Step 2: Display Component Error Messages in the System Log File

Action

To display component error messages in the messages system log file, use the following JUNOS CLI operational mode command:

user@host> show log messages

Sample Output

user@host> show log messages

[...Output truncated...]

Apr 17 11:12:45 tylenol scb CM: ALARM SET: (Major) Power Supply B fan failed

Apr 17 11:12:46 tylenol scb CM: ALARM CLEAR: Power Supply B fan failed

Apr 17 11:12:46 tylenol alarmd[590]: Alarm cleared: Pwr supply color=RED, 
class=CHASSIS, reason=Power Supply B fan failed

Apr 17 11:13:09 tylenol alarmd[590]: Alarm set: Pwr supply color=RED, 
class=CHASSIS, reason=Power Supply B fan failed

Apr 17 11:13:09 tylenol scb CM: ALARM SET: (Major) Power Supply B fan failed

Apr 17 11:13:10 tylenol alarmd[590]: Alarm cleared: Pwr supply color=RED, 
class=CHASSIS, reason=Power Supply B fan failed

Apr 17 11:13:10 tylenol scb CM: ALARM CLEAR: Power Supply B fan failed

[...Output truncated...]

What It Means

The messages system log file records the time the failure or event occurred, the severity level, a code, and a message description. You can use the date and time to browse the messages log file, or you can use the show log messages | match component-name command to view error messages that are specific to a particular component. For example, the command output shows the common power supply error messages logged from the router. In the filter expression, if there is a space in the component name, enclose the component name in quotation marks, for example | match "power supply".

Use system log file information to isolate a component problem and to let the Juniper Networks Technical Assistance Center (JTAC) know what error messages were generated at the time of the event. For more information about system log messages, see the JUNOS System Log Messages Reference.