[c-nsp] LDPv6 Census Check

[Robert Raszuk]

>
> I'm not sure why this deep label stack keeps popping, if we need
> multiple levels of tunneling, we need it in IP too, and it's almost
> more expensive in IP.
>

Well imagine you need only one level of tunneling but rich ECMP.

Then with IP encap (even MPLS app demux carried in UDP) you just make sure
src UDP port is random and voila works very nicely.

In contrast to achieve the same with MPLS you need Entropy label (which is
two - first the marker/indicator and then the actual value) + hardware
capable of reading it.

R.