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.

Links:

https://networklessons.com/quality-of-service/qos-traffic-shaping-explained

https://forum.networklessons.com/t/shaping-with-burst-up-to-interface-speed/1012/11?u=lagapides

https://forum.networklessons.com/t/qos-policing-configuration-example/1158/61?u=lagapidis