R2#sh run int tu 0
Building configuration...

Current configuration : 146 bytes
!
interface Tunnel0
 ip address 24.24.24.2 255.255.255.0
 ip pim sparse-dense-mode
 tunnel source Serial1/2
 tunnel destination 180.40.7.130
end

R2#sh run | b router ospf
router ospf 1
 router-id 180.40.7.35
 log-adjacency-changes
 network 180.40.7.2 0.0.0.0 area 99
 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 99
 network 180.40.7.129 0.0.0.0 area 99
 network 0.0.0.0 255.255.255.255 area 0
!

R4#sh run int tu 0
Building configuration...

Current configuration : 150 bytes
!
interface Tunnel0
 ip address 24.24.24.4 255.255.255.0
 ip pim sparse-dense-mode
 tunnel source FastEthernet0/0
 tunnel destination 180.40.7.2
end

R4#sh run | b router
router ospf 1
 log-adjacency-changes
 network 180.40.7.130 0.0.0.0 area 99
 network 0.0.0.0 255.255.255.255 area 0
!