On Wed, Dec 11, 2019 at 3:37 AM Robert Raszuk <rob...@raszuk.net> wrote:
> Hi Brian, > > > Each SR node (Segment Endpoint) is effectively applying new IPv6 encap >> so is already doing an insertion of new SRH >> >> That isn't "insertion" in the sense of draft-voyer. > > > Correct. But we are not discussing draft-voyer here. > > I think recent mail threads prove that it is much better to discuss one > topic at a time rather then mix three different and pretty orthogonal > "issues" interchangeably. > > >> . It's prepending an extra layer of encapsulation, which is indeed just >> fine and I don't think anyone here is objecting to it. The spring draft >> currently uses (IMHO) imprecise language, even in its pseudo-code, but if >> all it's doing is describing successive layers of encapsulation that's fine >> too. Wasted bytes perhaps, but that isn't an IETF problem. > > > Great that we agree. > > >> Whether prepending new headers, each with their own SRH, is the best way >> of doing service-based traffic engineering is another question. Having just >> reviewed draft-ietf-bess-nsh-bgp-control-plane for Gen-ART, I do believe >> there's more than one possible approach. >> > > 100% agreed. In fact as you may have seen I have another non data plane, > but control plane proposal posted: > https://tools.ietf.org/html/draft-raszuk-teas-ip-te-np-00 > > Kind regards, > R. > Robert Your ip-te teas WG draft sounds like a fine solution and maybe can be used in conjunction with Gen-ART sfc draft in centralized SDN controller based architecture. So with draft is pulls the control plane function or Ti-LFA and SR-TE and/or binding SID policies into control plane nodes which could be the PEs eliminating SRH state in the P core. So this in essence using this feature we would save on overhead bytes with the additional 6in6 encap plus SRH state. Warm regards, Gyan > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > i...@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- > -- 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.mis...@verizon.com www.linkedin.com/in/networking-technologies-consultant
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