MLD

MLD (Multicast Listener Discovery) 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.

To view network MLD statistics:

  1. Select the Statistics menu from the Web UI.
  2. Expand the System node from the navigation pane (on the left-hand side of the screen). The System node expands to display the RF Domains created within the managed network.
  3. Expand the RF Domain node.
  4. Select a Wireless Controller.
  5. Expand the Network menu from the left-hand side of the UI.
  6. Select MLD.
    The Statistics > Controller > MLD stats is displayed in the right-hand pane.
    Click to expand in new window
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    The Multicast Listener Discovery (MLD) Group field describes the following:
    VLAN Displays the group VLAN where the MLD groups multicast transmission is conducted.
    Group Address Displays the Multicast Group ID supporting the statistics displayed. This group ID is the multicast address hosts are listening to.
    Port Members Displays the ports on which MLD multicast clients have been discovered. For example, ge1, radio1, etc. Ports can vary somewhat amongst supported controller and service platform models.
    Version Displays each listed group‘s version compatibility as either version 1, 2 or 3.
    The IPv6 Multicast Router (MRouter) field describes the following:
    VLAN Displays the group VLAN where the multicast transmission is conducted.
    MINT IDs Lists MiNT IDs for each listed VLAN. MiNT provides the means to secure communications at the transport layer. Using MiNT, a controller or service platform can be configured to only communicate with other authorized (MiNT enabled) devices.
    Learn Mode Displays the learning mode used by the router as either Static or PIM-DVMRP.
    Port Members Displays the physical ports on which multicast clients have been discovered by the multicast router. For example, ge1, radio1, etc. Ports can vary somewhat amongst supported controller and service platform models.
    Query Interval Lists the query interval implemented when the querier functionality is enabled. The default value is 60 seconds.
    Version Lists the multicast router version compatibility as either version 1, 2 or 3. The default setting is 3.
  7. Select Refresh to update the screen's statistics counters to their latest values.
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