I would like to monitor our bandwidth of our links.

We are using SNMP on our firewalls, and we are getting the ifInOctets and ifOutOctets OIDs.

How do I convert these into bandwidth? According to the Cisco website - http://www.cisco.com/c/en/us/support/docs/ip/simple-network-management-protocol-snmp/8141-calculate-bandwidth-snmp.html it statest the following:

Input utilisation = difference betwwen two poll cycles * 8 * 100 / number of seconds in the difference * the interface speed.

I can get the interface speed, the inOctets and outOctets, but how do I do a custom channel that does this calculation?

Thanks,

Tom

Article Comments

Dear cm2000

As first step, please check your SNMP Traffic Sensor settings. The sensor allows to create more channels for additional data, depending on the SNMP version in use.

If you want to use custom OIDs, please create an SNMP Custom sensor. As value type, please set Delta (Counter) to have PRTG automatically perform the "difference between two poll / time of the difference" calculation.

The SNMP Custom sensor also allows to scale the value by using the field "Multiplication" and "Division".


Mar, 2015 - Permalink