The value of vRtrIfBfdSessExtLspPathId indicates the source path index
for the MPLS-TP LSP path.
notApplicable (0) - Indicates vRtrIfBfdSessExtLinkType is neither
'ccOnly' or 'ccWithCv'.
working (1) - A working path is the primary path for the LSP.
protecting (2) - A protection path is the secondary path for the
LSP.