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DES-3010F/G / DES-3018 / DES-3026 Fast Ethernet Switch Manual

802.1p User Priority

The Switch allows the assignment of a class of service to each of the 802.1p priorities. In the QoS folder, click 802.1p

User Priority to view the screen shown below.

Figure 8- 4. 802.1p User Priority window

Once you have assigned a priority to the port groups on the Switch, you can then assign this Class to each of the four levels

of 802.1p priorities. Click Apply to set your changes.

QoS Scheduling Mechanism

This drop-down menu allows you to select between a Weight Fair and a Strict mechanism for emptying the priority

classes. In the QoS folder, click QoS Scheduling Mechanism, to view the screen shown below.

Figure 8- 5. QoS Scheduling Mechanism and QoS Scheduling Mechanism Table window

NOTICE: The default QoS scheduling arrangement is a strict

priority schedule for the highest class (Class-3) which means the

Switch will consider the highest class of service to have strict

scheduling only, while the other queues empty in a round-robin

method.

The Scheduling Mechanism has the following parameters.

Parameter Description

Strict

Denoting a Strict scheduling will set the highest queue to be emptied first while the

other queues will follow the weighted round-robin scheduling scheme.

Weight fair

Use the weighted round-robin (WRR) algorithm to handle packets in an even

distribution in priority classes of service.

Click Apply to let your changes take effect.

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