configure mld snooping timer

configure mld snooping timer router_timeout host_timeout {{vlan} vlan_name} {{vr} vr_name}


Configures the MLD snooping timers.

Syntax Description

router_timeout Specifies the time in seconds before removing a router snooping entry.
host_timeout Specifies the time in seconds before removing a host‘s group snooping entry.
vlan_name 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.
vr_name Specifies the VR to which the configuration should be applied. If no parameter is specified, the configuration is applied to the current VR contex.


The router timeout default setting is 260 seconds. The host timeout setting is 260 seconds.

Usage Guidelines

Timers should be set to approximately 2.5 times the router query interval in use on the network. Specify the following:

MLD snooping is a Layer 2 function of the switch. It does not require multicast routing to be enabled. The feature reduces the flooding of IPv6 multicast traffic. On the VLAN, MLD snooping optimizes the usage of network bandwidth and prevents multicast traffic from being flooded to parts of the network that do not need it. The switch does not reduce any IP multicast traffic in the local multicast domain (FF02::x).

MLD snooping is enabled by default on the switch. MLD snooping expects at least one device on every VLAN to periodically generate MLD query messages. Without an MLD querier, the switch eventually stops forwarding IPv6 multicast packets to any port, because the MLD snooping entries times out, based on the value specified in host timeout.


The following example configures the MLD snooping timers to 600 seconds for both timers:

configure mld snooping timer 600 600


This command was first available in ExtremeXOS 11.2.

Platform Availability

This command is available on the platforms listed for the IPv6 multicast routing feature in the ExtremeXOS and Switch Engine 31.7 Feature License Requirements document.