JP4806379B2 - Bandwidth allocation method, boundary node device, communication system, and bandwidth allocation program - Google Patents

Description

  The present invention relates to a bandwidth allocation technique using a boundary node device that exists at the boundary between a core network and a service network, and more particularly to a bandwidth allocation technique using a boundary node device that exists in a core network that accommodates a plurality of service networks.

Conventionally, a communication system using a network (multilayer network: MLSN) in which node devices belonging to different layers exist has been proposed. In this multi-layer network, a predetermined upper layer node device is relayed to a plurality of lower layer node devices, and a path is established in order to provide a link with an upper layer node device in the same hierarchy. There is known a path setting method for providing a link to the same instance as the other instance (for example, Non-Patent Document 1). Here, the predetermined upper layer node device is, for example, a boundary node device existing at the boundary between the core network and the service network, and the lower layer node device is a relay node device that relays between the boundary node devices. . An instance is a processing unit that retains a protocol and stores necessary information. In a single node device, an instance is provided for each network such as a core network and a service network, and processing such as routing is independent of each other. And do it.
K. Kompella et a1, Label Switched Paths (LSP) Hierarchy with Generalized Multi-Protocol Label Switching (GMPLS), Traffic Engineering (TE), RFC4206

  However, according to the current regulations disclosed in Non-Patent Document 1, in order to provide a link between predetermined upper layer node devices, the same instance (for example, of the core network) in which path establishment is performed in both node devices, respectively. The established path can only be provided as a link to the instance. For this reason, for example, a boundary node device existing in a core network that accommodates a plurality of service networks uses a network bandwidth (hereinafter simply referred to as a bandwidth) as a link resource (network resource) by a single path to a plurality of service networks. Cannot be provided at the same time. That is, resources cannot be provided by performing bandwidth allocation for a plurality of service networks with respect to a single path bandwidth established between border node devices.

  Accordingly, an object of the present invention is to provide a bandwidth allocation technique that can solve the above-described problems and can simultaneously provide a plurality of service networks with paths established between node devices.

In order to solve the above-described problem, the bandwidth allocation method according to claim 1 includes a plurality of different service networks each including a plurality of node devices, and a core network including a plurality of relay node devices and accommodating the plurality of service networks. And an instance for a core network, which is a node device higher than the relay node device and present at a boundary between the core network and the plurality of service networks of the multi-layer network formed by a bandwidth allocation method of the boundary node apparatus for allocating a predetermined bandwidth as part resource of the light path in the core network and an instance to the service network, the boundary node apparatus, by the core network for instance, Core net Core network management step and the established optical path containing the light path and the path establishment step of establishing, in the established optical paths giving identifiers to stored means between the other boundary node apparatus in over click A bandwidth allocation step of assigning a predetermined bandwidth as a partial resource of the established optical path , and assigning an identifier to the service network to which the partial resource is provided, and the service network of the provision destination When providing a part of the resources of the established optical path to the service network that is the provision destination by the service instance , one of the allocated optical paths in the service network identified by the assigned identifier. grant provide state information indicating that the band parts resources are capable of providing state, stored in the storage means And service network management step that, the advertising step of advertising the information resource of the established optical paths are provided to the service network to which the providable status information is given to the plurality of service networks, including It is characterized by performing.

  According to such a procedure, the boundary node device assigns an identifier to a path established in the core network, manages the path in the core network, and assigns an identifier to the service network that intends to provide the established path as a resource. Allocate bandwidth as resources. Here, the predetermined bandwidth allocated in the bandwidth allocation step does not merely indicate a fixed value (bandwidth), but may be a bandwidth that changes each time, for example. When it fluctuates, the initial value of the bandwidth need not be fixed in advance. Further, the bandwidth may be a value within a predetermined fluctuation range. The variation range can be determined arbitrarily, but may be determined based on, for example, an actually used interface. Then, the boundary node device gives provisionable state information when providing the resource in the service network that intends to provide the resource, and the resource information provided to the service network is transmitted to the plurality of service networks. advertise. As a result, paths established between node devices can be simultaneously provided to a plurality of service networks.

The bandwidth allocation method according to claim 2 is the bandwidth allocation method according to claim 1, wherein the boundary node device indicates an interface used as an end point of the optical path established in the path establishment step. The step of associating the information, the identifier assigned to the established optical path, and the identifier assigned in the bandwidth allocation step with a forwarding table in which a packet forwarding destination is set in advance is executed.

  According to such a procedure, the boundary node device associates a path established in the core network together with the assigned service network with a forwarding table, thereby allowing a single core network device to handle a packet flowing through a plurality of service networks. A path can be provided as a link for packet forwarding.

The bandwidth allocation method according to claim 3 is the bandwidth allocation method according to claim 1 or 2, wherein the bandwidth allocation step includes a bandwidth predetermined as a partial resource of the established optical path. As described above, the bandwidth set in advance or the same bandwidth as the link resource connected to the service network to which the border node device is provided is allocated.

  According to such a procedure, the border node apparatus allocates the same band as the link resource connected to the service network or the bandwidth set in advance, so that the resource band allocated to the service network is fixed. Can do. Therefore, the boundary node device can allocate a band with a relatively low processing load. Here, the link resource of the boundary node device is, for example, the transmission band of the interface to the service network of the boundary node device.

The bandwidth allocation method according to claim 4 is the bandwidth allocation method according to claim 2 or 3, wherein the core network management step is used as an end point of the optical path established in the path establishment step. The storage unit associates physical interface information indicating an interface, an identifier assigned to the established optical path, an identifier assigned in the bandwidth assignment step, and a bandwidth assigned as a partial resource of the established optical path. It is characterized by storing in.

  According to such a procedure, the boundary node device manages, in the core network, the physical interface information of the actual path, the arbitrary identifier assigned to the path, the arbitrary identifier assigned to the service network, and the allocated bandwidth. To do. Therefore, operation and management in the core network can be performed flexibly. For example, when a failure occurs in the core network, it is possible to promptly notify the failure.

Further, the bandwidth allocation method according to claim 5 is the bandwidth allocation method according to any one of claims 2 to 4, wherein the service network management step is performed at the providing destination in the bandwidth allocation step. An identifier assigned to a certain service network is associated with a bandwidth allocated as a part of the resource of the established optical path, and is fixedly held in a database for the service network.

  According to such a procedure, the boundary node device performs operation / management in the service network separately from the operation / management in the core network, so that, for example, even if a failure occurs in the core network, it does not depend on it. The service network can be operated and managed stably.

The bandwidth allocation method according to claim 6 is the bandwidth allocation method according to claim 1 or 2, wherein the boundary node device measures a traffic amount of the service network that is the provision destination. And the bandwidth allocating step sets the measured traffic amount among the path bandwidths that can be provided by the established optical path as a predetermined bandwidth as a part of the resources of the established optical path. It is characterized by allocating the corresponding band in a variable manner.

  According to such a procedure, the boundary node apparatus measures the traffic amount of the service network that is the provision destination, and assigns a bandwidth according to the measured traffic amount. Therefore, it is possible to flexibly change the bandwidth of the provided resource. it can. For example, when the traffic volume of one of the two service networks decreases and the traffic volume of the other increases, the resource bandwidth can be increased or decreased correspondingly and provided to both. Thereby, the utilization efficiency of resources can be improved.

The bandwidth allocation method according to claim 7 is the bandwidth allocation method according to claim 6, wherein the core network management step indicates a physical interface used as an end point of the optical path established in the path establishment step. and interface information, the identifier assigned to the established optical path, and bandwidth of the established optical path, the identifier is applied in the band allocation step, allocated as part resource of the established optical paths A bandwidth and attribute information of partial resources of the established optical path are associated with each other and stored in the storage unit.

  According to such a procedure, the boundary node device, in the core network, the physical interface information of the actual path, the arbitrary identifier given to the path, the bandwidth of the established path, and the arbitrary identifier given to the service network Since the allocated bandwidth and the resource attribute information are managed in association with each other, operation and management in the core network can be flexibly performed. Here, the resource attribute information is, for example, information indicating the cost of the link through which the packet flows.

The bandwidth allocation method according to claim 8 is the bandwidth allocation method according to claim 6 or 7, wherein the service network management step assigns to the service network which is the provision destination in the bandwidth allocation step. The identifier is associated with the band allocated variably as a part of the resource of the established optical path, and is stored in the service network database in an updatable manner.

  According to such a procedure, the boundary node device performs operation / management in the service network separately from the operation / management in the core network, and updates and holds it as necessary to reflect fluctuations in the bandwidth allocated to the service network. To do. Therefore, operation and management in the service network can be stably performed following the change in traffic volume.

The bandwidth allocation method according to claim 9 is the bandwidth allocation method according to any one of claims 6 to 8, wherein the advertisement step is a traffic measured for the service network that is the provision destination. When the allocated bandwidth varies according to the amount, the identifier of the service network that is the provision destination and the varied bandwidth are advertised as resource information of the established optical path .

  According to such a procedure, when the allocated bandwidth varies according to the traffic volume, the boundary node device considers the traffic variation, adjusts the allocated bandwidth for the plurality of service networks, and allocates the bandwidth allocated to each service network. Is advertised each time, the allocated bandwidth can be advertised to a plurality of service networks in accordance with a change in the traffic volume of any service network. Therefore, resources can be flexibly allocated to a plurality of service networks in accordance with a change in the traffic volume of any service network.

The boundary node apparatus according to claim 10 includes a plurality of service networks having different comprising a plurality of node devices, respectively, and a core network accommodating a plurality of service networks includes a plurality of relay node devices, in the form A boundary node device that exists at a boundary between the core network and the plurality of service networks in a multi-layer network and provides a part of an optical path resource in the core network to the service network, the relay node device Higher-level node device, comprising a core network instance and a plurality of service network instances, and the core network instance establishes an optical path with other boundary node devices in the core network Path establishment means; And the core network management means for storing the serial established optical path grant identifiers to store means to the service network is a providing destination of some resources of the established optical paths, grant identifiers, the establishment Band allocating means for allocating a predetermined band as a partial resource of the optical path, and each instance for the service network is a partial resource of the established optical path in the service network that is the provision destination Providing service state information indicating that it is in a state in which it is possible to provide the bandwidth of a part of the resources of the assigned optical path in the service network identified by the assigned identifier , and service network management means for storing in the storage means, against the service network to which the providing state information is given Characterized in that it comprises respectively an advertisement means for advertising the information resource of the established optical paths are provided to the plurality of service networks Te.

  According to such a configuration, the boundary node device manages the path in the core network by assigning an identifier to the path established in the core network, and assigns the identifier to the service network that intends to provide the established path as a resource. Allocate bandwidth as resources. Then, the boundary node device gives provisionable state information to the service network to provide the resource when providing the resource, and advertises information on the resource provided to the service network to a plurality of service networks. To do. As a result, paths established between node devices can be simultaneously provided to a plurality of service networks.

The communication system according to claim 11 is formed by a plurality of different service networks each including a plurality of node devices, and a core network including a plurality of relay node devices and accommodating the plurality of service networks . A communication system having a caller node device and a callee node device respectively present at a boundary between the core network and the plurality of service networks of a multilayer network , wherein the caller node device and the callee node device One of the devices is a node device higher than the relay node device, and includes a core network instance and a plurality of service network instances, and the core network instance is connected to the other device. path establishment to establish the light path to A stage, and the core network management means for storing the grant to the storage means an identifier to the established optical path, the service network is a providing destination of some resources of the established optical paths, grant identifiers Band allocation means for allocating a predetermined band as a partial resource of the established optical path, and as the service network instance, the established optical path to the service network that is the provision destination Providable state information indicating that the bandwidth of the partial resource of the allocated optical path can be provided in the service network identified by the assigned identifier when providing the partial resource. imparting to the service network management means for storing in the memory means, the service network of the providing state information is given Characterized in that it comprises an advertisement means for advertising the information resource of the established optical paths are provided for the workpiece to the plurality of service networks, respectively.

  According to such a configuration, in the communication system, the path is managed in the core network by assigning an identifier to the path established between the caller node device and the callee node device in the core network, and the established path is used as a resource. An identifier is assigned to a service network to be provided and a bandwidth as a resource is allocated. Then, the caller node device and the callee node device give provisionable state information when providing the resource to the service network to provide the resource, and information on the resource provided to the service network Advertise to multiple service networks. As a result, the paths established between the caller node device and the callee node device can be simultaneously provided to a plurality of service networks.

A bandwidth allocation program according to claim 12 is a program for causing a computer to execute the bandwidth allocation method according to any one of claims 1 to 9. By being configured in this way, a computer in which this program is installed can realize each function based on this program.

  ADVANTAGE OF THE INVENTION According to this invention, the path established between the node apparatuses of a core network can be simultaneously provided to several service networks. Therefore, the utilization efficiency of path resources can be increased.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out a border node device and a bandwidth allocation method according to the present invention (hereinafter referred to as “embodiment”) will be described in detail below by dividing it into a first embodiment and a second embodiment with reference to the drawings. To do.

(First embodiment)
FIG. 1 is an explanatory diagram schematically showing an outline of a boundary node device according to an embodiment of the present invention. The communication system 1 includes a caller node device (boundary node device) 10 and a callee node device (boundary node device) 20 that respectively exist at the boundary between the core network 2 and the plurality of service networks 3 and 4. Yes. The caller node device 10 establishes a path 5 with the callee node device 20 via the relay node device 30 and provides partial resources of the established path 5 in the core network 2 to the service networks 3 and 4. To do. The path 5 is an optical path configured by an optical fiber, for example, GMPLS-LSP (Generalized Multi-Protocol Label Switching-Label Switched Path), and is configured to be usable as a resource having a predetermined band.

  The core network 2 and the plurality of service networks 3 and 4 form a multilayer network (MLSN). The core network 2 accommodates a plurality of service networks 3 and 4. The service network 3 is configured to include a plurality of node devices 40 and 50. The service network 4 is configured to include a plurality of node devices 60 and 70. The service network 3 can be configured by a network having higher reliability than the service network 4, for example.

  The caller node device 10 includes, for example, a NIC (Network Interface) for communicating with a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and an HDD (Hard Disk Drive). Card) and the like, and includes an optical cross connect (OXC), a router, a switch, and the like. The originator node device 10 is configured to establish a path in accordance with RSVP-TE (Resource reSerVation Protocol-Traffic Engineering) such as RFC3473.

  The caller node device 10 includes a core network instance 11 as a processing unit that holds a protocol for the core network 2 and stores necessary information, a service network instance 12 as a processing unit for the service network 3, a service A service network instance 13 is provided as a processing unit for the network 4. Each instance will be described later. The caller node device 10 includes physical interfaces 14, 15, and 16. The physical interface 14 is an interface for connecting to the core network 2. The physical interface 15 is an interface for connecting to the service network 3. The physical interface 16 is an interface for connecting to the service network 4.

  The callee node device 20 is the same device as the caller node device 10 and includes a core network instance 21 and a plurality of service network instances 22 and 23. In addition, the called party node device 20 includes physical interfaces 24, 25, and 26. The physical interface 24 is an interface for connecting to the core network 2. The physical interfaces 25 and 26 are interfaces for connecting to the service networks 3 and 4, respectively.

  The caller node device 10 has path request information for the callee node device 20. For example, the caller node device 10 has a path 5 having both ends of the physical interface 14 of the caller node device 10 and the physical interface 24 of the callee node device 20. Establish. In order to manage the established path 5, the caller node device 10 assigns the virtual interface ID “14a” as the identifier of the path 5 to the physical interface 14 that is the end point (left end in FIG. 1) of the path 5. . Similarly, the callee node device 20 also assigns the virtual interface ID “24a” as the identifier of the path 5 to the physical interface 24 that is the end point (right end in FIG. 1) of the path 5.

  The caller node device 10 provides the established path 5 to the service network 3 via the physical interface 15. The caller node device 10 assigns the logical interface ID “15a” as an identifier for the service network 3. The caller node device 10 includes the physical interface 14 used for establishing the path 5, the ID “14a” of the virtual interface serving as the end point of the established path 5, and the ID “15a” of the logical interface of the service network 3. Associate. Similarly, the callee node device 20 provides the established path 5 to the service network 3 via the physical interface 25. The receiver node device 20 assigns the logical interface ID “25a” as an identifier for the service network 3. The callee node device 20 includes the physical interface 24 used for establishing the path 5, the virtual interface ID “24a” serving as the end point of the established path 5, and the logical interface ID “25a” of the service network 3. Associate. Thereby, for the service network 3, the logical interface of the caller node device 10 (its ID is “15a”) and the logical interface of the callee node device 20 (its ID is “25a”) are used as endpoints. A TE (Traffic Engineering) advertisement is made so that a link exists.

  Similarly, the caller node device 10 provides the established path 5 to the service network 4 via the physical interface 16. The caller node device 10 assigns the logical interface ID “16a” as an identifier for the service network 4. The caller node device 10 includes the physical interface 14 used for establishing the path 5, the ID “14a” of the virtual interface serving as the end point of the established path 5, and the ID “16a” of the logical interface of the service network 4. Associate. Similarly, the callee node device 20 provides the established path 5 to the service network 4 via the physical interface 26. The receiver node device 20 assigns the logical interface ID “26a” as an identifier for the service network 4. The callee node device 20 includes the physical interface 24 used for establishing the path 5, the ID “24a” of the virtual interface serving as the end point of the established path 5, and the ID “26a” of the logical interface of the service network 4. Associate. As a result, the TE advertisement is made on the service network 4 so that there is a link having the logical interface “16a” of the caller node device 10 and the logical interface “26a” of the callee node device 20 as endpoints. The

  The relay node device 30 includes, for example, an optical cross connect, a router, and a switch. Although one relay node device 30 is illustrated in FIG. 1, a plurality of relay node devices 30 exist in the core network 2, and the number thereof is not particularly limited. The node devices 40, 50, 60, and 70 are the same devices as the relay node device 30 and include, for example, an optical cross-connect, a router, and a switch. The node devices 40, 50, 60, and 70 include physical interfaces 41, 51, 61, and 71, respectively. The physical interfaces 41 and 61 are connected to the physical interfaces 15 and 16 of the caller node device 10, respectively. The physical interfaces 51 and 71 are connected to the physical interfaces 25 and 26 of the callee node device 20, respectively.

[Configuration of sender node device]
FIG. 2 is a block diagram showing the configuration of the caller node device according to the first embodiment of the present invention. As shown in FIG. 2, the caller node device 10 includes a core network instance 11, service network instances 12 and 13, and transfer control means 17.

<Core network instance>
The core network instance 11 includes a path establishment unit 111, a core network management unit 112, a bandwidth allocation unit 113, and a storage unit 114.

  The path establishment unit 111 establishes the path 5 with the receiver node device 20 in the core network 2. The path establishment unit 111 establishes a path based on the path establishment request from the service networks 3 and 4, and outputs information about the established path to the core network management unit 112. The path establishment unit 111 transmits a path establishment request from the service networks 3 and 4 to the receiver node apparatus 20 via the relay node apparatus 30.

  The core network management unit 112 assigns an identifier to the path 5 established by the path establishment unit 111 and stores it in the storage unit 114. The core network management unit 112 reads information stored in the storage unit 114. In this embodiment, the path identifier is a virtual interface ID.

  The bandwidth allocation unit 113 assigns an identifier to a service network that is a provision destination of a partial resource of the established path 5 and allocates a predetermined bandwidth as a partial resource. In the present embodiment, the service network identifier is a logical interface ID. Further, in the present embodiment, the bandwidth allocating unit 113 includes a link resource (physical interface 15) connected to the service network 3 to which the caller node device 10 is provided as a bandwidth predetermined as a partial resource. Allocate the same bandwidth. For example, when the physical interface 15 that connects the caller node device 10 to the service network 3 is “1 Gbps”, a bandwidth of “1 Gbps” is allocated to the service network 3. In this case, it is assumed that the bandwidth of the path established in the core network 2 holds the same bandwidth as the physical interface 15 connected to the service network 3 or a larger bandwidth. In this case, the service network 3 may be assigned with a bandwidth such as “0.9 Gbps” which is substantially the same as “1 Gbps” but slightly smaller. Further, the bandwidth allocating unit 113 may be configured to allocate a bandwidth set in advance without being limited to the same bandwidth as the link resource (physical interface 15).

  The storage unit 114 is configured by, for example, a general memory, HDD, or the like, and stores a database for the core network 2. The database for the core network 2 includes, for example, interface information existing in the core network 2, path information established by the path establishment unit 111, an identifier for managing a path (physical interface information indicating an interface used as a path endpoint), The service network information as the established path providing destination, the identifier assigned to the service network by the bandwidth allocating unit 113, and the bandwidth allocated as a partial resource are stored in association with each other. The database for the core network 2 is stored in the storage unit 114 by the core network management unit 112.

  The core network management unit 112 also includes physical interface information indicating an interface used as an end point of the path established by the path establishment unit 111, an identifier assigned to the established path, and an identifier assigned by the bandwidth allocation unit 113. Are associated with a forwarding table in which packet forwarding destinations are set in advance.

  The path establishment unit 111, the core network management unit 112, and the bandwidth allocation unit 113 are realized by the CPU developing and executing a predetermined program stored in the HDD or the like of the storage unit in the RAM. is there.

<Service network instance>
As shown in FIG. 2, the service network instance 12 includes storage means 121, service network management means 122, and advertisement means 123.
The storage means 121 is composed of, for example, a general memory, HDD, or the like, and stores a database for the service network 3. The database for the service network 3 is an identifier given to the service network 3 as interface information existing in the service network 3 or partial resource information of a path established in the core network 2 and provided to the service network 3. (Logical interface ID) and allocated bandwidth information are retained. The database for the service network 3 is stored in the storage unit 121 by the service network management unit 122.

  The service network management unit 122 stores the identifier (logical interface ID) assigned to the service network 3 that is the provision destination by the band allocation unit 113 and the band allocated as a part of the resource in the storage unit 121. A fixed database is stored in the service network database. In this embodiment, the service network management unit 122 provides the service network 3 identified by the identifier assigned by the bandwidth allocation unit 113 when providing a part of the resources of the path 5 to the service network 3 that is the provision destination. Then, provisionable state information indicating that it is in a state in which it is possible to provide the bandwidth of the partial resource allocated by the bandwidth allocation means 113 is given. Here, the provisionable state information is not particularly limited as long as it distinguishes between a state that can be provided (allocated state) and a state that is not (unassigned state). For example, a state that can be provided may be indicated by “1”, and a state that is not available may be indicated by “0”.

  The advertising means 123 advertises information on resources provided to the service network 3 to which the provisionable state information is given to the plurality of service networks 3 and 4. In the present embodiment, the advertising means 123 advertises the identifier of the service network (logical interface ID) and the allocated bandwidth as TE information.

  The service network management means 122 and the advertising means 123 described above are realized by the CPU developing and executing a predetermined program stored in the HDD or the like of the storage means on the RAM.

  Since the service network instance 13 is the same as the service network instance 12 except that the service network instance 13 is an instance for the service network 4, the description thereof is omitted. The number of service network instances is an example, and may be three or more.

<Transfer control means>
The transfer control unit 17 is built in, for example, an interface card (line card), and includes a transfer processing unit 171 and a transfer table storage unit 172 as shown in FIG. The transfer processing means 171 converts the IP signal of the electrical signal into an IP packet of the optical signal for the established path, conversely, the process of converting the IP packet of the optical signal into the IP packet of the electrical signal, The route is switched and transferred by a packet switch (not shown). The transfer table storage unit 172 stores, for example, a transfer table that stores an identifier of a transfer source node device and its interface information, and an identifier of a transfer destination node device and its interface information.

As shown in FIG. 2, the relay node device 30 includes a path establishment unit 31 and a transfer control unit 32.
The path establishment means 31 receives a path establishment request from the caller node device 10 and establishes a path. When the path establishment means 31 receives a path establishment request from the originator node device 10 or another relay node device 30, the path establishment means 31 transmits the received path establishment request to the other relay node device 30 or the recipient node device 20.
The transfer control unit 32 performs processing for switching the path of the IP packet of the optical signal by using a packet switch (not shown) for the established path.

[Configuration of receiver node equipment]
FIG. 3 is a block diagram showing a configuration of the called party node device according to the first embodiment of the present invention. As shown in FIG. 3, the callee node device 20 includes a core network instance 21, service network instances 22 and 23, and transfer control means 27.

<Core network instance>
The core network instance 21 includes path establishment means 211, core network management means 212, bandwidth allocation means 213, and storage means 214. These path establishment means 211, core network management means 212, bandwidth allocation means 213 and storage means 214 are the same as the path establishment means 111, core network management means 112, bandwidth allocation means 113 and storage means 114 described with reference to FIG. Since it is the same, description is abbreviate | omitted.

<Service network instance>
As illustrated in FIG. 3, the service network instance 22 includes a storage unit 221, a service network management unit 222, and an advertisement unit 223.
These storage means 221, service network management means 222, and advertisement means 223 are the same as the storage means 121, service network management means 122, and advertisement means 123 described with reference to FIG. Further, the service network instance 23 is the same as the service network instance 22 except that the service network instance 23 is an instance for the service network 4, and a description thereof will be omitted.

<Transfer control means>
The transfer control unit 27 is built in, for example, an interface card (line card), and includes a transfer processing unit 271 and a transfer table storage unit 272 as shown in FIG.
These transfer processing means 271 and transfer table storage means 272 are the same as the transfer processing means 171 and transfer table storage means 172 described with reference to FIG.

[Operation of communication system]
The operation of the communication system 1 shown in FIG. 1 will be described with reference to FIG. 4 (refer to FIGS. 1 to 3 as appropriate). FIG. 4 is a flowchart showing a bandwidth allocation method according to the first embodiment of the present invention. The caller node device 10 sets a fixed band in advance for the service networks 3 and 4. Then, at the time of a request by the RSVP signal from the node device operated by the user who uses the service networks 3 and 4, the fixed setting band is allocated as follows.

  First, when the originator node device 10 receives a path establishment request from the service networks 3 and 4, the originator node device 10 establishes a path 5 by the path establishment unit 111 (step S101: path establishment step). That is, the caller node device 10 transmits a path establishment request to the relay node device 30. Then, the relay node device 30 establishes a path based on the received path establishment request by the path establishing means 31, and transmits the path establishment request to the adjacent relay node device 30 (step S201). The recipient node device 20 relayed by the path establishment request receives the path establishment request by the path establishment unit 211, confirms the path establishment request, and establishes the path 5 (step S301).

  Subsequently, the caller node device 10 generates a virtual interface as an identifier for the established path by the core network management unit 112 (step S102). That is, the core network management unit 112 assigns the virtual interface ID to the established path 5. Then, the caller node device 10 stores the ID of the virtual interface assigned to the path 5 in the database (DB) by the core network management unit 112, and holds the DB in the storage unit 114 (step S103). The caller node device 10 performs management in the core network 2 by the core network management unit 112 (step S104). At this time, path bandwidth information can also be managed as information held in the storage unit 114. The core network management unit 112 also includes physical interface information indicating an interface used as an end point of the path established by the path establishment unit 111, an identifier assigned to the established path, and an identifier assigned by the bandwidth allocation unit 113. Are associated with a forwarding table in which packet forwarding destinations are set in advance. These steps S102 to S104 correspond to core network management steps.

  Subsequently, the caller node apparatus 10 assigns an identifier (logical interface ID) to the service network by the band allocating unit 113 and allocates a predetermined band as a partial resource to the service network (step S105: band allocation). Step). At this time, the caller node device 10 allocates the same bandwidth as the bandwidth of the interface connected to the service network.

  Here, when performing processing for the service network 3, the caller node device 10 performs management in the service network by the service network management unit 122 (step S106: service network management step). That is, the caller node device 10 stores and manages information such as an identifier (logical interface ID) assigned to the service network and an allocated bandwidth in the storage unit 121. Then, when the caller node device 10 provides a part of the resources to the service network that is the provision destination by the service network management unit 122, the caller node device 10 provides the available state information in the service network identified by the assigned identifier. To do.

  A specific example of the database stored in the storage means 121 of the service network instance 12 is shown in FIG. The database shown in FIG. 5A includes items 501 to 503 respectively indicating “service network identifier”, “resource bandwidth”, and “state”. For example, “service network identifier” is “15a” indicating the ID of the logical interface, “resource bandwidth” is “1 Gbps”, and “state” is “down”. Here, “down” indicates a state before the core network instance 11 allocates resources to the service network instance 12. That is, in the state before the processing of S105 in the flowchart, in the service network instance 12, “state” is set to “down” on the database.

  In the process of S105, the core network instance 11 sets the identifier set in the service network instances 12 and 13 and the allocated bandwidth in association with the established optical path. FIG. 5B shows a specific example of the database stored in the storage unit 114 of the core network instance 11 when the core network instance 11 allocates resources to the service networks 3 and 4. The database shown in FIG. 5B has items 511 to 513 respectively indicating “optical path identifier”, “optical path bandwidth”, and “allocation contents”. Furthermore, “allocation contents” are subdivided into “service network identifier” and “bandwidth (BW)”. For example, in response to the case where the “optical path identifier” is “5” and the “optical path bandwidth” is “2.4 Gbps”, the “service network identifier” is set to “15a”. A resource whose width is “1 Gbps” is set. Corresponding to this optical path, a resource with a “bandwidth” of “1 Gbps” is set in a service network with a “service network identifier” of “16a”.

  Then, in the process of S105, a specific example of the database stored in the storage unit 121 of the service network instance 12 after the core network instance 11 assigns resources to the service network 3, for example, is shown in FIG. Shown in 5 (c). The database shown in FIG. 5C is the same as the database shown in FIG. 5A except that the data of the item 503 indicating “state” is changed to “up”. Here, “up” indicates that the core network instance 11 has assigned resources to the service network instance 12. That is, in the state after the process of S105 in the flowchart (S106), in the service network instance 12, the “state” is changed to “up” on the database. Here, “down” and “up” are provisionable state information, in which the provisionable state (allocated state) is “up”, and the other state (unallocated state) is “down”.

  Returning to FIG. 4, the description of the operation will be continued. The above describes the case where the process for the service network 3 is performed, but the same applies to the case where the process for the service network 4 is performed. Subsequent to step S106, the caller node device 10 uses the advertisement means 123 as the TE information that includes a plurality of service network identifiers and allocated bands as link information provided to the service network to which the available state information is given. The service networks 3 and 4 are advertised (step S107: advertisement step). In addition, the callee node device 20 performs the processes of steps S302 to S307. Since these processes are the same as the processes in steps S102 to S107 performed by the caller node device 10, description thereof will be omitted. Thus, the adjacency relationship is established when the caller node device 10 and the callee node device 20 advertise each other. For example, the caller node device 10 establishes an adjacent relationship with the node device 40 using the logical interface ID “15a” and establishes an adjacent relationship with the node device 60 using the logical interface ID “16a”. Similarly, for example, the callee node device 20 establishes an adjacency relationship with the node device 50 using the logical interface ID “25a” and establishes an adjacency relationship with the node device 70 using the logical interface ID “26a”. To do.

  As a result, the caller node device 10 and the callee node device 20 assign the paths established in the core network 2 to the plurality of service networks 3 and 4 and manage the assigned information in association with each other, and also associate them with the forwarding table. By holding this, traffic transfer of the service networks 3 and 4 becomes possible.

  The caller node device 10 and the callee node device 20 can also be realized by executing a bandwidth allocation 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.

  According to the first embodiment, the resource of the path 5 established between the caller node device 10 and the callee node device 20 can be provided to the plurality of service networks 3 and 4. In addition, each service network 3 and 4 can transfer a packet using the provided resources.

  In addition, according to the present embodiment, the communication system 1 is configured to allocate a fixed set bandwidth when a path establishment is requested by an RSVP signal from a node device operated by a user using the service networks 3 and 4. Therefore, resources can be used effectively compared to a configuration in which resources are provided when a path is established regardless of user requests. For example, establishing a path having a bandwidth of 10 Gpbs when there is no request is not an effective use of resources, but such a problem can be prevented.

  Furthermore, according to the present embodiment, since the virtual interface is generated, the state change of the optical path in the core network 2 (eg, occurrence of switching) can be concealed, and the influence on the routing of the service networks 3 and 4 can be minimized. . Therefore, even if a failure occurs in the path 5 in the core network 2 provided to the plurality of service networks 3 and 4 at the same time and the detour is made inside the core network 2, the routing in the service networks 3 and 4 is not affected. . Therefore, it is not necessary to notify the service networks 3 and 4 when detouring in the core network 2.

(Second Embodiment)
Since the overall configuration of the communication system of the second embodiment is the same as that shown in FIG.
[Configuration of sender node device]
FIG. 6 is a block diagram showing a configuration of a caller node device according to the second embodiment of the present invention. As shown in FIG. 6, the sender node device (boundary node device) 10A includes a core network instance 11A, service network instances 12A and 13A, and transfer control means 17. The core network instance 11A is the same as the core network instance 11 shown in FIG. 2 except that it includes a traffic management unit 115 and the band allocation unit 113A has a different function. Further, the service network instance 12A is the same as the service network instance 12 shown in FIG. 2 except that the service network instance 12A includes the traffic measurement means 124. Further, the service network instance 13A has the same relationship. Therefore, the description of the same configuration as that of the caller node device 10 illustrated in FIG.

  The traffic measurement means 124 of the service network instance 12A measures the traffic volume of the service network that is the provision destination. The traffic volume of the service network 3 can be, for example, the traffic volume that passes through the physical interface 15 connected to the service network 3 or the traffic volume that passes through the logical interface (its ID is “15a”). In the present embodiment, it is assumed that the traffic volume of the service network 3 is the traffic volume that passes through the logical interface. The traffic amount measured by the traffic measuring unit 124 is aggregated in the storage unit 121 by the service network management unit 122. In this embodiment, the service network management unit 122 includes the identifier (logical interface ID) assigned to the service network 3 that is the provision destination by the band allocation unit 113, and the band allocated as a part of the resource so as to be variable. Are stored in the database for the service network stored in the storage unit 121 in an updatable manner.

  The traffic management unit 115 of the core network instance 11A manages the traffic amount measured by the traffic measurement unit 124 of the service network instance 12A. In the present embodiment, the traffic management means 115 confirms the traffic amount stored in the storage means of each service network instance, and outputs the value of the maximum bandwidth within a predetermined control time to the bandwidth allocation means 113A.

  The bandwidth allocation unit 113A sets the traffic amount measured by the traffic management unit 115 out of the path bandwidths that can be provided by the established path as a bandwidth (virtual interface bandwidth) predetermined as a part of the established path resource. The corresponding bandwidth is allocated to the service network of the providing destination. In the present embodiment, the bandwidth allocation unit 113A uses the bandwidth value received from the traffic management unit 115 as the bandwidth value provided as a resource during the next control time.

  In the present embodiment, the core network management unit 112 updates the database stored in the storage unit 114 with the allocated band value (logical interface band) determined by the band allocation unit 113A. Further, the core network management unit 112 may assign Cost or the like as the attribute information of the logical interface. In the present embodiment, the core network management unit 112 also includes physical interface information indicating an interface used as an end point of the path established by the path establishment unit 111, and an identifier (virtual interface ID) assigned to the established path. And the bandwidth of the established path (virtual interface bandwidth), the identifier (logical interface ID) assigned by the bandwidth allocating means 113A, the bandwidth allocated as a part of the resource (logical interface bandwidth), and the portion The attribute information of the resource is associated and stored in the storage unit 114. Here, the resource attribute information is, for example, information (Cost) indicating the cost of the link through which the packet flows.

  In the present embodiment, the advertising means 123 of the service network instance 12A uses the identifier of the service network 3 as resource information when the allocated bandwidth varies according to the traffic volume measured for the service network 3. (Logical interface ID) and the changed bandwidth are advertised.

[Configuration of receiver node equipment]
FIG. 7 is a block diagram showing a configuration of a receiver node apparatus according to the second embodiment of the present invention. As shown in FIG. 7, the callee node device 20A includes a core network instance 21A, service network instances 22A and 23A, and transfer control means 27. The core network instance 21A is the same as the core network instance 11A described with reference to FIG. The service network instance 22A is the same as the service network instance 12A described with reference to FIG. Further, the service network instance 23A has the same relationship. Accordingly, the callee node device 20A has the same configuration as the caller node device 10A shown in FIG.

[Operation of communication system]
The operation of the communication system according to the second embodiment will be described with reference to FIG. 8 (refer to FIGS. 1 to 7 as appropriate). FIG. 8 is a flowchart showing a bandwidth allocation method according to the second embodiment of the present invention. The caller node device 10A fixes and sets a bandwidth to be initially assigned to the service networks 3 and 4 to a predetermined value in advance. Here, the value fixed in advance is set to the same band as the band of the interface connected to the service network by the caller node device 10A. Then, a variable bandwidth is allocated from the node device operated by the user who uses the service networks 3 and 4 as follows when requested by the RSVP signal.

  Each process of steps S111 to S117 executed by caller node device 10A, step S211 executed by relay node device 30 and steps S311 to S317 executed by callee node device 20A has been described with reference to FIG. Since the processing is the same as steps S101 to S107 executed by the caller node device 10, step S201 executed by the relay node device 30, and steps S301 to S307 executed by the callee node device 20, description thereof will be omitted.

  For example, in the case of performing processing for the service network 3, the caller node device 10A, following step S117, uses the traffic measurement means 124 of the service network instance 12A as the traffic amount of the service network 3 as a logical interface (its The amount of traffic passing through ID “15a”) is measured. Then, the caller node device 10A confirms the traffic amount stored in the storage unit 121 of the service network instance 12A by the traffic management unit 115 of the core network instance 11A, and within the predetermined control time, the traffic amount It is determined whether or not has changed (step S119). When the traffic volume does not change (step S119: No), the caller node device 10A ends the process. On the other hand, when the traffic amount has changed (step S119: Yes), the caller node device 10A returns to step S114, and the traffic management means 115 outputs the value of the maximum bandwidth within the control time to the bandwidth allocation means 113A. Accordingly, the caller node device 10A changes the band allocated to the service network 3 by the band allocation unit 113A in step S115.

  A specific example of the database stored in the storage unit 121 of the service network instance 12A is shown in FIG. The database shown in FIG. 9A includes items 901 to 903 indicating “service network identifier”, “resource bandwidth”, and “state”, respectively. For example, “service network identifier” is “15a” indicating the ID of the logical interface, “resource bandwidth” is set to “variable”, and “state” is “down”. Here, the initial value of “variable” of “resource bandwidth” is the same bandwidth (for example, 1 Gbps) as the bandwidth of the physical interface 15 connected to the service network 3 by the caller node device 10A.

  Also, in the processing of S115, the core network instance 11A sets the identifier set in the service network instances 12A and 13A and the allocated bandwidth in association with the established optical path. FIG. 9B shows a specific example of the database stored in the storage unit 114 of the core network instance 11A when the core network instance 11A allocates resources to the service networks 3 and 4. The database shown in FIG. 9B includes items 911 to 913 respectively indicating “optical path identifier”, “optical path bandwidth”, and “allocation contents”. Furthermore, “assignment contents” are subdivided into “service network identifier” and “bandwidth (variable BW)”. For example, in response to the case where the “optical path identifier” is “5” and the “optical path bandwidth” is “2.4 Gbps”, the “service network identifier” is set to “15a”. A resource whose “width” is “1.6 Gbps” is set. Corresponding to this optical path, a resource with a “bandwidth” of “0.8 Gbps” is set in a service network with a “service network identifier” of “16a”.

  Then, in the process of S115, a specific example of the database stored in the storage unit 121 of the service network instance 12A after the core network instance 11A allocates resources to the service network 3, for example, is shown in FIG. It is shown in 9 (c). Compared with the database shown in FIG. 9A, the database shown in FIG. 9C is changed to “up” in the data of the item 903 indicating “state”, and the item indicating “resource bandwidth”. The data of 902 is changed to “1.6 Gbps”. Although not shown, for example, the Cost value may be changed from “10” to “100”.

  Returning to FIG. 8, the description of the operation will be continued. In step S117, the caller node device 10A advertises the identifier of the service network 3 and the changed allocated band to the plurality of service networks 3 and 4 as TE information by the advertising unit 123. The above describes the case where the process for the service network 3 is performed, but the same applies to the case where the process for the service network 4 is performed. In addition, the callee node device 20A performs the processing of step S318 to step S319. Since these processes are the same as the processes of Step S118 to Step S119 performed by the caller node device 10A, description thereof will be omitted.

  The caller node device 10A and the callee node device 20A can also be realized by executing a bandwidth allocation 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.

  According to the second embodiment, the resource of the path established in the core network 2 is flexibly changed at each control time according to the traffic amount of the service networks 3 and 4, thereby reducing the usage amount of the service networks 3 and 4. Accordingly, it is possible to arrange resources optimally and to improve resource utilization efficiency.

  In addition, according to the present embodiment, when the traffic of each service network increases rapidly in a short period of time compared to the initial prediction, compared to the case where resources are allocated to a plurality of service networks in advance and fixedly set, There is a great operational advantage in that it can be automatically changed without requiring changes in design or settings by the (operator).

  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 virtual interface ID is given as the path identifier and the logical interface ID is given as the service network identifier. However, the physical interface used for establishing the path, the established path identifier, and the provision destination The use of a virtual interface or the like is not essential if it can be stored in the database in association with the service network identifier.

  Moreover, in each embodiment, the interface which the sender | caller node apparatus 10 and the callee node apparatus 20 have in FIG. 1 is an example, Comprising: The number is not limited to this. In addition, although an example in which a single path is provided to the two service networks 3 and 4 has been shown, the number of service networks to be provided may be three or more, and in that case, priorities may be given in advance. Alternatively, priority may be given by the caller node device 10 and the callee node device 20. Further, a plurality of paths 5 may be established between the caller node device 10 and the callee node device 20. The number of node devices is arbitrary.

  In the second embodiment, the traffic management unit 115 is provided separately from the band allocation unit 113A. However, the band allocation unit 113A may be configured to execute the function of the traffic management unit 115.

It is explanatory drawing which shows typically the outline | summary of the boundary node apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the sender | caller node apparatus which concerns on 1st Embodiment of this invention. It is a block diagram which shows the structure of the callee node apparatus which concerns on 1st Embodiment of this invention. It is a flowchart which shows the bandwidth allocation method which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the specific example of the band allocation by the originator node apparatus shown in FIG. It is a block diagram which shows the structure of the sender | caller node apparatus which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structure of the callee node apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the band allocation method which concerns on 2nd Embodiment of this invention. It is explanatory drawing which shows the specific example of the band allocation by the sender | caller node apparatus shown in FIG.

Explanation of symbols

1 Core network 2, 3 Service network 5 Path 10 (10A) Sender node device (border node device)
11 (11A) Core network instance 111 Path establishment means 112 Core network management means 113 (113A) Bandwidth allocation means 114 Storage means 12 (12A) Service network instance 121 Storage means 122 Service network management means 123 Advertising means 124 Traffic measurement means 13 (13A) Service network instance 14, 15, 16 Physical interface 17 Transfer control means 171 Transfer processing means 172 Transfer table storage means 20 (20A) Callee node device (boundary node device)
21 (21A) Core network instance 211 Path establishment means 212 Core network management means 213 (213A) Bandwidth allocation means 214 Storage means 22 (22A) Service network instance 221 Storage means 222 Service network management means 223 Advertising means 224 Traffic measurement means 23 (23A) Service network instance 24, 25, 26 Physical interface 27 Transfer control means 271 Transfer processing means 272 Transfer table storage means 30 Relay node device 31 Path establishment means 32 Transfer control means 40, 50, 60, 70 Node device 41 , 51, 61, 71 Physical interface

Claims (12)

The core network and the plurality of services of a multilayer network formed by a plurality of different service networks each having a plurality of node devices, and a core network having a plurality of relay node devices and accommodating the plurality of service networks Predetermined as a partial resource of the optical path in the core network , which is a node device that exists at the boundary with the network and is a higher-order node device than the relay node device, and includes a core network instance and a plurality of service network instances A bandwidth allocation method for a border node device that allocates a bandwidth of the network to the service network,
The boundary node device is:
Depending on the core network instance,
A path establishing step of establishing an optical path with another boundary node device in the core network;
A core network management step of assigning an identifier to the established optical path and storing it in a storage means;
The service network is a providing destination of some resources of the established optical paths, grant identifiers, the bandwidth allocation step for allocating a predetermined bandwidth as part resource of the established optical paths,
Depending on the service network instance of the provider,
Bandwidth of the part of the allocated optical path resource in the service network identified by the assigned identifier when providing the part of the established optical path resource to the service network that is the destination A service network management step of providing provisionable state information indicating that the information can be provided and storing the information in a storage unit ;
An advertisement step of advertising information on the established optical path resources provided to the service network to which the provisionable state information is given to the plurality of service networks. Bandwidth allocation method. The boundary node device is:
The packet transfer destination includes physical interface information indicating an interface used as an end point of the optical path established in the path establishment step, an identifier assigned to the established optical path, and an identifier assigned in the bandwidth allocation step. The band allocation method according to claim 1, further comprising the step of associating with a preset transfer table. The bandwidth allocation step includes:
As a band predetermined as a partial resource of the established optical path, a band set in advance or the same band as a link resource connected to the service network to which the boundary node device is provided is allocated. The bandwidth allocating method according to claim 1 or 2, wherein: The core network management step includes:
Physical interface information indicating an interface used as an end point of the optical path established in the path establishment step, an identifier assigned to the established optical path, an identifier assigned in the bandwidth allocation step, and the established optical path 4. The bandwidth allocation method according to claim 2, wherein the bandwidth allocated as a partial resource is stored in the storage means in association with the bandwidth. The service network management step includes:
The identifier assigned to the service network which is the provision destination in the bandwidth allocation step is associated with the bandwidth allocated as a part of the resource of the established optical path, and is fixedly held in the database for the service network The bandwidth allocation method according to any one of claims 2 to 4, wherein: The boundary node device is:
Performing a traffic measurement step of measuring the traffic volume of the service network which is the provision destination;
The bandwidth allocation step includes:
Assigning a band according to the measured traffic volume in a variable manner among the path bands that can be provided by the established optical path as a predetermined band as a partial resource of the established optical path. 3. The bandwidth allocation method according to claim 1, wherein the bandwidth is allocated. The core network management step includes:
The physical interface information indicating the interface to be used as the end point of the optical path established by the path establishing step, the identifier assigned to the established optical path, and bandwidth of the established optical path, the band allocation step Characterized in that the identifier assigned in step (1), the bandwidth allocated as a partial resource of the established optical path, and attribute information of the partial resource of the established optical path are associated with each other and stored in the storage means. The bandwidth allocation method according to claim 6. The service network management step includes:
The identifier assigned to the service network which is the provision destination in the bandwidth allocation step is associated with the bandwidth allocated variably as a part of the resource of the established optical path, and updated to the database for the service network The bandwidth allocation method according to claim 6 or 7, wherein the bandwidth allocation method is held as possible. The advertising step includes:
When the allocated bandwidth fluctuates according to the traffic volume measured for the service network that is the provision destination, the identifier of the service network that is the provision destination and the information are changed as resource information of the established optical path. The band allocation method according to any one of claims 6 to 8, wherein the allocated band is advertised. The core network and the plurality of services of a multilayer network formed by a plurality of different service networks each having a plurality of node devices, and a core network having a plurality of relay node devices and accommodating the plurality of service networks a boundary node apparatus for providing a part resource in the service network of the optical path in the core network are present at the boundary of the network,
It is a node device higher than the relay node device, comprising a core network instance and a plurality of service network instances,
The core network instance is
Path establishing means for establishing an optical path with another boundary node device in the core network;
A core network management means for assigning an identifier to the established optical path and storing it in a storage means;
The service network is a providing destination of some resources of the established optical paths, grant identifiers, the bandwidth allocation means for allocating a predetermined bandwidth as part resource of the established optical paths, the Prepared,
Each service network instance is:
Bandwidth of the part of the allocated optical path resource in the service network identified by the assigned identifier when providing the part of the established optical path resource to the service network that is the destination Service network management means for providing provisionable state information indicating that the information can be provided and storing the information in a storage means ;
Boundary node apparatus, characterized in that it comprises an advertisement means for advertising the information resource of the established optical paths the providable status information is provided to the service network assigned to the plurality of service networks, respectively . The core network and the plurality of services of a multilayer network formed by a plurality of different service networks each having a plurality of node devices, and a core network having a plurality of relay node devices and accommodating the plurality of service networks A communication system having a caller node device and a callee node device respectively present at a boundary with a network ,
One of the caller node device and the callee node device is respectively
It is a node device higher than the relay node device, comprising a core network instance and a plurality of service network instances,
As an instance for the core network,
Path establishing means for establishing an optical path with the other device;
A core network management means for assigning an identifier to the established optical path and storing it in a storage means;
The service network is a providing destination of some resources of the established optical paths, grant identifiers, the bandwidth allocation means for allocating a predetermined bandwidth as part resource of the established optical paths, the Prepared,
As an instance for each service network,
Bandwidth of the part of the allocated optical path resource in the service network identified by the assigned identifier when providing the part of the established optical path resource to the service network that is the destination Service network management means for providing provisionable state information indicating that the information can be provided and storing the information in a storage means ;
Communication system, comprising an advertisement means for advertising the information resource of the established optical paths the providable status information is provided to the service network assigned to the plurality of service networks, respectively. A bandwidth allocation program for causing a computer to execute the bandwidth allocation method according to any one of claims 1 to 9.

Images