Cross-host Multicasting on rancher

Is it possible to multicast cross-host on rancher?

Multi-casting works cross-containers on docker automatically because they are all on the same bridged network. Each host contains a network bridge container, so I was assuming all hosts would be on the same virtual bridge.
I have set up two hosts on AWS in the same VPC, and can not get multicasting working between them.
Is there a way to get multicasting to work cross-host? I use multicasting for cluster discovery between containers.

No, the overlay network is Layer 3 only… Some more info here, and the metadata that’s mentioned in there exists now.