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RFC 9855
Title: Topology Independent Fast Reroute Using
Segment Routing
Author: A. Bashandy,
S. Litkowski,
C. Filsfils,
P. Francois,
B. Decraene,
D. Voyer
Status: Standards Track
Stream: IETF
Date: October 2025
Mailbox: [email protected],
[email protected],
[email protected],
[email protected],
[email protected],
[email protected]
Pages: 23
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-rtgwg-segment-routing-ti-lfa-21.txt
URL: https://www.rfc-editor.org/info/rfc9855
DOI: 10.17487/RFC9855
This document presents Topology Independent Loop-Free Alternate
(TI-LFA) Fast Reroute (FRR), which is aimed at providing protection
of node and Adjacency segments within the Segment Routing (SR)
framework. This FRR behavior builds on proven IP FRR concepts being
LFAs, Remote LFAs (RLFAs), and Directed Loop-Free Alternates (DLFAs).
It extends these concepts to provide guaranteed coverage in any
two-connected networks using a link-state IGP. An important aspect of
TI-LFA is the FRR path selection approach establishing protection
over the expected post-convergence paths from the Point of Local
Repair (PLR), reducing the operational need to control the tie-breaks
among various FRR options.
This document is a product of the Routing Area Working Group Working Group of
the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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