rate-limit query

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May 12th, 2007
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Hi Friends,


I have an interface configured with rate-limit command as below


rate-limit output access-group 140 64000 8000 8000 conform-action transmit exceed-action drop


Can you plz help me understand what does the values 8000 & 8000 are? I am a bit confused with reading the command syntax from cisco. Also plese help me know how these values are calculated. Thx a lot.


- Manoj

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bjornarsb Sat, 05/12/2007 - 09:00
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Hi,


Burst is a term used in a number of information technology contexts to mean a specific amount of data sent or received in one intermittent operation. It can be contrasted with streamed, paced, or continuous. Generally, a burst operation implies that some threshold has been reached that triggers the burst. Depending on the particular technology, a burst operation can be intermittent at a regular or an irregular rate.


To obtain the best use of burst-size and excess-burst-size, specify only the required bit-rate value. The software will automatically tune the other values for optimum performance.


BR,

Bjornarsb


Manoj Wadhwa Sat, 05/12/2007 - 09:12
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Will my traffic for that particular access-list be limited to 64K or something more than that. If more, what would be the actual figure.

bjornarsb Sat, 05/12/2007 - 09:20
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Yes, average 64 K long-term


and you will also allow bursts (at the configured size) before traffic is concidered to exceed the rate-limit.

This makes you get a more nicer "curve"




BR,

Bjornarsb

bjornarsb Sat, 05/12/2007 - 09:30
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Hi,


How about traffic shaping instead?

The excess traffic is queued.

If the switch fabric queues overflow, the traffic is dropped.

traffic-shape group {target-bit-rate | bit per interval }




Br,

Bjornarsb


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