3com S7906E Guide De Référence

 

4-4 

By default, no WRED table is created.  

A WRED table in use cannot be removed.  

Related commands: queue.  

# Create a WRED table named queue-table1. 

<Sysname> system-view 

[Sysname] qos wred queue table queue-table1 

[Sysname-wred-table-queue-table1] 

queue queue-id [ drop-level drop-level ] low-limit low-limit [ discard-probability discard-prob ] 

undo queue { queue-id | all } 

WRED table view 

2: System Level 

queue-id: ID of the queue, in the range of 0 to 7.  

drop-level drop-level: Specifies a drop level, in the range of 0 to 2. If this argument is not specified, the 

subsequent configuration takes effect on the packets in the queue regardless of the drop level.  

low-limit low-limit: Specifies a lower threshold. When the queue length exceeds the lower threshold, 

WRED begins to drop packets. The low-limit argument ranges from 0 to 100 and defaults to 10.  

discard-probability discard-prob: Specifies the discard-prob argument, which ranges from 0 to 90 and 

defaults to 10. Each drop level is configured with an independent drop probability. The meaning of 

discard-probability discard-prob depends on the type of the LPU where the WRED table-applied port 

resides, as shown in 

.  

Table 4-2 Description on discard-probability discard-prob 

Description on discard-probability discard-prob 

EA 

In a coordinate graph with the queue length percentage as the abscissa and drop 
probability as the ordinate, discard-prob specifies the degree of the included 
angle between the abscissa and the straight line starting at (low-limit, 0) and 
ending at (100%, max-drop-probability). The degree of the included angel 
ranges from 0 to 90.  

z 

When the queue length is fixed, the bigger the argument, the bigger the 
drop-probability.  

z 

When the argument is fixed, the bigger the queue length, the bigger the 
drop-probability.