code: def change_vlan_id(self, vlan_id):
          
          intf_id, _ = self.interface_id.split('.')
          self.interface_id = '{}.{}'.format(intf_id, vlan_id)
          for interface in self.interfaces:
              interface.change_vlan_id(vlan_id)
          self.update()
docs: Change the VLAN id for this VLAN interface. If this is an
          inline interface, you can specify two interface values to
          create unique VLANs on both sides of the inline pair. Or
          provide a single to use the same VLAN id.
          
          :param str vlan_id: string value for new VLAN id.
          :raises UpdateElementFailed: failed to update the VLAN id
          :return: None