Incorrect throughput graph

I was looking at some of the throughput graphs in cnMaestro today and noticed one ePMP GPS AP that showed almost 200mbps downlink bandwidth graphed. This radio is only connected at 100mbps and when I compare the data from the port stats (which I completely trust), I'm not sure how cnMaestro is generating these graphs.

vs.

Note... while it's truncated, this graph is for Oct 1st to current. Both graphs are for approx. the same time period.

We will follow up on this.  What version of ePMP software was running on the AP and SM at the time ?

The AP and SM were running 2.5, and then on Saturday the 3rd around 4pm we updated everything to 2.5.1.

Hmm, I went through all of my graphs and they seem pretty accurate, PTP and PTMP.

I wonder if its reading the AP different, could you possibly have a lot of chatter on the wifi interface?

I would think your monitor is reading the network interface, could cnMaestro be reading the wireless interface and be reading a lot of extra traffic?

I wonder if there is a way to break out the interfaces and see the traffic on both, LAN and WLAN

Just a thought...


@Ryo Haines wrote:

Hmm, I went through all of my graphs and they seem pretty accurate, PTP and PTMP.

I wonder if its reading the AP different, could you possibly have a lot of chatter on the wifi interface?

I would think your monitor is reading the network interface, could cnMaestro be reading the wireless interface and be reading a lot of extra traffic?

I wonder if there is a way to break out the interfaces and see the traffic on both, LAN and WLAN

Just a thought...


Hi Ryo, 

That is correct. Eric is monitoring the network interface while cnMaestro is reading the wireless interface. Hence the mismatch. That said, Eric provided us some really good feedback which we are going to use to tweak the sampling period to improve on it. 

Thanks,

Sriram