Hi, Yes. If Area 0 is MD5 then virtual link must be MD5 also. Example: ROUTER 1 ! int loopback0 ip address 150.150.1.1 255.255.255.0 ip ospf network point-to-point ! router ospf 100 network 150.150.1.0 0.0.0.255 area 0 network 150.150.10.0 0.0.0.255 area 0 network 150.150.20.0 0.0.0.255 area 1 area 0 authentication message-digest area 1 virtual-link 150.150.2.2 message-digest-key 1 md5 cisco ! int s0 ip address 150.150.10.1 255.255.255.0 ip ospf message-digest-key 1 md5 cisco ! int s1 ip address 150.150.20.1 255.255.255.0 ! ROUTER 2 ! int loopback0 ip address 150.150.2.2 255.255.255.0 ip ospf network point-to-point ! router ospf 100 network 150.150.2.0 0.0.0.255 area 1 network 150.150.20.0 0.0.0.255 area 1 network 150.150.30.0 0.0.0.255 area 2 area 1 virtual-link 150.150.1.1 message-digest-key 1 md5 cisco ! int s0 ip address 150.150.20.2 255.255.255.0 ! int s1 ip address 150.150.30.1 255.255.255.0 ! Router 3 ! int loopback0 ip address 150.150.3.3 255.255.255.0 ip ospf network point-to-point ! router ospf 100 network 150.150.3.0 0.0.0.255 area 2 network 150.150.30.0 0.0.0.255 area 2 ! int s0 ip address 150.150.30.2 255.255.255.0 ! Best of luck. Danny
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