Communication device, communication system, setting method, setting program, and setting circuit

A setting method in a communication system performing supervision of a network status by transmitting and receiving supervision frames between maintenance entity group end point devices every predetermined time, wherein at least one communication device in the communication system comprises a management table for managing identification information of the maintenance entity group end point devices that are transmission sources of the supervision frames, the setting method comprising:

• receiving the supervision frames, by the communication device;
• and
• when identification information of one of the maintenance entity group end point devices that is a source of one of the received supervision frames is not registered in the management table, registering the identification information of the maintenance entity group end point device into the management table;
• measuring, by a timing unit for each of the identification information of the maintenance entity group end point devices registered in the management table, an elapsed time after reception of the supervision frame from the maintenance entity group end point device identified by the identification information;
• and
• deleting, by a deleting unit, for at least any of the identification information of the maintenance entity group end point devices registered in the management table when a supervision frame from the maintenance entity group end point device identified by the identification information is not received even though the elapsed time measured by the timing unit becomes equal to or more than a predetermined deletion threshold, the identification information of the maintenance entity group end point device from the management table.

A non-transitory computer-readable storage medium that stores a setting program of a communication device used for a communication system performing supervision of a network status by transmitting and receiving supervision frames between maintenance entity group end point devices every predetermined time, wherein the communication device comprises a management table for managing identification information of the maintenance entity group end point devices that are transmission sources of the supervision frames, the setting program comprising instructions for causing a computer of the communication device to execute a method, the method comprising:

• receiving the supervision frames;
• and
• when identification information of one of the maintenance entity group end point devices that is a source of one of the received supervision frames is not registered in the management table, registering the identification information of the maintenance entity group end point device into the management table;
• measuring, by a timing unit for each of the identification information of the maintenance entity group end point devices registered in the management table, an elapsed time after reception of the supervision frame from the maintenance entity group end point device identified by the identification information;
• and
• deleting, by a deleting unit, for at least any of the identification information of the maintenance entity group end point devices registered in the management table when a supervision frame from the maintenance entity group end point device identified by the identification information is not received even though the elapsed time measured by the timing unit becomes equal to or more than a predetermined deletion threshold, the identification information of the maintenance entity group end point device from the management table.