Question about percentage use of bandwidth

[archon]

Hi,
Situation: 1 interface and 4 vlans on it,
Problem: how to graph percentage use of bandwidth per vlan?

What i mean, let's say i have 10Mbit of traffic, Vlan1-1Mbit, Vlan2-2Mbit, Vlan3-5Mbit and Vlan4-2Mbit (10%, 20%, 50% and 20%). Now i would like to create a graph with constance height and a rows divided in proportion mentioned above (for ex. 100pix height of graph and 10px is green (V1), next up on it 20pix is blue (V2) and so on).
I don't know if it's understandable but i gave my best
Regards

[Howie]

Hi,
Situation: 1 interface and 4 vlans on it,
Problem: how to graph percentage use of bandwidth per vlan?

What i mean, let's say i have 10Mbit of traffic, Vlan1-1Mbit, Vlan2-2Mbit, Vlan3-5Mbit and Vlan4-2Mbit (10%, 20%, 50% and 20%). Now i would like to create a graph with constance height and a rows divided in proportion mentioned above (for ex. 100pix height of graph and 10px is green (V1), next up on it 20pix is blue (V2) and so on).
I don't know if it's understandable but i gave my best
Regards

The type of graph you want is called a stack in rrdtool terms. That part is pretty easy, but you need to get the data first!

You need your switch to give you per-vlan traffic stats though, and not all switches do - for example, a lot of Cisco and Extreme device won't.

[archon]

The type of graph you want is called a stack in rrdtool terms. That part is pretty easy, but you need to get the data first!

You need your switch to give you per-vlan traffic stats though, and not all switches do - for example, a lot of Cisco and Extreme device won't.

The data isn't a problem i have everything what i need
The vlans was only an example of what i would like to do.

[archon]

I've found something similar to what i want to achieve:
http://forums.cacti.net/files/pb_cacti.jpg
but i want to graph bandwidth not cpu usage, any suggestion? (i do have all needed data sources ready)

[gandalf]

You may find the AGGREGATE plugin useful
Reinhard