docs: def bridge_create(br, may_exist=True, parent=None, vlan=None):
      '''
      Creates a new bridge.
  
      Args:
          br: A string - bridge name
          may_exist: Bool, if False - attempting to create a bridge that exists returns False.
          parent: String, the name of the parent bridge (if the bridge shall be
              created as a fake bridge). If specified, vlan must also be
              specified.
          vlan: Int, the VLAN ID of the bridge (if the bridge shall be created as
              a fake bridge). If specified, parent must also be specified.
  
      Returns:
          True on success, else False.
  
      .. versionadded:: 2016.3.0
  
      CLI Example:
      .. code-block:: bash
  
          salt '*' openvswitch.bridge_create br0
      '''
      param_may_exist = _param_may_exist(may_exist)
      if parent is not None and vlan is None:
          raise ArgumentValueError(
              'If parent is specified, vlan must also be specified.')
      if vlan is not None and parent is None:
          raise ArgumentValueError(
              'If vlan is specified, parent must also be specified.')
      param_parent = '' if parent is None else ' {0}'.format(parent)
      param_vlan = '' if vlan is None else ' {0}'.format(vlan)
      cmd = 'ovs-vsctl {1}add-br {0}{2}{3}'.format(br, param_may_exist, param_parent,
                                             param_vlan)
      result = __salt__['cmd.run_all'](cmd)
      return _retcode_to_bool(result['retcode'])