How QCN works
Figure 34 shows how QCN works.
The CP periodically samples frames from queues that are enabled with QCN and sends CNMs to the RPs when congestion occurs.
The RPs reduce their transmission rates when receiving CNMs. The RPs also periodically probe the bandwidth and increase their transmission rates if they fail to receive CNMs for a specific period of time.
Figure 34: How QCN works
