policing on 10g interfaces in 12410 routers (bc and be restriction)

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Jan 6th, 2009
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i am using the below formula suggestes by cisco for calculating policing parameters like bc,be

CIR in bps

bc=(CIR)/8 * 1.5


So the above formula we are following it for 1G interfaces

we are seeing the maximum allowed bc

bytes as below

<1000-512000000> Burst bytes

conform-action action when rate is less than conform burst

pir Peak Information Rate


CUrrently we plan to upgrade the 1g to 10g interfaces but we cant able to configure the Bc and Be values for a policing more than 2G on 10G interface due to restriction in the maximum bc bytes shown above

Any new calcualtion we have to make or any standard formula is there for configuring the 'X'G policing on the 10G interface

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Giuseppe Larosa Tue, 01/06/2009 - 11:16
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Hello Rajesh,

Bc and Be are used to accomodate burst there are limitations caused by memory limitations on the linecards themselves.

So you can configure your police statements simply there isn't an additional burst size for example when starting to transmit.

The result will be that the actual rate policed is provided with less extra for bursts.

You probably have to take in account the L2 overhead in calculations that is more important for smaller packets (18 bytes of ethernet header and FCS)

Hope to help



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