Methods for updating route, access device, and convergence device

An access device, comprising:

• a processor and a machine-readable storage medium;
• wherein the machine-readable storage medium stores machine-executable instructions executable by the processor;
• and
• the processor is configured to execute the machine-executable instructions to perform:
• receiving a first host route and a first sequence number of the first host route which are sent by a Border Gateway Protocol (BGP) peer of the access device;
• wherein the first sequence number is a basis for the BGP peer to determine the first host route to be sent;
• using the first host route as a route used by the access device to forward data to a host;
• and
• deleting a recorded Address Resolution Protocol (ARP) entry corresponding to the host, wherein an Internet Protocol (IP) address in the ARP entry and an IP address of the host are the same as a prefix in the first host route;
• wherein in deleting the recorded ARP entry, or after deleting the recorded ARP entry, the processor is further configured to execute the machine-executable instructions to perform:
• withdrawing a recorded third host route, wherein a type of the third host route is a specified type used to indicate that the third host route is generated based on ARP information in the ARP entry;
• and
• sending a route withdrawal message to the BGP peer of the access device, wherein the route withdrawal message is used to indicate that the third host route has been withdrawn.