Last Call: <draft-ietf-pim-mofrr-tilfa-09.txt> (Multicast-only Fast Reroute Based on Topology Independent Loop-free Alternate Fast Reroute) to Informational RFC

The IESG <iesg-secretary@ietf.org> Tue, 04 February 2025 15:59 UTC

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From: The IESG <iesg-secretary@ietf.org>
To: IETF-Announce <ietf-announce@ietf.org>
Subject: Last Call: <draft-ietf-pim-mofrr-tilfa-09.txt> (Multicast-only Fast Reroute Based on Topology Independent Loop-free Alternate Fast Reroute) to Informational RFC
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Date: Tue, 04 Feb 2025 07:59:34 -0800
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The IESG has received a request from the Protocols for IP Multicast WG (pim)
to consider the following document: - 'Multicast-only Fast Reroute Based on
Topology Independent Loop-free
   Alternate Fast Reroute'
  <draft-ietf-pim-mofrr-tilfa-09.txt> as Informational RFC

The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
last-call@ietf.org mailing lists by 2025-02-18. Exceptionally, comments may
be sent to iesg@ietf.org instead. In either case, please retain the beginning
of the Subject line to allow automated sorting.

Abstract


   This document specifies the use of Topology Independent Loop-Free
   Alternate (TI-LFA) mechanisms with Multicast Only Fast ReRoute
   (MoFRR) for Protocol Independent Multicast (PIM).  The TI-LFA
   mechanism is designed for standard link-state Interior Gateway
   Protocol (IGP) shortest path and Segment Routing (SR) scenarios.  TI-
   LFA provides fast reroute protection for unicast traffic in IP
   networks by precomputing backup paths that avoid potential failures.
   By integrating TI-LFA with MoFRR, this document extends the benefits
   of fast reroute mechanisms to multicast traffic, enabling enhanced
   resilience and minimized packet loss in multicast networks.  The
   document outlines the necessary protocol extensions and operational
   considerations to implement TI-LFA in conjunction with MoFRR for PIM,
   ensuring that multicast traffic is rapidly rerouted in the event of a
   failure.  This document uses the backup path computed by TI-LFA
   through IGP as a secondary Upstream Multicast Hop (UMH) for PIM.  By
   using the TI-LFA backup path to send PIM secondary join messages hop-
   by-hop, it achieves the generation of a fast reroute backup path for
   PIM multicast.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-pim-mofrr-tilfa/


The following IPR Declarations may be related to this I-D:

   https://datatracker.ietf.org/ipr/5730/

Last Call: <draft-ietf-pim-mofrr-tilfa-09.txt> (M… The IESG