In the Yamaha Set up Guide is mentioned that you turn it on. It usually also makes sens to have it on, but this special case you can solve the problem by turning it off. Or you upgrade your mac to the latest Dante Virtual Soundcard.
Greets
Couple of things should be address before trying to help... When using the SG300 with Dante, you do not need to configure QOS or IGMP snooping if you are only placing Dante devices on the network. The only setting that needs to be configured is "Energy Efficient Ethernet" or "EEE". This should be turned off.
When should you use QOS? If you plan to have control data (i.e. CL Editor, StageMix, etc) on the network, as well as Dante audio, then the QOS settings in the guide should be used. This will make sure the Dante traffic is given priority over all other traffic. If you only have Dante traffic, you do not need to configure QOS.
When should you use IGMP Snooping? If you have a lot of multicast traffic on the network, IGMP will make sure that the multicast packets are only sent to devices that request it. Without IGMP, the multicast traffic would be sent to every port, regardless of whether or not the device is subscribed to receive those packets. Think of it as junk mail versus a magazine subscription.
Do I need to use multicast? It depends... Basically, Dante uses two methods for distributing audio. Unicast Flows and Multicast Flows. Unicast flows go to one device, multicast flows are sent everywhere on the network (unless IGMP is setup as described above). The default method for audio distribution is unicast, and each unicast flow can contain up to 4-channels of audio. The alternate method, multicast flows, can have up to 8-channels per flow. The number of flows, both unicast and multicast, available per device varies by device and can be viewed in Dante Controller ('Device View' -> 'Transmit' tab). Understanding the number of available flows and how many channels can be placed in each flow will help you decide if you need to use multicast or unicast.
For example, our Rio3224-D has 32 flows. Doing the math (32-channels / 4-channels per flow), we see that it takes 8 unicast flows to send all 32-channels to a single device. Routing all 32-channels to 2 devices will use 16 flows. Routing to 3 devices will use 24-flows and routing to 4-devices uses all 32 flows. Therefore, if we need to send all 32-channels to 5 devices or more, this cannot be done using unicast. We have to switch to multicast instead (wishbone looking icon on the 'device view' window).
Another example, DVS has 16 input flows and 16 output flows. If I have DVS set to 64x64 and want to route all 64 channels to one device, this can be done using unicast (64-channels / 4-channels per flow = 16 flows). If I need to route audio to more than one device, this must be done using multicast flows.
Same rules will apply to the input flows of DVS. However, at this time, Dante Controller does not let you know how many input flows are being used. So, if you are sending channels to DVS from multiple devices, you'll need to do the math and figure out if you have enough input flows available.
As for the problem you are having Justice, I have seen the red circle when there is just Dante traffic on the network in the cases listed below. Some of them have already been mentioned, but I've included them anyway as this is how I typically troubleshoot the problem.
1) Sample Rate mismatch
2) Receiver and transmitter are in different IP subnets (i.e. 192.168.X.X vs 169.254.X.X.)
3) Transmitting device is out of output flows
4) Receiving device is out of input flows
5) Dante Firmware incompatibility
6) Hardware issues
Hardware issues popped up for us in one case involving a Mac. The end user was able to use one Mac just fine, but his other Mac would not playback or record. Turned out that the chipset for the ethernet adapters was not the same between the two generations of Mac's. They were both Macbook Pro's but did not perform equally with the built-in ethernet adapter. Once we switched him over to a thunderbolt-to-ethernet adapter, he could record and playback without problems. Same computer, different adapters, different results...
