Comment 17 for bug 1853047

We reproduced it together with Jason with FCE now.

The issue seems to be that there are two bridges, looking something like this:

  br0:
    eth0.1234 (fabric0, vlan 1234)

  br1:
    eth0 (fabric0, vlan 2345)

Then FCE moves the 2345 vlan to fabric1, which results in this setup:

  br0:
    eth0.1234 (fabric0, vlan 1234)

  br1:
    eth0 (fabric1, vlan 2345)

And in the process, MAAS creates an empty 1234 vlan in fabric1.

So this is a bug in MAAS. The fabric of the physical interfaces and its vlan interfaces can't really be in the same fabric. But at the very least, MAAS shouldn't create an empty 1234 vlan in fabric1.

I'm not sure what the correct fix is, though. We'll have to reproduce this locally and see what MAAS is actually doing.