JP4966761B2 - Transmission path system, node and node information duplication judgment method - Google Patents

Description

  The present invention relates to a technique for determining whether or not a node having information overlapping with information of a new node joining a transmission path system already exists in the transmission path system.

  The transmission line system is configured by connecting a plurality of nodes so that they can communicate with each other. Each node constituting this transmission line system has respective information (hereinafter referred to as “node information”), and performs communication using the node information. Therefore, the node information is desirably information that can be uniquely identified in the transmission line system.

  However, in practice, node information may be duplicated in a plurality of nodes constituting the transmission line system. For example, a node address can be used as node information. For example, when a node address such as an IP (Internet Protocol) address or a MAC (Media Access Control) address is used, Address may be duplicated.

In order to avoid a situation in which node information is duplicated, for example, a node that is powered on acquires the address of its neighboring node, and a master node included in the transmission line system is A technology is disclosed in which the address of the node and the address of the adjacent node are acquired and it is determined whether or not both addresses are duplicated (see, for example, Patent Document 1).
JP 2000-92100 A

  However, in the technique described in Patent Document 1 described above, in order to determine whether or not a node having information overlapping with the information of a newly joined node to the transmission line system already exists in the transmission line system, It is necessary for the master node to repeatedly execute the process of acquiring the address of the node and the address of the adjacent node from the node to which power is turned on and determining whether or not both addresses are duplicated. Therefore, there is a problem in that it is not possible to efficiently determine whether or not a node having information that overlaps with information of a newly added node to the transmission line system already exists in the transmission line system.

  Therefore, the present invention has an object to efficiently determine whether or not a node having information overlapping with information of a new joining node to a transmission line system to which a plurality of nodes are connected already exists in the transmission line system. And

  In order to solve the above-mentioned problem, a transmission line system according to the present invention is configured such that a plurality of nodes including a management node and one or more managed nodes are connected via a transmission line, and the one or more managed nodes are the own nodes. Information to the management node, and when the management node receives the information of the new joining node from the new joining node that newly joins the transmission line system, the configuration information that is the node information received from one or more managed nodes is received. It is determined whether or not at least one of the included node information and the newly joined node information overlap.

  According to the present invention, it is possible to efficiently determine whether or not a node having information overlapping with information on a newly joined node to a transmission line system to which a plurality of nodes are connected already exists in the transmission line system. Is possible.

<First Embodiment>
First, the first embodiment will be described. In the first embodiment, a case where a transmission line system is formed by connecting a plurality of nodes in a ring shape will be described as an example. However, the shape of the transmission line system is not limited to the ring shape, and may be another shape. In the following description, the information of the nodes constituting the transmission path system is referred to as configuration information. When a transmission path system is formed by connecting a plurality of nodes in a ring shape, this configuration information Is particularly referred to as a ring map.

FIG. 1 is a diagram showing a logical basic concept of a transmission line system according to the first embodiment, here, a bidirectional double ring type transmission line system. FIG. The state (b) shows the state after the connection of the new joining node. Note that the thick arrows in FIG. 1 schematically show data exchange.
In FIG. 1A, reference numerals 1 to 6 denote nodes as frame transmission apparatuses, and each node is assigned a unique node number. These are assigned around the A system (clockwise) and around the B system. A network is constructed by appropriately connecting through two (counterclockwise) transmission lines 9 and 10.
In FIG. 1A, reference numeral 1 denotes a management node (master node), which is a node that blocks transmission (indicated by a thumbprint in the figure) on the second port (port B) side. Therefore, in the management node 1, the first port (port A) side is called the inside of the network, and the port B side is called the outside of the network. In the management node 1, frame transmission is performed only on the port A side.

Reference numerals 2 to 6 are all managed nodes (slave nodes). Reference numeral 2 denotes a node at which the managed node 2 terminates the transmission path 10 around the B system (counterclockwise). In the managed node 2, the port B side is called the inside of the network, and the port A side is called the outside of the network. In the B terminal station 2, the frame is transmitted only on the port B side. The managed nodes 3 to 6 are nodes that can transmit frames to both the transmission path 9 around the A system (clockwise) and the transmission path 10 around the B system (counterclockwise). The managed nodes 3 to 6 are both connected to the network in both the port A and the port B, and frame transmission is performed bidirectionally on both the port A side and the port B side.
Reference numerals 7 and 8 denote terminals (PC: Personal Computer) (computers) connected to the management node 1 and the managed nodes 2 to 6. The terminals 7 and 8 generate user frames and exchange data using the transmission path 9 around the A system (clockwise) or the transmission path 10 around the B system (counterclockwise).

  In FIG. 1B, a symbol X is a node as a frame transmission apparatus, and is a node (new joining node) that intends to newly join the transmission path system. Here, the new joining node X is arranged between the managed node 3 and the managed node 4, but may be arranged between any nodes. In addition, here, the new subscription node X and the managed node 3 are connected, and the new subscription node X and the managed node 4 are connected. However, the managed node 3 and the managed node 3 are connected. In this state, the newly joined node X may be configured to be able to communicate with at least one of the managed node 3 and the managed node 4. A symbol Y is a terminal (computer) connected to the new joining node X.

  As described above, in the first embodiment, a plurality of nodes including the management node 1 and one or more managed nodes (managed nodes 2 to 6 in the example shown in FIG. 1A) are used as transmission paths. To form a transmission line system.

  FIG. 2 is a diagram illustrating the types of frames transmitted and received in the transmission line system according to the first embodiment. In the figure, a broken line indicates a ring image of the ring type transmission line.

  The user frame c includes not only a frame flowing from a local area network (LAN) (not shown) but also a TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) frames transmitted and received by the own node.

  The ring map generation frame d is used as a ring map generation frame for generating a ring map that is information regarding a plurality of nodes.

  The ring map transfer frame e is used to transfer the completed ring map to another station.

  FIG. 3 is a diagram illustrating a data format of a frame used in the transmission line system according to the first embodiment. (A) a ring map generation frame, a duplicate check request frame, (b) a ring map transfer frame, (C) Each user frame is shown.

As shown in FIG. 3A, the ring map generation frame and the duplicate check request frame are based on the destination address, source address, tag, frame length / type, data area, and CRC (Cyclic Redundancy Check) fields. Composed. Also, as shown in FIG. 3B, the ring map transfer frame includes fields of a destination address, a source address, a tag, a frame length / type, a data area, and a CRC.
The frame identification number assigned to the data area is used to identify the frame, and the control information is assigned to one of the frames according to the priority assigned as the control information when the frames compete. Information used to validate. The tag is used for identification for assigning an arbitrary port to a plurality of VLANs (Virtual LANs). The above-described ring map transfer frame is identified by a unique destination address value. Further, the ring map generation frame and the duplicate check request frame are identified by the value of the frame identification number.

  Also, as shown in FIG. 3C, the user frame is composed of fields of destination address, transmission source address, frame length / type, data area, and CRC.

FIG. 4 is a block diagram showing an internal configuration of the data transmission apparatus according to the first embodiment, and specifically shows an internal configuration of each of the nodes 1 to 6 and X shown in FIG.
The data transmission apparatus according to the first embodiment includes a port A (11), a port B (12), a frame control unit 22, a ring map control unit 19, a ring map holding unit 20, and a duplication check control unit 21. It consists of. The frame control unit 22, the ring map control unit 19, the ring map holding unit 20, and the duplication check control unit 21 function as a processing unit. Port A (11) and port B (12) function as a communication unit.

The frame control unit 22 outputs the ring map generation frame received via the port A (11) to the ring map control unit 19, and the ring map generation frame to which the information of the own node is added from the ring map control unit 19 Is returned, the returned ring map generation frame is transmitted via the port B (12).
Further, the frame control unit 22 outputs the ring map described in the ring map transfer frame received via the port B (12) to the ring map holding unit 20, and also transmits the received ring map transfer frame to the port map. Transmit via A (11).
Further, when the ring map transfer frame is input from the ring map control unit 19, the port state control unit 13 transmits the input ring map transfer frame via the port A (11).
Further, the frame control unit 22 outputs information on the transmission source node described in the duplication check request frame received via the port A (11) or the port B (12) to the duplication check control unit 21.

  The ring map control unit 19 performs processing based on the state of the own node. That is, when the state of the own node is a managed node, when the ring map generation frame is input from the frame control unit 22, the ring map control unit 19 adds the own node to the input ring map generation frame. Is added to the frame controller 22 and output to the frame controller 22.

  When the own node is a management node, when the ring map generation frame is input from the frame control unit 22, the ring map control unit 19 rings the ring map described in the input ring map generation frame. Output to the map holding unit 20. Further, the ring map control unit 19 may further generate a ring map transfer frame in which the completed ring map is described and output it to the frame control unit 22. As a result, the ring map transfer frame can be transmitted to other nodes, and some or all of the nodes that have received the ring map transfer frame internally retain the ring map described in the ring map transfer frame. It becomes possible to do. If the ring map is held inside the node, the terminal 7 (8) (see FIG. 1A) connected to the node can display the ring map on a display device (not shown). Thus, the administrator can grasp configuration information indicating what kind of node the network is configured by referring to a ring map displayed on a display device (not shown).

  When the own node is the management target nodes 3 to 6, when the ring map generation frame is input from the frame control unit 22, the ring map control unit 19 adds the ring map generation frame to the input ring map generation frame. Information is added and output to the frame control unit 22.

  When the own node is the management target node 2, the ring map control unit 19 generates a ring map generation frame, for example, every predetermined time (for example, every 3 seconds), and generates the generated ring map. The node information is added to the generation frame and output to the frame control unit 22.

  Here, when the state of the own node is the management node and the management target node, the information of the own node added to the ring map generation frame is not particularly limited. For example, the MAC address (Media Access Control address) ), An IP address (Internet Protocol address), or the like, or a node number. Moreover, the information (for example, a MAC address, an IP address, etc.) of the terminal 7 (8) (see FIG. 1A) connected to the own node may be used. The area to which the information of the own node is added may be anywhere in the ring map generation frame, but may be a data area (see FIG. 3A), for example. In each node, it is preferable to add the information of the own node to the ring map generation frame after the information of other nodes. As a result, the administrator can grasp the connection order of the nodes together with the configuration information described above.

  When a ring map is input from the frame control unit 22, the ring map holding unit 20 stores the input ring map inside (for example, a storage unit (not shown) in the own node).

  The duplication check control unit 21 performs duplication check on the information of the transmission source node of the duplication check request frame input from the frame control unit 22. That is, the duplication check control unit 21 has at least one of the information of the transmission source node of the duplication check request frame input from the frame control unit 22 and the information of the node included in the ring map stored inside the node. It is determined whether or not there are duplicates.

  Further, the duplication check control unit 21 generates a duplication check request frame in accordance with a predetermined instruction, and sets information of the own node in the generated duplication check request frame (in the example of FIG. 3A, the duplication check request frame A node that can communicate the duplicate check request frame in which the information of the own node is set (the source address is set as the source address) (in FIG. 1B, at least one of the managed nodes 3 and 4) To any one). The predetermined instruction is obtained by, for example, outputting an overlap check instruction input from the terminal Y (FIG. 1B) by the administrator to the overlap check control unit 21 of the new joining node (FIG. 1B). Given. The information on the own node is not particularly limited, and may be the address of the own node such as a MAC address or an IP address, or may be other information for specifying the own node. Moreover, the information of the terminal Y (refer FIG.1 (b)) connected to the own node may be sufficient. The area to which the information of the own node is added may be anywhere in the duplicate check request frame.

  FIG. 6 is a diagram showing operations of ring map generation, ring map transfer, and node information duplication check in the transmission line system according to the second embodiment. Both are shown based on the physical configuration of the transmission line system of the present invention shown in FIG. In FIG. 6, “そ れ ぞ れ” indicates each of the blocking (logical disconnection) states. In the figure, the numbers # 1 to # 6 and #X assigned to the nodes correspond to the numbers 1 to 6 and X of the ports shown in FIG.

  Hereinafter, the operations of ring map generation, ring map transfer, and node information duplication check in the transmission line system according to the first embodiment will be described in detail with reference to FIG.

  As shown in FIG. 6A, the node # 2, which is the management target node, generates a ring map generation frame every predetermined time, for example, and adds the information of the own node to the generated ring map generation frame And transmit in one direction (around system A). When nodes # 3 to # 6, which are managed nodes, receive the ring map generation frame, they add their own node information to the received ring map generation frame and transmit it in one direction (around the A system). Node # 1, which is the management node, receives the ring map generation frame.

  As shown in FIG. 6 (b), the node # 1, which is the management node, further transmits another ring map transfer frame describing the completed ring map in the other direction (around the B system). A ring map may be held in a part or all of the nodes. For example, when all other nodes hold the ring map, the node # 1, which is the management node, transmits the ring map transfer frame in the other direction (around the A system) by multicast. Upon receiving the ring map transfer frame, the managed nodes (nodes # 3 to # 6) store the ring map described in the received ring map transfer frame inside (for example, a storage unit (not shown) in its own node) ) And the received ring map transfer frame is transferred in the other direction (around the B system). When receiving the ring map transfer frame, the management target node (node # 2) stores the ring map described in the received ring map transfer frame inside (for example, a storage unit (not shown) in the own node).

  As shown in FIG. 6C, it is assumed that the newly joined node (node #X), the management target node # 3, and the management target node # 4 are communicably connected. The new joining node (node #X) generates a duplication check request frame, sets the information of the own node in the generated duplication check request frame, and sets the duplication check request frame in which the information of the own node is set as the management target node # 3. And transmitted to at least one of the managed nodes # 4. The node that has received the duplication check request frame performs duplication check on the information of the transmission source node set in the received duplication check request frame. That is, it is determined whether or not the information of the transmission source node of the received duplication check request frame and at least one of the node information included in the ring map stored inside the node are duplicated.

  When the node that has received the duplicate check request frame determines that at least one of the information (configuration information) of nodes that have already joined the transmission path system and the information of the newly joined node are duplicated, for example, It is possible to perform processing such as not allowing a new joining node to join the transmission path system. That is, when it is determined that at least one of the node information included in the configuration information does not overlap with the information of the new joining node, the new joining node can be joined to the transmission line system. For example, each node constituting the transmission path system registers information on the new subscription node as a communication destination node.

  Further, when the node that has received the duplicate check request frame determines that at least one of the node information included in the configuration information and the information of the newly joined node are duplicated, via the newly joined node, It is good also as notifying a duplication error with respect to the terminal connected to the newly joined node. As a result, the manager who has received the notification of the duplicate error via the terminal can perform the work of canceling the subscription of the new joining node to the transmission line system.

  As in the example shown above, when a node constituting a transmission path system receives information on a new joining node from a new joining node that newly joins the transmission path system, at least at least one piece of node information included in the ring map is included. It was decided whether or not the information of one and the newly joined node was duplicated. As a result, it is possible to efficiently determine whether or not a node having information overlapping with the information of a newly joined node to the transmission line system to which a plurality of nodes are connected already exists in the transmission line system. . Such a determination can be performed if the node holds the ring map therein. That is, the determination can be made in the management node or the management target node to which the ring map is transferred.

  It can also be determined in a managed node that does not hold a ring map. In other words, when the managed node receives information on a newly joined node from a newly joined node that newly joins the transmission path system, a ring map transmission request that prompts the management node to send a ring map may be transmitted. Then, when the management node receives the ring map transmission request, it transmits the ring map around the B system, thereby transferring the ring map to the transmission source node of the ring map transmission request. It is possible to determine whether or not at least one of the node information included in the received ring map overlaps with the information of the newly joined node.

  Further, as described above, the shape of the transmission line system is not limited to a ring shape, and may be a bus shape, a star shape, a tree shape, or a mesh shape, for example. In this case, as in the case of the ring shape, a plurality of nodes including a management node and one or more managed nodes are connected via a transmission path, and the one or more managed nodes manage information of the own node. Send to. When one or more managed nodes transmit information of the own node to the managed node, the managed nodes may generate the information of the own node and describe and transmit the information of the own node. It is also possible to add the information of the own node to the frame generated by the node and transmit it.

  Then, when the management node or the managed node receives the information of the newly joined node from the newly joined node that newly joins the transmission line system, the managed node and the managed node of the node information included in the information (configuration information) of one or more nodes It is determined whether at least one and the information of the newly joined node are duplicated.

  It can also be determined in a managed node that does not hold configuration information internally. In other words, when the managed node receives information on a newly joined node from a newly joined node that newly joins the transmission path system, a configuration information transmission request that prompts the management node to send configuration information may be transmitted. Then, when the management node receives the configuration information transmission request, it transmits the configuration information around the B system, thereby transferring the configuration information to the transmission source node of the configuration information transmission request. It is possible to determine whether or not at least one of the node information included in the received configuration information and the information of the newly joined node overlap.

  Further, the functions of the ring map control unit 19, the ring map holding unit 20, the duplication check control unit 21, and the frame control unit 22 shown in FIG. 4 are realized by a program, and the program is stored on a computer-readable recording medium. The bi-directional double ring transmission line system and the frame transmission apparatus can also be constructed by storing and sequentially reading and executing the program by a CPU (Central Processing Unit) serving as a control center of each node.

Second Embodiment
Next, the second embodiment will be described. In the transmission line system according to the second embodiment, a plurality of nodes are connected in a ring shape. Then, the state of each node is dynamically determined as will be described later.

FIG. 7 is a diagram showing a logical basic concept of a transmission line system according to the second embodiment, here, a bidirectional double ring type transmission line system. The state (b) shows the state after the connection of the new joining node. In addition, the thick line arrow in FIG. 7 shows data exchange typically.
In FIG. 7A, reference numerals 1 to 6 denote nodes as frame transmission apparatuses, each of which is assigned a unique node number and a node state, and these are assigned around the A system (clockwise). ), A network is constructed by appropriately connecting through two transmission lines 9 and 10 around the B system (counterclockwise).
In FIG. 7 (a), reference numeral 1 is one terminal state (master node) (hereinafter referred to as A terminal station), which blocks transmission on the second port (port B) side (indicated by thumbprints in the figure). Node to show). For this reason, in the A terminal station 1, the first port (port A) side is called the inside of the network, and the port B side is called the outside of the network. In the A terminal station 1, frame transmission is performed only on the port A side. Reference numeral 2 denotes the other terminal state (terminal station node) (hereinafter referred to as B terminal station), which is a node that terminates the transmission line 10 around the B system (counterclockwise). In the B terminal station 2, the port B side is called the inside of the network, and the port A side is called the outside of the network. In the B terminal station 2, the frame is transmitted only on the port B side.

Reference numerals 3 to 6 are intermediate stations, and frames can be transmitted to both the transmission path 9 around system A (clockwise) and the transmission path 10 around system B (counterclockwise). It is a node. The intermediate stations 3 to 6 are both connected to the network in the ports A and B, and frame transmission is performed bidirectionally on both the port A side and the port B side.
Reference numerals 7 and 8 denote terminals (PC: personal computer) (computers) connected to the nodes assigned as the A terminal station 1, the B terminal station 2, and the intermediate stations 3 to 6, respectively. The terminals 7 and 8 generate user frames and exchange data using the transmission path 9 around the A system (clockwise) or the transmission path 10 around the B system (counterclockwise).

  In FIG. 7B, a symbol X is a node as a frame transmission apparatus, and is a node (new joining node) that intends to newly join the transmission path system. Here, the newly joined node X is arranged between the intermediate station 3 and the intermediate station 4, but may be arranged between any of the nodes. Also, here, the new subscription node X and the intermediate station 3 are connected, and the new subscription node X and the intermediate station 4 are connected. However, the intermediate station 3 and the intermediate station 4 are connected. In this state, the new joining node X may be configured to be able to communicate with at least one of the intermediate station 3 and the intermediate station 4. A symbol Y is a terminal (computer) connected to the new joining node X.

FIG. 8 is a diagram illustrating the types of frames transmitted and received in the transmission line system according to the second embodiment. In the figure, a broken line indicates a ring image of the ring type transmission line.
Here, in addition to the user frame c transmitted between the A terminal station and the B terminal station, the inter-adjacent frame a as a first control frame used between adjacent nodes, and the A terminal station are generated. A network control frame b is prepared as a second control frame for network control, which is multicast transmitted in the network and finally returned (received) to the A terminal station.

  Note that the user frame c includes a TCP (Transmission Control Protocol) and a UDP (User Datagram Protocol) frame transmitted and received by the own node as well as a frame flowing from a branch area LAN (Local Area Network) (not shown).

The inter-adjacent frame a is used as a frame for confirming the soundness (disconnection, connection) of the transmission path between adjacent nodes. Specifically, each of the nodes 1 to 6 in FIG. 7 (a) notifies each other of the current local station state by exchanging frames between adjacent nodes and performs handshaking with the adjacent nodes on both sides. Yes. Here, the state in which the logical handshake with the adjacent node is completed is defined as link up. With this inter-adjacent frame, transmission path fault monitoring and transmission quality degradation are monitored.
The ring map generation frame d is used as a ring map generation frame for generating a ring map that is information regarding a plurality of nodes.
The network control frame b includes a contention start trigger frame, a failure adjacent A declaration frame, a failure adjacent A transition frame, and a failure adjacent A transition response frame.

The contention start trigger frame is used to arbitrate one or more A terminal stations existing in the network to one node. Specifically, a plurality of A terminal stations compete with each other at the time of failure recovery, and have a priority. Based on the arbitration based on this, it becomes an opportunity to arbitrate one or more A terminal stations to one node.
The failure adjacent A declaration frame is used to declare that the own station is the failure adjacent A terminal station. Specifically, since the own station has the highest priority as the A terminal station, the contention start trigger The contention is canceled in response to the contention request by the frame, and the other node requests to transit to the intermediate station.
The failure adjacent A transition frame is used to declare that the own station has transitioned to the failure adjacent A terminal station. Specifically, since the own station has the highest priority as the A terminal station, the contention start trigger frame is used. The contention request is canceled and the other node requests to transit to the intermediate station.
The failure adjacent A transition response frame is used as a response frame for the node that has transmitted the failure adjacent A transition frame. Specifically, the failure adjacent A transition response frame is a failure adjacent A transition frame transmitted by the failure adjacent A terminal station. Is transmitted to the B terminal station, and thereby, a transmission path between the A terminal station and the B terminal station can be secured.
The ring map transfer frame e is used to transfer the completed ring map to another station.

  FIG. 9 is a diagram showing a data format of a frame used in the transmission line system according to the second embodiment. (A) Inter-adjacent frame, ring map generation frame, duplicate check request frame, (b) network control Each of a frame, a ring map transfer frame, and (c) a user frame is shown.

As shown in FIG. 9A, the inter-adjacent frame is composed of fields of a destination address, a transmission source address, a tag, a frame length / type, a data area, and a CRC (Cyclic Redundancy Check). Also, as shown in FIG. 9B, the network control frame is composed of fields of destination address, transmission source address, tag, frame length / type, data area, and CRC.
The frame identification number assigned to the data area is used to identify the contention start trigger frame, the failure adjacent A declaration frame, the failure adjacent A transition frame, and the failure adjacent A transition response frame. This is information used to validate any one frame according to the priority assigned as control information when the frames compete. The tag is used for identification for assigning an arbitrary port to a plurality of VLANs (Virtual LANs). Further, the above-described inter-adjacent frame, network control frame, and ring map transfer frame are identified by a unique destination address value. Further, the ring map generation frame and the duplicate check request frame are identified by the value of the frame identification number.

Further, as shown in FIG. 9C, the user frame is configured by fields of a destination address, a transmission source address, a frame length / type, a data area, and a CRC.
Note that the inter-adjacent frame and the network control frame are transmitted using multicast. Therefore, as each of the nodes 1 to 6 and X in FIG. 7B, a node having a VLAN function for virtually dividing a multicast domain into a plurality of nodes is used.

FIG. 10 is a block diagram showing the internal configuration of the data transmission apparatus according to the second embodiment, and specifically shows the internal configuration of each of the nodes 1 to 6 and X shown in FIG. 7B.
The data transmission apparatus according to the second embodiment includes a port A (11), a port B (12), a port state control unit 13, a reception buffer 14, a reception frame control unit 15, a transmission buffer 16, and a transmission. The frame control unit 17, the network control unit 18, the ring map control unit 19, the ring map holding unit 20, and the duplication check control unit 21 are configured. The port state control unit 13, the reception frame control unit 15, the transmission frame control unit 17, the network control unit 18, the ring map control unit 19, the ring map holding unit 20, and the duplication check control unit 21 function as a processing unit. Port A (11) and port B (12) function as a communication unit.

The port state control unit 13 exchanges adjacent frames between adjacent nodes 1 to 6 to perform handshaking periodically, and transmission paths 9 and 10 around the A system and the B system (FIG. 7A). Monitor for failures.
The port state control unit 13 determines the destination address of the inter-adjacent frame or the network control frame received via the port A (11) and the port B (12), and determines the port B (12) and the port A. Whether to forward or block the transmission of the inter-adjacent frame or network control frame for (11) is determined and stored in the reception buffer 14 via the reception frame control unit 15.

Further, the port state control unit 13 outputs the ring map generation frame received via the port B (12) to the ring map control unit 19, and the ring map to which the information of the own node is added from the ring map control unit 19 When the generation frame is returned, the returned ring map generation frame is transmitted via the port A (11).
Further, the port state control unit 13 outputs the ring map described in the ring map transfer frame received via the port A (11) to the ring map holding unit 20, and also receives the received ring map transfer frame. Transmit via port B (12).
Further, when the ring map transfer frame is input from the ring map control unit 19, the port state control unit 13 transmits the input ring map transfer frame via the port B (12).
Further, the port state control unit 13 outputs information on the transmission source node described in the duplication check request frame received via the port A (11) or the port B (12) to the duplication check control unit 21.

  The network control unit 18 receives a network control frame transmitted by multicast using the transmission path 9 around the A system from the node that transitions to the faulty adjacent A terminal station when the failure of the transmission path 9 (10) is detected. A single A terminal station determined by arbitrating one or more A terminal stations that block transmission of user frames using the port B (12), and adjacent to the only A terminal station, Transmission is performed by port B, and a transmission path is reestablished between the node that transitions to the faulty adjacent B terminal station that terminates the transmission path 10 around the B system.

  Further, the network control unit 18 uses the frame identification number included in the network control frame stored in the reception buffer 14 so that the network control frame is transmitted around the transmission line 9 (10) around the A system or the B system where the failure has occurred. When recovery is detected, one of a conflict start trigger frame, a failure adjacent A declaration frame, a failure adjacent A transition frame, or a failure adjacent A transition response frame is determined, and the state transition of each node is controlled according to the determination result To do.

  Further, when transmitting the inter-adjacent frame and the network control frame based on the state of each node, the network control unit 18 reads the corresponding frame from the transmission buffer 16 via the transmission frame control unit 17 and transmits it to the port state control unit 13. At this time, the port state control unit 13 determines the tag included in the received corresponding frame, determines whether to transmit to the port A (11) or the port B (12), and transmits.

That is, the port state control unit 13 and the network control unit 18 described above function as means (1) to (4) listed below by cooperating with the port state control unit and the network control unit in other nodes. . With these functions, when a failure in the transmission line 10 is detected, the network is reconstructed as appropriate, and the state of each node is dynamically determined.
(1) Regarding the state of its own node, the transmission of the frame using the port B (12) is blocked, and the transmission of the A terminal station and the transmission path 10 around the B system using the port A (11) for the transmission of the frame is performed. Terminate and transmit the frame to the terminal station and transmission path that transmit the frame using port B (12), and transmit the frame bidirectionally using both port A (11) and port B (12) (2) A frame between adjacent nodes is exchanged with an adjacent node, a transmission path 9 around the A system, and a transmission path around the B system. (3) The node that has detected the failure as a result of monitoring transmits a network control frame by multicast using the transmission path 10 around the B system, and the node A The transition to the terminal As a result, means for transitioning the adjacent node around the B system to the terminal station and the other node to the intermediate station (4) As a result of monitoring, the A terminal station that has detected the recovery of the fault is the transmission line around the A system. 9 is used to transmit a network control frame by multicast, and arbitration is performed by one or more A terminal stations that have received this network control frame, and a transition is made to an intermediate station as a result of the arbitration. Means for Reconstructing Network with Node Transitioning to Terminal Station via Other Nodes Details of any of the above means will be described later.

  The ring map control unit 19 performs processing based on the state of the own node. That is, when the state of the own node is the intermediate station node, when the ring map generation frame is input from the port state control unit 13, the ring map control unit 19 adds the ring map generation frame to the input ring map generation frame. The node information is added and output to the port state control unit 13.

  When the state of the own node is the terminal station node, the ring map control unit 19 is described in the input ring map generation frame when the ring map generation frame is input from the port state control unit 13. The node information is added to the ring map to complete the ring map, and the completed ring map is output to the ring map holding unit 20.

  Further, the ring map control unit 19 may further generate a ring map transfer frame in which the completed ring map is described and output it to the port state control unit 13. As a result, the ring map transfer frame can be transmitted to other nodes, and some or all of the nodes that have received the ring map transfer frame internally retain the ring map described in the ring map transfer frame. It becomes possible to do. If a ring map is held inside the node, the terminal 7 (8) (see FIG. 7A) connected to the node can display the ring map on a display device (not shown). Thus, the administrator can grasp configuration information indicating what kind of node the network is configured by referring to a ring map displayed on a display device (not shown).

  When the state of the own node is the master node, the ring map control unit 19 generates a ring map generation frame, for example, every predetermined time (for example, every 3 seconds), and generates the generated ring map. The node information is added to the generation frame and output to the port state control unit 13.

  Here, when the state of the own node is the intermediate station node, the terminal station node, and the master node, the information of the own node added to the ring map generation frame is not particularly limited. For example, the MAC address ( It may be the address of its own node such as Media Access Control address) or IP address (Internet Protocol address), or it may be a node number, and the status of its own node such as a master node, intermediate station node, terminal station node, etc. May be shown. Moreover, the information (for example, MAC address, IP address, etc.) of the terminal 7 (8) (see FIG. 7A) connected to the own node may be used. The area to which the information of the own node is added may be anywhere in the ring map generation frame, but may be a data area (see FIG. 9A), for example. In each node, it is preferable to add the information of the own node to the ring map generation frame after the information of other nodes. As a result, the administrator can grasp the connection order of the nodes together with the configuration information described above.

  When a ring map is input from the port state control unit 13, the ring map holding unit 20 stores the input ring map inside (for example, a storage unit (not shown) in the own node).

  The duplication check control unit 21 performs duplication check on the information of the transmission source node of the duplication check request frame input from the port state control unit 13. That is, the duplication check control unit 21 includes at least one of information on the transmission source node of the duplication check request frame input from the port state control unit 13 and node information included in the ring map stored inside the node. It is determined whether or not.

  Further, the duplication check control unit 21 generates a duplication check request frame in accordance with a predetermined instruction, and sets information of the own node in the generated duplication check request frame (in the example of FIG. 9A, the duplication check request frame A node that sets the address of its own node as a transmission source address) and can communicate a duplicate check request frame in which information of its own node is set (in FIG. 7B, at least one of the intermediate station 3 and the intermediate station 4) One). The predetermined instruction is obtained by, for example, outputting an overlap check instruction input from the terminal Y (FIG. 7B) by the administrator to the overlap check control unit 21 of the new joining node (FIG. 7B). Given. The information on the own node is not particularly limited, and may be the address of the own node such as a MAC address or an IP address, or may be other information for specifying the own node. Moreover, the information of the terminal Y (refer FIG.7 (b)) connected to the own node may be sufficient. The area to which the information of the own node is added may be anywhere in the duplicate check request frame.

FIGS. 11 to 18 are diagrams showing network construction operations in the transmission line system according to the second embodiment. Both are shown based on the physical configuration of the transmission line system of the present invention shown in FIG. The state of each node is dynamically determined by the network construction operation shown in FIGS.
11 and 12 show network control procedures when a failure occurs, FIGS. 13 and 14 show network control procedures when a failure is recovered, and FIGS. 15 and 16 show network control procedures when a plurality of loops are integrated. FIG. 17 and FIG. 18 show network control procedures when the power is turned on. In FIG. 11 to FIG. 18, ◯ indicates a port assigned as a relay port, ● indicates a port assigned as a logical switching port, and ‖ indicates a blocking (logical disconnection) state. Also, in the figure, the numbers # 1 to # 6 and #X assigned to the nodes correspond to the numbers 1 to 6 and X of the ports shown in FIG.

  Hereinafter, the network construction operation in the transmission line system according to the second embodiment will be described in detail with reference to FIGS.

  First, the network control when a failure occurs will be described with reference to FIGS. Here, node # 1 is assigned to the A terminal station, port B is blocked, node # 2 is assigned to the B terminal station, port A is blocked, and each of nodes # 3 to # 6 is networked as an intermediate station. Will be described as being constructed.

Each node # 1 to # 6 confirms the soundness of the transmission line 9 (10) by periodically performing inter-adjacent frame communication (FIG. 11 (a)). It is assumed that a failure has occurred due to n consecutive failures of the inter-adjacent frame. Here, it is assumed that a failure due to disconnection has occurred between nodes # 4 to # 5 by detecting the failure of 3 consecutive times. (FIG. 11B).
As a result, the node # 4 that detected the failure makes a transition to the failure adjacent A terminal station mode, and multicasts a frame (failure adjacent A transition frame) that declares that it has changed to the failure adjacent A terminal station around the B system. To do. In response, node # 5 transitions to the faulty adjacent B terminal mode (FIG. 11 (c)).

On the other hand, the node # 1 receives the failed adjacent A transition frame, recognizes that there is another A terminal station, transitions to the intermediate station, and cancels blocking. Further, the node # 2 recognizes that the node # 1 is not the B terminal station when the node # 1 becomes the intermediate station, and transitions to the intermediate station to release the blocking (FIG. 12 (d)).
Subsequently, since the node # 5 has transitioned to the failure adjacent B terminal mode, when receiving the failure adjacent A transition frame, the node # 5 multicasts a response frame (failure adjacent A transition response frame) around the A system (FIG. 12 (e)). ).
The node # 4 recognizes that there is a response from the terminal B by receiving the faulty adjacent A transition response frame, and stops transmitting the faulty adjacent A transition frame. Each of the nodes # 1 to # 6 continues to check the soundness of the transmission path by periodically communicating the adjacent frames (FIG. 12 (f)).

Next, network control at the time of failure recovery will be described with reference to FIGS. Here, a failure such as disconnection occurs between the nodes # 4 to # 5, the node # 4 becomes the faulty adjacent A terminal station, the port B is blocked, and the node # 5 becomes the faulty adjacent B terminal station. A is blocked, and the network is constructed with the nodes # 1 to # 3 and # 6 as intermediate stations.
Each node # 1 to # 6 confirms the soundness of the transmission line 9 (10) by periodically executing inter-adjacent frame communication (FIG. 13A).

Next, it is assumed that the failure has been recovered by connecting the disconnection that occurs between the nodes # 4 to # 5. Here, it is detected that the inter-adjacent frame communication has succeeded three times in succession, and the failure recovery between the nodes # 4 to # 5 is recognized (FIG. 13B).
When the port B is linked up, the node # 4 transitions from the faulty adjacent A terminal station mode to the logical disconnection A terminal station contention mode, and multicasts a contention start trigger frame around the A system. As a result, the node # 5 transitions from the failure adjacent B terminal station mode to the logically disconnected B terminal station mode when the port A is linked up (FIG. 13C).

The intermediate station and the B terminal station ignore the contention start trigger frame transmitted from the node # 4. For this reason, the node # 4 recognizes that only the node A exists in the network by receiving the contention start trigger frame transmitted by the node # 4. As a result, the node # 4 transitions from the logical disconnection A terminal station competition mode to the logical disconnection A terminal station mode (FIG. 14 (d)).
Each of the nodes # 1 to # 6 continues to check the soundness of the transmission line 9 (10) by periodically exchanging frames between adjacent frames thereafter (FIG. 14 (e)).

  Next, network control at the time of integrating a plurality of loops will be described with reference to FIGS. Here, it is assumed that a failure has occurred between the nodes # 1 and # 2, and between the nodes # 4 and # 5, and the node # 1 and the node # 4 are the failure adjacent A terminal stations, blocking the port B, and the node # 2 and node # 5 become the faulty adjacent B terminal station port, block port A, and the network is constructed with node # 3 and node # 6 as intermediate stations.

Each node # 1 to # 6 confirms the soundness of the transmission line 9 (10) by periodically performing inter-adjacent frame communication (FIG. 15A).
Here, it is assumed that the failure between the nodes # 1 and # 2 has been recovered. That is, when the inter-adjacent frame is succeeded three times in succession, the node # 1 serving as the faulty adjacent A terminal station detects the fault recovery between the nodes # 1 and # 2 (FIG. 15B).
Subsequently, the node # 1 transitions from the failure adjacent A terminal mode to the logical disconnection A terminal contention mode when the port B is linked up, and multicast-transmits the contention start trigger frame around the A system. Node # 2 transitions from the faulty adjacent B terminal mode to the logically disconnected B terminal mode when port A is linked up (FIG. 15 (c)).

Nodes # 3 and # 6 as intermediate stations and nodes # 2 and # 5 as B terminal stations ignore the contention start trigger frame transmitted from node # 1. The node # 4 receives the contention start trigger frame. At this time, the node # 4 is in the faulty adjacent A terminal mode and has the highest priority. Therefore, the failure adjacent A declaration frame is transmitted to the node # 1, which is the transmission source of the contention start trigger frame, to notify that the priority of the own node is high (FIG. 16 (d)).
Node # 1 receives the faulty adjacent A declaration frame and recognizes that there is an A terminal with high priority in the network. For this reason, a transition is made from the logical disconnection A terminal station contention mode to the intermediate station to release the blocking. Also, node # 2 recognizes that its own node is not a B terminal because node # 1 becomes an intermediate station, and transitions to the intermediate station to release blocking. Each node continues to check the soundness of the transmission path by periodically exchanging frames between adjacent frames (FIG. 16 (e)).

Finally, a network control procedure at power-on will be described with reference to FIGS. Here, it is assumed that the node # 1 and the node # 2 are started up among the three nodes, and that the node # 3 is still powered off (FIG. 17A).
First, the nodes # 1 and # 2 that are powered on transition from the power-off state to the isolated mode. Subsequently, when the inter-adjacent frame succeeds three times in succession and the nodes # 1 and # 2 link up, the node # 1 changes from the isolated mode to the faulty adjacent B terminal, and the node # 2 A transition is made to the faulty adjacent A terminal mode (FIG. 17B).

Next, assume that node # 3 is started up. As a result, the node # 3 transitions from the power-off state to the isolated mode (FIG. 17C).
Subsequently, the node # 3 transitions from the isolated mode to the faulty adjacent B terminal mode when the inter-adjacent frames succeed three times in succession. Also, node # 1 transitions from the faulty adjacent B terminal mode to the intermediate station when port A is linked up, and releases blocking (FIG. 18 (d)).

Subsequently, when the inter-adjacent frame between the node # 2 and the node # 3 succeeds three times in succession, the node # 3 transitions from the faulty adjacent B terminal mode to the logically disconnected B terminal mode. Further, the node # 2 transitions from the failure adjacent A terminal mode to the logical disconnection A terminal contention mode when the port B is linked up, and multicasts a contention start trigger frame around the A system (FIG. 18). (E)).
At this time, the node # 1 that is the intermediate station and the node # 3 that is the B terminal station ignore the contention start trigger frame transmitted from the node # 2. Also, since the contention start trigger frame transmitted by the node # 2 is returned, the node # 2 recognizes that the A terminal station exists only in the network. Node # 2 then transitions from the logical disconnection A terminal station competition mode to the logical disconnection A terminal station mode.
Each node # 1 and # 3 continues to check the soundness of the transmission path by periodically exchanging frames between adjacent frames thereafter (FIG. 18 (f)).

  FIG. 19 is a diagram illustrating state transition between modes of the transmission line system according to the second embodiment. The operation | movement demonstrated using FIGS. 11-18 is typically shown. In the figure, “up” indicates a state in which the adjacent station is logically connected, and “down” indicates a state in which it is logically disconnected.

As described above, in the second embodiment, the plurality of nodes # 1 to # 6 perform frame transmission using the transmission path 9 around the A system and the transmission path 10 around the B system. The node blocks the transmission of the control frame using port B, terminates the transmission path around the A terminal station and B system using port A for frame transmission, and transmits the frame using port B. Build a transmission line system by assigning it to either the terminal station node or (3) an intermediate node that transmits and receives frames to and from both transmission lines and performs bidirectional transmission of frames using both port A and port B To do.
At this time, each of the nodes # 1 to # 6 (frame transmission apparatus) exchanges a first control frame with an adjacent node to monitor a transmission path failure. Then, the node that has detected the failure transmits the second control frame by multicast using the transmission path 10 around the B system, notifies other nodes that it has transitioned to the A terminal station, The node to be transferred is changed to a terminal station node, and the other nodes are changed to intermediate station nodes. On the other hand, the A terminal station that has detected the recovery of the failure multicasts the second control frame using the transmission path 9 around the A system, and arbitrates by one or more A terminal stations that have received the second control frame. The network between the only A terminal station that is determined and determined and the node that transitions to the terminal station node via the other node that transitions to the intermediate station node as a result of arbitration is reconstructed.

As a result, in the bi-directional double ring transmission line system, detection of occurrence and recovery of a transmission line failure can be realized by a handshake in which the first control frame is exchanged between adjacent nodes. A node that detects the occurrence of a failure makes a transition to the A terminal, performs arbitration by multicasting the second control frame, and reconstructs the network, thereby shortening the time required for constructing the logical topology.
The second control frame also has a meaning as a trigger for exchanging topology information. Since the second control frame is simultaneously notified to each node by multicast, the processing for topology construction and topology restoration is accelerated. can do.

  In addition, according to the second embodiment described above, only the disconnection of the transmission path has been illustrated and described as the failure. However, for the node failure and the like as well, the adjacent failure detection node operates as the A terminal station. The same effect can be obtained.

  20 to 21 are diagrams showing operations for generating a ring map, transferring and checking node information duplication in a transmission line system (see FIGS. 11 to 18) in which the state of each node is dynamically determined. . FIG. 20 shows a procedure for ring map generation and ring map transfer before the occurrence of a failure, and FIG. 21 shows a procedure for ring map generation, ring map transfer, and node information duplication check after the occurrence of a failure.

  Hereinafter, the operations of ring map generation, ring map transfer, and node information duplication check in the transmission line system according to the second embodiment will be described in detail with reference to FIGS.

  As shown in FIG. 20 (a), the node # 1, which is the A terminal, for example, generates a ring map generation frame every predetermined time, and adds its own node information to the generated ring map generation frame. Then, it transmits in one direction (around B system). When nodes # 6, # 5, # 4, and # 3, which are intermediate stations, receive the ring map generation frame, they add their own node information to the received ring map generation frame and perform one-way (around the B system). Transmit to. When the node # 2, which is the B terminal, receives the ring map generation frame, the node # 2 completes the ring map by adding its own node information to the ring map described in the received ring map generation frame.

  As shown in FIG. 20 (b), the node # 2 which is the B terminal station further transmits a ring map transfer frame in which the completed ring map is described in the other direction (around the A system). A ring map may be held in some or all of the nodes. For example, when all other nodes hold the ring map, the node # 2, which is the B terminal station, transmits the ring map transfer frame in the other direction (around the A system) by multicast. When the intermediate stations (nodes # 3 to # 6) receive the ring map transfer frame, the intermediate stations store the ring map described in the received ring map transfer frame (for example, a storage unit (not shown) in the own node). The received ring map transfer frame is transferred in the other direction (around the A system). When the A terminal station (node # 1) receives the ring map transfer frame, the A terminal station (node # 1) stores the ring map described in the received ring map transfer frame inside (for example, a storage unit (not shown) in its own node).

  Assume that a failure has occurred between node # 4 and node # 5 as shown in FIG.

  As shown in FIG. 21 (d), node # 4 transitions to the A terminal station, nodes # 1 to # 3 and # 6 transition to the intermediate station, and node # 5 transitions to the B terminal station. The state transition operation of each node is as described above with reference to FIGS. When the state of each node changes, node # 4, which is the A terminal station, generates, for example, a ring map generation frame every predetermined time, and adds the information of the own node to the generated ring map generation frame. Transmit in one direction (around system B). When nodes # 3, # 2, # 1, and # 6, which are intermediate stations, receive the ring map generation frame, they add their own node information to the received ring map generation frame and perform one-way (around B system) Transmit to. When node # 5, which is the B terminal, receives the ring map generation frame, it adds its own node information to the received ring map generation frame, and transmits the completed ring map to the inside of its node (for example, its own node). In a storage unit (not shown).

  As shown in FIG. 21 (e), the node # 5 which is the B terminal station further transmits a ring map transfer frame in which the completed ring map is described in the other direction (around the A system), thereby A ring map may be held in some or all of the nodes. For example, when all other nodes hold the ring map, the node # 5, which is the B terminal station, transmits the ring map transfer frame in the other direction (around the A system) by multicast. When the intermediate stations (nodes # 1 to # 3 and # 6) receive the ring map transfer frame, the intermediate station internally stores the ring map described in the received ring map transfer frame (for example, not shown in the own node). The ring map transfer frame stored in the storage unit) is transferred in the other direction (around the A system). When the A terminal station (node # 4) receives the ring map transfer frame, the A terminal station (node # 4) stores the ring map described in the received ring map transfer frame inside (for example, a storage unit (not shown) in its own node).

  As shown in FIG. 21 (f), it is assumed that a newly joined node (node #X) and intermediate station # 3 and intermediate station # 4 are connected to be communicable. The new joining node (node #X) generates a duplication check request frame, sets its own node information in the generated duplication check request frame, and sets the duplication check request frame in which its own node information is set to the intermediate station 3 and the intermediate station 3 Transmit to at least one of the stations 4. The node that has received the duplication check request frame performs duplication check on the information of the transmission source node set in the received duplication check request frame. That is, it is determined whether or not the information of the transmission source node of the received duplication check request frame and at least one of the node information included in the ring map stored inside the node are duplicated.

  As in the example described above, the state of each node changes due to the occurrence of a failure, and the state of each node is dynamically determined. In the second embodiment, in such a situation, the master node (A terminal station) generates a ring map generation frame, adds its own node information to the generated ring map generation frame, and moves around the B system. When the intermediate station node (intermediate station) receives the ring map generation frame from the adjacent node, the information of the own node is added to the received ring map generation frame and transmitted around the B system. When a node (terminal station) receives a ring map generation frame from an adjacent node, it completes the ring map by adding its own node information to the ring map described in the received ring map generation frame. . This makes it possible to efficiently collect information on each node.

  Also, as in the example shown above, when a node constituting the transmission path system receives information on a new subscription node from a new subscription node that newly joins the transmission path system, the node information included in the ring map It was decided whether or not at least one of the information of the newly joined node was duplicated. As a result, it is possible to efficiently determine whether or not a node having information overlapping with the information of a newly joined node to the transmission line system to which a plurality of nodes are connected already exists in the transmission line system. . Such a determination can be performed if the node holds the ring map therein. That is, the determination can be made at the terminal station node that completed the ring map, or at the intermediate station node or the master node to which the ring map has been transferred from the terminal station node.

  It can also be determined in an intermediate station node or a master node that does not hold a ring map. In other words, when the intermediate station node or the master node receives information on a new joining node from a new joining node newly joining the transmission path system, a ring map transmission request for urging the terminal station node to transmit the ring map may be transmitted. Then, when the terminal station node receives the ring map transmission request, it transmits the completed ring map around the A system, thereby transferring the ring map to the transmission source node of the ring map transmission request. The receiving node can determine whether at least one of the node information included in the received ring map and the information of the newly joined node overlap.

  Each of the port state control unit 13, the reception frame control unit 15, the transmission frame control unit 17, the network control unit 18, the ring map control unit 19, the ring map holding unit 20, and the duplication check control unit 21 shown in FIG. The bidirectional function described above is also realized by realizing the functions possessed by a program, storing the program in a computer-readable recording medium, and a CPU (Central Processing Unit) serving as a control center of each node sequentially reading and executing the program. A double ring transmission line system and a frame transmission apparatus can be constructed.

It is a figure which shows the logical basic concept of the transmission line system in connection with 1st Embodiment, (a) shows the state before the connection of a new joining node, (b) shows the state after the connection of a new joining node. ing. It is a figure which shows the kind of flame | frame transmitted / received in the transmission line system concerning 1st Embodiment. It is a figure which shows the data format of the flame | frame used by the transmission line system concerning 1st Embodiment, (a) Ring map production | generation frame, (b) Ring map transfer frame, (c) User frame, each data The format is shown. It is a block diagram which shows the internal structure of the data transmission apparatus concerning 1st Embodiment. It is a figure which shows the physical fundamental structure of the transmission line system concerning 1st Embodiment. It is a figure which shows the procedure of the ring map production | generation in a transmission line system concerning 1st Embodiment, ring map transfer, and the duplication check of node information. It is a figure which shows the logical basic concept of the transmission-line system concerning 2nd Embodiment, (a) shows the state before the connection of a new joining node, (b) shows the state after the connection of a new joining node. ing. It is a figure which shows the kind of flame | frame transmitted / received in the transmission line system concerning 2nd Embodiment. It is a figure which shows the data format of the frame used with the transmission line system concerning 2nd Embodiment, (a) Inter-adjacent frame, (b) Network control frame, (c) User frame, each data format is shown. . It is a block diagram which shows the internal structure of the data transmission apparatus concerning 2nd Embodiment. It is a figure which shows the procedure of the network control at the time of the failure generation of the transmission line system concerning 2nd Embodiment. It is a figure which shows the procedure of the network control at the time of the failure generation of the transmission line system concerning 2nd Embodiment. It is a figure which shows the procedure of the network control at the time of the failure recovery of the transmission line system concerning 2nd Embodiment. It is a figure which shows the procedure of the network control at the time of the failure recovery of the transmission line system concerning 2nd Embodiment. It is a figure which shows the procedure of the network control at the time of multiple loop integration of the transmission-line system concerning 2nd Embodiment. It is a figure which shows the procedure of the network control at the time of multiple loop integration of the transmission-line system concerning 2nd Embodiment. It is a figure which shows the procedure of the network control at the time of power activation of the transmission line system concerning 2nd Embodiment. It is a figure which shows the procedure of the network control at the time of power activation of the transmission line system concerning 2nd Embodiment. It is a figure which shows the state transition between the modes of the transmission-line system in connection with 2nd Embodiment. It is a figure which shows the procedure of the ring map production | generation and ring map transfer before the failure generation of the transmission line system concerning 2nd Embodiment. It is a figure which shows the procedure of the ring map production | generation after a failure generation | occurrence | production of the transmission line system in connection with 2nd Embodiment, ring map transfer, and the duplication check of node information.

Explanation of symbols

1-6 nodes (frame transmission equipment)
X Newly joined node 7, 8, Y terminal 9, 10 Transmission path (around system A, system B)
11 Port A (first port)
12 Port B (second port)
DESCRIPTION OF SYMBOLS 13 Port state control part 14 Reception buffer 15 Reception frame control part 16 Transmission buffer 17 Transmission frame control part 18 Network control part 19 Ring map control part 20 Ring map holding part 21 Duplication check control part 22 Frame control part

Claims (2)

A plurality of nodes are connected in a ring shape through transmission lines around the A system and the B system, and each of the plurality of nodes is
A master node capable of blocking transmission of frames around the A system and transmitting frames around the B system;
A terminal station node capable of transmitting a frame around the A system and terminating a transmission path of the frame around the B system;
Among the intermediate station nodes capable of transmitting frames around the A system and the B system,
A transmission line system dynamically determined by any one of the following:
The master node generates a ring map generation frame for generating a ring map, which is information about the plurality of nodes , every predetermined time, and adds information of the own node to the generated ring map generation frame And transmitted around the B system,
When the intermediate station node receives a ring map generation frame from an adjacent node, it adds its own node information to the received ring map generation frame and transmits it around the B system.
It said terminal station node receives the ring map generation frame from an adjacent node, to complete the ring map by adding information of the node in the ring map described in the ring map generation frames received, to complete Further, by transmitting the ring map around the system A , the completed ring map is transferred and stored in one or more intermediate station nodes and the master node,
When a new joining node newly joining the transmission path system is communicably connected to the ring-shaped transmission path, it generates a duplicate check request frame including its own node information and transmits it to another node,
When at least one of the one or more intermediate station nodes storing the completed ring map and the master node receives the duplicate check request frame, the ring map stored by itself is stored. transmission line systems even without least of the nodes of information and one information of the new joining node and judging whether the overlapping contained. The plurality of nodes are:
The transmission path system according to claim 1, wherein an address of the own node is used as the information of the own node.

Images