Congestion notification method based on message mirror image and chip

The invention provides a congestion notification method based on a message mirror image and a chip, relates to the technical field of network communication, and can improve the processing efficiency of message congestion. The method is applied to a forwarding chip in the message forwarding equipment, the message forwarding equipment further comprises a central processing unit (CPU), the forwarding chip is coupled with the CPU, and the method comprises the following steps: receiving an internet protocol (IP) message from sending end equipment, and sending the IP message to the forwarding end equipment according to forward flow direction information carried by the IP message under the condition of monitoring that a sending queue is congested; the method comprises the steps of retrieving and determining a corresponding flow direction data entry from a flow direction information table, determining reverse flow direction information according to the flow direction data entry, generating a mirroring CNP according t