QoS Configuration
You can configure Qos policy and priority setting, per port priority setting, COS and TOS setting.
QoS Policy and Priority Type
Oos Policy: select the Qos policy rule.
Using the 8,4,2,1 wnine fair queue scheme: the switch will follow 8:4:2:1 rate
to process priority queue from Hi to lowest queue. For example: the system will process 8 high queue packets, 4 middle queue packets, 2 low queue packets, and the one lowest queue packets at the same time.
Use the strict priority scheme: Always higher queue will be process first, except higher queue is empty.
Priority Type: every port has 5 priority type selections. Disable means no priority type is selected.
COS only: the port priority will only follow the COS priority that you have assigned.
TOS only: the port priority will only follow the TOS priority that you have assigned.
COS first: the port priority will follow the COS priority first, and then other priority rule.
TOS first: the port priority will follow the TOS priority first, and the other priority rule.
Click
Apply 
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