nbsp; </span>Thursday Afternoon session=
 II<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">Rob and I would=
 like to ask folks to send requests for presentation slots<o:p></o:p></span=
></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">in the SPRING m=
eeting. Please indicate:<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><span style=3D"=
mso-spacerun:yes">&nbsp;&nbsp; </span>- the name of the draft you'd like to=
 present,<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><span style=3D"=
mso-spacerun:yes">&nbsp;&nbsp; </span>- the speaker's name,<o:p></o:p></spa=
n></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><span style=3D"=
mso-spacerun:yes">&nbsp;&nbsp; </span>- the amount of time you would like t=
o be allotted - this should cover<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><span style=3D"=
mso-spacerun:yes">&nbsp;&nbsp; </span>*both* your presentation and discussi=
on.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">If you're plann=
ing to present a new non-working group draft, please first<o:p></o:p></span=
></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">post it to the =
list. If you're presenting an update to an existing draft,<o:p></o:p></span=
></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">please send an =
update mail to the list highlighting the<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">changes that yo=
u've made.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">There's a handy=
 check-list for presenting at a SPRING meeting on the wiki<o:p></o:p></span=
></pre>
<pre><span lang=3D"EN-US" style=3D"mso-fareast-font-family:Calibri;mso-ansi=
-language:EN-US"><a href=3D"https://trac.ietf.org/trac/spring/wiki/Checklis=
t%20for%20presenting%20at%20a%20SPRING%20meeting">https://trac.ietf.org/tra=
c/spring/wiki/Checklist%20for%20presenting%20at%20a%20SPRING%20meeting</a> =
</span><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">.<o:p></o:p><=
/span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">We tend to be o=
versubscribed on meeting agenda slots -- please consider<o:p></o:p></span><=
/pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">carefully wheth=
er there are items in your update that really benefit from<o:p></o:p></span=
></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">face-to-face di=
scussion. If the draft has simply been refreshed since last<o:p></o:p></spa=
n></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">time it was pre=
sented, with no material changes, please consider not<o:p></o:p></span></pr=
e>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">requesting a sl=
ot to make our lives easier!<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">Please have you=
r requests to us by Friday 2019-11-01. We'd like your<o:p></o:p></span></pr=
e>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">slides *<b>Sund=
ay</b>* November 17th at 10:00 local time at the very latest to give us tim=
e<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">to be able to p=
ut together the materials for remote participants.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span class=3D"SpellE">Thanks</span>,<o:p></o:p></pre>
<pre>Rob &amp; Bruno,<o:p></o:p></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Rishabh Parekh (riparekh)" <riparekh@cisco.com>
CC: "spring@ietf.org" <spring@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "zzhang@juniper.net" <zzhang@juniper.net>, "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>
Thread-Topic: Some questions regarding Replication SID
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Subject: Re: [spring] Some questions regarding Replication SID
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--_000_AM0PR03MB38282952E9220FA8FD7C1D579D6A0AM0PR03MB3828eurp_
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Rishabh,
Again lots of thanks for a prompt and very informative response.

My problem with this response that, from my POV, you implicitly define two=
 different flavors of the Replication SID:

-          One of these flavors MUST be instantiated both in the Replicati=
on Node and in the Downstream nodes, so that it CONTINUEs in each specific=
 Replication Branch

-          The other flavor MUST NOT be instantiated in the Replication No=
de bot MUST NOT be instantiated in the Downstream nodes so that the Replic=
ation Node treats it as NEXT in each Replication branch.

I understand why each of these flavors may be useful,. However, with the d=
ifference being implicit, this is apt to raise some issues, e.g.: can the =
same Replication SID be treated by the Replication Bode as CONTINUE in som=
e of its Replication Branches and as NEXT - in some other ones? Unless I h=
ave missed something, nothing in the current text of the draft prevents su=
ch a mix. Is this indeed your intention?

BTW, the MVPN Aggregation Label draft<https://tools.ietf.org/html/draft-ie=
tf-bess-mvpn-evpn-aggregation-label-02> that you have mentioned has expire=
d. Do you happen know if the authors intend to revive it?

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: Rishabh Parekh (riparekh) <riparekh@cisco.com>
Sent: Tuesday, October 22, 2019 8:25 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com>; ho=
oman.bidgoli@nokia.com; zzhang@juniper.net; daniel.voyer@bell.ca
Subject: RE: Some questions regarding Replication SID

Sasha,

This looks inconsistent to me because a Replication SID as defined in this=
 draft is instantiated both in the Replication node and in the Downstream =
nodes while the Tree-SID does not require instantiation in the Leaf nodes =
(this is optional).
[RP]Replication segment draft describes how a *single* Replication segment=
 can be used for a Multi-point service. In that case, the Replication SID =
at downstream nodes (which are the Leaf nodes of the service) is used to d=
erive service context. The P2MP policy draft  makes Replication segments a=
t Leaf nodes OPTIONAL when it is possible to derive service context from s=
ome other information in the packet. Thinking more about this, even for th=
e single Replication segment, it might be possible to avoid instantiation =
at Downstream nodes when service context can be derived from some other in=
formation in the packet. We might consider this for next revision.
[[Sasha]] I am confused now. From my POV either the Replication SID MUST b=
e represented both in the Replication node and in all Downstream nodes, or=
 it MUST be local for the Replication Node only. In the first case its han=
dling effectively is CONTINUE in each Replication Branch, in the second ca=
se it is NEXT in each Replication Branch. I do not see how you can have tw=
o different kinds of handling for the same type of SID.

I definitely did not intend to confuse you! Sometimes such discussion can =
get quite esoteric and written word (as compared to say whiteboard diagram=
) is not the best medium, but let me try to clarify. If you wish, we can s=
chedule a conference call to discuss further.

Typically, for any multicast transport, it is not possible to carry a down=
stream assigned service context (VPN label) in the label stack (since it i=
s difficult to orchestrate all the Leaf nodes to assign same value for the=
 context). So, the transport label (Replication SID) is used to derive the=
 service context. This requires Replication SID to be instantiated on the =
Leaf nodes and as you say, the Replication node performs CONTINUE operatio=
n. However, if the service context can be assigned globally (for e.g. DCB =
from https://tools.ietf.org/html/draft-ietf-bess-mvpn-evpn-aggregation-lab=
el-02<https://clicktime.symantec.com/32QsG9Cr65bx26TTfRS6U876H2?u=3Dhttps%=
3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-bess-mvpn-evpn-aggregation-labe=
l-02>), then Replication SID is not strictly required at Leaf nodes and th=
erefore Replication node can perform NEXT operation. Some of these details=
 are covered in Section 2.1 of the P2MP policy draft.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Tuesday, October 22, 2019 7:30 AM
To: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.co=
m>>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Clarence Filsfils (cfilsfil) =
<cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<=
mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper=
.net>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Subject: RE: Some questions regarding Replication SID


Rishabh,
Lots of thanks for a prompt response and apologies for the delays.

Please see more inline below.
Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>

From: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.=
com>>
Sent: Thursday, October 17, 2019 9:38 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexande=
r.Vainshtein@ecitele.com>>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Clarence Filsfils (cfilsfil) =
<cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<=
mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper=
.net>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Subject: RE: Some questions regarding Replication SID

Sasha,


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you=
 point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) th=
at represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actua=
lly I wanted to ask whether the SIDs in the list that represent a specific=
 Replication Branch are the SIDs defined in RFC 8204. The text I see in th=
e SR P2MP Policy<https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6H2=
?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-policy-=
00> draft seems to suggest that it is not necessarily so  because a Tree-S=
ID is considered also as the Replication SID. This looks inconsistent to m=
e because a Replication SID as defined in this draft is instantiated both =
in the Replication node and in the Downstream nodes while the Tree-SID doe=
s not require instantiation in the Leaf nodes (this is optional).

[RP]I am not sure I completely understand your questions above. Let's brea=
k them down and see if my responses clarify them:
Actually I wanted to ask whether the SIDs in the list that represent a spe=
cific Replication Branch are the SIDs defined in RFC 8204
[RP] I think my responses to questions 2 and 3 in your original e-mail sho=
uld make this clear. Let me know if it is not.

The text I see in the SR P2MP Policy<https://clicktime.symantec.com/3KYcTh=
6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer=
-pim-sr-p2mp-policy-00> draft seems to suggest that it is not necessarily =
so  because a Tree-SID is considered also as the Replication SID.
[RP]SR P2MP Policy draft specifies a way to create P2MP trees by stitching=
 Replication Segments together. The Replication SID of the Replication seg=
ment at root of a tree is called Tree-SID since this SID allows packets to=
 be replicated across the tree.

This looks inconsistent to me because a Replication SID as defined in this=
 draft is instantiated both in the Replication node and in the Downstream =
nodes while the Tree-SID does not require instantiation in the Leaf nodes =
(this is optional).
[RP]Replication segment draft describes how a *single* Replication segment=
 can be used for a Multi-point service. In that case, the Replication SID =
at downstream nodes (which are the Leaf nodes of the service) is used to d=
erive service context. The P2MP policy draft  makes Replication segments a=
t Leaf nodes OPTIONAL when it is possible to derive service context from s=
ome other information in the packet. Thinking more about this, even for th=
e single Replication segment, it might be possible to avoid instantiation =
at Downstream nodes when service context can be derived from some other in=
formation in the packet. We might consider this for next revision.
[[Sasha]] I am confused now. From my POV either the Replication SID MUST b=
e represented both in the Replication node and in all Downstream nodes, or=
 it MUST be local for the Replication Node only. In the first case its han=
dling effectively is CONTINUE in each Replication Branch, in the second ca=
se it is NEXT in each Replication Branch. I do not see how you can have tw=
o different kinds of handling for the same type of SID.



[RP] You are right in that it does not matter how Replication segment is i=
nstantiated at a node. The use of PCE is relevant for SR P2MP Policy<https=
://clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PC=
E instantiates Replication segments.[[Sasha]] OK, I will  look up the seco=
nd draft. BTW, it does not appear as a reference in this one - is it inten=
tional?
[RP]The P2MP policy draft uses Replication segment draft as a base, but it=
 is not the other way around. We can add a Informative reference in next r=
evision if you think it will help.[[Sasha]] It would help IMHO.


1. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of =
SR is to simplify. The idea is same here - use replication segments to rea=
lize P2MP trees computed by PCE (without need of multicast protocols) as s=
pecified in SR P2MP draft[[Sasha]] One of the well-known aspects that make=
 multicast different is that the traffic in the Service Provider domain is=
 driven by the dynamic customer requests. Handling these requests via a PC=
E looks problematic to me.
[RP]SR P2MP MVPN<https://clicktime.symantec.com/329erDXYCoUNudUpd4NoApR6H2=
?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-parekh-bess-mvpn-sr-=
p2mp%2F> draft,  which will be updated soon, specifies procedures for dyna=
mic updates SR P2MP trees using BGP MVPN; this includes dampening procedur=
es to control interaction between PCC (root of tree) and PCE.
[[Sasha]] I will look up this draft as well.

Pleade note that if the anser to #3 in my original message is positive, th=
en the statement in the draft that say the Replication Segment is similar =
to the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the =
Replication segment at Root (or Headend) node can be used as a (constant) =
Binding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and th=
e Replication SID as defined here is that the former is instantiated just =
locally while the Replication SID is instantiated both in the Replication =
node and in the Downstream nodes.
[RP]Here we use "Binding SID" to denote that fact that Replication SID (or=
 Tree-SID for P2MP trees) at the Root MAY be used as a constant SID that a=
llows packets to be steered into a Replication segment or a P2MP tree. Not=
e the drafts do not exclude the possibility that Replication SIDs at downs=
tream nodes or non-Root Replication segments can change.[[Sasha]] Please s=
ee above.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Wednesday, October 16, 2019 10:26 PM
To: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.co=
m>>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Clarence Filsfils (cfilsfil) =
<cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<=
mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper=
.net>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Subject: RE: Some questions regarding Replication SID

Re-sending with corrected To and CC lists...

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>

From: Alexander Vainshtein
Sent: Thursday, October 17, 2019 8:25 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Rishabh Parekh (riparekh) <ri=
parekh@cisco.com<mailto:riparekh@cisco.com>>; Clarence Filsfils (cfilsfil)=
 <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com=
<mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@junipe=
r.net>
Subject: RE: Some questions regarding Replication SID

Rishabh,
Lots of thanks for a prompt and detailed response.

Please see more inline below.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>

From: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.=
com>>
Sent: Thursday, October 17, 2019 1:24 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexande=
r.Vainshtein@ecitele.com>>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.=
ca>; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisc=
o.com>>; hooman.bidgoli@nokia.com<mailto:hooman.bidgoli@nokia.com>; zzhang=
@juniper.net<mailto:zzhang@juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: RE: Some questions regarding Replication SID

Alexander,
Responses to your queries are prefaced with [RP].


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you=
 point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) th=
at represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actua=
lly I wanted to ask whether the SIDs in the list that represent a specific=
 Replication Branch are the SIDs defined in RFC 8204. The text I see in th=
e SR P2MP Policy<https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6H2=
?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-policy-=
00> draft seems to suggest that it is not necessarily so  because a Tree-S=
ID is considered also as the Replication SID. This looks inconsistent to m=
e because a Replication SID as defined in this draft is instantiated both =
in the Replication node and in the Downstream nodes while the Tree-SID doe=
s not require instantiation in the Leaf nodes (this is optional).



2. The draft also says that "A Replication branch to a particular Downstre=
am Node could be represented by the node's Node SID".  Does this mean that=
 the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node =
SID as the active segment across such a replication branch?

[RP] No, Replication SID relevant at a downstream node would be the bottom=
 label with other SIDs stacked on top which would guide the packet to the =
downstream node. Of course, if the Downstream node is adjacent to the Repl=
ication node, only the Replication SID would be present in the outgoing pa=
cket.[[Sasha]] OK, thanks.



3. The draft also says that "Replication segment is instantiated at Downst=
ream nodes and at the Replication node".  Does that mean that the list of =
SIDs associated with the specific replication Branch is pushed by the Repl=
ication Node on top of the label representing the Replication SID in the D=
ownstream node of this branch?

[RP] Yes. See response to 2 above.[[Sasha]] OK, thanks again.



4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

[RP] Since the Replication SID is locally relevant at a node, the Replicat=
ion SID would be downstream-allocated. However, it may also be allocated b=
y PCE; see response to 5, 6 below.[[Sasha]] OK, thanks.



5. The draft also says that  "A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE". These two options look exac=
tly the same to me from the POV of the node on which the Replication segme=
nt is programmed - what, if anything, did I miss?

[RP] You are right in that it does not matter how Replication segment is i=
nstantiated at a node. The use of PCE is relevant for SR P2MP Policy<https=
://clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PC=
E instantiates Replication segments.[[Sasha]] OK, I will  look up the seco=
nd draft. BTW, it does not appear as a reference in this one - is it inten=
tional?



6. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of =
SR is to simplify. The idea is same here - use replication segments to rea=
lize P2MP trees computed by PCE (without need of multicast protocols) as s=
pecified in SR P2MP draft[[Sasha]] One of the well-known aspects that make=
 multicast different is that the traffic in the Service Provider domain is=
 driven by the dynamic customer requests. Handling these requests via a PC=
E looks problematic to me.



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be highly appreciated.

[RP]SR P2MP policy draft lists different protocols (PCEP, BGP, etc.) that =
can be used to instantiate Replication segments. SR P2MP PCEP<https://clic=
ktime.symantec.com/3JuFtE8qkd9Viz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf=
.org%2Fhtml%2Fdraft-dhs-spring-pce-sr-p2mp-policy-00> would be updated; ot=
her drafts will be published in future.


More of the same...
Pleade note that if the anser to #3 in my original message is positive, th=
en the statement in the draft that say the Replication Segment is similar =
to the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the =
Replication segment at Root (or Headend) node can be used as a (constant) =
Binding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and th=
e Replication SID as defined here is that the former is instantiated just =
locally while the Replication SID is instantiated both in the Replication =
node and in the Downstream nodes.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Tuesday, October 15, 2019 6:31 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>; Clarence Filsfils (=
cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; Rishabh Parekh =
(riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.com>>; hooman.bidgoli=
@nokia.com<mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzh=
ang@juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: Some questions regarding Replication SID

Dear colleagues,
I have read the Replication SID draft<https://clicktime.symantec.com/3G11J=
yktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voye=
r-spring-sr-replication-segment-00>, and I have a few questions dealing wi=
th possible instantiation of the Replication SOD in SR-MPLS<https://clickt=
ime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dhttps%3A%2F%2Ftools.ietf.o=
rg%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpls-22>.


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

2. The draft also says that "A Replication branch to a particular Downstre=
am Node could be represented by the node's Node SID".  Does this mean that=
 the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node =
SID as the active segment across such a replication branch?

3. The draft also says that "Replication segment is instantiated at Downst=
ream nodes and at the Replication node".  Does that mean that the list of =
SIDs associated with the specific replication Branch is pushed by the Repl=
ication Node on top of the label representing the Replication SID in the D=
ownstream node of this branch?

4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

5. The draft also says that  "A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE". These two options look exac=
tly the same to me from the POV of the node on which the Replication segme=
nt is programmed - what, if anything, did I miss?

6. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>


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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Again lots of thanks =
for a prompt and very informative response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">My problem with this =
response that, from my POV, you
<b><i>implicitly</i></b> define two different flavors of the Replication S=
ID:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 lev=
el1 lfo9"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D=
"mso-list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">One of these flavors MUST be instantiated both in the Replicat=
ion Node and in the Downstream nodes, so that it CONTINUEs in each specifi=
c Replication Branch<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 lev=
el1 lfo9"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D=
"mso-list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">The other flavor MUST NOT be instantiated in the Replication N=
ode bot MUST NOT be instantiated in the Downstream nodes so that the Repli=
cation Node treats it as NEXT in each Replication
 branch.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I understand why each=
 of these flavors may be useful,. However, with the difference being impli=
cit, this is apt to raise some issues, e.g.: can the same Replication SID =
be treated by the Replication Bode as CONTINUE
 in some of its Replication Branches and as NEXT &#8211; in some other one=
s? Unless I have missed something, nothing in the current text of the draf=
t prevents such a mix. Is this indeed your intention?<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">BTW, the <a href=3D"h=
ttps://tools.ietf.org/html/draft-ietf-bess-mvpn-evpn-aggregation-label-02"=
>
MVPN Aggregation Label draft</a> that you have mentioned has expired. Do y=
ou happen know if the authors intend to revive it?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; Al=
exander.Vainshtein@ecitele.com<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;riparekh=
@cisco.com&gt; <br>
<b>Sent:</b> Tuesday, October 22, 2019 8:25 PM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;<b=
r>
<b>Cc:</b> spring@ietf.org; Clarence Filsfils (cfilsfil) &lt;cfilsfil@cisc=
o.com&gt;; hooman.bidgoli@nokia.com; zzhang@juniper.net; daniel.voyer@bell=
.ca<br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Sash=
a,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">This looks inco=
nsistent to me=20because a Replication SID as defined in this draft is ins=
tantiated both in the Replication node and in the Downstream nodes while t=
he Tree-SID does not require instantiation
 in the Leaf nodes (this is optional).</span></i></b><span style=3D"font-s=
ize:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
Replication segment draft describes how a *<b>single</b>* Replication segm=
ent can be used for a Multi-point service. In that case, the Replication S=
ID at downstream nodes (which are the Leaf
 nodes of the service) is used to derive service context. The P2MP policy =
draft&nbsp; makes Replication segments at Leaf nodes OPTIONAL when it is p=
ossible to derive service context from some other information in the packe=
t. Thinking more about this, even for the
 single Replication segment, it might be possible to avoid instantiation a=
t Downstream nodes when service context can be derived from some other inf=
ormation in the packet. We might consider this for next revision.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B050">[[Sasha]] I am =
confused now. From my POV either the Replication SID MUST be represented b=
oth in the Replication node and in all Downstream nodes, or it MUST be loc=
al for the Replication Node only. In the
 first case its handling effectively is CONTINUE in each Replication Branc=
h, in the second case it is NEXT in each Replication Branch. I do not see =
how you can have two different kinds of handling for the same type of SID.=

</span></i></b><span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">I de=
finitely did not intend to confuse you! Sometimes such discussion can get =
quite esoteric and written word (as compared to say whiteboard diagram) is=
 not the best medium, but let me try to
 clarify. If you wish, we can schedule a conference call to discuss furthe=
r.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Typi=
cally, for any multicast transport, it is not possible to carry a downstre=
am assigned service context (VPN label) in the label stack (since it is di=
fficult to orchestrate all the Leaf nodes
 to assign same value for the context). So, the transport label (Replicati=
on SID) is used to derive the service context. This requires Replication S=
ID to be instantiated on the Leaf nodes and as you say, the Replication no=
de performs CONTINUE operation. However,
 if the service context can be assigned globally (for e.g. DCB from <a hre=
f=3D"https://clicktime.symantec.com/32QsG9Cr65bx26TTfRS6U876H2?u=3Dhttps%3=
A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-bess-mvpn-evpn-aggregation-label=
-02">
https://tools.ietf.org/html/draft-ietf-bess-mvpn-evpn-aggregation-label-02=
</a>), then Replication SID is not strictly required at Leaf nodes and the=
refore Replication node can perform NEXT operation. Some of these details =
are covered in Section 2.1 of the P2MP
 policy draft.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Ris=
habh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Tuesday, October 22, 2019 7:30 AM<br>
<b>To:</b> Rishabh Parekh (riparekh) &lt;<a href=3D"mailto:riparekh@cisco.=
com">riparekh@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Clarenc=
e Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@c=
isco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a>; <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voy=
er@bell.ca</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a =
prompt response and apologies for the delays.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please see more </spa=
n><b><i><span style=3D"color:#00B050">inline below</span></i></b><span sty=
le=3D"color:#1F497D">.<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </=
span><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainsht=
ein@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;<a href=3D=
"mailto:riparekh@cisco.com">riparekh@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 9:38 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Clarenc=
e Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@c=
isco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a>; <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voy=
er@bell.ca</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Sash=
a,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l2 level1 lfo2"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that &#=
8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;=
Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, Dow=
nstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that the=
 </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Cour=
ier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of </span><a href=3D=
"https://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F=
%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">RFC8402</span></a><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">?<o:p></o:p></sp=
an></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID not a topological SID as defined the sections you point to in =
RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that represents=
 the Replication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </=
span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the =
process of writing. Actually I wanted to ask whether the SIDs in the list =
that represent a specific Replication Branch are the SIDs defined in RFC 8=
204. The text I see in the </span></i></b><a href=3D"https://clicktime.sym=
antec.com/3KYcTh6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fht=
ml%2Fdraft-voyer-pim-sr-p2mp-policy-00"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span></i><=
/b></a><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quo=
t;,sans-serif;color:#1F497D"> </span></i></b><b><i><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B0F0">draft s=
eems to suggest that it is not necessarily so &nbsp;because a Tree-SID is =
considered also as the Replication SID. This looks inconsistent to me beca=
use a Replication SID as defined in this draft is instantiated both in the=
 Replication node and in the Downstream nodes while the Tree-SID does not =
require instantiation in the Leaf nodes (this is optional). </span></i></b=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f;color:#1F497D"><o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
I am not sure I completely understand your questions above. Let&#8217;s br=
eak them down and see if my responses clarify them:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">Actually I want=
ed to ask whether the SIDs in the list that represent a specific Replicati=
on Branch are the SIDs defined in RFC 8204</span></i></b><span style=3D"fo=
nt-size:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
 I think my responses to questions 2 and 3 in your original e-mail should =
make this clear. Let me know if it is not.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">The text I see =
in the </span>
</i></b><a href=3D"https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6=
H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-polic=
y-00"><b><i>SR P2MP Policy</i></b></a><b><i><span style=3D"color:#1F497D">=

</span><span style=3D"color:#00B0F0">draft seems to suggest that it is not=
 necessarily so &nbsp;because a Tree-SID is considered also as the Replica=
tion SID.</span></i></b><span style=3D"font-size:10.0pt;color:#1F497D"><o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
SR P2MP Policy draft specifies a way to create P2MP trees by stitching Rep=
lication Segments together. The Replication SID of the Replication segment=
 at root of a tree is called Tree-SID since
 this SID allows packets to be replicated across the tree.<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">This looks inco=
nsistent to me because a Replication SID as defined in this draft is insta=
ntiated both in the Replication node and in the Downstream nodes while the=
 Tree-SID does not require instantiation
 in the Leaf nodes (this is optional).</span></i></b><span style=3D"font-s=
ize:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
Replication segment draft describes how a *<b>single</b>* Replication segm=
ent can be used for a Multi-point service. In that case, the Replication S=
ID at downstream nodes (which are the Leaf
 nodes of the service) is used to derive service context. The P2MP policy =
draft&nbsp; makes Replication segments at Leaf nodes OPTIONAL when it is p=
ossible to derive service context from some other information in the packe=
t. Thinking more about this, even for the
 single Replication segment, it might be possible to avoid instantiation a=
t Downstream nodes when service context can be derived from some other inf=
ormation in the packet. We might consider this for next revision.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B050">[[Sasha]] I am =
confused now. From my POV either the Replication SID MUST be represented b=
oth in the Replication node and in all Downstream nodes, or it MUST be loc=
al for the Replication Node only. In the
 first case its handling effectively is CONTINUE in each Replication Branc=
h, in the second case it is NEXT in each Replication Branch. I do not see =
how you can have two different kinds of handling for the same type of SID.=

</span></i></b><span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are =
right in that it does not matter how Replication segment is instantiated a=
t a node. The use of PCE is relevant for </span><a href=3D"https://clickti=
me.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ie=
tf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F"><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span><=
/a><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-se=
rif"> draft where PCE instantiates Replication segments<span style=3D"colo=
r:#00B0F0">.<b><i>[[Sasha]] OK, I will &nbsp;look up the second draft. BTW=
, it does not appear as a reference in this one &#8211; is it intentional?=
</i></b> <o:p></o:p></span></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
The P2MP policy draft uses Replication segment draft as a base, but it is =
not the other way around. We can add a Informative reference in next revis=
ion if you think it will help</span><span style=3D"font-size:10.0pt;color:=
#00B050">.<b><i>[[Sasha]]
 It would help IMHO.</i></b></span><span style=3D"font-size:10.0pt;color:#=
1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do =
not strictly preclude any protocol , but one of the goals of SR is to simp=
lify. The idea is same here - use replication segments to realize P2MP tre=
es computed by PCE (without need of multicast protocols) as specified in S=
R P2MP draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-=
known aspects that make multicast different is that the traffic in the Ser=
vice Provider domain is driven by the dynamic customer requests. Handling =
these requests via a PCE looks problematic=20to me. </span></i></b><span s=
tyle=3D"color:#00B0F0"><o:p></o:p></span></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
</span><a href=3D"https://clicktime.symantec.com/329erDXYCoUNudUpd4NoApR6H=
2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-parekh-bess-mvpn-sr=
-p2mp%2F"><span style=3D"font-size:10.0pt">SR
 P2MP MVPN</span></a><span style=3D"font-size:10.0pt;color:#1F497D"> draft=
,&nbsp; which will be updated soon, specifies procedures for dynamic updat=
es SR P2MP trees using BGP MVPN; this includes dampening procedures to con=
trol interaction between PCC (root of tree)
 and PCE. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B050">[[Sasha]] I wil=
l look up this draft as well.
</span></i></b><span style=3D"color:#00B050"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">Pleade note that if the anser to #3 in my original=20message is posi=
tive, then the statement in the draft that say the Replication Segment is =
similar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">[RP] Since Replication SID is local to a Node, the Replication SID o=
f the Replication segment at Root (or Headend) node can be used as a (cons=
tant) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"col=
or:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in=
 8204 and the Replication SID as defined here is that the former is instan=
tiated just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream no=
des.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
Here we use &#8220;Binding SID&#8221; to denote that fact that Replication=
 SID (or Tree-SID=20for P2MP trees) at the Root MAY be used as a constant =
SID that allows packets to be steered into a Replication
 segment or a P2MP tree. Note the drafts do not exclude the possibility th=
at Replication SIDs at downstream nodes or non-Root Replication segments c=
an change</span><span style=3D"font-size:10.0pt;color:#00B050">.<b><i>[[Sa=
sha]] Please see above.
</i></b>&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#00B050"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Ris=
habh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Wednesday, October 16, 2019 10:26 PM<br>
<b>To:</b> Rishabh Parekh (riparekh) &lt;<a href=3D"mailto:riparekh@cisco.=
com">riparekh@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Clarenc=
e Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@c=
isco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a>; <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voy=
er@bell.ca</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Re-sending with corre=
cted To and CC lists...<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </=
span><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainsht=
ein@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein <br>
<b>Sent:</b> Thursday, October 17, 2019 8:25 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a=
><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Rishabh=
 Parekh (riparekh) &lt;<a href=3D"mailto:riparekh@cisco.com">riparekh@cisc=
o.com</a>&gt;; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil=
@cisco.com">cfilsfil@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a =
prompt and detailed response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please see more </spa=
n><b><i><span style=3D"color:#00B0F0">inline below</span></i></b><span sty=
le=3D"color:#1F497D">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </=
span><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainsht=
ein@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;<a href=3D=
"mailto:riparekh@cisco.com">riparekh@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 1:24 AM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a>; Clarence=
 Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@ci=
sco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Resp=
onses to your queries are prefaced with [RP].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l4 level1 lfo6"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times=20New Roman&quot;"> </sp=
an></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that =
&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quo=
t;Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, D=
ownstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that t=
he </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Co=
urier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of </span><a href=3D=
"https://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F=
%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">RFC8402</span></a><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">?<o:p></o:p></sp=
an></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID not a topological SID as defined the sections you point to in =
RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that represents=
 the Replication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </=
span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the =
process of writing. Actually I wanted to ask whether the SIDs in the list =
that represent a specific Replication Branch are the SIDs defined in RFC 8=
204. The text I see in the </span></i></b><a href=3D"https://clicktime.sym=
antec.com/3KYcTh6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fht=
ml%2Fdraft-voyer-pim-sr-p2mp-policy-00"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span></i><=
/b></a><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quo=
t;,sans-serif;color:#1F497D"> </span></i></b><b><i><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B0F0">draft s=
eems to suggest that it is not necessarily so &nbsp;because a Tree-SID is =
considered also as the Replication SID. This looks inconsistent to me beca=
use a Replication SID as defined in this draft is instantiated both in the=
 Replication node and in the Downstream nodes while the Tree-SID does not =
require instantiation in the Leaf nodes (this is optional). </span></i></b=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f;color:#1F497D"><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre=20style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:a=
lways;mso-list:l4 level1 lfo6"><![if !supportLists]><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-l=
ist:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </sp=
an></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says =
that</span> &#8220;<span lang=3D"EN" style=3D"font-size:12.0pt;font-family=
:&quot;Courier New&quot;">A Replication branch to a particular Downstream =
Node could be represented by the node's Node </span><span lang=3D"EN" styl=
e=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">SID</=
span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif">&#8221;. &nbsp;Does this mean that the Replication Node sends the p=
ackets it receives with the Replication SID as the active segment with the=
 labels representing the downstream Node SID as the active segment across =
such a replication branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID relevant at a downstream node would be the bottom label with o=
ther SIDs stacked on top which would guide the packet to the downstream no=
de. Of course, if the Downstream node is adjacent to the Replication node,=
 only the Replication SID would be present in the outgoing packet<span sty=
le=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, thanks</i></b></span><b><i><span=
 style=3D"color:#1F497D">. </span></i></b><span style=3D"color:#1F497D">&n=
bsp;</span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l4 level1 lfo6"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">Replication segment is instantiated at Downstream =
nodes and at the Replication node</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean th=
at the list of SIDs associated with the specific replication Branch is pus=
hed by the Replication Node on top of the label representing the Replicati=
on SID in the Downstream node of this branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Yes. See=
 response to 2 above<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, tha=
nks again.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l4 level1 lfo6"><![if !supportLists]><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-=
list:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </s=
pan></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Are the labels that=
 represent the Replication SID at the Downstream nodes downstream-allocate=
d by these nodes or upstream-allocated by the replication node?</span><spa=
n lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot=
;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Since th=
e Replication SID is locally relevant at a node, the Replication SID would=
 be downstream-allocated. However, it may also be allocated by PCE; see re=
sponse to 5, 6 below<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, tha=
nks.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span lang=3D"E=
N" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;"><o:p>&nb=
sp;</o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l4 level1 lfo6"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &nbsp;&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-fa=
mily:&quot;Courier New&quot;">A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE</span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">&#8221;. These two op=
tions look exactly the same to me from the POV of the node on which the Re=
plication segment is programmed - what, if anything, did I miss?<o:p></o:p=
></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are =
right in that it does not matter how Replication segment is instantiated a=
t a node. The use of PCE is relevant for </span><a href=3D"https://clickti=
me.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ie=
tf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F"><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span><=
/a><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-se=
rif"> draft where PCE instantiates Replication segments<span style=3D"colo=
r:#00B0F0">.<b><i>[[Sasha]] OK, I will &nbsp;look up the second draft. BTW=
, it does not appear as a reference in this one &#8211; is it intentional?=
</i></b> <o:p></o:p></span></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l4 level1 lfo6"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do =
not strictly preclude any protocol , but one of the goals of SR is to simp=
lify. The idea is same here - use replication segments to realize P2MP tre=
es computed by PCE (without need of multicast protocols) as specified in S=
R P2MP draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-=
known aspects that make multicast different is that the traffic in the Ser=
vice Provider domain is driven by the dynamic customer requests. Handling =
these requests via a PCE looks problematic to me. </span></i></b><span sty=
le=3D"color:#00B0F0"><o:p></o:p></span></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiat=
ion of the Replication Segment in SR-MPLS would be highly appreciated.<o:p=
></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">[RP]SR P2MP policy draft lists d=
ifferent protocols (PCEP, BGP, etc.) that can be used to instantiate Repli=
cation segments. </span><a href=3D"https://clicktime.symantec.com/3JuFtE8q=
kd9Viz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-dhs-spr=
ing-pce-sr-p2mp-policy-00"><span style=3D"font-size:11.0pt;font-family:&qu=
ot;Calibri&quot;,sans-serif">SR P2MP PCEP</span></a><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> would be updated; o=
ther drafts will be published in future.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">More of the same...<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">Pleade note that if the anser to #3 in my original message is positi=
ve, then the statement in the draft that say the Replication Segment is si=
milar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">[RP] Since Replication SID is local to a Node, the Replication SID o=
f the Replication segment at Root (or Headend) node can be used as a (cons=
tant) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"col=
or:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in=
 8204 and the Replication SID as defined here is that the former is instan=
tiated just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream no=
des.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Ris=
habh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 6:31 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a=
>; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">=
cfilsfil@cisco.com</a>&gt;; Rishabh Parekh (riparekh) &lt;<a href=3D"mailt=
o:riparekh@cisco.com">riparekh@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear colleagues,<o:p></o:p></p>
<p class=3D"MsoNormal">I have read the <a href=3D"https://clicktime.symant=
ec.com/3G11JyktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%=
2Fdraft-voyer-spring-sr-replication-segment-00">
Replication SID draft</a>, and I have a few questions dealing with possibl=
e instantiation of the Replication SOD in
<a href=3D"https://clicktime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dh=
ttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpl=
s-22">
SR-MPLS</a>.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that &#=
8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;=
Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, Dow=
nstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that the=
 </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Cour=
ier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of </span><a href=3D=
"https://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F=
%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">RFC8402</span></a><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">? <o:p></o:p></s=
pan></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at</span> &#8220;<span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">A Replication branch to a particular Downstream No=
de could be represented by the node's Node </span><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">SID</span=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f">&#8221;. &nbsp;Does this mean that the Replication Node sends the packe=
ts it receives with the Replication SID as the active segment with the lab=
els representing the downstream Node SID as the active segment across such=
 a replication branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">Replication segment is instantiated at Downstream =
nodes and at the Replication node</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean th=
at the list of SIDs associated with the specific replication Branch is pus=
hed by the Replication Node on top of the label representing the Replicati=
on SID in the Downstream node of this branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-=
list:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </s=
pan></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Are the labels that=
 represent the Replication SID at the Downstream nodes downstream-allocate=
d by these nodes or upstream-allocated by the replication node? </span><sp=
an lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quo=
t;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &nbsp;&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-fa=
mily:&quot;Courier New&quot;">A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE</span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">&#8221;. These two op=
tions look exactly the same to me from the POV of the node on which the Re=
plication segment is programmed - what, if anything, did I miss?<o:p></o:p=
></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiat=
ion of the Replication Segment in SR-MPLS would be highly appreciated.<o:p=
></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><br>
__________________________________________________________________________=
_<br>
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This e-mail message is intended for the recipient only and contains inform=
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Rishabh Parekh (riparekh)" <riparekh@cisco.com>
CC: "spring@ietf.org" <spring@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "zzhang@juniper.net" <zzhang@juniper.net>, "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>
Thread-Topic: Some questions regarding Replication SID
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Subject: Re: [spring] Some questions regarding Replication SID
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Rishabh,
FYI, the MVPN Aggregation Label draft has been updated just now.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: Alexander Vainshtein
Sent: Thursday, October 24, 2019 11:06 AM
To: Rishabh Parekh (riparekh) <riparekh@cisco.com>
Cc: spring@ietf.org; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com>; ho=
oman.bidgoli@nokia.com; zzhang@juniper.net; daniel.voyer@bell.ca
Subject: RE: Some questions regarding Replication SID

Rishabh,
Again lots of thanks for a prompt and very informative response.

My problem with this response that, from my POV, you implicitly define two=
 different flavors of the Replication SID:

-          One of these flavors MUST be instantiated both in the Replicati=
on Node and in the Downstream nodes, so that it CONTINUEs in each specific=
 Replication Branch

-          The other flavor MUST NOT be instantiated in the Replication No=
de bot MUST NOT be instantiated in the Downstream nodes so that the Replic=
ation Node treats it as NEXT in each Replication branch.

I understand why each of these flavors may be useful,. However, with the d=
ifference being implicit, this is apt to raise some issues, e.g.: can the =
same Replication SID be treated by the Replication Bode as CONTINUE in som=
e of its Replication Branches and as NEXT - in some other ones? Unless I h=
ave missed something, nothing in the current text of the draft prevents su=
ch a mix. Is this indeed your intention?

BTW, the MVPN Aggregation Label draft<https://tools.ietf.org/html/draft-ie=
tf-bess-mvpn-evpn-aggregation-label-02> that you have mentioned has expire=
d. Do you happen know if the authors intend to revive it?

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>

From: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.=
com>>
Sent: Tuesday, October 22, 2019 8:25 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexande=
r.Vainshtein@ecitele.com>>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Clarence Filsfils (cfilsfil) =
<cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<=
mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper=
.net>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Subject: RE: Some questions regarding Replication SID

Sasha,

This looks inconsistent to me because a Replication SID as defined in this=
 draft is instantiated both in the Replication node and in the Downstream =
nodes while the Tree-SID does not require instantiation in the Leaf nodes =
(this is optional).
[RP]Replication segment draft describes how a *single* Replication segment=
 can be used for a Multi-point service. In that case, the Replication SID =
at downstream nodes (which are the Leaf nodes of the service) is used to d=
erive service context. The P2MP policy draft  makes Replication segments a=
t Leaf nodes OPTIONAL when it is possible to derive service context from s=
ome other information in the packet. Thinking more about this,=20even for =
the single Replication segment, it might be possible to avoid instantiatio=
n at Downstream nodes when service context can be derived from some other =
information in the packet. We might consider this for next revision.
[[Sasha]] I am confused now. From my POV either the Replication SID MUST b=
e represented both in the Replication node and in all Downstream nodes, or=
 it MUST be local for the Replication Node only. In the first case its han=
dling effectively is CONTINUE in each Replication Branch, in the second ca=
se it is NEXT in each Replication Branch. I do not see how you can have tw=
o different kinds of handling for the same type of SID.

I definitely did not intend to confuse you! Sometimes such discussion can =
get quite esoteric and written word (as compared to say whiteboard diagram=
) is not the best medium, but let me try to clarify. If you wish, we can s=
chedule a conference call to discuss further.

Typically, for any multicast transport, it is not possible to carry a down=
stream assigned service context (VPN label) in the label stack (since it i=
s difficult to orchestrate all the Leaf nodes to assign same value for the=
 context). So, the transport label (Replication SID) is used to derive the=
 service context. This requires Replication SID to be instantiated on the =
Leaf nodes and as you say, the Replication node performs CONTINUE operatio=
n. However, if the service context can be assigned globally (for e.g. DCB =
from https://tools.ietf.org/html/draft-ietf-bess-mvpn-evpn-aggregation-lab=
el-02<https://clicktime.symantec.com/32QsG9Cr65bx26TTfRS6U876H2?u=3Dhttps%=
3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-bess-mvpn-evpn-aggregation-labe=
l-02>), then Replication SID is not strictly required at Leaf nodes and th=
erefore Replication node can perform NEXT operation. Some of these details=
 are covered in Section 2.1 of the P2MP policy draft.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Tuesday, October 22, 2019 7:30 AM
To: Rishabh Parekh (riparekh)=20<riparekh@cisco.com<mailto:riparekh@cisco.=
com>>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Clarence Filsfils (cfilsfil) =
<cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<=
mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper=
.net>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Subject: RE: Some questions regarding Replication SID


Rishabh,
Lots of thanks for a prompt response and apologies for the delays.

Please see more inline below.
Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>

From: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.=
com>>
Sent: Thursday, October 17, 2019 9:38 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexande=
r.Vainshtein@ecitele.com>>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Clarence Filsfils (cfilsfil) =
<cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<=
mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper=
.net>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Subject: RE: Some questions regarding Replication SID

Sasha,


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you=
 point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) th=
at represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actua=
lly I wanted to ask whether the SIDs in the list that represent a specific=
 Replication Branch are the SIDs defined in RFC 8204. The text I see in th=
e SR P2MP Policy<https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6H2=
?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-policy-=
00> draft seems to suggest that it is not necessarily so  because a Tree-S=
ID is considered also as the Replication SID. This looks inconsistent to m=
e because a Replication SID as defined in this draft is instantiated both =
in the Replication node and in the Downstream nodes while the Tree-SID doe=
s not require instantiation in the Leaf nodes (this is optional).

[RP]I am not sure I completely understand your questions above. Let's brea=
k them down and see if my responses clarify them:
Actually I wanted to ask whether the SIDs in the list that represent a spe=
cific Replication Branch are the SIDs defined in RFC 8204
[RP] I think my responses to questions 2 and 3 in your original e-mail sho=
uld make this clear. Let me know if it is not.

The text I see in the SR P2MP Policy<https://clicktime.symantec.com/3KYcTh=
6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer=
-pim-sr-p2mp-policy-00> draft seems to suggest that it is not necessarily =
so  because a Tree-SID is considered also as the Replication SID.
[RP]SR P2MP Policy draft specifies a way to create P2MP trees by stitching=
 Replication Segments together. The Replication SID of the Replication seg=
ment at root of a tree is called Tree-SID since this SID allows packets to=
 be replicated across the tree.

This looks inconsistent to me because a Replication SID as defined in this=
 draft is instantiated both in the Replication node and in the Downstream =
nodes while the Tree-SID does not require instantiation in the Leaf nodes =
(this is optional).
[RP]Replication segment draft describes how a *single* Replication segment=
 can be used for a Multi-point service. In that case, the Replication SID =
at downstream nodes (which are the Leaf nodes of the service) is used to d=
erive service context. The P2MP policy draft  makes Replication segments a=
t Leaf nodes OPTIONAL when it is possible to derive service context from s=
ome other information in the packet. Thinking more about this, even for th=
e single Replication segment, it might be possible to avoid instantiation =
at Downstream nodes when service context can be derived from some other in=
formation in the packet. We might consider this for next revision.
[[Sasha]] I am confused now. From my POV either the Replication SID MUST b=
e represented both in the Replication node and in all Downstream nodes, or=
 it MUST be local for the Replication Node only. In the first case its han=
dling effectively is CONTINUE in each Replication Branch, in the second ca=
se it is NEXT in each Replication Branch. I do not see how you can have tw=
o different kinds of handling for the same type of SID.



[RP] You are right in that it does not matter how Replication segment is i=
nstantiated at a node. The use of PCE is relevant for SR P2MP Policy<https=
://clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PC=
E instantiates Replication segments.[[Sasha]] OK, I will  look up the seco=
nd draft. BTW, it does not appear as a reference in this one - is it inten=
tional?
[RP]The P2MP policy draft uses Replication segment draft as a base, but it=
 is not the other way around. We can add a Informative reference in next r=
evision if you think it will help.[[Sasha]] It would help IMHO.


1. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of =
SR is to simplify. The idea is same here - use replication segments to rea=
lize P2MP trees computed by PCE (without need of multicast protocols) as s=
pecified in SR P2MP draft[[Sasha]] One of the well-known aspects that make=
 multicast different is that the traffic in the Service Provider domain is=
 driven by the dynamic customer requests. Handling these requests via a PC=
E looks problematic to me.
[RP]SR P2MP MVPN<https://clicktime.symantec.com/329erDXYCoUNudUpd4NoApR6H2=
?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-parekh-bess-mvpn-sr-=
p2mp%2F> draft,  which will be updated soon, specifies procedures for dyna=
mic updates SR P2MP trees using BGP MVPN; this includes dampening procedur=
es to control interaction between PCC (root of tree) and PCE.
[[Sasha]] I will look up this draft as well.

Pleade note that if the anser to #3 in my original message is positive, th=
en the statement in the draft that say the Replication Segment is similar =
to the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the =
Replication segment at Root (or Headend) node can be used as a (constant) =
Binding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and th=
e Replication SID as defined here is that the former is instantiated just =
locally while the Replication SID is instantiated both in the Replication =
node and in the Downstream nodes.
[RP]Here we=20use "Binding SID" to denote that fact that Replication SID (=
or Tree-SID for P2MP trees) at the Root MAY be used as a constant SID that=
 allows packets to be steered into a Replication segment or a P2MP tree. N=
ote the drafts do not exclude the possibility that Replication SIDs at dow=
nstream nodes or non-Root Replication segments can change.[[Sasha]] Please=
 see above.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Wednesday, October 16, 2019 10:26 PM
To: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.co=
m>>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Clarence Filsfils (cfilsfil) =
<cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com<=
mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@juniper=
.net>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Subject: RE: Some questions regarding Replication SID

Re-sending with corrected To and CC lists...

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>

From: Alexander Vainshtein
Sent: Thursday, October 17, 2019 8:25 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>
Cc: spring@ietf.org<mailto:spring@ietf.org>; Rishabh Parekh (riparekh) <ri=
parekh@cisco.com<mailto:riparekh@cisco.com>>; Clarence Filsfils (cfilsfil)=
 <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; hooman.bidgoli@nokia.com=
<mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzhang@junipe=
r.net>
Subject: RE: Some questions regarding Replication SID

Rishabh,
Lots of thanks for a prompt and detailed response.

Please see more inline below.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>

From: Rishabh Parekh (riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.=
com>>
Sent: Thursday, October 17, 2019 1:24 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexande=
r.Vainshtein@ecitele.com>>; daniel.voyer@bell.ca<mailto:daniel.voyer@bell.=
ca>; Clarence Filsfils (cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisc=
o.com>>; hooman.bidgoli@nokia.com<mailto:hooman.bidgoli@nokia.com>; zzhang=
@juniper.net<mailto:zzhang@juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: RE: Some questions regarding Replication SID

Alexander,
Responses to your queries are prefaced with [RP].


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

[RP] No, Replication SID not a topological SID as defined the sections you=
 point to in RFC 8402. Instead, it is a separate SID (label in SR-MPLS) th=
at represents the Replication segment in data plane.

[[Sasha]] Oops! This question got mangled in the process of writing. Actua=
lly I wanted to ask whether the SIDs in the list that represent a specific=
 Replication Branch are the SIDs defined in RFC 8204. The text I see in th=
e SR P2MP Policy<https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6H2=
?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-policy-=
00> draft seems to suggest that it is not necessarily so  because a Tree-S=
ID is considered also as the Replication SID. This looks inconsistent to m=
e because a Replication SID as defined in this draft is instantiated both =
in the Replication node and in the Downstream nodes while the Tree-SID doe=
s not require instantiation in the Leaf nodes (this is optional).



2. The draft also says that "A Replication branch to a particular Downstre=
am Node could be represented by the node's Node SID".  Does this mean that=
 the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node =
SID as the active segment across such a replication branch?

[RP] No, Replication SID relevant at a downstream node would be the bottom=
 label with other SIDs stacked on top which would guide the packet to the =
downstream node. Of course, if the Downstream node is adjacent to the Repl=
ication node, only the Replication SID would be present in the outgoing pa=
cket.[[Sasha]] OK, thanks.



3. The draft also says that "Replication segment is instantiated at Downst=
ream nodes and at the Replication node".  Does that mean that the list of =
SIDs associated with the specific replication Branch is pushed by the Repl=
ication Node on top of the label representing the Replication SID in the D=
ownstream node of this branch?

[RP] Yes. See response to 2 above.[[Sasha]] OK, thanks again.



4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

[RP] Since the Replication SID is locally relevant at a node, the Replicat=
ion SID would be downstream-allocated. However, it may also be allocated=20=
by PCE; see response to 5, 6 below.[[Sasha]] OK, thanks.



5. The draft also says that  "A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE". These two options look exac=
tly the same to me from the POV of the node on which the Replication segme=
nt is programmed - what, if anything, did I miss?

[RP] You are right in that it does not matter how Replication segment is i=
nstantiated at a node. The use of PCE is relevant for SR P2MP Policy<https=
://clicktime.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F> draft where PC=
E instantiates Replication segments.[[Sasha]] OK, I will  look up the seco=
nd draft. BTW, it does not appear as a reference in this one - is it inten=
tional?



6. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?

[RP] . We do not strictly preclude any protocol , but one of the goals of =
SR is to simplify. The idea is same here - use replication segments to rea=
lize P2MP trees computed by PCE (without need of multicast protocols) as s=
pecified in SR P2MP draft[[Sasha]] One of the well-known aspects that make=
 multicast different is that the traffic in the Service Provider domain is=
 driven by the dynamic customer requests. Handling these requests via a PC=
E looks problematic to me.



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be highly appreciated.

[RP]SR P2MP policy draft lists different protocols (PCEP, BGP, etc.) that =
can be used to instantiate Replication segments. SR P2MP PCEP<https://clic=
ktime.symantec.com/3JuFtE8qkd9Viz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf=
.org%2Fhtml%2Fdraft-dhs-spring-pce-sr-p2mp-policy-00> would be updated; ot=
her drafts will be published in future.


More of the same...
Pleade note that if the anser to #3 in my original message is positive, th=
en the statement in the draft that say the Replication Segment is similar =
to the Binding segment srems to be inaccurate.
[RP] Since Replication SID is local to a Node, the Replication SID of the =
Replication segment at Root (or Headend) node can be used as a (constant) =
Binding SID to steer traffic into the segment.
[[Sasha]] The difference between the Binding SID as defined in 8204 and th=
e Replication SID as defined here is that the former is instantiated just =
locally while the Replication SID is instantiated both in the Replication =
node and in the Downstream nodes.

-Rishabh

From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Tuesday, October 15, 2019 6:31 AM
To: daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>; Clarence Filsfils (=
cfilsfil) <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>; Rishabh Parekh =
(riparekh) <riparekh@cisco.com<mailto:riparekh@cisco.com>>; hooman.bidgoli=
@nokia.com<mailto:hooman.bidgoli@nokia.com>; zzhang@juniper.net<mailto:zzh=
ang@juniper.net>
Cc: spring@ietf.org<mailto:spring@ietf.org>
Subject: Some questions regarding Replication SID

Dear colleagues,
I have read the Replication SID draft<https://clicktime.symantec.com/3G11J=
yktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voye=
r-spring-sr-replication-segment-00>, and I have a few questions dealing wi=
th possible instantiation of the Replication SOD in SR-MPLS<https://clickt=
ime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dhttps%3A%2F%2Ftools.ietf.o=
rg%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpls-22>.


1. The draft says that "each branch is abstracted to a <Downstream Node, D=
ownstream Replication-SID>".  Does that mean that the Downstream Replicati=
on-SID is one of the SIDs defined in Sections 3, 4 and 5  of RFC8402<https=
://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F%2Ftoo=
ls.ietf.org%2Fhtml%2Frfc8402>?

2. The draft also says that "A Replication branch to a particular Downstre=
am Node could be represented by the node's Node SID".  Does this mean that=
 the Replication Node sends the packets it receives with the Replication S=
ID as the active segment with the labels representing the downstream Node =
SID as the active segment across such a replication branch?

3. The draft also says that "Replication segment is instantiated at Downst=
ream nodes and at the Replication node".  Does that mean that the list of =
SIDs associated with the specific replication Branch is pushed by the Repl=
ication Node on top of the label representing the Replication SID in the D=
ownstream node of this branch?

4. Are the labels that represent the Replication SID at the Downstream nod=
es downstream-allocated by these nodes or upstream-allocated by the replic=
ation node?

5. The draft also says that  "A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE". These two options look exac=
tly the same to me from the POV of the node on which the Replication segme=
nt is programmed - what, if anything, did I miss?

6. Did you consider a possibility of advertising the Replication Segment f=
rom the Downstream nodes to the Replication one using some multicast routi=
ng protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a =
possibility strictly precluded?



Any details regarding instantiation of the Replication Segment in SR-MPLS =
would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>


__________________________________________________________________________=
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delete the original
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__________________________________________________________________________=
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
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delete the original
and all copies thereof.
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__________________________________________________________________________=
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This e-mail message is intended for the recipient only and contains inform=
ation which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this
transmission in error, please inform us by e-mail, phone or fax, and then =
delete the original
and all copies thereof.
__________________________________________________________________________=
_

__________________________________________________________________________=
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This e-mail message is intended for the recipient only and contains inform=
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CONFIDENTIAL and which may be proprietary to ECI=20Telecom. If you have re=
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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">FYI, the MVPN Aggrega=
tion Label draft has been updated just now.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; Al=
exander.Vainshtein@ecitele.com<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein <br>
<b>Sent:</b> Thursday, October 24, 2019 11:06 AM<br>
<b>To:</b> Rishabh Parekh (riparekh) &lt;riparekh@cisco.com&gt;<br>
<b>Cc:</b> spring@ietf.org; Clarence Filsfils (cfilsfil) &lt;cfilsfil@cisc=
o.com&gt;; hooman.bidgoli@nokia.com; zzhang@juniper.net; daniel.voyer@bell=
.ca<br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Again lots of thanks =
for a prompt and very informative response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">My problem with this =
response that, from my POV, you
<b><i>implicitly</i></b> define two different flavors of the Replication S=
ID:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 lev=
el1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D=
"mso-list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">One of these flavors MUST be instantiated both in the Replicat=
ion Node and in the Downstream nodes, so that it CONTINUEs in each specifi=
c Replication Branch<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 lev=
el1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D=
"mso-list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">The other flavor MUST NOT be instantiated in the Replication N=
ode bot MUST NOT be instantiated in the Downstream nodes so that the=20Rep=
lication Node treats it as NEXT in each Replication
 branch.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I understand why each=
 of these flavors may be useful,. However, with the difference being impli=
cit, this is apt to raise some issues, e.g.: can the same Replication SID =
be treated by the Replication Bode as CONTINUE
 in some of its Replication Branches and as NEXT &#8211; in some other one=
s? Unless I have missed something, nothing in the current text of the draf=
t prevents such a mix. Is this indeed your intention?<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">BTW, the <a href=3D"h=
ttps://tools.ietf.org/html/draft-ietf-bess-mvpn-evpn-aggregation-label-02"=
>
MVPN Aggregation Label draft</a> that you have mentioned has expired. Do y=
ou happen know if the authors intend to revive it?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; <a=
 href=3D"mailto:Alexander.Vainshtein@ecitele.com">
Alexander.Vainshtein@ecitele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;<a href=3D=
"mailto:riparekh@cisco.com">riparekh@cisco.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, October 22, 2019 8:25 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Clarenc=
e Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@c=
isco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a>; <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voy=
er@bell.ca</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Sash=
a,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">This looks inco=
nsistent to me because a Replication SID as defined in this draft is insta=
ntiated both in the Replication node and in the Downstream nodes while the=
 Tree-SID does not require instantiation
 in the Leaf nodes (this is optional).</span></i></b><span style=3D"font-s=
ize:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
Replication segment draft describes how a *<b>single</b>* Replication segm=
ent can be used for a Multi-point service. In that case, the Replication S=
ID at downstream nodes (which are the Leaf
 nodes of the service) is used to derive service context. The P2MP policy =
draft&nbsp; makes Replication segments at Leaf nodes OPTIONAL when it is p=
ossible to derive service context from some other information in the packe=
t. Thinking more about this, even for the
 single Replication segment, it might be possible to avoid instantiation a=
t Downstream nodes when service context can be derived from some other inf=
ormation in the packet. We might consider this for next revision.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B050">[[Sasha]] I am =
confused now. From my POV either the Replication SID MUST be represented b=
oth in the Replication node and in all Downstream nodes, or it MUST be loc=
al for the Replication Node only. In the
 first case its handling effectively is CONTINUE in each Replication Branc=
h, in the second case it is NEXT in each Replication Branch. I do not see =
how you can have two different kinds of handling for the same type of SID.=

</span></i></b><span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">I de=
finitely did not intend to confuse you! Sometimes such discussion can get =
quite esoteric and written word (as compared to say whiteboard diagram) is=
 not the best medium, but let me try to
 clarify. If you wish, we can schedule a conference call to discuss furthe=
r.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Typi=
cally, for any multicast transport, it is not possible to carry a downstre=
am assigned service context (VPN label) in the label stack (since it is di=
fficult to orchestrate all the Leaf nodes
 to assign same value for the context). So, the transport label (Replicati=
on SID) is used to derive the service context. This requires Replication S=
ID to be instantiated on the Leaf nodes and as you say, the Replication no=
de performs CONTINUE operation. However,
 if the service context can be assigned globally (for e.g. DCB from <a hre=
f=3D"https://clicktime.symantec.com/32QsG9Cr65bx26TTfRS6U876H2?u=3Dhttps%3=
A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-bess-mvpn-evpn-aggregation-label=
-02">
https://tools.ietf.org/html/draft-ietf-bess-mvpn-evpn-aggregation-label-02=
</a>), then Replication SID is not strictly required at Leaf nodes and the=
refore Replication node can perform NEXT operation. Some of these details =
are covered in Section 2.1 of the P2MP
 policy draft.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Ris=
habh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Tuesday, October 22, 2019 7:30 AM<br>
<b>To:</b> Rishabh Parekh (riparekh) &lt;<a href=3D"mailto:riparekh@cisco.=
com">riparekh@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Clarenc=
e Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@c=
isco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a>; <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voy=
er@bell.ca</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a =
prompt response and apologies for the delays.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please see more </spa=
n><b><i><span style=3D"color:#00B050">inline below</span></i></b><span sty=
le=3D"color:#1F497D">.<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p=20class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-39=
266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </=
span><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainsht=
ein@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;<a href=3D=
"mailto:riparekh@cisco.com">riparekh@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 9:38 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Clarenc=
e Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@c=
isco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a>; <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voy=
er@bell.ca</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Sash=
a,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l2 level1 lfo4"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that &#=
8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;=
Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, Dow=
nstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that the=
 </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Cour=
ier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of </span><a href=3D=
"https://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F=
%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">RFC8402</span></a><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">?<o:p></o:p></sp=
an></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID not a topological SID as defined the sections you point to in =
RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that represents=
 the Replication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </=
span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the =
process of writing. Actually I wanted to ask whether the SIDs in the list =
that represent a specific Replication Branch are the SIDs defined in RFC 8=
204. The text I see in the </span></i></b><a href=3D"https://clicktime.sym=
antec.com/3KYcTh6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fht=
ml%2Fdraft-voyer-pim-sr-p2mp-policy-00"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span></i><=
/b></a><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quo=
t;,sans-serif;color:#1F497D"> </span></i></b><b><i><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B0F0">draft s=
eems to suggest that it is not necessarily so &nbsp;because a Tree-SID is =
considered also as the Replication SID. This looks inconsistent to me beca=
use a Replication SID as defined in this draft is instantiated both in the=
 Replication node and in the Downstream nodes while the Tree-SID does not =
require instantiation in the Leaf nodes (this is optional). </span></i></b=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f;color:#1F497D"><o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
I am not sure I completely understand your questions above. Let&#8217;s br=
eak them down and see if my responses clarify them:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">Actually I want=
ed to ask whether the SIDs in the list that represent a specific Replicati=
on Branch are the SIDs defined in RFC 8204</span></i></b><span style=3D"fo=
nt-size:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
 I think my responses to questions 2 and 3 in your original e-mail should =
make this clear. Let me know if it is not.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">The text I see =
in the </span>
</i></b><a href=3D"https://clicktime.symantec.com/3KYcTh6w8kroEVd6FFNtXYc6=
H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-voyer-pim-sr-p2mp-polic=
y-00"><b><i>SR P2MP Policy</i></b></a><b><i><span style=3D"color:#1F497D">=

</span><span style=3D"color:#00B0F0">draft seems to suggest that it is not=
 necessarily so &nbsp;because a Tree-SID is considered also as the Replica=
tion SID.</span></i></b><span style=3D"font-size:10.0pt;color:#1F497D"><o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
SR P2MP Policy draft specifies a way to create P2MP trees by stitching Rep=
lication Segments together. The Replication SID of the Replication segment=
 at root of a tree is called Tree-SID since
 this SID allows packets to be replicated across the tree.<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B0F0">This looks inco=
nsistent to me because a Replication SID as defined in this draft is insta=
ntiated both in the Replication node and in the Downstream nodes while the=
 Tree-SID does not require instantiation
 in the Leaf nodes (this is optional).</span></i></b><span style=3D"font-s=
ize:10.0pt;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
Replication segment draft describes how a *<b>single</b>* Replication segm=
ent can be used for a Multi-point service. In that case, the Replication S=
ID at downstream nodes (which are the Leaf
 nodes of the service) is used to derive service context. The P2MP policy =
draft&nbsp; makes Replication segments at Leaf nodes OPTIONAL when it is p=
ossible to derive service context from some other information in the packe=
t. Thinking more about this, even for the
 single Replication segment, it might be possible to avoid instantiation a=
t Downstream nodes when service context can be derived from some other inf=
ormation in the packet. We might consider this for next revision.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B050">[[Sasha]] I am =
confused now. From my POV either the Replication SID MUST be represented b=
oth in the Replication node and in all Downstream nodes, or it MUST be loc=
al for the Replication Node only. In the
 first case its handling effectively is CONTINUE in each Replication Branc=
h, in the second case it is NEXT in each Replication Branch. I do not see=20=
how you can have two different kinds of handling for the same type of SID.=

</span></i></b><span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are =
right in that it does not matter how Replication segment is instantiated a=
t a node. The use of PCE is relevant for </span><a href=3D"https://clickti=
me.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ie=
tf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F"><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span><=
/a><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-se=
rif"> draft where PCE instantiates Replication segments<span style=3D"colo=
r:#00B0F0">.<b><i>[[Sasha]] OK, I will &nbsp;look up the second draft. BTW=
, it does not appear as a reference in this one &#8211; is it intentional?=
</i></b> <o:p></o:p></span></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
The P2MP policy draft uses Replication segment draft as a base, but it is =
not the other way around. We can add a Informative reference in next revis=
ion if you think it will help</span><span style=3D"font-size:10.0pt;color:=
#00B050">.<b><i>[[Sasha]]
 It would help IMHO.</i></b></span><span style=3D"font-size:10.0pt;color:#=
1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l3 level1 lfo6"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do =
not strictly preclude any protocol , but one of the goals of SR is to simp=
lify. The idea is same here - use replication segments to realize P2MP tre=
es computed by PCE (without need of multicast protocols) as specified in S=
R P2MP draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-=
known aspects that make multicast different is that the traffic in the Ser=
vice Provider domain is driven by the dynamic customer requests. Handling =
these requests via a PCE looks problematic to me. </span></i></b><span sty=
le=3D"color:#00B0F0"><o:p></o:p></span></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
</span><a href=3D"https://clicktime.symantec.com/329erDXYCoUNudUpd4NoApR6H=
2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-parekh-bess-mvpn-sr=
-p2mp%2F"><span style=3D"font-size:10.0pt">SR
 P2MP MVPN</span></a><span style=3D"font-size:10.0pt;color:#1F497D"> draft=
,&nbsp; which will be updated soon, specifies procedures for dynamic updat=
es SR P2MP trees using BGP MVPN; this includes dampening procedures to con=
trol interaction between PCC (root of tree)
 and PCE. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#00B050">[[Sasha]] I wil=
l look up this draft as well.
</span></i></b><span style=3D"color:#00B050"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">Pleade note that if the anser to #3 in my original message is positi=
ve, then the statement in the draft that say the Replication Segment is si=
milar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">[RP] Since Replication SID is local to a Node, the Replication SID o=
f the Replication segment at Root (or Headend) node can be used as a (cons=
tant) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"col=
or:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in=
 8204 and the Replication SID as defined here is that the former is instan=
tiated just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream no=
des.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">[RP]=
Here we use &#8220;Binding SID&#8221; to denote that fact that Replication=
 SID (or Tree-SID for P2MP trees) at the Root MAY be used as a constant SI=
D that allows packets to be steered into a Replication
 segment or a P2MP tree. Note the drafts do not exclude the possibility th=
at Replication SIDs at downstream nodes or non-Root Replication segments c=
an change</span><span style=3D"font-size:10.0pt;color:#00B050">.<b><i>[[Sa=
sha]] Please see above.
</i></b>&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#00B050"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Ris=
habh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Wednesday, October 16, 2019 10:26 PM<br>
<b>To:</b> Rishabh Parekh (riparekh) &lt;<a href=3D"mailto:riparekh@cisco.=
com">riparekh@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Clarenc=
e Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@c=
isco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a>; <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voy=
er@bell.ca</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Re-sending with corre=
cted To and CC lists...<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p=20class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </=
span><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainsht=
ein@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein <br>
<b>Sent:</b> Thursday, October 17, 2019 8:25 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a=
><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; Rishabh=
 Parekh (riparekh) &lt;<a href=3D"mailto:riparekh@cisco.com">riparekh@cisc=
o.com</a>&gt;; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil=
@cisco.com">cfilsfil@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rishabh,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a =
prompt and detailed response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please see more </spa=
n><b><i><span style=3D"color:#00B0F0">inline below</span></i></b><span sty=
le=3D"color:#1F497D">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; </=
span><a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainsht=
ein@ecitele.com</a><span style=3D"color:#1F497D"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rishabh Parekh (riparekh) &lt;<a href=3D=
"mailto:riparekh@cisco.com">riparekh@cisco.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 17, 2019 1:24 AM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a>; Clarence=
 Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">cfilsfil@ci=
sco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> RE: Some questions regarding Replication SID<o:p></o:p></p=
>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Resp=
onses to your queries are prefaced with [RP].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l4 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that &#=
8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;=
Courier New&quot;">each branch is abstracted to a &lt;Downstream Node, Dow=
nstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that the=
 </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Cour=
ier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">is=
 one of the SIDs defined in Sections 3, 4 and 5&nbsp; of </span><a href=3D=
"https://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A%2F=
%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">RFC8402</span></a><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">?<o:p></o:p></sp=
an></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID not a topological SID as defined the sections you point to in =
RFC 8402. Instead, it is a separate SID (label in SR-MPLS) that represents=
 the Replication segment in data plane.<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]] </=
span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#00B0F0">Oops! This question got mangled in the =
process of writing. Actually I wanted to ask whether the SIDs in the list =
that represent a specific Replication Branch are the SIDs defined in RFC 8=
204. The text I see in the </span></i></b><a href=3D"https://clicktime.sym=
antec.com/3KYcTh6w8kroEVd6FFNtXYc6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fht=
ml%2Fdraft-voyer-pim-sr-p2mp-policy-00"><b><i><span style=3D"font-size:11.=
0pt;font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span></i><=
/b></a><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quo=
t;,sans-serif;color:#1F497D"> </span></i></b><b><i><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B0F0">draft s=
eems to suggest that it is not necessarily so &nbsp;because a Tree-SID is =
considered also as the Replication SID. This looks inconsistent to me beca=
use a Replication SID as defined in this draft is instantiated both in the=
 Replication node and in the Downstream nodes while the Tree-SID does not =
require instantiation in the Leaf nodes (this is optional). </span></i></b=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f;color:#1F497D"><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l4 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at</span> &#8220;<span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">A Replication branch to a particular Downstream No=
de could be represented by the node's Node </span><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">SID</span=
><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-seri=
f">&#8221;. &nbsp;Does this mean that the Replication Node sends the packe=
ts it receives with the Replication SID as the active segment with the lab=
els representing the downstream Node SID as the active segment across such=
 a replication branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] No, Repl=
ication SID relevant at a downstream node would be the bottom label with o=
ther SIDs stacked on top which would guide the packet to the downstream no=
de. Of course, if the Downstream node is adjacent to the Replication node,=
 only the Replication SID would be present in the outgoing packet<span sty=
le=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, thanks</i></b></span><b><i><span=
 style=3D"color:#1F497D">. </span></i></b><span style=3D"color:#1F497D">&n=
bsp;</span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l4 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&=
quot;Courier New&quot;">Replication segment is instantiated at Downstream =
nodes and at the Replication node</span><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean th=
at the list of SIDs associated with the specific replication Branch is pus=
hed by the Replication Node on top of the label representing the Replicati=
on SID in the Downstream node of this branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Yes. See=
 response to 2 above<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, tha=
nks again.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l4 level1 lfo8"><![if !supportLists]><span lang=3D"EN" style=3D=
"font-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"mso-=
list:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </s=
pan></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Are the labels that=
 represent the Replication SID at the Downstream nodes downstream-allocate=
d by these nodes or upstream-allocated by the replication node?</span><spa=
n lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot=
;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] Since th=
e Replication SID is locally relevant at a node, the Replication SID would=
 be downstream-allocated. However, it may also be allocated by PCE; see re=
sponse to 5, 6 below<span style=3D"color:#00B0F0">.<b><i>[[Sasha]] OK, tha=
nks.</i></b> </span><o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span lang=3D"E=
N" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;"><o:p>&nb=
sp;</o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l4 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says th=
at &nbsp;&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-fa=
mily:&quot;Courier New&quot;">A Replication segment can be either provisio=
ned locally on a node or programmed by a PCE</span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">&#8221;. These two op=
tions look exactly the same to me from the POV of the node on which the Re=
plication segment is programmed - what, if anything, did I miss?<o:p></o:p=
></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] You are =
right in that it does not matter how Replication segment is instantiated a=
t a node. The use of PCE is relevant for </span><a href=3D"https://clickti=
me.symantec.com/3BarcmSMhmQoNnLWirtL2F6H2?u=3Dhttps%3A%2F%2Fdatatracker.ie=
tf.org%2Fdoc%2Fdraft-voyer-pim-sr-p2mp-policy%2F"><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">SR P2MP Policy</span><=
/a><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-se=
rif"> draft where PCE instantiates Replication segments<span style=3D"colo=
r:#00B0F0">.<b><i>[[Sasha]] OK, I will &nbsp;look up the second draft. BTW=
, it does not appear as a reference in this one &#8211; is it intentional?=
</i></b> <o:p></o:p></span></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l4 level1 lfo8"><![if !supportLists]><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-lis=
t:Ignore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </span=
></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a pos=
sibility of advertising the Replication Segment from the Downstream nodes =
to the Replication one using some multicast routing protocol (e.g., creati=
ng a SR-MPLS replacement for mLDP)? Or is such a possibility strictly prec=
luded?<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;page-break-before:always"><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">[RP] . We do =
not strictly preclude any protocol , but one of the goals of SR is to simp=
lify. The idea is same here - use replication segments to realize P2MP tre=
es computed by PCE (without need of multicast protocols) as specified in S=
R P2MP draft<b><i><span style=3D"color:#00B0F0">[[Sasha]] One of the well-=
known aspects that make multicast different is that the traffic in the Ser=
vice Provider domain is driven by the dynamic customer requests. Handling =
these requests via a PCE looks problematic to me. </span></i></b><span sty=
le=3D"color:#00B0F0"><o:p></o:p></span></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiat=
ion of the Replication Segment in SR-MPLS would be highly appreciated.<o:p=
></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">[RP]SR P2MP policy draft lists d=
ifferent protocols (PCEP, BGP, etc.) that can be used to instantiate Repli=
cation segments. </span><a href=3D"https://clicktime.symantec.com/3JuFtE8q=
kd9Viz4Z8BMaLWb6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-dhs-spr=
ing-pce-sr-p2mp-policy-00"><span style=3D"font-size:11.0pt;font-family:&qu=
ot;Calibri&quot;,sans-serif">SR P2MP PCEP</span></a><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> would be updated; o=
ther drafts will be published in future.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt"><o:p>&nbsp;</o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">More of the same...<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">Pleade note that if the anser to #3 in my original message is positi=
ve, then the statement in the draft that say the Replication Segment is si=
milar to the Binding segment srems to be
 inaccurate.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"color:#21=
2121">[RP] Since Replication SID is local to a Node, the Replication SID o=
f the Replication segment at Root (or Headend) node can be used as a (cons=
tant) Binding SID to steer traffic into the
 segment.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:white"><b><i><span style=3D"col=
or:#00B0F0">[[Sasha]] The difference between the Binding SID as defined in=
 8204 and the Replication SID as defined here is that the former is instan=
tiated just locally while the Replication
 SID is instantiated both in the Replication node and in the Downstream no=
des.</span></i></b><span style=3D"color:#00B0F0"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">-Ris=
habh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p=
>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Tuesday, October 15, 2019 6:31 AM<br>
<b>To:</b> <a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</a=
>; Clarence Filsfils (cfilsfil) &lt;<a href=3D"mailto:cfilsfil@cisco.com">=
cfilsfil@cisco.com</a>&gt;; Rishabh Parekh (riparekh) &lt;<a href=3D"mailt=
o:riparekh@cisco.com">riparekh@cisco.com</a>&gt;;
<a href=3D"mailto:hooman.bidgoli@nokia.com">hooman.bidgoli@nokia.com</a>; =
<a href=3D"mailto:zzhang@juniper.net">
zzhang@juniper.net</a><br>
<b>Cc:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> Some questions regarding Replication SID<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear colleagues,<o:p></o:p></p>
<p class=3D"MsoNormal">I have read the <a href=3D"https://clicktime.symant=
ec.com/3G11JyktvUDpkKaz5dfYE9E6H2?u=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%=
2Fdraft-voyer-spring-sr-replication-segment-00">
Replication SID draft</a>, and I have a few questions dealing with possibl=
e instantiation of the Replication SOD in
<a href=3D"https://clicktime.symantec.com/3Hq42mK61kxvw5A1kBS8D1g6H2?u=3Dh=
ttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-spring-segment-routing-mpl=
s-22">
SR-MPLS</a>.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo10"><![if !supportLists]><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-li=
st:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </spa=
n></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft says that &=
#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot=
;Courier New&quot;">each branch is abstracted=20to a &lt;Downstream Node, =
Downstream Replication-SID&gt;</span><span style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean that =
the </span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;C=
ourier New&quot;">Downstream Replication-SID</span><span lang=3D"EN" style=
=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> </span><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"=
>is one of the SIDs defined in Sections 3, 4 and 5&nbsp; of </span><a href=
=3D"https://clicktime.symantec.com/3XUuhGHPMpikj1KmCoXg6zn6H2?u=3Dhttps%3A=
%2F%2Ftools.ietf.org%2Fhtml%2Frfc8402"><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif">RFC8402</span></a><span style=3D"=
font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">? <o:p></o:p>=
</span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo10"><![if !supportLists]><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-li=
st:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </spa=
n></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says t=
hat</span> &#8220;<span lang=3D"EN" style=3D"font-size:12.0pt;font-family:=
&quot;Courier New&quot;">A Replication branch to a particular Downstream N=
ode could be represented by the node's Node </span><span lang=3D"EN" style=
=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">SID</s=
pan><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">&#8221;. &nbsp;Does this mean that the Replication Node sends the pa=
ckets it receives with the Replication SID as the active segment with the =
labels representing the downstream Node SID as the active segment across s=
uch a replication branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo10"><![if !supportLists]><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-li=
st:Ignore">3.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </spa=
n></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says t=
hat &#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:=
&quot;Courier New&quot;">Replication segment is instantiated at Downstream=
 nodes and at the Replication node</span><span style=3D"font-size:11.0pt;f=
ont-family:&quot;Calibri&quot;,sans-serif">&#8221;. &nbsp;Does that mean t=
hat the list of SIDs associated with the specific replication Branch is pu=
shed by the Replication Node on top of the label representing the Replicat=
ion SID in the Downstream node of this branch?<o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo10"><![if !supportLists]><span lang=3D"EN" style=
=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;"><span style=3D"m=
so-list:Ignore">4.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> =
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Are the labels t=
hat represent the Replication SID at the Downstream nodes downstream-alloc=
ated by these nodes or upstream-allocated by the replication node? </span>=
<span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&=
quot;"><o:p></o:p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo10"><![if !supportLists]><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-li=
st:Ignore">5.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </spa=
n></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">The draft also says t=
hat &nbsp;&#8220;</span><span lang=3D"EN" style=3D"font-size:12.0pt;font-f=
amily:&quot;Courier New&quot;">A Replication segment can be either provisi=
oned locally on a node or programmed by a PCE</span><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">&#8221;. These two o=
ptions look exactly the same to me from the POV of the node on which the R=
eplication segment is programmed - what, if anything, did I miss?<o:p></o:=
p></span></pre>
<pre style=3D"margin-left:54.0pt;text-indent:-18.0pt;page-break-before:alw=
ays;mso-list:l0 level1 lfo10"><![if !supportLists]><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"mso-li=
st:Ignore">6.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"> </spa=
n></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"font-siz=
e:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Did you consider a po=
ssibility of advertising the Replication Segment from the Downstream nodes=
 to the Replication one using some multicast routing protocol (e.g., creat=
ing a SR-MPLS replacement for mLDP)? Or is such a possibility strictly pre=
cluded?<o:p></o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"page-break-before:always"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">Any details regarding instantiat=
ion of the Replication Segment in SR-MPLS would be highly appreciated.<o:p=
></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><br>
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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "Rishabh Parekh (riparekh)" <riparekh@cisco.com>
CC: "spring@ietf.org" <spring@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>
Thread-Topic: Some questions regarding Replication SID
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Subject: Re: [spring] Some questions regarding Replication SID
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Thread-Topic: Protocol Action: 'IPv6 Segment Routing Header (SRH)' to Proposed Standard (draft-ietf-6man-segment-routing-header-26.txt)
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Subject: Re: [spring] [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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Greetings: 

 

I will be tallying the results for the extended week late today.  If anyone
wishes to comment on the adoption, please do so today. 

 

Sue Hares 

 

From: Idr <idr-bounces@ietf.org> On Behalf Of Susan Hares
Sent: 14 October 2019 23:43
To: 'idr wg' <idr@ietf.org>; 'SPRING WG List' <spring@ietf.org>
Subject: Re: [Idr] Adoption:
draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and
draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to
10/21/2019]

 

Greetings IDR and Spring WG

 

The WG Adoption for the two IDR drafts related to IDR received a level
support below the threshold to accept this draft into the IDR WG.  There
were no objection, but there was simply a low level of response. 

 

This 1 week extension to the Adoption call is to let the members of both the
IDR and SPRING WG comment on whether these drafts have matured enough to be
IDR WG drafts.  On 10/21/2019, the IDR chairs will make a determination of
whether either of these two drafts have enough support to be accepted. 

 

Thank you,  Susan  Hares

IDR co-chair 

 

From: Idr [ <mailto:idr-bounces@ietf.org> mailto:idr-bounces@ietf.org] On
Behalf Of Susan Hares
Sent: Tuesday, September 17, 2019 12:35 PM
To: 'idr wg'
Subject: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt
and draft-li-sr-policy-path-segment-01.txt [9/17 to 10/1/2019]

 

This begins a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019]


.        draft-li-bgp-ls-sr-policy-path-segment-03.txt and 

.        draft-li-idr-sr-policy-path-segment-01.txt. 

 

You can access these two drafts at the following location: 

 

https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-path-segment/

 

https://datatracker.ietf...org/doc/draft-li-idr-sr-policy-path-segment/
<https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segment/> 

 

The authors have pointed out that the adoption of this 

draft since the following  SR-MPLS Path Segment draft has been adopted: 

 

https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00

 

Please consider the following questions in your responses? 

 

1.	Should this SR Policy technology be included in BGP for SR-MPLS 

 

Spring has adopted the draft, but IDR can provide feedback 

to spring about putting this technology in BGP.

 

2.	Is this technology a good way to implement the required 

Features in BGP? 

 

3.	Is this technology ready for adoption? 

 

4.	Do you have any concerns about adopting this technology? 

 

 

Cheers, Susan Hares 


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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Greetings: <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>I will be tallying the =
results for the extended week late today.&nbsp; If anyone wishes to =
comment on the adoption, please do so today. <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Sue Hares =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-IN><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Idr &lt;<a =
href=3D"mailto:idr-bounces@ietf.org">idr-bounces@ietf.org</a>&gt; <b>On =
Behalf Of </b>Susan Hares<br><b>Sent:</b> 14 October 2019 =
23:43<br><b>To:</b> 'idr wg' &lt;<a =
href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&gt;; 'SPRING WG List' =
&lt;<a =
href=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;<br><b>Subject:</b=
> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt =
and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to =
10/21/2019]<o:p></o:p></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-IN><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Greetings IDR and Spring =
WG<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>The WG Adoption for the =
two IDR drafts related to IDR received a level support below the =
threshold to accept this draft into the IDR WG.&nbsp; There were no =
objection, but there was simply a low level of response. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>This 1 week extension to =
the Adoption call is to let the members of both the IDR and SPRING WG =
comment on whether these drafts have matured enough to be IDR WG drafts. =
&nbsp;On 10/21/2019, the IDR chairs will make a determination of whether =
either of these two drafts have enough support to be accepted. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Thank you,&nbsp; =
Susan&nbsp; Hares<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>IDR co-chair <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
Idr [</span><a href=3D"mailto:idr-bounces@ietf.org"><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>mailto:idr-b=
ounces@ietf.org</span></a><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>] <b>On =
Behalf Of </b>Susan Hares<br><b>Sent:</b> Tuesday, September 17, 2019 =
12:35 PM<br><b>To:</b> 'idr wg'<br><b>Subject:</b> [Idr] Adoption: =
draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and =
draft-li-sr-policy-path-segment-01.txt [9/17 to =
10/1/2019]<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>This begins =
a 2 week WG Adoption call two related drafts [9/17 to 10/1/2019] =
<o:p></o:p></p><p class=3DMsoNormal =
style=3D'margin-left:38.25pt;text-indent:-.25in;mso-list:l4 level1 =
lfo17'><![if !supportLists]><span =
style=3D'font-size:10.0pt;font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span =
dir=3DLTR></span>draft-li-bgp-ls-sr-policy-path-segment-03.txt and =
<o:p></o:p></p><p class=3DMsoNormal =
style=3D'margin-left:38.25pt;text-indent:-.25in;mso-list:l4 level1 =
lfo17'><![if !supportLists]><span =
style=3D'font-size:10.0pt;font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span =
dir=3DLTR></span>draft-li-idr-sr-policy-path-segment-01.txt. =
<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>You can access these two drafts at the following =
location: <o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><a =
href=3D"https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-policy-pa=
th-segment/">https://datatracker.ietf.org/doc/draft-li-idr-bgp-ls-sr-poli=
cy-path-segment/</a><o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><a =
href=3D"https://datatracker.ietf.org/doc/draft-li-idr-sr-policy-path-segm=
ent/">https://datatracker.ietf...org/doc/draft-li-idr-sr-policy-path-segm=
ent/</a><o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>The authors have pointed out that the adoption of this =
<o:p></o:p></p><p class=3DMsoNormal>draft since the following =
&nbsp;SR-MPLS Path Segment draft has been adopted: <o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><a =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-0=
0">https://tools.ietf.org/html/draft-ietf-spring-mpls-path-segment-00</a>=
<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Please consider the following questions in your =
responses? <o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><ol =
style=3D'margin-top:0in' start=3D1 type=3D1><li class=3DMsoNormal =
style=3D'mso-list:l19 level1 lfo18'>Should this SR Policy technology be =
included in BGP for SR-MPLS <o:p></o:p></li></ol><p =
class=3DMsoListParagraph><o:p>&nbsp;</o:p></p><p =
class=3DMsoListParagraph>Spring has adopted the draft, but IDR can =
provide feedback <o:p></o:p></p><p class=3DMsoListParagraph>to spring =
about putting this technology in BGP.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><ol style=3D'margin-top:0in' =
start=3D2 type=3D1><li class=3DMsoNormal style=3D'mso-list:l13 level1 =
lfo19'>Is this technology a good way to implement the required =
<o:p></o:p></li></ol><p class=3DMsoListParagraph>Features in BGP? =
<o:p></o:p></p><p class=3DMsoListParagraph><o:p>&nbsp;</o:p></p><ol =
style=3D'margin-top:0in' start=3D3 type=3D1><li class=3DMsoNormal =
style=3D'mso-list:l2 level1 lfo20'>Is this technology ready for =
adoption? <o:p></o:p></li></ol><p =
class=3DMsoListParagraph><o:p>&nbsp;</o:p></p><ol =
style=3D'margin-top:0in' start=3D4 type=3D1><li class=3DMsoNormal =
style=3D'mso-list:l6 level1 lfo21'>Do you have any concerns about =
adopting this technology? <o:p></o:p></li></ol><p =
class=3DMsoListParagraph><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Cheers, =
Susan Hares <o:p></o:p></p></div></body></html>
------=_NextPart_000_02F0_01D58A5B.1C3637F0--


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From: "Rishabh Parekh (riparekh)" <riparekh@cisco.com>
To: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
CC: "spring@ietf.org" <spring@ietf.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "hooman.bidgoli@nokia.com" <hooman.bidgoli@nokia.com>, "daniel.voyer@bell.ca" <daniel.voyer@bell.ca>
Thread-Topic: Some questions regarding Replication SID
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Date: Thu, 24 Oct 2019 17:59:02 +0000
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Subject: Re: [spring] Some questions regarding Replication SID
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From nobody Fri Oct 25 02:29:03 2019
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Subject: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-05.txt
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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 Source Packet Routing in Networking WG of the IETF.

        Title           : SRv6 Network Programming
        Authors         : Clarence Filsfils
                          Pablo Camarillo Garvia
                          John Leddy
                          Daniel Voyer
                          Satoru Matsushima
                          Zhenbin Li
	Filename        : draft-ietf-spring-srv6-network-programming-05.txt
	Pages           : 41
	Date            : 2019-10-25

Abstract:
   This document describes the SRv6 network programming concept and its
   most basic functions.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-network-programming/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-05
https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-network-programming-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-srv6-network-programming-05


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: "spring@ietf.org" <spring@ietf.org>
CC: "spring-chairs@ietf.org" <spring-chairs@ietf.org>, draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: Ron Bonica <rbonica@juniper.net>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] More USP questions
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From: "Chengli (Cheng Li)" <chengli13@huawei.com>
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Thread-Topic: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/2019]
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</head>
<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Hi Susan, IDRers and SPRINGers,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Many thanks for all your work, contributions and attentions.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Your comments help a lot on these documents and me as well for su=
re.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Will upload the documents ASAP.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Also, I will collect the comments and share to the WGs, as well a=
s the planning to refine, and implementation status.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Thanks again! See you guys in Singapore.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Cheng<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif">=B7=A2=BC=FE=C8=CB<span lang=3D"EN-US">:</span>=
</span></b><span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif"> Idr [mailto:idr-bounces@ietf.org]
</span><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,s=
ans-serif">=B4=FA=B1=ED </span></b><span lang=3D"EN-US" style=3D"font-famil=
y:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">Susan Hares<br>
</span><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,s=
ans-serif">=B7=A2=CB=CD=CA=B1=BC=E4<span lang=3D"EN-US">:</span></span></b>=
<span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&qu=
ot;,sans-serif"> 2019</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=
=D1=C5=BA=DA&quot;,sans-serif">=C4=EA<span lang=3D"EN-US">10</span>=D4=C2<s=
pan lang=3D"EN-US">25</span>=C8=D5<span lang=3D"EN-US">
 22:33<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> 'idr wg' &lt;idr@ietf.org&gt;<br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> Re: [Idr] Adoption: draft-li-idr-bgp-ls-sr-policy-path-segment-03.txt and=
 draft-li-sr-policy-path-segment-01.txt - 1 week extension [10/14 to 10/21/=
2019]<o:p></o:p></span></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Greeting: <o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It seems I asked the questions =
about these two drafts to the correct places (IDR and Spring).
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">These two drafts have enough in=
terest to become IDR WG drafts.&nbsp; Please submit the following:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.25pt;text-indent:-18.=
0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">draft-li-idr-bgp-ls-sr-=
policy-path-segment-03.txt &nbsp;as draft-ietf-idr-bgp-ls-sr-policy-path-se=
gment-0.txt<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.25pt;text-indent:-18.=
0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol"><spa=
n style=3D"mso-list:Ignore">=A1=A4<span style=3D"font:7.0pt &quot;Times New=
 Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">draft-li-sr-policy-path=
-segment-01.txt as draft-ietf-idr-sr-policy-path-segment-00.txt.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The authors should carefully pa=
y attention to the email.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I expect from the authors to se=
nd an email to IDR with the following:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">a)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">&nbsp;a summary of comm=
ents received on WG adoption call,
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">b)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Plans for refining and =
progressing their drafts, and
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">c)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">status of any implement=
ations.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">A big thanks to all who comment=
 on these drafts.&nbsp; A special thanks to Bruno Decraene who provided ext=
ra insight on the links to Spring technologies.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Susan Hares<o:p></o:p></span></=
p>
</div>
</body>
</html>

--_000_C7C2E1C43D652C4E9E49FE7517C236CB02752595dggeml509mbschi_--


From nobody Fri Oct 25 14:19:11 2019
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Subject: [spring] spring - Requested sessions have been scheduled for IETF 106
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Dear Bruno Decraene,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    spring Session 1 (2:00 requested)
    Monday, 18 November 2019, Morning Session I 1000-1200
    Room Name: Padang size: 300
    ---------------------------------------------
    spring Session 2 (1:00 requested)
    Thursday, 21 November 2019, Afternoon Session II 1550-1720
    Room Name: Canning size: 250
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/106/sessions/spring.ics

Request Information:


---------------------------------------------------------
Working Group Name: Source Packet Routing in Networking
Area Name: Routing Area
Session Requester: Bruno Decraene

Number of Sessions: 2
Length of Session(s):  1 Hour, 2 Hours
Number of Attendees: 140
Conflicts to Avoid: 

 Technology Overlap: 6man mpls lsr idr pce



People who must be present:
  Bruno Decraene
  Martin Vigoureux
  Rob Shakir

Resources Requested:

Special Requests:
  If it&#39;s not possible to address all conflicts, chairs will try to schedule 6MAN related content in the first session and MPLS related content during the second session.
---------------------------------------------------------


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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/eMMugRQ7Ed7-nRCOEdttKS8UTUU>
Subject: [spring] Proposal of new SRv6 proxy behavior: Tagging proxy
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Dear All,

My name is Yukito Ueno at NTT Communications.

Please let me introduce a new draft, "SRv6 Tagging proxy" and its backgroun=
d. SRv6 Tagging proxy is
a new variant of SRv6 dynamic proxy defined in [draft-ietf-spring-sr-servic=
e-programming-00].
This new proxy mechanism supports multiple IPv4 service chains encapsulated=
 in SRv6 header by
one SRv6 proxy node (of course Tagging proxy also supports IPv6 service cha=
ins).

In addition, we implemented the tagging proxy for use in the large demonstr=
ation network in Japan,
which is called ShowNet. ShowNet is built at Interop Tokyo, one of the bigg=
est ICT events in Japan
held every June. This year, we deployed SRv6 to provide service chains for =
over 200 exhibitors and
over 155,000 visitors. The whole design and knowledge gained from it will a=
lso be published
as a separate document.

We would like to share the knowledge about this at IETF 106 and appreciate =
any comments.

Regards,
Yukito Ueno

-----Original Message-----
From: mailto:internet-drafts@ietf.org <mailto:internet-drafts@ietf.org>
Sent: Sunday, October 27, 2019 8:27 PM
To: Yukito Ueno=1B$B!J>eLn9,EN!K=1B(B <mailto:yukito.ueno@ntt.com>; Teppei =
Kamata <mailto:tkamata@cisco.comt>; Ryo Nakamura <mailto:upa@haeena.net>
Subject: New Version Notification for draft-eden-srv6-tagging-proxy-00.txt


A new version of I-D, draft-eden-srv6-tagging-proxy-00.txt
has been successfully submitted by Yukito Ueno and posted to the IETF repos=
itory.

Name:		draft-eden-srv6-tagging-proxy
Revision:	00
Title:		SRv6 Tagging proxy
Document date:	2019-10-27
Group:		Individual Submission
Pages:		8
URL:            https://www.ietf.org/internet-drafts/draft-eden-srv6-taggin=
g-proxy-00.txt
Status:         https://datatracker.ietf.org/doc/draft-eden-srv6-tagging-pr=
oxy/
Htmlized:       https://tools.ietf.org/html/draft-eden-srv6-tagging-proxy-0=
0
Htmlized:       https://datatracker.ietf.org/doc/html/draft-eden-srv6-taggi=
ng-proxy


Abstract:
  This document describes the tagging method of SRv6 proxy.  SRv6 proxy
  is an SR endpoint behavior for processing SRv6 traffic on behalf of
  an SR-unaware service.




Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


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From: Linda Dunbar <linda.dunbar@futurewei.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] IETF 106 - SPRING agenda
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SPRING chairs,

Can we get 10 minutes slot for briefing the following draft?
https://datatracker.ietf.org/doc/draft-dunbar-sr-sdwan-over-hybrid-networks=
/
Speaker: Linda Dunbar

We will submit the updated draft before the cutoff date and start the discu=
ssion on the mailing list too.

Linda

From: spring <spring-bounces@ietf.org> On Behalf Of bruno.decraene@orange.c=
om
Sent: Wednesday, October 23, 2019 7:28 AM
To: SPRING WG List <spring@ietf.org>
Cc: spring-chairs@ietf.org
Subject: [spring] IETF 106 - SPRING agenda


Hi SPRING,



The preliminary IETF meeting agenda is at https://datatracker.ietf.org/meet=
ing/106/agenda.html<https://nam03.safelinks.protection.outlook.com/?url=3Dh=
ttps%3A%2F%2Fdatatracker.ietf.org%2Fmeeting%2F106%2Fagenda.html&data=3D02%7=
C01%7Clinda.dunbar%40futurewei.com%7Ca64250d1e1f54ff492c008d757b4832b%7C0fe=
e8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637074305149047822&sdata=3DiSs5Zmt0=
DN3plM0sFvlBKDN6Iw4RI9dnPC1EIcN4PG8%3D&reserved=3D0> .



For IETF 106, we're scheduled to meet twice:

13:30-15:30    Monday Afternoon session I

15:50-17:20    Thursday Afternoon session II





Rob and I would like to ask folks to send requests for presentation slots

in the SPRING meeting. Please indicate:



   - the name of the draft you'd like to present,

   - the speaker's name,

   - the amount of time you would like to be allotted - this should cover

   *both* your presentation and discussion.



If you're planning to present a new non-working group draft, please first

post it to the list. If you're presenting an update to an existing draft,

please send an update mail to the list highlighting the

changes that you've made.



There's a handy check-list for presenting at a SPRING meeting on the wiki

https://trac.ietf.org/trac/spring/wiki/Checklist%20for%20presenting%20at%20=
a%20SPRING%20meeting<https://nam03.safelinks.protection.outlook.com/?url=3D=
https%3A%2F%2Ftrac.ietf.org%2Ftrac%2Fspring%2Fwiki%2FChecklist%2520for%2520=
presenting%2520at%2520a%2520SPRING%2520meeting&data=3D02%7C01%7Clinda.dunba=
r%40futurewei.com%7Ca64250d1e1f54ff492c008d757b4832b%7C0fee8ff2a3b240189c75=
3a1d5591fedc%7C1%7C0%7C637074305149057813&sdata=3DiHYVRxNPUCpDjBwQCbhwxd68L=
7VP6ggyhk9j%2FzRKaEA%3D&reserved=3D0> .



We tend to be oversubscribed on meeting agenda slots -- please consider

carefully whether there are items in your update that really benefit from

face-to-face discussion. If the draft has simply been refreshed since last

time it was presented, with no material changes, please consider not

requesting a slot to make our lives easier!



Please have your requests to us by Friday 2019-11-01. We'd like your

slides *Sunday* November 17th at 10:00 local time at the very latest to giv=
e us time

to be able to put together the materials for remote participants.



Thanks,

Rob & Bruno,


___________________________________________________________________________=
______________________________________________



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<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">SPRING ch=
airs, <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Can we ge=
t 10 minutes slot for briefing the following draft?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><a href=3D"https://datatracker.ietf.org/doc/draft-du=
nbar-sr-sdwan-over-hybrid-networks/">https://datatracker.ietf.org/doc/draft=
-dunbar-sr-sdwan-over-hybrid-networks/</a><o:p></o:p></p>
<p class=3D"MsoNormal">Speaker: Linda Dunbar<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">We will submit the updated draft before the cutoff d=
ate and start the discussion on the mailing list too.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Linda<span style=3D"mso-fareast-language:ZH-CN"><o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:ZH-CN">From:<=
/span></b><span style=3D"mso-fareast-language:ZH-CN"> spring &lt;spring-bou=
nces@ietf.org&gt;
<b>On Behalf Of </b>bruno.decraene@orange.com<br>
<b>Sent:</b> Wednesday, October 23, 2019 7:28 AM<br>
<b>To:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Cc:</b> spring-chairs@ietf.org<br>
<b>Subject:</b> [spring] IETF 106 - SPRING agenda<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre>Hi SPRING,<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>The preliminary IETF meeting agenda is at <span lang=3D"FR"><a href=3D=
"https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatr=
acker.ietf.org%2Fmeeting%2F106%2Fagenda.html&amp;data=3D02%7C01%7Clinda.dun=
bar%40futurewei.com%7Ca64250d1e1f54ff492c008d757b4832b%7C0fee8ff2a3b240189c=
753a1d5591fedc%7C1%7C0%7C637074305149047822&amp;sdata=3DiSs5Zmt0DN3plM0sFvl=
BKDN6Iw4RI9dnPC1EIcN4PG8%3D&amp;reserved=3D0"><span lang=3D"EN-US">https://=
datatracker.ietf.org/meeting/106/agenda.html</span></a></span> .<o:p></o:p>=
</pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>For IETF 106, we're scheduled to meet twice:<o:p></o:p></pre>
<pre>13:30-15:30 &nbsp;&nbsp; Monday Afternoon session I<o:p></o:p></pre>
<pre>15:50-17:20 &nbsp;&nbsp; Thursday Afternoon session II<o:p></o:p></pre=
>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Rob and I would like to ask folks to send requests for presentation sl=
ots<o:p></o:p></pre>
<pre>in the SPRING meeting. Please indicate:<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&nbsp;&nbsp; - the name of the draft you'd like to present,<o:p></o:p>=
</pre>
<pre>&nbsp;&nbsp; - the speaker's name,<o:p></o:p></pre>
<pre>&nbsp;&nbsp; - the amount of time you would like to be allotted - this=
 should cover<o:p></o:p></pre>
<pre>&nbsp;&nbsp; *both* your presentation and discussion.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>If you're planning to present a new non-working group draft, please fi=
rst<o:p></o:p></pre>
<pre>post it to the list. If you're presenting an update to an existing dra=
ft,<o:p></o:p></pre>
<pre>please send an update mail to the list highlighting the<o:p></o:p></pr=
e>
<pre>changes that you've made.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>There's a handy check-list for presenting at a SPRING meeting on the w=
iki<o:p></o:p></pre>
<pre><a href=3D"https://nam03.safelinks.protection.outlook.com/?url=3Dhttps=
%3A%2F%2Ftrac.ietf.org%2Ftrac%2Fspring%2Fwiki%2FChecklist%2520for%2520prese=
nting%2520at%2520a%2520SPRING%2520meeting&amp;data=3D02%7C01%7Clinda.dunbar=
%40futurewei.com%7Ca64250d1e1f54ff492c008d757b4832b%7C0fee8ff2a3b240189c753=
a1d5591fedc%7C1%7C0%7C637074305149057813&amp;sdata=3DiHYVRxNPUCpDjBwQCbhwxd=
68L7VP6ggyhk9j%2FzRKaEA%3D&amp;reserved=3D0">https://trac.ietf.org/trac/spr=
ing/wiki/Checklist%20for%20presenting%20at%20a%20SPRING%20meeting</a> .<o:p=
></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>We tend to be oversubscribed on meeting agenda slots -- please conside=
r<o:p></o:p></pre>
<pre>carefully whether there are items in your update that really benefit f=
rom<o:p></o:p></pre>
<pre>face-to-face discussion. If the draft has simply been refreshed since =
last<o:p></o:p></pre>
<pre>time it was presented, with no material changes, please consider not<o=
:p></o:p></pre>
<pre>requesting a slot to make our lives easier!<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Please have your requests to us by Friday 2019-11-01. We'd like your<o=
:p></o:p></pre>
<pre>slides *<b>Sunday</b>* November 17th at 10:00 local time at the very l=
atest to give us time<o:p></o:p></pre>
<pre>to be able to put together the materials for remote participants.<o:p>=
</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><span lang=3D"FR">Thanks,<o:p></o:p></span></pre>
<pre><span lang=3D"FR">Rob &amp; Bruno,<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
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<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
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<pre><span lang=3D"FR">If you have received this email in error, please not=
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<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
</div>
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From: "Kamran Raza (skraza)" <skraza@cisco.com>
To: "spring@ietf.org" <spring@ietf.org>
CC: "draft-raza-spring-srv6-yang@ietf.org" <draft-raza-spring-srv6-yang@ietf.org>
Thread-Topic: Re New Version Notification for draft-raza-spring-srv6-yang-05.txt]
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From: Yukito Ueno <yukito.ueno@ntt.com>
To: "'bruno.decraene@orange.com'" <bruno.decraene@orange.com>, "spring-chairs@ietf.org" <spring-chairs@ietf.org>
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Subject: Re: [spring] IETF 106 - SPRING agenda
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Dear SPRING chairs,

We would like to request a presentation time slot.

- I-D: https://tools.ietf.org/html/draft-eden-srv6-tagging-proxy-00
- Speaker: Yukito Ueno
- Desired time: 10 minutes
- Short introduction: https://mailarchive.ietf.org/arch/msg/spring/eMMugRQ7=
Ed7-nRCOEdttKS8UTUU

Regards,
Yukito Ueno

From: spring <spring-bounces@ietf.org> On Behalf Of bruno.decraene@orange.c=
om
Sent: Wednesday, October 23, 2019 9:28 PM
To: SPRING WG List <spring@ietf.org>
Cc: spring-chairs@ietf.org
Subject: [spring] IETF 106 - SPRING agenda

Hi SPRING,

The preliminary IETF meeting agenda is at https://datatracker.ietf.org/meet=
ing/106/agenda.html .

For IETF 106, we're scheduled to meet twice:
13:30-15:30 	Monday Afternoon session I
15:50-17:20 	Thursday Afternoon session II


Rob and I would like to ask folks to send requests for presentation slots
in the SPRING meeting. Please indicate:

   - the name of the draft you'd like to present,
   - the speaker's name,
   - the amount of time you would like to be allotted - this should cover
   *both* your presentation and discussion.

If you're planning to present a new non-working group draft, please first
post it to the list. If you're presenting an update to an existing draft,
please send an update mail to the list highlighting the
changes that you've made.

There's a handy check-list for presenting at a SPRING meeting on the wiki
https://trac.ietf.org/trac/spring/wiki/Checklist%20for%20presenting%20at%20=
a%20SPRING%20meeting .

We tend to be oversubscribed on meeting agenda slots -- please consider
carefully whether there are items in your update that really benefit from
face-to-face discussion. If the draft has simply been refreshed since last
time it was presented, with no material changes, please consider not
requesting a slot to make our lives easier!

Please have your requests to us by Friday 2019-11-01. We'd like your
slides *Sunday* November 17th at 10:00 local time at the very latest to giv=
e us time
to be able to put together the materials for remote participants.

Thanks,
Rob & Bruno,

___________________________________________________________________________=
______________________________________________

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From nobody Thu Oct 31 07:01:16 2019
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Subject: [spring] An Experiment of SRv6 Service Chaining at Interop Tokyo
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Dear All,

I'm Ryo Nakamura, a research associate at the University of Tokyo.

We conducted an experimental deployment of SRv6 service chaining with =
four SRv6-capable nodes, five SRv6 proxy nodes, and six SR-unaware =
services at Interop Tokyo 2019 ShowNet. It successfully provided network =
connectivity and services to all the exhibitors (over 200 booths) and =
visitors (over 155,000) during the period of Interop Tokyo, from June 12 =
to June 14, 2019.

Through the experiment, we made several observations about service =
programming with segment routing from both implementation and =
specification perspectives. A new draft, =
draft-upa-srv6-service-chaining-exp-00.txt, shares these lessons learned =
from the experiment:

- Transparency of SRv6 header
- Services that cannot co-exist with End.AM
- Service liveness detection and conditional advertisement of service =
segments
- TTL Decrement on SRv6 Proxies
- Control Plane Capabilities
- Match Condition for Applying SRv6 Functions


I hope it would help the community.

Sincerely,
Ryo Nakamura



A new version of I-D, draft-upa-srv6-service-chaining-exp-00.txt
has been successfully submitted by Ryo Nakamura and posted to the
IETF repository.

Name:		draft-upa-srv6-service-chaining-exp
Revision:	00
Title:		An Experiment of SRv6 Service Chaining at Interop Tokyo =
2019 ShowNet
Document date:	2019-10-30
Group:		Individual Submission
Pages:		10
URL:            =
https://www.ietf.org/internet-drafts/draft-upa-srv6-service-chaining-exp-0=
0.txt
Status:         =
https://datatracker.ietf.org/doc/draft-upa-srv6-service-chaining-exp/
Htmlized:       =
https://tools.ietf.org/html/draft-upa-srv6-service-chaining-exp-00
Htmlized:       =
https://datatracker.ietf.org/doc/html/draft-upa-srv6-service-chaining-exp




Please note that it may take a couple of minutes from the time of =
submission
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat=


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From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 31 Oct 2019 20:36:40 +0100
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Subject: Re: [spring] FW: New Version Notification for draft-bonica-6man-crh-helper-opt-00.txt
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Hi Ron,

If you are excluding the SFIBH length shouldn't the max legal value be 18
(16+1+1) and not 19 octets ?

Likewise I am a bit not clear about the min 2 octets ? Does this mean that
High SID index is optional as in that case one could indeed imagine just
Low SID index + 1 octet v6 prefix. If not I think it should be 3-18 not
2-19.

   o  SFIBH Length - (8-bits) Length of the SFIBH, in octets, *excluding
      SFIBH Length.*  Value MUST be greater than 2 and less than 19.


Thx,
R.



On Thu, Oct 31, 2019 at 7:25 PM Ron Bonica <rbonica=
40juniper.net@dmarc.ietf.org> wrote:

> Please review this draft
>
>
> Juniper Business Use Only
>
> -----Original Message-----
> From: internet-drafts@ietf.org <internet-drafts@ietf.org>
> Sent: Thursday, October 31, 2019 2:21 PM
> To: Ron Bonica <rbonica@juniper.net>; Xing Li <xing@cernet.edu.cn>;
> Congxiao Bao <congxiao@cernet.edu>; Eddie Ruan <eddie.ruan@fungible.com>
> Subject: New Version Notification for
> draft-bonica-6man-crh-helper-opt-00.txt
>
>
> A new version of I-D, draft-bonica-6man-crh-helper-opt-00.txt
> has been successfully submitted by Ron Bonica and posted to the IETF
> repository.
>
> Name:           draft-bonica-6man-crh-helper-opt
> Revision:       00
> Title:          Compressed Routing Header (CRH) Helper Option
> Document date:  2019-10-31
> Group:          Individual Submission
> Pages:          7
> URL:
> https://tools.ietf.org/html/draft-bonica-6man-crh-helper-opt-00
>
> Abstract:
>    This document defines the IPv6 CRH Helper option.  When an SRm6
>    ingress node originates a packet, it can use the IPv6 CRH Helper
>    option to provide SID Forwarding Information Base (SFIB) information
>    to downstream nodes that do not maintain a complete SFIB.
>
>
>
>
> Please note that it may take a couple of minutes from the time of
> submission until the htmlized version and diff are available at
> tools.ietf.org.
>
> The IETF Secretariat
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>

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<div dir=3D"ltr">Hi Ron,<div><br></div><div>If you are excluding the SFIBH=
=C2=A0length shouldn&#39;t the max legal value be 18 (16+1+1) and not 19 oc=
tets=C2=A0?=C2=A0</div><div><br></div><div>Likewise I am a bit not clear ab=
out the min 2 octets ? Does this mean that High SID index is optional as in=
 that case one could indeed imagine just Low SID index=C2=A0+ 1 octet v6 pr=
efix. If not I think it should be 3-18 not 2-19.</div><div><br></div><div><=
pre class=3D"gmail-newpage" style=3D"font-size:13.3333px;margin-top:0px;mar=
gin-bottom:0px;break-before:page;color:rgb(0,0,0)">   o  SFIBH Length - (8-=
bits) Length of the SFIBH, in octets, <b>excluding
      SFIBH Length.</b>  Value MUST be greater than 2 and less than 19.</pr=
e><pre class=3D"gmail-newpage" style=3D"font-size:13.3333px;margin-top:0px;=
margin-bottom:0px;break-before:page;color:rgb(0,0,0)"><br></pre><pre class=
=3D"gmail-newpage" style=3D"font-size:13.3333px;margin-top:0px;margin-botto=
m:0px;break-before:page;color:rgb(0,0,0)">Thx,
R.</pre><pre class=3D"gmail-newpage" style=3D"font-size:13.3333px;margin-to=
p:0px;margin-bottom:0px;break-before:page;color:rgb(0,0,0)"><br></pre></div=
></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr"=
>On Thu, Oct 31, 2019 at 7:25 PM Ron Bonica &lt;rbonica=3D<a href=3D"mailto=
:40juniper.net@dmarc.ietf.org">40juniper.net@dmarc.ietf.org</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">Please review th=
is draft<br>
<br>
<br>
Juniper Business Use Only<br>
<br>
-----Original Message-----<br>
From: <a href=3D"mailto:internet-drafts@ietf.org" target=3D"_blank">interne=
t-drafts@ietf.org</a> &lt;<a href=3D"mailto:internet-drafts@ietf.org" targe=
t=3D"_blank">internet-drafts@ietf.org</a>&gt; <br>
Sent: Thursday, October 31, 2019 2:21 PM<br>
To: Ron Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_blank"=
>rbonica@juniper.net</a>&gt;; Xing Li &lt;<a href=3D"mailto:xing@cernet.edu=
.cn" target=3D"_blank">xing@cernet.edu.cn</a>&gt;; Congxiao Bao &lt;<a href=
=3D"mailto:congxiao@cernet.edu" target=3D"_blank">congxiao@cernet.edu</a>&g=
t;; Eddie Ruan &lt;<a href=3D"mailto:eddie.ruan@fungible.com" target=3D"_bl=
ank">eddie.ruan@fungible.com</a>&gt;<br>
Subject: New Version Notification for draft-bonica-6man-crh-helper-opt-00.t=
xt<br>
<br>
<br>
A new version of I-D, draft-bonica-6man-crh-helper-opt-00.txt<br>
has been successfully submitted by Ron Bonica and posted to the IETF reposi=
tory.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-bonica-6man-crh-helper-=
opt<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A000<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Compressed Routing Header (CRH) He=
lper Option<br>
Document date:=C2=A0 2019-10-31<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 7<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://tools.ietf=
.org/html/draft-bonica-6man-crh-helper-opt-00" rel=3D"noreferrer" target=3D=
"_blank">https://tools.ietf.org/html/draft-bonica-6man-crh-helper-opt-00</a=
><br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This document defines the IPv6 CRH Helper option.=C2=A0 When a=
n SRm6<br>
=C2=A0 =C2=A0ingress node originates a packet, it can use the IPv6 CRH Help=
er<br>
=C2=A0 =C2=A0option to provide SID Forwarding Information Base (SFIB) infor=
mation<br>
=C2=A0 =C2=A0to downstream nodes that do not maintain a complete SFIB.<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at <a href=3D"http://to=
ols.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
The IETF Secretariat<br>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
</blockquote></div>

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