Packet sending method, network device, and system

A network device, comprising:

• 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 execution of the instructions causes the network device to:
• receive an advertisement message sent by a second network device, wherein the advertisement message comprises segment routing (SR) policy information and traffic feature information, and the SR policy information comprises a segment identifier (SID) list;
• and
• establish a correspondence between the traffic feature information and the SID list according to the advertisement message, wherein the correspondence is used to guide forwarding of a packet comprising the traffic feature information.

A network device, comprising:

• 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 execution of the instructions causes the network device to:
• generate an advertisement message, wherein the advertisement message comprises segment routing (SR) policy information and traffic feature information, and an SR policy comprises a segment identifier (SID) list;
• and
• send the advertisement message to a first network device, wherein the advertisement message directs the first network device to establish a correspondence between the traffic feature information and the SID list, and the correspondence is used to guide forwarding of a packet comprising the traffic feature information.

A network system comprising a first network device and a second network device,

• wherein the first network device and the second network device each comprise:
• 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 the instructions of the first network device configure the first network device to:
• receive an advertisement message sent by the second network device, wherein the advertisement message comprises segment routing (SR) policy information and traffic feature information, and the SR policy information comprises a segment identifier (SID) list;
• and
• establish a correspondence between the traffic feature information and the SID list according to the advertisement message, wherein the correspondence is used to guide forwarding of a packet comprising the traffic feature information;
• wherein the instructions of the second network device configure the second network device to:
• generate the advertisement message;
• and
• send the advertisement message to the first network device.