R2#sh run | b router
router ospf 1
 router-id 180.40.7.98
 log-adjacency-changes
 network 2.2.2.2 0.0.0.0 area 234
 network 180.40.7.2 0.0.0.0 area 234
 network 0.0.0.0 255.255.255.255 area 0
!
R3#sh run | b router
router ospf 1
 router-id 180.40.7.129
 log-adjacency-changes
 network 180.40.7.3 0.0.0.0 area 234
 network 180.40.7.129 0.0.0.0 area 234
 network 0.0.0.0 255.255.255.255 area 0
!
R4#sh run | b router
router ospf 1
 log-adjacency-changes
 network 4.4.4.4 0.0.0.0 area 234
 network 180.40.7.130 0.0.0.0 area 234
 network 0.0.0.0 255.255.255.255 area 0
!