ccnp 11 1introducing spanning tree features以伙伴關(guān)系幫助客戶成功員工合作伙伴

IntroducingSTPDescribingConfiguringspanning-treeportfast(interfacecommand)spanning-treeportfastdefault(global–enablesPortFastonallnontrunkingshowrunning-configinterfacefastethernetBackboneFast 的RootPort和原本處于Blocking狀態(tài)的端口都收到BPDU了。 BackboneFast[no]spanning-treebackbonefast(globalShowspanning-treeEnablingandVerifyingBPDU防?在配置了PortFast的端?上收到BPDU，如果配置了PortFast?收到BPDU，則使該端?進(jìn)入err-disableSwitch(config)#spanning-treeportfastbpduguardSwitch(config)#spanning-treeportfastbpduguardSwitch#showSwitch#showspanning-treesummary ysBPDUGuardconfigurationSwitch#showspanning-treesummarytotalsRootbridgefor:none.PortFastBPDUGuardisEtherchannelmisconfigurationguardisenabledUplinkFastisdisabledBackboneFastisDefaultpathcostmethodusedis BlockingListeningLearningForwardingSTP34 EnablingandVerifyingBPDUEnableBPDUSwitch(config)#spanning-treeEnableBPDUSwitch(config)#spanning-treeportfastbpdufilterSwitch#showspanning-treesummaryDispalysBPDUSwitch#showspanning-treesummarySwitch#showspanning-treesummaryRootRootbridgeEtherChannelmisconfigurationguardisenabledExtendedsystemID isdisabled isenabledbydefaultPortFastBPDUGuardisdisabledbydefaultPortfastBPDUFilterisenabledbydefault isdisabledbydefault is isdisabledPathcostmethodusedislongBlockingListeningLearningForwardingSTP200033 EnablingRootSwitch(config-if)#spanning-treeSwitch(config-if)#spanning-treeguardEnablesRootGuardonanVerifyingRootSwitch#showSwitch#showrunning-configinterfaceinterface ysinterfaceconfigurationSwitch#showSwitch#showspanning-tree ysinformationaboutportsininconsistentSwitch#showrunning-configinterfacefastethernet5/8Buildingconfiguration...Currentconfiguration:67!switchportmodeaccessspanning-treeguardroot

PortTypeInconsistentPortTypeInconsistentPortTypeInconsistentNumberofinconsistentports(segments)inthesystemBeforeLoopBeforeLoopGuardWithLoop*使用了LoopGuard后，就會使端口進(jìn)入“不一致環(huán)路”狀態(tài) ConfiguringLoopSwitch(config-if)#spanning-treeSwitch(config-if)#spanning-treeguardEnablesLoopGuardonanSwitch(config)#spanning-treeSwitch(config)#spanning-treeloopguardEnablesloopguardgloballyontheUnidirectionalLinkUDLDallowsdevicesconnectedUDLDallowsdevicesconnectedthroughfiber-opticorcopperEthernetcablestomonitorthephysicalconfigurationofthecablesanddetectwhenaunidirectionallinkexists.Unidirectionallinkscancauseavarietyofproblems,includingspanning-treetopologyloops.ConfiguringConfigurationconfigudldenable(allportnormaludldaggressive(allportaggressiveconfiginterfaceportudldport(portnormaludldportaggressive(portaggressiveResettingandVerifyingComparingLoopGuardandPotentialSTP雙工不匹配：當(dāng)一個(gè)鏈路的一端是半雙工的，而另一端是全雙工。這 單向鏈路故障:資源錯(cuò)誤:STP是在軟件中實(shí)現(xiàn),當(dāng)交換機(jī)過載使用CPU和內(nèi)存時(shí)，造PortFast配置錯(cuò)誤:連接交換機(jī)的兩個(gè)端口啟用快速端口，這可能會STP調(diào)整誤差:Maxageforwarddelay設(shè)置太短會導(dǎo)致一個(gè)環(huán)路。DuplexUnidirectionalLinkPortFastConfigurationSpanningTreedebugSwitch#debugSwitch#debugspanning-tree ysalldebuggingmessagesforspanningSwitch#debugSwitch#debugspanning-tree ysspanning-treetopologyeventsdebugSw