Priority queueing is a legacy type of queueing that uses four queues. They are high, medium, normal and low. Priority queueing is prone to queue starvation because it will entirely empty one queue before moving on to the next. That means that if there are constantly packets in the high queue then the other queues will never get served.
You can assign either protocols or use access-lists to map traffic to the different queues in the following way:
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I just want to emphasis what Daniel already noted, which is in PQ each queue has absolute priority over any queues "below" it, which means, for example, "low" queue packets will only be transmitted when there are no "high", "medium" or "normal" packets waiting to be transmitted. So as Daniel also noted, PQ can easily "starve" lower queues of all bandwidth.
BTW, since PQ is just looking at queue contents, it also doesn't consume much device resource for its management.
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