Abstract: A communication system includes a first communication device, a second communication device, a third communication device, and a relay device includes a memory, and a processor coupled to the memory and configured to, in a state where a first path through which the second communication device is coupled to the third communication device is established, when a coupling request command for establishing a second path through which the first communication device is coupled to the third communication device is received from the first communication device, establish the second path and cancel the first path in a case where the coupling request command that includes a forced switching instruction is detected.

Abstract: A communication control device, includes a memory; and a processor coupled to the memory and the processor configured to: store, in the memory, instructions of standby processing in a specific processing order, when a network coupling is being established to perform communication, acquire a specific instructions, update, in the memory, the instructions of standby processing based on a type of the specific instructions, a type of the instructions of standby processing and a relationship specified by order in which the specific instructions are acquired, and after an establishment of the network coupling is completed, perform the instructions of standby processing in a specific processing order.

Abstract: A communication control device, includes a memory; and a processor coupled to the memory and the processor configured to: store, in the memory, instructions of standby processing in a specific processing order, when a network coupling is being established to perform communication, acquire a specific instructions, update, in the memory, the instructions of standby processing based on a type of the specific instructions, a type of the instructions of standby processing and a relationship specified by order in which the specific instructions are acquired, and after an establishment of the network coupling is completed, perform the instructions of standby processing in a specific processing order.

Abstract: A relay device stores first logical-path information indicating information on communication logical paths used for communication between an information processing apparatus and an input and output device, where the communication logical paths each includes a device logical path used between the relay device and the input and output device. Upon detection of a mismatch between the first logical-path information and second logical-path information that is requested from the information processing apparatus and includes information on target communication logical paths to be used for communication between the information processing apparatus and the input and output device, the relay device controls setting of the device logical path included in each of the communication logical paths so that the communication logical paths are consistent with the target communication logical paths indicated by the second logical-path information.

Abstract: A relay device stores first logical-path information indicating information on communication logical paths used for communication between an information processing apparatus and an input and output device, where the communication logical paths each includes a device logical path used between the relay device and the input and output device. Upon detection of a mismatch between the first logical-path information and second logical-path information that is requested from the information processing apparatus and includes information on target communication logical paths to be used for communication between the information processing apparatus and the input and output device, the relay device controls setting of the device logical path included in each of the communication logical paths so that the communication logical paths are consistent with the target communication logical paths indicated by the second logical-path information.