Troubleshooting Miscellaneous EIGRP for IPv4 Issues

So far, your focus has been on troubleshooting EIGRP neighbor relationships and routes. Now your focus will be on troubleshooting issues related to feasible successors, discontiguous networks and autosummarization, route summarization, and equal and unequal metric load balancing.

Feasible Successors

The best route (lowest feasible distance [FD] metric) for a specific network in the EIGRP topology table becomes a candidate to be injected into the router’s routing table. (We use the term candidate because even though it is the best EIGRP route, there might be a better source of the same information that will be used instead.) If that route is indeed injected into the routing table, that route ...

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