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Taking the Host Subsystem Offline

The host subsystem is taken offline and brought online as a unit. Before you replace an SCB or a Routing Engine, you must take the host subsystem offline. The host subsystem is hot-pluggable, but taking the host subsystem offline causes the device to shut down.

To take a host subsystem offline:

  1. On the console or other management device connected to the Routing Engine that is paired with the SCB you are removing, enter CLI operational mode and issue the following command. The command shuts down the Routing Engine cleanly, so its state information is preserved:
    user@host> request system halt

    Wait until a message appears on the console confirming that the operating system has halted.

    For more information about the command, see the JUNOS System Basics and Services Command Reference.

    Note: The SCB might continue forwarding traffic for approximately 5 minutes after the request system halt command has been issued.

  2. Wait until a message appears on the console confirming that the operating system has halted.

    For more information about the command, see the JUNOS System Basics and Services Command Reference.

    Note: The SCB might continue forwarding traffic for approximately 5 minutes after the request system halt command has been issued.


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