JPH07297912A - Network performance evaluating device - Google Patents

Abstract

PURPOSE:To predict the change in performance caused by extension or change by providing a network simulator, on-transmission line frame file preparing means, traffic pattern preparing means and traffic generating means. CONSTITUTION:The information of a frame on a transmission line fetched by a frame fetching module 1 is recorded in an on-transmission line frame file 2 together with the time of this fetching. A traffic pattern preparing means 3 writes the maximum value, minimum value, average value and deviation of transmission line use efficiency from the frame fetched into the file 2 into a traffic file 4. A traffic generating means 5 converts the traffic information in the file 4 for a network simulator 6. A user interface 7 accesses the means 3, file 4 and means 5, generates the input valus of a simulator and applies it to the simulator. The interface 7 instructs the means 3 on the frame fetching time of the on-transmission line and the means 3 instructs the module 1 on it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network performance evaluation device for evaluating or predicting the performance of an operating network system.

[0002]

2. Description of the Related Art In recent years, the introduction of network systems has advanced, and various applications are operating via networks. However, since the system becomes large-scaled, complicated, and multi-vendored, the operation of the application may not be as expected or the effect of the system expansion / change may not be confirmed. Therefore, it is necessary to know whether the network system in operation is effectively using resources, and in some cases, it is necessary to reconfigure or expand the network system for effective use. It has become to.

For this purpose, it is first necessary to know the performance of the currently operating network system. As this method, there are a method of conducting a test using an actual system and a method of implementing a management protocol to grasp the situation of the system.

When a test is carried out using an actual system, traffic is tentatively generated for evaluation, and changes in this response time are investigated. When the management protocol is implemented, the agent manages the situation data of the device to be managed, and the management application can collect the data to know the system performance.

[0005]

When performing performance evaluation of a network system in operation, there are the following problems. Network performance evaluation device When performing a test in an actual system, the test is performed during operation, which may affect the devices connected to the network. Further, since the operation of the network system is not always the same, it is necessary to pay attention to the test method as to how to judge the test result.

Further, when implementing the management protocol, it is necessary to collect data from each agent, which causes an increase in traffic.

Therefore, an object of the present invention is to provide a network performance evaluation apparatus capable of predicting the performance evaluation of the network system or the performance change due to the expansion or modification of the system without affecting the network system in the operating network system. The purpose is to provide.

[0008]

In order to achieve the above object, a network performance evaluation apparatus according to the present invention is a network performance evaluation apparatus for evaluating the performance of a network system in operation, which is a predictive event driven network. A simulator, a transmission path frame file creating means for creating a transmission path frame file composed of information of frames on the transmission path captured in a plurality of periods, and frame information of the transmission path frame file corresponding to the plurality of periods Traffic pattern creating means for creating a traffic file composed of a plurality of traffic patterns, and a traffic pattern suitable for the purpose of evaluation is selected from the traffic file, and the predictive event-driven network simulator is selected from the selected traffic patterns. Traffic generation means for creating a simulation traffic generation file that has been processed so that it can be input, and the contents of the traffic file are presented to the device user, and the traffic pattern generation means is instructed to create a traffic file, and the traffic generation is performed. Instructing means to create the simulation traffic generation file, add the test traffic by the device user to the simulation traffic generation file corresponding to the traffic pattern selected to suit the purpose of evaluation, This added simulation traffic generation file is set in the network simulator, and a user interface for instructing execution of the simulation is provided.

Further, the plurality of traffic patterns are
Information about the frame length of the frame captured in the transmission path frame file during each of the plurality of periods, protocol control information, and the maximum value, the minimum value, and the average value of the transmission path utilization rate per unit time. Or deviation information.

Further, the traffic generation means pays attention to a layer which meets the purpose of evaluation among the plurality of layers transmitted during a certain period of the plurality of periods, and does not retransmit the command frame of the focused layer. Is searched out from the traffic file, and the traffic generation file for simulation is created.

Further, the traffic file is characterized in that it has a traffic volume for a set of a source station and a destination station.

Further, the network performance evaluation apparatus implements a network management protocol, and the plurality of traffic patterns have a frame length of a frame captured in the transmission path frame file during each of the plurality of periods. Information, protocol control information,
Information about the maximum, minimum, average, or deviation of the transmission line utilization rate for each unit time, and the data that each management station regularly collects from the agent, even though there is no error in the data itself, is transmitted. And the information of the number of data items discarded without being recorded.

[0013]

The transmission path frame file creating means takes in the information of the frame on the transmission path over a plurality of periods and creates the transmission path frame file. The traffic pattern creating means uses a plurality of traffic patterns corresponding to the plurality of periods from the frame information of the transmission path frame file, for example, frame length information, protocol control information, and transmission path utilization rate for each unit time. A traffic file including a plurality of traffic patterns having maximum value, minimum value, average value or deviation information is created. The traffic generation means selects a traffic pattern suitable for the purpose of evaluation from a traffic file composed of a plurality of traffic patterns, for example, a traffic pattern corresponding to a period of interest among the plurality of periods, and the content of the selected traffic pattern. Is processed so that it can be input to a predictive event-driven network simulator,
Create a traffic generation file for simulation.

The user interface can present the contents of the traffic file to the device user, can instruct the traffic pattern creating means to create the traffic file, and can instruct the traffic generating means of the simulation traffic generation file. Creation can be instructed, and while referring to the traffic generation file for simulation created based on the traffic pattern selected to suit the purpose of evaluation, the device user can perform evaluation such as further increasing the transmission line utilization rate. Various test traffics can be added according to the purpose, the simulation traffic generation file after the addition can be set in the network simulator, and the execution of the simulation is instructed.

According to the present invention, a traffic pattern suitable for the purpose of performance evaluation is selected from traffic files accumulating a plurality of traffic patterns, a traffic generation file for simulation for that period is created, and it is set in the network simulator. So, you can simulate the operation of the network system in operation,
By setting test traffic to the user interface and changing / expanding conditions of network resources, it is possible to evaluate and predict the performance of the network system without affecting the actual system. Moreover, since the traffic of the actual system according to the purpose of evaluation can be selected from a plurality of traffic patterns, performance evaluation / prediction without bias can be performed.

Further, since the traffic file has the traffic volume for the set of the transmission source station and the transmission destination station, it is possible to know the traffic state of each station which cannot be understood only by the traffic pattern showing the transmission line utilization tendency. In the case where a load test is performed on a certain station or when load distribution is considered in system expansion, more detailed performance evaluation or performance prediction can be performed.

Further, the network performance evaluation apparatus implements a network management protocol, and the plurality of traffic patterns include information on the frame length of the frame captured in the transmission path frame file during each of the plurality of periods, and In addition to protocol control information and maximum / minimum value / average value or deviation of transmission line utilization rate per unit time, there is an error in the data itself at each station collected by the management application from the agent. It also has information on the number of data items that were discarded even though they were not transmitted.

As a result, by adding discard data that does not appear on the transmission path and setting it in the network simulator, it is possible to simulate the operation of the operating network system in which a buffer overflow occurs. By adding the discard data information to the traffic generation file for simulation, more accurate evaluation can be performed.
For example, if the set test traffic can be sent when the discard data information is ignored, but may be discarded due to a buffer overflow when the discard data information is taken into consideration and may be discarded. Can be accurately evaluated.

Further, since the data collection by the management application relates only to the discarded data, it is possible to evaluate or predict the performance of the network system without drastically increasing the traffic of the operating system, and to evaluate the actual system according to the purpose of the evaluation. Traffic can be selected from a plurality of traffic patterns, and thus unbiased performance evaluation / prediction is possible.

Further, since the traffic file has the traffic volume for the set of the transmission source station and the transmission destination station, it is possible to know the traffic state of each station which cannot be understood only by the traffic pattern showing the transmission line utilization tendency. , It is possible to perform more detailed performance evaluation or performance prediction without drastically increasing the traffic of the operating network system. In particular, it is effective when performing a load test on a certain station or when considering load distribution when expanding the system.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. A first embodiment of the network performance evaluation apparatus of the present invention will be described. FIG. 1 is an overall schematic configuration diagram of a network performance evaluation apparatus of this embodiment. The frame capturing module 1 for capturing a frame on the transmission path is connected to a transmission path (not shown). The information of the frame on the transmission path captured by the frame capture module 1 is recorded in the transmission path frame file 2 together with the capture time. The traffic pattern creating means 3 transmits the frame length of the frame and the protocol control information from the frame captured in the transmission path frame file 2 captured during a predetermined period, and the transmission per unit time during the predetermined period. The maximum value, the minimum value, the average value, and the deviation of the road utilization rate are written in the traffic file 4 as a traffic pattern.

The traffic generation means 5 calculates the traffic situation of the traffic file 4 by the network simulator 6
Convert for.

The user interface 7 accesses the traffic pattern creating means 3, the traffic file 4, and the traffic generating means 5 to generate an input value to the network simulator 6, and gives it to the network simulator 6. The user interface 7 instructs the traffic pattern creating means 3 about the frame capture period on the transmission path, and the traffic pattern creating means 3 instructs the frame capture module 1 to do so.

FIG. 2 shows an example of the traffic file 4 in this embodiment. The traffic file 4 records frame information of a plurality of periods in order to store various traffic states of the network system.

The pattern block 10 is composed of the number of traffic patterns representing the number of recorded periods and the pattern pointer blocks 11 corresponding to the number of traffic patterns. The pattern pointer block 11 is composed of pointers (time pointer 12, traffic pattern pointer 13, frame file pointer 14) indicating the traffic information of the period.

The time pointer 12 points to a time block 15 representing the sampling time (capture time) of a frame on the transmission path. The time block 15 includes a sampling start date and time and a sampling time.

The traffic pattern pointer 13 points to the traffic pattern block 16 storing the traffic pattern. The traffic pattern block 16 has the number of samples and an element relating to the transmission utilization rate as constituent elements. The number of samples is the number obtained by dividing the sampling time of the time block 15 by the unit time. The elements regarding the transmission utilization rate are the maximum value, the minimum value, the average value, and the deviation of the transmission utilization rate for the number of samples in the unit time interval from the sampling start time.

The frame file pointer 14 points to the frame file 17. The frame file 17 is composed of the total number of frames in this period and a frame block 18 having protocol control information for each frame.

The frame blocks 18 are arranged in order of the time taken by the frame taking module 1, and represent the frame block pointer pointing to the next frame block 18 and the command type of the highest layer in the protocol control information of the frame. A command number, a CR flag indicating whether it is a command or a response, a retransmission flag indicating whether it is a retransmission frame, a response frame pointer pointing to a frame block of a response frame corresponding to this frame, a frame capture module 1
The capture time (sampling time), frame length, protocol control information length, and protocol control information.

FIG. 3 is an example of a command list in this embodiment. The traffic pattern creating means 3 creates the traffic file 4 with reference to the command list 19.

The command list 19 includes, for each layer command, protocol control information indicating the command, corresponding responses, protocol control information indicating a retransmission command, and a management table pointer for detecting a retransmission frame. provide. If no response is returned or no retransmission is performed, the protocol control information is set to 0. A command number is given to each command in the command list. The management table pointer points to retransmission sequence management information, for example, as shown in FIG.
Command number 3 in the transmission sequence state variable V (S
I), an image receiving sequence state variable V (RI) management table.

FIG. 4 and FIG. 5 are flow charts for determining the command number, the CR flag, the retransmission flag, and the response frame pointer in the frame block in this embodiment.

The time and the protocol control information in the frame file 17 are the same as the corresponding portions in the transmission path frame file 2, and the total number of frames, the frame length, and the protocol control information length are the frames of the transmission path frame file 2. It is a value calculated from information.

The determination flow of the other 18 elements of the frame block other than the frame block pointer is as shown in FIGS. The following is performed for all frame blocks in order from the first frame block of the frame file 17 (steps S1 and S2). The command number of that frame block is 0 in the initialization state,
If the frame is a command frame from the command list, the command number in the command list is the command number of the frame block, and the CR flag is C (command). The command number given here is the command number of the highest layer in the protocol control information (steps S3, S4, S5).

Further, it is known from the command list whether the command type has a retransmission sequence (step S
6) If there is a retransmission sequence, in order to know whether or not the frame is a retransmission frame, is there an element that matches the frame information from the management table pointed to by the management table pointer for that command number in the command list? Search (step S7). If it is not a retransmission frame, a retransmission sequence management element of the management table is added, and the retransmission flag of the frame block is set to "not retransmission" (steps S8 and S9). If the command frame does not require a response (step S10), the response frame pointer of the frame block is set to 0 (step S11), and the same process is repeated for the next frame block (step 12).

If the command number is not 0 in step S3, or if the command frame is not the command frame in step S4, the process proceeds to step S12 and the next frame block is processed. If there is no retransmission sequence in step S6, the retransmission flag is set to "unnecessary",
The process proceeds to step S10 to check the response type. If it is determined in step S7 that the frame is a retransmission frame, the retransmission flag is set to "retransmission" (step S14),
It proceeds to step S11.

If the command frame returns a response in step S10, the response frame for this frame is searched. P is the current frame block, P
Let n be the frame block pointed to by the P frame block pointer (step S15), and check whether the Pn protocol control information matches the response type (step S15).
16) If they match, the frame is set as the response frame, and the P response frame pointer is set as the Pn address. Further, the command number of Pn is set to the command number of P, the CR flag of Pn is set to R (response),
The response frame pointer is set to 0 (step S1
7, S18), and proceeds to step S12. Step S16
If Pn is not a frame block representing a P response frame, Pn is set as the frame block pointed to by the Pn frame block pointer, and step S16 and subsequent steps are repeated until Pn becomes the last frame block of the frame file (step If no response frame is found, the response frame pointer of P is set to 0 (step S2).
1), the process proceeds to step S12.

FIG. 6 is a flow chart for creating a simulation traffic generation file in this embodiment.

The traffic generation file for simulation is created by the traffic generation means 5 from the frame file in order to input the traffic state for a predetermined period to the network simulator 6.

Let Tu be the traffic setting unit time, S the simulation traffic generation time initial setting, Ts the sampling initial time, the sum of Te and Ts and the simulation time, and P the first frame block after the time Ts. Ts is the start time of the period to be simulated (step S30). The traffic from Ts to Te is sent to the network simulator 6 by Tu.
Set in units (steps S31, S32, S
33).

When the layer L traffic is input to the network simulator 6, the P command number and CR
It is checked from the flag whether it is a command frame of layer L (step S34). If it is a command frame of layer L, it is checked from the retransmission flag whether it is a retransmission frame (step S35) and the retransmission frame If not, the protocol control information of P is converted into the simulation traffic generation file format and added to the simulation traffic generation file. The generation time of this frame in the simulation is S. (Step S36). That is, Ts and T
In the simulation, the frames on the transmission path between s + Tu are in a state of being generated at a time S. Next, P is set as the next frame block (discard S37), and step S
32 and subsequent steps are repeated.

If the command frame is not a layer L command frame in step S34, or if the resend flag is neither "not resent" nor "unnecessary" in step S35, the process proceeds to step S37.

FIG. 7 is an example of a simulation traffic generation file format table in this embodiment. This table provides the format for the network simulator 6 for command numbers. The response frame length, which is an element of the format, is the frame length of the frame block 18 pointed to by the response frame pointer in the case of a command frame requiring a response, and is 0 otherwise. In step S36 in FIG. 5, the frame number is converted into a format corresponding to the command number.

When the network performance is evaluated, the pattern pointer block 11 having the traffic pattern block 16 which meets the purpose of the performance evaluation is selected from the traffic file accumulating a plurality of track patterns by using the user interface 7, and The pattern pointer block 11, the layer to be simulated, and the test traffic are specified in the user interface 7. The user interface 7 instructs them to the traffic generation means 5, and the traffic generation means 5 creates a simulation traffic generation file for that period.
The user interface 7 gives the file and the network configuration to the network simulator 6 to instruct execution of the simulation.

As described above, according to the configuration of the present embodiment, the traffic pattern that suits the purpose of performance evaluation is selected from the traffic files that store a plurality of traffic patterns,
By creating a traffic generation file for simulation during that period and setting it in the network simulator, it is possible to simulate the operation of the network system in operation. By changing the resource and setting the expansion condition, it is possible to evaluate and predict the performance of the network system without affecting the actual system. Moreover, since the traffic of the actual system according to the purpose of evaluation can be selected from a plurality of traffic patterns, performance evaluation / prediction without bias can be performed.

Next, a second embodiment of the network performance evaluation apparatus of the present invention will be described below. Also in this embodiment,
FIG. 1 shows an overall view of a network performance evaluation device. Figure 8
Is an example of a pattern pointer block of a traffic file in this embodiment.

The pattern pointer block 11 in the traffic file 4 has a station-specific traffic pointer 20 in addition to the time pointer 12, the traffic pattern pointer 13, and the frame file pointer 14.

The traffic pointer for each station 20 points to a station traffic block 21 which represents the traffic volume for a set of a source station and a destination station.
The station traffic block 21 is composed of a source address SA, a destination address DA, and a combination-specific traffic block 22 having the traffic corresponding to this combination during the period as a component, and the combination-specific traffic block number. It

When the network performance is evaluated, the pattern pointer block 11 having the traffic pattern block 16 and the station traffic block 21 which are suitable for the purpose of the performance evaluation is set in the user interface 7 from the traffic file accumulating a plurality of traffic patterns.
To select the pattern pointer block 11, the layer to be simulated, and the test traffic in the user interface 7. The user interface 7 instructs them to the traffic generation means 5, and the traffic generation means 5 creates a simulation traffic generation file for that period. The file and the network configuration are given as values, and the user interface 7 gives them to the network simulator 6 to instruct execution of the simulation.

Since the transmission / reception situation for each station can be known from the station traffic block 21, more detailed traffic setting is performed when a load test is performed on a certain station or when load balancing is considered in system expansion. be able to.

As described above, according to the configuration of the present embodiment, the traffic volume for a set of a traffic pattern, a transmission source, and a transmission destination station that suits the purpose of performance evaluation is calculated as a traffic volume obtained by accumulating a plurality of traffic patterns. By selecting a file from the files, creating a traffic generation file for simulation for that period, and setting it in the network simulator, it is possible to simulate the operation of the network system in operation.Therefore, set the test traffic to the user interface. Alternatively, the network system performance can be evaluated and predicted without affecting the actual system by changing the network resource or setting the expansion condition. Also, since the traffic of the actual system according to the purpose of evaluation can be selected from a plurality of traffic patterns, it is possible to evaluate and predict the performance without bias.

Next, a third embodiment of the network performance evaluation apparatus of the present invention will be described below. FIG. 9 is an overall view of the network performance evaluation apparatus in this embodiment. The user interface 7 instructs the traffic pattern creating means 3 on the frame capture period on the transmission path, and the traffic pattern creating means 3 sends it to the frame capture module 1
Instruct.

Further, the traffic pattern creating means 3 instructs the management application 30 of the period and the data collection period, and the management application 30 is transmitted from the agent periodically at each station although the data itself has no error. Collect the number of data that was discarded without. The traffic pattern creating means 3 captures this number of data in the traffic file 4.

FIG. 10 shows an example of the pattern pointer block of the traffic file in this embodiment.

The pattern pointer block 11 in the traffic file 4 has a layer block pointer 23 as a constituent element in addition to the time pointer 12, the traffic pattern pointer 13, and the frame file pointer 14. The layer block pointer 23 points to the layer block 24, and the layer block 24 indicates the management application 30.
Is composed of a layer pointer pointing to a discard data block 25 storing the number of discard data in each layer collected from the agent. There are as many layer pointers as the number of layers, and the discard data block 25 stores discard data information regarding the layer.

The management data block 25 is for each station having the collection cycle of the management application 30, the number of samples obtained by dividing the collection period by the collection cycle, the number of stations, and the station address and the number of discarded data in each collection cycle at that station. The discard data block 26 is a component. Station-based discard data block 2
There are only 6 stations.

The traffic pattern creating means 3 creates this traffic file 4. Traffic generation means 5
For the period and layer specified by the user interface 7 from the frame file 17 according to the simulation traffic generation file creation flow of FIG.
Create a traffic generation file for simulation,
In addition, discard data block 2 of that layer for that period
The discard data information of No. 5 is converted into the simulation traffic generation format and added to the simulation traffic generation file.

FIG. 11 is a flow chart of the simulation traffic generation file creation for discard data in this embodiment.

To is the sampling start time of the time block 15, Ts is the same sampling initial time as in FIG. 5, and Tp
Is the discard data number collection cycle, S is the same simulation time initialization as in FIG. 5, St is the simulation time, and j is 1 (step S40).

Since the traffic setting to the network simulator 6 is data after Ts in the frame file 17, the corresponding portion (i-th discard data number) in the station-specific discard data block 26 is added to the simulator traffic generation file. (Steps S41, S
42). That is, if the number of i-th discard data of the j-th station-specific discard data block in the discard data block 25 is not 0 (step S43), the data generation information for the discard data is added to the simulation traffic generation file. . In the addition, first, the type of data is randomly selected from the command numbers corresponding to the specified layer, the generation time of the data is randomly selected from the time [S, S + Tp], and the transmission source (SA) is selected.
Is the station address of the discard data block 26 for each station, and the destination (DA) is randomly selected from the stations connected to the system to be evaluated.

When the determined data type is a command for this layer to receive a service data unit from the upper layer, the data length according to the distribution specified by the user interface 7 is obtained.

When the command requires a response, similarly, the data length according to the distribution designated by the user interface 7 is obtained. These pieces of information are added to the simulation traffic generation file created from the frame file 17 in the simulation traffic generation file format of FIG. 7 (steps S44, S45, S46, S47, S48, S49,
S50, S51). The processes from steps S45 to S49 are applied to the portions corresponding to the range of S to S + St among the discard data values of all the station-specific discard data blocks 26 (steps S52, S53, S5).
4, S55). Note that default values are set for other service access points.

When the network performance is evaluated, the pattern pointer block 11 having the traffic pattern block 16 which meets the purpose of the performance evaluation is selected from the traffic file accumulating a plurality of traffic patterns by using the user interface 7, and A pattern pointer block 11, a layer to be simulated, a command for creating discarded data traffic, a data length distribution for each response, and test traffic are specified in the user interface 7. The user interface 7 gives an instruction to the traffic generation means 5, and the traffic generation means 5 creates a traffic generation file for simulation for that period. The user interface 7 gives the file and the network configuration to the network simulator 6 to instruct execution of the simulation.

As described above, according to the configuration of the present embodiment, a traffic pattern suitable for the purpose of performance evaluation is selected from the traffic files accumulating a plurality of traffic patterns, and the simulation traffic generation file for that period is created, By adding discard data that does not appear on the transmission path and setting it in the network simulator, it is possible to simulate the operation of a network system in operation in which a buffer overflow occurs, and more accurate evaluation can be performed. Also, since the data collection by the management application is only for the discarded data, it is possible to evaluate and predict the performance of the network system without drastically increasing the traffic of the operating system. Since it is possible to select from a plurality of traffic patterns, unbiased performance evaluation / prediction is possible.

Next, a fourth embodiment of the network performance evaluation apparatus of the present invention will be described below. Also in this embodiment,
FIG. 8 shows an overall view of the network performance evaluation device. Figure 1
2 is an example of a pattern pointer block of a traffic file in this embodiment.

The pattern pointer block 11 in the traffic file 4 has a station-specific traffic pointer 20 in addition to the time pointer 12, the traffic pattern pointer 13, the layer block pointer 23, and the frame file pointer 14.

The traffic pointer for each station 20 points to a station traffic block 21 that represents the traffic volume for a set of a transmission source station and a transmission destination station.

When evaluating the performance of the network, the pattern pointer block 11 having the traffic pattern block 16 and the station traffic block 21 which meet the purpose of the performance evaluation is set to the user interface 7 from the traffic file accumulating a plurality of traffic patterns.
To specify the pattern pointer block 11 and the layer to be simulated, the command for creating the discarded data traffic, the data length distribution for each response, and the test traffic user interface 7. The user interface 7 instructs them to the traffic generation means 5, and the traffic generation means 5 creates a simulation traffic generation file for that period. The user interface 7 gives the file and the network configuration to the network simulator 6 to instruct execution of the simulation.

Since the transmission / reception situation for each station can be known from the station traffic block 21, more detailed traffic setting is performed when a load test is performed for a certain station or when load distribution is considered for system expansion. be able to.

As described above, according to the configuration of the present embodiment, the traffic volume for the set of the traffic pattern and the source and destination stations is set to the traffic volume obtained by accumulating a plurality of traffic patterns so as to meet the purpose of performance evaluation. Select a file from the files, create a simulation traffic generation file for that period, add discard data that does not appear on the transmission path, and set it in the network simulator to simulate the operation of the operating network system that causes a buffer overflow It is possible to make a more accurate evaluation. Also, since the data collection by the management application is only for the discarded data, it is possible to evaluate and predict the performance of the network system without drastically increasing the traffic of the operating system. Since it is possible to select from a plurality of traffic patterns, unbiased performance evaluation / prediction is possible.

[0071]

As described above, according to the configuration of the present invention, in the operating network system, performance change of the network system due to performance evaluation or system expansion or modification can be performed without affecting the network system. Can be predicted.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram showing an embodiment of a network performance evaluation device according to the present invention.

FIG. 2 is a diagram showing an example of a traffic file of the present invention.

FIG. 3 is a diagram showing an example of a command list of the present invention.

FIG. 4 is a diagram showing a flow of determining a command number, a CR flag, a retransmission flag, and a response frame pointer in a frame block according to the present invention.

FIG. 5 is a view showing a continuation of FIG. 4;

FIG. 6 is a diagram showing a flow of creating a simulation traffic generation file in the present invention.

FIG. 7 is a diagram showing an example of a format table of a traffic generation file for simulation of the present invention.

FIG. 8 is a diagram showing an example of a pattern pointer block of a traffic file of the present invention.

FIG. 9 is another overall schematic configuration diagram of the network performance evaluation apparatus according to the present invention.

FIG. 10 is a diagram showing an example of a pattern pointer block of a traffic file of the present invention.

FIG. 11 is a diagram showing a flow of creating a simulation traffic generation file relating to discard data of the present invention.

FIG. 12 is a diagram showing an example of a pattern pointer block of a traffic file of the present invention.

[Explanation of symbols]

 1 Frame Capture Module 2 Frame File on Transmission Line 3 Traffic Pattern Creating Means 4 Traffic File 5 Traffic Generating Means 6 Network Simulator 7 User Interface

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Claims (5)

[Claims] 1. A network performance evaluation device for evaluating the performance of a network system in operation, comprising a predictive event-driven network simulator, and a transmission path frame file comprising information of frames on the transmission path captured in a plurality of periods. And a transmission path frame file creating means for creating, from the frame information of the transmission path frame file,
A traffic pattern creating means for creating a traffic file consisting of a plurality of traffic patterns corresponding to the plurality of periods, selecting a traffic pattern suitable for the purpose of evaluation from the traffic file, and processing the selected traffic pattern. Traffic generation means for creating a simulation traffic generation file that can be loaded into the predictive event-driven network simulator, and present the contents of the traffic file to the device user,
Instructing the traffic pattern creating means to create a traffic file and instructing the traffic creating means to create the simulation traffic generation file, corresponding to the traffic pattern selected so as to meet the purpose of evaluation. A user interface for adding a test traffic by a device user to the simulation traffic generation file, setting the added simulation traffic generation file in the network simulator, and instructing execution of the simulation. Characteristic network performance evaluation device. 2. The plurality of traffic patterns includes frame length information of frames captured in the transmission path frame file during each of the plurality of periods.
The network performance evaluation device according to claim 1, which has protocol control information and information on a maximum value, a minimum value, an average value, or a deviation of a transmission line utilization rate for each unit time. 3. The traffic generation means pays attention to a layer suitable for an evaluation purpose among a plurality of layers transmitted during a certain period of the plurality of periods, and does not retransmit the command frame of the focused layer. 2. The network performance evaluation device according to claim 1, wherein the network traffic evaluation file is searched for from the traffic file to create the simulation traffic generation file. 4. The network performance evaluation device according to claim 1, wherein the traffic file has a traffic amount for a set of a source station and a destination station. 5. The network performance evaluation device implements a network management protocol, and the plurality of traffic patterns are frame lengths of frames captured in the transmission path frame file during each of the plurality of periods. Information, protocol control information, information on the maximum value, minimum value, average value or deviation of the transmission line utilization rate per unit time, and the data itself at each station collected by the management application from the agent. The network performance evaluation device according to claim 1, further comprising: information on the number of data items that have been discarded without being transmitted despite no error.