Method for implementing network virtualization and related apparatus and communications system

A method for implementing network virtualization, the method comprising:

• obtaining a first routing entry delivered by a virtual controller, wherein the first routing entry carries outbound port information of a virtual forwarding device controlled by the virtual controller;
• determining a physical forwarding device based on a device mapping relationship between the virtual forwarding device and the physical forwarding device;
• determining outbound port information of the physical forwarding device, based on a port mapping relationship and the outbound port information of the virtual forwarding device;
• and
• sending a second routing entry to the physical forwarding device, wherein an action field of the second routing entry carries the outbound port information of the physical forwarding device.

A controller, comprising:

• a processor;
• and
• a non-transitory memory coupled to the processor and comprising instructions, which when executed by the processor, cause the controller to:
• create a virtual network comprising a virtual forwarding device;
• establish a device mapping relationship between the virtual forwarding device and a physical forwarding device in a physical network;
• establish a port mapping relationship between a port of the virtual forwarding device and a port of the physical forwarding device;
• and
• register the virtual forwarding device with a virtual controller, wherein the virtual controller is usable to control the virtual network.

A controller, comprising:

• a processor;
• and
• a non-transitory memory coupled to the processor and comprising instructions, which when executed by the processor, cause the controller to:
• obtain a first routing entry delivered by a virtual controller, wherein the first routing entry carries outbound port information of a virtual forwarding device controlled by the virtual controller;
• determine, based on the virtual forwarding device and a device mapping relationship, a physical forwarding device, wherein the device mapping relationship comprises a mapping relationship between the virtual forwarding device and the physical forwarding device in a physical network;
• determine, based on a port mapping relationship and the outbound port information of the virtual forwarding device, outbound port information of the physical forwarding device, wherein the port mapping relationship comprises a mapping relationship between the outbound port information of the virtual forwarding device and the outbound port information of the physical forwarding device;
• and
• send a second routing entry to the physical forwarding device, wherein the second routing entry carries the outbound port information of the physical forwarding device.