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What is the difference between transmit-rate 'exact' and 'rate-limit' in interface CoS queue schedulers.

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Article ID: KB14597 KB Last Updated: 19 Aug 2009Version: 1.0
Summary:
This article describes the difference between the different kinds of bandwidth provisioning for interface queues that are used in schedulers.
Symptoms:

Solution:
The exact (transmit-rate) command on queues is a shaping action; for example when a queue reaches its transmit-rate with exact turned on, all subsequent packets are just buffered.

The rate-limit command queues is a policing action; for example when a queue reaches its transmit rate, subsequent packets will be dropped. 




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