Configuring Differentiated Services; Defining Diffserv; Diffserv Configuration - D-Link DWS-4026 User Manual

D-Link Unified Access System
C D
ONFIGURING
The QoS feature contains Differentiated Services (DiffServ) support that allows traffic to be classified into streams and given
certain QoS treatment in accordance with defined per-hop behaviors.
Standard IP-based networks are designed to provide "best effort" data delivery service. "Best effort" service implies that the
network delivers the data in a timely fashion, although there is no guarantee that it will. During times of congestion, packets
may be delayed, sent sporadically, or dropped. For typical Internet applications, such as e-mail and file transfer, a slight
degradation in service is acceptable and in many cases unnoticeable. Conversely, any degradation of service has
undesirable effects on applications with strict timing requirements, such as voice or multimedia.
D D S
EFINING IFF ERV
To use DiffServ for QoS, the web pages accessible from the Differentiated Services menu must first be used to define the
following categories and their criteria:
1 Class: Create classes and define class criteria.
2 Policy: Create policies, associate classes with policies, and define policy statements.
3 Service: Add a policy to an inbound interface
Packets are classified and processed based on defined criteria. The classification criteria is defined by a class. The
processing is defined by a policy's attributes. Policy attributes may be defined on a per-class instance basis, and it is these
attributes that are applied when a match occurs. A policy can contain multiples classes. When the policy is active, the actions
taken depend on which class matches the packet.
Packet processing begins by testing the class match criteria for a packet. A policy is applied to a packet when a class match
within that policy is found.
The Differentiated Services menu page contains links to the various Diffserv configuration and display features.
To display the page, click LAN > QoS > Differentiated Services in the navigation menu. The Differentiated Services menu
page contains links to the following features:
•

"Diffserv Configuration"

• "Class Configuration"
• "Policy Configuration"
• "Policy Class Definition"
• "Service Configuration"
D C
IFFSERV ONFIGURATION
Packets are filtered and processed based on defined criteria. The filtering criteria is defined by a class. The processing is
defined by a policy's attributes. Policy attributes may be defined on a per-class instance basis, and it is these attributes that
are applied when a match occurs.
The configuration process begins with defining one or more match criteria for a class. Then one or more classes are added
to a policy. Policies are then added to interfaces.
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Configuring Differentiated Services

IFFERENTIATED
S
ERVICES
Software User Manual
Document 34CSFP6XXUWS-SWUM100-D7
12/10/09