From: malcolm.price@lanbase.com
Date: Mon Jul 12 2004 - 05:51:10 GMT-3
Akbar,
Address ranges are used to aggregate address ranges from within the area
into one single advertisement sent into the adjacent areas, or to prevent
the advertisement of networks.
The not-advertise option, hides these networks from other areas.
For example. Consider the following. You have an ABR router bordering area
1 and area 0. It receives the networks 10.1.1.0 /24, 10.1.2.0/24,
10.1.3.0/24 up to 10.1.254.0 etc from other area 1 routers.
On the ABR you implement the area range command i.e. area 1 range 10.1.0.0
255.255.0.0. Effect: This will aggregate address ranges from within the
area into one single advertisement sent into the adjacent areas i.e.
10.1.0.0 /16.
However, using the not-advertise parameter would hide these networks and
the summary from other areas.
In summary, Use the area area-id range address mask command create an
address range.
Use the area area-id range address mask not-advertise command to create an
address range and prevent the range from being advertised to other networks.
That's my understanding from implementing it numerous times :).
Hope that helps,
Malcolm
CCIE #10607
www.lanbase.com
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
akbar khan
Sent: 11 July 2004 22:06
To: ciscokhan@hotmail.com; ccielab@groupstudy.com;
security@groupstudy.com
Subject: RE: area range x.x.x not-advertise...
Group, Your input please...!
>From: "akbar khan" <ciscokhan@hotmail.com> >Reply-To: "akbar khan"
<ciscokhan@hotmail.com> >To: ccielab@groupstudy.com,
security@groupstudy.com >Subject: area range x.x.x not-advertise...
>Date: Sat, 10 Jul 2004 18:51:14 +0000
Hello Folks,
I wish to confirm my understanding of area 1 range x.x.x.x
>no-advertise command. Iam in the impression that in addition to not
>advertising the type 3 summary-route this command will also hide the
>specific routes of area 1 to other areas.. is that true...?
In addition is the above command in parallel with area 1 filter-list
prefix exception to that filter-list is more flexible than no-advertise
option
Thanks,Akbar khan
>
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