OSPF Remote Loop Free Alternate (LFA)

You can configure a remote loop-free alternate (LFA) to extend the backup provided by the LFA in an OSPF network. This feature is useful especially for Layer 1 metro-rings where the remote LFA is not directly connected to the PLR. The existing LDP implemented for the MPLS tunnel setup can be reused for the protection of OSPF networks and subsequent LDP destinations thereby eliminating the need for RSVP-TE backup tunnels for backup coverage.