I have always thought that QOS really doesn't apply until there is congestion, I've also heard that you should limit the speed on your egress ports to be just under the speed of the pipe (such as Metro E) so congestion will happen at the device you control and QOS will take effect.
However, after reading a post on Reddit https://www.reddit.com/r/networking/comments/8e4l0w/how_does_this_sub_really_feel_about_sdwan/
A point was made by someone who seemed to know what they were talking about that QOS applies all the time regardless of congestion. Is this true? If so how is this possible if the queues are empty?
Thanks!
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