[Teas] A gap between Section 5 of RFC 4090 and Section 4.4.3 of RFC 3209

Alexander Vainshtein <Alexander.Vainshtein@rbbn.com> Tue, 27 August 2024 10:39 UTC

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From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
To: mpls <mpls@ietf.org>
Thread-Topic: A gap between Section 5 of RFC 4090 and Section 4.4.3 of RFC 3209
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Date: Tue, 27 Aug 2024 10:39:00 +0000
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Subject: [Teas] A gap between Section 5 of RFC 4090 and Section 4.4.3 of RFC 3209
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Hi all,
I would like to share with you what I see as a gap between Section 5 of RFC 4090<https://datatracker.ietf.org/doc/html/rfc4090#section-5> and Section 4.4.3 of RFC 3209<https://datatracker.ietf.org/doc/html/rfc3209#section-4.4.3>:


  1.  The former states that " The head-end LSR of a protected LSP MUST set the "label recording desired" flag in the SESSION_ATTRIBUTE object."
     *   Label recording uses Label subojects of the Record Route Object (RRO), so that this statement implies usage of RRO at least in the Resv messages used for signaling a protected LSP
     *   However, inclusion of RRO in the Path messages used for signaling a protected LSP by the head-end is not mentioned at all
  2.  The last para of the latter states that "A received Path message without an RRO indicates that the sender node no longer needs route recording.  Subsequent Resv messages SHALL NOT contain an RRO."

We have encountered a widely deployed implementation that does not include RRO in the Path messages generated by the head-end LSR of protected LSRs but includes RRO (with Label subobjects) in the Resv messages generated in response to this Path messages.

I wonder whether an Erratum describing the gap between the two RFCs should be filed, or some other action should be taken to resolve the observed contradiction.

I would highly appreciated any feedback on the subject.

Regards, and lots of thanks in advance,
Sasha

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