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Comparison with Other Methods: Differences U-turn Alternates: Computational complexity is less ( O(neighbors) ) No encapsulation is needed. No set-up, monitoring or maintenance of explicit tunnels is required. Particularly important because tunnels may need to change when the topology does. This can leave protection gaps while the new tunnels are created. No added complexity or support to learn mechanism for directed forwarding. No new adjacencies (such as for LDP) need to be considered. I.e. a targeted LDP session isn’t necessary to learn the labels understood by a neighbor’s neighbor. Simply works for LDP. Lowest impact on security Goal is to simplify operations and provide local protection – not to make so complex that RSVP-TE Fast-Reroute is preferable |