JPH07283820A - Path setting system - Google Patents

Abstract

PURPOSE:To realize a path setting system in which a traffic of a control network is not increased. CONSTITUTION:Path configuration information to be stored in VPI conversion tables 11-1, 11-2 in a cross connect being a network element is set in one cell and the resulting cell is sent from a subscriber system equipment 1-1 provided at a termination point of a path. Each cross connect receives the cell and stores respectively the path configuration information included in the cell to a table of its own element. Since the path configuration information is sent while being integrated in one cell, the increase in the traffic for a control network is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a path setting system, and more particularly to an ATM (Asynchronous Trans).
The present invention relates to a path setting system for setting a path in a fer mode network.

[0002]

2. Description of the Related Art Generally, an ATM network is configured to include network elements such as a subscriber system device and a cross connect (XC) in addition to a centralized management device. And
Within each cross connect (XC) is a VPI (Virtual)
l Pass Identifier) conversion table is provided, and the path is set or changed by setting or changing this table.

That is, by setting the VPI conversion table in response to a request from the user terminal, the band is rented for time.

Here, the band lending is a request (connection destination, required band capacity, time) from a user terminal, and it is determined whether or not the request can be met. This is a service form that permits the use of the specified band. Therefore, the service form is completely different from the leased line service. And SDH (Synchronou
In the s Transfer Mode network, once a path is set, the band of the transmission line is occupied even if no signal is transmitted to the path, whereas in the ATM network, the band is used only when information flows. To do. As a result, it is possible to carry out an efficient accommodation design of the band by using the vacant resources. Taking advantage of this feature, one of the basic services expected to be realized in the ATM network is the time rent service of the band.

Conventionally, when setting or changing a path, a message is sent from the centralized management device to all the cross-connects on the path of the path, and the VPI is set for each cross-connect.
A method of updating the conversion table has been known.

That is, the centralized management device performs the path and VPI value by the capacity management function and the configuration management function when a path setting request is made by the user, and creates a VPI conversion table (one-side operation table) of cross-connects on the path. The VPI value on the transmitting / receiving side was downloaded and set.

Further, conventionally, immediately after setting a new path in the VPI conversion table, the service of that path is started. Therefore, when the path is set, the VPI conversion table is updated for each cross-connect that sets the line via the control network that connects the cross-connect and the centralized management device.

[0008]

In the above-mentioned prior art, since the setting information is notified to each cross-connect via the control network, when the path setting requests are concentrated at one time, the cross-connect and the centralized management device are connected. There is a drawback in that the traffic of the control network connecting them increases.

In particular, when a path detour is set in response to a failure or the like, many alarms are transmitted via a control network connecting the centralized management device and the cross connect.
Moreover, since the component information for the detour is downloaded through the same control network, the amount of processing in the node increases,
There is a drawback that the connection delay at the time of call setup occurs and the time required for path relief cannot be ignored.

By the way, in Japanese Patent Laid-Open No. 2-284543, VCI (Vi
A technique for acquiring / transferring a parcel of a real channel identifier is disclosed. However, according to this known technique, it is necessary to provide a means for accumulating information including the reserved partition upper limit and the number of transmission paths and a means for searching the availability of partition expansion in each node, which increases the hardware amount of each node. There is a drawback that.

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and its object is to provide a path setting system in which the amount of hardware does not increase and the traffic of the control network does not increase. It is to be.

[0012]

A path setting system according to the present invention includes first to first pieces of path configuration information for configuring a path.
A system for setting a path by storing it in each table in the second to Nth network elements among the Nth network element (N is an integer of 3 or more), and at a terminal point of the path to be set. A first network element that is provided and sends out a cell corresponding to each of the tables and that includes path configuration information to be stored in the correspondence table; and a path configuration information that is received in the cell and is included in the cell And a second to Nth network elements stored in the table, respectively.

[0013]

A cell corresponding to each table in the second to Nth network elements and including path configuration information to be stored in the correspondence table is sent from the first network element provided at the end point of the path to be set. To do. 2nd to Nth
The network element of 1 receives this cell and stores the path configuration information contained in the cell in the table in its own element. The path configuration information includes identification information of each of the second to Nth network elements, a flag indicating that reading is not performed, and order information indicating a transmission order with another cell, and based on these pieces of information, the second configuration information is obtained. -The Nth network element stores the path configuration information in the cell in the table in its own element. 2nd to Nth
When the completion time of storing the path configuration information in all the tables in the network element exceeds a predetermined time, the path configuration information in all the tables is cleared, and after clearing, the cell is sent again.

The service start time and end time of a path set by sending cells and the detour path that becomes a detour when a failure occurs in the path are registered in advance in a table, and the path of the path is registered according to the registered contents. The service is started and ended, and the service of the bypass path is started when a failure occurs.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a path setting system according to the present invention.

In the figure, a path setting system according to an embodiment of the present invention includes a central management device 100, network devices such as subscriber devices 1-1 and 1-2 and cross-connects 10-1 and 10-2. It is configured to include. Then, it is a system that rents out a band according to a request from a user. The number of subscriber devices and cross-connects is not limited to those shown in the figure.

Each cross-connect in the figure converts the VPI number of the received cell based on the contents of the VPI conversion tables 11-1 and 11-2, and transfers it. That is, VPI
It has a VPI conversion table which is referred to in order to convert the VPI number of the received cell into the VPI number of the transmitting side as shown in FIG. 2 in the cross connect which is the network element for converting the value. For example, the VPI “a1” of the receiving side transmission line HW1 is set to the VPI “a2” of the transmitting side transmission line HW5, and the VPI “b” of the receiving side transmission line HW2 is set.
1 ”to the VPI“ b2 ”of the transmission side transmission line HW3 and the VPI“ c1 ”of the reception side transmission line HW3 to the transmission side transmission line HW10.
VPI “c2” of the receiving side transmission line HW1 VPI “z
1 ”is converted into the VPI“ z2 ”of the transmission line HW8.

Further, it is assumed that the capacity management of the path is executed by the centralized management device 100 and each of the subscriber devices 1-1 and 1-2. Further, it is assumed that the VPI number in each network is assigned to all the transmission lines that are connected to each cross-connect and each subscriber device unit and are physically operable. It is assumed that the VPI number is set for each cross connect and each subscriber device unit under the control of the centralized management device 100.

The path required in the above network has a fixed end-to-end capacity band, and is uniquely determined by the capacity management of each subscriber unit 1-1, 1-2. Shall be. That is, the information about the terminal point for transmitting and receiving the information is generated under the control of the centralized management device 100, and the connection setting of the terminal point in each network element and the subscriber device 1-1, 1-. End-to by the capacity allocation in 2.
-End Pass service becomes possible.

The capacity management carried out by each of the subscriber devices 1-1 and 1-2 is carried out on the information inputted by the user. Then, it is premised that the subscriber system device can always transfer the path setting cell generated and terminated in the network.

In such a configuration, the central control device 100
Is between the adjacent subscriber equipment and cross-connect in the network,
Alternatively, a list of VP links (not shown) that use the transmission paths defined between the cross-connects and the cross-connection, and a capacity management table 110 that shows the total of the used bandwidth capacity at each time point on the time axis, Configuration management information 1 including a route from a transmission source of a band to a connection destination, a list of VP links on a transmission line constituting the connection, and termination point information
And 20 as a database. Then, the central control device 100 receives a bandwidth lending request from the user,
Based on the route information in the configuration management information 120, the capacity management table 110 is searched for whether or not the capacity on the route can be secured.

A request for renting a band from a user to a subscriber device (a connection destination is Z and a required capacity is M) is sent to the centralized management device 100 via the subscriber device. The centralized management device 100 has the configuration management information 120 and the capacity management information 110 in order to determine the route to the connection destination and whether or not the capacity can be secured.

The configuration management information 120 is End-to-E.
It is the route information of the nd transmission line, the channel number that the node can use, and the like. The capacity management information 110 is cross-connect-
The capacity used or the capacity to be used for each transmission path defined between nodes is represented on the time axis.

Based on these pieces of information 110 and 120, the centralized management device 100 performs the search and accommodation determination in the following procedure.

Based on the configuration management information 110, the route information from the request source to the connection destination is searched. For example, as shown in FIG. 3, if the transmission path is from the subscriber device 1-1 (designated as path end A) to the subscriber device 1-2 (designated as path end Z), the path is From end A to pass end Z
W1 → XC10-1 → HW2 → XC10-2 → HW3 →
"Z" route and "A → HW1 → XC10-1 → HW
4 → XC10-3 → HW5 → Z ”exists. Note that HW1, HW2, HW3, HW4, and HW5 are transmission lines, and XC10-1, XC10-2, and XC10-3 are cross-connects.

Therefore, the central control unit 100 is shown in FIG.
The configuration management information 120 having the contents shown in FIG. Further, all the route information such as the route from the path end A to the path end Y is stored in the centralized management device 100.

Next, the capacity management table of each transmission line that constitutes these path information is searched to see if the required capacity M can be secured during the lending time period. For example, referring to FIG. 5A showing an example of the capacity management table, the used capacity changes as indicated by the solid line J1 with the change of the time t. Here, if the broken line H in the drawing is the maximum usage amount, "H-J1" is the usable capacity (used capacity).

Therefore, the usable capacity (used capacity) changes as the time t changes. Therefore, if the minimum used capacity m and the required capacity M are compared and the use of the transmission line corresponding to the table satisfying the condition of the capacity M <the capacity m is permitted, the total used capacity is indicated by the broken line H. It cannot be exceeded.

When the condition of the capacity M <the capacity m is not satisfied, the capacity management tables shown in FIGS. 9B and 9C are sequentially referred to. Then, by referring to the solid lines J2 and J3 in each figure, use of the transmission path corresponding to the table satisfying the condition of capacity M <capacity m in these capacity management tables is permitted.

If secured, the capacity management table is updated with the requested contents, the user is notified that the requested bandwidth can be rented, and the service is started. On the other hand, if it cannot be secured, the above processing is similarly performed for the next route information. When the band cannot be lent out finally, the user is notified of the information to that effect.

Returning to FIG. 1, if the capacity can be secured in short, the reservation of the capacity is registered in the capacity management table 110. Through the above processing, the centralized management device 100 determines the route, and determines the VPI value and the termination point of the VP link on the transmission line that constitutes the route.

Next, the central control device 100 determines the determined component information (the receiving side V in the cross connect on each route).
(Corresponding information between the PI value and the VPI value on the transmission side) and the path attribute to the subscriber device at the end of the path within the control range of the device itself.
Notify 1. At the same time, the centralized management device 100 activates a timer in order to confirm that the path can be set within a predetermined time.

The subscriber device 1-1 which has received the notification transmits the path setting cell based on the information. The path setting cell will be described with reference to FIG. FIG. 6 shows an example of the format of the path setting cell. In the figure, the path setting cell includes a 5-octet header 31 and a 4-bit OAM (Operating Administer).
application monitoring type field 32 and a 4-bit function type field 33,
Function-specific field 34 with a maximum of 366 bits and CRC (Cyclic Redundan) for error detection
CY Code) -10 field 34. In addition, this cell is maximum 48 except the header.
It is an octet.

In the function-specific identification field 34 of the path setting cell, there is a field 34-1 consisting of the ID (identification information) of the cross-connect to be set in the VPI conversion table and the VPI value of the receiving side and the VPI value of the transmitting side. 34
-2, ... 34-m are included, but these are arranged in the order of nodes on the route. Here, paying attention to the field 34-1, in this field, the cross-connect ID to be set in the VPI conversion table is “NE1”, the reception-side transmission path ID, the reception-side VPI value, the transmission-side transmission path ID,
The VPI value on the transmission side is "HW1VP11-HW2VP12".
Included as. Also, focusing on the field 34-2, in this field, the cross-connect ID to be set in the VPI conversion table is “NE2”, the receiving-side transmission path ID, the receiving-side VPI value, the transmitting-side transmission path ID, and the transmission-side ID. The side VPI value is included as “HW2VP12−HW3VP13”. Similarly, in field 34-m, VP
The ID of the cross-connect to be set in the I conversion table is “NEm”, the ID of the receiving side transmission line, the receiving side VPI value, the transmitting side transmission line ID, and the transmitting side VPI value are “HWL1VP1”.
m-HWL2VP1n ”.

Based on these pieces of information, it is possible to identify the receiving side transmission line and the VP link contained therein, and the transmitting side transmission line and the VP link contained therein.

Further, a flag F indicating whether or not this field has been read is included. In this example, it is assumed that when the reading is performed, it is "1", and when the reading is not performed, it is "0". Therefore, field 3
34-m, which have the flag F of "0", have not been set in the table.

If the number of cross-connects for which the VPI conversion table is to be set is large and cannot be accommodated in the function-specific field 34, the VPI conversion table is sent to the transmission line by being divided into a plurality of path settings. However, the reading order of information between cells is indicated by the sequence number (SN) 340, and the order is maintained.

Since the above information is included, in each cross-connect, if there are a plurality of cells, the order between the cells is confirmed by the contents of the sequence number 340, and the information can be read from the cells in the earlier order. Done. However, processing is not performed for cells in which all the flags are "1", and after processing is performed for other corresponding path setting cells, they are transferred together as they are.

As described above, the information in the cell is sequentially acquired in each cross-connect, and the VPI values and attributes of the receiving side and the transmitting side are set in the VPI conversion table. The cell is sent to the next cross-connect according to the information in the VPI conversion table after the setting. By repeating this, the central control device 100
It is confirmed that this cell is detected in the subscriber unit 1-2 which is the end of the path under the control of.

After this confirmation, the subscriber unit 1-2 notifies the centralized management unit 100 of the result. Central management device 10
After updating the database, 0 notifies the subscriber devices 1-1 and 1-2 of the completion of the setting.

The timer is released when all the path settings are completed, but when the path settings are not completed within a predetermined time, the path settings are performed again. This will be described later.

VPI between the subscriber unit and the user terminal
Since the value is set in advance at the time of contract, the End
It is possible to set the constituent element information of the -to-End path to each network element.

Regarding the path for which the setting of the component information has been completed, the service can be started when the capacity is actually allocated to the subscriber device which is the end of the path under the control of the centralized management device 100, and the actual allocation is performed. The service ends when you cancel. Therefore, the subscriber devices 1-1 and 1-2 at both ends of the path hold the values of the set path identifiers (VCI, VPI) until the service starts.
The capacity is set to "0".

Here, as shown in FIG. 7, the subscriber unit 1-1 has a termination point, which is a transmission / reception point for data with the intra-station transmission line 210 and the user-side transmission line 200, as in the cross-connect. 24 and 25, and a VPI conversion table 21.

Further, unlike the cross-connect, the subscriber system 1-1 has the following features for each transmission line connected to itself.
The ID, capacity, attributes (reservation, detour, etc.) of the set path, service conditions (service start time and end time for reservation, and specific fault occurrence for detour) are registered under the control of the centralized management device 100. Capacity management control unit 2
It is also configured to include.

Then, the capacity management control unit 2 uses the central management unit 12 when the path data for each path is contracted.
0, the path data registration unit 201, the monitor unit 202 that monitors the actual data amount from the user based on this registration content, and when the actual data amount exceeds the contracted capacity as a result of this monitoring. User and centralized management device 12
It is configured to include a control unit 203 for notifying 0 and controlling the discarding of the amount of data exceeding the contract.

The registration contents of the pass data in the pass data registration unit 201 may be, for example, those shown in FIG. That is, the VPI set for each cross connect
The path IDs (P1, P2 ...) As identification information for each path realized by the above, the contract capacities (M1, M2 ...) Corresponding to these path IDs, attributes (reservation, in-service ...), service conditions ( (Start time, end time, etc.) are registered.

Here, focusing on the path P1, its contracted capacity is M1, and it is currently reserved. Then, when the current time reaches T1, the service is started, and the time is T
When it reaches 2, the service ends. Also,
Focusing on the path P2, its contracted capacity is M2, and it is currently in service. The service ends when the current time reaches T4. Furthermore, pass P
Focusing on 3, the path is a detour when a failure occurs in the path P2, and when the notification that the failure occurs in the path P2 is received, the contracted capacity changes from zero to M2.

Returning to FIG. 7, when any one of the paths managed by the device itself satisfies the service condition registered for each path, bandwidth capacity is allocated to the path. The time when this service condition is satisfied is, for example, when the time by the internal clock circuit 22 reaches the start time T1 in the above-mentioned path P1.

Furthermore, when the ID of the path in which a failure has occurred is notified, the bandwidth capacity is allocated to the path.
That is, when notification (or alarm detection) of the ID of a path in which a failure has occurred is performed by the central control device 100,
The capacity used in the failed path is assigned to the path (capacity "0") set as a detour for this path, so that the detour is used when a failure occurs in the network. Is switched to. For example, in the above-mentioned path P3, the capacity of M2 is allocated when the failure occurrence of the path P2 is notified.

That is, the path reservation service is performed by registering the service start time and service end time for the band requested by the user. Then, at the registered service start time, by allocating the requested capacity in the subscriber device,
The service will be started.

Further, by changing the capacity to "0" in the subscriber device at the registered service end time,
The service will end. Furthermore, in order to release the path, the subscriber device 1-1 sends a cell for notifying the release of the path to the corresponding path, the cells are sequentially received by the cross-connects on the path, and the VPI information of the path is converted into VPI. This is done by deleting it from the table.

The actual allocation refers to the actual allocation of transmission line resources. For example, if the usable capacity of a certain transmission line is 100%, it means that 30% of that capacity is allocated to a certain path and the remaining 70% is allocated to another path.

Relief of a path when a failure occurs is performed as follows. That is, the detour path for a certain path is registered as the capacity “0”. Then, when a failure alarm of the main signal system is detected by the subscriber system device at the path end when a failure occurs, or the notification of the path where the failure has occurred is sent to the central control device 1
When received from 00, the capacity of the faulty path is immediately allocated to the detour in the subscriber device. As a result, the path can be promptly remedied. Moreover, unlike the conventional case, the path setting cell is not sent to set the detour when the failure occurs, but is set in the path data registration unit in advance, so that the traffic does not increase when the failure occurs.

By the way, there is a case where the VPI value cannot be set in the VPI conversion table in any of the cross connections during the path setting process. In such a case, that effect is notified from the cross-connect to the centralized management device 100.
Then, after receiving this, the centralized management device 100 deletes the path setting information set up to the midway cross-connect,
Set the path again.

In this case, the path setting cell is set to "release" and transmitted to all the cross-connects on the path, and the VPI of the VPI conversion table of all the cross-connects on the path.
Clear the value once. After this clearing, the path setting cell is newly transmitted to perform the path setting process.

It is also possible that the path setting cell is lost during the path setting process. Therefore, the central control device 10
When the setting completion result is not returned within the predetermined time by the timer of 0, first, the VPI value of the VPI conversion table of all cross-connects for the path for which the setting has failed, that is, the entry related to the path is temporarily cleared. After this is cleared, the path setting process is performed again.

In this case, instead of clearing the VPI conversion tables of all cross-connects, the central control unit 100
Therefore, a method of individually confirming the contents of the VPI conversion table of each cross connect can be considered. That is, it is determined which cross-connect VPI conversion table is set up, and the path setting cell is transmitted again to the cross-connects for which the VPI conversion table is not set up to perform path setting processing.

Next, the processing in each cross connect will be described. FIG. 8 is a flowchart showing the processing in each cross connect in FIG.

In the figure, when the cross-connect receives the path setting cell (step 61), it determines whether all the read flags in the cell are "1" (step 6).
2). This is to prevent processing of cells already read by another cross connect.

If all the read flags are not "1", that is, even if only one is "0", the cell having the smallest sequence number SN value is selected (step 6).
2 → 63). And VP about own cross-connect
The I conversion information is read to the own cross-connect based on the identification information and set in the VPI conversion table (steps 63 → 64). Further, for the read information, the read flag is set to "1" (step 65).

The cells for which setting processing to these tables is completed, the cells whose sequence number SN value is not the minimum, and the cells whose read flags are all "1" are temporarily buffered (steps 65 → 66, step 63 → 6
6, step 62 → 66), and then the buffered cell is sent to the next cross-connect according to the value of the VPI conversion table after the setting (step 67), and the process ends.

Further, the operation processing sequence of each unit in FIG. 1 will be described with reference to FIGS. 9 and 10. 9 is a message flow between a user, a subscriber device, and a centralized management device relating to band lending, and FIG. 10 is a path setting processing sequence diagram of each network element. In both figures, the same parts as those in FIG. 1 are designated by the same reference numerals. ing.

First, in FIG. 9, when the user notifies the band lending request 70, the subscriber system 1-1 transfers the band lending request 71 to the centralized management device. The centralized management device 100 performs accommodation determination processing that determines whether or not the transmission path can be accommodated.

When it can be accommodated, the central control device 10
The path setting request 72 is transmitted from 0 to the subscriber device 1-1, and the path setting process is performed in the subscriber device 1-1. The sequence of this path setting process is shown in FIG.

On the other hand, when the accommodation is not possible, the notification 73 that the accommodation is impossible is transmitted to the subscriber unit 1-1.

Finally, the notification 74 of the result of whether or not lending is possible is transmitted from the subscriber unit 1-1 to the user.

Next, referring to FIG. 10, the central control device 10
When the path setting request 81 is transmitted from 0 to the subscriber unit 1-1, the subscriber unit 1-1 inserts the path setting cell. This path setting cell is a subscriber device 1-
From 1 to each of the cross-connects 10-1 and 10-2, they are sequentially transmitted as path setting cells 82, 83 and 84, and finally to the subscriber system 1-2 which is the end of the path.

The subscriber system 1-2 sends a setting end notification 85 indicating the completion of path setting, and the centralized management device 100 having received this notification updates the database. afterwards,
The centralized management device 100 sends the setting completion notifications 86 and 88 to the respective subscriber devices 1-1 and 1-2, and the respective subscriber devices 1-1 and 1-2 respectively notify the user terminals of the result. Notifications 87 and 89 are transmitted.

It should be noted that the timer is started from the time of transmitting the path setting request, the time T is monitored, and it is judged whether or not the database update processing is completed within a predetermined time.

As described above, in the present embodiment, since the device at the end of the path is instructed to send the path setting cell, the VPI conversion table of all the cross-connects forming the route from the centralized management device at the time of setting the path. It is not necessary to send a message to, and the number of message processes can be reduced and the process can be simplified. There is also an advantage that it is possible to confirm whether or not the path is set correctly by checking the path setting cell with the device at the end of the path. The system of this embodiment has a great effect when the path is set and released frequently and quickly, such as on-demand service request.

[0073]

As described above, according to the present invention, the path configuration information to be stored in each table in the network element is stored in one cell and transmitted from the network element at the end point of the path, and is included in this cell. By storing the respective path configuration information stored in the tables in each element, there is an effect that the amount of hardware does not increase and the traffic of the control network can be prevented from increasing. Further, there is an effect that it is possible to prevent an increase in traffic by setting a service start time and a detour when a failure occurs in advance.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a path setting system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration example of a VPI conversion table in a cross connect in FIG.

FIG. 3 is a diagram showing a configuration example of an ATM network.

FIG. 4 is a diagram showing a configuration example of a route information table.

5A, 5B, and 5C are diagrams showing examples of capacity management tables.

FIG. 6 is a diagram showing an example of a format of a path setting cell transmitted from a subscriber device in FIG.

FIG. 7 is a block diagram showing an internal configuration of a subscriber system device in FIG.

8 is a diagram showing an example of registration contents of a pass data registration unit in FIG.

FIG. 9 is a flowchart showing a process in each cross connect in FIG.

FIG. 10 is a message flow between a user, a subscriber system device, and a centralized management device regarding band lending.

FIG. 11 is a path setting processing sequence diagram of each network element.

[Explanation of symbols]

 1-1, 1-2 Subscriber system device 2 Capacity management control unit 10-1, 10-2 Cross-connect 11-1, 11-2 VPI conversion table 100 Centralized management device 110 Capacity management information 120 Configuration management information

Claims (8)

[Claims] 1. By storing path configuration information for configuring a path in each table in the 2nd to Nth network elements among the 1st to Nth (N is an integer of 3 or more) network elements A system for setting a path, comprising: a first network element which is provided at an end point of the path to be set and which transmits a cell corresponding to each table and including path configuration information to be stored in the corresponding table; And stores the path configuration information contained in the cell in the table in the own element, respectively.
A path setting system comprising: an Nth network element. 2. The path configuration information includes respective identification information of the second to Nth network elements, and the second to Nth network elements are identified.
2. The path setting system according to claim 1, wherein the Nth network element has a cell reading means for reading the path configuration information to be stored in a table in the own element from the cell based on the identification information. 3. The path configuration information includes a flag indicating that reading is not performed by the second to Nth network elements, and the second to Nth network elements are stored in a table in the own element. 2. The path setting system according to claim 1, further comprising cell reading means for reading path configuration information to be read from the cell based on the flag. 4. The cell includes sequence information indicating a transmission sequence with other cells transmitted from the first network element, and the second to Nth network elements are stored in a table in the own element. 2. The path setting system according to claim 1, further comprising cell reading means for reading the power path configuration information from the cell based on the order information. 5. When the storage completion time of the path configuration information in all the tables in the second to Nth network elements exceeds a predetermined time, the entry related to the path among the path configuration information of all the tables is cleared. The path setting system according to any one of claims 1 to 4, further comprising: a means for performing the clearing and a means for retransmitting the cell after the clearing. 6. A management table for pre-registering start time information indicating a service start time of a path set by transmitting the cell, and starting a service by the path at a time according to the start time information. The path setting system according to any one of claims 1 to 5, wherein 7. A management table for pre-registering end time information indicating the service end time of the path set by sending the cell, and ending the service by the path at the time indicated by the end time information. The path setting system according to claim 1, wherein the path setting system is configured to do so. 8. A detour circuit is further included when the fault occurs, further including a management table for preregistering a detour path that is a detour of the path set by the transmission of the cell when the failure occurs. The path setting system according to any one of claims 1 to 5, wherein a service by a path is started.