Minimum Burst on CAR

From: PANDI MOORTHY (moorthypandi@gmail.com)
Date: Sat Dec 15 2007 - 21:13:52 ART

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Hi Group

Need your help "rate-limit using CAR"

I need to limit the traffic entering the network to 1M with the minimum
burst value. Can you confirm whether my burst calculation is correct?

As per Cisco documentation the minimum burst value = bps / 2000 and the
value has to start from 1000

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hqos_r/qos_q1h.htm#wp1080850

So for 1M the minimum burst would be= 1000000 / 2000 = 500bytes. But the
lowest value has to start from 1000.

Here is my answer:

Rack1R8(config-subif)# rate-limit input 1000000 1000 2000 conform-action
transmit exceed-action drop

Illegal normal burst size

Increasing normal burst size to 1500 *--- But IOS automatically increase
the burst value to 1500*

Rack1R8(config-subif)#

Rack1R8(config-subif)#do sh run int fas

Rack1R8(config-subif)#do sh run int fas 0/0.28

interface FastEthernet0/0.28

  rate-limit input 1000000 1500 2000 conform-action transmit exceed-action
drop

Rack1R8(config-subif)#

Is the burst value 1500 correct?

Thanks

Regards
Pandi

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