JPH11308239A - Network management method and management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a network management method capable of maintening and managing a network without providing a centralized management center. SOLUTION: A maintenance terminal 6 of an exchange station of an order request source in a network including pluralities of exchange stations designate an exchange station of an order request destination to enter an order for maintenance and management and to generates an maintenance and operation OAM cell including the order by a function of an order processing section 5a of a control section 5 and cell processing sections 3b, 4b of line adaptor sections 3, 4, the OAM cell is sent as an ODR-OA cell and an exchange station designated by the ODR-OA cell conducts processing according to the order, sends the processing results to an order request source based on the ODR-OA cell and the order request source receives the processing result to apply maintenance and management to the network. When many orders and many processing results are in existence, they are divided respectively and they are sent by means of pluralities of the ODR-OA cells.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM (Asynchr
onous Transfer Mode) The present invention relates to a network management method and a management system for maintaining and managing a network.
In general, a switching station constituting a network is provided with a maintenance terminal for maintaining and managing the switching station. However, the central management center maintains and manages the entire network including the exchanges. Therefore, as the size of the network increases, the size of the central management center also needs to be increased. There is a demand for economical maintenance and management of such networks.

[0002]

2. Description of the Related Art FIG. 17 is a schematic explanatory view of a conventional ATM network. 100 is an exchange, 101 is a central management center, 102 is an ATM switch, 103 and 104 are circuit units, 105 is a control unit, and 106 is a control unit. Indicates a maintenance terminal. The exchange 100 has almost the same configuration, transmits and receives ATM cells through the line corresponding units 103 and 104, and routes the ATM cells through the ATM switch 102. Such exchanges 100 are mutually connected by a line to form a network.

[0003] Further, the central management center 101 is provided with each exchange 10.
It has a function of collecting information of 0 and maintaining and managing the network. The maintenance terminal 106 has a function of performing maintenance and management in its own station, and a function of transmitting and receiving information to and from the central management center 101 as necessary. However, it does not have a function of performing maintenance and management for other stations.

[0004] ATs transmitted by ATM networks
The M cell has a 53-byte configuration including a 5-byte header section and a 48-byte information field, and includes a user cell and an OAM (Operation, Administration and Maint).
enace; maintenance and operation) cells. The user cell is for transmitting voice, image, data, etc. between subscribers by using information fields.
Its functions include a performance monitoring function, a defect and failure detection function, a system protection function, and failure information /
It has a performance report information transmission function, a function of specifying a failure point, and the like. The OAM cell is inserted into an empty position of the user cell and transmitted.

[0005]

Generally, the exchange 100 is provided with a maintenance terminal 106. The maintenance terminal 106 has a function of maintaining and managing its own station as described above. And, for example, PVC between the opposite station
(Permanent Virtual Channel) setting / cancellation,
It is possible to read path information and the like. However, it does not have a function of causing other stations to perform various controls.

Therefore, in the event of a network failure or the like,
Even if the normality of the own station is checked, the normality of the other station cannot be checked.
According to the method (1), a trouble occurrence point is separated, a detour is set, and the like, so that it is difficult to quickly respond. SUMMARY OF THE INVENTION It is an object of the present invention to allow a maintenance terminal of an exchange to execute operations such as maintenance and management for another station by relatively simple means.

[0007]

A network management method according to the present invention is: (1) a network management method for performing maintenance and management by designating one exchange from one exchange in a network, and comprising: An OAM cell sends out an order for maintenance and management by designating an order-requested exchange from an exchange of the same, and the OAM cell receives the OAM-cell and executes the order by the OAM cell. It includes the process of doing. That is, by transmitting the order by the OAM cell, it is possible to maintain and manage other stations.

[0008] (2) The OAM cell has a header portion and an information field. In this information field, a request identifier indicating the contents of the order, a sequence number when the order is divided and transmitted, and the number of divisions are indicated. The configuration includes the total number. Therefore, in the case of a simple order, one OAM
In some cases, cells may be sufficient, but in the case of a complicated order, the data is divided into a plurality of OAM cells and transmitted.

(3) For the order from the exchange requesting source exchange, the order request destination exchange sets in the table whether or not execution is possible, and compares the contents of the order by the OAM cell with the contents set in the table. The step of executing the order can be included only when the order is executable for the order from the exchange requesting exchange.

[0010] (4) The exchange requesting the destination exchange office returns the result of executing the order from the exchange office of the order request source to the exchange office of the order request origin and sends the order contents and information to the maintenance terminal of its own station. And displaying the order execution result.

Further, the management system of the present invention is a management system in a network for maintaining and managing a network connecting a plurality of exchanges. A maintenance terminal 6 for designating an exchange and inputting an order, a control unit 5 for editing the order by inputting the order from the maintenance terminal 6 and controlling each unit, and ordering OA in accordance with an instruction from the control unit 5.
It has a configuration including line correspondence sections 3 and 4 inserted into the information field of the M cell and transmitted, and an ATM switch 2 for routing the ATM cell. Line corresponding units 3 and 4 for receiving and identifying the OAM cell addressed to the own station from the exchange, and extracting the order of the OAM cell, and a control unit for performing control according to the order extracted by the line corresponding units 3 and 4. 5 and an ATM switch 2 for routing ATM cells.

(6) A configuration in which the line-corresponding unit of the exchange requesting source adds the sequence number indicating the transmission order and the total number indicating the number of divisions to the OAM cell when the order is divided and transmitted. In addition, the line corresponding unit of the switching center of the order request destination determines that the reception of the order has been completed based on the sequence number and the total number of the received OAM cell, and transfers the order to the control unit. .

(7) The exchange requesting the destination exchange has a table for setting whether or not the order from the order requesting exchange can be executed, and the control unit determines whether or not the received order is executable. Is determined with reference to the table, and the order is executed only when the order can be executed.

(8) A configuration in which the line-corresponding unit of the exchange requesting destination exchange exchanges the result of executing the order from the order requesting exchange under the control of the control unit to the order requesting exchange. And a maintenance terminal for displaying the contents of the order and the execution result under the control of the control unit.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a main part of an embodiment of the present invention, wherein 1 is an exchange, 2 is an ATM switch,
4 is a line corresponding unit, 5 is a control unit (processor), 6 is a maintenance terminal, 7 is a memory, 3a and 4a are transmitting and receiving units, 3b and 4b.
Denotes a cell processing unit, and 5a denotes an order processing unit.

Each exchange 1 constituting the network has A
It has a configuration including the TM switch 2, the line corresponding units 3 and 4, the control unit 5, the maintenance terminal 6, and the memory 7. By specifying the order request destination from the maintenance terminal 6 and inputting the order, the control unit 5 is edited by the order processing unit 5a and transferred to the cell processing units 3b and 4b of the line corresponding units 3 and 4, the order is placed in the information field of the OAM cell, and transmitted from the transmitting and receiving units 3a and 4a. Become. Therefore, the centralized management center is omitted, and various orders can be placed in the OA from the maintenance terminal 6 of the desired exchange, not only for the own station but also for other stations.
It can be sent out and maintained and managed by M cells.

FIG. 2 is a diagram for explaining the format of a basic OAM cell. The header portion of 5 bytes has a virtual path identifier VPI (virtual path identifier) like a user cell.
ier) and a virtual channel identifier VCI (Virtual Chassis).
nnel Identifier) and the payload type PT (Pay
load Type) and cell loss priority indication CLP (CellLo)
ss Priority) and header error control HEC (Header)
Err Check).

The 48-byte information field has a 4-bit OAM cell type OAM-CT (OAM Cell Tip
e) and the 4-bit OAM function type OAM-FT (OA
It consists of an MFunction Type, a 45-byte function information field FSF (FunctionSpecific Field), a 6-bit reserve Rsv, and a 10-bit cell error check EDC (Error Detection Check).

In the present invention, an OAM cell type OAM-CT and an OAM function type OA are transmitted with the order included in the function information field FSF of the OAM cell.
A different channel from the conventional OAM cell is set to the M-FT. Hereinafter, this cell is referred to as an ODR-OAM cell.

FIG. 3 shows an ODR-OA according to an embodiment of the present invention.
FIG. 5 is an explanatory diagram of a format of an M cell, which is composed of a 5-byte header section and a 48-byte information field, and the information fields OAM-CT, OAM-FT, Rsv, E
DC is the same as that shown in FIG. A 45-byte function information field FSF has a 1-byte request identifier, a 4-bit sequence number, a 4-bit total number, a 15-byte request source location identifier,
A request destination location identifier of 5 bytes and a detailed order storage area of 13 bytes are set.

The request identifier, sequence number, total number, request source location identifier, request destination location identifier, and the number of bytes of the order detail storage area set in the function information field FSF are not limited to those described above. It can be changed as needed. FIG. 4 shows their contents. For example, the order detail storage area has a 13-byte configuration. If the number of bytes of the order to be transmitted is large, the order is divided and transmitted. In this case, the ODR-OAM is divided and sequentially transmitted. A sequence number is added to the cell, and a total number indicating the number of divisions is added.

FIG. 5 shows an ODR-OA according to an embodiment of the present invention.
FIG. 7 is an explanatory diagram of a sequence of order transmission / reception by M cells.
In this embodiment, network maintenance and management are performed by transmitting and receiving ODR-OAM cells in a network in which VP / VC connections have been set up in stations A to D. Is shown.

From the maintenance terminal 6 of this station B (see FIG. 1),
The PI / VCI and the request destination location identifier are “AL
L "indicates that all stations have been designated, and when, for example, X1 is input as order details, the order processing unit 5 of the control unit 5
“a” performs order editing such as assignment of a request identifier and transfers the edited data to the line corresponding units 3 and 4, and the cell processing unit 3 of the line corresponding units 3 and 4
ODR-OAM cells are formed in b and 4b, and the ODR-OAM cells in which the order is divided are transmitted from the transmission / reception units 3a and 4a as indicated by ODR-OAM (ALL).

The stations A, C, and D determine whether or not all the ODR-OAM cells obtained by dividing the order have been received by using the sequence number and the total number. It is determined whether or not execution is permitted. This permission is
Whether or not each exchange performs an order from another station is set in, for example, an executable setting table formed in the memory 7 controlled by the control unit 5. FIG. 6 shows an example of the execution availability setting table.

The execution permission / inhibition setting table shown in FIG. 6 shows the stations A, C, and D, where a circle indicates execution and a cross indicates non-execution. For example, in the station A, the operation X1 from the stations B and C can be executed, but the operation X1 from the station D cannot be executed.
2 and X3 are set to be executable only from the station C. In the station C, the operation X1 cannot be executed from the stations A and D, but can be executed from the station B. In station D,
The operation X1 is set to be executable only from the stations A and C, and is set not to be executable from the station B.

Therefore, in the stations A and C, the execution permission / inhibition setting table is set to be executable for the operation X1 from the station B. Therefore, the contents of the received order and the request source are transmitted to the maintenance terminal. After the location identifier is displayed and the operation X1 is performed, the result is displayed on the maintenance terminal and transmitted to the station B by the ODR-OAM cell. Also in this case, if the amount of information of the execution result is large,
It is divided and transmitted by ODR-OAM cells. When the existing network management center and this function coexist, the stations that have executed the operations (here, stations A and C) use the notification method (for example, CMIP) to the existing network management center to notify the stations. Information transfer from the maintenance terminal to the center is performed.

In the station D, since the execution is disabled for the operation X1 from the station B in the execution permission / inhibition setting table, the execution becomes impossible in the determination as to whether or not the execution is permitted. An ODR-OAM cell indicating NG is transmitted to B.

In the station B, the OD from the stations A, C and D
By receiving the R-OAM cells and displaying the respective processing results on the maintenance terminal, the desired operation can be performed from the station B to the other stations, and the results can be confirmed. As a network, for example, there is a configuration in which exchanges of a plurality of communication carriers are included. In this case, the execution permission / inhibition setting table can be set to “not executable” so as not to respond to a specific order between exchanges of different communication carriers, for example, reading of billing information.

FIG. 7 is a diagram for explaining the operation at the time of order transmission according to the embodiment of the present invention. The ATM switch 2, the line corresponding units 3 and 4, the processor 5 (corresponding to the control unit 5 in FIG. 1), and the maintenance terminal 6 and the case where cell processing is performed in the line corresponding unit 3 will be described with reference to each step.

FIG. 7 corresponds to the operation of the station B for transmitting an order. First, the maintenance terminal 6 receives the VPI of the VP / VC connection as input information 10.
= A, VCI = b and the request destination location identifier (I
D) = I1, for example, order = ACTION (see FIG. 4), and order parameters = p1, p2.

The processor 5 performs an order editing 11 for assigning a request identifier and the like, and sends an order sending request 11 to the firmware of the line corresponding unit 3. Such processing is performed by the function of the order processing unit 5a of the control unit 5 in FIG.

The line handling unit 3 responds to the order transmission request by
The order division 13 is performed in accordance with the size of the order detail storage area of the ODR-OAM cell, and the own station location identifier (ID) reference 14, that is, the own station location identifier (ID) = Is is read from the memory 15, and the ODR-OAM cell is read. OAM
Cell formation 16 is performed.

For example, assuming that the number of order divisions is y and the location identifiers for all the stations by the VP / VC connection are I1, request identifier = ACTION, sequence number = x (1,2,3,... Y), Total number =
y, request source location identifier = Is, request destination location identifier = I1, detailed order information (p1, p2, etc.)
Is inserted in the function information field FSF.
An M cell is formed. Then, they are transmitted as ODR-OAM cells 17 and 18 in both directions of the VP / VC connection.

FIGS. 8 and 9 are diagrams for explaining the operation of the embodiment of the present invention at the time of order reception. The same reference numerals as those in FIGS. 1 and 7 denote the same parts, and the order from the station B in FIG. The operation corresponding to the receiving stations A, C, and D will be described. The above-mentioned request identifier = ACTION, sequence number = x, total number = y, request source location identifier = Is, request destination location identifier = I1, detailed order information (p1, p2
) Is inserted in the function information field FSF-
The reception processing 21 is performed on the OAM cell 20 by the firmware of the line corresponding unit 3.

Then, it is determined 22 whether the request type is a response or not.
When the request type is response, for example, the request identifier is R-ACTION, R-CREATE, R-DELETE.
In the case of a response to each order such as E, R-SET, R-GET (see FIG. 4), the received ODR-OAM cell is transmitted to the ATM.
If the response is not sent out through the switch 2 and the line corresponding unit 4 and is not a response, for example, the request identifier is ACTION, CREA.
When indicating an order such as TE, DELETE, SET, GET, etc., a request destination location identifier (LOC ID) = I
A determination 23 as to whether or not the number is 1 is performed. That is, the determination is made with reference to the own station location identifier (ID) = I1 stored in the memory 15.

In this case, if they do not match, the ODR
Since it is not an OAM cell, the received ODR-OAM cell is transmitted via the ATM switch 2 and the line corresponding unit 4.
If they match, it is addressed to the own station, so a determination 24 is made as to whether the sequence number matches the total number. That is, x
= Y, and if x ≠ y, the memory 1
In step 5, the order details 25 are written. If x = y, a transmission 26 of the detailed order information read from the memory 15 and the requesting location identifier (LOC ID) to the processor 5 is performed.

The processor 5 performs an order reception 31,
A determination 32 as to whether or not execution is possible is performed. That is, in the execution permission / inhibition setting table 38 formed in the memory 37, the execution permission / prohibition of the other station is set. The terminal 6 displays the order contents 33 and executes the order execution 34. Further, the order execution result is displayed 35, and the execution result is transmitted to the firmware of the line corresponding unit 3 by the function of the order execution result edit / return 36.

Accordingly, the maintenance terminal 6 stores, for example, the contents of the received request, the execution result, and the request source location identifier (ID).
And the like 39 can be displayed. As a result, it is possible to recognize from the display contents that the order has been received from another station, the execution result due to the order, and the request source.

If the execution permission / prohibition setting table 38 indicates that the execution of the order from the station B is prohibited as in the case of the station D in FIG. 5, the execution is not possible for the received order. The function of order execution result edit / return 36 is notified. The function of this order execution result edit / return 36 is as follows.
The result of the order execution or the order execution failure is notified to the firmware of the line corresponding unit 3.

In this firmware, the order division 28 is performed in response to the execution result return request reception 27, and the reference 29 of the own station location identifier (ID), that is, the own station location identifier (ID) = I1 of the memory 15 is obtained. Read, response identifier OD to the above-mentioned request identifier = ACTION
In the case of an R-OAM cell, request identifier = R-ACTION
(See FIG. 4), sequence number (No) = x, total number = y, requesting location identifier (ID) = Is,
A request destination location identifier (ID) = I1, an ODR-OAM cell including detailed order information such as an action result is formed 30 and the ODR-OAM cell 40 is sent to the requesting exchange according to the requesting location identifier.

FIG. 10 is an explanatory diagram of an operation at the time of receiving a response according to the embodiment of the present invention. The same reference numerals as those in the above-described embodiments denote the same parts. In the firmware of the line corresponding unit 3, the reception 41 of the ODR-OAM cell 40 is performed, and the determination 42 as to whether or not the request identification is a response is performed. In this case, since the response is indicated by the request identifier = R-ACTION, next, it is determined whether or not the request source location identifier (LOC ID) = Is matches the own station location identifier 43.
That is, the determination is made with reference to the own station location identifier (ID) = Is stored in the memory 15.

If the received ODR-OAM cell is not a response or is different from its own location identifier, the ODR-OAM cell is transferred to the next exchange. If the request identifier indicates a response and the requesting location identifier is the same as the local station location identifier, the sequence number =
A determination 44 as to whether or not the number is the total number is performed. That is, when x <y, the details 45 of the order response are written in the memory 15. If x = y, the order-divided ODR-OA
Since the reception of the M cell is completed, the firmware of the line corresponding unit 3 sends the detailed information / requested location identifier (LOC ID) read from the memory 15 to the processor 5 46.

The processor 5 receives the order response 47, edits the order execution result 48, and instructs the maintenance terminal 6 to display the edit result 49. Therefore, the execution result and the request destination location identifier (I
D) is displayed.

As described above, using the ODR-OAM cell, it is possible to cause other stations to execute various operations similar to those of the own station. For example, (1) PVC setting /
Release / change / read, (2) Change / read device status, (3) Device diagnosis, (4) File backup / read file information, (5) Patch file submission / read, (6) Traffic information / Reading of performance information, (7) reading of generated alarm, (8) cell continuity test, (9) setting of time information, etc.

FIG. 11 shows an ODR-O according to an embodiment of the present invention.
FIG. 10 is an explanatory diagram of another station path setting operation using an AM cell, showing a case where a path is set from station A to station C. OE is the physical accommodation position of the line corresponding unit, VPI is the virtual path identifier, VC
I indicates a virtual channel identifier. PV from station A to station C
C is uniquely determined by OE, VPI, and VCI. For example, OE = x2, VPI = a2, VCI =
b2. PVC from station C to station A
Is defined by OE = x5, VPI = a3, and VCI = b3. Similarly, in the station B, the physical accommodation positions and the VPI and VCI are defined on the station A side and the station C side.

For example, when a new virtual path is set for the station C from the station A, the OE, V
The PI and VCI are passed to the station C as parameters. For example, the station A specifies the station C, and OE = x7, VP
I = a5, VCI = b5 and OE = x8, VPI = a
6, the PVC setting order including VCI = b6 is
Transmit by OAM cell. Thereby, station C
A virtual path as shown by a thick line is newly set.

FIGS. 12 to 16 are explanatory diagrams of the sequence corresponding to the path setting shown in FIG.
The case where a path is set to another station in a network in which a VP / VC connection is set as shown in FIG. 12 and 16 show the sequence of the station A, and the maintenance terminal 6
(See FIG. 1), the OE of the own station is set as the target connection.
= X2, VPI = a2, VCI = b2, request destination location identifier (LOCID) = C, order = CONNECT
T, OE = x7, VPI = a as order parameters
5, VCI = b5 and OE = x8, VPI = a6, VC
Input I = b6.

Processor 5 of station A (see FIGS. 1 and 7)
Edits this order and requests the firmware of the line corresponding unit 3 to transmit the order. This firmware divides the ODR-
An OAM cell is formed and transmitted (a1). In this case, 3
This shows a case where the ODR-OAM cells 61, 62, and 63 are transmitted after being divided into cells.
= A2, VCI = b2, request identifier = CREATE, sequence number indicating transmission order = 1, total number indicating division number = 3, request source location identifier (LOC I
D) = A, request destination location identifier (LOC ID)
= C, divided order details = CONNECT.

The next ODR-OAM cell 62 has the sequence number = 2, and the divided order details = OE = x
7, VPI = a5, VCI = b5 are set, and the next ODR-OAM cell 63 has a sequence number =
3, the divided order details = OE = x8, VPI
= A6, VCI = b6. These ODR-OAM cells are transmitted in both directions.

The ODR-OAM cell from the station A is addressed to the station C, and the station B relays. Therefore, station B
Determines whether the request identifier indicates a response to the ODR-OAM cell from the station A as shown in FIG. 13 (b1). In this case, since it is not a response, it is next determined whether or not the request destination location identifier (LOC ID) is the same as the local station location identifier (b2). In this case, since the ODR-OAM cell is addressed to the station C, it is determined that the ODR-OAM cell is not addressed to the own station, and the ODR-OAM cell is transmitted to the station C. Similar determinations (b3), (b4), (b5), (b) are made for the next ODR-OAM cell into which the order is divided.
6) is sequentially performed, and the ODR-OAM cell is transmitted to the station C.

In the station C, as shown in FIG.
When a DR-OAM cell is received, it is determined whether or not the request identifier is a response (c1). In this case, it ’s not a response,
Next, it is determined whether or not the request destination location identifier (LOC ID) is the same as the local station location identifier (c).
2). Since this ODR-OAM cell is addressed to the station C, it is next determined whether or not the sequence number is equal to the total number (c3). That is, it is determined whether or not all the divided orders have been received.

In this case, when the total number = 3 and the first O
Since the DR-OAM cell has a sequence number = 1,
The sequence number becomes the total number, and this ODR-O
The order details of the AM cell are stored in the memory (c4).

The next ODR-OAM cell has the sequence number = 2, and stores the order details in the memory by the determination processing (c5) to (c8) similar to the above steps (c1) to (c4). The next ODR-OAM cell has the sequence number = 3, and has the above-mentioned steps (c5) to (c7).
When the same determination processes (c9) to (c11) as described above are performed, in step (c11), the sequence number is equal to the total number. Therefore, it is determined that all the divided orders have been received, and the reception and storage are performed. The order details are transmitted to the processor (c12).

As shown in FIG. 15, the processor of the station C receives the order (c13), and judges whether or not the order of “CONNECT” is executable with reference to the executable / unavailable setting table (c14). In this case, "CO"
If the setting is "NECT" order executable, the order content is displayed on the maintenance terminal 6 (c15). The display content 71 at that time is: requester = A, order details = CONNECT
T, order parameter OE = x7, VPI = a5, V
CI = b5 and OE = x8, VPI = a6, VCI = b
It becomes 6.

Then, the processor 5 sends the designated PV
The setting process of C is performed (c16), and the processing result is displayed on the maintenance terminal 6 (c17). This display content 72 includes CONNECT of order details and OE = x of order parameters.
7, VPI = a5, VCI = b5 and OE = x8, VP
I = a6, VCI = b6, and the result is OK or NG.
In the case shown in the figure, as shown in FIG. 11, since the PVC is set in the station C, the result is OK. Then, the processing result is transmitted by the ODR-OAM cell (c
18).

The ODR- from the station C3 including the processing result is
Since OAM cell 73 is for station A, VP
I = a3, VCI = b3, request identifier = R-CREAT
E, sequence number = 1, total number = 1, requesting location identifier (LOCID) = A, requesting destination location identifier (LOC ID) = C, C as order details
ONCONNECT RESULT = OK is included. If there is a lot of detailed order information, it is transmitted by a plurality of ODR-OAM cells by order division.

Upon receiving the ODR-OAM cell 73 from the station C, the station B determines whether or not the request identifier is a response (b7). In this case, a response to the CREATE order is shown. As shown, station B uses this ODR
-Changes the VPI / VCI in the header of the OAM cell 73 to the station A, and sends out as VPI = a2, VCI = b2. In the station that performs the cell relay described above,
As in the case of relay transmission of ATM cells, as described above,
The processing for changing to the VPI / VCI corresponding to each destination is performed.

At the station A, the received ODR-OA
It is determined whether the request identifier of the M cell indicates a response (a
2). In this case, as described above, since a response is indicated, it is determined whether or not the request source location identifier (LOC ID) indicates the local station location identifier (a3). In this case, since the response is to the order transmitted by the own station, it is next determined whether or not the sequence number is equal to the total number (a
4). In this case, since the total number is 1, the sequence number is equal to the total number, and the order details are transmitted to the processor 5 (a5).

The contents 81 to be transmitted to the processor 5 are as follows: order request source = A, CONNECT RESUL of order details
T = OK. The processor 5 is connected to the line corresponding unit 3
Receiving the order processing result from the firmware (a)
6) Display it on the maintenance terminal 6. The display content 82 is
CONNECT for order details and O for order parameters
E = x7, VPI = a5, VCI = b5 and OE = x
8, VPI = a6, VCI = b6, and the result OK.

With the processing described above, the station A
Using the R-OAM cell, the path setting of another station, for example, the station C can be performed. Therefore, fault isolation and the like, detour setting, and the like can be executed without going through the centralized management center. Also, the status of the network can be monitored by collecting status information of other stations.

[0061]

As described above, according to the present invention, the order for other stations is batch-divided or divided and transmitted as ODR-OAM cells, thereby controlling the other stations and maintaining and managing the network. This makes it possible to omit the centralized management center as in the conventional example, and thus has the advantage of reducing the initial cost and operating cost of the network.

Also, by operating an arbitrary exchange in the network as if it were a centralized management center, maintenance and maintenance of the network can be performed.
Since management can be performed, there is an advantage that maintenance and management by remote control can be easily performed even in a network where the central management center is omitted. Further, by setting the execution permission / prohibition for an order from another station, it is possible to set execution impossibility for a certain order. For example, a request from another station to release an important path of the own station is made. There is an advantage that it is possible to refuse to read the important information or to refuse to read the important information of the own station.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a format of a basic OAM cell.

FIG. 3 is an explanatory diagram of a format of an ODR-OAM cell according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of fields of an ODR-OAM cell according to the embodiment of this invention.

FIG. 5 is an explanatory diagram of a sequence of order transmission / reception by an ODR-OAM cell according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram of an execution availability setting table.

FIG. 7 is an explanatory diagram of an operation at the time of order transmission according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram of an operation at the time of order reception according to the embodiment of this invention.

FIG. 9 is an explanatory diagram of an operation at the time of order reception according to the embodiment of the present invention.

FIG. 10 is an explanatory diagram of an operation at the time of receiving a response according to the embodiment of the present invention.

FIG. 11 is a diagram illustrating an operation of setting a path of another station using an ODR-OAM cell according to an embodiment of the present invention.

FIG. 12 is an explanatory diagram of a sequence when another station path is set in the embodiment of the present invention.

FIG. 13 is an explanatory diagram of a sequence when another station path is set in the embodiment of the present invention.

FIG. 14 is a sequence explanatory diagram when another station path is set in the embodiment of the present invention.

FIG. 15 is an explanatory diagram of a sequence when another station path is set in the embodiment of the present invention.

FIG. 16 is a sequence explanatory diagram when another station path is set in the embodiment of the present invention.

FIG. 17 is a schematic explanatory diagram of a conventional ATM network.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switching center 2 ATM switch 3, 4 Line correspondence part 3a, 4a Transmission / reception part 3b, 4b Cell processing part 5 Control part (processor) 5a Order processing part 6 Maintenance terminal 7 Memory

Claims (8)

[Claims] In a network management method for performing maintenance and management by designating one switching center from another switching center in a network, maintenance is performed by designating an order requesting switching center from an order requesting switching center. Transmitting an order to be managed by an OAM cell, and executing the order by the OAM cell at the exchange requesting the order request receiving the OAM cell. 2. The OAM cell has a header section and an information field. In the information field, a request identifier indicating the contents of the order, a sequence number when the order is divided and transmitted, and a total number indicating the number of divisions are provided. 2. The network management method according to claim 1, wherein the network management method includes a configuration including a number. 3. The order-requested exchange sets the execution permission / prohibition of the order from the order-requesting exchange in a table, and compares the order contents by the OAM cell with the set contents of the table. 2. The network management method according to claim 1, further comprising the step of executing the order only when the order can be executed from the exchange requesting exchange. 4. The switching center of the order request destination returns the result of executing the order from the switching center of the order request source to the switching center of the order request source, and sends the order contents and the information to the maintenance terminal of the local station. 4. The network management method according to claim 1, further comprising a step of displaying an order execution result. 5. In a management system in a network for performing maintenance and management of a network to which a plurality of exchanges are connected, an exchange requesting source exchange designates an order request destination exchange and inputs an order. A maintenance terminal, a control unit that performs order editing by the order input from the maintenance terminal and controls each unit, and a line corresponding unit that inserts the order into an information field of the OAM cell and transmits the order according to an instruction from the control unit. And an ATM for routing the ATM cell
A switch corresponding to the order requesting exchange, receiving and identifying an OAM cell addressed to the own station from the order requesting exchange, and extracting an order of the OAM cell; and A control unit for performing control according to the order extracted by the line corresponding unit;
A management system having a configuration including an ATM switch for performing cell routing. 6. The OAM cell at the time of dividing and transmitting an order,
A sequence number indicating the transmission order and a total number indicating the number of divisions are added, and the line corresponding unit of the exchange requesting the destination requests the completion of the order reception based on the sequence number and the total number of the received OAM cell. 6. The management system according to claim 5, further comprising: a configuration for determining the order and transferring the order to the control unit. 7. The order-requested exchange having a table for setting whether or not to execute the order from the order-requesting exchange, wherein the control unit determines whether or not the received order is executable. 7. The management system according to claim 5, further comprising: a configuration in which the determination is made with reference to the table and the order is executed only when the order can be executed. 8. 8. The line-corresponding section of the order-request-destination exchange exchanges a result of executing the order from the order-request-originated exchange under the control of the control section to the order-request-originating exchange. The management system according to any one of claims 5 to 7, further comprising a maintenance terminal configured to display the contents of the order and an execution result according to control from the control unit.