Packet transmission method, device, and system

A packet transmission system, comprising:

• a first network device;
• a second network device, wherein the first network device is in a virtual private LAN service (VPLS) network, and the second network device is in a virtual private wire service (VPWS) network;
• the first network device is configured to:
• receive a first packet through a first port of a first VPLS instance executing on the first network device;
• determine a first VPWS instance executing on the first network device that has an association relationship with the first port of the first VPLS instance;
• and
• forward, using the first VPWS instance, the first packet to a second VPWS instance executing on the second network device, wherein the second network device is in the VPWS network, and wherein the first packet is to be sent to a first user-side device connected to the second network device, and the first VPWS instance and the second VPWS instance bear a same service;
• and
• the second network device is configured to forward the first packet by using the second VPWS instance.

A first network device comprising:

• a memory and a processor, wherein the memory is configured to store a computer program;
• and
• the processor is configured to execute the computer program stored in the memory that cause the first network device to:
• receive a first packet through a first port of a first virtual private LAN service (VPLS) instance executing on the first network device, wherein the first packet is to be sent to a first user-side device connected to a second network device;
• determine a first virtual private wire service (VPWS) instance executing on the first network device that has an association relationship with the first port of the first VPLS instance;
• and
• forward, using the first VPWS instance, the first packet to a second VPWS instance executing on the second network device, wherein the second network device is in the VPWS network, and wherein the first VPWS instance and the second VPWS instance bear a same service.

A non-transitory computer-readable storage medium, storing a computer program that when is executed by a processor, causes the processor to perform a packet transmission method comprising:

• receiving a first packet through a first port of a first virtual private LAN service (VPLS) instance executing on a first network device, wherein the first packet is to be sent to a first user-side device connected to a second network device;
• determining a first virtual private wire service (VPWS) instance executing on the first network device that has an association relationship with the first port of the first VPLS instance;
• and
• forwarding, using the first VPWS instance, the first packet to a second VPWS instance executing on the second network device, wherein the second network device is in the VPWS network, and wherein the first VPWS instance and the second VPWS instance bear a same service.