168.1.0/24, 1 successors, FD is 40640000
via 10.23.23.2 (40640000/128256), Serial0/0/1
P 10.140.2.0/24, 2 successors, FD is 41024000
via 10.23.23.2 (41024000/40512000), Serial0/0/1
via 10.140.1.1 (41024000/40512000), Serial0/0/0
P 10.140.1.0/24, 1 successors, FD is 40512000
via Connected, Serial0/0/0
P 172.16.31.0/24, 1 successors, FD is 40640000
NOTE Filtering routing information is covered in the CCNP course materials.
198 Chapter 5: Implementing EIGRP
By default, EIGRP is classful and performs automatic network summarization. Automatic
network summarization causes connectivity issues in discontiguous networks. The show ip
protocols command con?¬?rms whether automatic network summarization is in effect.
In the sample output in Example 5-16, no ?¬?lter lists are applied to EIGRP AS 100, and automatic
network summarization is in effect.
Troubleshooting EIGRP Authentication
The last step in the ?¬‚owchart in Figure 5-8 is to troubleshoot EIGRP authentication problems, if
con?¬?gured. This is accomplished by verifying that EIGRP authentication is successful.
Example: Successful MD5 Authentication
The output of the debug eigrp packets command on Router X, shown in Example 5-17, illustrates
that Router X is receiving EIGRP packets with MD5 authentication and a key ID equal to 1 from
Router Y.
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