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Cisco OSPF Command and Configuration Handbook by William R. Parkhurst - Ph.D., CCIE #2969

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Chapter 19. Interface Configuration Commands

ip ospf authentication

 

ip ospf authentication authentication-key password

 

ip ospf authentication message-digest

Command 19-3 requires the use of command 19-11 (ip ospf message-digest-key key-id md5 password).

ip ospf authentication null

Syntax Description:

  • key-id—Key used to identify the password. Range of values is 1 to 255. Both ends of a link must use the same key and password.

  • password—Password to be used for authentication in the selected area on the selected interface. The password is an alphanumeric string from 1 to 8 characters.

Purpose: In IOS versions before 12.0, if authentication was enabled for an OSPF area, then all interfaces in the area had to be configured with the same authentication ...

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