The value of vRtrMplsLspPathOperLeastFill specifies whether
the currently operational LSP path was computed with the least-fill
path selection method.
When make-before-break functionality for the LSP is enabled and if the
LSP least-fill setting is changed, the resources allocated to the
existing LSP paths will not be released until a new path with the new
settings has been established. While a new path is being signaled, the
administrative value and the operational values of the path may
differ. The value of vRtrMplsLspLeastFill specifies the least-fill
setting for the new LSP path trying to be established whereas the
value of vRtrMplsLspPathOperLeastFill specifies the least-fill
setting for the existing LSP path.