DHCP配置參數說明】

實驗拓撲搭建

從DHCP自動獲取IP地址的方法：

• 1、創建DHCP地址池
• 2、在端口下創建接口DHCP

在端口下創建接口DHCP：

SW1配置參數

[SW1]vlan batch 10 20 [SW1]interface Ethernet0/0/1 [SW1-Ethernet0/0/1]display this # interface Ethernet0/0/1port link-type accessport default vlan 10 # return [SW1-Ethernet0/0/1]quit[SW1]interface Ethernet0/0/2 [SW1-Ethernet0/0/2]dis thi # interface Ethernet0/0/2port link-type accessport default vlan 20 # return [SW1-Ethernet0/0/2]quit[SW1]interface GigabitEthernet 0/0/1 [SW1-GigabitEthernet0/0/1]dis thi # interface GigabitEthernet0/0/1port link-type trunkundo port trunk allow-pass vlan 1port trunk allow-pass vlan 10 20 # return [SW1-GigabitEthernet0/0/1]

AR1參數配置

[AR1]dhcp enable //全局開啟DHCP服務 [AR1]interface GigabitEthernet 0/0/0.1 [AR1-GigabitEthernet0/0/0.1]display this [V200R003C00] # interface GigabitEthernet0/0/0.1dot1q termination vid 10ip address 10.1.1.254 255.255.255.0 arp broadcast enabledhcp select interface //開啟接口DHCP服務功能dhcp server excluded-ip-address 10.1.1.1 //排除DHCP自動獲取的IP地址 （排除服務器IP地址、網關IP地址）dhcp server lease day 2 hour 2 minute 2 //設置DHCP最少租用時間（租約時間）dhcp server dns-list 202.99.192.68 （獲取DNS，網關，網段） # return [AR1-GigabitEthernet0/0/0.1]quit[AR1]interface GigabitEthernet 0/0/0.2 [AR1-GigabitEthernet0/0/0.2]display this [V200R003C00] # interface GigabitEthernet0/0/0.2dot1q termination vid 20ip address 20.1.1.254 255.255.255.0 arp broadcast enabledhcp select interfacedhcp server excluded-ip-address 20.1.1.1 dhcp server lease day 2 hour 2 minute 2 dhcp server dns-list 202.99.192.68 # return [AR1-GigabitEthernet0/0/0.2]

Pc1從接口DHCP自動獲取IP地址的數據報文過程

創建全局DHCP（創建DHCP地址池）

AR1參數配置及說明

[AR1]dhcp enable //使能DHCP功能，在配置DHCP服務器時必須先執行該命令，才能配置DHCP的其他功能并生效 [AR1]ip pool IT //設置一個名為IT的全局地址池 Info: It's successful to create an IP address pool. [AR1-ip-pool-IT]gateway-list 10.1.1.254 //設置分配的網關IP [AR1-ip-pool-IT]network 10.1.1.0 mask 255.255.255.0 //設置分配的地址網段 [AR1-ip-pool-IT]excluded-ip-address 10.1.1.253 //設置不參與自動分配的IP地址范圍 [AR1-ip-pool-IT]lease day 2 hour 2 minute 2 //設置地址池中的租用有效期限，默認為1天 [AR1-ip-pool-IT]dns-list 202.99.99.99 //設置分配的DNS服務器地址 [AR1-ip-pool-IT]display this [V200R003C00] # ip pool ITgateway-list 10.1.1.254 network 10.1.1.0 mask 255.255.255.0 excluded-ip-address 10.1.1.253lease day 2 hour 2 minute 2 dns-list 202.99.99.99 # return [AR1-ip-pool-IT]quit[AR1]ip pool HR [AR1-ip-pool-HR]dis thi [V200R003C00] # ip pool HRgateway-list 20.1.1.254 network 20.1.1.0 mask 255.255.255.0 excluded-ip-address 20.1.1.253lease day 2 hour 2 minute 2 dns-list 202.99.99.99 # return [AR1-ip-pool-HR]quit[AR1]interface GigabitEthernet 0/0/0.1 [AR1-GigabitEthernet0/0/0.1]dhcp select global //接口下使能全局方式分配地址 Warning: There are IP addresses allocated in the pool. Are you sure to delete the pool?[Y/N]:y [AR1-GigabitEthernet0/0/0.1]dis thi [V200R003C00] # interface GigabitEthernet0/0/0.1dot1q termination vid 10ip address 10.1.1.254 255.255.255.0 arp broadcast enabledhcp select global # return [AR1-GigabitEthernet0/0/0.1]quit[AR1]interface GigabitEthernet 0/0/0.2 [AR1-GigabitEthernet0/0/0.2]dhcp select global //接口下使能全局方式分配地址 Warning: There are IP addresses allocated in the pool. Are you sure to delete the pool?[Y/N]:y [AR1-GigabitEthernet0/0/0.2]display this [V200R003C00] # interface GigabitEthernet0/0/0.2dot1q termination vid 20ip address 20.1.1.254 255.255.255.0 arp broadcast enabledhcp select global # return [AR1-GigabitEthernet0/0/0.2]quit

補充說明：當DHCP在全局下和接口下同時存在的時候，DHCP接口優先于全局

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