However, this scalability introduces complexity in design, con?¬?guration, and maintenance. This
section introduces some of the common issues surrounding an EIGRP network and a ?¬‚owchart
approach to troubleshooting these issues.
Components of Troubleshooting EIGRP
When troubleshooting any network protocol, it is important to follow a de?¬?ned ?¬‚ow or
methodology. The main aspect of troubleshooting routing protocols involves ensuring that
communication exists between the routers. The following sections describe the basic components
of troubleshooting a network that is running EIGRP. Figure 5-8 shows an example of the ?¬‚ow used
for diagnosing EIGRP problems.
Figure 5-8 EIGRP Troubleshooting
The major components of EIGRP troubleshooting include the following items:
?– EIGRP neighbor relationships
?– EIGRP routes in the routing table
?– EIGRP authentication
Troubleshooting EIGRP Neighbor Relationships
The ?¬?rst step in the ?¬‚ow is to troubleshoot neighbor relationships. Figure 5-9 shows the steps for
troubleshooting these issues.
Troubleshoot
EIGRP Neighbor
Relationships
Troubleshoot
EIGRP Routing
Table Issues
Troubleshoot
EIGRP
Authentication
Troubleshooting EIGRP 193
Figure 5-9 Troubleshooting EIGRP Neighbor Issues
Example 5-9 shows output from the show ip eigrp neighbors command, which indicates that a
successful neighbor relationship exists with two routers.
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