RFC2544 测试规范.docx
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RFC2544 测试规范.docx
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RFC2544测试规范
NetworkWorkingGroupS.Bradner
RequestforComments:
2544HarvardUniversity
Obsoletes:
1944J.McQuaid
Category:
InformationalNetScoutSystems
March1999
BenchmarkingMethodologyforNetworkInterconnectDevices
StatusofthisMemo
ThismemoprovidesinformationfortheInternetcommunity.Itdoes
notspecifyanInternetstandardofanykind.Distributionofthis
memoisunlimited.
CopyrightNotice
Copyright(C)TheInternetSociety(1999).AllRightsReserved.
IESGNote
ThisdocumentisarepublicationofRFC1944correctingthevalues
fortheIPaddresseswhichwereassignedtobeusedasthedefault
addressesfornetworkingtestequipment.(SeesectionC.2.2).This
RFCreplacesandobsoletesRFC1944.
Abstract
Thisdocumentdiscussesanddefinesanumberofteststhatmaybe
usedtodescribetheperformancecharacteristicsofanetwork
interconnectingdevice.Inadditiontodefiningtheteststhis
documentalsodescribesspecificformatsforreportingtheresultsof
thetests.AppendixAliststhetestsandconditionsthatwebelieve
shouldbeincludedforspecificcasesandgivesadditional
informationabouttestingpractices.AppendixBisareference
listingofmaximumframeratestobeusedwithspecificframesizes
onvariousmediaandAppendixCgivessomeexamplesofframeformats
tobeusedintesting.
1.Introduction
Vendorsoftenengagein"specsmanship"inanattempttogivetheir
productsabetterpositioninthemarketplace.Thisofteninvolves
"smoke&mirrors"toconfusethepotentialusersoftheproducts.
Bradner&McQuaidInformational[Page1]
RFC2544BenchmarkingMethodologyMarch1999
Thisdocumentdefinesaspecificsetofteststhatvendorscanuseto
measureandreporttheperformancecharacteristicsofnetwork
devices.Theresultsofthesetestswillprovidetheusercomparable
datafromdifferentvendorswithwhichtoevaluatethesedevices.
Apreviousdocument,"BenchmarkingTerminologyforNetwork
InterconnectDevices"(RFC1242),definedmanyofthetermsthatare
usedinthisdocument.Theterminologydocumentshouldbeconsulted
beforeattemptingtomakeuseofthisdocument.
2.Realworld
Inproducingthisdocumenttheauthorsattemptedtokeepinmindthe
requirementthatapparatustoperformthedescribedtestsmust
actuallybebuilt.Wedonotknowof"offtheshelf"equipment
availabletoimplementallofthetestsbutitisouropinionthat
suchequipmentcanbeconstructed.
3.Teststoberun
Thereareanumberoftestsdescribedinthisdocument.Notallof
thetestsapplytoalltypesofdevicesundertest(DUTs).Vendors
shouldperformalloftheteststhatcanbesupportedbyaspecific
typeofproduct.Theauthorsunderstandthatitwilltakea
considerableperiodoftimetoperformalloftherecommendedtests
nderalloftherecommendedconditions.Webelievethattheresults
areworththeeffort.AppendixAlistssomeofthetestsand
conditionsthatwebelieveshouldbeincludedforspecificcases.
4.Evaluatingtheresults
Performingalloftherecommendedtestswillresultinagreatdeal
ofdata.Muchofthisdatawillnotapplytotheevaluationofthe
devicesundereachcircumstance.Forexample,therateatwhicha
routerforwardsIPXframeswillbeoflittleuseinselectinga
routerforanenvironmentthatdoesnot(andwillnot)supportthat
protocol.Evaluatingeventhatdatawhichisrelevanttoa
particularnetworkinstallationwillrequireexperiencewhichmaynot
bereadilyavailable.Furthermore,selectionoftheteststoberun
andevaluationofthetestdatamustbedonewithanunderstandingof
generallyacceptedtestingpracticesregardingrepeatability,
varianceandstatisticalsignificanceofsmallnumbersoftrials.
Bradner&McQuaidInformational[Page2]
RFC2544BenchmarkingMethodologyMarch1999
5.Requirements
Inthisdocument,thewordsthatareusedtodefinethesignificance
ofeachparticularrequirementarecapitalized.Thesewordsare:
*"MUST"Thisword,orthewords"REQUIRED"and"SHALL"meanthat
theitemisanabsoluterequirementofthespecification.
*"SHOULD"Thiswordortheadjective"RECOMMENDED"meansthat
theremayexistvalidreasonsinparticularcircumstancesto
ignorethisitem,butthefullimplicationsshouldbe
understoodandthecasecarefullyweighedbeforechoosinga
differentcourse.
*"MAY"Thiswordortheadjective"OPTIONAL"meansthatthis
itemistrulyoptional.Onevendormaychoosetoincludethe
itembecauseaparticularmarketplacerequiresitorbecauseit
enhancestheproduct,forexample;anothervendormayomitthe
sameitem.
Animplementationisnotcompliantifitfailstosatisfyoneormore
oftheMUSTrequirementsfortheprotocolsitimplements.An
implementationthatsatisfiesalltheMUSTandalltheSHOULD
requirementsforitsprotocolsissaidtobe"unconditionally
compliant";onethatsatisfiesalltheMUSTrequirementsbutnotall
theSHOULDrequirementsforitsprotocolsissaidtobe
"conditionallycompliant".
6.Testsetup
Theidealwaytoimplementthisseriesoftestsistouseatester
withbothtransmittingandreceivingports.Connectionsaremade
fromthesendingportsofthetestertothereceivingportsofthe
DUTandfromthesendingportsoftheDUTbacktothetester.(see
Figure1)Sincethetesterbothsendsthetesttrafficandreceives
itback,afterthetraffichasbeenforwardedbuttheDUT,thetester
caneasilydetermineifallofthetransmittedpacketswerereceived
andverifythatthecorrectpacketswerereceived.Thesame
functionalitycanbeobtainedwithseparatetransmittingand
receivingdevices(seeFigure2)butunlesstheyareremotely
controlledbysomecomputerinawaythatsimulatesthesingle
tester,thelaborrequiredtoaccuratelyperformsomeofthetests
(particularlythethroughputtest)canbeprohibitive.
Bradner&McQuaidInformational[Page3]
RFC2544BenchmarkingMethodologyMarch1999
+------------+
||
+------------|tester|<-------------+
||||
|+------------+|
||
|+------------+|
||||
+----------->|DUT|--------------+
||
+------------+
Figure1
+--------++------------++----------+
||||||
|sender|-------->|DUT|--------->|receiver|
||||||
+--------++------------++----------+
Figure2
6.1Testsetupformultiplemediatypes
TwodifferentsetupscouldbeusedtotestaDUTwhichisusedin
real-worldnetworkstoconnectnetworksofdifferingmediatype,
localEthernettoabackboneFDDIringforexample.Thetestercould
supportbothmediatypesinwhichcasethesetupshowninFigure1
wouldbeused.
TwoidenticalDUTsareusedintheothertestsetup.(seeFigure3)
Inmanycasesthissetupmaymoreaccuratelysimulatethereal
world.Forexample,connectingtwoLANstogetherwithaWANlinkor
highspeedbackbone.Thissetupwouldnotbeasgoodatsimulating
asystemwhereclientsonaEthernetLANwereinteractingwitha
serveronanFDDIbackbone.
+-----------+
||
+---------------------|tester|<---------------------+
||||
|+-----------+|
||
|+----------++----------+|
||||||
+------->|DUT1|-------------->|DUT2|---------+
||||
+----------++----------+
Figure3
Bradner&McQuaidInformational[Page4]
RFC2544BenchmarkingMethodologyMarch1999
7.DUTsetup
Beforestartingtoperformthetests,theDUTtobetestedMUSTbe
configuredfollowingtheinstructionsprovidedtotheuser.
Specifically,itisexpectedthatallofthesupportedprotocolswill
beconfiguredandenabledduringthissetup(SeeAppendixA).Itis
expectedthatallofthetestswillberunwithoutchangingthe
configurationorsetupoftheDUTinanywayotherthanthatrequired
todothespecifictest.Forexample,itisnotacceptabletochange
thesizeofframehandlingbuffersbetweentestsofframehandling
ratesortodisableallbutonetransportprotocolwhentestingthe
throughputofthatprotocol.Itisnecessarytomodifythe
configurationwhenstartingatesttodeterminetheeffectoffilters
onthroughput,buttheonlychangeMUSTbetoenablethespecific
filter.TheDUTsetupSHOULDincludethenormallyrecommended
routingupdateintervalsandkeepalivefrequency.Thespecific
versionofthesoftwareandtheexactDUTconfiguration,including
whatfunctionsaredisabled,usedduringthetestsMUSTbeincluded
aspartofthereportoftheresults.
8.Frameformats
TheformatsofthetestframestouseforTCP/IPoverEthernetare
showninAppendixC:
TestFrameFormats.Theseexactframeformats
SHOULDbeusedinthetestsdescribedinthisdocumentforthis
protocol/mediacombinationandthattheseframeswillbeusedasa
templatefortestingotherprotocol/mediacombinations.Thespecific
formatsthatareusedtodefinethetestframesforaparticulartest
seriesMUSTbeincludedinthereportoftheresults.
9.Framesizes
AllofthedescribedtestsSHOULDbeperformedatanumberofframe
sizes.Specifically,thesizesSHOULDincludethemaximumandminimum
legitimatesizesfortheprotocolundertestonthemediaundertest
andenoughsizesinbetweentobeabletogetafullcharacterization
oftheDUTperformance.Exceptwherenoted,atleastfiveframe
sizesSHOULDbetestedforeachtestcondition.
TheoreticallytheminimumsizeUDPEchorequestframewouldconsist
ofanIPheader(minimumlength20octets),aUDPheader(8octets)
andwhateverMAClevelheaderisrequiredbythemediainuse.The
theoreticalmaximumframesizeisdeterminedbythesizeofthe
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