A network device including a plurality of queues configured to store respective frames of data having a priority level. The network device includes a shaper configured to transmit, during a first portion of a transmission interval, frames of data from a first one of the plurality of queues having a highest priority level, block frames of data from a second one of the plurality of queues during a blocking band extending from a first time prior to a start of the transmission interval to a second time indicating the start of the transmission interval, determine, based on the second time and a maximum frame size to be transmitted during the transmission interval, the second time, and selectively transmit, subsequent to the first time and prior to the second time, frames of data from the second one of the plurality queues based on the second time.