The alarm and component status is helpful to know if you are troubleshooting a power supply or a Telco closet ventilation issue. Temperature sensors in the chassis monitor the temperature within the chassis. The system raises an alarm if the fan fails or if the temperature inside the chassis rises above permitted levels.

Note: The solution provided in this article is also available in the Technical Documentation:   Troubleshooting Temperature Alarms in EX Series Switches

The EX-series switch generates a temperature alarm such as "FPC 0 EX-PFE1 Temp Too Hot".

The solution below provides information for checking current status, evaluating what is generating the alarm, understanding the alarm, and determining the appropriate action required.

Temperature sensors in the chassis monitor the temperature within the chassis. The system raises an alarm if the fan fails or if the temperature inside the chassis rises above permitted levels.

1. Telnet or SSH into your switch as you would normally.

2. Issue the operational command show chassis environment . This command will display environmental information about the switch chassis, including temperature and information about fans, power supplies, and the Routing Engine (note that all example output values will be different depending on the product).

user@switch> show chassis environment

Class Item                           Status   Measurement
Power FPC 0 Power Supply 0           OK       
      FPC 0 Power Supply 1           Absent   
Temp  FPC 0 CPU                      OK       41 degrees C / 105 degrees F
      FPC 0 EX-PFE1                  OK       45 degrees C / 113 degrees F
      FPC 0 EX-PFE2                  OK       44 degrees C / 111 degrees F
      FPC 0 GEPHY Front Left         OK       33 degrees C / 91 degrees F
      FPC 0 GEPHY Front Middle       OK       35 degrees C / 95 degrees F
      FPC 0 GEPHY Front Right        OK       33 degrees C / 91 degrees F
      FPC 0 Uplink Conn              OK       34 degrees C / 93 degrees F
Fans  FPC 0 Fan 1                    OK       Spinning at normal speed

Output Fields:

• Power - Information about the Power Entry Modules. Status can be OK, Testing (during initial power-on), Failed, or Absent.

• Temp - Temperature of the air flowing through the chassis

• Fans - Information about the fans and blowers. Status can be OK, Testing (during initial power-on), Failed, or Absent. Measurement indicates if spinning at normal or high speed. 

To prevent the switch from overheating, do not operate it in an area that exceeds the maximum recommended ambient temperature. For the EX series, refer to  Environmental Requirements and Specifications for EX Series Switches .

3. Issue the show chassis temperature-thresholds command to display chassis temperature threshold settings.

user@switch> show chassis temperature-thresholds

                           Fan speed        Yellow alarm         Red alarm
Item                     Normal   High    Normal   Bad fan    Normal   Bad fan
FPC 0 CPU                    60     70        80        70        95      85
FPC 0 EX-PFE1                60     70        80        70        95      85
FPC 0 EX-PFE2                60     70        80        70        95      85
FPC 0 GEPHY Front Left       60     70        80        70        95      85
FPC 0 GEPHY Front Middle     60     70        80        70        95      85
FPC 0 GEPHY Front Right      60     70        80        70        95      85
FPC 0 Uplink Conn            60     70        80        70        95      85 

Output Fields:

• Item - Chassis component

• Fan speed - The temperature threshold settings for the fans to operate at normal and high speeds. An alarm is not triggered until the temperature exceeds the threshold settings for a yellow alarm or a red alarm.

  1. Normal - The fans operate at normal speed if the component is at or below this temperature and all the fans are present and functioning normally.
  2. High - The fans operate at high speed if the component has exceeded this temperature or a fan has failed or is missing.

• Yellow alarm - The temperature threshold settings that trigger a yellow alarm

  1. Normal - The component has exceeded this temperature and the fans have been turned on to full speed.
  2. Bad fan - The component has exceeded this temperature and one or more fans have failed or are missing.

• Red alarm - The temperature threshold settings that trigger a red alarm

  1. Normal - The component has exceeded this temperature and the fans have been turned on to full speed.
  2. High - The component has exceeded this temperature and one or more fans have failed or are missing. 

2020-02-13: Article reviewed for accuracy; no changes required.

2019-07-12: Content reviewed for accuracy.  Link to Environmental Requirements added.