Comment 13 for bug 2043970

MAAS tries to detect the VLAN for a discovered interface and associate it with the appropriate fabric. In this case, when the interface has no IP address, MAAS tries to put an interface into a VLAN and into a fabric before it has all the information, so it creates a new default vlan and a new fabric. It makes more sense to delay that action until the operator indicates their choice.

We will disable creation of new vlans and fabrics during hardware sync.
A similar situation happens during commissioning, when MAAS discovers new interfaces. As we are unsure if there are users who rely on that behavior, we will not disable automatic creation of vlans and fabrics in that stage. If there's community feedback that this function is not really useful, we will remove it in a consecutive major version of MAAS.