Rashley Lv2Posted 19 Oct 2022 08:39
  
OSPF Loop-Free Alternate (LFA) Fast Reroute (FRR) enables OSPF to switch to a backup path quickly (within 50 ms) when a primary path fails. When the primary path fails, OSPF must re-run SPF to find a new path in the absence of LFA FRR. OSPF pre-computes a backup path and installs the backup next hop in the forwarding table when using LFA FRR.

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