User manual

QoS Configuration
Here you can configure Qos policy and priority setting, port priority setting, COS and TOS setting.
QoS Policy
•
Qos Policy:
Select the QoS policy rule.
¾ Use an 8,4,2,1 weighted fair queuing scheme: The switch will follow 8:4:2:1 rate to process
priority queue from High to lowest queue. For example, while the system processes, 1 frame of
the lowest queue, 2 frames of the low queue, 4 frames of the middle queue, and 8 frames of the
high queue will be processed at the same time in accordance with the 8,4,2,1 policy rule.
¾ Use a strict priority scheme: Always the higher queue will be processed first, except the
higher queue is empty.
¾
Priority Type:
There are 5 priority type selections available—
Port-based
,
TOS only
,
COS
only
,
TOS first
, and
COS first
. Disable means no priority type is selected.
•
Click
Apply
button to make the settings effective.
Priority Type
•
There are 5 priority type options available—
Port-based
,
TOS only
,
COS only
,
TOS first
, and
COS
first
.
•
Click
Apply
to have the settings taken effect.
Default Port Priority
•
There are four options for port priority—
High
,
Middle
,
Low
, and
Lowest
.
•
Click
Apply
to have the settings taken effect.
COS Configuration
Set up the COS priority level.
•
Priority:
Set up the COS priority level 0~7—High, Middle, Low, Lowest.
•
Click
Apply
.
TOS Configuration
Set up the TOS priority.
•
Priority:
The system provides 0~63 TOS priority level. Each level has 4 types of priority—High, Middle,
Low, and Lowest. The default value is ‘Lowest’ priority for each level. When the IP packet is received,
the system will check the TOS level value in the IP packet that has received. For example, the user
sets the TOS level 25 as high, the system will check the TOS value of the received IP packet. If the
TOS value of received IP packet is 25 (priority = high), and then the packet priority will have highest
priority.
•
Click
Apply
to make the settings take effect.
53 Chapter3