I recently participated in a panel at Carrier Cloud 2012 and also gave a talk on scalable networking in Apache CloudStack. I put the presentation here: http://www.slideshare.net/chiradeep_v/scalable-networking-in-apache-cloudstack
Please pay attention to the "notes" below the presentation — the presentation is mostly images without text (there's a tab for comments and a tab for Notes). The conference was mostly attended by grizzled veterans of the networking world (think BGP, MPLS, etc) that have been writing RFCs and doing complicated IP networking stuff for the carrier world. Noted folks there were David Ward (Cisco), Prodip Sen (Verizon), Kireeti Kompella (Juniper), Bruce Davie (Nicira), Yakov Rekhter (Juniper). Clearly I was not in the same league :). Interestingly there was a lot of skepticism about SDN (from the vendor side mostly). But my presentation was well received, mostly because they got some insight into how a cloud used and deployed in Apache CloudStack Most folks on the carrier side had only vaguely heard of CloudStack — they were mostly from the packet engineering side, so that is excusable :) By far the most interesting talk was from Microsoft — Parantap Lahiri described how they use L3 networking with NVGRE overlays throughout their data centers along with host-based firewalls and virtual loadbalancers. This dovetails somewhat with the scaling approaches we use in Apache CloudStack. -- Chiradeep
