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play_arrow Fast Track: Initial Installation
- Fast Track to Rack Installation and Power
- Claim, Onboard, and Configure EX4100-F
play_arrow System Overview and Specifications
play_arrow Site Planning and Preparation
play_arrow Initial Installation and Configuration
play_arrow Maintain Components
- Maintain Transceivers
- Maintain Fiber-Optic Cables
play_arrow Troubleshoot Hardware
- Troubleshoot the EX4100-F Components
play_arrow Contact Customer Support and Return the Chassis or Components
- Contacting Customer Support
- Return an EX4100-F Chassis
play_arrow Safety and Compliance Information

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Troubleshoot the EX4100-F Components

date_range 31-Jan-24

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Chassis Component Alarm Conditions on EX4100-F Switches

This topic describes the chassis component alarm conditions on EX4100-F switches.

Table 1 lists the alarms that the chassis components can generate on EX4100-F 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 EX4100-F Switches
Chassis Component	Alarm Condition	Alarm Severity	Remedy
Power supply	A power supply has been removed from the chassis.	Minor	Install a power supply in the empty slot.
	A power supply output has failed.	Major	Check the power supply output connection.
	A power supply has failed.	Major	Replace the failed power supply.
	An unknown power supply is installed.	Major	Install a power supply recommended by Juniper Networks.
	A mix of power supplies with different airflow directions is installed.	Major	Do not mix power supplies with different airflow directions in the same chassis.
	A mix of fan modules and power supplies with different airflow directions is installed.	Major	Do not mix fan modules and power supplies with different airflow directions in the same chassis.
Fan module	A fan module is not installed.	Major	Install the fan module.
	A fan module has failed.	Major	Replace the fan module.
	A mix of fan modules with different airflow directions is installed.	Major	Do not mix fan modules with different airflow directions in the same chassis.
	A mix of fan modules and power supplies with different airflow directions is installed.	Major	Do not mix fan modules and power supplies with different airflow directions in the same chassis.
Temperature	The temperature inside the chassis reached the yellow or amber alarm limit.	Minor	Check the fan. 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. 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.
	A rescue configuration is not set.	Minor	Use the `request system configuration rescue save` command to set the rescue configuration.
	The feature usage requires a license, or the license for the feature usage has expired.	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

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 EX9208 switch. The output is similar on other EX Series switches.

show chassis environment (EX9208 Switch)

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user@switch> show chassis environment

Class Item                           Status     Measurement
Temp  PEM 0                          OK         40 degrees C / 104 degrees F
      PEM 1                          OK         40 degrees C / 104 degrees F
      PEM 2                          Absent
      PEM 3                          Absent
      Routing Engine 0               OK         37 degrees C / 98 degrees F
      Routing Engine 0 CPU           OK         35 degrees C / 95 degrees F
      Routing Engine 1               Absent
      Routing Engine 1 CPU           Absent
      CB 0 Intake                    OK         36 degrees C / 96 degrees F
      CB 0 Exhaust A                 OK         34 degrees C / 93 degrees F
      CB 0 Exhaust B                 OK         40 degrees C / 104 degrees F
      CB 0 ACBC                      OK         39 degrees C / 102 degrees F
      CB 0 XF A                      OK         46 degrees C / 114 degrees F
      CB 0 XF B                      OK         45 degrees C / 113 degrees F
      CB 1 Intake                    Absent
      CB 1 Exhaust A                 Absent
      CB 1 Exhaust B                 Absent
      CB 1 ACBC                      Absent
      CB 1 XF A                      Absent
      CB 1 XF B                      Absent
      FPC 3 Intake                   OK         48 degrees C / 118 degrees F
      FPC 3 Exhaust A                OK         46 degrees C / 114 degrees F
      FPC 3 Exhaust B                OK         51 degrees C / 123 degrees F
      FPC 3 XL TSen                  OK         67 degrees C / 152 degrees F
      FPC 3 XL Chip                  OK         58 degrees C / 136 degrees F
      FPC 3 XL_XR0 TSen              OK         67 degrees C / 152 degrees F
      FPC 3 XL_XR0 Chip              OK         51 degrees C / 123 degrees F
      FPC 3 XL_XR1 TSen              OK         67 degrees C / 152 degrees F
      FPC 3 XL_XR1 Chip              OK         63 degrees C / 145 degrees F
      FPC 3 XQ TSen                  OK         67 degrees C / 152 degrees F
      FPC 3 XQ Chip                  OK         63 degrees C / 145 degrees F
      FPC 3 XQ_XR0 TSen              OK         67 degrees C / 152 degrees F
      FPC 3 XQ_XR0 Chip              OK         68 degrees C / 154 degrees F
      FPC 3 XM TSen                  OK         67 degrees C / 152 degrees F
      FPC 3 XM Chip                  OK         76 degrees C / 168 degrees F
      FPC 3 XF TSen                  OK         67 degrees C / 152 degrees F
      FPC 3 XF Chip                  OK         75 degrees C / 167 degrees F 
      FPC 3 PLX PCIe Switch TSe      OK         51 degrees C / 123 degrees F
      FPC 3 PLX PCIe Switch Chi      OK         54 degrees C / 129 degrees F
      FPC 3 Aloha FPGA 0 TSen        OK         51 degrees C / 123 degrees F
      FPC 3 Aloha FPGA 0 Chip        OK         70 degrees C / 158 degrees F
      FPC 3 Aloha FPGA 1 TSen        OK         51 degrees C / 123 degrees F
      FPC 3 Aloha FPGA 1 Chip        OK         75 degrees C / 167 degrees F
      FPC 5 Intake                   Testing
      FPC 5 Exhaust A                Testing
      FPC 5 Exhaust B                Testing
Fans  Top Rear Fan                   OK         Spinning at intermediate-speed
      Bottom Rear Fan                OK         Spinning at intermediate-speed
      Top Middle Fan                 OK         Spinning at intermediate-speed
      Bottom Middle Fan              OK         Spinning at intermediate-speed
      Top Front Fan                  OK         Spinning at intermediate-speed
      Bottom Front Fan               OK         Spinning at intermediate-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)—that is, the line cards Control Boards (CBs) Routing Engines Power entry modules (PEMs)—that is, the power supplies
`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 EX9208 switch. The output is similar on other EX Series switches.

show chassis temperature-thresholds (EX9208 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
Chassis default  48    54       65       55       80       65        100
Routing Engine 0 70    80       95       95      110      110        112
FPC 3            55    60       75       65      105       80        110
FPC 5            55    60       75       65       90       80         95

Table 3 lists 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. You can configure the threshold information for components such as the chassis, the Routing Engines, and FPC for each slot in each FRU to display in the output. By default, information is displayed only for the chassis and the Routing Engines.
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 in case of fire.

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.

For example, for FPC 3:

If the temperature of FPC 3 exceeds 55° C, the output indicates that the fans are operating at a high speed (no alarm is triggered).
If the temperature of FPC 3 exceeds 65° C, a yellow alarm is triggered to indicate that one or more fans have failed.
If the temperature of FPC 3 exceeds 75° C, a yellow alarm is triggered to indicate that the temperature threshold limit is exceeded.
If the temperature of FPC 3 exceeds 80° C, a red alarm is triggered to indicate that one or more fans have failed.
If the temperature of FPC 3 exceeds 105° C, a red alarm is triggered to indicate that the temperature threshold limit is exceeded.
If the temperature of FPC 3 exceeds 110° C, the switch is powered off.

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. Replace the faulty fan module or fan tray. 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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