Thanks Haoyu. Ok, so basically the SRH flag defined in draft-song-spring-siam <https://datatracker.ietf.org/doc/html/draft-song-spring-siam-02> would benefit all UDP packets including STAMP packets to quickly identify the UDP packets, right? There is also NH=UDP in the IPv6 header (when no inner IP header) that can help.
Thanks, Rakesh On Wed, Oct 16, 2024 at 6:54 PM Haoyu Song <haoyu.s...@futurewei.com> wrote: > Hi Rakesh, > > > > I’m not sure. The intermediate nodes are not supposed to check the SRH, > right? If so, a flag in SRH doesn’t help. > > > > On the other hand, RFC 8986 said “It is *RECOMMENDED* that an > implementation of local configuration only allows Upper-Layer header > processing of types that do not result in the packet being forwarded (e.g., > ICMPv6).” I don’t know how to interpret this sentence. If the upper header > is UDP, the packet will be forwarded, right? Does that mean that it is not > recommended to configure the processing of UDP as the upper layer protocol. > Then a flag bit might be useful. > > > > Haoyu > > > > *From:* Rakesh Gandhi <rgandhi.i...@gmail.com> > *Sent:* Wednesday, October 16, 2024 1:22 PM > *To:* spring <spring@ietf.org>; Haoyu Song <haoyu.s...@futurewei.com> > *Subject:* Re: [spring] I-D Action: draft-ietf-spring-stamp-srpm-03.txt > > > > Hi Haoyu, > > > > Catching-up on the old email thread. > > > > Is this new SRH flag needed for intermediate nodes to process UDP header? > > > > For the end-point nodes, there is upper layer header procedure defined in > RFC 8986 that is used by the draft. > > > > https://www.rfc-editor.org/rfc/rfc8986.html#name-upper-layer-header > > > > Thanks, > > Rakesh > > > > > > -----Original Message----- > > Re: [spring] I-D Action: draft-ietf-spring-stamp-srpm-03.txt > > From: Haoyu Song <haoyu.s...@futurewei.com> Wed, 02 February 2022 19:33 > UTC > > Hi Rakesh and the other authors, > > > > Since this draft also propose to use UDP for active measurement in SRv6, > I'd like to suggest that a flag bit in SRH is used to indicate that. > The reasons are twofold: (1) routers may only look at L3 header for > forwarding without examining the L4 header. > So if a test packet can only be identified by UDP port, it may be missed; (2) > it's possible to use the > same mechanism to support other kinds of active measurements > (e.g., HBH IOAM as proposed in our draft > https://datatracker.ietf.org/doc/html/draft-song-spring-siam-02. > > > > Best, > > Haoyu > > > > -----Original Message----- > > From: spring <spring-boun...@ietf.org> <<spring-boun...@ietf.org>> On > Behalf Of internet-dra...@ietf.org > > Sent: Tuesday, February 1, 2022 4:19 PM > > To: i-d-annou...@ietf.org > > Cc: spring@ietf.org > > Subject: [spring] I-D Action: draft-ietf-spring-stamp-srpm-03.txt > > > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > > This draft is a work item of the Source Packet Routing in Networking WG of > the IETF. > > > > Title : Performance Measurement Using Simple TWAMP (STAMP) > for Segment Routing Networks > > Authors : Rakesh Gandhi > > Clarence Filsfils > > Daniel Voyer > > Mach(Guoyi) Chen > > Bart Janssens > > Richard Foote > > Filename : draft-ietf-spring-stamp-srpm-03.txt > > Pages : 24 > > Date : 2022-02-01 > > > > Abstract: > > Segment Routing (SR) leverages the source routing paradigm. SR is > > applicable to both Multiprotocol Label Switching (SR-MPLS) and IPv6 > > (SRv6) data planes. This document describes procedures for > > Performance Measurement in SR networks using the mechanisms defined > > in RFC 8762 (Simple Two-Way Active Measurement Protocol (STAMP)) and > > its optional extensions defined in RFC 8972 and further augmented in > > draft-ietf-ippm-stamp-srpm. The procedure described is applicable to > > SR-MPLS and SRv6 data planes and is used for both links and end-to- > > end SR paths including SR Policies. > > > > > > > > Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts > > > > > > _______________________________________________ > > spring mailing list > > spring@ietf.org > > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fspring&data=04%7C01%7Chaoyu.song%40futurewei.com%7C9e9ebc01c8c942755a2d08d9e5e1c397%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637793580085471585%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=laC%2B5pQbD7tnmE34VUJRR0s19LoPnEipFQbPe0PwfqE%3D&reserved=0 > <https://www.ietf.org/mailman/listinfo/spring> > > > >
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