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[bess] rfc9251

Alexander Vainshtein <Alexander.Vainshtein@rbbn.com> Sun, 17 March 2024 12:01 UTC

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From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
To: "rfc9251@ietf.org" <rfc9251@ietf.org>
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Date: Sun, 17 Mar 2024 12:00:58 +0000
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Subject: [bess] rfc9251
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Hi all,
I have a question regarding expected DP behavior in conjunction with RFC 9521: Are the PEs that support this RFC expected to decrement TTL in IP headers of multicast IP packets they forward?

This question is equally applicable to the "last mile" PEs that have received IGMP/MLD Joins and advertised them as SMET routes, and to the "first mile" PEs that receive and install these SMET routes.

The context for this question is my understanding that multicast IP traffic that is forwarded based on IMET route (e.g., to the PEs that have not advertised ability to advertise SMET routes)   does not undergo TTL decrement.

I have failed to find an answer to my question in the text of RFC 9251.

Your timely feedback would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

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