Index into the mplsTunnelCHopTable that identifies the
explicit path for this destination of the P2MP tunnel.
This path is based on the chosen configured path identified
by cmplsTeP2mpTunnelDestHopTableIndex and
cmplsTeP2mpTunnelDestPathInUse, but may have been modified
and automatically updated by the agent when computed hops
become available or when computed hops get modified.
If this destination is the destination of the 'first S2L
sub-LSP' then this path will be signaled in the Explicit
Route Object. If this destination is the destination of a
'subsequent S2L sub-LSP' then this path will be signaled in
a Secondary Explicit Route Object.