ECN (Explicit Congestion Notification)
Stop network congestion by marking the packets congested. So that the receiver of the packets can let sender know to reduce traffic rate
Similar to PFC (Priority Flow Control) but in Layer 3 while PFC is in Layer 2
kmin: threshold for marking the packets. When congestion reaches this threshold, packet will notify sender about congestionkmax: maximum threshold for marking packets. If congestion level reaches this threshold, we will start marking more aggressivelypmax: highest probability that a packet is marked when the queue exceedskminbelowkmax