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1、?2002,CiscoSystems,Inc.Allrightsreserved.ConfiguringCatalystSwitchOperationsModule3ObjectivesUponcompletingthismodule,youwillbeableto:ExplainhowbridgingandswitchingoperatesExplainthepurposeandoperationsoftheSpanning-TreeProtocolVerifythedefaultconfigurati
2、onofthedevice,givenafunctioningaccesslayerswitchBuildafunctionalaccessswitchconfigurationtosupportthespecifiednetworkoperationalparameters,givenanetworkdesignExecuteanadd,move,orchangeonanaccesslayerswitch,givenanewnetworkrequirement?2002,CiscoSystems,Inc
3、.Allrightsreserved.4BasicLayer2SwitchingandBridgingFunctionsObjectivesUponcompletingthislesson,youwillbeableto:DescribeLayer2switchingandbridgingoperationsandmodesDescribehowLANswitchesuseandpopulatetheMACaddresstableAddresslearningForward/filterdecisionL
4、oopavoidanceEthernetSwitchesandBridgesCut-ThroughSwitchchecksdestinationaddressandimmediatelybeginsforwardingframe.Fragment-FreeSwitchchecksthefirst64bytes,thenimmediately beginsforwardingframe.StoreandForwardCompleteframeisreceivedandcheckedbeforeforward
5、ing.TransmittingFramesMACAddressTableInitialMACaddresstableisempty.LearningAddressesStationAsendsaframetostationC.SwitchcachestheMACaddressofstationAtoportE0bylearningthesourceaddressofdataframes.TheframefromstationAtostationCisfloodedouttoallportsexceptp
6、ortE0(unknownunicastsareflooded).LearningAddresses(Cont.)StationDsendsaframetostationC.SwitchcachestheMACaddressofstationDtoportE3bylearningthesourceaddressofdataframes.TheframefromstationDtostationCisfloodedouttoallportsexceptportE3(unknownunicastsareflo
7、oded).FilteringFramesStationAsendsaframetostationC.Destinationisknown;frameisnotflooded.FilteringFrames(Cont.)StationAsendsaframetostationB.TheswitchhastheaddressforstationBintheMACaddresstable.StationDsendsabroadcastormulticastframe.Broadcastandmulticast
8、framesarefloodedtoallportsotherthantheoriginatingport.BroadcastandMulticastFramesSummaryEthernetswitchesandbridgesincreasetheavailablebandwidthofanetworkbycreatingdedicatednetworksegmentsandinterconnectingthesegment
