H3C Technologies H3C S3600 Series Switches - Manual (Page 343)

4-16
z P2MP ( required only when the interface sends packets in the unicast mode)
Since the neighbor routers cannot be discovered by broadcasting Hello packets, you must manually
specify the IP address of the neighbor router. For an NBMA network, you can determine whether the
neighbor has the DR election right.
Follow these steps to configure NBMA/P2MP neighbor:
To do... Use the command... Remarks
Enter system view system-view —
Enter OSPF view
ospf [ process-id [ router-id
router-id ] ]
Required
Configure an NBMA/P2MP
neighbor peer ip-address [ dr-priority
dr-priority ]
Required
By default, the priority for the
neighbor of an NBMA interface
is 1.
Configuring the DR Priority on an OSPF Interface
You can control the DR/BDR election on a broadcast or NBMA network by configuring the DR priorities
of interfaces.
Follow these steps to configure the DR priority on an OSPF interface:
To do... Use the command... Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Configure the DR priority on the
OSPF interface
ospf dr-priority priority
Optional
1 by default
The DR priorities configured by the ospf dr-priority command and the peer command have different
purposes:
z The priority set with the ospf dr-priority command is used for actual DR election.
z The priority set with the peer command is used to indicate if a neighbor has the right to vote. If you
specify the priority to 0 when configuring a neighbor, the local router will believe that the neighbor
has no right to vote and sends no Hello packet to it. This configuration can reduce the number of
Hello packets on the network during the election of DR and BDR. However, if the local router is
already a DR or BDR, it will send Hello packets to the neighbor whose DR priority is 0 to establish
the adjacencies.
OSPF Route Control
Perform the following configurations to control the advertisement and reception of the routing
information discovered by OSPF and import routing information discovered by other protocols.