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6.9 QoS
Quality of Service (QoS) is the ability to provide different priority to different
applications, users or data flows, or to guarantee a certain level of performance to a
data flow. QoS guarantees are important if the network capacity is insufficient,
especially for real-time streaming multimedia applications such as voice over IP or
Video Teleconferencing, since these often require fixed bit rate and are delay
sensitive, and in networks where the capacity is a limited resource, for example in
cellular data communication. In the absence of network congestion, QoS
mechanisms are not required.
6.9.1 QoS Policy
Using the weight fair queue scheme
tThe switch will follow 8:4:2:1 rate to process priority queue from High to lowest
queue. For example, while the system processing,1 frame of the lowest queue, 2
frames of the low queue, 4 frames of the middle queue, and 8 frames of the high
queue will be processed at the same time in accordance with the 8,4,2,1 policy rule.
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