Queuing mechanism. strictPriority(1) : Strict Priority wrr(2) : Weighted Round Robin strict7wrr(3) : 1 SP + 7WRR strict6wrr(4) : 2 SP + 6WRR Strict-priority scheduling is implemented with a special strict-priority scheduler node that is stacked directly above the port. Queues stacked on top of the strict-priority scheduler node always get bandwidth before other queues. Weighted round-robin scheduling is designed to better handle queues with different processing capacities. Each queue has a weight : Low is 1, Medium is 2, High is 4 and Highest is 8 for WS3 spec. Queues with higher weights get bandwidth before than other queues with less weights.