You are evaluating convergence characteristics of various interior gateway protocols for a new network design. Which technology allows link-state routing protocols to calculate paths to destination pr

Incremental Shortest Path First (iSPF) speeds up SPF recalculation after a topology change by recomputing only affected portions of the tree, but it does not pre-compute backup paths.

Cisco MPLS-TE FRR provides fast reroute using pre-signaled RSVP-TE backup tunnels in an MPLS environment; it is not a native link-state IGP mechanism analogous to feasible successors.

Loop-Free Alternate Fast Reroute uses existing SPF results to pre-compute alternate next-hops satisfying a loop-free condition - the neighbor's distance to the destination must be less than the local distance plus the link cost - which is functionally equivalent to EIGRP's feasibility condition used to qualify feasible successors, enabling immediate pre-computed failover in link-state protocols.

Partial route calculation (PRC) optimizes SPF by recalculating only routes affected by a prefix change rather than the full tree, reducing CPU load but not providing pre-computed loop-free alternate paths.

Fast-Flooding accelerates the distribution of LSAs or LSPs after a topology change, which speeds up convergence indirectly but does not pre-compute loop-free alternate backup paths.