3com MSR 20-20 참조 매뉴얼

C

HAPTER

 115: CBQ C

ONFIGURATION

 C

OMMANDS

dscp: Uses DSCP value for calculating drop probability for a packet.

ip-precedence: Uses IP precedence value for calculating drop probability for a 
packet.

Use the wred command to configure drop mode as Weighted Random Early 
Detection (WRED).

Use the undo wred command to remove the configuration.

This command can be used only after the queue af or queue wfq command has 
been configured. The wred command and queue-length command can not be 
used simultaneously. Other configurations under the random drop will be deleted 
when this command is deleted. When a policy is applied on an interface, the 
previous WRED configuration on interface level will become ineffective.

qos policy, traffic behavior, classifier behavior.

# Configure to adopt WRED and count discard rate with IP precedence.

<Sysname> system-view

[Sysname] traffic behavior database

[Sysname-behavior-database] queue wfq

[Sysname-behavior-database] wred 

wred dscp dscp-value low-limit low-limit high-limit high-limit [ discard-probability 
discard-prob ]

undo wred dscp dscp-value

Traffic behavior view

dscp-value: DSCP value, in the range 0 to 63, which can also be any of the 
keywords 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 wred dscp command to set DSCP lower-limit, upper-limit and drop 
probability denominator of WRED.

Use the undo wred dscp command to delete the configuration.