DHCP Relay Commands
page 32-28 OmniSwitch 6250 CLI Reference Guide November 2009
ip helper dhcp-snooping vlan
Enables or disables DHCP Snooping on a per VLAN basis. When this feature is enabled, all DHCP pack-
ets received on ports associated with the DHCP Snooping VLAN are filtered.
ip helper dhcp-snooping vlan vlan_id [mac-address verification {enable | disable}] [option-82 data-
insertion {enable | disable}]
no ip helper dhcp-snooping vlan vlan_id
Syntax Definitions
vlan_id The VLAN identification number (1–4094).
mac-address verification Enables or disables verifying the source MAC address of DHCP pack-
ets with the client MAC address contained in the same packet.
option-82 data-insertion Enables or disables inserting Option-82 information into DHCP packets.
Defaults
By default, DHCP Snooping is disabled. When this feature is enabled for the specified VLAN, the follow-
ing default parameter values apply:
Platforms Supported
OmniSwitch 6250
Usage Guidelines
• Use the no form of this command to disable DHCP Snooping for the specified VLAN.
• The MAC address verification and Option-82 data insertion are applied to packets received on ports
associated with the DHCP Snooping VLAN.
• If the DHCP relay agent Option-82 feature is enabled, DHCP Snooping is not available. These two
features are mutually exclusive.
• If the DHCP Snooping feature is globally enabled for the switch, then configuring snooping on a per-
VLAN basis is not allowed. The opposite is also true; invoking VLAN based snooping prevents the use
of switch level snooping.
• Note that disabling the Option-82 data insertion operation for a VLAN is not allowed when the bind-
ing table functionality is enabled.
Examples
-> ip helper dhcp-snooping vlan 100 enable
-> ip helper dhcp-snooping vlan 100 disable
parameter default
mac-address verification Enabled
option-82 data-insertion Enabled
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