Configuring MLD Snooping Queriers

In an IPv6 environment, MLD Snooping requires that one central switch or router periodically query all end-devices on the network to announce their multicast memberships. This central device is the 'MLD querier'. The MLD query responses, known as MLD reports, keep the switch updated with the current multicast group membership on a port-by-port basis. If the switch does not receive updated membership information in a timely fashion, it will stop forwarding multicasts to the port where the end device is located.

These pages enable you to configure and display information on MLD Snooping queriers on the network and, separately, on VLANs.

MLD Snooping Querier Configuration

Use this page to enable or disable the MLD Snooping Querier feature, specify the IP address of the router to perform the querying, and configure related parameters. Users must have Read/Write access privileges to change the data on this page.

To access this page, click Switching > MLD Snooping Querier > MLD Snooping Querier Configuration.

MLD Snooping Querier Configuration

MLD Snooping Querier Configuration Fields

Field	Description
Snooping Querier Admin Mode	Select the administrative mode for MLD Snooping for the switch from the pulldown menu. The default is Disable.
Snooping Querier Address	Specify the Snooping Querier Address to be used as source address in periodic MLD queries. This address is used when no address is configured on the VLAN on which query is being sent.
MLD Version	Specify the MLD protocol version used in periodic MLD queries.
Query Interval	Specify the time interval in seconds between periodic queries sent by the snooping querier. The Query Interval must be a value in the range of 1 and 1800. The default value is 60.
Querier Expiry Interval	Specify the time interval in seconds after which the last querier information is removed. The Querier Expiry Interval must be a value in the range of 60 and 300. The default value is 60.

If you configure an MLD Snooping querier, click Submit to apply the new settings to the switch.
Click Refresh to redisplay the page with the latest information from the switch.

MLD Snooping Querier VLAN Configuration

Use this page to configure MLD queriers for use with VLANs on the network. To access this page, click Switching > MLD Snooping Querier > MLD Snooping Querier VLAN Configuration.

MLD Snooping Querier VLAN Configuration

MLD Snooping Querier VLAN Configuration Fields

Field	Description
VLAN ID	Specifies VLAN ID for which MLD Snooping Querier is to be enabled. You can select New Entry to create a new VLAN ID for the MLD Snooping feature.
Querier Election Participate Mode	Enables or disables Querier Participate Mode. When this mode is disabled, upon seeing another querier of same version in the VLAN, the snooping querier moves to non-querier state. When enabled, the snooping querier participates in querier election, in which the least IP address operates as the querier in that VLAN. The other querier moves to non-querier state.
Snooping Querier VLAN Address	Specifies the Snooping Querier Address to be used as source address in periodic IGMP queries sent on the specified VLAN.

If you configure or modify the participate mode of a snooping querier for a VLAN, click Submit to apply the new settings.
Click Refresh to redisplay the page with the latest information from the switch.
To remove a querier from the network, select its VLAN ID and click Delete.

MLD Snooping Querier VLAN Configuration Summary

Use this page to view summary information for MLD Snooping queriers for on VLANs in the network. To access this page, click Switching > MLD Snooping Querier > MLD Snooping Querier VLAN Configuration Summary in the navigation menu.

MLD Snooping Querier VLAN Configuration Summary

Field	Description
VLAN ID	Specifies the VLAN ID on which MLD Snooping Querier is administratively enabled.
Querier Election Participate Mode	Displays the querier election participate mode on the VLAN. When this mode is disabled, up on seeing a query of the same version in the VLAN, the snooping querier moves to non-querier state. When this mode is enabled, the snooping querier participate in querier election, in which the lowest IP address operates as the querier in that VLAN. The other querier moves to non-querier state.
Snooping Querier VLAN Address	Displays the Snooping Querier Address to be used as source address in periodic IGMP queries sent on the specified VLAN.

Field

Description

VLAN ID

Specifies the VLAN ID on which MLD Snooping Querier is administratively enabled.

Querier Election Participate Mode

Displays the querier election participate mode on the VLAN.

When this mode is disabled, up on seeing a query of the same version in the VLAN, the snooping querier moves to non-querier state.

When this mode is enabled, the snooping querier participate in querier election, in which the lowest IP address operates as the querier in that VLAN. The other querier moves to non-querier state.

Snooping Querier VLAN Address

Displays the Snooping Querier Address to be used as source address in periodic IGMP queries sent on the specified VLAN.

Click Refresh to redisplay the page with the latest information from the router.

MLD Snooping Querier VLAN Status

Use this page to view the operational state and other information for MLD Snooping queriers for VLANs on the network. To access this page, click Switching > MLD Snooping Querier > MLD Snooping Querier VLAN Status in the navigation menu.

MLD Snooping Querier VLAN Status

MLD Snooping Querier VLAN Status Fields

Field	Description
VLAN ID	Specifies the VLAN ID on which the MLD Snooping Querier is administratively enabled and for which VLAN exists in the VLAN database.
Operational State	Specifies the operational state of the MLD Snooping Querier on a VLAN: Querier: The snooping switch is the querier in the VLAN. The snooping switch will send out periodic queries with a time interval equal to the configured querier query interval. If the snooping switch sees a better querier in the VLAN, it moves to non‐querier mode. Non-Querier: The snooping switch is in non‐querier mode in the VLAN. If the querier expiry interval timer expires, the snooping switch moves into querier mode. Disabled: The snooping querier is not operational on the VLAN. The snooping querier moves to disabled mode when MLD Snooping is not operational on the VLAN, when the querier address is not configured, or the network management address is not configured.
Operational Version	Displays the MLD protocol version of the operational querier.
Last Querier Address	Displays the IP address of the last querier from which a query was snooped on the VLAN.
Last Querier Version	Displays the MLD protocol version of the last querier from which a query was snooped on the VLAN.
Operational Max Response Time	Displays the maximum response time to be used in the queries that are sent by the snooping querier.

Click Refresh to redisplay the page with the latest information from the switch.