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?

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?
A . It routes all traffic that is addressed to the destination network to the interface indicated in the routing table.
B . It sends a copy of its neighbor table to all adjacent routers.
C . It sends a multicast query packet to all adjacent neighbors requesting available routing paths to the destination network.
D . It broadcasts Hello packets to all routers in the network to re-establish neighbor adjacencies.

View Answer

Answer: C

Explanation:

Introduction to EIGRP

Reference:

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml

Feasible Successors

A destination entry is moved from the topology table to the routing table when there is a feasible successor. All minimum cost paths to the destination form a set. From this set, the neighbors that have an advertised metric less than the current routing table metric are considered feasible successors.

Feasible successors are viewed by a router as neighbors that are downstream with respect to the destination.

These neighbors and the associated metrics are placed in the forwarding table.

When a neighbor changes the metric it has been advertising or a topology change occurs in the network, the set of feasible successors may have to be re-evaluated.

However, this is not categorized as a route recomputation.

Route States

A topology table entry for a destination can have one of two states. A route is considered in the Passive state when a router is not performing a route recomputation. The route is in Active state when a router is undergoing a route recomputation. If there are always feasible successors, a route never has to go into Active state and avoids a route recomputation.

When there are no feasible successors, a route goes into Active state and a route recomputation occurs. A route recomputation 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 recomputation. 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 recomputation and enter the Active state.