If the remote 4500 is the ABR, then it will need to receive LSAs from area
0, removing the benefit of making the new site totally stubby. If the 7513
is the ABR, the wan link to the remote site will only need to carry a
default route rather than the routes for your 100+ node area 0.
So I would definitely make the 7513 the ABR.
Andrew Cook
----- Original Message -----
From: "Hennen, David" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, February 28, 2001 11:32 AM
Subject: OSPF design question re: location of Area Border Router
> Hi, I am preparing to bring up a new site in an ospf network. The new
site
> will be a training facility connected back to the main office by a t1.
> Currently we use OSPF and have everything in area 0, around 100 routers.
>
> I want to make this new site a different area and to make the new area a
> Totally Stubby Area. We have two 7513 routers at the main office that
> handle all the wan traffic, the new remote office would connect to one of
> these. The remote training office will have a 4500.
>
> One of my coworkers suggested that the 7513 at the main office should be
the
> Area Border Router, because we should keep area 0 from being spread out
over
> a bunch of wan links. I had it in mind that the remote 4500 should be the
> ABR. I don't have a strong reason for thinking that way. The cpu of the
> 7513 runs between 20-30 % utilization according to snmp info.
>
> Are there any rules of thumb regarding this? I looked through the Cisco
> OSPF network design book and can see some examples that support having the
> ABR at the main office. Is that the accepted practice? Are there any
> gotcha's to look out for?
>
> Thanks if you can help
> dave h
>
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