'stp: use spanning tree protocol? (default False)
prio: optional explicit bridge priority for STP'

def __init__(self, name, stp=False, prio=None, **kwargs):

    self.stp = stp
    if prio:
        self.prio = prio
    else:
        self.prio = LinuxBridge.nextPrio
        LinuxBridge.nextPrio += 1
    Switch.__init__(self, name, **kwargs)
