CCNA官方Cisco-原本英文资料-PPT-(11).ppt

CCNA官方Cisco-原本英文资料-PPT-(11).ppt

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?2002,CiscoSystems,Inc.Allrightsreserved.

?2002,CiscoSystems,Inc.Allrightsreserved.2RedundantTopologyOverview

ObjectivesUponcompletingthislesson,youwillbeableto:DescribethefeaturesofredundantswitchandbridgetopologiesExplaintheproblemsassociatedwithbroadcaststorms,multipleframetransmissions,andMACaddresstableinstabilityDescribeloopavoidanceandexplainhowitcansolveredundantswitchtopologyissues

Redundanttopologyeliminatessinglepointsoffailure.Redundanttopologycausesbroadcaststorms,multipleframecopies,andMACaddresstableinstabilityproblems.RedundantTopology

HostXsendsabroadcast.Switchescontinuetopropagatebroadcasttrafficoverandover.BroadcastStorms

HostXsendsaunicastframetorouterY.MACaddressofrouterYhasnotbeenlearnedbyeitherswitchyet.RouterYwillreceivetwocopiesofthesameframe.MultipleFrameCopies

HostXsendsaunicastframetorouterY.MACaddressofrouterYhasnotbeenlearnedbyeitherswitch.SwitchesAandBlearntheMACaddressofhostXonport0.TheframetorouterYisflooded.SwitchesAandBincorrectlylearntheMACaddressofhostXonport1.MACDatabaseInstability

SummaryBridgedandswitchednetworksarecommonlydesignedwithredundantlinksanddevices,whichcanintroduceproblems,suchasbroadcaststorms,multipleframetransmission,andMACdatabaseinstability.Abroadcaststormiswheneachswitchonaredundantnetworkfloodsbroadcastframesendlessly.Inaredundanttopology,multiplecopiesofthesameframecanarriveattheintendedhost,potentiallycausingproblemswiththereceivingprotocol.MACdatabaseinstabilityresultswhenmultiplecopiesofaframearriveondifferentportsofaswitch.

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