The QoS queuing
features are enabled by default. Specific QoS-type features, such as policing
and marking, are enabled only when a policy is attached to an interface.
Specific policies are enabled when that policy is attached to an interface.
By default, the device
always enables a system default queuing policy, or system-defined queuing
policy map, on each port and port channel. When you configure a queuing policy
and apply the new queuing policy to specified interfaces, the new queuing
policy replaces the default queuing policy, and those rules now apply.
The device enables
other QoS features, policing and marking, only when you apply a policy map to