Bridge VLAN IGMP Snooping

IGMP Snooping is used to keep host memberships alive. It is primarily used in a network where there is a multicast streaming server, hosts subscribed to the server, and no IGMP querier present. An IGMP querier sends out periodic IGMP query packets. Interested hosts reply with an IGMP report packet. IGMP Snooping is only conducted on wireless radios. IGMP multicast packets are flooded on wired ports. IGMP multicast packets are not flooded on the wired port. IGMP membership is also learned on it and only if present, then it is forwarded on that port.

Use this procedure to configure or modify IGMP 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 IGMP Snooping tab and configure the parameters as described in IGMP Snooping Tab Parameters.
    Table 1. IGMP Snooping Tab Parameters
    Parameter Description
    General
    Enable IGMP Snooping Enable IGMP Snooping is enabled by default. If disabled, snooping on this Bridge VLAN is disabled, and the settings under bridge configuration are overridden.
    Forward Unknown Unicast Packets

    Forward Unknown Unicast Packets enables multicast forwarding of packets from unregistered multicast groups. If disabled, unknown multicast forwarding is also disabled for this Bridge VLAN.

    Forwarding of unknown packets is enabled by default.
    Enable Fast Leave Processing

    Select Enable Fast Leave Processing to remove a Layer 2 LAN interface from the IGMP snooping forwarding table entry without initially sending IGMP group-specific queries to the interface. When receiving a group specific IGMPv2 leave message, IGMP snooping removes the interface from the Layer 2 forwarding table entry for that multicast group, unless a multicast router was learned on the port. Fast-leave processing enhances bandwidth management for all hosts on the network.

    This parameter is disabled by default.
    Last Member Query Count Specify the number (1–7) of group-specific queries sent before removing an IGMP snooping entry. The default setting is 2.
    Multicast Router
    Interface Names Select the interface used for IGMP snooping over a multicast router. Multiple interfaces can be selected.
    Multicast Router Learn Mode Select static or pim-dvmrp as the mode used to determine client multicast traffic levels on specific routes.
    IGMP Querier
    Enable IGMP Querier Enable IGMP Querier is selected by default.
    Source IP Address Define an IP address applied as the Source IP Address in the IGMP query packet. This address is used as the default VLAN querier IP address.
    IGMP Version Set the IGMP Version compatibility to either version 1, 2, or 3. The default setting is 3.
    Maximum Response Time

    Specify the Maximum Response Time (1 – 25 seconds) before sending a responding report. When no reports are received from a radio, radio information is removed from the snooping table. For IGMP reports from wired ports, reports are only forwarded to the multicast router ports.

    The default setting is 10 seconds.
    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 MLD Snooping tabs and continue with configuration.
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