Traffic alarm method and apparatus based on programmable switch, device and medium

A traffic alarm method based on a programmable switch, comprising:

• step (1) receiving a data packet sent from a sending end, wherein the data packet carries different priority information;
• step (2) monitoring a traffic rate of the data packet in real time, and adopting different processing logics according to different traffic rates;
• when the traffic rate is smaller than a threshold, forwarding the data packet to a receiving end directly without any processing on the data packet, and when the traffic rate is greater than or equal to the threshold, sampling a traffic to acquire priority information in the data packet and multicasting on the data packet;
• step (3) comparing the priority information in the data packet with historical priority information, and feeding back the compared lowest priority information to the sending end in real time;
• sub-step (3.1) extracting a value of a priority of the data packet obtained by sampling, and comparing the value with historical priority information stored in a register of the programmable switch;
• wherein when the value of the priority of the data packet is smaller than a value of a priority in the register, the value in the register is replaced with the value of the priority of the data packet;
• when the value of the priority of the data packet is greater than or equal to the value of the priority in the register, the value of the priority of the data packet is unchanging;
• and
• sub-step (3.2) feeding back the lowest priority information to the sending end:
• modifying the data packet multicasting to the sending end, and modifying a priority field of the data packet to a lowest priority, so as to feed back the lowest priority information in a link to the sending end;
• and
• step (4) adjusting, by the sending end, a sending service timely according to real-time feedback information to reduce the traffic rate of the data packet that carries low priority information.