rivsy Lv5Posted 17 Oct 2022 10:13
  
OSPF Loop-Free Alternate (LFA) Fast Reroute (FRR) allows OSPF to quickly switch (within 50 ms) to a backup path when a primary path fails. Without LFA FRR, OSPF has to re-run SPF to find a new path when the primary path fails. With LFA FRR, OSPF pre-computes a backup path and installs the backup next hop in the forwarding table.

Please see below picture for topology

loop free config.png (79.15 KB, Downloads: 1175)

loop free config.png

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