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Yes, you will need a separate interface enslaved in a separate bridge for the flat network. The weird thing is that you have to include the symbolic name for the flat network in the list of vlan ranges, eg physnet2 here:

# ovs_quantum_plugin.ini on controller, netnodes and compute-nodes
[OVS]
...
network_vlan_ranges = physnet1:1000:1999, physnet2
bridge_mappings = physnet1:br-vlans, physnet2:br-flat
...

Then you should be able to create networks like:

quantum net-create net1 --provider:network_type vlan \
    --provider:physical_network physnet1 \
    --provider:segmentation_id 1234

quantum net-create net2 --provider:network_type flat \
    --provider:physical_network physnet2