1、SwitchA(config)#spanning-tree !开启生成树协议 SwitchA(config)#end验证测试:验证生成树协议已经开启SwitchA#show spanning-tree interface fastthernet 0/1 !显示交换机接口fastthernet 0/1的状态第二步:设置生成树模式SwitchA(config)#spanning-tree mode stp !设置生成树模式为STP (802.1D)验证生成树协模式为802.1D第三步:设置交换机的优先级SwitchA(config)#spanning-tree priority 4096 !设置交
2、换机SwitchA的优先级为4096, 数值最小的交换机为根交换机(也称根桥),交换机SwitchB的优先级采用默认优先级(32768),因此SwitchA将成为根交换机。验证交换机SwitchA的优先级第四步:综合验证测试. 验证交换机SwitchA的端口F0/和F0/的状态SwitchA#show spanning-tree interface fastEthernet 0/1 !显示SwitchB的端口fastthernet 0/1的状态SwitchA#show spanning-tree interface fastEthernet 0/2 !显示SwitchB的端口fastthern
3、et 0/2的状态2. 验证网络拓扑发生变化时,ping的丢包情况C:ping 192.168.0.16 t !从主机PC1 ping PC2(用连续ping),然后拔掉SwitchA与SwitchB的端口F0/1之间的连线,观察丢包情况。显示结果如下:3. 验证网络拓扑发生变化时,交换机SwitchA的端口的状态变化,并观察生成树的收敛时间显示SwitchA的端口fastthernet 0/2的状态指导书代码:【实验拓扑】 【实验设备】 S2126G(2台) 【实验步骤】 SwitchA#show spanning-tree !显示交换机生成树的状态StpVersion : MSTPSysS
4、tpStatus : EnabledBaseNumPorts : 24MaxAge : 20HelloTime : 2ForwardDelay : 15BridgeMaxAge :BridgeHelloTime :BridgeForwardDelay :MaxHops :TxHoldCount : 3PathCostMethod : LongBPDUGuard : DisabledBPDUFilter :# MST 0 vlans mapped : AllBridgeAddr : 00d0.f8ef.9e89Priority : 32768TimeSinceTopologyChange : 0
5、d:0h:0m:8sTopologyChanges : 0DesignatedRoot : 800000D0F8EF9D09RootCost : 200000RootPort : Fa0/1CistRegionRoot : 800000D0F8EF9E89CistPathCost :PortAdminPortfast :PortOperPortfast :PortAdminLinkType : autoPortOperLinkType : point-to-pointPortBPDUGuard:PortBPDUFilter:PortState : forwarding !显示接口fastthe
6、rnet 0/1处于转发(forwarding)状态PortPriority : 128PortDesignatedRoot :PortDesignatedCost :PortDesignatedBridge :PortDesignatedPort : 8001PortForwardTransitions : 1PortAdminPathCost :PortOperPathCost :PortRole : rootPortSwitchA#show spanning-tree STP7m:0s 4096 26 100000D0F8EF9E89. 验证交换机SwitchB的端口F0/和F0/的状态
7、SwitchB#show spanning-tree interface fastEthernet 0/1 ! forwarding!SwitchB的端口fastthernet 0/处于转发(forwarding)状态 200000D0F8EF9E89 8002 22SwitchB#show spanning-tree interface fastEthernet 0/2 ! discarding!SwitchB的端口fastthernet 0/2处于阻塞(discarding)状态 39 alternatePortping 192.168.0.136 t !以上结果显示丢包数为30个。3.
8、验证网络拓扑发生变化时,交换机SwitchB的端口的状态变化,并观察生成树的收敛时间SwitchB的端口fastthernet 0/2转变为转发(forwarding)状态,转换时间大约32秒 402003-04-27 23:27:24 5-LINKUPDOWN:Fa0/2 changed state to up53 4-TOPOCHANGE:Topology is changedSwitchB的端口fastthernet 0/2转变为阻塞(discarding)状态,转换时间大约31秒【注意事项】锐捷交换机缺省是关闭spanning-tree的,因此,如果网络在物理上存在环路,则必须手工开启spanning-tree 。【参考配置】SwitchA#show run ! 交换机SwitchA的全部配置Building configuration.Current configuration : 122 bytes!version 1.0hostname SwitchAspanning-tree mode stpspanning-treespanning-tree mst 0 priority 4096endSwitchB#show run ! 交换机SwitchB的全部配置 85 byteshostname SwitchB
copyright@ 2008-2023 冰点文库 网站版权所有
经营许可证编号:鄂ICP备19020893号-2