Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide
Chapter 3 OSPF Configuration Commands
3Com Corporation
3-1
Chapter 3 OSPF Configuration Commands
3.1 OSPF Configuration Commands
3.1.1 abr-summary
Syntax
abr-summary ip-address mask [ advertise | not-advertise ]
undo abr-summary ip-address mask
View
OSPF area view
Parameter
ip-address: Network segment address.
mask: Network mask.
Advertise: Advertises only the summarized route.
Notadvertise: Suppresses the advertisement of the routes in the matched range.
Description
Use the abr-summary command to configure the route aggregation on the area border
router (ABR).
Use the undo abr-summary command to cancel the function of route aggregation on
the area border router.
By default, the area border router doesn’t aggregate routes.
This command is applicable only to the ABR and is used for the route aggregation in an
area. The ABR only transmits an aggregated route to other areas. Route aggregation
refers to that the routing information is processed in the ABR and for each network
segment configured with route aggregation, there is only one route transmitted to other
areas. An area can configure multiple aggregation network segments. Thus OSPF can
aggregate various network segments together.
Example
# Aggregate the routes in the two network segments, 36.42.10.0 and 36.42.110.0, of
OSPF area 1 into one route 36.42.0.0 and transmit it to other areas.
[3Com -ospf-1] area 1
[3Com -ospf-1-area-0.0.0.1] network 36.42.10.0 0.0.0.255
[3Com -ospf-1-area-0.0.0.1] network 36.42.110.0 0.0.0.255