Accton Technology VS4512DC - Manual (Page 295)

Priority Commands
4-149
Command Usage
You can set the switch to service the queues based on a strict rule that
requires all traffic in a higher priority queue to be processed before lower
priority queues are serviced, or use Weighted Round-Robin (WRR) queuing
that specifies a relative weight of each queue. WRR uses a predefined relative
weight for each queue that determines the percentage of service time the
switch services each queue before moving on to the next queue. This
prevents the head-of-line blocking that can occur with strict priority queuing.
Example
The following example sets the queue mode to strict priority service mode:
queue bandwidth
This command assigns weighted round-robin (WRR) weights to the four class of
service (CoS) priority queues. Use the no form to restore the default weights.
Syntax
queue bandwidth weight1...weight4
no queue bandwidth
weight1...weight4 - The ratio of weights for queues 0 - 3 determines the
weights used by the WRR scheduler. (Range: 1 - 15)
Default Setting
Weights 1, 4, 16, 64 are assigned to queues 0 - 3 respectively.
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
WRR controls bandwidth sharing at the egress port by defining scheduling
weights.
Example
This example shows how to assign WRR weights to each of the priority queues:
Related Commands
show queue bandwidth (4-151)
Console(config)#queue mode strict
Console(config)#
Console(config)#queue bandwidth 1 3 5 7
Console(config)#