What's the feature?

The EVPN feature is still marked as experimental so until we make it fully supported we can still change user facing configuration.

As discussed in https://issues.redhat.com/browse/FDP-3104?focusedId=29001706&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-29001706 the CMS will most likely never use default values.  And the defaults don't allow dual-stack.

So it's probably better to remove the defaults all together and log a warning if the CMS doesn't configure them.

NOTE: this was discussed as an exception for inclusion to 26.03 upstream here: https://mail.openvswitch.org/pipermail/ovs-dev/2026-February/430133.html

Why is it needed?

It's a required change before we mark the feature as non-experimental as it reduces the amount of stuff we need to support.

Who will benefit? 

OVN devs and maintainers.