switch 0上配置：
vlan 10
exit
interface range f0/1-2
switchport access vlan 10
exit
interface gigabitEthernet 1/1
switchport trunk allowed vlan all 允许所有VLAN通过
exit
interface gigabitEthernet 1/1
switchport mode trunk 配置该接口为trunk模式
exit
switch 1上配置：
vlan 20
exit
interface range f0/1-2
switchport access vlan 20
exit
interface gigabitEthernet 1/1
switchport trunk allowed vlan all 允许所有VLAN通过
exit
interface gigabitEthernet 1/1
switchport mode trunk
exit
核心交换配置：
vlan 10
exit
vlan 20
exit
interface fastEthernet f0/1
switchport trunk allowed vlan all 允许所有VLAN通过
switchport mode trunk
exit
interface fastEthernet f0/2
switchport trunk allowed vlan all 允许所有VLAN通过
switchport mode trunk
exit
ip routing 开启路由功能
interface vlan 10
ip address 192.168.1.1 255.255.255.0 配置模式虚拟端口
exit
interface vlan 20
ip address 192.168.2.1 255.255.255.0 配置模式虚拟端口
exit
service dhcp
ip dhcp pool 10
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server x.x.x.x
ip dhcp pool 20
network 192.168.2.0 255.255.255.0
default-router 192.168.2.1
dns-server x.x.x.x
客户机查看IP获取情况
