不同vlan之间通信的三种方式

不同vlan间的通信简单配置

1．单臂路由(图)

环境：一台路由器，一台二层交换机，两台pc机

二层交换机的配置

一般模式：

Switch>

输入enable进入特权模式：

Switch>enable

输入configure terminal进入全局配置模式：

Switch#configure terminal

Enter configuration commands, one per line. End with CNTL/Z. 创建vlan 10 和vlan 20：

Switch(config)#vlan 10

Switch(config-vlan)#vlan 20

Switch(config-vlan)# exit

进入接口配置模式：

Switch(config)#interface fastEthernet 0/1

把0/1变成trunk口（默认是access口）

Switch(config-if)#switchport mode trunk

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up

Switch(config-if)#exit

进入接口配置模式分别把对应的接口，加入对应的vlan：

Switch(config)#interface fastEthernet 1/1

Switch(config-if)#switchport mode access

Switch(config-if)#switchport access vlan 10

Switch(config-if)#interface fastEthernet 2/1

Switch(config-if)#switchport mode access

Switch(config-if)#switchport access vlan 20

到此二层交换机配置完毕！

路由器的配置：

Router>

Router>enable

Router#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#inter fas 0/0

Router(config-if)#no ip address

Router(config-if)#no shutdown

注意：单臂路由的配置父接口一定要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

Router(config-if)#exit

Router(config)#int fas 0/0.10

%LINK-5-CHANGED: Interface FastEthernet0/0.10, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0.10, changed state to up

Router(config-subif)#encapsulation dot1Q 10

注意：在配置ip时一定要先封装802.1q协议

Router(config-subif)#ip address 192.168.10.1 255.255.255.0

Router(config-subif)#no shutdown

Router(config-subif)#int fas 0/0.20

%LINK-5-CHANGED: Interface FastEthernet0/0.20, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0.20, changed state to up

Router(config-subif)#ip address 192.168.20.1 255.255.255.0

% Configuring IP routing on a LAN subinterface is only allowed if that subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q,

or ISL vLAN.

Router(config-subif)#encapsulation dot1Q 20

Router(config-subif)#ip address 192.168.20.1 255.255.255.0

Router(config-subif)#no shutdown

Router(config-subif)#

查看路由表：

Router#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

* - candidate default, U - per-user static route, o - ODR

P - periodic downloaded static route

Gateway of last resort is not set

C 192.168.10.0/24 is directly connected, FastEthernet0/0.10

C 192.168.20.0/24 is directly connected, FastEthernet0/0.20 Router#

PC0的配置：

ip 192.168.10.10

netmask 255.255.255.0

gateway 192.168.10.1

PC1的配置：

ip 192.168.20.20