JP2005277714A - Band securing method for lsp design server system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems that, when a standby which can be secured from a server system for managing the design of an LSP in an integrated manner is calculated to a router, which is capable of setting a WRR ratio as priority control between AF classes and does not permit zero designation to the WRR ratio at the time of the setting, it is necessary to set a minimum value of the WRR ratio permitted by the router even if an unused AF class exists, and consequently, a wasteful band is secured. <P>SOLUTION: The minimum value of the WRR ratio is set in the provisioning to the actual router for the router which intrinsically can not execute the zero designation to the WRR ratio. However, the minimum value is calculated as zero at the stage of the design. The accommodation efficiency of the LSP is improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention is Diff-serv (Differentiated Services) over
The present invention relates to an LSP design server system that centrally manages LSP design in the provision of an MPLS (Multiprotocol Label Switching) service, and more particularly to a bandwidth securing method for an LSP design server system that efficiently secures the bandwidth.

LSP (Label Switched Path) is information such as name, internal network address, node address as router information, cost, packet size, media information as link information, file service as service information, NSD (Netware
Directory Service), information such as time synchronization information, and RIP / SAP network information as external routes.

Such technical fields, particularly weighted round robin
Robin, hereinafter referred to simply as “WRR”), and related art relating to a system using the WRR technology are disclosed in various documents. ATM switch (Asynchronous
Disclosed is a buffer avoidance system and method in a buffer that prevents as much as possible the discarding of cells staying in the QoS buffer when traffic of a specific QoS (Quality of Service) class in the Transfer Mode Switching System increases (for example, , See Patent Document 1). In addition, a router device capable of separating queues at an arbitrary granularity and flexibly guaranteeing and separating traffic and a priority control method used therefor are disclosed (for example, refer to Patent Document 2).

Japanese Patent Laid-Open No. 2001-156785 (page 5, FIG. 1) Japanese Patent Laid-Open No. 2002-44139 (page 4, FIG. 1)

  FIG. 5 shows a system configuration diagram of a general conventional LSP design server system. The LSP design server system 100 includes a screen control unit 110, a database unit 120, and a design unit 130. The design unit 130 of the LSP design server system 100 is connected to a plurality of routers such as the router A 160 and the router B 170 via an IP (Internet Protocol) 150. The screen control unit 110 displays a WRR setting ratio input unit 111, an LSP setting reference input unit 112, and the like as illustrated.

  However, the conventional LSP design server system has several problems. First, since 0 in the WRR input by the input unit 111 of the WRR setting ratio in the screen control unit 110 is not allowed, the LSP accommodation design of the AF class intended by the operator is impossible. In addition, since the design unit 130 does not have a function for calculating LSP accommodation with a WRR setting ratio of 0, it is impossible to perform efficient LSP accommodation design considering an unused AF class. I can't meet.

  The present invention has been made in view of the above-described problems of the prior art, and uses WRR for priority control between AF (Assured Forwarding) classes in an LSP design server system that centrally manages LSP design. In addition, an object of the present invention is to provide a bandwidth securing method of an LSP design server system that targets a router that does not allow a WRR setting ratio of 0 and that efficiently secures bandwidth when designing an LSP.

  In order to solve the above-described problem, the LSP design server system bandwidth securing method according to the present invention employs the following characteristic configuration.

(1) Connected to a router via an IP network and connected to the design unit that provides the provisioning function of the router, the screen control unit that is connected to the design unit and inputs the WRR setting ratio and the LSP setting standard, and the design unit In the method of securing the bandwidth of the LSP design server system including the database unit that accumulates and enables reference to the set WRR setting ratio and the LSP setting bandwidth,
In response to the WRR setting request, the LSP setting request, and the current setting value acquisition request, it is determined whether or not the LSP can be accommodated, and the unused AF class calculates the bandwidth by setting the WRR setting ratio to 0. Bandwidth securing method for server system.

  (2) The bandwidth securing method for the LSP design server system according to (1), wherein the result (success or failure) of the LSP accommodation determination is displayed on the screen control unit.

  (3) The bandwidth of the LSP design server system according to (1) or (2) above, in which, when the LSP accommodation is possible, the LSP to the database unit is set and provisioning to the router is performed. How to secure.

  (4) The bandwidth securing method for the LSP design server system according to (3), wherein when the provisioning to the router is completed, a successful LSP setting is displayed on the screen control unit.

  (5) The number (N) of relay routers between the Ingress router and the Egress router in the LSP can be changed, and the WRR ratio and LSP provisioning can be performed for each router (1) To (4) A bandwidth securing method for any LSP design server system.

(6) A method for comprehensively managing the resources of each router existing in the IP network and instructing LSP design,
The screen controller provides a man-machine interface that specifies the WRR ratio for each router and the class and bandwidth specification at the time of LSP design.
The design unit sets the WRR ratio between the AF classes requested by the screen control unit in the previous period in the database unit, and at the same time, provisions the corresponding router. At this time, the database relating to the AF class requested as the WRR ratio 0 A bandwidth securing method for an LSP design server system in which a WRR ratio 0 is set for a part and a minimum WRR ratio is provisioned for a target router.

  (7) In response to the LSP design instruction requested from the screen control unit, the design unit obtains the free bandwidth information of the request class in each router from the database unit, determines whether it can be set, and sets If possible, the bandwidth securing method for the LSP design server system according to (6) above, wherein an LSP is set for the database unit and provisioned to the corresponding router.

  According to the bandwidth securing method of the LSP design server system of the present invention, the following significant effects can be obtained. That is, since the LSP accommodation calculation is performed after distinguishing the internal data and the actual router setting value in the WRR setting ratio, it is possible to improve the LSP accommodation rate. In addition, since the screen control unit can know whether or not the LSP reaches the maximum capacity, it is possible to avoid the influence on traffic due to over-provisioning (that is, packet loss and the like). Furthermore, since it does not depend on the number of routers when setting the LSP, scalability on the network scale can be obtained.

  Hereinafter, the configuration and operation of a preferred embodiment of a bandwidth securing method for an LSP design server system according to the present invention will be described in detail with reference to the accompanying drawings.

  First, FIG. 1 shows an overall system configuration diagram of an LSP design server system to which a bandwidth securing method for an LSP design server system according to the present invention is applied and an IP network connected thereto. In this specific example, the LSP design server system 10 includes a screen control unit 20, a database unit 30, and a design unit 40. The design unit 40 is connected to the IP network 50 including the router A61, the router B62, and the router C63. Then, the LSP design server system 10 comprehensively manages the resources (resources) of the routers 61 to 63 existing in the IP network 50, and issues an LSP design instruction.

  The screen control unit 20 provides a man-machine interface for specifying the WRR ratio for each of the routers 61 to 63, specifying the class and bandwidth at the time of LSP design, and notifies the design unit 40 of the information. The design unit 40 sets the WRR ratio between AF classes requested by the screen control unit 20 in the database unit 30 and at the same time provisions the routers 61 to 63. At that time, for the AF class requested as the WRR ratio 0, the WRR ratio 0 is set to the database unit 30. On the other hand, the minimum value of the WRR ratio is provisioned for the target routers 61 to 63. In response to the LSP design instruction requested from the screen control unit 20, the design unit 40 acquires the free bandwidth information of the request class in each router 61 to 63 from the database unit 30 and determines whether or not the setting is possible. . If it can be set, the LSP is set for the database unit 30, and at the same time, the routers 61 to 63 are provisioned.

  As described above, in the LSP design server system 10 of the present invention, the provision to the actual router is set to the minimum value of the WRR ratio for the routers 61 to 63 that cannot originally be designated as 0 in the WRR ratio. Therefore, it is possible to improve the LSP accommodation efficiency.

  Next, FIG. 2 is a detailed functional block diagram of a preferred embodiment of the bandwidth securing method of the LSP design server system according to the present invention. In the LSP design server system 10 shown in FIG. 2, the screen control unit 20 includes a WRR setting ratio input unit 21 and an LSP setting band input unit 22 as man-machine interfaces.

  The design unit 40 has a setting function for the database unit 30 and a provisioning function for the routers 61 and 62 in response to the WRR ratio setting request from the screen control unit 20. In response to the LSP setting request from the screen control unit 20, the design unit 40 acquires the current setting value from the database unit 30 and determines whether LSP setting is possible. Thereafter, if the LSP setting is possible, the setting to the database unit 30 and the provisioning to the routers 61 and 62 are performed.

  On the other hand, the database unit 30 accumulates the WRR setting ratio and the LSP setting band set by the design unit 40 so that they can be referred to. Each router 61, 62 enables provision of a WRR ratio and LSP according to an instruction requested from the design unit 40.

  The detailed configuration of the embodiment of the bandwidth securing method of the LSP design server system according to the present invention has been described above. However, since the routers 61 and 62 in FIG. 2 are well known to those skilled in the art and are not directly related to the present invention, their detailed configurations are omitted.

  Next, the operation of the bandwidth securing method of the LSP design server system according to the preferred embodiment of the present invention will be described in detail with reference to the timing chart shown in FIG.

First, in step S1, a WRR ratio setting request is given from the screen control unit 20 to the design unit 40. Then, the design unit 40 sets the WRR ratio setting in the database unit 30. At the same time, the routers 61 and 62 are provisioned. In the case of FIG. 2, both the router A61 and the router B62 are “AF4: AF3: AF2: AF1 = 7: 3: 0: 0”.
Provision as.

  Next, in step S <b> 2, an LSP setting request instruction is given from the screen control unit 20 to the design unit 40. Therefore, the design unit 40 makes a current setting value acquisition request to the database unit 30 in order to obtain the LSP bandwidth upper limit value according to the WRR ratio of each AF class (step S3).

Next, based on the value acquired in step S3, it is determined whether or not LSP accommodation is possible (step S4). In the case of FIG. 2, the WRR setting ratio for a physical link line with a total bandwidth of 100 Mbps is
“AF4: AF3: AF2: AF1 = 7: 3: 0: 0”
Therefore, the actual bandwidth that can be set for each AF class is as follows. That is,
AF4 = 100Mbps × 7/10 = 70Mbps
AF3 = 100Mbps × 3/10 = 30Mbps
AF2 = 100Mbps × 0/10 = 0Mbps
AF1 = 100Mbps × 0/10 = 0Mbps
Thus, the LSP setting bandwidth requested by the operator can be satisfied.

Next, when the result of the determination in step S4 is that the LSP can be accommodated (step S4: Yes), the process proceeds to step S5 and the LSP is set in the database unit 30 (step S5). In the case of FIG. 2, as the LSP set bandwidth, both the router A61 and the router B62 are
“AF4: AF3: AF2: AF1 = 70 Mbps: 30 Mbps: 0 Mbps: 0 Mbps”
Set.

Subsequently, provisioning to the router is performed in step S6. As in step S5, both routers A and B
“AF4: AF3: AF2: AF1 = 70 Mbps: 30 Mbps: 0 Mbps: 0 Mbps”
Provision. Thereafter, in step S7, an LSP setting response (success) is sent to the screen controller 20, and the operation is terminated.

  On the other hand, if the result of step S4 described above indicates that the LSP cannot be accommodated (step S4: No), the process proceeds to step S8, an LSP setting response (failure) is made to the screen control unit 20, and the operation is performed. finish.

  Next, a second embodiment of the LSP design server system according to the present invention will be described with reference to FIG. The basic configuration of this LSP design server system is the same as that of the first embodiment described above. Accordingly, like reference numerals are used for corresponding components for convenience.

  However, the second embodiment is different from the first embodiment in the setting point of the LSP. That is, as shown in FIG. 4, the LSP to be set manages the end-to-end setting. If the ingress router in the corresponding LSP is router A, the egress router is router B, and there is router n as its relay router, the number of relay routers can be changed to N routers. Ratio and LSP provisioning is possible.

  Thus, in the LSP design server system of the second embodiment, scalability on the network scale can be obtained because it does not depend on the number of routers when setting the LSP.

In order to clarify the difference between the LSP design server system of the present invention described above and the conventional LSP design server system as shown in FIG. As described above, in the conventional LSP design server system, since WRR of 0 in the screen control unit is not allowed, the WSP setting ratio for the physical link line with the LSP total bandwidth of 100 Mbps is different from the case of the present invention described above.
“AF4: AF3: AF2: AF1 = 7: 3: 1: 1”
It becomes. Therefore, the actual bandwidth that can be set for each AF class is as follows.
AF4 = 100Mbps × 7/12 = 58.3Mbps
AF3 = 100Mbps × 3/12 = 25Mbps
AF2 = 100Mbps × 1/12 = 8.3Mbps
AF1 = 100Mbps × 1/12 = 8.3Mbps
Therefore, unlike the case of the present invention described above, the LSP setting bandwidths of 70 Mbps and 30 Mbps requested by the operator as AF4 and AF3 cannot be satisfied.

  The configuration and operation of the preferred embodiment of the bandwidth securing method for the LSP design server system according to the present invention have been described in detail above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention.

1 is a system configuration diagram showing an overall configuration of a bandwidth securing method for an LSP design server system according to the present invention. FIG. It is a figure which shows the structure of 1st Example of the band ensuring method of the LSP design server system by this invention. 3 is a flowchart for explaining the operation of the bandwidth securing method of the LSP design server system according to the present invention shown in FIG. It is a figure which shows the structure of 2nd Example of the band ensuring method of the LSP design server system by this invention. It is a figure which shows the structure of the conventional LSP design server system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 LSP design server system 20 Screen control part 21 WRR setting ratio input part 22 LSP setting standard input part 30 Database 40 Design part 50 IP network 61-63 Router

Claims (7)

Connected to the router via the IP network, the design unit providing the provisioning function of the router, the screen control unit connected to the design unit and inputting the WRR setting ratio and the LSP setting standard, and the design unit connected to the design unit In the LSP design server system bandwidth securing method including the database unit that accumulates and can be referred to by the WRR setting ratio and the LSP setting bandwidth,
In response to the WRR setting request, the LSP setting request, and the current setting value acquisition request, it is determined whether or not the LSP can be accommodated, and the bandwidth calculation is performed with the WRR setting ratio set to 0 for an unused AF class. A bandwidth securing method for an LSP design server system, which is characterized.   2. The bandwidth securing method for an LSP design server system according to claim 1, wherein a result (success or failure) of the LSP accommodation availability determination is displayed on the screen control unit.   3. The LSP design server system according to claim 1, wherein, as a result of the determination as to whether or not LSP can be accommodated, if the LSP can be accommodated, an LSP for the database unit is set and provisioning to the router is performed. Bandwidth securing method.   4. The LSP design server system bandwidth securing method according to claim 3, wherein when the provisioning to the router is completed, LSP setting success is displayed on the screen control unit.   The number of relay routers (N) between an ingress router and an egress router in the LSP can be changed, and a WRR ratio and LSP provisioning can be made for each router. A bandwidth securing method for an LSP design server system according to any one of 1 to 4. A method for comprehensively managing the resources of each router existing in an IP network and instructing LSP design,
The screen controller provides a man-machine interface that specifies the WRR ratio for each router and the class and bandwidth specification at the time of LSP design.
The design unit sets the WRR ratio between the AF classes requested by the screen control unit in the previous period in the database unit, and at the same time, provisions the corresponding router. A bandwidth securing method for an LSP design server system, wherein a WRR ratio 0 is set for a part of a router and a minimum WRR ratio is provisioned for a target router. In response to the LSP design instruction requested from the screen control unit, the design unit obtains the free bandwidth information of the request class in each router from the database unit, determines whether or not the request class can be set, and can be set. 7. The method for securing a bandwidth of an LSP design server system according to claim 6, wherein an LSP is set for the database unit and provisioned to the corresponding router.

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