| 摘要 |
In a communication device for monitoring a network system where a frame is transferred, with a maintenance frame for maintenance and management, an input-output section inputs or outputs a frame. A failure detection section detects occurrence of a failure in the network system on the basis of the inputted frame. A setting section sets the communication device according to the detection of the failure so as to terminate or transfer a data frame inputted from the input-output section. A data frame control section controls whether to terminate or transfer the data frame, according to the setting of the data frame by the setting section. A maintenance frame control section controls whether to terminate or transfer the maintenance frame inputted from the input-output section, according to the setting of the data frame by the setting section.
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