QoS Requirements for Video

Key QoS requirements and recommendations for interactive video (video conferencing) traffic:

  • Interactive video traffic should be marked to DSCP AF41; excess video conferencing traffic can be marked down by a policer 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 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 video conferencing session plus 20 percent.

Key QoS requirements and recommendations for streaming video traffic:

  • Streaming video should be marked to DSCP CS4, as designated by the QoS Baseline.
  • Loss should be no more than 5 percent.
  • Latency should be no more than 4 to 5 seconds (depending on the video application’s buffering capabilities).
  • Guaranteed bandwidth (CBWFQ) requirements depend on the encoding format and rate of the video stream.
  • Streaming video is typically unidirectional; therefore, remote branch routers might not require provisioning for streaming video traffic on their WAN or VPN edges (in the direction of branch to campus).
  • Nonorganizational streaming video applications, such as entertainment video content, may be marked as scavenger (DSCP CS1), provisioned in the scavenger traffic class and assigned a minimal bandwidth (CBWFQ) percentage.


End-To-End QoS Network Design: Quality of Service in LANs, WANs, and VPNs


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About Andrew Roderos

Andrew Roderos is an IT professional who specializes in networking, a CCIE hopeful, and forever a student of technology. Technologies that he is mostly interested in are routing and switching, virtualization, data center, and a little bit of network security. Outside of the information technology world, he enjoys reading science fiction books, manga, and photography.