3Com Switch 7750 Configuration Guide Guide

OSPF Route Control 299
n
The DR priorities configured by the ospf dr-priority command and the peer
command have different purpose:
■ The priority set with the ospf dr-priority command is used for actual DR
election.
■ 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 neighboring relationship.
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.
Configuration
Prerequisites
Before configuring OSPF route control, perform the following tasks:
■ Configuring the network layer addresses of interfaces so that the adjacent
nodes are reachable to each other at the network layer
■ Completing basic OSPF configuration
■ Configuring filter list to filter routing information
Configuring OSPF Route
Summary
The configuration of OSPF route summary includes:
■ Configuring ABR route summary,
■ Configuring ASBR route summary for imported routes.
Table 218 Configure ABR route summary
Operation Command Description
Enter system view system-view -
Enter OSPF view
ospf [ process-id [ router-id
router-id ] ]
-
Enter area view area area-id -
Enable ABR route summary
abr-summary ip-address
mask [ advertise |
not-advertise ]
Required
This command takes effect
only when it is configured on
an ABR. By default, this
function is disabled on an
ABR.
Table 219 Configure ASBR route summary
Operation Command Description
Enter system view system-view -
Enter OSPF view
ospf [ process-id [ router-id
router-id ] ]
-