interface GigabitEthernet0/0/0
ip address 12.1.1.2 255.255.255.0
ospf enable 1 area 0.0.0.0
#
interface GigabitEthernet0/0/1
ip address 23.1.1.2 255.255.255.0
ospf enable 1 area 0.0.0.0
#
interface GigabitEthernet0/0/2
ip address 26.1.1.2 255.255.255.0
ospf enable 1 area 0.0.0.1
#
interface LoopBack0
ip address 2.2.2.2 255.255.255.255
ospf enable 1 area 0.0.0.0
#
ospf 1 router-id 2.2.2.2
area 0.0.0.0
area 0.0.0.1
stub
#
R3
interface GigabitEthernet0/0/1
ip address 23.1.1.3 255.255.255.0
ospf enable 1 area 0.0.0.0
#
interface GigabitEthernet0/0/2
ip address 34.1.1.3 255.255.255.0
ospf enable 1 area 0.0.0.2
#
interface LoopBack0
ip address 3.3.3.3 255.255.255.255
ospf enable 1 area 0.0.0.0
#
ospf 1 router-id 3.3.3.3
area 0.0.0.0
area 0.0.0.2
stub no-summary
#
R4
interface GigabitEthernet0/0/2
ip address 34.1.1.4 255.255.255.0
