what does command "area x range" do?

[teru-lei]

Hi all,

The command "area x range" can be used in ospf to make the ospf routers just see the summary route specified in the command. But what does the command actually do in the router? will that command suppress the summary update (type 3 and type 4) for that area in the router? And for example, if area 4 contain 3 subnets: 11.1.1.0/24, 11.1.2.0/24 and 12.1.1.0/24, and I use command "area 4 range 11.1.0.0 255.255.0.0" in the router, so can the subnet 12.1.1.0/24 appears in other routers? Can anybody tell me? Thank You!

Best Regards

Teru Lei

[a.manosca]

The following link should help:

http://www.cisco.com/warp/customer/104/3.html#12.0

Goodluck.

[deilert]

the command you are using will summarize networks 11.1.0.0 - 11.1.0.255.

If you only want ro summarize 11.1.1.0 & 11.1.2.0 the command would be

area 4 range 11.1.0.0 255.255.252 .0

this will also summarize the 11.1.3.0 network .

If you only want to summarize 11.1.1.0. & 11.1.2.0 you need 2 summary statemens

area 4 range 11.1.0.0 255.255.254.0 (this summarizes 11.1.0.0 & 11.1.1.0 )

area 4 range 11.1.2.0 255.255.255.0