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一台思科1841路由器、一台C2950-24交换机和两台PC主机组成一个三叉戟形状的网络，利用单臂路由来实现VLAN间的路由通信，组网拓扑图如下：
第一台PC主机为静态ip，具体设置如下图：
第二台PC主机的ip配置：
交换机的配置命令如下：
Switch>
Switch>en
Switch>enable
Switch#conf
Switch#configure
Configuring from terminal, memory, or network [terminal]?
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#h
Switch(config)#hostname SW1
SW1(config)#vl
SW1(config)#vlan 2
SW1(config-vlan)#exit
SW1(config)#in f0/1
SW1(config-if)#sw
SW1(config-if)#switchport m
SW1(config-if)#switchport mode a
SW1(config-if)#switchport mode access
SW1(config-if)#sw
SW1(config-if)#switchport a
SW1(config-if)#switchport access v
SW1(config-if)#switchport access vlan 1
SW1(config-if)#in f0/2
SW1(config-if)#sw
SW1(config-if)#switchport m
SW1(config-if)#switchport mode a
SW1(config-if)#switchport mode access
SW1(config-if)#sw
SW1(config-if)#switchport a
SW1(config-if)#switchport access v
SW1(config-if)#switchport access vlan 2
SW1(config-if)#in f0/3
SW1(config-if)#sw
SW1(config-if)#switchport m
SW1(config-if)#switchport mode t
SW1(config-if)#switchport mode trunk
SW1(config-if)#exit
SW1(config)#
%LINK-5-CHANGED: Interface FastEthernet0/3, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to up
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Router>en
Router>enable
Router#conf
Router#configure
Configuring from terminal, memory, or network [terminal]?
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#h
Router(config)#hostname R1
R1(config)#in f0/0
R1(config-if)#no shu
R1(config-if)#no shutdown
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
R1(config-if)#in f0/0.1
%LINK-5-CHANGED: Interface FastEthernet0/0.1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0.1, changed state to up
R1(config-subif)#en
R1(config-subif)#encapsulation d
R1(config-subif)#encapsulation dot1Q 1 n
R1(config-subif)#encapsulation dot1Q 1 native
R1(config-subif)#ip add 172.16.1.1 255.255.255.0
R1(config-subif)#in f0/0.2
%LINK-5-CHANGED: Interface FastEthernet0/0.2, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0.2, changed state to up
R1(config-subif)#en
R1(config-subif)#encapsulation d
R1(config-subif)#encapsulation dot1Q 2
R1(config-subif)#ip add 172.16.2.1 255.255.255.0
R1(config-subif)#exit
R1(config)# | 
