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goinggreatFlag for United States of America

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Switch Failure single location

We have had 3com and now dlink switches fail at a single building at a disturbing ratio. We have not determined the exact cause of failure but the symptom is just all the lights flashing on a single switch in a daisy chain stack of three.  we lost two-three 3com switches and now we have lost two dlink poe switches in last 4 months.  It was different switches in the stack..we reset etc plug them in elsewhere and same result...any expert advice in trouble shooting...
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jp10558

Any surge protection? Dirty power maybe?
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We do have power protection/conditioning in place..
Airconditioning? Could they be overheating? Any chance of some sort of short into the ethernet cabling? I'm guessing you're not having any PCs with problems ...
we have air..no pc problems  issue jumped switches or we might be able to target a device plugged in..
Are these switches connected to another building?  A difference in ground potential will cause current to rush to the better ground.

Also, are these a true stack (i.e. managed and connected with stacking cables)?  If so, contact the manufacturer Tier2 support.  Some firmware cannot be upgraded safely in stack mode.

With Netgear, for instance, we went through several $3,000 bricks before Level 2 tech support told us:
1. upgrade all firmware before stacking
2. do not jump versions; install each upgrade incrementally...counter to the admin manual
3. do not stack units with different firmware versions; the master controller will try to upgrade the stack members...resulting in bricks

At one point in time I had two 48-port gigabit switches and two PoE switches sitting under my desk.  That was about $10-12,000 in bricks.
not a true brick just daisy chained with cat5..we did discover the importance of the same firmware version


All on the same firmware

they are connected to another building through a cisco router and then fiber optic cable.
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aleghart
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