802.1P User Priority; Scheduling - D-Link DES-3550 User Manual

DES-3550 Layer 2 Fast Ethernet Switch User's Guide

802.1p User Priority

The DES-3550 allows the assignment of a user priority to each of the 802.1p priorities. In the
Configuration folder open the QoS folder and click 802.1p User Priority, to view the screen
shown below.
Figure 6- 30. QoS Class of Traffic window
Once you have assigned a priority to the port groups on the Switch, you can then assign this
Class to each of the 4 levels of 802.1p priorities. Click Apply to set your changes.

Scheduling

QoS can be customized by changing the output scheduling used for the hardware queues in
the Switch. 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
Configuration folder open the QoS folder and click QoS Output Scheduling, to view the
screen shown below.
Figure 6- 31. QoS Output Scheduling Configuration window
You may assign the following values to the QoS classes to set the scheduling.
Parameter Description
Max. Packets(0-255) Specifies the maximum number of packets the above specified hardware
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