Digisol DG-FS4528P, Management Manual

Page: 367 / 973

C
HAPTER
15 | Class of Service
Layer 2 Queue Settings
– 367 –
If the output port is an untagged member of the associated VLAN,
these frames are stripped of all VLAN tags prior to transmission.
P
ARAMETERS
These parameters are displayed:
Default Priority – The priority that is assigned to untagged frames
received on the specified interface. (Range: 0-7; Default: 0)
Number of Egress Traffic Classes – The number of queue buffers
provided for each port.
W
EB
I
NTERFACE
To configure the queue mode:
1. Click Priority, Default Port Priority.
2.
Modify the default priority for any interface.
3. Click Apply.
Figure 184: Setting the Default Port Priority
M
APPING
C
O
S V
ALUES
TO
E
GRESS
Q
UEUES
Use the Priority > Traffic Classes page to specify which of the hardware
output queues to use for Class of Service (CoS) priority tagged traffic.
The switch processes priority tagged traffic by using four priority queues
for each port, with service schedules based on strict priority or Weighted
Round-Robin (WRR). Up to eight traffic priorities are defined in the IEEE
802.1p standard. Default priority levels are assigned according to
recommendations in IEEE 802.1p as shown in the following table.
The priority levels recommended in the IEEE 802.1p standard for various
network applications are shown in Table 29 . However, priority levels can be
Table 28: IEEE 802.1p Egress Queue Priority Mapping
Priority 0 1 2 3 4 5 6 7
Queue 1 0 0 1 2 2 3 3