3Com MSR 50, MSR 30 Qos wred dscp, By default, the dropping method of a queue is tail drop, 1849

1849

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

Related commands: qos wfq, display qos wred interface.

Examples # 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

Syntax qos wred dscp dscp-valuelow-limit low-limithigh-limit high-limitdiscard-probability discard-prob

undo qos wred dscp dscp-value

View Interface view

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

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

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

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

Description 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.

Related commands: qos wred enable, display qos wred interface.

Examples # 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