Traffic Shapping

Jeremy Porter jerry at
Sat Apr 25 22:05:16 UTC 1998

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

In message <19980425050329.10670.qmail at>, "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.
>Would you please specify what kind of Cisco platform that you are 
>Ehab Hadi
>Northern Telecom.
>Interprise Networking
>Ottawa, Ontario K1Y 4H7
>>From owner-nanog at Fri Apr 24 09:39:40 1998
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>>To: "Natambu Obleton" <no at>
>>cc: nanog at
>>Subject: Re: Traffic Shapping
>>In-reply-to: Your message of "Thu, 23 Apr 1998 17:51:16 MDT."
>>             <072601bd6f12$b4f15050$3b8d2dc7 at>
>>Date: Fri, 24 Apr 1998 11:24:29 -0500
>>From: Jeremy Porter <jerry at>
>>Sender: owner-nanog at
>>Sure we do it all the time.  There are CPU limitations on the
>>amount of total traffic that can be pushed through a router that
>>is traffic shaping.  I'm assuming because all the shaped traffic is
>>process switched.  Also you will probably want to dedicate a router
>>to it.
>>Typically these are only useful near the customer connection, as
>>you can really only shape outbound packets.  (unless you
>>traffic shape at your boarders, and have a "large" network, you've
>>already paid for the traffic by the time you discard it.)
>>In message <072601bd6f12$b4f15050$3b8d2dc7 at>, 
>"Natambu Oble
>>ton" writes:
>>>Has anyone here successfully implement the traffic shaping option on a 
>>>Natambu Obleton - Network Administrator - Frontier Internet Inc.
>>>970 385 4177 - fax: 970 385 6745 -
>>>777 Main St. - Suite #201 - Durango - Colorado - 81301 - USA
>>Jeremy Porter, Freeside Communications, Inc.      jerry at
>>PO BOX 80315 Austin, Tx 78708  | 512-458-9810
>Get Your Private, Free Email at

Jeremy Porter, Freeside Communications, Inc.      jerry at
PO BOX 80315 Austin, Tx 78708  | 512-458-9810

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