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Taking an MX240 Host Subsystem Offline

To take a host subsystem offline:

Determine whether the host subsystem is functioning as the master or as the backup, using one of the two following methods:
- Check the Routing Engine LEDs on the craft interface. If the green RE MASTER LED is lit, the corresponding host subsystem is functioning as the master.
- Issue the following command. The master Routing Engine is designated Master in the Current state field:
  user@host> show chassis routing-engine
```
Routing Engine status:      Slot 0:     Current state                 Master ...  
```
If the host subsystem is functioning as the master, switch it to backup using the command:
user@host> request chassis routing-engine master switch
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 CLI Explorer.
Note: The SCB might continue forwarding traffic for approximately 5 minutes after the request system halt command has been issued.