However, when Router X sends a hello message back to Router
Y using key 2, an authentication mismatch will occur. From the perspective of Router X, the
relationship appears to be up for a while, but then it times out, as illustrated by the messages that
were received on Router X, shown in Example 5-20. The output of the show ip eigrp neighbors
command on Router X also illustrates that Router X does have Router Y in its neighbor table for
a short time.
Summary of Troubleshooting EIGRP
The following summarizes the key points that were discussed in this section:
?– Troubleshooting EIGRP includes several aspects, such as resolving neighbor relationships,
routing table issues, and authentication problems.
?– Issues that can cause EIGRP neighbor problems include incorrect network commands and
hello packet information mismatches. Use the show ip eigrp neighbors command to help
troubleshoot these issues.
?– Missing EIGRP routes from the routing table can be because of route ?¬?ltering or automatic
summarization in discontiguous networks. Use the show ip route command to help
troubleshoot these issues.
?– The debug eigrp packets command can help you troubleshoot MD5 authentication
problems.
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