re: SDN Skirmish: Physical, Virtual Approaches Vie For Dominance
There are a couple of other considerations for overlays that probably don't rise to the level of detractor but rather talk to the need for these overlays to communicate with the physical network underneath.
Imagine two overlays (or even two flows in a single overlay). Ultimately things will break down to packets on a wire. How does the physical network know which packet gets priority with these two?
This is a simplistic example obviously. But the point is that overlays will eventually need to be pinned to physical networks. This speaks less to one vs. the other and more to the need for active collaboration between the two.
I think some of the more genuine dialogue on overlays and physical networks is starting to embrace this a bit more. Once we get past some of the marketing FUD, cooler minds usually prevail :)
-Mike Bushong (@mbushong)