Command Reference Guide

3Com Router 5000 Family and Router 6000 Family abr-summary ● 7
Command Reference
abr-summary
Purpose 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.
Syntax abr-summary ip-address mask [ advertise | not-advertise ]
undo abr-summary ip-address mask
Parameters 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.
Default By default, the area border router doesn’t aggregate routes.
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
[3Com -ospf-1-area-0.0.0.1] abr-summary 36.42.0.0 255.255.0.0
View This command can be used in the following views:
■ OSPF Area view
Description 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.