Dell PowerConnect 5524P User Manual page 642

This is the default QoS mode.
• Advanced Mode — Per-flow Quality of Service (QoS).
In Advanced mode, a per-flow QoS consists of a class map and a policer:
– A class map defines the kind of traffic in a flow, and contains one or
more ACLs. Packets that match the ACLs belong to the flow.
– A policer applies the configured QoS to a flow. The QoS configuration
of a flow may consist of the egress queue, the DSCP or CoS value, and
actions on out-of-profile (excess) traffic.
• Disable Mode (QoS is not enabled)
In this mode, all traffic is mapped to a single best-effort queue, so that no
type of traffic is prioritized over another.
Only a single mode can be active at a time. When the system is configured to
work in QoS Advanced mode, settings for QoS Basic mode are not active and
vice versa.
When the QoS mode is changed, the following occurs:
• When changing from Advanced mode to any other mode, policy profile
definitions and class maps are deleted. ACLs, which are bonded directly to
interfaces, remain bonded.
• When changing from Basic mode to Advanced mode, the QoS Trust mode
configuration in Basic mode is not retained.
• When disabling QoS, the shaper and queue setting (WRR/SP bandwidth
settings) are reset to default values.
All other user configurations remain intact.
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Dell PowerConnect 55xx Systems User Guide