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 concern intra-area routes. In this case, the Routing Table can be updated either by one full recalculation, or by multiple incremental SPF recalculations. This parameter is used to configure the threshold value for which recalculation by multiple incremental SPF updates is no longer quicker than a single full recalculation. - 0 indicates that incremental SPF updates will never be used. - 1 indicates that a full recalculation will be performed whenever there are more than one updates to make to intra-area routes. - 0xFFFFFFFF indicates that this threshold is infinite, and incremental SPF recalculations are always done in preference to a full recalculation.