This section
introduces some of the common issues surrounding an OSPF network and offers a ?¬‚owchart
approach to troubleshooting these issues.
Components of Troubleshooting OSPF
Troubleshooting OSPF requires an understanding of the operation of the protocol as well as a
speci?¬?c approach methodology. Figure 4-8 shows the major components of OSPF troubleshooting
and the order in which the process ?¬‚ows.
Figure 4-8 Components of Troubleshooting OSPF
The major components of OSPF troubleshooting include the following:
?– OSPF neighbor adjacencies
?– The OSPF routing table
?– OSPF authentication
Troubleshoot
OSPF Neighbor
Adjacencies
Troubleshoot
OSPF Routing
Table Issues
Troubleshoot
OSPF
Authentication
Troubleshooting OSPF 161
Troubleshooting OSPF Neighbor Adjacencies
The ?¬?rst component to troubleshoot and verify is the OSPF neighbor adjacency. Figure 4-9 shows
the veri?¬?cation/troubleshooting components for neighbor adjacencies.
Figure 4-9 Troubleshooting OSPF Neighbor Adjacencies
A healthy OSPF neighbor state is ???Full.??? If the OSPF neighbor state remains in any other state, it
may indicate a problem. Example 4-12 demonstrates sample output from the show ip ospf
neighbor command to gather this information.
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