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Although OSPF packets are typically multicast, OSPF was designed to operate over a nonbroadcast technology such as Frame Relay. How OSPF is configured for Frame Relay depends on how the Frame Relay virtual circuits appear as network interfaces on the server running Routing and Remote Access. Either the Frame Relay adapter appears as a single adapter for all the virtual circuits (single adapter model) or each virtual circuit appears as a separate adapter (multiple adapter model).With the single adapter model, also known as the nonbroadcast multiple access (NBMA) model, the network for the Frame Relay service provider (also known as the Frame Relay cloud) is treated as an IP network and the endpoints on the cloud are assigned IP addresses from a designated IP network ID. To ensure that OSPF traffic is received by all of the appropriate endpoints on the cloud, you must configure the Frame Relay interface to unicast its OSPF announcements to all of the appropriate endpoints. For the server running Routing and Remote Access, this is done by designating the interface as a nonbroadcast multiple access (NBMA) network and adding OSPF neighbors. To add OSPF neighbors, see Add an OSPF neighbor. Also, in a spoke and hub Frame Relay topology, the Frame Relay interface for the hub router must have a router priority set to 1 or greater and the Frame Relay interfaces for the spoke routers must have a router priority set to 0. Otherwise, the hub router, which is the only router that can communicate with all of the spoke routers, cannot become the designated router and adjacencies cannot form across the Frame Relay network.With the multiple adapter model, each Frame Relay virtual circuit appears as a point-to-point link with its own network ID, and the endpoints are assigned IP addresses from a designated IP network ID. Since each virtual circuit is its own point-to-point connection, you can configure the interface for the point-to-point network type.