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CHAPTER 5: WEB MANAGEMENT
QoS DSCP
FIGURE 5-17. QOS CONFIGURATION SCREEN
In DSCP mode, packets are prioritized using the DSCP (Differentiated Services Code Point) value. The Differentiated Services Code
Point (DSCP) is a six-bit field that is contained within an IP (TCP or UDP) header. The six bits allow the DSCP field to take any value
in the range 0–63. When QoS Mode is set to DSCP, the DSCP Configuration table is displayed, allowing you to map each of the DSCP
values to a hardware output queue (low, normal, medium or high). The default settings map all DSCP values to the high priority egress
queue.
You can use the Prioritize Traffic drop-down list to quickly set the values in the DSCP Configuration table to a common priority queue.
Use Custom if you want to set each value individually.
When the QoS Mode is set to DSCP, the DSCP Configuration table is displayed.
Strict: Services the egress queues in sequential order, transmitting all traffic in the higher priority queues before servicing lower priority
queues.
WRR: Weighted Round-Robin shares bandwidth at the egress ports by using scheduling weights with default values of 1, 2, 4, 8 for queues 0
through 7, respectively. (This is the default selection.)
NOTE: WRR can only be selected if Jumbo Frame mode is disabled on the Port Configuration page.
