I have a small Lutron setup, but the client has lots of devices on the LAN, including Control4 processors and Control4 doorstations. I was mentioned on the Control4 forum that another dealer found that the Lutron QS processor sends a lot of frequent broadcast packets and since they isolated the processor (own VLAN) they stopped having issues.
Below is the post from C4:
has anyone experienced Lutron HomeWorks QS processors having negative impact on other gear on the LAN, e.g. Unifi AP to controller adoptions, slow web browsing, and Control4 intercom (2 × C4-DSC + 2 × glassedge touch screens)?
So far it seems like all the problems mentioned above went away when the Lutron processor was confined in a different subnet / multicasts were blocked from affecting the rest of the network.
The problem with Control4 intercom was that the door stations would get stuck regularly, nobody could ring the customer’s home from the outside etc.
Here’s a Wireshark capture of the multicasts.
Tried googling for 220.127.116.11 to see if there is any information about it. No luck. It doesn’t seem familiar to me either.
From the Wireshark captures I can see it’s sending 20 of these multicast datagrams per second. I guess it’s not that many. But I’m still wondering what they are.