Implement Routing Update Authentication on OSPF
MD5 authentication for OSPF requires configuration at either the interface level, that is, for each interface in which OSPF will be used, or within the router OSPF process itself.
The authentication type must be the same for all routers and access servers in an area. The authentication password for all OSPF routers on a network must be the same if they are to communicate with each other via OSPF. Use the ip ospf authentication-key interface command to specify this password.
If you enable MD5 authentication with the message-digest keyword, you must configure a password with the ip ospf message-digest-key interface command.
To remove the authentication specification for an area, use the no form of ...
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