1. I've multiple remote sites running 2811 routers with QoS enabled for the serial interfaces. Hanging from the routers are either Catalyst 3550 or 3560 switches. My question is that since the QoS is already enabled in the router, does the QoS need to be enabled and configured in the switches too?
2. I also have a Catalyst 6509 running QoS. Hanging off it are some 3560 switches connected via fiber link. Should QoS also be enabled on the 3560s?
Any real benefits of having QoS enabled in both router and switches...?
Your input is greatly appreciated.