Cisco Systems 78-11741-02 manual IPC-248

Configuring OSPF

OSPF Configuration Examples

Note It is not necessary to include definitions of all areas in an OSPF autonomous system in the configuration of all routers in the autonomous system. You must only define the directly connected areas. In the example that follows, routes in area 0 are learned by the routers in area 1 (Router A and Router B) when the ABR (Router C) injects summary LSAs into area 1.

The OSPF domain in BGP autonomous system 109 is connected to the outside world via the BGP link to the external peer at IP address 11.0.0.6. Example configurations follow.

Following is the sample configuration for the general network map shown in Figure 42.

Router A Configuration—Internal Router

interface ethernet 1

ip address 131.108.1.1 255.255.255.0

router ospf 1

network 131.108.0.0 0.0.255.255 area 1

Router B Configuration—Internal Router

interface ethernet 2

ip address 131.108.1.2 255.255.255.0

router ospf 202

network 131.108.0.0 0.0.255.255 area 1

Router C Configuration—ABR

interface ethernet 3

ip address 131.108.1.3 255.255.255.0

interface serial 0

ip address 131.108.2.3 255.255.255.0

router ospf 999

network 131.108.1.0 0.0.0.255 area 1 network 131.108.2.0 0.0.0.255 area 0

Router D Configuration—Internal Router

interface ethernet 4

ip address 10.0.0.4 255.0.0.0

interface serial 1

ip address 131.108.2.4 255.255.255.0

router ospf 50

network 131.108.2.0 0.0.0.255 area 0 network 10.0.0.0 0.255.255.255 area 0

Router E Configuration—ASBR

interface ethernet 5

ip address 10.0.0.5 255.0.0.0

interface serial 2

ip address 11.0.0.5 255.0.0.0

router ospf 65001

network 10.0.0.0 0.255.255.255 area 0 redistribute bgp 109 metric 1 metric-type 1

Cisco IOS IP Configuration Guide

IPC-248