Set the interface with RIPv2 MD5 authentication.
Set the interface with RIPv2 simple password authentication.
RIP version 2 has simple text authentication. This command sets authentication string. The string must be shorter than 16 characters.
Specifiy Keyed MD5 chain.
! key chain test key 1 key-string test ! interface eth1 ip rip authentication mode md5 ip rip authentication key-chain test !