Network switch and link recovery method for dual-homing thereof

A network switch, comprising:

• a primary port, coupled to a first network device through a primary link;
• a backup port, coupled to a second network device through a backup link;
• a processing unit, configured to execute a program code;
• and
• a storage unit, coupled to the processing unit, configured to store the program code to indicate to the processing unit to execute a link recovery method for dual-homing, wherein the link recovery method comprises:
• receiving a plurality of first data packets via the backup port to obtain first packet information when the backup port is in a forwarding state;
• receiving a plurality of second data packets via the primary port to obtain second packet information in response to detecting an electrical signal from the primary link;
• comparing the second packet information with the first packet information to obtain a comparison result;
• and
• performing link change according to the comparison result;
• wherein the link recovery method further comprises switching the primary port to a learning state and receiving the plurality of second data packets via the primary port in response to detecting the electrical signal from the primary link.