JP3036526B2 - ATM test apparatus, ATM test method used therefor, and recording medium storing control program therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM test apparatus, an ATM test method used therefor, and a recording medium on which a control program is recorded.
t Protocol) terminal and ATM (Asynchr)
CLAD (Cell Assembly) is used between an on-use Transfer Mode (Asynchronous Transfer Mode) network and
and Disassembly: a method of testing a connection in a system connected via cell assembly / disassembly.

[0002]

2. Description of the Related Art Conventionally, IP datagrams [generally ST
M (Synchronous Transfer Mo)
de: synchronous transfer mode) may be regarded as data]
As a method of converting to an M cell, AA in the ITU-T recommendation
L5 (ATM Adaptation Layer)
5).

[0003] Existing services are accommodated in the ATM network by CL.
Although done via AD, testing at the IP level has to be done end-to-end.

This indicates that it is difficult to separate the user and the network at the demarcation point. However, the network must guarantee the normality up to the demarcation point, and requires a means for verifying the connection between the IP section and the section including the ATM section and verifying the normality.

[0005] Existing test methods include an IP section and an AT section.
There is one that tests the M section separately to confirm normality. That is, as shown in FIG. 5, tests in the ATM section and the IP section are performed for each section.

In FIG. 5, CLAD 4 includes an Ethernet terminator 10 for terminating an Ethernet interface,
A cell conversion unit 11 for converting an Ethernet datagram into an ATM cell, a decellularization unit 12 for converting an ATM cell into an Ethernet datagram, an ATM termination unit 13 for terminating an ATM interface, and an ICMP (Internet Control
Message Protocol: IPIC that performs echo control
An ATMLP (Loopback) that connects to the MP control unit 14 and the ATM termination unit 13 to terminate the loopback cell.
Protocol controller 16.

[0007] The IP terminal 2 is a terminal for performing IP communication.
The ATM device 3 is a device that performs ATM processing. The test of the IP section between the IP terminal 2 and the CLAD 4 is performed via the Ethernet termination unit 10 and the IP terminal 2 and the IPICMP control unit 1.
The test between the CLAD 4 and the ATM device 3 is performed between the ATM device 3 and the ATMLP control unit 16 via the ATM termination unit 13.

[0008] Generally, the transmission path test in the ATM section is performed by OAM.
(Operation, Administration
and Maintainance) in a loopback test using a cell. A loopback location ID is set in advance for each ATM terminating unit, and a test cell transmitting unit in the ATM device generates an OAM cell and inserts it into a transmission line during a test.

[0009] When the loopback location ID in the received OAM cell matches, the ATM termination unit autonomously activates the OAM cell.
Turn the AM cell back. ATM of folded OAM cell
The connection of the transmission path can be confirmed by receiving and confirming the test cell in the test cell receiving unit in the apparatus.

The connection confirmation test in the IP section is performed by ICMP.
This is performed using In a method widely known as ping, a datagram of ICMP type 8 is sent to the partner node, and a response of ICMP type 0 is waited for confirmation. As a result, it is possible to confirm the connection of the IP connection in the IP network.

As shown in FIG. 6, a plurality of IP terminals 2a,
In the configuration in which the 2b and the ATM device 3 are connected via the CLADs 4a and 4b, the above-mentioned ping is used for confirming the IP connection between the IP terminals 2a and 2b.

In this method, it is possible to confirm that a connection has been set up normally, but it is not possible to identify a faulty part when there is a setting error inside the ATM network or when there is a setting error in the CLADs 4a and 4b.

[0013]

SUMMARY OF THE INVENTION The conventional ATM described above.
In the test method, since the test for the ATM section and the test for the IP section are performed for each section, unified management from the network cannot be performed, which is a major problem in network operation.

[0014] Further, since the test for only the ATM section and the test for only the IP section are respectively performed, the isolation of the fault location becomes complicated. Further, there is a problem that the test execution time in the ATM section and the IP section becomes longer.

Therefore, an object of the present invention is to solve the above-mentioned problems, to perform a test from the ATM section to the IP section, to reduce the network operation cost and to simplify the test control, ATM test apparatus capable of minimizing total test time and AT used therefor
An object of the present invention is to provide a recording medium recording an M test method and a control program thereof.

[0016]

According to the present invention, there is provided an ATM test apparatus through an ATM network for transferring data in an asynchronous transfer mode and a cell assembling / disassembling apparatus for assembling / disassembling cells for the ATM network. AT for testing a connection between the ATM network and the IP terminal in a network system including an IP terminal connected to an ATM network
An M test apparatus, comprising: detecting means for detecting whether or not a cell from the ATM network is a loopback cell during execution of a loopback test from the ATM network; and detecting the loopback cell by the detecting means. Sometimes the cell is the IP
Determining means for determining whether or not the packet is destined for a terminal; and transmitting the test data between the cell assembling / disassembling apparatus and the IP terminal to the IP terminal when the determining means determines that the packet is destined for the IP terminal. Means, upon receiving a response to the test data from the IP terminal, determining that the connection between the IP terminal and the cell assembling / disassembling apparatus is normal, and returning the loopback cell to the ATM apparatus. The cell assembling / disassembling apparatus is provided with a return means.

An ATM test method according to the present invention comprises an ATM network for transferring data in an asynchronous transfer mode and an IP connected to the ATM network via a cell assembling / disassembling apparatus for assembling / disassembling cells for the ATM network. An ATM test method for testing a connection between the ATM network and the IP terminal in a network system including terminals,
When performing a loopback test from the ATM network, the A
Detecting whether the cell from the TM network is a loopback cell, and determining whether the cell is addressed to the IP terminal when the loopback cell is detected,
Transmitting test data between the cell assembling / disassembling apparatus and the IP terminal to the IP terminal when it is determined that the IP terminal is addressed to the IP terminal; and receiving a response to the test data from the IP terminal. Determining that the connection between the IP terminal and the cell assembling / disassembling device is normal and returning the loopback cell to the ATM device.

The recording medium on which the ATM test control program according to the present invention is recorded is transmitted via an ATM network for transferring data in an asynchronous transfer mode and a cell assembling / disassembling apparatus for assembling / disassembling cells for the ATM network. A recording medium storing an ATM test control program for causing the cell assembling / disassembling apparatus to test a connection between the ATM network and the IP terminal in a network system including an IP terminal connected to an ATM network. A
The TM test control program is provided to the cell assembling / disassembling device.
When performing a loopback test from the ATM network, the A
Detecting whether a cell from the TM network is a loopback cell; determining whether the cell is addressed to the IP terminal when the loopback cell is detected; and determining whether the cell is addressed to the IP terminal when the loopback cell is detected. The test data between the assembling / disassembling apparatus and the IP terminal is sent to the IP terminal,
Upon receiving a response to the test data from the P terminal, it is determined that the connection between the IP terminal and the cell assembling / disassembling device is normal, and the loopback cell is returned to the ATM device.

That is, the ATM (Asynch) of the present invention is used.
The method of testing the Transfer Mode (asynchronous transfer mode) includes an ATM network and a CLAD (Cell).
Assembly and Disassembly:
IP (Integer) connected via cell assembly / disassembly)
An object of the present invention is to make it possible to easily perform a test of a connection connecting terminals (rnet Protocol) from an ATM network.

In the ATM test method of the present invention, the loopback OAM (Operation, Ad)
ministry and Maintena
nce) When the loopback point of the cell is set to indicate the IP address of the IP terminal and a loopback test is performed, when the cell received by the CLAD is determined to be a loopback cell, the loopback location ID of the cell is changed. If the IP address refers to an IP terminal,
MP (Internet Control Messager)
ge Protocol: Internet Control Message Protocol) Type 8 datagram is generated and IP
Send to terminal.

[0021] The IP terminal receives the IP packet in an IC.
ICMP type 0 for MP type 8 datagram
Replies the datagram. When the CLAD receives an ICMP type 0 datagram from the IP terminal, the CLAD determines that the IP connection between the IP terminal and the CLAD is normal, and the loopback location ID is an IP address indicating the IP terminal. To the ATM device.

Thus, the general A
A test including the IP section can be easily performed in the same manner as the test in the TM section. Therefore, the IP terminal and the ATM network are connected via the CLAD.
In the P-connection confirmation, it is possible to easily identify a failure point in the case of a setting error in the ATM network or a setting error of the CLAD, thereby improving the operability of the entire network and enabling an economical test.

[0023]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an ATM (Asynchronous Transfer) according to an embodiment of the present invention.
1 is a block diagram showing a configuration of a network system (r Mode: asynchronous transfer mode). In the figure, in the ATM network system according to one embodiment of the present invention,
(Internet Protocol) Terminal 2 and AT
M device 3 and CLAD (Cell Assembly)
and Disassembly: cell assembly / disassembly) 1
Connected through. The IP terminal 2 is a terminal that performs IP communication, and the ATM device 3 is a device that performs ATM processing.

The CLAD 1 includes an Ethernet termination unit 10,
Celling section 11, decellularizing section 12, ATM termination section 13
And IPICMP (IP Internet Cont
roll Message Protocol: Internet Control Message Protocol) control unit 14 and OA
M (Operation, Administratio
n and Maintance) transfer control unit 15
And ATMLP (ATM Loopback Prot)
ocol) control unit 16 and a control memory 17.

The Ethernet terminating unit 10 of the CLAD 1 terminates the Ethernet interface, and the cell unit 11 converts the Ethernet datagram into an ATM cell. The decellularizing unit 12 converts the ATM cell into an Ethernet datagram. The ATM termination unit 13 terminates the ATM interface.

The IPICMP control 14 is connected to the Ethernet terminating unit 10 to perform ICMP echo control. ATML
The P control 16 is connected to the ATM termination unit 13 to terminate the loopback cell. The OAM transfer control 15 connects the ATMLP control 16 and the IPICMP control 14.

The control memory 17 has an IPICMP control 14
And programs executed by the ATMLP control 16 and the OAM transfer control 15, respectively, and a ROM (Read Only Memory), a floppy disk, or the like can be used.

FIG. 2 is a sequence chart showing the operation of the network system according to one embodiment of the present invention. In the figure, a is a loopback cell from the ATM device 3, and b is a command for instructing the IP terminal 2 to loop back.

C is the IP address of the IP terminal 2 and ICMP
A type 8 datagram transmission instruction command, where d is I
It is a datagram of CMP8. "e" is a datagram of ICMP0, and "f" is a notice of response reception. g is a notice of loopback success, and h is a loopback cell returned to the ATM device 3.

FIG. 3 is a flowchart showing the processing operation of the CLAD 1 in response to a test request from the ATM device 3 in FIG. 1, and FIG. 4 is a flowchart showing the CL operation in response to a response from the IP terminal 2 in FIG.
It is a flowchart which shows the processing operation of AD1.

The processing operation of the ATM test in the network system according to one embodiment of the present invention will be described with reference to FIGS. The network system according to the embodiment of the present invention has the same system configuration as the conventional system shown in FIG. 6, and the processing operation shown in FIGS. 3 and 4 is such that each part of the CLAD 1 executes a program stored in the control memory 17. It is realized by executing.

It is assumed that a loopback location ID is set in the ATMLP control unit 16 of the CLAD 1 in advance. At this time, the IP address of the IP terminal 2 is also set at the same time.

When a loopback test is performed between the ATM device 3 and the IP terminal 2, first, a loopback cell a is transmitted from the ATM device 3. ATM end unit 13 of CLAD1
Receives the loop-back cell a, and determines whether or not it is a loop-back test cell (step S1 in FIG. 3). A
When the TM termination unit 13 determines that the cell is a loopback test cell,
The test cell is sent to the ATMLP control unit 16.

The ATMLP control unit 16 refers to the loopback location ID in the data of the test cell (step S2 in FIG. 3), and when it is the same as the preset loopback location ID for the IP terminal 2 (FIG. 3). In step S3, an instruction b for instructing a test is sent to the OAM transfer control unit 15, and the corresponding test cell is held at the same time (step S4 in FIG. 3). At this time, the ATMLP control unit 16
The IP of the IP terminal 2 is transmitted to the transfer control unit 15 as test data.
Deliver address data.

The OAM test control unit 15 controls the IP
An instruction c for instructing the transmission of an ICMP type 8 datagram to the address is sent to the IPICMP control unit 14 (step S5 in FIG. 3). The IPICMP control unit 14 sends the Ethernet termination unit 1 to the IP address of the IP terminal 2.
The datagram d of the ICMP type 8 is transmitted via 0 (step S6 in FIG. 3).

The IP terminal 2 is an ICMP type 8 addressed to its own terminal.
Is received, a datagram e of ICMP type 0 is returned. Ethernet termination unit 10 is IP
When the response from the terminal 2 is received, when the IP datagram is ICMP, the corresponding datagram is written in IPICMP.
Deliver to the control unit 14.

When confirming the ICMP type 0 datagram response by transmitting the ICMP type 8 datagram (step S11 in FIG. 4), the IPICMP control unit 14
A response reception f is sent to the AM transfer control unit 15 (step S12 in FIG. 4).

When the OAM transfer control unit 15 receives the response reception f from the IPICMP control unit 14, the OAM transfer control unit 15
Then, a notice g indicating the success of the loopback is sent to No. 6 (step S13 in FIG. 4). When the ATMLP control unit 16 receives the notification g of the loopback success from the OAM transfer control unit 15, the ATMLP control unit 16 loops back the held loopback test cell from the ATM device 3 and sends it out to the ATM device 3 (step in FIG. 4). S14). The ATM device 3 determines the loopback test cell h received from the ATMLP control unit 16 via the ATM termination unit 13 and ends the test.

In the embodiment of the present invention described above,
Although the loopback location ID is set in advance, the system can be operated more flexibly by explicitly indicating the IP address of the IP terminal without setting the loopback location ID in advance.

As described above, since the connection confirmation test of the section including both the IP section and the ATM section can be easily performed from the ATM device 3 side, the test can be performed without any special test apparatus, and the apparatus cost and the network can be reduced. Operation cost can be reduced. In addition, since it is easy to identify a fault location, it is possible to quickly perform fault isolation, so that operation costs can be reduced.

[0041]

As described above, according to the present invention, an ATM network for performing data transfer in an asynchronous transfer mode,
An ATM test method for testing a connection between an ATM network and an IP terminal in a network system including an IP terminal connected to the ATM network via a cell assembling / disassembling apparatus for assembling / disassembling a cell for a TM network. If the cell assembling / disassembling apparatus detects that a cell from the ATM network is a loopback cell during execution of a loopback test from the ATM network, and the cell is addressed to an IP terminal, the cell assembling / disassembling apparatus and the IP Sends test data to the IP terminal to the terminal, determines that the connection between the IP terminal and the cell assembler / disassembler is normal when receiving a response to the test data from the IP terminal, and loops back. AT cell
By returning the data to the M unit, the test can be performed from the ATM section to the IP section, thereby reducing the network operation cost and simplifying the test control and minimizing the total test time. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an ATM network system according to one embodiment of the present invention.

FIG. 2 is a sequence chart showing an operation of the network system according to one embodiment of the present invention.

FIG. 3 shows a CL for a test request from the ATM device of FIG. 1;
5 is a flowchart illustrating an AD processing operation.

FIG. 4 is a flowchart showing a CLAD processing operation for a response from the IP terminal of FIG. 1;

FIG. 5 is a block diagram showing a configuration of a conventional ATM network system.

FIG. 6 is a block diagram showing a system configuration of a conventional ATM network system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CLAD 2 IP terminal 3 ATM apparatus 10 Ethernet terminator 11 Celling part 12 Decellularization part 13 ATM terminating part 14 IPICMP control part 15 OAM transfer control part 16 ATMLP control part 17 Control memory

Claims (15)

(57) [Claims] 1. A method for performing data transfer in an asynchronous transfer mode
I and I connected to the ATM network via a TM network and a cell assembling / disassembling device for assembling / disassembling cells for the ATM network.
In the network system including the P terminal, the A
An ATM test apparatus for testing a connection between a TM network and the IP terminal, wherein the ATM test apparatus executes a loopback test from the ATM network.
Detecting means for detecting whether a cell from the TM network is a loopback cell; determining means for determining whether the cell is addressed to the IP terminal when the detecting means detects the loopback cell; Sending means for sending test data between the cell assembling / disassembling apparatus and the IP terminal to the IP terminal when it is determined that the IP terminal is addressed to the IP terminal;
Return means for determining that the connection between the IP terminal and the cell assembling / disassembling apparatus is normal when receiving a response to the test data from the IP terminal, and returning the loopback cell to the ATM apparatus. And an ATM test apparatus, wherein the cell assembling / disassembling apparatus has the following. 2. The method according to claim 1, wherein the determining unit holds a loopback cell from the ATM network when the cell from the ATM network is addressed to the IP terminal, and the returning unit returns the held loopback cell to the IP terminal.
2. The ATM test apparatus according to claim 1, wherein when the connection between the P terminal and the cell assembling / disassembling apparatus is normal, the cell is returned to the ATM apparatus. 3. The system according to claim 1, wherein a loopback point of a loopback cell from the ATM device is set so as to indicate an IP address of the IP terminal.
Or the ATM test apparatus according to claim 2. 4. The transmitting means generates an ICMP type 8 datagram as the test data, and
To the terminal, and when the IP terminal receives the ICMP type 8 datagram, an ICMP is sent as a response to the test data.
4. The AT according to claim 1, wherein the AT is configured to transmit a type 0 datagram.
M test equipment. 5. The method according to claim 5, wherein the return means is the ICMP type 0.
5. The ATM according to claim 4, wherein when receiving the datagram, the connection between the IP terminal and the cell assembling / disassembling apparatus is determined to be normal.
Testing equipment. 6. A method for performing data transfer in an asynchronous transfer mode
I and I connected to the ATM network via a TM network and a cell assembling / disassembling device for assembling / disassembling cells for the ATM network.
In the network system including the P terminal, the A
An ATM test method for testing a connection between a TM network and the IP terminal, the method comprising: detecting whether a cell from the ATM network is a loopback cell when performing a loopback test from the ATM network. Determining whether the loopback cell is addressed to the IP terminal when the loopback cell is detected, and performing a test between the cell assembling / disassembling apparatus and the IP terminal when determined to be the IP terminal. And transmitting a response to the test data from the IP terminal, and determining that the connection between the IP terminal and the cell assembling / disassembling apparatus is normal. Returning the loopback cell to the ATM device in the cell assembling / disassembling device. 7. The step of determining whether or not the cell is addressed to the IP terminal includes: holding a loopback cell from the ATM network when determining that a cell from the ATM network is addressed to the IP terminal; The step of returning a back cell to the ATM device includes returning the held loop back cell to the ATM device when the connection between the IP terminal and the cell assembling / disassembling device is normal. 7. The ATM test method according to claim 6, wherein: 8. The ATM test method according to claim 6, wherein a loopback point of a loopback cell from the ATM device is set so as to indicate an IP address of the IP terminal. . 9. The step of transmitting the test data to the IP terminal includes generating an ICMP type 8 datagram as the test data and transmitting the datagram to the IP terminal, wherein the IP terminal transmits the ICMP type 8 datagram. ICMP as a response to the test data upon receiving a datagram
9. The ATM according to claim 6, wherein a datagram of type 0 is transmitted.
Test method. 10. The step of returning the loopback cell to the ATM device includes determining that a connection between the IP terminal and the cell assembling / disassembling device is normal when receiving the ICMP type 0 datagram. The ATM test method according to claim 9, wherein the test is performed. 11. A network comprising an ATM network for performing data transfer in an asynchronous transfer mode and an IP terminal connected to the ATM network via a cell assembling / disassembling device for assembling / disassembling cells for the ATM network. A recording medium in which an ATM test control program for causing said cell assembling / disassembling apparatus to perform a test of a connection between said ATM network and said IP terminal in a system is provided.
The test control program instructs the cell assembling / disassembling apparatus to execute the ATM control when a loopback test is performed from the ATM network.
Detecting whether a cell from the network is a loopback cell or not, and when the loopback cell is detected,
It is determined whether or not the packet is addressed to the P terminal. When it is determined that the packet is addressed to the IP terminal, test data between the cell assembling / disassembling apparatus and the IP terminal is transmitted to the IP terminal. Upon receiving a response to the test data, the I
It is determined that the connection between the P terminal and the cell assembling / disassembling device is normal, and the loopback cell is switched to the A terminal.
A recording medium storing an ATM test control program, which is returned to a TM device. 12. When the ATM test control program causes the cell assembling / disassembling apparatus to determine whether or not the cell is addressed to the IP terminal, the cell from the ATM network is used for the I / O.
When it is determined that the packet is addressed to the P terminal, a loopback cell from the ATM network is held, and the loopback cell is stored in the ATM.
12. The method according to claim 11, wherein, when the connection is returned to the device, the held loop-back cell is returned to the ATM device when the connection between the IP terminal and the cell assembling / disassembling device is normal. A recording medium on which an ATM test control program is recorded. 13. The ATM test control program causes the cell assembling / disassembling apparatus to set a loopback point of a loopback cell from the ATM apparatus so as to indicate the IP address of the IP terminal. Item 11
A recording medium on which the ATM test control program according to claim 12 is recorded. 14. When the ATM test control program causes the cell assembling / disassembling apparatus to transmit the test data to the IP terminal, the ATM test control program uses ICMP as the test data.
A type 8 datagram is generated and sent to the IP terminal, and when the IP terminal receives the ICMP type 8 datagram, the IP terminal responds to the test data by I
14. The AT according to claim 11, wherein a datagram of CMP type 0 is transmitted.
A recording medium on which an M test control program is recorded. 15. The ATM test control program causes the cell assembling / disassembling apparatus to send the loopback cell to the A
15. The method according to claim 14, wherein when returning the datagram of the ICMP type 0, the connection between the IP terminal and the cell assembling / disassembling apparatus is determined to be normal when the datagram is returned to the TM apparatus. A recording medium on which an ATM test control program is recorded.