FortiSwitch - SNMP bug?

[rudybroersma]

The problem

I noticed from my PR #15735 that I had some weird non-working sensors on 200E-series switches:

Did some digging, turns out for this model (sw fw 7.4.0) the switch seems to be skipping a few indexes in the ENTITY-SENSOR-MIB. I'd appreciate if someone can confirm this is wrong behavior from the switch:

$ snmpwalk -v3 -u X -M /opt/librenms/mibs:/opt/librenms/mibs/fortinet -m all entPhySensorValue
ENTITY-SENSOR-MIB::entPhySensorValue.4 = INTEGER: 45
ENTITY-SENSOR-MIB::entPhySensorValue.5 = INTEGER: 39
ENTITY-SENSOR-MIB::entPhySensorValue.6 = INTEGER: 43
ENTITY-SENSOR-MIB::entPhySensorValue.7 = INTEGER: 38
ENTITY-SENSOR-MIB::entPhySensorValue.8 = INTEGER: 43
ENTITY-SENSOR-MIB::entPhySensorValue.9 = INTEGER: 39
ENTITY-SENSOR-MIB::entPhySensorValue.10 = INTEGER: 1
ENTITY-SENSOR-MIB::entPhySensorValue.11 = INTEGER: 1
ENTITY-SENSOR-MIB::entPhySensorValue.12 = INTEGER: 58
ENTITY-SENSOR-MIB::entPhySensorValue.13 = INTEGER: 58
ENTITY-SENSOR-MIB::entPhySensorValue.14 = INTEGER: 40
$ snmpwalk -v3 -u X -M /opt/librenms/mibs:/opt/librenms/mibs/fortinet -m all entPhysicalName
ENTITY-MIB::entPhysicalName.1 = STRING: FSW_248E-F
ENTITY-MIB::entPhysicalName.2 = STRING: mgmt
ENTITY-MIB::entPhysicalName.3 = STRING: internal
ENTITY-MIB::entPhysicalName.4 = STRING: Sensor1
ENTITY-MIB::entPhysicalName.5 = STRING: Sensor2
ENTITY-MIB::entPhysicalName.6 = STRING: Internal
ENTITY-MIB::entPhysicalName.7 = STRING: External
ENTITY-MIB::entPhysicalName.8 = STRING: Fan1
ENTITY-MIB::entPhysicalName.9 = STRING: Fan2
ENTITY-MIB::entPhysicalName.10 = STRING: Fan3

The ENTITY-SENSOR-MIB starts with index 4 and stops at 14. While ENTITY-MIB starts with 1 (as expected) and ends with 10. So the ENTITY-SENSOR-MIB indexes do not correspond to the ENTITY-MIB indexes.

This is not supposed to happen, correct? If so I'll submit a bug report at FortiNet

Currently this causes the power supply at ENTITY-SENSOR-MIB index 10 to be named as 'Fan3'.

I can confirm this is not an issue on 400-series switches.

Output of ./validate.php

x

What was the last working version of LibreNMS?

No response

Device info

FortiSwitch 242E

Discovery output

Device issue

Poller output

Device issue

[PipoCanaja]

Looks like a bug on this FortiSwitch 200E precisely, yes. Please open a case at the vendor.

[rudybroersma]

Thanks. Created a ticket at FortiNet. Will follow up!
So far issue seems to be limited to 200E-series FPOE (Full POE).
The 200E-series with half poe (only half the ports support PoE) don't seem to exhibit this issue

[rudybroersma]

Having a hard time convincing FortiNet that this is a their-problem and not a me-problem.
Ticket is still open though

[rudybroersma]

Issue has been escalated to Fortinet Engineering

My initial conclusion that it's limited to the 200-FPOE was wrong. All their switches have the same issue, but it's more prominent on the 200-FPOE's.

148F for example has the same problem. Index with ID 4 is missing from entPhysicalTable

ENTITY-MIB::entPhysicalName.1 = STRING: FSW_124F-P
ENTITY-MIB::entPhysicalName.2 = STRING: internal
ENTITY-MIB::entPhysicalName.3 = STRING: Sensor1

ENTITY-SENSOR-MIB::entPhySensorType.3 = INTEGER: celsius(8)
ENTITY-SENSOR-MIB::entPhySensorType.4 = INTEGER: rpm(10)
ENTITY-SENSOR-MIB::entPhySensorScale.3 = INTEGER: units(9)
ENTITY-SENSOR-MIB::entPhySensorScale.4 = INTEGER: units(9)