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
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