Juniper PTX5000 Hardware Manual page 494

2. If the Routing Engine to be replaced is currently functioning as the primary, switch it to backup by
using the CLI command:
user@host> request chassis routing-engine master switch
warning: Traffic will be interrupted while the PFE is re-initialized
Toggle mastership between Routing Engines ? [yes,no] (no) yes
Resolving mastership...
Complete. The other Routing Engine becomes the master.
3. Halt the host subsystem.
user@host> request vmhost halt
*** FINAL System shutdown message from user@host ***
System going down IMMEDIATELY
Terminated
...
syncing disks... 11 8 done
The operating system has halted.
Please press any key to reboot.
NOTE: The request vmhost halt command halts the Routing Engine on the control plane from
which it was issued. The command shuts down the Routing Engine cleanly, so its state
information is preserved. The SIBs might continue forwarding traffic for approximately 5
minutes after the request vmhost halt command has been issued. To reboot a Routing Engine
that has been halted, you must connect through the console.
On the console or other management device connected to the other Routing Engine, enter CLI
operational mode and issue the following command.
user@host> request chassis cb offline slot
n is 0 or 1 for the slot number of the host subsystem being taken offline.
n
476