QoS Traffic Shaping Parameters

When configuring traffic shaping, there are several parameters that are used to tune the shaping behavior. These are:

  • CIR is the committed information rate, which is the number of bits per second which is the data rate agreed upon between the ISP and the customer.
  • Tc is the time interval used for calculations of the shaping.
  • Bc is the committed burst rate. This is the number of bits that will be sent every Tc, based on the CIR. It is also the maximum size of the bucket.
  • Be is the excess burst rate, which is the additional bits per Tc that we will allow under certain conditions.

The relationship between these parameters includes the following formula:

Bc = CIR * Tc

These parameters are also valid for policing as well.





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