JP4456570B2 - Border node device, redundant path setting method, and redundant path setting program - Google Patents

Description

  The present invention relates to a boundary node device arranged at a boundary between a backbone network and a service network, and more particularly, to a redundant path setting method by the boundary node device.

2. Description of the Related Art Conventionally, a technology for establishing a path between boundary node devices in a communication system including a backbone network having a plurality of boundary node devices accommodating a certain service network and paths connecting the boundary node devices to each other is known. . As a path structure to be established, there is a redundant path (redundant path). This redundant path includes a path that can be used as a resource having a predetermined bandwidth (active side path) and a spare path (backup side path). The operation side path and the protection side path are uniquely associated, and the request conditions such as the bandwidth of the operation side path and the request conditions such as the bandwidth of the protection side path match. For example, when the bandwidth of the operating path is increased, the bandwidth of the backup path is increased in conjunction with the increase, and conversely, when the bandwidth of the operating path is decreased, the bandwidth of the backup path is decreased. It is known that the backup side path is used as a bypass path (see, for example, Non-Patent Document 1).
For example, when the traffic of this service network uses the operation side path as a resource, if a failure occurs in the operation side path, the backup side path can be used to bypass the traffic. As a result, traffic communication is continued.
JP Lang et al, “RSVP-TE Extensions in support of End-to-End Generalized Multi-Protocol Label Switching (GMPLS) -based Recovery”, [online], April 2005, CCAMP Working Group, [2006 1 March 19 search], Internet <URL: 1141024263453_0internet-drafts / draft-ietf-ccamp-gmpls-recovery-e2e-signaling-03.txt>

  In the conventional communication system, it is assumed that the boundary node device accommodates one service network. However, there is a demand for more effective utilization of redundant paths established in the backbone network as network resources. Thus, it is conceivable that the boundary node device is configured to accommodate a plurality of service networks. For example, different priority levels are assigned to two service networks, an operation-side path is assigned to one service network, and a backup-side path is assigned to the other.

  Under these assumptions, if a failure occurs on the operating path, traffic using the operating path is diverted to the backup path, and traffic communication on one service network with the higher priority is continued. Can be made. However, the other service network that has been using the backup path until then remains interrupted.

  Further, in the conventional path establishment method, the required conditions such as the bandwidth of the operating side path and the required conditions such as the bandwidth of the backup path are the same, so the established redundant path is allocated to the two service networks. Assuming that one service network is required to reduce the bandwidth of the operation side path, the bandwidth of the backup path used by the other service network is also reduced in conjunction. Therefore, there is a possibility of affecting the traffic communication of the other service network.

  Therefore, an object of the present invention is to provide a boundary node device, a redundant path setting method, and a redundant path setting program that can solve the above-described problems and can continue traffic communication of a plurality of service networks.

  In order to solve the above problem, the boundary node device according to claim 1 is a path connecting a plurality of boundary node devices accommodating the first service network and the second service network, and the plurality of boundary node devices to each other. And a redundant path including a first path that can be used as a resource having a predetermined bandwidth and a second path that is a spare paired with the first path. Path setting means for setting a plurality of paths, and one of the set redundant paths is provided as a resource for the first service network, and a second included in one of the set redundant paths Resource providing control means for controlling to provide a path as a resource for the second service network, and the first service network A failure determination means for determining whether or not a failure has occurred in one of the paths included in the redundant path provided as a resource, and when it is determined that a failure has occurred in the one path, The first switching control means for controlling to switch from the path to the other path included in the redundant path and the second path used in the second service network are the switching targets by the first switching control means. A second switching control unit that performs control to switch from the second path to a second path included in another redundant path among the redundant paths set by the path setting unit. .

  According to this configuration, the boundary node device sets a plurality of redundant paths based on the path setting request by the path setting means. Here, for example, a path setting request is received from the first service network on the higher priority (or higher reliability) side. The set redundant paths are candidates for one redundant path that is actually used as a resource, and are a plurality of communication paths that are communicably connected to other boundary node devices. Then, the boundary node device provides the first path and the second path as the resources for the first service network by the resource provision control means, and only the second path as the resources for the second service network. provide. Note that the redundant path to be provided is not necessarily shared by the two service networks.

  Then, the boundary node device determines, for example, that a failure has occurred in the first path among the provided redundant paths by the failure determination unit. For this reason, the boundary node device may determine that a failure has occurred depending on whether a notification indicating that a failure has been detected is received from another device. Further, a detection means for detecting a failure may be provided, and it may be determined that a failure has occurred when a failure is detected by the detection means. When the failure occurs, the boundary node device diverts the traffic from the first path where the failure has occurred to the second path, for example, by the first switching control unit. And when the 2nd path | route used as the detour is already used in the 2nd service network, the traffic of the said detour is detoured to the other set redundant path by a 2nd switching control means.

  The boundary node device according to claim 2 is a backbone having a plurality of boundary node devices accommodating the first service network and the second service network, and a path connecting the plurality of boundary node devices to each other. A path that is a boundary node device in a network and sets a plurality of redundant paths including a first path that can be used as a resource having a predetermined bandwidth and a second path that is a spare paired with the first path. A setting unit; a bundling unit that generates a link that logically bundles a second path included in each of the plurality of predetermined redundant paths set by the path setting unit; and One as a resource for the first service network, and a link generated by the bundle means is connected to the second service network. Resource providing control means for performing control provided as a work resource, failure determining means for determining whether a failure has occurred in one of the redundant paths provided as resources in the first service network, and And switching control means for performing control to switch from one path in which the defect has occurred to the other path included in the redundant path when it is determined that the defect has occurred in the one path. .

  According to such a configuration, the boundary node device generates, as a link, a path obtained by logically bundling a plurality of second paths by the bundling means, and provides it as a resource for the second service network. Therefore, the boundary node device can divert traffic to the second path that is not used as a detour among the bundled second paths by the switching control means when a failure occurs. The boundary node device provides the redundant path itself as a resource for the first service network by the resource provision control unit.

  The boundary node device according to claim 3 is a backbone having a plurality of boundary node devices accommodating the first service network and the second service network, and a path connecting the plurality of boundary node devices to each other. A path that is a boundary node device in a network and sets a plurality of redundant paths including a first path that can be used as a resource having a predetermined bandwidth and a second path that is a spare paired with the first path. A setting unit; a bundling unit that generates a plurality of paths, each of which is a logically bundled second path included in each of the plurality of predetermined redundant paths set by the path setting unit; and the set redundancy One of the paths is provided as a resource for the first service network and a plurality of links generated by the bundle means Whether or not a failure has occurred in one of the paths included in the redundant path provided as a resource to the first service network, and a resource provision control unit that performs control to provide one or more of these as resources for the second service network A failure determination means for determining whether or not a failure has occurred in one of the paths, and a control for switching from the one path in which the failure has occurred to the other path included in the redundant path. When the second path that is bundled and used by the switching control unit and the link provided to the second service network is a switching target by the first switching control unit, from the second path, Second switching control means for controlling to switch to another second path bundled in a link provided to the second service network. And wherein the door.

  According to such a configuration, the boundary node device generates a plurality of paths obtained by logically bundling a plurality of second paths as links by the bundle unit. That is, a plurality of bundled links are set (can be provided). Of these, one bundled link is used as a resource for the second service network. Then, when a failure occurs, the border node device causes the first switching control unit to, for example, detour the traffic of the first path in which the failure has occurred to the second path. Then, when the second path which is the detour is already used in the second service network, the second switching control unit causes the traffic of the detour to be bundled with another set of links. Detour to 2 passes. Here, the other second path may be bundled in a link in which the second path as a detour is bundled, or may be bundled in a link different from the link.

  Further, the boundary node device according to claim 4 requests the increase or decrease of the bandwidth of the redundant path provided to the first service network in the boundary node device according to any one of claims 1 to 3. Provided resource determining means for determining whether or not the second path included in the redundant path is provided as a resource based on a bandwidth change request indicating a message to be transmitted, and the bandwidth change request requests an increase in bandwidth Requested bandwidth discrimination means for discriminating whether or not the second path is not provided as a resource, and based on the bandwidth change request, the second bandwidth included in the provided redundant path is determined. First path bandwidth changing means for changing the bandwidth of one path, and when the bandwidth change request requests an increase in bandwidth when the bandwidth of the first path is changed Second path bandwidth changing means for changing the bandwidth of the second path that is a pair of the first path and maintaining the bandwidth of the second path when the bandwidth change request requests a reduction of the bandwidth It is preferable to further comprise.

  According to such a configuration, the boundary node device performs the change allowing the bandwidth change request when the redundant path provided as the resource is not shared by the two service networks by the first path bandwidth changing unit. For example, a bandwidth change request is received from the first service network that has a higher priority. Then, the boundary node device changes the band used as the resource by the second service network by the second path band changing unit without necessarily interlocking with the band change request. That is, if the bandwidth change request is a bandwidth decrease, the bandwidth is maintained as it is without being linked. If the bandwidth change request is a bandwidth increase, it may be linked regardless of shared / non-shared.

  In order to solve the above-mentioned problem, the redundant path setting method according to claim 5 includes a plurality of boundary node devices accommodating a first service network and a second service network, and a plurality of boundary node devices mutually. A redundant path setting method for a border node device in a backbone network having a path to be connected, wherein the first path can be used as a resource having a predetermined bandwidth and a spare paired with the first path. A path setting step for setting a plurality of redundant paths including the second path, and providing one of the set redundant paths as a resource for the first service network, and among the set redundant paths A resource providing control step for performing control to provide a second path included in one of the resources as a resource for the second service network. A failure determination step for determining whether or not a failure has occurred in one of the paths included in the redundant path provided as a resource to the first service network, and when it is determined that a failure has occurred in the one of the paths , A first switching control step for performing control to switch from one path in which the defect has occurred to the other path included in the redundant path, and a second path used in the second service network includes the first path Second switching control step for performing control to switch from the second path to the second path included in another redundant path among the redundant paths set in the path setting step when the switching target is the switching target in the switching control step. It is characterized by including.

  According to such a procedure, the boundary node device sets a plurality of redundant paths based on the path setting request in the path setting step, and the resource providing control step sets the first path and the first path as the resources for the first service network. Two paths are provided, and only the second path is provided as a resource for the second service network. Then, the boundary node device determines that a failure has occurred in any of the provided redundant paths in the failure determination step, and in the first switching control step, for example, changes from the first path in which the failure has occurred to the second path. Divert traffic to the path. When the second path that has become the detour has already been used in the second service network, the traffic of the detour is detoured to another set redundant path in the second switching control step.

  The redundant path setting method according to claim 6 includes a plurality of boundary node devices accommodating the first service network and the second service network, and paths connecting the plurality of boundary node devices to each other. A redundant path setting method for a border node device in a backbone network, including a first path that can be used as a resource having a predetermined bandwidth and a second path that is a spare paired with the first path A path setting step for setting a plurality of paths; a step for generating a path that is a logical bundling of the second paths respectively included in the predetermined plurality of redundant paths set in the path setting step; and the set Providing one of the redundant paths as a resource for the first service network and generating the link; A resource provision control step for performing control to provide the provided link as a resource for the second service network, and whether one path included in the redundant path provided as a resource to the first service network has failed. And a switching control step for performing control to switch from one path in which the fault has occurred to the other path included in the redundant path when it is determined that a fault has occurred in the one path. It is characterized by including.

  According to such a procedure, the boundary node device uses the bundled link generated in the step of generating a path that logically bundles the second path as a link as a resource for the second service network in the resource providing control step. provide. Therefore, when a failure occurs, the boundary node device can divert the traffic to the second path that is not used as a detour among the bundled second paths in the switching control step. In the resource provision control step, the resource for the first service network provides the redundant path itself.

  The redundant path setting method according to claim 7 includes a plurality of boundary node devices accommodating the first service network and the second service network, and paths connecting the plurality of boundary node devices to each other. A redundant path setting method for a border node device in a backbone network, including a first path that can be used as a resource having a predetermined bandwidth and a second path that is a spare paired with the first path A path setting step for setting a plurality of paths, and a step of generating a plurality of paths as a link in which a predetermined number of second paths respectively included in the predetermined plurality of redundant paths set in the path setting step are bundled One of the set redundant paths is provided as a resource for the first service network, and a plurality of the links are generated. A resource providing control step for performing control to provide one or more of the plurality of links generated in the step as a resource for the second service network, and a redundant path provided as a resource to the first service network. A failure determination step for determining whether or not a failure has occurred in one of the included paths, and when it is determined that a failure has occurred in the one of the paths, the redundant path is included in the redundant path. A first switching control step for performing control to switch to the other path, and a second path that is bundled and used in a link provided to the second service network is to be switched by the first switching control step. The second path to another link bundled to the link provided to the second service network. Characterized in that it comprises a second switching control step of performing control to switch the two-pass.

  According to such a procedure, the boundary node device generates one or more of the bundled links generated in the step of creating a plurality of paths obtained by logically bundling the second paths as the links in the resource provision control step. And provided as a resource for the second service network. In the resource provision control step, the resource for the first service network provides the redundant path itself. Then, when a failure occurs, the boundary node device diverts the traffic of the first path in which the failure has occurred to the second path, for example, in the first switching control step. Then, when the second path which is the detour is already used in the second service network, in the second switching control step, the traffic of the detour is bundled with another second link bundled with the set link. Detour to 2 passes. The other second path may be bundled in a link in which the second path as a detour is bundled, or may be bundled in a link different from the link.

  Further, the redundant path setting method according to claim 8 is the redundant path setting method according to any one of claims 5 to 7, wherein the bandwidth of the redundant path provided to the first service network is increased or decreased. Based on a bandwidth change request indicating a message requesting a resource, a provided resource determining step for determining whether or not the second path included in the redundant path is provided as a resource, and the bandwidth change request requests an increase in bandwidth. A requested bandwidth determining step for determining whether or not the second path is not provided as a resource, and included in the provided redundant path based on the bandwidth change request when it is determined that the second path is not provided as a resource. A first path bandwidth changing step for changing the bandwidth of the first path, and when the bandwidth of the first path is changed, the bandwidth change request requests an increase in bandwidth. If the bandwidth of the second path that is a pair of the first path is changed and the bandwidth change request requests a reduction of the bandwidth, the bandwidth of the second path is maintained. Preferably, the method further includes a two-pass band changing step.

  According to such a procedure, the boundary node device, when the redundant path provided as a resource is not shared by the two service networks in the first path bandwidth changing step, the first service on the higher priority side Changes that allow a bandwidth change request from the network. Then, the border node device maintains the bandwidth as it is without being linked if the bandwidth change request is a bandwidth reduction in the second path bandwidth change step.

  A redundant path setting program according to claim 9 causes a computer to execute the redundant path setting method according to any one of claims 5 to 8. By being configured in this way, a computer in which this program is installed can realize each function based on this program.

  According to the present invention, traffic communication of a plurality of service networks can be continued even when a failure occurs or a bandwidth change request is made.

  Hereinafter, the best mode (hereinafter referred to as “embodiment”) for carrying out the boundary node device and redundant path setting method of the present invention with reference to the drawings is divided into first to third embodiments. This will be described in detail.

(First embodiment)
FIG. 1 is a configuration diagram of a communication system including a boundary node device according to an embodiment of the present invention.
The communication system shown in FIG. 1 includes a backbone network 1, a first service network 2a, and a second service network 2b.

The backbone network 1 includes a plurality of boundary node devices 100 (100a, 100b) and redundant paths 10a, 10b that connect the boundary node devices 100 to each other.
The border node device 100 accommodates the first service network 2a and the second service network 2b. The boundary node device 100 is present at the boundary between the backbone network 1 and the service networks 2a and 2b, and establishes a redundant path with another boundary node device 100. For example, when the redundant path 10a is established, the boundary node device 100a is the starting point of the redundant path 10a, and the boundary node device 100b is the terminal point of the redundant path 10a.

  The redundant path 10a includes a first path (also referred to as an operation side path) 10a-1 that can be used as a resource having a predetermined bandwidth, and a second path that is a spare paired with the first path 10a-1 ( 10a-2) (also referred to as backup path). Similarly, the redundant path 10b includes a first path 10b-1 and a second path 10b-2. The first path and the second path forming each redundant path 10a, 10b are, for example, an optical fiber or a full-duplex cable that separates and transmits an upstream optical signal and a downstream optical signal, respectively. is there.

The first path 10a-1 of the redundant path 10a is relayed to the relay node device 200a (200), and the second path 10a-2 of the redundant path 10a is relayed to the relay node device 200b (200). Yes. Further, the first path 10b-1 of the redundant path 10b is relayed to the relay node devices 200c and 200d (200). Further, the second path 10b-2 of the redundant path 10b is relayed to the relay node devices 200e and 200f (200).
The relay node device 200 includes an optical cross connect, a router, a switch, and the like.

The first service network 2a and the second service network 2b include a plurality of boundary node devices 100 and a plurality of node devices 300.
The node device 300 is the same device as the relay node device 200 except that the arrangement with the boundary node device 100 is different, and includes, for example, an optical cross-connect, a router, and a switch.

  The first service network 2a has the authority to establish (set) the redundant path 10a, the authority to release the redundant path, and the authority to use the resources of the redundant path. On the other hand, the second service network 2b does not have the authority described above.

  The first service network 2a is a more reliable network than the second service network 2b. Therefore, it may be called a highly reliable service network. The redundant path 10a established in the backbone network 1 is provided as a logical link 20a-1 in the first service network 2a. Here, the link 20a-1 is configured by all of the redundant paths 10a, that is, both the first path 10a-1 and the second path 10a-2. Therefore, in the first service network 2a, for example, when a predetermined traffic uses the first path 10a-1 included in the link 20a-1, a failure occurs in the first path 10a-1. In order to bypass this traffic, the second path 10a-2 can be used. Thereby, traffic communication (information passes without delay) is continued. The redundant path 10b can be provided as a logical link 20b-1 in the first service network 2a. When two links are provided at a time, the number of links used by the first service network 2a at one time is one.

  The second service network 2b is a network with lower reliability than the first service network 2a. Therefore, it may be called a low reliability service network. The second path 10a-2 included in the redundant path 10a established in the backbone network 1 is provided as a logical link 20a-2 in the second service network 2b. The second path 10b-2 included in the redundant path 10b can be provided as a logical link 20b-2 in the second service network 2b. When two links are provided at a time, the number of links used by the second service network 2b at one time is one.

  In FIG. 1, the boundary node device 100 is shared by the first service network 2 a, the second service network 2 b, and the backbone network 1, as indicated by the broken line shown in FIG. 1. Among these, in the backbone network 1, the boundary node device 100 is illustrated in a plan view in order to emphasize the physical aspect, and in the first service network 2a and the second service network 2b, the logical aspect is emphasized. In order to do so, it is illustrated in three dimensions.

FIG. 2 is an explanatory diagram of the communication system shown in FIG. 1, wherein (a) shows the first service network and (b) shows the second service network. 2A and 2B are drawings when FIG. 1 is expressed separately.
As shown in FIG. 2A, the redundant path 10a of the backbone network 1 is provided as a link 20a-1 to the first service network 2a. As shown in FIG. 1, the link 20a-1 includes a first path 10a-1 and a second path 10a-2. Further, as shown in FIG. 2B, the redundant path 10a is provided as a link 20a-2 to the second service network 2b. This link 20a-2 includes only the second path 10a-2.

  Similarly, the redundant path 10b of the backbone network 1 is provided as a link 20b-1 to the first service network 2a as shown in FIG. The link 20b-1 includes a first path 10b-1 and a second path 10b-2. Further, as shown in FIG. 2B, this redundant path 10b is provided as a link 20b-2 to the second service network 2b. This link 20b-2 includes only the second path 10b-2.

  In the following description, the first service network 2a and the second service network 2b will be described with reference mainly to the explanatory diagram of the integrated format shown in FIG.

[Configuration of boundary node device]
FIG. 3 is a functional block diagram illustrating an example of the boundary node device according to the first embodiment of the present invention. As shown in FIG. 3, the boundary node device 100 includes an input / output unit 110, a control unit 130, and a storage unit 150.
The input / output means 110 is constituted by, for example, a communication interface or the like, and inputs predetermined commands and information and outputs predetermined information. Here, the input / output unit 110 includes a path setting request receiving unit 111, a band change request receiving unit 113, a provided resource communication unit 115, and a failure notification receiving unit 117.

The path setting request receiving unit 111 receives a path setting request indicating a message requesting to set a redundant path from the first service network 2a, and outputs the path setting request to the path setting unit 131 described later.
The bandwidth change request receiving unit 113 receives a bandwidth change request indicating a message requesting increase / decrease of the bandwidth of the redundant path provided to the first service network 2a from the first service network 2a, and provides provided resource determination unit 137 described later. Is output.

The provided resource communication unit 115 notifies the first service network 2a and the second service network 2b of information related to redundant paths provided as resources based on the control of the control unit 130.
The failure notification receiving unit 117 receives a failure notification indicating a message notifying that there is a failure in the first path provided as a resource from the backbone network 1 and outputs the failure notification to the failure determination unit 134 described later. .

  The control means 130 is composed of, for example, a CPU (Central Processing Unit) or the like, and controls the input / output means 110 and the storage means 150 and sets the redundant paths 10a and 10b. As shown in FIG. Path setting means 131, setting path management means 132, synchronization control means 133, failure determination means 134, first switching control means 135, second switching control means 136, provided resource determination means 137, requested bandwidth A determination unit 138, a resource provision control unit 139, and a provision resource management unit 140 are provided.

The path setting unit 131 sets a plurality of redundant paths based on the path setting request, and outputs information on the set redundant paths to the resource provision control unit 139 and the set path management unit 132.
The setting path management unit 132 stores the set redundant path in the setting path DB 151 and reads information stored in the setting path DB 151.

  The synchronization control unit 133 performs control for synchronizing the boundary node devices 100. The synchronization obtained by the synchronization control unit 133 is output to the first switching control unit 135 and the second switching control unit 136 via the failure determination unit 134. Thereby, a path | pass can be switched between the boundary node apparatuses 100 at the same timing.

  The failure determination unit 134 determines whether or not a failure has occurred in a path included in the redundant path provided as a resource to the first service network 2a based on the failure notification. The failure determination unit 134 determines the determination result as the first switching control unit 135 and Output to the second switching control means 136. Specifically, when a failure notification is received, the failure determination unit 134 provides, as a resource, the second path included in the redundant path provided to the first service network 2a based on the currently provided resource. In the case where it has been provided, the first switching control means 135 and the second switching control means 136 are instructed to cope with the control, and in the case where it has not been provided, Instruct the control to deal only with the 1 switching control means 135.

When the failure determination unit 134 determines that a failure has occurred in one path, the first switching control unit 135 performs control to switch from one path in which a failure has occurred to the other path included in the redundant path ( Hereinafter, the first switching process is performed.
The second switching control unit 136 is set by the path setting unit 131 from the second path when the second path used in the second service network 2b is a switching target by the first switching control unit 135. Control for switching to a second path included in another redundant path of the redundant paths (hereinafter referred to as second switching process) is performed.

When the bandwidth change request is received, the provided resource determining unit 137 is provided with the second path included in the redundant path provided to the first service network 2a as a resource based on the currently provided resource. And the determination result is output to the resource provision control unit 139 and the requested bandwidth determination unit 138.
The requested bandwidth discriminating unit 138 discriminates whether or not the bandwidth change request is a request to increase the bandwidth, and outputs the discrimination result to the resource provision control unit 139.

  The resource provision control unit 139 provides one of the set redundant paths (set paths) as a resource for the first service network 2a, and sets the second path included in one of the set paths as the first path. Control is provided as a resource for the two-service network 2b. A publicly known method can be used for providing the resource. The resource provision control unit 139 includes a first path band changing unit 141 and a second path band changing unit 142.

The first path band changing unit 141, when the requested band determining unit 138 determines that the second path is not provided as a resource, the first path band changing unit 141 includes the first path included in the provided redundant path based on the band change request. Control to change the bandwidth of the path is performed.
Further, the first path bandwidth changing unit 141 is configured to request that the bandwidth change request further increase the bandwidth when the requested bandwidth determining unit 138 determines that the second path is provided as a resource. In this case, the bandwidth of the first path is changed, and if the bandwidth change request requests a reduction of the bandwidth, the bandwidth of the first path is maintained.

The second path bandwidth changing unit 142, when the first path bandwidth changing unit 141 changes the bandwidth of the first path, if the bandwidth change request requests an increase in the bandwidth, When the bandwidth of the second path as a pair is changed, and when the bandwidth change request requests reduction of the bandwidth, control is performed to maintain the bandwidth of the second path.
Further, the second path bandwidth changing unit 142 further requests that the bandwidth change request be increased when the requested bandwidth determining unit 138 determines that the second path is provided as a resource. In such a case, the bandwidth of the second path that is a pair of the first path is changed, and when the bandwidth change request requests a reduction of the bandwidth, the bandwidth of the second path is maintained.

  The provided resource management unit 140 stores the provided resource in the first resource DB 153 or the second resource DB 155 and reads information stored in both the DBs 153 and 155. The provided resource management unit 140 performs an update including deletion of information that is no longer necessary in the first resource DB 153 or the second resource DB 155.

  The storage unit 150 includes, for example, a RAM (Random Access Memory) and an HDD (Hard Disk Drive). In this case, the RAM is used for arithmetic processing by the control unit 130 and stores information acquired via the input / output unit 110. The HDD stores various databases, predetermined programs, and processing of the control unit 130. Stores results etc.

In addition, the storage unit 150 includes a setting path DB 151, a first resource DB 153, and a second resource DB 155.
The setting path DB 151 is a database for the backbone network 1 and stores an identifier indicating the boundary node device 100 in the backbone network 1 and information on redundant paths set in the boundary node device 100 in the backbone network 1.

The first resource DB 153 is a database for the first service network 2a, and includes an identifier indicating the boundary node device 100 in the first service network 2a and link information held by the boundary node device 100 in the first service network 2a. Stored.
The second resource DB 155 is a database for the second service network 2b, and includes an identifier indicating the boundary node device 100 in the second service network 2b and link information held by the boundary node device 100 in the second service network 2b. Stored.

  Each of the units 131 to 142 included in the control unit 130 is realized by the CPU developing and executing a predetermined program stored in the HDD of the storage unit 150 on the RAM.

[Operation of boundary node device]
The operation of the border node apparatus 100 shown in FIG. 3 will be described with reference to FIG. 4 (see FIG. 3 as appropriate). FIG. 4 is a flowchart showing a path setting method by the boundary node device shown in FIG.

  Here, the processing of the boundary node device 100 (100a) serving as the starting point of the redundant path will be described. First, the boundary node device 100 synchronizes in advance between the two boundary node devices 100 by the synchronization control means 133. Then, the boundary node device 100 determines the received message acquired via the input / output unit 110 (step S1).

Specifically, when the path setting request receiving unit 111 receives a path setting request from the first service network 2a, the boundary node device 100 executes the processes of steps S2 to S5.
In addition, when the bandwidth change request receiving unit 113 receives a bandwidth change request from the first service network 2a, the boundary node device 100 executes the processes of steps S6 to S10 as necessary. The boundary node device 100 also executes the processes of step S4 and step S5 as necessary.
In addition, when the failure notification receiving unit 117 receives a failure notification from the backbone network 1, the boundary node device 100 executes the processes of steps S11 to S13 as necessary. The boundary node device 100 also executes the processes of step S4 and step S5 as necessary.

<Path setting request>
When a path setting request is received in step S1, the boundary node device 100 sets a plurality of redundant paths based on the path setting request by the path setting unit 131 (step S2: path setting step). Then, the boundary node apparatus 100 stores the set redundant path (set path) in the set path DB 151 by the set path management unit 132 (step S3). The boundary node device 100 provides the resource to the first service network 2a or the second service network 2b that requested the path setting by the resource provision control unit 139 (step S4: resource provision control step). Specifically, when a path setting is received from the first service network 2a, one of the setting paths is provided as a resource for the first service network 2a. In this case, resources are provided between the two boundary node devices 100a and 100b at the same timing. When a path setting is received from the second service network 2b, the second path included in one of the setting paths is provided as a resource for the second service network 2b. Note that resources are provided at the same timing. The boundary node device 100 stores the provided resource in the first resource DB 153 or the second resource DB 155 by the provided resource management unit 140 (step S5).

<Bandwidth change request>
When the bandwidth change request is received in step S1, the boundary node device 100 provides the second path included in the redundant path provided to the first service network 2a as a resource by the provided resource determination unit 137. Whether the second path has been provided or not (step S6: provided resource determination step).

  When the second path is not provided (step S6: No), the boundary node device 100 uses the requested bandwidth determination unit 138 to indicate whether the content of the bandwidth change request indicates bandwidth increase (requests to increase bandwidth). (Step S7: request bandwidth determination step). When the content of the bandwidth change request indicates bandwidth reduction (step S7: No), the boundary node device 100 changes the bandwidth of the first path by the first path bandwidth changing means 141 (step S8), and the second The band of the second path is maintained by the path band changing unit 142. On the other hand, when the content of the bandwidth change request indicates an increase in bandwidth (step S7: Yes), the boundary node device 100 changes the bandwidth of the first path by the first path bandwidth changing means 141 and the second path. The bandwidth changing unit 142 changes the bandwidth of the second path (step S9).

  On the other hand, when the second path has been provided (step S6: Yes), the boundary node device 100 determines whether or not the content of the bandwidth change request indicates an increase in bandwidth by the requested bandwidth determination unit 138 ( Step S10: Requested bandwidth determination step). When the content of the bandwidth change request indicates an increase in bandwidth (step S10: Yes), the boundary node device 100 proceeds to the above-described step S9, and when the content indicates a decrease in bandwidth (step S10: No), ends the processing. To do.

  Following step S8 or step S9 (both the first path bandwidth changing step and the second path bandwidth changing step), the boundary node device 100 proceeds to step S4. In this case, the bandwidth of the provided resource is changed at the same timing between the two boundary node devices 100a and 100b. Further, in step S <b> 5, the boundary node device 100 updates the information stored in the first resource DB 153 and / or the second resource DB 155 by the provided resource management unit 140.

<Failure notification>
When the failure notification is received in step S1, the border node apparatus 100 is included in the redundant path provided to the first service network 2a by the failure determination unit 134 based on the currently provided resource. It is determined whether or not two paths are used by the second service network 2b. That is, it is determined whether or not the second path is provided as a resource to the second service network 2b (whether the switching target has been provided) (step S11: failure determination step). When the switching target has been provided (step S11: Yes), the boundary node device 100 executes the first switching process by the first switching control unit 135 and performs the second switching by the second switching control unit 136. Processing is executed (step S12: first switching control step and second switching control step). Here, the first switching process is executed first, and then the second switching process is executed. On the other hand, when the switching target is not provided (step S11: No), the boundary node device 100 executes only the first switching process by the first switching control unit 135 (step S13: first switching control step). ).

  Following step S12 or step S13, the boundary node device 100 proceeds to step S4. In this case, the provided resource path is switched between the two boundary node devices 100a and 100b at the same timing. Further, in step S <b> 5, the boundary node device 100 updates the information stored in the first resource DB 153 and / or the second resource DB 155 by the provided resource management unit 140.

  The boundary node device 100 can also be realized by executing a redundant path setting program that causes a general computer to execute the above steps. These programs can be distributed via a communication line, or can be written on a recording medium such as a CD-ROM for distribution.

[Specific example of path setting]
FIG. 5 is an explanatory diagram showing a specific example of path setting by the boundary node device shown in FIG.
Here, the first path (10a-1, 10b-1) and the second path (10a-2, 10b-2) forming the redundant paths 10a, 10b are, for example, GMPLS (Generalized Multi-Protocol Label Switching). LSP (Label Switched Paths) in the network is assumed. As for GMPLS, for example, K. Kompella et al, “LSP Hierarchy with Generalized MPLS TE, RFC4206 Label Switched Paths (LSP) Hierarchy with Generalized Multi-Protocol Label Switching (GMPLS) Traffic Engineering (TE)” <URL: http </www.ietf.org/rfc/rfc4206.txt>.

The first service network 2a requests setting of a redundant path. Specifically, a predetermined node device 300 belonging to the first service network 2a transmits a path setting request to the boundary node device 100a based on a user operation. Here, it is assumed that redundant paths 10a and 10b exist in the backbone network 1. That is, only one redundant path is currently required as a resource, but there is another redundant path as an extra resource. In this case, the boundary node device 100a sets the redundant paths 10a and 10b for the first service network 2a, and provides the redundant path 10a as the link 20a-1. Thereby, the first service network 2a can use the first path of the link 20a-1 (redundant path 10a) as a resource.
In the following, the case of failure occurrence / bandwidth change request will be described by dividing into two patterns.

<First pattern>
Here, when the second service network 2b requests the setting of a redundant path, the boundary node device 100a sets the redundant paths 10a and 10b for the second service network 2b, and links 20a-2 and 20b-2. As offered. Thereby, the second service network 2b can use the second path 10a-2 included in the redundant path 10a provided as a resource to the first service network 2a as the link 20a-2 (resource). The first pattern assumes such a case.

  In this state, when a failure occurs in the first path 10a-1 of the redundant path 10a, the boundary node device 100a first sends traffic to the first service network 2a and the second path 10a-2 of the redundant path 10a. To detour. Next, the boundary node device 100a diverts the traffic to the link 20b-2 (second path 10b-2 of the redundant path 10b) to the second service network 2b. Thereby, even when a failure occurs, the first service network 2a and the second service network 2b can continue to communicate traffic.

When the boundary node device 100a receives a bandwidth change request from the first service network 2a in the state of the first pattern, it operates as follows.
When the change content of the bandwidth change request indicates an increase in bandwidth, the bandwidth of the first path 10a-1 of the link 20a-1 (redundant path 10a) is increased and the link 20a-2 (redundant path 10a) is increased. The bandwidth of the second path 10a-2) is increased. Therefore, the first service network 2a and the second service network 2b can continue traffic communication.
On the other hand, when the change content of the bandwidth change request indicates a decrease in the bandwidth, the bandwidth of the first path 10a-1 of the link 20a-1 (redundant path 10a) is also the bandwidth of the link 20a-2 (second of the redundant path 10a). The bandwidth of the path 10a-2) is also maintained as it is. That is, since there is no change, the first service network 2a and the second service network 2b can continue traffic communication.

<Second pattern>
When the second service network 2b requests the setting of a redundant path, the boundary node device 100a sets the redundant paths 10a and 10b to the second service network 2b and provides them as links 20a-2 and 20b-2. . As a result, the second service network 2b uses, as the link 20b-2 (resource), the second path 10b-2 included in the redundant path 10b different from that provided as a resource to the first service network 2a. be able to. The second pattern assumes such a case.

  In this state, when a failure occurs in the first path 10a-1 of the redundant path 10a, the boundary node device 100a first sends traffic to the first service network 2a and the second path 10a-2 of the redundant path 10a. To detour. The second path 10a-2 that has become a detour is not used for the second service network 2b. Thereby, even when a failure occurs, the first service network 2a and the second service network 2b can continue to communicate traffic.

  When the boundary node device 100a receives a bandwidth change request from the first service network 2a in the state of the second pattern, the change contents are reflected on the first path 10a-1 of the redundant path 10a. The content of the change may be an increase or decrease in bandwidth. On the other hand, for the second path 10a-2 of the redundant path 10a, when the received bandwidth change request indicates “increase”, the boundary node device 100a interlocks with the second path 10a-2. Increase bandwidth. Thereby, the first service network 2a and the second service network 2b can continue to communicate traffic even when the bandwidth is changed.

  However, when the received bandwidth change request indicates “decrease”, the boundary node device 100a maintains the bandwidth of the second path 10a-2 as it is independently. Thereby, the bandwidth of the second path 10a-2 can be ensured to a predetermined size. Therefore, in the future, even when the second path 10a-2 is provided as a link 20b-2 (resource) to a low-reliability network such as the second service network 2b, it is possible to avoid adverse effects on traffic communication. It becomes.

  In the present embodiment, it has been described that the traffic of the second service network 2b is diverted when a failure occurs. However, there is a surplus bandwidth sufficient for a link (resource) provided and used for the second service network 2b. If it exists, this surplus bandwidth may be utilized instead of detouring. In this case, it is preset for the boundary node device 100 as follows. In other words, this setting is, for example, “in the packet layer or TDM (Time Division Multiplexing) layer, a link (resource) provided to the second service network 2b at the time of failure is connected to the first service network 2a. The traffic of the second service network 2b is transferred using the surplus bandwidth remaining on the link even after the traffic is detoured. "

  According to the first embodiment, when there are surplus resources such as a plurality of redundant paths in the backbone network 1, even if a failure occurs or there is a bandwidth change request, the first service network 2 a Since the second service network 2b can use the resources of the backbone network 1, traffic communication in the backbone network 1 can be continued.

(Second Embodiment)
[Configuration of boundary node device]
FIG. 6 is a functional block diagram illustrating an example of a boundary node device according to the second embodiment of the present invention.
As shown in FIG. 6, the boundary node device 100A includes a bundle unit 143 in the control unit 130, and has one switching control unit (first switching control unit 135), and the function of the failure determination unit 134A is different. Except for this point, the configuration is the same as that of the boundary node device 100 illustrated in FIG. 3.

The bundling unit 143 generates a path obtained by logically bundling the second paths respectively included in the plurality of redundant paths set by the path setting unit 131 as one link. When there are three or more redundant paths, they may be bundled in multiple times.
When a failure notification is received, the failure determination unit 134A determines that a failure has occurred in a path included in the redundant path provided as a resource to the first service network 2a, and copes with the first switching control unit 135. Instruct the control to do.
Note that the path setting unit 131 stores information on logically bundled (bundled) links as information stored in the setting path DB 151 via the setting path management unit 132, instead of information on the set redundant paths. Alternatively, it may be output to the setting path management means 132.

[Operation of boundary node device]
6 will be described with reference to FIG. 7 (refer to FIG. 6 as appropriate). FIG. 7 is a flowchart showing a path setting method by the boundary node device shown in FIG. First, the boundary node device 100A determines the received message acquired via the input / output unit 110 (step S21).

<Path setting request>
When the path setting request is received in step S21, the boundary node device 100A sets a plurality of redundant paths by the path setting unit 131 (step S22: path setting step). Then, the boundary node device 100A generates a link in which a plurality of set redundant paths (set paths) are bundled into one (step S23). Specifically, one link is generated by logically bundling (bundling) each second path included in all setting paths. The boundary node device 100 stores the bundled links in the setting path DB 151 by the setting path management unit 132 (step S24), and provides resources by the resource provision control unit 139. Specifically, when a path setting is received from the first service network 2a, one of the setting paths is provided as a resource for the first service network 2a. The setting path management unit 132 may store the setting path in the setting path DB 151 instead of the link.

  When the path setting is received from the second service network 2b, the bundled link is provided as a resource for the second service network 2b (step S25: resource provision control step). The boundary node device 100 stores the provided resource in the first resource DB 153 or the second resource DB 155 by the provided resource management unit 140 (step S26).

<Bandwidth change request>
Each process of step S27 to step S31 executed by the boundary node device 100A is the same as each process of step S6 to step S10 shown in the flowchart of FIG.

<Failure notification>
When a failure notification is received in step S21, the boundary node device 100A determines that a failure has occurred in a path included in the redundant path provided as a resource to the first service network 2a by the failure determination unit 134 ( Failure determination step). Then, the boundary node device 100A executes the first switching process by the first switching control unit 135 (step S32: switching control step). Subsequently, the boundary node device 100A proceeds to step S25, switches the provided resource path, and updates the information stored in the first resource DB 153 by the provided resource management unit 140 in step S26.

  Here, in the resource (bundled link) provided to the second service network 2b, the bandwidth of the second path included in the failed redundant path is used as a detour for the first service network 2a. If this is the case, resources for this band will be reduced. In this case, the boundary node device 100A also updates the information stored in the second resource DB 155 by the provided resource management unit 140 in step S26.

[Specific example of path setting]
FIG. 8 is an explanatory diagram showing a specific example of path setting by the boundary node device shown in FIG. In FIG. 8, since the resources other than the resources provided to the second service network 2b are the same as those in the explanatory diagram of FIG.

  Two boundary node devices 100a and 100b (hereinafter simply referred to as boundary node device 100A), which are the boundary node devices 100A of the second embodiment, set redundant paths 10a and 10b to the first service network 2a. Provided as links 20a-1 and 20b-1. The boundary node device 100A bundles the second path 10a-2 and the second path 10b-2 to generate the link 21-2 and provides it as a resource for the second service network 2b.

<Third pattern>
Here, it is assumed that the first service network 2a uses the link 20a-1 and the second service network 2b uses the link 21-2. In this case, the redundant path 10a is shared by the first service network 2a and the second service network 2b. Specifically, in this case, the first service network 2a uses the first path 10a-1, and the second service network 2b uses the second path 10a-2 or the second path 10b-2.

  In this state, when a failure occurs in the first path 10a-1 included in the redundant path 10a, the boundary node device 100A allocates resources used for the first service network 2a from the first path 10a-1. Switch to the second path 10a-2. As a result, the traffic of the first service network 2a flows through the second path 10a-2 of the link 20a-1. The second path 10a-2 corresponds to a surplus resource other than the portion of the link 21-2 where the traffic of the second service network 2b flows. Therefore, when a failure occurs, the traffic of the second service network 2b still flows through the link 20-2 (however, the second path 10b-2 portion).

  According to the second embodiment, a single bundle of resources is provided to the second service network 2b by bundling the second paths of a plurality of redundant paths set in the backbone network 1 into one. it can. By bundling in this way, the bandwidth of the resource for the second service network 2b is expanded, and a large volume of traffic can be transferred in the second service network 2b.

(Third embodiment)
[Configuration of boundary node device]
FIG. 9 is a functional block diagram illustrating an example of a boundary node device according to the third embodiment of the present invention.
As shown in FIG. 9, the border node device 100B has the same configuration as the border node device 100 shown in FIG. 3 except that the control unit 130 includes a bundle unit 143A. The description will be omitted.

  The bundle unit 143A is configured to generate a plurality of paths that are logically bundled with a predetermined number of second paths respectively included in the plurality of redundant paths set by the path setting unit 131 as links. Note that the path setting means 131 sets four or more redundant paths. The bundle unit 143A preferably generates two links that logically bundle two second paths included in the set four redundant paths.

[Operation of boundary node device]
The operation of the boundary node device 100B shown in FIG. 9 will be described with reference to FIG. 10 (see FIG. 9 as appropriate). FIG. 10 is a flowchart showing a path setting method by the boundary node device shown in FIG. Of the processes shown in the flowchart of FIG. 10, descriptions of processes similar to those shown in the flowchart of FIG. 4 are omitted as appropriate. First, the boundary node device 100B determines the received message acquired via the input / output unit 110 (step S41).

<Path setting request>
When the path setting request is received in step S41, the boundary node device 100B sets four or more redundant paths by the path setting unit 131 (step S42: path setting step). Then, the boundary node device 100B generates a plurality of links in which the setting paths are bundled (Step S43). Specifically, a plurality of links in which the second paths included in the setting path are logically bundled (bundled) are generated.

  Subsequently, the boundary node device 100B stores the bundled link in the setting path DB 151 by the setting path management unit 132 (step S44), and provides the resource by the resource provision control unit 139. Specifically, when a path setting is received from the first service network 2a, one of the setting paths is provided as a resource for the first service network 2a. The setting path management unit 132 may store the setting path in the setting path DB 151 instead of the link.

  When the path setting is received from the second service network 2b, the bundled links are provided as resources for the second service network 2b (step S45: resource provision control step). Then, the boundary node device 100B stores the provided resource in the first resource DB 153 or the second resource DB 155 by the provided resource management unit 140 (step S46).

<Bandwidth change request>
Since each process of step S47-step S51 which the boundary node apparatus 100B performs is the same as each process of step S6-step S10 shown in the flowchart of FIG. 4, description is abbreviate | omitted.

<Failure notification>
Each process of step S52 to step S54 executed by the boundary node device 100B is the same as each process of step S11 to step S13 shown in the flowchart of FIG.

[Specific example of path setting]
FIG. 11 is an explanatory diagram showing a specific example of path setting by the boundary node device shown in FIG.
In the backbone network 1B illustrated in FIG. 11, four redundant paths 10a to 100b between two boundary node devices 100a and 100b (hereinafter simply referred to as boundary node device 100B), which are the boundary node devices 100B of the third embodiment. 10d can be set. The redundant path 10a includes the first path 10a-1 and the second path 10a-2, and the redundant path 10b includes the first path 10b-1 and the second path 10b-2. It is configured to include. The redundant path 10c includes a first path 10c-1 and a second path 10c-2, and the redundant path 10d includes the first path 10d-1 and the second path 10d-2. It is configured to include. Further, the redundant paths 10a to 10d are relayed to the relay node device 200 although illustration is omitted.

  The boundary node device 100B provides the set redundant paths 10a, 10b, 10c, and 10d as links 20a-1, 20b-1, 20c-1, and 20d-1 to the first service network 2a. In addition, for example, the boundary node device 100B bundles the second path 10a-2 and the second path 10b-2 to generate the link 21a-2, and also creates the second path 10c-2 and the second path 10d-2. Are linked to generate the link 21b-2. The boundary node device 100B provides the link 21a-2 and the link 21b-2 as resources for the second service network 2b.

<4th pattern>
Here, it is assumed that the first service network 2a uses the link 20a-1 and the second service network 2b uses the link 21a-2. In this case, the redundant path 10a is shared by the first service network 2a and the second service network 2b. Specifically, in this case, the first service network 2a uses the first path 10a-1, and the second service network 2b uses the second path 10a-2 or the second path 10b-2.

  In this state, when a failure occurs in the first path 10a-1 included in the redundant path 10a, the boundary node device 100B allocates resources used for the first service network 2a from the first path 10a-1. Switch to the second path 10a-2. As a result, the traffic of the first service network 2a flows through the second path 10a-2 of the link 20a-1. That is, the traffic of the first service network 2a flows through the second path 10a-2 portion of the link 21a-2.

  Then, the boundary node device 100B switches the provided resource for the second service network 2b from the link 21a-2 to the link 21b-2. That is, the redundant path 10a shared between the first service network 2a and the second service network 2b is released. As a result, the traffic of the second service network 2b flows through the link 21b-2.

  If the bandwidth required for the traffic of the second service network 2b is less than half of the transferable bandwidth of the bundled link 21a-2, excess resources in the link 21a-2 are allocated when a failure occurs. It may be used to forward traffic of the second service network 2b. In this case, only one link is provided for the second service network 2b.

  According to the third embodiment, a large number of links in which the second paths of a plurality of redundant paths set in the backbone network 1B are bundled (bundled) are generated in the second service network 2b. Capacity traffic can be transferred. Also, since a plurality of links bundled with the second path are provided, the traffic of the second service network 2b can be diverted from the second path in use to the second path of another link.

  As mentioned above, although each embodiment of this invention was described, this invention is not limited to these, It can implement in the range which does not change the meaning. For example, the boundary node device 100 has been described as storing the provided resource in the first resource DB 153 (or the second resource DB 155) after providing the resource, but the present invention is not limited to this. Conversely, the resources stored in the first resource DB 153 (or the second resource DB 155) may be provided to the service networks 2a and 2b.

  In each embodiment, the number of boundary node devices 100 (100A, 100B) in the backbone network 1 (1B) has been described as two. However, the present invention is not limited to this. Similarly, the number of relay node devices 200 and node devices is arbitrary. Further, the number of service networks may be three or more. In this case, the priority order may be given in advance, or the priority order may be given by the boundary node device.

It is a block diagram of the communication system containing the boundary node apparatus which concerns on embodiment of this invention. FIG. 2 is an explanatory diagram of the communication system shown in FIG. 1, where (a) shows a first service network and (b) shows a second service network. It is a functional block diagram which shows an example of the boundary node apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the path | pass setting method by the boundary node apparatus shown in FIG. It is explanatory drawing which shows the specific example of the path | pass setting by the boundary node apparatus shown in FIG. It is a functional block diagram which shows an example of the boundary node apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the path | pass setting method by the boundary node apparatus shown in FIG. It is explanatory drawing which shows the specific example of the path | pass setting by the boundary node apparatus shown in FIG. It is a functional block diagram which shows an example of the boundary node apparatus which concerns on the 3rd Embodiment of this invention. 10 is a flowchart showing a path setting method by the boundary node device shown in FIG. 9. It is explanatory drawing which shows the specific example of the path | pass setting by the boundary node apparatus shown in FIG.

Explanation of symbols

1 (1B) Backbone network 2a First service network 2b Second service network 10a to 10d Redundant path 100 (100a, 100b) Border node device 100A, 100B Border node device 200 (200a to 200c) Relay node device 300 Node device 11 15 Partial path 110 Input / output means 111 Path setting request receiving means 113 Band change request receiving means 115 Provided resource communication means 117 Failure notification receiving means 130 Control means 131 Path setting means 132 Set path management means 133 Synchronization control means 134 (134A) Failure Discriminating means 135 First switching control means 136 Second switching control means 137 Provided resource discriminating means 138 Request bandwidth discriminating means 139 Resource provision controlling means 140 Providing resource managing means 141 First Path bandwidth change unit 142 second pass band changing means 143 (143A) Bundle means 150 storing unit 151 sets a path DB
153 First resource DB
155 Second resource DB

Claims (9)

A boundary node device in a backbone network having a plurality of boundary node devices accommodating a first service network and a second service network, and a path connecting the plurality of boundary node devices to each other,
Path setting means for setting a plurality of redundant paths including a first path that can be used as a resource having a predetermined bandwidth and a second path that is a spare paired with the first path;
One of the set redundant paths is provided as a resource for the first service network, and a second path included in one of the set redundant paths is set for the second service network. Resource provision control means for performing control provided as a resource;
Failure determination means for determining whether a failure has occurred in one of the paths included in the redundant path provided as a resource to the first service network;
First switching control means for performing control to switch from one path in which the defect has occurred to the other path included in the redundant path when it is determined that a defect has occurred in the one path;
When the second path used in the second service network is a switching target by the first switching control unit, another redundant path set by the path setting unit is selected from the second path. Second switching control means for performing control to switch to the second path included in the redundant path;
A boundary node device comprising: A boundary node device in a backbone network having a plurality of boundary node devices accommodating a first service network and a second service network, and a path connecting the plurality of boundary node devices to each other,
Path setting means for setting a plurality of redundant paths including a first path that can be used as a resource having a predetermined bandwidth and a second path that is a spare paired with the first path;
Bundling means for generating, as a link, a path obtained by logically bundling the second paths respectively included in the predetermined plurality of redundant paths set by the path setting means;
Providing resources for performing control to provide one of the set redundant paths as a resource for the first service network and to provide a link generated by the bundle means as a resource for the second service network Control means;
Failure determination means for determining whether a failure has occurred in one of the paths included in the redundant path provided as a resource to the first service network;
A switching control means for performing control to switch from one path in which the defect has occurred to the other path included in the redundant path when it is determined that a defect has occurred in the one path;
A boundary node device comprising: A boundary node device in a backbone network having a plurality of boundary node devices accommodating a first service network and a second service network, and a path connecting the plurality of boundary node devices to each other,
Path setting means for setting a plurality of redundant paths including a first path that can be used as a resource having a predetermined bandwidth and a second path that is a spare paired with the first path;
Bundling means for generating a plurality of paths as a link in which a predetermined number of second paths respectively included in the plurality of predetermined redundant paths set by the path setting means are logically bundled;
One of the set redundant paths is provided as a resource for the first service network, and at least one of a plurality of links generated by the bundle means is a resource for the second service network Resource providing control means for performing control provided as:
Failure determination means for determining whether a failure has occurred in one of the paths included in the redundant path provided as a resource to the first service network;
First switching control means for performing control to switch from one path in which the defect has occurred to the other path included in the redundant path when it is determined that a defect has occurred in the one path;
When the second path bundled and used in the link provided to the second service network is a switching target by the first switching control means, the second service network is switched from the second path. A second switching control means for performing control to switch to another second path bundled in the link provided to
A boundary node device comprising: Providing to determine whether or not the second path included in the redundant path is provided as a resource based on a bandwidth change request indicating a message requesting increase / decrease of the bandwidth of the redundant path provided to the first service network Resource discrimination means;
Requested bandwidth determining means for determining whether the bandwidth change request is for requesting an increase in bandwidth; and
First path bandwidth changing means for changing the bandwidth of the first path included in the provided redundant path based on the bandwidth change request when it is determined that the second path is not provided as a resource; ,
When the bandwidth of the first path is changed, if the bandwidth change request requests an increase in bandwidth, the bandwidth of the second path that is a pair of the first path is changed, and the bandwidth A second path bandwidth changing means for maintaining the bandwidth of the second path when the change request is a request to reduce the bandwidth;
The boundary node device according to any one of claims 1 to 3, further comprising: A redundant path setting method for a boundary node device in a backbone network, comprising: a plurality of boundary node devices that accommodate a first service network and a second service network; and a path that interconnects the plurality of boundary node devices. ,
A path setting step for setting a plurality of redundant paths including a first path that can be used as a resource having a predetermined bandwidth and a second path that is a spare paired with the first path;
One of the set redundant paths is provided as a resource for the first service network, and a second path included in one of the set redundant paths is set for the second service network. A resource provision control step for performing control provided as a resource;
A failure determination step of determining whether or not a failure has occurred in one of the paths included in the redundant path provided as a resource to the first service network;
A first switching control step for performing control to switch from one path in which the defect has occurred to the other path included in the redundant path when it is determined that a defect has occurred in the one path;
When the second path used in the second service network is a switching target in the first switching control step, another redundant path set in the path setting step is selected from the second path. A second switching control step for performing control to switch to the second path included in the redundant path;
A redundant path setting method comprising: A redundant path setting method for a boundary node device in a backbone network, comprising: a plurality of boundary node devices that accommodate a first service network and a second service network; and a path that interconnects the plurality of boundary node devices. ,
A path setting step for setting a plurality of redundant paths including a first path that can be used as a resource having a predetermined bandwidth and a second path that is a spare paired with the first path;
Generating, as a link, a path obtained by logically bundling a second path included in each of a plurality of predetermined redundant paths set in the path setting step;
Control is provided for providing one of the set redundant paths as a resource for the first service network and providing the link generated in the step of generating the link as a resource for the second service network. A resource provision control step to perform;
A failure determination step of determining whether or not a failure has occurred in one of the paths included in the redundant path provided as a resource to the first service network;
A switching control step for performing control to switch from one path in which the defect has occurred to the other path included in the redundant path when it is determined that a defect has occurred in the one path;
A redundant path setting method comprising: A redundant path setting method for a boundary node device in a backbone network, comprising: a plurality of boundary node devices that accommodate a first service network and a second service network; and a path that interconnects the plurality of boundary node devices. ,
A path setting step for setting a plurality of redundant paths including a first path that can be used as a resource having a predetermined bandwidth and a second path that is a spare paired with the first path;
Generating a plurality of paths as a link obtained by logically bundling a predetermined number of second paths respectively included in the plurality of predetermined redundant paths set in the path setting step;
One of the set redundant paths is provided as a resource for the first service network, and at least one of a plurality of links generated in the step of generating a plurality of the links is used as the second service. A resource provision control step for performing control to be provided as a network resource;
A failure determination step of determining whether or not a failure has occurred in one of the paths included in the redundant path provided as a resource to the first service network;
A first switching control step for performing control to switch from one path in which the defect has occurred to the other path included in the redundant path when it is determined that a defect has occurred in the one path;
When the second path that is bundled and used in the link provided to the second service network is the switching target in the first switching control step, the second service network starts from the second path. A second switching control step for performing control to switch to another second path bundled in the link provided to
A redundant path setting method comprising: Providing to determine whether or not the second path included in the redundant path is provided as a resource based on a bandwidth change request indicating a message requesting increase / decrease of the bandwidth of the redundant path provided to the first service network A resource determination step;
A requested bandwidth determination step for determining whether or not the bandwidth change request requests an increase in bandwidth; and
A first path bandwidth changing step of changing the bandwidth of the first path included in the provided redundant path based on the bandwidth change request when it is determined that the second path is not provided as a resource; ,
When the bandwidth of the first path is changed, if the bandwidth change request requests an increase in bandwidth, the bandwidth of the second path that is a pair of the first path is changed, and the bandwidth A second path bandwidth changing step for maintaining the bandwidth of the second path when the change request is a request to reduce the bandwidth;
The redundant path setting method according to any one of claims 5 to 7, further comprising:   A redundant path setting program for causing a computer to execute the redundant path setting method according to any one of claims 5 to 8.

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