This object contains the value of mplsXCIndex, the primary
index of the mplsXCTable for all cross-connect entries for
this P2MP LSP.
If no XC entries have been created yet, this object must
return zero.
The set of entries in the mplsXCTable for this P2MP LSP can
be walked by reading Get-or-GetNext starting with the three
indexes to mplsXCTable set as:
mplsXCIndex = the value of this object
mplsXCInSegmentIndex = 0x0
mplsXCOutSegmentIndex = 0x0