oday Internet traffic is rapidly expanding and also becoming more varied and complex. In particular, we’re seeing an explosion in voice and video applications. Millions regularly use Skype to place calls and go to YouTube to share videos. Services like Hulu and Netflix, which let users watch TV shows and movies on their computers, are growing ever more popular. Corporations are embracing videoconferencing and telephony systems based on the Internet Protocol, or IP. What’s more, people are now streaming content not only to their PCs but also to iPhones and BlackBerrys, media receivers like the Apple TV, and gaming consoles like Microsoft’s Xbox and Sony’s PlayStation 3. Communication and entertainment are shifting to the Net.
But this shift is not without its problems. Unlike e-mail and static Web pages, which can handle network hiccups, voice and video deteriorate under transmission delays as short as a few milliseconds. And therein lies the problem with traditional IP packet routers: They can’t guarantee that a YouTube clip will stream smoothly to a user’s computer. They treat the video packets as loose data entities when they ought to treat them as flows.
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