when router loss the connectivity or it found nework is down then it will send the query to its neighbour in order to find out any alternet and enter into the active state and start its active timer...and wait for the response...if router recive response then then router enter into the passive state...if router donot find response then it will enter in to the SIA state after the active timer expire...
I'd recommend jeff doyle's book routing tcp/ip second edition.
A topology-table entry for a destination can exist in one of two states: active or passive. A destination is in the passive state when the router is not performing a recomputation; it is in the active state when the router is performing a recomputation. If feasible successors are always available, a destination never has to go into the active state, thereby avoiding a recomputation.
A recomputation occurs when a destination has no feasible successors. The router initiates the recomputation by sending a query packet to each of its neighboring routers. The neighboring router can send a reply packet, indicating that it has a feasible successor for
the destination, or it can send a query packet, indicating that it is participating in the recomputation. While a destination is in the active state, a router cannot change the destination's routing-table information. After the router has received a reply from each neighboring router, the topology-table entry for the destination returns to the passive state, and the router can select a successor." from CISCO
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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