Network device synchronization method and network device

A network device, comprising:

• a non-transitory memory storing instructions;
• and
• a processor coupled to the non-transitory memory;
• wherein the instructions, when executed by the processor, cause the network device to be configured to:
• receive a first synchronization status message (SSM) and a second SSM, wherein
• the first SSM carries a first SSM code indicating a quality level of a first clock source and a first enhanced synchronization status message (eSSM) code indicating the quality level of the first clock source, and
• the second SSM carries a second SSM code indicating a quality level of a second clock source, the second SSM lacking an eSSM code indicating the quality level of the second clock source, and a value of the first SSM code being equal to a value of the second SSM code;
• and
• when a value of the first eSSM code is less than 0xFF, calibrate a frequency of the network device based on a timing signal of the first clock source.

A network device, comprising a first port, a second port, a processor, and a clock circuit, wherein the first port is coupled to the processor, the second port is coupled to the processor, the clock circuit is coupled to the first port, and the clock circuit is coupled to the second port;

• the first port is configured to receive a first SSM, wherein the first SSM carries a first SSM code indicating a quality level of a first clock source and a first eSSM code indicating the quality level of the first clock source;
• the second port is configured to receive a second SSM, wherein the second SSM carries a second SSM code indicating a quality level of a second clock source, the second SSM lacking an eSSM code indicating the quality level of the second clock source, and a value of the first SSM code being equal to a value of the second SSM code;
• the processor is configured to:
• when a value of the first eSSM code is less than 0xFF, instruct the first port to provide a timing signal of the first clock source for the clock circuit;
• and
• the clock circuit is configured to calibrate a frequency of the network device based on the timing signal of the first clock source.