RFC2285局域网交换设备基准测试术语.docx

RFC2285局域网交换设备基准测试术语.docx

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RFC2285局域网交换设备基准测试术语

项目编号ITTEL_R&T_2003_004

国信网安测评技术体系

之测试方法篇

（测试文档）

RFC2285BenchmarkingTerminologyforLANSwitchingDevices，1998.2

北京国信网安信息系统测评技术实验室

BenchmarkingTerminologyforLANSwitchingDevicesRFC2285，1998.2

NetworkWorkingGroupR.Mandeville

RequestforComments:

2285EuropeanNetworkLaboratories

Category:

InformationalFebruary1998

StatusofthisMemo

ThismemoprovidesinformationfortheInternetcommunity.ItdoesnotspecifyanInternetstandardofanykind.Distributionofthismemoisunlimited.

CopyrightNotice

Copyright（C）TheInternetSociety（1998）.AllRightsReserved.

tableofContents

1Introduction

Thisdocumentisintendedtoprovideterminologyforthebenchmarkingoflocalareanetwork（LAN）switchingdevices.ItextendstheterminologyalreadydefinedforbenchmarkingnetworkinterconnectdevicesinRFCs1242and1944toswitchingdevices.

Althoughitmightbefoundusefultoapplysomeofthetermsdefinedheretoabroaderrangeofnetworkinterconnectdevices,thisRFCprimarilydealswithdeviceswhichswitchframesattheMediumAccessControl（MAC）layer.Itdefinestermsinrelationtothetrafficputtousewhenbenchmarkingswitchingdevices,forwardingperformance,congestioncontrol,latency,addresshandlingandfiltering.

2Existingdefinitions

RFC1242"BenchmarkingTerminologyforNetworkInterconnectDevices"shouldbeconsultedbeforeattemptingtomakeuseofthisdocument.RFC1944"BenchmarkingMethodologyforNetworkInterconnectDevices"containsdiscussionsofanumberoftermsrelevanttothebenchmarkingofswitchingdevicesandshouldalsobeconsulted.

ForthesakeofclarityandcontinuitythisRFCadoptsthetemplatefordefinitionssetoutinSection2ofRFC1242.Definitionsareindexedandgroupedtogetherinsectionsforeaseofreference.

Thekeywords"MUST","MUSTNOT","REQUIRED","SHALL","SHALLNOT","SHOULD","SHOULDNOT","RECOMMENDED","MAY",and"OPTIONAL"inthisocumentaretobeinterpretedasdescribedinRFC2119.

3Termdefinitions

3.1Devices

Thisgroupofdefinitionsappliestoalltypesofnetworkingdevices.

3.1.1Deviceundertest（DUT）

Definition:

Thenetworkforwardingdevicetowhichstimulusisofferedandresponsemeasured.

Discussion:

Asinglestand-aloneormodularunitwhichreceivesframesononeormoreofitsinterfacesandthenforwardsthemtooneormoreinterfacesaccordingtotheaddressinginformationcontainedintheframe.

Measurementunits:

n/a

Issues:

SeeAlso:

systemundertest（SUT）（

3.1.2SystemUnderTest（SUT）

Definition:

Thecollectivesetofnetworkdevicestowhichstimulusisofferedasasingleentityandresponsemeasured.

Discussion:

Asystemundertestmaybecomprisedofavarietyofnetworkingdevices.Somedevicesmaybeactiveintheforwardingdecision-makingprocess,suchasroutersorswitches;otherdevicesmaybepassivesuchasaCSU/DSU.Regardlessofconstituentcomponents,thesystemistreatedasasingularentitytowhichstimulusisofferedandresponsemeasured.

Measurementunits:

n/a

Issues:

SeeAlso:

deviceundertest（DUT）（

3.2Trafficorientation

ThisgroupofdefinitionsappliestothetrafficpresentedtotheinterfacesofaDUT/SUTandindicateswhethertheinterfacesarereceivingonly,transmittingonly,orbothreceivingandtransmitting.

3.2.1Unidirectionaltraffic

Definition:

WhenallframespresentedtotheinputinterfacesofaDUT/SUTareaddressedtooutputinterfaceswhichdonotthemselvesreceiveanyframes.

Discussion:

Thisdefinitionconformstothediscussioninsection16ofRFC1944whichdescribeshowunidirectionaltrafficcanbeofferedtoaDUT/SUTtomeasurethroughput.Unidirectionaltrafficisalsoappropriatefor:

-themeasurementoftheminimuminter-framegap-thecreationofmany-to-oneorone-to-manyinterfaceoverload-thedetectionofheadoflineblocking-themeasurementofforwardingratesandthroughputwhencongestioncontrolmechanismsareactive.

WhenatesteroffersunidirectionaltraffictoaDUT/SUTreceptionandtransmissionarehandledbydifferentinterfacesorsetsofinterfacesoftheDUT/SUT.AllframesreceivedfromthetesterbytheDUT/SUTaretransmittedbacktothetesterfrominterfaceswhichdonotthemselvesreceiveanyframes.

Itisusefultodistinguishtrafficorientationandtrafficdistributionwhenconsideringtrafficpatternsusedindevicetesting.Unidirectionaltraffic,forexample,istrafficorientatedinasingledirectionbetweenmutuallyexclusivesetsofsourceanddestinationinterfacesofaDUT/SUT.Suchtraffic,however,canbedistributedbetweeninterfacesindifferentways.

WhentrafficissenttotwoormoreinterfacesfromanexternalsourceandthenforwardedbytheDUT/SUTtoasingleoutputinterfacethetrafficorientationisunidirectionalandthetrafficdistributionbetweeninterfacesismany-to-one.TrafficcanalsobesenttoasingleinputinterfaceandforwardedbytheDUT/SUTtotwoormoreoutputinterfacestoachieveaone-to-manydistributionoftraffic.

Suchtrafficdistributionscanalsobecombinedtotestforheadoflineblockingortomeasureforwardingratesandthroughput

whencongestioncontrolmechanismsareactive.WhenaDUT/SUTisequippedwithinterfacesrunningatdifferentmediaratesthenumberofinputinterfacesrequiredtoloadoroverloadanoutputinterfaceorinterfaceswillvary.

Itshouldbenotedthatmeasurementoftheminimuminter-framegapservestodetectviolationsoftheIEEE802.3standard.

Issues:

halfduplex/fullduplex

Measurementunits:

n/a

SeeAlso:

bidirectionaltraffic（

non-meshedtraffic（

partiallymeshedtraffic（

fullymeshedtraffic（

congestioncontrol（3.7）

headoflineblocking（

3.2.2Bidirectionaltraffic

Definition:

FramespresentedtoaDUT/SUTsuchthateveryreceivinginterfacealsotransmits.

Discussion:

Thisdefinitionconformstothediscussioninsection14ofRFC1944.

WhenatesteroffersbidirectionaltraffictoaDUT/SUTalltheinterfaceswhichreceiveframesfromthetesteralsotransmitframesbacktothetester.

BidirectionaltrafficMUSTbeofferedwhenmeasuringthethroughputorforwardingrateoffullduplexinterfacesofaswitchingdevice.

Issues:

truncatedbinaryexponentialback-offalgorithm

Measurementunits:

n/a

SeeAlso:

unidirectionaltraffic（

non-meshedtraffic（

partiallymeshedtraffic（

fullymeshedtraffic（

3.3Trafficdistribution

ThisgroupofdefinitionsappliestothedistributionofframesforwardedbyaDUT/SUT.

3.3.1Non-meshedtraffic

Definition:

FramesofferedtoasingleinputinterfaceandaddressedtoasingleoutputinterfaceofaDUT/SUTwhereinputandoutputinterfacesaregroupedinmutuallyexclusivepairs.

Discussion:

Inthesimplestinstanceofnon-meshedtrafficallframesareofferedtoasingleinputinterfaceandaddressedtoasingleoutputinterface.Theone-to-onemappingofinputtooutputinterfacesrequiredbynon-meshedtrafficcanbeextendedtomultiplemutuallyexclusivepairsofinputandoutputinterfaces.

Measurementunits:

n/a

Issues:

halfduplex/fullduplex

SeeAlso:

unidirectionaltraffic（

bidirectionaltraffic（

partiallymeshedtraffic（

fullymeshedtraffic（

burst（

3.3.2Partiallymeshedtraffic

Definition:

FramesofferedtooneormoreinputinterfacesofaDUT/SUTandaddressedtooneormoreoutputinterfaceswhereinputandoutputinterfacesaremutuallyexclusiveandmappedone-to-many,many-to-oneormany-to-many.

Discussion:

Thisdefinitionfollowsfromthediscussioninsection16ofRFC1944onmulti-porttesting.Partiallymeshedtrafficallowsforone-to-many,many-to-oneormany-to-manymappingsofinputtooutputinterfacesandreadilyextendstoconfigurationswithmultipleswitchingdeviceslinkedtogetheroverbackboneconnections.

Itshouldbenotedthatpartiallymeshedtrafficcanloadbackboneconnectionslinkingtogethertwoswitchingdevicesorsystemsmorethanfullymeshedtraffic.Whenofferedpartiallymeshedtrafficdevicesorsystemscanbesetuptoforwardalloftheframestheyreceivetotheoppositesideofthebackboneconnectionwhereasfullymeshedtrafficrequiresatleastsomeoftheofferedframestobeforwardedlocally,thatistotheinterfacesoftheDUT/SUTreceivingthem.Suchframeswillnottraversethebackboneconnection.

Measurementunits:

n/a

Issues:

halfduplex/fullduplex

SeeAlso:

unidirectionaltraffic（

bidirectionaltraffic（

non-meshedtraffic（

fullymeshedtraffic（

burst（

3.3.3Fullymeshedtraffic

Definition:

FramesofferedtoadesignatednumberofinterfacesofaDUT/SUTsuchthateachoneoftheinterfacesundertestreceivesframesaddressedtoalloftheotherinterfacesundertest.

Discussion:

Aswithbidirectionalpartiallymeshedtraffic,fullymeshedtrafficrequireseachonetheinterfacesofaDUT/SUTtobothreceiveandtransmitframes.Butsincetheinterfacesarenotdividedintogroupsaswithpartiallymeshedtrafficeveryinterfaceforwardsframestoandreceivesframesfromeveryothernterface.Thetotalnumberofindividualinput/outputinterfacepairswhentrafficisfullymeshedovernswitchedinterfacesequalsnx（n-1）.Thiscompareswithnx（n/2）suchinterfacepairswhentrafficispartiallymeshed.

Fullymeshedtrafficonhalfduplexinterfacesisinherentlyburstysinceinterfacesmustinterrupttransmissionwhenevertheyreceiveframes.ThiskindofburstymeshedtrafficischaracteristicofrealnetworktrafficandcanbeadvantageouslyusedtodiagnoseaDUT/SUTbyexercisingmanyofitscomponentartssimultaneously.AdditionalinspectionmaybewarrantedtocorrelatetheframeforwardingcapacityofaDUT/SUTwhenofferedmeshedt