Setting the value of vRtrMplsLspAdaptive to 'true' enables
make-before-break functionality for the LSP. When the attributes
of an already established LSP are changed, either through manual
configuration or due to a change in network topology,
make-before-break functionality ensures that the resources of
the existing LSP will not be released until a new path (with the
same LSP Id) has been established and traffic flowing over the
existing path is seamlessly transferred to the new path.
Setting the value to 'false' disables make-before-break
functionality.