DHCP+VLAN multi-segment comprehensive experiment
The topology diagram is as follows:
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#-------------------------------------------------------------------------------------------------------------------------------------------------------------------Note: DHCP DISCOVER is broadcast, and its situation can only be carried out within the same network segment, because routers will not forward Layer 2 broadcast packets. DHCP relay agent (ip helper-address) is required
