3com WX3000 User Manual

 

1-26 

The algorithm for queue scheduling to be used and the related parameters are determined. 

Follow these steps to configure SP queue scheduling algorithm: 

Enter system view 

system-view 

— 

Configure SP queue 
scheduling algorithm 

undo queue-scheduler [ queue-id ] 
&<1-8> 

Optional 

By default, SP queue scheduling 
algorithm is adopted on all the 
output queues of a port. 

 

Follow these steps to configure SDWRR queue scheduling algorithm: 

Enter system view 

system-view 

— 

Configure SDWRR 
queue scheduling 
algorithm 

queue-scheduler wrr { group1 
{ queue-id queue-weight } &<1-8> | 
group2 { queue-id queue-weight } 
&<1-8> }* 

Required 

By default, SP queue scheduling 
algorithm is adopted on all the 
output queues of a port. 

 

A port on a device can accommodate up to eight output queues. You can configure to use SP queue 

scheduling algorithm, SDWRR queue scheduling algorithm, or combine the two as required.  

z 

With SDWRR queue scheduling algorithm adopted, the output queues of a port can be assigned to 

group 1 and group 2. The two groups are scheduled using SP algorithm. For example, you can 

assign queue 0, queue 1, queue 2, and queue 3 to group 1, and assign queue 4, queue 5, queue 6, 

and queue 7 to group 2. The queues in group 2 are scheduled preferentially using WRR queue 

scheduling algorithm. Queues in group 1 are scheduled using WRR queue scheduling algorithm 

only when all the queues in group 2 are empty. 

z 

With both SP and SDWRR queue scheduling algorithms adopted, groups are scheduled using SP 

algorithm. Assume that queue 0 and queue 1 are scheduled using SP algorithm; queue 2, queue 3, 

and queue 4 are assigned to group 1; queue 5, queue 6, and queue 7 are assigned to group 2. The 

queues in group 2 are scheduled preferentially using WRR queue scheduling algorithm. When all 

the queues in group 2 are empty, queues in group 1 are scheduled using WRR queue scheduling 

algorithm. Then, queue 1 is scheduled, and then queue 0.  

 

When using SDWRR or SP+SDWRR combination for queue scheduling, you are recommended to 

assign queues with successive queue numbers to the same scheduling group.