Dcn packet processing method, network device, and network system

A network device, used as a first network device, wherein the first network device comprises:

• a memory comprising instructions;
• one or more processors coupled to the memory, wherein the instructions cause the first network device to be configured to:
• generate a first data communication network (DCN) packet, wherein a destination address of the first DCN packet is an IP address of a network management system (NMS), a next hop through which the first DCN packet passes to arrive at the destination address of the first DCN packet is a second network device, and the first network device and the second network device are connected by using a physical link;
• load the first DCN packet into a flexible Ethernet (Flex Ethernet) overhead multiframe;
• and
• send the Flex Ethernet overhead multiframe to the second network device over the physical link, so that the second network device extracts the first DCN packet from the Flex Ethernet overhead multiframe, and forwards the first DCN packet to the NMS.

A network device, used as a second network device, wherein the second network device comprises:

• a memory comprising instructions;
• one or more processors coupled to the memory, wherein the instructions cause the first network device to be configured to:
• receive a flexible Ethernet (Flex Ethernet) overhead multiframe sent by a first network device over a physical link, and extract a first data communication network (DCN) packet from the Flex Ethernet overhead multiframe, wherein a destination address of the first DCN packet is an IP address of a network management system (NMS), the second network device is a next hop through which the first DCN packet passes to arrive at the destination address of the first DCN packet, and the second network device and the first network device are connected by using the physical link;
• and
• send the first DCN packet to the NMS based on the destination address.