Re: G-SRv6 (was Re: Adoption Call for "The IPv6 Compact Routing Header (CRH)")
Tom Herbert <tom@herbertland.com> Tue, 26 May 2020 14:00 UTC
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From: Tom Herbert <tom@herbertland.com>
Date: Tue, 26 May 2020 07:00:41 -0700
Message-ID: <CALx6S35iv6SYDfz=i73nzstTf=t87_j=04tgym+VdzqV1UOF2A@mail.gmail.com>
Subject: Re: G-SRv6 (was Re: Adoption Call for "The IPv6 Compact Routing Header (CRH)")
To: Huzhibo <huzhibo@huawei.com>
Cc: Bob Hinden <bob.hinden@gmail.com>, IPv6 List <ipv6@ietf.org>
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On Mon, May 25, 2020, 7:41 PM Huzhibo <huzhibo@huawei.com> wrote: > Hi Tom, > > With respect to that draft I have a few questions: > > 1. Doesn't G-SRv6 require a different routing type? I don't see how > G-SRv6 compatible could be compatible with RFC8754 which clearly > defines SIDs to be 128 bits. > [Zhibo] No, we don't require a different routing type, because we don't > modify the format of SRH. Segment Left points to a 128 bit SID, and it may > contain multiple G-SIDs. The appearance of G-SID is indicated by COC Flavor. > Zhibo, Thanks for the clarification, but it's still not clear to me exactly how this works. Can you provide an example of what a SRH with G-SIDs looks like? For instance, suppose there are one or two SIDs that can be compressed to 16 bits-- this could be sent in an 8 byte CRH (4 bytes for header and 4 bytes for two SIDs 2*2). Similarly, in a 16 byte CRH we can encode 3, 4, 5, or 6 16 bit SIDs. Can you describe the analogous format and header sizes for these scenarios in G-SRv6? Also, how does segments left work if it only points to a 128 bit SID that SID may itself be composed of multiple G-SIDs? > > 2. Where would the work for G-SRv6 be done? Since work for SRH was > done in 6man, I tend to think G-SRv6 should also be in 6man. > [Zhibo] Well, we think the architecture should be done in SPRING, because > we need to define a new flavor of SIDs. Regarding the dataplane extension, > it should be done in 6man. > > 3. Given that Flags, Tag, and TLVs are not critical and unused in the > common case, and with no TLVs Last Entry is unnecessary, can't these > fields simply be omitted in the compressed format to reduce overhead? > > [Zhibo] Of cause you can do that. Like CRH. But we think Flags, Tag and > TLVs are important since it provides flexibilities and programmability. We > can use these fields to support many per-path of per-segment use cases. The > value of them worth to get 32 bits. > > When considering overhead reducing, it is VERY IMPORTANT to not sacrifice > features. > > Reducing overhead by deleting features seems not clever. > It's not so much removing features as it is compressing out fields that are not commonly used. I suspect the vast majority of SRH implementations send zeros in these fields which make them a good candidate for compression. Tom > > > RH was defined in 6man. > > Thanks > Zhibo Hu > > -----Original Message----- > From: Tom Herbert [mailto:tom@herbertland.com] > Sent: Monday, May 25, 2020 10:35 PM > To: Huzhibo <huzhibo@huawei.com> > Cc: Bob Hinden <bob.hinden@gmail.com>; IPv6 List <ipv6@ietf.org> > Subject: G-SRv6 (was Re: Adoption Call for "The IPv6 Compact Routing > Header (CRH)") > > On Mon, May 25, 2020 at 7:09 AM Huzhibo <huzhibo@huawei.com> wrote: > > > > Hi 6man, > > I do not support the adoption. > > > > > > I don't know what is the requirement of the CRH. If CRH is used for > > steering SR-MPLS traffic over IP network, then RFC8663 has provided a > > really good solution. If CRH is aiming to address the overhead problem > > of SRv6, then it is recommended to define a mechanism under SRv6 > > framework, instead of inventing a huge set of control plane and data > > plane solutions. Also, we think G-SRv6 for compression has solved the > > overhead problem of SRv6.[1] > > > > Best regards, > > Zhibo Hu > > > > [1]https://tools.ietf.org/html/draft-cl-spring-generalized-srv6-for-cm > > pr-01 > > > Hi Zhibo, > > With respect to that draft I have a few questions: > > 1. Doesn't G-SRv6 require a different routing type? I don't see how > G-SRv6 compatible could be compatible with RFC8754 which clearly defines > SIDs to be 128 bits. > 2. Where would the work for G-SRv6 be done? Since work for SRH was done in > 6man, I tend to think G-SRv6 should also be in 6man. > 3. Given that Flags, Tag, and TLVs are not critical and unused in the > common case, and with no TLVs Last Entry is unnecessary, can't these fields > simply be omitted in the compressed format to reduce overhead? > > Tom > > > -----Original Message----- > > From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Bob Hinden > > Sent: Saturday, May 16, 2020 6:14 AM > > To: IPv6 List <ipv6@ietf.org> > > Cc: Bob Hinden <bob.hinden@gmail.com> > > Subject: Adoption Call for "The IPv6 Compact Routing Header (CRH)" > > > > This message starts a two-week 6MAN call on adopting: > > > > Title: The IPv6 Compact Routing Header (CRH) > > Authors: R. Bonica, Y. Kamite, T. Niwa, A. Alston, L. Jalil > > File Name: draft-bonica-6man-comp-rtg-hdr-21 > > Document date: 2020-05-14 > > > > https://tools.ietf.org/html/draft-bonica-6man-comp-rtg-hdr > > > > as a working group item. Substantive comments regarding adopting this > document should be directed to the mailing list. Editorial suggestions can > be sent to the authors. > > > > Please note that this is an adoption call, it is not a w.g. last call > for advancement, adoption means that it will become a w.g. draft. As the > working group document, the w.g. will decide how the document should change > going forward. > > > > This adoption call will end on 29 May 2020. > > > > The chairs note there has been a lot of discussions on the list about > this draft. After discussing with our area directors, we think it is > appropriate to start a working group adoption call. The authors have been > active in resolving issues raised on the list. > > > > Could those who are willing to work on this document, either as > contributors, authors or reviewers please notify the list. That gives us > an indication of the energy level in the working group > > to work on this. > > > > Regards, > > Bob and Ole > > > > > > -------------------------------------------------------------------- > > IETF IPv6 working group mailing list > > ipv6@ietf.org > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > -------------------------------------------------------------------- >
- RE: Adoption Call for "The IPv6 Compact Routing H… Ketan Talaulikar (ketant)
- Re: Adoption Call for "The IPv6 Compact Routing H… Brian E Carpenter
- RE: Adoption Call for "The IPv6 Compact Routing H… Ketan Talaulikar (ketant)
- RE: Adoption Call for "The IPv6 Compact Routing H… Ketan Talaulikar (ketant)
- Re: Adoption Call for "The IPv6 Compact Routing H… Xing Li
- Adoption Call for "The IPv6 Compact Routing Heade… Bob Hinden
- Re: Adoption Call for "The IPv6 Compact Routing H… Mark Smith
- Re: Adoption Call for "The IPv6 Compact Routing H… Andrew Alston
- Re: Adoption Call for "The IPv6 Compact Routing H… Joel M. Halpern
- RE: Adoption Call for "The IPv6 Compact Routing H… Ron Bonica
- Re: Adoption Call for "The IPv6 Compact Routing H… Xing Li
- Re: Adoption Call for "The IPv6 Compact Routing H… Tom Herbert
- Re: Adoption Call for "The IPv6 Compact Routing H… Brian E Carpenter
- RE: Adoption Call for "The IPv6 Compact Routing H… Xiejingrong (Jingrong)
- Re: Adoption Call for "The IPv6 Compact Routing H… Mark Smith
- RE: Adoption Call for "The IPv6 Compact Routing H… Ron Bonica
- Re: Adoption Call for "The IPv6 Compact Routing H… Krzysztof Szarkowicz
- Re: Adoption Call for "The IPv6 Compact Routing H… Melchior Aelmans
- RE: Adoption Call for "The IPv6 Compact Routing H… Xiejingrong (Jingrong)
- RE: Adoption Call for "The IPv6 Compact Routing H… Xiejingrong (Jingrong)
- Re: Adoption Call for "The IPv6 Compact Routing H… Nick Hilliard
- RE: Adoption Call for "The IPv6 Compact Routing H… Jeffrey (Zhaohui) Zhang
- Re: Adoption Call for "The IPv6 Compact Routing H… Darren Dukes (ddukes)
- Re: Adoption Call for "The IPv6 Compact Routing H… Andrew Alston
- Re: Adoption Call for "The IPv6 Compact Routing H… Tony Przygienda
- RE: Adoption Call for "The IPv6 Compact Routing H… Vishal Singh
- Re: Adoption Call for "The IPv6 Compact Routing H… John Scudder
- Re: Adoption Call for "The IPv6 Compact Routing H… Greg Mirsky
- Re: Adoption Call for "The IPv6 Compact Routing H… Greg Mirsky
- Re: Adoption Call for "The IPv6 Compact Routing H… Gyan Mishra
- Re: Adoption Call for "The IPv6 Compact Routing H… Mark Smith
- Re: Adoption Call for "The IPv6 Compact Routing H… Brian E Carpenter
- Re: Adoption Call for "The IPv6 Compact Routing H… Michael Richardson
- RE: Adoption Call for "The IPv6 Compact Routing H… Ron Bonica
- Re: Adoption Call for "The IPv6 Compact Routing H… Greg Mirsky
- Re: Adoption Call for "The IPv6 Compact Routing H… Darren Dukes (ddukes)
- Re: Adoption Call for "The IPv6 Compact Routing H… Andrew Alston
- RE: Adoption Call for "The IPv6 Compact Routing H… Pascal Thubert (pthubert)
- Re: Adoption Call for "The IPv6 Compact Routing H… Wen Lin
- Re: Adoption Call for "The IPv6 Compact Routing H… Darren Dukes (ddukes)
- RE: Adoption Call for "The IPv6 Compact Routing H… Ketan Talaulikar (ketant)
- FW: Adoption Call for "The IPv6 Compact Routing H… Ketan Talaulikar (ketant)
- Re: Adoption Call for "The IPv6 Compact Routing H… Zafar Ali (zali)
- Re: Adoption Call for "The IPv6 Compact Routing H… Naveen Kottapalli
- Re: Adoption Call for "The IPv6 Compact Routing H… John Scudder
- Re: Adoption Call for "The IPv6 Compact Routing H… Brian E Carpenter
- RE: Adoption Call for "The IPv6 Compact Routing H… Pablo Camarillo (pcamaril)
- RE: Adoption Call for "The IPv6 Compact Routing H… Andrew Alston
- Re: Adoption Call for "The IPv6 Compact Routing H… Eric Vyncke (evyncke)
- Re: Adoption Call for "The IPv6 Compact Routing H… John Scudder
- RE: Adoption Call for "The IPv6 Compact Routing H… Parag Kaneriya
- RE: Adoption Call for "The IPv6 Compact Routing H… Ketan Talaulikar (ketant)
- Reply: Re: Adoption Call for "The IPv6 Compact Ro… Chengli (Cheng Li)
- Re: Adoption Call for "The IPv6 Compact Routing H… John Scudder
- RE: Reply: Re: Adoption Call for "The IPv6 Compac… Ron Bonica
- 答复: Adoption Call for "The IPv6 Compact Routing H… Weiqiang Cheng
- RE: Adoption Call for "The IPv6 Compact Routing H… Huzhibo
- G-SRv6 (was Re: Adoption Call for "The IPv6 Compa… Tom Herbert
- RE: G-SRv6 (was Re: Adoption Call for "The IPv6 C… Huzhibo
- Re: Adoption Call for "The IPv6 Compact Routing H… 刘毅松
- 回复: Re: Adoption Call for "The IPv6 Compact Routi… duzongpeng@foxmail.com
- Re: Adoption Call for "The IPv6 Compact Routing H… Srihari Sangli
- 回复: 回复: Adoption Call for "The IPv6 Compact Routi… Peng Liu
- Re: Adoption Call for "The IPv6 Compact Routing H… stefano previdi
- Re: G-SRv6 (was Re: Adoption Call for "The IPv6 C… Tom Herbert
- Re: Adoption Call for "The IPv6 Compact Routing H… Henderickx, Wim (Nokia - BE/Antwerp)
- RE: Adoption Call for "The IPv6 Compact Routing H… Ron Bonica
- Re: Adoption Call for "The IPv6 Compact Routing H… Ahmed Abdelsalam
- Re: Adoption Call for "The IPv6 Compact Routing H… stefano previdi
- Re: Adoption Call for "The IPv6 Compact Routing H… Greg Mirsky
- Re: Adoption Call for "The IPv6 Compact Routing H… Gyan Mishra
- RE: Adoption Call for "The IPv6 Compact Routing H… Mach Chen
- RE: Adoption Call for "The IPv6 Compact Routing H… Ron Bonica
- Re: Adoption Call for "The IPv6 Compact Routing H… Henderickx, Wim (Nokia - BE/Antwerp)
- Re: Adoption Call for "The IPv6 Compact Routing H… Henderickx, Wim (Nokia - BE/Antwerp)
- Re: Adoption Call for "The IPv6 Compact Routing H… Gyan Mishra
- RE: Adoption Call for "The IPv6 Compact Routing H… Mach Chen
- Re: Adoption Call for "The IPv6 Compact Routing H… Gyan Mishra
- RE: Adoption Call for "The IPv6 Compact Routing H… Mach Chen
- Re: Adoption Call for "The IPv6 Compact Routing H… Henderickx, Wim (Nokia - BE/Antwerp)
- Re: Adoption Call for "The IPv6 Compact Routing H… xiechf@chinatelecom.cn
- RE: Adoption Call for "The IPv6 Compact Routing H… Dongjie (Jimmy)
- Re: Adoption Call for "The IPv6 Compact Routing H… Reji Thomas
- Re: Adoption Call for "The IPv6 Compact Routing H… Robert Raszuk
- Re: Adoption Call for "The IPv6 Compact Routing H… Antonio Cianfrani
- Re: Adoption Call for "The IPv6 Compact Routing H… Robert Raszuk
- Re: Adoption Call for "The IPv6 Compact Routing H… Rabadan, Jorge (Nokia - US/Mountain View)
- RE: Adoption Call for "The IPv6 Compact Routing H… Van De Velde, Gunter (Nokia - BE/Antwerp)
- RE: Adoption Call for "The IPv6 Compact Routing H… Xiejingrong (Jingrong)
- Re: Adoption Call for "The IPv6 Compact Routing H… Srihari Sangli
- RE: Adoption Call for "The IPv6 Compact Routing H… Ron Bonica
- RE: Adoption Call for "The IPv6 Compact Routing H… Templin (US), Fred L
- Re: Adoption Call for "The IPv6 Compact Routing H… Henderickx, Wim (Nokia - BE/Antwerp)
- Re: Adoption Call for "The IPv6 Compact Routing H… Greg Mirsky
- Re: Adoption Call for "The IPv6 Compact Routing H… Greg Mirsky
- Re: Adoption Call for "The IPv6 Compact Routing H… Tom Herbert
- Re: Adoption Call for "The IPv6 Compact Routing H… Greg Mirsky
- Re: Adoption Call for "The IPv6 Compact Routing H… Tom Herbert
- Re: Adoption Call for "The IPv6 Compact Routing H… Darren Dukes (ddukes)
- Re: Adoption Call for "The IPv6 Compact Routing H… Martin Horneffer
- Re: Adoption Call for "The IPv6 Compact Routing H… Greg Mirsky
- Re: Adoption Call for "The IPv6 Compact Routing H… Tetsuya Murakami
- Re: Adoption Call for "The IPv6 Compact Routing H… Kalyani Rajaraman
- RE: Adoption Call for "The IPv6 Compact Routing H… Michael McBride
- Re: Adoption Call for "The IPv6 Compact Routing H… Tom Herbert
- Re: Adoption Call for "The IPv6 Compact Routing H… Ran Pang(联通集团联通网络技术研究 院本部)
- Re: Adoption Call for "The IPv6 Compact Routing H… Miya Kohno
- Re: Adoption Call for "The IPv6 Compact Routing H… Kentaro Ebisawa
- RE: Adoption Call for "The IPv6 Compact Routing H… licong@chinatelecom.cn
- Re: Adoption Call for "The IPv6 Compact Routing H… Fernando Gont
- 答复: Adoption Call for "The IPv6 Compact Routing H… qinfengwei
- RE: Adoption Call for "The IPv6 Compact Routing H… Ketan Talaulikar (ketant)
- Re: Adoption Call for "The IPv6 Compact Routing H… Satoru Matsushima
- RE: Adoption Call for "The IPv6 Compact Routing H… Voyer, Daniel
- Re: Adoption Call for "The IPv6 Compact Routing H… Miya Kohno
- Re: Adoption Call for "The IPv6 Compact Routing H… Joel M. Halpern
- Re: Adoption Call for "The IPv6 Compact Routing H… Tom Herbert
- Re: Adoption Call for "The IPv6 Compact Routing H… Greg Mirsky
- RE: Adoption Call for "The IPv6 Compact Routing H… Templin (US), Fred L
- Re: Adoption Call for "The IPv6 Compact Routing H… Tom Herbert
- Re: Adoption Call for "The IPv6 Compact Routing H… Greg Mirsky
- Re: Adoption Call for "The IPv6 Compact Routing H… Tom Herbert
- Re: Adoption Call for "The IPv6 Compact Routing H… Kamran Raza (skraza)
- Re: Adoption Call for "The IPv6 Compact Routing H… Fernando Gont
- Re: Adoption Call for "The IPv6 Compact Routing H… Jakob Heitz (jheitz)
- RE: Adoption Call for "The IPv6 Compact Routing H… Wang, Weibin (NSB - CN/Shanghai)
- Re: Re: Adoption Call for "The IPv6 Compact Routi… 이기훈/책임
- Re: Adoption Call for "The IPv6 Compact Routing H… Swadesh Agrawal (swaagraw)
- Re: Adoption Call for "The IPv6 Compact Routing H… Gyan Mishra
- RE: Re: Adoption Call for "The IPv6 Compact Routi… Chengli (Cheng Li)
- RE: Adoption Call for "The IPv6 Compact Routing H… Chengli (Cheng Li)
- Re: Re: Adoption Call for "The IPv6 Compact Routi… Rakesh Gandhi
- Re: [spring] FW: Adoption Call for "The IPv6 Comp… Dirk Steinberg
- comments on draft-bonica-6man-comp-rtg-hdr (Re: A… 神明達哉
- Re: Adoption Call for "The IPv6 Compact Routing H… Francois Clad (fclad)
- Compatibility with SRH requirement (was Re: Adopt… Tom Herbert
- Conclusion of the Adoption Call for "The IPv6 Com… Bob Hinden
- Re: Adoption Call for "The IPv6 Compact Routing H… Zafar Ali (zali)
- RE: Compatibility with SRH requirement (was Re: A… James Guichard
- Re: Compatibility with SRH requirement (was Re: A… Greg Mirsky
- Re: Compatibility with SRH requirement (was Re: A… Tom Herbert
- RE: Compatibility with SRH requirement (was Re: A… James Guichard
- Re: Adoption Call for "The IPv6 Compact Routing H… Richard Vallee (rvallee)
- Re: Adoption Call for "The IPv6 Compact Routing H… Kris Michielsen
- Re: Compatibility with SRH requirement (was Re: A… Tom Herbert
- Re: Compatibility with SRH requirement (was Re: A… Robert Raszuk
- RE: Compatibility with SRH requirement (was Re: A… James Guichard
- Re: Compatibility with SRH requirement (was Re: A… Tom Herbert
- RE: Compatibility with SRH requirement (was Re: A… James Guichard
- Re: Compatibility with SRH requirement (was Re: A… John Scudder
- Re: Compatibility with SRH requirement (was Re: A… Nick Hilliard
- RE: Compatibility with SRH requirement (was Re: A… James Guichard
- RE: Compatibility with SRH requirement (was Re: A… Adrian Farrel
- RE: Compatibility with SRH requirement (was Re: A… James Guichard
- Re: Compatibility with SRH requirement (was Re: A… Tom Herbert
- Re: Adoption Call for "The IPv6 Compact Routing H… Jen Linkova
- Re: Conclusion of the Adoption Call for "The IPv6… Erik Kline
- Followup Conclusion of the Adoption Call for "The… Bob Hinden