I am intensively preparing for the QoS rollout in my company (I'm a network admin) and I was reading many papers and books about it. Still, there's one thing left to clarify.
Is PQ policed or not? Some books and courses say "yes, definitely, even when there's bandwidth available" and some say that PQ will get the bandwidth above the priority value entered - if it's not taken by the other clasess.
For instance, the book "End to end QoS design" (really great reading, indeed) says that newer IOSes have this feature implemented, so the PQ can take more bandwidth if it's available.
What is the final truth? If the book mentioned is right, can someone tell me from which IOS version that feature is supported?