Comment 6 for bug 810563

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Thierry Carrez (ttx) wrote : Re: Unable to start networking (trying to add VLAN #100 to IF -:None:- error: No such device)

The issue is that bridge_interface is None by default ({vlan,flat}_interface flag is None by default and nova-manage uses flag if you don't specify a bridge interface when creating network).

Then ensure_vlan_bridge (and ensure_vlan) happily try to use "None" as the bridge interface name.