Congestion management mechanism on an S series switch

On S series switches (except S1700), each physical port has eight sending queues numbered from 7 to 0 in descending order of priority. Queue 7 has the highest priority and queue 0 has the lowest priority. Sending ports support the following queue scheduling modes: PQ, WRR, DRR, PQ+WRR, and PQ+DRR.
When PQ+WRR or PQ+DRR is used, packets in PQ queues are scheduled first. The PQ queue with the highest priority is scheduled preferentially and then PQ queues with lower priorities are scheduled in succession. After all PQ queues are scheduled, WRR or DRR queues are then scheduled.
For WRR and DRR queues, the queues are scheduled to ensure bandwidth first and then scheduled based on weights.
The S5720HI fixed switch and X series cards of S series modular switches do not support WRR and PQ+WRR scheduling.

Other related questions:
Method used to configure congestion avoidance and congestion management on S series switches
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