拓扑图如下：
配置LSW7：
sys dhcp en dhcp snooping enable dhcp server ping packet 3 dhcp server ping timeout 100 ip pool vlan10 gateway-list 192.168.10.254 network 192.168.10.0 mask 255.255.255.0 lease day 3 hour 0 minute 0 dns-list 192.168.10.254 interface Vlanif10 ip address 192.168.10.254 255.255.255.0 dhcp select global port-group test1 group-member g0/0/1 to g/0/0/24 port link-type access port default vlan 10
查看地址池IP使用情况：
dis ip pool name vlan10 used