code: def change_interface_id(self, interface_id):
          
          _, second = self.nicid.split('.')
          self.update(nicid='{}.{}'.format(str(interface_id), second))
docs: Generic change interface ID for VLAN interfaces that are not
          Inline Interfaces (non-VLAN sub interfaces do not have an
          interface_id field).
          
          :param str, int interface_id: interface ID value