Faulty multi-layer link restoration method and controller

A controller comprising:

• a memory, configured to store computer readable instructions;
• a processor in communication with the memory, configured to execute the computer readable instructions to:
• determine that a fault occurs on a first multi-layer link passing through a first port on a first network device, wherein the first multi-layer link is a link in a link aggregation group between the first network device and a second network device;
• establish a second multi-layer link to restore the first multi-layer link, based on a first idle port on the first network device and a second idle port on a target network device;
• and
• add the second multi-layer link to a target link aggregation group between the first network device and the target network device.

A non-transitory computer-readable storage media storing instructions which upon execution by a computer system perform steps comprising:

• determining that a fault occurs on a first multi-layer link passing through a first port on a first network device, wherein the first multi-layer link is a link in a link aggregation group between the first network device and a second network device;
• establishing a second multi-layer link used for restoration of the first multi-layer link, based on a first idle port on the first network device and a second idle port on a target network device;
• and
• adding the second multi-layer link to a target link aggregation group between the first network device and the target network device.