code: def intf_up(self, interface):
          '''
          Can be called when an interface is put in service.
          FIXME: not currently used; more needs to be done to
          correctly put a new intf into service.
          '''
          if interface.name not in self._devinfo:
              self._devinfo[interface.name] = interface
              if self._devupdown_callback:
                  self._devupdown_callback(interface, 'up')
          else:
              raise ValueError("Interface already registered"f intf_up(self, interface):
          '''
          Can be called when an interface is put in service.
          FIXME: not currently used; more needs to be done to
          correctly put a new intf into service.
          '''
          if interface.name not in self._devinfo:
              self._devinfo[interface.name] = interface
              if self._devupdown_callback:
                  self._devupdown_callback(interface, 'up')
          else:
              raise ValueError("Interface already registered")
docs: Can be called when an interface is put in service.
          FIXME: not currently used; more needs to be done to
          correctly put a new intf into service.