This feature allows configuring backup entries for static MPLS LFIB routes via EOS SDK RPC to be activated if its corresponding primary entries are unable to forward traffic due to next hops being unresolved or its corresponding interface being down. Any backup entries will not be activated to forward traffic until all primary entries are unviable. Thereby, backup entries configured for the Static MPLS routes are a mechanism to achieve fast failover when the primary path fails.

This feature allows configuring backup nexthop group entries to be used if their corresponding primary entries are unable to forward traffic due to being unresolved or with outgoing interfaces that are marked as down. By default, any configured backup entries will not be activated to forward traffic until all primary nexthop group entries are unavailable. Backup nexthop group entries are a tool used to achieve fast failover when forwarding traffic via nexthop groups.