Moved to the appropriate forum.

Hi Jason

is there any chance you can post the pointers to the appropriate forum to assist in finding the answers please

many thanks

dave

The answer isn't actually posted anywhere as of right now.  I was simply moving this question to the appropriate forum as it was posted in one of the other forums.

I do have a task though to dug up the answer, I just haven't had the time yet.

So here is how Interface Utilization is captured and tracked...

With each poll of the monitor, we capture ifInOctets and ifOutOctets.  By definition of the if MIB, those values are defined as Counter32 type, which basically means that the value continues to increase until reaching the max and then starts over.  To calculate utilization, we use the following formula:

(CurrentValue - PreviousValue) / time

Hopefully this clears it up.  If not, let me know.

Thanks for the reply! So if I understand correctly, if you poll the device every 5 minutes, the reported bandwidth is the average of last 5 minutes. If you poll the device every 10 minutes, the reported bandwidth is the average of last 10 minutes, e.t.c... ?

That is correct @Harris.

Hi Jason,

If I may ask you to expand a little bit further on the interface utilization.

I noticed that when you click on an interface (within the device status) that has monitoring turned on, two graphs are displayed. One is the summary that polls at the pre-defined interval and the other is the Real Time Interface Utilization.

Does the Real time only poll once you have clicked through to this section of the interface utilization?

I noticed it polls around every 12s, but then all of this data is lost once the webpage refreshes. Are we able to customise this option to allow it to keep history of the real time data ?

There is a problem with the summary graph because we have issues where the plot point goes back in time. Is this a known issue or should we log it?

Cheers

Mike

The real-time graphs are only available when you visit pages that have them.  There is not a way to save this data, as it would quickly fill up a database, and they are really meant to be a trouble-shooting tool.  That being said, there are some real-time graphs that are available as dashboard reports.  You could use those to create a dashboard that had real-time graphs from different devices all on the same page.

As for the summary graph issue, I am not aware of anything that is known, but that doesn't mean it isn't.  The support folks would be the best resource for tracking down the issue.

Kind of a tangent question, I'm not sure if i understood correctly but when selecting GB MB, etc instead of a percentage is this measured in GiB or GB and is it per second average or a total size transferred within the "For" "Amount of minutes" selection?

The counter itself is measured in bytes, so choosing GB or MB converts the measurements to the appropriate units.  The values that are captured are done using the formula above, so you end up with the amount of utilization at the time of poll.

Good discussion, thank you for your time.