topic Re: OIDs for Utilization in ExtremeCloud IQ

OIDs for Utilization

tandrews1 — Wed, 03 Feb 2021 01:35:06 GMT

I would really like to graph utilization for our AP230s and 250s. I’m looking at the AH-INTERFACE-MIB and the only options I see are ahRadioTxAirtime and ahRadioRxAirtime, which are counters that pull airtime in microseconds.

When in the CLI you can run show int wifi0 or show int wifi1 and get utilization data like:

Rx airtime=634.69 s; Tx airtime=7564.03 s; CRC error airtime=764.45 s; Rx airtime percent=0.00%; Tx airtime percent=0.00%; CRC error airtime percent=5%; Tx utilization=3%; Rx utilization=5%; Interference utilization=10%; Total utilization=18%;

All nice metrics that would be useful in graph form. I’m curious how they are calculated and if those metrics are available via snmp?

Re: OIDs for Utilization

reinhardg — Thu, 04 Feb 2021 20:22:18 GMT

Call snmpwalk and have a look to the result. You mac start at the OID given below:

snmpwalk -M path_to_MIB-files -v 2c -c your_community IP_of_AP .1.3.6.1.4.1.26928.1.1.1.2.1.3.1

Re: OIDs for Utilization

tandrews1 — Thu, 04 Feb 2021 22:38:37 GMT

I’ve done that. /opt/librenms/aerohive contains the AH-TRAP-MIB, AH-INTERFACE-MIB, AH-SMI-MIB and AH-SYSTEM-MIB

snmpwalk -M /opt/librenms/aerohive -v 2c -c community 10.19.102.5 .1.3.6.1.4.1.26928.1.1.1.2.1.3.1

I get a list like:

iso.3.6.1.4.1.26928.1.1.1.2.1.3.1.22.7 = Counter32: 326896141
iso.3.6.1.4.1.26928.1.1.1.2.1.3.1.22.8 = Counter32: 922876642
iso.3.6.1.4.1.26928.1.1.1.2.1.3.1.23.7 = Counter32: 3852580482
iso.3.6.1.4.1.26928.1.1.1.2.1.3.1.23.8 = Counter32: 2098351997

Not sure why I don’t see the pretty names… regardless… as I look through the mibs there is nothing defined for Tx Utilization, Rx Utilization, Interference Utilization or Total Utilization.

The only relevant counters I see are the 4 above, which are ahRadioTxAirtime and ahRadioRxAirtime for wifi0 and wifi1 respectively. These are cumulative measures in microseconds. Possibly usable, but would require a bit of coding to get deltas, and divide by the polling period.

Re: OIDs for Utilization

tandrews1 — Sat, 06 Feb 2021 04:11:02 GMT

Here is another wrinkle… the AH-INTERFACE-MIB shows:

ahRadioTxAirtime OBJECT-TYPE
SYNTAX   Counter64
   MAX-ACCESS read-only
   STATUS   current
   DESCRIPTION "The accumulative transmit time in microseconds (us)
           from the given Radio."
   ::= { ahRadioStatsEntry 22 }

But if you run snmpwalk you see what I pasted above… all Counter 32.

Re: OIDs for Utilization

reinhardg — Tue, 09 Feb 2021 18:04:49 GMT

Please check whether the path to your MIB-files is correct and whether your MIB-files are in the proper format. On Linux I had to replace “Carriage return (+ Linefeed)” with Linefeed.

Re: OIDs for Utilization

reinhardg — Wed, 17 Feb 2021 16:48:52 GMT

In our case (HiveManager Classic on-prem) we had also to delete some characters in some Object Identifiers: The file “ah_smi_mib.txt” contains 4 identifiers that contain an underline-character: ahAPHiveAP*. We had to remove these underline-characters.