Service link selection control method and device

A policy and charging rules function (PCRF) unit, comprising:

• one or more processors;
• and
• a memory storing program instructions that, when executed by the one or more processors, configure the PCRF unit to:
• obtain a service chain selection policy, wherein the service chain selection policy comprises a first corresponding relation corresponding to first policy contextual information, a first application type, and a first service chain;
• determine a first service chain selection control policy based on the first policy contextual information and the service chain selection policy, wherein the first service chain selection control policy comprises the first corresponding relation between the first application type and the first service chain;
• and
• send the first service chain selection control policy to a flow classifier,
• wherein the first service chain is a path comprising one or more first forwarding devices, a first service flow needs to pass through the one or more first forwarding devices, the first service flow is from a user device matching the first policy contextual information, and a type of the first service flow is the first application type.

A non-transitory computer readable storage medium, comprising instructions that, when executed by a computer, cause the computer to:

• receive a first service flow, wherein a type of the first service flow is a first application type;
• obtain, from a policy and charging rules function (PCRF) unit, a service chain selection control policy;
• determine a first service chain corresponding to the first application type according to a first corresponding relation, wherein the service chain selection control policy comprises the first corresponding relation between the first application type and a first identifier of the first service chain;
• and
• forward a second service flow to a forwarding device, wherein the second service flow comprises the first service flow and the first identifier of the first service chain, the first service chain comprises a path, the path comprises the forwarding device, and the first service flow flows through the forwarding device.