This document presents Topology Independent Loop-free Alternate Fast
Reroute (TI-LFA), aimed at providing protection of node and adjacency
segments within the Segment Routing (SR) framework. This Fast
Reroute (FRR) behavior builds on proven IP Fast Reroute concepts
being LFAs, remote LFAs (RLFA), and remote LFAs with directed
forwarding (DLFA). 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, reducing the operational need to control
the tie-breaks among various FRR options.
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