Communication device, communication system, and communication method

A communication system comprising:

• a plurality of ports configured to transmit and receive frames to and from a device;
• a switching unit configured to transfer the frames to another port based on identification information of the frames;
• a plurality of reception processing units configured to individually receive the frames transferred from the switching unit;
• a detection unit configured to detect a failure with the device;
• a duplication processing unit configured to duplicate the frames, individually assign the identification information indicating a corresponding port to a plurality of duplicated frames and output the plurality of duplicated frames to the switching unit;
• and
• a control unit configured to perform control in accordance with control information included in one duplicated frame of the plurality of duplicated frames.

A communication method comprising:

• transferring frames to another port through a switching unit based on identification information of frames received through at least one port of a plurality of ports that transmit and receive the frames to and from another device;
• duplicating the frames, individually assigning the identification information indicating a corresponding port to a plurality of duplicated frames, and outputting the plurality of duplicated frames to the switching unit;
• and
• performing control in accordance with control information included in one duplicated frame of the plurality of duplicated frames.