R1#sh run | b router
router ospf 1
 router-id 0.0.0.1
 log-adjacency-changes
 area 200 virtual-link 0.0.0.3
 redistribute connected subnets tag 1
 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 0.0.0.2
 log-adjacency-changes
 area 200 virtual-link 0.0.0.3
 redistribute connected subnets tag 2
 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 0.0.0.3
 log-adjacency-changes
 area 200 virtual-link 0.0.0.2
 area 200 virtual-link 0.0.0.1
 redistribute connected subnets tag 3
 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 208.28.1.3
 neighbor 208.28.1.1
!

R4#sh run | b Lo
interface Loopback0
 ip address 200.1.0.1 255.255.255.0
!
router ospf 1
 router-id 0.0.0.4
 log-adjacency-changes
 network 17.80.1.2 0.0.0.0 area 51
 network 200.1.0.1 0.0.0.0 area 51
!


S5#sh run | b router
router ospf 1
 router-id 0.0.0.5
 log-adjacency-changes
 redistribute rip subnets
 network 208.28.1.65 0.0.0.0 area 51
 network 208.28.1.130 0.0.0.0 area 51
!
router rip
 version 2
 redistribute ospf 1 metric 3
 network 217.57.100.0
 no auto-summary
!


S6#sh run | b router
router rip
 version 2
 redistribute connected
 network 217.57.100.0
 no auto-summary
!