Configure Bridge VLAN MLD Snooping

Multicast Listener Discovery (MLD) Snooping enables a controller, service platform or access point to examine MLD packets and make forwarding decisions based on content. MLD is used by IPv6 devices to discover devices wanting to receive multicast packets destined for specific multicast addresses. MLD uses multicast listener queries and multicast listener reports to identify which multicast addresses have listeners and join multicast groups.

MLD snooping caps the flooding of IPv6 multicast traffic on controller, service platform or access point VLANs. When enabled, MLD messages are examined between hosts and multicast routers and to discern which hosts are receiving multicast group traffic. The controller, service platform or access point then forwards multicast traffic only to those interfaces connected to interested receivers instead of flooding traffic to all interfaces.

Use this procedure to configure or modify MLD Snooping parameters for the Bridge VLAN profile.

  1. Choose from the following actions:
    • If you are in the process of configuring a new Bridge VLAN profile, proceed to the next step.
    • If you want to modify an existing Bridge VLAN profile, go to Profiles <select a device profile> Network > Bridge VLAN. Select associated with a Bridge VLAN profile entry to modify it. Modify the settings in accordance with the steps in this procedure.
  2. Select the MLD Snooping tab and configure the parameters as described in MLD Snooping Tab Parameters.
    Table 1. MLD Snooping Tab Parameters
    Parameter Description
    General
    Enable MLD Snooping

    The Enable MLD Snooping function examines MLD packets and supports content forwarding on this Bridge VLAN. Packets delivered are identified by a single multicast group address. Multicast packets are delivered using best-effort reliability, just like IPv6 unicast.

    MLD Snooping is enabled by default.
    Forward Unknown Packets

    Forward Unknown Packets enables multicast forwarding of unknown IPv6 packets.

    Forwarding of unknown packets is enabled by default.
    Multicast Router
    Interface Names Select the Interface Names to be used for MLD snooping.
    Multicast Router Learn Mode

    Set Multicast Routing Learn Mode to either Pim-dvmrp or Static.

    DVMRP builds a parent-child database using a constrained multicast model to build a forwarding tree rooted at the source of the multicast packets. Multicast packets are initially flooded down this source tree. If redundant paths are on the source tree, packets are not forwarded along those paths.

    Pim-dvmrp is the default setting.
    MLD Querier
    Enable MLD Querier

    Select Enable MLD Querier to enable MLD querier on the controller, service platform or access point. When enabled, the device sends query messages to discover which network devices are members of a given multicast group.

    Enable MLD Querier is enabled by default.
    MLD Version

    Select MLD Version to enable it. Select either version 1 or 2 to define which version is to be used with the MLD querier.

    • MLD version 1 is based on IGMP version 2 for IPv4.

    • MLD version 2 is based on IGMP version 3 for IPv4 and is fully backward compatible.

      IPv6 multicast uses MLD version 2.

    The default setting is version 2.
    Maximum Response Time

    Specify the Maximum Response Time (1 – 25000 milliseconds) before sending a responding report. Queriers use MLD reports to join and leave multicast groups and receive group traffic.

    The default setting is 1 millisecond.
    Other Querier Timer Expiry

    Specify an interval (60 – 300 seconds) to be used as a timeout interval for other querier resources.

    The default setting is 60 seconds.
  3. If Bridge VLAN configuration is complete, select Add. Otherwise, select the General or IGMP Snooping tabs and continue with configuration.
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