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traffic shaping CIR refering to layer 2?

Hi,

 

When I use following command,

shape average 50m

is the CIR rate 50Mbps referring to layer1? I am asking this question because I observed throughput difference between 64bytes and 1500bytes packet (calculated from show interface throughput reading). I am wondering if it is caused by preamble and inter-frame gap impact of Ethernet.

 

Thanks,

 

James

 

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