Zabbix Link utilization in %

[Fotis]

Hello all,
I'm already familiar with net.if.in and net.if.out items, and now i would like to monitor the linkspeed which will help me to check the link utilization in %.
Anyone has any idea on how to implement this?

Thanks and regards,
Fotis

[Colttt]

i think you must use a calculated item.

you speed/total speed*100

[Fotis]

And how will you give a value to the total speed? Sometimes it might be 1000Mb/s, or 100Mb/s or 10Mb/s...

[timbo]

Hi Fotis,

Sorry for the late response. Colttt has suggested the right method - if you want to hard code the "total speed" in each calculated item, for each host you want to monitor. But I presume you would like to set this up in a template - so the bandwidth could change depending on the system/device the template is applied to?

If that is the case, you need to look into Macros:

https://www.zabbix.com/documentation/2.4/manual/config/macros/usermacros

Take note of the precedence.

So, you'd create the template with the calculated item Colttt suggested but with a macro (e.g. {$BANDWIDTH}) in place of the "total speed". You'd add the "{$BANDWIDTH}" macro to the template (typically with the most likely bandwidth in use - e.g. 1000), then on the host level you would add macros as the exceptions (e.g. 100, 10).

Template Macro:
{$BANDWIDTH}=1000

1st Host Macro
*NOT SET* (means it will inherit the template macro value of 1000)

2nd Host Macro:
{$BANDWIDTH}=100

3rd Host Macro:
{$BANDWIDTH}=10

(note: I've used Mbps in the above examples - it's better if you use bps)

I use this method on various WAN links, each with different bandwidth capabilities.

You can then set triggers when the Bandwidth utilisation exceeds 90% - for example.

Hope this helps.

-Timbo