Route advertisement method and device

A network device, wherein the network device is used in a network system comprising a first network device and a second network device, the first network device and the second network device establish a user datagram protocol (UDP)-based border gateway protocol (BGP) connection, the network device is the first network device, and the network device comprises:

• at least one processor;
• and
• at least one non-transitory computer-readable storage medium storing a program executable by the at least one processor, the program comprising instructions that, when executed by the at least one processor, cause the network device to:
• obtain one or more route sending groups, wherein each route sending group comprises one or more pieces of route information;
• separately generate at least one route advertisement message based on each route sending group, wherein each of the at least one route advertisement message comprises the one or more pieces of route information in the route sending group corresponding to the route advertisement message, wherein each of the one or more route sending groups is associated with a corresponding address family identifier, wherein each route sending group in the one or more route sending groups corresponds to one sending stream of the UDP-based BGP connection;
• and
• send the at least one route advertisement message to the second network device through the BGP connection.