Configuring VideoStream – Part 2

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VideoStream

VideoStream provides efficient bandwidth utilization by removing the need to broadcast multicast packets to all WLANs on the AP regardless if there is a client joined to a multicast group.


In order to get around this limitation, the AP needs to be able to send multicast traffic to the host via Unicast forwarding, only on the WLAN that the client is joined and do so at the data rate the client is joined at.


Stream Admission and Prioritization

As mentioned earlier while video is an efficient, high-impact means of communication, it is also very bandwidth intensive, and as is seen, not all video content is prioritized the same. From earlier discussion it is clear that organizations investing in video cannot afford to have network bandwidth consumed without any prioritization of business critical media.
Stream admission will empower the network administrator to have control over all the multicast video streaming in the network. Stream admission will facilitate network administrator to use pre-defined templates for input multicast streams. There are few predefined templates for stream bandwidths of 300Kbps, 500Kbps, 1Mbps, 3Mbps and 5
Mbps.

It is necessary to have a basic understanding of streaming video characteristic before configuring. For example, consider the above two configurations. If the video bit rate is around 4Mbps you need to manually add the configurations instead of using any of the above two templates. If Stream-Less3Mbps is used, the quality of video will be bad due missing video frames. It is observed there is pixelation of video and constant freeze of video on a wireless client.

If Stream-Less5Mbps is used, the number of video clients will be less as every wireless client is guaranteed of 5Mbps while the video bitrate is only 4 M bits. If you had ten wireless I clients the aggregate client bandwidth
should be around 40Mbps. Using the Stream-Less5Mbps the controller will be using 50Mbps, hence depriving 3 wireless clients of video.

Stream Priority can configure the media stream with different priority based on importance within the enterprise network. RRC Priority comes to play only when there is acongestion or contention in the wireless access point.
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