The 7210 SAS devices support the following meter modes:
srtcm - Single Rate Three Color Marking
trtcm - Two Rate Three Color Marking
trtcm1 - Two Rate Three Color Marking1 (applicable only for service ingress QoS policies)
trtcm2 - Two Rate Three Color Marking2 (applicable only for service ingress QoS policies)
In srtcm, the CBS and MBS token buckets are replenished at single rate, that is, CIR. Whereas in the case of trtcm, CBS and MBS buckets are individually replenished at CIR and PIR rates, respectively. trtcm1 implements the policing algorithm defined in RFC 2698, and trtcm2 implements the policing algorithm defined in RFC 4115.