Running Cisco VCS with mulitple Video End Points with multiple remote locations. I'm setting up the QOS for Video on the Routers and wanted to confirm a couple things. I've seen many posts regarding Video QOS but it seems each answer varies. Below is the sample config I was going to use. Should I be using a differnt class-map for dscp EF. What is the recommended bandwidth I should be using for Video QOS. Any suggestions on this would be helpful. THanks
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Should I be using a differnt class-map for dscp EF. What is the recommended bandwidth I should be using for Video QOS. Any suggestions on this would be helpful. THanks
Your class-map for DSCP EF (Video-RTP) doesn't have anything defined?
You can use any marking you like, although there are recommendations for different traffic types (which incidentally are slightly different between RFCs and Cisco). I would advise using either RFC or Cisco marking recommendations.
How the bandwidth is managed, when there's congestion, is the real key to effective QoS policies. (Markings are just a short cut to ease identification of different traffic kinds.)
What bandwidth you should use for Video depends on the video source's bandwidth requirements, its codec and whether it's real-time or streaming video. In general, often video is very variable in its short term bandwidth usage, so you either want to allocate excessive bandwidth so it doesn't need to buffer (approach for real-time video) or you need to insure there's sufficient buffering (approach for streaming video).
Real-time video might be placed in LLQ or PQ, although this risks such traffic being adverse to some other real-time traffic like VoIP bearer. If LLQ or PQ isn't being used, then a high bandwidth ratio might be defined to insure prompt attention from the scheduler.
For streaming video, bandwidth might be defined slightly above the nomimal/average bandwidth expectation, again, though, insure there's sufficient buffering.
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