注意：使用了路由器去模拟PC主机
步骤一：配置各PC的IP地址。
步骤二：在pc1上ping其它的主机结果是全部通的。
步骤三：将switch1和switch2的fa0/12的直连接口指定为干道
sw1(config)#inte fa0/12
sw1(config-if)#switchport trunk encapsulation dot1q
sw1(config-if)#switchport mode trunk
sw1(config-if)#exit
sw2(config)#inte fa0/12
sw2(config-if)#switchport trunk encapsulation dot1q
sw2(config-if)#switchport mode trunk
sw2(config-if)#exit
sw1#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Fa0/12 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/12 none
Port Vlans allowed and active in management domain
Fa0/12 none
Port Vlans in spanning tree forwarding state and not pruned
Fa0/12 none
sw2#show interfaces fastethernet0/12 switchport
Name: Fa0/12
Switchport: Enabled
Administrative mode: trunk
Operational mode: trunk
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Protected: false
Voice vlan: none (Inactive)
Appliance trust: none
PC1 PC2 PC5 PC6 可以相互PING通
PC3 PC4 PC7 PC8 可以相互PING通
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