Re: 3550 - Calculating Policing Values

From: Mark Lasarko (mlasarko@co.ba.md.us)
Date: Thu Jun 15 2006 - 15:17:09 ART


This might help?
http://www.cisco.com/en/US/products/hw/switches/ps646/products_tech_note09186
a00800feff5.shtml

"For example, calculate the minimum burst value in order to sustain a rate of
1 Mbps.
The rate is defined as 1000 Kbps, so the minimum burst needed is the sum of
this equation:
1000 (Kbps) / 8000 (1/sec) =125 (bits)

The minimum supported burst size is 8000 bytes,which is more than the minimum
burst calculated.

Note: Due to hardware policing granularity, the exact rate and burst is
rounded to the nearest supported value."

~M

>>> <chris.guzman@mckesson.com> 06/15/06 12:00 PM >>>

Trying to setup inbound policing on 3550 to limit ICMP traffic to a max of
256Kbps. Is their a way to calculate the burst bytes given the average or max
rate ? Anyone have a good link to explain values ?

<police rate-bps burst-byte>

class-map match-all map1
match access-group name ICMP
!
!
policy-map pmap1
class map1
   police 256000 ?? exceed-action drop

ip access-list extended ICMP
permit ICMP any any

Thanks



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