[Pals] Questions about PW Status bits in RFC 6073

Alexander Vainshtein <Alexander.Vainshtein@rbbn.com> Sun, 06 August 2023 10:16 UTC

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From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
To: "pals@ietf.org" <pals@ietf.org>
CC: "Andrew G. Malis" <agmalis@gmail.com>, Stewart Bryant <stewart.bryant@gmail.com>, "Bocci, Matthew (Nokia - GB)" <matthew.bocci@nokia.com>
Thread-Topic: Questions about PW Status bits in RFC 6073
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Date: Sun, 06 Aug 2023 10:16:27 +0000
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Subject: [Pals] Questions about PW Status bits in RFC 6073
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Hi all,
I have a couple of questions about Section 10.1 of RFC 6073, and I would appreciate a timely response from the authors and/or the WG.

The context for my questions is signaled PW segments that run in tunnel LSPs that have been set up using such protocols as LDP, RSVP-TE or SR.


  1.  The text in the RFC discusses local PSN-facing Receive and Transmit faults for each of the PW segments. Detecting a local PSN-facing Transmit fault in the context I have in mind is simple, but how can the S-PE detect a local PSN-facing Receive fault?
  2.  The text in Section 10.1.2 discusses handling of local PSN-facing Transmit fault and suggests sending different PW status bits to the two peers:
     *   A local PSN-facing Transmit fault is sent to the peer for which the fault is detected. This is obvious, and the corresponding 32-bit status is stored by the S-PE
     *   A local PSN-facing Receive fault is sent to the "other" peer but not stored by the S-PE. Can somebody please clarify why this is needed, and why the corresponding status is not stored?

Regards, and lots of thanks in advance,
Sasha

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