Single-rate tricolor marking (single-rate TCM)

A single-rate three-color policer defines a bandwidth limit and a maximum burst size for guaranteed traffic and a second burst size for peak traffic. A single-rate three-color policer is most useful when a service is structured according to packet length and not peak arrival rate.

Single-rate three-color policing meters a traffic stream based on the following configured traffic criteria: 

• Committed information rate (CIR)-Bandwidth limit for guaranteed traffic. 
• Committed burst size (CBS)-Maximum packet size permitted for bursts of data that exceed the CIR. 
• Excess burst size (EBS)-Maximum packet size permitted for peak traffic. 

Single-rate tricolor marking (single-rate TCM) classifies traffic as belonging to one of three color categories and performs congestion-control actions on the packets based on the color marking.