目录
1．单臂路由(图) ............................................................ 1 2.使用SVI实现VLAN间的通信（图） ........................ 6 3.跨交换机实现VLAN间的通信（图） ....................... 9
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
到此而层交换机配置完毕！
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 netmask 255.255.255.0 gateway 192.168.20.1
2.使用SVI实现VLAN间的通信（图） 环境：一台三层交换机，两台pc机
三层交换机的配置：
Switch>enable
Switch#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
创建vlan 10 20 Switch(config)#vlan 10 Switch(config-vlan)#vlan 20 Switch(config-vlan)#exit
配置SVI接口ip
Switch(config)#interface vlan 10
%LINK-5-CHANGED: Interface Vlan10, changed state to up Switch(config-if)#ip address 192.168.10.1 255.255.255.0 Switch(config-if)#no shutdown Switch(config-if)#interface vlan 20
%LINK-5-CHANGED: Interface Vlan20, changed state to up Switch(config-if)#ip address 192.168.20.1 255.255.255.0 Switch(config-if)#no shutdown Switch(config-if)#exit
改变接口模式并加入vlan
Switch(config)#interface fastEthernet 0/1 Switch(config-if)#switchport mode access Switch(config-if)#switchport access vlan 10
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to up Switch(config-if)#interface fastEthernet 0/2 Switch(config-if)#switchport mode access Switch(config-if)#switchport access vlan 20
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan20, changed state to up Switch(config-if)# 看三层交换机的路由表： Switch#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, Vlan10 C 192.168.20.0/24 is directly connected, Vlan20 Switch#
两主机的配置与单臂路由中两主机的配置一样
3.跨交换机实现VLAN间的通信（图）
环境：一台三层交换机，两台二层交换机，两台pc机
三层交换机的配置(SW3)
Switch>enable
Switch#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
创建vlan 10 、 20 并设置ip Switch(config)#vlan 10 Switch(config-vlan)#vlan 20
Switch(config-vlan)#exit Switch(config)#interface vlan 10
%LINK-5-CHANGED: Interface Vlan10, changed state to up Switch(config-if)#ip address 192.168.10.1 255.255.255.0 Switch(config-if)#no shutdown Switch(config-if)#interface vlan 20
%LINK-5-CHANGED: Interface Vlan20, changed state to up Switch(config-if)#ip address 192.168.20.1 255.255.255.0 Switch(config-if)#no shutdown Switch(config-if)#exit
设置接口模式并加入相应的vlan（注意trunk口的设置） Switch(config)#interface fastEthernet 0/1
Switch(config-if)#switchport mode trunk
Switch(config-if)#interface fastEthernet 0/1 Switch(config-if)#switchport access vlan 10
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to up
Switch(config)#interface fastEthernet 0/2 Switch(config-if)#switchport mode trunk Switch(config-if)#interface fastEthernet 0/2
Switch(config-if)#switchport access vlan 20
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan20, changed state to up
Switch#
看路由表
Switch#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, Vlan10 C 192.168.20.0/24 is directly connected, Vlan20
SW21的配置 Switch>enable
Switch#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#vlan 10 Switch(config-vlan)#exit
Switch(config)#interface fastEthernet 0/1
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)#interface fastEthernet 1/1 Switch(config-if)#switchport mode access Switch(config-if)#switchport access vlan 10 Switch(config-if)#exit Switch(config)#
SW22的配置 Switch>
Switch>en
Switch#
Switch#configure ter
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#inter fas 1/1
Switch(config-if)#switchport mode trunk
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/1, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/1, changed state to up
Switch(config-if)#switchport mode access Switch(config-if)#inter fas 2/1 Switch(config-if)#switchport mode trunk
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet2/1, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet2/1, changed state to up
Switch(config-if)#exit Switch(config)#vlan 20
Switch(config-vlan)#inter fas 1/1
Switch(config-if)#switchport access vlan 20 Switch(config-if)#
注意：两交换机之间的链接是trunk链路
4.以上配置在模拟器上都可实现 在模拟器上配置其中pc图片 上述三种方式pc机的配置都一样
验证：
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