Alcatel-Lucent 6850-48 Reference Guide

DHCP Relay Commands

page 36-18

OmniSwitch CLI Reference Guide

Configures a policy that determines how the DHCP relay agent will handle DHCP packets that already 
contain an Option-82 field.

Drop DHCP packets that already contain an Option-82 field.

Keep the existing Option-82 field information and continue to relay the 
DHCP packet.

Replace the existing Option-82 field information with local relay agent 
information and continue to relay the DHCP packet.

By default, DHCP packets that already contain an Option-82 field are dropped.

OmniSwitch 6400, 6850, 6855, 9000, 9000E

• The policy configured with this command is only applied if the DHCP Option-82 feature is enabled for 

the switch.

• The agent information policy is not applied if the DHCP relay agent receives a DHCP packet from a 

client that contains a non-zero value for the gateway IP address (giaddr). In this case, the agent will not 
insert the relay agent information option into the DHCP packet and will forward the packet to the 
DHCP server. 

• Note that if a DHCP packet contains a gateway IP address (giaddr) value that matches a local subnet 

and also contains the Option-82 field, the packet is dropped by the relay agent.

-> ip helper agent-information policy drop

-> ip helper agent-information policy keep

-> ip helper agent-information policy replace

Release 6.1.2; command was introduced.