1 Reply Latest reply on Oct 17, 2012 10:51 AM by mharvey

    how does Orion calculate interface utilization?


      In the following report, which field is being used to calculate the transmit and receive utilization? Is the traffic expressed as a percentage of the Speed or the Bandwidth?

      Also, what is the difference between speed and bandwidth? Can the bandwidth differ from the speed for an interface?

      Thanks for any help.

        • Re: how does Orion calculate interface utilization?

          The fields being used are the bandwidth and traffic fields.  The receive traffic is divided by the bandwidth to get the percent utilization.  If the number is a decimal, then of it's .4 or below, it rounds down.  The receive and transmit bandwidth are pulled from the speed value that the device reports to NPM.  Yes, it is possible to have a different bandwidth than speed.  If you have a 100Mb pipe, but you're only allocated 1.54Mbps, then you would edit the interface and set the receive and transmit to 1.54Mb.  This would then allow the calculation to be done against what has been allocated from the port for your traffic.  This is usually the case when the interface is provided by someone else.  SNMP may discover the true speed of the pipe as 100Mbps which then shows as speed.  But if you are only allocated a T1 on that pipe, then you'd want to set that custom bandwidth to change the receive and transmit values to the amount you are allocated, and show bandwidth utilization based on that.



          Matthew Harvey

          Loop1 Systems