Netgear GS110TP GS108Tv2/GS110TP Software Reference Manual - Page 152
Differentiated Services, Defining DiffServ
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GS108T and GS110TP Smart Switch Software Administration Manual To map DSCP values to queues: 1. For each DSCP value, select a hardware queue to associate with the value. The traffic class is the hardware queue for a port. Higher traffic class values indicate a higher queue position. Before traffic in a lower queue is sent, it must wait for traffic in higher queues to be sent. Valid range is 0-3. 2. Click Cancel to cancel the configuration on the screen and reset the data on the screen to the latest value of the switch. 3. If you make changes to the page, click Apply to apply the changes to the system. Differentiated Services 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. Defining DiffServ To use DiffServ for QoS, the Web pages accessible from the Differentiated Services menu page 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. 4-10 v1.0, April 2010 Configuring Quality of Service