The value of vRtrMplsGenLeastFillReoptiThd specifies in percentage the least
reoptimization threshold parameter used in the least-fill path selection process.
During a timer-based re-signaling of an LSP path which has
vRtrMplsLspLeastFill enabled, CSPF will first update the least-available bandwidth figure
for the current path of this LSP. It then applies the least-fill path
selection method to select a new path for this LSP. If the new computed path
has the same cost as the current path, it will compare the least-available
bandwidth figures of the two paths and if the difference exceeds
vRtrMplsGenLeastFillReoptiThd, a trap will be generated to indicate that
a better least-fill path is available for this LSP.