DHCP+VLAN多网段综合实验

拓扑图如下：

 设备配置如下： SW:SW#sh runBuilding configuration...Current configuration : 1538 bytes!version 12.2no service timestamps log datetime msecno service timestamps debug datetime msecno service password-encryption!hostname Switch!!!!!ip routing!!!!!!!!!!spanning-tree mode pvst!!!!interface FastEthernet0/1 switchport trunk encapsulation dot1q switchport mode trunk!interface FastEthernet0/2 switchport trunk encapsulation dot1q switchport mode trunk!interface FastEthernet0/3 switchport trunk encapsulation dot1q switchport mode trunk!interface FastEthernet0/4 switchport trunk encapsulation dot1q switchport mode trunk!interface FastEthernet0/5!interface FastEthernet0/6!interface FastEthernet0/7!interface FastEthernet0/8!interface FastEthernet0/9!interface FastEthernet0/10!interface FastEthernet0/11!interface FastEthernet0/12!interface FastEthernet0/13!interface FastEthernet0/14!interface FastEthernet0/15!interface FastEthernet0/16!interface FastEthernet0/17!interface FastEthernet0/18!interface FastEthernet0/19!interface FastEthernet0/20!interface FastEthernet0/21!interface FastEthernet0/22!interface FastEthernet0/23!interface FastEthernet0/24!interface GigabitEthernet0/1!interface GigabitEthernet0/2!interface Vlan1 ip address 192.168.0.254 255.255.255.0!interface Vlan10 ip address 192.168.10.254 255.255.255.0 ip helper-address 192.168.0.20!interface Vlan20 ip address 192.168.20.254 255.255.255.0 ip helper-address 192.168.0.20!ip classless!!!!!!!line con 0!line aux 0!line vty 0 4 login!!!endSW# ------------------------------------------------------------------------------------------------------------------------------------------------------------------------SW1： SW1#show run Building configuration...Current configuration : 1809 bytes!version 12.1no service timestamps log datetime msecno service timestamps debug datetime msecno service password-encryption!hostname SW1!!spanning-tree mode pvst!interface FastEthernet0/1 switchport mode trunk!interface FastEthernet0/2 switchport access vlan 10!interface FastEthernet0/3 switchport access vlan 10!interface FastEthernet0/4 switchport access vlan 10!interface FastEthernet0/5 switchport access vlan 10!interface FastEthernet0/6 switchport access vlan 10!interface FastEthernet0/7 switchport access vlan 10!interface FastEthernet0/8 switchport access vlan 10!interface FastEthernet0/9 switchport access vlan 10!interface FastEthernet0/10 switchport access vlan 10!interface FastEthernet0/11 switchport access vlan 10!interface FastEthernet0/12 switchport access vlan 10!interface FastEthernet0/13 switchport access vlan 20!interface FastEthernet0/14 switchport access vlan 20!interface FastEthernet0/15 switchport access vlan 20!interface FastEthernet0/16 switchport access vlan 20!interface FastEthernet0/17 switchport access vlan 20!interface FastEthernet0/18 switchport access vlan 20!interface FastEthernet0/19 switchport access vlan 20!interface FastEthernet0/20 switchport access vlan 20!interface FastEthernet0/21 switchport access vlan 20!interface FastEthernet0/22 switchport access vlan 20!interface FastEthernet0/23 switchport access vlan 20!interface FastEthernet0/24 switchport access vlan 20!interface GigabitEthernet1/1!interface GigabitEthernet1/2!interface Vlan1 no ip address!interface Vlan10 no ip address!interface Vlan20 no ip address!!line con 0!line vty 0 4 loginline vty 5 15 login!!endSW1#----------------------------------------------------------------------------------------------------------------------------------------------------------------------- SW2： SW2#SH RUNBuilding configuration...Current configuration : 1742 bytes!version 12.1no service timestamps log datetime msecno service timestamps debug datetime msecno service password-encryption!hostname SW2!!spanning-tree mode pvst!interface FastEthernet0/1 switchport mode trunk!interface FastEthernet0/2 switchport access vlan 10!interface FastEthernet0/3 switchport access vlan 10!interface FastEthernet0/4 switchport access vlan 10!interface FastEthernet0/5 switchport access vlan 10!interface FastEthernet0/6 switchport access vlan 10!interface FastEthernet0/7 switchport access vlan 10!interface FastEthernet0/8 switchport access vlan 10!interface FastEthernet0/9 switchport access vlan 10!interface FastEthernet0/10 switchport access vlan 10!interface FastEthernet0/11 switchport access vlan 10!interface FastEthernet0/12 switchport access vlan 10!interface FastEthernet0/13 switchport access vlan 20!interface FastEthernet0/14 switchport access vlan 20!interface FastEthernet0/15 switchport access vlan 20!interface FastEthernet0/16 switchport access vlan 20!interface FastEthernet0/17 switchport access vlan 20!interface FastEthernet0/18 switchport access vlan 20!interface FastEthernet0/19 switchport access vlan 20!interface FastEthernet0/20 switchport access vlan 20!interface FastEthernet0/21 switchport access vlan 20!interface FastEthernet0/22 switchport access vlan 20!interface FastEthernet0/23 switchport access vlan 20!interface FastEthernet0/24 switchport access vlan 20!interface GigabitEthernet1/1!interface GigabitEthernet1/2!interface Vlan1 no ip address shutdown!interface Vlan10 no ip address!interface Vlan20 no ip address!!line con 0!line vty 0 4 loginline vty 5 15 login!!endSW2#----------------------------------------------------------------------------------------------------------------------------------------------------------------------- 注意：DHCP DISCOVER 是以广播方式进行的，其情形只能在同一网段之内进行，因为路由器是不会将二层广播包转发出去的。需配置DHCP中继代理（ip helper-address）