When an EIGRP router detects a topology change, how does the router notify neighbor routers that a new route calculation is required for a specific route?
- An EIGRP query packet is sent out with the delay set to infinity.
- An EIGRP update packet is sent out with a metric value of zero.
- A route withdrawal is sent out, notifying other neighbors to remove the route from the topology table.
Explanation: An EIGRP update packet is sent out with the topology change notification flag set.
If a feasible successor is not available for a route, DUAL performs a new route calculation. The route state changes from passive to active in the EIGRP topology table. The router detecting the topology change sends out query packets to EIGRP neighbors for the route. A query packet includes the network prefix with the delay set to infinity so that other routers are aware that it is now active.