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What is the recommend time for monitor Trunks?

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Hello eyerbody,

what is the recommend time for mointoring trunks? I think 1 minute is to high. Is there any influence on our network when I change the value to 5 seconds?

With best wishes.

Dirk

prtg snmp snmptrafficsensor traffic trunk

Created on Dec 9, 2015 2:18:29 PM

Last change on Dec 9, 2015 2:42:54 PM by Luciano Lingnau [Paessler]



4 Replies

Accepted Answer

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Hello Dirk,
we appreciate your inquiry.

By Trunks are you referring to switch port aggregation (LAG's?) Are you monitoring those with the standard SNMP Traffic Sensor?

Please be aware that SNMP Bandwidth is measured with an delta calculation, the monitored devices reports the traffic as volume and PRTG will make two measurements and calculate the difference over time to provide the speed during that interval. Thus, you shouldn't loose much precision with longer scanning intervals.

PRTG has the lowest interval of 30 seconds built-in by default, which is a really short interval. We'll support/troubleshoot PRTG on intervals as low as 10 seconds but we don't recommend it, below that you'll be exceeding our "safe" recommendation and the configuration will be considered unsupported.

Using such low intervals won't play a role when using only a few sensors, but it can become a problem once PRTG has hundreds or thousands of sensors to be scanned every 5 seconds, that can lead to instability and other issues, we don't recommend it. As for the network traffic generated by PRTG operating with such low scanning intervals, it shouldn't play a big role on well-configured networks as SNMP is really a lightweight protocol.

Best regards,

Created on Dec 10, 2015 7:55:11 AM by Luciano Lingnau [Paessler]



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Hello Luciano,

thanks for your answer. No, we dont use Cisco trunks, we use using HP Procurve switches and are the trunks. Yes, i am using the SNMP traffic sensor.

Thank you in advance

Dirk

Created on Dec 10, 2015 8:18:39 AM



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Hello Dirk, thank you for your reply.

The guidelines above are vendor-independent, so please consider them as true for any device/scenario involving SNMP Sensors.

Created on Dec 10, 2015 9:13:11 AM by Luciano Lingnau [Paessler]



Votes:

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Ok,

thank you vey much for your support. You can close the question.

With best regards.

Dirk

Created on Dec 10, 2015 9:36:40 AM




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