conf t
!
hostname R2
!
int lo 0
 ipv4 add 2.2.2.2/32
!
int gi0/0/0/0
 ipv4 add 192.168.12.2/24
 no sh
!
int gi0/0/0/1
 ipv4 add 192.168.23.2/24
 no sh
!
router ospf 1
 area 0
  int lo 0
   passive 
  !
  int gi0/0/0/0
   net point-to-point
  !
  int gi0/0/0/1
   net point-to-point
  !
 !
!