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1、word图一Cisco Packet Tracer实验图对上图的一些说明：两个交换机通过两个GigabitEthernet端口相连。共创建两个VLAN，Vlan 100与Vlan 200。一、利用switchport trunk allowed vlan vlanid命令实现Vlan负载均衡分别在两个交换机上创建两个VLan:SwitchenSwitch#conf tEnter configuration mands, one per line. End with TL/Z.Switch(config)#vlan 100Switch(config-vlan)#vlan 200Switch(co
2、nfig-vlan)#查看创建的Vlan信息Switch(config-vlan)#do show vlanSwitch(config-vlan)#在两个计算机上把相应的端口划到两个VLan内。Switch(config-vlan)#int f0/1Switch(config-if)#switchport mode accessSwitch(config-if)#switchport access vlan 100Switch(config-if)#int fa0/2Switch(config-if)#switchport mode accessSwitch(config-if)#switch
3、port access vlan 200Switch(config-if)#配置trunk端口：Switch(config-if)#int gig0/1Switch(config-if)#switchport trunk encapsulation dot1qSwitch(config-if)#switchport mode trunkSwitch(config-if)#switchport trunk allowed vlan 100Switch(config-if)#int gig0/2Switch(config-if)#switchport trunk encapsulation dot
4、1qSwitch(config-if)#switchport mode trunkSwitch(config-if)#switchport trunk allowed vlan 200Switch(config-if)#为计算机配置IP地址，检查网络是否通畅： Vlan 100的网络地址：192.168.100.0；Vlan 200的网络地址：192.168.200.0以上配置实现了每个Vlan一个专用链路，实现了负载均衡。当某一个链路Down掉后，其中的一个Vlan通信将中断。二、利用STP实现Vlan的负载均衡与链路冗余备份去掉前面的一些配置：Switch(config-if)#no sw
5、itchport trunk allowed vlan 200Switch(config-if)#int gig0/1Switch(config-if)#no switchport trunk allowed vlan 100Switch(config-if)#为Vlan配置STP：在一个交换上配置：SwitchenSwitch#conf tEnter configuration mands, one per line. End with TL/Z.Switch(config)#spanning-tree vlan 100 root primarySwitch(config)#在另一个交换相配
6、置：SwitchenSwitch#conf tEnter configuration mands, one per line. End with TL/Z.Switch(config)#spanning-tree vlan 200 root primarySwitch(config)#在一个交换机查看配置：Switch#sh spanning-tree vlan 100VLAN0100 Spanning tree enabled protocol ieee Root ID Priority 24676 Address Cost 4 Port 25(GigabitEthernet0/1) Hel
7、lo Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32868 (priority 32768 sys-id-ext 100) Address Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 20Interface Role Sts Cost Prio.Nbr Type- - - - - -Gi0/2 Altn BLK 4 P2pGi0/1 Root FWD 4 P2pFa0/1 Desg FWD 19 P2pSwitch#sh
8、spanning-tree vlan 200VLAN0200 Spanning tree enabled protocol ieee Root ID Priority 24776 Address This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 24776 (priority 24576 sys-id-ext 200) Address Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging T
9、ime 20Interface Role Sts Cost Prio.Nbr Type- - - - - -Gi0/2 Desg FWD 4 P2pGi0/1 Desg FWD 4 P2pFa0/2 Desg FWD 19 P2pSwitch#在另一个交换查看配置：Switch#sh spanning-tree vlan 100VLAN0100 Spanning tree enabled protocol ieee Root ID Priority 24676 Address Cost 4 Port 25(GigabitEthernet0/1) Hello Time 2 sec Max Age
10、 20 sec Forward Delay 15 sec Bridge ID Priority 32868 (priority 32768 sys-id-ext 100) Address Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 20Interface Role Sts Cost Prio.Nbr Type- - - - - -Gi0/2 Altn BLK 4 P2pGi0/1 Root FWD 4 P2pFa0/1 Desg FWD 19 P2pSwitch#sh spanning-tree vlan 20
11、0VLAN0200 Spanning tree enabled protocol ieee Root ID Priority 24776 Address This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 24776 (priority 24576 sys-id-ext 200) Address Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 20Interface Role Sts Cost Prio.Nbr Type- - - - - -Gi0/2 Desg FWD 4 P2pGi0/1 Desg FWD 4 P2pFa0/2 Desg FWD 19 P2pSwitch#从上面的信息中看出来什么了吗？图 二手动把一条链路Down掉，每个Vlan的计算机仍然可以互相访问。图三图四 /
