VLAN segmentation (should be bold)
Isolated tenant "private network" traffic is managed by Neutron by the use of a dedicated network adapter. This network adapter must be attached to an untagged network segment. This network segment also must be reserved only for Neutron on each host (Computes and Controllers). You should not use any other 802.1q VLANs on this network for other purposes. Additionally, each private network requires its own dedicated VLAN, selected from a given range configured in Fuel UI.