73BFDNOTE:For more information about BFD, seeHigh Availability Configuration Guide.Bidirectional forwarding detection (BFD) provides a single mechanism to quickly detect and monitor theconnectivity of links between OSPF neighbors, reducing network convergence time.Protocols and standards• RFC 1765, OSPF Database Overflow• RFC 2328, OSPF Version 2• RFC 3101, OSPF Not-So-Stubby Area (NSSA) Option• RFC 3137, OSPF Stub Router Advertisement• RFC 3630, Traffic Engineering Extensions to OSPF Version 2• RFC 4811, OSPF Out-of-Band LSDB Resynchronization• RFC 4812, OSPF Restart Signaling• RFC 4813, OSPF Link-Local SignalingOSPF configuration task listMake a proper plan before configuring OSPF.To run OSPF in a routing domain, you must first enable OSPF on the routers. Then use the default settingsof parameters such as the hello interval, LSA delay timer, and SPF calculation interval. You can alsoconfigure them as needed. OSPF routers should be configured on an area basis. Wrong configurationsmay cause communication failures, routing information blocks, and routing loops.Complete the following tasks to configure OSPF:Task RemarksEnabling OSPF RequiredConfiguring a stub areaConfiguring an NSSA areaConfiguring OSPF areasConfiguring a virtual linkOptionalConfiguring the OSPF network type for an interface asbroadcast OptionalConfiguring the OSPF network type for an interface as NBMA OptionalConfiguring the OSPF network type for an interface as P2MP OptionalConfiguring OSPFnetwork typesConfiguring the OSPF network type for an interface as P2P OptionalConfiguring OSPF route summarization OptionalConfiguring OSPF inbound route filtering OptionalConfiguring ABR Type-3 LSA filtering OptionalConfiguring OSPF routecontrolConfiguring an OSPF cost for an interface Optional
