Some Cisco Catalystswitches also support a kind of Weighted Round Robin Queuing as the 2950 switch, with 4 queues in where you can configure to place frames with specific CoS marking . You can also assign a specific weight on these queues which will be handled by the round-robin fashion cycle.
On this switch , queue 4 is designated as an “expedite” queue which give priority treatment to frames in that queue.
Please note that if you want to configure this queue as an expedite queue , you must put its weight to 0.