Network Load Control
176
8.4
QoS/Priority
UM Basic Configuration L3P
Release
7.1
12/2011
Description of Strict Priority
With the Strict Priority setting, the device first transmits all data packets
that have a higher traffic class (higher priority) before transmitting a data
packet with the next highest traffic class. The device transmits a data
packet with the lowest traffic class (lowest priority) only when there are no
other data packets remaining in the queue. In worse-case situations, the
device never sends packets with lower priority when a high volume of
higher-priority traffic is queued up for transmission on this port.
In applications that are time- or latency-critical, such as VoIP or video,
Strict Priority enables high-priority data to be sent immediately(see on
page 177 “Maximum bandwidth”).
Description of Weighted Fair Queuing
With Weighted Fair Queuing, also known as Weighted Round Robin
(WRR), the user can assign a minimum or reserved bandwidth to each
traffic class. This ensures that data packets with a lower priority are also
sent when the network is very busy.
The weighting values range from 0% to 100% of the available bandwidth,
in steps of 5%.
A weighting of 0 is equivalent to a "no bandwidth" setting.
The sum of the individual bandwidths may add up to 100%.
If you assign Weighted Fair Queuing to all traffic classes, the entire
bandwidth for the corresponding port is available to you.
When you combine Weighted Fair Queuing with Strict Priority, make sure
that the highest traffic class of Weighted Fair Queuing is smaller than the
lowest traffic class of Strict Priority.
In this case, a high Strict Priority network load can significantly reduce the
bandwidth available for Weighted Fair Queuing.
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