JP2003143192A - Optical communication network, program and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently transfer burst data by saving time for setting a cut- through pass. SOLUTION: A cut-through pass setting route is previously calculated, the cut-through pass for rapidly transferring burst data at the point of time when the burst data is received is actually set and transfer is performed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is used in optical communication.
The present invention relates to an optical burst data transfer technique in a communication network that uses an optical wavelength as a communication medium for burst data transfer.

[0002]

2. Description of the Related Art An ordinary IP (Internet Pr
In data transfer, a plurality of routers are arranged from the start point to the end point, and the data is transferred via this router. At this time, each router determines the router to be transferred next by referring to the IP address given to the packet and transfers the packet.

In such an optical communication network, when reading the header information of a packet, an optical signal is first converted into an electric signal and then read. The router determines the router to be transferred next according to the IP address thus read.

Further, when transferring data in bursts, since the transfer efficiency is not good because the IP address is read for each packet, a cut-through path is previously set between the starting point and the end point. Since it is set and the IP header does not need to be read in this cut-through path section, the optical signal can be transferred at high speed as it is.

[0005]

In such conventional optical communication, it is necessary to set a cut-through path in advance when transferring burst data using the cut-through path. In order to set the cut-through path in advance, each router passing from the starting point to the end point requests that the cut-through path be set, and each router responds to this request, and the pre-setting of the cut-through path is completed for the first time. To do.

At this time, looking at the cut-through path setting procedure in each router, first, the header information of the arriving optical IP packet is converted into an electric signal, and the information corresponding to the cut-through path setting request is included therein. Is read, and if the setting request is included, the wavelength for the cut-through path setting is selected, and if the wavelength can be selected, the cut-through path setting is actually performed. And for the wavelength for which the cut-through path is set,
Since it is no longer necessary to read the header information of the IP packet, the settings are changed so that the IP packet is transferred as an optical signal in a distinctive manner from other wavelengths.

However, such a setting procedure requires a considerable amount of time. For example, it is assumed that it takes 2t seconds to set the cut-through path. If it takes 3 t seconds to transfer the burst data using this cut-through path, it takes 5 t seconds to set the cut-through path and complete the transfer of the burst data. In this example, approximately half of the 5t seconds required for burst data transfer was used for setting the cut-through path. If the time required for such advance cut-through path can be allotted for data transfer, further improvement in transfer efficiency can be expected.

The present invention has been made against such a background, and provides an optical communication network, a program and a recording medium capable of efficiently performing burst data transfer while saving time for setting a cut-through path. The purpose is to provide.

[0009]

According to the present invention, a set path of a cut-through path is calculated in advance, and when a burst data arrives, a cut-through path for promptly transferring the burst data is actually set and transferred. It is characterized by performing.

A first aspect of the present invention is to provide a transmission-side edge node accommodating a data transfer source, a reception-side edge node accommodating a data transfer destination, and between the transmission-side edge node and the reception-side edge node. And a relay node disposed in the optical communication network, the optical communication network including means for setting and releasing a cut-through path passing through the relay node between the transmission-side edge node and the reception-side edge node.

Here, the feature of the present invention is that the means for setting and releasing the cut-through path has a plurality of cut-through path setting paths from one transmission side edge node to a plurality of reception side edge nodes in advance. Is provided, and means for detecting the arrival of the first packet of the burst data to the transmitting-side edge node is provided, which is calculated in advance according to the IP address of the first packet detected by this detecting means. There is a means for actually setting a cut-through path of a path from the set paths of the plurality of cut-through paths to the receiving edge node corresponding to the IP address.

By thus calculating the set path of the cut-through path in advance, the time from the arrival of the burst data to the actual setting of the cut-through path is saved and the burst data transfer is efficiently performed. be able to.

The means for measuring the past traffic amount transferred from the edge node on the transmitting side to the plurality of edge nodes on the receiving side respectively, and the means for calculating the set route are the measurement results of the measuring means. Therefore, it is desirable to provide a means for preliminarily calculating a cut-through path setting route for a route from the transmitting side edge node exceeding the predetermined traffic amount to the receiving side edge node.

This makes it possible to determine the usefulness of pre-calculating the set route of the cut-through path. Therefore, the route of which the pre-calculated set route is less useful is effective for normal IP transfer. Can be used.

The means for calculating the set route is proportional to the traffic amount with respect to the route from the transmitting side edge node exceeding the predetermined traffic amount to the receiving side edge node according to the measurement result of the measuring means. It is also possible to provide a means for calculating in advance one or more cut-through path setting paths.

As a result, burst data can be transferred by a plurality of cut-through paths for a route having a large traffic volume, and efficient burst data transfer can be performed.

The means for actually setting includes means for setting a plurality of cut-through paths from one edge node on the transmitting side to one edge node on the receiving side, and the edge node on the transmitting side stores a series of burst data. It is preferable to provide a means for distributing a plurality of constituent packets to the plurality of cut-through paths and transferring the plurality of cut-through paths, and to each of the distributed packets is given a sequence number before being distributed.

Thus, for burst data having a large capacity, a series of burst data can be divided and transferred in parallel using a plurality of cut-through paths. At this time, a sequence number is given to each packet, so that the order of the packets can be guaranteed.

The means for calculating the set route comprises means for calculating in advance the set route of the cut-through path having a plurality of different link costs from one edge node on the transmitting side to one edge node on the receiving side. The means for actually setting the link cost corresponding to the QoS class among the plurality of cut-through paths having different link costs according to the QoS (Quality of Service) class of the burst data arriving at the transmission side edge node. It is also possible to provide a means for actually setting the cut-through path in the setting route of. The link cost is the transmission load of the link defined based on physical or logical parameters.

As a result, cut-through paths having different link costs corresponding to different attributes, hop numbers, delay times, etc. can be selected and dealt with depending on the QoS class.

The means for calculating the set path comprises means for calculating in advance the set paths of a plurality of cut-through paths from one edge node on the transmitting side to one edge node on the receiving side. A set path of a cut-through path used for transfer of the burst data is pre-assigned according to the burst length of the data, and the means for actually setting is the plurality of sets according to the burst length of the burst data that arrives at the transmission side edge node. It is also possible to provide a means for actually setting the cut-through path of the set path assigned to the burst length from among the set paths of the cut-through path.

This makes it possible to balance the load and
If the sending edge node or relay node has a configuration for buffering burst data, and if the burst data length to be transferred by each cut-through path is defined, the efficiency of use of the buffer compared to the case where it is not defined Can be increased.

Alternatively, the feature of the present invention is that
The means for setting and releasing the cut-through path comprises means for calculating a set route of a plurality of cut-through paths for one of the plurality of receiving-side edge nodes from one of the transmitting-side edge nodes in advance. Means for detecting the arrival of the first packet of the burst data is provided, and the IP address is selected from the set paths of the plurality of cut-through paths which are calculated in advance according to the IP address of the first packet detected by the detecting means. There is a means for actually setting two cut-through paths, one of which is the working path and the other of which is the protection path, on different setting paths to the receiving side edge node corresponding to. This makes it possible to realize highly reliable burst data transfer.

The transmission side edge node is provided with means for transferring the same burst data to the working path and the protection path, so that the burst data is normally transferred even if a failure occurs in one of the paths. be able to.

Alternatively, the feature of the present invention is that
The means for setting and releasing the cut-through path comprises means for calculating a set route of a plurality of cut-through paths for one of the plurality of receiving-side edge nodes from one of the transmitting-side edge nodes in advance. Means for detecting the arrival of the first packet of the burst data is provided, and the IP address is selected from the set paths of the plurality of cut-through paths which are calculated in advance according to the IP address of the first packet detected by the detecting means. The means for actually setting the cut-through path of the set route to the receiving side edge node corresponding to, as the working path, and the set route of the spare cut-through path for the working path different from the working path are calculated in advance. Of the cut-through paths And means for actually setting a spare cut-through path to the setting path of the spare cut-through path selected by the means for selecting when the failure of the active cut-through path occurs. Where it is. This makes it possible to realize highly reliable burst data transfer.

The transmitting edge node detects means for transferring burst data to the working path when no failure is detected for the path on which the working path is set, and a failure on the path for which the working path is set is detected. By providing a means for transferring the burst data to the protection path when this occurs, it is possible to normally transfer the burst data using the protection path even if a failure occurs in the working path.

At this time, a sequence number is given to the packet forming the burst data, and when the burst data transferred by the working path is interrupted, the receiving edge node gives the final sequence number to the backup path. Means for notifying the transmitting side edge node by means of, and the transmitting side edge node prior to transferring the burst data accumulated in the temporarily storing means and the burst data accumulated in the temporarily storing means to the backup path. By referring to the final sequence number notified from the receiving-side edge node, and using the packet having a sequence number next to the final sequence number as the first packet of burst data to be transferred to the backup path. Is desirable. As a result, it is possible to avoid packet loss or switching of the order caused by switching from the working path to the protection path.

A second aspect of the present invention is a program, which is characterized by being installed in an information processing device so that the information processing device can be provided with a transmission-side edge node and a relay in an optical communication network. As a function of setting and releasing a cut-through path that passes through a node and a receiving-side edge node, a function of previously calculating setting paths of a plurality of cut-through paths from one transmitting-side edge node to a plurality of receiving-side edge nodes. , A function of detecting arrival of a leading packet of burst data to the transmitting side edge node, and a setting route of the plurality of cut-through paths which is calculated in advance according to the IP address of the leading packet detected by the detecting function. Edge node on the receiving side corresponding to the IP address from the inside Indeed there is to be realized and a function of setting a cut-through path to path.

As a function for realizing the function of measuring the past traffic volume transferred from the transmitting side edge node to the plurality of receiving side edge nodes and calculating the set route, measurement of this measuring function According to the result, it is possible to realize a function of previously calculating a set route of a cut-through path for a route from the transmission side edge node exceeding the predetermined traffic amount to the reception side edge node.

As a function for calculating the set route,
According to the measurement result of the measuring function, one or more cut-through path setting routes proportional to the traffic amount are calculated in advance for the route from the transmitting side edge node exceeding the predetermined traffic amount to the receiving side edge node. It is also possible to realize the function of putting.

As a function to be actually set, a function to set a plurality of cut-through paths from one transmission side edge node to one reception side edge node is realized, and as a function of the transmission side edge node, a series of It is also possible to realize a function of transferring a plurality of packets forming the burst data in a distributed manner to the plurality of cut-through paths and assigning the sequence numbers before the distribution to the distributed packets.

As a function of calculating the set route,
A function of pre-calculating a set route of a plurality of cut-through paths having different link costs from one of the transmitting-side edge nodes to one of the receiving-side edge nodes, and as the function of actually setting the transmitting-side edge QoS (Quality of Burst Data) of burst data that arrives at a node
It is also possible to realize a function of actually setting a cut-through path in the set path of the link cost corresponding to the Qos class from among the plurality of cut-through paths of different link costs according to the Service class.

As a function for calculating the setting,
A function of pre-calculating a set path of a plurality of cut-through paths from one transmission side edge node to one reception side edge node is realized, and the burst data is transferred in accordance with the burst length of incoming burst data. The set path of the cut-through path to be used is assigned in advance, and as the function of actually setting, the burst length is assigned from the plurality of cut-through paths according to the burst length of the burst data arriving at the transmitting-side edge node. It is also possible to realize the function of actually setting the cut-through path in the setting path.

Alternatively, the program of the present invention is characterized in that, as a function of setting and releasing the cut-through path, a plurality of cut-through paths are set in advance from one of the transmitting-side edge nodes to a plurality of the receiving-side edge nodes. The function of calculating the route, the function of detecting the arrival of the first packet of the burst data to the transmitting side edge node, and the function of calculating the IP address of the first packet detected by the detecting function in advance A function of actually setting two cut-through paths, one of which is the working path and the other of which is the backup path, on different setting paths from the setting paths of the plurality of cut-through paths to the receiving-side edge node corresponding to the IP address. It is about to be realized.

As a function of the transmission side edge node, a function of transferring the same burst data to the working path and the protection path can be realized.

Alternatively, the program of the present invention is characterized in that, as a function of setting and releasing the cut-through path, a plurality of cut-through paths are set in advance from one of the transmitting-side edge nodes to a plurality of the receiving-side edge nodes. The function of calculating the route, the function of detecting the arrival of the first packet of the burst data to the transmitting side edge node, and the function of calculating the IP address of the first packet detected by the detecting function in advance The function of actually setting a cut-through path as a working path in the path from the set paths of a plurality of cut-through paths to the receiving edge node corresponding to the IP address is different from the function of the working path for this working path. Setting a preliminary cut-through path for a route The function of selecting from the set paths of the plurality of cut-through paths that have been calculated, and the setting path of the spare cut-through path selected by the function of selecting when a failure of the working cut-through path occurs. This is to realize the function of actually setting a spare cut-through path.

As functions of the transmitting edge node, a function of transferring burst data to the working path when no failure of the path having the working path is detected, and a failure of the path having the working path set It is desirable to realize a function of transferring burst data to the backup path when is detected.

At this time, a sequence number is given to the packet forming the burst data, and as a function of the receiving-side edge node, when the burst data transferred by the working path is interrupted, the final sequence number is set to the above-mentioned. A function of notifying the transmitting side edge node by a backup path is realized, and as a function of the transmitting side edge node, a function of temporarily storing burst data and burst data stored in the function of temporarily storing the burst data are stored in the backup path. Prior to the transfer, the final sequence number notified from the receiving edge node is referred to, and the packet to which a sequence number next to the final sequence number is given is set as the first packet of burst data to be transferred to the backup path. It is desirable to realize the functions and.

A third aspect of the present invention is a recording medium readable by the information processing device, in which the program of the present invention is recorded. By recording the program of the present invention on the recording medium of the present invention, the information processing apparatus can install the program of the present invention using this recording medium. Alternatively, the program of the present invention can be installed in the information processing apparatus directly from a server holding the program of the present invention via a network.

As a result, the information processing device such as the computer device can save the time for setting the cut-through path and efficiently perform the burst data transfer.

[0041]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a conceptual diagram of an optical communication network according to an embodiment of the present invention. FIG. 2 is a block diagram of the burst data detecting unit and the cut-through path setting / releasing unit according to the embodiment of the present invention. FIG. 3 is a conceptual diagram of an optical communication network in which a cut-through path is set. FIG. 4 is a diagram showing a cut-through path setting table according to the first embodiment of the present invention. FIG. 5 is a diagram showing how a series of burst data is divided. FIG. 6 is a diagram showing how a series of burst data is transferred using a plurality of cut-through paths according to the first embodiment of the present invention.

In the embodiment of the present invention, the transmitting side edge node S and the receiving side edge node R are described separately for the sake of clarity. However, in reality, the edge node functions as a transmitting side. Both functions of the receiver and the receiver are provided, and bidirectional communication can be performed.

According to the present invention, as shown in FIG. 1, a transmission side edge node S accommodating a data transfer source, a reception side edge node R accommodating a data transfer destination, a transmission side edge node S and a reception side edge node. The relay nodes L1 to L4 arranged between the relay node L and the relay node R, and the function of setting and releasing cut-through paths passing through the relay nodes L1 to L4 between the transmission-side edge node S and the reception-side edge node R. Optical communication network. In this embodiment, the function of setting and releasing the cut-through path corresponds to the cut-through path setting / releasing section 10 shown in FIG.
The relay nodes L1 to L4 and the receiving-side edge node R may be provided respectively, or one or a plurality of them may be distributed and arranged in an optical communication network outside the node as a device for collectively managing the cut-through path. Further, the function is a well-known technique, and detailed description thereof will be omitted.

Here, as a feature of the present invention, as shown in FIG. 2, the cut-through path setting / releasing unit 10 is
A set route of a plurality of cut-through paths from one transmission side edge node S to a plurality of reception side edge nodes R is calculated in advance, and the burst data detection unit 3
A burst data arrival detection unit 1 that detects the arrival of the first packet of the burst data to the transmission-side edge node S is provided, and the cut-through path setting release unit 10 determines the IP of the first packet detected by the burst data arrival detection unit 1. The IP is selected from the set routes of the plurality of cut-through paths which are calculated in advance according to the address.
The cut-through path of the route to the receiving edge node R corresponding to the address is actually set.

The header information reading unit 4 reads the header information of the IP packet and notifies the burst data arrival detection unit 1 of it. The burst data arrival detection unit 1 analyzes the header information and recognizes the IP address. When detecting that the cut-through path is in a non-communication state for a predetermined time, the burst data end detection unit 2 determines that the burst data has ended, and releases the cut-through path set for the burst data transfer.

The traffic history collecting unit 11 for measuring the past traffic volume transferred from the transmitting edge node S to the plurality of receiving edge nodes R is provided, and the cut-through path setting releasing unit 10 includes the traffic history collecting unit 11 According to the measurement result of (1), the set route of the cut-through path is calculated in advance for the route to the receiving-side edge node R that exceeds the predetermined traffic amount. The traffic history collected by the traffic history collection unit 11 is
As shown in FIG. 4, it is recorded in the cut-through path setting table for each receiving-side edge node that is the ground (# 2, # 3, # 4, # 5).

At this time, the cut-through path setting / releasing unit 10
According to the measurement result of the traffic history collection unit 11, the route from the transmission-side edge node S exceeding the predetermined traffic amount to the reception-side edge node R is preset with one or more cut-through path setting routes proportional to the traffic amount. Calculate. In the example of FIG. 4, a set route of one cut-through path is calculated when the traffic history is 100 Mb / s or more and less than 200 Mb / s, and a set route of two cut-through paths is calculated when the traffic history is 200 Mb / s. Also, the traffic history is 100 Mb /
If it is less than s, the set route of the cut-through path is not calculated.

Further, the cut-through path setting / releasing unit 10
Therefore, when a plurality of cut-through paths are actually set from one transmitting edge node S to one receiving edge node R, the transmitting edge node S transmits a plurality of packets constituting a series of burst data to each other. Distribute and transfer to multiple cut-through paths. In this case, the distributed packets are given the sequence numbers before being distributed.

That is, by dividing a series of burst data as shown in FIG. 5 and transferring it using a plurality of cut-through paths as shown in FIG. 6, it is possible to avoid biasing the load on one cut-through path. The cut-through path can be used effectively. In the example of FIG. 6, 10
A sequence number is given to the burst data divided into equal parts, and round-robin transfer is performed in order from the smallest sequence number using three cut-through paths from the transmitting-side edge node.

Since the delay characteristics of each cut-through path naturally have variations and the transmission order from the transmission-side edge node does not always match the reception order at the reception-side edge node, it is divided at the reception-side edge node. The sequence is arranged based on the sequence number given to the burst data, and the original series of burst data is reproduced.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. 7 and 8. FIG. 7 is a diagram showing a plurality of cut-through paths having different link costs. FIG. 8 is a flowchart showing the cut-through path selection procedure of the second embodiment. In the second embodiment, as shown in FIG. 7, the cut-through path setting releasing unit 10 preliminarily sets cut-through path setting paths having different link costs from one transmitting-side edge node S to one receiving-side edge node R. The link cost corresponding to the QoS class is calculated from the plurality of cut-through path setting routes having different link costs according to the QoS (Quality of Service) class of the burst data arriving at the transmitting side edge node S. Actually set the cut-through path in the set route.

In the example of FIG. 7, the first cut-through path C1 in which the set route of the transmission side edge node S → relay node L1 → relay node L5 → relay node L4 → reception side edge node R is calculated in advance, and the transmission side Edge node S →
The relay node L1 → relay node L2 → relay node L3 → relay node L4 → the second cut-through path C2 in which the set route of the receiving-side edge node R has been calculated in advance, and the relay node through which the set route of the cut-through path C1 passes The number is three, and the number of relay nodes through which the set route of the cut-through path C2 passes is four. Accordingly, comparing the cut-through path C1 and the cut-through path C2, the cut-through path C1 is the cut-through path C.
The delay time is shorter than 2. Therefore, as shown in FIG. 8, the burst data belonging to the QoS class in which the permissible fluctuation delay time is smaller than the threshold value D is actually set by the cut-through path C1 and transferred. Although this example is an example of a QoS class based on delay time, other various parameters such as transmission capacity or confidentiality can be handled in the same manner.

(Third Embodiment) A third embodiment of the present invention will be described with reference to FIGS. 9 to 11. FIG. 9 is a diagram showing a plurality of cut-through paths set for different burst lengths. FIG. 10 is a flowchart showing the cut-through path selection procedure of the second embodiment. FIG. 11 is a diagram showing the effect of the third embodiment. In the third embodiment, as shown in FIG.
The cut-through path setting / releasing unit 10 calculates in advance the set paths of a plurality of cut-through paths C1 and C2 from one transmitting-side edge node S to one receiving-side edge node R, and according to the burst length of incoming burst data. The set paths of the cut-through paths C1 and C2 used for the transfer of lever burst data are assigned in advance, and as shown in FIG. The cut-through path is actually set from the set paths to the set path assigned to the burst length.

As an effect obtained by this, firstly, the load can be distributed by distributing the cut-through paths for transferring the burst data according to the burst length. Secondly, in the case where each node has a burst buffer for temporarily accumulating burst data, if the burst length is not constant, as shown in FIG. Burst data of various burst lengths is accumulated in the accumulation area, so that a blank invalid area occurs. On the other hand, if the burst length is constant, as shown in FIG. 11 (b), burst data of exactly matching burst length is accumulated in the accumulation area of the burst buffer provided in advance for the burst length. Therefore, the invalid area does not occur, and the capacity of the burst buffer can be effectively used.

(Fourth Embodiment) The fourth embodiment of the present invention is shown in FIG.
This will be described with reference to FIGS. 3 and 12. FIG. 12 is a diagram showing a state of an optical communication network in which working and protection cut-through paths are set. In the fourth embodiment, as shown in FIG. 3, the cut-through path setting / releasing unit 10 calculates in advance the set paths of a plurality of cut-through paths from one transmitting-side edge node S to a plurality of receiving-side edge nodes R. 2, a burst data arrival detection unit 1 for detecting the arrival of the first packet of burst data to the transmission side edge node S is provided, and as shown in FIG. Among the set paths of the plurality of cut-through paths that are calculated in advance according to the detected IP address of the first packet, one is set as the working path and the other is set as the different set path from the reception side edge node R corresponding to the IP address. The two cut-through paths C1 and C2 to be the preliminary paths are actually set. Further, as shown in FIG. 12, the transmission-side edge node S transfers the same burst data B1 to the working path and the protection path.

As a result, the burst data B1 is normally transferred from the transmitting side edge node S to the receiving side edge node R even when a failure occurs in the route in which the cut-through path C1 or C2 is set.

(Fifth Embodiment) The fifth embodiment of the present invention is shown in FIG.
This will be described with reference to FIGS. 3, 13, 14 and 15. FIG. 13 is a diagram showing an optical communication network in which a working cut-through path and a backup cut-through path are set. FIG. 14 is a diagram for explaining the operation immediately after the failure occurs in the working path. FIG. 15 is a diagram for explaining an operation in which burst data is retransmitted using a backup path.

In the fifth embodiment, as shown in FIG. 3, the cut-through path setting / releasing unit 10 shown in FIG. 2 sets a plurality of cut-through paths from one transmitting-side edge node S to a plurality of receiving-side edge nodes R in advance. A burst data arrival detection unit 1 for detecting the arrival of the first packet of the burst data to the transmission side edge node S is provided in advance, and the burst data arrival detection unit 1 is provided as shown in FIG. I of the detected first packet
The cut-through path C1 is actually set as a working path in the set path from the plurality of cut-through path setting paths calculated in advance according to the P address to the receiving-side edge node R corresponding to the IP address, and this working path is used. The cut-through path C2, which should be the backup path for this working path having a different setting path from the path, is selected in advance from the plurality of pre-calculated cut-through path setting paths, and the working path failure occurs. When it occurs, the working path is switched to the cut-through path C2 that should be the backup path that has been selected.

In the fifth embodiment, the transmitting edge node S
Transfers burst data to the working path when no fault is detected in the route in which the working path is set. When a failure in the path in which the working path is set is detected, the protection path is actually set and then burst data is transferred. As a result, compared with the fourth embodiment, in normal times, burst data is transferred only by the working path, so that wavelength resources can be effectively used.

Further, a sequence number is given to the packet forming the burst data, and the receiving edge node R, as shown in FIG. 14, when the burst data transferred by the working path is interrupted, its final sequence is terminated. The transmission side edge node S is notified of the number by the backup path, and the transmission side edge node S transfers the burst data temporarily stored in the burst buffer 20 and the burst data stored in the burst buffer 20 to the backup path. In reference to the final sequence number notified from the receiving-side edge node R prior to the above, as shown in FIG. 15, a burst for transferring a packet having a sequence number next to the final sequence number to the backup path. It is the first packet of data.

(Sixth Embodiment) The optical communication network of the present invention can be realized by using a computer device as an information processing device. That is, by installing in a computer device, as shown in FIG. 2, a cut-through path passing through the transmitting-side edge node S, the relay nodes L1 to L4, and the receiving-side edge node R in the optical communication network is set in the computer device. As a function corresponding to the cut-through path setting / releasing unit 10 for releasing, as shown in FIG. 3, setting paths of a plurality of cut-through paths from one transmitting-side edge node to a plurality of receiving-side edge nodes R are calculated in advance. A function and a function corresponding to the burst data arrival detection unit 1 that detects the arrival of the first packet of the burst data to the transmission side edge node S;
IP of the first packet detected by this detecting function
A function of actually setting a cut-through path in a set route from the set routes of the plurality of cut-through paths calculated in advance according to an address to the receiving-side edge node R corresponding to the IP address. The optical communication network of the present invention can be realized by using this computer device by installing the above program in the computer device.

Further, the program of the present invention realizes, as the function of the transmitting-side edge node S, the function of measuring the past traffic volume for each of the plurality of receiving-side edge nodes R, and calculates the set route. As
As shown in FIG. 4, according to the measurement result of the measuring function, a function of pre-calculating a cut-through path setting route for a route from the transmitting side edge node exceeding the predetermined traffic amount to the receiving side edge node is provided. make it happen.

Alternatively, the program of the present invention has, as a function corresponding to the cut-through path setting / releasing unit 10, the traffic to the path to the receiving edge node R which exceeds a predetermined traffic amount according to the measurement result of the measuring function. It realizes the function of setting the setting route of one or more cut-through paths in proportion to the amount in advance.

Alternatively, the program of the present invention realizes the function of setting a plurality of cut-through paths from one transmitting-side edge node S to one receiving-side edge node R as a function corresponding to the cut-through path setting / releasing unit 10. As shown in FIGS. 5 and 6, the function of the transmission-side edge node S is to realize a function of distributing and transferring a plurality of packets forming a series of burst data to the plurality of cut-through paths. A sequence number before being distributed is given to each of the distributed packets.

Alternatively, the program of the present invention, as shown in FIG. 7 and FIG.
As a function corresponding to 0, one transmitting-side edge node S
From this, one receiving-side edge node R realizes a function of preliminarily calculating a set route of cut-through paths having different link costs, and as a function of the transmitting-side edge node S, QoS (Quality of QoS) of incoming burst data is
Service) to realize a function of actually setting the cut-through path C1 or C2 in the set path of the link cost corresponding to the QoS class from among the set paths of the cut-through paths C1 and C2 of different link costs according to the Service class. .

Alternatively, the program of the present invention, as shown in FIGS. 9 and 10, has a plurality of functions from one transmitting-side edge node S to one receiving-side edge node R as a function corresponding to the cut-through path setting / releasing unit 10. The cut-through path setting route is realized in advance, and the cut-through path setting route used for the transfer of this burst data is pre-assigned according to the burst length of the incoming burst data, and as the function to actually set, Depending on the burst length of the burst data arriving at the transmitting edge node S, a plurality of cut-through paths C1, C
A function of actually setting the cut-through path C1 or C2 from the two setting paths to the setting path assigned to the burst length is realized.

Alternatively, the program of the present invention is as shown in FIG.
As shown in FIG. 5, the receiving-side edge corresponding to the IP address is selected from among the plurality of cut-through path setting routes that are calculated in advance according to the IP address of the first packet detected by the function corresponding to the burst data arrival detection unit 1. Two cut-through paths C, one of which is the working path and the other of which is the backup path, in different set routes to the node
And the function of actually setting 1 and C2. In this case, the program of the present invention realizes, as the function of the transmission-side edge node S, the function of transferring the same burst data B1 to the working path and the protection path.

Alternatively, the program of the present invention is as shown in FIG.
As shown in FIG. 5, the receiving-side edge corresponding to the IP address is selected from among the plurality of cut-through path setting routes that are calculated in advance according to the IP address of the first packet detected by the function corresponding to the burst data arrival detection unit 1. The function of actually setting the cut-through path C1 as the working path on the path to the node R, and a plurality of pre-calculated setting paths for the spare cut-through path C2 for the working path that is different from the working path Of the set path of the cut-through path, and a spare cut-through path is actually set in the set path of the spare cut-through path C2 selected by the function of selecting when the failure of the working path occurs. It realizes the function to set.

Alternatively, the program of the present invention has, as the functions of the transmitting-side edge node S, a function of transferring burst data to the working path when no failure is detected in the route in which the working path is set, and a function of the working path. And a function of transferring burst data to the protection path when a failure of the path set to is detected.

At this time, the program of the present invention is executed as shown in FIG.
As shown in FIG. 15 and FIG. 15, a sequence number is given to the packet forming the burst data, and as a function of the receiving-side edge node R, when the burst data transferred by the working path is interrupted, its final sequence number is set as The burst buffer 2 that realizes the function of notifying the transmitting-side edge node S by the backup path and temporarily stores the burst data as the function of the transmitting-side edge node S
The last sequence number notified from the receiving edge node R prior to transferring the burst data accumulated in the function corresponding to 0 and the function corresponding to the burst buffer 20 to the backup path is referred to and the last sequence number is referred to. The function of using the packet to which the sequence number next to the sequence number is given as the first packet of the burst data to be transferred to the backup path is realized.

Since the program of the present invention is recorded in the recording medium of the present invention, the computer device can install the program of the present invention using this recording medium. Alternatively, the program of the present invention can be installed in the computer device directly from a server holding the program of the present invention via a network.

As a result, the computer device can realize an optical communication network which saves time for setting a cut-through path and can efficiently perform burst data transfer.

[0073]

As described above, according to the present invention,
Burst data transfer can be performed efficiently by saving time for setting the cut-through path.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of an optical communication network according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of a burst data detection unit and a cut-through path setting / releasing unit according to the embodiment of the present invention.

FIG. 3 is a conceptual diagram of an optical communication network in which a cut-through path is set.

FIG. 4 is a diagram showing a cut-through path setting table according to the first embodiment of the present invention.

FIG. 5 is a diagram showing how a series of burst data is divided.

FIG. 6 is a diagram showing how a series of burst data is transferred using a plurality of cut-through paths according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a plurality of cut-through paths having different link costs.

FIG. 8 is a flowchart showing a cut-through path selection procedure of the second embodiment.

FIG. 9 is a diagram showing a plurality of cut-through paths set for different burst lengths.

FIG. 10 is a flowchart showing a cut-through path selection procedure of the second embodiment.

FIG. 11 is a diagram showing the effect of the third embodiment.

FIG. 12 is a diagram showing a state of an optical communication network in which working and protection cut-through paths are set.

FIG. 13 is a diagram showing a state of an optical communication network in which an active cut-through path and a backup cut-through path are set.

FIG. 14 is a diagram for explaining an operation immediately after a failure occurs in the working path.

FIG. 15 is a diagram for explaining an operation in which burst data is retransmitted using a backup path.

[Explanation of symbols]

1 Burst data arrival detector 2 Burst data end detector 3 Burst data detector 4 Header information reading unit 10 Cut-through path setting release section 11 Traffic history collection section 20 burst buffer B1 burst data C1, C2 cut-through path L1 to L4 relay nodes R receiving edge node S Sending edge node

Continued front page    (72) Inventor Eiji Oki             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation F term (reference) 5K030 HA08 JL03 LB05 LB11 MD02

Claims (23)

[Claims] 1. A transmission-side edge node accommodating a data transfer source, a reception-side edge node accommodating a data transfer destination, and a relay node arranged between the transmission-side edge node and the reception-side edge node. In the optical communication network including means for setting and releasing a cut-through path passing through the relay node between the transmitting-side edge node and the receiving-side edge node, the means for setting and releasing the cut-through path is Detecting arrival of the first packet of burst data to the transmitting edge node, comprising means for calculating in advance the set paths of a plurality of cut-through paths from the one transmitting edge node to the plurality of receiving edge nodes. Means for providing the IP of the first packet detected by the detecting means.
An optical device comprising means for actually setting a cut-through path of a path from the set paths of the plurality of cut-through paths calculated in advance according to addresses to the receiving-side edge node corresponding to the IP address. Communication network. 2. A means for measuring the past traffic volume transferred from the transmission-side edge node to a plurality of the reception-side edge nodes, respectively, and the means for calculating the set route has a function of the measuring means. 2. The optical communication network according to claim 1, further comprising means for calculating in advance a set route of a cut-through path for a route from the edge node on the transmitting side to the edge node on the receiving side which exceeds a predetermined traffic amount according to the measurement result. 3. The means for calculating the set route is configured so that the traffic amount for a route from the edge node on the transmitting side to the edge node on the receiving side that exceeds a predetermined traffic amount according to the measurement result of the measuring means. The optical communication network according to claim 2, further comprising means for calculating in advance one or more cut-through path setting routes proportional to the above. 4. The means for actually setting comprises means for setting a plurality of cut-through paths from one of the transmitting side edge nodes to one of the receiving side edge nodes, wherein the transmitting side edge node has a series of bursts. 4. A means for distributing a plurality of packets constituting data to a plurality of cut-through paths in a distributed manner and transferring the plurality of cut-through paths, wherein each of the distributed packets is given a sequence number before being distributed. Optical communication network. 5. The means for calculating the set route preliminarily calculates the set route of a plurality of cut-through paths having different link costs from one transmission side edge node to one reception side edge node. And the means for actually setting is a QoS (Quality of Service) of burst data arriving at the transmitting-side edge node.
4. The optical communication network according to claim 3, further comprising means for actually setting a cut-through path to a link-cost setting path corresponding to the Qos class from among the plurality of cut-through paths having different link costs according to the class. 6. The means for calculating the set route comprises means for calculating a set route of a plurality of cut-through paths from one of the transmitting side edge nodes to one of the receiving side edge nodes in advance. According to the burst length of the burst data, the setting path of the cut-through path used for the transfer of this burst data is pre-assigned, and the means for actually setting is according to the burst length of the burst data arriving at the edge node on the transmitting side. The optical communication network according to claim 3, further comprising means for actually setting a cut-through path to a set path assigned to the burst length from among the set paths of the plurality of cut-through paths. 7. A transmission-side edge node accommodating a data transfer source, a reception-side edge node accommodating a data transfer destination, and a relay node arranged between the transmission-side edge node and the reception-side edge node. In the optical communication network including means for setting and releasing a cut-through path passing through the relay node between the transmitting-side edge node and the receiving-side edge node, the means for setting and releasing the cut-through path is Detecting arrival of the first packet of burst data to the transmitting edge node, comprising means for pre-calculating a set route of a plurality of cut-through paths from one transmitting edge node to a plurality of receiving edge nodes. Means for providing the IP of the first packet detected by the detecting means.
Two cut-through paths, one of which is the working path and the other of which is the backup path, among different setting paths from the setting paths of the plurality of cut-through paths calculated in advance according to addresses to the receiving-side edge node corresponding to the IP address. An optical communication network comprising means for actually setting each. 8. The optical communication network according to claim 7, wherein the edge node on the transmission side comprises means for transferring the same burst data to the working path and the protection path. 9. A transmission-side edge node accommodating a data transfer source, a reception-side edge node accommodating a data transfer destination, and a relay node arranged between the transmission-side edge node and the reception-side edge node. In the optical communication network including means for setting and releasing a cut-through path passing through the relay node between the transmitting-side edge node and the receiving-side edge node, the means for setting and releasing the cut-through path is Detecting arrival of the first packet of burst data to the transmitting edge node, comprising means for pre-calculating a set route of a plurality of cut-through paths from one transmitting edge node to a plurality of receiving edge nodes. Means for providing the IP of the first packet detected by the detecting means.
Means for actually setting as a working path the cut-through path of the set route from the set routes of the plurality of cut-through paths calculated in advance according to the address to the receiving-side edge node corresponding to the IP address; A means for selecting a preset cut-through path setting route of a route different from the working path from among the plurality of pre-calculated cut-through path setting routes, and a failure of the working cut-through path An optical communication network, characterized in that it comprises means for actually setting a spare cut-through path on the setting path of the spare cut-through path selected by the means for selecting. 10. The transmitting-side edge node transfers burst data to the working path when a failure of the path on which the working path is set is not detected, and a failure on the path on which the working path is set. 10. The optical communication network according to claim 7, further comprising means for transferring burst data to the protection path when is detected. 11. A sequence number is given to a packet forming the burst data, and when the burst data transferred by the working path is interrupted, the receiving edge node gives the final sequence number by the backup path. And a means for notifying the transmission side edge node, wherein the transmission side edge node has means for temporarily storing burst data, and means for transferring the burst data accumulated by the means for temporarily storing the burst data to the backup path. A means for referring to the last sequence number notified from the receiving edge node and using a packet to which a sequence number next to the last sequence number is given as a head packet of burst data to be transferred to the backup path. 10. The optical communication network according to 10. 12. A function for setting and releasing a cut-through path that passes through a transmission-side edge node, a relay node, and a reception-side edge node in an optical communication network by installing the information processing device in advance, A function of calculating a set route of a plurality of cut-through paths from one transmission side edge node to a plurality of reception side edge nodes, and a function of detecting arrival of a leading packet of burst data to the transmission side edge node , IP of the first packet detected by this detecting function
And a function of actually setting a cut-through path on a path from the plurality of cut-through path setting paths calculated in advance according to an address to the receiving-side edge node corresponding to the IP address. program. 13. A function of measuring the past traffic volume transferred from the transmission-side edge node to a plurality of reception-side edge nodes, respectively, and calculating the set route, the measurement function. 13. The program according to claim 12, which realizes a function of pre-calculating a set path of a cut-through path for a path from the transmission-side edge node that exceeds a predetermined traffic amount to the reception-side edge node according to the measurement result. 14. A function of calculating the set route, the traffic amount of a route from the transmission-side edge node to the reception-side edge node exceeding a predetermined traffic amount according to the measurement result of the measuring function. 13. The program according to claim 12, which realizes a function of previously calculating a set route of one or more cut-through paths in proportion to. 15. As a function of the actual setting, a function of setting a plurality of cut-through paths from one transmission side edge node to one reception side edge node is realized, and as a function of the transmission side edge node, A method for realizing a function of distributing a plurality of packets constituting a series of burst data to the plurality of cut-through paths and transferring the plurality of cut-through paths, each of which has a sequence number before being distributed. 12. The program according to 12. 16. A function of preliminarily calculating a setting route of a plurality of cut-through paths having different link costs from one transmitting side edge node to one receiving side edge node as a function of calculating the setting route. As a function of actually setting the QoS (Quality of QoS) of burst data that arrives at the function of the edge node on the transmitting side.
13. The function for actually setting a cut-through path to a link-cost setting path corresponding to the Qos class from among the plurality of cut-through path setting paths having different link costs according to the f Service) class. program. 17. As a function of calculating the set route, a function of pre-calculating a set route of a plurality of cut-through paths from one of the transmitting side edge nodes to one of the receiving side edge nodes comes and comes. A set path of a cut-through path used for the transfer of the burst data is pre-assigned according to the burst length of the burst data, and the function to actually set is the function according to the burst length of the burst data arriving at the transmission side edge node. 13. The program according to claim 12, which realizes a function of actually setting a cut-through path to a set path assigned to the burst length from among the set paths of a plurality of cut-through paths. 18. As a function of setting and releasing a cut-through path passing through a transmission-side edge node, a relay node, and a reception-side edge node in an optical communication network by installing the information processing device in advance, A function of calculating a set route of a plurality of cut-through paths from one transmission side edge node to a plurality of reception side edge nodes, and a function of detecting arrival of a leading packet of burst data to the transmission side edge node , IP of the first packet detected by this detecting function
Two cut-through paths, one of which is the working path and the other of which is the backup path, among different setting paths from the setting paths of the plurality of cut-through paths calculated in advance according to addresses to the receiving-side edge node corresponding to the IP address. A program that realizes the function of actually setting each. 19. The program according to claim 18, wherein a function of transferring the same burst data to the working path and the protection path is realized as a function of the transmission side edge node. 20. As a function of setting and releasing a cut-through path passing through a transmission-side edge node, a relay node, and a reception-side edge node in an optical communication network by installing in the information processing device, A function of calculating a set route of a plurality of cut-through paths from one transmission side edge node to a plurality of reception side edge nodes, and a function of detecting arrival of a leading packet of burst data to the transmission side edge node , IP of the first packet detected by this detecting function
A function of actually setting a cut-through path as a working path on a path from the plurality of cut-through path setting paths calculated in advance according to an address to the receiving-side edge node corresponding to the IP address, and the working path. A function of selecting a preset cut-through path setting route of a route different from the working path from among the plurality of pre-calculated cut-through path setting routes, and a failure of the working cut-through path A program, which sometimes realizes a function of actually setting a spare cut-through path on a setting path of the spare cut-through path selected by the function to be selected. 21. A function of the transmitting-side edge node, a function of transferring burst data to the working path when a failure of the path on which the working path is set is not detected, and the path on which the working path is set. 21. The program according to claim 18 or 20, which realizes a function of transferring burst data to the backup path when the fault of 1 is detected. 22. A sequence number is given to a packet forming the burst data, and as a function of the receiving-side edge node, when the burst data transferred by the working path is interrupted, its final sequence number is set as the backup path. The function of notifying the edge node on the transmitting side is realized by the function of the edge node on the transmitting side, and the function of temporarily storing burst data and the burst data accumulated in the function of temporarily storing are transferred to the backup path. Prior to the above, referring to the final sequence number notified from the receiving edge node, a packet having a sequence number next to the final sequence number is set as the first packet of burst data to be transferred to the backup path, and The program according to claim 21, which realizes the following. 23. A recording medium readable by the information processing device, in which the program according to claim 12 is recorded.