Packet forwarding method, packet processing method, and device

A network device, applied to a second network device in a transport network, wherein the network device comprises:

• one or more memories storing instructions;
• and
• one or more processors coupled to the one or more memories and configured to execute the instructions, wherein executing the instructions causes the network device to:
• receive a second packet from a first device, wherein the second packet comprises network slice mapping information, and the first device is a network device in an access network or in a mobile core network, wherein the second packet has the network slice mapping information in a packet header, or comprises an encapsulated new packet header having the network slice mapping information and further comprises encapsulated data from a first packet;
• determine a corresponding network slice of the transport network based on the network slice mapping information;
• and
• send the second packet using a network resource corresponding to the network slice of the transport network.

A network system comprising:

• a first device in an access network or in a mobile core network;
• and
• a second device in a transport network;
• wherein the first device is configured to:
• obtain a first packet;
• determine network slice mapping information based on the first packet;
• generate a second packet based on the first packet, wherein the second packet comprises the network slice mapping information, wherein the second packet is generated by adding the network slice mapping information to a packet header of the first packet, or by generating a new packet header comprising the network slice mapping information and encapsulating the new packet header and data carried in the first packet into the second packet;
• and
• send the second packet to the second device;
• and
• wherein the second device is configured to:
• receive the second packet from the first device;
• determine a corresponding network slice of the transport network based on the network slice mapping information;
• and
• send the second packet using a network resource corresponding to the network slice of the transport network.