[37967] in Resnet-Forum
Re: New Stratagies to Meet Higher Bandwidther Requirements in the HD Video World
daemon@ATHENA.MIT.EDU (Jeff Kell)
Tue Feb 12 21:30:55 2013
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Message-ID: <511AFA7A.7070408@utc.edu>
Date: Tue, 12 Feb 2013 21:29:14 -0500
Reply-To: Resnet Forum <RESNET-L@LISTSERV.ND.EDU>
From: Jeff Kell <jeff-kell@utc.edu>
To: RESNET-L@LISTSERV.ND.EDU
In-Reply-To: <EB210B37BD40B841BCC40156B1D70B47239E9381@SMU-MBX1.SMUNET.SMU.CA>
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On 2/12/2013 8:41 AM, Glenn Sutherland wrote:
> Our campus has a 200M commercial internet connection which is where
> most internet traffic passes, (except Facebook, Netflix, Google, and a
> couple others), and this 200M link is managed by our PacketShaper.
> In our PacketShaper we assign 150M (of the 200) to student traffic,
> and allow it to burst to 175M, needless to say it is always running at
> 175M.
We formerly had PacketShaper, and did similar allocations for our
resnet. The downside was that it was a hard ceiling, and if any
remaining bandwidth wasn't being utilized otherwise, you couldn't
"borrow". Procera allows this, and other more flexible shaping rules.
> How are you dealing with the increased demand? Are you restricting
> more what users are doing? (Something that would not fly well here).
> Increasing available bandwidth?
If your "important" or "priority" or "preferred" or whatever traffic
demands exceeds your available pipe, shaping falls apart.
You can go the "equal rights" direction like a NetEqualizer, but again,
if the demand exceeds your available pipe and your user's patience, even
equal access falls apart. Everybody is equally miserable :)
Beyond a certain point (and I've been there!) there is no acceptable
solution, and you have to wait until the noise level reaches the level
of the appropriate management and you hopefully are granted some
additional funding for bandwidth.
The converse is also true, if you have adequate budget to provide enough
bandwidth to keep your peak utilization below 80-90%, you have no real
need to shape or equalize or prioritize or anything else.
We use our Procera primarily to prioritize certain traffic (business
cases, gaming, VoIP, Skype, etc) that is relatively low volume in the
overall scheme but terribly sensitive to any latency. We also
prioritize campus over resnet, and all over guest access. We also use
it to penalize the corner cases... we have a daily transfer volume
"quota" that starts to squeeze the bandwidth allowed down if exceeded.
We also get very good network visibility, statistics, and traffic
tracking (preferred over netflow, more details available).
Bandwidth demand continues to increase... we've gone over two, almost
three orders of magnitude increase over the last two decades, almost
doubling every year with no end in sight.
There is no "golden box" that makes everyone's wishes fit into a
woefully inadequate pipe :)
Jeff
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<div class="moz-cite-prefix">On 2/12/2013 8:41 AM, Glenn Sutherland
wrote:<br>
</div>
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<div class="WordSection1"><font color="#3333ff">Our campus has a
200M commercial internet connection which is where most
internet traffic passes, (except Facebook, Netflix, Google,
and a couple others), and this 200M link is managed by our
PacketShaper. In our PacketShaper we assign 150M (of the
200) to student traffic, and allow it to burst to 175M,
needless to say it is always running at 175M. </font><br>
</div>
</blockquote>
<br>
We formerly had PacketShaper, and did similar allocations for our
resnet. The downside was that it was a hard ceiling, and if any
remaining bandwidth wasn't being utilized otherwise, you couldn't
"borrow". Procera allows this, and other more flexible shaping
rules.<br>
<br>
<blockquote
cite="mid:EB210B37BD40B841BCC40156B1D70B47239E9381@SMU-MBX1.SMUNET.SMU.CA"
type="cite">
<div class="WordSection1"><o:p></o:p>
How are you dealing with the increased demand? Are you
restricting more what users are doing? (Something that would not
fly well here). Increasing available bandwidth?
<o:p></o:p><br>
</div>
</blockquote>
<br>
If your "important" or "priority" or "preferred" or whatever traffic
demands exceeds your available pipe, shaping falls apart. <br>
<br>
You can go the "equal rights" direction like a NetEqualizer, but
again, if the demand exceeds your available pipe and your user's
patience, even equal access falls apart. Everybody is equally
miserable :)<br>
<br>
Beyond a certain point (and I've been there!) there is no acceptable
solution, and you have to wait until the noise level reaches the
level of the appropriate management and you hopefully are granted
some additional funding for bandwidth.<br>
<br>
The converse is also true, if you have adequate budget to provide
enough bandwidth to keep your peak utilization below 80-90%, you
have no real need to shape or equalize or prioritize or anything
else.<br>
<br>
We use our Procera primarily to prioritize certain traffic (business
cases, gaming, VoIP, Skype, etc) that is relatively low volume in
the overall scheme but terribly sensitive to any latency. We also
prioritize campus over resnet, and all over guest access. We also
use it to penalize the corner cases... we have a daily transfer
volume "quota" that starts to squeeze the bandwidth allowed down if
exceeded. We also get very good network visibility, statistics, and
traffic tracking (preferred over netflow, more details available).<br>
<br>
Bandwidth demand continues to increase... we've gone over two,
almost three orders of magnitude increase over the last two decades,
almost doubling every year with no end in sight. <br>
<br>
There is no "golden box" that makes everyone's wishes fit into a
woefully inadequate pipe :)<br>
<br>
Jeff<br>
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