Quality of Service (QoS)

Queuing Methods

In software release 06.6.X and higher, you can configure the device to use one of the following queuing methods:

•Weighted – A weighted fair queuing algorithm is used to rotate service among the four queues. The rotation is based on the weights you assign to each queue. This is the default queuing method and uses a default set of queue weights. This method rotates service among the four queues, forwarding a specific number of packets in one queue before moving on to the next one.

The number of packets serviced during each visit to a queue depends on the percentages you configure for the queues. The software automatically converts the percentages you specify into weights for the queues.

•Strict – The software assigns the maximum weights to each queue, to cause the queuing mechanism to serve as many packets in one queue as possible before moving to a lower queue. This method biases the queuing mechanism to favor the higher queues over the lower queues. For example, strict queuing processes as many packets as possible in qosp3 before processing any packets in qosp2, then processes as many packets as possible in qosp2 before processing any packets in qosp1, and so on.

Selecting the Queuing Method

The HP 9304M, HP 9308M, and HP 6208M-SX routing switches and the HP 6208M-SX switch use the weighted fair queuing method of packet prioritization by default. To change the method to strict queuing or back to weighted fair queuing, use one of the following methods.

USING THE CLI

To change the queuing method from weighted fair queuing to strict queuing, enter the following commands:

HP9300(config)# qos mechanism strict

HP9300(config)# write memory

Syntax: [no] qos mechanism strict weighted

To change the method back to weighted fair queuing, enter the following commands:

HP9300(config)# qos mechanism weighted

HP9300(config)# write memory

USING THE WEB MANAGEMENT INTERFACE

1.Log on to the device using a valid user name and password for read-write access. The System configuration dialog is displayed.

2.Click on the Weighted or Strict radio button next to QoS.

3.Click the Apply button to save the change to the device’s running-config file.

4.Select the Save link at the bottom of the dialog, then select Yes when prompted to save the configuration change to the startup-config file on the device’s flash memory.

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