DHCP中继配置

配置PC的IP地址获取方式

在SW2（DHCP中继）上配置

创建VLAN，并为其配置IP地址（VLAN10、20配置网关），命令如下：

[SW2]vlan batch 10 20 100

[SW2]interface Vlanif 10

[SW2-Vlanif10]ip address 192.168.10.254 24

[SW2-Vlanif10]interface Vlanif 20

[SW2-Vlanif20]ip address 192.168.20.254 24

[SW2-Vlanif20]interface vlanif 100

[SW2-Vlanif100]ip address 10.10.10.1 30

设置接口类型，并加入对应的VLAN，命令如下：

[SW2]int g0/0/1

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

[SW2-GigabitEthernet0/0/1]port default vlan 10

[SW2]int g0/0/2

[SW2-GigabitEthernet0/0/2]port link-type access

[SW2-GigabitEthernet0/0/2]port default vlan 20

[SW2]int g0/0/3

[SW2-GigabitEthernet0/0/3]port link-type access

[SW2-GigabitEthernet0/0/3]port default vlan 100

配置一条指向DHCP服务器的默认路由，以便把PC发出的DHCP广播报文中继给DHCP服务器，命令如下：

[SW2]ip route-static 0.0.0.0 0 10.10.10.2

开启DHCP并启用DHCP中继，命令如下：

[SW2]dhcp enable 

[SW2]int v 10

[SW2-Vlanif10]dhcp select relay 

[SW2-Vlanif10]dhcp relay server-ip 10.10.10.2

[SW2]int v 20

[SW2-Vlanif20]dhcp select relay 

[SW2-Vlanif20]dhcp relay server-ip 10.10.10.2

在SW1（DHCP）上配置

创建VLAN，加入接口并配置IP地址

[dhcp]vlan batch 100

[dhcp]int g 0/0/1

[dhcp-GigabitEthernet0/0/1]port link-type access 

[dhcp-GigabitEthernet0/0/1]port default vlan 100

[dhcp-GigabitEthernet0/0/1]int v 100

[dhcp-Vlanif100]ip address 10.10.10.2 30

配置到达VLAN10、20的静态路由，以便把DHCP报文发给DHCP中继，命令如下：

[dhcp]ip route-static 192.168.10.0 24 10.10.10.1

[dhcp]ip route-static 192.168.20.0 24 10.10.10.1

创建全局地址池，命令如下：

[dhcp]dhcp enable 

[dhcp]int v 100

[dhcp-Vlanif100]dhcp select global 

[dhcp]ip pool vlan10

[dhcp-ip-pool-vlan10]network 192.168.10.0 mask 24

[dhcp-ip-pool-vlan10]gateway-list 192.168.10.254

[dhcp]ip pool vlan20

[dhcp-ip-pool-vlan20]network 192.168.20.0 mask 24

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

验证实验结果：