A. show ip route eigrp
B. show ip eigrp topology
C. show ip eigrp topology all-links
D. show ip eigrp topology zero-successors
Explanation:
The show ip eigrp topology all-links command displays both feasible successors and non-feasible successors to a given destination network. This command displays the contents of the topology table and shows all the routes available for a given destination network.
An example of partial output of the command is below:
The 172.20.2.0/24 network has a feasible successor. This can be determined by looking at the values in the parenthesis next to each route. The second value after the / is the advertised distance from the successor. This value must be less than the value of the feasible distance for a route to be considered a feasible successor. There are two routes for 172.20.2.0/24. The first route listed, via 172.17.3.1, is the successor route. Its cost is 246983122, which matches the feasible distance (FD). The second route, via 172.17.1.1, has an advertised distance of 2443698 (the second value in the parentheses after the /). Because this value is less than the FD (2413698), it qualifies as a feasible successor.
The 172.25.1.0/24 network does not have a feasible successor. The second route listed via 172.17.1.1 has an advertised distance of 2501649, which is greater than the value of the FD, (2416381). Therefore, it is not a feasible successor.
You should not use the show ip route eigrp command. This command displays only the best metric routes (successors) to a given destination network. A route has the best metric if it has the least feasible distance, which refers to the sum of the metric from a given neighbor to a destination network and the metric to reach that neighbor.
You should not use the show ip eigrp topology command without the all-links parameter. This command displays only the feasible successors to a given destination network.
You should not use the show ip eigrp topology zero-successors command because this command lists those routes that do not have a valid successor.
Objective:
Layer 3 Technologies
Sub-Objective:
Configure and verify policy-based routing
References:
Cisco IOS IP Routing: EIGRP Command Reference > show ip eigrp topology