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OSPF neighbor flaps and receives the OSPF-5-ADJCHG error message

Core Issue

The Open Shortest Path First (OSPF) neighbors are established by exchanging hello packets at multicast address  If these packets fail with any Layer 2 (L2) issue, OSPF neighbors flap. This results in the error message.


To resolve this issue, ensure that the underlying L2 between OSPF neighbors is working properly by issuing the ping command. This ensures reachability to the neighbor address.

If neighbors are on a multi-access segment, issue the ping command to address This ensures reachability to all OSPF neighbors.

For more information, refer to the Troubleshooting OSPF Neighbor States section of Troubleshooting OSPF.

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Last update:
‎06-22-2009 05:31 PM
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