Multi-Area OSPF Configuration

ASBR Router
==========

Router>enable
Router#configure terminal
Router(config)#hostname ASBR

ASBR(config)#interface looback 0
ASBR(config-if)#ip address 192.168.1.1 255.255.255.255
ASBR(config-if)#description Router ID
ASBR(config-if)#exit

ASBR(config)#interface fastethernet 0/0
ASBR(config-if)#ip address 172.16.1.1 255.255.255.0
ASBR(config-if)#no shutdown

ASBR(config-if)#interface fastethernet 0/1
ASBR(config-if)#ip address 10.1.0.1 255.255.255.0
ASBR(config-if)#no keepalive
ASBR(config-if)#no shutdown
ASBR(config-if)#exit

ASBR(config)#ip route 0.0.0.0 0.0.0.0 10.1.0.2 fa0/1
ASBR(config)#ip route 11.0.0.0 0.0.0.0 null0
ASBR(config)#ip route 12.0.0.0 0.0.0.0 null0
ASBR(config)#ip route 13.0.0.0 0.0.0.0 null0

ASBR(config)#router ospf 1
ASBR(config-router)#network 172.16.1.0 0.0.0.255 area 0
ASBR(config-router)#default-information originate
ASBR(config-router)#redistribute static

ABR-1 Router
===========

Router>enable
Router#configure terminal
Router(config)#hostname ABR-1

ABR-1(config)#interface loopback 0
ABR-1(config-if)#ip address 192.168.2.1 255.255.255.255
ABR-1(config-if)#description Router ID
ABR-1(config-if)#exit

ABR-1(config)#interface fastethernet 0/1
ABR-1(config-if)#ip address 172.16.1.2 255.255.255.0
ABR-1(config-if)#ip ospf priority 200
ABR-1(config-if)#no shutdown
ABR-1(config-if)#exit

ABR-1(config)#interface fastethernet 0/0
ABR-1(config-if)#ip address 172.16.51.1 255.255.255.0
ABR-1(config-if)#no shutdown
ABR-1(config-if)#exit

ABR-1(config)#router ospf 1
ABR-1(config-router)#network 172.16.1.0 0.0.0.255 area 0
ABR-1(config-router)#network 172.16.51.0 0.0.0.255 area 51
ABR-1(config-router)#exit
ABR-1(config)#

ABR-2 Router
===========

Router>enable
Router#configure terminal
Router(config)#hostname ABR-2

ABR-2(config)#interface loopback 0
ABR-2(config-if)#ip address 192.168.3.1 255.255.255.255
ABR-2(config-if)#description Router ID
ABR-2(config-if)#exit

ABR-2(config)#interface fastehternet 0/0
ABR-2(config-if)#ip address 192.168.1.3 255.255.255.0
ABR-2(config-if)#ip ospf priority 100
ABR-2(config-if)#no shutdown
ABR-2(config-if)#exit

ABR-2(config-if)#interface serial 0/0/1
ABR-2(config-if)#ip address 172.16.10.5 255.255.255.252
ABR-2(config-if)#clock rate 56000
ABR-2(config-if)#no shutdown
ABR-2(config-if)#exit

ABR-2(config)#router ospf 1
ABR-2(config)#network 172.16.1.0 0.0.0.255 area 0
ABR-2(config)#network 172.16.10.4 0.0.0.3 area 1
ABR-2(config)#exit

Internal Router
============

Router>enable
Router#configure terminal
Router(config)#hostname Internal

Router(config)#interface loopback 0
Router(config-if)#ip address 192.168.4.1 255.255.255.255
Router(config-if)#Description Router ID
Router(config)#exit

Router(config)#interface fastethernet 0/0
Router(config-if)#ip address 172.16.20.1 255.255.255.0
Router(config-if)#no shutdown

Router(config-if)#interface serial 0/0/0
Router(config-if)#ip address 172.16.10.6 255.255.255.252
Router(config-if)#no shutdown
Router(config-if)#exit

Router(config)#router ospf 1
Router(config-router)# network 172.16.0.0 0.0.255.255 area 0
Router(config-router)#exit
Router(config)#