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).