configure igmp router-alert transmit

configure igmp router-alert transmit [on | off] {{vlan} vlan_name}


Controls whether the router-alert option is set when forwarding IGMPv2 and IGMPv3 packets.

Syntax Description

vlan Applies the configuration only to the specified This command is available on the ExtremeSwitching X440-G2, X450-G2, X460-G2, X465, X590, X620, X670-G2, X690, X695, X870, 5320, 5420, 5520 series switches.. If no VLAN is specified, the configuration applies to all VLANs.


On—The router-alert option is set when forwarding IGMPv2 and IGMPv3 packets.

Usage Guidelines

IETF standards require that a router set the router-alert option in forwarded IGMPv2 and IGMPv3 packets. The ExtremeXOS software has been updated to comply with this requirement using the default settings.

Earlier versions of the ExtremeXOS software forwarded all IGMP packets without setting the router-alertoption. If compatibility issues arise, you can configure the software to use the legacy behavior by using this command with the off option.


The following command configures the switch for IETF compliant IGMP packet processing:

configure igmp router-alert transmit on


This command was first available in ExtremeXOS 12.5.3.

Platform Availability

This command is available on platforms that support the appropriate license. For complete information about software licensing, including how to obtain and upgrade your license and which licenses support the IPv4 multicast feature, see the ExtremeXOS and Switch Engine 31.7 Feature License Requirements document.