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DES-7200 Configuration Guide Chapter 9 DHCP Snooping Configuration
9-5
9.1.8 Other
Precautions on
DHCP
Snooping
Configuration
The DHCP Snooping function and the DHCP Option82 function of 802.1xare
mutually exclusive. That is, you can not enable the DHCP Snooping function and
the DHCP Option82 function of 802.1x at the same time.
DHCP Snooping snoops only the DHCP process of users. ARP Inspection is
necessary to restrict users to use the IP address assinged by the DHCP protocol
for Internet access. However, ARP Inspection needs to check all ARP messages,
which will influence the overall performance of the switch.
When the DHCP client with Hybrid interface connects to the DHCP Server
through untagged VLAN, the share VLAN should be enabled and the untagged
VLAN should be set to be share VLAN. For the number of share VLANs
supported, refer to Section Share VLAN Configuration of Configuration Guide.
9.2 DHCP Snooping
Configuration
9.2.1 Enabling and
Disabling
DHCP
Snooping
The DHCP Snooping function of the device is disabled by default. To enable DHCP Snooping
and then monitor DHCP packets, execute the following command.
Command Function
DES-7200# configure terminal
Enter the global configuration mode.
DES-7200(config)# [no] ip dhcp snooping
Enable or disable DHCP snooping.
The following example demonstrates how to enable the DHCP snooping function of the
device:
DES-7200# configure terminal
DES-7200(config)# ip dhcp snooping
DES-7200(config)# end
Caution
DHCP Snooping and Private VLAN function cannot enabled at the same time.