JPH06209315A - Network overload test equipment - Google Patents

Abstract

PURPOSE:To provide the overload test equipment which sets a network to the overload state in a required minimum network configuration. CONSTITUTION:A reception part 11 detects and receives the frame from a node 30 on a network 20 and reports this reception to a control part 12. The control part 12 instructs a switch part 13 to be switched to a terminal N. Since it is switched to the terminal N, the frame (a) of the reception part 11 is not only inputted to a delay circuit 14 but also outputted to the network 20. When the frame is inputted to the delay circuit, 14, the control part 13 instructs the switch part 13 to be switched to a terminal D. When it is switched to the terminal D, a frame a' delayed by a prescribed time from the delay circuit 14 is not only inputted to the delay circuit 14 but also outputted to the network 20. Hereafter, the delay frame a' is not only outputted to the network 20 but also inputted to the delay circuit 14 after being delayed by the delay circuit 14 till the reception part 11 detects the next frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network overload test device for putting a network into an overloaded state.

[0002]

2. Description of the Related Art FIG. 3 shows a schematic configuration of a conventional network system. This network system has a configuration in which a node station (for example, a workstation) A having a low processing capacity for its capacity (transmission capacity) is connected to the network 1. In such a configuration, due to the processing capability of the node station A, after the data a1 has been transmitted and a further time T has passed,
If the data a2 is sent, each of the above data is transmitted to the network 1 in the relationship shown in FIG. 4, and in this case, the load of the network 1 does not reach its capacity.

Therefore, in order to test whether or not a node station having a low processing capacity with respect to the capacity of the network can normally operate (process) when the network becomes heavily loaded, as shown in FIG. In addition, it is necessary to prepare a plurality of node stations A, B and C having the same processing capability as that of the node station A shown in FIG. 3 and send data from each node station to the network 1. As a result, the data a, b, and c from each node station are sequentially transmitted to the network 1 as shown in FIG. 6, so that the network 1 is in a high load state.

As a method for easily testing a multi-bus and high traffic, Japanese Patent Publication No. 4-1026.
The one disclosed in Japanese Patent Publication No. 5 is known. In the one disclosed in this publication, the adapter is provided with means for changing the process address of the process ID composed of the node address and the process address for each device of the adapter, and between the pair of such adapters, the device of each device Tests are performed by setting multiple logical buses.

[0005]

As described above, in the above-mentioned prior art, the network could not be overloaded unless a plurality of node stations were prepared.

Further, in the one disclosed in Japanese Patent Publication No. 4-10265, the special adapter as described above is used.
It is necessary to prepare one and set a plurality of logical buses corresponding to each device between these adapters, and the network cannot be easily overloaded.

An object of the present invention is to provide a network overload test device which can put a network into an overloaded state with a minimum required network configuration.

[0008]

According to the present invention, there is provided a network overload test apparatus for putting a network into an overloaded state, wherein a receiving means for receiving data received from the network and input data are delayed for a predetermined time. A delay means for outputting, a first mode for making the data output from the receiving means an input to the delay means and an output to the network, and an input of the data output from the delay means to the delay means And switching means for switching between the second mode for outputting to the network, and the first mode when the receiving means receives the received data, and the output data from the receiving means for the delay means. From the input to the receiving unit until the receiving unit receives the next received data, the switching unit switches to the second mode. And comprising a switching control means for controlling.

[0009]

According to the present invention, when the receiving means detects and receives the received data from the network, the received data is output to the network and input to the delay means, and the receiving means further receives the next received data. Is detected by the delay means until it is detected, then output to the network and input to the delay means.

As a result, one reception data is repeatedly output to the network until the next reception data is received, and the network can be put in a high load state.

[0011]

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

FIG. 1 is a block diagram showing an embodiment of a network overload test apparatus according to the present invention.
In the figure, a network overload test apparatus 10 is connected to a network 20, receives data (frames) output from a node station 30 connected to the network 20, and then sends the data to the network 20. . The capacity of the network 20 is shown in FIG.
3 is similar to the conventional network 1 shown in FIG. 3 and the processing capability of the node station 30 is similar to that of the conventional node station A shown in FIG.

In the network overload test apparatus 10, the receiving section 11 detects and receives the received data from the network 20. The switching control unit 12 controls the switch unit 13 according to the detection result of the reception data by the reception unit 11. The switch unit 13 switches the switch SW to the terminal N or the terminal D under the control of the switching control unit 12.
The delay circuit 14 delays the input data by a predetermined time and outputs it.

In the above-mentioned configuration, a process by which the network overload test apparatus 10 brings the network 10 into an overloaded state will be described.

Here, as an initial state, the switch unit 1
The switch SW of 3 is switched to the terminal N side.

First, when a frame a1 is transmitted from the node station 30, the frame a1 is transmitted to the network 20. When the receiving unit 11 detects the start delimiter of the frame a1 transmitted to the network 20, the receiving unit 11 receives the frame a1 and notifies the switching control unit 12 that the frame has been received.

Then, the switching control section 12 controls the switch section 13 to switch the switch SW to the terminal N.
In this case, since the switch SW is switched to the terminal N in the initial state, the switching operation of the switch SW is not performed, and the frame a received by the receiving unit 11 is not changed.
1 is directly input to the delay circuit 14 via the switch unit 13 and output to the network 20.

When the end delimiter of the frame a1 is detected, the switching control unit 12 switches the switch SW.
Switch section 13 to switch the terminal N to the terminal D.
To control.

Since a frame generally includes information indicating the start of a frame (start delimiter) and information indicating the end of a frame (end delimiter), in this embodiment, After instructing the switch unit 13 to switch the switch SW to the terminal N, the switching control unit 12 monitors an output terminal (not shown) of the switch unit 13, and when detecting information indicating the end of the frame, Considering that the frame is input to the delay circuit 14,
The switch SW is instructed to switch from the terminal N to the terminal D. Of course, when the delay circuit 14 detects the information indicating the start of the frame, the switching control unit 12 is notified that the frame is input, and the switching control unit 12
After instructing the switch unit 13 to switch the switch SW to the terminal N, when the first notification that the frame is input is received, the switch SW is instructed to switch from the terminal N to the terminal D. May be.

By the way, the delay circuit 14 to which the frame a1 is input delays the frame a1 by a predetermined time t or more and outputs it. At this time, since the switch SW has already been switched to the terminal D, the output frame a1
Is output to the network 20 via the switch unit 13 and input to the delay circuit 14. Such processing is repeated until the receiving unit 11 detects the next frame. That is, the plurality of frames a1 delayed by the delay circuit 14 are output to the network 20.

In this embodiment, the predetermined time t
When a predetermined position on the network 20 is used as a reference, is set to the time from the passage of the start delimiter of the frame a1 to the passage of the end delimiter of the frame a1 at that position. Therefore, the predetermined time t
Depends on the transmission rate of the network when the data amount is the same, and depends on the data amount when the network is the same (when the transmission rate is the same).

When the receiving unit 11 detects the next frame a2 from the node station 30, the receiving unit 11 receives the frame a2 and notifies the switching control unit 12 that the frame is received in the same manner as above. To do. Then, the switch unit 13 switches the switch SW to the terminal N under the control of the switching control unit 12. The subsequent processing is the same as the above-mentioned processing.

FIG. 2 shows a load state of the network 20 when the above-mentioned processing is performed. In the figure,
a1 and a2 indicate the frame a1 and the frame a2, respectively, and a1 ′ and a2 ′ respectively indicate the frame a1 ′ and the frame a2 ′ delayed by the delay circuit 14, and t1
Indicates the start of the frame, t2 indicates the end of the frame, t indicates the above predetermined time, and T indicates the transmission cycle time of the data transmitted from the node station 30.

Since a1 and a1 = a1 ', and a1 and T are the same as those shown in FIG. 4, in this embodiment, data output from the same node station having a low processing capacity is used. It is possible to load the network 20 with a data amount three times as large.

As described above, according to this embodiment, the network can be put into a high load state only by connecting the network overload test device of this embodiment to an existing network. This means that the node station to be tested, which is connected to the network, does not need a special device and may be a general-purpose device (for example, a workstation, a computer, a communication device).

[0026]

As described above, according to the present invention, when the receiving means detects and receives the received data from the network, the received data is output to the network and input to the delay means. Further, until the receiving means detects the next received data, it is delayed by the delay means for a predetermined time and then outputted to the network and inputted to the delay means, so that one received data is received by the next received data. It is repeatedly output until it is output to the network, and there is an advantage that the network can be put in a high load state.

Further, there is an advantage that the network can be put into a high load state only by connecting the network overload test device of the present invention to the existing network.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a network overload test device according to the present invention.

FIG. 2 is a diagram showing a state of an overloaded state of a network in this embodiment.

FIG. 3 is a diagram for explaining a conventional network overload process.

FIG. 4 is a diagram for explaining a conventional network overload process.

FIG. 5 is a diagram for explaining a conventional network overload process.

FIG. 6 is a diagram for explaining a conventional network overload process.

[Explanation of symbols]

10 ... Network overload test device, 11 ... Receiver, 1
2 ... Switching control unit, 13 ... Switch unit, 14 ... Delay circuit,
20 ... network, 30 ... node station.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location 7240-5K H04L 13/00 315 Z

Claims (1)

[Claims] 1. A network overload test apparatus for putting a network into an overloaded state, receiving means for receiving data received from the network, delay means for delaying input data by a predetermined time, and outputting the delayed data. A first mode in which data output from the means is input to the delay means and output to the network; and data output from the delay means is input to the delay means and output to the network Switching means for switching between the second mode and the first mode when the receiving means receives the received data.
The switching means to switch to the second mode from the time when the delay means inputs the output data from the receiving means to the time when the receiving means receives the next received data. A network overload test apparatus comprising: a switching control unit for controlling.