QoS Configuration interface
Click DSCP Mapping 
to enter TOS priority configuration interface
DSCP [0- 63]: The system provides 0~63 TOS priority level. When the IP packet is received, the system will check the TOS level value in the IP packet that has received. For example: user set the TOS level 25 is high. The port 1 is following the TOS priority policy. When the packet received by port 1, 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
Priority: Select the priority level – high, medium, low, or normal
And then, click
Apply |
to apply the configuration
Or, Click
Refesh 
to reset the configuration before applying
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