Cisco DHCP中继服务
SW2交换机配置
Switch>enable
Switch#conf terminal
Switch(config)#hostname SW2
SW2(config)#vlan 2
SW2(config-vlan)#exit
SW2(config)#vlan 3
SW2(config-vlan)#exit
SW2(config)#interface f0/3
SW2(config-if)#switchport mode access
SW2(config-if)#switchport access vlan 2
SW2(config-if)#exit
SW2(config)#interface f0/2
SW2(config-if)#switchport mode access
SW2(config-if)#switchport access vlan 3
SW2(config-if)#exit
SW2(config)#interface f0/4
SW2(config-if)#switchport mode trunk
SW2(config-if)#end
SW2#show vlan brief
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/5, Fa0/6, Fa0/7
Fa0/8, Fa0/9, Fa0/10, Fa0/11
Fa0/12, Fa0/13, Fa0/14, Fa0/15
Fa0/16, Fa0/17, Fa0/18, Fa0/19
Fa0/20, Fa0/21, Fa0/22, Fa0/23
Fa0/24
2 VLAN0002 active Fa0/3
3 VLAN0003 active Fa0/2
F0/4不在vlan1中，所有trunk添加成功
SW3三层交换配置DHCP中继
Switch>enable
Switch#conf terminal
Switch(config)#hostname SW3
SW3(config)#ip routing #开启三层交换的路由功能
SW3(config)#interface f0/1
SW3(config-if)#switchport mode trunk
SW3(config-if)#end
SW3#show interfaces f0/1 switchport
Name: Fa0/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
SW3#conf terminal
SW3(config)#vlan 2
SW3(config-vlan)#exit
SW3(config)#vlan 3
SW3(config-vlan)#exit
SW3(config)#interface vlan 1
SW3(config-if)#ip address 192.168.1.1 255.255.255.0
SW3(config-if)#ip helper-address 192.168.2.100 #DHCP中继
SW3(config-if)#no shutdown
SW3(config-if)#exit
SW3(config)#interface vlan 2
SW3(config-if)#ip address 192.168.2.1 00 255.255.255.0
SW3(config-if)#no shutdown
SW3(config-if)#exit
SW3(config)#interface vlan 3
SW3(config-if)#ip address 192.168.3.1 255.255.255.0
SW3(config-if)#ip helper-address 192.168.2.100 #DHCP中继
SW3(config-if)#no shutdown
SW3(config-if)#exit
SW3(config)#interface f0/2
SW3(config-if)#no switchport
SW3(config-if)#ip address 192.168.4.1 255.255.255.0
SW3(config-if)#no shutdown