D-Link DWL-8600AP Administration Guide - Page 94

D-Link UAP Software User Manual 12/10/09 CREATING A DIFFSERV CLASS MAP The Client 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. However, on applications with strict timing requirements, such as voice or multimedia, any degradation of service has undesirable effects. By classifying the traffic and creating policies that define how to handle these traffic classes, you can make sure that timesensitive traffic is given precedence over other traffic. DEFINING DIFFSERV To use DiffServ for Client QoS, use the Class Map and Policy Map pages to define the following categories and their criteria: • Class: create classes and define class criteria • Policy: create policies, associate classes with policies, and define policy statements Once you define the class and associate it with a policy, apply the policy to a specified VAP on the VAP QoS Parameters page. 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 multiple 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. DiffServ is supported for IPv4 and IPv6 packets. Use the Class Map page to add a new Diffserv class name, or to rename or delete an existing class, and define the criteria to associate with the DiffServ class. To configure a DiffServ Class Map, click the Class Map tab. Note: The Class Map page displays the Match Criteria Configuration fields only if a Class Map has been created. To create a Class Map, enter a name in the Class Map Name field and click Add Class Map. Page 94 Creating a DiffServ Class Map 34CSFP6XXUAP-SWUM100-D13