NBMA Overview
NBMA networks e.g. Frame Relay and ATM, give OSPF a special challenge.
BMA networks use an election process to select a BR and BDR to represent all OSPF routers on a network.
On NBMA networks, no assurance is given that all connecting devices are getting Hello packets, or are participating in the DR/BDR election.
Because of the difficulty in configuring OSPF on NBMA networks, it’s important to know which configuration/environment is most effective.