Qos Advanced Mode - Dell PowerConnect 5500 Series System User's Manual

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QoS Advanced Mode

This section describes QoS Advanced mode.
It contains the following topics:
• Advanced Mode Overview
• Workflow to Configure Advanced QoS Mode
• DSCP Mapping
• Class Mapping
• QoS Policers
• Policy Binding
Advanced Mode Overview
In Advanced mode, the switch uses policies to support per-flow QoS. A policy
and its components have the following characteristics and relationships:
• A policy contains one or more class maps.
• A class map defines a flow with one or more associated ACLs. Packets that
match the ACL rules (ACEs) in a class map with Permit (forward) action,
belong to the same flow, and are subject to the same quality of service
action. A policy can contain one or more flows, each with a user-defined
QoS action.
• The QoS of a class map (flow) may be enforced by the associated policer.
There are two type of policers, as described in "Defining Class Mapping
Using CLI Commands" on page 685.
• Per-flow QoS actions are applied to flows by binding the policy maps to the
desired ports. A policy map and its class maps can be bound to one or more
ports, but each port is bound with, at the most, one policy map.
The following points should be considered:
• An ACL can be configured to one or more class maps, regardless of
policies.
• A class map can belong to only one policy map.
• When a class map, using a single policer, is bound to multiple ports, each
port has its own instance of the policer. Each instance applies the QoS
actions on the class map (flow) at a port independent of each other.
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