What command will show which interface(s) EIGRP is running on?

The command that displays which interface(s) EIGRP is actively running on is the command that provides specific details about EIGRP interfaces, including the status of each interface in relation to EIGRP. When this command is executed, it reveals not only the interfaces participating in EIGRP but also pertinent information such as the EIGRP metrics being used, the number of neighbors on each interface, and other relevant operational status data.

Using this command is particularly beneficial for network engineers who need to troubleshoot or optimize their EIGRP configurations, as it gives a clear view of EIGRP’s operational status on a per-interface basis. Understanding the performance and activity of EIGRP on specific interfaces is crucial in ensuring network efficiency and reliability.

The other commands listed provide different sets of information: the topology command focuses on the EIGRP database itself, the neighbor command lists adjacent routers rather than interface status, and the interfaces command is not applicable in many environments, which is why they do not correctly indicate which interfaces EIGRP is utilizing.