Under EIGRP feasibility conditions, a route is considered a feasible successor if its reported distance is lower than what?

In the context of Enhanced Interior Gateway Routing Protocol (EIGRP), a feasible successor is defined as a backup route that can be used if the primary route (successor) fails. For a route to qualify as a feasible successor, its reported distance must be less than the feasible distance of the successor route.

The feasible distance is the lowest calculated distance to a destination, which is the metric used by EIGRP to determine the best path to a destination. The reported distance refers to the distance reported by a neighboring router to reach the same destination. Therefore, as long as the reported distance of a potential backup route (feasible successor) is lower than the feasible distance of the currently selected route (successor), it fulfills the conditions to be considered a feasible successor.

This condition enables EIGRP to quickly switch to a feasible successor if the primary route fails, ensuring efficient route management and maintaining continuity in network communications. The concept emphasizes the importance of having alternative routes ready, contributing to the overall reliability and speed of EIGRP in responding to network topology changes.