en
conf t
hostname R1
router ospf 1
 router-id 1.1.1.1
 network 192.168.0.0 0.0.255.255 area 0
 passive-interface g0/0
exit

!! copy paste(right click) commands in R2 and R3 (change the hostname and R.ID before you paste in R2 and R3)

do show ip ospf neighbor
do show ip route ospf