This parameter can be used to optimize the performance of the Routing Calculator in the situation where updates that are pending to the Link State Database solely concern inter-area or AS-external routes. In this case, the Routing Table can be updated either by one full recalculation, or by multiple incremental recalculations. This parameter is used to configure the threshold value for which recalculation by multiple incremental updates is no longer quicker than a single full recalculation. - 0 indicates that incremental updates will never be used. - 1 indicates that a full recalculation will be performed whenever there are more than one updates to make to inter-area or AS-external routes. - 0xFFFFFFFF indicates that this threshold is infinite, and incremental recalculations are always done in preference to a full recalculation.