使用路由器作DHCP服務器

一個大中型校園網絡中，有一臺路由器，1000臺終端設備，用戶的計算機通過以太網交換機連接到路由器上，通過路由器訪問其他網絡，這些設備手動分配IP地址工作很繁瑣，可以通路由器給PC設備自動分配IP地址。

下面演示使用DHCP中繼來給電腦終端自動分配IP地址的配置方法，DHCP中繼是用于在DHCP服務器與電腦終端之間轉發DHCP報文，主要用于DHCP服務器與電腦終端不在同一個網段時。

路由器R1配置

system-view

sysname R1

1-啟用DHCP服務

[R1]dhcp enable

2-端口配置(配置IP，作為管理IP地址)

[R1]interface GigabitEthernet 0/0/0

[R1-GigabitEthernet0/0/0]ip address 192.168.99.1 24

[R1-GigabitEthernet0/0/0]q

3-建立地址池，有幾個VLAN創建幾個地址池：

[R1]ip pool vlan10

[R1-ip-pool-vlan10]network 192.168.10.0 mask 255.255.255.0；配置網段

[R1-ip-pool-vlan10]gateway-list 192.168.10.254；PC網關

[R1-ip-pool-vlan10]dns-list 8.8.8.8 114.114.114.114；DNS服務器

[R1]ip pool vlan20

[R1-ip-pool-vlan20]gateway-list 192.168.20.254

[R1-ip-pool-vlan20]network 192.168.20.0 mask 255.255.255.0

[R1-ip-pool-vlan20]dhcp server lease day 3

[R1-ip-pool-vlan20]dns-list 8.8.8.8

[R1-ip-pool-vlan20]q

[R1]

4-在網關所在接口，開啟DHCP功能

[R1]interface GigabitEthernet 0/0/0

[R1-GigabitEthernet0/0/0]dhcp select global //全局地址池配置

5-配置路由

[R1]ip route-static 192.168.10.0 24 192.168.99.2

[R1]ip route-static 192.168.20.0 24 192.168.99.2

[R1]

交換機SW1配置

sys

[Huawei]sysname SW1

[SW1]undo info-center enable

[SW1]vlan batch 10 20

1-配置交換機管理IP

[SW1]interface Vlanif 1

[SW1-Vlanif1]ip address 192.168.99.2 24

[SW1-Vlanif1]q

2-啟用DHCP

[SW1]dhcp enable

3-配置VLAN

[SW1]int Vlanif 10

[SW1-Vlanif10]ip address 192.168.10.254 24

[SW1-Vlanif10]dhcp select relay //配置DHCP中繼

[SW1-Vlanif10]dhcp relay server-ip 192.168.99.1

[SW1-Vlanif10]q

[SW1]

[SW1]int vlan20

[SW1-Vlanif20]ip address 192.168.20.254 24

[SW1-Vlanif20]dhcp select relay

[SW1-Vlanif20]dhcp relay server-ip 192.168.99.1

[SW1-Vlanif20]q

[SW1]

4-配置相應的接口類型

[SW1]interface GigabitEthernet 0/0/1

[SW1-GigabitEthernet0/0/1]port link-type trunk

[SW1-GigabitEthernet0/0/1]port trunk allow-pass vlan 10 20

[SW1-GigabitEthernet0/0/1]q

[SW1]

[SW1]interface GigabitEthernet 0/0/2

[SW1-GigabitEthernet0/0/2]port link-type trunk

[SW1-GigabitEthernet0/0/2]port trunk allow-pass vlan 20

[SW1-GigabitEthernet0/0/2]q

[SW1]

交換機SW3配置

system-view

[Huawei]undo info-center enable

[Huawei]sysname SW3

[SW3]dhcp enable

[SW3]vlan batch 10 20

[SW3]interface Vlanif 1

[SW3-Vlanif1]ip address 192.168.99.3 24

[SW3-Vlanif1]q

[SW3]interface GigabitEthernet 0/0/2

[SW3-GigabitEthernet0/0/2]port link-type trunk

[SW3-GigabitEthernet0/0/2]port trunk allow-pass vlan 20

[SW3-GigabitEthernet0/0/2]q

[SW3]interface GigabitEthernet 0/0/10

[SW3-GigabitEthernet0/0/10]port link-type access

[SW3-GigabitEthernet0/0/10]port default vlan 20

[SW3-GigabitEthernet0/0/10]q

[SW3]interface GigabitEthernet 0/0/14

[SW3-GigabitEthernet0/0/14]port link-type access

[SW3-GigabitEthernet0/0/14]port default vlan 20

[SW3-GigabitEthernet0/0/14]q

[SW3]

[SW3]

交換機SW2配置

system-view

[Huawei]undo info-center enable

[Huawei]sysname SW2

[SW2]vlan 10

[SW2]interface GigabitEthernet 0/0/12

[SW2-GigabitEthernet0/0/12]port link-type access

[SW2-GigabitEthernet0/0/12]port default vlan 10

[SW2-GigabitEthernet0/0/12]q

[SW2]

[SW2]interface GigabitEthernet 0/0/1

[SW2-GigabitEthernet0/0/1]port link-type trunk

[SW2-GigabitEthernet0/0/1]port trunk allow-pass vlan 10 20

[SW2-GigabitEthernet0/0/1]q

[SW2]

5-測試