华三交换机路由器如何配置dhcp中继（dhcp relay）

具体环境如上图，内网有专门的dhcp服务器（此处用华三路由器代替）连接到核心交换机，核心交换机做dhcp中继，给下面用户分配ip。

一，dhcp服务端配置。

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网段

[R_DHCP-dhcp-pool-vlan10]gateway-list 192.168.10.1 //配置网关地址

[R_DHCP-dhcp-pool-vlan10]dns-list 192.168.10.1 //配置dns服务器地址

[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服务器到内网192.168.10.0/24的静态路由，保证网络互通

[R_DHCP]ip route-static 192.168.10.0 24 192.168.0.2

二，配置交换机

配置交换机上联路由器接口和地址

[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

配置交换机下联内网的接口和地址

[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 //设置接口工作在dhcp中继模式，（缺省接口工作在dhcp服务器模式下）

[SW1-Vlan-interface10]dhcp relay server-address 192.168.0.1 //设置接口中继的dhcp服务器的地址

使能dhcp

[SW1]dhcp enable

添加缺省静态路由，保证和dhcp服务器网络互通

[SW1]ip route-static 0.0.0.0 192.168.0.1

三，在dhcp服务器的路由器上查看dhcp分配情况

display dhcp server ip-in-use

使用命令查看dhcp服务器的统计信息。display dhcp server statistics

在中继交换机上查看中继统计信息，display dhcp relay statistics