Alcatel-Lucent OmniSwitch 6250 - Ip Helper Dhcp-Snooping Bypass Option-82-Check

DHCP Relay Commands
OmniSwitch 6250 CLI Reference Guide November 2009 page 32-27
ip helper dhcp-snooping bypass option-82-check
Enables or disables checking for an Option-82 field in DHCP packets ingressing on untrusted ports.
ip helper dhcp-snooping bypass option-82-check {enable | disable}
Syntax Definitions
enable Bypasses the Option-82 field check.
disable Checks DHCP packets for the Option-82 field.
Defaults
By default, this feature is disabled.
Platforms Supported
OmniSwitch 6250
Usage Guidelines
• When this feature is disabled (the default), DHCP packets ingressing on untrusted ports are checked to
see if they contain the Option-82 field. If this field is present, the DHCP packet is discarded.
• When this feature is enabled, DHCP packets ingressing on untrusted ports are not checked to see if
they contain the Option-82 field. In this case, the Option-82 field is ignored and all DHCP packets are
processed.
• Using this command is only allowed when DHCP Snooping is enabled globally for the switch or at the
VLAN level.
Examples
-> ip helper dhcp-snooping bypass option-82-check enable
-> ip helper dhcp-snooping bypass option-82-check disable
Release History
Release 6.6.1; command was introduced.
Related Commands
MIB Objects
iphelperDHCPSnoopingBypassOpt82CheckStatus
ip helper dhcp-snooping Globally enables or disables DHCP Snooping for the switch.
show ip helper Displays the current DHCP configuration for the switch.