JP2005341137A - Method, apparatus, and program for deciding setting permission of multicast transfer path and storage medium for storing the program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of determining a range of links being arithmetic objects when a plurality of end points exist and attaining admission control in multicast communication. <P>SOLUTION: This method includes the steps of: detecting links through which a path passes; acquiring information of a band having already been used in bands usable by traffic by a link and a band of a path going to be set from now; calculating a utility rate by dividing the band by a maximum band usable for the traffic; using a value for metric resulting from a power calculation taking a given arbitrary number with respect to the utility rate as an exponent; and admitting the setting of the path when the total sum of the metrics of the links included in the path is less than an upper limit given beforehand. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multicast transfer route setting permission determination method and apparatus, a program, and a storage medium storing the program, and more particularly, among routes connecting an information distribution source start point and an information distribution destination end point. Multicast transfer to avoid the influence of packet loss, bandwidth occupancy, etc., on other traffic in the multicast communication in which information is copied and transferred to each end point at the node where the route is divided The present invention relates to a route setting permission determination method and apparatus, a program, and a storage medium storing the program.

  Currently, services using video and audio such as video conferencing and streaming services are attracting attention. Data such as moving images and audio has a problem that the moving image quality deteriorates during reproduction due to delay and packet loss in the network. In particular, streaming is characterized by providing data to a specific large number of people. However, if such a service uses existing unicast communication, which is one-to-one communication, data corresponding to the number of users can be obtained. A large amount of traffic will be generated.

  Multicast MPLS technology is attracting attention as a technology for solving both. With this technology, the amount of bandwidth used by the data passing through the route can be explicitly specified, and, similar to the IP multicast technology, it can be copied to the user by copying packets for the number of routes existing downstream in the router. And deliver data. This eliminates problems such as packet loss and prevents waste of network resources.

  Next, consider network providers that implement these services. In general, stress and the like felt by the user can be reduced by preventing data quality deterioration, increase in data transfer delay, and failure such as download. Therefore, in order to satisfy many customers, it is important to accommodate as much traffic as possible and transfer each packet with little packet loss. As a technique for realizing this problem, there is a technique called admission control that increases the number of accommodated traffic such as other traffic with good behavior by prohibiting the setting of a route through which traffic with poor behavior or traffic with poor accommodation efficiency flows. Admission control detects traffic behavior and the state of the link through the route to be set, prohibits delivery of bad traffic, and prohibits delivery of traffic that consumes a large amount of bandwidth. I do.

  In the present invention, this time, the latter determination method regarding delivery prohibition is defined.

  As a method of admission control in unicast communication, route setting is permitted when the sum of the metrics calculated from the link utilization rate included in the route between the start point and end point of the route falls below a given value. To do. Here, it is assumed that the link utilization rate is a value obtained by adding the bandwidth of the route to be set to the bandwidth of the route currently set on the link and dividing the value by the maximum bandwidth of the link.

In the first method, a value obtained by multiplying a link utilization factor μ by a given number (k), that is, μ ^k is used as a metric of the link (see, for example, Non-Patent Document 1).

  In the second method, the link utilization factor μ is a power of an arbitrary number (k), that is, kμ is used as a metric (for example, see Non-Patent Document 2). The route setting permission standard is as follows.

  For the first method,

第２の方法の場合は、

For the second method,

ここで、Ｐは始点ｓと終点ｄの間を結ぶ経路で、ｋは任意の数、Δは、与えられた上限である。これらの方式は、下記の非特許文献２の中でそれぞれＥＸＰ方式とＰＯＷＥＲ方式として紹介されている。
R. Gawlick, et al., “Routing and Admission Control in General Topology Networks,” Technical Report STAN-CS-TR-95-1548, Stanford University, Stanford, CA, 1995 L. Narayanan, et al., “Fair and Efficient Call Routing and Admission Control Algorithm,” IEEE GLOBECOM ’99, vol.2, pp. 1527-1534, 1999

Here, P is a path connecting the start point s and the end point d, k is an arbitrary number, and Δ is a given upper limit. These methods are introduced as the EXP method and the POWER method in Non-Patent Document 2 below.
R. Gawlick, et al., “Routing and Admission Control in General Topology Networks,” Technical Report STAN-CS-TR-95-1548, Stanford University, Stanford, CA, 1995 L. Narayanan, et al., “Fair and Efficient Call Routing and Admission Control Algorithm,” IEEE GLOBECOM '99, vol.2, pp. 1527-1534, 1999

  Consider applying the above method to multicast communication.

  In multicast communication, the shape of a route is usually a tree shape, and there are a plurality of route end points. The above criterion does not correspond to the case where there are a plurality of end points, and when calculating the sum of the metrics of the links belonging to the route, the range of links to be calculated, i.e., i∈P ( It is necessary to redefine the part of s, d).

  The present invention has been made in view of the above points, and in the case where there are a plurality of end points, the range of the link to be calculated can be determined, and multicast transfer path setting that enables admission control in multicast communication An object of the present invention is to provide a permission determination method and apparatus, a program, and a storage medium storing the program.

  FIG. 1 is a diagram for explaining the principle of the present invention.

According to the present invention (Claim 1), when the remaining bandwidth of a link in a network is known and information on a multicast route to be set is notified, multicast transfer for determining whether the notified route can be set In the route design permission determination method,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step (step 1) for acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculation step (step 2) for calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that can be used by traffic;
A power calculation step (step 3) in which a value obtained by performing a power operation with an arbitrary number given to the utilization rate as an index is used as a metric;
A determination step (step 4) that permits setting of the route when the sum of the metrics of the links included in the route falls below a predetermined upper limit;
And an output step (step 5) for outputting the determination result of the determination step to the route setting means on the network or in the apparatus.

According to the present invention (Claim 2), when the remaining bandwidth of a link in a network is known and information on a multicast route to be set is notified, multicast transfer for determining whether the notified route can be set In the route design permission determination method,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step of acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculating step of calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that the traffic can use;
A power calculation step with the utilization as a metric that is a value obtained by performing a power calculation with an arbitrary number of exponents;
A determination step of permitting setting of the route when the sum of the metrics of the links included in the route is lower than a predetermined upper limit;
And an output step for outputting the determination result of the determination step to the route setting means on the network or in the apparatus.

According to the present invention (Claim 3), when the remaining bandwidth of a link in a network is known and information on a multicast route to be set is notified, multicast transfer for determining whether the notified route can be set In the route design permission determination method,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step of acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculating step of calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that the traffic can use;
A power operation step using a value obtained by performing a power operation with an arbitrary number given to the utilization as an index, and a metric,
A start point-end point pair detection step for detecting a start point-end point pair having the largest sum of metrics of links that pass when reaching the end point from the start point of the route among the routes given by the route calculating means;
A determination step that permits setting of the route when the sum of the metrics of the links included in the route falls below a given upper limit;
And an output step for outputting the determination result of the determination step to the route setting means on the network or in the apparatus.

According to the present invention (Claim 4), when the remaining bandwidth of a link in a network is known and information of a multicast route to be set is notified, multicast transfer for determining whether the notified route can be set In the route design permission determination method,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step of acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculating step of calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that the traffic can use;
A power calculation step with the utilization as a metric that is a value obtained by performing a power calculation with an arbitrary number of exponents;
A start point-end point pair detection step for detecting a start point-end point pair having the largest sum of metrics of links that pass when reaching the end point from the start point of the route among the routes given by the route calculating means;
A determination step that permits setting of the route when the sum of the metrics of the links included in the route falls below a given upper limit;
And an output step for outputting the determination result of the determination step to the route setting means on the network or in the apparatus.

According to the present invention (Claim 5), when the remaining bandwidth of a link in the network is known and information on a multicast route to be set is notified, multicast transfer for determining whether the notified route can be set In the route design permission determination method,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step of acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculating step of calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that the traffic can use;
A power calculation step for metricing a value obtained by performing a power calculation with an arbitrary given number as an exponent with respect to the utilization rate,
Judgment step of permitting setting of the route when the average value of the metric sum of the links passing when reaching from the start point to the end point of the route among the routes given by the route calculation means is below a given upper limit value When,
And an output step for outputting the determination result of the determination step to the route setting means on the network or in the apparatus.

According to the present invention (Claim 6), when the remaining bandwidth of a link in a network is known and information on a multicast route to be set is notified, multicast transfer for determining whether the notified route can be set In the route design permission determination method,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step of acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculating step of calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that the traffic can use;
A power calculation step to metric a value obtained by performing a power operation as an arbitrary number of given exponents;
Judgment that permits setting of the route when the average value of the metric sums of the links that pass when reaching the end point from the start point of the route is less than the given upper limit among the routes given by the route calculation means Steps,
And an output step for outputting the determination result of the determination step to the route setting means on the network or in the apparatus.

  FIG. 2 is a principle configuration diagram of the present invention.

The present invention (Claim 7) includes an information collecting unit 11 that acquires information on a multicast route to be set, which is calculated by a route calculating unit 20 on a network or inside a device or designated from an external device, A multicast forwarding route design permission judging device for judging whether a route acquired from the information collecting means 11 can be set,
Link detecting means 1 for detecting a link through which the route acquired by the information collecting means passes;
Band information acquisition unit 14 that acquires information on the band already used in the band that can be used for traffic on the link and the band of the route to be set from the network information storage unit 30;
Utilization rate calculating means 2 for calculating the utilization rate by dividing the bandwidth obtained by the bandwidth information acquisition means 14 by the maximum bandwidth that can be used by traffic;
A power calculation means 3 using a value obtained by performing a power calculation with an arbitrary number given to the utilization rate as an index;
A determination unit 4 that permits setting of the route when the sum of the metrics of the links included in the route falls below a predetermined upper limit;
And an output unit 15 for outputting the determination result of the determination unit 4 to the route setting unit 40 on the network or in the apparatus.

The present invention (Claim 8) has information collecting means for acquiring information on a multicast route to be set, which is calculated by a route calculating means on the network or inside the device or designated from an external device, A multicast forwarding route design permission judging device for judging whether a route acquired from an information collecting means can be set,
A link detection means for detecting a link through which the route acquired by the information collection means passes;
Band information acquisition means for acquiring, from the network information storage means, information on a band that is already used in a band that can be used for traffic on a link and a band of a route to be set from now on,
A utilization rate calculating means for calculating a utilization rate by dividing the bandwidth obtained by the bandwidth information obtaining means by the maximum bandwidth that can be used by traffic;
A power calculation means having a metric as a value obtained by performing a power calculation with an arbitrary number of exponents as utilization,
A determination unit that permits setting of the route when the sum of the metrics of the links included in the route is lower than a predetermined upper limit;
Output means for outputting a determination result of the determination means to a route setting means on the network or in the apparatus.

The present invention (Claim 9) has information collecting means for acquiring information of a multicast route to be set, which is calculated on a network or by a route calculating means inside the device or designated from an external device, A multicast forwarding route design permission judging device for judging whether a route acquired from an information collecting means can be set,
A link detection means for detecting a link through which the route acquired by the information collection means passes;
Band information acquisition means for acquiring, from the network information storage means, information on a band that is already used in a band that can be used for traffic on a link and a band of a route to be set from now on,
A utilization rate calculating means for calculating a utilization rate by dividing the bandwidth obtained by the bandwidth information obtaining means by the maximum bandwidth that can be used by traffic;
A power calculation means using a value obtained by performing a power operation with an arbitrary number given to the utilization as an index, and a metric,
A start point-end point pair detecting unit for detecting a start point-end point pair having the largest sum of the metrics of the links that pass when reaching the end point from the start point of the route among the routes given by the route calculating unit;
A determination unit that permits setting of the route when the sum of the metrics of the links included in the route falls below a given upper limit;
Output means for outputting a determination result of the determination means to a route setting means on the network or in the apparatus.

The present invention (Claim 10) has information collecting means for acquiring information of a multicast route to be set, which is calculated on a network or by a route calculating means inside the device or designated from an external device, A multicast forwarding route design permission judging device for judging whether a route acquired from an information collecting means can be set,
A link detection means for detecting a link through which the route acquired by the information collection means passes;
Band information acquisition means for acquiring, from the network information storage means, information on a band that is already used in a band that can be used for traffic on a link and a band of a route to be set from now on,
A utilization rate calculating means for calculating a utilization rate by dividing the bandwidth obtained by the bandwidth information obtaining means by the maximum bandwidth that can be used by traffic;
A power calculation means having a metric as a value obtained by performing a power calculation with an arbitrary number of exponents as utilization,
A start point-end point pair detecting unit for detecting a start point-end point pair having the largest sum of the metrics of the links that pass when reaching the end point from the start point of the route among the routes given by the route calculating unit;
A determination unit that permits setting of the route when the sum of the metrics of the links included in the route falls below a given upper limit;
Output means for outputting a determination result of the determination means to a route setting means on the network or in the apparatus.

The present invention (Claim 11) has information collecting means for acquiring information on a multicast route to be set, which is calculated on a network or by a route calculating means inside the device or designated from an external device, A multicast forwarding route design permission judging device for judging whether a route acquired from an information collecting means can be set,
A link detection means for detecting a link through which the route acquired by the information collection means passes;
Band information acquisition means for acquiring, from the network information storage means, information on a band that is already used in a band that can be used for traffic on a link and a band of a route to be set from now on,
A utilization rate calculating means for calculating a utilization rate by dividing the bandwidth obtained by the bandwidth information obtaining means by the maximum bandwidth that can be used by traffic;
A power calculation means for metric of a value obtained by performing a power calculation with an arbitrary given number as an exponent with respect to the utilization rate;
Judgment means that permits setting of the route when the average value of the metric sum of the links that pass when reaching from the start point to the end point of the route among the routes given by the route calculation means falls below a given upper limit value. When,
Output means for outputting a determination result of the determination means to a route setting means on the network or in the apparatus.

The present invention (Claim 12) has information collecting means for acquiring information of a multicast route to be set, which is calculated on a network or by a route calculating means in the device or designated from an external device, A multicast forwarding route design permission judging device for judging whether a route acquired from an information collecting means can be set,
A link detection means for detecting a link through which the route acquired by the information collection means passes;
Band information acquisition means for acquiring, from the network information storage means, information on a band that is already used in a band that can be used for traffic on a link and a band of a route to be set from now on,
A utilization rate calculating means for calculating a utilization rate by dividing the bandwidth obtained by the bandwidth information obtaining means by the maximum bandwidth that can be used by traffic;
A power calculation means for metricing a value obtained by performing a power calculation with an arbitrary number of exponents given to the utilization rate;
Judgment that permits setting of the route when the average value of the metric sums of the links that pass when reaching the end point from the start point of the route is less than the given upper limit among the routes given by the route calculation means Means,
Output means for outputting a determination result of the determination means to a route setting means on the network or in the apparatus.

According to the present invention (Claim 13), when the remaining bandwidth of a link in a network is known and information on a multicast route to be set is notified, multicast transfer for determining whether the notified route can be set A route design permission determination program,
A multicast transfer route design permission determination program for causing a computer to execute processing used to realize the multicast transfer route design permission determination method according to claim 1.

According to the present invention (Claim 14), when the remaining bandwidth of a link in a network is known and information on a multicast route to be set is notified, multicast transfer for determining whether the notified route can be set A storage medium storing a route design permission determination program,
A storage medium storing a multicast transfer route design permission determination program for causing a computer to execute processing used to realize the multicast transfer route design permission determination method according to claim 1.

By using the present invention, in the case of multicast communication where there are a plurality of end points and the route exists on the tree,
The range of the link to be calculated can be determined, and by performing metric calculation, admission control in multicast communication can be performed using the above-described determination criteria.

  As a result, it becomes possible for more users to secure the transfer route, and as a result, the number of data flows that can be accommodated increases.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the route setting permission determining device will be described. In the following description, a route is calculated based on the start point, end point, and bandwidth information of a given route for setting the route in the network as a whole system, and the result is input to the route setting permission judging device to determine the setting. An operation of setting a multicast transfer route is performed by inputting the result to the route setting device.

  FIG. 3 is a configuration diagram of the route permission determination unit according to the embodiment of the present invention.

  The route permission determination unit 10 shown in the figure is an indispensable module in the present invention.

  The route permission determination unit 10 has an information input interface 11 and a result notification interface 15 as an interface with the outside. The information input interface 11 has a role of passing route information from the operator, the route calculation unit 20 and the module to the route setting permission determination unit (module) 12.

  At this time, it is assumed that an arbitrary processing module is included between the interface 11 and the route setting permission determination module 12. Further, the process of converting the input information so that the path setting permission determination module 12 can process it is performed by an arbitrary module existing between these modules. Further, the determination result is delivered to the route setting unit 40 or the module via the result notification interface 15.

  It is assumed that an arbitrary module is inserted between the route setting permission determination module 12 and the result notification interface 15 as in the case of input. When the determination result is notified to the outside, the process of converting the determination result to an external device or module is also performed by any module existing between them.

  Information obtained by the information input interface 11 is processed by the route setting permission determination module 12. The route setting permission determination module 12 acquires bandwidth information used for route setting permission determination from the network information database 30 and performs processing while writing information in the storage medium 13 for temporary storage.

  Possible relationships between the route setting permission determination unit 10 and other modules and devices are shown in FIGS.

  In the configuration shown in FIG. 4, only the route setting permission determination unit 10 is mounted on one device 1, and the network information database 30, the route calculation device 20, and the route setting device 20 are mounted on different devices, respectively via a network. Indicates the status of communication.

  The route setting permission determining unit 10 has the configuration shown in FIG.

  The route calculation device 20 acquires information on the start point and end point group of the route from the operator, acquires bandwidth information from the network information database 30, calculates an appropriate transfer route, and transfers it to the route setting permission determination unit 10. To do.

  The network information database 30 is a database that holds link residual bandwidth information.

  The route setting device 40 performs route setting processing when “setting permission” is notified as a determination result from the route setting permission determination unit 10.

  In the configuration shown in FIG. 5, the network information database 30 and the route setting permission determination unit 10 are mounted on one device 100, and the route calculation device 20 and the route setting device 40 are mounted on different devices, and each device is mutually connected. Indicates the status of communication.

  The configuration shown in FIG. 6 shows a situation in which a device other than the route setting device 40 is mounted on the same device 100 and the route setting device 40 and the device 100 communicate with each other.

  The configuration shown in FIG. 7 shows a situation in which a device other than the route calculation device 20 is mounted on the same device 100 and the route calculation device 20 and the device 100 communicate with each other.

  The configuration shown in FIG. 8 shows a situation in which all devices are mounted on the same device 100.

  As described above, the present invention can take various forms of the system configuration. As a necessary condition, it is possible that the route setting permission determination unit 10 is mounted on some device.

  Next, the route setting permission determining operation of the actual route setting permission determining unit 10 will be described.

  9 to 11 show the flow of operations of the six methods included in the present invention. Both of the six methods give a setting permission when the sum of the evaluation metrics of the links included in the path to be evaluated falls below a given upper limit value. The different operations are the path to be evaluated and the metric calculation method. Therefore, the features of the six methods can be classified as follows.

図９は、本発明の一実施の形態における経路判定許可判断方法のフローチャート（その１）であり、評価対象が経路全体に含まれるリンクのメトリック和である方式を示している。図１０は、本発明の一実施の形態における経路判定許可判断方法のフローチャート（その２）であり、評価対象が経路内の最もメトリック和が大きい始点−終点間の経路に含まれるリンクのメトリック和である方式を示している。

FIG. 9 is a flowchart (part 1) of the route determination permission determination method according to the embodiment of the present invention, and shows a method in which the evaluation target is the metric sum of the links included in the entire route. FIG. 10 is a flowchart (No. 2) of the route determination permission determination method according to the embodiment of the present invention, and the metric sum of the links included in the route between the start point and the end point where the evaluation target has the largest metric sum in the route. This is a method.

  First, the operation flow of methods 1 and 2 shown in FIG. 9 will be described.

  First, before executing these methods, the operator prepares the network topology and bandwidth information used by the route setting permission determination unit 10 in advance. Examples of the means to be prepared include manual operator input and database construction by a routing protocol such as OSPF-TE.

  When these pieces of information are obtained by any means, the operator inputs information on the start point s and end point group D to the route calculation device 20 from an external device (input means such as a keyboard and a mouse) (step 101).

  Based on the input information, the route calculation device 20 calculates an appropriate transfer route P (s, D) (step 102).

  The route setting permission determining device 100 (hereinafter referred to as the route setting permission determining unit 10) inputs P (s, D) calculated by the route calculating device 20 and an operator external device (input means such as a keyboard and a mouse). The allowable value Δ used for determination is accepted as an input (step 103).

  Next, the link i included in the route P (s, D) acquired from the route calculation device 20 is searched (step 104). Then, the remaining bandwidth information of the corresponding link is obtained from the network information database 30 (step 105).

  Up to this point, both methods 1 and 2 are common.

Next, the metric value of the link used for route setting permission determination is calculated. In this case, system 1 may use the value _{m i} = _{μ i} ^k metric _{m i} of Link i (step 106-1), the method 2,

という値を使用する（ステップ１０６−２）。ここで、μ_ｉはリンクｉの利用率を表す。

Is used (step 106-2). Here, μ _i represents the utilization rate of the link i.

Here, among the bands that can be used in the link i for the path for which the utilization rate is to be set, the sum of the band amount for another path that has already been allocated and the bandwidth amount of the path that is the current allocation determination target, This is a value obtained by dividing the maximum bandwidth that the path can use. When these values are calculated, the metric _mi sum S of the link i included in the path P (s, D) is taken for the entire path (step 107). If S ≦ Δ, it is determined that the setting is permitted, and the path setting device 40 or the module is notified (step 108).

  Next, the operation of methods 3 and 4 shown in FIG. 10 will be described.

  The methods 3 and 4 are the same as those up to step 105 in FIG. 9 until step 205. Regarding step 206, step 206-1 in FIG. 9 is executed in method 3, and step 206-2 is executed in method 4. . In both equations, when the route is traced from the starting point s to the ending point d, a route P 'that is a starting point-ending point pair having the largest sum of the metrics of the links included in the route that has been traced is searched (step 207). Then, the metric sum of the searched route is set as S '(step 208). If S ′ ≦ Δ, it is determined that the setting is permitted, and the path setting device 40 or the module is notified (step 209).

  Finally, the operation of methods 5 and 6 shown in FIG. 11 will be described.

  Methods 5 and 6 are the same up to step 105 in FIG. 9 until step 305. Regarding step 306, step 306-1 is executed in method 5, and step 306-2 is executed in method 6. Next, in both equations, the metric sum S ″ of the links included in the route when the route is traced from the starting point s to the ending point d for each end point is calculated (step 307). E [S "] is calculated (step 308). If E [S ″] ≦ Δ, it is determined that the setting is permitted, and the device or module that performs path setting is notified (step 309).

  Next, a specific example of calculation is shown.

  FIG. 12 shows paths used in the calculation example in the embodiment of the present invention. The route to be set is set from the start point s to the end points d1, d2, and d3 by the route setting device 40, and the bandwidth to be secured is 30M. As for the network for setting the route, a network capable of setting the maximum bandwidth that can be used for each class is assumed. Therefore, this route cannot secure a bandwidth equal to or higher than the remaining bandwidth of the class to which the route belongs. Here, the remaining bandwidth refers to a value obtained by subtracting the bandwidth already secured by the traffic of the class from the maximum bandwidth allocated to the class. In this example, the maximum bandwidth allocated to the class is 100 Mbps in all links, and the physical maximum bandwidth of the link is 1 Gbps.

  The other tracks belonging to the same class that have already been secured are 20 Mbps for link s → A (link 1), 50 Mbps for A → d1 (link 2), 40 Mbps for A → d2 (link 3), and s → d3 (link 4) uses a bandwidth of 30 Mbps.

FIG. 13 shows a metric calculation method related to the above-described methods 1, 3, and 5. These methods use m _i = μ _i ^k as a metric calculation formula. Here, an example of k = 2 is considered. The utilization rate of each link after this route is set is based on the above definition.
Link 1: (20 + 30) /100=0.5
Link 2: (50 + 30) /100=0.8
Link 3: (40 + 30) /100=0.7
Link 4: (30 + 30) /100=0.6
It is. From this, the metric for each link is
m ₁ = {(20 + 30) / 100} ² = 0.25
m ₂ = {(50 + 30) / 100} ² = 0.64
m ₃ = {(40 + 30) / 100} ² = 0.49
m ₄ = {(30 + 30) / 100} ² = 0.36
It becomes.

  Next, a metric calculation method related to methods 2, 4, and 6 shown in FIG.

  The link utilization rate is as described above, but the metric calculation method is

となる。よって、

It becomes. Therefore,

となる。

It becomes.

  An evaluation standard metric used for route setting permission determination is calculated from the calculated metric. This is shown in FIGS. 15, 16, and 17. FIG.

  FIG. 15 shows a case where the sum of the metrics of the links included in the entire route is used as the evaluation reference metric.

In Method 1, since the sum of the metric values considered using FIG. 13 is taken, the evaluation reference metric is m ₁ + m ₂ + m ₃ + m ₄ = 3.12.

In method 2, since the sum of the metric values considered using FIG. 14 is taken, m ₁ + m ₂ + m ₃ + m ₄ = 6.268.

In FIG. 16, among the metric sums between the start point and the end point, the one having the largest metric sum is used as the evaluation judgment criterion. In this case, the interval having the largest metric sum in both equations is s → d1. Therefore, the evaluation standard metric of method 3 is
Path s → d1: 1.414 + 1.714 = 0.89
And the evaluation metric for Method 4 is
Path s → d1: 1.414 + 1.714 = 3.128
It becomes.

In FIG. 17, the average value of the metric sum between the start point and the end point is used as the evaluation reference metric. In method 5, the metric sum of the path between each start point and end point is path s → d1: 1.414 + 1.714 = 0.89
Path s → d2: 1.414 + 1.625 = 0.74
Path s → d3: 1.414 + 1.515 = 0.61
In method 6,
Path s → d1: 1.414 + 1.714 = 3.128
Path s → d2: 1.414 + 1.625 = 3.039
Path s → d3: 1.414 + 1.515 = 2.929
It is. Taking these averages, in Method 5, (0.89 + 0.74 + 0.61) /3=0.747 is the evaluation reference metric, and in Method 6, (3.128 + 3.039 + 2.929) /3=3.032.

  Then, the route setting permission evaluation is judged. When the given allowable value Δ is below the calculated evaluation reference metric, the route setting permission is issued. The setting permission is output to the route setting device 40.

  The flowcharts shown in FIGS. 9 to 11 are constructed as a program, installed in a computer used as a route setting permission determination device, and executed by a control means such as a CPU of the computer, or via a network. It can be distributed.

  When implementing the present invention, the constructed program is stored in a portable storage medium such as a hard disk, a flexible disk, or a CD-ROM connected to a computer used as a path setting permission judging device. It can be installed and executed on a computer.

  The present invention is not limited to the above-described embodiments and examples, and various modifications and applications can be made within the scope of the claims.

  The present invention is applicable to a system that supports route setting technology.

It is a figure for demonstrating the principle of this invention. It is a principle block diagram of this invention. It is a system configuration figure which has a route setting permission judging part in one embodiment of the present invention. FIG. 3 is a system configuration diagram (part 1) illustrating a relationship between a route setting permission determination device and another device according to the embodiment of the present invention. FIG. 6 is a system configuration diagram (part 2) illustrating a relationship between the route setting permission determination device and another device according to the embodiment of the present invention. It is a system block diagram (the 3) which shows the relationship between the path | route setting permission judgment apparatus in one embodiment of this invention, and another apparatus. FIG. 10 is a system configuration diagram (part 4) illustrating a relationship between the route setting permission determination device and another device according to the embodiment of the present invention. It is a system block diagram (the 5) which shows the relationship between the path | route setting permission judgment apparatus in one embodiment of this invention, and another apparatus. It is a flowchart (the 1) of the path | route setting permission judgment method in one embodiment of this invention. It is a flowchart (the 2) of the route setting permission judgment method in one embodiment of this invention. It is a flowchart (the 3) of the route setting permission judgment method in one embodiment of this invention. The route used in the calculation example in the embodiment of the present invention. It is a metric (method 1, 3, 5) for each link in an embodiment of the present invention. It is a metric (method 2, 4, 6) for each link in the embodiment of the present invention. It is calculation (system 1, 2) of the evaluation reference | standard in one embodiment of this invention. It is calculation (method 3, 4) of the evaluation reference | standard in one embodiment of this invention. It is calculation of the evaluation criteria in the embodiment of the present invention (methods 5 and 6).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Link detection means 2 Utilization rate calculation means 3 Power calculation means 4 Determination means 10 Path setting permission determination part 11 Information collection means, information input interface 12 Path setting permission determination module 13 Recording medium 14, such as a temporary variable and a calculation result, Band information acquisition Means, information acquisition interface 15 output means, result notification interface 20 route calculation means, route calculation device 30 network information database 40 route setting means, route setting device 100 route setting permission judgment device

Claims (14)

In the multicast transfer route design permission determination method for determining whether the notified route can be set when the remaining bandwidth of the link in the network is known and the multicast route information to be set is notified,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step of acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculating step of calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that can be used by the traffic;
A power operation step using a value obtained by performing a power operation with an arbitrary number given to the utilization rate as an index; and
A determination step of permitting setting of the route when the sum of the metrics of the links included in the route is lower than a predetermined upper limit;
An output step of outputting the determination result of the determination step to a route setting means on the network or in the device;
A multicast forwarding route design permission judging method characterized by comprising: In the multicast transfer route design permission determination method for determining whether the notified route can be set when the remaining bandwidth of the link in the network is known and the multicast route information to be set is notified,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step of acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculating step of calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that can be used by the traffic;
A power operation step using the value obtained by performing a power operation as an arbitrary number of given exponents as a metric; and
A determination step of permitting setting of the route when the sum of the metrics of the links included in the route is lower than a predetermined upper limit;
An output step of outputting the determination result of the determination step to a route setting means on the network or in the device;
A multicast forwarding route design permission judging method characterized by comprising: In the multicast transfer route design permission determination method for determining whether the notified route can be set when the remaining bandwidth of the link in the network is known and the multicast route information to be set is notified,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step of acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculating step of calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that can be used by the traffic;
A power operation step using a value obtained by performing a power operation with an arbitrary number given to the utilization rate as an index; and
A start point-end point pair detecting step for detecting a start point-end point pair having the largest sum of metrics of the links that pass when reaching the end point from the start point of the route among the routes given by the route calculating means;
A determination step of permitting setting of the route when the sum of the metrics of the links included in the route is less than a given upper limit;
An output step of outputting the determination result of the determination step to a route setting means on the network or in the device;
A multicast forwarding route design permission judging method characterized by comprising: In the multicast transfer route design permission determination method for determining whether the notified route can be set when the remaining bandwidth of the link in the network is known and the multicast route information to be set is notified,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step of acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculating step of calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that can be used by the traffic;
A power operation step using the value obtained by performing a power operation as an arbitrary number of given exponents as a metric; and
A start point-end point pair detecting step for detecting a start point-end point pair having the largest sum of metrics of the links that pass when reaching the end point from the start point of the route among the routes given by the route calculating means;
A determination step of permitting setting of the route when the sum of the metrics of the links included in the route is less than a given upper limit;
An output step of outputting the determination result of the determination step to a route setting means on the network or in the device;
A multicast forwarding route design permission judging method characterized by comprising: In the multicast transfer route design permission determination method for determining whether the notified route can be set when the remaining bandwidth of the link in the network is known and the multicast route information to be set is notified,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step of acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculating step of calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that can be used by the traffic;
A power operation step for metricing a value obtained by performing a power operation with an arbitrary number as an index for the utilization rate;
Judgment that permits setting of the route when the average value of the metric sums of the links that pass when reaching from the start point to the end point of the route among the routes given by the route calculation means is below a given upper limit value Steps,
An output step of outputting the determination result of the determination step to a route setting means on the network or in the device;
A multicast forwarding route design permission judging method characterized by comprising: In the multicast transfer route design permission determination method for determining whether the notified route can be set when the remaining bandwidth of the link in the network is known and the multicast route information to be set is notified,
A link calculated by a route calculation means on the network or in the device or a route through which a route designated by an external device passes is detected, and a bandwidth already used in a bandwidth that can be used by traffic on the link, and a band used from these. A bandwidth information acquisition step of acquiring information on the bandwidth of the route to be set from the network information storage means;
A utilization rate calculating step of calculating a utilization rate by dividing the bandwidth obtained in the bandwidth information acquisition step by the maximum bandwidth that can be used by the traffic;
A power operation step for metricing a value obtained by performing a power operation as an arbitrary number of given exponents;
Among the routes given by the route calculation means, the setting of the route is permitted when the average value of the sum of the metrics of the links that pass when reaching from the start point to the end point of the route is below a given upper limit value. A determination step;
An output step of outputting the determination result of the determination step to a route setting means on the network or in the device;
A multicast forwarding route design permission judging method characterized by comprising: It has an information collection unit that acquires information on a multicast route to be set, which is calculated by a route calculation unit on the network or inside the device or designated from an external device, and sets the route acquired from the information collection unit A multicast forwarding route design permission judging device for judging whether or not
Link detecting means for detecting a link through which the route acquired by the information collecting means passes;
Band information acquisition means for acquiring, from the network information storage means, information on a band that is already used in a band that can be used by traffic on the link and a band of a route to be set from now on,
Utilization rate calculating means for calculating a utilization rate by dividing the bandwidth obtained by the bandwidth information acquisition means by the maximum bandwidth that can be used by the traffic;
A power calculation means using a value obtained by performing a power calculation with an arbitrary number given to the utilization as an index;
A determination unit that permits setting of the route when the sum of the metrics of the links included in the route is lower than a predetermined upper limit;
An output unit that outputs a determination result of the determination unit to a route setting unit on the network or in the apparatus;
A multicast forwarding route design permission judging device characterized by comprising: It has an information collection unit that acquires information on a multicast route to be set, which is calculated by a route calculation unit on the network or inside the device or designated from an external device, and sets the route acquired from the information collection unit A multicast forwarding route design permission judging device for judging whether or not
Link detecting means for detecting a link through which the route acquired by the information collecting means passes;
Band information acquisition means for acquiring, from the network information storage means, information on a band that is already used in a band that can be used by traffic on the link and a band of a route to be set from now on,
Utilization rate calculating means for calculating a utilization rate by dividing the bandwidth obtained by the bandwidth information acquisition means by the maximum bandwidth that can be used by the traffic;
Power calculation means using the value obtained by performing a power operation as an arbitrary number of exponents as a metric;
A determination unit that permits setting of the route when the sum of the metrics of the links included in the route is lower than a predetermined upper limit;
An output unit that outputs a determination result of the determination unit to a route setting unit on the network or in the apparatus;
A multicast forwarding route design permission judging device characterized by comprising: It has an information collection unit that acquires information on a multicast route to be set, which is calculated by a route calculation unit on the network or inside the device or designated from an external device, and sets the route acquired from the information collection unit A multicast forwarding route design permission judging device for judging whether or not
Link detecting means for detecting a link through which the route acquired by the information collecting means passes;
Band information acquisition means for acquiring, from the network information storage means, information on a band that is already used in a band that can be used by traffic on the link and a band of a route to be set from now on,
Utilization rate calculating means for calculating a utilization rate by dividing the bandwidth obtained by the bandwidth information acquisition means by the maximum bandwidth that can be used by the traffic;
A power calculation means using a value obtained by performing a power calculation with an arbitrary number given to the utilization as an index;
A start point-end point pair detecting means for detecting a start point-end point pair having the largest sum of metrics of the links that pass when reaching the end point from the start point of the route among the paths given by the route calculating means;
Determining means for permitting setting of the route when the sum of the metrics of the links included in the route is less than a given upper limit;
An output unit that outputs a determination result of the determination unit to a route setting unit on the network or in the apparatus;
A multicast forwarding route design permission judging device characterized by comprising: It has an information collection unit that acquires information on a multicast route to be set, which is calculated by a route calculation unit on the network or inside the device or designated from an external device, and sets the route acquired from the information collection unit A multicast forwarding route design permission judging device for judging whether or not
Link detecting means for detecting a link through which the route acquired by the information collecting means passes;
Band information acquisition means for acquiring, from the network information storage means, information on a band that is already used in a band that can be used by traffic on the link and a band of a route to be set from now on,
Utilization rate calculating means for calculating a utilization rate by dividing the bandwidth obtained by the bandwidth information acquisition means by the maximum bandwidth that can be used by the traffic;
Power calculation means using the value obtained by performing a power operation as an arbitrary number of exponents as a metric;
A start point-end point pair detecting means for detecting a start point-end point pair having the largest sum of metrics of the links that pass when reaching the end point from the start point of the route among the paths given by the route calculating means;
Determining means for permitting setting of the route when the sum of the metrics of the links included in the route is less than a given upper limit;
An output unit that outputs a determination result of the determination unit to a route setting unit on the network or in the apparatus;
A multicast forwarding route design permission judging device characterized by comprising: It has an information collection unit that acquires information on a multicast route to be set, which is calculated by a route calculation unit on the network or inside the device or designated from an external device, and sets the route acquired from the information collection unit A multicast forwarding route design permission judging device for judging whether or not
Link detecting means for detecting a link through which the route acquired by the information collecting means passes;
Band information acquisition means for acquiring, from the network information storage means, information on a band that is already used in a band that can be used by traffic on the link and a band of a route to be set from now on,
Utilization rate calculating means for calculating a utilization rate by dividing the bandwidth obtained by the bandwidth information acquisition means by the maximum bandwidth that can be used by the traffic;
A power calculation means for metricing a value obtained by performing a power calculation with the given arbitrary number as an exponent with respect to the utilization rate;
Judgment that permits setting of the route when the average value of the metric sums of the links that pass when reaching from the start point to the end point of the route among the routes given by the route calculation means is below a given upper limit value Means,
An output unit that outputs a determination result of the determination unit to a route setting unit on the network or in the apparatus;
A multicast forwarding route design permission judging device characterized by comprising: It has an information collection unit that acquires information on a multicast route to be set, which is calculated by a route calculation unit on the network or inside the device or designated from an external device, and sets the route acquired from the information collection unit A multicast forwarding route design permission judging device for judging whether or not
Link detecting means for detecting a link through which the route acquired by the information collecting means passes;
Band information acquisition means for acquiring, from the network information storage means, information on a band that is already used in a band that can be used by traffic on the link and a band of a route to be set from now on,
Utilization rate calculating means for calculating a utilization rate by dividing the bandwidth obtained by the bandwidth information acquisition means by the maximum bandwidth that can be used by the traffic;
A power calculation means for metricing a value obtained by performing a power calculation with the utilization rate being an arbitrary number of given exponents;
Among the routes given by the route calculation means, the setting of the route is permitted when the average value of the sum of the metrics of the links that pass when reaching from the start point to the end point of the route is below a given upper limit value. A determination means;
An output unit that outputs a determination result of the determination unit to a route setting unit on the network or in the apparatus;
A multicast forwarding route design permission judging device characterized by comprising: A multicast transfer route design permission determination program for determining whether the notified route can be set when the remaining bandwidth of the link in the network is known and the multicast route information to be set is notified,
7. A multicast transfer route design permission determination program that causes a computer to execute processing used to realize the multicast transfer route design permission determination method according to claim 1. A memory that stores a multicast transfer route design permission judgment program that determines whether the notified route can be set when the remaining bandwidth of the link in the network is known and information on the multicast route to be set is notified A medium,
A storage medium storing a multicast transfer route design permission determination program, which causes a computer to execute processing used to realize the multicast transfer route design permission determination method according to claim 1.

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