Dell PowerConnect 5548 User Guide - Page 647

Combination of WRR and Strict Priority The priority for handling traffic can be selected for each queue. When the queuing mode is Weighted Round Robin for all queues, queues are serviced according to their weights. If all queues are assigned strict priority, queues are serviced according to that order. The following is true if some queues are assigned strict priority and others are assigned WRR: • If one queue is assigned strict priority, all higher queues are also assigned strict priority. Conversely, if a queue is assigned a WRR weight, all lower queues must also have a WRR weight assigned to them. • In the above case, traffic for the strict priority queues is always sent before traffic from the WRR queues. Traffic from the WRR queues is forwarded only after the strict priority queues have been emptied. The relative portion from each WRR queue depends on its weight. Dell PowerConnect 55xx Systems User Guide 647