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Руководство пользователя. Версия 2.0 Страница: 336

D-Link DWS-4026 [336/741] Configuring differentiated services

ConfiguringDifferentiatedServices

D-Link UnifiedWiredandWirelessAccessSystem

November2011 Page336

D‐LinkUWSUserManual

ConfiguringDifferentiatedServices

TheQoSfeaturecontainsDifferentiatedServices(DiffServ)supportthatallowstraffictobeclassifiedinto

streamsandgivencertainQoStreatmentinaccordancewithdefinedper‐hopbehaviors.

StandardIP‐basednetworksaredesignedtoprovide“besteffort”datadeliveryservice.“Besteffort”service

impliesthatthenetworkdeliversthedatainati

melyfashion,althoughthereisnoguaranteethatitwill.During

timesofcongestion,packetsmaybedelayed,sentsporadically,ordropped.FortypicalInternetapplications,

suchase‐mailandfiletransfer,aslightdegradationinserviceisacceptableandinmanycasesunnoticeable.

Conversely,an ydegradationofse

rvicehasundesirableeff ectsonapplicationswithstricttimingrequirements,

suchasvoiceormultimedia.

TouseDiffServforQoS,thewebpagesaccessiblefromtheDifferentiatedServicesmenumustfirstbeusedto

definethefollowingcategoriesandtheircriteria:

1. Class:Createclassesanddefineclasscriteria.

2. Policy:Createpolicies,as

sociateclasseswithpolicies,anddefinepolicystatements.

3. Service:Addapolicytoaninboundinterface

Packetsareclassifiedandprocessedbase dondefinedcriteria.Theclassificationcriteriaisdefinedbyaclass.

Theprocessingisdefinedbyapolicy'sattributes.Policyattributesmaybedefinedonaper‐classinstancebasis,

anditisth

eseattributesthatareappliedwhenamatchoccurs.Apolicycancontainmultiplesclasses.When

thepolicyisactive,theactionstakendependonwhichclassmatchesthepacket.

Packetprocessingbeginsbytestingtheclassmatchcriteriaforapack et.Apolicyisappliedtoapa

cketwhena

classmatchwithinthatpolicyisfound.

TheDifferentiatedServicesmenupagecontainslinkstothevariousDiffservconfigurationanddisplayfeatures.

DiffservConfiguration

Packetsarefilteredandprocessedbasedondefinedcriteria.Thefilteringcriteriaisdefinedbyaclass.The

processingisdefinedbyapolicy’sattributes.Policyattributesmaybedefinedonaper‐classinstancebasis,and

itistheseattributesthatareappliedwhenamatchoccurs.

Theconfigurationprocessbeginswithdefiningoneormor

ematchcriteriaforaclass.Thenoneormoreclasses

areaddedtoapolicy.Policiesarethenaddedtointerfaces.

Packetprocessingbeginsbytestingthematchcriteriaforapacket.The‘all’classtypeoptiondefinesthateach

matchcriteriawithinaclassmustev

aluatetotrueforapackettomatchthatclass.The‘any’classtypeoption

definesthatatleastonematchcriteriamustevaluatetotrueforapackettomatchthatclass.Classesaretested

intheorderinwhichtheywereaddedtothepolicy.Apolicyisapplie

dtoapacketwhenaclassmatchwithin

thatpolicyisfound.

UsetheDiffservConfigurationpagetodisplayDiffServGeneralStatusGroupinformation,whichincludesthe

currentadministrativemodesettingaswellasthecurrentandmaximumnumberofrowsineachofthemain

DiffServprivateMIBtables.

D-Link DWS-4026 [336/741] Configuring differentiated services

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