Compatibilidade de pontes parece ter sido descartada desde o OVS 1.10.0
A partir da nota de lançamento do OVS 1.10.0 :
Bridge compatibility support has been removed. Any uses that rely on ovs-brcompatd will have to stick with Open vSwitch 1.9.x or adapt to native Open vSwitch support (e.g. use ovs-vsctl instead of brctl).
veja também: link