Tx-Queues are usually assigned to subinterfaces only when explicit shaping or scheduling is configured. Without this feature, unshaped or unscheduled subinterfaces might continue to use the parent interface's Tx-Queues. This capability enables the allocation of a set of Tx-Queues to the subinterface, with the Tx-Queues operating at the maximum shaping rate derived from the parent interface. This feature is only supported in conjunction with Priority Aware Subinterface Scheduling.