IfDescr vs IfIndex

[juan.esc...@gmail.com]

I’m trying to create a dashboard in grafana but I’m having a hard time when trying to use ifDescr. I can get it to pull the correct data when I create the query bit when I try to draw out the graph I get no data. I’m using snmp_exporter and there is data being collected and I can see it in a graph if I set it static.


I’ve tried both ifdescr and ifindex to show the data and neither work.

[Juan Escudero]

Here are some examples,

irate(ifHCInOctets{job='floor_switches',instance='$host',ifIndex='409'}[5m]) * 8  this works properly.  

irate(ifHCInOctets{job='floor_switches',instance='$host',ifDescr='$ifDescr'}[5m]) * 8 this does not work properly

Im not sure why when i try to use ifDescr it does not produce any data

[Ben Kochie]

Can you share the snmp.yml ifHCInOctets section?

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[Juan Escudero]

- name: ifHCInOctets
oid: 1.3.6.1.2.1.31.1.1.1.6
type: counter
help: The total number of octets received on the interface, including framing
characters - 1.3.6.1.2.1.31.1.1.1.6
indexes:
- labelname: ifIndex
type: gauge

[Ben Kochie]

This mapping doesn't contain any ifDescr mapping, so you can only lookup by ifIndex.

In order to lookup by ifDescr, you either need to use a group_left join[0], or added it to the snmp.yml as a lookup[1].

[0]: https://www.robustperception.io/exposing-the-software-version-to-prometheus/

[1]: https://github.com/SuperQ/tools/blob/master/snmp_exporter/if_mib.yml#L639-L662

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[Juan Escudero]

Thanks for the info. I got it to work using ifIndex but i will look into using lookups and group_left.