1.DHCP 实例配置

## 配置步骤(在路由器上配置)### (1)  # 配置接口的 IP 地址。
    
      system-view[H3C] interface g 0/0[[H3C-GigabitEthernet0/0]] ip address 192.168.1.254 24[[H3C-GigabitEthernet0/0]] quit### (2)# 启用 DHCP 服务。[H3C] dhcp enable### (3)  # 配置不参与自动分配的 IP 地址。[H3C] dhcp server forbidden-ip 192.168.1.10[H3C] dhcp server forbidden-ip 192.168.1.254(4)# 配置 DHCP 地址池 0，采用动态绑定方式分配 IP 地址。可分配的网段为 192.168.1.0/24，租约有效期限为 10 天，DNS 服务器地址为 192.168.1.10。[H3C] dhcp server ip-pool 0[H3C-dhcp-pool-0] network 192.168.1.0 mask 255.255.255.0[H3C-dhcp-pool-0] expired day 10[H3C-dhcp-pool-0] dns-list 192.168.1.10[H3C-dhcp-pool-0] gateway-list 192.168.1.254[H3C-dhcp-pool-0] quit
    

2.DHCP中继

DHCP服务器在路由器上，而SWA上有3个VLAN，分属于3个不同网段，

DHCP的请求报文是广播，因此必须在SWA上设置中继才能够传到路由器。

配置步骤(1)  # 配置路由器。
    
      system-view[H3C] interface g 0/0[[H3C-GigabitEthernet0/0]] ip address 10.1.1.2 30[[H3C-GigabitEthernet0/0]] quit # 启用 DHCP 服务。[H3C] dhcp enable# 配置 DHCP 地址池 1，为来自 192.168.1.0/24网段内的客户端分配地址。[H3C] dhcp server ip-pool 1[H3C-dhcp-pool-0] network 192.168.10.0 mask 255.255.255.0[H3C-dhcp-pool-0] dns-list 8.8.8.8[H3C-dhcp-pool-0] gateway-list 192.168.10.254[H3C-dhcp-pool-0] quit# 配置 DHCP 地址池 2，为来自 192.168.20.0/24网段内的客户端分配地址。[H3C] dhcp server ip-pool 2[H3C-dhcp-pool-0] network 192.168.20.0 mask 255.255.255.0[H3C-dhcp-pool-0] dns-list 8.8.8.8[H3C-dhcp-pool-0] gateway-list 192.168.20.254[H3C-dhcp-pool-0] quit# 配置 DHCP 地址池 3，为来自 192.168.30.0/24网段内的客户端分配地址。[H3C] dhcp server ip-pool 3[H3C-dhcp-pool-0] network 192.168.30.0 mask 255.255.255.0[H3C-dhcp-pool-0] dns-list 8.8.8.8[H3C-dhcp-pool-0] gateway-list 192.168.30.254[H3C-dhcp-pool-0] quit# 配置静态路由到192.168.0.0/16网段[H3C]ip route-static 192.168.0.0 16 10.1.1.1
    

(2)# 配置 SWA交换机。

建立vlan，并且配置各接口的 IP 地址。

    
      system-view[H3C]vlan 10[H3C-vlan10]quit[H3C]vlan 20[H3C-vlan20]quit[H3C]vlan 30[H3C-vlan30]quit[H3C]inter range g 1/0/1 to g 1/0/5[H3C-if-range]port link-type access[H3C-if-range]port access vlan 10[H3C-if-range]quit[H3C]inter range g 1/0/6 to g 1/0/10[H3C-if-range]port link-type access[H3C-if-range]port access vlan 20[H3C-if-range]quit[H3C]inter range g 1/0/11 to g 1/0/15[H3C-if-range]port link-type access[H3C-if-range]port access vlan 30[H3C-if-range]quit[H3C]inter vlan 10[H3C-Vlan-interface10]ip add 192.168.10.254 24[H3C-Vlan-interface10]quit[H3C]inter vlan 20[H3C-Vlan-interface20]ip add 192.168.20.254 24[H3C-Vlan-interface20]quit[H3C]inter vlan 30[H3C-Vlan-interface30]ip add 192.168.30.254 24[H3C-Vlan-interface30]quit[H3C][H3C]inter g 1/0/23[H3C-GigabitEthernet1/0/23]port link-m r[H3C-GigabitEthernet1/0/23]ip add 10.1.1.1 30[H3C-GigabitEthernet1/0/23]quit
    

(3)#配置DHCP中继（SWA交换机）

# 启用 DHCP 服务。[H3C] dhcp enable# 配置 VLAN 接口 10 工作在 DHCP 中继模式。[H3C] interface vlan-interface 10[H3C-Vlan-interface10] dhcp select relay# 配置 DHCP 服务器的地址。[H3C-Vlan-interface10] dhcp relay server-address 10.1.1.2[H3C-Vlan-interface10] quit# 配置 VLAN 接口 20 工作在 DHCP 中继模式。[H3C] interface vlan-interface 20[H3C-Vlan-interface20] dhcp select relay[H3C-Vlan-interface20] dhcp relay server-address 10.1.1.2[H3C-Vlan-interface20] quit# 配置 VLAN 接口 30 工作在 DHCP 中继模式。[H3C] interface vlan-interface 30[H3C-Vlan-interface30] dhcp select relay[H3C-Vlan-interface30] dhcp relay server-address 10.1.1.2[H3C-Vlan-interface30] quit

3.DHCP Snooping

DHCP服务器在路由器上，而SWA上有3个VLAN，分属于3个不同网段，

DHCP的请求报文是广播，因此必须在SWA上设置中继才能够传到路由器。

伪DHCP Server已经配置好，将发布172.22.1.1-99的地址池，网关172.22.1.254，DNS 9.9.9.9

配置步骤

(1)  # 配置路由器。
    
      system-view[H3C] interface g 0/0[[H3C-GigabitEthernet0/0]] ip address 10.1.1.2 30[[H3C-GigabitEthernet0/0]] quit # 启用 DHCP 服务。[H3C] dhcp enable# 配置 DHCP 地址池 1，为来自 192.168.1.0/24网段内的客户端分配地址。[H3C] dhcp server ip-pool 1[H3C-dhcp-pool-0] network 192.168.10.0 mask 255.255.255.0[H3C-dhcp-pool-0] dns-list 8.8.8.8[H3C-dhcp-pool-0] gateway-list 192.168.10.254[H3C-dhcp-pool-0] quit# 配置 DHCP 地址池 2，为来自 192.168.20.0/24网段内的客户端分配地址。[H3C] dhcp server ip-pool 2[H3C-dhcp-pool-0] network 192.168.20.0 mask 255.255.255.0[H3C-dhcp-pool-0] dns-list 8.8.8.8[H3C-dhcp-pool-0] gateway-list 192.168.20.254[H3C-dhcp-pool-0] quit# 配置 DHCP 地址池 3，为来自 192.168.30.0/24网段内的客户端分配地址。[H3C] dhcp server ip-pool 3[H3C-dhcp-pool-0] network 192.168.30.0 mask 255.255.255.0[H3C-dhcp-pool-0] dns-list 8.8.8.8[H3C-dhcp-pool-0] gateway-list 192.168.30.254[H3C-dhcp-pool-0] quit# 配置静态路由到192.168.0.0/16网段[H3C]ip route-static 192.168.0.0 16 10.1.1.1
    

(2)# 配置 SWA交换机。# 建立vlan，并且配置各接口的 IP 地址。
    
      system-view[H3C]vlan 10[H3C-vlan10]quit[H3C]vlan 20[H3C-vlan20]quit[H3C]vlan 30[H3C-vlan30]quit[H3C]inter range g 1/0/1 to g 1/0/5[H3C-if-range]port link-type access[H3C-if-range]port access vlan 10[H3C-if-range]quit[H3C]inter range g 1/0/6 to g 1/0/10[H3C-if-range]port link-type access[H3C-if-range]port access vlan 20[H3C-if-range]quit[H3C]inter range g 1/0/11 to g 1/0/15[H3C-if-range]port link-type access[H3C-if-range]port access vlan 30[H3C-if-range]quit[H3C]inter vlan 10[H3C-Vlan-interface10]ip add 192.168.10.254 24[H3C-Vlan-interface10]quit[H3C]inter vlan 20[H3C-Vlan-interface20]ip add 192.168.20.254 24[H3C-Vlan-interface20]quit[H3C]inter vlan 30[H3C-Vlan-interface30]ip add 192.168.30.254 24[H3C-Vlan-interface30]quit[H3C][H3C]inter g 1/0/23[H3C-GigabitEthernet1/0/23]port link-t[H3C-GigabitEthernet1/0/23]ip add 10.1.1.1 30[H3C-GigabitEthernet1/0/23]quit
    

(3)#配置DHCP中继（SWA交换机）# 启用 DHCP 服务。[H3C] dhcp enable# 配置 VLAN 接口 10 工作在 DHCP 中继模式。[H3C] interface vlan-interface 10[H3C-Vlan-interface10] dhcp select relay# 配置 DHCP 服务器的地址。[H3C-Vlan-interface10] dhcp relay server-address 10.1.1.2[H3C-Vlan-interface10] quit# 配置 VLAN 接口 20 工作在 DHCP 中继模式。[H3C] interface vlan-interface 20[H3C-Vlan-interface20] dhcp select relay[H3C-Vlan-interface20] dhcp relay server-address 10.1.1.2[H3C-Vlan-interface20] quit# 配置 VLAN 接口 30 工作在 DHCP 中继模式。[H3C] interface vlan-interface 30[H3C-Vlan-interface30] dhcp select relay[H3C-Vlan-interface30] dhcp relay server-address 10.1.1.2[H3C-Vlan-interface30] quit

(4)#配置DHCP Snooping（SWB交换机）# 启用 DHCP Snooping 功能。[H3C] dhcp snooping enable# 设置 GigabitEthernet1/0/21 端口为信任端口。[H3C] interface GigabitEthernet 1/0/21[H3C-GigabitEthernet1/0/21] dhcp snooping trust[H3C-GigabitEthernet1/0/21] quit# 在 GigabitEthernet1/0/1 上启用 DHCP Snooping 表项功能。[H3C] interface GigabitEthernet 1/0/1[H3C-GigabitEthernet1/0/1] dhcp snooping binding record[H3C-GigabitEthernet1/0/1] quit