Alcatel-Lucent 6850-48 参照ガイド
DHCP Relay Commands
OmniSwitch CLI Reference Guide
September 2009
page 36-23
ip helper dhcp-snooping
Globally enables or disables DHCP Snooping for the switch. When this feature is enabled, all DHCP
packets received on all switch ports are filtered.
packets received on all switch ports are filtered.
ip helper dhcp-snooping {enable | disable}
Syntax Definitions
enable
Enables DHCP Snooping for the switch.
disable
Disables DHCP Snooping for the switch.
Defaults
By default, this feature is disabled.
Platforms Supported
OmniSwitch 6400, 6850, 6855, 9000, 9000E
Usage Guidelines
• 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.
of switch level snooping.
• When DHCP Snooping is enabled at the switch level, MAC address verification and Option-82 data
insertion are enabled by default. In addition, the trust mode for all ports is set to the DHCP client only
mode.
mode.
Examples
-> ip helper dhcp-snooping enable
-> ip helper dhcp-snooping disable
Release History
Release 6.1.2; command was introduced.
Related Commands
MIB Objects
iphelperDhcpSnooping
.Enables or disables DHCP Snooping on a per VLAN basis.
Displays the current DHCP configuration for the switch.