Clearing the Topology Table and Querying Neighbors in EIGRP Networks
Once EIGRP has built a topology table and decided which paths are not looped, it needs some way to adjust to changes in that topology table. Because EIGRP uses nonperiodic updates, it does not time routes out of its table; the route must either be removed by new information from a neighbor, or through tearing down a neighbor relationship.
When a router loses its connection to a destination, it will examine its topology table first to determine if it has a feasible successor for that destination. If a feasible successor exists, the router will do the following:
Remove the old route.
Replace the old successor with the new one.
Re-compute the topology table for that destination. ...
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