Multicast-Only Fast Reroute Based on Topology Independent Loop-Free Alternate Fast Reroute
RFC 9860, “Multicast-Only Fast Reroute Based on Topology Independent Loop-Free Alternate Fast Reroute”, is an Informational document published in October 2025 by Y. Liu, M. McBride, Z. Zhang, J. Xie, C. Lin. The canonical text is published by the RFC Editor.
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 provides Fast Reroute (FRR) 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 FRR mechanisms to multicast traffic, enabling enhanced resilience and minimized packet loss in multicast networks. The document outlines an optional approach to implement TI-LFA in conjunction with MoFRR for PIM, ensuring that multicast traffic is rapidly rerouted in the event of a failure.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
The canonical text of RFC 9860 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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