在某些網路環境下禁止手動修改ip，防止位址衝突。為此禁止手動修改ip也可以在交換機上實現。具體參考如下：
#開啟dhcp snooping並且新增信任介面
[h3c]dhcp snooping enable
[h3c]inte***ce gigabitethernet 1/0/8
[h3c-gigabitethernet1/0/8]dhcp snooping trust
[h3c-gigabitethernet1/0/8]quit
#將連線終端的物理介面開啟dhcp snooping表繫結記錄功能並檢查ip與mac繫結關係。
[h3c]inte***ce gigabitethernet 1/0/5
[h3c-gigabitethernet1/0/5]dhcp snooping binding record
[h3c-gigabitethernet1/0/5]ip verify source ip-address mac-address
[h3c-gigabitethernet1/0/5]quit
#檢視dhcp snooping繫結關係
[h3c]display ip source binding dhcp-snooping
total entries found: 1
ip address mac address inte***ce vlan type
192.168.1.103 b00c-d16b-c771 ge1/0/5 1 dhcp snooping
#配置中繼
[h3c]dhcp enable
[h3c-vlan-inte***ce10]ip address 192.168.10.252 24
[h3c-vlan-inte***ce10]dhcp select relay
[h3c-vlan-inte***ce10]dhcp relay server-address 192.168.10.254
[h3c-vlan-inte***ce10]quit
#配置記錄和開啟驗證
[h3c]dhcp relay client-information record #記錄dhcp中繼表項
[h3c]inte***ce vlan-inte***ce 10
[h3c-vlan-inte***ce10]ip verify source ip-address mac-address #啟動繫結關係
[h3c-vlan-inte***ce10]quit
#驗證配置
[h3c]display ip source binding dhcp-relay
total entries found: 1
ip address mac address inte***ce vlan type
192.168.10.1 b00c-d16b-c771 vlan10 10 dhcp relay
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