Hi Pässler Team.

If i do a "debug snmp" on our cisco switches i see that the IP address of our PRTG do a complete snmp scan on all variables. That scan repeats every 70 minutes, and it takes about 6-10 minutes.

I disabled everyting I've found in PRTG.

- Set Sensor Management, Manual (no auto-discovery) - Set Scanning Interval to 12 hours

But still getting complete snmp scans all 70 minutes. Can you please tell me where i can disable these complete snmp scans? Sure i need a scan of power supply, temp, network traffic, etc. but i don't need all the time a complete scan.

Kind regards patrick

Article Comments

Hi Patrick,

Just to check, what is the current state for the Similar Sensor Detection and Recommended Sensors Detection? You can find the options under "Setup | System Administration | Monitoring". Please check whether disabling the options help disabling the scans.

Best regards,
Sebastian


Nov, 2020 - Permalink

Hi Sebastian.

Unfortunately, the sacan all still there after I set "Similar Sensor Detection and Recommended Sensors Detection" to Turn Off. Have you another idea why these scans occurs?

Kind regards Patrick


Dec, 2020 - Permalink

Hi Patrick,

Just to check, are you able to limit the scans by temporarily pausing all relevant sensors in PRTG?

Also please define how monitoring your "power supply, temp, network traffic, etc." differ from a full scan as it appears pretty comprehensive already imho.

Best,
Sebastian


Dec, 2020 - Permalink

Hi Sebastian.

I now paused the whole switch in PRTG, and still I see SNMP Packet received from PRTG. How can that be possible, as I know if I pause a device PRTG doesn't send traffic to that device, right?

It looks for me like a full scan, because if I monitor the debug snmp packets, i see all 5 seconds a snmp packet. But during al "Full"scan, i see a bunch more packets. And the Processor of the switch goes up to 100 % for about 15 minutes.

Sorry for all that late response but I'm only once per month at the customer site.

Thanks and kind regards Patrick


Jan, 2021 - Permalink

Hi Patrick,

I don't want to pass the buck to something we didn't consider yet, but if you pause the sensors in PRTG and still see traffic from the IP address of the PRTG Probe, is there anything else that might scan the device?

If not, I'd suggest to raise a normal support ticket with us via email to support@paessler.com so we can have a closer look at what's going on. Also debug files are much easier provided via email than on our knowledge base.

Best,
Sebastian


Jan, 2021 - Permalink

Hi Sebastian.

You're right. I didn't know that HP Network Node Manager was installed on the same machine as PRTG runs. I've checked the settings of HP Network Node Manager and saw that it do an inventory all 60 minutes. I've disabled it and now I don't see excessive snmp scans. Thanks for your help, very appreciated.

Kind regards Patrick


Feb, 2021 - Permalink

Hi Patrick,

This is great news and awesome find. Glad to see that you was able to track down the source of the issue.

Best,
Sebastian


Feb, 2021 - Permalink