The Open Virtual Networking (OVN) Kubernetes network plug-in is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

For more information about the support scope of the OVN Technology Preview, see https://access.redhat.com/articles/4380121.

About multicast

With IP multicast, data is broadcast to many IP addresses simultaneously.

At this time, multicast is best used for low-bandwidth coordination or service discovery and not a high-bandwidth solution.

Multicast traffic between OKD Pods is disabled by default. If you are using the OVN-Kubernetes Pod network provider, you can enable multicast on a per-project basis.

Enabling multicast between Pods

You can enable multicast between Pods for your project.

Prerequisites
  • Install the OpenShift Command-line Interface (CLI), commonly known as oc.

  • You must log in to the cluster with a user that has the cluster-admin role.

Procedure
  • Run the following command to enable multicast for a project:

    $ oc annotate namespace <namespace> \ (1)
        k8s.ovn.org/multicast-enabled=true
    1 The namespace for the project you want to enable multicast for.