
Hi,
we are using 0.16.5.7901 (Stable) and have got some wrong alert of rebooting devices after 1 year, 132 days, 2h, 23m Actually they didn't reboot but uptime graphs restarted. Can be a kind of counter overflow ?
Affected devices are some brocade san switches and juniper isg1000
Regards, imedve

Hi,
forget it, 2^32 timeticks are about 497.1 days. SNMP counter overflow.
Regards, imedve
On h, 2016-06-20 at 09:31 +0000, Medve István wrote: Hi,
we are using 0.16.5.7901 (Stable) and have got some wrong alert of rebooting devices after 1 year, 132 days, 2h, 23m Actually they didn't reboot but uptime graphs restarted. Can be a kind of counter overflow ?
Affected devices are some brocade san switches and juniper isg1000
Regards, imedve
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Actually they didn't reboot but uptime graphs restarted. Can be a kind of counter overflow ?
Uptime is presented from the returned value in sysUptime.
observium~$ snmpwalk -v2c -c public device sysUptime DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (106822559) 12 days, 8:43:45.59
That would be the first place I would look. It may just be that the SNMP daemon on the device has restarted (which is what that value is actually reporting the uptime of).
Cheers,
Michael

Hi,
Yeah, this is likely to be caused by an SNMP counter overflowing. It's difficult to work around... :)
Adam.
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On 20 Jun 2016, 10:32, at 10:32, "Medve István" medve.istvan@pillerkft.hu wrote:
Hi,
we are using 0.16.5.7901 (Stable) and have got some wrong alert of rebooting devices after 1 year, 132 days, 2h, 23m Actually they didn't reboot but uptime graphs restarted. Can be a kind of counter overflow ?
Affected devices are some brocade san switches and juniper isg1000
Regards, imedve
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participants (3)
-
Adam Armstrong
-
Medve István
-
Michael