Path computation method, message responding method, and related device

A network device, wherein the network device is a first network device and comprises:

• a processor;
• and
• a non-transitory computer readable medium which contains computer-executable instructions,
• the processor is configured to execute the computer-executable instructions to perform operations comprising:
• sending path requirement information and a recomputation condition to a second network device, wherein:
• the path requirement information is used to enable the second network device to obtain, by means of computation, a path meeting a requirement and return first description information, wherein the first description information is description information of the path meeting the requirement;
• and the recomputation condition is associated with network performance and is used to enable the second network device to perform path recomputation and return second description information when the recomputation condition is met, wherein the second description information is description information of a path obtained by means of recomputation;
• and
• receiving the first description information and the second description information that are returned by the second network device.

A network device, wherein the network device is a second network device and comprises:

• a processor;
• and
• a non-transitory computer readable medium which contains computer-executable instructions,
• the processor is configured to execute the computer-executable instructions to perform operations comprising:
• receiving path requirement information from a first network device;
• computing a path meeting a requirement according to the path requirement information;
• sending first description information to the first network device, wherein the first description information is description information of the path that meets the requirement and that is obtained by means of computation;
• determining a recomputation condition is met, wherein the recomputation condition is associated with network performance;
• performing path recomputation when determining that the recomputation condition is met;
• and
• sending second description information to the first network device, wherein the second description information is description information of a path obtained by means of recomputation.