RRD tune for sensor graphs

Help
1

Does anyone know of any options to filter max/min values of health or wireless graphs? I have a radio that graphs -100000dbm Tx power when the link is lost. It makes reading the rest of the graph difficult when values are typically -50dbm.

Can this be done in config or would it need a polling module override for the device model to set min value to something like -100dbm?

2

Hey,

Probably needs updating but when I used to use Cacti, I did this. It’s a bit manual, but it worked.

3

Thank you! I did see the removespikes scripts and considered that would be an option to run on interval. Ideally, I want to catch this during polling and remove values out of expected range, because we have >100 of these radios and the spikes happen often.

4

More info: I confirmed that the radio itself is returning the unexpected value. Does anyone know if it’s possible to define a low limit value for the RRD/graph?

SNMP['/usr/bin/snmpget' '-M' '/opt/librenms/mibs:/opt/librenms/mibs/saf' '-m' 'SNMPv2-TC:SNMPv2-MIB:IF-MIB:IP-MIB:TCP-MIB:UDP-MIB:NET-SNMP-VACM-MIB' '-v2c' '-c' 'COMMUNITY' '-OQXUte' '-Pu' '-On' 'udp:HOSTNAME:161' '.1.3.6.1.4.1.7571.100.1.1.7.1.3.10.0' '.1.3.6.1.4.1.7571.100.1.1.7.1.3.11.0' '.1.3.6.1.4.1.7571.100.1.1.7.1.3.2.0' '.1.3.6.1.4.1.7571.100.1.1.7.1.2.1.0' '.1.3.6.1.4.1.7571.100.1.1.7.1.2.3.0' '.1.3.6.1.4.1.7571.100.1.1.7.1.2.2.0' '.1.3.6.1.4.1.7571.100.1.1.7.1.2.7.0' '.1.3.6.1.4.1.7571.100.1.1.7.1.3.14.0']  
.*.4.1.75*.*.0 = 0
.*.4.1.75*.*.0 = 74917
.*.4.1.75*.*.0 = -99999     <--- value out of range
.*.4.1.75*.*.0 = 18
.*.4.1.75*.*.0 = -99999
.*.4.1.75*.*.0 = 11245000
.*.4.1.75*.*.0 = 10755000
.*.4.1.75*.*.0 = 1137
5

I believe you can apply:

–lower-limit

–upper-limit

In the graphs you require from the web GUI, and additionally you can specify --rigid which stops values outside lower and upper, but don’t know if that works in LibreNMS.