What can happen when a route is lost in EIGRP?

When a route is lost in EIGRP (Enhanced Interior Gateway Routing Protocol), a query may be generated to EIGRP neighbors. This is a critical part of how EIGRP ensures reliable and efficient routing in a network. When a route becomes unreachable, EIGRP uses a mechanism called the query process to find alternative paths. The router that detects the loss of the route sends out queries to its neighbors asking if they have a feasible successor for the lost route. This helps maintain network stability by allowing the routers to collaboratively determine the best path available through their respective routing tables.

This process is initiated to ensure that the loss of a route doesn’t lead to network outages or suboptimal routing; instead, EIGRP quickly seeks alternative paths to maintain connectivity. As a result, routers within the EIGRP domain can achieve rapid convergence and recover from topology changes efficiently.