JPS59223045A - Network simulating system - Google Patents

Abstract

PURPOSE:To prepare easily a test sequence, and to execute coping even when abnormality is generated, by defining a node having a layer, and providing a control table in accordance with the node concerned, so that a communication between said nodes and a communication between said node and a device to be tested can be executed. CONSTITUTION:In a testing tool system 2', a coupling test of a node A of a divice to be tested 1 can be executed by adopting a conception of a pseudo link, for instance, such as between a node B and C, between pseudo nodes. Control tables 6B, 6C corresponding to the node defines an attribute of the node. A data to a node B from A is checked by B, and inputted to an application level of B, but a data to C from A is checked by DLC and TL in B, it is known by seeing an address of a TL header that said data is addressed to C, and it is transferred again to DLC of C through a pseudo link 5 from DLC. In case the nodes C and A execute a communication, C knows by a definition of a circuit that it will do that a data addressed to A is also sent to B, and sends the data to B. In this case, in case of the pseudo link, the data of a transmitting queue of C is reconnected to a receiving queue of B, and B cope with it in the same way as a transmission from an actual link. As a result, when the address is read at the time of its delivery to TL, it is known that the data is addressed to A, therefore, it is sent out to an actual link 4 toward A from DLC.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention creates a program that simulates a plurality of nodes in a test tool system, and incorporates the concept of pseudo links between the plurality of nodes to create a node. Test and simulate the network by communicating between
This relates to a network simulation method for creating sequences.

[Prior art and problems]

Figure 1 shows an example of a network system, Figure 2 shows an example of a network system.
The figure is a diagram explaining the conventional test method, and Figure 3 is the conventional MT
It is a figure showing an example of S method. In the figure, Jl indicates a device under test, 2 indicates a test tool system, and 3 indicates a DDX (data communication network, packet switching network).

In a network configuration consisting of multiple nodes, for example, nodes A to D as shown in FIG.
When performing an integration test for , it is necessary to create a test sequence that considers all nodes B, C, and D. Various so-called test data given to such a combination test are referred to herein as a test sequence.

In the conventional test method, as shown in FIG.
Node A is tested using test tool system 2, but test tool system 2 tests node B.
It is necessary to develop a test sequence that takes into account nodes , C, and D. A specific conventional method is the MTS (multi-terminal simulator) system shown in FIG. As is clear from FIG. 3, in this MTS method, the node A of the device under test 10 and the valley nodes (B, C, D) of the test tool O system 2 face each other, and as shown in FIG. It is not possible to test with the network configuration shown in . Therefore, if you create and give data corresponding to each node, you can create a test sequence, but if you create data with the image that the data can last on the line, you will need to create data for each node. It has to be taken into consideration and the timing is difficult. For example, when performing a test that causes a failure,
Originally, each node is independent, and the entire node may become involved in the occurrence of one abnormal state.

However, in such a case, the timing becomes quite complicated and it is very difficult to create a sequence.

[Purpose of the invention]

The present invention is based on the above consideration, and provides a network simulation method that facilitates the creation of a test sequence for a network configuration and enables corresponding processing even when an abnormality occurs. The purpose is to

[Structure of the invention]

To this end, the network simulation method of the present invention is a network simulation method for a test tool system that performs a connection test using a device under test as one of the nodes constituting a network.
The system has a layer that handles communication rules between lines, communication rules between each node of the network, data flow, transmission right control, etc. for each node other than the above-mentioned device under test among the nodes that make up the network. At the same time, a control table is provided that defines the attributes of each node and the rules handled by each of the layers above, and communication between the nodes defined above and each node defined above and the device under test is established. Special V1. That is.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a diagram showing one embodiment of the present invention, and FIG. 5 is a diagram showing one embodiment of the present invention.
FIG. 6 is a diagram showing a data format, and FIG. 7 is a diagram illustrating data exchange via a pseudo link to which the present invention is applied. In the figure, 1 is the MM under test, and 2' is the test tool.
System, 4 is lol link, 5 is pseudo link, 6B and 6C
indicates a control table.

As an embodiment of the network simulation method of the present invention is shown in FIG. By incorporating the concept of a pseudo link such as the connection with D, it is possible to perform a connection test of the node A of the device under test 1 under the network configuration shown in FIG. Therefore, data is transmitted and received between each pseudo node as if the lines were connected, and as shown in FIG. 4, node B7a? Communication between node A and node C via node B, communication between node FA and node 0 via node B (communication between node E and node C or node 0 via node A and node B) By doing this, it is possible to easily test the relay function at node A. Furthermore, as a result of this, the test sequence to be created can be created by focusing on each node.

In addition, if the program that simulates each node is configured to automatically perform processing when an abnormality occurs, it will be possible to ensure that each node has comprehensive versatility in processing when an abnormality occurs. Tests can be performed.

Next, the configuration of each node and an example of communication between valley nodes will be explained with reference to FIGS. 5 to 7. Each node has a fifth
As shown in the figure, DLC (Data Link Control) is the layer that mainly handles communication rules (protocols) between lines, and TL is the layer that handles communication rules between the destination and source of the network. There are layers such as a data unit control unit (DUC) as a layer that handles transport level unit (transport level unit), data flow, transmission right control, and the like. On the other hand, the format of the data sent on the link is as shown in Figure 6, depending on the layer configuration of the node.
header, DUC header, and application
Level data follows.

Further, the test tool system 21 is provided with control tables 6B and 6c corresponding to each node. This control table 6B, 6
C is node attributes, such as information such as node name B for node B, node A connected to link 4, node C connected to pseudo link 5, and protocol information (at each level). It defines the terms of communication, etc. Therefore, the program performs independent communication processing for each node by referring to the control tables 6B and 6C. In addition, NMP (network management program) manages network resources and their failures. In such a configuration, for example,
Data sent from node A to node B is checked by DLClTL and DUC in node B, respectively, and taken into the application level of node B, but data sent from node A to node C is
In node B, the DLC and TL are checked, and when looking at the destination included in the TL header, it is found that it is addressed to node c, so the data is transferred from the DLC to the DLC of node C via the pseudo RISK 5 again. The same applies to data sent from node C to node A. When node C communicates with node A, node C knows from the line definition that it only needs to send data destined for node A to node B, so it sends data to node B. At this time, the program determines whether the real link is a pseudo link, and if it is a pseudo link, the data connected to the transmission queue of node C is transferred to the reception queue of node B, as shown in Figure 7. Reconnect. Node B then operates in response to the DLC in the same manner as it receives data transmitted from node C via the actual link. As a result, when it passes through the DLC to the TL and reads the destination as mentioned above, it is addressed to node A, so the data is relayed and sent from the DLC to node A and to the cusp link 4. Ru. In this way, between the pseudo links 50, specifically, by reconnecting data from the transmission queue to the reception queue, the nodes connected by the real link are Each node can be operated in exactly the same way as the other nodes.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in a test tool system, pseudo nodes can be connected using the concept of pseudo links, so that pseudo nodes can be connected under the same configuration as the actual network configuration. You can conduct integration tests7 with
The ability to create sequences facilitates the creation of test sequences. It is also possible to perform corresponding processing even when an abnormality occurs in the network.

[Brief explanation of drawings]

Figure 1 shows an example of a network system, Figure 2 shows an example of a network system.
The figure shows an overview of the conventional test method, and Figure 3 shows the conventional M
FIG. 4 is a diagram showing an example of the TS system, FIG. 4 is a diagram showing an embodiment of the present invention, FIG. 5 is a diagram showing an example of the configuration of each node to which the present invention is applied, and FIG. 6 is a data/evening format. FIG. 7 is a diagram illustrating data exchange using a pseudo link to which the present invention is applied. 1...Device under test, 2 and 2'...Test tools.
System, 3... DDX (data communication network, packet switching network), 4... Result link, 5... Pseudo link, 6B
and 6C...control table. Patent Applicant Fujitsu Limited (1 other person) Representative Patent Attorney Kyotani Shibeya 1 Figure 3 Figure 4 Figure 2' Figure ■ ■ To [-1

Claims (1)

[Claims] This is a network simulation method for a test tool/system that performs a connection test using the device under test as one of the nodes configuring the network, and the test tool/system is configured to perform a connection test on the device under test as one of the nodes configuring the network. Define a node that has a layer that handles communication rules between lines, transformation rules between each node of the network, data flow, transmission right control, etc. for each node other than the above, and define the attributes of each node corresponding to the node. A control table is provided that defines rules to be handled in each of the above layers, and the control table is configured to enable communication between the above-defined nodes and between each of the above-defined nodes and the above-mentioned device under test. A network simulation method characterized by: