Test QoS settings

americaneldercare
americaneldercare used Ask the Experts™
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I am looking to introduce some QoS policies but want to test to make sure they are getting the proper priority over other traffic.  The layer 3 switch controlling the traffic is a Dell 6248p.

Aside from bringing my computers 1GB NIC to full capacity, how else can I confirm that packets going from my computer to a server over port XXXX is getting a higher priority?

Are there any good software utilities for testing such (free of course is preferred)?
 
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Commented:
Hello,

Please take a look at this thread @ https://supportforums.cisco.com/message/631674.  The following are likely to be some of the options you can consider:

iPerf (a traffic generator) @ http://sourceforge.net/projects/iperf/

QCheck from Ixia @ http://www.ixchariot.com/products/datasheets/qcheck.html

For the actual test, you may want to isolate each traffic type and test them individually. Once you are happy that each individual traffic type is working, you can then combine a priority traffic type like voice with another traffic type not important like Internet.  You need to try sending more than the bandwidth can cope with. The expectation is that your data / Internet traffic is sacrificed for your voice traffic which should meet its full committed rate before any loss.

Hope this helps.

Thanks.

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Commented:
Koudry,

Thanks for the reply.  I saw some of that information already, though will take another look into it.  Ultimately though, it sounds like you are indicating there is really no way to truly test the QoS aside from overloading the bandwidth which is ultimately where my issue lies.  The switch and many of the computers connected are using 1gig.  so it sounds like I will probably need to test with a 100mb device or manually restrict the bandwidth down.

Commented:
Hello,
To be sure that your priority class is being treated with priority, you will need to create a scenario of congestion to see if the non-priority queue is sacrified for the priority one, e.g. voice.
If you have 1G pipe, you may want to restrict the bandwidth as you indicated since it is going to be difficult to congest your 1G pipe unless you find a way to generate obove 1G traffic.
Thanks.

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