Abstract: A network system, a node apparatus, a control apparatus, a communication control method, and a control method are provided that make it possible to easily perform control of a physical layer device required for flow control. In a communication system including a plurality of nodes constituting a network and a control apparatus controlling each node in units of flows, at least one communication interface is provided to each port of the nodes; the control apparatus instructs the node to set a physical layer mode on a port, and the node, in accordance with the physical layer mode indicated by the control apparatus, make setting of a corresponding communication interface.

Abstract: To detect a failure in a link or a failure in a network due to a frame loss between apparatuses, and degenerate a band in communication in which a frame is divided and divided frames are transmitted. A communication apparatus (100) includes a transmitter-receiver (101) configured to receive divided frames transmitted through a plurality of paths, the divided frame being obtained by dividing a frame, and a coupler (103) configured to couple the received divided frames, in which when the coupling of the received divided frames has failed in the coupler, the transmitter-receiver (101) transmits a signal-faulty signal indicating a transmission fault. When the communication apparatus (100) has failed in coupling frames, it can detect a failure in a link or a failure in a network due to a frame loss between apparatuses by transmitting a signal-faulty signal indicating a transmission fault.

Abstract: A communication system includes an Ethernet™ network and a MPLS-TP network connected with each other. A communication device transmits an OAM frame including frame type information showing that a frame type is an OAM frame, MPLS communication device identification information for identifying a communication device configuring the MPLS-TP network, and process content information showing a process content. When the type of a frame from the Ethernet network is an OAM frame, an edge device provides the frame with header information including an OAM identifier including MPLS communication device identification information included by the frame. When a communication device identified based on MPLS communication device identification information included by an OAM identifier of header information of a received frame is the device itself, a communication device executes an OAM process based on a process content shown by process content information.

Abstract: A relay apparatus includes a first control section which connects to a first network, a second control section which connects to a second network, the type of which is different from that of the first network, and a relay section which selects a path to be operated as an active system from the first network and the second network and switches paths based on information regarding the first network and information regarding the second network, wherein the second control section converts a transmission unit for transmission in the first network into a transmission unit for transmission in the second network, and transmits the transmission unit to the second network.

Abstract: A relay apparatus includes a first control section which connects to a first network, a second control section which connects to a second network, the type of which is different from that of the first network, and a relay section which selects a path to be operated as an active system from the first network and the second network and switches paths based on information regarding the first network and information regarding the second network, wherein the second control section converts a transmission unit for transmission in the first network into a transmission unit for transmission in the second network, and transmits the transmission unit to the second network.