When there is no path in the LSP with vRtrMplsLspPathType
value of 'primary', 'secondary' type paths of this LSP
with the same value of vRtrMplsLspPathPreference are used
for load sharing. When a 'primary' type path exists in
the LSP, vRtrMplsLspPathPreference is used to denote at
which priority one 'secondary' path will supercede another
when the 'primary' fails. 1 indicates the highest priority
value.
For LSP with vRtrMplsLspPathType value of 'standby' type paths
the value of vRtrMplsLspPathPreference is in the range of (1..255).
For path type 'primary' the value of vRtrMplsLspPathPreference
is set to 0. For path type 'secondary' the value of vRtrMplsLspPathPreference
is set to 255.