When Dante devices are connected to a Cisco switch configured with the Merging configuration file, an additional configuration step is required.

Dante AES67 users have to add IP Multicast Groups :
Once the configuration file has been applied, and the switch has been rebooted.

• Connect to the Cisco Administration page (default address with Merging configuration file is 169.254.1.254)
• Make sure the Display Mode of the Cisco Administration page is set to Advanced
• Browse to Multicast > IP Multicast Group Address and click on Add. 
• Enter VLAN ID 1 (assuming you have 1 VLAN) and enter 224.0.0.230 as IP Multicast Group Address.
  Click on Apply.
• Now select the 224.0.0.230 Group and click on Details.
  Set the ports connected to Dante devices to Static and click on Apply.
• Repeat the same operation for addresses 224.0.0.231, 224.0.0.232 and 224.0.0.233
  
  (Example with Dante devices on port 9-10).