Teenagers. Maybe you have one (or more) at home; maybe not. But we’ve all been one, so I know you can relate. Moody and unpredictable. Overly sensitive. Taking up more space than any human has a right to. High maintenance. They’re just so adorable.
Well, it turns out we have an exploding data type on our networks that behaves much the same way – IP video. In a recent whitepaper by Cisco, it was reported that all forms of video (TV, VoD, Internet, and P2P) will be approximately 90% of the global consumer Internet traffic by 2015. And per the report, that’s 90% of what will be 966 exabytes, or nearly a zettabyte, of IP data. To see what that looks like graphically, check out this link. Although video traffic on the enterprise side will not be as heavy as that on the consumer Internet, it will increase dramatically nonetheless, and will certainly be much more than 50% of the enterprise network traffic by 2015. It looks like you’re going to need both network management and high school guidance counselor skills by 2015 to manage enterprise networks.
With this dramatic increase in video traffic, video will be in competition with enterprise corporate data, enterprise application access, SaaS, and cloud computing. And given its tendency towards teenage behavior, you’re going to have your hands full. Below are a few details of how the characteristics of IP video can adversely affect your enterprise network.
Video is “bursty,” or in the teenage analogy, unpredictable, which is an undesirable characteristic for networks that work best under stable conditions – predictable and consistent. Packet sizes range all over the place, and often hit the network in large bursts. And of course these bursts are tagged with high QoS (quality of service) tags, so they take precedence over your other mission critical application data. Characterization of your IP video traffic, including weeding out business traffic from surfing, is critical to the health of your enterprise network.
Video is a bandwidth hog. One HD video stream can consume up to 20Mbps of bandwidth. So if five people are trying to stream a movie, it means that they are taking up 100Mbps of your network. This may not seem like a ton of traffic, but depending on the distribution of these users on your network, and the number of users serviced, bandwidth availability can certainly become an issue. And remember, the amount of video on your network is increasing all the time.
Video is also very sensitive to latency, jitter and packet loss, even more so than voice, which we covered in this blog post. These sensitive protocols demand that your network is performing at its peak level to ensure that these issues are minimized. As video becomes more common on the network, performance demands will continue to grow and become harder to reach. Specific metrics and demands of latency, jitter, and packet loss are described in more detail below with this video segment and graph:
Due to the high performance demands of video, it is typically tagged for the highest QoS delivery as I mentioned earlier. However, as video traffic starts exceeding data traffic, enterprises will need to maintain different quality of service between users or video types since it is self-defeating for most of the traffic on a network to have the highest QoS tagging.
As video continues to grow, or as some might say invade, your enterprise network, it is more important than ever to plan and design your network to carry video. And just as the teenage years pass, the video phase will also pass in time, allowing networks to again hum along in a predictable pattern. That is, until the next disruptive technology come along! In next week’s blog, we’ll be providing some best practices on designing, monitoring, and managing your network to help that teenager grow up.