This document explains common problems with getting Open
Shortest Path First (OSPF) neighbors to become fully adjacent.
In a successful formation of OSPF adjacency, OSPF neighbors will
attain the FULL neighbor state. In order to examine the
formation of adjacency, issue the debug ip ospf adj command.
Before you issue debug commands, refer to Important Information
on Debug Commands. This document requires a basic understanding
of IP routing protocols and the OSPF routing protocol. In order
to learn more about IP routing protocols, refer to Routing
Basics. Refer to the Open Shortest Path First (OSPF) Support
Page for more information about OSPF. The information in this
document is based on these software and hardware versions: OSPF
can be configured in all routers, such as the Cisco 2500 series,
the Cisco 2600 series, and Layer 3 switches. OSPF is supported
in Cisco IOS® Software Releases 10.0 and later. The information
in this document was created from the devices in a specific lab
environment. All of the devi