Are these extensions shown with OpenStack's client openstack extension list extensions that are available or extensions that are enabled? I ask, because there is a notion of an extension that is not enabled. And I'm wondering if this is showing that the extension exists and is enabled, or that it can be enabled by an administrator?
Also somethings mention ml2 extension drivers, are these drivers listed in the output of extension list?
Yes, the extension command will list the plugins that are enabled
openstack extension list | grep dns
| FloatingIpDns | os-floating-ip-dns | Floating IP DNS support. |
| DNS Integration | dns-integration | Provides integration with DNS. |
