Contention/Oversubscription maths

Frank Bulk frnkblk at iname.com
Sat May 28 00:18:30 CDT 2011


Wow, that works out be a per-connect max of 785 kbps.

Frank

-----Original Message-----
From: Adam Armstrong [mailto:lists at memetic.org] 
Sent: Friday, May 27, 2011 7:54 AM
To: Jeroen van Ingen
Cc: nanog at nanog.org
Subject: Re: Contention/Oversubscription maths

On 27/05/2011 13:44, Jeroen van Ingen wrote:
<snip>
> Perhaps students are not average users, but our Resnet currently has:
> * Approx 2000 connections, most at 100 Mbps.
> * These are divided into 4 areas, each area is connected with 1 Gbps to
> central location (so on average you could say we have 500 users sharing
> a 1 Gbps link)
> * Central location has 10 Gbps uplink; stats for this link over the last
> 7 days at 10-min average polling interval are:
> in: min 422 Mbps, avg 883 Mbps, max 1570 Mbps, 95th pct 1250 Mbps.
> out: min 48 Mbps, avg 272 Mbps, max 571 Mbps, 95th pct 459 Mbps.
>
> Perhaps these numbers can be used as an indication for your
> sizing/design.

Most useful response so far, thanks very much :)

adam.






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