Operation Manual – DHCP
H3C S3100 Series Ethernet Switches Chapter 2 DHCP Snooping Configuration
2-9
Operation Command Description
Display information about
unauthorized DHCP
servers
display dhcp-snooping
server-guard
Available in any view
 Note:
z You need to enable DHCP snooping before enabling unauthorized DHCP server
detection.
z Do not configure unauthorized DHCP server detection on a member port of a link
aggregation group.
z Currently, after specifying the source MAC address for DHCP-DISCOVER
messages on an S3100-SI series switch, you cannot use the VLAN-VPN tunnel
function at the same time, and vice versa. In addition, after you specify the source
MAC address for DHCP-DISCOVER messages, the IGMP snooping function
cannot learn router interfaces through PIM messages. For information about router
interfaces, refer to Multicast Operation.
2.3.1 Configuring DHCP Snooping to Support Option 82
 Note:
z Only the S3100-EI series among S3100 series switches support the
DHCP-snooping Option 82 support feature.
z Enable DHCP snooping and specify trusted ports on the switch before configuring
DHCP snooping to support Option 82.
Table 2-6 DHCP-snooping Option 82 support configuration task list
Task Remarks
Enable DHCP-snooping Option 82 support Required
Configure a handling policy for DHCP packets with Option 82 Optional
Configure the storage format of Option 82 Optional
Configure the circuit ID sub-option Optional
Configure the remote ID sub-option Optional
Configure the padding format for Option 82 Optional
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