How is bandwidth monitored in nagiosxi with MRTG and PNP

[lizhi1989]

I notice that both MRTG and PNP are used in nagios XI to generate performance data.
Can anyone explain to me how they work together?

[tmcdonald]

MRTG is used more for monitoring network devices via SNMP. PNP is the graphing engine. PNP takes the data that MRTG gathers (technically MRTG gathers the data and then another plugin parses it in a host/service check, but that's another story) and then builds up the perfata from there. To actually build the charts we use either PNP's built-in graphing or, in newer XI versions, HighCharts, which is a Javascript-based graphing engine.

If the check was not made using the Switch and Router Wizard in XI then it almost certainly is not using MRTG to gather metrics on the backend.