Re: [IPv6] 6MAN: looking for feedback to draft-eckert-6man-qos-exthdr-discuss (Re: New Version Notification for ...)
Tim Chown <Tim.Chown@jisc.ac.uk> Tue, 05 March 2024 14:41 UTC
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From: Tim Chown <Tim.Chown@jisc.ac.uk>
To: Tom Herbert <tom=40herbertland.com@dmarc.ietf.org>
CC: Toerless Eckert <tte@cs.fau.de>, "ipv6@ietf.org" <ipv6@ietf.org>, "draft-eckert-6man-qos-exthdr-discuss@ietf.org" <draft-eckert-6man-qos-exthdr-discuss@ietf.org>
Thread-Topic: [IPv6] 6MAN: looking for feedback to draft-eckert-6man-qos-exthdr-discuss (Re: New Version Notification for ...)
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Date: Tue, 05 Mar 2024 14:41:24 +0000
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Subject: Re: [IPv6] 6MAN: looking for feedback to draft-eckert-6man-qos-exthdr-discuss (Re: New Version Notification for ...)
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Hi, On 4 Mar 2024, at 23:02, Tom Herbert <tom=40herbertland.com@dmarc.ietf.org> wrote: On Mon, Mar 4, 2024 at 12:37 PM Toerless Eckert <tte@cs.fau.de> wrote: Dear 6MAN-WG: I have just posted an extremely rough draft draft-eckert-6man-qos-exthdr-discuss, to help start a discussion about common IPv6 extension headers for (mostly) stateless QoS beyond what we can do with just DSCP. Hi Toerless, You might want to look at draft-herbert-fast and draft-herbert-host2netsig. It looks like these have similar goals. And that is similar in spirit to what the CERN experiments are doing with flow label semantics, which would/could be HbH header information if then insertion penalty were not so high. https://www.ietf.org/archive/id/draft-cc-v6ops-wlcg-flow-label-marking-02.html And there are others, each doing something slightly different, when we’d ideally have one EH to rule them all. Tim Right now this is a discussion draft not intended to become RFC because it's my impression that the 6MAN community might benefit from some useful summary of how DetNet (and potentially other WGs) might use this work, but this would not be part of a final spec draft, and likewise i have a wide range of open questions instead of answers, and i included those questions into the draft seeking for feedback from 6MAN. Overall, i didn't want to go down a possible rabbit hole of working on details of the spec if it just turns out to involve insurmountable IETF process obtacles to go this route. For example, we could continue to standardize all advanced forwarding functions only into MPLS and ignore IPv6 as DetNet has done so far (*mumble ;-). The lack of such extension headers has IMHO held back innovation into better (stateless) QoS, especially in many controlled networks since at least 25 years, for example when draft-stoica-diffserv-dps was abandomed because it was too painfull trying to get to through all the IETF IPv6 bureaucracy - for just one algorithm, when there are so many that would deserve experimentation in specific networks. But given the good recent/ongoing work for example into I-D.ietf-6man-hbh-processing, i would hope that we're closer now to actually wanting our extensibility of IPv6 actually be used by the industry (instead of all this happening only in MPLS). With DetNet we are too in the situation that we have multiple candidates on the table and IMHO it will not be very useufl trying to run a lottery for a single "winner" and standardize just that. I have seen a lot more success in the industry by just letting different algorithms compete with each othrer in products and let the market decide. That was quite a lot happening in e.g.: packet scheduling in routers at least since the end of the 90th when in my impression every new hardware forwarding router implemented it's own new packet scheduler based on the just hired lead engineers PhD thesis. And over a period of 20 years, a lot of commonality and industry knowledge evolved in that space. For this type of scheduling, this innovation was possible because it did not require new packet headers, but just a lot of (ab)use of DSCP and/or more or less horrenduous QoS configurations. But for those solutions that do require additional in-packet-QoS metadata, we never created a viable method where it was easy for the innovators/implementers to concentrate on the novelties of the algorithm in question and get all the knucklehead "how to packetize and what generic requirements/functionalities" be provided as much as possible by an existing framework/RFC. So, i'd be very happy to find interest to help progress this work, aka: writing something that ultimately would become a draft-ietf-6man-common-qos-exthr or the like. I have tentatively asked for a slot for IETF119 6MAN to present and get feedback, if you think that would be time well spent, pls. chime in. Cheers Toerless, for the authors On Mon, Mar 04, 2024 at 12:30:53PM -0800, internet-drafts@ietf.org wrote: A new version of Internet-Draft draft-eckert-6man-qos-exthdr-discuss-00.txt has been successfully submitted by Toerless Eckert and posted to the IETF repository. Name: draft-eckert-6man-qos-exthdr-discuss Revision: 00 Title: Considerations for common QoS IPv6 extension header(s) Date: 2024-03-04 Group: Individual Submission Pages: 27 URL: https://www.ietf.org/archive/id/draft-eckert-6man-qos-exthdr-discuss-00.txt Status: https://datatracker.ietf.org/doc/draft-eckert-6man-qos-exthdr-discuss/ HTMLized: https://datatracker.ietf.org/doc/html/draft-eckert-6man-qos-exthdr-discuss Abstract: This document is written to start a discussion and collect opinions and ansers to questions raised in this document on the issue of defining IPv6 extension headers for DETNET-WG functionality with IPv6. The IETF Secretariat -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
- [IPv6] 6MAN: looking for feedback to draft-eckert… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tom Herbert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Brian E Carpenter
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tim Chown
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Vasilenko Eduard
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tom Herbert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tim Chown
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tim Chown
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tom Herbert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tom Herbert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tom Herbert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Vasilenko Eduard
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Brian E Carpenter
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tom Herbert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Brian E Carpenter
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Ole Trøan
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tom Herbert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tim Chown
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tom Herbert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Brian E Carpenter
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Brian E Carpenter
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tim Chown
- [IPv6] Flow label BCP [was: looking for feedback … Brian E Carpenter
- Re: [IPv6] Flow label BCP [was: looking for feedb… Tom Herbert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Brian E Carpenter
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] Flow label BCP [was: looking for feedb… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tom Herbert
- Re: [IPv6] Flow label BCP [was: looking for feedb… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tom Herbert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tom Herbert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] Flow label BCP [was: looking for feedb… Tom Herbert
- Re: [IPv6] Flow label BCP [was: looking for feedb… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Toerless Eckert
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Brian E Carpenter
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tim Chown
- Re: [IPv6] Flow label BCP [was: looking for feedb… Dale W. Carder
- Re: [IPv6] 6MAN: looking for feedback to draft-ec… Tim Chown
- Re: [IPv6] Flow label BCP [was: looking for feedb… Tom Herbert
- Re: [IPv6] Flow label BCP [was: looking for feedb… Mark Smith