Running OSPF across Frame Relay

The various models you can use to run OSPF over partially-meshed WAN (usually Frame Relay) are complex enough to make you scream ... or switch to EIGRP :) Arden Packeer did an excellent job in his three-part tutorial describing broadcast and non-broadcast network types, point-to-multipoint network type and point-to-point links over Frame Relay.

If you still have problems with OSPF after reading all three tutorials, use point-to-point subinterfaces.