[38357] in North American Network Operators' Group
Re: 95th Percentile != Lame
daemon@ATHENA.MIT.EDU (David Klindt)
Sun Jun 3 23:40:07 2001
Date: Sun, 3 Jun 2001 20:41:03 -0700 (PDT)
From: David Klindt <dklindt@cobra.ordata.com>
To: "Richard A. Steenbergen" <ras@e-gerbil.net>
Cc: James Thomason <james@divide.org>, nanog@merit.edu
In-Reply-To: <Pine.BSF.4.21.0106032244240.29677-100000@overlord.e-gerbil.net>
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On Sun, 3 Jun 2001, Richard A. Steenbergen wrote:
> On Sun, Jun 03, 2001 at 07:42:13PM -0700, David Klindt wrote:
> >
> > > I still fail to see how "peak bits" or "bursted bits" are more
> > > expensive than "regular bits". A 100Mbit FE port costs whatever it
> > > costs, and does not fluctuate with usage. This is true of almost all
> > > of your links within the network - excluding those where you have
> > > negotiated usage-based billing. An OC3, point to point, costs as much
> > > as it costs irrelevant of its usage. Therefore, every bit that
> > > crosses this circuit has a cost.
> > >
> > > Why not simply pass this cost on to the customer bit for bit?
> >
> > It is NOT that the each bit has the same cost - it is the cost of
> > maintaining enough EXTRA bandwidth so that the downstreams do not
> > bounce up against the ceiling. That amount is basically covered by
> > using the 95 rule.
>
> But peak vs non-peak has little to do with 95th percentile.
Sure they do. I sell bandwidth. I either place a limit on each port, or I
let a client go full open - their call. I MUST be in a position to cover
those costs and yes, at times unused bandwidth. That cost must be past on
to the client if I am to remain in business. If all clients were willing
to set a ceiling and be forced to live within that ceiling, then no
problem. Clients who select a ceiling pay for the (100 percent) of that
bandwidth (ceiling).
If I do not have the bandwidth to cover the peaks of all clients at the
same time, I am shorting the clients.
