From: alsontra@hotmail.com
Date: Thu Jan 22 2004 - 15:32:38 GMT-3
Hello All,
I'm finding the calculations for CAR based policing a little
confusing. I've read through the Cisco Policing and Shaping Overview, but
can't seem to understand normal and extended burst calculations. Cisco
recommends following values when policing:
normal burst = configured rate * (1 byte)/(8 bits) * 1.5 seconds
extended burst = 2 * normal burst
Aside from configured rate, where do the other parameters come from and what
are their respective meanings? I understand the classification and marking
aspects of CAR, so there is no need for any explanation there. However, a
practical example might help. For instance, lets say I have a 10mbit
Ethernet link and I've identified some flow that I want to constrain to 56k.
What would the policy-maps police statement look like?
"police bps burst-normal burst-max conform-action action exceed-action
action violate-action action"
police 56000 ????? ????? conform-action transmit exceed-action drop
I'm runnung IOS 12.1(11)EA1 on a 3550 and get errors when I put in a normal
burst size under 8000bytes.
SW1(config-pmap-c)#police 56000 ?
<8000-2000000> Normal burst bytes
Also normal and extended burst are in bytes, while rate is in bits???
Thanks,
Alsontra
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