Establishment of method and apparatus for implementing entry backup

A second network device, comprises a memory and a processor, wherein

• the memory is configured to store program code;
• and
• the processor is configured to run instructions in the program code, to cause the second network device to perform operations comprising:
• receiving a first BGP message sent by a first network device, wherein the first BGP message comprises first entry information, and the first entry information comprises information about a first entry stored in the first network device;
• and
• obtaining a second entry based on the first BGP message and storing information about the second entry, wherein the second entry is a backup entry of the first entry, and the information about the second entry comprises the first entry information,
• wherein the first BGP message comprises a route type field, and the route type field indicates that a type of a route advertised by the first BGP message is an entry backup route.

A first network device comprising a memory and a processor, wherein

• the memory is configured to store program code;
• and
• the processor is configured to run instructions in the program code, to cause the first network device to perform operations comprising:
• generating a first border gateway protocol (BGP) message, wherein the first BGP message comprises first entry information, and the first entry information comprises information about a first entry stored in the first network device, and wherein the first BGP message comprises a route type field, and the route type field indicates that a type of a route advertised by the first BGP message is the entry backup route;
• and
• sending the first BGP message to a second network device, wherein the first BGP message advertises an entry backup route to the second network device to enable the second network device to obtain a second entry based on the first BGP message, wherein information about the second entry comprises the first entry information, and the second entry is a backup entry of the first entry.