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play_arrow Fast Track: Initial Installation
- Fast Track to Rack Installation and Power
- Claim, Onboard, and Configure EX4400
play_arrow System Overview and Specifications
play_arrow Site Planning and Preparation
play_arrow Installation and Configuration
play_arrow Maintain Components
play_arrow Troubleshoot Hardware
- Troubleshoot the EX4400 Components
play_arrow Contact Customer Support and Return the Chassis or Components
- Return an EX4400 Chassis or Components
play_arrow Safety and Compliance Information

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Troubleshoot the EX4400 Components

date_range 20-Sep-24

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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. For example, in a fan less switch such as EX4100-H-12MP, any fan related information does not apply.

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. For EX4100-H-12MP switches, refer Table 2.

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. Note that for fan less switches such as EX4100-H-12MP, fan output will not display in the output.

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

Table 1: `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 2 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 2: `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 3 lists the possible causes for the switch to generate a temperature alarm. It also lists the respective remedies.

Table 3: 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.	Note: This step is not applicable for fan less switches such as EX4100-H-12MP 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.

Chassis Component Alarm Conditions on EX4400 Switches

In this topic, you'll learn about alarm conditions on the components installed in the EX4400 switch chassis.

Table 4 lists the alarms that the chassis components can generate on EX4400 switches, their severity levels, and the actions you can take to respond to them.

Table 4: Alarm Conditions on EX4400 Switches
Chassis Component	Alarm Condition	Alarm Severity	Remedy
Fan modules	Fan module is not installed.	Major (red)	Install the fan module.
	Mix of fan modules with different airflow directions.	Major (red)	Do not mix fan modules with different directions for the airflow in the same chassis.
	Mix of fan modules and power supplies with different airflow directions.	Major (red)	Do not mix fan modules and power supplies with different directions for the airflow in the same chassis.
Power supplies	A power supply is removed from the chassis.	Major (red)	Install a power supply in the empty slot.
	The power supply is not switched on.	Minor (yellow)	Check the input connection to the power supply.
	An unknown power supply is installed.	Major (red)	Install a power supply recommended by Juniper Networks.
	Mix of power supplies with different airflow directions.	Major (red)	Do not mix power supplies with different airflow directions in the same chassis.
	Mix of fan modules and power supplies with different airflow directions.	Major (red)	Do not mix fan modules and power supplies with different airflow directions in the same chassis.
Temperature	The temperature inside the chassis reaches the yellow alarm limit.	Minor (yellow)	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).
	The temperature inside the chassis reaches the red alarm limit.	Major (red)	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).
	The temperature sensor has failed.	Major (red)	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	Management Ethernet link is down.	Major (red)	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, then 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	/var partition usage is high.	Minor (yellow)	Clean up the system file storage space on the switch. For more information, see Freeing Up System Storage Space.
	/var partition is full.	Major (red)	Clean up the system file storage space on the switch. For more information, see Freeing Up System Storage Space.
	Rescue configuration is not set.	Minor (yellow)	Use the `request system configuration rescue save` command to set the rescue configuration.
	Feature usage requires a license or the license for the feature usage has expired.	Minor (yellow)	Install the required license for the feature specified in the alarm. For more information, see Understanding Software Licenses for EX Series Switches.

EX4400 Switch Hardware and CLI Terminology Mapping

This topic describes the hardware terms used in EX4400 switch documentation and the corresponding terms used in the Junos OS CLI (see Table 5.

Table 5: CLI Equivalents of Terms Used in the Documentation for EX4400 Switches
Hardware Item (CLI)	Description (CLI)	Value	Item In Documentation	Additional Information
Chassis	One of the following: EX4400-24T EX4400-24P EX4400-24MP EX4400-24X EX4400-48T EX4400-48P EX4400-48MP EX4400-48F	-	Switch chassis	EX4400 Models and Specifications
Routing Engine (`n`)	One of the following: RE-EX4400-24T RE-EX4400-24P RE-EX4400-24MP RE-EX4400-24X RE-EX4400-48T RE-EX4400-48P RE-EX4400-48MP RE-EX4400-48F	`n` is a value in the range 0 through 9. In a standalone switch, the default value is 0. In a Virtual Chassis configuration, the values correspond to the member IDs of switches configured in the primary role and the backup role in the Virtual Chassis.	Routing Engine	-
FPC (`n`)	Abbreviated name of the Flexible PIC Concentrator (FPC) One of the following: EX4400-24T EX4400-24P EX4400-24MP EX4400-24X EX4400-48T EX4400-48P EX4400-48XP EX4400-48MXP EX4400-48MP EX4400-48F	`n` is a value in the range 0 through 9.		Understanding Interface Naming Conventions
		In a standalone switch, the default value is 0.	In this case, FPC refers to the switch itself.
		In a Virtual Chassis configuration, the values correspond to the assigned member IDs of switches in the Virtual Chassis.	In this case, the FPC number refers to the member ID assigned to the switch.
PIC (`n`)	Abbreviated name of the Physical Interface Card (PIC)	`n` is a value in the range 0 through 2.		Understanding Interface Naming Conventions
	One of the following: EX4400-24T or EX4400-24P switch: `24x10M/100M/1G` EX4400-24MP switch: `24x100M/1G/2.5G/5G/10G Base-T` EX4400-24X switch: `24x 1G/10G SFP/SFP+` EX4400-48T or EX4400-48P switch: `48x10M/100M/1G` EX4400-48XP switch:`48x10M/100M/1G` EX4400-48MP switch: `36x100M/1G/2.5G Base-T & 12x100M/1G/2.5G/5G/10G Base-T` EX4400-48MXP switch:`36x 10M/100M/1G/2.5G & 12x 100M/1/2.5/5/10G` EX4400-48F switch: `36x1G SFP, 12x1G/10G SFP/SFP+`	PIC 0	PIC 0 stands for built-in network ports numbered 0 through 23 or 0 through 47	EX4400 System Overview
	One of the following: 2x100G QSFP28 VCP 2x100G QSFP28 (EX4400-24X)	PIC 1	QSFP28 ports numbered 0 and 1
	One of the following: 4x10G SFP+ 4x25G SFP28 1x100G QSFP28	PIC 2	Extension module installed in the switch	Extension Modules in EX4400 Switches
Xcvr (`n`)	Abbreviated name of the transceiver	`n` is a value equivalent to the number of the port in which the transceiver is installed.	Optical transceivers	Pluggable Transceivers and Cables Supported on EX4400 Switches
Power supply (`n`)	One of the following: JPSU-550-C-AC-AFO JPSU-550-C-AC-AFI JPSU-550-C-DC-AFO JPSU-550-C-DC-AFI JPSU-1050-C-AC-AFO JPSU-1600-C-AC-AFO JPSU-2000-C-AC-AFO	`n` has a value 0 or 1, corresponding to the power supply slot number.	AC power supply or DC power supply	AC Power Supply in EX4400 Switches DC Power Supply in EX4400 Switches
Fan tray	One of the following: Fan Module, Airflow In (AFI) Fan Module, Airflow Out (AFO)	`n` has a value 0 or 1, corresponding to the fan module slot number.	Fan module	Cooling System and Airflow in an EX4400 Switch

CLI Equivalents of Terms Used in the Documentation for EX4400 Switches

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