Skip to content
Click here to open the documentation of locally-managed switches, including the CLI and API guides.

Page permalink

Always use the following permalink when referencing this page. It will remain unchanged in future help versions.

https://docs.sophos.com/central/customer/help/en-us/index.html?contextId=switch-management-MLD-snooping

MLD snooping

Multicast listener discovery (MLD) snooping performs a similar function for IPv6 as IGMP snooping does for IPv4. With MLD snooping turned on, the switch creates a list of ports that receive multicast data. The switch only forwards multicast data to those ports, which avoids flooding all ports on the switch.

Settings

Go to My Products > Switches > Switches, select the switch or site where you want to configure MLD snooping, and go to L3 protocols > MLD snooping > Settings to configure MLD snooping.

Status turns MLD snooping on or off globally for the switch or site.

Select Enabled or Disabled to turn MLD snooping on or off.

Select Not set to use the MLD snooping status configured locally on the switch.

Report suppression limits the number of membership reports the member sends to multicast-capable routers. Enter a value from 1 to 25.

Click Save to update your settings.

Configuration source shows the origin of the MLD snooping settings.

You can see the MLD snooping settings for each of the VLANs configured on the switch. Click edit Edit. to change the settings for the selected VLAN. You can change the following settings:

  • Status: Turns MLD snooping on or off for the selected VLAN. Select one of the following statuses:

    • Enabled: Turn MLD snooping on.
    • Disabled: Turn MLD snooping off.
    • Not set: Use the MLD snooping status configured locally on the switch.

  • Querier status: The MLD snooping querier sends out MLD queries that trigger MLD report messages from connected devices that want to receive IP multicast traffic. MLD snooping uses these reports to establish correct forwarding. Select from the following options:

    • Enabled: Turn the MLD snooping querier on.
    • Disabled: Turn the MLD snooping querier off.
    • Not set: Use the MLD snooping querier status configured locally on the switch.

  • Querier interval (seconds): Sets the time between general query transmissions. Enter a value from 60 to 600.

  • Version: Select the MLD version to use from the following options:

    • v1: MLDv1. This is equivalent to IGMPv2 for IPv4.
    • v2: MLDv2. This is equivalent to IGMPv3 for IPv4.
    • Not set: Use the MLD version configured locally on the switch.

  • Fast leave: When turned on, the switch considers the port to have only one endpoint attached. This can improve bandwidth usage for a network that frequently experiences many MLD host add and leave requests.

    • Enabled: Turn Fast leave on.
    • Disabled: Turn Fast leave off.
    • Not set: Use the Fast leave status configured locally on the switch.

  • Static ports: Select the ports connected to multicast-enabled routers from the drop-down list.

Click Save to save your changes to the VLAN settings.

Group list

The Group list tab shows the list of discovered multicast groups. These groups of computers or devices receive the same network traffic.