However, a fixed number of queues exist, and the queues are usually not configurable. Older or lower end switches have only two queues or none. Newer or higher-end switches commonly have four or eight queues, with eight being the maximum because there are only eight Layer 2 priority levels. When configured, the Ethernet switch can identify the high-priority traffic by the 802.1p/Q tag and assign that traffic to a high-priority queue. On some switches, a specific port can be designated as a high-priority port, which causes all traffic that originates from that port to be assigned to a high-priority queue.
