Configure Priority-based Flow Control

Priority-based flow control, which adopts priority-based flow control to control the forwarding traffic hop by hop, so as to realize that various types of traffic running on the Ethernet link are not affected by each other

Configuration Condition

None

Configure Priority-based Flow Control

PFC (Priority-based Flow Control) performs the traffic control based on the priority hop by hop. When the device forwards the packet, it enters the queue corresponding to the mapping relationship according to the priority of the packet for scheduling and forwarding. When the sending rate of the packets of one priority exceeds the receiving rate, resulting in insufficient available data buffer space of the receiver, the receiver will send PFC pause frame to the device of the previous hop. The device of the previous hop will stop sending the packets of the priority after receiving the pause frame packet, and the traffic transmission cannot be resumed until the PFC XON frame is received or after a certain aging time. Through the use of the PFC function, one type of traffic congestion will not affect the normal forwarding of other types of traffic, so that different types of packets on the same link do not affect each other.

Table 1-19 Configure the priority-based traffic control