From: Charles Church (cchurch@wamnet.com)
Date: Fri May 09 2003 - 22:19:21 GMT-3
Jim,
The way I look at it, the command really serves no purpose for the exact
reasons you mentioned. A rate-limiting command like this is no replacement
for a well-designed network. So if you see a routing protocol taking more
than 10% of a link's bandwidth, you've definitely designed something wrong.
Between EIGRP's configurable hello times and summarization, there's no
reason it should never account for more than a few packets per minute.
Chuck Church
CCIE #8776, MCNE, MCSE
Wam!Net Government Services
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 585-233-2706
cchurch@wamnet.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
ccie2be
Sent: Friday, May 09, 2003 1:26 PM
To: Group Study
Subject: Eigrp bandwidth requirements
Hi all,
I'm trying to understand the true need for the Eigrp command, "ip
bandwidth-percent eigrp".
I know that, by default, Eigrp won't use more than 50 % of the bandwidth
available on the link, and I also know that Eigrp, by it's design, uses very
little bandwidth to operate - periodic Hello's and update, response, and
query
packets as needed.
So, here's the dilemma: since Eigrp doesn't need alot of bandwidth to
operate, but won't operate correctly if it doesn't have the bandwidth it
requires, what practical purpose does the above command serve?
If the percentage set with the above command is more than Eigrp needs to
operate, it's not doing anything.
If the percentage set is less than Eigrp needs, eigrp won't operate
correctly.
Now, assuming the above command does have a practical function, how can
good
percentage values to use be figured out? If it's good to limit Eigrp to 50%
of the bandwidth ( the default value), wouldn't it be better to limit Eigrp
to
40%? If so, then why not 30%?
In other words, what's the tradeoff of limiting Eigrp's bandwidth
consumption?
And, what's the criteria I should use to determine the optimum amount of
bandwidth Eigrp should be allowed to have?
Thanks in advance, Jim
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