[140978] in North American Network Operators' Group
Re: Contention/Oversubscription maths
daemon@ATHENA.MIT.EDU (David Swafford)
Thu May 26 22:22:16 2011
In-Reply-To: <4DDED8D0.3010806@memetic.org>
Date: Thu, 26 May 2011 22:21:28 -0400
From: David Swafford <david@davidswafford.com>
To: Adam Armstrong <lists@memetic.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi Adam,
>From the perspective of an enterprise customer, if we're talking
strictly Internet circuits, you're over-subscription estimates seem
very conservative to me. On our 100mb/s Internet circuits, our
average utilization is about 40mb/s down and 15-20mb/s up on any given
day.
David.
On Thu, May 26, 2011 at 6:48 PM, Adam Armstrong <lists@memetic.org> wrote:
> Hi All,
>
> Do any of you have any pointers on how to go about predicting usage for
> high-speed ethernet access?
>
> I'm running 1GE links into buildings, and hanging many (100-1000) 100M
> customers off switches in the basement, simple enough.
>
> I'm assuming ~300Kbps average peak usage per customer, but I can't quite
> work out at what point that number becomes more important than the fact that
> each user can peak at 100mbit (and that the backhaul is only access-speed *
> 10).
>
> I'm well versed in the economies of scale of fitting 10,000 8mbit customers
> into 1GE, but this seems altogether a different beast to predict. If any of
> you have similar scenarios I'd be very interested to hear on/off list :)
>
> Finally, what do people think of selling a 1G service with 1G backhaul (and
> potentially 10s or 100s of customers buying this service alongside n*100s of
> customers with 100M service)?
>
> Thanks,
> adam.
>
>
