Corrections appreciated.
Type 0 : No authentication. This is the default type.
123 R0(config-if)#ip ospf authentication null-----R0(config-router)#area 1 virtual-link 2.2.2.2 authentication null
Type 1 : Clear text authentication
1234567 -----R0(config-if)#ip ospf authentication- or -R0(config-router)#area 1 authenticationR0(config-if)#ip ospf authentication-key MYKEY <a href="http://www.live2naked.com/">live sex online</a>-----R0(config-router)#area 1 virtual-link 2.2.2.2 authentication-key MYKEY
Type 2 : MD5 authentication
1234567 -----R0(config-if)#ip ospf authentication message-digest- or -R0(config-router)#area 1 authentication message-digestR0(config-if)#ip ospf message-digest-key 1 md5 MYKEY-----R0(config-router)#area 1 virtual-link 2.2.2.2 authentication message-digest message-digest-key 1 md5 MYKEY
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