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QoS Calculate Bc values

Hi

 

I am trying to customize the AutosQos Voip QOS on a 4500 with supervisor 7e to attach it to a port-channel.

 

I had to split the original Policy Map AutoQos-4.0-Output-Policy in 2 policy maps, because the etherchannel interfaces do not support queuing. So i had to create one policy map with queuing actions and one with policing actions for the priority queue. Also the class-maps for etherchannels have to have one type of match filter.

 

For the policing actions, it looks like etherchannels do not support the "CIR percent" command, the CIR has to be specified in bit rate, and i have no idea how can i calculate the Bc values.

 

Ive seen that the switch does the math for you, but i would like to understand how the Bc value is calculated?

 

Regards

Gonçalo Reis

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