Router A sends query to Router B regarding 10.1.1.0/24 route, as there are no Feasible successors present.Also, there must be a reply received for every query, otherwise the route will always be in active state. When a router reponds to the query, it stops propagating on that part of the network, but queries are still propagating in the other parts of the network, as they are looking for a alternative path to the route.The queries then starts to propagate through the network depends to design/topology.If the alternative route is not found on any receiving neighbor router, then all the neighbor routers send queries to there neighbors except to those from where it received the query(Remember Split Horizon).If the alternative route is found on some neighbor device, then the query ends there.In EIGRP, if the route is established, and it is not looking to recompute it, then it is known to be in Passive State, but if the route is lost with no FS, then queries are sent out all neighboring interfaces to check the alternative path to the route. In EIGRP, if a router loses a route, and we don’t have a feasible successor(backup router)for that route, then it sends out queries to the neighboring routers to recompute the new route, this process takes the route into the active state. Minutes, because it knows the neighbor is available. Then the router does not terminate the neighbor relationship after three
If the neighbor responds with a SIA-Reply, A router sends its neighbor a SIA-QueryĪfter no reply to a normal query. Routers use SIA-Queries and SIA-Replies to prevent loss of a neighbor
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