華三交換機路由器如何配置dhcp中繼（dhcp relay）

具體環境如上圖，內網有專門的dhcp服務器（此處用華三路由器代替）連接到核心交換機，核心交換機做dhcp中繼，給下面用戶分配ip。

一，dhcp服務端配置。

配置路由器接口地址

[R_DHCP]interface GigabitEthernet 02

[R_DHCP-GigabitEthernet0/2]ip address 192.168.0.1 24

使能dhcp

[R_DHCP]dhcp enable

配置dhcp地址池

[R_DHCP]dhcp server ip-pool vlan10

[R_DHCP-dhcp-pool-vlan10]network 192.168.10.0 mask 255.255.255.0 //配置dhcp網段

[R_DHCP-dhcp-pool-vlan10]gateway-list 192.168.10.1 //配置網關地址

[R_DHCP-dhcp-pool-vlan10]dns-list 192.168.10.1 //配置dns服務器地址

[R_DHCP-dhcp-pool-vlan10]expired day 0 hour 10 //配置租期

[R_DHCP-dhcp-pool-vlan10]forbidden-ip 192.168.10.1 //配置排除地址

配置dhcp服務器到內網192.168.10.0/24的靜態路由，保證網絡互通

[R_DHCP]ip route-static 192.168.10.0 24 192.168.0.2

二，配置交換機

配置交換機上聯路由器接口和地址

[SW1]vlan 100

[SW1]interface vlan 100

[SW1-Vlan-interface100]ip add 192.168.0.2 24

[SW1-Vlan-interface100]quit

[SW1]interface GigabitEthernet 1/0/2

[SW1-GigabitEthernet1/0/2]port link-type access

[SW1-GigabitEthernet1/0/2]port access vlan 100

配置交換機下聯內網的接口和地址

[SW1]vlan 10

[SW1-vlan10]interface GigabitEthernet 1/0/1

[SW1-GigabitEthernet1/0/1]port link-type access

[SW1-GigabitEthernet1/0/1]port access vlan 10

[SW1-GigabitEthernet1/0/1]qu

[SW1]interface vlan 10

[SW1-Vlan-interface10]ip address 192.168.10.1 24

[SW1-Vlan-interface10]dhcp select relay //設置接口工作在dhcp中繼模式，（缺省接口工作在dhcp服務器模式下）

[SW1-Vlan-interface10]dhcp relay server-address 192.168.0.1 //設置接口中繼的dhcp服務器的地址

使能dhcp

[SW1]dhcp enable

添加缺省靜態路由，保證和dhcp服務器網絡互通

[SW1]ip route-static 0.0.0.0 192.168.0.1

三，在dhcp服務器的路由器上查看dhcp分配情況

display dhcp server ip-in-use

使用命令查看dhcp服務器的統計信息。display dhcp server statistics

在中繼交換機上查看中繼統計信息，display dhcp relay statistics