The value of vRtrMplsP2mpInstAdaptive specifies whether
make-before-break functionality is enabled. If the value of
vRtrMplsP2mpInstAdaptive is set to 'true', it enables make-before-break
functionality for the P2MP LSP.
When the attributes of an already established P2MP 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 P2MP LSP will not be released until a new path (with the
same P2MP LSP Id) has been established and traffic flowing over the
existing path is seamlessly transferred to the new path.
If the value of vRtrMplsP2mpInstAdaptive is set to 'false', it
disables make-before-break functionality.