单臂路由（router-on-a-stick）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）之间的互联互通优点：实现不同vlan之间的通信，有助理解、学习VLAN原理和子接口概念。缺点：容易成为网络单点故障，配置稍有复杂，现实意义不大。
工具/原料
win7-64
华为的eNSP
方法/步骤
1、配置基本拓扑结构一台主路由器、二台交换机、二台测试路由器，测试路由器充当电脑使用
2、配置接口IP地址R1的接口：[R1-GigabitEthernet0/0/1]ipaddress10.0.2.2255.255.255.0R2的接口：[R2-GigabitEthernet0/0/2]ipaddress10.0.3.2255.255.255.0R3的接口：interfaceGigabitEthernet0/0/1ipaddress10.0.2.1255.255.255.0interfaceGigabitEthernet0/0/2ipaddress10.0.3.1255.255.255.0
3、关闭S2的G0/0/4接口并SS2的G0/0/09接口加入VLAN3[S2]interfaceGigabitEthernet0/0/4[S2-GigabitEthernet0/0/4]shutdown[S2]interfaceGigabitEthernet0/0/9[S2-GigabitEthernet0/0/9]portlink-typeaccess[S2-GigabitEthernet0/0/9]portdefaultvlan3[S1]interfaceGigabitEthernet0/0/9[S1-GigabitEthernet0/0/9]portlink-typeaccess[S1-GigabitEthernet0/0/9]portdefaultvlan3
4、将S1的G0/0/4接口改成TRUNK模式，允许通过VLANVLAN3[S1]interfaceGigabitEthernet0/0/4[S1-GigabitEthernet0/0/4]portdefaultvlan1[S1-GigabitEthernet0/0/4]portlink-typetrunk[S1-GigabitEthernet0/0/4]porttrunkallow-passvlan23
5、在R3上的G0/0/1接口上配置子接口，同时在子接口配置ip地址，把接口配置成Dot1q,终结以太网接子接口[R4]interGigabitEthernet0/0/1.2[R4-GigabitEthernet0/0/1.2]control-vid20dot1q-termination[R4-GigabitEthernet0/0/1.2]dot1qterminationvid2[R4-GigabitEthernet0/0/1.2]arpbroadcastenable[R4-GigabitEthernet0/0/1.2]ipaddress10.0.20.124[R4-GigabitEthernet0/0/1.2]interGigabitEthernet0/0/1.3[R4-GigabitEthernet0/0/1.3]control-vid30dot1q-termination[R4-GigabitEthernet0/0/1.3]dot1qterminationvid3[R4-GigabitEthernet0/0/1.3]arpbroadcastenable[R4-GigabitEthernet0/0/1.3]ipaddress10.0.30.124
6、更改RR2的IP地址和网关[R1]interGigabitEthernet0/0/1[R1-GigabitEthernet0/0/1]ipaddress10.0.20.224[R1-GigabitEthernet0/0/1]quit[R1]undoiproute-static0.0.0.0010.0.2.1[R1]iproute-static0.0.0.0010.0.20.1[R2]interfaceGigabitEthernet0/0/2[R2-GigabitEthernet0/0/2]ipaddress10.0.30.224[R2-GigabitEthernet0/0/2]quit[R2]undoiproute-static0.0.0.0010.0.3.1[R2]iproute-static0.0.0.0010.0.30.1
7、验证实验结果[R1]ping-c110.0.30.2PING10.0.30.2:56databytes,pressCTRL_CtobreakReplyfrom10.0.30.2:bytes=56Sequence=1ttl=254time=3ms---10.0.30.2pingstatistics---1packet(s)transmitted1packet(s)received0.00%packetlossround-tripmin/avg/max=3/3/3ms
