Troubleshoot OSPF Neighbor States
Refer to OSPF Neighbor States for neighbor state descriptions.
Troubleshoot the OSPF Routing Table
Troubleshoot OSPF Init State
Refer to Why Does the show ip ospf neighbor Command Reveal Neighbors in the Init State? for an Init State problem description and troubleshooting steps.
Troubleshoot OSPF MTU
Note: If the problem is related to Layer 2, check if a proxy ARP is enabled. If it is enabled, disable it, and use the clear ip arpcommand in order to clear the ARP cache.
Troubleshoot OSPF Corrupt Packets
Troubleshoot OSPF Two-Way State
Refer to Why Does the show ip ospf neighbor Command Reveal Neighbors Stuck in 2-Way State? for an OSPF Two-way State problem description and troubleshooting steps.
Troubleshoot OSPF Links
You can use an Embedded Event Manager (EEM) script to troubleshoot the links flapping.
For more information, refer to this Cisco Support Community document that describes how to use an EEM script in order to collect information from a router when there is an OSPF flap: Troubleshooting OSPF Flaps with EEM Script 
Troubleshoot Full Adjacency
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