配置生成树协议实现冗余链路,冗余链路和生成树协议的配合应用

多生成树协议，冗余备份，负载均衡

实验拓扑：

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R4上设置 R4>en R4#conf t R4(config)#no ip routing 去掉路由功能 R4(config)#vlan 10 R4(config-vlan)#vlan 20 R4(config-vlan)#inter f1/1 划分VLAN R4(config-if)#switchport access vlan 10 R4(config-if)#inter fa1/2 R4(config-if)#switchport access vlan 20 R4(config)#interface range f1/3 -4 设置成中继端口 R4(config-if-range)#switchport mode trunk R4(config-if-range)#switchport trunk encapsulation dot1q R4(config-if-range)#ex R2配置 R2>en R2#conf t R2(config)#no ip routing R2(config)#vlan 10 R2(config-vlan)#vlan 20 R2(config-vlan)#end R2(config)#interface range f1/1 -2 R2(config-if-range)#switchport mode trunk R2(config-if-range)#switchport trunk encapsulation dot1q R2(config-if-range)#ex R2(config)#spanning-tree vlan 10 root primary 生成树根优先级 VLAN 10 bridge priority set to 8192 VLAN 10 bridge max aging time unchanged at 20 VLAN 10 bridge hello time unchanged at 2 VLAN 10 bridge forward delay unchanged at 15 R2(config)#spanning-tree vlan 20 root secondary VLAN 20 bridge priority set to 16384 VLAN 20 bridge max aging time unchanged at 20 VLAN 20 bridge hello time unchanged at 2 VLAN 20 bridge forward delay unchanged at 15 在R3设置 R3>en R3#conf t R3(config)#no ip routing R3(config)#vlan 10 R3(config-vlan)#vlan 20 R3(config)#interface range f1/1 -2 R3(config-if-range)#switchport mode trunk R3(config-if-range)#switchport trunk encapsulation dot1q R3(config-if-range)#ex R3(config)#spanning-tree vlan 10 root secondary VLAN 10 bridge priority set to 16384 VLAN 10 bridge max aging time unchanged at 20 VLAN 10 bridge hello time unchanged at 2 VLAN 10 bridge forward delay unchanged at 15 R3(config)#spanning-tree vlan 20 root primary VLAN 20 bridge priority set to 8192 VLAN 20 bridge max aging time unchanged at 20 VLAN 20 bridge hello time unchanged at 2 VLAN 20 bridge forward delay unchanged at 15 在三层交换上配置！ R1>en R1#conf t R1(config)#vlan 10 R1(config)#vlan 20 R1(config)#interface range f1/0 -1 R1(config-if-range)#switchport mode trunk R1(config-if-range)#switchport trunk encapsulation dot1q R1(config-if-range)#inter vlan 10 R1(config-if)#ip address 192.168.10.1 255.255.255.0 R1(config-if)#no shut R1(config-if)#inter vlan 20 R1(config-if)#ip add R1(config-if)#ip address 192.168.20.1 255.255.255.0 R1(config-if)#no shut