Service traffic steering method, device and system

An uplink classifier, comprising:

• one or more processors and a memory storing computer-readable operation instructions, wherein when the computer-readable operation instructions in the memory are run, the processor is configured to:
• identify a steering path identifier of a downlink service traffic according to a service traffic steering policy;
• and
• send the steering path identifier of the downlink service traffic and description information of the downlink service traffic to a downlink classifier to enable the downlink classifier to mark the downlink service traffic according to the steering path identifier of the downlink service traffic, wherein the uplink classifier and the downlink classifier are deployed in different network devices.

A downlink classifier, comprising:

• one or more processors and a memory storing computer-readable operation instructions, wherein when the computer-readable operation instructions in the memory are run, the processor is configured to:
• receive a steering path identifier of a downlink service traffic and description information of the downlink service traffic from an uplink classifier;
• and
• configured to mark the downlink service traffic according to the steering path identifier of the downlink service traffic and the description information of the downlink service traffic, wherein the uplink classifier and the downlink classifier are deployed in different network devices.