Broadcast

Broadcast
The default Hello interval for a broadcast network is 10 seconds and the Dead interval is four
times the Hello interval, or 40 seconds. A broadcast network will elect a DR and BDR. In
order to achieve a broadcast implementation of OSPF on an NBMA network, a full mesh
must exist among the routers. Figure 5.4 depicts what the NBMA network would have to look
like. You can see that each router has a permanent virtual circuit (PVC) configured with all
of the other routers.