For Two Rate Three Color Marking (trTCM) policer using two-rate three-color marker) The maximum burst size parameter specifies the maximum burst size that can be transmitted by the source at the PIR while complying with the PIR. If the transmitted burst is lower than the MBS value, the packets are marked as out-profile by the meter to indicate that the traffic is not complying with CIR, but is complying with PIR.For Single Rate Three Color Marking (srTCM) (policer using single rate three color marker), the maximum burst size parameter specifies the maximum burst size that can be transmitted by the source while not complying with the CIR. If the transmitted burst is lower than the MBS value, the packets are marked as out-profile by the meter to indicate that the traffic is not complying with CIR. If the packet burst is higher than MBS, packets marked as red are dropped.
The operational MBS set by the system is adapted from the user-configured value by using the minimum constraint. The burst size configured by the user affects the rate step-size used by the system. The system uses the step size in a manner that both the burst-size and rate parameter constraints are met.