4-21Task RemarksMaking External Route Selection Rules Defined in RFC 1583Compatible OptionalLogging Neighbor State Changes OptionalConfiguring OSPF Network Management OptionalEnabling Message Logging OptionalEnabling the Advertisement and Reception of Opaque LSAs OptionalConfiguring OSPF to Give Priority to Receiving andProcessing Hello Packets OptionalConfiguring the LSU Transmit Rate OptionalConfiguring OSPF FRR OptionalConfiguring the OSPF GR Restarter OptionalConfiguring the OSPF GR Helper OptionalConfiguring OSPFGraceful RestartTriggering OSPF Graceful Restart OptionalConfiguring BFD for OSPF OptionalEnabling OSPFYou need to enable OSPF before you can perform other OSPF configuration tasks.PrerequisitesBefore configuring OSPF, you have configured the link layer protocol, and IP addresses for interfaces,making neighboring nodes accessible with each other at the network layer.Configuration ProcedureTo enable OSPF on a router, you need to create an OSPF process and specify areas with which theprocess is associated, and the network segments contained in each area. If an interface’s IP addressresides on a network segment of an area, the interface belongs to the area and is enabled with OSPF,and OSPF advertises the direct route of the interface.To run OSPF, a router must have a Router ID, which is the unique identifier of the router in the AS.z You can specify a Router ID when creating the OSPF process. Any two routers in an AS musthave different Router IDs. In practice, the ID of a router is the IP address of one of its interfaces.z If you specify no Router ID when creating the OSPF process, the global Router ID will be used.For details about global Router ID, see IP Routing Basics Configuration in the Layer 3 - IP RoutingConfiguration Guide. You are recommended to specify a Router ID when creating the OSPFprocess.
