Enabling and Configuring OSPF
The first step toward running any routing protocol on a network is enabling the routing protocol. OSPF requires a process-ID, which uniquely identifies the OSPF process for the router. A single router can use multiple OSPF processes. The concept of process-ID is different in OSPF than the concept of the autonomous system in Enhanced IGRP or BGP. In OSPF, the process-ID is local to the box and is not carried in routing protocol packets.
To enable OSPF in the global configuration mode, you must define the networks on which OSPF will be enabled. Finally, you must assign those networks to their specific areas. A single interface can belong to a single area only; if the interface is configured with a secondary address, ...
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