Index into the mplsTunnelARHopTable that identifies the
actual hops traversed to this destination of the P2MP
tunnel. This is automatically updated by the agent when the
actual hops becomes available.
If this destination is the destination of the 'first S2L
sub-LSP' then this path will be signaled in the Recorded
Route Object. If this destination is the destination of a
'subsequent S2L sub-LSP' then this path will be signaled in
a Secondary Recorded Route Object.