Korenix JetNet 5228G Series, User Manual

Page: 587 / 658

Class of Service Commands
4-277
4
queue mode
This command sets the queue mode to strict priority, Weighted Round-Robin
(WRR), or or a combination of both for the class of service (CoS) priority queues.
Use the
no form to restore the default value.
Syntax
queue mode { strict | wrr | hybrid }
no queue mode
• strict - Services the egress queues in sequential order, transmitting all
traffic in the higher priority queues before servicing lower priority queues.
• wrr - Weighted Round-Robin shares bandwidth at the egress ports by using
scheduling weights 1, 2, 4, 8 for queues 0 - 3 respectively.
• hybrid - Services the highest priority queue (3) according to strict priority
queuing, after which the 3 lower priority queues (0, 1, 2) are processed
according to their WRR weightings.
Default Setting
Weighted Round Robin
Command Mode
Global Configuration
Command Usage
• The switch can be set to service the port queues based on strict priority, WRR,
or a combination of strict and weighted queueing.
• Strict priority requires all traffic in a higher priority queue to be processed
before lower priority queues are serviced.
• WRR uses a relative weight for each queue which determines the number of
packets the switch transmits every time it services a queue before moving on
to the next queue. Thus, a queue weighted 8 will be allowed to transmit up to
8 packets, after which the next lower priority queue will be serviced according
to it’s weighting. This prevents the head-of-line blocking that can occur with
strict priority queuing.
• When using hybrid priority queuing mode, the switch employ strict priority
queuing for the highest priority queue (queue 3) before processing queues 2
through 0 according to their WRR weights.
Example
The following example sets the queue mode to strict priority service mode:
Console(config)#queue mode strict
Console(config)#