Abstract: A computer-implementation method includes receiving a data packet; identifying a virtual queue from a list of virtual queues to which the data packet pertains; and determining whether the identified virtual queue size exceeds a threshold maximum size. When the first size does not exceed the threshold maximum size, the identified virtual queue is increased based on a size of the data packet and the data packet is forwarded. The method further includes setting a virtual queue from the list of virtual queues as a target queue; determining a service capacity based on an update time interval and increasing a credit allowance based on the service capacity. The target queue is reduced by an amount based on the credit allowance size, and the credit allowance is reduced by the same amount.