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.
-1 Indicates that this threshold is infinite, and incremental
recalculations are always done in preference to a full
recalculation.
0 Indicates that incremental updates will never be used.
1..2147483647 (n)
Indicates that a full recalculation will be performed whenever
there are more than 'n' updates to make to inter-area
or AS-external routes.