Abstract: The present invention discloses a method including the steps of a) confirming the status of a path corresponding to each node apparatus in the ring network by using a predetermined control information that includes a function of adding/deleting a predetermined path on a physical layer, b) instructing each node apparatus to add/delete the predetermined path by using the predetermined control information when the status of the path corresponding to each node apparatus is confirmed to be normal, c) reporting completion of the addition/deletion of the predetermined path to each node apparatus by using the predetermined control information when the addition/deletion of the predetermined path is adequately performed by each node apparatus, and d) reporting the addition/deletion of the predetermined path to a ring application function included in the ring application of the data link layer when the completion of the addition/deletion of the predetermined path is adequately reported by each node apparatus.

Abstract: A network device provided with an Ethernet interface for interconnecting with another network device by auto negotiation, the network device comprising a link establishing function unit compulsorily establishing a link with the other network device and an on/off setting function unit setting the function of the link establishing function unit on or off and the link establishing function unit being comprised of a data transmission suppressing unit for suppressing the transmission of user data to the other network device until the sequence based on the auto negotiation is finished, whereby the problem of connectivity where the sequence of the auto negotiation repeats and no link can be established is solved.

Abstract: An RPR transmission route designation method and apparatus in a system including a control device connected to an RPR having communications routes in both the counterclockwise and clockwise directions and connecting a plurality of RPR stations, wherein each RPR station sets a cleave point for discarding flooded RPR frames in the case of a bidirectional communication system on a route not desired for use for communication on the RPR, floods both the counterclockwise and clockwise directions of the RPR with RPR frames to learn the MAC address at each RPR station, and transmits the received RPR frames by a communication route which the flood of RPR frames reach based on the learned results of the MAC addresses, whereby it is possible to designate RPR transmission routes supported by layer 2/3 switches, transmission devices, and the like in line with the carrier operations.

Abstract: The present invention discloses a method including the steps of a) confirming the status of a path corresponding to each node apparatus in the ring network by using a predetermined control information that includes a function of adding/deleting a predetermined path on a physical layer, b) instructing each node apparatus to add/delete the predetermined path by using the predetermined control information when the status of the path corresponding to each node apparatus is confirmed to be normal, c) reporting completion of the addition/deletion of the predetermined path to each node apparatus by using the predetermined control information when the addition/deletion of the predetermined path is adequately performed by each node apparatus, and d) reporting the addition/deletion of the predetermined path to a ring application function included in the ring application of the data link layer when the completion of the addition/deletion of the predetermined path is adequately reported by each node apparatus.

Abstract: A network device provided with an Ethernet interface for interconnecting with another network device by auto negotiation, the network device comprising a link establishing function unit compulsorily establishing a link with the other network device and an on/off setting function unit setting the function of the link establishing function unit on or off and the link establishing function unit being comprised of a data transmission suppressing unit for suppressing the transmission of user data to the other network device until the sequence based on the auto negotiation is finished, whereby the problem of connectivity where the sequence of the auto negotiation repeats and no link can be established is solved.