code: def vdp_vlan_change_cb(self, port_uuid, lvid, vdp_vlan, fail_reason):
          
          LOG.info("Vlan change CB lvid %(lvid)s VDP %(vdp)s",
                   {'lvid': lvid, 'vdp': vdp_vlan})
          self.update_vm_result(port_uuid, constants.RESULT_SUCCESS,
                                lvid=lvid, vdp_vlan=vdp_vlan,
                                fail_reason=fail_reason)
docs: Callback function for updating the VDP VLAN in DB.