Jay Taruc Lv2Posted 19 Oct 2022 10:20
  
OSPF Loop-Free Alternate  Fast Reroute 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.

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