Further, the maximum number of channels that can be sent is 32 × 4 =128 in the example above, but because the flows assigned to each Dante device contain four channels, the more flows there are that don’t use all four channels, the lower the actual number of channels that can be sent. Therefore, if a transmitter runs out of the available flows, multicast is necessary to reduce the number of transmitted flows. You can check the number of transmitted flows using the Dante Controller software (under Transmit Flows in the Transmit tab of the Device View). A notification will appear if there are not enough available flows. Also, it’s possible for receivers to not have enough flows in special cases, such as when single channels are received from a large number of devices. In such a case, multicast will not reduce the number of flows, so it’s necessary to reconsider the routing itself.
In conclusion, if there are not enough flows available for transmission, use the Dante Controller software to configure multicast, and reconfigure the network so that less flows are used. In such a case, do not use the routing functions that can be configured from specific Dante devices and software such as CL series console and MTX Editor; instead, only configure the routing using Dante Controller. Be careful to keep the number of multicast flows (channels) to the minimum, because multicast flows increase the load that the switch is subjected to. Up to eight channels can be grouped into a multicast flow, further increasing their efficiency.
Taking the above into consideration, perform the following procedures to configure IGMP snooping and related settings only when multicast is necessary.
First, in the following page, select the “Enable” check box next to Bridge Multicast Filtering Status. Select the VLAN ID for the network within which multicasting will be used (in this example, we are assuming that VLAN 2 is for Dante), and set Forwarding Method for IPv6 and Forwarding Method for IPv4 to “IP Group Address”.