Classic Loop Free Alternate Fast ReRoute
(LFA FRR)
• Per-prefix LFA: Simple, automatic, local, sub-
50msec fast reroute technique
• IGP pre-computes a backup path per
primary path per IGP destination:
per-path IP optimality
• The backup path is pre-installed in data plane
• Upon local failure, all the backup paths of the
impacted destinations are enabled in a prefix-
independent manner (<50msec loss of
connectivity)
4 5
2 31
6 7 8
Initial
LFA FRR
Post-convergence
Source
Dest1
Dest2
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