防止非法DHCP服务器接入
1、DHCP
en conf t service dhcp ip dhcp pool dhcptest network 192.168.1.0 /24 default-router 192.168.1.1 dns-server 202.106.0.20 lease 7 exit int f1/0 no switchport ip add 192.168.1.10 255.255.255.0 no shutdown exit
2、非法DHCP
en conf t service dhcp ip dhcp pool undhcp network 192.168.10.0 255.255.255.0 default-router 192.168.10.1 dns 8.8.8.8 lease 7 exit int f1/1 no switchport ip add 192.168.10.10 255.255.255.0 no shutdown exit
3、SW
en conf t ip dhcp snooping int f1/0 ip dhcp snooping trust end show ip dhcp snooping
4、测试
（1）未开启dhcp snooping之前
（2）开启dhcp snooping 之后并关闭DHCP
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