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:

1. Check if the PIM has exceeded 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 power tokens for the J2350 router.

   
   user@host> show chassis power-ratings

   Device          Low     Medium   High   Heat    Ratings
                   Power   Power    Power
   Total Tokens    83      83       83     83      -
   FPC 1           6       5        27     21      OK
   FPC 2           3       4        27     18      OK
   FPC 3           0       0        0      0       Empty
   FPC 4           0       0        0      0       Empty
   FPC 5           2       1        0      2       Exceeded
   Tokens Used     12      10       55     42      -
   

   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 but continues to draw minimal power.

2. 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
   • To bring the PIM online without powering off the router, 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 configuration statement. For detailed information about the set chassis fpc offline and set chassis disable_power_management configuration statements, see the JUNOS System Basics Configuration Guide.