CN102064982A - Measuring system of mixed frame size forwarding performance of network equipment and test method thereof - Google Patents
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Abstract
The invention discloses a measuring system of the mixed frame size forwarding performance of network equipment and a test method thereof. The measuring system comprises a measuring module, a surface chart drawing module, a storage module, an analysis module, an evaluation module and a display module; based on the definition that the forwarding performance of the network equipment comprises two indexes of throughput and back to back, a mixed frame size scheme is introduced to the test on the forwarding performance of the network equipment; the measuring module realizes measurement on the forwarding performance of the equipment under different frame size distributions through adjusting the proportion of data frames with different frame sizes in a data stream; the surface chart drawing module draws a surface chart according to the measuring result; the analysis module calculates and analyzes the measuring result; the evaluation module calculates the credibility of the measuring result; and the display module displays the analysis on the surface chart and the credibility of the measuring result in an intuitive and visual way. The invention can realize the integration, the automation and the visualization of measurement as well as result analysis and evaluation of the frame size forwarding performance of the network equipment.
Description
Technical field
The invention belongs to network equipment field of measuring technique, be meant that specifically a kind of network equipment mixes the measuring system and the method for testing thereof of frame length forwarding performance.
Background technology
Be accompanied by the continuous expansion of internet scale, the kind of the network equipment that puts into effect and number are also in quick growth, various network equipment organic assembling become whole internet, network equipment forwarding performance directly affects effective performance of overall performance of network, automatically effectively measuring of network equipment packet forwarding performance is to the accurate assessment of the performance of the network equipment self and overall performance of network with improve significant.
The forwarding performance of the network equipment comprises throughput and two indexs back-to-back, and testing throughput stresses to test the transfer capability of forwarding engine, and test stresses the buffer memory ability of test interface back-to-back.Internet standard file RFC1242 (Benchmarking terminology for network interconnection devices), RFC2544 (Benchmarking Methodology for Network Interconnect Devices) have defined this two indexs, and have provided the suggestion of method of testing.The method of testing of advising among the RFC2544 is traditional network equipment forwarding performance testing scheme, comprises the long test back-to-back of long testing throughput of single frames and single frames.In view of the restriction of testing time expense and stores it space expense, generally all adopt a set that comprises some discrete frame lengths to substitute continuous frame length when implementing two testing schemes.Discrete frame length set should possess integrality, comprises minimum frame length, maximum frame length and some medians that network allows, set a: 64B who comprises 7 discrete frame lengths of example such as RFC2544 suggestion, 128B, 256B, 512B, 4B, 1280B, 1518B.
The long testing scheme of traditional single frames can only reflect the forwarding performance of equipment under test under specific frame length, and estimates the forwarding performance of equipment under test at other single frames long data frame places of measuring according to the curve chart that measurement result is drawn.But data flow is not the single frames long pattern in the real network environment, often comprised multiple frame length in the data flow in a period of time, therefore, the long testing scheme of single frames can not reflect the forwarding performance of equipment under test in the real network environment of mixing frame length very accurately.Mix the frame length testing scheme and solved this problem preferably, by suitably choosing, the Frame frame length distribution that the Frame frame length that adopts during test distributes and can approach live network preferably, thus measurement result can reflect the forwarding performance of equipment under test in real network environment more accurately.Mention the long testing scheme of multiframe with mixed frame length testing scheme same concept among the RFC2544, but do not provide display format of concrete test request, implementation method and measurement result etc.In network equipment detection, adopt the research of the rectangular case of hybrid frame fewer at present, but mix the frame length testing scheme accurately measuring, estimate and predicting that the forwarding performance of the network equipment in real network environment plays an important role, on the network equipment, realize the significant of the automation of the mixed measurement of frame length forwarding performance, interpretation of result and assessment, visualization system thereby design an energy.
Summary of the invention
One of purpose of the present invention is to provide a kind of network equipment to mix the measuring system of frame length forwarding performance.
This purpose of the present invention realizes by following technical solution: a kind of network equipment mixes the measuring system of frame length forwarding performance, it is characterized in that: this test macro comprises measurement module, the surface chart drafting module, memory module, analysis module, evaluation module and display module, described measurement module links to each other with memory module with the surface chart drafting module respectively, described measurement module is used for the discrete hybrid frame of selected a plurality of different frame lengths, recently realize the variation that different frame lengths distribute by the shared percentage of overall number of frames of number of frames in whole hybrid frame of adjusting different frame lengths in the hybrid frame, and can network apparatus test forwarding performance under different frame lengths distribute, the output measurement result; Described surface chart drafting module receives the measurement result of measurement module output, and this measurement result is depicted as surface chart; Described memory module is used to store the measurement result of measurement module and the surface chart that the surface chart drafting module is drawn; Described memory module also links to each other with surface chart drafting module, analysis module and evaluation module respectively, described analysis module can call the measurement result that stores in the memory module from memory module, and come the forwarding performance of phase-split network equipment according to this measurement result, then analysis result is flowed to display module and show; Described evaluation module can receive the measurement result of measurement module output, and provides the confidence level evaluation result of measurement result; Described display module links to each other with evaluation module with surface chart drafting module analysis module respectively, described display module is used to provide user interface, and this display module can show surface chart, the analysis result of analysis module and the confidence level evaluation result of evaluation module that the surface chart drafting module is drawn.
(1) measurement module:
Mix the frame length testing scheme, after definite good several discrete frame lengths set, at first therefrom select a set, and realize the variation that frame length distributes by the proportionate relationship that changes number of frames between the different frame lengths.Subsequent step and traditional single frames fourdrinier wire network forwarding performance of equipment testing scheme are similar.
The long testing scheme of traditional single frames is for mixing a special case of frame length testing scheme.Because it is 100% that a certain frame length in discrete frame length set accounts for the proportion of data flow, and other frame length proportions are 0 o'clock, mix the frame length testing scheme and are the long testing scheme of single frames.
The user can select the existing discrete frame length set of system, also can customize discrete frame length set voluntarily, and this function is realized by display module.
(2) surface chart drafting module:
Measurement result is depicted as surface chart on three-dimensional rectangular coordinate, divides three kinds of situations here.
1) frame length is distributed as unimodal value distribution x (X, Y), promptly the Frame of X frame length accounting example in data flow is Y, and other frame length proportions are (1-Y)/(N-1) in the discrete frame length set of using, 0≤Y≤1 wherein, N is the number of element in the discrete frame length set.(X, Y) measurement result under is Z to equipment under test, then can (Z) value is depicted as surface chart on three-dimensional rectangular coordinate for X, Y according to every group at x.
2) frame length is distributed as non-unimodal value distribution I type, the Frame accounting example in data flow that is the X frame length is Y, and other frame length proportions are more or less the same in the discrete frame length set of using, approximate all is (1-Y)/(N-1), then non-unimodal value distribution I is similar to and thinks unimodal value distribution x (X, Y), adopt the drawing practice of Unimodal Distribution measurement result to draw.
3) frame length is distributed as non-unimodal value distribution II type, promptly is different from non-unimodal value distribution I type, i.e. X
1The Frame of frame length accounting example in data flow is Y
1, X
2The Frame accounting example of frame length is Y
2..., X
iThe Frame accounting example of frame length is Y
i, and other frame length proportions are in the discrete frame length set of using
0≤Y wherein
j≤ 1, j=1,2 ... i; I=1,2 ... N, N is the number of element in the discrete frame length set.In order to draw surface chart and to have comparativity, need earlier non-unimodal value distribution to be converted into approximate unimodal value distribution and to map according to measurement result.
(3) analysis module:
(X Y), can observe throughput value or back-to-back value and the variation tendency thereof of equipment under test under different frame lengths distribute intuitively from surface chart, thereby analyze the forwarding performance of equipment under test under different frame lengths distributions to be distributed as unimodal value distribution x for frame length.Because non-unimodal value distribution I/II type can be similar to and think or transform into the distribution of unimodal value, so the analytical method of its measurement result is with the analytical method of unimodal value distribution measuring results.
Display module provides the mode of a kind of system and user interaction, and after the user selected certain partial data and analysis project, analysis module called related data from memory module and calculates and analyze, and the result that will obtain send display module to show.
(4) evaluation module:
Adopt uncertain computational methods to weigh the confidence level of measurement result.The uncertainty component of measurement result comprises two classes: a class is the category-A uncertainty that the method by statistical analysis obtains, as etc. the uncertain component of the discreteness correspondence repeatedly measured under the precision conditions; Another kind of is the category-B uncertainty that obtains by the method that non-statistical is analyzed, the uncertain component of bringing into as the inaccuracy of measuring instrument itself.After calculating A, category-B uncertainty, these component combined standard uncertainties generally also to need be calculated expanded uncertainty according to selected confidence level, in addition so that a credibility interval that comprises most of measurement result is provided.
Display module provides the mode of a kind of system and user interaction, and after the user selected certain partial data and analysis project, evaluation module called related data from memory module and calculates and analyze, and the result that will obtain send display module to show.
(5) display module and memory module:
The function that display module is realized comprises: the function that the user interface of handled easily and technique scheme are mentioned.Memory module stores the surface chart of measurement result and drafting in time, calls or manually calls for display module.
Measuring system of the present invention comprises throughput and back-to-back on the basis of two indexs at the forwarding performance that defines the network equipment, the rectangular case of hybrid frame is incorporated in the forwarding performance test of the network equipment, measurement module is realized the measurement of forwarding performance of equipment under the different frame lengths distributions by Frame proportion in data flow of adjusting different frame lengths, the surface chart drafting module is drawn surface chart according to measurement result, analysis module carries out computational analysis to measurement result, evaluation module calculates the confidence level of measurement result, and display module then shows with the analysis and the confidence level of intuitive visualization mode with surface chart and measurement result.The present invention can realize integrated, the automation, visual of measurement, interpretation of result and the assessment of the network equipment and frame length forwarding performance.
Two of purpose of the present invention is to provide the method for testing of above-mentioned measuring system.
This purpose of the present invention realizes by following technical solution: a kind of network equipment mixes the method for testing of frame length forwarding performance, and this method comprises the steps:
(1) measuring process: by the discrete hybrid frame of the selected a plurality of different frame lengths of measurement module, and the overall number of frames shared percentage of the number of frames of different frame lengths in whole hybrid frame recently realized the variation that different frame lengths distribute in the adjustment hybrid frame, the forwarding performance of network apparatus test under different frame lengths distribute exported measurement result then;
(2) surface chart plot step: receive the measurement result that measurement module is exported by the surface chart drafting module, and this measurement result is depicted as surface chart;
(3) storing step: by the measurement result of storage module stores measurement module and the surface chart of surface chart drafting module drafting;
(4) analytical procedure: from memory module, call the measurement result that stores in the memory module by analysis module, and come the forwarding performance of phase-split network equipment, then analysis result is flowed to display module and show according to this measurement result;
(5) evaluation procedure: receive the measurement result of measurement module output by evaluation module, and provide the confidence level evaluation result of measurement result;
(6) step display as a result: provide user interface by display module, and show surface chart, the analysis result of analysis module and the confidence level evaluation result of evaluation module that the surface chart drafting module is drawn.
Description of drawings
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the frame diagram of measuring system of the present invention.
Embodiment
A kind of network equipment as shown in Figure 1 mixes the measuring system of frame length forwarding performance, this test macro comprises measurement module, the surface chart drafting module, memory module, analysis module, evaluation module and display module, measurement module links to each other with memory module with the surface chart drafting module respectively, measurement module is used for the discrete hybrid frame of selected a plurality of different frame lengths, recently realize the variation that different frame lengths distribute by the shared percentage of overall number of frames of number of frames in whole hybrid frame of adjusting different frame lengths in the hybrid frame, and can network apparatus test forwarding performance under different frame lengths distribute, the output measurement result; The surface chart drafting module receives the measurement result of measurement module output, and this measurement result is depicted as surface chart; Memory module is used to store the measurement result of measurement module and the surface chart that the surface chart drafting module is drawn; Memory module also links to each other with surface chart drafting module, analysis module and evaluation module respectively, analysis module can call the measurement result that stores in the memory module from memory module, and come the forwarding performance of phase-split network equipment according to this measurement result, then analysis result is flowed to display module and show; Evaluation module can receive the measurement result of measurement module output, and provides the confidence level evaluation result of measurement result; Display module links to each other with evaluation module with surface chart drafting module analysis module respectively, display module is used to provide user interface, and this display module can show surface chart, the analysis result of analysis module and the confidence level evaluation result of evaluation module that the surface chart drafting module is drawn.
The user interface that the user provides by display module is provided with the initial parameter of measuring process, measures after setting completed to begin to carry out, measure finish after, measurement result deposits memory module automatically in, calls for subsequent operation.System calls graphics module and draws according to measurement result according to user's setting, calls analysis module measurement result is analyzed, and calls evaluation module measurement result is carried out the confidence level evaluation, and the result of three modules send display module to show.
The implementation procedure of each module and principle are as follows among the present invention:
(1) measurement module:
Mix frame length testing throughput scheme, after definite good several discrete frame lengths set, at first therefrom select a set, and realize the variation that frame length distributes by the proportionate relationship that changes number of frames between the different frame lengths.Each is taken turns in the test and sends test frame with a constant rate of speed to equipment under test, and the frame number of statistics equipment under test forwarding, if the frame number that receives equates with the frame number of transmission, then improve the frame transmission rate of next round test, otherwise reduce the frame transmission rate of next round test.Carry out many wheel tests so repeatedly, be less than or equal to predefined test granularity until up-to-date two-wheeled test errors, can finish to measure when inferior, test result is recently represented with the percentage of fps, pps, bps or linear speed.The every wheel after the test, the algorithm that recomputates the frame transmission rate change amount of next round test is called the throughput searching algorithm, and common method is dichotomy, step-by-step method and both mixed methods.Distribute for every kind of frame length, can carry out word or repeat several times measuring the mixing frame length throughput value of averaging when repeatedly measuring and planting at this frame length branch according to actual conditions as equipment.
Mix frame length testing scheme back-to-back, after the frame length set of determining to disperse, after definite good several discrete frame length set, at first therefrom select a set, and realize the variation that frame length distributes by the proportionate relationship that changes number of frames between the different frame lengths.Use minimum legal frame period to send a string test frame sequence, and write down the tested number of frames of transmitting that is equipped with to equipment under test.If the frame number of transmitting is less than the frame number of transmission, then reduces test time (or length of frame flow string), otherwise increase test time (or length of frame flow string).Repeat above-mentioned test process, up to finding equipment under test the longest treatable frame flow string when not having frame losing, the frame number of this flow string is back-to-back numerical value.Repeat several times according to actual conditions and measure, and the mixing frame length that plants as this frame length branch of averaging is worth back-to-back.
(2) surface chart drafting module:
(X, Y) and non-unimodal value distribution I type, test obtaining some groups of measured value (X to be distributed as unimodal value distribution x for frame length
1, Y
1, Z
11), (X
1, Y
2, Z
12) ..., (X
1, Y
j, Z
1j) ..., (X
i, Y
1, Z
I1) ..., (X
i, Y
j, Z
Ij) ..., Z wherein
IjFor equipment under test at x (X
i, Y
j) under measurement result, then can (Z) value be depicted as surface chart on three-dimensional rectangular coordinate for X, Y according to every group.
Be distributed as non-unimodal value distribution II type for frame length,, need earlier non-unimodal value distribution to be converted into approximate unimodal value distribution and to map according to measurement result in order to draw surface chart and to have comparativity.A kind of feasible specific practice is as follows: each pair set { X
1..., X
iIn selected a kind of frame length X
j, fix other frame length Frame numbers proportion in data flow in this set, only change Y
jThereby, remaining (N-i) individual frame length X in the discrete frame length set
I+1..., X
NThe Frame accounting heavy with Y
jChange, measure.Then with X
jWith X
I+1..., X
NIn a kind of frame length exchange, change new X
jFrame length repeats above-mentioned steps, up to X according to frame number proportion and measuring in data flow
I+1..., X
NAll with X
jExchanged.Because set { X
1..., X
iI element arranged, thus total i the curve chart that unimodal value distributes, thus the analytical method that available unimodal value distributes is analyzed its measurement result.
(3) analysis module:
For throughput value, fixing X, when Y=1, the corresponding Z value is the throughput under the long situation of single frames that equipment is X at frame length; When 0＜Y＜1,, illustrate that then equipment under test handles the ability relatively poor (or overhead is bigger) of the Frame of X frame length if the corresponding Z value is the throughput under the long situation of single frames of X at frame length greater than equipment; Otherwise, illustrate that then equipment under test handles the ability better (or overhead is less) of the Frame of X frame length.For value back-to-back, fixing X, when Y=1, it is that the single frames of X is grown the value back-to-back under the situation at frame length that the corresponding Z value is equipment; When 0＜Y＜1,, illustrate that then equipment under test is relatively poor to the buffer memory ability of the Frame of X frame length if the corresponding Z value is the value back-to-back under the long situation of single frames of X at frame length greater than equipment; Otherwise, illustrate that then equipment under test is better to the buffer memory ability of the Frame of X frame length.Fixing Y, when the corresponding Z value of any two X values differs big, equipment under test has notable difference to the transfer capability of these two kinds of frame length Frames, when the corresponding Z value of any two X values differ than hour, equipment under test is to the transfer capability no significant difference of these two kinds of frame length Frames.
(4) evaluation module:
Calculate the category-A uncertainty
Not under the general situation, supposing that measurement result is finite series { x
n, { x
nElement number be n.At first calculate the mean value of sample
Adopt Bezier (Bessel) formula basis of calculation deviation:
v
1＝n-1。
Calculate the category-B uncertainty
The category-B uncertainty can wait the non-statistical mode to obtain according to inquiry for information about, and this category information comprises data that characteristic, calibration certificate or the specification of measuring instrument instrument provide or the like.Not under the general situation, supposing that the source of category-B uncertainty has t-1, be U
2..., U
t, it is infinitely great that its degree of freedom is commonly considered as, i.e. v
2=∞ ..., v
t=∞.
Basis of calculation uncertainty and expanded uncertainty
Because between each uncertainty component is separate, therefore synthetic standard is uncertain to be:
Calculate effective degree of freedom
Get confidence level P, then check in and comprise factor k by t distribution tables of critical values
P=t
1-P(V
Eff).Calculate expanded uncertainty: U
p=k
p* U
c
In sum, the forwarding performance measurement result of equipment under test under specific frame length distributes is X ± Uc, and confidence level P comprises factor kP.
(5) display module and memory module:
Display module is realized: adopt general graphical interfaces programming technique to realize user interface and the desired function of other modules.Memory module: realize with universal hardware store medium and programming technique thereof.
Claims (2)
1. the network equipment mixes the measuring system of frame length forwarding performance, it is characterized in that: this test macro comprises measurement module, the surface chart drafting module, memory module, analysis module, evaluation module and display module, described measurement module links to each other with memory module with the surface chart drafting module respectively, described measurement module is used for the discrete hybrid frame of selected a plurality of different frame lengths, recently realize the variation that different frame lengths distribute by the shared percentage of overall number of frames of number of frames in whole hybrid frame of adjusting different frame lengths in the hybrid frame, and can network apparatus test forwarding performance under different frame lengths distribute, the output measurement result; Described surface chart drafting module receives the measurement result of measurement module output, and this measurement result is depicted as surface chart; Described memory module is used to store the measurement result of measurement module and the surface chart that the surface chart drafting module is drawn; Described memory module also links to each other with surface chart drafting module, analysis module and evaluation module respectively, described analysis module can call the measurement result that stores in the memory module from memory module, and come the forwarding performance of phase-split network equipment according to this measurement result, then analysis result is flowed to display module and show; Described evaluation module can receive the measurement result of measurement module output, and provides the confidence level evaluation result of measurement result; Described display module links to each other with evaluation module with surface chart drafting module analysis module respectively, described display module is used to provide user interface, and this display module can show surface chart, the analysis result of analysis module and the confidence level evaluation result of evaluation module that the surface chart drafting module is drawn.
2. realize that the described network equipment of claim 1 mixes the method for testing of the measuring system of frame length forwarding performance for one kind, this method comprises the steps:
(1) measuring process: by the discrete hybrid frame of the selected a plurality of different frame lengths of measurement module, and the overall number of frames shared percentage of the number of frames of different frame lengths in whole hybrid frame recently realized the variation that different frame lengths distribute in the adjustment hybrid frame, the forwarding performance of network apparatus test under different frame lengths distribute exported measurement result then;
(2) surface chart plot step: receive the measurement result that measurement module is exported by the surface chart drafting module, and this measurement result is depicted as surface chart;
(3) storing step: by the measurement result of storage module stores measurement module and the surface chart of surface chart drafting module drafting;
(4) analytical procedure: from memory module, call the measurement result that stores in the memory module by analysis module, and come the forwarding performance of phase-split network equipment, then analysis result is flowed to display module and show according to this measurement result;
(5) evaluation procedure: receive the measurement result of measurement module output by evaluation module, and provide the confidence level evaluation result of measurement result;
(6) step display as a result: provide user interface by display module, and show surface chart, the analysis result of analysis module and the confidence level evaluation result of evaluation module that the surface chart drafting module is drawn.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070025261A1 (en) * | 2001-10-01 | 2007-02-01 | Errol Ginsberg | Generating Traffic For Testing A System Under Test |
| CN1917452A (en) * | 2005-08-19 | 2007-02-21 | 上海亿人通信终端有限公司 | Method for testing forwarding performance of Ethernet exchange, and method for configuring network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070025261A1 (en) * | 2001-10-01 | 2007-02-01 | Errol Ginsberg | Generating Traffic For Testing A System Under Test |
| CN1917452A (en) * | 2005-08-19 | 2007-02-21 | 上海亿人通信终端有限公司 | Method for testing forwarding performance of Ethernet exchange, and method for configuring network |
Non-Patent Citations (1)
| Title |
|---|
| 《Agilent Technologies》 20070930 Agilent Technologies INC. The Journal of Internet Test Methodologies 第1-1至1-11页，第16-11至17-17页 1-2 , * |
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