网络设备实例：华为路由器单臂路由

需求:在局域网中,通过交换机上配置VLAN可以减少主机通信广播域的范围,当VLAN之间有部分主机需要通信,但交换机不支持三层交换时,可以采用一台支持802.1Q的路由器实现VLAN的互通。这需要在以太口上建立子接口,分配IP地址作为该VLAN的网关,同时启动802.1Q.

组网:路由器E0端口与交换机的上行trunk端口(第24端口)相连,交换机下行口划分3个VLAN,带若干主机.

拓扑图如下：

1.路由器的配置

[Router]

[Router]inter e0

[Router-Ethernet0]ip add 10.0.0.1 255.255.255.0

[Router-Ethernet0]inter e0.1 //定义子接口E0.1

[Router-Ethernet0.1]ip add 172.16.1.1 255.255.255.0

[Router-Ethernet0.1]vlan-type dot1q vid 1

//指定以太网子接口属于VLAN1,此命令应用在以太网子接口上。

只有配置了该命令之后，以太网子接口才会根据配置的VLAN ID 号在以太网帧头中嵌入VLAN 标签，

与该网口相连的交换机接口才能正确处理接收到的帧。

[Router-Ethernet0.1]inter e0.2 //定义子接口E0.2

[Router-Ethernet0.2]ip add 172.16.2.1 255.255.255.0

[Router-Ethernet0.2]vlan-type dot1q vid 2 //指定以太网子接口属于VLAN2

[Router-Ethernet0.2]inter e0.3 //定义子接口E0.3

[Router-Ethernet0.3]ip add 172.16.3.1 255.255.255.0

[Router-Ethernet0.3]vlan-type dot1q vid 3 //指定以太网子接口属于VLAN3

[Router-Ethernet0.3]inter e0

[Router-Ethernet0]undo shut

% Interface Ethernet0 is up

[Router-Ethernet0] //用网线将E0端口连到S3026第24端口

%19:46:32: Interface Ethernet0 changed state to UP

%19:46:32: Line protocol ip on interface Ethernet0, changed state to UP

%19:46:32: Line protocol ip on interface Ethernet0.1, changed state to UP

%19:46:32: Line protocol ip on interface Ethernet0.2, changed state to UP

%19:46:32: Line protocol ip on interface Ethernet0.3, changed state to UP

2.交换机的配置

sys

Enter system view , return user view with Ctrl+Z.

[Quidway]vlan 1

[Quidway-vlan1]vlan 2

[Quidway-vlan2]port ethernet 0/17 to eth 0/19 eth 0/22 //将第17至19端口，和第22端口加入VLAN2

[Quidway-vlan2]vlan 3

[Quidway-vlan3]port eth 0/21 //将第21端口加入VLAN2

[Quidway-vlan3]inter e0/24

[Quidway-Ethernet0/24]port link-type trunk //将第24端口设为trunk口

[Quidway-Ethernet0/24]port trunk permit vlan all//允许所有VLAN流量通过

Please wait........................................... Done.

[Quidway-Ethernet0/24]dis port trunk //检验TRUNK口配置

Now, the following trunking ports exist:

Ethernet0/24

[Quidway-Ethernet0/24]dis vlan 2　//检验VLAN2的配置

VLAN ID: 2

VLAN Type: static

Route Interface: not configured

Description: VLAN 0002

Tagged Ports:

Ethernet0/24

Untagged Ports:

Ethernet0/17 Ethernet0/18 Ethernet0/19 Ethernet0/22

[Quidway-Ethernet0/24]dis vlan 3　//检验VLAN3的配置

VLAN ID: 3

VLAN Type: static

Route Interface: not configured

Description: VLAN 0003

Tagged Ports:

Ethernet0/24

Untagged Ports:

Ethernet0/21