Simulation study on the effect of the trTCM parameters

In this paper, we study the effect of the two-rate three-color marker (trTCM) parameters on policing accuracy via computer simulation. The trTCM is a traffic conditioner and can be used as a policing/limiting mechanism in differentiated service networks. The trTCM algorithm described in RFC 2698 was configured using four traffic parameters: CBS (committed burst size), PBS (peak burst size), CIR (committed information rate), and PIR (peak information rate). With these parameters, it marked incoming packets green, yellow or red. Packets marked green were always queued and delivered to the output side, but packets marked yellow or red were either queued or dropped depending on the policing policy of the network. Among them, green packets were related to the policing rate and, therefore, policing accuracy. The policing rate of the trTCM algorithm was determined by CIR. By contrast, policing accuracy was influenced by other trTCM parameters. The findings in the study were that the policing accuracy of the trTCM was maximized when PIR was used, which is equal to CIR, and CBS, which is larger than twice the maximum packet length. PBS had no influence on the policing accuracy.