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3.3 | |
Troubleshooting Routing Protocols | |
| 3.3.5 | |
Troubleshooting OSPF configuration |
| Open Shortest Path First (OSPF) is a link-state protocol. A link is an
interface on a router. The state of the link is a description of that
interface and of its relationship to its neighboring routers. For
example, a description of the interface would include the IP address,
the mask, the type of network to which it is connected, the routers
connected to that network, and so on. This information forms a link-state database. The majority of problems encountered with OSPF relate to the formation
of adjacencies and the synchronization of the link-state databases. The
show ip ospf neighbor command is useful for
troubleshooting adjacency formation. OSPF configuration commands are
shown in Figure
Use the debug ip ospf events privileged EXEC command to display the following information about OSPF-related events:
If a router configured for OSPF routing is not seeing an OSPF neighbor on an attached network, perform the following tasks:
To display information about each Open Shortest Path First (OSPF) packet received, use the debug ip ospf packet privileged EXEC command. The no form of this command disables debugging output. The debug ip ospf packet command produces one set of information for each packet received. The output varies slightly, depending on which authentication is used.
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