>> I've never heard of a switch reloading without a crash or reason.
The same for me, from this point my problem to understand the source of the issue.
>> Can you configure set test diag complete on the switch for me
It's already configured...
cat6513 (enable) sh test diaglevel
Diagnostic mode at last bootup : complete
Diagnostic mode at next reset : complete
>> Does the switch have redundant supervisors?
No, we have only one supervisor (MSFC2)
>> Is the switch powered through a UPS or some sort, or from mains?
Yes, the switch is powered through an UPS; we have verified that power supply is good, from the same source are powered all server in data center, and only machine that suffer this problem is catalyst 6513...
>> Also what does the show logg buff 1024 say?
From buffered log we can see only last 2 hours events, reboot is happened 2 days ago (during weekend).
Switch log to a syslog server, from it we can view nothing meaningful, in any case:
Dec 2 03:48:06 10.10.10.21 2006 Dec 02 03:53:08 MET +01:00 %SYS-5-AUTOSAVE:Autosaving system configuration to NVRAM
Dec 2 03:48:32 10.10.10.20 2006 Dec 02 03:53:34 MET +01:00 %SYS-5-AUTOSAVE:Autosaving system configuration to NVRAM
Dec 2 03:56:16 10.10.10.20 2006 Dec 02 04:01:19 MET +01:00 %CDP-4-DUPLEXMISMATCH:Full/half duplex mismatch detected on port
Dec 2 04:04:03 10.10.10.20 2006 Dec 02 04:09:06 MET +01:00 %SYS-5-AUTOSAVE:Autosaving system configuration to NVRAM
Dec 2 04:08:39 10.10.10.20 2006 Dec 02 04:13:38 MET +01:00 %ETHC-5-PORTTOSTP:Port 11/1 joined bridge port 11/1
Dec 2 04:08:39 10.10.10.20 2006 Dec 02 04:13:38 MET +01:00 %ETHC-5-PORTTOSTP:Port 11/3 joined bridge port 11/3
Dec 2 04:08:39 10.10.10.20 2006 Dec 02 04:13:38 MET +01:00 %ETHC-5-PORTTOSTP:Port 11/4 joined bridge port 11/4
Dec 2 04:08:39 10.10.10.20 2006 Dec 02 04:13:38 MET +01:00 %ETHC-5-PORTTOSTP:Port 12/17 joined bridge port 12/17
Dec 2 04:08:39 10.10.10.20 2006 Dec 02 04:13:38 MET +01:00 %ETHC-5-PORTTOSTP:Port 12/18 joined bridge port 12/18
Power is one of the reasons for reboots not the only reason. You should be looking into other areas. Slim down the chasis, use minimum number of modules required to meet your business objectives and observ. Which NMS do you use ? What events are being generated before the reboot. Are they consistent ?
I understand fixing random reboot is one of the dauting tasks. Is your IOS upto date ? which version are you using ? Is firmware on all modules upto date ?
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