R0:interface Loopback0
ip address 1.0.0.1 255.255.255.0
!
interface Serial0/0
ip address 192.168.1.2 255.255.255.0
no fair-queue
serial restart-delay 0
clock rate 64000
!
interface Serial0/1
ip address 192.168.3.1 255.255.255.0
serial restart-delay 0
clock rate 64000
router-id 1.0.0.1
log-adjacency-changes
area 2 virtual-link 3.3.3.3
network 192.168.1.0 0.0.0.255 area 0
network 192.168.3.0 0.0.0.255 area 1
ip address 1.1.1.1 255.255.255.0
ip ospf network point-to-point
!
interface Serial0/0
ip address 192.168.2.2 255.255.255.0
no fair-queue
serial restart-delay 0
clock rate 64000
log-adjacency-changes
network 192.168.2.0 0.0.0.255 area 0
ip address 2.2.2.2 255.255.255.0
!
interface Serial0/0
ip address 192.168.1.1 255.255.255.0
serial restart-delay 0
!
interface Serial0/1
ip address 192.168.2.1 255.255.255.0
serial restart-delay 0
log-adjacency-changes
network 192.168.1.0 0.0.0.255 area 0
network 192.168.2.0 0.0.0.255 area 0
ip address 3.3.3.3 255.255.255.0
!
interface Serial0/0
ip address 192.168.3.2 255.255.255.0
no fair-queue
serial restart-delay 0
!
interface Serial0/1
ip address 192.168.4.1 255.255.255.0
serial restart-delay 0
router-id 3.3.3.3
log-adjacency-changes
area 2 virtual-link 1.0.0.1
network 3.3.3.0 0.0.0.255 area 2
network 192.168.3.0 0.0.0.255 area 1
network 192.168.4.0 0.0.0.255 area 2