OSPF Configuration Example

The following figure is an example of an autonomous system using OSPF (Open Shortest Path First) routers. The details of this network follow.

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OSPF Configuration Example
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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.