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Aruba Switches Suddenly Dropped SFP Fiber Link

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  • 1.  Aruba Switches Suddenly Dropped SFP Fiber Link

    Posted 5 days ago

    Good evening

    Looking to see if anyone has any suggestions.  We have (2) aruba 2530 switches connected via SFP HPE 1000 LX Modules.  We share the space with a major manufacturer on their campus.  They have provided the fiber run for us with some intermediary junctions between.

    Last Friday suddenly the site went down due to power / internet outage assumption since it was in the middle of a hurricane.  However, that was not the case.  We noticed the link light out for the modules on both switches on either end of campus.  We tested with spare switches and spare modules but still no link light.  We would get a good link status between each spare and the main switch but the interconnect seemed to be the issue.

    This was tested via 3rd party today and light was good across the glass from end-to-end.  Yet of course, the status of the modules was still down.  The CLI doesn't show errors or other issues with the transceiver other than just down.

    What are we missing?  Should be outright swap both modules on the switches?  We effectively did this as part of our testing at each end. I realize that this was testing 1 foot of fiber vs 500 ft of fiber.  There is no explanation as there was no power outage, no physical damage to the fiber run itself, just suddenly dark.

    Anything else we can do in the CLI to see if the transceivers are presenting any errors or anything else to check?

    Any help would be appreciated.

    Thank you, 



  • 2.  RE: Aruba Switches Suddenly Dropped SFP Fiber Link

    Posted 5 days ago

    First thing is to check the logs on both ends for when the link first dropped and when you swap a transceiver: show log

    Next thing is to check the inserted transceivers - are they accepted and what do their diagnostics show? show interface all transceiver detail

    And just to make sure: 1000BASE-LX transceivers (J4859C?) require single-mode fiber. A run of just 500 ft might be using multi-mode fiber which won't work reliably. You'd require 1000BASE-SX transceivers for MMF, like J4848C.