en
conf t
hostname NR
router ospf 1
 router-id 1.1.1.1
 network 192.168.0.0  0.0.255.255 area 0
 passive-interface g0/0 ( not for central router)
exit

!! configure other routers yourself

do show ip route ospf
do show ip ospf neighbor
----------------------------------------------------------
in NR

int loop 0
 ip address 192.168.9.1 255.255.255.0
 ip ospf network point-to-point 
exit

!! configure loopback in West Router, East Router & South Router

do show ip route ospf