Configuring Simple OSPF. Configuring OSPF in a Single Area When configuring any OSPF router, you must establish which area assignment to enable the interface for. OSPF has some basic rules when it comes to area assignment. OSPF must be configured with areas. The backbone area 0, or 0.0.0.0, must be configured if you use more than one area assignment. You can configure OSPF in one area; you can choose any area, although good OSPF design dictates that you configure area 0. To enable OSPF on a Cisco router and advertise interfaces, the following tasks are required: Step 1 Use the command router ospf process ID to start OSPF. Step 2 Use the network command to enable the interfaces. Step 3 Identify area assignments. Step 4 (Optional) Assign the router ID. Example ...
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