LevelOne GSW-1676, User Manual, Page: 95 / 150

Q
O
S S
ETTINGS
6-47
Custom if you want to set each value individually.
Note that end-stations, like PCs, are not usually VLAN aware, so they do
not create VLAN-tagged frames. As a result, 802.1p is not an ideal
method to use when there are a lot of PCs connected to the switch.
• DSCP – 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 are shown below. Note that all the
DSCP values not specified are mapped to the normal 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.
Web – Click QOS, Settings. In QoS Mode, select QoS Disabled, 802.1p, or
DSCP to configure the related parameters.
Mapping DSCP Priorities to Egress Queues
IP DSCP Value
Egress Queue
8, 10, 12, 14, 16 low
0, 18, 20, 22, 24 normal
26, 28, 30, 32, 34, 36, 38, 40, 42 medium
46, 48, 56 high