Transition Networks SISPM1040-182D - Manual (Page 105)

Transition Networks SISPM1040-182D
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6.21 QoS Configuration
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.
6.21.1 QoS Policy and Priority Type
Here you can choose to use an 8-4-2-1 queuing scheme or a strict priority scheme, or
select the priority type to configure QoS policy.
„ Qos Policy: Select the QoS policy rule.
¾ Using the 8,4,2,1 weight fair queue scheme: The 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.
¾ Use a strict priority scheme: Always the higher queue will be processed first,
except the higher queue is empty.
¾ Priority Type: There are 5 priority type selections available—Port-based, TOS
only, COS only, TOS first, and COS first. Disable means no priority type is
selected.
„ Click Apply to have the configuration take effect.