The SSB is hot-pluggable. You can remove and replace it without powering down the
system; however, this causes major impact to the system. While the SSB is out of the
router, route lookups, system component monitoring, exception and control packet
transfer, and FPC resets cannot occur.
When the SSB is removed, all packet forwarding stops immediately and the Routing
Engine responds by generating alarms. When the SSB is replaced, it is rebooted by flash
EEPROM.
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.
Related
Documentation
Checklist for Monitoring the SSB on page 505•
Monitor the SSB status
If the SSB fails, no information about the chassis components is available through the
CLI.
To monitor the SSB:
1.
Display the SSB Environmental Status on page 508
2.
Display the SSB Detailed Status on page 509
3.
Check the SSB LEDs on page 509
Display the SSB Environmental Status
Purpose To isolate problems in the SSB by checking the environmental status
Action To display the SSB environmental status, use the following 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
Copyright © 2012, Juniper Networks, Inc.508
M Series and T Series Routers Monitoring and Troubleshooting Guide
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