A QoS class determines the priority and bandwidth for
traffic matching a QoS
Policy rule. You can use a QoS Profile rule
to define QoS classes. There are up to eight definable QoS classes
in a single QoS profile. Unless otherwise configured, traffic that
does not match a QoS class is assigned a class of 4.
Priority Queuing and QoS
Bandwidth Management, the fundamental mechanisms of a QoS
configuration, are configured within the QoS class definition (see
Step Add a QoS profile rule.). For each QoS class,
you can set a priority (real-time, high, medium, and low) and the
maximum and guaranteed bandwidth for matching traffic. QoS priority
queuing and bandwidth management determine the order of traffic
and how traffic is handled upon entering or leaving a network.