Web Browsing Applications; File Server Applications; Configuring Qos For A Port Or Vlan - Extreme Networks Summit 300-48 Software User's Manual

Web Browsing Applications

QoS needs for Web browsing applications cannot be generalized into a single category. For example,
ERP applications that use a browser front-end may be more important than retrieving daily news
information. Traffic groupings can typically be distinguished from each other by their server source and
destinations. Most browser-based applications are distinguished by the dataflow being asymmetric
(small data flows from the browser client, large data flows from the server to the browser client).
An exception to this may be created by some Java
applications are generally tolerant of latency, jitter, and some packet loss, however small packet-loss
may have a large impact on perceived performance due to the nature of TCP. The relevant parameter
for protecting browser applications is minimum bandwidth. The relevant parameter for preventing
non-critical browser applications from overwhelming the network is maximum bandwidth. In addition,
RED can be used to reduce session loss if the queue that floods Web traffic becomes over-subscribed.

File Server Applications

With some dependencies on the network operating system, file serving typically poses the greatest
demand on bandwidth, although file server applications are very tolerant of latency, jitter, and some
packet loss, depending on the network operating system and the use of TCP or UDP.
NOTE
Full-duplex links should be used when deploying policy-based QoS. Half-duplex operation on links can
make delivery of guaranteed minimum bandwidth impossible.
Table 64 summarizes QoS guidelines for the different types of network traffic.
Table 64: Traffic Type and QoS Guidelines
Traffic Type
Voice
Video
Database
Web browsing
File server

Configuring QoS for a Port or VLAN

Table 65 lists the commands used to configure QoS.
Table 65: QoS Configuration Commands
Command
config ports <portlist> qosprofile <qosprofile>
config vlan <name> qosprofile <qosprofile>
Summit 300-48 Switch Software User Guide
™ -based applications. In addition, Web-based
Key QoS Parameters
Minimum bandwidth, priority
Minimum bandwidth, priority, buffering (varies)
Minimum bandwidth
Minimum bandwidth for critical applications, maximum
bandwidth for non-critical applications, RED
Minimum bandwidth
Description
Configures one or more ports to use a
particular QoS profile.
Allows you to configure a VLAN to use a
particular QoS profile.

Configuring QoS for a Port or VLAN

163