3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring OSPF Route Control 327
■ The former is for actual DR election.
■ The latter is to indicate whether a neighbor has 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, 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 will send a hello packet to the
neighbor with priority 0 for adjacency relationship establishment.
Configuring OSPF
Route Control
This section is to configure control of OSPF routing information advertisement and
reception, and route redistribution from other protocols.
Prerequisites To configure 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:
■ Configure route summarization between OSPF areas on an ABR
■ Configure route summarization when redistributing routes into OSPF on an
ASBR
To configure route summarization between OSPF areas on an ABR, use the
following commands:
To configure route summarization when redistributing routes into OSPF on an
ASBR, use the following commands:
To do... Use the command... Remarks
Enter system view system-view -
Enter OSPF view ospf [ process-id | router-id
router-id | vpn-instance
instance-name ] *
-
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
To do... Use the command... Remarks
Enter system view system-view -
Enter OSPF view ospf [ process-id | router-id
router-id | vpn-instance
instance-name ]*
-
Configure ASBR route
summarization
asbr-summary ip-address {
mask | mask-length } [ tag tag
| not-advertise | cost cost ] *
Required
Available on an ASBR only
Not configured by default