Packet loss detection method and system, sending device, and receiving device

A sending device, comprising:

• a sender, configured to send a service packet, wherein the service packet carries information indicating a color, colors of service packets sent within a same sending detection period belong to a same color spectrum, and color spectrums of service packets sent within adjacent sending detection periods have no intersection;
• and
• an inserting module, configured to insert a detection packet between service packets according to a sending detection period, wherein the detection packet carries the number of sent packets, wherein
• the sender is further configured to send the detection packet.

A packet loss detection system, comprising:

• a receiving device comprising:
• a receiver, configured to receive packets, which comprise a service packet whose color belongs to a first color spectrum and a detection packet;
• a counting module, configured to count the number of the service packets whose color belongs to the first color spectrum and that are received by the receiver, and when a preset condition is satisfied, stop counting the number of the service packets whose color belongs to the first color spectrum, wherein the detection packet carries the number of service packets whose color belongs to the first color spectrum and that are sent by a sending end;
• and
• a calculation module, configured to calculate, according to the number of the service packets whose color belongs to the first color spectrum counted by the counting module and the number of the service packets whose color belongs to the first color spectrum and that are sent by the sending end carried in the detection packet, the number of lost packets for the service packets whose color belongs to the first color spectrum;
• a sending device comprising:
• a sender, configured to send a service packet, wherein the service packet carries information indicating a color, colors of service packets sent within a same sending detection period belong to a same color spectrum, and color spectrums of service packets sent within adjacent sending detection periods have no intersection;
• and
• an inserting module, configured to insert a detection packet between service packets according to a sending detection period, wherein the detection packet carries the number of sent packets, wherein
• the sender is further configured to send the detection packet.