PPPOA基于PVC配置

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1、PPPoA/PPPoEAutosenseforATMPVCsFeatureHistoryReleaseModification12.1(1)DCThisfeaturewasintroducedontheCisco6400UAC.12.2(4)TSupportforthisfeaturewasaddedtotheCisco3660routerandtheCisco7200series.12.2(4)T3SupportfortheCisco7500seriesrouterswasadded.Thisfeaturemod

2、uledescribesthePPPoA/PPPoEAutosenseforATMPVCsfeature.Itincludesthefollowingsections:•FeatureOverview,page1•SupportedPlatforms,page2•SupportedStandards,MIBs,andRFCs,page3•ConfigurationTasks,page3•MonitoringandMaintainingPPPoA/PPPoEAutosenseforATMPVCs,page6•Conf

3、igurationExamples,page6•CommandReference,page10•Glossary,page22FeatureOverviewThePPPoA/PPPoEAutosenseforATMPVCsfeatureenablesaroutertodistinguishbetweenincomingPPPoverATM(PPPoA)andPPPoverEthernet(PPPoE)overATMsessionsandtocreatevirtualaccessbasedondemandforbot

4、hPPPtypes.NoteThePPPoA/PPPoEAutosenseforATMPVCsfeatureissupportedonSNAP-encapsulatedATMPVCsonly.ItisnotsupportedonMUX-encapsulatedPVCs.CiscoIOSRelease12.2(4)T31PPPoA/PPPoEAutosenseforATMPVCsSupportedPlatformsThisnewfeaturealsoaddssupportforprecloningofvirtual-

5、accessinterfacesforPPPoA.Precloningenablesvirtual-accessinterfacestobeallocatedatsystemstart.Thisfunctionalitysignificantlyreducestheloadonthesystemduringcallsetup.Whenprecloningisused,thevirtual-accessinterfaceisattachedtothesessionuponreceiptofthefirstsessio

6、n-initiationpacketfromtheclient.Thevirtual-accessinterfaceisdetacheduponterminationofthePPPsession.BenefitsThePPPoA/PPPoEAutosenseforATMPVCsfeatureprovidesresourceallocationondemand.Foreachpermanentvirtualcircuit(PVC)configuredforbothPPPoAandPPPoE,certainresou

7、rces(includingonevirtual-accessinterface)areallocateduponconfiguration,regardlessoftheexistenceofaPPPoAorPPPoEsessiononthatPVC.WiththePPPoA/PPPoEAutosenseforATMPVCsfeature,resourcesareallocatedforPPPoAandPPPoEsessionsonlywhenaclientinitiatesasession,thusreduci

8、ngoverheadonthenetworkaccessserver(NAS).Restrictions•ThePPPoA/PPPoEAutosenseforATMPVCsfeaturesupportsonlyPPPoAsessionsthatuseSNAPencapsulation.ItdoesnotsupportMUX-encapsulatedPVCs.