Solved: Unable to read temperature sensors on a C8200-1N-4T over SNMP

kasper123 · ‎04-04-2025

I have two new C8200-1N-4T routers. I'm trying to read the temperature sensors over SNMP but it doesn't seem to be working.

Currently running IOS XE 17.16.01a but it's the same with 17.09.02a.

On an older C8200-1N-4T (so exactly same model) running 17.09.02a i can read the temp sensor with this OID:

mib-2.99.1.1.1.4.7003

On the new C8200-1N-4T when I try with the same OID I get the error:

SNMPv2-SMI::mib-2.99.1.1.1.4.7003 = No Such Object available on this agent at this OID

How could this be? It's the same type of router running the same software version.

Ben Walters · ‎04-09-2025

Have you tried 1.3.6.1.4.1.9.9.91.1.1.1.1?

That should be the table with 1.3.6.1.4.1.9.9.91.1.1.1.1.4 being the sensor value for temps.

View solution in original post

marce1000 · ‎04-04-2025

- Sometimes the OID can slightly differ according to the hardware layout , try to find out with :
show snmp mib

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

kasper123 · ‎04-05-2025

Hi. Not sure what I should be looking for.

show snmp mib produces a huge list. Tried searching for anything temperature related but couldn't find anything.

marce1000 · ‎04-05-2025

- You could also try to snmpwalk the OID partially starting from 2.99.1.1.1.4
or use show snmp mib | inc 2.99

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

kasper123 · ‎04-06-2025

Thank you for taking the time to respond @marce1000

show snmp mib | inc 2.99 doesn't return anything.

marce1000 · ‎04-06-2025

- Not all devices have a temperature sensor ; check with show environment , if available you could also try :
1.3.6.1.4.1.9.9.13.1.3.1.3 (ciscoEnvMonTemperatureStatusValue) present in CISCO-ENVMON-MIB

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

kasper123 · ‎04-06-2025

The sensors are there for sure. Already checked that.

1.3.6.1.4.1.9.9.13.1.3.1.3 is also not there.

marce1000 · ‎04-07-2025

- Have an snmpbulkwalk of CISCO-ENVMON-MIB and look for related OID's

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Ben Walters · ‎04-09-2025

Have you tried 1.3.6.1.4.1.9.9.91.1.1.1.1?

That should be the table with 1.3.6.1.4.1.9.9.91.1.1.1.1.4 being the sensor value for temps.

kasper123 · ‎04-09-2025

Hi Ben. Yes that was it. Did an snmp walk and got the values.

So on the same type of device running the same software version,

this: enterprises.9.9.91.1.1.1.1.4.7003 works on both the new one and the old one, while

this: mib-2.99.1.1.1.4.7003 works only on the older device but doesn't work on the new one.

On the old device both enterprises.9.9.91.1.1.1.1.4.7003 and mib-2.99.1.1.1.4.7003 show the same value.

Thank you!