单臂路由
是指在路由器的一个接口上通过配置子接口（或“逻辑接口”，并不存在真正物理接口）的方式，实现原来相互隔离的不同VLAN（虚拟局域网）之间的互联互通。
PC1（设置IP地址）
IP地址：192.168.10.1
子网掩码：255.255.255.0
网关：192.168.10.254
PC2（设置IP地址）
IP地址：192.168.20.1
子网掩码：255.255.255.0
网关：192.168.20.254
PC3（设置IP地址）
IP地址：192.168.30.1
子网掩码：255.255.255.0
网关：192.168.30.254
SW1（创建access链路和trunk链路）
<Huawei>system-view //进入视图模式
[Huawei]undo info-center enable //关闭信息告警
[Huawei]sysname SW1 //改名
[SW1]vlan batch 10 20 30 //创建VLAN10、VLAN20、VLAN30
[SW1]interface e0/0/1 //进入接口
[SW1-Ethernet0/0/1]port link-type access //创建access链路
[SW1-Ethernet0/0/1]port default vlan 10 //设置为VLAN10
[SW1-Ethernet0/0/1]quit //退出
[SW1]interface e0/0/2 //进入接口
[SW1-Ethernet0/0/2]port link-type access //创建access链路
[SW1-Ethernet0/0/2]port default vlan 20 //设置为VLAN20
[SW1-Ethernet0/0/2]quit //退出
[SW1]interface e0/0/3 //进入接口
[SW1-Ethernet0/0/3]port link-type access //创建access链路
[SW1-Ethernet0/0/3]port default vlan 30 //设置为VLAN30
[SW1-Ethernet0/0/3]quit //退出
[SW1]interface e0/0/4
[SW1-Ethernet0/0/4]port link-type trunk //设置为trunk链路
[SW1-Ethernet0/0/4]port trunk allow-pass vlan all //允许所有VLAN通过
[SW1-Ethernet0/0/4]quit //退出
[SW1]
R1（配置单臂路由）
<Huawei>system-view //进入视图模式
[Huawei]undo info-center enable //关闭信息告警
[Huawei]sysname R1 //改名
[R1]interface g0/0/0.10 //进入子接口
[R1-GigabitEthernet0/0/0.10]dot1q termination vid 10 //设置VLAN10标记
[R1-GigabitEthernet0/0/0.10]ip address 192.168.10.254 24 //设置IP地址
[R1-GigabitEthernet0/0/0.10]arp broadcast enable //开启ARP广播
[R1-GigabitEthernet0/0/0.10]quit //退出
[R1]interface g0/0/0.20 //进入子接口
[R1-GigabitEthernet0/0/0.20]dot1q termination vid 20 //设置VLAN20标记
[R1-GigabitEthernet0/0/0.20]ip address 192.168.20.254 24 //设置IP地址
[R1-GigabitEthernet0/0/0.20]arp broadcast enable //开启ARP广播
[R1-GigabitEthernet0/0/0.20]quit //退出
[R1]interface g0/0/0.30 //进入子接口
[R1-GigabitEthernet0/0/0.30]dot1q termination vid 30 //设置VLAN30标记
[R1-GigabitEthernet0/0/0.30]ip address 192.168.30.254 24 //设置IP地址
[R1-GigabitEthernet0/0/0.30]arp broadcast enable //开启ARP广播
[R1-GigabitEthernet0/0/0.30]quit //退出
[R1]
R1（查看接口IP地址）
[R1]dis ip interface brief //查看接口IP地址
*down: administratively down
^down: standby
(l): loopback
(s): spoofing
The number of interface that is UP in Physical is 5
The number of interface that is DOWN in Physical is 2
The number of interface that is UP in Protocol is 4
The number of interface that is DOWN in Protocol is 3
Interface IP Address/Mask Physical Protocol
GigabitEthernet0/0/0 unassigned up down
GigabitEthernet0/0/0.10 192.168.10.254/24 up up //子接口，相当于PC1的网关
GigabitEthernet0/0/0.20 192.168.20.254/24 up up //子接口，相当于PC2的网关
GigabitEthernet0/0/0.30 192.168.30.254/24 up up //子接口，相当于PC3的网关
GigabitEthernet0/0/1 unassigned down down
GigabitEthernet0/0/2 unassigned down down
NULL0 unassigned up up(s)
[R1]
PC1（测试是否可以全网互通）
PC>ping 192.168.20.1 //测试是否可以ping通PC2
Ping 192.168.20.1: 32 data bytes, Press Ctrl_C to break
Request timeout!
From 192.168.20.1: bytes=32 seq=2 ttl=127 time=78 ms //ping通
From 192.168.20.1: bytes=32 seq=3 ttl=127 time=62 ms
From 192.168.20.1: bytes=32 seq=4 ttl=127 time=93 ms
From 192.168.20.1: bytes=32 seq=5 ttl=127 time=62 ms
--- 192.168.20.1 ping statistics ---
5 packet(s) transmitted
4 packet(s) received
20.00% packet loss
round-trip min/avg/max = 0/73/93 ms
PC>ping 192.168.30.1 //测试是否可以ping通PC3
Ping 192.168.30.1: 32 data bytes, Press Ctrl_C to break
Request timeout!
From 192.168.30.1: bytes=32 seq=2 ttl=127 time=78 ms //ping通
From 192.168.30.1: bytes=32 seq=3 ttl=127 time=94 ms
From 192.168.30.1: bytes=32 seq=4 ttl=127 time=78 ms
From 192.168.30.1: bytes=32 seq=5 ttl=127 time=62 ms
--- 192.168.30.1 ping statistics ---
5 packet(s) transmitted
4 packet(s) received
20.00% packet loss
round-trip min/avg/max = 0/78/94 ms
PC>
