Troubleshoot the EX4100-H-12T Switch

This topic contains some common troubleshooting resources for the EX4100-H-12T switch and a list of alarms and how to fix them.

Chassis Component Alarm Conditions on the EX4100-H-12T Switch

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

Table 1 lists the alarms that the chassis components can generate on the EX4100-H-12T 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 the EX4100-H-12T Switch
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.
Temperature	The temperature inside the chassis reached the red alarm limit.	Major	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).
Humidity	The humidity inside the chassis reached the red alarm limit.	Major	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).
Humidity	The humidity inside the chassis reached the yellow alarm limit.	Minor	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 on the EX4100-H-12T 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 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 2 inches (5.08 cm) of clearance around the ventilation openings., refer Environmental Guidelines.

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. Following is a sample output on an EX4100-H-12T switch.

show chassis environment

The following table 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: `Power`: Status of power supply in the switch `Temp`: Temperature of air flowing through the chassis in degrees Celsius (°C) and degrees Fahrenheit (°F) `Humid`: Status of relative humidity in the switch.
`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 `Power`, the status can be: `OK`: The component is operational. `Testing`: The power supply unit is being tested during initial power-on. `Failed`: The power supply unit has failed. `Absent`: The power supply unit is not connected to the switch.
`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 `Humid`, indicates humidity in percent relative humidity.

Issue the command show chassis temperature-thresholds. This command displays the chassis temperature threshold settings. The following is a sample output on an EX4100-H-12T switch. Note that some columns that do not apply to the switch are displayed as N/A or not applicable.

show chassis temperature-thresholds.

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.
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.
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.

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.
Restricted airflow through the switch due to insufficient clearance around the installed switch.	Ensure that there is sufficient clearance around the installed switch. For EX4100-H-12T switches, see Environmental Guidelines.

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