0.0.0
192.168.1.0
Routing Information Sources:
Gateway Distance Last Update
(this router) 90 00:01:08
10.140.1.1 90 00:01:08
Distance: internal 90 external 170
Troubleshooting EIGRP 195
Example 5-12, no peers currently exist on the FastEthernet 0/0 interface, and one peer exists on
the Serial 0/0/0 interface.
EIGRP routers create a neighbor relationship by exchanging hello packets. Certain ?¬?elds in the
hello packets must match before an EIGRP neighbor relationship is established:
?– EIGRP autonomous system (AS) number
?– EIGRP K values
You can use the debug eigrp packets command to troubleshoot when hello packet information
does not match. In Example 5-13, a K value mismatch exists.
Troubleshooting EIGRP Routing Tables
If the neighbor relationships are established, routes can be exchanged. If they are not being
exchanged, the next step is to troubleshoot EIGRP routing table issues. Figure 5-10 shows the
steps involved in troubleshooting these problems.
Example 5-12 Con?¬?rming EIGRP Status and Neighbors on an Interface
RouterX# sshhooww iipp eeiiggrrpp iinntteerrffaacceess
IP-EIGRP interfaces for process 100
Xmit Queue Mean Pacing Time Multicast Pending
Int Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Fa0/0 0 0/0 0 0/1 0 0
Se0/0/0 1 0/0 38 10/380 552 0
NOTE EIGRP K values are used in the EIGRP best-path selection process and are discussed
in the Cisco CCNP curriculum.
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