Flow specification protocol-based communications method, device, and system

A Flow Specification protocol-based communication method, comprising:

• receiving, by a forwarding device, a Border Gateway Protocol Flow Specification BGP Flow Spec protocol packet sent by a controller, wherein the BGP Flow Spec protocol packet comprises a network layer reachability information field and an extended community attribute field, the network layer reachability information field carries characteristic information, of a first resource, that is used to indicate the first resource on the forwarding device, the extended community attribute field carries a global identifier GID used to indicate a second resource on the forwarding device, and the BGP Flow Spec protocol packet is used to instruct to associate the first resource with the second resource;
• obtaining, by the forwarding device, the first resource according to the characteristic information of the first resource, and obtaining the second resource according to the GID;
• and
• associating, by the forwarding device, the first resource with the second resource.

A forwarding device, comprising:

• a receiving module, configured to receive a Border Gateway Protocol Flow Specification BGP Flow Spec protocol packet sent by a controller, wherein the BGP Flow Spec protocol packet comprises a network layer reachability information field and an extended community attribute field, the network layer reachability information field carries characteristic information, of a first resource, that is used to indicate the first resource on the forwarding device, the extended community attribute field carries a global identifier GID used to indicate a second resource on the forwarding device, and the BGP Flow Spec protocol packet is used to instruct to associate the first resource with the second resource;
• an obtaining module, configured to:
• obtain the first resource according to the characteristic information that is of the first resource and that is received by the receiving module, and obtain the second resource according to the GID;
• and
• an association module, configured to associate the first resource with the second resource according to the BGP Flow Spec protocol packet received by the receiving module.

A controller, comprising:

• a processor and a memory;
• the memory is configured to store an instruction;
• the processor is configured to execute the instruction stored in the memory to cause the controller to:
• obtain a requirement indicating that a first resource on a forwarding device needs to be associated with a second resource on the forwarding device;
• send a Border Gateway Protocol Flow Specification (BGP) Flow Spec protocol packet to the forwarding device according to the requirement, wherein the BGP Flow Spec protocol packet comprises a network layer reachability information field and an extended community attribute field, the network layer reachability information field carries characteristic information of the first resource, the extended community attribute field carries a global identifier (GID) used to indicate the second resource, and the BGP Flow Spec protocol packet is used to instruct to associate the first resource with the second resource.

A forwarding device, comprising:

• a processor and a memory;
• the memory is configured to store an instruction;
• the processor is configured to execute the instruction stored in the memory to cause the forwarding device to:
• receive a Border Gateway Protocol Flow Specification (BGP) Flow Spec protocol packet sent by a controller, wherein the BGP Flow Spec protocol packet comprises a network layer reachability information field and an extended community attribute field, the network layer reachability information field carries characteristic information, of a first resource, that is used to indicate the first resource on the forwarding device, the extended community attribute field carries a global identifier GID used to indicate a second resource on the forwarding device, and the BGP Flow Spec protocol packet is used to instruct to associate the first resource with the second resource;
• obtain the first resource according to the characteristic information of the first resource, and obtaining the second resource according to the GID;
• and
• associate the first resource with the second resource.