CISCO VLAN间路由的两种方式

1 单臂路由配置

Switch> Switch>enable Switch#config Configuring from terminal, memory, or network [terminal]? Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#interface f0/1 Switch(config-if)#switchport mode access Switch(config-if)#switchport access vlan 10 % Access VLAN does not exist. Creating vlan 10 Switch(config-if)#interface f0/2 Switch(config-if)#switchport mode access Switch(config-if)#switchport access vlan 20 % Access VLAN does not exist. Creating vlan 20 Switch(config-if)#interface f0/3 Switch(config-if)#switchport trunk en? % Unrecognized command Switch(config-if)#switchport port Switch(config-if)#switchport mode trunk Switch(config-if)#switchport trunk ? allowed Set allowed VLAN characteristics when interface is in trunking mode native Set trunking native characteristics when interface is in trunking   mode Switch(config-if)#switch trunk allow vlan all

Router>enable Router#config Router(config)#interface f0/0 Router(config-if)#no shutdown Router(config-if)#interface f0/0.10 Router(config-subif)#encapsulation dot1Q ? <1-1005> IEEE 802.1Q VLAN ID Router(config-subif)#encapsulation dot1Q 10 Router(config-subif)#ip address 172.16.10.254 255.255.255.0 Router(config-subif)#interface f0/0.20 Router(config-subif)#encapsulation dot1Q 20 Router(config-subif)#ip address 172.168.20.254 255.255.255.0 Router(config-subif)#end Router#copy runn start

会用到的一些命令：

show ip route

show running-config

ping ip

tracert ip

2 VLAN三层交换配置

PC1 PC2

Switch>enable Switch#config terminal Switch(config)#interface f0/1 Switch(config-if)#switchport mode access Switch(config-if)#switchport access vlan 10 % Access VLAN does not exist. Creating vlan 10 Switch(config-if)#interface f0/2 Switch(config-if)#switchport mode access Switch(config-if)#switchport access vlan 20 % Access VLAN does not exist. Creating vlan 20 Switch(config-if)#interface vlan 10 Switch(config-if)#ip address 192.168.10.1 255.255.255.0 Switch(config-if)#no shutdown Switch(config-if)#interface vlan 20 Switch(config-if)#ip address 192.168.20.1 255.255.255.0 Switch(config-if)#no shutdown Switch(config-if)#exit Switch(config)#ip routing Switch(config)#exit Switch#copy running start

在 pc2 ping测试

查看路由，命令show  ip route

3 排查VLAN间路由故障

3.1 交换机配置问题

VLAN分配不正确及接入模式不正确

校验

S#show interfaces FastEthernet0/0  switchport

S#show runn

3.2 路由器配置问题

3.3 IP 编址问题