[c-nsp] LDPv6 Census Check

[David Sinn]

> On Jun 12, 2020, at 11:41 AM, Robert Raszuk <robert at raszuk.net> wrote:
> 
> 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 reality you don't even need to do UDP and consume those extra bytes. All of the commodity pipelines as well as the big-iron ones will look at the inner-header of a IPIP frame for entropy calculations if you configure them to do so. You also have the problem that most of the very high-performance commodity ASIC's are moving away from VXLAN/UDP encap since they are in the middle of the classic core/edge feature split and deem VXLAN as edge.

David