Step 1: Check the Redundant Control Board Environmental Status

Action

To check the redundant Control Board environmental status, use the following CLI command:

user@host> show chassis environment cb

Sample Output

t640@host> show chassis environment cb 

CB 0 status:

  State                           Online Master

  Temperature                  29 degrees C / 84 degrees F

  Power:

    1.8 V                    1805 mV

    2.5 V                    2501 mV

    3.3 V                    3293 mV

    4.6 V                    4725 mV

    5.0 V                    5032 mV

    12.0 V                  11975 mV

    3.3 V bias               3286 mV

    8.0 V bias               7589 mV

  GBUS Revision                40

  FPGA Revision                 7

CB 1 status:

  State                           Online Standby

  Temperature                  32 degrees C / 89 degrees F

  Power:

    1.8 V                    1802 mV

    2.5 V                    2482 mV

    3.3 V                    3289 mV

    4.6 V                    4720 mV

    5.0 V                    5001 mV

    12.0 V                  11946 mV

    3.3 V bias               3274 mV

    8.0 V bias               7562 mV

  GBUS Revision                40

  FPGA Revision                 7

What It Means

The command output displays which Control Board is master and standby. Additionally, the command output displays the Control Board state, redundancy status, temperature, power source, and circuitry revision level for each Control Board installed in the router chassis. CB1 is shown in standby mode, and is the redundant Control Board.

Alternative Action

To display the environmental status of a particular Control Board, use the following JUNOS CLI operational mode command:

t640@host> show chassis environment cb slot