Bit error information transfer method, network device, and communications system

A network device, comprising:

• a bit error detector configured to detect whether a bit error occurs on a first unidirectional link from another network device to the network device;
• a packet generator configured to generate an Intermediate System to Intermediate System (ISIS) packet comprising bit error information when detecting that a bit error occurs on the first unidirectional link, wherein the bit error information indicates that the bit error occurs on the first unidirectional link;
• and
• a transmitter configured to send the ISIS packet to the another network device.

A communications system, comprising:

• a first network device, comprising:
• a receiver configured to receive an Intermediate System to Intermediate System (ISIS) packet from another network device and that comprises bit error information, wherein the bit error information indicates that a bit error occurs on a first unidirectional link from the first network device to the another network device;
• and
• a processor coupled to the receiver and configured to perform traffic adjustment according to the bit error information such that the first network device subsequently sends data to the another network device using another link other than the first unidirectional link:
• and
• a second network device comprising:
• a bit error detector configured to detect whether a bit error occurs on a first unidirectional link from another network device to the first network device;
• a packet generator configured to generate an Intermediate System to Intermediate System (ISIS) packet comprising bit error information when detecting that a bit error occurs on the first unidirectional link, wherein the hit error information indicates that the bit error occurs on the first unidirectional link;
• and
• a transmitter configured to send the ISIS packet to the another network device.