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I have a Cisco 2960X (48) with a weird behavior.

I keep seeing alerts from my nagios telling me that the "site" is DOWN, then UP. It happens almost 10 times a day. It looks like the switch is rebooting, people are losing their IPs, all ports are turning off, then yellow, and green.

The config is clean and no ports are err-disabled. No stack, no routing, two SFPs with no problems.

I first thought it was the power supply or the inverter, but it's not. then i thought the switch rebooted itself for some reason, but no.

the result of : sh version

ROM: Bootstrap program is C2960X boot loader BOOTLDR: C2960X Boot Loader (C2960X-HBOOT-M) Version 15.2(4r)E3, RELEASE SOFTWARE (fc4)

SW-SLOUS uptime is 1 week, 4 hours, 35 minutes System returned to ROM by power-on System restarted at 10:30:28 UTC Wed Dec 9 2020 System image file is "flash:/c2960x-universalk9-mz.152-4.E8/c2960x-universalk9-mz.152-4.E8.bin" Last reload reason: power-on

I did a hard reboot on wednesday 9. But the uptime shows 1 week and 4 hours. So I guess the switch did not reboot, can someone please help me with that, I do not have cisco tac.

Thank you

benbelo
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1 Answers1

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System returned to ROM by power-on System restarted at 10:30:28 UTC Wed Dec 9 2020

It looks like the switch did reboot on Dec 9 (that was a week ago). You can try looking at the log.

show logging

If it's not enabled, try this:

config t
logging buffered information

The log should show you what happens during the event. I suspect the switch is not the problem.

Ron Trunk
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  • Yes, it's me, I did the reboot on wednesday 9. But it keeps rebooting every hour, every day. Seems like the logs are enabled, but it only shows the interfaces states. So I assume that the switch keeps "reloading" (no rebooting) but I can't see it in the logs... – benbelo Dec 16 '20 at 16:18
  • Do the logs show any event before the last "reload"? – Ron Trunk Dec 16 '20 at 16:47
  • No, nothing except ports going up and down... – benbelo Dec 17 '20 at 08:05
  • Try entering the command `logging buffered debug` to get more information in the logs. Do you have power injectors or anything like that? – Ron Trunk Dec 17 '20 at 12:56