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When EIGRP first queries its neighbor, a stuck in active timer starts.

The problem is that, if there are no query boundaries, EIGRP potentially can ask every router in the network for a lost route. The lost route is unknown to the neighbors.All queries are answered from all the neighbors.The query stops if one of the following occurs: If the neighbor doesn't know the status of the route, the neighbor asks its neighbors, and so on, until the edge of the network is reached. The only way for EIGRP to converge quickly is to query its neighbors about the unavailable route. Now, if the primary route is gone and no feasible successor is available, the route is in active state.

When the primary route is not available, EIGRP immediately uses the feasible successor as the backup route. EIGRP keeps a list of backup routes called feasible successors. EIGRP relies only on its neighbors for information on network reachability and availability. Refer to Chapter 6 for thorough coverage of the DUAL process, although it is reviewed here as well.ĮIGRP is an advanced distance-vector protocol it doesn't have LSA flooding, like OSPF, or a linkstate protocol to tell the protocol the overall view of the network. To resolve an EIGRP stuck in active error, you need to understand the DUAL process in EIGRP. This section discusses the method of troubleshooting the EIGRP stuck in active error. %DUAL-3-SIA: Route network mask stuck-in-active state in IP-EIGRP AS. Sometimes, EIGRP resets the neighbor relationship because of a "stuck in active" condition.