Advantech EKI-2748FI, User Manual

Page: 91 / 115

QoS Configuration
Here you can configure Qos policy and priority setting, per port priority setting, COS and TOS setting.
QoS Policy and Priority Type
•
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 processing, 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 to have the settings take effect.
Port Base Priority
Configure the priority level for each port. With the drop-down selection item of
Priority Type
above being
selected as Port-based, this control item will then be available to set the queuing policy for each port.
•
Port x:
Each port has 4 priority levels—High, Middle, Low, and Lowest—to be chosen.
• Click Apply to have the settings taken effect.
COS Configuration
Set up the COS priority level. With the drop-down selection item of
Priority Type
above being selected
as COS only/COS first, this control item will then be available to set the queuing policy for each port.
•
COS priority:
Set up the COS priority level 0~7—High, Middle, Low, Lowest.
•
Click Apply .
TOS Configuration
Set up the TOS priority. With the drop-down selection item of
Priority Type
above being selected as TOS
only/TOS first, this control item will then be available to set the queuing policy for each port.
•
TOS 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.
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