OSPF Authentication

• per-interface basis
• every ospf packet keyed with password
  

Authentication types:

• null (no authentication)(type 0)
  
• plaintext
• MD5

Authentication is enabled per interface.

Plaintext

Router(config-if)# ip ospf authentication-key 
Router(config-if)# ip ospf authentication

MD5

Router(config-if)# ip ospf message-digest-key  md5 
Router(config-if)# ip ospf authentication message-digest