JP2008148290A - Method and system for verifying connectivity of logical link - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accomplish verification of the connectivity of a logical link even in a network including a plurality of nodes with each node connected to an adjacent node through one or more data links and a control channel, like a GMPLS (Generalized Multi-Protocol Label Switching) network or the like. <P>SOLUTION: A node N1 that is the start point of a logical link L1 to be verified transmits a logical link verification request message, over a control channel, to a node N3 that is the end point of the logical link to be verified, thereby notifying that a connectivity verification test begins (steps B1, B2). Thereafter, the start-point node N1 transmits a physical link verification message to be verification data over the logical link L1 to be verified. When notified through the control channel that the test begins, the end-point node N3 carries out the connectivity verification test, based on whether or not it can receive the verification data through the logical link L1 to be verified, and returns a test result message to the start-point node N1 (steps B7, B8, B9). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a connectivity verification test technique for a logical link composed of a plurality of data links (physical links). In particular, the present invention includes a plurality of nodes such as a GMPLS (Generalized Multi Protocol Label Switching) network, The present invention relates to a logical link connectivity verification test method and system in a network connected via a data link and a control channel.

  A GMPLS network is conventionally known as a network including a plurality of nodes and connected between the nodes via a data link and a control channel. FIG. 9 is a block diagram illustrating a configuration example of a GMPLS network. As shown in the figure, the GMPLS network includes a plurality of nodes N1 to N4, and the nodes N1 to N4 are connected via data links DL1 to DL8 and control channels C21 to C24.

  The data links DL1 to DL8 are links through which actual data (user data) flows, and are generally realized by optical fibers. In general, two or more data links exist between nodes. On the other hand, the control channels C21 to C24 are links through which messages for controlling the GMPLS network such as routing and signaling flow. The nodes N1 to N4 have a switching function, a routing function, a signaling function, and the like, and have ports to which the data links DL1 to DL8 and the control channels C21 to C24 are connected.

  As described above, in the GMPLS network, since the data plane and the control plane are separated, the data link may be abnormal even if the control channel is normal. Therefore, in the GMPLS network, the data link connectivity verification function of LMP (Link Management Protocol) is used to perform the data link connectivity verification test according to the procedure shown in FIG.

  In FIG. 10, a data link connectivity verification test between the nodes N1 and N2 is performed.

  In step E1, in order to notify the start of the connectivity verification test, the node N1 transmits a Begin Verify message to the node N2 via the control channel C21. This Begin Verify message includes the identifier and number of data links to be subjected to the connectivity verification test.

  The node N2 that has received the Begin Verify message from the node N1 transmits the begin verify ack to the node N1 via the control channel C21 in step E2 in order to inform that the data link connectivity verification test is ready. Send.

  The node N1 that has received the Begin Verify Ack starts a data link connectivity verification test from the node N1 to the node N2. Specifically, in step E3, the node N1 transmits a Test message to the node N2 via the data link for performing the connectivity verification test (there may be a plurality of data links to be verified).

  In Step E4, when the node N2 normally receives the Test message on the data link, the node N2 transmits a Test Status Success message to the node N1 via the control channel C21. The node N2 transmits a Test Status Failure message to the node N1 via the control channel C21 when the Test message cannot be received even after a predetermined time has elapsed after receiving the Begin Verify.

  The node N1 that has received the Test Status Success message or the Test Status Failure message sends a Test Status Ack message via the control channel C21 in step E5 in order to notify that the Test Status Success message or the Test Status Failure message has been received. Sent to node N2.

  Next, in order to notify the node N2 of the end of the data link connectivity verification test, in step E6, the node N1 transmits an End Verify message to the node N2 via the control channel C21.

  Finally, in Step E7, the node N2 transmits an End Verify Ack message to the node N1 via the control channel C21, and ends the data link connectivity verification test.

  As described above, in the LMP message exchange, only the Test message is exchanged on the data link, and all other messages are exchanged on the control channel.

  In the GMPLS network, when communication is performed between any two nodes, it is necessary to set a path in advance in the data plane (a path is a set of continuous data links). In the GMPLS network, once a path is set, the path becomes one logical link, and communication is performed between two nodes via this logical link. For example, when communication is performed between the nodes N1 and N3 shown in FIG. 11, the logical link L1 composed of the data links DL2 and DL3 is connected between the node N1 and the node N3 using the control channels C21 and C22. Set and communicate via this logical link L1.

  Therefore, it is desirable to perform a connectivity verification test on a logical link composed of a plurality of continuous data links. However, since the data link connectivity verification function of LMP has only a data link connectivity verification function between physically adjacent nodes, a logical link connectivity verification test could not be performed.

  On the other hand, for example, a technique disclosed in Patent Document 1 is known as a logical link connectivity verification test technique. The technique described in Patent Document 1 performs a connectivity verification test of logical links that connect networks (including a plurality of exchanges). When performing the connectivity verification test, the maintenance person inputs a test command from the maintenance terminal to the starting network of the logical link to be tested. This test command includes information indicating a logical link to be tested (test target logical link). When the maintenance command is input, the start point network generates a test message whose destination is the end point network of the test target logical link and transmits it to the test target logical link indicated by the test command.

  In the intermediate network that exists between the start point network and the end point network, if the content of the data sent via the test target logical link is analyzed and it is recognized that the test message has been sent, it is included in the test message. A response message including the status information (normal, abnormal, etc.) of the network and the status information of the local network is generated and returned to the start network. Further, the intermediate network adds the status information of the own network to the received test message, and transmits the test message after the status information is added to the subsequent network via the test target logical link.

  In addition, in the end point network, when data is received via the test target logical link, the contents are analyzed to determine whether the data is a test message. If it is a test message, a response message including the network status information included in the test message and the status information of the own network is generated and returned to the start point network. In the start point network, the status information in the response message sent from each network is transmitted to the maintenance terminal, and the maintenance terminal displays the status information sent from the start point network on the screen.

JP-A-8-111682

  According to the technique described in Patent Document 1, it is possible to perform connectivity verification of logical links. However, this technique can be applied to a network in which data links and control channels are connected between nodes via the same communication path. For this reason, the technique described in Patent Document 1 cannot be applied to a network such as a GMPLS network including a plurality of nodes and connected between nodes via a data link and a control channel.

  Accordingly, an object of the present invention is to enable a logical link connectivity verification test even in a network such as a GMPLS network including a plurality of nodes and connected between nodes via a data link and a control channel. There is.

According to the present invention, there is provided a logical link connectivity verification method in a network including a plurality of nodes and connected between nodes via a data link and a control channel, and data for connecting between nodes constituting the network. The start node of the test target logical link set by the link starts the connectivity verification test of the test target logical link with respect to the end point node of the test target logical link using a control channel connecting the nodes. Connectivity verification test start step to be notified;
A verification data transmission step in which the start point node transmits arbitrary verification data via the test target logical link, and connection based on whether or not the end point node has received data via the test target logical link And a test result returning step of performing a test for verifying the authenticity and returning the test result to the start point node through the control channel.

  According to the present invention, it is possible to perform a logical link connectivity verification test in a network such as a GMPLS network including a plurality of nodes and connected between nodes via a data link and a control channel.

  Next, the best mode for carrying out the invention will be described in detail with reference to the drawings.

[First embodiment of the present invention]
The present invention is applied to a network such as a GMPLS network including a plurality of nodes and connected between nodes via a data link and a control channel. Hereinafter, in order not to make the description complicated, a case where the present invention is applied to the GMPLS network shown in FIG. 9 will be described as an example.

  First, nodes used in the logical link connectivity verification system according to the first embodiment of the present invention will be described. Since each of the nodes N1 to N4 shown in FIG. 9 has the same circuit configuration, the circuit configuration will be described below using the node N2 as a representative.

  FIG. 1 is a block diagram illustrating a configuration example of the node N2 among the nodes N1 to N4 illustrated in FIG. As shown in the figure, the node N2 is a port to which a control channel processing unit 11, a logical link verification processing unit 12, a cross-connect switch 13, a storage device 14, and data links DL1 to DL4, N7, N8 are connected. P21 to P24, P27, and P28, ports P221 and P222 to which the control channels C21 and C22 are connected, and a test port P2 to which the test terminal device 21 realized by a personal computer or the like can be connected are provided.

  The storage device 14 includes a logical link information storage unit 15, a data link information storage unit 16, and a cross-connect setting information storage unit 17.

  In the logical link information storage unit 15, logical link information for associating a logical link with a data link connected to the node N2 among the data links constituting the logical link is registered. Now, for example, as shown in FIG. 11, if a logical link L1 composed of data links DL2 and DL3 is set between the nodes N1 and N3, the contents of the logical link information storage unit 15 of the node N2 are as shown in FIG. 2 (A). The example in the figure shows that the data links DL2 and DL3 among the data links constituting the logical link L1 are connected to the node N2 as an incoming data link and an outgoing data link, respectively. Note that in the start node N1 that is the start point of the logical link L1, only the outgoing data link ID “DL2” is registered in association with the logical link ID “L1”, and in the end node N3, the logical link ID “L1” is registered. Only the incoming data link ID “DL3” is registered in association.

  In the data link information storage unit 16, data link information for associating the data link with the port is registered. FIG. 2B is a diagram showing an example of the contents of the data link information storage unit 16 of the node N2. The example in the figure shows that the data links DL1 to DL4, DL7, and DL8 are connected to the ports P21 to P24, P27, and P28.

  In the cross-connect setting information storage unit 17, setting information for the cross-connect switch in the own node N2 is registered. FIG. 2C is a diagram showing an example of the contents of the cross-connect setting information storage unit 17 of the node N2, and the example of FIG. 2 shows that the port P22 and the port P23 are connected by a cross-connect switch. ing.

  The control channel processing unit 11 has the following functions in addition to the existing functions such as the function of setting a logical link in accordance with the setting instruction of the logical link sent via the control channels C21 and C22. .

Test start instruction function: When the test terminal device 21 is connected to the test port P2 and the node becomes the start node (in this case, the node N1), a connectivity verification test is performed from the test terminal device 21. When a test start instruction including a logical link ID of a logical link (test target logical link) is input, the node starts a connectivity verification test for the end node of the test target logical link via the control channel. And a verification data transmission instruction is output to the logical link verification processing unit 12. The verification data transmission instruction includes the port ID of the port to which the data link for transmitting verification data is connected.

Test execution instruction function: When notified of the start of the connectivity verification test of the test target logical link via the control channel, the logical link verification processing unit 12 in its own node (here, the nodes N2 and N3) is notified. A verification instruction for instructing to perform a connectivity verification test of the test target logical link is output. The verification instruction includes the port ID of the port to which the data link constituting the test target logical link is connected.

Test result return function: Returns the test result of the logical link verification processing unit 12 to the start node of the test target logical link via the control channel (here, nodes N2 and N3).

  The logical link verification processing unit 12 has the following functions.

A function of transmitting verification data to the port designated by the verification data transmission instruction from the control channel processing unit 11. The verification data may be arbitrary.

A function for performing a connectivity verification test based on whether or not data could be transmitted / received via the port specified by the verification instruction from the control channel processing unit 11.

  The node N2 having such a function can be realized by a computer. When the node N2 is realized by a computer, for example, the following is performed. A disk, a semiconductor memory, and other recording media on which a program for causing the computer to function as the control channel processing unit 11 and the logical link verification processing unit 12 is prepared are prepared, and the computer reads the program. The computer implements the control channel processing unit 11 and the logical link verification processing unit 12 on its own computer by controlling its own operation according to the read program.

[Operation of First Embodiment]
Next, the operation of the present embodiment will be described in detail.

  FIG. 3 is a sequence diagram for explaining the operation when the connectivity verification test of the logical link L1 shown in FIG. 11 is performed. FIG. 4 is a diagram showing in detail the relationship between the data link and the logical link in the node N2. It is. Here, the connectivity verification test of the logical link L1 set via the node N2 is performed between the node N1 and the notebook N3. Hereinafter, in each node Nx (x = 1, 2, 3), the control channel processing unit 11, the logical link verification processing unit 12, the cross-connect switch 13, the storage device 14, the logical link information storage unit 15, and the data link information storage unit 16 and the cross-connect setting information storage unit 17 are respectively provided with reference numbers 11. x, 12. x, 13. x, 14. x, 15. x, 16. x, 17. It shall be shown by x. Similarly, test port P2 is connected to P2. Ports connected to the data links DL1, DL2, DL3, and DL4 are indicated by Px1, Px2, Px3, and Px4, respectively, and ports connected to the control channels C21 and C22 are indicated by Px21 and Px22, respectively.

  FIG. 3 shows messages exchanged between the nodes N1 to N3 after the logical link L1 is set. The messages exchanged in steps B5 and B6 pass through the data link, and the messages exchanged in steps B1 to B4 and B7 to B13 pass through the control channel.

  When performing a connectivity verification test on the logical link L1, the person in charge of the test connects the test terminal device 21 to the start node N1 of the logical link L1, and inputs a test start instruction. This test start instruction includes the logical link ID “L1” of the logical link L1.

  When the test start instruction including the logical link ID “L1” is input from the test terminal device 21, the control channel processing unit 11.1 in the node N1 first notifies the start of the connectivity verification test of the logical link L1. In order to do this, a logical link verification request message is transmitted to the node N2 via the control channel C21 (step B1). This logical link verification request message includes the logical link ID “L1”.

  When the control channel processing unit 11.2 in the node N2 receives the logical link verification request message including the logical link ID “L1” via the control channel C21, the own node N2 is not the end node of the logical link L1, A logical link verification request message is transmitted to the node N3 via the control channel C22 (step B2). Further, the control channel processing unit 11.2 in the node N2 outputs a verification instruction to the logical link verification processing unit 12.2. This verification instruction includes the port IDs “P22” and “P23” of the ports P22 and P23 connected to the input data link DL2 and the output data link DL3 constituting the logical link L1. As a result, the logical link verification processing unit 12.2 starts monitoring the ports P22 and P23. That is, it is monitored whether data is input via the port P22 and whether data is output via the port P23. When it is detected that data is input via the port P22 or when data is output via the port P23, this is notified to the control channel processing unit 11.2. The port IDs “P22” and “P23” of the ports P22 and P23 connected to the incoming data link DL2 and the outgoing data link DL3 constituting the logical link L1 are the logical link information storage unit 15.2 and the data link information storage. It can be obtained from the contents of part 16.2.

  When the control channel processing unit 11.3 in the node N3 receives the logical link verification request message via the control channel C22, since the own node N3 is the end node of the logical link L1, the logical link verification response message is sent to the node N2. (Step B3). Further, the control channel processing unit 11.3 in the node N3 outputs a verification instruction to the logical link verification processing unit 12.3. This verification instruction includes the port ID “P33” of the port P33 (not shown) of the own node N3 connected to the incoming data link DL3 constituting the logical link L1. As a result, the logical link verification processing unit 12.3 starts monitoring the port P33. When it is detected that data has been input via the port P33, this is notified to the control channel processing unit 11.3.

  When receiving the logical link verification response message via the control channel C22, the control channel processing unit 11.2 in the node N2 transmits it to the node N1 (step B4).

  When receiving the logical link verification response message, the control channel processing unit 11.1 in the node N1 outputs a verification instruction to the logical link verification processing unit 12.1. This verification instruction includes the port ID “P2212” of the port P2212 connected to the data link DL2 constituting the logical link L1. As a result, the logical link verification processing unit 12.1 in the node N1 transmits a physical link verification message (verification data) via the port P2212 and the data link DL2. The contents of the physical link verification message may be arbitrary.

  The physical link verification message sent to the node N2 is sent to the data link DL3 via the port P22, the cross-connect switch 13.2, and the port P23 (step B6). As a result, the logical link verification processing unit 12.2 in the node N2 detects that data has been input via the port P22 and that data has been output via the port P23, and this is detected by the control channel. Notify the processing unit 11.2. When the control channel processing unit 11.2 receives the above notification within a predetermined time after receiving the logical link verification request message, the control channel processing unit 11.2 sends a test result message indicating that the test has been successful via the control channel C21. Return to N1. On the other hand, when the notification cannot be received within a predetermined time, a test result message indicating that the test has failed is returned to the start node N1 (step B7). Note that the test result message includes the node ID of the node N2. Upon receiving the test result message, the control channel processing unit 11.1 in the node N1 transmits it to the test terminal device 21, and the test terminal device 21 displays the test result message sent from the node N1 on the display unit ( (Not shown).

  The node N3 performs the same process as the node N2, and a test result message is transmitted to the node N2 via the control channel C22 (step B8). The control channel processing unit 11.2 in the node N2 transmits the test result message sent from the node N3 to the starting point node N1 via the control channel C21 (step B9).

  Upon receiving the test result message from the end node N3, the control channel processing unit 11.1 in the node N1 transmits it to the test terminal device 21 and transmits a verification end message to the nodes N2 and N3 (step B10). , B11).

  Upon receiving the verification end message, the control channel processing unit 11.3 in the node N3 transmits a verification end response message to the start point node N1 via the node N2 (steps B12 and B13). Thus, the node N1 to node N3 direction connectivity verification test is completed. Next, the connectivity verification test in the direction from the node N3 to the node N1 is performed in the same manner to verify the connectivity in both directions of the logical link L1. Thereby, the connectivity verification test of the logical link L1 is completed.

[Effect of the first embodiment]
According to the present embodiment, it is possible to perform a logical link connectivity verification test in a network such as a GMPLS network including a plurality of nodes and connected between nodes via a data link and a control channel. The reason is that the start node N1 of the test target logical link L1 notifies the end point node N3 of the test target logical link L1 of the start of the connectivity verification test of the test target logical link L1 via the control channels C21 and C22. It is because it tries to do. In other words, the end node N3 can recognize the start of the connectivity verification test of the test target logical link L1 based on the notification sent from the start node N1 via the control channels C21 and C22. A connectivity verification test can be performed even in a network including nodes and connected between nodes via a data link and a control channel.

[Second Embodiment of the Present Invention]
Next, a second embodiment of the present invention will be described. In the first embodiment, the connectivity verification test of a logical link composed of a plurality of data links was performed. In the second embodiment, the connectivity verification of a logical link composed of a plurality of logical links was performed. Perform the test.

  FIG. 5 shows a schematic diagram in which two logical links LC1 and LC2 exist in a network composed of five nodes N51 to N55. The nodes N51 to N55 have the same configuration as the node N2 shown in FIG. The logical link LC1 is set between the node N51, the node N52, and the node N53, and the logical link LC2 is set between the node N53, the node N54, and the node N55. An example in which a new logical link LC3 is generated using the logical links LC1 and LC2 of FIG. 5 is shown in FIG. Once created, each logical link plays the same role as a data link. 7A to 7C show examples of contents of the link information storage unit 15, the data link information storage unit 16, and the cross-connect setting information storage unit 17 in the node N53 in FIG. Since the logical link LC3 uses the logical links LC1 and LC2 in the same manner as the data link, the logical link information “LC1” and “LC2” of the logical links LC1 and LC2 are the data link IDs and the logical link information storage unit 15 and the data link. Registered in the information storage unit 16. Although not shown in FIG. 7A, logical link information that associates a logical link with a data link is also registered in the logical link information storage unit 15 as in FIG. 2A. Although not shown in FIG. 7B, data link information for associating a data link with a port is also registered in the data link information storage unit 16 as in FIG. 2B.

[Operation of Second Embodiment]
Next, the operation of the present embodiment will be described. Note that the logical link LC1 is already set up in the node N51-node N52-node N53, the logical link LC2 is already set up in the node N53-node N54-node N55, and the logical link LC3 using the logical links LC1, LC2 is already set up. Suppose that

  Referring to FIG. 8, first, in step D1, a connectivity verification test of the logical link C1 is performed in the same procedure as that shown in FIG. When the connectivity of the logical link LC1 is confirmed, in step D2, the node N51 transmits a logical link verification request message to the node N53.

  Next, in Step D3, the node N53 transmits a logical link verification response message to the node N51.

  Next, in step D4, a connectivity verification test of the logical link LC2 is performed. When the connectivity of the logical link LC2 is confirmed, in step D5, the node N53 transmits a logical link verification end message to the node N51, and in step D6, the node N51 transmits a logical link verification end response message to the node N53. To do.

  In subsequent steps D7 to D18, connectivity verification of the logical link LC3 is performed.

  In step D7, the node N51 transmits a logical link verification request message to the node N53, and in step D8, the node N53 transfers the logical link verification request message to the node N55. The logical link verification request message includes the logical link ID “LC3” of the logical link to be verified.

  Next, in Step D9, the node N55 transmits a logical link verification response message to the node N53, and in Step D10, the node N53 transfers the logical link verification response message to the node N51.

  Next, in Step D11, the node N51 transmits a physical link verification message to the node N53 via the logical link LC1 (data link).

  Next, in Step D12, the node N53 transmits a physical link verification message to the node N55 via the logical link LC2 (data link).

  When the connectivity of the logical link LC3 (data link) can be confirmed, the node N55 transmits a test result message indicating the connectivity verification test success to the node N53. A test result message is transmitted (step D13).

  Next, in Step D14, the node N53 transfers the test result message to the node N51.

  Next, in step D15, the node N51 transmits a verification end message to the node N53, and in step D16, the node N53 transfers the verification end message to the node N55.

  Next, in step D17, the node N55 transmits a verification end response message to the node N53, and in step D18, the node N53 transfers the verification end response message to the node N51.

[Effects of Second Embodiment]
According to the present embodiment, it is possible to verify connectivity of the test target logical link LC3 including the plurality of logical links LC1 and LC2. The reason is that the start node N51 of the test target logical link LC3 notifies the end point node N55 of the test target logical link LC3 of the start of the connectivity verification test via the control channel.

[Various Aspects of the Present Invention]
A first logical link connectivity verification method according to the present invention includes:
The starting point node of the test target logical link set by the data link connecting between the nodes constituting the network uses the control channel connecting the nodes to the end point node of the test target logical link. A connectivity verification test start step for notifying the start of the logical link connectivity verification test;
A verification data transmission step in which the start point node transmits arbitrary verification data via the test target logical link;
A test result return step of performing a connectivity verification test based on whether or not the end node has received data via the test target logical link and returning the test result to the start point node via the control channel; It is characterized by including.

The second logical link connectivity verification method according to the present invention is the first logical link connectivity verification method,
In the connectivity verification test start step, the start node notifies the intermediate node on the test target logical link of the start of the connectivity verification test of the test target logical link using the control channel. ,and,
The intermediate node side performs a connectivity verification test based on whether or not data can be transmitted / received via the test target logical link, and includes an intermediate node side test result return step of returning the test result to the start node. And
According to a third logical link connectivity verification method of the present invention, in the first or second logical link connectivity verification method,
The test target logical link includes a plurality of logical links.

A fourth logical link connectivity verification method according to the present invention is any one of the first to third logical link connectivity verification methods,
The network is a GMPLS network.

A first logical link connectivity verification system according to the present invention includes:
A logical link connectivity verification system in a network including a plurality of nodes and connected between nodes via a data link and a control channel,
The plurality of nodes are respectively
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, connection of the test target logical link to an end node of the test target logical link via the control channel Notification of starting a verification test, and transmitting arbitrary verification data to the logical link to be tested, and being notified of starting a connectivity verification test of the logical link to be tested through the control channel A verification means for performing a connectivity verification test based on whether data has been received via the test target logical link and returning a test result to the start node of the test target logical link via the control channel. It is characterized by that.

A second logical link connectivity verification system according to the present invention is the following logical link connectivity verification system:
The verification means
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, the test target is also applied to an intermediate node on the test target logical link using the control channel. When notifying the start of the connectivity verification test of the logical link and notifying the start of the connectivity verification test of the test target logical link via the control channel, the own node is an intermediate node of the test target logical link. On the condition that the data is transmitted / received via the test target logical link, a connectivity verification test is performed, and the test result is returned to the start node.

A third logical link connectivity verification system according to the present invention is the first or second logical link connectivity verification system,
The test target logical link is composed of a plurality of logical links.

A fourth logical link connectivity verification system according to the present invention is the first logical link connectivity verification system,
The verification means
Arbitrary verification data is transmitted to the test target logical link instructed by the verification data transmission instruction, and the connectivity verification test is performed based on whether or not the data has been received via the test target logical link instructed by the verification instruction. A logical link verification processing unit;
When the test target logical link for performing the connectivity verification test is instructed, the end point node of the test target logical link is notified via the control channel to start the test verification logical link link. At the same time, when a verification data transmission instruction is output to the logical link verification processing unit and it is notified that the connectivity verification test of the test target logical link is started via the control channel, the logical link in its own node A verification instruction that instructs the link verification processing unit to perform a connectivity verification test of the test target logical link is output, and the test result of the logical link verification processing unit in response to the verification instruction is output via the control channel. And a control channel processing unit that returns to the start node of the test target logical link.

A fifth logical link connectivity verification system according to the present invention is any one of the first to fourth logical link connectivity verification systems,
The network is a GMPLS network.
The first node according to the present invention is:
A node including a plurality of nodes and constituting a network element connected between the nodes via a data link and a control channel;
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, connection of the test target logical link to an end node of the test target logical link via the control channel Notification of starting a verification test, and transmitting arbitrary verification data to the logical link to be tested, and being notified of starting a connectivity verification test of the logical link to be tested through the control channel A verification means for performing a connectivity verification test based on whether data has been received via the test target logical link and returning a test result to the start node of the test target logical link via the control channel. It is characterized by that.

The second node according to the present invention is the following:
The verification means
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, the test target is also applied to an intermediate node on the test target logical link using the control channel. When notifying the start of the connectivity verification test of the logical link and notifying the start of the connectivity verification test of the test target logical link via the control channel, the own node is an intermediate node of the test target logical link. On the condition that the data is transmitted / received via the test target logical link, a connectivity verification test is performed, and the test result is returned to the start node.

The third node according to the present invention is the first or second node,
The test target logical link is composed of a plurality of logical links.

The fourth node according to the present invention is the first node,
The verification means
Arbitrary verification data is transmitted to the test target logical link instructed by the verification data transmission instruction, and the connectivity verification test is performed based on whether or not the data has been received via the test target logical link instructed by the verification instruction. A logical link verification processing unit;
When the test target logical link for performing the connectivity verification test is instructed, the end point node of the test target logical link is notified via the control channel to start the test verification logical link link. At the same time, when a verification data transmission instruction is output to the logical link verification processing unit and it is notified that the connectivity verification test of the test target logical link is started via the control channel, the logical link in its own node A verification instruction that instructs the link verification processing unit to perform a connectivity verification test of the test target logical link is output, and the test result of the logical link verification processing unit in response to the verification instruction is output via the control channel. And a control channel processing unit that returns to the start node of the test target logical link.

The first program according to the present invention is:
A program for realizing, by a computer, a node that includes a plurality of nodes and is a component of a network in which nodes are connected via a data link and a control channel.
The computer,
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, connection of the test target logical link to an end node of the test target logical link via the control channel Notification of starting a verification test, and transmitting arbitrary verification data to the logical link to be tested, and being notified of starting a connectivity verification test of the logical link to be tested through the control channel Function as verification means for performing a connectivity verification test based on whether data has been received via the test target logical link and returning a test result to the start node of the test target logical link via the control channel Let

The second program according to the present invention is the first program,
The verification means
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, the test target is also applied to an intermediate node on the test target logical link using the control channel. When notifying the start of the connectivity verification test of the logical link and notifying the start of the connectivity verification test of the test target logical link via the control channel, the own node is an intermediate node of the test target logical link. On the condition that the data is transmitted / received via the test target logical link, a connectivity verification test is performed, and the test result is returned to the start node.

A third program according to the present invention is the first program,
The verification means
Arbitrary verification data is transmitted to the test target logical link instructed by the verification data transmission instruction, and the connectivity verification test is performed based on whether or not the data has been received via the test target logical link instructed by the verification instruction. A logical link verification processing unit;
When the test target logical link for performing the connectivity verification test is instructed, the end point node of the test target logical link is notified via the control channel to start the test verification logical link link. At the same time, when a verification data transmission instruction is output to the logical link verification processing unit and it is notified that the connectivity verification test of the test target logical link is started via the control channel, the logical link in its own node A verification instruction that instructs the link verification processing unit to perform a connectivity verification test of the test target logical link is output, and the test result of the logical link verification processing unit in response to the verification instruction is output via the control channel. And a control channel processing unit that returns to the start node of the test target logical link.

[Action]
When performing a connectivity verification test of a logical link set by a data link connecting nodes, the starting node of the logical link to be tested (test target logical link) uses the control channel to The end point node is notified of the start of the connectivity verification test of the test target logical link, and then arbitrary verification data is transmitted via the test target logical link. When the end node is notified of the start of the test via the control channel, the end point node performs a connectivity verification test based on whether or not data can be received via the test target logical link, and the test result is transmitted via the control channel. Return to the start node.

  The present invention is suitable for performing a logical link connectivity verification test in a network including a plurality of nodes and connected between nodes via a data link and a control channel, such as a GMPLS network.

It is a block diagram which shows the structural example of the node used in 1st Embodiment of the logical link connectivity verification system concerning this invention. It is a figure which shows the example of the content of the logical link information storage part 15, the data link information storage part 16, and the cross-connect setting information storage part 17 of the node N2 used in 1st Embodiment. It is a sequence diagram for demonstrating operation | movement of 1st Embodiment. FIG. 4 is a diagram showing in detail a relationship between a data link and a logical link in the node N2. It is a figure for demonstrating the logical link comprised from a some logical link. It is a figure for demonstrating the logical link comprised from a some logical link. It is a figure which shows the example of the content of the logical link information storage part 15, the data link information storage part 16, and the cross-connect setting information storage part 17 of the node N53 used in 2nd Embodiment. It is a sequence diagram for demonstrating operation | movement of 2nd Embodiment. It is a block diagram which shows the structural example of a GMPLS network. It is a sequence diagram for demonstrating the connectivity verification test of the conventional data link. It is a block diagram for demonstrating the logical link of a GMPLS network.

Explanation of symbols

N1-N4, N51-N55 ... node
11… Control channel processor
12… Logical link verification processor
13… Cross-connect switch
14 ... Storage device
15 ... Logical link information storage unit
16 ... Data link information storage
17… Cross-connect setting information storage
21 ... Test terminal
L1 ... Logical link to be tested
LC1 to LC3 ... Logical link
DL1 to DL8 ... Data link
C11 to C24: Control channel
P21 to P24, P27, P28, P221, P222, P2, P531, P532, P2 ... Port

Claims (16)

In a logical link connectivity verification method in a network including a plurality of nodes and connected between nodes via a data link and a control channel,
The starting node of the test target logical link set by the data link connecting the nodes constituting the network uses the control channel connecting the nodes to the end node of the test target logical link. A connectivity verification test start step for notifying the start of the connectivity verification test of the target logical link;
A verification data transmission step in which the start point node transmits arbitrary verification data via the test target logical link;
A test result return step for performing a connectivity verification test based on whether or not the end node has received data via the test target logical link and returning a test result to the start node via the control channel;
A logical link connectivity verification method comprising: The logical link connectivity verification method according to claim 1,
In the connectivity verification test start step, the start node notifies the intermediate node on the test target logical link of the start of the connectivity verification test of the test target logical link using the control channel. ,and,
The intermediate node side performs a connectivity verification test based on whether or not data can be transmitted / received via the test target logical link, and includes an intermediate node side test result return step of returning the test result to the start node. Logical link connectivity verification method. The logical link connectivity verification method according to claim 1 or 2,
The logical link connectivity verification method, wherein the test target logical link is composed of a plurality of logical links. The logical link connectivity verification method according to any one of claims 1 to 3,
A logical link connectivity verification method, wherein the network is a GMPLS network. A logical link connectivity verification system in a network including a plurality of nodes and connected between nodes via a data link and a control channel,
Each of the plurality of nodes includes a verification unit, and the verification unit includes:
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, connection of the test target logical link to an end node of the test target logical link via the control channel Notification of starting the verification test, and sending arbitrary verification data to the test target logical link,
When it is notified through the control channel that the connectivity verification test of the test target logical link is to be started, the connectivity verification test is performed based on whether data has been received through the test target logical link. , Returning the test result to the start node of the logical link to be tested through the control channel,
A logical link connectivity verification system characterized by the above. The logical link connectivity verification system according to claim 5,
The verification means
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, the test target is also applied to an intermediate node on the test target logical link using the control channel. Notify the start of logical link connectivity verification test,
When it is notified via the control channel that a test for verifying connectivity of the test target logical link is to be started, the test target logical link is provided on the condition that the own node is an intermediate node of the test target logical link. A connectivity verification test is performed based on whether or not data can be transmitted / received via the network, and a test result is returned to the start node.
A logical link connectivity verification system characterized by the above. The logical link connectivity verification system according to claim 5 or 6,
The logical link connectivity verification system, wherein the test target logical link is composed of a plurality of logical links. The logical link connectivity verification system according to claim 5,
The verification means
Arbitrary verification data is transmitted to the test target logical link instructed by the verification data transmission instruction, and the connectivity verification test is performed based on whether or not the data has been received via the test target logical link instructed by the verification instruction. A logical link verification processing unit;
When the test target logical link for performing the connectivity verification test is instructed, the end point node of the test target logical link is notified via the control channel to start the test verification logical link link. At the same time, when a verification data transmission instruction is output to the logical link verification processing unit and it is notified that the connectivity verification test of the test target logical link is started via the control channel, the logical link in its own node A verification instruction that instructs the link verification processing unit to perform a connectivity verification test of the test target logical link is output, and the test result of the logical link verification processing unit in response to the verification instruction is output via the control channel. A control channel processing unit to be returned to the start node of the test target logical link;
A logical link connectivity verification system comprising: The logical link connectivity verification system according to any one of claims 5 to 8,
A logical link connectivity verification system, wherein the network is a GMPLS network. A node including a plurality of nodes and constituting a network element connected between the nodes via a data link and a control channel;
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, connection of the test target logical link to an end node of the test target logical link via the control channel Notification of starting a verification test, and transmitting arbitrary verification data to the logical link to be tested, and being notified of starting a connectivity verification test of the logical link to be tested through the control channel A verification means for performing a connectivity verification test based on whether data has been received via the test target logical link and returning a test result to the start node of the test target logical link via the control channel. A node characterized by The node of claim 10, wherein
The verification means
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, the test target is also applied to an intermediate node on the test target logical link using the control channel. When notifying the start of the connectivity verification test of the logical link and notifying the start of the connectivity verification test of the test target logical link via the control channel, the own node is an intermediate node of the test target logical link. A node that performs a connectivity verification test based on whether or not data can be transmitted / received via the test target logical link, and returns a test result to the start node. The node according to claim 10 or 11,
The node, wherein the test target logical link is composed of a plurality of logical links. The node of claim 10, wherein
The verification means
Arbitrary verification data is transmitted to the test target logical link instructed by the verification data transmission instruction, and the connectivity verification test is performed based on whether or not the data has been received via the test target logical link instructed by the verification instruction. A logical link verification processing unit;
When the test target logical link for performing the connectivity verification test is instructed, the end point node of the test target logical link is notified via the control channel to start the test verification logical link link. At the same time, when a verification data transmission instruction is output to the logical link verification processing unit and it is notified that the connectivity verification test of the test target logical link is started via the control channel, the logical link in its own node A verification instruction that instructs the link verification processing unit to perform a connectivity verification test of the test target logical link is output, and the test result of the logical link verification processing unit in response to the verification instruction is output via the control channel. A control channel processing unit to be returned to the start node of the test target logical link;
A node characterized by comprising: A program for realizing, by a computer, a node that includes a plurality of nodes and is a component of a network in which nodes are connected via a data link and a control channel.
The computer,
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, connection of the test target logical link to an end node of the test target logical link via the control channel Notification of starting a verification test, and transmitting arbitrary verification data to the logical link to be tested, and being notified of starting a connectivity verification test of the logical link to be tested through the control channel Function as verification means for performing a connectivity verification test based on whether data has been received via the test target logical link and returning a test result to the start node of the test target logical link via the control channel Program to let you. The program according to claim 14, wherein
The verification means
When it is instructed to perform a connectivity verification test of a test target logical link composed of a plurality of data links, the test target is also applied to an intermediate node on the test target logical link using the control channel. When notifying the start of the connectivity verification test of the logical link and notifying the start of the connectivity verification test of the test target logical link via the control channel, the own node is an intermediate node of the test target logical link. On the condition that the data is transmitted / received through the logical link to be tested, a connectivity verification test is performed and a test result is returned to the start node. The program according to claim 14, wherein
The verification means
Arbitrary verification data is transmitted to the test target logical link instructed by the verification data transmission instruction, and the connectivity verification test is performed based on whether or not the data has been received via the test target logical link instructed by the verification instruction. A logical link verification processing unit;
When the test target logical link for performing the connectivity verification test is instructed, the end point node of the test target logical link is notified via the control channel to start the test verification logical link link. At the same time, when a verification data transmission instruction is output to the logical link verification processing unit and it is notified that the connectivity verification test of the test target logical link is started via the control channel, the logical link in its own node A verification instruction that instructs the link verification processing unit to perform a connectivity verification test of the test target logical link is output, and the test result of the logical link verification processing unit in response to the verification instruction is output via the control channel. A control channel processing unit to be returned to the start node of the test target logical link;
A program characterized by comprising:

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