JP2004304456A - Network system, path setting method in the same system, network management device to be used for the same system, and network device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promptly start the content distribution and communication by promptly completing path setting when a user makes a distribution request and a communication (connection) request of the contents. <P>SOLUTION: This network system is constituted so that a network management device 4 is provided with a path calculation part 411 which previously calculates the data transfer path information which satisfies a specific standard periodically or at the time of generation of a prescribed event and a correspondence table creation part 412 which creates a correspondence table in which the calculated data transfer path information is associated with the service contents and network devices 11, 2 or 3 are provided with data transfer request receiving parts 54 which receive data transfer requests and path setting processing parts 53 which perform path setting processing to corresponding data transfer paths of the previously created correspondence table when the data transfer requests are received by the data transfer request receiving parts 54. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technology for realizing a high-quality packet data transfer service on a packet network such as an IP (Internet Protocol) network. In particular, the present invention relates to high-speed path setting when providing a high-quality transfer path. The present invention relates to a technique suitable for:
[0002]
[Prior art]
In general, the route control in the current IP network is autonomously performed 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 method. In this case, in response to a communication request or a path setting request from a user, a path is calculated on the network management device side, and the calculated result is notified to a path setting unit of a node in the network to perform path setting. Alternatively, the network management device may directly set the path without using the path setting means of the node.
[0003]
For example, in the case of setting a path in an MPLS (Multi-Protocol Label Switching) network, in order to perform the path setting, the network management apparatus that has performed the route calculation notifies the passing node list to the MPLS router serving as the end point of the path. The MPLS router is notified from the network management node by using a path setting protocol such as a RSVP-TE (resource reservation protocol for traffic engineering) protocol or a CR-LDP (Constrained Routed Label Distribution Protocol) based on a path setting protocol notified from the network management apparatus. Execute the path setting.
[0004]
By the way, as an example of a service that currently provides a path to the user as described above, a path that maintains (guarantees) a certain communication quality in a content distribution service [CDN (Contents Delivery Network) service]. Provision of QoS (Quality of Service) path] is being considered.
Here, an example of a path setting in a conventional method when a content distribution service is assumed will be described with reference to FIG. In FIG. 27, reference numeral 100 denotes a content delivery network, 200 denotes a user device that receives a CDN service, 300 denotes a content server that provides a CDN service, and 400 denotes an NMS or the like that centrally manages route control in the content delivery network 100. Each represents a route control device, and 101 and 102 represent edge nodes that constitute the content delivery network 100, respectively.
[0005]
In this network system, first, when the user device 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]
Upon receiving the request, the path 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, band) 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 determines the starting point 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).
On the basis of the passing node list notified from the path control device 400, the edge node 102 sets a resource reservation protocol for RSVP-TE (Resource Reservation Protocol for Traffic Engineering) protocol or a CR-LDP (Constraint Routed Label Distribution using a path protocol such as a Protocol for setting a Protocol). Path setting for the delivery route (6).
[0008]
When the path setting is completed, the edge node 102 notifies the path control device 400 to that effect ([7]), and the path control device 400 notifies the content server 300 of the start of distribution ([8]). Thereby, the 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]
As a conventional technique, there is a technique (commodity purchase system) shown in Patent Document 1 below and a technique (stream distribution network service method and system) shown in Patent Document 2 below.
In the product purchase system described in Patent Literature 1, the product information distribution device stores the product information and the geographical route information transmitted from the store in the storage unit, and stores the information in the desired information transmitted from the transmission / reception terminal. On the other hand, store information suitable for purchase is selected from the stored information and transmitted to the transmitting / receiving terminal along with geographical route information to the store. This realizes a system in which the user of the transmission / reception terminal is shown a route to a store where a desired product can be purchased and guided to the store by a car navigation system or the like.
[0010]
On the other hand, in the system described in Patent Document 2, the client terminal selects a distribution network (best-effort distribution network or the like) most suitable for the request information of the stream content requested to be received, and distributes the stream content. From the plurality of candidates for the available stream distribution network, select the most suitable network for the content information, or set a distribution route, and request the stream distribution server to the client terminal. The content is distributed using the selected network or the set distribution route.
[0011]
[Patent Document 1]
JP 2001-357301 A
[Patent Document 2]
JP-A-2002-77257
[0012]
[Problems to be solved by the invention]
However, in the above-described path setting method, when a path setting request of a user is received by the network ingress node or the path control device, at least the path control device must establish an edge for the calculated route. The calculated route information (list of passing nodes) must be passed to the node.
[0013]
For this reason, a delay time corresponding to the path calculation time + the route information notification time is generated from when the user request is generated until the path setting (path setup) is actually started. That is, (1) when the route calculation is performed after receiving the request from the user, the path setting time is delayed by the route calculation time, and (2) when the route calculation is performed by the centralized control type device, the calculation result is stored in the node. The path setting time is delayed by the time notified to the side. Specifically, in the example described above with reference to FIG. 27, the processes of (2) to (5) correspond to the delay time until the service starts.
[0014]
Such a delay in path setting means that when a user requests content delivery, service start (content delivery start) for the user is delayed, which is a factor that hinders prompt service provision. In the above-mentioned Patent Documents 1 and 2, the selection of geographical route information, the selection of a distribution network, or the setting of a distribution route is performed only when a user requests it. It is clear that the above problem occurs.
[0015]
The present invention has been made in view of such problems, and when a user makes a content distribution request or a communication (connection) request, the path setting is completed quickly, and the content distribution and communication are quickly performed. The purpose is to be able to get started.
[0016]
[Means for Solving the Problems]
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 for the management device to periodically or when a predetermined event occurs, to previously calculate data transfer route information in the network that satisfies a specific criterion for service contents provided between certain network devices; A network device that includes a correspondence table creating unit that creates a correspondence table that associates the data transfer path information obtained by the calculation unit with the service content, and receives a data transfer request by the user in accordance with the service content, A data transfer request receiving unit for receiving the data transfer request; When the data transfer request is received by the transmission request receiving unit, it is specified by the data transfer path information corresponding to the data transfer request in the correspondence table created in advance by the correspondence table creation unit of the network management device. And a path setting processing unit for performing a path setting process for the data transfer path.
[0017]
Further, a path setting method in a network system according to the present invention (claim 2) is a method for setting a path 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 path information in the network that satisfies a specific criterion for service contents provided between certain network devices periodically or when a predetermined event occurs, and calculates the calculated data transfer. A network device that creates a correspondence table that associates the route information with the service content and receives a data transfer request from the user in accordance with the service content receives the data transfer request. The data transfer requirement of the correspondence table And characterized by performing path setting processing for the data transfer path which is specified by the data transfer path information corresponding to.
[0018]
Further, 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 route control in a network including a plurality of network devices. Or a predetermined event, when a predetermined event occurs, a route calculation unit that calculates in advance data transfer route information in the network that satisfies a specific criterion with respect to the service content provided between the first network device and the second network device. And a correspondence table creation unit that creates a correspondence table that associates the data transfer path information obtained by the path calculation unit with the service contents.
[0019]
A network device (claim 4) used in the network system of the present invention is 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. Data transfer path information in the network which satisfies a specific criterion for service contents provided between certain network devices periodically or when a predetermined event occurs. A routing table receiving unit that receives, from the network management device, a correspondence table created by associating the calculated data transfer path information and the service content with each other, and a data transfer request according to the service content by the user; Receive data transfer request Receiving the data transfer request at the data transfer request receiving unit, the data specified by the data transfer path information corresponding to the data transfer request in the correspondence table received by the routing table receiving unit A path setting processing unit for performing a path setting process for the transfer path is provided.
[0020]
Further, a path setting method in a network system according to the present invention (claim 5) is a method for setting a path 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 periodically or when a predetermined event occurs, calculates in advance data transfer path information in the network that satisfies a specific data transfer quality between certain network apparatuses, and obtains the calculated data transfer path information and A network device that creates a correspondence table that associates a set of network devices as edge nodes located on the ingress and egress sides of the network and receives a connection request specifying a connection destination by a user, Upon receipt, the correspondence table of the network management device And characterized by performing path setting processing for the data transfer path which is specified by the data transfer path information corresponding to the destination of the correspondence table is created in advance by the Department.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[A] Description of First Embodiment
FIG. 1 is a block diagram showing a configuration of a network system as a first embodiment of the present invention. The system shown in FIG. 1 includes a routing node (hereinafter, simply referred to as a “node”) 11 such as a plurality of routers. Network 1, a plurality of user devices (user terminals) 2, a plurality of content servers 3, and a network for centrally managing route control in the network 1 via a node (edge node) 11 closest to the network 1. It is provided with a management device (route control device) 4 and the like.
[0022]
Basically, the present network system is intended to provide a CDN service for delivering high-quality content such as movies and music, and the network 1 is a connection-oriented network such as MPLS. Nodes (relay nodes) 11 other than the edge nodes 11 among the nodes 11 constituting the network 1 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 a "network device".
[0023]
In such a system, even in the present embodiment, when a certain user device 2 issues a content distribution request, a network is required to distribute the requested content from the content server 3 that manages the requested content to the user device 2. In step 1, a delivery route (data transfer route) is determined and a path is set on the route. In the present embodiment, a quick 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 the present embodiment, as shown in FIG. 2, for example, the network management device 4 includes a route control unit 41 having functions as a route calculation unit 411, a correspondence table creation unit 412, and a correspondence table transmission unit 413, and a resource management unit. While the network device 11 is provided, the network devices 11, 2, and 3 mainly include a correspondence table receiving unit 51, a correspondence table memory 52, a path setting unit (request transmitting unit) 53, and a user request receiving unit (user request processing unit). 54, a packet analysis unit 55, and the like.
[0025]
Here, in the route control unit 41 of the network management device 4, the route calculation unit 411 periodically or when a predetermined event occurs (for example, when the load on the network management device 4 is small). A distribution route that satisfies a specific criterion (for example, a service quality such as a band and an allowable delay time) for contents provided between devices (for example, the edge node 11) is calculated and determined in advance. A known method may be applied to the pre-calculation of the delivery route (Pre-Computation method).
[0026]
The correspondence table creation unit 412 creates a correspondence table (table) in which specific content is associated with a calculated delivery route (data transfer route information) that is optimal for distributing the content. As shown in FIG. 3, a correspondence table 6 is created for each piece of content A, B, C, D,..., Which is associated with optimum calculated path information (passing node list). .
[0027]
Note that in FIG. 3, certain contents A and B exist in SERVER_1, the route of NODE_1 → NODE_2 → NODE_3 → NODE_4 is optimal as the distribution route of the content A, and the content C exists in another SERVER_2, The route from NODE_2 to NODE_5 is optimal as the distribution route for the content C. Similarly, the content D exists in another SERVER_3, and the route from NODE_2 to NODE_3 to NODE_4 is optimal as the distribution route for the content D. Means that.
[0028]
The correspondence table transmitting unit 413 transmits the correspondence table 6 created by the correspondence table creating unit 412 to the network device 11, 2, or 3, which receives a request message according to the content requested by the user. The resource management unit 42 manages resources such as a band to be allocated to a link on the network 1, and has a resource conflict 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 stores the correspondence table memory 52. The correspondence table 6 received at 51 is held.
The user request receiving unit (user request processing unit) 54 basically transmits a request message (a data transfer request such as a content distribution request or a connection request) issued by the user device 2 and responds to a request service of the user. ), But here, it also has the following functional units (1) to (3).
[0030]
(1) A correspondence table search function unit for searching and acquiring the passing node list corresponding to the request message in the correspondence table 6.
(2) The acquired passing node list is transferred (transmitted) to the path setting unit 53 for path setting or to another network device (for example, the edge node 11) included in the path setting request (or together with the path setting request). ) Pass-through node list transfer function (path setting request processing)
(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.
When the path setting unit (path setting processing unit) 53 receives the request message issued by the user device 2, the pass node corresponding to the request message in the correspondence table 6 stored in the correspondence table memory 52 A path setting process is performed for the delivery route specified by the list.
[0031]
Further, the packet analysis unit (Layer 7 packet identification function unit) 55 normally provides information of a layer 3 (IP layer) or higher that is identifiable at the edge node 11 of the user device 2 or the content server 3 [for example, This is implemented when it is necessary to capture the layer 7 (application layer) http message issued by the user device 2], whereby it is possible to capture the content distribution request sent as the http message. . Note that 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, as in the related art, each time the user device 2 issues a request message, the transmission / reception of the passing node list is performed between the network management device 4 and the network device 11, 12, or 3. Quick path setting can be performed without performing the setting.
Hereinafter, the path setting operation of the present embodiment will be described. The transmission destination of the correspondence table 6 may be four types of the user device 2, the edge node 11 on the user side, the edge node 11 on the content server 3 side, and the 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 for each of the above aspects will be described in detail.
[0033]
(A1) When transmitting the correspondence table 6 to the user device 2
First, a path setting method for transmitting the correspondence table 6 from the network management device 4 to the user device 2 will be described with reference to FIGS.
As shown in FIG. 4, a network management device (route control device) 4 periodically transmits individual contents provided by the network 1 to the edge node 11 (11A) on the user side in order to transfer the contents. (Or at the time of occurrence of a predetermined event), the route calculation unit 411 calculates a delivery route satisfying a specific service quality in advance.
[0034]
Then, the route control device 4 generates, by the correspondence table creation unit 412, a list of nodes through which the delivery route obtained by the route calculation passes in the network 1 (passing node list), and stores the content and the content. The content server 3 and the passing node list are associated with each other and stored in a memory or the like (not shown) as the correspondence table 6 described above with reference to FIG. 3 (step A1).
[0035]
Thereafter, the route 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 receiving unit 51, the user device 2 stores it in the correspondence table memory 52. I do.
When requesting distribution of a certain content, the user device 2 sends a request message (content distribution request) to the network 1. At this time, the user device 2 refers to the correspondence table 6 stored in the correspondence table memory 52, The pass-through node list corresponding to the requested content is searched and obtained, 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 a user accepts a request message on a WEB server (not shown), the http request message may include a passing node list.
[0036]
When the user request receiving unit 54 receives the request message (step B1 in FIGS. 5 and 6), the edge router 11A on the user side extracts a passing node list in the message (step B1 in FIGS. 5 and 6). B2) Based on the passing node list, an MPLS path is set (established) using predetermined path setting signaling (path setting message) (step A4, step B3 in FIGS. 5 and 6).
[0037]
At this time, it is necessary to set a path from the edge node 11 (11B) on the content server 3 side where the actual content (data) flows to the user side edge node 11A. For example, a GMPLS protocol is used as a path setting signaling protocol. It can be realized by using. The GMPLS (Generalized Multi-Protocol Label Switching) protocol is a protocol in which a bidirectional path can be set at one time.
[0038]
Thereafter, when the path setting is completed by the user-side edge node 11A receiving the path setting completion message (step A5, step B4 in FIGS. 5 and 6), the user-side edge node 11A sets the path to the route control device 4. (Steps B5 and B6 in FIGS. 5 and 6), and the route control device 4 notifies the content server 3 of the start of distribution (step A6). Accordingly, the content server 3 starts distributing the content to the user device 2 (Step A7).
[0039]
Note that the path setting completion notification from the user-side edge node 11A does not necessarily need to be sent to the content server 3 via the path control device 4. For example, the user side edge node 11A may directly notify the content server 3.
(A2) When transmitting the correspondence table 6 to the user-side edge node 11A
Next, the operation for transmitting the correspondence table 6 to the user-side edge node 11A will be described in detail with reference to FIGS.
[0040]
Also in the case of this example, as shown in FIG. 7, the path control device 4 periodically transmits the individual contents 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 a delivery route satisfying a specific service quality in advance, and the correspondence table creation unit 412 stores the delivery route obtained by the route calculation in the network 1. Generates a list of passing nodes (passing node list), and associates the content with the content server 3 and the passing node list in which the content is stored, as a correspondence table 6 described above with reference to FIG. ) (Step C1).
[0041]
After that, the route control device 4 transmits the created correspondence table 6 to the user-side edge node 11A (step C2). When the user-side edge node 11A receives the correspondence table 6, it stores it in the correspondence table memory 52.
When requesting a certain content (content distribution request), the user device 2 sends a request message including content information (for example, an ID attached to the content) to the user-side edge node 11A (step C3). . Also in this case, as described in the previous embodiment, it is conceivable that the request is made by the http request message.
[0042]
As shown in FIGS. 8 and 9, the user-side edge node 11A receives the packet from the user device 2 by the packet analysis unit 55 (step D1), and the packet analysis unit (layer 7 packet identification function unit) 55 , And identifies whether 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 previously sent from the route control device 4 and held in the correspondence table memory 52, and determines the route corresponding to the requested content. The passing node list is searched and acquired (route determination; step D3, step C4 in FIG. 7), and the passing 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 for a node in the passing node list received from the user request receiving unit 54 using predetermined path setting signaling (path setting message) (step in FIG. 7). C5). At this time, it is necessary to set a path from the content server side edge node 11B to the user side edge node 11A in which the content actually flows. In this case, too, the path is set by using, for example, the GMPLS protocol as a path setting signaling protocol. It is possible.
[0045]
Thereafter, as shown in FIGS. 8 and 9, the user-side edge node 11A (path setting unit 53) receives a 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 notice to the user request receiving unit 54 (step D6), and the user request receiving unit 54 issues a path setting completion notice 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 path control device 4 issues a distribution start notification to the content server 3 as shown in FIG. 7 (step C7), and receives the distribution start notification. The content server 3 starts distributing the content to the user device 2 (Step C8). Also in this case, the path setting completion notification does not necessarily need to be sent to the content server 3 via the route control device 4, but may be sent directly from the user-side edge node 11A to the content server 3. .
[0047]
(A3) When transmitting the correspondence table 6 to the content server side edge node 11B
Next, the operation for transmitting 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 path control device 4 periodically transmits individual contents provided by the network 1 to the edge node 11 (11A) on the user side in order to transfer the contents. (Or when a predetermined event occurs), the route calculation unit 411 calculates a delivery route satisfying a specific service quality in advance, and the correspondence table creation unit 412 stores the delivery route obtained by the route calculation in the network 1. Generates a list of passing nodes (passing node list), associates the content with the content server 3 and the passing node list in which the content is stored, and stores them in the correspondence table 6 described above with reference to FIG. ) (Step E1).
[0048]
Thereafter, the route control device 4 transmits the created correspondence table 6 to the content server-side edge node 11B (step E2). When the content server-side edge node 11B receives the correspondence table 6, it stores it in the correspondence table memory 52. I do.
Then, when requesting a certain content (content distribution request), the user device 2 sends a request message including content information (for example, an ID attached to the content) to the user side edge node 11A (step E3). . Also in this case, as described in the previous embodiment, it is conceivable that the request is made by the http request message.
[0049]
Here, since the destination of the http request message is the content server 3, the http request message finally passes through the immediately preceding content server side edge node 11B as shown in FIGS. Step F1). At this time, the content server-side edge node 11B uses the packet analysis unit (layer 7 packet identification function unit) 55 to determine whether the received message is a request message (content distribution request) to the content server 3, and If it is a message, the message is transferred to the request message processing (receiving) 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 stored in the correspondence table memory 52 in advance based on the content information. Then, it searches and acquires the passing node list of the route corresponding to the requested content (route determination; step F3, step E4 in FIG. 10).
[0051]
The acquired passing node list is passed to the path setting unit 53 (step F4), and based on the passing node list, the path setting unit 53 uses the predetermined path setting signaling 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). In this case, unlike the above-described example, at least a one-way path from the content server side edge node 11B to the user side edge node 11A may be set, and thus, 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 path 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 path control device 4 issues a distribution start notification to the content server 3 (step E7) and receives the distribution start notification. The content server 3 that has started the distribution of the content to the user device 2 (step E8). In this case as well, 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 transmitting the correspondence table 6 to the content server 3
Next, the operation for transmitting the correspondence table 6 to the content server 3 will be described in detail with reference to FIGS.
Also in the case of this example, as shown in FIG. 13, the path control device 4 periodically transmits individual contents provided by the network 1 to the user-side edge node 11 (11A). (Or when a predetermined event occurs), the route calculation unit 411 calculates a delivery route satisfying a specific service quality in advance, and the correspondence table creation unit 412 stores the delivery route obtained by the route calculation in the network 1. Generates a list of passing nodes (passing node list), associates the content with the content server 3 and the passing node list in which the content is stored, and stores them in the correspondence table 6 described above with reference to FIG. ) (Step G1).
[0055]
Thereafter, the route control device 4 transmits the created correspondence table 6 to the content server 3 (step G2). When the content server 3 receives the correspondence table 6, the content server 3 stores the correspondence table 6 in the correspondence table memory 52.
When requesting certain content (content distribution request), the user device 2 sends a request message addressed to the content server 3 including content information (for example, an ID attached to the content) to the user-side edge node 11A. (Step G3). Also in this case, as described in the previous embodiment, it is conceivable that the request is made by the http request message.
[0056]
As shown in FIGS. 14 and 15, when receiving the request message (step H1), the content server 3 extracts the content information in the received message by the user request receiving unit 54, and based on the information, With reference to the correspondence table 6 stored in the correspondence table memory 52, a passing node list of a route corresponding to the requested content is searched and obtained (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 by including it in the path setting request message (step H3, step G5 in FIG. 13). Upon receiving the passing node list, the content server side edge node 11B establishes an MPLS path from the content server side edge node 11B to the user side edge node 11A using predetermined path setting signaling based on the passing node list ( Step H4, Step G6 in FIG. 13). At this time, at least a one-way path may be set from the content server side edge node 11B to the user side edge node 11A. Therefore, in this case, for example, the RSVP-TE protocol may be applied as the path setting signaling protocol. it can. However, a bidirectional path may be set using the GMPLS protocol.
[0058]
After that, 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 (step H5), as shown in FIGS. A path setting completion notification is issued (step H6, step G7 in FIG. 13), and the path control device 4 issues a distribution start notification to the content server 3 by receiving the path setting completion notification as shown in FIG. (Step G8).
[0059]
Upon receiving the distribution start notification, the content server 3 starts distributing the content to the user device 2 (step G9). In this case as well, 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 the present embodiment, the route control device 4 performs route calculation in advance, creates a correspondence table 6, and transmits the correspondence table 6 to the network device. When a request message is received from the user, the message is received. The acquired network device acquires a passing node list corresponding to the requested content based on the correspondence table 6 transmitted in advance, and sets a path to the passing node 11 in the passing node list, The path setting is requested to the edge node 11.
[0061]
Therefore, upon receiving the user's request message, the path setting can be immediately performed based on the passing node list included in the request message or held by the edge node 11 without communicating with the route control device 4, and the request can be made. The time from reception to the start of content distribution can be greatly reduced.
[0062]
[B] Description of Second Embodiment
The above-described path setting method is applicable not only to the content distribution service but also to all data transfer services using a path such as a best effort service. For example, the present invention is applicable to a case where a file is transferred by setting a path between arbitrary user devices 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 set of edge nodes 11 to be transferred by the user and the route between the edge nodes 11 are associated with each other. The created correspondence table is created in the route control device 4 (route control unit 41).
That is, in this case, the path control device 4 (path control unit 41) calculates a path (for example, the shortest path) between specific edge nodes 11 in the network 1 that satisfies a specific quality in advance, for example, as shown in FIG. As shown in FIG. 16, a correspondence table in which a set of an incoming edge node 11 and an outgoing edge node 11 (address) is associated with a list of passing nodes 11 passing between the edge nodes 11 (passing node list). Create 6A.
[0064]
For example, in FIG. 16, between the ingress edge node EDGE_A and the egress edge node EDGE_B, the route of EDGE_A → CORE_1 → CORE_3 → EDGE_B is a route satisfying the reference quality, and the ingress edge node EDGE_A and the egress edge Between the node EDGE_C and the node EDGE_C, it means that the route of EDGE_A → CORE_1 → EDGE_C is a route satisfying the reference quality. Others are the same. Note that, in the present embodiment as well, a known method may be applied as a specific method of calculating the route between the edge nodes 11.
[0065]
Then, in the present embodiment, such a correspondence table 6A is transmitted from the route 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]
In this embodiment, the network devices such as the node 11 and the user device 2 have basically 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 stored in the correspondence table memory 52.
When the path setting unit 53 receives the request message (connection request) issued by the user device 2 (on the transmitting side), the path setting unit 53 uses the corresponding passing node list in the correspondence table 6A stored in the correspondence table memory 52. Path setting processing for the specified delivery route is performed.
[0067]
Further, in this case, the user request receiving unit (user request processing unit) 54 also provides (1) a correspondence table search function for searching / acquiring a passing node list corresponding to the request message issued by the user device 2 in the correspondence table 6A. And (2) a passing node list transfer function unit for transferring the obtained passing node list to the path setting unit 53 or another network device for path setting. However, unlike the first embodiment, (3) A) a path setting completion notification function unit that issues a path setting completion notification to the user device 2 on the transmitting side by receiving a notification of the path setting completion from the path setting unit 53;
[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 according to the difference of the transmission destination in 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 for transmitting the correspondence table 6A from the route 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 user device 2 on the transmission side of the request message (connection request) is issued by the transmission terminal 2S, the user device 2 on the reception side (connection destination) by the destination terminal 2R, and the user device 2S on the transmission side. The ingress edge node 11 that receives the request message at the entrance of the network 1 is called 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 called the receiving edge node 11R. It may be described.
[0070]
As illustrated in FIG. 17, the route control device 4 periodically (or when a predetermined event occurs) causes the route calculation unit 411 to select a data transfer route that satisfies a specific service quality between the edge nodes 11 on the network 1. A list of nodes through which the route obtained by the above route calculation passes in the network 1 (passing node list) is generated by the correspondence table creating unit 412 in advance, and the passing node list and the address of the ingress edge node 11 are generated. The correspondence table 6A described above with reference to FIG. 16 is created by associating the correspondence table with the address of the outgoing edge node 11, and the correspondence table 6A is stored 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 receiving unit 51, the transmission terminal 2S stores the correspondence table 6A in the correspondence table memory 52. Hold. Thereafter, the transmitting terminal 2S specifies a destination (destination terminal 2R) to communicate with and sends a connection request message to the network 1 side (step J3). At this time, the transmitting terminal 2S searches and acquires 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 stores the list in the connection request message. And sends it to the transmitting edge node 11S.
[0072]
Upon receiving (supplementing) the connection request message in the user request receiving unit 54 (step K1 in FIGS. 18 and 19), the transmitting-side edge node 11S extracts the passing node list in the message and sets 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 passing node list (step J4, step K3 in FIGS. 18 and 19).
[0073]
At this time, since a one-way path may be set at least from the transmitting edge node 11S to the receiving edge node 11R, 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 path setting is completed by the transmitting edge node 11S receiving the path setting completion message (step K4 in FIGS. 18 and 19), the transmitting edge node 11S notifies the transmitting 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 to the destination terminal 2R (step J6).
[0074]
Conversely, 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.
(B2) When transmitting the correspondence table 6A to the transmitting edge node 11S
Next, a path setting method for transmitting the correspondence table 6A from the route control device 4 to the transmitting-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 satisfying a specific service quality 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). The correspondence table 6A described above with reference to FIG. 16 is created by associating the address of the node 11 with the address of the outgoing edge node 11, and the correspondence table 6A is stored in a memory or the like (not shown) (step L1).
[0076]
Then, the route control device 4 transmits the created correspondence table 6A to the transmission-side edge node 11S (step L2), and the transmission-side edge node 11S receives the correspondence table 6A by the correspondence table receiving unit 51. It is stored in the table memory 52.
Thereafter, the transmitting terminal 2S specifies a destination (destination terminal 2R) to communicate with and sends a connection request message to the network 1 side (step L3). When the transmitting 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 receiving unit 54 (Step M1 in FIGS. 21 and 22), the transmitting side edge node 11S receives the message from the transmitting side edge node. 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 refers to the passing node list for the route corresponding to the set of addresses on the transmission side and the reception side. (Step M2 in FIGS. 21 and 22) and passes it to the path setting unit 53 (Step M3 in FIGS. 21 and 22).
[0078]
The path setting unit 53 sets an MPLS path using required path setting signaling based on the passing node list (step L4, step M4 in FIGS. 21 and 22). Also in this case, since a one-way path may be set from the transmitting edge node 11S to the receiving edge node 11R, as a path setting signaling protocol, for example, the RSVP-TE protocol can be applied, but the GMPLS protocol is used. A bidirectional path may be set.
[0079]
After that, when the path setting is completed by the transmitting side edge node 11S receiving the path setting completion message (step M5 in FIG. 21 and FIG. 22), the transmitting side edge node 11S transmits the user terminal 2S through the user request receiving unit 54. 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 to the destination terminal 2R (step L6).
[0080]
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 a route calculation in advance to create the correspondence table 6A and transmits the correspondence table 6A to the network device. Receives the passing node list according to the request based on the correspondence table 6A transmitted in advance, and sets a path to the passing node 11 in the passing node list, 11 is requested to set a path.
[0081]
Therefore, upon receiving the user's request message, the path setting can be immediately performed based on the passing node list included in the request message or held by the edge node 11 without communicating with the route control device 4, and the request can be made. The time from reception to the start of communication can be greatly reduced.
[C] Avoidance of resource contention when accepting requests
As described above, by performing the path setting of the present embodiment, it is possible to realize quick path setting. For example, when a request from a user is received and path setting is performed, securing of resources is performed. When doing so, there is a possibility that contention for resources (bands etc.) will occur.
[0082]
That is, the route control device 4 manages the reserved bandwidth for each link, and when securing a necessary portion at the time of setting a path, a request using the same link or route is sent from another location (node). When they occur at the same time, resource competition is expected to occur. For example, when a band exceeding a receivable band is requested for a certain link, any of the requests cannot be accepted (rejected. ).
[0083]
For example, as schematically shown in FIG. 23, in the route control device 4, the bandwidth “B” has already been reserved (reserved) for another request among the logical bandwidths for a certain link L, and can be accepted. In the state where the bandwidth is remaining “A”, requests for the required bandwidth = “C” and the required bandwidth = “D” (however, the bandwidth “A” <the bandwidth “C” + the bandwidth “D”) are simultaneously made. , Any request 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. The resource management unit 42 creates the correspondence table 6 or 6A by the correspondence table creation unit 412 and updates the corresponding route (link) by reducing the management band when transmitting the correspondence table 6 or 6A to the network device by the correspondence table transmission unit 413. Is what you do.
[0085]
For example, as schematically shown in FIG. 24, when the route control device 4 (route control unit 41) searches for a route satisfying a certain quality (bandwidth B1 Mbps) and finds a route R1 passing through the link L, The resource management unit 42 reserves the band B1 for the route R1 for 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 passing through the same link L, the resource management unit 42 To secure the band B2.
[0086]
That is, for the route to the created and transmitted correspondence table 6 or 6A, a band is reserved in advance before the user's request. This makes it possible to at least prevent resource contention when a request occurs at the same time.
[D] Other
Note that the present invention is not limited to the above-described embodiment, and can be implemented with various modifications without departing from the spirit of the present invention.
[0087]
For example, the correspondence table 6 used in the first embodiment associates the content possessed by the content server 3 with the calculated route (passing node list), but the route is not necessarily associated with the content. Not limited. For example, as shown below, it is also possible to associate an attribute value of the content or another index with a route.
[0088]
(D1) Correlation with content capacity (content size)
For example, for content having a particularly large file size or transfer data amount, it can be expected that the transfer delay time can be reduced by associating the content with a route having a margin in a band different from that of other content sizes. . For example, as shown in FIG. 25, the correspondence table 6B is created by dividing the corresponding paths according to the case where the content capacity is 1 MB or less, 10 MB or less, 50 MB or less, 50 MB or more, and the like. This makes it possible to set a path optimal for the content capacity at high speed in accordance with the content capacity requested by the user.
[0089]
(D2) Correlation with content and service types
For example, the quality required for a path differs between video streaming and file transfer such as software download. In video streaming, quality cannot be guaranteed unless a bandwidth of several Mbit / s is secured, but bandwidth is not necessarily guaranteed in file transfer. Therefore, more efficient transfer can be realized by dividing the route that passes according to the content type.
[0090]
For example, as shown in FIG. 26, a correspondence table 6C is created by dividing paths to be associated according to types such as video streaming, audio streaming, image files, and text files. At this time, the content type is displayed using an identifier or the like indicating the content type. This makes it possible to quickly set an optimal path for the type according to the type of content or service requested by the user.
[0091]
[E] Additional notes
(Supplementary Note 1) A network comprising a plurality of network devices,
A network management device that centrally manages route control in the network;
The network management device is
Periodically, or at the time of occurrence of a predetermined event, a path calculation unit that calculates in advance data transfer path information in the network that satisfies a specific criterion for service contents provided between certain network devices,
A correspondence table creating unit that creates a correspondence table that associates the data transfer path information obtained by the path calculation unit with the service content;
A network device that receives a data transfer request according to the service content by the user,
A data transfer request receiving unit that receives the data transfer request;
When the data transfer request is received by the data transfer request receiving unit, the data transfer request is received by the data transfer path information corresponding to the data transfer request in the correspondence table created in advance by the correspondence table creation unit of the network management device. A network system comprising a path setting processing unit for performing a path setting process for a specified data transfer path.
[0092]
(Supplementary Note 2) 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 is
Periodically, or when a predetermined event occurs, previously calculate data transfer path information in the network that satisfies a specific criterion for service contents provided between certain network devices,
Create a correspondence table that associates the requested data transfer path information with the service content,
A network device that receives a data transfer request according to the service content by the user,
Upon receiving the data transfer request, the network management device performs a path setting process for a data transfer path specified by the data transfer path information corresponding to the data transfer request in the correspondence table created in advance. 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 a user device from which the data transfer request is issued,
The user apparatus transmits the data transfer request to another network apparatus as a user apparatus side edge node apparatus located at the entrance of the network and the data corresponding to the data transfer request in the correspondence table received from the network management apparatus. Send transfer path information and
3. The network system according to claim 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 device. Path setting method in.
[0094]
(Supplementary Note 4) The network management device sends the data transfer request from the network device as the user device that is the 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. 3. A path setting method in a network system according to claim 2, wherein a path setting process is performed for a network device on a route.
[0095]
(Supplementary Note 5) The network management device is configured to provide data corresponding to the service content from a network device serving as a service providing device to a network device serving as a service providing device-side edge node device that receives the data at an 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, the edge node device is identified by the data transfer path information corresponding to the data transfer request in the correspondence table received from the network management device. 2. A path setting method in a network system according to claim 2, wherein a path setting process 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 as a service providing device that provides data corresponding to the service content,
When the service providing device receives the data transfer request issued by the network device as the user device that is the source of the data transfer request, the service providing device responds to the data transfer request in the correspondence table received from the network management device. Transmitting the data transfer path information to a network device as a service providing device-side edge node device that receives data corresponding to the service content from the service providing device at an entrance of the network;
3. The network according to claim 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 device. Path setting method in the system.
[0097]
(Supplementary Note 7) A network management device used for a network system, which centrally manages route control in a network including a plurality of network devices,
A route calculation for calculating data transfer route information in a network that satisfies a specific criterion for service contents provided between a first network device and a second network device periodically or when a predetermined event occurs. Department and
A network management device for use in a network system, comprising: a correspondence table creating unit that creates a correspondence table that associates the data transfer path information obtained by the path calculation unit with the service contents.
[0098]
(Supplementary Note 8) A correspondence table transmitting unit that transmits 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 from a user is further provided. And a network management device used in the network system according to supplementary note 7.
(Supplementary note 9) The network system according to supplementary note 7 or 8, further comprising a resource management unit that secures resources 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) The 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, periodically or when a predetermined event occurs, data transfer path information in the network that satisfies a specific criterion for service contents provided between certain network devices is calculated in advance, and the obtained data is calculated. A routing table receiving unit that receives a correspondence table created by associating transfer path information with the service content from the network management device;
A data transfer request receiving unit that receives a data transfer request according to the service content by the user;
When the data transfer request is received by the data transfer request receiving unit, the path to the data transfer path specified by the data transfer path information corresponding to the data transfer request in the correspondence table received by the routing table receiving unit A network device used in a network system, comprising a path setting processing unit for performing a setting process.
[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 routing table receiving unit 11. The network device used in the network system according to supplementary note 10, further comprising a path setting request processing unit for making 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 section, the data transfer path information corresponding to the data transfer request in the correspondence table received by the routing table receiving section is specified by the data transfer path information. 11. A network device used in the network system according to claim 10, further comprising a path setting request processing unit for transmitting a path setting request to another network device on a data transfer path to be performed.
[0101]
(Supplementary Note 13) A network including a plurality of network devices,
A network management device that centrally manages route control in the network;
The network management device is
Periodically, or at the time of occurrence of a predetermined event, a route calculation unit that calculates in advance data transfer route information in the network that satisfies a specific data transfer quality between certain network devices,
A correspondence table creation unit for creating a correspondence table that associates the data transfer path information obtained by the path calculation unit with a set of network devices as edge nodes located on the ingress and egress sides of the network; ,
A network device that receives a connection request specifying a connection destination by a user,
A connection request receiving unit that receives the connection request;
When the connection request is received by the connection request receiving unit, the connection request is specified by the data transfer path information corresponding to the connection destination in the correspondence table created in advance by the correspondence table creating unit of the network management device. A network device used in a network system, comprising a path setting processing unit for performing a path setting process for a data transfer path.
[0102]
(Supplementary Note 14) A network including a plurality of network devices,
A network management device that centrally manages route control in the network;
The network management device is
Periodically, or when a predetermined event occurs, calculate in advance data transfer path information in the network that satisfies a specific data transfer quality between certain network devices,
Create a correspondence table that associates the determined data transfer path information with a set of network devices as edge nodes located on the ingress and egress sides of the network,
A network device that receives a connection request specifying a connection destination by a user,
When the connection request is received, a path setting process for a data transfer path specified by the data transfer path information corresponding to the connection destination in 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.
[0103]
(Supplementary Note 15) The network management device transmits the correspondence table to a network device as a user device that is a source of the connection request,
The user device transmits the connection request to another network device as the ingress edge node located at the entrance of the network and the data transfer path information corresponding to the connection destination in the correspondence table received from the network management device. And send
The network system according to claim 14, wherein the ingress edge node performs a path setting process for another network device on a data transfer path specified by the data transfer path information received from the user apparatus. Path setting method in.
[0104]
(Supplementary Note 16) The network management device transmits the correspondence table from a network device as a user device that is a source of the connection request to a network device as an incoming edge node that receives the connection request at an entrance of the network. And
When the ingress edge node receives the connection request from the user device, the ingress edge node receives another request 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 device. 14. The path setting method in a network system according to claim 14, wherein a path setting process is performed for the network device.
[0105]
(Supplementary Note 17) A network management device used in a network system that centrally manages route control in a network including a plurality of network devices,
Periodically, or at the time of occurrence of a predetermined event, a route calculation unit that calculates in advance data transfer route information in the network that satisfies a specific data transfer quality between certain network devices,
A correspondence table creation unit for creating 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 ingress and egress sides of the network. A network management device used for 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 from a user. Network management device used for the system.
(Supplementary note 19) The network system according to Supplementary note 17 or 18, further comprising a resource management unit that secures resources to be 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) The 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 apparatus, periodically or when a predetermined event occurs, data transfer path information in the network satisfying a specific data transfer quality between certain network apparatuses is calculated in advance, and the obtained data transfer path information is calculated. And a routing table receiving unit that receives, from the network management device, a correspondence table created in association with a set of network devices as edge nodes located on the ingress and egress sides of the network,
A connection request receiving unit that receives a connection request specifying a connection destination by a user,
When the connection request is received by the connection request receiving unit, a path setting process for a 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 used for a network system, comprising a path setting processing unit for performing the setting.
[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 routing table receiving unit 20. A network device used in the network system according to claim 19, further comprising a path setting request processing unit for making 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 receiving unit, the data transfer path information corresponding to the connection destination in the correspondence table received by the path table receiving unit is converted into data specified by the data transfer path information. A network device used in a network system, comprising a path setting request processing unit for transmitting a path setting request to another network device on a transfer path.
[0110]
【The invention's effect】
As described in detail above, according to the present invention, a network management device calculates data transfer path information that satisfies a specific criterion in advance between certain network devices periodically or when a predetermined event occurs, A correspondence table that associates the obtained data transfer path information with the service content is created, and when the network device receives the data transfer request, the network device receives the data transfer request from the correspondence table created in advance by the network management device. Since a path setting process is performed for the data transfer path specified by the corresponding data transfer path information, when a user's data transfer request is received, the passing node list held by the network device is not communicated with the network management device. Path can be set immediately on the basis of the It can be shortened to.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a network system according to a first embodiment of the present invention.
FIG. 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. 3 is a diagram illustrating an example of a correspondence table according to the first embodiment.
FIG. 4 is a diagram for explaining an operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to a user device);
FIG. 5 is a diagram for explaining an operation of the network system shown in FIG. 1 (when a correspondence table is transmitted to a user device);
FIG. 6 is a flowchart for explaining the operation of the network system shown in FIG. 1 (when transmitting a correspondence table to a user device);
FIG. 7 is a diagram for explaining an 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 transmitting a correspondence table 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 a content server-side edge node).
11 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-side edge node).
FIG. 12 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-side edge node).
FIG. 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 an operation of the network system shown in FIG. 1 (when transmitting a correspondence table to a content server);
FIG. 15 is a flowchart for explaining the operation of the network system shown in FIG. 1 (when transmitting a correspondence table to a content server);
FIG. 16 is a diagram illustrating an example of a correspondence table according to the second embodiment of the present invention.
FIG. 17 is a diagram for explaining an 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 transmitting a correspondence table to a transmission terminal).
FIG. 19 is a flowchart for explaining the operation of the network system of the second embodiment (when transmitting a correspondence table to a transmitting 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 transmitting 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 transmitting edge node).
FIG. 22 is a flowchart illustrating an operation of the network system according to the second embodiment (when a correspondence table is transmitted to a transmitting edge node).
FIG. 23 is a schematic diagram for explaining a conflict phenomenon by a conventional resource management method.
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 tables shown in FIGS. 3 and 16;
FIG. 26 is a diagram showing another example of the correspondence tables shown in FIGS. 3 and 16;
FIG. 27 is a diagram for describing an example of path setting in a conventional method.
[Explanation of symbols]
1 Network
2 User equipment (network equipment)
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 transmission unit
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 unit (request sending unit)
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 route control in the network;
The network management device is
Periodically, or at the time of occurrence of a predetermined event, a path calculation unit that calculates in advance data transfer path information in the network that satisfies a specific criterion for service contents provided between certain network devices,
A correspondence table creating unit that creates a correspondence table that associates the data transfer path information obtained by the path calculation unit with the service content;
A network device that receives a data transfer request according to the service content by the user,
A data transfer request receiving unit that receives the data transfer request;
When the data transfer request is received by the data transfer request receiving unit, the data transfer request is received by the data transfer path information corresponding to the data transfer request in the correspondence table created in advance by the correspondence table creation unit of the network management device. A network system comprising a path setting processing unit for performing a path setting process for a specified data transfer path. 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 is
Periodically, or when a predetermined event occurs, previously calculate data transfer path information in the network that satisfies a specific criterion for service contents provided between certain network devices,
Create a correspondence table that associates the requested data transfer path information with the service content,
A network device that receives a data transfer request according to the service content by the user,
Upon receiving the data transfer request, the network management device performs a path setting process for a data transfer path specified by the data transfer path information corresponding to the data transfer request in the correspondence table created in advance. A path setting method in a network system. A network management device used for a network system, which centrally manages route control in a network including a plurality of network devices,
A route calculation for calculating data transfer route information in a network that satisfies a specific criterion for service contents provided between a first network device and a second network device periodically or when a predetermined event occurs. Department and
A network management device for use in a network system, comprising: a correspondence table creating unit that creates a correspondence table that associates the data transfer path information obtained by the path calculation unit with the service contents. A network device for use 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, periodically or when a predetermined event occurs, data transfer path information in the network that satisfies a specific criterion for service contents provided between certain network devices is calculated in advance, and the obtained data is calculated. A routing table receiving unit that receives a correspondence table created by associating transfer path information with the service content from the network management device;
A data transfer request receiving unit that receives a data transfer request according to the service content by the user;
When the data transfer request is received by the data transfer request receiving unit, the path to the data transfer path specified by the data transfer path information corresponding to the data transfer request in the correspondence table received by the routing table receiving unit A network device used in a network system, comprising a path setting processing unit for performing a setting process. A network comprising a plurality of network devices;
In a network system including a network management device that centrally manages route control in the network,
The network management device is
Periodically, or when a predetermined event occurs, calculate in advance data transfer path information in the network that satisfies a specific data transfer quality between certain network devices,
Create a correspondence table that associates the determined data transfer path information with a set of network devices as edge nodes located on the ingress and egress sides of the network,
A network device that receives a connection request specifying a connection destination by a user,
When the connection request is received, a path setting process for a data transfer path specified by the data transfer path information corresponding to the connection destination in 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.

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