How to check Fan Failure issues on Cisco Router/Switch

The show environment command can help you monitor and troubleshoot Cisco Router or Switch power and ventilation status. You can issue this command in global Exec mode on Cisco Router or Switch. Find below basic troubleshooting steps and examples of show environment command on different Cisco devices.

If you suspect a fan failure issue, perform these troubleshooting steps:

  1. Check the LEDs. If all the LEDs are off, check the power to the Switch. The fan could have failed due to a power problem.
  2. Check the system LED. If it is amber, the system has detected a problem. If you cannot hear the fan operating, this could indicate a fan problem.

Examples: Execute Show Environment Command to Troubleshoot Fan Failure Issues.

Find output of the show environment command from a Cisco Switch or Router for  troubleshooting.

Note: If you are using a Catalyst 3524-PWR-XL, 2940, 2950 and 2955, 2970, 3550 or 3750 series switch, check the fan for failure by issuing the show environment fan command, as shown in this sample output:

Switch#show environment fan
FAN 1 is OK
FAN 2 is OK
FAN 3 is OK
FAN 4 is FAULTY
FAN 5 is OK

Check/Find Fan Status in Cisco 2811 Router

This is an example of the output of the show environment command for a Cisco 2811 Router that has one AC power supply with IP phone power output installed:

Router# sh environment ?
All       All environmental monitor parameters
Last    Last environmental monitor parameters
table   Temperature and voltage ranges
|         Output modifiers
<cr>

Router# sh environment
Main Power Supply is AC
Fan 1 OK
Fan 2 OK
Fan 3 OK
Fan Speed Setting: Normal System Temperature: 18 Celsius (normal) Environmental information last updated 00:00:24 ago
Router#

Check/Find Fan Status in Cisco 3845 Router

This is an example of the output of the show environment command for a Cisco 3845 Router that has one AC power supply with IP phone power output installed:

Router# show environment

SYS PS1 is present
Fan status: Normal
Input Voltage status: Normal
DC Output Voltage status: Normal
Type: AC
Thermal status: Normal
SYS PS2 is absent
AUX (-48V) PS1 is present
AUX (-48V) PS2 is absent
Fan 1 Normal
Fan 2 Normal
Fan 3 Normal
Fan Speed is Normal
Alert settings:
Intake temperature warning: Enabled, Threshold: 50
Core temperature warning: Enabled, Threshold: 70 (CPU: 90)
Board Temperature: Normal
Internal-ambient temperature = 31, Normal
CPU temperature = 50, Normal
Intake temperature = 25, Normal
Backplane temperature = 24, Normal

Voltage 1(3300) is Normal, Current voltage = 3284 mV
Voltage 2(5150) is Normal, Current voltage = 5210 mV
Voltage 3(2500) is Normal, Current voltage = 2549 mV
Voltage 4(1200) is Normal, Current voltage = 1215 mV

Check/Find Fan Status in Cisco 7606 Router

This is an example of the output of the show environment command for a Cisco 7606 Router that has one AC power supply with IP phone power output installed:

Router#sh environment
environmental alarms:
  no alarms

backplane:
  operating clock count: 2
  operating VTT count: 3

fan-tray 1:
  fan-tray 1 type: FAN-MOD-9SHS
  fan-tray 1 mode: Auto
  fan-tray 1 fan-fail: OK
fan-tray 2:
  fan-tray 2 type: FAN-MOD-9SHS
  fan-tray 2 mode: Auto
  fan-tray 2 fan-fail: OK
VTT 1:
  VTT 1 OK: OK
  VTT 1 outlet temperature: 34C
VTT 2:
  VTT 2 OK: OK
  VTT 2 outlet temperature: 36C
VTT 3:
  VTT 3 OK: OK
  VTT 3 outlet temperature: 34C
clock 1:
  clock 1 OK: OK, clock 1 clock-inuse: in-use
clock 2:
  clock 2 OK: OK, clock 2 clock-inuse: not-in-use
power-supply 1:
  power-supply 1 fan-fail: OK
  power-supply 1 power-input: AC 220V
  power-supply 1 power-output-mode: high
  power-supply 1 incompatible with fan: OK
  power-supply 1 power-output-fail: OK
power-supply 2:
  power-supply 2 fan-fail: OK
  power-supply 2 power-input: AC 220V
  power-supply 2 power-output-mode: high
  power-supply 2 incompatible with fan: OK
  power-supply 2 power-output-fail: OK
module 1:
  module 1 power-output-fail: OK
  module 1 outlet temperature: 35C
  module 1 inlet temperature: 25C
  module 1 device-1 temperature: 25C
  module 1 device-2 temperature: 26C
module 2:
  module 2 power-output-fail: OK
  module 2 outlet temperature: 37C
  module 2 inlet temperature: 30C
  module 2 device-1 temperature: 28C
  module 2 device-2 temperature: 28C
module 3:
  module 3 power-output-fail: OK
  module 3 outlet temperature: 39C
  module 3 inlet temperature: 31C
  module 3 device-1 temperature: 30C
  module 3 device-2 temperature: 30C
module 4:
  module 4 power-output-fail: OK
  module 4 outlet temperature: 41C
  module 4 inlet temperature: 34C
  module 4 device-1 temperature: 32C
  module 4 device-2 temperature: 36C
module 5:
  module 5 power-output-fail: OK
  module 5 outlet temperature: 39C
  module 5 inlet temperature: 32C
  module 5 device-1 temperature: 46C
  module 5 device-2 temperature: 45C
  module 5 asic-1 (SSO-1) temp: 30C
  module 5 asic-2 (SSO-2) temp: 29C
  module 5 asic-3 (SSO-3) temp: 30C
  module 5 asic-4 (SSO-4) temp: 30C
  module 5 asic-5 (SSA-1) temp: 30C
  module 5 asic-6 (HYPERION-1) temp: 30C
  module 5 RP outlet temperature: 38C
  module 5 RP inlet temperature: 34C
  module 5 EARL outlet temperature: 41C
  module 5 EARL inlet temperature: 33C
module 6:
  module 6 power-output-fail: OK
  module 6 outlet temperature: 42C
  module 6 inlet temperature: 30C
  module 6 device-1 temperature: 30C
  module 6 device-2 temperature: 29C
module 7:
  module 7 power-output-fail: OK
  module 7 outlet temperature: 37C
  module 7 inlet temperature: 29C
  module 7 device-1 temperature: 29C
  module 7 device-2 temperature: 29C
  SPA-8X1FE-TX-V2[1/0] temperature sensor 0, reading: 34C
  SPA-8X1FE-TX-V2[1/0] temperature sensor 1, reading: 40C
  SPA-8X1FE-TX-V2[1/0] nominal: 3.300V, reading: 3.294V
  SPA-8X1FE-TX-V2[1/0] nominal: 2.500V, reading: 2.501V
  SPA-8X1FE-TX-V2[1/0] nominal: 1.500V, reading: 1.501V
  SPA-8X1FE-TX-V2[1/0] nominal: 1.200V, reading: 1.200V
  SPA-8X1FE-TX-V2[1/0] nominal: 1.000V, reading: 0.997V
  SPA-8X1FE-TX-V2[1/1] temperature sensor 0, reading: 31C
  SPA-8X1FE-TX-V2[1/1] temperature sensor 1, reading: 37C
  SPA-8X1FE-TX-V2[1/1] nominal: 3.300V, reading: 3.294V
  SPA-8X1FE-TX-V2[1/1] nominal: 2.500V, reading: 2.496V
  SPA-8X1FE-TX-V2[1/1] nominal: 1.500V, reading: 1.496V
  SPA-8X1FE-TX-V2[1/1] nominal: 1.200V, reading: 1.198V
  SPA-8X1FE-TX-V2[1/1] nominal: 1.000V, reading: 0.998V
chassis connector rating: 1680.00 Watts (40.00 Amps @ 42V)
module 1
  module 1 connector rating: 1512.00 Watts (36.00 Amps @ 42V)
  module 1 power consumption: 240.24 Watts ( 5.72 Amps @ 42V)
module 2
  module 2 connector rating: 1512.00 Watts (36.00 Amps @ 42V)
  module 2 power consumption: 105.00 Watts ( 2.50 Amps @ 42V)
module 3
  module 3 connector rating: 1512.00 Watts (36.00 Amps @ 42V)
  module 3 power consumption: 105.00 Watts ( 2.50 Amps @ 42V)
module 4
  module 4 connector rating: 1260.00 Watts (30.00 Amps @ 42V)
  module 4 power consumption: 145.32 Watts ( 3.46 Amps @ 42V)
module 5
  module 5 connector rating: 1260.00 Watts (30.00 Amps @ 42V)
  module 5 power consumption: 340.20 Watts ( 8.10 Amps @ 42V)
module 6
  module 6 connector rating: 1512.00 Watts (36.00 Amps @ 42V)
  module 6 power consumption: 340.20 Watts ( 8.10 Amps @ 42V)
module 7
  module 7 connector rating: 1512.00 Watts (36.00 Amps @ 42V)
  module 7 power consumption: 105.00 Watts ( 2.50 Amps @ 42V)
chassis per slot cooling capacity: 99 cfm
ambient temperature: < 55C
  module 1 cooling requirement: 30 cfm
  module 2 cooling requirement: 30 cfm
  module 3 cooling requirement: 30 cfm
  module 4 cooling requirement: 30 cfm
  module 5 cooling requirement: 35 cfm
  module 6 cooling requirement: 30 cfm
  module 7 cooling requirement: 30 cfm

Check/Find the Fan Status in Cisco 2950 Switch

Switch#sh env ?
all Show all environment status
fan Show fan status
power Show power supply status
rps Show RPS status

Switch#sh env fan
FAN is OK

Switch#

Switch#sh env power
Internal POWER supply is OK

Switch#sh env all
FAN is OK
Internal POWER supply is OK
RPS is NOT present

Switch#

Check the Fan Status in Cisco 2970 Switch

Switch-2970#sh env ?
all Show all environment status
fan Show fan status
power Show power supply status
rps Show RPS status
temperature Show temperature status

Switch-2970#sh env all
FAN is OK
TEMPERATURE is OK
POWER is OK
RPS is NOT PRESENT

Switch-2970#

Check the Fan Status in Cisco 4510R L3 Switch

Cisco-4510R#sh environment
no alarm

Chassis Temperature = 37 degrees Celsius
Chassis Over Temperature Threshold = 75 degrees Celsius
Chassis Critical Temperature Threshold = 95 degrees Celsius

Power Fan Inline
Supply Model No Type Status Sensor Status
—— —————- ——— ———– ——- ——-
PS1 PWR-C45-2800AC AC 2800W good good good
PS2 PWR-C45-2800AC AC 2800W good good good

Power supplies needed by system : 1
Power supplies currently available : 2

Chassis Type : WS-C4510R

Power consumed by backplane : 40 Watts

Supervisor Led Color : Green

Module 1 Status Led Color : Green
Module 3 Status Led Color : Green
Module 4 Status Led Color : Green
Module 5 Status Led Color : Green
Module 6 Status Led Color : Green
Module 7 Status Led Color : Green

Fantray : Good

Power consumed by Fantray : 80 Watts

 

 


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    Nice post but how to configure the SNMP on Cisco devices to get the fan failure logging?

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