IGMP snooping is enabled on the SWP1 Series by default, and does not need to be set.
Enable IGMP snooping when you wish to use multicasting in general. Even in that case, be careful to use a minimum amount of multicast. Dante configures routing with unicast by default, and multicast will not be required for most of small-to-mid scale Dante systems. To understand when the multicast settings of a switch need to be configured, it’s first necessary to understand multicast and "flows".
There are two audio signal transmission methods that can be used in a Dante network. One method is unicast, in which signals are transferred directly from one device to another specific device. The other method is multicast, in which signals are transferred to multiple devices within the network. By default, all audio transmission within a Dante network is unicast, and there is normally no need to change this setting. Now, let’s examine which method is better for sending the same audio signal from one device to several other devices.
In unicast, packets (audio signals) are duplicated for each device that the signal is sent to. You can set the routing for each of the signals separately without considering whether the signals are duplicates of each other. From the standpoint of efficient use of network bandwidth, unicast might not be ideal, but because it results in low switch loads and makes routing configuration easier, we recommend that you use it under normal circumstances.