Cacti, Devices, and total bandwidth

[eholz1]

Hello Members,

Added a question to this post - I want to see "total bandwidth" for several devices. I will use the aggregate graph feature.
What type of graph template should I used to see "totals" of the interfaces, In and Out, and even a sum of these values?

I have tried using In/Out Bits - Negative Out - but it seems I get no totals, only current, average and max values in the aggregate graph.
I am trying to use the In/Out Bits (Total Bandwidth) graph template - is this the correct approach??

How does cacti calculate totlal bandwidth for an interface (or interfaces)?
I am not quite understanding how it works.
I have seen the formula in the "Total Bandwidth" template: |sum:auto:current:2:auto|. This is being used for both in and out.
I have seen a posting on the cacti forum, where a user suggested using this version: |sum:auto:total:2:auto|

I have tried both of these in a template to graph a device with ONE interface, and get confusing information.
Does cacti total both in and out - which it calls total bandwidth?

If I use the equation with the "total" keyword I get the same value for in and out.
Any info or suggestions will help.
I am attempting to use an aggregate graph to "sum" the totals for multiple devices. I am testing using just 4 devices.

Any info will help,
thanks,
eholz1

[TheWitness]

I think in 1.2.22, you can create an aggregate template and include the bandwidth data.

[eholz1]

Hello The Witness,

Thanks for the info. The forum is always helpful.
What is the difference between these two graph templates?
"In/Out Bits - Negative Out" and "Interface - Traffic (bits/sec, Total Bandwidth)" in terms of the way the collect data, and graph the data?

I assumed that if I graph ONE interface on a device using the "In/Out Bits - Negative Out" the total traffic (for the time range selected)
would be the sum of the inbound plus the outbound: here is a graph

Notice I would call the total = 8.37 K. for about 5 min.

cacti_traffic-bits.JPG (73.59 KiB) Viewed 644 times

Now look at this graph - from "Interface - Traffic (bits/sec Total Bandwidth)


AS you can see the time is 5 minutes in both cases. I know the Total Bandwith template uses this Total Out: |sum:auto:current:2:auto|
to calculate the BW. What am I not understanding about traffic flow, and inbound and outbound, etc The total is in MB, much larger than the
"In/Out Bits - Negative Out"

Thanks,
eholz1

[TheWitness]

Do the math, the data looks right to me.

1650 / 8 * 86400 ~= 17.8MB.