|IP Routing Technologies
What does a router do if it has no EIGRP feasible successor route to a destination network and the successor route to that destination network is in active status?
It routes all traffic that is addressed to the destination network to the interface indicated in the routing table.
It sends a copy of its neighbor table to all adjacent routers.
It sends a multicast query packet to all adjacent neighbors requesting available routing paths to the destination network.
It broadcasts Hello packets to all routers in the network to re-establish neighbor adjacencies.
When there are no feasible successors, a route goes into Active state and a route re-computation occurs. A route re-computation commences with a router sending a query packet to all neighbors. Neighboring routers can either reply if they have feasible successors for the destination or optionally return a query indicating that they are performing a route re-computation. While in Active state, a router cannot change the next-hop neighbor it is using to forward packets. Once all replies are received for a given query, the destination can transition to Passive state and a new successor can be selected. When a link to a neighbor that is the only feasible successor goes down, all routes through that neighbor commence a route re-computation and enter the Active state.