Method, apparatus, and system for implementing software-defined network SDN

A software-defined network (SDN) controller, comprising:

• a processor;
• and
• a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to:
• receive first information, wherein the first information comprises a first correspondence between information about a virtual machine (VM) and information about a server running the VM;
• receive second information, wherein the second information comprises a second correspondence between information about a network device connected to the server running the VM and the information about the server running the VM;
• and
• obtain a third correspondence between the information about the VM and the information about the network device according to the first information and the second information.

A network device, comprising:

• a processor;
• and
• a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to:
• receive a Link Layer Discovery Protocol (LLDP) packet sent by a server, wherein the LLDP packet carries information about the server;
• encapsulate, based on information about the network device, the LLDP packet as an OpenFlow message;
• and
• send the OpenFlow message to a software-defined network (SDN) controller.

A cloud computing platform, comprising:

• a processor;
• a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to:
• receive a virtual network configuration table sent by a server running a virtual machine (VM), wherein the virtual network configuration table comprises a correspondence between information about the VM and information about the server running the VM;
• and
• send the virtual network configuration table to a software-defined network (SDN) controller.

A device, comprising:

• a processor;
• and
• a non-transitory computer readable storage medium storing a program for execution by the processor, the program including instructions to:
• send first information to a cloud computing platform, wherein the first information comprises a correspondence between information about a virtual machine (VM) running on the device and information about the device;
• and
• send a Link Layer Discovery Protocol (LLDP) packet to a network device, wherein the LLDP packet carries the information about the device.