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Intel
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NetStructure™ 480T Routing Switch User Guide
For example, in the playback of stored video streams, some
applications can transmit large amounts of data for multiple streams
in one spike, with the expectation that the endstations will buffer
significant amounts of video-stream data. This can present a
problem to the network infrastructure, because it must be capable of
buffering the transmitted spikes where there are speed differences
(for example, going from Gigabit Ethernet to Fast Ethernet).
The key QoS parameters for video applications include:
• Minimum bandwidth
• Priority
• Buffering (depending on the behavior of the application)
Critical Database Applications
Database applications, such as those associated with ERP
(enterprise resource planning), typically do not demand significant
bandwidth and are tolerant of delay. You can establish a minimum
bandwidth using a priority less than that of delay-sensitive
applications.
Web Browsing Applications
Use full-duplex links when
deploying policy-based
QoS. Half-duplex operation
on links can make delivery
of guaranteed minimum
bandwidth impossible.
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 those retrieving
daily news information. Traffic groupings can be distinguished
from each other by their server source and destinations.
Most browser-based applications are distinguished by asymmetric
data flow (small data flows from the browser client, large data flows
from the server to the browser client). An exception to this can be
created by some Java
§
applications. In addition, Web-based
applications are generally tolerant of latency, jitter, and some
packet loss. However small, packet-loss can 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.