R2(config)#interface fastEthernet 0/0
R2(config-if)#ip ospf message-digest-key 1 md5 MYPASS
R2(config-if)#ip ospf authentication message-digest
For MD5 authentication you need different commands. First use ip ospf message-digest-key X md5 to specify the key number and a password. It doesn’t matter which key number you choose but it has to be the same on both ends. To enable OSPF authentication you need to type in ip ospf authentication message-digest.
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