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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
195
QoS Scheduling Mechanism
Changing the output scheduling used for the hardware queues in the Switch can customize QoS. As with any changes to QoS
implementation, careful consideration should be given to how network traffic in lower priority queues is affected. Changes in
scheduling may result in unacceptable levels of packet loss or significant transmission delay. If you choose to customize this
setting, it is important to monitor network performance, especially during peak demand, as bottlenecks can quickly develop if the
QoS settings are not suitable. In the QoS folder, click QoS Scheduling Mechanism, to view the window shown below.
Figure 9- 3. QoS Output Scheduling window
The Scheduling Mechanism has the following parameters.
Parameter Description
Strict
The highest class of service is the first to process traffic. That is, the highest class of service
will finish before other queues empty.
Weight Robin
Use the weighted round-robin (WRR) algorithm to handle packets in an even distribution in
priority classes of service.
Click Apply to implement changes made.
NOTE: The settings you assign to the queues, numbers 0-7, represent the IEEE
802.1p priority tag number. Do not confuse these settings with port numbers.