QoS Requirements of Video

Two main types of video traffic exist: Interactive-Video (videoconferencing) and Streaming-Video (both unicast and multicast). Each type of video is examined separately.

Interactive-Video
When provisioning for Interactive-Video (video conferencing) traffic, the following guidelines are recommended:

  • Interactive-Video traffic should be marked to DSCP AF41; excess videoconferencing traffic can be marked down by a policer to AF42 or AF43.
  • Loss should be no more than 1 percent.
  • One-way latency should be no more than 150 ms.
  • Jitter should be no more than 30 ms.
  • Assign Interactive-Video to either a preferential queue or a second priority queue (when supported); when using Cisco IOS LLQ, overprovision the minimum-priority bandwidth guarantee to the size of the videoconferencing session plus 20 percent. (For example, a 384-kbps videoconferencing session requires 460 kbps of guaranteed priority bandwidth.)

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