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Some applications are highly sensitive to traffic loss lasting tens of milliseconds or more, yet typical router convergence after a link or node failure can take several hundred milliseconds. To minimize this loss, the router must rapidly activate a precomputed alternate repair path for all prefixes affected by the failure. IP FRR enables this by precomputing the repair path, allowing the router to switch to it immediately upon failure without waiting for full convergence.

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LDP over RSVP (also known as LDP tunneling) allows LDP-signaled LSPs to use RSVP-TE tunnels as forwarding shortcuts instead of following hop-by-hop IGP paths. Prior to this feature, LDP over RSVP was supported only with IS-IS as the IGP. This feature extends LDP over RSVP support to OSPF, enabling both headend (ingress) and transit functionality when OSPF is the IGP.

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