Common OSPF configuration issues

Common OSPF configuration issues
2.3.7 


This page will discuss some configuration issues that could prevent communications between OSPF routers.
An OSPF router must establish a neighbor or adjacency relationship with another OSPF router to exchange routing information. Failure to establish a neighbor relationship is caused by any of the following reasons:

• Hellos are not sent from both neighbors.
• Hello and dead interval timers are not the same.
• Interfaces are on different network types.
• Authentication passwords or keys are different.

In OSPF routing it is also important to ensure the following:

• All interfaces have the correct addresses and subnet mask.
• network area statements have the correct wildcard masks.
• network area statements put interfaces into the correct area.

The next page will discuss some show commands.

Verifying the OSPF configuration
2.3.8 


This page will explain how show commands can be used to troubleshoot OSPF.
To verify the OSPF configuration a number of show commands are available. Figure lists these commands. Figure shows commands useful for troubleshooting OSPF.
This page concludes this lesson. The next page will summarize the main points from this module.