[8153] in North American Network Operators' Group
Re: IP over ATM overhead
daemon@ATHENA.MIT.EDU (John Cavanaugh)
Thu Mar 13 11:25:31 1997
From: johnc@msc.edu (John Cavanaugh)
To: stephen@clark.net (Stephen Balbach)
Date: Thu, 13 Mar 1997 09:59:38 -0600 (CST)
Cc: nanog@merit.edu
In-Reply-To: <Pine.LNX.3.91.970313100137.21788F-100000@bisco.clark.net> from "Stephen Balbach" at Mar 13, 97 10:05:34 am
> We are installing an ATM backbone connection and wondering what level
> of overhead can be expected. ...
I wrote a paper on this subject a couple of years ago. You can find
it at
http://www.msci.magic.net/
under "Papers," the title is "Protocol Overhead in IP/ATM Networks",
or at
ftp://www.magic.net/pub/overhead.ps
The level of protocol overhead depends on the medium, the AAL, and the
size of the transmission unit. The best you'll do is to get 87% of the
raw bandwidth to the application (most of this is taken up by the lower
layers (ATM and below)), and this number can go as low as 70%.
--
John Cavanaugh EMail: johnc@msc.edu
Minnesota Supercomputer Center, Inc.
1200 Washington Ave. S Phone: +1 612 337-3556
Minneapolis, MN 55415 FAX: +1 612 337-3400
