Cisco：DHCP自动获取IP地址_思科dhcp自动获取ip地址

Cisco：DHCP实现自动获取IP地址

局域网网络协议，用于管理和分配IP地址，使用UDP协议工作，常用的端口是67（server），68（client）

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拓扑图：

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一：SW0，sw1二层交换机的配置

1：为sw0，sw1划分vlan，sw0为vlan10，sw1为vlan20.

SW0

Switch>en
Switch#config terminal
Enter configuration commands, one per line.  End with CNTL/Z.
SW0(config)#vlan 10 
SW0(config-vlan)#interface vlan 10
SW0(config-if)#
%LINK-5-CHANGED: Interface Vlan10, changed state to up

SW0(config)#interface f0/1
SW0(config-if)#switchport mode access 
SW0(config-if)#switchport access vlan 10
SW0(config-if)#interface g0/1
SW0(config-if)#switchport mode trunk 
SW0(config-if)#switchport trunk allowed vlan 10,20
SW0(config-if)#exit
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SW1

Switch>en
Switch#config terminal
Enter configuration commands, one per line.  End with CNTL/Z.
SW1(config)#vlan 20
SW1(config-vlan)#interface vlan 20
SW1(config-if)#
%LINK-5-CHANGED: Interface Vlan10, changed state to up

SW1(config)#interface f0/1
SW1(config-if)#switchport mode access 
SW1(config-if)#switchport access vlan 20
SW1(config-if)#interface f0/2
SW1(config-if)#switchport mode trunk 
SW1(config-if)#switchport trunk allowed vlan 10,20
SW1(config-if)#exit
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三层交换机

//进入特权模式
Switch(config)#vlan 10
Switch(config-vlan)#interface vlan 10
Switch(config-if)#ip address 192.168.1.1 255.255.255.0
Switch(config-if)#exit
Switch(config)#vlan 20
Switch(config-vlan)#interface vlan 20
Switch(config-if)#ip address 192.168.2.1 255.255.255.0

Switch(config)#interface g0/1
Switch(config-if)#no shutdown
Switch(config-if)#switchport mode trunk 
Switch(config-if)#switchport trunk allowed vlan 10,20
Switch(config-if)#switchport trunk encapsulation dot1q 
Switch(config-if)#no shutdown 

Switch(config-if)#interface f0/2
Switch(config-if)#switchport mode trunk 
Switch(config-if)#switchport trunk allowed vlan 10,20
Switch(config-if)#switchport trunk encapsulation dot1q 
Switch(config-if)#no shutdown 

Switch(config)#ip routing //开启路由功能
Switch(config)#ip dhcp pool wsy  //地址池为wsy
Switch(dhcp-config)#network 192.168.10.0 255.255.255.0 //宣告网络
Switch(dhcp-config)#default-router 192.168.10.2 //设置默认路由
Switch(dhcp-config)#dns-server 8.8.8.8 //设置一个dns服务IP
Switch(dhcp-config)#exit 
Switch(config)#ip route 192.168.10.0 255.255.255.0 192.168.20.2 //下一跳就去服务器
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路由器

Router>en
Router#configure terminal 
Router(config)#interface gigabitEthernet 0/0/0 
Router(config-if)#ip address 192.168.20.2 255.255.255.0
Router(config-if)#no shutdown 

Router(config-if)#interface g0/0/1
Router(config-if)#ip address 192.168.10.2 255.255.255.0

Router(config-if)#no shutdown 
Router(config)#ip route 192.168.1.0 255.255.255.0 192.168.20.1
Router(config)#ip route 192.168.2.0 255.255.255.0 192.168.20.1
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服务器

为服务器配置好DHCP

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总结