[Iccrg] Explicit feedback

[Michael Welzl]

> Would a former router vendor do?

Sure  :-)

 
> verifiability perspective.  Any in-band packet modifications (e.g., RFC
> 3168 ECN) are problematic because packet header examination and
> modification is typically done on the ingress side of the router, prior
> to the actual switching of the packet.  For scalability reasons,
> maintaining full active queue state on the input side of the system is
> challenging, as the queues only truly exist on the output side.

This part interests me: why is this a problem?
Is it because separate hardware pieces are involved on the ingress
and egress side, where every such piece (chip) would do all the
necessary work for one link only?

I have no idea about router hardware design, I'm just guessing.

Cheers,
Michael