RT1 (Changing the OSPF Administrative Distances)

RT1:
Conf t
!
Int eth 0/0
Ip add 192.168.12.1 255.255.255.0
No shut
!
Router ospf 100
router-id 1.1.1.1
Net 192.168.12.0 0.0.0.255 area 0
!
End