Data packet transmission method and network device

A data packet transmission method, applied to a network device, the network device comprising a master control unit and at least two output interface units, and the at least two output interface units comprising one master output interface unit and at least one slave output interface unit, wherein the method comprises:

• sending, by the master control unit, an information synchronization packet to the master output interface unit and a target slave output interface unit, wherein the information synchronization packet comprises a flow identifier of a deterministic flow;
• after receiving the information synchronization packet, writing, by the master output interface unit, a master sequence number into a master synchronization sequence number register corresponding to the flow identifier, wherein the master sequence number is a sequence number of a last data packet received by the master output interface unit;
• after receiving the information synchronization packet, writing, by the target slave output interface unit, a salve sequence number into a slave synchronization sequence number register corresponding to the flow identifier, wherein the slave sequence number is a sequence number of a last data packet received by the target slave output interface unit;
• reading, by the master control unit, the master sequence number from the master synchronization sequence number register, reading the slave sequence number from the slave synchronization sequence number register, and writing a target difference between the master sequence number and the slave sequence number into a distance register corresponding to the flow identifier of the target slave output interface unit;
• based on a start sequence number corresponding to the flow identifier and the target difference in the distance register, adding, by the target slave output interface unit, a target sequence number to a data packet corresponding to the flow identifier, and sending a modified data packet, wherein the start sequence number is a sequence number of a received last data packet.