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GS700TR Smart Switch Software Administration Manual
5-10 Configuring Quality of Service
v1.0, May, 2008
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.
Configuring 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
Table 5-5. IP DSCP Mapping Configuration Fields
Field Description
DSCP Lists the DSCP values to which you can map an internal traffic class.
The values range from 0-63.
Queue 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
0-7.