Alcatel-Lucent 6850-48 Reference Guide

DHCP Relay Commands

OmniSwitch CLI Reference Guide

page 36-21

Globally enables or disables the suppression of DHCP broadcast traffic on the switch. When this feature is 
enabled, all DHCP broadcast packets are forwarded to the relay agent for processing even if the client and 
server reside in the same VLAN.

This command is currently not supported. Traffic suppression is automatically enabled when DHCP 
Snooping is enabled for the switch or for specific VLANs.

Enables traffic suppression for the switch.

Disables traffic suppression for the switch.

By default, traffic suppression is disabled for the switch.

OmniSwitch 6400, 6850, 6855, 9000, 9000E

• When traffic suppression is enabled, any active relay agent features (e.g., Option-82 data insertion, 

DHCP Snooping) are also effected on all DHCP broadcast traffic, regardless of the VLAN in which the 
traffic originated.

• Enabling traffic suppression requires the configuration of IP helper addresses for all DHCP servers, 

even if the server resides in the same VLAN as the DHCP clients. 

• Note that enabling DHCP traffic suppression for the switch overrides any traffic suppression status 

configured for an individual DHCP Snooping port.

• If the per-VLAN UDP Relay mode is active for the switch, DHCP broadcast traffic originating in a 

VLAN that does not have an IP helper address configured is still broadcast whether or not traffic 
suppression is enabled for the switch. 

• When traffic suppression is disabled, DHCP packets are flooded on the default VLAN for the port. 

Any DHCP server in the same VLAN domain as the client will receive and respond to such packets 
without the involvement of the relay agent.

-> ip helper traffic-suppression enable

-> ip helper traffic-suppression disable

Release 6.1.3; command was introduced.
Release 6.1.5; command was deprecated.