Troubleshooting

Step 1. If using simple password authentication, verify that the same password is being used on every interface attached to the network.

Step 2. If using MD5 authentication, verify that the same key and password are being used on every interface attached to the network.

Step 3. Mismatched keys and passwords can be found by enabling OSPF debugging. A sample session is shown in the following output where simple password authentication is used and the passwords assigned to the interfaces do not match.

rtrA#debug ip ospf adj

OSPF adjacency events debugging is on rtrA#

00:47:55: OSPF: Rev pkt from 172.16.1.2, EthernetO/O :

Mismatch Authentication Key - Clear Text

00:47:55: OSPF: Rev hello from 2.2.2.2 area 0 from SerialO/1 10.1.1.2 00:47:55: OSPF: End of hello processing

The following output is for message digest authentication when the keys match but the passwords do not.

rtrB#debug ip ospf adj

OSPF adjacency events debugging is on

00:51:37: OSPF: Rev pkt from 10.1.1.1, SerialO : Mismatch Authentication Key

Message Digest Key 1

The final debug output is for message digest authentication with a key mismatch. One interface has been configured with a key ID of 1 and the other interface has a key ID of 2.

rtrA#debug ip ospf adj

OSPF adjacency events debugging is on rtrA#

00:53:31: OSPF: Send with youngest Key 1

00:53:36: OSPF: Rev pkt from 10.1.1.2, Serial0/1 : Mismatch Authentication Key

No message digest key 2 on interfac

00:53:41: OSPF: Send with youngest Key 1

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