I've been under the assumption that all QoS policies are only applied during periods of congestion. That is to say that my cbwfq is only applied during times of congestion. That makes sense to me, since tail dropping only occurs during congestion, and wfq would only kick in during times of congestion. But what about policing and shaping? Are they exceptions, or are they too only put into effect during periods of congestion? If I have a class map catching napster traffic and have it policed, does that policing only occurr when the output queue is full? Would someone be able to use 80 percent of the bandwidth on a T1 for napster traffic if there wasn't any other traffic in that pipe? Shaping makes even less sense. I can't think of how shaping would be beneficial only during times of congestion. If i want to shape traffic from a central site with 3mb bandwdith down to 1.5mb of bandwidth when sending to a spoke with only 1.5 mb of bandwidth, I would think that is useful all the time. Anyone offer any clarification?