JP2010016597A - Node, and network system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a node capable of automatically acquiring same setting information as that before replacement without the need of ID setting work even when any node is replaced in a network system to which a plurality of nodes are connected, and to provide a network system. <P>SOLUTION: The node stores configuration information of an adjacent node while associating it with mutual node IDs and port numbers. For example, a node C associates configuration information of a node D in such a way that ID of the node D=D, connection port number of the node D=1, ID of the node C=C and number of a port connected to the node D=2, and stores them. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a node and a network system that make it possible to exchange nodes quickly and safely by mutually holding configuration information of nodes connected to the network system.

  When a node is replaced due to a node failure or the like, the configuration information set in the node before replacement must be backed up and set again in the node after replacement. However, setting work takes time and effort, and if there is a setting error, there is a possibility that the entire network will be stopped. For this reason, a system for reducing the setting work at the time of node replacement has been proposed (for example, see Patent Document 1).

In a conventional system, a specific node set in advance holds the configuration information of each node in association with the node ID.
JP 2006-166083 A

  However, in the management based on the node ID, it may take time to identify the failed node if the node ID is set incorrectly.

  Further, in the method of collecting configuration information in a specific master node set in advance, the node cannot be recovered when the master node is down or not connected.

  Therefore, the present invention makes it possible to automatically obtain the same configuration information as before replacement without requiring ID setting work when any node is replaced in a network system in which a plurality of nodes are connected. The purpose is to provide a node and a network system.

  In order to solve the above-described problem, the node according to the present invention is characterized in that each node connected to the network system holds configuration information of an adjacent node in association with a connected port. .

Specifically, a node according to the present invention is a node connected to a network composed of a plurality of nodes, and the configuration information of other nodes connected to its own port is indicated by its own port number. And a backup information storage unit for storing the information in association with the link information including the node name and the port number of the other node connected to the own port.
Multiple nodes memorize link information and configuration information between adjacent nodes, so no matter which node is exchanged, ID setting work is not required and the same configuration information as before the exchange is automatically acquired. Can be possible.

In the node according to the present invention, the backup information storage unit further stores configuration information of a node N (N is an integer of 2 or more) hops away from its own node connected to the other node. Stored in association with link information including the node name of the current node and the port number to which the N-hop destination node is connected and the node name of the N-hop destination node and the port number to which the other node is connected It is preferable.
Since each node stores configuration information of nodes that are two or more hops away, even if a plurality of adjacent nodes are exchanged at the same time, ID setting work is not necessary, The same configuration information can be acquired.

In the node according to the present invention, the node name, the transmission port number, and the configuration information of the other node transmitted from the other node connected to the own port are output together with the port number of the own port. Link information is generated by associating the receiving unit, the node name of the other node from the receiving unit and the transmission port number thereof, the port number received from the receiving unit and the own node name, and the link information is It is preferable to include a backup information acquisition unit that is stored in the backup information storage unit in association with configuration information of another node from the reception unit.
By providing the reception unit and the backup information acquisition unit, each node can hold the configuration information of the adjacent node in association with the connected port. As a result, when any node is exchanged, the same configuration information as before the exchange can be automatically acquired without requiring an ID setting operation.

The node according to the present invention reads the configuration information stored in the configuration information storage unit at a predetermined timing, and the configuration information storage unit that stores the configuration information and the node name of itself. A configuration information reading unit that outputs a holding request that specifies holding the node name, the specified port number, and the read configuration information; When the configuration information reading unit outputs a holding request, the transmitting unit transmits the holding request, the node name, the port number, and the configuration information from the configuration information reading unit from the port corresponding to the designated port number. And hold requests from other nodes When receiving, the receiving unit that outputs the received holding request, the node name, its transmission port number, and the configuration information together with the received port number, and the receiving unit holds the holding request, the node name of another node, and its transmission When the port number and the configuration information are output together with the received port number, the node name of the other node from the receiving unit and its transmission port number, the port number received from the receiving unit and its own node name It is preferable to further include a backup information acquisition unit that generates link information in association with each other and stores the link information in the backup information storage unit in association with configuration information of other nodes from the reception unit.
By providing the configuration information reading unit and the transmission unit, it is possible to cause an adjacent node to hold its own configuration information in association with the connected port. Further, by providing the receiving unit and the backup information acquiring unit, each node can hold the configuration information of the adjacent node in association with the connected port. As a result, when any node is exchanged, the same configuration information as before the exchange can be automatically acquired without requiring an ID setting operation.

In the node according to the present invention, when the backup information acquisition unit outputs a transfer instruction for instructing transfer to another node, the name of the instructed node name among the configuration information stored in the backup information storage unit A backup information reading unit that reads the configuration information together with the link information stored in association with the received port number, designates a port number different from the received port number, and outputs the configuration information together with the holding request to the transmitting unit The configuration information reading unit further attaches a transfer residual number for instructing the number of transfers to the configuration information, and the backup information acquisition unit further adds 1 from the transfer residual number attached to the configuration information. Judge whether the subtracted number is 0 or not, and the subtracted number If it is not 0, the subtraction number is added to the configuration information and a transfer instruction is output to the backup information reading unit, and the transmission unit reads the backup information when the backup information reading unit outputs a holding request. It is preferable to transmit the holding request, the configuration information, and the link information from the unit from the port corresponding to the designated port number.
Each node can store configuration information of a node that is two or more hops away from its own node. Even when a plurality of adjacent nodes are exchanged at the same time, it is possible to automatically acquire the same configuration information as before the exchange without requiring an ID setting operation.

In the node according to the present invention, when the own node name and configuration information are not set, the reception unit stores configuration information of a node other than the other node in another node. When outputting a holding notification to notify, the node name of the other node from the receiving unit and its port number and the link information from the receiving unit are collated, a node determining unit that determines its own node name, When the node determination unit determines its own node name but its configuration information is not set, when the recovery notification is output to notify that the reception unit is recovery information, The node name that matches the node determined by the node determination unit is selected from the node names, and the configuration output from the reception unit together with the node name is selected. Configuration information acquisition unit for storing the configuration information as its own configuration information in the configuration information storage unit, the backup information reading unit in the backup information storage unit at a predetermined timing Read the stored link information, specify the port number to which the other node is connected, and output the own node name, the specified port number, and the read link information to the transmitter together with the holding notification Then, at a predetermined timing, the configuration information and link information stored in the backup information storage unit are read out, the port number to which another node is connected is specified, and its own node name is specified. Port number, read configuration information and Information is output to the transmission unit together with a recovery notification. When the backup information reading unit outputs a retention notification, the transmission unit receives the retention notification, node name, port number, and link information from the backup information reading unit. When the backup information reading unit outputs a recovery notification, the recovery information from the backup information reading unit, the node name, the port number, the configuration information, and the link information are transmitted from the port corresponding to the designated port number. Transmitting from the port corresponding to the specified port number, and the receiving unit receives the holding notification, node name, port number, and link information from another node, the received holding notification, node name, port number, link information Is output together with the received port number, recovery notification from other nodes, node name, port number, config When the location information and the link information are received, it is preferable to output the recovery notification, the node name, the port number, the configuration information, and the link information together with the received port number.
It is possible to cause the new node after the exchange to automatically obtain the same configuration information as the node connected before the exchange from the adjacent node. Thereby, even when a node is replaced, the network can be automatically restored without requiring ID setting work.

In the node according to the present invention, when the receiving unit outputs a retention notification or a recovery notification, it is determined whether or not the number obtained by subtracting 1 from the transfer residual number attached to the retention notification or the recovery notification is 0,
If the number obtained by subtracting 1 from the transfer residual number attached to the retention notification is not 0, specify a port number different from the port number received by the retention notification, and attach the subtracted number to receive with the retention notification. If the number obtained by subtracting 1 from the transfer residual number attached to the holding notification is 0, nothing is output, and 1 is subtracted from the transfer residual number attached to the recovery notification. If the number obtained is not 0, specify a port number different from the port number received in the recovery notification, add the subtracted number, and output the information received together with the recovery notification to the transmission unit, A configuration information transfer unit that outputs nothing when the number obtained by subtracting 1 from the attached transfer residual number is 0, and the backup information reading unit further instructs the number of transfers in the holding notification or the recovery notification Transfer It is preferable to subjecting the surplus number.
The new node after the exchange can automatically acquire the same configuration information as that of the node connected before the exchange from a node that is two hops away from its own node. Thus, even when a plurality of adjacent nodes are exchanged at the same time, it is possible to automatically restore the network without requiring ID setting work.

  The configuration information includes at least one of an IP address, a node name, and VLAN information.

The network system according to the present invention includes a plurality of nodes according to the present invention connected via the ports.
In the node according to the present invention, the nodes constituting the network mutually store the link information and the configuration information between adjacent nodes. Providing a network system in which the network system includes a plurality of nodes according to the present invention, so that it is possible to automatically obtain the same configuration information as before the replacement without any ID setting work when any node is replaced. Can do.

  According to the present invention, in a network system in which a plurality of nodes are connected, it is possible to automatically acquire the same setting information as before replacement without requiring ID setting work when any node is replaced. Can do.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiment described below is an example of the configuration of the present invention, and the present invention is not limited to the following embodiment.

  FIG. 1 is a schematic configuration diagram of a network system according to the present embodiment. Nodes A, B, C, D, E, F, and G are communication devices such as layer 2 switches having node names A, B, C, D, E, F, and G, respectively. The node name is, for example, a node ID that can be identified in the network system. Nodes A, B, C, D, E, F, and G are connected to a network composed of a plurality of nodes. For example, port 1 of node D and port 2 of node C are connected. The network may be, for example, a ring type, a star type, a mesh type, or a tree type.

  Each of the nodes A, B, C, D, E, F, and G includes a backup information storage unit that stores configuration information of other nodes connected to the port in association with link information. FIG. 2 shows an example of configuration information stored in each node. The configuration information of each node is stored in the adjacent node. For example, the configuration information of the node D is stored in the adjacent node C and node E that are directly connected by the port. Here, the link information is represented by the port number of the port that received the configuration information, the name of another node connected to the port, and the port number. For example, when the configuration information of the node D is received from the port 2 of the node C, the link information includes the node ID = D, the port number of the node D = 1, the adjacent node ID = C, and the port number of the node C = 2. Become. Since the configuration information is stored in association with the port number, the configuration information to be recovered can be specified even when there is an incorrect setting of the node ID. The configuration information includes parameters for operating the node (for example, IP address, node ID, VLAN information, etc.) and attribute information (for example, parameter creation date, error detection code, etc.). The link information is generally a correspondence between a port of a certain node and a port of another node that is physically connected to this, but for example, a virtual information such as a connection using a tunneling technology is used. Includes correspondence between support.

  In addition, it is preferable that the configuration information of each node is stored not only in the adjacent nodes but also in nodes that are two or more hops away. For example, the configuration information of the node D is also stored in the adjacent nodes C and E that are directly connected by the port, and the nodes B and F that are two hops away. At this time, the same information as the node C of the first hop is stored as the link information stored in the node B. That is, it functions as a mirror for the first hop from the second hop. As described above, the link information and the configuration information between the adjacent nodes are stored in the plurality of nodes, so that even when a plurality of adjacent nodes are exchanged at the same time, it can be automatically and quickly restored.

FIG. 3 is a configuration diagram illustrating an example of a node. The node includes a transmission unit 10, a reception unit 20, a backup information storage unit 11, a backup information acquisition unit 12, a backup information reading unit 13, a configuration information storage unit 21, a configuration information reading unit 22, A configuration information acquisition unit 23, a configuration information transfer unit 24, and a node determination unit 25 are provided.
The transmission unit 10 is connected to ports 1... N and performs a transmission operation in layer 1. The receiving unit 20 is connected to the ports 1... N and performs a receiving operation at layer 1. The backup information storage unit 11 stores the configuration information and link information described with reference to FIG. The configuration information storage unit 21 stores its own configuration information and node ID. Here, the predetermined timing is, for example, when configuration information is changed, when a node is started up, every predetermined time interval, or at a predetermined time.

The operation of the node when the node C shown in FIG. 1 stores the configuration information of the node D connected by the port will be described with reference to FIGS. FIG. 4 is a sequence diagram for storing the configuration information of the node D.
In step S11, the configuration information reading unit 22 of the node D reads out the configuration information stored in the configuration information storage unit 21 and its own node ID = D at a predetermined timing. The ID = D, the specified port number = 1, and the read configuration information are output together with a holding request for holding. Here, when the node to which the configuration information storage unit 21 is connected and its port number are stored, the port number is read out and designated to the transmission unit 10. When the configuration information reading unit 22 outputs a holding request, the transmitting unit 10 corresponds to the holding port, the node ID, the port number, and the configuration information from the configuration information reading unit corresponding to the designated port number. Send from port.

  In step S12, when the receiving unit 20 of the node C receives the holding request from the other node D, the holding request, the node ID = D, the port number = 1, and the configuration information together with the received port number = 2. And output to the backup information acquisition unit 12. When the receiving unit 20 outputs a holding request, the backup information acquiring unit 12 of the node C determines whether or not the link information attached to the holding request is undetermined, for example, “NULL”. If the link information is not yet determined, the link information is not generated, but if the link information is not determined, the link information is generated. When the link information is undetermined, for example, the node ID = D and port number = 1 of the other node D from the receiving unit 20, the own node ID = adjacent node ID = C, and the port number received from the receiving unit 20 = 2 is generated, link information of the configuration of the node D is generated, and the link information is stored in the backup information storage unit 11 in association with the configuration information of the other node D from the reception unit 20. Thereby, the configuration information and link information of the node D are stored in the adjacent node C.

  In step S31, the backup information reading unit 13 of the node C reads the link information stored in the backup information storage unit 11 at a predetermined timing, and designates the port number to which the other node D is connected. Then, the information is output to the transmission unit 10 together with a holding notification for notifying that configuration information other than its own node D is stored. When the backup information reading unit 13 outputs the holding notification, the transmitting unit 10 transmits the holding notification from the backup information reading unit 13 from the port corresponding to the designated port number = 2. Here, the predetermined timing is, for example, when the storage of the configuration information is completed, when the node is started up, when the port is connected, every predetermined time interval, or time. As a result, the holding notification is transmitted to the node D. The link information read by the backup information reading unit 13 is not limited to the link information of the node D, and is preferably all the stored link information. The port number to which the other node D is connected is stored in the backup information storage unit 11.

  The case where the adjacent node C stores the configuration information of the node D has been described above. Similarly, the node E can store the configuration information of the node D. Each node transmits the configuration information held by itself to the adjacent node together with the link information and the transfer remaining number, similarly to the node D described above.

Next, a case where the configuration information of the node D is also stored in the node B which is two hops ahead on the node C side will be described with reference to FIGS.
In this case, in step S11, it is preferable that the configuration information reading unit 22 of the node D further attaches a transfer residual number TTL (Time To Live) indicating the number of transfers to the configuration information. For example, information that the transfer remaining number TTL = 2 is attached to the holding notification. Then, the transmission unit 10 transmits to port 1.

  In step S21, the backup information acquisition unit 12 of the node C further determines whether or not the number obtained by subtracting 1 from the transfer remaining number attached to the configuration information is 0. If the number obtained by subtracting 1 from the transfer remaining number is not 0, a transfer instruction is output to the backup information reading unit 13. For example, since the transfer residual number TTL = 1 obtained by subtracting 1 from the transfer residual number TTL = 2 attached to the holding request from the node D is not 0, the backup information acquisition unit 12 of the node C sends the backup information reading unit 13 Output transfer instructions. Then, the backup information reading unit 13 of the node C includes the link information stored in association with the configuration information of the instructed node ID = D among the configuration information stored in the backup information storage unit 11. Read together with the received port number = 2, specify a port number = 1 different from the received port number = 2, and output to the transmitting unit 10 together with a holding request for holding. When the backup information reading unit 13 outputs a holding request, the transmitting unit 10 transmits the configuration information and link information from the backup information reading unit 13 from the port corresponding to the designated port number = 1. Thereby, the configuration information of the node D is transmitted to the node B.

  On the other hand, in step S21, when the number obtained by subtracting 1 from the transfer residual number TTL is 0, the backup information acquisition unit 12 of the node C does not output a transfer instruction to the backup information reading unit 13 and receives the reception unit 20. The configuration information and the link information output in the above are stored in the backup information storage unit 11 together with the received port number = 2.

  In Step S22, when receiving the holding request from the other node C, the receiving unit 20 of the node B outputs the holding request, the configuration information of the other node D, and the link information together with the received port number = 2. When the receiving unit 20 outputs a holding request, the backup information acquiring unit 12 of the node B determines whether the link information attached to the holding request is undetermined, for example, “NULL”. Since the link information of node D is generated at node C, it is not yet determined at node B. In this case, the backup information acquisition unit 12 of the node B stores the configuration information and link information from the reception unit 20 in the backup information storage unit 11. Thereby, the same information as the configuration information and link information stored in the node C is also stored in the node B.

  Further, the backup information acquisition unit 12 of the node B determines whether the number obtained by subtracting 1 from the transfer residual number attached to the configuration information is 0, as in step S21 performed by the backup information acquisition unit 12 of the node C. Determine whether. If the number obtained by subtracting 1 from the transfer remaining number is not 0, a transfer instruction is output to the backup information reading unit 13. When 1 is subtracted from the transfer residual number TTL = 1 attached to the holding request from the node C, the transfer residual number TTL = 0. In this case, the backup information acquisition unit 12 does not output a transfer instruction to the backup information reading unit 13, and backs up the same information as the configuration information and link information stored in the node C together with the received port number = 2. The information is stored in the information storage unit 11.

  In step S31, the backup information reading unit 13 of the node B performs the same operation as in step S31 in the node C described above. At this time, it is preferable that the backup information reading unit 13 of the node B further attaches a transfer remaining number indicating the number of transfers to the holding notification. For example, the transfer residual number TTL = 2 is attached to the holding notification.

  In step S32, when receiving the holding notification from the other node B, the receiving unit 20 of the node C outputs the holding notification and link information to the configuration information transfer unit 24 together with the received port number = 1. When the receiving unit 20 outputs a holding notification, the configuration information transfer unit 24 of the node C determines whether or not the number obtained by subtracting 1 from the transfer remaining number TTL = 2 attached to the holding notification is 0. To do. If the number obtained by subtracting 1 from the transfer remaining number is not 0, the port number = 2 that is different from the port number = 1 that received the information from the receiving unit 20 is designated and output to the transmitting unit 10. On the other hand, when the number obtained by subtracting 1 from the transfer residual number attached to the holding notification from the receiving unit 20 is 0, the information from the receiving unit 20 is not output. As a result, the holding notification is transferred from the node C to the node D.

  The case where the configuration information of the node D is also stored in the node B that is two hops ahead on the node C side has been described above. The configuration information of the node D can be stored in the node F by a similar configuration and method. Furthermore, it can be stored in a node that is three or more hops away by setting the transfer residual number.

Next, when the node D is replaced with a new node DD, a method for restoring the replaced node DD using the configuration information stored in the adjacent node C will be described with reference to FIGS. To do. FIG. 5 is a sequence diagram up to restoration of configuration information when the node D is replaced.
As described in FIG. 4, step S31 is performed at a predetermined timing. For example, step S31 is performed when the node C and the node E become conductive between the ports with the node DD. Nodes C and E transmit a holding notification and link information to the node DD.

  When the node D is replaced, the node ID after the replacement does not store its own node ID and configuration information. When the port of the node DD is connected to another node, the reception unit 20 of the node DD automatically receives the hold notification and the information of the transmission node from the connection destination nodes C and E in step S31. When the receiving unit 20 of the node DD after the exchange receives the holding notification from another node, the receiving unit 20 outputs the holding notification and the information on the transmission node transmitted together with the holding notification to the node determining unit 25. When the number of remaining transfers is attached to the holding notification, it is input to the node determination unit 25 via the configuration information transfer unit 24. For the transmission node C, the transmission node information transmitted together with the hold notification is, for example, the transmission source node ID = C, the transmission port number = 2, and all link information stored in the node C.

  In step S33, the node determination unit 25 of the node DD after replacement refers to the configuration information storage unit 21 of the node DD and determines whether or not its own node name and configuration information are set. When it is determined that the node name and the configuration information are not set, the reception unit 20 outputs the holding notification and the transmission node information, and the node determination unit 25 of the node DD after the exchange Information sent by the sending node C (node ID = C and port number = 2), information sent by the sending node E (node ID = E and port number = 2), and link information included in the holding notification are collated And determine its own node ID. For example, the link information from the node C indicates that the port number = 2 of the node ID = C and the port number = 1 of the node ID = D are connected, and the link information from the node E includes the node ID = It is described that port number E of E = 2 and port number = 2 of node ID = D were connected. It can be seen that the connection destination of the port number = 1 of the node DD after the exchange is the port number = 2 of the node C and the connection destination of the port number = 2 is the port number = 2 of the node E. 25 can determine that its node was D.

  Here, when the node determining unit 25 of the node DD determines its own node ID, the node determining unit 25 designates the port number = 1 to which the other node C is connected in step S34 and determines the determined self Node ID = D is output to the transmission unit 10 together with a recovery request for requesting transmission of a recovery notification. Then, the transmission unit 10 transmits a recovery request from the port 1. In addition, the receiving unit 20 of the node C that has received the recovery request outputs the recovery request and the node ID = D to the backup information reading unit 13 together with the received port number = 2.

  On the other hand, in step S35, the backup information reading unit 13 of the node C reads the configuration information and link information stored in the backup information storage unit 11, specifies port number = 2 that received the recovery request, and The node ID = C and the read configuration information are output to the transmission unit 10 together with a recovery notification for notifying that the information is recovery information. When the backup information reading unit 13 outputs the recovery notification, the transmission unit 10 of the node C transmits the recovery notification and configuration information from the backup information reading unit 13 from the port corresponding to the designated port number = 2.

  Here, there is also a method of performing step S35 at a predetermined timing without using a recovery request as a trigger. The predetermined timing is, for example, every predetermined time interval. In this case, the configuration information and link information to be read are preferably all information stored in the backup information storage unit 11 so that any node can be quickly recovered. For example, in the case of the node C, it is a combination of the configuration information and link information of the nodes A, B, D, and E.

  In step S36, when the receiving unit 20 of the replaced node DD receives the recovery notification from the other node C, it receives the recovery notification, node ID = C, its port number = 2, configuration information, and link information. Output with port number = 1. When the receiving unit 20 outputs the recovery notification together with the received port number, the configuration information acquiring unit 23 of the node DD after the exchange has a node ID that matches the node = D determined by the node determining unit 25 as its own node. = D is selected, and the configuration information output from the receiving unit 20 together with the node ID = D is stored in the configuration information storage unit 21 as its own configuration information. As a result, the new node DD can recover the configuration information of the node D before the replacement using the configuration information stored in the adjacent node C.

  Next, a case where the node D is replaced with the node DD and the node E is replaced with the node EE will be described with reference to FIGS. FIG. 6 is a sequence diagram up to restoration of the configuration information of the node D when the node D and the node E are exchanged. In this case, step S37 is further provided between step S31 and step 33.

  In step S37, when the receiving unit 20 of the node EE exchanged in step S31 receives the holding notification from the other node F, the holding notification, link information, transmission node information, node ID = F, port number = 2. Is output together with the received port number = 1. When the receiving unit 20 outputs the hold notification, the node determining unit 25 of the node EE after the exchange obtains the node ID = F and the transmission port number = 2 from the receiving unit 20 and the link information from the receiving unit 20. Collate and determine its own node ID candidate. At this time, without determining its own node ID only by this information, the received port number = 1 is designated as a port number = 2, and instead of its own node ID, its own node ID candidate E, The acquired link information, the adjacent node ID = F and its transmission port number = 2, the reception port number = 1, and the designated transmission port number = 2, together with the adjacent transfer notification indicating that the link information is transferred Output to the transmitter 10. Then, the transmission unit 10 of the node EE transmits the transfer notification from the node determination unit 25 from the port corresponding to the designated port number = 2. As a result, the replaced node DD adjacent to the node EE can acquire the port number = 2 of the node EE whose node ID is indefinite, the candidate of the node EE = E, and the link information received by the node EE. it can.

  On the other hand, the node determination unit 25 of the node DD after the replacement also acquires the node ID = C and the transmission port number = 2 and link information from the node C. Then, a port number = 2 different from the received port number = 1 is specified, the node ID candidate D instead of the node ID of itself, link information, adjacent node ID = C and its transmission port = 2 The reception port number = 1 and the designated transmission port number = 2 are output to the transmission unit 10 together with the adjacent transfer notification. Then, the transmission unit 10 transmits a transfer notification or the like from the port corresponding to the designated port number = 2. Thereby, the node EE adjacent to the node DD after the exchange can acquire the transmission port number = 2 of the node DD whose node ID is indefinite and the link information received by the node DD.

  In step S33, the node determination unit 25 of the node DD after replacement receives the node ID = C and its transmission port number = 2 obtained from the holding notification received at the port number = 1 from the reception unit 20, and the port number = Node ID candidate obtained from the adjacent transfer notification received at 2 = E, its transmission port number = 2, adjacent node ID = F of the node EE obtained from the adjacent transfer notification and its transmission port number = 2, The reception port number = 1 is collated with the link information from the reception unit 20 and its own node ID is determined as D. The subsequent steps S34 to S36 are the same as in the case of exchanging only the node D.

  Similarly, the node EE can determine its own node ID. In this case, the node determination unit 25 of the node EE is obtained from the node ID = F obtained from the holding notification received at the port number = 1, the transmission port number = 2, and the adjacent transfer notification received at the port number = 2. Node ID candidate = D, transmission port number = 2, adjacent node ID = C obtained from adjacent transfer notification, transmission port number = 2, reception port number = 1, and own node ID based on link information Is determined to be E. The subsequent steps S34 to S36 are the same as in the case of exchanging only the node D.

  The present invention can be used for a transmission apparatus constituting a network system such as a local area network.

1 is a schematic configuration diagram of a network system according to the present embodiment. An example of configuration information stored in each node is shown. It is a block diagram which shows an example of a node. 6 is a sequence diagram for storing configuration information of a node D. FIG. It is a sequence diagram until recovery of the configuration information when the node D is replaced. It is a sequence diagram until recovery of the configuration information of the node D when the node D and the node E are exchanged.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Transmission part 11 Backup information storage part 12 Backup information acquisition part 13 Backup information reading part 20 Reception part 21 Configuration information storage part 22 Configuration information reading part 23 Configuration information acquisition part 24 Configuration information transfer part 25 Node determination part A , B, C, D, E, F, G Node ID

Claims (9)

A node connected to a network composed of a plurality of nodes,
Configuration information of other nodes connected to the own port is stored in association with link information including the own port number, the node name of the other node connected to the own port, and the port number. A node comprising a backup information storage unit.   The backup information storage unit further includes configuration information of a node that is N (N is an integer of 2 or more) hops from its own node, connected to the other node, the node name of the other node, and the node The information is stored in association with link information including a port number to which an N-hop destination node is connected, a node name of the N-hop destination node, and a port number to which the other node is connected. The node according to 1. A receiving unit for outputting the node name of the other node transmitted from the other node connected to the own port and the transmission port number and configuration information together with the port number of the own port;
The link name is generated by associating the node name of the other node from the receiving unit and the transmission port number thereof with the port number received from the receiving unit and the own node name, and the link information is received from the receiving unit. The node according to claim 1, further comprising: a backup information acquisition unit that is stored in the backup information storage unit in association with configuration information of another node. A configuration information storage unit for storing its own configuration information and node name;
At a predetermined timing, the configuration information stored in the configuration information storage unit is read out, the port number to which another node is connected is designated, and the own node name, the designated port number, and A configuration information reading unit for outputting a holding request for holding the read configuration information;
When the configuration information reading unit outputs a holding request, the transmitting unit transmits the holding request, the node name, the port number, and the configuration information from the configuration information reading unit from the port corresponding to the designated port number. When,
When receiving a holding request from another node, the receiving unit that outputs the received holding request, the node name, its transmission port number, and the configuration information together with the received port number;
When the receiving unit outputs the holding request, the node name of the other node, its transmission port number, and the configuration information together with the received port number, the node name of the other node from the receiving unit and its transmission port number Link information is generated by associating the received port number and the node name received from the receiving unit, and the link information is associated with configuration information of other nodes from the receiving unit in the backup information storage unit. The node according to claim 1, further comprising a backup information acquisition unit to be stored. When the backup information acquisition unit outputs a transfer instruction for instructing transfer to another node, the configuration information of the instructed node name is associated with the configuration information stored in the backup information storage unit. A backup information reading unit that reads together with the stored link information and the received port number, specifies a port number different from the received port number, and outputs to the transmitting unit together with the holding request,
The configuration information reading unit further attaches a transfer residual number indicating the transfer count to the configuration information,
The backup information acquisition unit further determines whether or not the number obtained by subtracting 1 from the transfer residual number attached to the configuration information is 0. If the subtracted number is not 0, the backup information acquisition unit adds the configuration information to the configuration information. Output the transfer instruction to the backup information reading unit with the subtracted number,
When the backup information reading unit outputs a holding request, the transmitting unit transmits the holding request, configuration information, and link information from the backup information reading unit from a port corresponding to a specified port number. The node according to claim 4. When the receiving unit outputs a holding notification notifying that configuration information of a node other than the other node is stored in another node when the node name and configuration information of the node are not set A node determination unit that collates the node name and port number of the other node from the reception unit with link information from the reception unit, and determines its own node name;
When the node determination unit determines its own node name but its configuration information is not set, when the recovery notification is output to notify that the reception unit is information for recovery, from the reception unit The node name that matches the node determined by the node determination unit, and the configuration information output from the reception unit together with the node name as the configuration information of the configuration information storage unit A configuration information acquisition unit to be stored in
The backup information reading unit
At a predetermined timing, the link information stored in the backup information storage unit is read, the port number to which another node is connected is specified, its own node name, the specified port number, and read Output the link information together with the holding notification to the transmission unit,
Read configuration information and link information stored in the backup information storage unit at a predetermined timing, specify the port number to which the other node is connected, and specify its own node name and specified port number , Output the read configuration information and link information together with the recovery notification to the transmitter,
The transmitter is
When the backup information reading unit outputs a holding notification, the holding information from the backup information reading unit, node name, port number, link information is transmitted from the port corresponding to the designated port number,
When the backup information reading unit outputs a recovery notification, the recovery notification from the backup information reading unit, node name, port number, configuration information, link information is transmitted from the port corresponding to the specified port number,
The receiver is
When holding notification, node name, port number and link information are received from other nodes, the received holding notification, node name, port number and link information are output together with the received port number.
When a recovery notification, node name, port number, configuration information, and link information are received from another node, the recovery notification, node name, port number, configuration information, and link information are output together with the received port number. The node according to claim 5. When the receiving unit outputs a retention notification or a recovery notification, it is determined whether or not the number obtained by subtracting 1 from the transfer residual number attached to the retention notification or the recovery notification is 0,
If the number obtained by subtracting 1 from the transfer residual number attached to the retention notification is not 0, specify a port number different from the port number received by the retention notification, and attach the subtracted number to receive with the retention notification. Output the information to the transmitter,
When the number obtained by subtracting 1 from the transfer residual number attached to the holding notification is 0, nothing is output,
If the number obtained by subtracting 1 from the transfer residual number attached to the recovery notification is not 0, specify a port number that is different from the port number that received the recovery notification, and attach the subtracted number to receive it along with the recovery notification. Output the information to the transmitter,
A configuration information transfer unit that outputs nothing when the number obtained by subtracting 1 from the transfer remaining number attached to the recovery notification is 0;
The node according to claim 6, wherein the backup information reading unit further attaches a transfer residual number indicating a transfer count to the holding notification or the recovery notification.   The node according to claim 1, wherein the configuration information includes at least one of an IP address, a node name, and VLAN information.   A network system comprising a plurality of nodes according to any one of claims 1 to 8 connected via the port.

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