When running Open Shortest Path First Protocol (OSPF) between routers connected over a Frame Relay network, if the network is defined as a broadcast network, it is necessary to use the [broadcast] keyword in the frame-relay map commands.
This is an example of the frame-relay map command with the [broadcast] keyword:
interface Serial0.2 multipoint
!-- The subinterface is treated as a multipoint link.
ip address 126.96.36.199 255.255.255.0
ip ospf network broadcast
!-- This command is used to define the network type as broadcast. The network type is
!-- defined on nonbroadcast networks to avoid configuring the neighbors explictly.
frame-relay map ip 188.8.131.52 16 broadcast
Issue the frame-relay map command with the [broadcast] keyword along with the ip ospf network command.