4.4 OSPF Over Non-Broadcast Networks
4.4.2 Configuring OSPF for nonbroadcast networks
Because there might be many routers attached to an OSPF network, a Designated Router is selected for the network. You must use special configuration parameters in the Designated Router selection if the broadcast capability is not configured.

These parameters need only be configured in the devices that are eligible to become the Designated Router (DR) or Backup Designated Router (BDR).

Note: Any device running OSPF is eligible to become the DR or BDR unless its priority value is set to zero.

To configure routers that connect to non-broadcast networks, you can specify the following neighbor parameters, as required:

  • Priority value for a neighboring router
  • Non-broadcast poll interval
  • Interface (via IP Address) through which the neighbor is reachable

These features enable you to determine several OSPF operating variables in just one router that will be propagated to its neighbors that are identified in the configuration commands shown in the figures to the left. (see command outputs for Router Tokyo and Router Melbourne).