SILENT FAILURE DETECTION DEVICE AND SILENT FAILURE DETECTION METHOD

1 . A silent failure detection device comprising:

a memory; and

a processor coupled to the memory and configured to:

periodically acquire performance monitor information indicating a communication status from each of a plurality of network devices constituting a communication network; and

detect a silent failure occurring in the communication network based on the performance monitor information acquired,

wherein the processor is further configured to:

determine values of a plurality of failure determination parameters based on the performance monitor information; and

determine whether a silent failure has occurred in the communication network based on a failure determination score calculated from the values of the plurality of failure determination parameters.

2 . The silent failure detection device according to claim 1 , wherein the performance monitor information acquired from a first network device of the plurality of network devices includes first counter information indicating the number of packets discarded in a receive buffer of the first network device, second counter information indicating the number of packets discarded due to an error in the first network device, and third counter information indicating the number of packets discarded in a transmit buffer of the first network device.

3 . The silent failure detection device according to claim 1 ,

wherein the performance monitor information acquired from a first network device of the plurality of network devices includes counter information indicating the number of packets discarded in the first network device,

wherein the plurality of failure determination parameters include a first parameter indicating a frequency at which packets are discarded in the first network device and a second parameter indicating the number of packets discarded in the first network device, and

wherein the processor is further configured to:

increase a value of the first parameter as the frequency at which packets are discarded in the first network device increases;

increase a value of the second parameter as the number of packets discarded in the first network device increases; and

calculate the failure determination score by adding the value of the first parameter and the value of the second parameter; and

determine that a silent failure has occurred in the first network device or between the first network device and a counterpart device of the first network device when the failure determination score is greater than a predetermined threshold value.

4 . The silent failure detection device according to claim 3 ,

wherein the plurality of failure determination parameters further include a third parameter indicating the number of locations where packet discarding occurs in the first network device, and

wherein the processor is further configured to:

increase a value of the third parameter as the number of locations where packet discarding occurs in the first network device increases;

calculate the failure determination score by adding the value of the first parameter, the value of the second parameter, and the value of the third parameter; and

determine that a silent failure has occurred in the first network device or between the first network device and a counterpart device of the first network device when the failure determination score is larger than a predetermined threshold value.

5 . The silent failure detection device according to claim 3 , wherein the processor is further configured to:

calculate a difference between a number indicated by the counter information acquired immediately before and a number indicated by the counter information newly acquired, and

determine whether a silent failure has occurred in the communication network when the difference is not zero.

6 . A silent failure detection method comprising:

periodically acquiring performance monitor information indicating a communication status from each of a plurality of network devices constituting a communication network;

determining values of a plurality of failure determination parameters based on the performance monitor information acquired; and

determining whether a silent failure has occurred in the communication network based on a failure determination score calculated from the values of the plurality of failure determination parameters.