园区网高可用HSRP,VRRP培训.ppt

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1、ImplementingHighAvailabilityinaCampusEnvironmentConfiguringLayer3RedundancywithHSRPRoutingIssues:UsingDefaultGatewaysRoutingIssues:UsingProxyARPRouterRedundancyRouterRedundancy(Cont.)HSRPStandbygroup:ThesetofroutersparticipatinginHSRPthatjointlyemulateavirtualrouterTheactiver

2、outerrespondstoARPrequestswiththeMACaddressofthevirtualrouter.TheActiveRouterTheVirtualRouterMACAddressTheStandbyRouterThestandbyrouterlistensforperiodichellomessageson224.0.0.2.ActiveandStandbyRouterInteractionHSRPStatesAnHSRProutercanbeinoneofsixdifferentstates:InitialLearn

3、ListenSpeakStandbyActiveHSRPStateTransitionInitialInitialListenListenActiveSpeakStandbyListenSpeakSpeakStandbyRouterAPriority100RouterBPriority50HSRPStandbyGroup1RouterBhearsthatrouterAhasahigherpriority,sorouterBreturnstothelistenstate.RouterAdoesnothearanyhigherprioritythan

4、itself,sopromotesitselftostandby.RouterAdoesnothearanactiverouter,sopromotesitselftoactive.Arouterinthestandbystate:IsacandidateforactiverouterSendshellomessagesKnowsthevirtualrouterIPaddressHSRPStandbyStateArouterintheactivestate:Assumestheactiveforwardingofpacketsforthevirt

5、ualrouterSendshellomessagesKnowsthevirtualrouterIPaddressHSRPActiveStateHSRPConfigurationCommandsConfigurestandby1ip10.1.1.1Verifyshowrunning-configshowstandbyEnablingHSRPonaCiscorouterinterfaceautomaticallydisablesICMPredirects.ConfiguringanHSRPStandbyInterfaceDisplayingtheS

6、tandbyBriefStatusSwitch#showstandbybriefPindicatesconfiguredtopreempt.

7、InterfaceGrpPrioPStateActiveaddrStandbyaddrGroupaddrVl1111110Activelocal172.16.11.114172.16.11.115SummaryRouterredundancyallowstwoormorerouterstoworkasagrouptomaintainforwardingofIPpackets.Asingledefaultga

8、tewayorproxyARPdoesnotprovidetheredundancyrequiredinacampusnetwork.HSRPprovidesrouterredundancytoenddevices.HSRPoperatestoprovidenonstoppathredundancyforIP.AnHSRP-enabledrouterwillexistinaspecificstateortransitionthroughaseriesofstates.HSRPisconfiguredusingthestandbycommand.H

9、SRPisenabledperinterface.ImplementingHighAvailabilityinaCampusEnviro