This article describes how to clear the "Backup RE Active" chassis alarm on EX9200 Series switches.

The following alarm is reported on EX9200:

root@EX9200> show chassis alarms           
1 alarms currently active
Alarm time               Class  Description
2018-09-04 10:20:24 PDT  Minor  Backup RE Active

root@EX9200> show chassis routing-engine
Routing Engine status:
  Slot 0:
    Current state                  Backup
    Election priority              Master (default)

<output snipped>

Routing Engine status:
  Slot 1:
    Current state                  Master
    Election priority              Backup (default)

The primary Routing Engine may fail and switch over to the backup Routing Engine (RE) due to file system corruption in the RE, which results in the above alarm. The alarm may also be reported when there is internal hardware error, hard disk failure, or hardware failure or when the primary RE is removed or reset and the backup RE takes over.

To clear the alarm, perform the following procedure:

[edit]
root@EX9200# set chassis redundancy routing-engine 1 master

[edit]
root@EX9200# set chassis redundancy routing-engine 0 backup  

[edit]
root@EX9200# show system commit

[edit]
root@EX9200# show chassis
redundancy {
    routing-engine 0 backup;
    routing-engine 1 master;
}

[edit]
root@EX9200# set chassis redundancy graceful-switchover

[edit]
root@EX9200# set system commit synchronize               

[edit]
root@EX9200# commit synchronize 

configuration check succeeds
re0:
commit complete
re1:
commit complete

Wait for one or two minutes and run the following commands to verify the Routing Engine state.

{MASTER} [edit]
root@EX9200> show chassis routing-engine  
Routing Engine status:
  Slot 0:
    Current state                  Backup
    Election priority              Backup
    Temperature                 33 degrees C / 91 degrees F
    CPU temperature             31 degrees C / 87 degrees F
    DRAM                      16330 MB (16384 MB installed)
    Memory utilization          10 percent
    5 sec CPU utilization:
      User                       1 percent
      Background                 0 percent
      Kernel                     0 percent
      Interrupt                  0 percent
      Idle                      99 percent
    Model                          RE-S-EX9200-1800X4
    Serial ID                      9009155788
    Start time                     2018-08-09 18:20:02 PDT
    Uptime                         25 days, 16 hours, 3 minutes, 2 seconds
    Last reboot reason             Router rebooted after a normal shutdown.
    Load averages:                 1 minute   5 minute  15 minute
                                       0.17       0.13       0.15
Routing Engine status:
  Slot 1:
    Current state                  Master
    Election priority              Master
    Temperature                 34 degrees C / 93 degrees F
    CPU temperature             29 degrees C / 84 degrees F
    DRAM                      16330 MB (16384 MB installed)
    Memory utilization           7 percent
<output snipped>
    15 min CPU utilization:
      User                       0 percent
      Background                 0 percent
      Kernel                     1 percent
      Interrupt                  0 percent
      Idle                      99 percent
    Model                          RE-S-EX9200-1800X4
    Serial ID                      9009140140
    Start time                     2018-08-09 17:58:26 PDT
    Uptime                         25 days, 16 hours, 24 minutes, 51 seconds
    Last reboot reason             Router rebooted after a normal shutdown.
    Load averages:                 1 minute   5 minute  15 minute
                                       0.31       0.21       0.12

{MASTER}[edit]
root@EX9200> show chassis alarms
No alarms currently active

2021-04-05: Updated the article terminology to align with Juniper's Inclusion & Diversity initiatives