OSPF Terminology

• DR: used only when OSPF connects to a BMA (Broadcast Multi Access) network. This reduces the number of adjacencies formed. A DR is elected to disseminate and receive routing information to/from the remaining routers on the BMA network. An example of a BMA network is Ethernet.

• BDR: is a hot standby for a DR on the BMA network. The BDR gets all routing updates from OSPF adjacent routers, but doesn’t flood LSA updates

Note: A DR and BDR are only available on BMA networks.

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