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    Display Redundant SCG Mastership

    If both SCGs are installed and functioning normally, SCG0 is master and SCG1 is backup. Removing the backup SCG does not affect the functioning of the router. Taking the master SCG offline might result in a brief loss of SONET clock lock while the backup SCG becomes master.

    To determine which SCG is operating as the master and which is operating as the standby:

    1. Display the SCG Master and Standby from the Craft Interface Output
    2. View the SCG LEDs

    Display the SCG Master and Standby from the Craft Interface Output

    Purpose

    To determine the SCG master and standby from the craft interface output.

    Action

    To determine the SCG master and SCG standby from the craft interface status information, use the following command:

    user@host> show chassis craft-interface

    Sample Output

    user@host> show chassis craft-interface
    [...Output truncated...] 
    SCG LEDs:
      SCG  0   1
    --------------
    Amber  .   .
    Green  *   *
    Blue   *   .
    [...Output truncated...]
    

    Meaning

    The command output displays which SCG is operating as master. Asterisks (*) indicate the operation status. The color represents the possible SCG operating states: Amber (Fail), Green (OK), and Blue (Master). The SCG in slot 0 is operating as master; the SCG in slot 1 is the backup.

    View the SCG LEDs

    Purpose

    To determine SCG mastership by viewing the SCG LEDs on the SCG faceplate.

    Action

    Check the blue MASTER LED on the SCG faceplate. If this LED is on steadily, the SCG is functioning as master.

    Published: 2012-08-20