From: Peter van Oene (pvo@usermail.com)
Date: Fri Oct 04 2002 - 10:16:50 GMT-3
From a scaling perspective, if your network is that large, I might
consider running a BGP backbone and subdividing the EIGRP topology. I have
done this before with good success. Indeed, a separate IGP can be used for
internal reachability among the BGP speakers which might lead to a nice
transition mechanism toward a standards based protocol in the even
that non cisco devices found a home in the network.
At 01:54 PM 10/4/2002 +0100, Copleston Daniel wrote:
>Multiple EIGRP AS's are generally considered a bad thing as they do not
>limit the query size but merely add complexity. By this I mean that the AS's
>boundaries will not help limit the size of the network as far as EIGRP is
>concerned and help reduce the occurrence of SIA routes. The Cisco policy
>seems to be to use a single AS number and bound queries through suitable use
>of summarisation wherever possible. There are some good Networkers PDFs on
>this - I will send the links when I dig them out.
>
>Thanks,
>Daniel
>
>-----Original Message-----
>From: Jaksec, Nick [mailto:Nick.Jaksec@acs-inc.com]
>Sent: 04 October 2002 13:35
>To: CCIE (E-mail)
>Subject: EIGRP Question
>
>
>Is there any need to have multiple EIGRP AS's within a rather large network?
>I can see with OSPF by creating multiple areas and then summarizing at the
>ABR, but with EIGRP you can summarize anywhere thus creating the same
>effect. What is the advantage to having multiple EIGRP AS's and
>redistributing between them within a network ?? Any response would be
>appreciated, thanks !!
>
>
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