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1、ApproximateCachesforPacketClassificationFrancisChang,Wu-changFengKangLiSystemsSoftwareLaboratoryDepartmentofComputerScienceOGISchoolofScienceandEngineeringatOHSUUniversityofGeorgiaBeaverton,Oregon,USAAthens,Georgia,USA{francis,wuchang}@cse.ogi.edukangli@acm
2、.orgAbstract—Manynetworkdevicessuchasroutersandclassificationcachesrequirethestorageoffullpacketheaders.firewallsemploycachestotakeadvantageoftemporallocalityofUnfortunately,duetotheincreasingsizeofpacketheaderspacketheadersinordertospeeduppacketprocessingd
3、ecisions.(theeventualdeploymentofIPv6[19]),storingfullheaderTraditionally,cachedesignstradeofftimeandspacewiththeinformationcanbeprohibitivegiventhecostofthehigh-goalofbalancingtheoverallcostandperformanceofthedevice.speedmemorythatwouldbeusedimplementsucha
4、cache.Inthispaper,weexamineanotheraxisofthedesignspacethatToaddressthisproblem,thispaperexaminesathirdaxisforhasnotbeenpreviouslyconsidered:accuracy.Inparticular,wedesigningpacketclassificationcaches:accuracy.Inquantifythebenefitsofrelaxingtheaccuracyofthec
5、acheontheparticular,weseektoanswerthefollowingquestion:costandperformanceofpacketclassificationcaches.OurcacheWhatarethequantifiablebenefitsthatrelaxingthedesignisbasedonthepopularBloomfilterdatastructure.Thisaccuracyofacachehasonthesizeandperformanceofpack
6、etpaperprovidesamodelforoptimizingBloomfiltersforthisclassificationcaches?purpose,aswellasextensionstothedatastructuretosupportgracefulaging,boundedmisclassificationrates,andmultipleWhiletherearemanywaysofexploringthisaxis,thisbinarypredicates.Giventhis,wes
7、howthatsuchcachescanpaperexaminesoneapproachfordoingsothroughtheuseofaprovidenearlyanorderofmagnitudecostsavingsattheexpensemodifiedBloomFilter.Inthisapproach,classifiedpacketsofmisclassifyingonebillionthofpacketsforIPv6-basedcaches.satisfyingabinarypredica
8、teareinsertedintothefilterthatcachesthedecision.SubsequentpacketsthenquerythefilterKeywords—Bloomfilter;packetclassification;caches;toquicklytestmembershipbeforebeingprocessedfurther.probabilisticalgor
