SDN has progressed so far over the last couple of years that customers are no longer asking ‘what?’ but ‘how?’, says Sunil Khandekar, CEO and founder of Nuage Networks. He tells Martyn Warwick that there’s a big disruption coming – for vendors especially – and that the best way to cope is to embrace Openflow and open source generally. Trying to build lock-in on top of open source technology would be self-defeating.