3com MSR 20-20 참조 매뉴얼

By default, the dropping method of a queue is tail drop.

qos wfq, display qos wred interface.

# Enable WRED on Ethernet 1/0, using IP precedence for calculating the drop 
probability.

<Sysname> system-view

[Sysname] interface ethernet1/0

[Sysname-Ethernet1/0] qos wfq queue-length 100 queue-number 512

[Sysname-Ethernet1/0] qos wred ip-precedence enable 

qos wred dscp dscp-value low-limit low-limit high-limit high-limit 
discard-probability discard-prob

undo qos wred dscp dscp-value

Interface view

dscp-value: DSCP value, in the range of 0 to 63. This argument can also be a 
keyword listed in Table 479.

low-limit low-limit: Specifies the lower threshold, in the range 1 to 1024 (in terms 
of the number of packets). The system default is 10.

high-limit high-limit: Specifies the upper threshold, in the range 1 to 1024 (in 
terms of the number of packets). The system default is 30.

discard-probability discard-prob: Specifies the denominator for drop probability, 
in the range 1 to 255. The system default is 10.

Use the qos wred dscp command to set the lower threshold, the higher 
threshold, and drop probability denominator for a specific DSCP value.

Use the undo qos wred dscp command to restore the default.

Before performing this configuration, make sure that the qos wred dscp enable 
command is used to apply DSCP-based WRED to the interface. The thresholds limit 
the average queue length.

qos wred enable, display qos wred interface.

# Configure the following parameters for packets with the DSCP value 63: lower 
threshold 20, higher threshold 40, and drop probability denominator 15.

<Sysname> system-view

[Sysname] interface ethernet 1/0

[Sysname-Ethernet1/0] qos wfq queue-length 100 queue-number 512

[Sysname-Ethernet1/0] qos wred dscp enable