R1#sh run | b router
router ospf 1
 router-id 1.1.1.1
 ignore lsa mospf
 log-adjacency-changes
 auto-cost reference-bandwidth 10000
 area 0 authentication message-digest
 area 51 nssa no-summary
 area 51 default-cost 999
 area 200 virtual-link 3.3.3.3 authentication-key yomomma
 redistribute connected subnets
 network 180.40.7.66 0.0.0.0 area 0
 network 208.28.1.1 0.0.0.0 area 200
 network 208.28.1.66 0.0.0.0 area 51
!

R2#sh run | b router
router ospf 1
 router-id 2.2.2.2
 ignore lsa mospf
 log-adjacency-changes
 auto-cost reference-bandwidth 10000
 area 0 authentication message-digest
 area 51 nssa no-summary
 area 200 virtual-link 3.3.3.3 authentication-key yomomma
 redistribute connected subnets
 network 180.40.7.2 0.0.0.0 area 200
 network 180.40.7.65 0.0.0.0 area 0
 network 208.28.1.3 0.0.0.0 area 200
 network 208.28.1.129 0.0.0.0 area 51
!


R3#sh run | b router

router ospf 1
 router-id 3.3.3.3
 ignore lsa mospf
 log-adjacency-changes
 auto-cost reference-bandwidth 10000
 area 0 authentication message-digest
 area 200 virtual-link 2.2.2.2 authentication-key yomomma
 area 200 virtual-link 1.1.1.1 authentication-key yomomma
 redistribute connected subnets
 network 17.80.1.1 0.0.0.0 area 51
 network 180.40.7.3 0.0.0.0 area 200
 network 208.28.1.2 0.0.0.0 area 200
 neighbor 208.28.1.1
 neighbor 208.28.1.3
!