How to Troubleshoot Error Conditions

You have troubleshooting resources available through Junos OS alarm messages and LED indicators. You can use these links to discover what these alarms and indicators mean when an error occurs.

To troubleshoot a the router, you use the Junos OS CLI, alarms, and LEDs on the network ports, management panel of the Routing Control Board (RCB), and components.

• LEDs—When the Routing Engine detects an alarm condition, it lights the red or yellow alarm LED on the management panel as appropriate. In addition, you can use component LEDs and network port LEDs to troubleshoot the router.

• CLI—The CLI is the primary tool used to flow and troubleshoot hardware, Junos OS, routing protocols, and network connectivity. CLI commands display information from routing tables, information specific to routing protocols, and information about network connectivity derived from the ping and traceroute utilities. For information about using the CLI to troubleshoot Junos OS, see the appropriate Junos OS configuration guide.

• JTAC—If you need assistance during troubleshooting, you can contact the Juniper Networks Technical Assistance Center (JTAC) by using the Web or by telephone. If you encounter software problems, or problems with hardware components not discussed here, contact JTAC.

• Knowledge Base articles—Knowledge Base.

When a Routing Engine detects an alarm condition, it lights the red or yellow alarm LED on the RCB management panel as appropriate. To view a more detailed description of the alarm cause, issue the show system alarms CLI command, which indicates major and minor alarms on the system.

In this example, a fan tray error occurred in slot 4.

You can also use the variations of the show system errors command to find key information about the error.

• show system errors active—Displays current active errors in the system

• show system errors active fpc—Displays active errors for line cards

• show system errors count—Displays system-wide errors and current count

• show system errors fru detail—Displays detailed FRU-specific error

• show system errors fru detail fpc—Displays information about detected errors based on the FRU

This example shows not only the current errors but also those that are cleared.

Chassis alarms indicate a failure of the device or one of its components. Chassis alarms are preset and cannot be modified.

Chassis alarms on the router have two severity levels:

• Major (red)—Indicates a critical situation on the device that has resulted from one of the conditions described in Table 1. A red alarm condition requires immediate action.

• Minor (yellow or amber)—Indicates a noncritical condition on the device that, if left unchecked, might cause an interruption in service or degradation in performance. A yellow alarm condition requires monitoring or maintenance.

Table 1 describes the chassis alarm messages on the router.

Table 1: Chassis Component Alarm Conditions

Chassis Component	Alarm Condition	Alarm Severity	Remedy
Routing Control Board	An RCB has failed.	Major (red)	Replace the failed RCB.
	An RCB has been removed.	Minor (yellow)	Install an RCB in the empty slot.
Line cards	A line card is offline.	Minor (yellow)	Check the line card. Remove and reinstall the line card. If this fails, replace the failed card.
	A line card has failed.	Major (red)	Replace the failed line card.
	A line card has been removed.	Major (red)	Install a line card in the empty slot.
Fan trays	A fan tray has been removed from the chassis.	Major (red)	Install the missing fan tray.
	One fan in the chassis is not spinning or is spinning below required speed.	Major (red)	Replace the fan tray.
	A fan is not receiving power from the fan tray controller.	Major (red)	Check and replace the failed fan tray controller if required.
Fan Tray Controller	A fan tray controller has failed.	Minor (yellow)	Check and replace the failed fan tray controller if required.
	One of the fan tray controllers in the chassis is not receiving enough power.	Major (red)	Check the power supply.
Switch Interface Boards (SIBs)	One of the SIBs has failed.	Minor (yellow)	Check the below: The SIB is not receiving power. The fan tray controller is having a power problem.
Ethernet	The Ethernet management interface on the RCB is down.	Minor (yellow)	Check the interface cable connection. Reboot the system. If the alarm recurs, open a support case using the Case Manager link at https://www.juniper.net/support/ or call 1-888-314-5822 (toll free, US & Canada) or 1-408-745-9500 (from outside the United States).
Hot swapping	Too many hot-swap interrupts are occurring.	Major (red)	Replace the failed components.
Power supplies	A power supply has been removed from the chassis.	Minor (yellow)	Install a power supply in the empty slot.
	A power supply has a high temperature.	Major (red)	Replace the failed power supply.
	A power supply input has failed.	Major (red)	Check power supply input connection and the power cord.
	A power supply output has failed.	Major (red)	Check power supply output connection.
	A power supply has failed.	Major (red)	Replace the failed power supply.
	AC and DC power supplies are installed.	Major (red)	Do not mix AC and DC power supplies.
	Inadequate number of power supplies.	Major (red)	Install an additional power supply.
Temperature	The chassis temperature has exceeded 104° F (40° C), the fans have been turned on to full speed, and one or more fans have failed.	Minor (yellow)	Check room temperature. Check airflow. Replace the fan tray.
	The chassis temperature has exceeded 149° F (65° C), and the fans have been turned on to full speed.	Minor (yellow)	Check room temperature. Check airflow. Check the fans.
	The chassis temperature has exceeded 149° F (65° C), and a fan has failed. If this condition persists for more than 90 seconds, the router will shut down.	Major (red)	Check room temperature. Check airflow. Check the fan.
	Chassis temperature has exceeded 167° F (75° C). If this condition persists for more than 90 seconds, the router will shut down.	Major (red)	Check room temperature. Check airflow. Check fan.
	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, US & Canada) or 1-408-745-9500 (from outside the United States).