Specifies either the minimum throughput of the queue as a percentage
of the throughput of each output port on which the service class is
implemented. If zero, there is no minimum rate. This field can not
be set by the user if rlDiffservModeEnabled = disabled and
rlPolicyServiceClassPriority > 0 or rlDiffservModeEnabled = enabled
and rlPolicyServiceClassPhbType = expeditedForwarding.