Re: [spring] Fw:New Version Notification for draft-srcompdt-spring-compression-requirement-01.txt

Dirk Steinberg <dirk@lapishills.com> Thu, 19 November 2020 15:47 UTC

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From: Dirk Steinberg <dirk@lapishills.com>
Date: Thu, 19 Nov 2020 17:46:50 +0200
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Subject: Re: [spring] Fw:New Version Notification for draft-srcompdt-spring-compression-requirement-01.txt
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Hello SPRING WG,

I have read the SRComp design team requirements draft
and would like to comment.

I truly believe that a SID compression scheme MUST integrate into the
existing SRv6 framework. Otherwise it does not make much sense,
or said another way, it will not be a SID compression scheme for SRv6
at all but another animal altogether.

SID compression should be used where the use case justifies it, i.e.
strict path TE inside a given domain. Inter-Domain usage of SRv6,
especially end systems in data centers, may have different requirements
and thus decide to use uncompressed SRv6 SIDs. It is important that
a SID list that describes a service that spans across multiple domains
be able to contain both compressed and uncompressed SIDs.
Consequently, the same CP needs to support both compressed and
uncompressed SIDs.

I am currently working on an architecture based on SRv6 for different
domains within a carrier network. These domains have different
requirements and also different hardware capabilities that may lead
to different designs for each subnetwork. But all these domains/
subnetworks must be able to interoperate seamlessly based on SRv6
standards, regardless of whether SID compression is used or not.

Therefore I strongly agree that Appendix A should be part of the draft.

I would also like to suggest another requirement:
IMHO the single biggest advantage that SRv6 has compared to
MPLS is aggregation (route summarization), something that is
absolutely not possible with MPLS labels (SIDs).
Aggregation (CIDR) is the very technology that has enabled the Internet
to scale and to become the worldwide internetwork that it is today.
In retrospect I believe the omission of aggregation has been the
biggest design mistake in MPLS -- but back then there were a lot
of other factors and the idea to use a very short tag for forwarding.
After all Tag Switching and MPLS were inspired from ATM
and within this context aggregation made no sense.

Consequently I propose to add to the draft the requirement that the
SID compression scheme MUST be compatible with aggregation,
i.e. it must be possible to express the reachability of a given set of
SIDs (maybe in some domain or data center) using a summary prefix.

Thanks and Cheers
Dirk






On Thu, Nov 19, 2020 at 3:21 PM Ahmed Bashand <abashandy.ietf@gmail.com>
wrote:

> I also agree that the requirements in Appendix A should be part of the
> draft. Having of existing standard as a basis greatly simplifies the
> development and deployment of any compression scheme
>
>
> Thanks
>
>
> Ahmed
>
>
>
> On 11/19/20 12:58 AM, Ran Pang(联通集团中国联通研究院-本部) wrote:
>
> Hi Weiqiang and WG,
>     I read the draft and agree with the requirements specified in it.I
> think the requirements in Appendix A should be part of the draft in the
> next version.
>     China Unicom is working on a network evolution plan for SRv6 now,  and
> we have done some field trials based on SRv6. In order to maintain the
> continuity of  the functionality, we suggest the solution based on the SRv6
> standards.
>
> Best regards,
> Pang Ran
>
>
> *From:* 程伟强 <chengweiqiang@chinamobile.com>
> *Date:* 2020-11-15 23:27
> *To:* spring <spring@ietf.org>
> *CC:* srcomp <srcomp@ietf.org>rg>; spring-chairs@ietf.o
> <spring-chairs@ietf.org>
> *Subject:* [spring] Fw:New Version Notification for
> draft-srcompdt-spring-compression-requirement-01.txt
>
> Hi Group,
>
> SR compression design team have submitted a new version of compression
> requirement draft.
>
> Main changes as follows:
>
> - added 3 items about scalibility with agreement within the design team
>
> - added an appendix including 3 items without without unanimous consensus
> within the design team
>
> - some minor text issue fixed
>
> Please review it and let us know your comments.
>
>
> BTW: We will have 1-hour session for the design team topic on Friday and
> welcome to join us.
>
>
> B.R.
>
> Weiqiang on behalf of design team
>
>
>
>
> ----邮件原文----
> 发件人:internet-drafts <internet-drafts@ietf.org> <internet-drafts@ietf.org>
> 收件人:Weiqiang Cheng <chengweiqiang@chinamobile.com>
> <chengweiqiang@chinamobile.com>,Sander Steffann <sander@steffann.nl>
> <sander@steffann.nl>,SJM Steffann <sander@steffann.nl>
> <sander@steffann.nl>
> 抄 送: (无)
> 发送时间:2020-11-15 22:58:57
>
> 主题:New Version Notification for draft-srcompdt-spring-compression-requirement-01.txt
>
>
> A new version of I-D, draft-srcompdt-spring-compression-requirement-01.txt
> has been successfully submitted by Weiqiang Cheng and posted to the
> IETF repository.
>
> Name: draft-srcompdt-spring-compression-requirement
> Revision: 01
> Title: Compressed SRv6 SID List Requirements
> Document date: 2020-11-13
> Group: Individual Submission
> Pages: 13
> URL:
> https://www.ietf.org/archive/id/draft-srcompdt-spring-compression-requirement-01.txt
> Status:
> https://datatracker.ietf.org/doc/draft-srcompdt-spring-compression-requirement/
> Htmlized:
> https://datatracker.ietf.org/doc/html/draft-srcompdt-spring-compression-requirement
> Htmlized:
> https://tools.ietf.org/html/draft-srcompdt-spring-compression-requirement-01
> Diff:
> https://www.ietf.org/rfcdiff?url2=draft-srcompdt-spring-compression-requirement-01
>
> Abstract:
>  This document specifies requirements for solutions to compress SRv6
>  SID lists.
>
>
>
>
>
> 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
>
>
>
>
> Subject:New Version Notification for draft-srcompdt-spring-compression-requirement-01.txt
>
>
> A new version of I-D, draft-srcompdt-spring-compression-requirement-01.txt
> has been successfully submitted by Weiqiang Cheng and posted to the
> IETF repository.
>
> Name: draft-srcompdt-spring-compression-requirement
> Revision: 01
> Title: Compressed SRv6 SID List Requirements
> Document date: 2020-11-13
> Group: Individual Submission
> Pages: 13
> URL:
> https://www.ietf.org/archive/id/draft-srcompdt-spring-compression-requirement-01.txt
> Status:
> https://datatracker.ietf.org/doc/draft-srcompdt-spring-compression-requirement/
> Htmlized:
> https://datatracker.ietf.org/doc/html/draft-srcompdt-spring-compression-requirement
> Htmlized:
> https://tools.ietf.org/html/draft-srcompdt-spring-compression-requirement-01
> Diff:
> https://www.ietf.org/rfcdiff?url2=draft-srcompdt-spring-compression-requirement-01
>
> Abstract:
>  This document specifies requirements for solutions to compress SRv6
>  SID lists.
>
>
>
>
>
> 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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