环路防护的验证.doc

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1、环路防护的验证1.先在SW3上启用bpdufilter，使用S2950收不到BPDU，形成环路。sw3#shrunintg1/0/11interfaceGigabitEthernet1/0/11spanning-treebpdufilterenables2950#shspanvlan1VLAN0001SpanningtreeenabledprotocolrstpRootIDPriority4097Address0019.e70e.c400Cost19Port10(FastEthernet0/10)HelloTime2

2、secMaxAge20secForwardDelay15secBridgeIDPriority32769(priority32768sys-id-ext1)Address000c.ce0e.3840HelloTime2secMaxAge20secForwardDelay15secAgingTime300InterfaceRoleStsCostPrio.NbrType------------------------------------------------------------------------Fa0/1

3、DesgFWD19128.1EdgeP2pFa0/2DesgFWD19128.2EdgeP2pFa0/10RootFWD19128.10P2pFa0/12DesgBLK19128.12P2ps2950#shspanvlan1InterfaceRoleStsCostPrio.NbrType------------------------------------------------------------------------Fa0/1DesgFWD19128.1EdgeP2pFa0/2DesgFWD19128.2

4、EdgeP2pFa0/10RootFWD19128.10P2pFa0/12DesgLRN19128.12P2ps2950#shspanvlan1InterfaceRoleStsCostPrio.NbrType------------------------------------------------------------------------Fa0/1DesgFWD19128.1EdgeP2pFa0/2DesgFWD19128.2EdgeP2pFa0/10RootFWD19128.10P2pFa0/12Des

5、gFWD19128.12P2p→二层环路，广播风暴2.接下来，在S2950上启用guardloops2950#shrunintf0/12interfaceFastEthernet0/12spanning-treeguardloop10:26:17:%SPANTREE-2-LOOPGUARD_BLOCK:LoopguardblockingportFastEthernet0/12onVLAN0001.s2950#shspanvlan1VLAN0001InterfaceRoleStsCostPrio.NbrType----

6、--------------------------------------------------------------------Fa0/1DesgFWD19128.1EdgeP2pFa0/2DesgFWD19128.2EdgeP2pFa0/10RootFWD19128.10P2pFa0/12DesgBKN*19128.12P2p*LOOP_Incs2950#shspaninconsistentportsNameInterfaceInconsistency----------------------------

7、--------------------------------VLAN0001FastEthernet0/12LoopInconsistentVLAN0002FastEthernet0/12LoopInconsistentVLAN0003FastEthernet0/12LoopInconsistentVLAN0004FastEthernet0/12LoopInconsisten