Which statements are true about EIGRP successor routes? (Choose two.)

Which statements are true about EIGRP successor routes? (Choose two.)
A . A successor route is used by EIGRP to forward traffic to a destination.
B . Successor routes are saved in the topology table to be used if the primary route fails.
C . Successor routes are flagged as ‘active’ in the routing table.
D . A successor route may be backed up by a feasible successor route.
E . Successor routes are stored in the neighbor table following the discovery process.

View Answer

Answer: A, D

Explanation:

Introduction to EIGRP

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.