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Re: [spring] SRv6 SID List compression

"Darren Dukes (ddukes)" <ddukes@cisco.com> Tue, 27 July 2021 01:34 UTC

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From: "Darren Dukes (ddukes)" <ddukes@cisco.com>
To: Gyan Mishra <hayabusagsm@gmail.com>
CC: SPRING WG <spring@ietf.org>
Thread-Topic: [spring] SRv6 SID List compression
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Date: Tue, 27 Jul 2021 01:34:44 +0000
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Subject: Re: [spring] SRv6 SID List compression
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Hi Gyan. You are correct, it is as straight forward as it appears.

WRT the drafts merged to create the CSID draft, the “I-D.*” links in the doc point to the references section of the doc, and ultimately the links that you referenced.

https://datatracker.ietf.org/doc/html/draft-filsfils-spring-net-pgm-extension-srv6-usid-10
https://datatracker.ietf.org/doc/html/draft-cl-spring-generalized-srv6-for-cmpr-03

Darren

________________________________
From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Monday, July 26, 2021 7:51 PM
To: Darren Dukes (ddukes)
Cc: SPRING WG
Subject: Re: [spring] SRv6 SID List compression


Dear DT,

Excellent work and many thanks to  the design team to come provide the detailed analysis of the 4 proposals and how they match up with the requirements.

>From the analysis it does sound like CSID is the choice by the DT.

SRv6 compression & MSD issue is now finally solved!  Excellent news!!

Now it’s just a matter of moving forward with CSID Adoption poll.

>From the analysis it does not seem there is any draft that is in close 2nd place or a close call.

>From the analysis draft the two drafts that are combined to create CSID -> I don’t see it on the Spring WG Datatracker?

https://datatracker.ietf.org/doc/html/draft-srcompdt-spring-compression-analysis-02


The following mechanisms are proposed to compress the SRv6 SID list:



   o  CSID - [I-D.filsfilscheng-spring-srv6-srh-comp-sl-enc<https://datatracker.ietf.org/doc/html/draft-srcompdt-spring-compression-analysis-02#ref-I-D.filsfilscheng-spring-srv6-srh-comp-sl-enc>] - Describes

      two new SRv6 SID flavors, a combination of SID flavors from

      [I-D.filsfils-spring-net-pgm-extension-srv6-usid<https://datatracker.ietf.org/doc/html/draft-srcompdt-spring-compression-analysis-02#ref-I-D.filsfils-spring-net-pgm-extension-srv6-usid>] and

      [I-D.cl-spring-generalized-srv6-for-cmpr<https://datatracker.ietf.org/doc/html/draft-srcompdt-spring-compression-analysis-02#ref-I-D.cl-spring-generalized-srv6-for-cmpr>]

   o  CRH - [I-D.bonica-6man-comp-rtg-hdr<https://datatracker.ietf.org/doc/html/draft-srcompdt-spring-compression-analysis-02#ref-I-D.bonica-6man-comp-rtg-hdr>] - Requires two new routing

      header types and a label mapping technique.

   o  VSID - [I-D.decraene-spring-srv6-vlsid<https://datatracker.ietf.org/doc/html/draft-srcompdt-spring-compression-analysis-02#ref-I-D.decraene-spring-srv6-vlsid>] - Defines a set of SID

      behaviors to access smaller SIDs within the SR header.

   o  UIDSR - [I-D.mirsky-6man-unified-id-sr<https://datatracker.ietf.org/doc/html/draft-srcompdt-spring-compression-analysis-02#ref-I-D.mirsky-6man-unified-id-sr>] - Extends the SRH to carry

      MPLS labels or IPv6 addresses.


Below 2 drafts are combined to create CSID??

https://datatracker.ietf.org/doc/html/draft-filsfils-spring-net-pgm-extension-srv6-usid-10


https://datatracker.ietf.org/doc/html/draft-cl-spring-generalized-srv6-for-cmpr-03


Kind Regards

Gyan

On Mon, Jul 26, 2021 at 5:53 PM Darren Dukes (ddukes) <ddukes=40cisco.com@dmarc.ietf.org<mailto:40cisco.com@dmarc.ietf.org>> wrote:
I’ll paraphrase what I said in the call...

Today the design team presented analysis of proposals to compress an SRv6 SID list.
They spent a year building the requirements and completing the analysis, in depth, with unanimous consensus.
The CSID proposal satisfied all the requirements to the largest degree of any proposal.
That proposal has multiple implementations, and interoperability, noted in the draft.
That proposal has a large set of SPRING participants working on it already.

The problem of SRv6 SID list compression is solved, CSID is ready for adoption.

I hope we can conclude this, and choose a single proposal for WG adoption.

Darren




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Gyan Mishra

Network Solutions Architect

Email gyan.s.mishra@verizon.com<mailto:gyan.s.mishra@verizon.com>

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