Specifies the QoS action to take on traffic in this traffic
class before metering actions are taken. If none(0) is specified,
the traffic is passed to the metering stage. If usemarkvalue(1) is
specified, the QoS settings are taken from the variable
qosSwitchTrafficClassMarkValue used as an index into the DCSP
MAP table. If usedscp(2) is specified, the DSCP value in the data
frames is used as an index into the DSCP MAP table.