Jenny,
Yes, the 4500 will be the only router at the remote site. There will be a
Catalyst 5500 and there will be several intra-area vlans being routed by the
4500, I'll try summarizing those. It should be a fun project.
If things go well, there might be a couple of other sites that would be
setup similarly on this same 7513 router. More than anything, I'm trying to
explore some other features OSPF can offer instead of making everything part
of one big area 0, which has worked fine so far.
Dave H
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 28, 2001 4:54 PM
To: [EMAIL PROTECTED]
Subject: OSPF design question re: location of Area Border Router
John,
You could equally well have the 7513 with one interface in area 1 and the
rest in area 0, and the 4500 with all interfaces in area 1, in which case
the 7513 is the ABR.
David,
Am I correct in thinking that the only router at the remote site is the
4500? Or is there more 'behind it'? Because if the 4500 is the only
router, you're not gaining much by making the 4500 the ABR. Area 0 will
still include all the routers in your network, and the 4500 will still have
all the area 0 information. You can summarise your remote site routes into
area 0, but that's about it.
Are you planning on extending this idea and having lots of other areas set
up in the same way? Generally regarded as not a good idea to have 'too
many' areas defined on one router - the guidelines I saw last (quite a
while ago) suggested a maximum of three areas per router but even at the
time that was a very vague rule of thumb - they also suggested a maximum of
about 60 routers in an area which you are obviously exceeding, presumably
without problems.
Running area 0 over WAN links is not necessarily a terrible thing to do -
if your network is stable, OSPF doesn't spew out lots of traffic.
Making the 7513 the ABR is probably your best bet - it sounds like your
7513 can cope with it (check your memory usage as well, though).
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 01/03/2001
08:38 am ---------------------------
"John Neiberger" <[EMAIL PROTECTED]>@groupstudy.com on
01/03/2001 04:19:39 am
Please respond to "John Neiberger" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: OSPF design question re: location of Area Border Router
I think I must be missing something here, or I don't understand the
concept of ABR.
If you have a 7513 in area 0 connected to a 4500 in area 1, for
instance, then the 4500 will have one interface in area0 and the rest
presumably in area 1. By definition, that makes the 4500 an ABR,
doesn't it? I don't see how you have any choice in this matter at all,
but since I've never actually configured OSPF perhaps someone will
enlighten me.
>>> "Hennen, David" <[EMAIL PROTECTED]> 2/28/01 9:32:59 AM >>>
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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