A sample configuration would be:
allow-ovs br0
iface br0 inet4 static
address …
netmask …
ovs_type OVSBridge
allow-br0 eth0
iface eth0 inet6 auto
ovs_type OVSPort
ovs_bridge br0
allow-hotplug usb0
iface usb0 inet6 auto
ovs_type OVSPort
ovs_bridge br0
Reco