CISCO路由器配置为DHCP服务器
Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z.Router1(config)#ip dhcp pool ROOT
Router1(dhcp-config)#network 172.25.0.0 255.255.0.0
Router1(dhcp-config)#domain-name oreilly.com
Router1(dhcp-config)#dns-server 172.25.1.1 10.1.2.3
Router1(dhcp-config)#lease 2
Router1(dhcp-config)#exit
Router1(dhcp)#ip dhcp pool 172.25.1.0/24
Router1(dhcp-config)#network 172.25.1.0 255.255.255.0
Router1(dhcp-config)#default-router 172.25.1.1
Router1(dhcp-config)#exit
Router1(dhcp)#ip dhcp pool 172.25.2.0/24
Router1(dhcp-config)#network 172.25.2.0 255.255.255.0
Router1(dhcp-config)#default-router 172.25.2.1
Router1(dhcp-config)#lease 0 0 10
Router1(dhcp-config)#end
Router1#
必须说明的是，dhcp租期配置信息是唯一不能继承的dhcp配置选项，也就是说，你必须为每个孩子地址池显式配置dhcp租期。如果该地址池没有配置dhcp租期。则路由器使用默认的租期（24小时）。
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