Troubleshooting EIGRP for IPv4 Routes
EIGRP only learns from directly connected neighbors, making it easy to follow the path of routes when troubleshooting. For example, if R1 does not know about the route but its neighbor does, there is more than likely something wrong between the neighbors. However, if the neighbor does not know about it either, you can focus on the neighbors’ neighbor and so on.
As we have discussed already, neighbor relationships are the foundation for EIGRP information sharing. If we have no neighbors, we will not learn any routes. So, besides the lack of a neighbor, what would be reasons for missing routes in an EIGRP network? Following is a listing of some common reasons as to why EIGRP routes might be missing either in ...
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