[mrtg] Re: Cisco Buffer Hits OID

dan.schlitt at smarts.com dan.schlitt at smarts.com
Wed Apr 11 17:39:57 MEST 2001

The rule of thumb that I got from a very experienced network engineer was
that when the hourly average traffic reached 50% users would begin to
experience noticiable delays in interactive use. This was for a 56kbps
connection. This agreed with our experience. I was told that on a T1 the
threshold was a bit higher.

This was all in the absense of fancy stuff like priority queuing and the



Dan Schlitt                       System Management Arts	
dan at smarts.com                    1 North Lexington Avenue
tel: (914)948-6200 x 7210         White Plains, New York 10601
fax: (914)948-6270

On Tue, 10 Apr 2001, Jonathan Ford wrote:

> I remember hearing 40% quoted in a Networking Essentials course I took once.
> Can't seem to find any proof of it anywhere though.
> Thanks for your reply,
> Jon
> ----- Original Message -----
> From: "Patrick Bartkus" <patrckb at hotmail.com>
> To: <jwf_100 at hotmail.com>; <mrtg at list.ee.ethz.ch>
> Sent: Tuesday, April 10, 2001 8:10 AM
> Subject: Re: [mrtg] Re: Cisco Buffer Hits OID
> > Jonathan,
> >
> > I think I heard tje 50% rule-of-thumb originally at a Network General (now
> Sniffer Technologies) sniffer class. It sounds good and it makes logical
> sense. If the "average" utilization is 50% that means that there are
> probably packets that get stuck waiting in line to go down the pike
> (buffered in a queue). For applications that are delay-sensitive, queued
> packets are a BAD THING.
> >
> > Other than that, I cannot provide a published source of that figure.
> >
> > Sorry,
> > Patrick
> > ---
> > Patrick Bartkus, CCNP Certified Sr. Network Support Analyst
> > Fleet Mortgage Group     Columbia, SC
> > If truth was not absolute, how could there be justice?
> >

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