The value of vRtrMplsTpLsrRPOutLink specifies the reverse path (RP)
LSP out-link interface used by the MPLS-TP LSP Path.
This object can be set only after vRtrMplsTpLsrRPEnabled is set to
'true'.
Once this object is set, this value may not be unset. To remove the
out-link, one must set vRtrMplsTpLsrRPEnabled to 'false'.