!
hostname Router_B
!
interface Loopback0
ip address 172.16.0.1 255.255.255.0
!
interface Loopback1
ip address 172.16.1.1 255.255.255.0
!
interface Loopback2
ip address 172.17.0.1 255.255.255.0
!
interface Loopback3
ip address 172.17.1.1 255.255.255.0
!
interface FastEthernet0
ip address 10.0.0.1 255.255.255.252
speed auto
!
router ospf 1
log-adjacency-changes
network 10.0.0.0 0.0.0.3 area 0
network 172.16.0.0 0.0.0.255 area 0
network 172.16.1.0 0.0.0.255 area 0
network 172.17.0.0 0.0.0.255 area 0
network 172.17.1.0 0.0.0.255 area 0
!