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Failing Switch??

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4 replies

by mac

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We have a site which experienced a rare failure. An "18-wheeler" lost control and plowed down 3 or 4 power/utility poles. This wiped out power and internet to our clinic and it was discovered that the on-site power backup solution was not working. We have most of the clinic back up with the exception of one segment (and, finally to the point of this question.)

We rebooted everything but had no connectivity (to anything), checked a few things on the local firewall and restarted it, this gave us "some" connectivity. We then moved all cabling from the primary switch onto the remaining two (these are Enterprise class D-Link switches, one managed and two smart). By the end of the day we had the segment working well.

The next morning another call, no connectivity on this node! We discovered quickly that those systems connected to the last switch were still functional so this made for a quick fix and we moved the critical connections onto the last switch. Case closed.

Next day, yet another trouble ticket. This time the clients closest to the remaining switch, less than ~20 feet, were still functioning, those ~45 feet or less away were getting sporadic connectivity, and those ~50 feet or greater were getting no connectivity.

I have never seen anything like this, anybody have any suggestions?

JRM

4 replies

by fregeus

Have you checked the logs of the switch? What do they say if anything? What do the affected port statistics show if anything? If you cannot find anything, then I would bring a new switch and transfer all the affected ports to it. If the problem persists, the switches are not the cause. then it could be a power issue. Did you replace the UPS?

TCB

by mac

Thanks for the response, it is appreciated. The switch logs show nothing, port statistics are within parameters. I have ordered a new Cisco 48-port switch, D-Link units are what we are having problems with. I did get a strange set of messages today: First, yet another trouble ticket, "no connectivity." Then, a few hours later, a message saying to forget the pervious trouble ticket as "everything [was] working now."

JRM

by fregeus

Your replacement unit should do the trick.

Good luck

TCB

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