JUNOS Internet Software Network Operations Guide: Hardware
408 ! Monitoring the SSB Status
If you have removed the Routing Engine, the SSB enters a warm shutdown mode
and continues its forwarding process for a limited time using a frozen forwarding
table. The time limit is determined by a timer in the SSB. If you replace the Routing
Engine during the warm shutdown period, the SSB unfreezes its forwarding tables
and resumes normal functioning. Otherwise, the SSB shuts down.
Monitoring the SSB Status
If the SSB fails, no information about the chassis components is available through
the JUNOS software command-line interface (CLI).
Steps To Take To monitor the SSB, follow these steps:
1. Display the SSB Environmental Status on page 408
2. Display the SSB Detailed Status on page 409
3. Check the SSB LEDs on page 409
Step 1: Display the SSB Environmental Status
Action To display the SSB environmental status, use the following CLI command:
user@host> show chassis environment
Sample Output
user@host>
show chassis environment
Class Item Status Measurement
Power Power Supply A Failed
Power Supply B OK
Temp FPC Slot 0 OK 27 degrees C / 80 degrees F
FPC Slot 1 OK 30 degrees C / 86 degrees F
FPC Slot 2 OK 26 degrees C / 78 degrees F
FPC Slot 3 OK 25 degrees C / 77 degrees F
Power Supply A OK 28 degrees C / 82 degrees F
Power Supply B OK 24 degrees C / 75 degrees F
SSB Slot 0 OK 25 degrees C / 77 degrees F
Backplane OK 21 degrees C / 69 degrees F
Fans Rear Fan OK Spinning at normal speed
Upper Fan OK Spinning at normal speed
Middle Fan OK Spinning at normal speed
Bottom Fan OK Spinning at normal speed
Misc Craft Interface OK
What It Means The command output displays the SSB status and temperature. The SSB status can
be
OK, Failed, or Absent.
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