Displaying HCM Alarms

If a router with a single HCM fails, no alarm can be sent. If a master HCM fails on a router with dual HCMs and the backup HCM takes over mastership, an alarm is reported on the backup Routing Engine.

When HCM mastership changes because of failure, Routing Engine mastership changes as well.

Action

To view HCM alarms, use the following CLI command:

user@host> show chassis alarms

Sample Output

user@host> show chassis alarms 

4 alarms currently active

Alarm time               Class  Description

2005-02-16 22:10:27 UTC  Minor  Backup RE Active

What It Means

The command output displays a minor alarm indicating that the backup Routing Engine is active or is master. Since the HCM is a companion component of the Routing Engine, the backup HCM is also active. The command output displays the date and time of the alarm.

To verify that the backup HCM has taken over mastership, use the show chassis routing-engine CLI command.

user@host> show chassis routing-engine

Sample Output

user@host> show chassis routing-engine 

Routing Engine status:

  Slot 0:

    Current state                  Backup

    Election priority              Master (default)

    Temperature                 33 degrees C / 91 degrees F

    DRAM                      2048 MB

    Memory utilization          13 percent

    CPU utilization:

      User                       0 percent

      Background                 0 percent

      Kernel                     0 percent

      Interrupt                  0 percent

      Idle                     100 percent

    Model                          RE-3.0

    Serial ID                      P10865703096

    Start time                     2005-02-16 22:13:19 UTC

    Uptime                        2 hours, 13 minutes, 57 seconds

Routing Engine status:

  Slot 1:

    Current state                  Master

    Election priority              Backup (default)

    Temperature                 33 degrees C / 91 degrees F

    CPU temperature             29 degrees C / 84 degrees F

    DRAM                      2048 MB

    Memory utilization          12 percent

    CPU utilization:

      User                       0 percent

      Background                 0 percent

      Kernel                     3 percent

      Interrupt                  0 percent

      Idle                      97 percent

    Model                          RE-3.0

    Serial ID                      P10865701255

    Start time                     2005-02-03 03:13:39 UTC

    Uptime                        13 days, 21 hours, 12 minutes, 35 seconds

    Load averages:                 1 minute   5 minute  15 minute

                                       0.00       0.03       0.01

What It Means

The HCM in the slot labeled HCM0 is paired with the Routing Engine in the slot labeled RE0. Likewise, the HCM in the slot labeled HCM1 is paired with the Routing Engine in the slot labeled RE1. By default, the HCM in the slot labeled HCM0 is the master. However, in this instance, the Routing Engine in slot RE1 has taken over mastership, indicating that the HCM in slot HCM1 is also master.