Just to clarify CityLink's position on the matters raised in this thread:

CityLink's efforts toward developing an SDN-based internet exchange platform have been primarily research focussed to date. There has been a lot of knowledge gained during this process on the capabilities (and limitations) of SDN and the impact it could have on the future of the telecommunication industry in New Zealand.  While some gains have been made, the project/development is still in its infancy and there is no plan to put SDN into production on any of the existing NZIX exchange points or other locations in CityLink���s network at the current time.  Any possible introduction of SDN technology down the track into the NZIX would only follow (a) extensive engagement with the NZNOG community/stakeholders on the operational matters raised, and (b) a satisfactory "pre-production trial" for interested parties, in order to adequately test the SDN platform and seek feedback on its implementation.

CityLink hasn't been focussing solely on SDN development, however. Over the last two years we've made considerable investments in new hardware at APE and WIX, increasing the capacity and stability of the NZIX switching fabric and the supporting infrastructure (route servers). We've also progressed the migration of the last remaining wholesale ISP customers out of the NZIX peering LANs, thereby enabling the compilation of aggregate traffic graphs for the exchanges which have been difficult to produce historically. On that note, CityLink is happy to advise that aggregate traffic graphs for APE and WIX are now available at http://www.nzix.net