Cisco-DHCP中继实验案例
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此实验使用Cisco Packet Tracer制作
Cisco-三层VLAN+DHCP实验案例
说明：某公司有三个部门，划分三个VLAN进行隔离，IP地址通过vlan40中的DHCP服务器进行下发，保证各个部门的主机获取到IP地址，通过三层交换机的路由访问外部网络。
IP地址规划表
设备
| 接口
| 地址
|
Switch31
| VLAN 10
| 192.168.10.254/24
|
Switch31
| VLAN 20
| 192.168.20.254/24
|
Switch31
| VLAN 30
| 192.168.30.254/24
|
Switch31
| VLAN 40
| 192.168.40.254/24
|
Switch31
| FastEthernet0/4
| 200.100.10.1/30
|
R1
| GigabitEthernet0/0
| 200.100.20.1/24
|
R1
| GigabitEthernet0/1
| 200.100.10.2/30
|
DHCP-Server
| FastEthernet0
| 192.168.40.1/24
|
PC0
| FastEthernet0
| 200.100.20.1/24
|
PC1-3
| FastEthernet0
| DHCP获取
|
PC4-6
| FastEthernet0
| DHCP获取
|
PC7-9
| FastEthernet0
| DHCP获取
|
接口规划表
本端设备
| 接口
| 端口类型
| 对端设备
| 接口
|
Switch31
| FastEthernet0/1
| Trunk
| Switch0
| FastEthernet0/4
|
Switch31
| FastEthernet0/2
| Trunk
| Switch1
| FastEthernet0/4
|
Switch31
| FastEthernet0/3
| Trunk
| Switch2
| FastEthernet0/4
|
Switch31
| FastEthernet0/4
| Access
| DHCP-Server
| FastEthernet0
|
Switch31
| FastEthernet0/5
| | R1
| GigabitEthernet0/1
|
R1
| GigabitEthernet0/0
| | PC0
| FastEthernet0
|
Switch0
| FastEthernet0/1
| Access
| PC1
| FastEthernet0
|
Switch0
| FastEthernet0/2
| Access
| PC2
| FastEthernet0
|
Switch0
| FastEthernet0/3
| Access
| PC3
| FastEthernet0
|
Switch1
| FastEthernet0/1
| Access
| PC4
| FastEthernet0
|
Switch1
| FastEthernet0/1
| Access
| PC5
| FastEthernet0
|
Switch1
| FastEthernet0/1
| Access
| PC6
| FastEthernet0
|
Switch2
| FastEthernet0/1
| Access
| PC7
| FastEthernet0
|
Switch2
| FastEthernet0/1
| Access
| PC8
| FastEthernet0
|
Switch2
| FastEthernet0/1
| Access
| PC9
| FastEthernet0
|
项目实施
一、配置各接口所属VLAN和地址
#Switch31的配置
Switch31(config)#vlan 10
Switch31(config-vlan)#vlan 20
Switch31(config-vlan)#vlan 30
!
Switch31(config)interface FastEthernet0/1
Switch31(config-if)switchport mode trunk
Switch31(config-if)#switchport trunk allowed vlan 10
!
Switch31(config)interface FastEthernet0/2
Switch31(config-if)switchport mode trunk
Switch31(config-if)#switchport trunk allowed vlan 20
!
Switch31(config)interface FastEthernet0/3
Switch31(config-if)switchport mode trunk
Switch31(config-if)#switchport trunk allowed vlan 30
!
Switch31(config)interface FastEthernet0/4
Switch31(config-if)#no switchport
Switch31(config-if)#ip address 200.100.10.1 255.255.255.0
!
Switch31(config)interface FastEthernet0/5
Switch31(config-if)switchport mode access
Switch31(config-if)#switchport access vlan 40
!
Switch31(config)#int vlan 10
Switch31(config-if)#ip address 192.168.10.254 255.255.255.0
!
Switch31(config)#int vlan 20
Switch31(config-if)#ip address 192.168.20.254 255.255.255.0
!
Switch31(config)#int vlan 30
Switch31(config-if)#ip address 192.168.30.254 255.255.255.0
!
Switch31(config)#int vlan 40
Switch31(config-if)#ip address 192.168.40.254 255.255.255.0
R1的配置
Router1(config)#interface GigabitEthernet0/0
Router1(config-if)#ip address 200.100.20.1 255.255.255.0
!
Router1(config)#interface GigabitEthernet0/1
Router1(config-if)#ip address 200.100.10.2 255.255.255.0
Switch1的配置
Switch0(config)#vlan 10
Switch0(config-vlan)#exit
!
Switch0(config)#interface FastEthernet0/4
Switch0(config-if)#switchport mode trunk
Switch0(config-if)#switchport trunk allowed vlan 10
!
Switch0(config)#interface range fa0/1 - fa0/3
Switch0(config-if-range)#switchport mode access
Switch0(config-if-range)#switchport access vlan 10
Switch2的配置
Switch0(config)#vlan 20
Switch0(config-vlan)#exit
!
Switch0(config)#interface FastEthernet0/4
Switch0(config-if)#switchport mode trunk
Switch0(config-if)#switchport trunk allowed vlan 20
!
Switch0(config)#interface range fa0/1 - fa0/3
Switch0(config-if-range)#switchport mode access
Switch0(config-if-range)#switchport access vlan 20
Switch3的配置
Switch0(config)#vlan 30
Switch0(config-vlan)#exit
!
Switch0(config)#interface FastEthernet0/4
Switch0(config-if)#switchport mode trunk
Switch0(config-if)#switchport trunk allowed vlan 30
!
Switch0(config)#interface range fa0/1 - fa0/3
Switch0(config-if-range)#switchport mode access
Switch0(config-if-range)#switchport access vlan 30
二、配置DHCP服务器
翻译乃个人理解，并非纯翻译！！！
三、配置DHCP中继
此拓扑中DHCP中继的作用是为了实现在不同子网中实现转发DHCP信息的功能。
#Switch31的配置
Switch31(config)#int vlan 10
Switch31(config-if)#ip address 192.168.10.254 255.255.255.0
Switch31(config-if)#ip helper-address 192.168.40.1
!
Switch31(config)#int vlan 20
Switch31(config-if)#ip address192.168.20.254 255.255.255.0
Switch31(config-if)#ip helper-address 192.168.40.1
!
Switch31(config)#int vlan 30
Switch31(config-if)#ip address 192.168.30.254 255.255.255.0
Switch31(config-if)#ip helper-address 192.168.40.1
四、配置路由实现内部网络访问外部网络
#Switch31的配置
Switch31(config)#ip route 0.0.0.0 0.0.0.0 200.100.10.2
R1的配置
Router1(config)#ip route 192.168.0.0 255.255.0.0 200.100.10.1
项目效果
VLAN 10内DHCP下发地址的效果
VLAN 20内地址下发的效果
VLAN 30内DHCP下发地址的效果
DHCP中继效果
路由的效果
