R2#sh run | b interface Tun
interface Tunnel0
 ip address 24.24.24.2 255.255.255.0
 ip pim sparse-dense-mode
 tunnel source 2.2.2.2
 tunnel destination 4.4.4.4
!

router ospf 1
 router-id 180.40.7.98
 log-adjacency-changes
 network 2.2.2.2 0.0.0.0 area 51
 network 180.40.7.2 0.0.0.0 area 51
 network 180.40.7.35 0.0.0.0 area 51
 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 0.0.0.0 255.255.255.255 area 51
!


R4#Sh run | b interface Tun
interface Tunnel0
 ip address 24.24.24.4 255.255.255.0
 ip pim sparse-dense-mode
 ip igmp join-group 224.44.44.44
 tunnel source Loopback0
 tunnel destination 2.2.2.2
!
!
router ospf 1
 log-adjacency-changes
 network 4.4.4.4 0.0.0.0 area 51
 network 180.40.7.130 0.0.0.0 area 51
 network 0.0.0.0 255.255.255.255 area 0
!