Sensor over limit

Help
1

Hi…I have cisco C3850 core switch installed and it gives me sensor over limit notifications…not sure where under health change the settings
Here is how it looks

Alert for device xxxx - Sensor over limit got worse
Severity: critical
Timestamp: 2018-03-01 12:36:03
Unique-ID: 869504
Rule: Sensor over limit
Faults:
#1: sensor_id => 10198; sensor_oid => .1.3.6.1.4.1.9.9.91.1.1.1.1.4.1082; sensor_descr => Gi1/0/12 - Gi1/0/1 Transmit Power ;
#2: sensor_id => 10203; sensor_oid => .1.3.6.1.4.1.9.9.91.1.1.1.1.4.1087; sensor_descr => Gi1/0/1 Receive Power Sensor - Gi1/0/2 Transmit Power ;
#3: sensor_id => 10208; sensor_oid => .1.3.6.1.4.1.9.9.91.1.1.1.1.4.1092; sensor_descr => Gi1/0/2 Receive Power Sensor - Gi1/0/3 Transmit Power ;
#4: sensor_id => 10209; sensor_oid => .1.3.6.1.4.1.9.9.91.1.1.1.1.4.1093; sensor_descr => Gi1/0/2 Receive Power Sensor - Gi1/0/3 Receive Power ;
#5: sensor_id => 10213; sensor_oid => .1.3.6.1.4.1.9.9.91.1.1.1.1.4.1097; sensor_descr => Gi1/0/3 Receive Power Sensor - Gi1/0/4 Transmit Power ;
Alert sent to:

2

Sensor high limits can be set in the device settings under health.
See here https://docs.librenms.org/#Support/Device-Sensors/

3

I understand because I have been searching long time for it…but somehow I cannot find answer to my issue…I have multiple switches like that and only this one gives those warning…not sure where to change it under health…what values should be changed since I dont see any similar on any other of my switches…I know it has something to do with power on those ports but where exactly I adjust those …I have no clue

4

You should be able to set the high and low values for that device under health settings.
Look for dbm. If the vaules are already set then you may have an issue that you need to look at for that device.
Just judging from your post looks like SFP transmit power/receiver power.

5

I figured it has something to do with the dbm -transmit and receive power—just dont know what those numbers should be, right now I have set to high -0.475 and low -0.525 for transmit, and receive high to -0.57 and low to -0.63…I have no idea where can i find how those values should be set…looked all over

6

That depends on the device manufacture specs/ what type SFP and fiber. Google High and low vaules for fiber sfp

7

Already did and they are not giving any specifics…sigh

8

Oh really??

okay well, you really should read up what best practices are for dBm readings with fiber.

Here are some links.

http://www.thefoa.org/tech/FAQS/FAQ-TEST.HTM
http://www.thefoa.org/tech/ref/testing/test/dB.html

9

You should to able to see the thresholds (high/low) with “show interface transceiver detail” command via CLI, if your fiber transceiver supports it.

1 Like
10

should I take into consideration the high warning or high alarm?

11

should I take into consideration the high warning or high alarm?

12

You should definitely set it to warning values from my experience, but it’s up to you.