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How to test a switch

Posted on 2012-03-28
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Last Modified: 2012-04-04
Hi all,

I received a Juniper switch and I am asked to test it as the customer indicated that the switch is faulty. Are there any steps to follow when testing a layer 3 switch?
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Question by:Zak
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Our standard switch test involves a firmware wipe and re-application (or upgrade depending on intended use, age, and smartnet/support contract status). We also fill (and empty) the flash to make sure there are no errors on the rest of the internal storage.

All counters are captured via screenshot, and then error and packet counters are reset.

We then test setting one port on one vlan, setting all the rest on a second vlan, and then sequentially using each port to copy a 10GB file from the device on vlan 2 to the original device on vlan 1.

Devices then have the counters compared to baseline and to the original screenshot.

Once that's passed, we log that the device *was* suspect but tested OK, just in case someone wants to deploy it to a mission-critical role.
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by:Nayyar HH (CCIE RS)
Nayyar HH (CCIE RS) earned 250 total points
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Look into the switch documentation for how to manually execute Diagnostic testing, Power On Self Test (POST) on the switch - most managed switches support these functions
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