Configuration Guide     438
Configuring QoS DiffServ Configuration
Follow these steps to configure the DSCP priority:
1)  Enable DSCP Priority and click Apply. DSCP Priority is disabled by default.
2)  Configure the DSCP-TC mapping relations.
DSCP Select the desired DSCP priority.
DSCP priority represents the DSCP field in the IP packet header. It comprises 6 
bits and the valid values are from 0 to 63.
Note:
The DSCP priority displayed on this page may indicate the DSCP value included in 
the packets or the redefined DSCP value by the ACL Remark feature.
Priority Select a CoS that the DSCP priority will be mapped to. 
The packets are firstly mapped to CoS, then to TC queues according to the CoS-
id-TC mapping relations.
3)  Click Apply.
Configuring Port Priority
Note:
In port priority mode, the packets are firstly mapped to CoS, then to TC queues according to the 
CoS-id-TC mapping relations. Go to QoS > DiffServ > 802.1P Priority and check the CoS-id-TC 
mapping relations before configuring port priority.
For T1600G-18TS, the packets are directly mapped to TC queues in port priority mode.