[ Contents] [ Prev] [ Next] [ Index] [ Report an Error]

Troubleshooting Hardware Components

This section contains the following topics:

Monitoring and Correcting Chassis Alarm Conditions
Troubleshooting Power Management

Monitoring and Correcting Chassis Alarm Conditions

You can monitor alarms to troubleshoot hardware problems on a Services Router. Alarms alert you to conditions on the router chassis, or in the system software that might prevent the router from operating normally. You can monitor active alarms from the J-Web interface or the CLI.

Services Router alarms warn you about conditions that can prevent the router from operating normally. Chassis and system alarm conditions are preset. When the Routing Engine detects an alarm condition, it lights the ALARM LED on the front panel. When the condition is corrected, the light turns off.

To view a more detailed description of the alarm cause, issue the show chassis alarms CLI command:

user@host> show chassis alarms

Table 45 describes alarms that can occur for a chassis component such as the Routing Engine or a Physical Interface Module (PIM).

Table 45: Chassis Alarm Conditions and Corrective Actions

Component	Alarm Conditions	Corrective Action	Alarm Severity
Alternative boot media	The Services Router boots from an alternative boot device.	Typically, the router boots from the internal compact flash. If you configured your router to boot from an alternative boot device, ignore this alarm condition. If you did not configure the router to boot from an alternative boot device, contact JTAC. (See Requesting Technical Support.)	Yellow (minor)
PIM	A PIM has failed. When a PIM fails, it attempts to reboot. If the Routing Engine detects that a PIM is rebooting too often, it shuts down the PIM.	Replace the failed PIM. (See Replacing a PIM)	Red (major)
Routing Engine	An error occurred during the process of reading or writing compact flash.	Reformat the compact flash and install a bootable image. (See the JUNOS Software Administration Guide.) If this remedy fails, you must replace the failed Routing Engine. To contact JTAC, see Requesting Technical Support.	Yellow (minor)
	Routing Engine temperature is too warm.	Check the room temperature. (See Router Environmental Tolerances.) Check the air flow. (See General Site Guidelines.) Check the fans. If you must replace a fan or the Routing Engine, contact JTAC. (See Requesting Technical Support.) If the router has an air filter, check the filter and replace it if it appears clogged. (See Replacing Air Filters on J2350 Routersor Replacing Air Filters on J4350 and J6350 Routers.)	Yellow (minor)
	Routing Engine fan has failed.	Replace the failed fan. To contact JTAC, see Requesting Technical Support.	Red (major)

Troubleshooting Power Management

If one or more PIMs remain offline when you power on the chassis, the combination of PIMs installed might exceed the power and heat capacity of the chassis. For information about the maximum power and heat tokens permitted for each chassis, see Planning for Power Management.

To bring the PIM online:

Check if the PIM exceeds the power and heat tokens permitted by issuing the show chassis fpc and show chassis power-ratings CLI commands:

user@host> show chassis fpc

Temp  CPU Utilization (%)   Memory    Utilization (%)
Slot State            (C)  Total  Interrupt      DRAM (MB) Heap     Buffer
  0  Online          -------------------- CPU less FPC --------------------
  1  Online          -------------------- CPU less FPC --------------------
  2  Online          -------------------- CPU less FPC --------------------
  3  Empty
  4  Empty
  5  Offline         ------ Hardware exceeds High Power token limits ------

In this example, J Series power management has placed the PIM in slot 5 in an offline state to prevent damage. If brought online, the PIM would cause the combination of PIMs to exceed the maximum limit of 83 high-power tokens for the J2350 router.

user@host> show chassis power-ratings

Device     Low     High     Heat   Ratings
                Power   Power
Total Tokens    83      83       83     -
FPC 1           6       27       21     OK
FPC 2           3       27       18     OK
FPC 3           3       27       18     OK
FPC 4           0       0        0      OK
FPC 5           2       27       2      Exceeded
Tokens Used     14      108      59     -

Note: In the show chassis power-ratings command output, the PIM slot number is reported as an FPC number.

The offline PIM is not powered off and continues to draw minimal power.

To bring the PIM online, you have the following options:

Remove one or more PIMs from the chassis. This option requires that you power off the router. For more information about removing PIMs, see Removing a PIM
Bring the PIM online without powering off the router. To do so, use the set chassis fpc offline command to set another PIM slot in the chassis to the offline state. For example:

user@host# set chassis fpc 2 offline

If the power and heat tokens no longer exceed the maximum, the PIMs that were placed offline by J Series power management are brought online automatically.

Use the set chassis disable-power-management command to disable J Series power management:

user@host# set chassis disable-power-management

Caution: Use extreme caution when disabling J Series power management. To prevent equipment damage, do not install a combination of PIMs that exceeds the power or heat capacity of your router when J Series power management is disabled.

The set chassis disable-power-management command brings the offline PIMs online automatically.

To reenable J Series power management, remove the set chassis disable-power-management command from the configuration. For detailed information about the set chassis fpc offline and set chassis disable-power-management commands, see the JUNOS System Basics Configuration Guide.

[ Contents] [ Prev] [ Next] [ Index] [ Report an Error]