Re: [spring] Beyond SRv6.
Robert Raszuk <robert@raszuk.net> Tue, 03 September 2019 12:13 UTC
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From: Robert Raszuk <robert@raszuk.net>
Date: Tue, 03 Sep 2019 14:12:49 +0200
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To: Shraddha Hegde <shraddha=40juniper.net@dmarc.ietf.org>
Cc: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>, "6man@ietf.org" <6man@ietf.org>
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Subject: Re: [spring] Beyond SRv6.
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Hi Shraddha, The proposed architecture in CRH based drafts is a significant departure from Segment Routing Architecture as standardized in IETF. The compression advantages the set of drafts propose are all based on the mapping of 16 or 32 bit bitstrings to IPv6 addresses and their flooding in IGPs and BGP via proposed extensions. Such mapping is not part of SR Architecture. As you know I personally have no objections to support any control plane solution. Specifically if you would honestly admit that proposed architecture is not in line with Segment Routing Architecture as described in RFC8402, but solves some customer needs I am sure the acceptance barrier could be much different. Taking your scheme - please kindly explain how can you provide the notion of Global Adj SIDs ref section 3.4 of RFC 8402 ? With your scheme to operate IPv6 to SID mapping must be flooded in IGP domain wide so even if nodes do not need to participate in any IPv6 Segment Routing they will need to store in their control plane such additional state. Without mapping such additional state in SRv6 operation by non SR nodes is optional - meaning that SRv6 can operate just fine without any IGP extensions required. Quote from "draft-ietf-lsr-isis-srv6-extensions-02": Segment Routing can be directly instantiated on the IPv6 data plane through the use of the Segment Routing Header defined in [I-D.ietf-6man-segment-routing-header]. Can you kindly explain how SRv6+ proposal can be directly instantiated on the IPv6 data plane without any protocol extensions ? Kind regards, Robert On Tue, Sep 3, 2019 at 12:44 PM Shraddha Hegde <shraddha= 40juniper.net@dmarc.ietf.org> wrote: > SPRING WG, > > > > SRv6+ is definitely a better proposal in terms > > 1.Adherence to IPv6 Architecture > > 2.Efficient encoding > > 3.Operational simplicity > > > > There hasn't been a single mail denying the above advantages of SRv6+ > > The only argument has been the SRv6 in its present form has been > > deployed by a couple of operators and a handful interested in it. > > > > u-sid tries to solve point 2 above but the addressing architecture > > isn't very clear. Deploying this solution in a running network > > hasn't been explained. > > > > There is clearly interest in the operator community for a better > solution and > > I support SPRING WG to continue work on SRv6+. > > > > > > Rgds > > Shraddha > > > > *From:* spring <spring-bounces@ietf.org> *On Behalf Of *Ron Bonica > *Sent:* Monday, September 2, 2019 6:53 PM > *To:* Rob Shakir <robjs=40google.com@dmarc.ietf.org>; SPRING WG List < > spring@ietf.org>; 6man@ietf.org > *Subject:* Re: [spring] Beyond SRv6. > > > > Rob, > > > > There may be an elephant in the room that needs addressing…. > > > > Over the years, the IPv6 community has specified a very tight architecture > that encodes some information in IPv6 addresses, other information in > Routing headers, and still other information in Destination Options > headers. SRv6+ adheres strictly to this architecture. Because it reuses > IPv6 machinery, its specification promises it be painless and its > deployment promises to be safe. To date, there has been no significant > technical criticism of SRv6+. Only a claim that SRv6 is nearly complete and > good enough. (Both of those claims may require scrutiny). > > > > By contrast, SRv6 varies from the spirit, if not the letter of the IPv6 > architecture. It encodes things in IPv6 address that have never been > encoded in IPv6 addresses before. It attempts to encode everything else in > the Routing header, as if the other IPv6 extension headers didn’t exist. It > frequently tests the limits of RFC 8200 compliance. > > > > This creates a situation in which each variance from IPv6 orthodoxy > requires another. For example, because SRv6 encodes instructions in IPv6 > addresses, draft-ali-6man-spring-srv6-oam is required. And now, > draft-ali-6man-spring-srv6-oam creates its own variances from the IPv6 > orthodoxy. OAM information is encoded in the Routing header and the Routing > header must be examined, even when Segment Left is equal to zero. > > > > I invite everyone to consider how TI-LFA an uSID will interact. > > > > So, why would the IETF would want to prevent work on the more > conservative, SRv6+ approach? This brings us to the back to the elephant > in the room….. > > > > Until very recently, relatively few router vendors have supported IPv6 > extension headers in ASICs. If an IPv6 packet contained any extension > headers at all, it was sent to the slow path. > > > > SRv6+ encourages router vendors to support both the Routing and > Destination Options header in ASICs. This sets vendors on a path on a path > towards more complete implementation of the architecture that the IPv6 > community has developed so carefully over the years. It encourages vendors > to commit more and more of RFC 8200 to ASICs. > > > > SRv6 encourages router vendors to support the Routing header in ASICs, > while doing everything possible to mitigate the need to support Destination > Options in ASICs. This may be a necessary expedient for many platforms. > However, it should not be the only approach, or even the long-term approach > for the IETF. > > > > > Ron > > > > > > > > > > *From:* spring <spring-bounces@ietf.org> *On Behalf Of *Rob Shakir > *Sent:* Sunday, August 4, 2019 5:04 PM > *To:* SPRING WG List <spring@ietf.org> > *Subject:* [spring] Beyond SRv6. > > > > Hi SPRING WG, > > > > Over the last 5+ years, the IETF has developed Source Packet Routing in > NetworkinG (SPRING) aka Segment Routing for both the MPLS (SR-MPLS) and > IPv6 (SRv6) data planes. SR-MPLS may also be transported over IP in UDP or > GRE. > > > > These encapsulations are past WG last call (in IESG or RFC Editor). > > > > During the SPRING WG meeting at IETF 105, two presentations were related > to the reduction of the size of the SID for IPv6 dataplane: > > - SRv6+ / CRH -- > https://tools.ietf.org/html/draft-bonica-spring-srv6-plus-04 > <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dbonica-2Dspring-2Dsrv6-2Dplus-2D04&d=DwMFaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=Fch9FQ82sir-BoLx84hKuKwl-AWF2EfpHcAwrDThKP8&m=ackZC9evRf_LWYu2a-1NaGRDJKdxnE2ieIC4dD_FL6s&s=KUhAfjVsx_wK645uJk0FHzs2vxiAVr-CskMPAaEhEQQ&e=> > - uSID -- > https://tools.ietf.org/html/draft-filsfils-spring-net-pgm-extension-srv6-usid-01 > <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dfilsfils-2Dspring-2Dnet-2Dpgm-2Dextension-2Dsrv6-2Dusid-2D01&d=DwMFaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=Fch9FQ82sir-BoLx84hKuKwl-AWF2EfpHcAwrDThKP8&m=ackZC9evRf_LWYu2a-1NaGRDJKdxnE2ieIC4dD_FL6s&s=Aq1DK7fu73axZ1PXLIE8xnHE2AhTtNZy9LTHgWqx4CQ&e=> > > > > > During the IETF week, two additional drafts have been proposed: > > - https://tools.ietf.org/html/draft-li-spring-compressed-srv6-np-00 > <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dli-2Dspring-2Dcompressed-2Dsrv6-2Dnp-2D00&d=DwMFaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=Fch9FQ82sir-BoLx84hKuKwl-AWF2EfpHcAwrDThKP8&m=ackZC9evRf_LWYu2a-1NaGRDJKdxnE2ieIC4dD_FL6s&s=XWUDAD2FMhWLfeT5sgUb1lgthJhugcyT98GJ2N-CrKs&e=> > > - https://tools.ietf.org/html/draft-mirsky-6man-unified-id-sr-03 > <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dmirsky-2D6man-2Dunified-2Did-2Dsr-2D03&d=DwMFaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=Fch9FQ82sir-BoLx84hKuKwl-AWF2EfpHcAwrDThKP8&m=ackZC9evRf_LWYu2a-1NaGRDJKdxnE2ieIC4dD_FL6s&s=gcbkHYxXm7FU7vblOB1vI58SDaaWf62pa7YvLmsP4nI&e=> > > > > > As we expressed during the meeting, it is important for the WG to > understand what the aims of additional encapsulations are. Thus, we think > it is important that the WG should first get to a common understanding on > the requirements for a new IPv6 data plane with a smaller SID - both from > the perspective of operators that are looking to deploy these technologies, > and from that of the software/hardware implementation. > > > > Therefore, we would like to solicit network operators interested in SR > over the IPv6 data plane to briefly introduce their: > > - use case (e.g. Fast Reroute, explicit routing/TE) > - forwarding performance and scaling requirements > > > - e.g., (number of nodes, network diameter, number of SID required in > max and average). For the latter, if possible using both SRv6 128-bit SIDs > and shorter (e.g. 32-bit) SIDs as the number would typically be different > (*). > > > - if the existing SRv6 approach is not deployable in their > circumstances, details of the requirement of a different solution is > required and whether this solution is needed for the short term only or for > the long term. > > > > As well as deployment limitations, we would like the SPRING community to > briefly describe the platform limitations that they are seeing which limit > the deployment of SRv6 In particular limitations related to the number of > SIDs which can be pushed and forwarded and how much the use of shorter SIDs > would improve the deployments . > > > > For both of these sets of feedback if possible, please post this to the > SPRING WG. If the information cannot be shared publicly, please send it > directly to the chairs & AD (Martin). > > > > This call for information will run for four weeks, up to 2019/09/03. As a > reminder, you can reach the SPRING chairs via spring-chairs@ietf.org and > ADs via spring-ads@ietf.org. > > > > Thank you, > > -- Rob & Bruno > > > > (*) As expressed on the mailing list, a 128 bit SID can encode two > instructions a node SID and an adjacency SID hence less SID may be required. > > > > > > Juniper Business Use Only > _______________________________________________ > spring mailing list > spring@ietf.org > https://www.ietf.org/mailman/listinfo/spring >
- [spring] Beyond SRv6. Rob Shakir
- Re: [spring] Beyond SRv6. Rob Shakir
- Re: [spring] Beyond SRv6. Andrew Alston
- Re: [spring] Beyond SRv6. 徐小虎(义先)
- Re: [spring] Beyond SRv6. Andrew Alston
- Re: [spring] Beyond SRv6. 徐小虎(义先)
- Re: [spring] Beyond SRv6. Yuji Kamite
- Re: [spring] Beyond SRv6. Zafar Ali (zali)
- Re: [spring] Beyond SRv6. Mark Smith
- Re: [spring] Beyond SRv6. Satoru Matsushima
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Fernando Gont
- Re: [spring] Beyond SRv6. Mark Smith
- Re: [spring] Beyond SRv6. Fernando Gont
- Re: [spring] Beyond SRv6. Mark Smith
- Re: [spring] Beyond SRv6. Sébastien Parisot
- Re: [spring] Beyond SRv6. Dirk Steinberg
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Tom Herbert
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Andrew Alston
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Andrew Alston
- Re: [spring] Beyond SRv6. Nick Hilliard
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Gaurav Dawra
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. James Guichard
- Re: [spring] Beyond SRv6. Mark Smith
- Re: [spring] Beyond SRv6. Mark Smith
- Re: [spring] Beyond SRv6. Mark Smith
- Re: [spring] Beyond SRv6. Joel M. Halpern
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Mark Smith
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Mark Smith
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Nick Hilliard
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Darren Dukes (ddukes)
- Re: [spring] Beyond SRv6. Voyer, Daniel
- Re: [spring] Beyond SRv6. Nick Hilliard
- Re: [spring] Beyond SRv6. Andrew Alston
- [spring] 答复: Beyond SRv6. Lizhenbin
- Re: [spring] Beyond SRv6. Henderickx, Wim (Nokia - BE/Antwerp)
- Re: [spring] Beyond SRv6. li zhenqiang
- Re: [spring] Beyond SRv6. Kamran Raza (skraza)
- Re: [spring] Beyond SRv6. Parag Kaneriya
- Re: [spring] Beyond SRv6. Shraddha Hegde
- Re: [spring] Beyond SRv6. Fernando Gont
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Tarek Saad
- Re: [spring] Beyond SRv6. Srihari Sangli
- Re: [spring] Beyond SRv6. Nick Hilliard
- Re: [spring] Beyond SRv6. Reji Thomas
- Re: [spring] Beyond SRv6. Sander Steffann
- Re: [spring] Beyond SRv6. Zafar Ali (zali)
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Zafar Ali (zali)
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Zafar Ali (zali)
- Re: [spring] Beyond SRv6. Zafar Ali (zali)
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. sthaug
- Re: [spring] Beyond SRv6. Andrew Alston
- Re: [spring] Beyond SRv6. Zafar Ali (zali)
- Re: [spring] Beyond SRv6. Zafar Ali (zali)
- Re: [spring] Beyond SRv6. Andrew Alston
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Zafar Ali (zali)
- Re: [spring] Beyond SRv6. Andrew Alston
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Srihari Sangli
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Tarek Saad
- Re: [spring] Beyond SRv6. Srihari Sangli
- Re: [spring] Beyond SRv6. Ca By
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Gyan Mishra
- [spring] 答复: Beyond SRv6.(CCDR Proposal) Aijun Wang
- Re: [spring] Beyond SRv6. 松嶋聡
- Re: [spring] Beyond SRv6. Dirk Steinberg
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Andy Smith (andsmit)
- Re: [spring] Beyond SRv6. Shraddha Hegde
- Re: [spring] Beyond SRv6. =?utf-8?B?SGlyb2Z1bWkgSWNoaWhhcmE=?=
- Re: [spring] Beyond SRv6. Satoru Matsushima
- Re: [spring] Beyond SRv6. =?utf-8?B?SGlyb2Z1bWkgSWNoaWhhcmE=?=
- Re: [spring] Beyond SRv6. xiechf@chinatelecom.cn
- Re: [spring] Beyond SRv6. Tom Herbert
- Re: [spring] Beyond SRv6. Bernier, Daniel
- Re: [spring] Beyond SRv6. Xiejingrong
- Re: [spring] Beyond SRv6. Mark Smith
- Re: [spring] Beyond SRv6. Tom Herbert
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Bernier, Daniel
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Brian E Carpenter
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Ron Bonica
- Re: [spring] Beyond SRv6. Tom Herbert
- Re: [spring] Beyond SRv6. Robert Raszuk
- Re: [spring] Beyond SRv6. Xiejingrong
- Re: [spring] Beyond SRv6. Bernier, Daniel
- Re: [spring] Beyond SRv6. Bernier, Daniel
- Re: [spring] Beyond SRv6. Zafar Ali (zali)
- Re: [spring] Beyond SRv6. Stewart Bryant
- [spring] “SRV6+” complexity in forwarding Darren Dukes (ddukes)
- Re: [spring] “SRV6+” complexity in forwarding Ron Bonica
- Re: [spring] “SRV6+” complexity in forwarding Andrew Alston
- Re: [spring] “SRV6+” complexity in forwarding Darren Dukes (ddukes)
- Re: [spring] “SRV6+” complexity in forwarding Tom Herbert
- Re: [spring] “SRV6+” complexity in forwarding Dirk Steinberg
- Re: [spring] “SRV6+” complexity in forwarding Gyan Mishra
- Re: [spring] “SRV6+” complexity in forwarding Gyan Mishra
- Re: [spring] “SRV6+” complexity in forwarding Mark Smith
- Re: [spring] “SRV6+” complexity in forwarding Mark Smith
- Re: [spring] “SRV6+” complexity in forwarding Gaurav Dawra
- Re: [spring] “SRV6+” complexity in forwarding Tom Herbert
- Re: [spring] “SRV6+” complexity in forwarding Ron Bonica
- Re: [spring] “SRV6+” complexity in forwarding Mark Smith
- Re: [spring] “SRV6+” complexity in forwarding Mark Smith
- Re: [spring] “SRV6+” complexity in forwarding Fred Baker
- Re: [spring] “SRV6+” complexity in forwarding Robert Raszuk
- Re: [spring] “SRV6+” complexity in forwarding Srihari Sangli
- Re: [spring] “SRV6+” complexity in forwarding Robert Raszuk
- Re: [spring] “SRV6+” complexity in forwarding Reji Thomas
- Re: [spring] “SRV6+” complexity in forwarding Robert Raszuk
- Re: [spring] “SRV6+” complexity in forwarding Reji Thomas
- Re: [spring] “SRV6+” complexity in forwarding Robert Raszuk
- Re: [spring] “SRV6+” complexity in forwarding Gyan Mishra
- Re: [spring] “SRV6+” complexity in forwarding Chengli (Cheng Li)
- Re: [spring] “SRV6+” complexity in forwarding Jeff Tantsura
- Re: [spring] “SRV6+” complexity in forwarding Robert Raszuk
- Re: [spring] “SRV6+” complexity in forwarding Stewart Bryant
- Re: [spring] “SRV6+” complexity in forwarding Robert Raszuk
- Re: [spring] “SRV6+” complexity in forwarding Ron Bonica
- Re: [spring] “SRV6+” complexity in forwarding Gyan Mishra
- Re: [spring] “SRV6+” complexity in forwarding Robert Raszuk
- Re: [spring] “SRV6+” complexity in forwarding Ron Bonica
- Re: [spring] =?utf-8?Q?=E2=80=9CSRV6+=E2=80=9D_?=… Jeff Tantsura
- Re: [spring] “SRV6+” complexity in forwarding Gyan Mishra
- Re: [spring] “SRV6+” complexity in forwarding Gyan Mishra