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To: Sean Donelan <sean@donelan.com>
Cc: "Majdi S. Abbas" <msa@latt.net>, nanog@merit.edu
In-Reply-To: Your message of "Tue, 23 Oct 2007 00:35:21 EDT."
<Pine.GSO.4.64.0710230030380.17870@clifden.donelan.com>
From: Valdis.Kletnieks@vt.edu
Date: Tue, 23 Oct 2007 02:28:14 -0400
Errors-To: owner-nanog@merit.edu
--==_Exmh_1193120894_3033P
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On Tue, 23 Oct 2007 00:35:21 EDT, Sean Donelan said:
> This doesn't explain why many universities, most with active, symmetric
> ethernet switches in residential dorms, have been deploying packet shaping
> technology for even longer than the cable companies. If the answer was
> as simple as upgrading everyone to 100Mbps symmetric ethernet, or even
> 1Gbps symmetric ethernet, then the university resnet's would be in great
> shape.
If I didn't know better, I'd say Sean was trolling me, but I'll bite anyhow. ;)
Actually, upgrading everybody to 100BaseT makes the problem worse, because
then if everybody cranks it up at once, the problem moves from "need upstream
links that are $PRICY" into the "need upstream links that are $NOEXIST".
We have some 9,000+ students resident on campus. Essentially every single
one has a 100BaseT jack, and we're working on getting to Gig-E across the
board over the next few years.
That leaves us two choices on the upstream side - statistical mux effects (and
emulating said effects via traffic shaping), or find a way to trunk 225 40GigE
links together. And that's just 9,000 customers - if we were a provider
the size of most cable companies, we'd *really* be in trouble.
Fortunately, statistical mux effects and a little bit of port-agnostic traffic
shaping (you go over a well-publicized upload byte limit for a 24 hour span,
you get magically turned into a 56k dialup), we fit quite nicely into a
single gig-E link and a 622mbit link.
Now if any of you guys have a lead on an affordable way to get 225 40GigE's
from here to someplace that can *take* 225 40Gig-E's... ;)
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