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Routing & Switching · Advanced

Topology-Independent Loop-Free Alternate (TI-LFA)

A segment routing fast reroute method that provides 100 percent link, node and SRLG protection using the post-convergence path.

Definition

TI-LFA computes the path traffic will take after convergence and encodes it with a segment list pushed at the point of local repair. It avoids micro-loops and needs no targeted LDP sessions, unlike remote LFA.

Example

fast-reroute per-prefix ti-lfa under the IS-IS interface

Exam tip

TI-LFA guarantees coverage in any topology; classic LFA does not.

Related terms