Method for sending data packet and network device

A second network device, comprising:

• one or more processors;
• and
• a non-transitory computer-readable memory storing a program to be executed by the one or
• more processors, the program including instructions that, when executed by the one or more processors, cause the second network device to:
• receive, at a first moment, a data packet sent by a first network device;
• and
• determine a second reference moment based on time information carried in the data packet, wherein the second reference moment is a reference moment for instructing the data packet to enter a queue in a second queue system, the second queue system is a queue system of the second network device, the time information is used to indicate a first remaining processing time for the data packet to pass the first network device, the first remaining processing time is a difference between a first delay and a first processing time, the first delay is a value not less than an absolute value of a difference between a first theoretical upper time limit and a first transmission time, the first theoretical upper time limit is a theoretical upper processing time limit from a first reference moment to the second reference moment, the first reference moment is a reference moment for instructing the data packet to enter a queue in a first queue system, the first queue system is a queue system of the first network device, the first transmission time is an actual transmission time from a first output moment at which the data packet is output by the first network device to the first moment, and the first processing time is an actual processing time from the first reference moment to the first output moment at which the data packet is output by the first network device, wherein
• determine, based on the second reference moment, a target queue from a plurality of queues comprised in the second queue system, and add the data packet to the target queue;
• and
• send the data packet to a third network device according to a scheduling rule corresponding to the second queue system.