Hello,

I've recently setup a monitoring system that, among other things, alerts me when the uptime of any switch on our network is less than an hour. I've done this as a way to alert when a switch unexpectedly reboots. I got an alert from a bunch of my routers today that the uptime counter was reset. Thinking that I had a large-scale electrical problem, I checked out the switches and was surprised to find that all my switches were up and running without a reboot in the logs. Upon logging into them and issueing "show system", they had a 49 day uptime proving that they had not been rebooted.

The OID that I am using to monitor our 5324, 5424 , 5524, and 6224 switches is "1.3.6.1.2.1.1.3.0". The counter currently reads only a few hours when queried even though the system uptime is still 49 days. My theory is that this counter is for a specific interface's uptime or something else but definately not the entire system's uptime.

Is there an available OID or other way to monitor the system's uptime accurately via SNMP? Thanks!

-Dennis