CISCO中生成樹協(xié)議的配置

1、實驗一生成樹（STP）一、實驗?zāi)康?）：本實驗的目的是通過配置以下三種拓樸圖，讓我們對生成樹的工作原理有更深的認(rèn)識。2）:掌握生成樹在交換機(jī)上的配置方法，對生成樹在網(wǎng)絡(luò)上的應(yīng)用有更深的了解二、實驗要求：1）：簡述生成樹協(xié)議的三個前提。2）:簡述根橋、根端口、指定端口的選舉原則。三、實驗內(nèi)容：1、通過三種拓樸圖來研究根橋、根端口、指定端口選舉方法；2、根橋、根端口、指定端口查看方法四、實驗步驟：第一種：實驗拓樸：1）查看三臺交換機(jī)那個臺是根橋在交換機(jī)上使用命令showspanning-treevlan1或showspanning-treebrif可以查看當(dāng)前網(wǎng)絡(luò)中的根橋、根端口、指定端口。如下：

2、SWlflshspdlining-btiVLAfflSpanningtreeenabledprotocoliccc皿n昭nnnnnipr女ThisbridgeisrootFasiPthsmBtO/lHelloTime2secAge20srcForwardDelay15secBridgeIDPriority32768AddressccOO.0a30,0000EelloTime2secMaxAge20secForwardDelay15secAgingTime300Interface可編輯合同范本DesignatedNdmePortIDPrioCostICastBridgeIDPurlIDPatPt

3、KpynA+126,212019FWD10FVDSpanningtreeenabledprotocolieeeRooLIDPrioriLy32768AddressccOO.0&30.0000Cost19Port.2CFastEt.hernst0/1)HelloTime2secMaxAge20secForwardDelay15secBridgeIDPriority32768AddressHelloTime2secMaxAge20seeForwardDelay15secAgingTime30CSW2#tshspanning-treebriVLANIInterfaceNameDesignatedPo

4、rtII)PrioCostStsCostBridgfiIIPortIDFastEthemetO/1FantEthcrfictO/2FastEthemetO/1FantEthcrfictO/2可以看出SW!為根橋，SW2為非根橋，用同樣的命令查看第三臺交換機(jī)。2)現(xiàn)在修改SW2的優(yōu)先級讓它成為根橋在交換機(jī)上使用此命令spanning-treevlan1priority4096SW2(config)#spanning-treevlan1priority4096SW2#shspanning-treebri查看spanning-treeSVSItshspanRing-treebriVLAN1Spann

5、ingtreeenabledprotocolieeeRootIDPriority4096AddressThisbridgelbtherootHelloTime2secMaxAge20secForwardDelay15secBridgeIDPriority4096AddressHelloTime2seehkxAge20seeForwardDelay15seeAgingTine300InterfaceDesignatedNamePortIDPrioCostStsCostBridgeIDPortID第二種：實驗拓樸FastEthernetO/1126.212819FIDFastEthernetO/2

6、128.312819FWD04096ccOO.0f91DODO12&31）查看二臺交換機(jī)那個臺是根橋在交換機(jī)上使用命令showspanning-treevlan1或showspanning-treebrif可以查看當(dāng)前網(wǎng)絡(luò)中的根橋、根端口、指定端口。SI2咖hgpanning-treebriVLAN1SpanningRootIDtreeenabledprotocolieeePricrity32768kAddressCost19Port2(FastEthernetO/1)HelloTime2secUaxAge20Priority32768AddreccccOOllOeS.0000HelloTim

7、e9secUaxKge20AingTime300BridgeIDsecForwardsecForwardDelay15Delay15secsecTnt.ftrfaceNamePortIDFrioCostStsDfisignatedCostBridgeIDPortID2a:b:FastEthernelO/1FastEUiernelO/2可以看到交換機(jī)SW2上的)128.2128128.3126FO/1是轉(zhuǎn)發(fā)狀態(tài),19FWD019BLK0F0/2是阻斷狀態(tài)。c:指定為根端口方法有：改變接口上的cost值（在本端修改）命令為spanning-treevlan1cost20改變發(fā)送者接口上ID值（在對

8、端修改）命令為spanning-treevlan1port-priority96注：port-priority后的值是16倍數(shù)在物理上改變在這就不作詳解了。步聚如下：第一種方法：在本端修改接口cost值SW2(config)#intfa0/1SW2(config-if)#spanning-treevlan1cost20SW2#shspanning-treebriSI2UshspanningtreebriVLAN1InterfaceNajnePortIDFrioCostDesignatedStsCostBridgeIDPortIDForwardDelay15secSpanringtreeenab

9、ledprotocolieeeRootIDPriorityAddressCostPortHelloTime32758193(FastEthernetO/2)2secMaxA前20secBridgeIDPriority32768AddressccOO.la48.0000HelloTime3sec血掘Age20setAgingTime300ForwardDelay15secFastEthernetO/1128.212820BLK03276&FVD第二種方法：在對端修改發(fā)送者接口ID值SW1(config)#intfaO/2SW1(config-if)#spanning-treevlan1priority96SW2#shspanning-treebri(在對端查看)第三種：實驗拓樸1)在一臺交換上要修改根端口，則