Packet processing method, device, and system

A method for processing packet, comprising:

• receiving, by a source node of a path, a service label corresponding to a service processing manner of a forwarding equivalence class (FEC) and the path;
• receiving, by a destination node of the path, a mapping relationship between the service label and the service processing manner;
• receiving, by the source node, a first packet;
• inserting the service label to the first packet to generate a second packet;
• and
• sending, by the source node, the second packet to the destination node corresponding to the path, wherein the service label is used to instruct a network node on the path to perform service processing on the second packet according to the service processing manner;
• and
• receiving the second packet at the destination node, wherein the destination node is enabled, based on the mapping relationship, to pop the service label from the second packet to obtain the first packet.

A controller, comprising:

• at least one processor;
• one or more memories coupled to the at least one processor and storing instructions, which when by the at least one processor, cause the controller to:
• allocate a service label corresponding to a service processing manner of a forwarding equivalence class (FEC) and a path;
• establish a mapping relationship between the service label and the service processing manner;
• send the service label to a source node of the path to enable the source node to insert the service label to a first packet to obtain a second packet to be forwarded along the path to a destination node, wherein the service label is used to instruct a network node on the path to perform service processing on the second packet according to the service processing manner;
• and
• send the mapping relationship to the destination node, wherein the destination node is enabled to pop the service label from the second packet to obtain the first packet based on the mapping relationship.

A source node device, comprising:

• at least one processor;
• one or more memories coupled to the at least one processor and storing instructions, which when executed by the at least one processor, cause the at least one processor to:
• receive a service label corresponding to a service processing manner of a forwarding equivalence class (FEC) and a path, wherein the source node device is a source node of the path;
• receive a first packet;
• insert the service label to the first packet to generate a second packet;
• and
• send the second packet to a destination node corresponding to the path, wherein the service label is used to instruct a network node on the path to perform service processing on the second packet according to the service processing manner, and wherein the destination node is enabled to pop the service label from the second packet to obtain the first packet based on a mapping relationship between the service label and the service processing manner.