24-Port Gigabit Ethernet Switch
RGS-1024 User
Manual
-8-
assigned a priority to. The illustration below shows how 802.1p
priority queuing is implemented on the Switch.
Mapping QoS on the Switch
The Switch has four priority queues labeled 0, 1, 2 and 3. The
untagged packets and the eight other IEEE 802.1p priority levels
defined by the standard are mapped to the four class queues
used on the Switch. Among these four priority queues on the
Switch, Class 3 has the highest priority, while Class 0 has the
lowest priority and Class 2 has higher priority compared with
Class 1. The Untagged packets and eight priority tags, specified in
IEEE 802.1p are mapped to the switch’s priority tags as follows:
z
The Untagged packets, priority 1 and 2 are assigned to the
switch’s Class 0 queue.
z
Priority 0 and 3 are assigned to the switch’s Class 1 queue.
z
Priority 4 and 5 are assigned to the switch’s Class 2 queue.
z
Priority 6 and 7 are assigned to the switch’s Class 3 queue.
The Switch uses WRR (Weighted Robin Round) for scheduling.
WRR queue-scheduling algorithm schedules all the queues in
turn and every queue can be assured of a certain service time.
The default value of QoS mode on this Switch is “weight 1:2:4:8”
from Class 0 to Class 3 queue in turn.
