From: Robert Slaski (robin@atm.com.pl)
Date: Tue Dec 10 2002 - 11:29:18 GMT-3
P729 wrote:
> "We want to use some type of traffic policing so that the excess traffic
> that arrives at our port (10Mb) doesnt get dropped due to the bandwidth
> reduction."
>
> Herein lies one of the differences between policing and shaping. With
> policing, you're allowing for a certain amount of bursting such that TCP
> between the end-nodes polices itself to your desired commited rate.
> Excessive bursting will lead to dropped (vs. delayed) frames. This is
> necessary to "close the window." With shaping, you begin delaying
Policing will cause disaster with TCP traffic, especially if you discard
99 out of 100 frames (1Gbps->10Mbps). But you can use tail-drop-WRED
available on gigabit ports of 3550 along with aggregate policing. This
will cause TCP traffic to be smoothed using its windowing mechanisms,
and policing will not allow the traffic to excess 10Mb.
mikrobi,
-- .
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