Configuring OSPF Route Control 297
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The DR priority configured with the ospf dr-priority command and the one with
the peer command have the following differences
■ The former is for actual DR election.
■ The latter is to indicate whether a neighbor has the election right or not. If you
configure the DR priority for a neighbor as 0, the local router will consider the
neighbor has no election right, and thus no hello packet is sent to this
neighbor, reducing the number of hello packets for DR/BDR election on
networks. However, if the local router is the DR or BDR, it sends hello packets
to the neighbor with priority 0 for adjacency establishment.
Configuring OSPF
Route Control
This section covers how to control OSPF routing information advertisement and
reception, and route redistribution from other protocols.
Prerequisites Before configuring this task, you have configured:
■ IP addresses for interfaces
■ OSPF basic functions
■ Corresponding filters if routing information filtering is needed.
Configuring OSPF Route
Summarization
OSPF route summarization includes:
■ Configuring route summarization between OSPF areas on an ABR
■ Configuring route summarization when redistributing routes into OSPF on an
ASBR
Follow these steps to configure route summarization between OSPF areas on an
ABR:
Follow these steps to configure route summarization when redistributing routes
into OSPF on an ASBR:
To do… Use the command… Remarks
Enter system view system-view -
Enter interface view interface interface-type
interface-number
-
Configure a router priority for
the interface
ospf dr-priority priority Optional
The default router priority is 1.
To do… Use the command… Remarks
Enter system view system-view -
Enter OSPF view ospf [ process-id | router-id
router-id ] *
-
Enter OSPF area view area area-id Required
Configure ABR route
summarization
abr-summary ip-address { mask |
mask-length } [ advertise |
not-advertise ] [ cost cost ]
Required
Available on an ABR only
Not configured by default
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