Topology Independent Fast Reroute using Segment Routing

Document Type Expired Internet-Draft (rtgwg WG)
Last updated 2019-09-06 (latest revision 2019-03-05)
Replaces draft-bashandy-rtgwg-segment-routing-ti-lfa
Stream IETF
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document presents Topology Independent Loop-free Alternate Fast Re-route (TI-LFA), aimed at providing protection of node and adjacency segments within the Segment Routing (SR) framework. This Fast Re-route (FRR) behavior builds on proven IP-FRR concepts being LFAs, remote LFAs (RLFA), and remote LFAs with directed forwarding (DLFA). It extends these concepts to provide guaranteed coverage in any IGP network. A key aspect of TI-LFA is the FRR path selection approach establishing protection over the expected post-convergence paths from the point of local repair, dramatically reducing the operational need to control the tie-breaks among various FRR options.


Stephane Litkowski (
Ahmed Bashandy (
Clarence Filsfils (
Bruno Decraene (
Pierre Francois (
Daniel Voyer (
Francois Clad (
Pablo Garvia (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)