The router to be configured is the 2500, an internal router within a single area. The router needs to understand how to participate in the OSPF network. Therefore, it requires the following:
• The OSPF process—The routing protocol needs to be started on the router.
• Participating router interfaces—The router may not want to have all its interfaces send or receive OSPF routing updates. A classic example is a dialup line to a remote office. If there were only one subnet at the remote office, it would be more efficient to use default and static route commands because any updates would dial the line.
• Identification of the area—The router will define which area it is in on a per-interface basis.
• A router ID—This allows the router to be identified by the other routers in the network. The ID of the router advertising a link is used to determine the next logical hop, for example, if that link is used in the path selection to a remote network.
The following two commands are required for configuring OSPF on a single internal router:
• OSPF process command
• OSPF network command
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