Alcatel-Lucent 6850-48 参考指南

DHCP Relay Commands

OmniSwitch CLI Reference Guide

page 36-29

Enables or disables checking for an Option-82 field in DHCP packets ingressing on untrusted ports. 

Bypasses the Option-82 field check.

Checks DHCP packets for the Option-82 field.

By default, this feature is disabled. 

OmniSwitch 6400, 6850, 6855, 9000, 9000E

• 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.

-> ip helper dhcp-snooping bypass option-82-check enable

-> ip helper dhcp-snooping bypass option-82-check disable

Release 6.1.5; command was introduced.

iphelperDHCPSnoopingBypassOpt82CheckStatus

Globally enables or disables DHCP Snooping for the switch.

Displays the current DHCP configuration for the switch.