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play_arrow Fast Track: Initial Installation
- Fast Track to Rack Installation and Power
- Claim, Onboard, and Configure EX4000
play_arrow System Overview and Specifications
play_arrow Site Planning and Preparation
play_arrow Installation and Configuration
play_arrow Maintain Components
- Maintain Fiber-Optic Cables
- Maintain Transceivers
play_arrow Troubleshoot Hardware
- Troubleshoot Alarm Conditions of EX4000
play_arrow Contact Customer Support and Return the Chassis or Components
- Contacting Customer Support
- Return an EX4000 Chassis or Component
play_arrow Safety and Compliance Information

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Troubleshoot Alarm Conditions of EX4000

date_range 19-Feb-25

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Chassis Component Alarm Conditions on EX4000 Switches

This topic describes the chassis component alarm conditions on EX4000 switches.

Table 1 lists the alarms that the chassis components can generate on EX4000 switches. The table lists the severity levels of these alarms and the actions that you can take to respond to them.

Table 1: Chassis Component Alarm Conditions on EX4000 Switches
Chassis Component	Alarm Condition	Alarm Severity	Remedy
Temperature	The temperature inside the chassis reached the yellow or amber alarm limit.	Minor	Check the fan and chassis environment cooling condition. Open a support case using the Case Manager link at https://www.juniper.net/support/, or call 1-888-314-5822 (toll-free within the United States and Canada) or 1-408-745-9500 (from outside the United States).
Temperature	The temperature inside the chassis reached the red alarm limit.	Major	Check the fan and chassis environment cooling condition. Open a support case using the Case Manager link at https://www.juniper.net/support/, or call 1-888-314-5822 (toll-free within the United States and Canada) or 1-408-745-9500 (from outside the United States).
Management Ethernet interface	The Management Ethernet link is down.	Major	Check whether a cable is connected to the Management Ethernet interface or whether the cable is defective. Replace the cable, if required. If you are unable to resolve the problem, open a support case using the Case Manager link at https://www.juniper.net/support/, or call 1-888-314-5822 (toll-free within the United States and Canada) or 1-408-745-9500 (from outside the United States).
Routing Engine	The /var partition usage is high.	Minor	Clean up the system file storage space on the switch. For more information, see Freeing Up System Storage Space.
	The /var partition is full.	Major	Clean up the system file storage space on the switch. For more information, see Freeing Up System Storage Space.
	The feature usage requires a license, or the license for the feature usage has expired. Note: If alarm ignore is not present then only this alarm should be reported. Under factory default condition, this alarm will be ignored	Minor	Install the required license for the feature specified in the alarm. For more information, see Understanding Software Licenses for EX Series Switches.

Troubleshoot Temperature Alarms in EX Series Switches

Note:

This topic is a generic one and applies to all EX Series Switches. There could be variations in output depending on the switch.

Problem
Cause
Solution

Problem

Description

EX Series switches trigger a temperature alarm FPC 0 EX-PFE1 Temp Too Hot when the switch temperature becomes too hot.

Cause

Temperature sensors in the chassis monitor the temperature of the chassis. The switch triggers an alarm if a fan fails or if the temperature of the chassis exceeds permissible levels for some other reason.

Solution

When the switch triggers a temperature alarm such as the FPC 0 EX-PFE1 Temp Too Hot alarm, use the show chassis environment and the show chassis temperature-thresholds commands to identify the condition that triggered the alarm.

CAUTION:

To prevent the switch from overheating, operate it in an area with an ambient temperature within the recommended range. To prevent airflow restriction, allow at least 6 inches (15.2 cm) of clearance around the ventilation openings.

Connect to the switch by using Telnet, and issue the show chassis environment command. This command displays environmental information about the switch chassis, including the temperature. The command also displays information about the fans, power supplies, and Routing Engines. Following is a sample output on an EX4000 switch.

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user@switch> show chassis environment

Class Item                           Status     Measurement
Power FPC 0 Power Supply 0           OK
Temp  FPC 0 Thermal board Sensor 1   OK         38 degrees C / 100 degrees F
      FPC 0 Thermal board Sensor 2   OK         28 degrees C / 82 degrees F
      FPC 0 Thermal board Sensor 3   OK         27 degrees C / 80 degrees F
      FPC 0 PFE Die Sensor           OK         38 degrees C / 100 degrees F
      FPC 0 PoE Controller Sensor 1  OK         22 degrees C / 71 degrees F
      FPC 0 PoE Controller Sensor 2  OK         30 degrees C / 86 degrees F
      FPC 0 PoE Controller Sensor 3  OK         23 degrees C / 73 degrees F
      FPC 0 PoE Controller Sensor 4  OK         27 degrees C / 80 degrees F
      FPC 0 PoE Controller Sensor 5  OK         22 degrees C / 71 degrees F
      FPC 0 PoE Controller Sensor 6  OK         28 degrees C / 82 degrees F
      FPC 0 PoE Controller Sensor 7  OK         26 degrees C / 78 degrees F
      FPC 0 PoE Controller Sensor 8  OK         26 degrees C / 78 degrees F
      FPC 0 PoE Controller Sensor 9  OK         25 degrees C / 77 degrees F
      FPC 0 PoE Controller Sensor 10 OK         27 degrees C / 80 degrees F
      FPC 0 PoE Controller Sensor 11 OK         27 degrees C / 80 degrees F
      FPC 0 PoE Controller Sensor 12 OK         23 degrees C / 73 degrees F
Fans  FPC 0 Fan Tray 0 Fan 0         OK         Spinning at normal speed
      FPC 0 Fan Tray 1 Fan 0         OK         Spinning at normal speed
      FPC 0 Fan Tray 2 Fan 0         OK         Spinning at normal speed

Table 2 lists the output fields for the show chassis environment command. The table lists output fields in the approximate order in which they appear.

Table 2: `show chassis environment` Output Fields
Field Name	Field Description
`Class`	Information about the category or class of chassis component: `Temp`: Temperature of air flowing through the chassis in degrees Celsius (°C) and degrees Fahrenheit (°F) `Fans`: Information about the status of fans and blowers
`Item`	Information about the chassis components: Flexible PIC Concentrators (FPCs)—the line cards Control Boards (CBs)—Thermal Board Sensor, PFE Die Sensor, PoE Controller Sensor Power supply units Fan Tray
`Status`	Status of the specified chassis component. For example, if `Class` is `Fans`, the fan status can be: `OK`: The fans are operational. `Testing`: The fans are being tested during initial power-on. `Failed`: The fans have failed or the fans are not spinning. `Absent`: The fan tray is not installed.
`Measurement`	Depends on the Class. For example, if `Class` is `Temp`, indicates the temperature in degrees Celsius (°C) and degrees Fahrenheit (°F). If the `Class` is `Fans`, indicates actual fan RPM.

Issue the command show chassis temperature-thresholds. This command displays the chassis temperature threshold settings. The following is a sample output on an EX4000 switch.

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user@ host> show chassis temperature-thresholds

                                        Fan speed      Yellow alarm      Red alarm      Fire Shutdown
                                       (degrees C)      (degrees C)     (degrees C)      (degrees C)
Item                                  Normal  High   Normal  Bad fan   Normal  Bad fan     Normal
FPC 0 Thermal board Sensor 1              40    59       70       70       75       75         80
FPC 0 Thermal board Sensor 2              45    65       70       70       75       75         80
FPC 0 Thermal board Sensor 3              33    52       60       60       65       65         70
FPC 0 PFE Die Sensor                      75    99      100      100      105      105        110
FPC 0 PoE Controller Sensor 1             45    70      115      115      120      120        125
FPC 0 PoE Controller Sensor 2             45    70      115      115      120      120        125
FPC 0 PoE Controller Sensor 3             45    70      115      115      120      120        125
FPC 0 PoE Controller Sensor 4             45    70      115      115      120      120        125
FPC 0 PoE Controller Sensor 5             45    70      115      115      120      120        125
FPC 0 PoE Controller Sensor 6             45    70      115      115      120      120        125
FPC 0 PoE Controller Sensor 7             45    70      115      115      120      120        125
FPC 0 PoE Controller Sensor 8             45    70      115      115      120      120        125
FPC 0 PoE Controller Sensor 9             45    70      115      115      120      120        125
FPC 0 PoE Controller Sensor 10            45    70      115      115      120      120        125
FPC 0 PoE Controller Sensor 11            45    70      115      115      120      120        125
FPC 0 PoE Controller Sensor 12            45    70      115      115      120      120        125

Table 3lists the output fields for the show chassis temperature-thresholds command. The table lists output fields in the approximate order in which they appear.

Table 3: `show chassis temperature-thresholds` Output Fields
Field Name	Field Description
Item	Chassis component. Displays temperature threshold information for the chassis components.
Fan speed	Temperature thresholds, in degrees Celsius, for the fans to operate at normal and at high speed. Normal—The temperature threshold at which the fans operate at normal speed and when all the fans are present and functioning normally. High—The temperature threshold at which the fans operate at high speed or when a fan has failed or is missing. Note: An alarm is triggered when the temperature exceeds the threshold settings for a yellow, amber, or red alarm.
Yellow or amber alarm	Temperature threshold, in degrees Celsius, that triggers a yellow or amber alarm. Normal—The temperature threshold that must be exceeded on the device to trigger a yellow or amber alarm when the fans are running at full speed. Bad fan—The temperature threshold that must be exceeded on the device to trigger a yellow or amber alarm when one or more fans have failed or are missing.
Red alarm	Temperature threshold, in degrees Celsius, that triggers a red alarm. Normal—The temperature threshold that must be exceeded on the device to trigger a red alarm when the fans are running at full speed. Bad fan—The temperature threshold that must be exceeded on the device to trigger a red alarm when one or more fans have failed or are missing.
Fire shutdown	Temperature threshold, in degrees Celsius, at which the switch shuts down to prevent overheating of chassis and a potential fire incident.

When a temperature alarm is triggered, you can identify the condition that triggered it by running the show chassis environment command to display the chassis temperature values for each component and comparing those with the temperature threshold values. You can display the temperature threshold values by running the show chassis temperature-thresholds command.

Table 4 lists the possible causes for the switch to generate a temperature alarm. It also lists the respective remedies.

Table 4: Causes and Remedies for Temperature Alarms
Cause	Remedy
Ambient temperature is above threshold temperature.	Ensure that the ambient temperature is within the threshold temperature limit. See Environmental Requirements and Specifications for EX Series Switches.
Fan module or fan tray has failed.	Perform the following steps: Check the fan. If the above two checks show no problems, open a support case using the Case Manager link at https://www.juniper.net/support/ or call 1-888-314-5822 (toll-free within the United States and Canada) or 1-408-745-9500 (from outside the United States).
Restricted airflow through the switch due to insufficient clearance around the installed switch.	Ensure that there is sufficient clearance around the installed switch.

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