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Re: Traffic Shapping
From: Jeremy Porter <jerry () freeside fc net>
Date: Sat, 25 Apr 1998 17:05:16 -0500


Traffic shaping in the core of a network won't scale. "enterprise" or private
networks haven't got much life left in them.  (This is Nanog right?)
We use 2500 series ciscos for traffic shaping at T-1 and below, but that
isn't terribly related to nanog either.
One just has to look at exchange point data to see what
traffic volumes are like, I don't know of anything that
can switch VC near 2gbps/sec particuarlly with the flow life times
of Internet traffic.
It's much cheaper to shape/filter at the borders and overengineer the
core.  It also increases usefull lifetime of hardware.  (No forklift
upgrades).

In message <19980425050329.10670.qmail () hotmail com>, "Ehab Hadi" writes:
I think traffic shaping is very importent. I agree to the point
that the new traffic shaping approches tends to shape on near the
edges, but that would not prevent applying such approches in the
core especially if its an interprise net.
The shapping implemintation preferred to be implemented in switch
because the hardware is simply fast and efficient.
Jeremy,
Would you please specify what kind of Cisco platform that you are 
using?

Ehab Hadi
Northern Telecom.
Interprise Networking
Ottawa, Ontario K1Y 4H7
Canada


From owner-nanog () merit edu Fri Apr 24 09:39:40 1998
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Message-Id: <199804241624.LAA14282 () freeside fc net>
To: "Natambu Obleton" <no () frontier net>
cc: nanog () merit edu
Subject: Re: Traffic Shapping
In-reply-to: Your message of "Thu, 23 Apr 1998 17:51:16 MDT."
            <072601bd6f12$b4f15050$3b8d2dc7 () hermosa frontier net>
Date: Fri, 24 Apr 1998 11:24:29 -0500
From: Jeremy Porter <jerry () freeside fc net>
Sender: owner-nanog () merit edu


Sure we do it all the time.  There are CPU limitations on the
amount of total traffic that can be pushed through a router that
is traffic shaping.  I'm assuming because all the shaped traffic is
process switched.  Also you will probably want to dedicate a router
to it.

Typically these are only useful near the customer connection, as
you can really only shape outbound packets.  (unless you
traffic shape at your boarders, and have a "large" network, you've
already paid for the traffic by the time you discard it.)

In message <072601bd6f12$b4f15050$3b8d2dc7 () hermosa frontier net>, 
"Natambu Oble
ton" writes:
Has anyone here successfully implement the traffic shaping option on a 
Cisco
router?
--
Natambu Obleton - Network Administrator - Frontier Internet Inc.
970 385 4177 - fax: 970 385 6745 - http://www.frontier.net
777 Main St. - Suite #201 - Durango - Colorado - 81301 - USA



---
Jeremy Porter, Freeside Communications, Inc.      jerry () fc net
PO BOX 80315 Austin, Tx 78708  | 512-458-9810
http://www.fc.net



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---
Jeremy Porter, Freeside Communications, Inc.      jerry () fc net
PO BOX 80315 Austin, Tx 78708  | 512-458-9810
http://www.fc.net


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