The PCP field provides bits for priority levels ( through ). Higher values indicate higher priority. Voice traffic often uses PCP . Best effort traffic uses PCP . Network control traffic might use PCP . Switches can use PCP values to prioritize frames in queues. This is Layer QoS. Without PCP, all traffic competes equally during congestion.
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$ curl repovive.com/roadmaps/network-design/switching-and-vlans/priority-code-point-pcp
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