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. 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