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The Query and Reply Process
In EIGRP, the query and reply process is an important part of the convergence process. When a router detects a network change and updates its routing table, it sends an update message to its neighbors. If a neighbor has a different route to the same destination network, it sends a query message back to the original router requesting more information.
The query message is sent out to all neighbors except the original router, and each neighbor responds with the best route it knows to the destination network. The original router then updates its routing table based on the responses it receives. Once it has found a feasible successor (a backup route that can be used if the primary route fails), it sends a reply message back to the neighbor that sent the query.
If a router doesn’t receive a reply to its query within a certain amount of time (known as the “active timer”), it assumes that the route is no longer reachable and sends an update message to its neighbors to remove it from their routing tables.
The query and reply process is designed to ensure that all routers in the network have the same routing information and to avoid routing loops. By exchanging information in this way, EIGRP can converge quickly and efficiently in response to network changes.
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