The value of vRtrMplsLspPathSrlg specifies whether the use of
SRLG constraint in the computation of a secondary path for an
LSP at the head-end Label Edge Router (LER) is enabled.
The value vRtrMplsLspPathSrlg is used only when the value of
vRtrMplsLspPathType is 'secondary'. When the value of
vRtrMplsLspPathSrlg is true, the use of SRLG constraint in the
computation of a secondary path is enabled.