CISCO官方配置手册SPAN.pdf

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1、CHAPTER24ConfiguringSPANandRSPANThischapterdescribeshowtoconfigureSwitchedPortAnalyzer(SPAN)andRemoteSPAN(RSPAN)onyourCatalyst3550switch.NoteForcompletesyntaxandusageinformationforthecommandsusedinthischapter,seethecommandreferenceforthisrelease.Thischapterconsistsofthesesectio

2、ns:•UnderstandingSPANandRSPAN,page24-1•ConfiguringSPAN,page24-8•ConfiguringRSPAN,page24-16•DisplayingSPANandRSPANStatus,page24-24UnderstandingSPANandRSPANYoucananalyzenetworktrafficpassingthroughportsorVLANsbyusingSPANtosendacopyofthetraffictoanotherportontheswitchthathasbeenco

3、nnectedtoaSwitchProbedeviceorotherRemoteMonitoring(RMON)probeorsecuritydevice.SPANmirrorsreceivedorsent(orboth)trafficonasourceportandreceivedtrafficononeormoresourceportsorsourceVLANs,toadestinationportforanalysis.Forexample,inFigure24-1,alltrafficonport4(thesourceport)ismirro

4、redtoport8(thedestinationport).Anetworkanalyzeronport8receivesallnetworktrafficfromport4withoutbeingphysicallyattachedtoport4.Catalyst3550MultilayerSwitchSoftwareConfigurationGuide78-16610-0224-1Chapter24ConfiguringSPANandRSPANUnderstandingSPANandRSPANFigure24-1ExampleSPANConfig

5、urationPort4trafficmirrored12345678...onPort845362718Networkanalyzer111414OnlytrafficthatentersorleavessourceportsortrafficthatenterssourceVLANscanbemonitoredbyusingSPAN;trafficthatgetsroutedtoingresssourceportsorsourceVLANscannotbemonitored.Forexample,ifincomingtrafficisbeingm

6、onitored,trafficthatgetsroutedfromanotherVLANtothesourceVLANisnotmonitored;however,trafficthatisreceivedonthesourceVLANandroutedtoanotherVLANismonitored.RSPANextendsSPANbyenablingremotemonitoringofmultipleswitchesacrossyournetwork.ThetrafficforeachRSPANsessioniscarriedoverauser

7、-specifiedRSPANVLANthatisdedicatedforthatRSPANsessioninallparticipatingswitches.TheSPANtrafficfromthesourcesiscopiedontotheRSPANVLANthroughareflectorportandthenforwardedovertrunkportsthatarecarryingtheRSPANVLANtoanyRSPANdestinationsessionsmonitoringtheRSPANVLAN,asshowninFigure2

8、4-2.Figure24-2ExampleofRSPANConfigurationSourceswitchIn