It was introduced as TechPreview in https://bugzilla.redhat.com/show_bug.cgi?id=1335995. We need QE coverage and documentation for make it fully supported. Ideally, we need more ML2 plugin vendors on board with it. Even better, a generic ML2 plugin capable of working with ironic.
Verified by: https://polarion.engineering.redhat.com/polarion/#/project/RHELOpenStackPlatform/workitem?id=RHELOSP-40439
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2019:0045