This parameter can be used to interrupt a full routing
calculation when the number of pending updates to the Link
State Database has reached a threshold value.
-1 Indicates that this threshold is infinite, and hence no
number of pending updates to the database will cause a
routing calculation to be interrupted.
0 Indicates that an update to the Link State Database will
cause any current routing calculation to be interrupted and
a new one to start.
1..2147483647
Specifies the threshold number of updates that can be made
to the Link State Database such that any subsequent update
to the database causes the current routing calculation to be
interrupted, and a new calculation to start using an up to
date Link State Database.