rate-limit question

Unanswered Question
Dec 11th, 2007
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Is this correct?

A 5Mb link burstable to 10Mb. The following command:


rate-limit output 5000000 2500000 5000000 conform-action transmit exceed-action drop


would allow a 5Mb link with 2.5Mb bursts (=1.5 seconds) upto 5Mb or 10Mb total

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guruprasadr Tue, 12/11/2007 - 23:06
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HI, [Pls Rate if HELPS]


bps

>>Average rate in bits per second. The value must be in increments of 8 kbps.

burst-normal

>>Normal burst size in bytes. The minimum value is bps divided by 2000.

burst-max

>>Excess burst size in bytes.


The above is the logic in QOS rate-limit calculation.


Do Rate if HELPS


Best Regards,


Guru Prasad R

fallonem82 Wed, 12/12/2007 - 06:55
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Lets try this again and I'll use proper bit numbering instead of rounding


rate-limit output 5242880 2622 655360 conform-action transmit exceed-action drop


this command will allow a 5Mb connection with a normal-burst of 2622Bytes (5242880/2000) upto a max burst of 5Mb (5242880/8) effectively allowing a 5Mb link to burst to a total of 10Mb


Is this right or am I WAY off?

guruprasadr Wed, 12/12/2007 - 20:33
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HI, [Pls Rate if HELPS]


"2000" is the default value for normal-burst and max-burst and do follow the same if the link capacity is only 5 Mb.


Consider the Link is 10 Mb where internet traffic is limited to 5 Mb means:


rate-limit input access-group 100 5000000 1000000 1000000 conform-action transmit exceed-action drop


In the above Eg:

>>5 Mb of normal traffic

>>1 Mb of Normal Burst

>> 1 Mb of Max Burst


Hope this is Informative


PLS RATE if HELPS


Best Regards,


Guru Prasad R



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