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To learn which sessions must be configured, or which client or router ports must be added or removed, a mechanism to draw that information from the layer 3 protocols must be enabled. For the Avaya Multiservice Switch, IGMP Snooping is that mechanism. IGMP Snooping can learn about multicast sessions from IP interfaces that reside on the same switch.
* Note: IGMP Snooping is only available for VLANs that have an IGMP interface enabled.
Enabling DVMRP on an interface also enables IGMP.
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