D-Link DGS-3630-52PC Manual - Page 445
ip dhcp snooping server-screen
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DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide Switch# configure terminal Switch(config)# service dhcp Switch(config)# dhcp-server-screen profile campus Switch(config-dhcp-server-screen)# 25-4 ip dhcp snooping server-screen This command is used to enable DHCP server screening. Use the no form of this command to disable it. ip dhcp snooping server-screen [SERVER-IP-ADDRESS profile PROFILE-NAME] no ip dhcp snooping server-screen [SERVER-IP-ADDRESS] Parameters SERVER-IP-ADDRESS profile PROFILE-NAME (Optional) Specifies the trust DHCP sever IP address. (Optional) Specifies the profile with the client MAC address list for the DHCP sever. Default None. Command Mode Interface Configuration Mode. Command Default Level Level: 12. Usage Guideline The command is available for physical port and port channel. The DHCP server screening function is used to filter the DHCP server packets on the specific interface and receive the trust packets from the specific source. This feature can make a protected network usable when a malicious host sends DHCP server packets. If the server IP address is not specified, it will enabled or disabled the DHCP server screen on the interface. By default, the DHCP server screen is disabled on all interfaces. If enabled, the DHCP server screen, on a specific interface, will filter all DHCP server packets from the interface and only forward trusted server packets. If a server screen entry is defined with a profile that contains a client MAC address, then the server message with the server IP address and the client addresses contained in the profile is forwarded. If an entry is defined without the client's MAC address, then the server message with the specified server IP address will be forwarded. Each server can only have one corresponding entry in the table. If the entry is defined with a profile but the entry does not exist, then messages with the server IP specified by the entry are not forwarded. Example This example shows how to configure a DHCP server screen profile named "campus-profile" and associate it with a DHCP server screen entry for ethernet 1/0/3. 440
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