Configuration Example: Single-Area OSPF

Figure 11-1 shows the network topology for the configuration that follows, which shows a single-area OSPF network configuration using the commands covered in this chapter.

Figure 11-1. Network Topology for Single-Area OSPF Configuration

Boston Router

Router>en
Router#config t
Router(config)#no ip domain-lookup	Turns off DNS queries so that spelling mistakes will not slow you down
Router(config)#hostname Boston	Sets host name
Boston(config)#line con 0
Boston(config-line)#logging sync	Commands interrupted by console messages will be appended to a new line
Boston(config-line)#exit
Boston(config)#int fa 0/0
Boston(config-if)#ip add 172.16.10.1 255.255.255.0
Boston(config-if)#no shut
Boston(config-if)#int s0/0
Boston(config-if)#ip add 172.16.20.1 255.255.255.0
Boston(config-if)#clock rate 56000	DCE cable connected to this interface
Boston(config-if)#no shut
Boston(config-if)#exit
Boston(config)#router ospf 1	Turns on OSPF process 1
Boston(config-router)#net 172.16.10.0 0.0.0.255 area 0	Any interface with address of 172.10.10.x will be part of Area 0
Boston(config-router)#net 172.16.20.0 0.0.0.255 area 0	Any interface with address of 172.16.20.x will be part of Area 0
Boston(config-router)#
Boston#copy run start

Buffalo Router

Router>en
Router#config t
Router(config)#no ip domain-lookup	Turns off DNS queries so that spelling mistakes will not slow you down
Router(config)#hostname Buffalo	Sets host name
Buffalo(config)#line con 0
Buffalo(config-line)#logging sync	Commands interrupted by console messages will be appended to a new line
Buffalo(config-line)#exit
Buffalo(config)#int fa 0/0
Buffalo(config-if)#ip add 172.16.30.1 255.255.255.0
Buffalo(config-if)#no shut
Buffalo(config-if)#int s0/0
Buffalo(config-if)#ip add 172.16.40.1 255.255.255.0
Buffalo(config-if)#clock rate 56000	DCE cable connected to this interface
Buffalo(config-if)#no shut
Buffalo(config)#int s 0/1
Buffalo(config-if)#ip add 172.16.20.2 255.255.255.0
Buffalo(config-if)#no shut
Buffalo(config-if)#exit
Buffalo(config)#router ospf 463	Turns on OSPF process 463
Buffalo(config-router)#net 172.16.0.0 0.0.255.255 area 0	Any interface with address of 172.16.x.x will be part of Area 0
Buffalo(config-router)#
Buffalo#copy run start

Bangor Router

Router>en
Router#config t
Router(config)#no ip domain-lookup	Turns off DNS queries so that spelling mistakes will not slow you down
Router(config)#hostname Buffalo	Sets host name
Bangor(config)#line con 0
Bangor(config-line)#logging sync	Commands interrupted by console messages will be appended to a new line
Bangor(config-line)#exit
Bangor(config)#int fa 0/0
Bangor(config-if)#ip add 172.16.50.1 255.255.255.0
Bangor(config-if)#no shut
Bangor(config)#int s 0/1
Bangor(config-if)#ip add 172.16.40.2 255.255.255.0
Bangor(config-if)#no shut
Bangor(config-if)#exit
Bangor(config)#router ospf 100	Turns on OSPF process 100
Bangor(config-router)#net 172.16.40.2 0.0.0.0 area 0	Interface with address of 172.16.40.2 will be part of Area 0
Bangor(config-router)#net 172.16.50.1 0.0.0.0 area 0	Interface with address of 172.16.50.1 will be part of Area 0
Bangor(config-router)#
Bangor#copy run start