JP3681697B2 - Optical path network and node, program and recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is used for setting a cut-through path in optical burst data transfer.
[0002]
[Prior art]
In data transfer in an IP (Internet Protocol) network, a node reads header information of an IP packet and transfers the IP packet to the destination route. This is repeated between a plurality of nodes, and as a result, the IP packet reaches a desired destination. In such an IP packet transfer method, since transfer is performed in units of individual IP packets, it is necessary to read the header information of each individual IP packet.
[0003]
On the other hand, recently, the demand for a series of large-volume data transfer such as moving image data is rapidly increasing. Such a large amount of data is called burst data, and is divided into a large number of IP packets. For such burst data transfer, it is inefficient to transfer individual IP packets, so a cut-through path is set between specific nodes. In this cut-through path, the IP packet Transfer is performed at once without reading the header information. This is particularly effective for data transfer using an optical path.
[0004]
In other words, in data transfer using an optical path in a transmission path between nodes, each node temporarily converts an optical signal that has arrived through the optical path into an electric signal, reads IP packet header information, After determining the path, it is necessary to convert it into an optical signal and send it again to the optical path. On the other hand, in data transfer using a cut-through path based on a wavelength path, it is not necessary to convert an optical signal into an electrical signal in order to read header information, and the optical signal can be transferred as it is from the start point to the end point of the cut-through path. Very efficient burst data transfer can be performed.
[0005]
[Problems to be solved by the invention]
Thus, although it is an optimal cut-through path for burst data transfer using a wavelength path, a process for setting a cut-through path in advance prior to burst data transfer is required.
[0006]
That is, a request for setting a cut-through path is sent from the originating node to the terminating node. The request packet in which this request is stored is an IP packet, and reaches the destination node while reading the header information at each node. In the middle of this, if it is difficult to set a cut-through path due to a shortage of network resources, a signal for notifying the fact is sent to the originating node. In response, the originating node either retries the cut-through path setting or gives up.
[0007]
The cut-through path is preferably connected from the originating node to the terminating node, but depending on the distance between the originating node and the terminating node, optical signal loss or cross Signal quality degradation due to talk becomes significant, and 3R (Reshaping, Retiming, Regenerating) processing may be required in any node, and it is necessary to calculate which node performs 3R processing.
[0008]
In this way, the cut-through path itself is optimal for burst data transfer, but the user who is the data transmission source secures network resources in consideration of the amount of data that he / she intends to transmit in the future, and cuts out the path. There is a problem that it takes time and effort to set.
[0009]
In addition, after the cut-through path is successfully set and burst data transfer is performed, the cut-through path is released, but unless the user who is the transmission source sends a release request, the cut-through path is not released, There is a possibility that invalid hold of the cut-through path is performed.
[0010]
The present invention is made in such a background, and it is intended to provide a node, an optical path network, a program, and a recording medium that can reduce labor and time required for setting a cut-through path and invalid hold. Objective.
[0011]
In this specification, the originating side node and the terminating side node are referred to as the originating side node that sends a path setting request prior to data transfer, and the termination destination node of this request. This is called the destination node. When transferring data after setting a path, either the originating node or the terminating node can be the data source or the data destination. The set path may be a unidirectional path or a bidirectional path.
[0012]
[Means for Solving the Problems]
The present invention is characterized in that it is not necessary to set a cut-through path prior to burst data transfer. Further, the present invention is characterized in that the cut-through path is released promptly when burst data transfer is completed.
[0013]
Furthermore, according to the present invention, a plurality of AONs (All Optical Networks) closed under a policy that 3R processing is not required are configured by a plurality of nodes, and these are connected appropriately, thereby enabling simple and short time. A desired cut-through path is set in In other words, 3R processing is not required in one AON, and 3R processing can be performed at the edge nodes connecting the AONs. This eliminates the need for a procedure for calculating in advance the location to which 3R is applied, thereby reducing the labor and time required for setting a cut-through path, and invalid hold.
[0014]
That is, the first aspect of the present invention is an optical path network, and the feature of the present invention is that a plurality of nodes each have a plurality of AONs closed under a policy that 3R processing is not required. The node comprises means for setting an optical path according to the IP address of an incoming IP packet, and the means for setting the optical path includes means for detecting the arrival of the first packet of burst data, and this detection. When the arrival of the first packet of burst data is detected by the means, the cut-through path setting means for setting the cut-through path to the next node, the means for detecting the arrival of the last packet of burst data, and the means for detecting the burst When the arrival of the last packet of data is detected, the cut-through path that has already been set A cut-through path releasing unit that releases after the last packet passes, the cut-through path setting unit determining whether or not a cut-through path can be set up to the next node, and a determination result of the determining unit is not settable In some cases, the AON includes means for temporarily storing incoming burst data, and IP transfer means for individually transferring individual packets constituting the burst data stored in the temporary storage means according to the IP address. The cut-through path setting means in the node corresponding to the edge node of the node determines whether or not a cut-through path can be set up to the first node corresponding to the edge node of another adjacent AON, and the determination of the determination means If the result is not configurable, the second corresponding to the other AON edge node It is in place and a sequentially try means the setting of the cut-through path to the subsequent node.
[0015]
As described above, the present invention does not set the cut-through path in advance, but sets the cut-through path to the point where it can be set together with the burst data transfer, and when the setting of the cut-through path becomes difficult, the IP transfer It is characterized by switching to. As a result, the present invention is characterized in that it is not necessary to set the cut-through path prior to burst data transfer, and the labor and time required for setting the cut-through path can be reduced.
[0016]
Furthermore, according to the present invention, a cut-through path is set from one AON to another AON, and finally a cut-through path is set between the originating node and the terminating node. At this time, since the 3R processing is performed at any of the AON edge nodes, it is not necessary to calculate in advance the location where the 3R processing is performed.
[0017]
The subsequent burst data amount information is written as the header information of the head packet, and the means for detecting the arrival of the head packet detects the head packet of the burst data with reference to the subsequent burst data amount information. Can be provided. The burst data amount information is, for example, packet number information or packet length information following the head packet.
[0018]
In addition, information indicating that the packet is the last packet of burst data is written as the header information of the last packet, and the means for detecting the arrival of the last packet displays that the packet is the last packet. Means for detecting the last packet of burst data with reference to the information may be provided.
[0019]
As a result, the present invention is characterized in that the cut-through path is released immediately after the burst data transfer is completed, and the number of invalid suspensions of the cut-through path can be reduced.
[0020]
The means for determining whether or not the setting is possible includes means for determining whether or not there is a free wavelength for setting a cut-through path to the next-stage node, and determines whether or not the setting corresponding to an AON edge node is possible. The determination means includes the presence / absence of a free wavelength for setting a cut-through path to the next node corresponding to the edge node of the other AON, the allowable transfer rate to the own node, and the allowable to the next node. It is desirable to provide means for determining the difference from the transfer rate.
[0021]
The node, for example, means for sending a signal quality test packet to another node, means for returning its own ID to the packet sender when this packet is received without signal quality degradation, and this reply AON used in the present invention can be configured by providing a means for calculating an area that does not require 3R processing according to the ID.
[0022]
A second aspect of the present invention is an AON configuration method, which is characterized in that a signal quality test packet is transmitted from one node to another node and the packet is received without signal quality deterioration. The node returns its own ID to the node, and the node checks the area that does not require the 3R processing by receiving this reply, and the AON closed under the policy that the 3R processing is not required. There is a place to compose. For example, the AON is virtually configured, and a different AON is virtually configured for each source node.
[0023]
The third aspect of the present invention is a node, and the feature of the present invention is that the IP address of an incoming IP packet provided in a plurality of AONs closed under the policy that 3R processing is not required The optical path setting means includes means for detecting the arrival of the first packet of burst data, and means for detecting the arrival of the first packet of burst data by the detecting means. Cut-through path setting means for setting the cut-through path to the next node, means for detecting the arrival of the last packet of burst data, and setting when the arrival of the last packet of burst data is detected by this detecting means A cut-through path releasing means for releasing the cut-through path that has been passed after the final packet has passed. The cut-through path setting means is means for determining whether or not a cut-through path can be set up to the next-stage node, and means for temporarily storing incoming burst data when the determination result of the determination means is not settable. And IP transfer means for individually transferring individual packets constituting the burst data stored in the temporarily storing means according to the IP address thereof, and the cut-through path in the node corresponding to the edge node of the AON The setting means determines whether or not a cut-through path can be set up to a first node corresponding to an adjacent edge node of another AON, and if the determination result of the determination means cannot be set, the adjacent other Means for sequentially trying to set cut-through paths to second and subsequent nodes corresponding to AON edge nodes In the place with.
[0024]
A means for sending a signal quality test packet to another node, a means for returning its own ID to the packet sending source when this packet is received without signal quality degradation, and a 3R process according to the returned ID It is desirable to provide means for calculating areas that are not required.
[0025]
A fourth aspect of the present invention is a program, and the feature of the present invention is that the information processing apparatus is closed under a policy that the information processing apparatus does not require 3R processing by being installed in the information processing apparatus. As a function corresponding to a device that controls nodes provided in a plurality of AONs, a function for setting an optical path according to an IP address of an incoming IP packet is realized, and a function for setting this optical path is as follows. A function for detecting the arrival of the first packet, and when the arrival of the first packet of burst data is detected by this function, a cut-through path setting function for setting a cut-through path to the next node, and a last packet of burst data The function to detect the arrival and the function to detect the arrival of the last packet of burst data When it is issued, it realizes a cut-through path release function that releases the already set cut-through path after passing the final packet, and determines whether the cut-through path can be set up to the next node as the cut-through path setting function. The function to temporarily store the burst data that arrives when the determination result of this determination function is not settable, and the IP address of each packet constituting the burst data stored in the function to temporarily store In accordance with the IP forwarding function for forwarding individually according to the cut-through path to the first node corresponding to the adjacent edge node of another AON as the cut-through path setting function in the node corresponding to the edge node of the AON Of the function to determine whether or not to set the If a constant result is not set there is to be realized and a function to attempt to set a cut-through path to the second and subsequent nodes corresponding to the edge node of the other AON adjacent sequentially.
[0026]
A function for sending a signal quality test packet to another node, a function for returning its own ID to the packet sending source when this packet is received without signal quality deterioration, and a 3R process according to this returned ID It is desirable to realize a function for calculating an area that is not required.
[0027]
A fifth aspect of the present invention is the information processing apparatus-readable recording medium on 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 directly installed in the information processing apparatus via a network from a server holding the program of the present invention.
[0028]
Accordingly, it is possible to realize a node and an optical path network that can reduce the labor, time, and invalid hold required for setting a cut-through path by using an information processing apparatus such as a computer apparatus.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
A node and an optical path network according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of an optical path network according to the present embodiment. FIG. 2 is a block diagram of the optical path setting unit of this embodiment. FIG. 3 is a block diagram of the cut-through path setting unit of this embodiment. FIG. 4 is a block diagram of the burst head packet of this embodiment. FIG. 5 is a block diagram of the burst last packet of this embodiment. FIG. 6 is a block diagram of the node of this embodiment. FIG. 7 is a diagram for explaining the AON configuration procedure.
[0030]
This embodiment is an optical path network, and the feature of this embodiment is that, as shown in FIG. 1, a plurality of nodes are closed by a plurality of AONs based on a policy that 3R processing is not required. As shown in FIG. 2, each node includes an optical path setting unit 1 that sets an optical path according to the IP address of an incoming IP packet. The optical path setting unit 1 includes a head of burst data. A burst data head detection unit 11 that detects the arrival of a packet, and a cut-through path setting unit 12 that sets a cut-through path to the next node when the burst data head detection unit 11 detects the arrival of the first packet of burst data. A burst data end detector 13 for detecting the arrival of the last packet of burst data, and the burst data end detector 3, when the arrival of the last packet of burst data is detected, the cut-through path releasing unit 14 releases the already set cut-through path after passing through the final packet. The cut-through path setting unit 12 is shown in FIG. As described above, the cut-through path setting availability determination unit 22 that determines whether or not the cut-through path can be set up to the next-stage node, and the burst data that arrives when the determination result of the cut-through path setting availability determination unit 22 cannot be set. A burst data buffer 24 that temporarily stores data, and an IP transfer unit 25 that individually transfers individual packets constituting the burst data stored in the burst data buffer 24 according to the IP address thereof. Cut-through path setting at the corresponding node 12 determines whether or not a cut-through path can be set up to a first node corresponding to an adjacent edge node of another AON, and if this determination result cannot be set, it corresponds to an edge node of the adjacent other AON. There is a place to sequentially try to set cut-through paths to the second and subsequent nodes.
[0031]
As shown in FIG. 4, the subsequent burst data amount information is written as the header information of the head packet, and the burst data head detection unit 11 refers to the subsequent burst data amount information to refer to the head packet of the burst data. Is detected. The burst data amount information is packet number information or packet length information following the head packet.
[0032]
As shown in FIG. 5, information indicating that the packet is the last packet of burst data is written as the header information of the last packet, and the burst data end detection unit 13 indicates that this packet is the last packet. The last packet of burst data is detected with reference to the information to be displayed.
[0033]
The cut-through path setting availability determination unit 22 determines whether there is a free wavelength for setting a cut-through path to the next node, and the cut-through path setting availability determination unit 22 of a node corresponding to an AON edge node Whether there is a vacant wavelength for setting a cut-through path to the next node corresponding to the AON edge node, and the difference between the allowable transfer rate to the own node and the allowable transfer rate to the next node. Judge each one.
[0034]
As shown in FIG. 6, the node sends a signal quality test packet sending unit 29 that sends a signal quality test packet to another node. A signal quality determining unit 30 and a signal quality notifying unit 31 that reply to the transmission source, and an area calculating unit 32 that calculates an area that does not require 3R processing according to the returned ID.
[0035]
Next, a cut-through path setting procedure in the optical path network of the present embodiment will be described with reference to FIGS. As shown in FIG. 7, the originating node G1 sends a signal quality test packet from the signal quality test packet sending unit 29 shown in FIG. To G13. This signal quality test packet is a notification packet having no specific destination.
[0036]
The signal quality test packet is received by each of the nodes G2 to G13, and the signal quality determination unit 30 determines the signal quality. The nodes G2 to G7 are determined to have signal quality that does not require 3R processing, and the nodes G8 to G13 are determined to have signal quality that requires 3R processing. When it is determined that the signal quality does not require 3R processing, the signal quality notification unit 31 notifies the node G1 to that effect. As a result, the area calculation unit 32 of the node G1 performs area calculation based on notifications from the nodes G2 to G7. Thereby, it can be seen that the AON including the node G1 is configured by the nodes G2 to G7. In this way, the AON including the own node is specified.
[0037]
In FIG. 7, in order to make the explanation easy to understand, an example in which the signal quality deteriorates as the distance from the node G1 increases. However, in actuality, crosstalk and light are not affected regardless of the distance from the node G1. Signal quality may deteriorate due to fiber bonding failure and various other factors.
[0038]
In the example of FIG. 1, a cut-through path is set between the originating node A and the terminating node I. The originating node A is included in AON # 1, the terminating node I is included in AON # 3, and AON # 2 relays between AON # 1 and AON # 3. The originating node A transfers the burst data to the node B or C which is the edge node of AON # 1.
[0039]
To explain an example in which node C receives burst data, node C attempts to set a cut-through path indicated by a broken line for node E, which is an edge node of AON # 2. When the cut-through path setting indicated by the broken line from node C to E is successful, the cut-through path indicated by the broken line is set from node E to node I. When the cut-through path setting indicated by the broken line from node C to E fails, node C tries to set the cut-through path indicated by the alternate long and short dash line to node D. When the setting of the cut-through path indicated by the one-dot chain line from the node C to the node D is successful, the cut-through path indicated by the one-dot chain line from the node D to the node I is set.
[0040]
Further, when both the nodes D and E fail to set the cut-through path at the node C, an attempt is made to set a cut-through path for another edge node of AON # 2. Alternatively, if both the nodes D and E fail to set the cut-through path at the node C, the node C notifies the node A to that effect, and the node A sends burst data to the node B. It is also possible to set a cut-through path indicated by a solid line from node B to node D.
[0041]
In this embodiment, when every cut-through path setting fails, burst data is accumulated in the burst data buffer 24 via the switch 21 at the edge node, and the IP transfer unit 25 performs IP transfer. Is done. Even during the IP transfer, the setting unit 23 retries to set the cut-through path. If the cut-through path is successfully set, the burst data stored in the burst data buffer 24 is transferred via the switch 27 to the cut-through path. Is sent out. At this time, if the speed conversion is necessary, the speed conversion unit 26 can perform the speed conversion.
[0042]
The AON configuration shown in FIG. 1 is an example in the case where the node A is the originating node, but when another node becomes the originating node, the AON configuration is different from that in FIG. Therefore, the AON configuration shown in FIG. 1 is virtually configured, and a different AON is virtually configured for each source node.
[0043]
The node and the optical path network of the present embodiment can be realized by using a computer device that is an information processing device. In other words, when installed in a computer device, the IP device that arrives as a function corresponding to a device that controls nodes provided in a plurality of AONs closed under the policy that 3R processing is not required for the computer device. A function corresponding to the optical path setting unit 1 for setting the optical path according to the IP address of the packet is realized, and as a function corresponding to the optical path setting unit 1, burst data head detection for detecting the arrival of the head packet of burst data A function corresponding to the unit 11, and a function corresponding to the cut-through path setting unit 12 for setting the cut-through path to the next node when the arrival of the head packet of the burst data is detected by the burst data head detection unit 11. Burst data that detects the arrival of the last packet of burst data A function corresponding to the end detection unit 13 and a cut-through path release unit that releases the already set cut-through path after passing the last packet when the burst data end detection unit 13 detects the arrival of the last packet of burst data. 14 as a function corresponding to the cut-through path setting unit 12, and a function corresponding to the cut-through path setting determination unit 22 that determines whether or not a cut-through path can be set up to the next node. When the determination result of the cut-through path setting enable / disable determining unit 22 is not settable, the function corresponding to the burst data buffer 24 that temporarily stores the incoming burst data and the individual items constituting the burst data stored in the burst data buffer 24 Individual packets according to their IP addresses A function corresponding to the IP forwarding unit 25 for forwarding is realized, and a function corresponding to the cut-through path setting unit 12 in the node corresponding to the edge node of the AON is a first corresponding to the edge node of another adjacent AON. A function for determining whether or not a cut-through path can be set up to a node, and a cut-through path to a second or subsequent node corresponding to the adjacent edge node of another AON when the determination result of this function is not settable By installing in the computer device a program that realizes the function of sequentially trying the settings, the computer device can be made a device corresponding to the device for controlling the node of this embodiment.
[0044]
Further, the program of the present embodiment is installed in a computer device, so that the computer device has a function corresponding to the signal quality test packet sending unit 29 for sending a signal quality test packet to another node, and the packet. When received without signal quality degradation, a function corresponding to the signal quality determination unit 30 and the signal quality notification unit 31 for returning its own ID to the packet transmission source, and 3R processing is not required according to the returned ID. A function corresponding to the area calculation unit 32 for calculating the area is realized.
[0045]
By recording the program of the present embodiment on the recording medium of the present embodiment, the computer apparatus can install the program of the present embodiment using this recording medium. Alternatively, the program of this embodiment can be directly installed on the computer device from the server holding the program of this embodiment via the network.
[0046]
Accordingly, it is possible to realize a node and an optical path network that can reduce the labor, time, and invalid hold required for setting a cut-through path by using a computer device.
[0047]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce labor and time required for setting a cut-through path, and invalid hold.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an optical path network according to an embodiment.
FIG. 2 is a block configuration diagram of an optical path setting unit of the present embodiment.
FIG. 3 is a block diagram of a cut-through path setting unit of the present embodiment.
FIG. 4 is a configuration diagram of a burst head packet according to the present embodiment.
FIG. 5 is a configuration diagram of a burst last packet according to the present embodiment.
FIG. 6 is a block configuration diagram of a node according to the present embodiment.
FIG. 7 is a diagram for explaining an AON configuration procedure;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical path setting part 11 Burst data head detection part 12 Cut through path setting part 13 Burst data end detection part 14 Cut through path release parts 21 and 27 Switch 22 Cut through path setting availability determination part 23 Setting part 24 Burst data buffer 25 IP transfer part 26 Speed conversion unit 29 Signal quality test packet transmission unit 30 Signal quality determination unit 31 Signal quality notification unit 32 Area calculation units A to I, G1 to G13 Nodes # 1 to # 3 AON

Claims (11)

A plurality of nodes have a plurality of AON (All) closed under the policy that 3R (Reshaping; Retiming; Retransrating) processing is not required.
(Optical Network)
This node
Means for setting an optical path according to an IP address of an incoming IP packet;
The means for setting this optical path is:
Means for detecting the arrival of the first packet of burst data;
Cut-through path setting means for setting the cut-through path to the next node when the arrival of the first packet of burst data is detected by the detecting means;
Means for detecting the arrival of the last packet of burst data;
A cut-through path releasing means for releasing an already set cut-through path after passing through the final packet when the arrival of the last packet of burst data is detected by the detecting means;
The cut-through path setting means includes
Means for determining whether or not a cut-through path can be set up to the next node;
Means for temporarily storing incoming burst data if the determination result of the determination means is not settable,
IP transfer means for individually transferring individual packets constituting burst data stored in the temporary storage means according to the IP address thereof,
The cut-through path setting means in the node corresponding to the edge node of the AON is:
Means for determining whether or not a cut-through path can be set up to a first node corresponding to an edge node of another adjacent AON;
Means for sequentially setting cut-through paths to the second and subsequent nodes corresponding to the adjacent edge nodes of the other AON when the determination result of the determining means is not settable. Path network. Subsequent burst data amount information is written as header information of the first packet,
The optical network according to claim 1, wherein the means for detecting the arrival of the head packet comprises means for detecting the head packet of burst data with reference to the subsequent burst data amount information.   3. The optical path network according to claim 2, wherein the burst data amount information is packet number information or packet length information following the head packet. As the header information of the last packet, information indicating that the packet is the last packet of burst data is written,
The optical path network according to claim 1, wherein the means for detecting the arrival of the last packet comprises means for detecting the last packet of burst data with reference to information indicating that the packet is the last packet. The means for determining whether the setting is possible is as follows:
Means for determining the presence or absence of a free wavelength for setting a cut-through path to the next node,
The means for determining whether or not the node corresponding to the AON edge node can be set includes the presence / absence of an empty wavelength for setting a cut-through path to the next node corresponding to the other AON edge node, and the own node 2. The optical path network according to claim 1, further comprising means for respectively determining a difference between an allowable transfer rate up to and a permissible transfer rate up to the next node. The node is
Means for sending a signal quality test packet to another node;
When receiving this packet without signal quality deterioration, a means for returning its own ID to the packet transmission source;
The optical path network according to claim 1, further comprising means for calculating an area that does not require 3R processing according to the returned ID. Provided in multiple AONs closed under the policy of not requiring 3R processing,
Means for setting an optical path according to the IP address of an incoming IP packet;
The means for setting this optical path is:
Means for detecting the arrival of the first packet of burst data;
Cut-through path setting means for setting the cut-through path to the next node when the arrival of the first packet of burst data is detected by the detecting means;
Means for detecting the arrival of the last packet of burst data;
Cut-through path releasing means for releasing the already set cut-through path after passing through the final packet when the arrival of the last packet of burst data is detected by the detecting means;
With
The cut-through path setting means includes
Means for determining whether or not a cut-through path can be set up to the next node;
Means for temporarily storing incoming burst data when the determination result of the determination means is not settable,
IP transfer means for individually transferring individual packets constituting burst data stored in the temporary storage means according to the IP address,
The cut-through path setting means in the node corresponding to the edge node of the AON is
Means for determining whether or not a cut-through path can be set up to a first node corresponding to an edge node of another adjacent AON;
If the determination result of the determining means is not settable, means for sequentially trying to set cut-through paths to the second and subsequent nodes corresponding to the adjacent edge nodes of the other AON
A node characterized by comprising: A means for sending a signal quality test packet to another node, a means for returning its own ID to the packet sending source when this packet is received without signal quality degradation, and a 3R process according to the returned ID 8. The node according to claim 7, further comprising means for calculating an area that is not required . When installed in an information processing device, the information processing device has a function corresponding to a device that controls nodes provided in a plurality of AONs closed under the policy that 3R processing is not required .
Realize the function to set the optical path according to the IP address of the incoming IP packet ,
As a function to set this optical path ,
A function to detect the arrival of the first packet of burst data;
When the arrival of the first packet of burst data is detected by this detecting function , a cut-through path setting function for setting the cut-through path to the next node, and
A function to detect the arrival of the last packet of burst data;
When the arrival of the last packet of the burst data is detected by the function of this detection, a cut-through path release function to release the cut-through path that has already been set after passing said final packet
Realized,
As the cut-through path setting function ,
A function for determining whether or not a cut-through path can be set up to the next node;
If the determination result of this determination function is not settable, the function to temporarily store the incoming burst data,
The individual packets that make up a burst data stored in the function of the temporary storage is realized and the IP forwarding function for forwarding to the individual in accordance with the IP address,
As the cut-through path setting function in the node corresponding to the edge node of the AON,
A function for determining whether or not a cut-through path can be set up to a first node corresponding to an adjacent edge node of another AON;
If the determination result of the determination function is not settable, the function sequentially attempts to set cut-through paths to the second and subsequent nodes corresponding to the adjacent edge nodes of the other AON.
A program characterized by realizing . The function of sending out a signal quality test packets to other nodes, and the ability to return its own ID to the delivery source of the packet when receiving the packet signal quality without deterioration, the 3R process according to the reply the ID The program according to claim 9, which realizes a function of calculating an area that is not required. 11. A recording medium readable by the information processing apparatus on which the program according to claim 9 or 10 is recorded .

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