JP4199575B2 - Network system, path setting method in the system, network management device and network device used in the system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for realizing a high quality transfer service of packet data on a packet network such as an IP (Internet Protocol) network, and in particular, performs path setting at high speed when providing a high quality transfer path. It relates to a technique suitable for
[0002]
[Prior art]
The route control in the current IP network is generally performed autonomously by a node such as a router, but the route is centrally controlled by a network management device such as an NMS (Network Management System) or a policy server. There is also a technique. In this case, in response to a communication request or a path setting request from the user, a route is calculated on the network management apparatus side, and the calculated result is notified to the path setting unit of the node in the network to set the path. Alternatively, the network management apparatus may set directly without using the node path setting means.
[0003]
For example, in the case of path setting in an MPLS (Multi-Protocol Label Switching) network, in order to set the path, the network management apparatus that has performed the route calculation notifies the MPLS router as the end point of the path of the list of passing nodes, The MPLS router uses a path setting protocol such as RSVP-TE (resource reservation protocol for traffic engineering) protocol or CR-LDP (Constraint Routed Label Distribution Protocol) based on the transit node list notified from the network management device. Set the path.
[0004]
By the way, as an example of a service that provides a path to the user as described above, in a content distribution service [CDN (Contents Delivery Network) service], a path that maintains (guarantees) a certain communication quality [ Provision of QoS (Quality of Service) path is under consideration.
Here, an example of path setting in the conventional method when a content distribution service is assumed will be described with reference to FIG. In FIG. 27, 100 is a content delivery network, 200 is a user device that receives the CDN service, 300 is a content server that provides the CDN service, 400 is an NMS that centrally manages route control in the content delivery network 100, and the like. Each routing control device is represented, and 101 and 102 represent edge nodes constituting the content delivery network 100, respectively.
[0005]
In such a network system, first, when the user apparatus 200 issues a content distribution request (request) (1), the request is sent to an edge node (user-side edge node) 101 located at the entrance of the content distribution network 100. The edge node 101 transfers the request to the path control device 400 ((2)).
[0006]
When the routing control device 400 receives the request, the routing control device 400 transmits the requested content on the content delivery network 100 from the edge node 102 on the content server 300 side where the content requested by the request exists to the edge node 101 on the user side. A route (delivery route) that satisfies a predetermined quality (for example, bandwidth) required for distribution is calculated (route search; {circle around (3)}).
[0007]
When the delivery route is determined by this calculation (4), the route control device 400 generates a list of nodes in the content delivery network 100 through which the route passes, and the origin of the path to be set on the route. The generated node list (passing node list) is notified to the edge node 102 on the content server 300 side (5).
The edge node 102 uses a path setting protocol such as RSVP-TE (resource reservation protocol for traffic engineering) protocol or CR-LDP (Constraint Routed Label Distribution Protocol) based on the transit node list notified from the routing device 400. Then, a path is set for the delivery route ((6)).
[0008]
When the path setting is completed, the edge node 102 notifies the routing control device 400 to that effect ((7)), and the routing control device 400 notifies the content server 300 of the start of distribution ((8)). As a result, content distribution is started from the content server 300 to the user device 200 through the path set on the delivery route as described above ((9)).
[0009]
In addition, as a prior art, there exist a technique (product purchase system) as shown in the following patent document 1, and a technique (stream distribution network service method and system) as shown in the following patent document 2.
In the product purchase system described in Patent Document 1, the product information distribution apparatus accumulates product information and geographical route information transmitted from the store side in the storage unit, and adds the desired information transmitted from the transmission / reception terminal side. On the other hand, store information suitable for purchase is selected from the stored information and transmitted to the transmitting / receiving terminal side together with geographical route information to the store. As a result, a system that shows the route to the store where the desired product can be purchased to the user of the transmission / reception terminal and leads to the store by a car navigation system or the like is realized.
[0010]
On the other hand, the system described in Patent Document 2 selects a distribution network (best effort distribution network or the like) most suitable for the request information of the stream content requested by the client terminal and distributes the stream content. The content information is extracted from the list, the network most suitable for the content information is selected from a plurality of available stream distribution networks, or the distribution route is set, and the stream distribution server requests the client terminal. Content is distributed using a selected network or a set distribution route.
[0011]
[Patent Document 1]
JP 2001-357301 A
[Patent Document 2]
JP 2002-77257 A
[0012]
[Problems to be solved by the invention]
However, in the path setting method as described above, when the network ingress node or the route control device receives a user path setting request, at least the route control device is an edge in order to establish a path for the calculated route. You must pass the calculated route information (list of passing nodes) to the node.
[0013]
For this reason, a delay time corresponding to the path calculation time + route information notification time occurs from when the user request is generated until the path setting (path setup) is actually started. In other words, (1) If route calculation is performed after receiving a request from the user, the path setup time is delayed by the route calculation time. (2) When route calculation is performed with a centralized control type device, the calculation result is The path setup time is delayed by the time notified to the side. Specifically, in the example described above with reference to FIG. 27, the processes {circle around (2)} to {circle around (5)} correspond to the delay time until the service starts.
[0014]
Such a delay in path setting means that when the user requests content distribution, the service start (content delivery start) to the user is delayed, which is a factor that hinders prompt service provision. In Patent Document 1 and Patent Document 2 described above, the selection of geographical route information, the selection of a distribution network, or the setting of a distribution route does not take action until the user requests it. It is clear that this problem arises.
[0015]
The present invention has been devised in view of such problems, and when a user makes a content distribution request or communication (connection) request, the path setting is quickly completed, and the content distribution and communication can be performed quickly. The goal is to be able to get started.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, a network system according to the present invention (Claim 1) includes a network including a plurality of network devices and a network management device that centrally manages route control in the network. A route calculation unit that pre-calculates data transfer route information in the network that satisfies a specific standard for service contents provided between certain network devices periodically or when a predetermined event occurs, and the route A correspondence table creation unit for creating a correspondence table in which the data transfer path information obtained by the calculation unit is associated with the service content; A correspondence table transmission unit that transmits in advance the correspondence table created by the correspondence table creation unit to the network device as a user device that is a source of a data transfer request according to the service content by a user; Sona Yeah, the User apparatus But, A correspondence table holding unit that holds the correspondence table received from the network management device, and a data transfer corresponding to the data transfer request in the correspondence table held in the correspondence table holding unit when the data transfer request is made A data transfer request transmitting unit that includes path information in the data transfer request and transmits the data to another network device as an edge node device located at the entrance of the network. A data transfer request receiving unit for receiving the data transfer request, and a data transfer request receiving unit; Recieved The data transfer request include Data transfer path specified by the data transfer path information Network equipment on And a path setting processing unit for performing path setting processing for the above.
[0017]
Further, a path setting method in a network system according to the present invention (Claim 2) is provided in a network system including a network including a plurality of network devices and a network management device that centrally manages route control in the network. The network management apparatus calculates in advance data transfer path information in the network that satisfies a specific standard for service content provided between certain network apparatuses periodically or when a predetermined event occurs, and the obtained data transfer Create a correspondence table associating the route information with the service contents, The created correspondence table is transmitted in advance to the network device as the user device that is the source of the data transfer request according to the service content by the user, User apparatus But, When holding the correspondence table received from the network management device and making the data transfer request, the data transfer request includes the data transfer path information corresponding to the data transfer request in the held correspondence table. To the other network device as an edge node device located at the entrance of the network, and the edge node device Receive the data transfer request And included in the received data transfer request Data transfer path specified by the data transfer path information Network equipment on It is characterized by performing a path setting process for.
[0018]
Furthermore, a network management device used in the network system of the present invention (Claim 3) is a network management device used in a network system for centrally managing path control in a network comprising a plurality of network devices, In addition, or when a predetermined event occurs, a route calculation unit that pre-calculates data transfer route information in the network that satisfies a specific criterion with respect to service contents provided between the first network device and the second network device A correspondence table creation unit that creates a correspondence table in which the data transfer route information obtained by the route calculation unit is associated with the service content; The correspondence table created by the correspondence table creation unit is sent to the first network device as the user device that is the source of the data transfer request according to the service content by the user. In order to include the data transfer path information in the table, a correspondence table transmission unit that transmits in advance and It is characterized by having.
[0019]
The network device used in the network system of the present invention (Claim 4) is used in a network system including a network having a plurality of network devices and a network management device for centrally managing route control in the network. Is As a user device that is the source of the data transfer request issued by the user according to the service content provided between certain network devices In the network device, the network management device periodically or when a predetermined event occurs, The Data transfer route information in the network that satisfies a specific standard for service content is calculated in advance, and a route for receiving from the network management device a correspondence table created by associating the obtained data transfer route information with the service content A front receiver, A correspondence table holding unit that holds the correspondence table received by the routing table reception unit, and data corresponding to the data transfer request in the correspondence table held in the correspondence table holding unit when the data transfer request is made A data transfer request transmission unit that includes transfer path information in the data transfer request and transmits it to another network device as an edge node device located at the entrance of the network It is characterized by having.
[0020]
Furthermore, a path setting method in a network system according to the present invention (Claim 5) is provided in a network system including a network including a plurality of network devices and a network management device that centrally manages route control in the network. The network management device calculates in advance data transfer route information in the network that satisfies a specific data transfer quality between certain network devices periodically or when a predetermined event occurs, and the obtained data transfer route information , Edge nodes located on the entry and exit sides of the network apparatus Create a correspondence table that associates network device pairs as The created correspondence table is transmitted in advance to the network device as the user device that is the source of the connection request specifying the connection destination by the user, and the user device holds the correspondence table received from the network management device When the connection request is made, the data transfer path information corresponding to the connection request in the held correspondence table is included in the connection request and transmitted to the network device as the edge node device located on the entry side of the network. Then, the edge node device is removed from the user device. Receive the connection request And included in the received connection request Data transfer path specified by the data transfer path information Network equipment on It is characterized by performing a path setting process for.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[A] Description of the first embodiment
FIG. 1 is a block diagram showing the configuration of a network system as a first embodiment of the present invention. The system shown in FIG. 1 includes a plurality of routing nodes (hereinafter simply referred to as “nodes”) 11 such as routers. A network that centrally manages route control in a network 1, a plurality of user devices (user terminals) 2, a plurality of content servers 3, and a network 1 connected to the network 1 via a node (edge node) 11 nearest to the network 1 A management device (route control device) 4 is provided.
[0022]
Basically, this network system is supposed to provide a CDN service that distributes high-quality content such as movies and music, and the network 1 is a connection-oriented network such as MPLS. Further, among the nodes 11 constituting the network 1, nodes (relay nodes) 11 other than the edge node 11 are called “core nodes”. In the following description, the node 11, the user device 2, and the content server 3 may be collectively referred to as “network device”.
[0023]
In such a system, also in this embodiment, when a certain user device 2 issues a content distribution request, a network is used to distribute the requested content from the content server 3 that manages the requested content to the user device 2. In this embodiment, a delivery route (data transfer route) is determined and a path is set on the route. In this embodiment, a rapid path setting is realized, and a conventional delivery request is generated. The delay time until the start of content distribution can be reduced.
[0024]
For this reason, in this embodiment, for example, as shown in FIG. 2, the network management device 4 includes a path calculation unit 411, a correspondence table creation unit 412, and a route control unit 41 having functions as a correspondence table transmission unit 413 and resource management. The network device 11, 2, 3 is mainly provided with a correspondence table receiving unit 51, a correspondence table memory 52, a path setting unit (request sending unit) 53, and a user request receiving unit (user request processing unit). 54, a packet analysis unit 55, and the like are provided.
[0025]
Here, in the route control unit 41 of the network management device 4, the route calculation unit 411 performs a certain network periodically or when a predetermined event occurs (for example, when the load of the network management device 4 is small). A delivery route that satisfies specific criteria (for example, service quality such as bandwidth and allowable delay time) for content provided between devices (for example, edge node 11) is calculated and determined in advance. A known method may be applied to the advance calculation of the delivery route (Pre-Computation method).
[0026]
Also, the correspondence table creation unit 412 creates a correspondence table (table) that associates specific content with a calculated delivery route (data transfer route information) that is optimal for delivering the content. As shown in FIG. 3, a correspondence table 6 in which optimum calculated route information (passing node list) is associated with each of the contents A, B, C, D,... Is created. .
[0027]
In FIG. 3, certain contents A and B exist in SERVER_1, the route of NODE_1 → NODE_2 → NODE_3 → NODE_4 is the optimum delivery route for the content A, and content C exists in another SERVER_2. The route of NODE_2 → NODE_5 is optimal as the delivery route of the content C. Similarly, the content D exists in another SERVER_3, and the route of NODE_2 → NODE_3 → NODE_4 is optimum as the delivery route of the content D. It means that.
[0028]
The correspondence table transmission unit 413 transmits the correspondence table 6 created by the correspondence table creation unit 412 to the network device 11, 2, or 3 that receives a request message corresponding to the content requested by the user. The resource management unit 42 manages resources such as a bandwidth allocated to a link on the network 1, and has a resource contention avoidance function described later in item [C].
[0029]
On the other hand, in the network device 11, 2 or 3, the correspondence table receiving unit 51 receives the correspondence table 6 transmitted from the network management device 4, and the correspondence table memory 52 is the correspondence table receiving unit. The correspondence table 6 received at 51 is held.
The user request receiving unit (user request processing unit) 54 is basically a request message issued by the user device 2 (a data transfer request such as a content distribution request or a connection request), depending on a user request service. However, it also has functional units as shown in (1) to (3) below.
[0030]
(1) Correspondence table search function part for searching / acquiring the passing node list corresponding to the request message in the correspondence table 6
(2) The acquired transit node list is included in the path setting unit 53 or a path setting request for path setting (or transmitted together with the path setting request) to another network device (for example, the edge node 11). ) Passing node list forwarding function (path setting request processing) part
(3) A path setting completion notification function unit that issues a path setting completion notification to the path control device 4 by receiving a path setting completion notification from the path setting unit 53
In addition, when the path setting unit (path setting processing unit) 53 receives the request message issued by the user device 2, the path setting unit (path setting processing unit) 53 corresponds to the request message in the correspondence table 6 held in the correspondence table memory 52. The path setting process for the delivery route specified by the list is performed.
[0031]
Further, the packet analysis unit (layer 7 packet identification function unit) 55 normally has information on layer 3 (IP layer) or higher that can be identified at the edge node 11 on the user device 2 side or the content server 3 side [for example, This is implemented when it is necessary to capture the layer 7 (application layer) http message issued by the user apparatus 2, and it is thereby possible to capture a content distribution request sent as an http message. . A node having such a layer 7 packet identification function is generally called a layer 7 switch or the like.
[0032]
With the above configuration, in the system according to the present embodiment, each time the user apparatus 2 issues a request message, the passing node list is transmitted and received between the network management apparatus 4 and the network apparatus 11, 2, or 3. It is possible to quickly set a path without performing it.
Hereinafter, the path setting operation of this embodiment will be described. As the transmission destination of the correspondence table 6, there are four modes: user device 2, user-side edge node 11, content server 3 -side edge node 11, and content server 3. For transmission of the correspondence table 6, for example, communication using a command line interface or communication using TCP / IP can be applied. Hereinafter, a specific path setting operation will be described in detail for each aspect.
[0033]
(A1) When the correspondence table 6 is transmitted to the user device 2
First, a path setting method when the correspondence table 6 is transmitted from the network management apparatus 4 to the user apparatus 2 will be described with reference to FIGS.
As shown in FIG. 4, the network management device (route control device) 4 periodically transmits individual content provided by the network 1 to the edge node 11 (11A) on the user side. (Or when a predetermined event occurs), the route calculation unit 411 calculates in advance a delivery route that satisfies a specific service quality.
[0034]
Then, the route control device 4 uses the correspondence table creation unit 412 to generate a list of nodes through which the delivery route obtained by the route calculation passes in the network 1 (passed node list), and the content and the content are stored. The contents server 3 and the passing node list are associated with each other and stored in the memory or the like (not shown) as the correspondence table 6 described above with reference to FIG. 3 (step A1).
[0035]
Thereafter, the path control device 4 transmits the created correspondence table 6 to the user device 2 (step A2). When the user device 2 receives the correspondence table 6 by the correspondence table reception unit 51, the route control device 4 holds the correspondence table 6 in the correspondence table memory 52. To do.
The user device 2 sends a request message (content distribution request) to the network 1 when requesting distribution of a certain content. At that time, referring to the correspondence table 6 held in the correspondence table memory 52, A transit node list corresponding to the requested content is searched and acquired, and the list is included in a request message addressed to the content server 3 and transmitted to the edge router 11 (11A) on the user side (step A3). For example, when the request message is received by the user with a WEB server (not shown), the transit node list may be included in the http request message.
[0036]
When the user-side edge router 11A receives the request message at the user request receiving unit 54 (step B1 in FIGS. 5 and 6), the user-side edge router 11A extracts the transit node list in the message (steps in FIGS. 5 and 6). B2) Based on the transit node list, an MPLS path is set (established) using predetermined path setup signaling (path setup message) (step A4, step B3 in FIGS. 5 and 6).
[0037]
At this time, it is necessary to set the path from the edge node 11 (11B) on the content server 3 side through which the actual content (data) flows to the user side edge node 11A. For example, the GMPLS protocol is used as the path setting signaling protocol. It can be realized by using. The GMPLS (Generalized Multi-Protocol Label Switching) protocol is a protocol capable of setting a bidirectional path at a time.
[0038]
Thereafter, when the user side edge node 11A receives the path setting completion message and completes the path setting (step A5, step B4 in FIGS. 5 and 6), the user side edge node 11A sets the path to the path control device 4. Is completed (steps B5 and B6 in FIGS. 5 and 6), and the path control device 4 notifies the content server 3 of the start of distribution (step A6). As a result, the content server 3 starts distributing content to the user device 2 (step A7).
[0039]
It is not always necessary to notify the content server 3 of the path setting completion notification from the user side edge node 11A via the route control device 4. For example, the content server 3 may be notified directly from the user side edge node 11A.
(A2) When correspondence table 6 is transmitted to user-side edge node 11A
Next, the operation when the correspondence table 6 is sent to the user-side edge node 11A will be described in detail with reference to FIGS.
[0040]
Also in this example, as shown in FIG. 7, the routing control device 4 periodically transmits each content provided by the network 1 to the edge node 11 (11 </ b> A) on the user side. (Or when a predetermined event occurs), a delivery route satisfying a specific service quality is calculated in advance by the route calculation unit 411, and the delivery route obtained by the route calculation is converted into the network 1 by the correspondence table creation unit 412. A list of passing nodes (passing node list) is generated, the contents are associated with the content server 3 and the passing node list in which the contents are stored, and the correspondence table 6 described above with reference to FIG. (Step C1).
[0041]
Thereafter, the path control device 4 transmits the created correspondence table 6 to the user-side edge node 11A (step C2), and when receiving the correspondence table 6, the user-side edge node 11A holds the correspondence table 6 in the correspondence table memory 52.
When the user device 2 requests a certain content (content distribution request), the user device 2 sends a request message including content information (for example, an ID accompanying the content) to the user-side edge node 11A (step C3). . In this case as well, as described in the previous embodiment, it is conceivable to use an http request message.
[0042]
As shown in FIGS. 8 and 9, the user side edge node 11A receives the packet from the user apparatus 2 by the packet analysis unit 55 (step D1), and the packet analysis unit (layer 7 packet identification function unit) 55 , It is determined whether or not the received packet is the http request message. If it is an http request message, the packet analysis unit 55 transfers the message to the user request processing (reception) unit 54 (step D2), and the user request processing unit 54 extracts the content information in the request.
[0043]
Then, the user-side edge node 11A (user request processing unit 54) refers to the correspondence table 6 sent in advance from the route control device 4 and held in the correspondence table memory 52, and determines the route corresponding to the requested content. A transit node list is searched and acquired (route determination; step D3, step C4 in FIG. 7), and the transit node list is passed to the path setting unit 53 (step D4).
[0044]
As a result, the path setting unit 53 establishes an MPLS path using predetermined path setting signaling (path setting message) for the nodes in the passing node list received from the user request receiving unit 54 (step of FIG. 7). C5). At this time, it is necessary to set a path in the direction from the content server side edge node 11B through which the content actually flows to the user side edge node 11A. This case is also realized by using, for example, the GMPLS protocol as the path setting signaling protocol. Is possible.
[0045]
Thereafter, as shown in FIGS. 8 and 9, the user side edge node 11A (path setting unit 53) receives the path setting completion message from the content server side edge node 11B (step D5), and the path setting is completed. Then, the path setting unit 53 issues a path setting completion notification to the user request receiving unit 54 (step D6), and the user request receiving unit 54 issues a path setting completion notification to the path control device 4 (step D7, FIG. 7). Step C6).
[0046]
Upon receiving the path setting completion notification from the user-side edge node 11A, the route control device 4 issues a distribution start notification to the content server 3 (step C7) and receives the distribution start notification as shown in FIG. The content server 3 starts distributing content to the user device 2 (step C8). Also in this case, the path setting completion notification does not necessarily need to be notified to the content server 3 via the route control device 4, and may be directly notified from the user side edge node 11A to the content server 3. .
[0047]
(A3) When correspondence table 6 is transmitted to content server side edge node 11B
Next, the operation for sending the correspondence table 6 to the content server side edge node 11B will be described in detail with reference to FIGS.
Also in the case of this example, as shown in FIG. 10, the routing control device 4 periodically transmits individual contents provided by the network 1 to the edge node 11 (11 </ b> A) on the user side. (Or when a predetermined event occurs), a delivery route satisfying a specific service quality is calculated in advance by the route calculation unit 411, and the delivery route obtained by the route calculation is converted into the network 1 by the correspondence table creation unit 412. A list of passing nodes (passing node list) is generated, the contents are associated with the content server 3 and the passing node list in which the contents are stored, and the correspondence table 6 described above with reference to FIG. (Step E1).
[0048]
Thereafter, the path control device 4 transmits the created correspondence table 6 to the content server side edge node 11B (step E2), and the content server side edge node 11B receives the correspondence table 6 and stores it in the correspondence table memory 52. To do.
When the user device 2 requests a certain content (content distribution request), the user device 2 sends a request message including content information (for example, ID attached to the content) to the user side edge node 11A (step E3). . In this case as well, as described in the previous embodiment, it is conceivable to use an http request message.
[0049]
Here, since the destination of the http request message is the content server 3, as shown in FIGS. 11 and 12, the http request message finally passes through the immediately preceding content server side edge node 11B ( Step F1). At that time, the content server side edge node 11B determines whether or not the received message is a request message (content distribution request) to the content server 3 by the packet analysis unit (layer 7 packet identification function unit) 55. If it is a message, the message is transferred to the request message processing (reception) unit 54 (step F2).
[0050]
The user request processing unit 54 extracts the content information in the http request message transferred from the packet analysis unit 55 and refers to the correspondence table 6 held in advance in the correspondence table memory 52 based on the content information. Then, the passage node list of the route corresponding to the requested content is searched and acquired (route determination; step F3, step E4 in FIG. 10).
[0051]
The acquired transit node list is passed to the path setting unit 53 (step F4), and the path setting unit 53 uses the predetermined path setup signaling based on the transit node list from the content server side edge node 11B to the user side. An MPLS path to the edge node 11A is established (step F5, step E5 in FIG. 10). At this time, unlike the above-described example, at least a one-way path should be set from the content server side edge node 11B to the user side edge node 11A. Therefore, for example, the RSVP-TE protocol is used as the path setting signaling protocol. be able to. However, a bidirectional path may be set using the GMPLS protocol.
[0052]
After that, as shown in FIGS. 11 and 12, the content server side edge node 11B receives the path setting completion message from the user side edge node 11A and recognizes the completion of the path setting by the path setting unit 53 (step F6). Then, a path setting completion notification is issued to the route control device 4 through the user request processing unit 54 (steps F7 and F8, step E6 in FIG. 10).
[0053]
As shown in FIG. 10, when receiving the path setting completion notification from the content server side edge node 11B, the route control device 4 issues a distribution start notification to the content server 3 (step E7), and receives the distribution start notification. Then, the content server 3 starts distributing content to the user device 2 (step E8). Also in this case, the path setting completion notification does not necessarily have to pass through the route control device 4, and may be notified directly from the content server side edge node 11B to the content server 3.
[0054]
(A4) When the correspondence table 6 is transmitted to the content server 3
Next, the operation when sending the correspondence table 6 to the content server 3 will be described in detail with reference to FIGS.
Also in this example, as shown in FIG. 13, the routing control device 4 periodically transmits each content provided by the network 1 in order to transfer the content to the edge node 11 (11 </ b> A) on the user side. (Or when a predetermined event occurs), a delivery route satisfying a specific service quality is calculated in advance by the route calculation unit 411, and the delivery route obtained by the route calculation is converted into the network 1 by the correspondence table creation unit 412. A list of passing nodes (passing node list) is generated, the contents are associated with the content server 3 and the passing node list in which the contents are stored, and the correspondence table 6 described above with reference to FIG. (Step G1).
[0055]
Thereafter, the path control device 4 transmits the created correspondence table 6 to the content server 3 (step G2), and the content server 3 holds the correspondence table 6 in the correspondence table memory 52 when receiving the correspondence table 6.
When the user device 2 requests a certain content (content distribution request), the user device 2 sends a request message addressed to the content server 3 including content information (for example, ID attached to the content) to the user-side edge node 11A. (Step G3). In this case as well, as described in the previous embodiment, it is conceivable to use an http request message.
[0056]
As shown in FIGS. 14 and 15, when the content server 3 receives the request message (step H1), the content request 3 extracts content information in the received message by the user request reception unit 54, and based on the information in advance. With reference to the correspondence table 6 held in the correspondence table memory 52, a passing node list of a route corresponding to the requested content is searched and acquired (route determination; step H2, step G4 in FIG. 13).
[0057]
Then, the content server 3 notifies the content server side edge node 11B of the acquired passing node list included in the path setting request message (step H3, step G5 in FIG. 13). The content server-side edge node 11B that has received the transit node list establishes an MPLS path from the content server-side edge node 11B to the user-side edge node 11A using predetermined path setup signaling based on the transit node list ( Step H4, Step G6 in FIG. At this time, it is sufficient to set at least a one-way path from the content server side edge node 11B to the user side edge node 11A. Therefore, for example, the RSVP-TE protocol may be applied as the path setting signaling protocol in this case as well. it can. However, a bidirectional path may be set using the GMPLS protocol.
[0058]
Thereafter, when the path setting is completed and the content server side edge node 11B receives the path setting completion message from the user side edge node 11A as shown in FIGS. 14 and 15 (step H5), to the path control device 4 A path setting completion notification is issued (step H6, step G7 in FIG. 13), and the routing control device 4 issues a distribution start notification to the content server 3 upon receiving this path setting completion notification as shown in FIG. (Step G8).
[0059]
Upon receiving this distribution start notification, the content server 3 starts distributing content to the user device 2 (step G9). Also in this case, the path setting completion notification does not necessarily have to pass through the route control device 4, and may be notified directly from the content server side edge node 11B to the content server 3.
[0060]
As described above, in this embodiment, the route control device 4 performs route calculation in advance to create the correspondence table 6 and transmits it to the network device. When there is a request message from the user, the message is received. The acquired network device acquires a transit node list corresponding to the requested content content based on the correspondence table 6 transmitted in advance, and sets a path for the transit node 11 in the transit node list, Requests the edge node 11 to set a path.
[0061]
Therefore, when the user request message is received, the path can be immediately set based on the transit node list included in the request message or held by the edge node 11 without communicating with the route control device 4. The time from reception to the start of content distribution can be greatly shortened.
[0062]
[B] Description of the second embodiment
The path setting method described above can be applied not only to content distribution services but also to all data transfer services using paths such as best effort services. For example, the present invention can be applied to a case where a file is transferred by setting a path between arbitrary user apparatuses 2 across the network 1 (see FIG. 1).
[0063]
In this case, instead of associating the content with the route information as in the first embodiment described above, the pair of edge nodes 11 to be transferred by the user and the route between the edge nodes 11 are associated with each other. The correspondence table is created in the route control device 4 (route control unit 41).
That is, in this case, the route control device 4 (route control unit 41) calculates a route (for example, the shortest route) satisfying a specific quality between specific edge nodes 11 in the network 1 in advance. As shown in FIG. 16, a correspondence table that associates a set of an incoming edge node 11 and an outgoing edge node 11 (address) with a list of passing nodes 11 that pass between the edge nodes 11 (passing node list). 6A is created.
[0064]
For example, in FIG. 16, the path of EDGE_A → CORE_1 → CORE_3 → EDGE_B satisfies the reference quality between the input edge node EDGE_A and the output edge node EDGE_B, and the input edge node EDGE_A and the output edge It means that the route of EDGE_A → CORE_1 → EDGE_C satisfies the reference quality with the node EDGE_C. Others are the same. Also in this embodiment, a known method may be applied as a specific method for calculating the route between the edge nodes 11.
[0065]
In the present embodiment, such a correspondence table 6A is transmitted from the path control device 4 to the network device. As the transmission destination, the user device (user terminal) 2 and the user-side edge node 11A can be considered. The transmission means of the correspondence table 6A is not particularly limited as in the first embodiment. For example, communication using a command line interface or communication using TCP / IP can be applied.
[0066]
Note that the network devices such as the node 11 and the user device 2 are basically configured in the present embodiment also with the same configuration as that of the first embodiment described above with reference to FIG. The correspondence table 6A transmitted from the route control device 4 is received, and the received correspondence table 6A is held in the correspondence table memory 52.
When the path setting unit 53 receives a request message (connection request) issued by the user device 2 (on the transmission side), the path setting unit 53 uses the corresponding passing node list in the correspondence table 6A held in the correspondence table memory 52. A path setting process is performed for the specified delivery route.
[0067]
Further, in this case, the user request receiving unit (user request processing unit) 54 also (1) a correspondence table search function for searching and acquiring a passing node list corresponding to the request message issued by the user device 2 in the correspondence table 6A. And (2) a transit node list transfer function unit for transferring the acquired transit node list to the path setting unit 53 and other network devices for path setting, but unlike the first embodiment, (3 ) A path setting completion notification function unit that issues a path setting completion notification to the user apparatus 2 on the transmission side by receiving a path setting completion notification from the path setting unit 53 is also provided.
[0068]
The packet analysis unit (layer 7 packet identification function unit) 55 is for capturing a request message (connection request) sent as an http message, as in the first embodiment.
Hereinafter, the operation (path setting method) of the network system according to the second embodiment configured as described above will be described in detail for each transmission destination of the correspondence table 6.
[0069]
(B1) When transmitting the correspondence table 6A to the user device 2 (on the transmission side)
First, a path setting method when the correspondence table 6A is transmitted from the path control device 4 to the user device 2 on the transmission side will be described with reference to FIGS. In the following, for convenience of explanation, the request message (connection request) transmission side user device 2 is issued by the transmission terminal 2S, the reception side (connection destination) user device 2 is issued by the destination terminal 2R, and the transmission side user device 2S. The incoming edge node 11 that receives the request message at the entrance of the network 1 is the transmitting edge node 11S, and the outgoing edge node 11 that forwards the request message to the receiving user device 2R that is the destination of the request message is the receiving edge node 11R. Sometimes written.
[0070]
As illustrated in FIG. 17, the path control device 4 periodically (or when a predetermined event occurs) causes the path calculation unit 411 to select a data transfer path that satisfies a specific service quality between the edge nodes 11 on the network 1. The correspondence table creation unit 412 calculates in advance a list of nodes through which the route obtained by the route calculation passes in the network 1 (passing node list), and the address of the passing node list and the incoming edge node 11 The correspondence table 6A described above with reference to FIG. 16 is created in association with the address of the outgoing edge node 11, and the correspondence table 6A is held in a memory or the like (not shown) (step J1).
[0071]
Then, the route control device 4 transmits the created correspondence table 6A to the transmission terminal 2S (step J2). When the transmission terminal 2S receives the correspondence table 6A by the correspondence table reception unit 51, the correspondence table memory 52 stores the correspondence table 6A. Hold. Thereafter, the transmission terminal 2S designates a destination (destination terminal 2R) to be communicated, and sends a connection request message to the network 1 side (step J3). At that time, the transmitting terminal 2S searches and obtains a passing node list for a route between the receiving edge node 11R and the transmitting edge node 11S corresponding to the destination in the correspondence table 6A, and uses the list as a connection request message. To the transmission-side edge node 11S.
[0072]
When the user request receiving unit 54 receives (supplements) the connection request message (step K1 in FIGS. 18 and 19), the transmitting edge node 11S extracts the passing node list in the message and extracts the path setting unit 53. (Step K2 in FIGS. 18 and 19). The path setting unit 53 sets (establishes) an MPLS path using predetermined path setting signaling (path setting message) based on the transit node list (step J4, step K3 in FIGS. 18 and 19).
[0073]
At this time, it is sufficient to set a unidirectional path from at least the transmission-side edge node 11S to the reception-side edge node 11R. Therefore, for example, the RSVP-TE protocol can be applied as the path setting signaling protocol. However, also in this case, a bidirectional path may be set using the GMPLS protocol.
Thereafter, when the transmission side edge node 11S receives the path setting completion message and completes the path setting (step K4 in FIGS. 18 and 19), the transmission side edge node 11S notifies the transmission terminal 2S of the completion of the path setting. (Step J5, Steps K5 and K6 in FIGS. 18 and 19). Thereby, the transmission terminal 2S starts data transmission with respect to the destination terminal 2R (step J6).
[0074]
Contrary to the above, when the destination terminal 2R is the transmission terminal and the transmission terminal 2S is the destination terminal, communication is possible by the same path setting as described above.
(B2) When transmitting the correspondence table 6A to the transmission-side edge node 11S
Next, a path setting method when the correspondence table 6A is transmitted from the path control device 4 to the transmission-side edge node 11S will be described with reference to FIGS.
[0075]
Also in this case, as shown in FIG. 20, the route control device 4 periodically (or when a predetermined event occurs) routes a data transfer route that satisfies a specific quality of service between the edge nodes 11 on the network 1. The calculation unit 411 calculates in advance, and the correspondence table creation unit 412 generates a list of nodes through which the route obtained by the route calculation passes in the network 1 (passing node list), and the passing node list and the incoming edge The correspondence table 6A described above with reference to FIG. 16 is created by associating the address of the node 11 and the address of the outgoing edge node 11, and the correspondence table 6A is held in a memory or the like (not shown) (step L1).
[0076]
Then, the path control device 4 transmits the created correspondence table 6A to the transmission-side edge node 11S (step L2). When the transmission-side edge node 11S receives the correspondence table 6A by the correspondence table reception unit 51, the correspondence table 6A responds. Stored in the table memory 52.
Thereafter, the transmission terminal 2S designates a destination (destination terminal 2R) to be communicated and sends a connection request message to the network 1 side (step L3). When the transmission side edge node 11S that receives the message at the entrance of the network 1 receives and supplements the connection request message in the user request reception unit 54 (step M1 in FIGS. 21 and 22), the transmission side edge node 11S The addresses of the node 11S and the destination (reception) side edge node 11R are extracted.
[0077]
Further, the user request receiving unit 54 refers to the correspondence table 6A held in the correspondence table memory 52 based on the extracted address, and passes through the node list for the route corresponding to the pair of addresses on the transmission side and the reception side. Is obtained (step M2 in FIGS. 21 and 22), and this is passed to the path setting unit 53 (step M3 in FIGS. 21 and 22).
[0078]
The path setting unit 53 sets the MPLS path using the required path setting signaling based on the transit node list (step L4, step M4 in FIGS. 21 and 22). Also in this case, it is only necessary to set a one-way path from the transmission-side edge node 11S to the reception-side edge node 11R. Therefore, for example, the RSVP-TE protocol can be applied as the path setting signaling protocol, but the GMPLS protocol is used. A bidirectional path may be set.
[0079]
Thereafter, when the transmission side edge node 11S receives the path setting completion message and completes the path setting (step M5 in FIGS. 21 and 22), the transmission side edge node 11S passes the user request reception unit 54 through the transmission terminal 2S. Is notified of the completion of the path setting (step L5, steps M6 and M7 in FIGS. 21 and 22). Thereby, the transmission terminal 2S starts data transmission with respect to the destination terminal 2R (step L6).
[0080]
Also in this case, contrary to the above, even when the destination terminal 2R is the transmission terminal and the transmission terminal 2S is the destination terminal, communication is possible by the same path setting as described above.
As described above, in the second embodiment, the route control device 4 performs route calculation in advance to create the correspondence table 6A and transmits the correspondence table 6A to the network device. The network device that has received the message acquires a passing node list according to the request based on the correspondence table 6A transmitted in advance, and sets a path for the passing node 11 in the passing node list, or an edge node 11 is requested to set a path.
[0081]
Therefore, when the user request message is received, the path can be immediately set based on the transit node list included in the request message or held by the edge node 11 without communicating with the route control device 4. The time from reception to communication start can be significantly reduced.
[C] Avoiding resource contention when receiving requests
As described above, by performing the path setting of the present embodiment, it becomes possible to realize a rapid path setting. For example, when receiving a request from a user and setting the path, it is necessary to secure resources. There is a possibility of contention on resources (bandwidth, etc.) when doing so.
[0082]
That is, when the reserved bandwidth is managed for each link in the route control device 4 and a necessary amount is secured when setting a path, a request using the same link or route is sent from another location (node). If it occurs at the same time, it is expected that resource contention will occur. For example, if a bandwidth exceeding the acceptable bandwidth is requested for a certain link, either request cannot be accepted (rejected). )
[0083]
For example, as schematically shown in FIG. 23, the path control device 4 has already reserved (reserved) the bandwidth “B” for other requests out of the logical bandwidth for a certain link L, and can accept it. In a state where the remaining bandwidth is “A”, requests with the requested bandwidth = “C” and the requested bandwidth = “D” (where bandwidth “A” <band “C” + band “D”) are simultaneously generated. If this happens, one of the requests will be rejected.
[0084]
In order to prevent such a phenomenon, the path control device 4 of the present embodiment is provided with a resource management unit 42 (see FIG. 2) as shown in FIG. When the correspondence table creating unit 412 creates the correspondence table 6 or 6A and the correspondence table transmission unit 413 transmits the correspondence table 6 or 6A to the network device, the resource management unit 42 updates the corresponding route (link) by reducing the management band. To do.
[0085]
For example, as schematically shown in FIG. 24, when a route satisfying a certain quality (bandwidth B1 Mbps) is searched in the route control device 4 (route control unit 41), a route R1 passing through the link L is found. The resource management unit 42 reserves a band B1 for the path R1 with respect to the link L. This band is a band in which only traffic passing through the route R1 can be used. Similarly, if the route control unit 41 searches for a route satisfying a certain quality (bandwidth B2 Mbps) and finds a route R2 that passes through the same link L, the resource management unit 42 uses the route R2 for the link L. To secure the bandwidth B2.
[0086]
That is, for the route to the correspondence table 6 or 6A created / transmitted, a bandwidth is secured in advance before the user's request. This makes it possible to prevent resource contention when requests occur at the same time.
[D] Other
Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
[0087]
For example, the correspondence table 6 used in the first embodiment associates the content of the content server 3 with the calculated route (passing node list), but the object associated with the route is not necessarily the content. Not limited. For example, as shown below, it is also possible to associate attribute values of content or other indices with routes.
[0088]
(D1) Corresponding to content capacity (content size)
For example, for content having a particularly large file size or transfer data amount, it can be expected that transfer delay time can be shortened by associating with a route having a margin in a band different from those of other content sizes. . For example, as shown in FIG. 25, the correspondence table 6B is created by dividing the correspondence path according to the case where the content capacity is 1 Mbytes or less, 10 Mbytes or less, 50 Mbytes or less, 50 Mbytes or more. Thus, according to the content capacity requested by the user, an optimum path for the content capacity can be set at high speed.
[0089]
(D2) Content and service type and association
For example, the quality required for the path differs between video streaming and file transfer such as software download. In video streaming, the quality cannot be guaranteed unless a bandwidth of several Mbit / s is secured, but it is not always necessary to guarantee the bandwidth in file transfer. Therefore, more efficient transfer can be realized by dividing the route through according to the content type.
[0090]
For example, as shown in FIG. 26, the correspondence table 6C is created by dividing the route to be associated according to the type of moving image streaming, audio streaming, image file, text file, or the like. At this time, for the display of the content type, an identifier or the like representing each can be used. This makes it possible to quickly set an optimum path for the type of content or service requested by the user.
[0091]
[E] Appendix
(Appendix 1) A network comprising a plurality of network devices;
A network management device that centrally manages routing control in the network;
The network management device
A route calculation unit that pre-calculates data transfer route information in the network that satisfies a specific criterion for service content provided between certain network devices periodically or when a predetermined event occurs;
A correspondence table creation unit that creates a correspondence table that associates the data transfer route information obtained by the route calculation unit with the service content;
A network device that receives a data transfer request according to the service content by a user,
A data transfer request receiving unit for receiving the data transfer request;
When the data transfer request is received by the data transfer request receiving unit, the data transfer route information corresponding to the data transfer request of the correspondence table created in advance by the correspondence table creating unit of the network management device is used. A network system comprising a path setting processing unit that performs path setting processing for a specified data transfer path.
[0092]
(Supplementary note 2) In a network system comprising a network comprising a plurality of network devices and a network management device for centrally managing path control in the network,
The network management device
Periodically or when a predetermined event occurs, data transfer path information in the network that satisfies a specific criterion for service content provided between certain network devices is calculated in advance,
Create a correspondence table associating the requested data transfer path information with the service contents,
A network device that receives a data transfer request according to the service content by a user,
When the data transfer request is received, a path setting process for the data transfer path specified by the data transfer path information corresponding to the data transfer request of the correspondence table created in advance by the network management device is performed. A path setting method in a network system.
[0093]
(Supplementary Note 3) The network management device transmits the correspondence table to the network device as the user device that is the source of the data transfer request,
The data corresponding to the data transfer request in the correspondence table received from the network management device and the data transfer request to the other network device as the user device side edge node device located at the entrance of the network by the user device Send the transfer route information,
The network system according to appendix 2, wherein the user device side edge node device performs a path setting process for a network device on a data transfer path specified by the data transfer path information received from the user apparatus. Path setting method.
[0094]
(Supplementary Note 4) The network management device receives the data transfer request from the network device as the user device that is the issuing source of the data transfer request, to the network device as the user device side edge node device that receives the data transfer request at the entrance of the network. Send the correspondence table,
When the user device side edge node device receives the data transfer request from the user device, the data transfer specified by the data transfer path information corresponding to the data transfer request in the correspondence table received from the network management device The path setting method in the network system according to appendix 2, wherein path setting processing is performed for a network device on a route.
[0095]
(Supplementary Note 5) From the network device as a service providing device that provides data according to the service content, to the network device as an edge node device on the service providing device side that receives the data at the entrance of the network Send the correspondence table,
When the service providing device side edge node device receives the data transfer request issued by the user device, it is specified by the data transfer path information corresponding to the data transfer request in the correspondence table received from the network management device. 3. A path setting method in a network system according to appendix 2, wherein path setting processing is performed for a network device on a data transfer path.
[0096]
(Supplementary Note 6) The network management device transmits the correspondence table to a network device serving as a service providing device that provides data according to the service content,
When the service providing apparatus receives the data transfer request issued by the network apparatus as the user apparatus that is the source of the data transfer request, the service providing apparatus responds to the data transfer request in the correspondence table received from the network management apparatus. Transmitting the data transfer path information from the service providing apparatus to a network apparatus as an edge node apparatus on the service providing apparatus side that receives data corresponding to the service content at the entrance of the network;
The network according to appendix 2, wherein the service providing device side edge node device performs a path setting process for a network device on a data transfer path specified by the data transfer path information received from the service providing apparatus. Path setting method in the system.
[0097]
(Supplementary note 7) A network management device used in a network system for centrally managing path control in a network including a plurality of network devices,
Path calculation for preliminarily calculating data transfer path information in the network that satisfies a specific criterion for service contents provided between the first network apparatus and the second network apparatus periodically or when a predetermined event occurs And
A network management apparatus for use in a network system, comprising: a correspondence table creation unit that creates a correspondence table in which the data transfer route information obtained by the route calculation unit is associated with the service contents.
[0098]
(Additional remark 8) It is characterized by further comprising a correspondence table transmission unit for transmitting the correspondence table created by the correspondence table creation unit to a network device that receives a data transfer request according to the service content by the user. A network management device used in the network system according to appendix 7.
(Supplementary note 9) The network system according to supplementary note 7 or supplementary note 8, further comprising a resource management unit that secures a resource to be allocated to the data transfer path specified by the data transfer path information in the correspondence table Network management device used for
(Supplementary Note 10) A network device used in a network system including a network including a plurality of network devices and a network management device that centrally manages route control in the network,
In the network management device, data transfer path information in the network that satisfies a specific standard for service contents provided between certain network devices periodically or when a predetermined event occurs is calculated in advance and obtained. A route table receiving unit that receives a correspondence table created by associating transfer route information with the service content from the network management device;
A data transfer request receiving unit for receiving a data transfer request according to the service content by the user;
When the data transfer request is received by the data transfer request receiver, the path for the data transfer path specified by the data transfer path information corresponding to the data transfer request in the correspondence table received by the path table receiver A network device used in a network system, comprising a path setting processing unit for performing setting processing.
[0099]
(Supplementary Note 11) The path setting processing unit
When the data transfer request is received by the data transfer request receiving unit, the data transfer request on the data transfer path specified by the data transfer path information corresponding to the data transfer request in the correspondence table received by the path table receiving unit 11. The network device used in the network system according to appendix 10, further comprising a path setting request processing unit that makes a path setting request to another network device.
[0100]
(Supplementary Note 12) The path setting processing unit
When the data transfer request is received by the data transfer request receiving unit, the data transfer route information corresponding to the data transfer request in the correspondence table received by the routing table receiving unit is specified by the data transfer route information 11. A network device for use in a network system according to appendix 10, characterized by comprising a path setting request processing unit that transmits a path setting request to another network device on the data transfer path.
[0101]
(Supplementary note 13) A network comprising a plurality of network devices;
A network management device that centrally manages routing control in the network;
The network management device
A route calculation unit that pre-calculates data transfer route information in the network that satisfies a specific data transfer quality between certain network devices periodically or when a predetermined event occurs;
A correspondence table creation unit that creates a correspondence table that associates the data transfer route information obtained by the route calculation unit with a set of network devices as edge nodes located on the entry side and the exit side of the network; ,
A network device that receives a connection request specifying a connection destination by a user,
A connection request receiving unit for receiving the connection request;
When the connection request is received by the connection request reception unit, the connection request is specified by the data transfer path information corresponding to the connection destination of the correspondence table created in advance by the correspondence table creation unit of the network management device A network apparatus used in a network system, characterized by comprising a path setting processing unit for performing path setting processing for a data transfer path.
[0102]
(Supplementary note 14) a network comprising a plurality of network devices;
A network management device that centrally manages routing control in the network;
The network management device
Periodically or when a predetermined event occurs, data transfer path information in the network that satisfies a specific data transfer quality between certain network devices is calculated in advance,
Create a correspondence table associating the obtained data transfer path information with a set of network devices as edge nodes located on the entry side and the exit side of the network,
A network device that receives a connection request specifying a connection destination by a user,
When the connection request is received, path setting processing for the data transfer path specified by the data transfer path information corresponding to the connection destination of the correspondence table created in advance by the correspondence table creation unit of the network management device is performed. A path setting method in a network system, characterized in that:
[0103]
(Supplementary Note 15) The network management device transmits the correspondence table to a network device as a user device that is an issuer of the connection request,
The data transfer path information corresponding to the connection destination in the correspondence table received from the network management device and the connection request received from the network management device by the user device to the other network device as the ingress edge node located at the entrance of the network And send
15. The network system according to appendix 14, wherein the ingress edge node performs path setting processing for another network device on a data transfer path specified by the data transfer path information received from the user apparatus. Path setting method.
[0104]
(Supplementary Note 16) The network management device transmits the correspondence table from a network device as a user device that is an issuer of the connection request to a network device as an ingress edge node that receives the connection request at the entrance of the network. And
When the incoming edge node receives the connection request from the user apparatus, the other on the data transfer path specified by the data transfer path information corresponding to the connection destination in the correspondence table received from the network management apparatus 15. The path setting method in the network system according to appendix 14, wherein path setting processing is performed for the network device.
[0105]
(Supplementary Note 17) A network management device used in a network system for centrally managing path control in a network including a plurality of network devices,
A route calculation unit that pre-calculates data transfer route information in the network that satisfies a specific data transfer quality between certain network devices periodically or when a predetermined event occurs;
There is provided a correspondence table creation unit that creates a correspondence table in which the data transfer route information obtained by the route calculation unit is associated with a set of network devices as edge nodes located on the entry side and the exit side of the network. A network management device used in a network system, characterized in that
[0106]
(Supplementary note 18) The network according to supplementary note 17, further comprising a correspondence table transmission unit that transmits the correspondence table created by the correspondence table creation unit to a network device that receives the connection request by a user. Network management device used in the system.
(Supplementary note 19) The network system according to supplementary note 17 or supplementary note 18, further comprising a resource management unit that secures a resource allocated to the data transfer path specified by the data transfer path information in the correspondence table. Network management device used for
[0107]
(Supplementary note 20) A network device used in a network system including a network including a plurality of network devices and a network management device that centrally manages path control in the network,
In the network management apparatus, data transfer path information in the network that satisfies a specific data transfer quality between certain network apparatuses is calculated in advance periodically or when a predetermined event occurs, and the obtained data transfer path information A routing table receiving unit that receives a correspondence table created by associating a pair of network devices as edge nodes located on the entry side and the exit side of the network from the network management device;
A connection request receiving unit for receiving a connection request specifying a connection destination by a user;
When the connection request is received by the connection request receiving unit, path setting processing for the data transfer path specified by the data transfer path information corresponding to the connection destination in the correspondence table received by the path table receiving unit is performed. A network device for use in a network system, comprising a path setting processing unit.
[0108]
(Supplementary Note 21) The path setting processing unit
When the connection request is received by the connection request receiving unit, another network on the data transfer path specified by the data transfer path information corresponding to the connection destination in the correspondence table received by the path table receiving unit 20. A network device used for a network system according to appendix 19, further comprising a path setting request processing unit that makes a path setting request to the device.
[0109]
(Supplementary Note 22) The path setting processing unit
When the connection request is received by the connection request reception unit, the data transfer path information corresponding to the connection destination in the correspondence table received by the path table reception unit is identified by the data transfer path information. A network device used in a network system, comprising a path setting request processing unit that transmits a path setting request to another network device on a transfer path.
[0110]
【The invention's effect】
As described above in detail, according to the present invention, the network management device calculates in advance data transfer path information that satisfies a specific criterion between certain network devices periodically or when a predetermined event occurs, A correspondence table in which the obtained data transfer path information and the service content are associated is created, and when the network device receives the data transfer request, the data transfer request of the correspondence table created in advance by the network management device Since the path setting process for the data transfer path specified by the corresponding data transfer path information is performed, when a user data transfer request is received, the transit node list held by the network apparatus without communicating with the network management apparatus The path can be set immediately based on the It can be shortened to.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a network system as a first embodiment of the present invention.
2 is a block diagram showing a configuration of a network management device and a network device in the network system shown in FIG. 1. FIG.
FIG. 3 is a diagram showing an example of a correspondence table in the first embodiment.
4 is a diagram for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to a user device). FIG.
FIG. 5 is a diagram for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to a user device).
6 is a flowchart for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to a user device). FIG.
7 is a diagram for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to a user-side edge node). FIG.
8 is a diagram for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to a user-side edge node). FIG.
9 is a flowchart for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to a user-side edge node).
10 is a diagram for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to an edge node on the content server side). FIG.
11 is a diagram for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to an edge node on the content server side). FIG.
12 is a flowchart for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to an edge node on the content server side).
13 is a diagram for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to a content server). FIG.
14 is a diagram for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to a content server). FIG.
15 is a flowchart for explaining the operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to a content server).
FIG. 16 is a diagram showing an example of a correspondence table in the second embodiment of the present invention.
FIG. 17 is a diagram for explaining the operation of the network system according to the second embodiment (when a correspondence table is transmitted to a transmission terminal);
FIG. 18 is a diagram for explaining the operation of the network system according to the second embodiment (when a correspondence table is transmitted to a transmission terminal).
FIG. 19 is a flowchart for explaining the operation of the network system according to the second embodiment (when a correspondence table is transmitted to a transmission terminal);
FIG. 20 is a diagram for explaining the operation of the network system according to the second embodiment (when a correspondence table is transmitted to a transmission-side edge node).
FIG. 21 is a diagram for explaining the operation of the network system according to the second embodiment (when a correspondence table is transmitted to a transmission-side edge node).
FIG. 22 is a flowchart for explaining the operation of the network system according to the second embodiment (when a correspondence table is transmitted to a transmission-side edge node).
FIG. 23 is a schematic diagram for explaining a competition phenomenon by a conventional method of resource management.
FIG. 24 is a schematic diagram for explaining resource management in the first and second embodiments.
FIG. 25 is a diagram showing another example of the correspondence table shown in FIGS. 3 and 16;
26 is a diagram showing another example of the correspondence table shown in FIG. 3 and FIG. 16;
FIG. 27 is a diagram for explaining a path setting example in a conventional method;
[Explanation of symbols]
1 network
2 User device (network device)
2S user equipment (transmission terminal)
2R user equipment (destination terminal)
3 Content server (network device)
4 Network management device (route control device)
41 Route control unit
411 Route calculation unit
412 Correspondence table creation part
413 Correspondence table transmitter
42 Resource Management Department
6,6A-6C correspondence table
11, 11A, 11B, 11S, 11R Routing node (network device)
51 Correspondence table receiver
52 Correspondence table memory
53 Path setting part (request sending part)
54 User Request Receiving Unit (User Request Processing Unit)
55 Packet analyzer

Claims (5)

A network comprising a plurality of network devices;
A network management device that centrally manages routing control in the network;
The network management device
A route calculation unit that pre-calculates data transfer route information in the network that satisfies a specific criterion for service content provided between certain network devices periodically or when a predetermined event occurs;
A correspondence table creation unit for creating a correspondence table in which the data transfer route information obtained by the route calculation unit is associated with the service content ;
The correspondence table created by the table-making unit, e Zona a correspondence table transmitting unit that transmits beforehand to the network device as a user device which has issued the data transfer request according to the service content by the user ,
The user equipment is
A correspondence table holding unit for holding the correspondence table received from the network management device;
When performing the data transfer request, the edge node located at the entrance of the network including the data transfer path information corresponding to the data transfer request in the correspondence table held in the correspondence table holding unit in the data transfer request Including a data transfer request transmission unit that transmits to another network device as a device,
The edge node device is
A data transfer request receiving unit for receiving the data transfer request from the user device ;
A path setting processing unit configured to perform path setting processing for a network device on the data transfer path specified by the data transfer path information included in the data transfer request received by the data transfer request receiving unit; A network system characterized by In a network system comprising a network comprising a plurality of network devices and a network management device for centrally managing path control in the network,
The network management device
Periodically or when a predetermined event occurs, data transfer path information in the network that satisfies a specific criterion for service content provided between certain network devices is calculated in advance,
Create a correspondence table associating the requested data transfer path information with the service contents,
The created correspondence table is transmitted in advance to the network device as the user device that is the source of the data transfer request according to the service content by the user,
The user equipment is
Holding the correspondence table received from the network management device;
When the data transfer request is made, another network device as an edge node device located at the entrance of the network by including the data transfer path information corresponding to the data transfer request in the correspondence table held in the data transfer request Send to
The edge node device is
Receiving the data transfer request from the user device ;
A path setting method in a network system, wherein path setting processing is performed for a network device on a data transfer path specified by the data transfer path information included in the received data transfer request . A network management device used in a network system for centrally managing path control in a network comprising a plurality of network devices,
Path calculation for preliminarily calculating data transfer path information in the network that satisfies a specific criterion for service contents provided between the first network apparatus and the second network apparatus periodically or when a predetermined event occurs And
A correspondence table creation unit for creating a correspondence table in which the data transfer route information obtained by the route calculation unit is associated with the service content ;
The correspondence table created by the correspondence table creation unit is transferred to the first network device as a user device that is the source of the data transfer request according to the service content by the user. A network management apparatus used in a network system, comprising a correspondence table transmission unit that transmits in advance so that data transfer path information can be included . Data transfer by a user according to the contents of service provided between certain network devices , used in a network system having a network comprising a plurality of network devices and a network management device that centrally manages routing control in the network The network device as a user device that is the issuer of the request ,
In the network management device, data transfer route information in the network that satisfies a specific standard for the service content is calculated in advance periodically or when a predetermined event occurs, and the obtained data transfer route information and the service content And a routing table receiving unit that receives the correspondence table created by associating with the network management device,
A correspondence table holding unit for holding the correspondence table received by the route table receiving unit;
When performing the data transfer request, the edge node located at the entrance of the network including the data transfer path information corresponding to the data transfer request in the correspondence table held in the correspondence table holding unit in the data transfer request What is claimed is: 1. A network device used in a network system, comprising a data transfer request transmission unit that transmits to another network device as a device. A network comprising a plurality of network devices;
In a network system comprising a network management device that centrally manages routing control in the network,
The network management device
Periodically or when a predetermined event occurs, data transfer path information in the network that satisfies a specific data transfer quality between certain network devices is calculated in advance,
Create a correspondence table associating the obtained data transfer path information with a set of network devices as edge node devices located on the entry side and the exit side of the network,
The created correspondence table is transmitted in advance to the network device as the user device that is the issuing source of the connection request specifying the connection destination by the user,
The user equipment is
Holding the correspondence table received from the network management device;
When performing the connection request, the data transfer path information corresponding to the connection request is included in the connection request in the held correspondence table and transmitted to the network device as the edge node device located on the entry side of the network,
The edge node device is
Receiving the connection request from the user device ;
A path setting method in a network system, wherein path setting processing is performed for a network device on a data transfer path specified by the data transfer path information included in the received connection request .

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