topic Re: WLC 5520 - OctTempMonitor message in Wireless

WLC 5520 - OctTempMonitor message

WGL_BK — Mon, 05 Jul 2021 19:39:23 GMT

Hello all, I've got another question. My 5520 has been flooding syslog with this message:

*OctTempMonitor: env_monitor.c:101 Check sensor fail: Octeon Temperature, errno 0, errstring Success

So far I haven't seen where it negatively affects the performance of the device. The operating temperatures seem ok (it's in a well cooled server room):

Operating Environment............................ Commercial (10 to 35 C)
Internal Temp Alarm Limits....................... 10 to 38 C
Internal Temperature............................. +15 C
Fan Status....................................... OK

I haven't been able to locate this error online yet. Has anyone ever seen it before? Is it cause for alarm?

Re: WLC 5520 - OctTempMonitor message

Mark Elsen — Sat, 17 Oct 2020 05:35:21 GMT

- This looks like a bug. You may upgrade to advisory release if applicable , feasible , available and or not yet done. Check if the problem persists afterwards.

Re: WLC 5520 - OctTempMonitor message

Rich R — Sat, 17 Oct 2020 13:32:47 GMT

We've actually got a TAC case open for this on 8540 at the moment. Wireless Network Business Unit dev team are thinking about it ...

We think it's a WLC software bug because a reboot clears the problem. It appears to me that the WLC loses connection with the CIMC (or IMM as they still call it). CIMC can still see the sensors fine. Side effect is that because WLC can't read the CIMC sensors it sets the fans to full speed to prevent possible overheating so increases wear on the fans.

If it's the same problem that we're seeing then you'll get zero response to the show imm chassis commands:

(wlc) >show imm chassis fan

(wlc) >show imm chassis fan-profile

(wlc) >show imm chassis temperature

(wlc) >

But on CIMC:

WLC-CIMC# scope sensor

WLC-CIMC /sensor # show fan

Name Sensor Status Reading Units Min. Warning Max. Warning Min. Failure Max. Failure

-------------------- -------------------- ---------- ---------- --------------- --------------- --------------- ---------------

FAN1_SPEED Normal 17100 RPM 1600 N/A 1200 N/A

FAN2_SPEED Normal 16000 RPM 1600 N/A 1200 N/A

FAN3_SPEED Normal 16000 RPM 1600 N/A 1200 N/A

FAN4_SPEED Normal 17100 RPM 1600 N/A 1200 N/A

FAN5_SPEED Normal 16000 RPM 1600 N/A 1200 N/A

FAN6_SPEED Normal 17100 RPM 1600 N/A 1200 N/A

WLC-CIMC /sensor #

You might also see RAID failures which Cisco have previously told us are hardware failures (RMA) but which I suspect might be linked with the same problem because they also clear after reboot:

RAID Volume Status

Drive 0.......................................... Good

Drive 1.......................................... Bad

They're considering re-opening https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvd63113 for it although they closed the original bug because they couldn't reproduce the problem or work out what triggers it 🙂

@Mark Elsenthere is no fix for it at this point but reboot will usually clear it if it's not a genuine hardware failure.

Re: WLC 5520 - OctTempMonitor message

WGL_BK — Tue, 20 Oct 2020 16:56:25 GMT

Thank you for this feedback. I'm not very versed on IMM and CIMC however I have tried the imm commands you shared and I get no feedback - in fact there's a noticeable pause at the CLI.

How can we move forward if there's no workaround or plans to release bug-fixes?

Re: WLC 5520 - OctTempMonitor message

WGL_BK — Sat, 24 Apr 2021 03:26:06 GMT

Hello, were you able to get to the bottom of this? I haven't seen a change since and I'm wondering if could possibly cause some issue down the road.