链路捆绑与STP

1、 实验五 链路捆绑与STP1 实验目的1. 组网需求：采用两台核心交换机组网来提高网络可靠性，为防止二层环路，需要全网运行STP将SW1部署为根网桥，SW2部署为备份根网桥，并将接入PC的接口配置为portfast端口；SW1-SW2之间使用链路捆绑进一步提高可靠性。2. 分析STP的选举过程（根网桥、跟端口、指定端口、阻塞端口）。3. 测试STP切换，并分析STP的端口状态切换过程。2 实验拓扑三实验步骤1. 基本信息配置 SW1的基本信息配置（SW2、SW3的基本配置与SW1相同）Switch>enable /进入特权模式Switch#config terminal /进入全局配置模

2、式Switch(config)#hostname SW3 /配置主机名SW3(config)#no ip domain-lookup /禁用域名查找SW3(config)#line console 0 /进入Console线路模式SW3(config-line)#logging synchronous /配置Console信息显示自动换行SW3(config-line)#no login /配置口Console登录不认证SW3(config-line)#privilege level 15 SW3(config-line)#line vty 0 4 / 进入Vty线路模式SW3(config-

3、line)#no login /配置Telnet登录不认证SW3(config-line)#privilege level 15 /配置为最高特权级别，enable不需要密码2. 二层网络全局配置（1）SW1的Vlan配置SW1# vlan database SW1(vlan)#vtp transparent /透明模式SW1(vlan)#vlan 8SW1(vlan)#vlan 10SW1(vlan)#vlan 11SW1#show vlan-sw briefVLAN Name Status Ports 8 VLAN0008 active 10 VLAN0010 active /Vlan 创

4、建成功11 VLAN0011 active (2) SW2的Vlan配置SW2# vlan database SW2(vlan)#vtp transparent SW2(vlan)#vlan 8SW2(vlan)#vlan 10SW2(vlan)#vlan 11SW2#show vlan-sw brief /查看Vlan信息VLAN Name Status Ports 8 VLAN0008 active 10 VLAN0010 active 11 VLAN0011 active （3） SW3的Vlan配置SW3# vlan database SW3(vlan)#vtp transparent

5、 SW3(vlan)#vlan 8SW3(vlan)#vlan 10SW3(vlan)#vlan 11SW3#show vlan-sw brief /查看Vlan信息VLAN Name Status Ports 8 VLAN0008 active 10 VLAN0010 active /Vlan 创建成功11 VLAN0011 active （4） STP根网桥配置SW1(config)#spanning-tree vlan 8 priority 0SW1(config)#spanning-tree vlan 10 priority 0SW1(config)#spanning-tree vla

6、n 11 priority 0（5） STP备份根网桥配置SW2(config)#spanning-tree vlan 8 priority 4096SW2(config)#spanning-tree vlan 10 priority 4096SW2(config)#spanning-tree vlan 11 priority 40963. 二层网络接口配置及链路测试（1） 核心交换机SW1-SW2链路捆绑配置及调测SW1(config)#interface range fa0/1 -2 /以太网接口1和2，注意1后面要空格SW1(config-if-range)#switchport tru

7、nk encapsulation dot1qSW1(config-if-range)#switchport mode trunk SW1(config-if-range)#switchport trunk allowed vlan allSW1(config-if-range)#channel-group 2 mode on/手动捆绑：组2SW2(config)#interface range fa0/1 -2 /以太网接口1和2，注意1后面要空格SW2(config-if-range)#switchport trunk encapsulation dot1qSW2(config-if-ran

8、ge)#switchport mode trunk SW2(config-if-range)#switchport trunk allowed vlan allSW2(config-if-range)#channel-group 2 mode on/手动捆绑：组2SW1#show etherchannel summary /查看以太网通道信息Flags: D - down P - in port-channel I - stand-alone s - suspende R - Layer3 S - Layer2 U - in useGroup Port-channel Ports-+-+- 2

9、 Po2(SU) Fa0/1(P) Fa0/2(P)SW2#show etherchannel summary /查看以太网通道信息Flags: D - down P - in port-channel I - stand-alone s - suspende R - Layer3 S - Layer2 U - in useGroup Port-channel Ports-+-+- 2 Po2(SU) Fa0/1(P) Fa0/2(P)（2） SW1-SW3的Trunk链路调测SW1(config)#interface fa0/3SW1(config-if)#switchport trunk

10、encapsulation dot1qSW1(config-if)#switchport mode trunk SW1(config-if)#switchport trunk allowed vlan allSW1#show interfaces trunk /查看Trunk信息（只粘贴本步有用信息）Port Mode Encapsulation Status Native vlanFa0/3 on 802.1q trunking 1SW3(config)#interface fa0/1SW3(config-if)#switchport trunk encapsulation dot1qSW3

11、(config-if)#switchport mode trunk SW3(config-if)#switchport trunk allowed vlan allSW3#show interfaces trunk /查看Trunk信息（只粘贴本步有用信息）Port Mode Encapsulation Status Native vlanFa0/1 on 802.1q trunking 1（3） SW2-SW3的Trunk链路调测SW2(config)#interface fa0/3SW2(config-if)#switchport trunk encapsulation dot1qSW2(

12、config-if)#switchport mode trunk SW2(config-if)#switchport trunk allowed vlan allSW2#show interfaces trunk /查看Trunk信息Port Mode Encapsulation Status Native vlanFa0/3 on 802.1q trunking 1SW3(config)#interface fa0/2SW3(config-if)#switchport trunk encapsulation dot1qSW3(config-if)#switchport mode trunk

13、SW3(config-if)#switchport trunk allowed vlan allSW3#show interfaces trunk /查看Trunk信息Port Mode Encapsulation Status Native vlanFa0/2 on 802.1q trunking 1（4） SW3的Access接口配置SW3(config)#interface fa0/10 /与PC1相连的接口SW3(config-if)#switchport mode access SW3(config-if)#switchport access vlan 10SW3(config-if

14、)#spanning-tree portfast /配置成Portfast端口SW3(config-if)#exitSW3(config)#interface fa0/11 /与PC1相连的接口SW3(config-if)#switchport mode access SW3(config-if)#switchport access vlan 11SW3(config-if)#spanning-tree portfast /配置成Portfast端口SW3#show vlan-sw brief /查看Vlan信息VLAN Name Status Ports10 VLAN0010 active

15、Fa0/1011 VLAN0010 active Fa0/11（5） 二层设备网管地址配置/为SW2配置网管接口SW2(config)#interface vlan 8 SW2(config-if)#ip address 192.168.8.130 255.255.255.128SW2(config-if)#no shutdownSW2(config-if)#exit SW2(config)#ip default-gateway 192.168.8.129/为SW3配置网管接口SW3(config)#interface vlan 8SW3(config-if)#ip address 192.1

16、68.8.131 255.255.255.128SW3(config-if)#no shutdownSW3(config-if)#exit SW3(config)#ip default-gateway 192.168.8.129 （6） 二层网络STP调测SW1#show spanning-tree brief /查看生成树简要信息VLAN8 Spanning tree enabled protocol ieee Root ID Priority 0 Address cc00.0ed8.0001 This bridge is the root Hello Time 2 sec Max Age

17、20 sec Forward Delay 15 sec Bridge ID Priority 0 Address cc00.0ed8.0001 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 0 Interface Designated Name PortID Prio Cost Sts Role FastEthernet0/3 128.4 128 19 FWD Desg Port-channel2 129.65 128 12 FWD Desg /都为指定端口，转发状态 VLAN10 Spanning tree e

18、nabled protocol ieee Root ID Priority 0 Address cc00.0ed8.0002 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 0 Address cc00.0ed8.0002 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 0 Interface Designated Name PortID Prio Cost Sts Rol

19、e FastEthernet0/3 128.4 128 19 FWD Desg Port-channel2 129.65 128 12 FWD Desg /都为指定端口，转发状态 Vlan11 。 SW2#show spanning-tree briefVLAN8 Spanning tree enabled protocol ieee Root ID Priority 0 Address cc00.0ed8.0001 Cost 12 Port 321 (Port-channel2) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bri

20、dge ID Priority 4096 Address cc01.0ed8.0001 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 0 Interface Designated Name Port ID Prio Cost Sts Role FastEthernet0/3 128.4 128 19 FWD DesgPort-channel2 129.65 128 12 FWD Root/Fa0/3为指定端口，Po2为跟端口，都为转发状态。Vlan 10 、Vlan 11 。SW3#show spanning-t

21、ree briefVLAN8 Spanning tree enabled protocol ieee Root ID Priority 0 Address cc00.0ed8.0001 Cost 19 Port 2 (FastEthernet0/1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 4096 Address cc02.0ed8.0001 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 0 Interfac

22、e Designated Name PortID Prio Cost Sts Role FastEthernet0/1 128.2 128 19 FWD Root FastEthernet0/2 128.3 128 19 BLK Altn /Fa0/1为根端口，转发状态；Fa0/2为其他端口，阻塞状态。VLAN10 Spanning tree enabled protocol ieee Root ID Priority 0 Address cc00.0ed8.0002 Cost 19 Port 2 (FastEthernet0/1) Hello Time 2 sec Max Age 20 se

23、c Forward Delay 15 sec Bridge ID Priority 4096 Address cc02.0ed8.0002 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 0 Interface DesignatedName PortID Prio Cost Sts Role FastEthernet0/1 128.2 128 19 FWD RootFastEthernet0/2 128.3 128 19 BLK AltnFastEthernet0/10 128.11 128 19 FWD Desg

24、/Fa0/1为根端口，转发状态；Fa0/2为其他端口，阻塞状态；Fa0/10为指定端口，转发状态。Vlan11。4. 三层网络接口配置 SW1(config)#ip routing /启动三层交换机的路由SW1(config)#interface vlan 8 /Vlan 8 的路由点SW1(config-if)#ip address 192.168.8.129 255.255.255.128SW1(config-if)#no shutdown SW1(config-if)#exit SW1(config)#interface vlan 10 /Vlan 10 的路由点SW1(config-if)#ip address 192.168.10.1 255.255.255.0SW1(config-if)#no shutdown SW1(config-if)#exit SW1(config)#interface vlan 11 /Vlan 11的路由点SW1(config-if)#ip address 192.168.11.1 255.255.255.0SW1(config-if)#no shutdown SW1(config-if)#exit 5. STP切换测试SW3(config)#interface fa0/1SW3(confi