Ip Helper Traffic-Suppression - Alcatel-Lucent OmniSwitch 6250 Cli Reference Manual

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Table of Contents

DHCP Relay Commands

ip helper traffic-suppression

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.

ip helper traffic-suppression {enable | disable}

Syntax Definitions

By default, traffic suppression is disabled for the switch.

Platforms Supported

OmniSwitch 6250

Usage Guidelines

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 History

Release 6.6.1; command was introduced.

OmniSwitch 6250 CLI Reference Guide

Enables traffic suppression for the switch.

Disables traffic suppression for the switch.

November 2009