DES-3028 DES-3028P DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch
802.1p User Priority
When using 802.1p priority mechanism, the packet is examined for the presence of a valid 802.1p priority tag. If the tag is present,
the packet is assigned to a programmable egress queue based on the value of the tagged priority. The tagged priority can be
designated to any of the available queues.
The Switch allows the assignment of a class of service to each of the 802.1p priorities. In the CoS folder, click 802.1p User
Priority to view the window 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.
CoS 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 CoS folder, click CoS Scheduling Mechanism, to view the window shown below.
Figure 8- 5. CoS Scheduling Mechanism and CoS Scheduling Mechanism Table window
NOTICE: The default CoS 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.
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