QoS – Port Priority
QoS Port Priority
Priority Mapping
Priority mapping is used to realize the conversion between the QoS priority carried in the packet and the internal priority of
the device ( also known as the local priority, which is the priority used by the device to differentiate the service level of the
packet ) so that the device provides the Differentiated QoS service quality. Users can use different QoS priority fields in
different networks according to network planning.
CoS Mapping
Shows the mapping relationship between queues and CoS remarking priorities.
Port Priority Select whether to enable Port Priotiy. (Default is disabled)
Trust Mode
Select the QoS operation mode:
● CoS: Traffic is mapped to queues based on the CoS Queue Mapping, it can configured in QoS →
Priority Mapping → CoS Mappging page.
● DSCP: All IP traffic is mapped to queues based on the DSCP field in the IP header. If the traffic is not
IP traffic, it is mapped to the lowest priority queue.
● CoS-DSCP: All IP traffic is mapped to queues based on the DSCP field in the IP header. If the traffic
is not IP traffic but has VLAN tag, mapped to queues based on the CoS value in the VLAN tag. it can
configured in QoS → Priority Mapping → DSCP Mapping page.
● IP-Precedence: The IP precedence is a 3-bit field in TOS that threats high priority packets as more
important than other packets. it can configured in QoS → Priority Mapping → IP Mapping page.
Edit Port Priority
Port Displays the selected port GE/LAG.
CoS
Set the CoS value of the interface, the value range is an integer from 0 to 7 (7 is the highest priority ), the
default is 0.
Trust Select whether to enable Trust.
Re-marking CoS Set whether to enable Re-marking CoS function of outgoing packets, which is disabled by default.
Re-marking DSCP Set whether to enable Re-marking DSCP function of outgoing packets, and it is disabled by default.
Re-marking IP Precedence
Set whether to enable Re-marking IP Precedence function of outgoing packets, and it is disabled by
default.
Note : Only one of DSCP and IP Precedence re-marking can be enabled.
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