Rate-limit vs Policing (recommendation from Cisco)
Hi guys,
I recently reviewed the IOS command reference http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hqos_r/qos_q1h.htm#wp1080850 and found something which I need clarification. Under the rate-limit command there’s this comment:
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*Policing Traffic with CAR *
*CAR embodies a rate-limiting feature for policing traffic. When policing traffic with CAR, Cisco recommends the following values for the normal and extended burst parameters: *
*normal burst = configured rate * (1 byte)/(8 bits) * 1.5 seconds *
*extended burst = 2 * normal burst *
*With the listed choices for parameters, extensive test results have shown CAR to achieve the configured rate. If the burst values are too low, then the achieved rate is often much lower than the configured rate.*
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However I cannot find any similar recommendation with the police command. Is this recommendation specifically targeting rate-limit command? And should we follow Cisco’s recommendation in the CCIE lab?
Thank you.
Simon
Category: CCIE Study
