JP2014143523A - Network management device, communication device, communication system, network management method, and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for efficiently using a communication resource for a detour for a path in a network composed of a plurality of nodes.SOLUTION: A network management device comprises: a path information storage unit 21 for storing a communication path between two nodes and an assigned communication resource; a communication resource management information storage unit 22 for storing an assignment situation of each communication resource; an assignment situation determination unit 23 for determining an assignment situation of a communication resource to be assigned to a path before registration; a normal path registration unit 24 which notifies each node on a normal path of path setting, registers the normal path to the path information storage unit 21, and updates an assignment situation of an assigned communication resource, when a communication resource to be assigned is not assigned to another path already assigned in the case of registering the normal path; and a standby path registration unit 25 which registers a standby path to the path information storage unit 21 and updates an assignment situation of an assigned communication resource, when a communication resource to be assigned is not assigned to another normal path already assigned in the case of registering the standby path.

Description

  The present invention relates to a technique for managing communication resources in a communication system.

  A communication system including a plurality of communication devices (nodes) has various redundant configurations, thereby improving the reliability of communication in an end-to-end path. However, for example, in a communication system that operates many paths within a limited communication resource of a small network, redundancy cannot be ensured for all paths, and a redundant configuration can be built only for some paths. There is.

  Paths that are not redundantly configured require a temporary detour when a communication failure occurs or when a package is replaced. However, if a detour is constructed when it becomes necessary, additional communication resources and operational costs are required each time. Here, the communication resource refers to a resource used to logically divide a physical transmission path in multiplex communication. Such communication resources include, for example, time slots in a TDM (Time Division Multiplex) network and wavelengths in a WDM (Wavelength Division Multiplex) network. Such unplanned addition of communication resources and construction of a detour as needed necessitates the inefficiency of communication resource utilization.

  An example of a technique related to such a problem is described in Patent Document 1. In this related technology, when setting a working path from a start point node to an end point node, a plurality of backup paths starting from each node on the working path are set.

  Another example of the technology related to the above problem is described in Patent Document 2. In this related technique, a certain node on the working path reserves a protection path by transferring a protection path reservation setting message to a detour that does not pass through the working path to a node downstream from the node. Then, the node on the working path that is the end of the protection path repeats the transfer of the protection path reservation setting message to the detour that does not pass through the working path to the downstream node in a chain manner.

JP 2002-344491 A Japanese Patent Laying-Open No. 2005-210514

  However, the related techniques described in Patent Document 1 and Patent Document 2 have the following problems.

  Patent Document 1 describes that a plurality of backup paths that are not used at the same time can share communication resources in a link between the same nodes. However, Patent Document 1 does not describe details of how to manage shared communication resources.

  Japanese Patent Application Laid-Open No. 2004-228561 describes that the amount of communication resources necessary for a common node on a plurality of backup paths is calculated when communication resources are shared by a plurality of backup paths. However, Patent Document 2 does not describe details of how to manage shared communication resources.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a technique for managing communication resources for detours with respect to paths in a network composed of a plurality of nodes so as to efficiently use the resources. To do.

  The network management apparatus of the present invention assigns each of two sets of a plurality of communication apparatuses (nodes) capable of communicating with each other to a normal or backup communication path (path) between the two nodes and the path. A path information storage unit for storing path information including information representing each of the one or more communication resources, and a communication resource management information storage unit for storing allocation status information indicating an allocation status for the path for each communication resource When the path information before registration is input, an allocation for determining the allocation status of one or more communication resources allocated to the path indicated by the path information with reference to the communication resource management information storage unit When the status determination unit and the input path information indicate a normal path before registration, one or more communication paths allocated to the normal path before registration. When the allocation status determination unit determines that no resource is allocated to any other registered path, the route setting based on the input path information is notified to each node on the normal path. A normal path registration unit that registers the input path information in the path information storage unit and updates the allocation status information for one or more communication resources allocated to the normal path; and the input path When the information indicates a backup path before registration, the allocation status determination is made if any one or more communication resources allocated to the backup path before registration are not allocated to the other registered normal paths. One or more communication resources that register the input path information in the path information storage unit and that are allocated to the backup path, if determined by the unit And a backup path registration section that updates the allocation status information about.

  In addition, when the communication apparatus of the present invention is notified by the above-described network management apparatus to perform route setting based on the path information, the path between itself and another communication apparatus adjacent to the own apparatus on the path A path setting unit configured to set a path to perform communication using the communication resource allocated to the multiplex communication unit, and a multiplex communication unit configured to perform multiplex communication with the other communication device based on the setting by the path setting unit. .

  Moreover, the communication system of this invention is provided with the above-mentioned network management apparatus and the above-mentioned communication apparatus.

  Further, the network management method of the present invention provides a normal or backup communication path (path) between the two nodes for each of two sets of a plurality of communication devices (nodes) capable of communicating with each other, and the path. A path information storage unit that stores path information including information representing each of one or more communication resources allocated to the communication resource, and communication resource management information that stores allocation status information indicating an allocation status for the path for each communication resource When the path information before registration is input using the storage unit, the allocation status of one or more communication resources allocated to the path indicated by the path information is referred to the communication resource management information storage unit If the input path information indicates a normal path before registration, one or more communication resources assigned to the normal path before registration are determined. When it is determined that no source is assigned to any other registered path, the route setting based on the input path information is notified to each node on the normal path, and the input When path information is registered in the path information storage unit, the allocation status information is updated for one or more communication resources allocated to the normal path, and the input path information indicates a spare path before registration , If it is determined that none of the one or more communication resources allocated to the backup path before registration is allocated to the other registered normal path, the input path information is converted to the path information. The allocation status information is updated for one or more communication resources to be registered in the storage unit and allocated to the backup path.

  Further, the computer program of the present invention provides, for each of two sets of a plurality of communication devices (nodes) capable of communicating with each other, a normal or backup communication path (path) between the two nodes, and the path A path information storage unit that stores path information including information representing each of one or more communication resources allocated to the communication resource, and communication resource management information that stores allocation status information indicating an allocation status for the path for each communication resource When the path information before registration is input using the storage unit, the allocation status of one or more communication resources allocated to the path indicated by the path information is referred to the communication resource management information storage unit And when the input path information indicates a normal path before registration, it is assigned to the normal path before registration. When it is determined in the allocation status determination step that none of the one or more communication resources to be allocated is allocated to the other registered path, the route setting based on the input path information is performed in the normal path. A normal path registration step of notifying each node on the path, registering the input path information in the path information storage unit, and updating the allocation status information for one or more communication resources allocated to the normal path; When the input path information indicates a backup path before registration, one or more communication resources allocated to the backup path before registration are all allocated to the other registered normal paths. If it is determined in the allocation status determination step, the input path information is registered in the path information storage unit and assigned to the spare path. A backup path registration updating the allocation status information for one or more communication resources that causes the computer to execute an apparatus.

  INDUSTRIAL APPLICABILITY The present invention can provide a technique for managing so as to efficiently use communication resources for a detour for a path in a network composed of a plurality of nodes.

It is a block diagram which shows the structure of the communication system as the 1st Embodiment of this invention. It is a functional block diagram of the communication system as a 1st embodiment of the present invention. It is a figure which shows an example of the hardware constitutions of the communication apparatus in the 1st Embodiment of this invention. It is a figure which shows an example of the hardware constitutions of the network management apparatus in the 1st Embodiment of this invention. It is a figure which shows an example of the information memorize | stored in the path information storage part in the 1st Embodiment of this invention. It is a figure which shows an example of the information memorize | stored in the communication resource management information storage part in the 1st Embodiment of this invention. It is a flowchart explaining the path | pass registration operation | movement of the communication system as the 1st Embodiment of this invention. It is a figure which shows the specific example of a structure of the communication system as the 1st Embodiment of this invention. It is a figure which shows an example of the information memorize | stored in the communication resource management information storage part before path | pass registration in the specific example of the 1st Embodiment of this invention. It is a figure which shows an example of the normal path | pass memorize | stored in the path information storage part in the specific example of the 1st Embodiment of this invention. It is a figure which shows an example of the information updated in a communication resource management information storage part at the time of normal path registration in the specific example of the 1st Embodiment of this invention. It is a figure which shows typically the normal path | pass registered in the specific example of the 1st Embodiment of this invention. It is a figure which shows an example of the backup path with respect to the normal path memorize | stored in the path information storage part in the specific example of the 1st Embodiment of this invention. It is a figure which shows an example of the information updated in a communication resource management information storage part at the time of backup path registration in the specific example of the 1st Embodiment of this invention. It is a figure which shows typically the normal path and backup path which were registered in the specific example of the 1st Embodiment of this invention. It is a figure which shows an example of the other normal path memorize | stored in the path information storage part in the specific example of the 1st Embodiment of this invention. It is a figure which shows an example of the information updated in a communication resource management information storage part at the time of the other normal path registration in the specific example of the 1st Embodiment of this invention. It is a figure which shows typically the other normal path | pass registered in the specific example of the 1st Embodiment of this invention. It is a figure which shows an example of the backup path with respect to the other normal path memorize | stored in the path information storage part in the specific example of the 1st Embodiment of this invention. It is a figure which shows typically the path group registered in the specific example of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the communication system as the 2nd Embodiment of this invention. It is a functional block diagram of the communication system as the 2nd Embodiment of this invention. It is a figure which shows an example of the information memorize | stored in the path | pass information storage part in the 2nd Embodiment of this invention. It is a figure which shows an example of the information memorize | stored in the communication resource management information storage part in the 2nd Embodiment of this invention. It is a flowchart explaining the path switching operation | movement of the communication system as the 2nd Embodiment of this invention. It is a figure which shows an example of the information updated in a communication resource management information storage part at the time of path switching in the specific example of the 2nd Embodiment of this invention. It is a figure which shows an example of the information updated by the path information storage part at the time of path switching in the specific example of the 2nd Embodiment of this invention. It is a figure which shows typically the path group switched in the specific example of the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 shows a configuration of a communication system 1 as a first embodiment of the present invention. In FIG. 1, the communication system 1 includes a communication device 10 and a network management device 20. Hereinafter, the communication device 10 is also referred to as a node 10. The network management device 20 is communicably connected to a network 100 composed of a plurality of nodes 10. Each node 10 is communicably connected to one or more other nodes 10 in the network 100. Although FIG. 1 shows four communication devices 10 and one network management device 20, the number of devices in the communication system of the present invention is not limited.

  The node 10 is a communication device that performs multiplex communication and has a cross-connect function. The cross-connect function is a function for arbitrarily setting a route between a plurality of multiplexed input / output signals. That is, based on which communication resource is used to input each signal that has been multiplexed and input from which other node 10, the node 10 uses which communication resource to transmit the signal. Whether to output to the node 10 is set, and signals are multiplexed and output for each route according to the setting. Here, the communication resource refers to a resource used to logically divide a physical transmission path in multiplex communication. For example, communication resources include time slots in TDM (Time Division Multiplex), wavelengths in a WDM (Wavelength Division Multiplex) network, and the like. Each node 10 is preinstalled with one or more communication resources that can be used for communication with other nodes.

  Next, FIG. 2 shows functional blocks of each device constituting the communication system 1. In FIG. 2, the node 10 includes a path setting unit 11 and a multiplex communication unit 12. The network management device 20 includes a path information storage unit 21, a communication resource management information storage unit 22, an allocation status determination unit 23, a normal path registration unit 24, and a backup path registration unit 25.

  Here, an example of the hardware configuration of each device constituting the communication system 1 is shown in FIGS.

  3, the node 10 includes one or more interfaces 1001, a switch 1002, and a control unit 1003 including a processor and a memory.

  The interface 1001 is connected to another node 10, the network management device 20, or other external device via a link. The interface 1001 separates multiplexed signals input via the link and outputs the separated signals to the switch 1002. The interface 1001 multiplexes signals input from the switch 1002 and outputs the multiplexed signals via a link.

  The switch 1002 sets the path of the signal input from each interface 1001 and outputs it to an appropriate interface 1001.

  The memory of the control unit 1003 stores a computer program and various data for causing the apparatus to function as the node 10 of the present embodiment. The control unit 1003 controls the path setting of the switch 1002 by reading and executing the computer program and various data stored in the memory. The path setting unit 11 described above is configured by the control unit 1003. The multiplex communication unit 12 includes an interface 1001 and a switch 1002. Note that the hardware configuration configuring the node 10 and each functional block thereof is not limited to the above-described configuration.

  4, the network management apparatus 20 includes a processor 2001, a memory 2002, a storage device 2003 such as a hard disk, a network interface 2004, an input device 2005, and an output device 2006.

  The storage device 2003 stores a computer program and various data for causing the device to function as the network management device 20 of the present embodiment.

  The processor 2001 manages communication in the communication system 1 by reading the computer program and various data stored in the storage device 2003 into the memory 2002 and executing them.

  The network interface 2004 communicates with the node 10 via the network 100.

  The path information storage unit 21 and the communication resource management information storage unit 22 described above are configured by the storage device 2003. The allocation status determination unit 23 includes an input device 2005 and a processor 2001 that reads a computer program and various data stored in the storage device 2003 into the memory 2002 and executes them. The normal path registration unit 24 includes a network interface 2004 and a processor 2001 that reads a computer program and various data stored in the storage device 2003 into the memory 2002 and executes them. The backup path registration unit 25 includes a processor 2001 that reads a computer program and various data stored in the storage device 2003 into the memory 2002 and executes the program. Note that the hardware configuration of the network management device 20 and each functional block thereof is not limited to the above-described configuration.

  Note that the network management device 20 may not be connected to each node 10 so as to be able to communicate directly. The network management device 20 may communicate with each node 10 by being connected to any one of the nodes 10. Alternatively, the network management device 20 may be connected to the network 100 configured by the nodes 10 via another network.

  Next, details of the functional blocks of the node 10 will be described.

  The path setting unit 11 sets a working path in its own device based on information notified from the network management device 20. Specifically, the path setting unit 11 receives information representing the path of the working path and the communication resource to be used from the network management apparatus 20. Then, the path setting unit 11 notifies the adjacent node 10 of the signal input using the notified communication resource from one node 10 adjacent to the own device on the notified route. Set the path to output using the specified communication resource.

  The multiplex communication unit 12 performs multiplex communication with other nodes 10 based on the setting by the path setting unit 11.

  Next, details of each functional block of the network management apparatus 20 will be described.

  The path information storage unit 21 stores path information related to a communication path (path) between any two nodes 10 (endpoint nodes). Specifically, the path information storage unit 21 stores path information including information representing a normal or backup communication path (path) between two nodes and one or more communication resources allocated to the path. doing. Here, a backup path (backup path) is a communication path different from a normal path (normal path) between end point nodes.

  For example, an example of the path information stored in the path information storage unit 21 is shown in FIG. In FIG. 5, each row represents path information. In this example, the path information includes a path ID, end point information, normal path route information, normal path resource information, protection path route information, and protection path resource information.

  The path ID is information for identifying a path. In the example of FIG. 5, the path ID is represented by #N. Hereinafter, the path with path ID #N is also referred to as path #N.

  The end point information represents two end point nodes. In the example of FIG. 5, the end point information “A, C” of the path # 2 represents that the identifiers of the end point node 10 are “A” and “C”, respectively. Hereinafter, the node 10 having the identifier “X” is also referred to as a node 10X.

  In the example of FIG. 5, the normal path route information “A-E-F-C” of the path # 2 represents a normal communication route between the node 10A and the node 10C that are end point nodes. In this example, the normal path route information is represented as a list in which the identification information of the nodes 10 on the normal path are arranged in order.

  In the example of FIG. 5, the normal path resource information “ch7” of the path # 2 indicates that the communication resource of the channel 7 (ch7) is allocated to the normal path. Specifically, this normal path resource information is obtained by referring to the normal path “A-E-F-C”, the ch 7 in the link “A-E”, the ch 7 in “E-F”, and the “F-C”. This shows that three communication resources of ch7 are allocated. The link “XY” refers to a link connecting the node 10X and the node 10Y.

  Further, in the example of FIG. 5, the backup path route information “ABC” of the path # 2 represents a communication route different from the normal path between the node 10A and the node 10C as the end point nodes. In this example, the backup path route information is also expressed as a list in which the identification information of the nodes 10 on the route are arranged in order, like the normal path route information.

  In the example of FIG. 5, the protection path resource information “ch2” of path # 2 indicates that the communication resource of channel 2 (ch2) is allocated to the protection path. Specifically, in this protection path resource information, two communication resources of ch2 in the link “A-B” and ch2 in “B-C” are allocated to the protection path “ABC”. It represents that.

  The communication resource management information storage unit 22 stores allocation status information regarding each communication resource. For example, assume that there are N links connecting the nodes 10 in the network 100. Further, it is assumed that n communication resources are implemented in each node 10. In this case, the communication resource management information storage unit 22 stores allocation status information for each of n communication resources in each of N links. The allocation status information is information representing an allocation status for each communication resource path. For example, the allocation status information may be information indicating any of a shared resource, a dedicated resource, and an unallocated resource. Here, the shared resource is a communication resource that can be shared and allocated to a plurality of backup paths. A dedicated resource is a communication resource allocated exclusively for one normal path. An unassigned resource is a communication resource that has not been assigned to any path.

  For example, an example of allocation status information stored in the communication resource management information storage unit 22 is shown in FIG. In FIG. 6, for example, each of the first to n-th rows indicates allocation status information regarding n communication resources (ch1 to chn) that can be used in the link “AB” between the node 10A and the node 10B. Represents. In the example of FIG. 6, the communication resources of ch1 and ch2 in the link “AB” are shared resources. Further, the communication resources of ch3 and ch4 of the link “A-B” are exclusive resources. In addition, the communication resource of ch5 of the link “A-B” is an unallocated resource. Note that the communication resource management information storage unit 22 may store allocation status information represented by 2 bits for each communication resource of each link. For example, as shown in FIG. 6, the shared resource may be represented by “01”, the dedicated resource may be represented by “11”, and the unallocated resource may be represented by “00”. In addition, the allocation status information may be in any format as long as it is information indicating the allocation status for each communication resource path.

  When the path information before registration is input, the allocation status determination unit 23 refers to the communication resource management information storage unit 22 to determine the allocation status for one or more communication resources allocated to the path indicated by the path information. to decide.

  The allocation status determination unit 23 may acquire path information via the input device 2005. Alternatively, the allocation status determination unit 23 may acquire path information from an operator terminal (not shown) connected to be communicable.

  The normal path registration unit 24 is configured to function when the input path information indicates a normal path before registration. The path information indicating the normal path before registration includes route information as a normal path and information indicating a communication resource scheduled to be allocated to the normal path.

  The normal path registration unit 24 determines that the allocation status for one or more communication resources scheduled to be allocated to the normal path before registration is not allocated to any other path by the allocation status determination unit 23. The following processing is performed. For example, the normal path registration unit 24 may perform the following process when one or more communication resources scheduled to be allocated to the normal path before registration are all unallocated resources.

  Specifically, the normal path registration unit 24 notifies each node 10 on the input normal path to perform route setting based on the path information. For example, the normal path registration unit 24 sends information input to each corresponding node 10 from the adjacent node 10 on the normal path using the communication resource to the other node 10. What is necessary is just to transmit the message which requests | requires the setting of a cross connection so that it may output using a communication resource.

  In addition, when the normal path registration unit 24 succeeds in setting the normal path, the normal path registration unit 24 registers the path information indicating the input normal path in the path information storage unit 21. For example, the normal path registration unit 24 registers the path information to which the new path ID is assigned, and the information and communication indicating the path of the input normal path in the normal path path information and the normal path resource information of the path information. What is necessary is just to set the information showing a resource.

  Also, the normal path registration unit 24 updates the communication resource management information storage unit 22 when the normal path setting is successful. For example, the normal path registration unit 24 may update the allocation status information for each communication resource allocated to the normal path to “exclusive resource”.

  When the normal path registration unit 24 assigns at least one of one or more communication resources scheduled to be assigned to the input normal path to another path (for example, a dedicated resource or a shared resource). Does not perform normal path setting and registration. In this case, for example, the normal path registration unit 24 may output, to the output device 2006, a message indicating that the communication resource is already assigned to another path and cannot be assigned as a dedicated resource.

  The backup path registration unit 25 is configured to function when the input path information indicates a backup path before registration. The path information indicating the backup path before registration includes route information as a backup path and information indicating a communication resource scheduled to be assigned to the backup path. In addition, the path information indicating the backup path before registration may include information on a path ID and an end point node as information that can specify which normal path is the backup path.

  Further, the backup path registration unit 25 indicates that the allocation status of one or more communication resources scheduled to be allocated to the backup path before registration indicates that none of the allocation status is allocated to another normal path. If the determination is made at step 23, the following processing is performed. For example, the protection path registration unit 25 may perform the following process when one or more communication resources scheduled to be assigned to the protection path before registration are shared resources or unallocated resources.

  Specifically, the protection path registration unit 25 registers path information representing the protection path in the path information storage unit 21. Specifically, the backup path registration unit 25 searches the path information storage unit 21 for path information including a normal path corresponding to the input backup path. Then, the protection path registration unit 25 may set the information indicating the route of the input protection path and the information indicating the communication resource in the protection path route information and the protection path resource information of the searched path information.

  Further, the protection path registration unit 25 updates the communication resource management information storage unit 22. For example, the protection path registration unit 25 may update the allocation status information to “shared resource” for each communication resource allocated to the protection path.

  Note that the protection path registration unit 25 does not notify each node 10 on the route of the route setting when registering the protection path.

  The backup path registration unit 25 also assigns at least one of one or more communication resources scheduled to be assigned to the input backup path to another normal path (for example, a dedicated resource). Does not register a backup path. In this case, for example, the backup path registration unit 25 may output to the output device 2006 a message indicating that the communication resource is already allocated by another normal path and cannot be assigned as a shared resource.

  The operation of the communication system 1 configured as described above will be described with reference to FIG.

  First, the allocation status determination unit 23 acquires path information before registration input from the outside (step S1). The pre-registration path information input here includes at least information representing a normal path or backup path and information representing one or more communication resources to be allocated to the path. Further, as described above, when the input path information represents a backup path before registration, the input path information includes information such as a path ID and an end node that can identify the corresponding normal path. May be.

  Next, the allocation status determination unit 23 acquires allocation status information regarding one or more communication resources acquired in step S1 from the communication resource management information storage unit 22 (step S2).

  Next, the allocation status determination unit 23 determines whether the path information acquired in step S1 represents a normal path before registration or a backup path before registration (step S3).

  Here, when representing a normal path before registration, the allocation status determination unit 23 determines whether the allocation status of each communication resource acquired in step S2 is not allocated to any other path (step S4). ).

  For example, when the allocation status information is represented by 2-bit information, the unallocated resource is “00”, the shared resource is “01”, and the dedicated resource is “11”, the allocation status determination unit 23 Whether or not each communication resource is an unallocated resource that is not allocated to another path may be determined based on whether or not the first bit is 0.

  If it is determined that at least one of the communication resources is assigned to another path, the normal path registration unit 24 determines that the input normal path cannot be registered, and ends the operation. In this case, the normal path registration unit 24 may output a message indicating that this communication resource cannot be assigned to the normal path.

  On the other hand, if it is determined in step S4 that each communication resource is not assigned to any other path, the normal path registration unit 24 sends this path information to each node 10 on the input normal path. The route setting based on is notified (step S5).

  Next, the normal path registration unit 24 registers path information representing this normal path in the path information storage unit 21 (step S6). For example, the normal path registration unit 24 registers path information with a new path ID, sets information indicating the path of the input normal path in the normal path path information, and sets the normal path resource information in the normal path resource information. Information representing one or more input communication resources is set.

  Next, the normal path registration unit 24 updates the allocation status information stored in the communication resource management information storage unit 22 for one or more communication resources allocated to the normal path registered in step S6 (step S7). For example, the normal path registration unit 24 may update the allocation status information of each corresponding communication resource to “exclusive resource”.

  If the normal path registration is not successful in step S5, the normal path registration unit 24 ends the operation without executing steps S6 to S7. In this case, the normal path registration unit 24 may output a message indicating that the normal path route setting has failed.

  On the other hand, if it is determined in step S3 that the path information acquired in step S1 indicates a backup path before registration, the allocation status determination unit 23 determines which allocation status of each communication resource acquired in step S2 is. Is also determined whether it is not assigned to another normal path (step S8).

  For example, when the allocation status information is represented by 2-bit information as described above, the allocation status determination unit 23 is allocated to another normal path depending on whether the second bit from the upper level is 0 or not. It may be determined whether or not there are no shared resources or unallocated resources.

  Here, when it is determined that at least one of the communication resources is allocated to another normal path (for example, a dedicated resource), the backup path registration unit 25 cannot register the input backup path. The operation is terminated. At this time, the protection path registration unit 25 may output a message indicating that this communication resource cannot be assigned to the protection path.

  On the other hand, if it is determined in step S8 that none of the communication resources are assigned to another normal path, the backup path registration unit 25 stores path information representing this backup path in the path information storage unit 21. Register (step S9). For example, the backup path registration unit 25 searches the path information storage unit 21 for path information to which the path ID included in the path information input in step S1 is assigned. Then, the protection path registration unit 25 sets information indicating the route of the input protection path in the protection path route information of the searched path information, and one or more input communication resources are input to the protection path resource information. Set the information indicating.

  Next, the protection path registration unit 25 updates the allocation status information stored in the communication resource management information storage unit 22 for each communication resource allocated to the protection path registered in step S9 (step S10). For example, the protection path registration unit 25 may update the allocation status information for each corresponding communication resource to “shared resource”.

  Thus, the communication system 1 finishes the path registration operation.

  Next, the operation of the communication system 1 will be shown as a specific example.

  First, the configuration of the communication system 1 described in this specific example is shown in FIG. In FIG. 8, the communication system 1 includes six nodes 10 having identifiers “A” to “F” and a network management device 20. A solid line connecting the nodes 10A to 10F represents a link connecting the nodes 10 to each other. That is, in this example, there are seven links between each node 10. In this example, each node 10 has 88 channels of communication resources from ch1 to ch88, and can register 88 paths.

  In this case, the communication resource management information storage unit 22 stores the allocation status information for 88 communication resources that can be used in communication performed via each of the seven links. In this specific example, an example of information stored in the communication resource management information storage unit 22 is shown in FIG. In FIG. 9, since no single path has been registered yet, all communication resources are unallocated resources.

  In such a specific example, an operation in which the network management apparatus 20 registers the normal path and the backup path between the nodes 10E and 10F and the normal path and the backup path between the nodes 10A and 10C will be described.

<Registering normal path between node 10E and node 10F>
First, an operation in which the network management apparatus 20 registers a normal path between the node 10E and the node 10F will be described.

  Here, first, the allocation status determination unit 23 acquires information indicating the route “EF” as the normal path before registration and information indicating the communication resource “ch2” to be allocated to the normal path. (Step S1).

  Next, the allocation status determination unit 23 acquires allocation status information of the communication resource “ch2” in the link “EF” on the path “EF” from the communication resource management information storage unit 22 (step S2). . Here, it is assumed that the allocation status determination unit 23 has acquired information representing “unallocated resources” from the communication resource management information storage unit 22 illustrated in FIG. 9.

  Since the input path information represents a normal path before registration (“normal path” in step S3) and the communication resource scheduled to be allocated to the normal path is “unallocated resource” (Yes in step S4), the network The operation of the management device 20 proceeds to step S5.

  That is, the normal path registration unit 24 notifies the route setting of the normal path “EF” using ch2 to the nodes 10E and 10F on the input normal path (step S5). As a result, the node 10E and the node 10F perform route setting of the normal path “EF” using ch2.

  Then, the normal path registration unit 24 registers the path information assigned with the new path ID “# 1” in the path information storage unit 21, sets “EF” in the normal path route information, “Ch2” is set in the normal path resource information (step S6).

  Thereby, information as shown in FIG. 10 is stored in the path information storage unit 21.

  Next, the normal path registration unit 24 uses the allocation status information stored in the communication resource management information storage unit 22 for the communication resource “ch2” allocated to the link “EF” on the normal path “EF”. Update to “exclusive resources” (step S7).

  As a result, information as shown in FIG. 11 is stored in the communication resource management information storage unit 22. In FIG. 11, information shown in bold represents information updated in the communication resource management information storage unit 22.

  FIG. 12 schematically shows a state in which the normal path “EF” of the path # 1 is set as the working path in this way. In FIG. 12, rectangles to which reference numerals ch1 to ch88 are attached represent 88 channel communication resources that can be used in each link. A rectangle filled with a diagonal line pattern represents “exclusive resource”. A rectangle surrounded by a double line represents a communication resource used by the corresponding node 10 in the corresponding link. That is, in FIG. 12, the communication resource of “ch2” in the link “EF” is a dedicated resource and is used by the node 10E and the node 10F.

<Operation of Registering Backup Path Between Node 10E and Node 10F>
Next, the operation in which the network management apparatus 20 registers a protection path for the normal path between the node 10E and the node 10F will be described.

  Here, first, the allocation status determination unit 23 includes information indicating the route “E-A-B-C-F” as the backup path before registration of the path # 1, and the communication resource scheduled to be allocated to this backup path. Information representing “ch2” is acquired (step S1).

  Next, the allocation status determination unit 23 acquires the allocation status information of the communication resource “ch2” in each link on the path “E-A-B-C-F” from the communication resource management information storage unit 22 ( Step S2). Here, the allocation status determination unit 23 receives each of the links “EA”, “AB”, “BC”, and “CF” from the communication resource management information storage unit 22 shown in FIG. It is assumed that information indicating “unallocated resource” is acquired for the communication resource “ch2”.

  The input path information represents a backup path before registration (“backup path” in step S3), and each communication resource scheduled to be assigned to the backup path is an “unassigned resource” (in step S8). Yes), the operation of the network management device 20 proceeds to step S9.

  That is, the backup path registration unit 25 sets “E-A-B-C-F” as the backup path route information of the path information of the path # 1 in the path information storage unit 21, and sets “ ch2 "is set (step S9).

  As a result, information as shown in FIG. 13 is stored in the path information storage unit 21.

  Next, the protection path registration unit 25 assigns the allocation status information stored in the communication resource management information storage unit 22 for the communication resource “ch2” allocated to each link on the protection path “E-A-B-C-F”. Is updated to “shared resource” (step S10).

  As a result, information as shown in FIG. 14 is stored in the communication resource management information storage unit 22.

  FIG. 15 schematically shows a state in which the backup path “E-A-B-C-F” using ch2 is secured for the path # 1. In the following drawings, a rectangle filled with a dot pattern represents a “shared resource”. That is, in FIG. 15, each communication resource of “ch2” in the links “EA”, “AB”, “BC”, and “CF” is a shared resource. Note that the communication resource “ch2” in each of these links is managed as a shared resource in the communication resource management information storage unit 22 of the network management device 20, but is not used by the corresponding node 10.

<Registration operation of normal path between node 10A and node 10C>
Next, an operation in which the network management apparatus 20 registers a normal path between the node 10A and the node 10C will be described.

  First, the allocation status determination unit 23 acquires information representing the route “A-E-F-C” as a normal path before registration and information representing the communication resource “ch7” to be allocated to this normal path. (Step S1).

  Next, the allocation status determination unit 23 acquires the allocation status information of the communication resource “ch7” in each link on the path “A-E-F-C” from the communication resource management information storage unit 22 (step S2). ). Here, the allocation status determination unit 23 receives each communication resource “ch7” in the links “AE”, “EF”, and “FC” from the communication resource management information storage unit 22 illustrated in FIG. ”, Information indicating“ unallocated resource ”is acquired.

  The input path information represents the normal path before registration (“normal path” in step S3), and any of the communication resources scheduled to be allocated to the normal path is “unallocated resource” (Yes in step S4). ) The operation of the network management device 20 proceeds to step S5.

  That is, the normal path registration unit 24 sets the path of the normal path “A-E-F-C” using ch7 for the nodes 10A, 10E, 10F, and 10C on the input normal path. Notification is made (step S5). As a result, the node 10A, the node 10E, the node 10F, and the node 10C perform communication route setting using the ch7 with the adjacent node 10.

  Then, the normal path registration unit 24 registers the path information with the new path ID “# 2” in the path information storage unit 21, and “A-E-F-C” is included in the normal path route information. And “ch7” is set in the normal path resource information (step S6).

  As a result, information as shown in FIG. 16 is stored in the path information storage unit 21.

  Next, the normal path registration unit 24 assigns the allocation status information stored in the communication resource management information storage unit 22 for the normal path resource “ch7” in each link on the normal path “A-E-F-C” to “ Update to “exclusive resources” (step S7).

  Thereby, information as shown in FIG. 17 is stored in the communication resource management information storage unit 22.

  FIG. 18 schematically shows a state in which the normal path of path # 2 is set as the working path in addition to the normal path (working path) and backup path of path # 1 in this way. In FIG. 18, the communication resources of “ch7” in the links “AE”, “EF”, and “FC” are exclusive resources and are used by the corresponding node 10.

<Operation of Registering Backup Path Between Node 10A and Node 10C>
Next, the operation in which the network management apparatus 20 registers a protection path for the normal path between the node 10A and the node 10C will be described.

  First, the allocation status determination unit 23 includes information indicating the route “ABC” as a backup path before registration of the path # 2, and information indicating a communication resource “ch2” scheduled to be allocated to the backup path. Is acquired (step S1).

  Next, the allocation status determination unit 23 acquires the allocation status information of the communication resource “ch2” in each link on the path “ABC” from the communication resource management information storage unit 22 (step S2). Here, the allocation status determination unit 23 represents “shared resource” for the communication resource “ch2” in the links “AB” and “BC” from the communication resource management information storage unit 22 illustrated in FIG. 17. It is assumed that information has been acquired.

  The input path information represents a backup path before registration (“backup path” in step S3), and each communication resource scheduled to be allocated to the backup path is a “shared resource” (Yes in step S8). ) The operation of the network management device 20 proceeds to step S9.

  That is, the protection path registration unit 25 sets “ABC” in the protection path route information of the path information of the path # 2 in the path information storage unit 21, and sets “ch2” in the protection path resource information. (Step S9).

  Accordingly, information as shown in FIG. 19 is stored in the path information storage unit 21.

  Next, the protection path registration unit 25 uses the allocation status information stored in the communication resource management information storage unit 22 for the communication resource “ch2” allocated to each link on the protection path “ABC”. Update to “shared resource” (step S10). Here, the allocation status information of the communication resource “ch2” in the links “AB” and “BC” is already “shared resource”. In this case, the protection path registration unit 25 does not have to update the allocation status information.

  Therefore, the information stored in the communication resource management information storage unit 22 at this time is the same as that shown in FIG.

  FIG. 20 schematically shows a state in which the backup path “ABC” using ch2 is secured for the path # 2. As shown in FIG. 20, ch2 is shared and assigned to each protection path for path # 1 and path # 2 in link “AB” and link “BC”.

  This is the end of the description of the specific example.

  Next, effects of the first exemplary embodiment of the present invention will be described.

  The communication system according to the first exemplary embodiment of the present invention can manage so as to efficiently use communication resources for a detour for a path in a network including a plurality of nodes.

  The reason is that the communication resource management information storage unit of the network management device stores allocation status information indicating the allocation status for the path for each communication resource in the network, and the allocation status determination unit is scheduled to be allocated to the input path This is because the allocation status of communication resources is determined. Specifically, when the allocation status determination unit determines that none of each communication resource scheduled to be allocated to each link on the normal path before registration is allocated to another registered path, This is because the normal path registration unit notifies each node on the input normal path of the route setting based on the input path information. This is because the normal path registration unit registers the input path information indicating the normal path in the path information storage unit and updates the allocation status information for each communication resource allocated to the normal path. In addition, when the allocation status determination unit determines that none of the communication resources scheduled to be allocated to each link on the backup path before registration is assigned to another registered normal path, the backup path This is because the registration unit registers the input path information representing the protection path in the path information storage unit and updates the allocation status information for each communication resource allocated to the protection path.

  As described above, the network management device according to the first embodiment of the present invention has communication resources that are exclusively allocated to one normal path and communication resources that can be shared and allocated to a plurality of backup paths. And can be managed separately. As a result, the communication resources allocated to the normal path are exclusively used by the normal path, and are not allocated to other normal paths or backup paths. Further, the communication resources allocated to the protection path can be shared and allocated to other protection paths. As a result, the administrator using the network management apparatus according to the first embodiment of the present invention plans in advance which communication resources should be reserved in advance as a shareable communication resource in the network design stage. be able to. Therefore, this embodiment can also reduce operation costs.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to the drawings. Note that, in each drawing referred to in the description of the present embodiment, the same reference numerals are given to the same configuration and steps that operate in the same manner as in the first embodiment of the present invention, and the detailed description in the present embodiment. Description is omitted.

  First, FIG. 21 shows a configuration of a communication system 2 as a second embodiment of the present invention. In FIG. 21, the communication system 2 is different from the communication system 1 according to the first embodiment of the present invention in that a network management device 30 is provided instead of the network management device 20.

  FIG. 22 shows functional blocks of the network management device 30. In FIG. 22, the network management device 30 is different from the network management device 20 according to the first embodiment of the present invention in that it replaces the path information storage unit 21 with a path information storage unit 31 and a communication resource management information storage unit. 22 in that a communication resource management information storage unit 32 is provided, a normal path registration unit 34 is provided in place of the normal path registration unit 24, and a path switching unit 36 is provided.

  Here, the network management device 30 can be configured by hardware components similar to the network management device 20 described with reference to FIG. 4 in the first embodiment of the present invention. In this case, the path switching unit 36 includes a network interface 2004, an input device 2005, and a processor 2001 that reads a computer program and various data stored in the storage device 2003 into the memory 2002 and executes them. Note that the hardware configuration that configures the network management device 30 and each functional block thereof is not limited to the above-described configuration.

  In addition to the same information as in the first embodiment of the present invention, the path information storage unit 31 indicates that the working path set as the communication path between the endpoint nodes is the normal path and the backup path. The working path information indicating which one is stored is further stored.

  For example, an example of information stored in the path information storage unit 31 is shown in FIG. In FIG. 23, in both path # 1 and path # 2, the normal path is the working path.

  The communication resource management information storage unit 32 uses, for each communication resource that can be used between adjacent nodes 10 in the network 100, the usage status by the node 10 in addition to the allocation status information similar to that in the first embodiment of the present invention. Store information. The usage status information indicates whether or not the communication resource is used by the node 10 in communication via the link.

  For example, an example of information stored in the communication resource management information storage unit 32 is shown in FIG. In FIG. 24, for example, in the link “A-E” between the node 10A and the node 10E, the shared resource “ch2” is in an “OFF (not used)” state, and is a dedicated resource “ch7”. Is the “ON (used)” state.

  The normal path registration unit 34 is configured in the same manner as the normal path registration unit 24 in the first embodiment of the present invention. In addition, when registering a normal path in the path information storage unit 31, the normal path registration unit 34 “Normal path” is set in the working path information. In addition, the normal path registration unit 34 updates the use status information of the communication resource indicated by the registered normal path resource information to the “ON (used)” state.

  When the path switching information is input, the path switching unit 36 determines whether switching to the path indicated by the path switching information is possible. Here, the path switching information is information indicating a switching instruction as to which one of the normal path and the protection path is the active path. The path switching information includes information for specifying a path (such as a path ID and end point node information) and information indicating a path after switching (a normal path or a backup path). Specifically, the path switching unit 36 determines that switching is possible if switching to a normal path. This is because the communication resources allocated to the normal path are managed as exclusive resources and are not used by other working paths.

  In addition, when switching to the protection path, the path switching unit 36 determines whether or not the communication resource allocated to the protection path is used in communication using another working path. At this time, the path switching unit 36 may perform the determination process by referring to the usage status information for each communication resource stored in the communication resource management information storage unit 32. For example, the path switching unit 36 determines that switching to the protection path is possible if none of the communication resources allocated to the protection path is in use.

  In addition, if switching is possible, the path switching unit 36 executes path switching after canceling the setting of the working path. For example, the path switching unit 36 specifies each node 10 on the path set as the working path before switching by referring to the working path information in the path information storage unit 31. Then, the path switching unit 36 notifies each node 10 on the working path before switching to cancel the setting of the working path and release the used communication resource.

  Further, when the setting of the working path is successfully canceled, the path switching unit 36 sets the working path for each node 10 on the path indicated by the path switching information using the communication resource assigned to the path. Notice.

  Further, the path switching unit 36 updates the working path information in the path information storage unit 31 after successfully switching the path. Further, the path switching unit 36 updates the usage status information stored in the communication resource management information storage unit 32 for the communication resources whose usage status has changed due to the path switching. Specifically, the path switching unit 36 updates the usage status information regarding the communication resources released by releasing the working path before switching to information indicating the “OFF (not used)” state. In addition, the path switching unit 36 updates the usage status information regarding the communication resources used by the switched working path to information indicating the “ON (used)” state.

  The operation of the communication system 2 configured as described above will be described with reference to the drawings.

  First, the path registration operation of the communication system 2 will be described. The path registration operation of the communication system 2 is substantially the same as the path registration operation of the communication system 1 according to the first embodiment of the present invention described with reference to FIG. However, in the present embodiment, details of operations in step S6 and step S7 are different. When the normal path registration unit 34 registers the normal path in the path information storage unit 31 in step S6, the normal path registration unit 34 further sets “normal path” in the working path information in the registered path information. In step S7, the normal path registration unit 34 updates the allocation status information of the corresponding communication resource to “exclusive resource” in the communication resource management information storage unit 32, and further updates the usage status information to “ The information is updated to indicate the “ON (used)” state.

  Next, the path switching operation of the communication system 2 will be described with reference to FIG.

  First, the path switching unit 36 acquires path switching information (step S11). As described above, the path switching information includes information such as a path ID for specifying a path and information indicating a path after switching (normal path or backup path).

  Next, the path switching unit 36 determines whether the path switching information indicates switching to the normal path or switching to the backup path (step S12).

  Here, if it indicates switching to the normal path, the path switching unit 36 determines that switching is possible, and proceeds to step S14.

  On the other hand, when indicating switching to the protection path, the path switching unit 36 determines whether or not all of the one or more communication resources allocated to the protection path indicated by the path switching information are “OFF (not used)”. Is determined (step S13). Specifically, the path switching unit 36 refers to the path information storage unit 31 to identify each communication resource allocated to the protection path indicated by the path switching information. Then, the path switching unit 36 acquires the usage status information of each communication resource assigned to the protection path from the communication resource management information storage unit 32. Then, the path switching unit 36 may determine whether or not all of the acquired usage status information represents an “OFF (not used)” state.

  Here, if at least one of the one or more communication resources allocated to the protection path indicated by the path switching information is in the “ON (used)” state, the communication resource that is a shared resource is another The backup path is used by being set as the working path. Therefore, since it cannot switch to the backup path indicated by the path switching information, the communication system 2 ends the operation.

  On the other hand, if any of the one or more communication resources allocated to the protection path indicated by the path switching information is in the “OFF (not used)” state, the path switching unit 36 selects the protection indicated by the path switching information. It is determined that the path can be switched, and the process proceeds to step S14.

  In step S <b> 14, the path switching unit 36 identifies each node 10 on the working path by referring to the working path information in the path information storage unit 31. Specifically, the path switching unit 36 identifies each node 10 on the normal path if the working path information indicates a normal path, and each node on the protection path if the working path information indicates a protection path. 10 may be specified. Then, the path switching unit 36 notifies each node 10 on the working path to cancel the setting of the working path and release the used communication resources (step S14).

  Next, the path switching unit 36 notifies each node 10 on the path indicated by the path switching information to set the working path using each communication resource allocated to the path (step S15).

  If the processing in steps S14 to S15 is successful, the path switching unit 36 updates the communication resource management information storage unit 32 (step S16). Specifically, the path switching unit 36 updates the usage status information of the communication resource released in step S14 to information indicating the “OFF (not used)” state. Further, the path switching unit 36 updates the usage status information of the communication resources on the path set in step S15 to information indicating the “ON (used)” state.

  Next, the path switching unit 36 updates the working path information of the corresponding path information (step S17).

  Thus, the communication system 2 ends the path switching operation.

  Next, the operation of the communication system 2 will be shown as a specific example. The configuration of the communication system 2 in this specific example is the same as the configuration of the specific example of the communication system 1 described with reference to FIG. Further, it is assumed that the information shown in FIG. 23 is stored in the path information storage unit 31, and the information shown in FIG. 24 is stored in the communication resource management information storage unit 32.

  In such a specific example, an operation in which the network management apparatus 30 switches the working path of the path # 1 and an operation of switching the working path of the path # 2 will be described.

<Operation for switching the working path of path # 1 (normal path → backup path)>
First, the path switching unit 36 acquires information for instructing “switch to a backup path in path # 1” as path switching information (step S11).

  Since the path switching information indicates switching to the protection path (“protection path” in step S12), the path switching unit 36 is assigned to each link on the corresponding protection path “E-A-B-C-F”. The usage status information of the communication resource “ch2” is acquired from the communication resource management information storage unit 32 shown in FIG. In FIG. 24, since ch2 of each link is in the “OFF (not used)” state (Yes in step S13), the path switching unit 36 determines that it can be switched to the backup path indicated by the path switching information, and the step Proceed to S14.

  Therefore, the path switching unit 36 refers to the path information storage unit 31 to identify the node 10E and the node 10F on the normal path that is the working path of the path # 1. Then, the path switching unit 36 notifies the identified nodes 10E and 10F to cancel the setting of the working path and release the used communication resource “ch2” (step S14).

  Next, the path switching unit 36 uses the communication resources “ch2” allocated to the protection path for each of the nodes 10E, 10A, 10B, 10C, and 10F on the protection path indicated by the path switching information. Notification is made to set a path (step S15).

  If the processing in steps S14 to S15 is successful, the path switching unit 36 sets the usage status information of the communication resource “ch2” in the link “EF” released in step S14 to the “OFF (not used)” state. Update the information to represent. Further, the path switching unit 36 sets each communication resource “ch2” in each link “EA”, “AB”, “BC”, and “CF” on the backup path set in step S15. The usage status information is updated to information indicating the “ON (used)” state (step S16).

  As a result, information as shown in FIG. 26 is stored in the communication resource management information storage unit 32.

  Next, the path switching unit 36 updates the working path information of the path information of the path # 1 to “backup path” in the path information storage unit 31 (step S17).

  As a result, information as shown in FIG. 27 is stored in the path information storage unit 31.

  FIG. 28 schematically shows a state where the working path of path # 1 is changed from the normal path to the backup path in this way. In FIG. 28, a rectangle filled with a diagonal line pattern represents a communication resource managed as a dedicated resource by the network management device 30 as described above. Also, the rectangle filled with the dot pattern represents a communication resource managed as a shared resource by the network management device 30 as described above. Further, as described above, a rectangle surrounded by a double line represents a communication resource used by the node 10 in the corresponding link.

  In the state of FIG. 28, the communication resource “ch2” of the link “EF” is not used, but is a dedicated resource. In this state, consider a case where path information before registration for allocating the communication resource “ch2” to the link EF is input to the network management device 30. In this case, the network management device 30 operates in the same manner as in the first embodiment of the present invention, so that the communication resource “ch2” between the links EF is “exclusive resource”, and thus a new normal path It is determined that it is not allocated as a dedicated resource (or a shared resource for a new backup path). Therefore, in this case, the network management apparatus 30 does not register a new normal path (or backup path) that uses the communication resource “ch2”. As described above, the network management device 30 does not assign the communication resource managed as the exclusive resource to another normal path or backup path regardless of the usage status.

<Operation of switching the working path of path # 2 (normal path → backup path)>
The operation of the communication system 2 when the path switching information related to the path # 2 is acquired in the state of FIG.

  First, the path switching unit 36 acquires information instructing “switch to a backup path in path # 2” as path switching information (step S11).

  Since the path switching information indicates switching to the protection path (“protection path” in step S12), the path switching unit 36 uses the communication resource “assigned to each link on the corresponding protection path“ ABC ”. The usage status information of “ch2” is acquired from the communication resource management information storage unit 32 shown in FIG. In FIG. 26, “ch2” is in the “ON (used)” state in the links “AB” and “B-C” on the backup path “ABC” (step S13). No). Therefore, the path switching unit 36 determines that the protection path indicated by the path switching information cannot be switched. Then, the communication system 2 ends the operation.

  As described above, when a protection path is set as a working path between certain endpoint nodes, the network management apparatus 30 can share the shared resources used by the protection path between other endpoint nodes. Avoid switching to the backup path.

For example, it is assumed that there is a need for package replacement or the like in the node 10E and the node 10A in a state where a path group is set as shown in FIG. In this case, the communication system 2 can operate as follows, for example.
Step S21): First, the communication system 2 switches the working path of the path # 1 from the normal path to the backup path. Here, the package of the node 10E may be replaced by an administrator or the like.
Step S22): Next, the communication system 2 switches the working path of the path # 1 from the backup path to the normal path.
Step S23): Next, the communication system 2 switches the working path of path # 2 from the normal path to the backup path. Here, the package of the node 10A may be exchanged by an administrator or the like.
Step S24): Next, the communication system 2 switches the working path of path # 2 from the backup path to the normal path.

  Note that the communication system 2 may execute the operations of steps S21 to S24 according to the input of path switching information by the operator. Or the communication system 2 may perform the operation | movement of step S21-S24 according to acquisition of the path switching information output at the timing scheduled beforehand by the external schedule apparatus. Alternatively, the communication system 2 may execute the operations of steps S21 to S24 in response to acquisition of path switching information output by an external detection device that detects the start or end of maintenance work such as package replacement.

  Above, description of the specific example of operation | movement of the communication system 2 is complete | finished.

  Next, the effect of the second exemplary embodiment of the present invention will be described.

  The communication system according to the second exemplary embodiment of the present invention appropriately executes a switching operation to a detour while efficiently utilizing communication resources for a detour for a path in a network including a plurality of nodes. Can do.

  The reason is that when the path switching information indicating the path switching instruction is input, when the path switching unit is the switching instruction to the protection path, one or more communication resources allocated to the protection path are determined. Determine whether it is used by another protection path, and if it is not used, cancel the setting of the working path before switching and use its communication resources for each node on the protection path. This is because notification is made to set the working path. For this reason, the communication resource management information storage unit stores usage status information indicating whether or not each communication resource is used in communication on the working path. Also, for this purpose, the path information storage unit stores working path information indicating which of the normal path and the protection path is the working path.

  As a result, the network management apparatus according to the second embodiment of the present invention shares the communication resources for the different protection paths by using the low possibility that the protection paths for the different normal paths are required at the same time. Since the control is performed so as not to simultaneously switch to different protection paths sharing the same communication resource, the switching operation to the detour can be appropriately executed.

  In each of the above-described embodiments of the present invention, the example has been described in which one backup path can be set for each normal path. However, in each embodiment, a plurality of one normal path can be set. The backup path may be settable. In this case, the path information storage unit of each embodiment may store one or more backup path route information and its backup path resource information in one path information.

  In each embodiment of the present invention described above, the data structure of information stored in the path information storage unit and the communication resource management information storage unit is an example, and other data structures may be used. For example, the path information storage unit associates the path path information table in which the path information of the normal path and the backup path and the communication resource information are associated with the path ID, and the path information is associated with the working path information and the end node information. A path configuration information table may be stored.

  In each embodiment of the present invention described above, the allocation status determination unit has been described mainly with respect to an example of acquiring and registering path information from an input device or an operator terminal. In addition, the allocation status determination unit in each embodiment acquires and registers path information from an external device such as a path generation device that generates a normal path between endpoint nodes and its backup path in the communication system. Also good.

  Further, in the above-described second embodiment of the present invention, the description has focused on an example in which the path switching unit acquires path switching information from an input device or an operator terminal and executes switching. In addition, the path switching unit according to the second embodiment of the present invention acquires path switching information from an external device such as a failure path detection device that detects a path where a failure has occurred in the communication system, and performs switching. May be executed.

  In each embodiment of the present invention described above, the network management device may be configured by the same device as any one of the communication devices.

  In each of the embodiments of the present invention described above, the operation of the network management device described with reference to the flowcharts is stored in a storage device (storage medium) of the computer device as a computer program of the present invention. The computer program may be read and executed by the CPU (Central Processing Unit). In such a case, the present invention is constituted by the code of the computer program or a storage medium.

  Moreover, each embodiment mentioned above can be implemented in combination as appropriate.

  The present invention is not limited to the above-described embodiments, and can be implemented in various modes.

1, 2 Communication system 10 Communication device (node)
DESCRIPTION OF SYMBOLS 11 Path setting part 12 Multiplex communication part 20, 30 Network management apparatus 21, 31 Path information storage part 22, 32 Communication resource management information storage part 23 Allocation status judgment part 24, 34 Normal path registration part 25 Backup path registration part 36 Path switching Unit 100 network 1001 interface 1002 switch 1003 control unit 2001 processor 2002 memory 2003 storage device 2004 network interface 2005 input device 2006 output device

Claims (9)

For each of two sets of a plurality of communication devices (nodes) capable of communicating with each other, a normal or backup communication path (path) between the two nodes, and one or more communication resources allocated to the path A path information storage unit that stores path information including information representing
For each communication resource, a communication resource management information storage unit that stores allocation status information indicating an allocation status for the path;
When the path information before registration is input, an allocation status determination that determines the allocation status of one or more communication resources allocated to the path indicated by the path information with reference to the communication resource management information storage unit And
When the input path information indicates a normal path before registration, one or more communication resources allocated to the normal path before registration are not allocated to the other registered paths. When it is determined by the allocation status determination unit, it notifies each node on the normal path of the route setting based on the input path information, and registers the input path information in the path information storage unit. A normal path registration unit that updates the allocation status information for one or more communication resources allocated to the normal path;
When the input path information indicates a backup path before registration, any one or more communication resources allocated to the backup path before registration are not allocated to the other registered normal paths. And the allocation status determination unit registers the input path information in the path information storage unit and updates the allocation status information for one or more communication resources allocated to the backup path. A backup path registration unit;
Network management device with The communication resource management information storage unit has, as the allocation status information of each communication resource, a dedicated resource indicating that the communication resource is allocated exclusively to the normal path, and the backup path. Information indicating either a shared resource indicating that it is allocated so as to be sharable with another spare path, and an unallocated resource indicating that it is not allocated to the normal path or the backup path. Remember,
When the allocation status information stored in the communication resource management information storage unit regarding the one or more communication resources allocated to the normal path before the registration all represent the unallocated resources, the normal path registration unit It works when it is judged by the allocation status judgment part,
The backup path registration unit is configured such that the allocation status information stored in the communication resource management information storage unit for the one or more communication resources allocated to the backup path before registration is either the shared resource or the unallocated resource. The network management apparatus according to claim 1, wherein the network management apparatus functions when it is determined by the allocation status determination unit. The path information storage unit stores working path information indicating whether a path (working path) set as a communication path between any two nodes is the normal path or the backup path. Remember more,
The communication resource management information storage unit further stores usage status information indicating whether each communication resource is used in the working path;
When path switching information for instructing switching of the working path is input, none of the usage status information for one or more of the communication resources allocated to the path indicated by the path switching information is used. In this case, each node on the working path before switching is notified to cancel the route setting, and each node on the path indicated by the path switching information is set based on the path. And updating the usage status information for each communication resource whose usage status has changed due to switching, and updating the working path information for the pair of any two nodes whose working path has been changed by switching. The network management device according to claim 1 or 2. When notified from the network management device according to any one of claims 1 to 3 to perform route setting based on the path information, between itself and another adjacent communication device on the path A path setting unit configured to set a route to perform communication using the communication resource allocated to the path;
A multiplex communication unit that performs multiplex communication with the other communication device based on the setting by the path setting unit;
A communication device comprising: The network management device according to any one of claims 1 to 3,
A communication device according to claim 4;
A communication system comprising: For each of two sets of a plurality of communication devices (nodes) capable of communicating with each other, a normal or backup communication path (path) between the two nodes, and one or more communication resources allocated to the path A path information storage unit that stores path information including information representing
For each communication resource, using a communication resource management information storage unit that stores allocation status information indicating an allocation status for the path,
When the path information before registration is input, the allocation status of one or more communication resources allocated to the path indicated by the path information is determined with reference to the communication resource management information storage unit,
When the input path information indicates a normal path before registration, it is determined that none of the one or more communication resources allocated to the normal path before registration is allocated to another registered path. In such a case, the path setting based on the input path information is notified to each node on the normal path, and the input path information is registered in the path information storage unit and assigned to the normal path. Updating the allocation status information for one or more communication resources;
When the input path information indicates a backup path before registration, any one or more communication resources allocated to the backup path before registration are not allocated to the other registered normal paths. A network management method for registering the input path information in the path information storage unit and updating the allocation status information for one or more communication resources allocated to the backup path. The communication resource management information storage unit uses, as the allocation status information of each communication resource, a dedicated resource indicating that the communication resource is allocated exclusively to the normal path, and the backup path. Information indicating either a shared resource indicating that it is allocated so as to be sharable with another spare path, and an unallocated resource indicating that it is not allocated to the normal path or the backup path. When remembering
When it is determined that all the allocation status information stored in the communication resource management information storage unit regarding the one or more communication resources allocated to the normal path before registration represents the unallocated resource, the path setting Notification, registration of path information representing the normal path, and update of the allocation status information,
When it is determined that all of the allocation status information stored in the communication resource management information storage unit regarding the one or more communication resources allocated to the backup path before registration represent the shared resource or the unallocated resource The network management method according to claim 6, wherein registration of path information representing the backup path and update of the allocation status information are executed. For each of two sets of a plurality of communication devices (nodes) capable of communicating with each other, a normal or backup communication path (path) between the two nodes, and one or more communication resources allocated to the path A path information storage unit that stores path information including information representing
For each communication resource, using a communication resource management information storage unit that stores allocation status information indicating an allocation status for the path,
When the path information before registration is input, an allocation status determination that determines the allocation status of one or more communication resources allocated to the path indicated by the path information with reference to the communication resource management information storage unit Steps,
When the input path information indicates a normal path before registration, one or more communication resources allocated to the normal path before registration are not allocated to the other registered paths. When it is determined in the allocation status determination step, the route setting based on the input path information is notified to each node on the normal path, and the input path information is registered in the path information storage unit, A normal path registration step of updating the allocation status information for one or more communication resources allocated to the normal path;
When the input path information indicates a backup path before registration, any one or more communication resources allocated to the backup path before registration are not allocated to the other registered normal paths. And the allocation status determination step, the input path information is registered in the path information storage unit, and the allocation status information is updated for one or more communication resources allocated to the backup path. Backup path registration step;
Is a computer program that causes a computer device to execute. The communication resource management information storage unit uses, as the allocation status information of each communication resource, a dedicated resource indicating that the communication resource is allocated exclusively to the normal path, and the backup path. Information indicating either a shared resource indicating that it is allocated so as to be sharable with another spare path, and an unallocated resource indicating that it is not allocated to the normal path or the backup path. When remembering
In the allocation status determination step, it is determined that all allocation status information stored in the communication resource management information storage unit regarding the one or more communication resources allocated to the normal path before registration represents the unallocated resource. The normal path registration step is executed,
In the allocation status determination step, the allocation status information stored in the communication resource management information storage unit regarding one or more communication resources allocated to the backup path before registration is either the shared resource or the unallocated resource. The computer program according to claim 8, wherein the backup path registration step is executed when it is determined that the backup path is represented.