System FAN Health status

[diwakar977]

Hi

I need some help in understanding fan status of my switch. I have two WS-C3750X-24S-S in stack. Each of them have one power supply.

Issue started when these switches were restarted few weeks ago. After restarting PRTG sensor for system health fan is showing alarm. On checking switch physically fans are operating on both switches.

Below is the output of show env fan and show env all.  Fan1 and FAN 2 is reported ok but it shows FAN PS-2 is not present alarms me, though it looks like this is referring to redundant power supply and its fan. If it is true, why PRTG sensor is showing alarm on fan status?

_SW#sh env fan
FAN 1 is OK
FAN 2 is OK
FAN PS-1 is OK
FAN PS-2 is NOT PRESENT

_SW#sh env all
FAN 1 is OK
FAN 2 is OK
FAN PS-1 is OK
FAN PS-2 is NOT PRESENT
SYSTEM TEMPERATURE is OK
System Temperature Value: 22 Degree Celsius
System Temperature State: GREEN
Yellow Threshold : 46 Degree Celsius
Red Threshold : 60 Degree Celsius
SW PID Serial# Status Sys Pwr PoE Pwr Watts
--- ------------------ ---------- --------------- ------- ------- -----
1A C3KX-PWR-350WAC DCB1833911B OK Good Good 350/0
1B Not Present
2A C3KX-PWR-350WAC LIT18370FC4 OK Good Good 350/0
2B Not Present

SW Status RPS Name RPS Serial# RPS Port#
-- ------------- ---------------- ----------- ---------
1 Not Present <>
2 Not Present <>

Thanks in advance.

Regards,

Di

[Mark Malone]

Thta looks like a bug theres quite a few known ones that produce that output

As long as your PS is opertaing you should be good

Here is a couple of them there cosmetic so nothing to worry about

Cat3750X Device Manager shows Fan FAULTY if Fan PS is NOT PRESENT

CSCtl42016

Description

Symptom:
3750 switch's Device Manager shows Fan FAULTY on the Dashbord as follows;
FAN1 is OK
FAN2 is OK
FAN3 is OK
FAN4 is FAULTY

Conditions:
FAN PS is not put in the chassis
#sh env all
FAN 1 is OK
FAN 2 is OK
FAN PS-1 is OK
FAN PS-2 is NOT PRESENT

Workaround:
A cosmetic issue and there is no workaround.

PS-FAN falls to FAUTY status after upgrading IOS.

CSCuo97298

Description

Symptom:
PS-FAN falls to FAUTY status after upgrading your IOS software.

The show env stack command displays the following

SWITCH: 1
FAN 1 is OK
FAN 2 is OK
PS-FAN1 is FAULTY
PS-FAN2 is NOT PRESENT
TEMPERATURE is OK
Temperature Value: 35 Degree Celsius
Temperature State: GREEN
Yellow Threshold : 46 Degree Celsius
Red Threshold : 60 Degree Celsius
POWER is OK
RPS is NOT PRESENT

SWITCH: 2
FAN 1 is OK
FAN 2 is OK
PS-FAN1 is FAULTY
PS-FAN2 is NOT PRESENT
TEMPERATURE is OK
Temperature Value: 34 Degree Celsius
Temperature State: GREEN
Yellow Threshold : 46 Degree Celsius
Red Threshold : 60 Degree Celsius
POWER is OK
RPS is NOT PRESENT
---------------------

Conditions:
3750X
15.0(2)SE6

Workaround:
Downgrade to Cisco IOS Release 15.0(2)SE5.

[diwakar977]

Thank you Mark.

But I have not upgraded IOS. Current IOS is 15.0(2)SE5.

FAN PS-2 is NOT PRESENT -> does this refer to redundant power supply or power power supply of second switch in stack?

[Mark Malone]

It effects your IOS as well

• CSCuo97298

On Cisco IOS Release 15.0(2)SE6, the PS-FAN falls to FAUTY status after upgrading the IOS software from Cisco IOS Release 15.0(2)SE5. The show env stack command displays the following output:

SWITCH: 1

FAN 1 is OK

FAN 2 is OK

PS-FAN1 is FAULTY

PS-FAN2 is NOT PRESENT

TEMPERATURE is OK

Temperature Value: 35 Degree Celsius

Temperature State: GREEN

Yellow Threshold : 46 Degree Celsius

Red Threshold : 60 Degree Celsius

POWER is OK

RPS is NOT PRESENT

SWITCH: 2

FAN 1 is OK

FAN 2 is OK

PS-FAN1 is FAULTY

PS-FAN2 is NOT PRESENT

[manasKumar]

HI Mark ,

I have the same issue. I hv 2 3750X sw in a stack , one of the switch is rebooting frequently .

I hv also the same out put.

>>>>

CORE-HO# sh env stack
SWITCH: 1
FAN 1 is OK
FAN 2 is OK
PS-FAN1 is OK
PS-FAN2 is NOT PRESENT
TEMPERATURE is OK
Temperature Value: 25 Degree Celsius
Temperature State: GREEN
Yellow Threshold : 46 Degree Celsius
Red Threshold : 60 Degree Celsius
RPS is NOT PRESENT

SWITCH: 2
FAN 1 is OK
FAN 2 is OK
PS-FAN1 is OK
PS-FAN2 is NOT INITIALIZED
TEMPERATURE is OK
Temperature Value: 22 Degree Celsius
Temperature State: GREEN
Yellow Threshold : 46 Degree Celsius
Red Threshold : 60 Degree Celsius

CORE-HO#sh ev nv all
FAN 1 is OK
FAN 2 is OK
FAN PS-1 is OK
FAN PS-2 is NOT INITIALIZED
SYSTEM TEMPERATURE is OK
System Temperature Value: 21 Degree Celsius
System Temperature State: GREEN
Yellow Threshold : 46 Degree Celsius
Red Threshold : 60 Degree Celsius
SW PID Serial# Status Sys Pwr PoE Pwr Watts
-- ------------------ ---------- --------------- ------- ------- -----
1A C3KX-PWR-350WAC LIT180412YX OK Good Good 350/0
1B Not Present
2A C3KX-PWR-350WAC LIT17070DCT OK Good Good 350/0
2B UNKNOWN unknown No Input Power Bad N/A 0/0

SW Status RPS Name RPS Serial# RPS Port#
-- ------------- ---------------- ----------- ---------
1 Not Present <>
2 Not Present <>

[NareshV]

Hi Mark,

I have also faced the same issue. Fan status is not a faulty but Fan status is OK. but still PRTG is showing the error

Switch3850#sh env fan
Switch 1 FAN 1 is OK
Switch 1 FAN 2 is OK
Switch 1 FAN 3 is OK
FAN PS-1 is OK
FAN PS-2 is NOT PRESENT
Switch 2 FAN 1 is OK
Switch 2 FAN 2 is OK
Switch 2 FAN 3 is OK
FAN PS-1 is OK
FAN PS-2 is NOT PRESENT

PRTG Error: 

SensorSystem Health Fans

 
Warning by lookup value 'Undefined lookup value (0)' in channel 'Fan 2011 State' — Warning by lookup value 'Undefined lookup value (0)' in channel 'Fan 2012 State' — Warning by lookup value 'Undefined lookup value (0)' in channel 'Fan 2013 State' (Queries for the following channel IDs returned no data: 5,6,7 (code: PE269))