OSPF Configuration Example

The following figure is an example of an autonomous system using OSPF routers. The details of this network follow.

OSPF Configuration Example

Area 0 is the backbone area. It is located at the headquarters and has the following characteristics:

• Two internal routers (IR1 and IR2)
• Two area border routers (ABR 1 and ABR 2)
• Network number 10.0.x.x
• Two identified VLANs (HQ_10_0_2 and HQ_10_0_3)

Area 5 is connected to the backbone area by way of ABR 1 and ABR 2. It is located in Chicago and has the following characteristics:

• Network number 160.26.x.x
• One identified VLAN (Chi_160_26_26)
• Two internal routers

Area 6 is a stub area connected to the backbone by way of ABR 1. It is located in Los Angeles and has the following characteristics:

• Network number 161.48.x.x
• One identified VLAN (LA_161_48_2)
• Three internal routers
• Uses default routes for inter-area routing

The following section provides two router configurations for the example shown in the above figure.