We can't configure virtual-link authentication md5 for OSPFv2.
[ protocols ospf area 10 virtual-link 10.0.7.128 authentication md5 ] % Command incomplete: no area 10 virtual-link 10.0.7.128 authentication-key [[protocols ospf]] failed Commit failed
Reproducing
set protocols ospf area 0 authentication 'md5' set protocols ospf area 0 network '100.64.0.160/27' set protocols ospf area 10 authentication 'md5' set protocols ospf area 10 network '10.0.8.0/28' set protocols ospf area 10 virtual-link 10.0.7.128 authentication md5 key-id 1 md5-key 'xxxxxxxxxxxxxxxx'