Description

This KB addresses the chassis alarm : "FPC(x) offlined due to unreachable destinations" observed under "show chassis alarms".

Symptoms

Example log messages in the "show chassis alarms" output

You may observe the following log messages in the show chassis alarms output:

lab@lab-router> show chassis alarms

2 alarms currently active

Alarm time    Class Description

XXXX-XX-XX xx:xx:xx XXX Major FPC 0 offlined due to unreachable destinations


Sample log messages and "show chassis log messages" outputs for these events:

During such occurrences, the following logs and show chassis outputs can be seen:


Jun XX XX:XX:XX XXXX xxxxx chassisd[7393]: CHASSISD_FRU_TO_SNMP_INDEX_ERROR: snmp_fru_to_bidx: fru_name:SIB: fru_type:8

Jun XX XX:XX:XX XXXX xxxxx craftd[8483]: Receive FX craftd set alarm message: color: 2 class: 100 object: 116 slot: 0 silent: 0 short_reason=SIB 0 FPC Links long_reason=SIB 0 FPC Link Error id=201326708 reason=201326592

Jun XX XX:XX:XX XXXX xxxxx craftd[8483]: Minor alarm set, SIB 0 FPC Link Error

Jun XX XX:XX:XX XXXX xxxxx alarmd[8482]: Alarm set: SIB id=201326708, color=YELLOW, class=CHASSIS, reason=SIB 0 FPC Link Error

Jun XX XX:XX:XX XXXX xxxxx chassisd[7393]: CHASSISD_FM_ACTION_PLANE_OFFLINE: Fabric sib 0 offline initiated to attempt healing of the fabric down condition.

Jun XX XX:XX:XX XXXX xxxxx chassisd[7393]: CHASSISD_FRU_OFFLINE_NOTICE: Taking SIB 0 offline: Fabric down

Jun XX XX:XX:XX XXXX xxxxx chassisd[7393]: CHASSISD_FM_ACTION_PLANE_ONLINE: Fabric sib 0 online initiated to attempt healing of the fabric down condition.

Sample "show chassis fpc" output:

lab@XXXX> show chassis fpc detail

Slot 0 information:
  State                               Offline
  Reason                              FPC offlined due to unreachable destinations
  Error code                       2162869
  Temperature                      24 degrees C / 75 degrees F
  Total CPU DRAM                    0 MB
  Total SRAM                        0 MB
  Total SDRAM                       0 MB

 

Solution

Before proceeding with RMA for the FPC (linecard), please follow the procedures below:

  1. Check Related Events
    Review any related events that occurred at or just before the log message to gather hints on the possible cause of the problem.

  2. Reboot / Reseat the FPC (Linecard)

    • Soft Restart: Use the following command to perform a soft restart:
      request chassis fpc slot <slot-number> (offline | online | restart)
    • Hard Reseat: Physically remove and reinsert the FPC during a maintenance window. Ensure the FPC module is clean when reinserted.
  3. Stabilization
    Wait for the FPC to stabilize before concluding it to be a hardware issue, especially if the FPC or router was recently rebooted.

Helpful Commands for Troubleshooting:

  • show chassis fabric fpcs
  • show chassis fabric plane
  • show chassis fabric plane-location
  • show chassis fabric map
  • show chassis fabric summary
  • show log messages
  • show chassis fpc
  • show system alarms

SRX Reference KB - KB35789 [juniper.net]

For any assistance in understanding these log outputs or for more information regarding this issue, please contact JTAC (Juniper Technical Assistance Center).

Modification History

16-09-2024 - New KB writtern.