Upgrade The Routing Engine; Install The Routing Engine Into The Scbe3-Mx - Juniper MX240 Hardware Manual

Upgrade the Routing Engine

If you are upgrading to the SCBE3-MX from an SCBE2-MX or older SCB, the Routing Engine must be
upgraded to the first supported Junos release for the SCBE3-MX (18.4R1) before you install it in the
SCBE3-MX. Also, we recommend that you update the recovery snapshot with the 18.4R1 or later image
before you begin the upgrade. If the Routing Engine fails to boot from the primary image, it will attempt
to boot from the recovery image. Since the older recovery image does not support the SCBE3-MX, the
Routing Engine will crash if it attempts to boot from the old recovery image.
CAUTION:
Junos to 18.4R1 or later, Junos might crash and go to a db prompt. Should this occur,
you'll need to recover the router by copying the Junos software image for the 18.4R1
or later release and then booting from the USB drive to install 18.4R1 Junos on the
SCBE3-MX. The USB install will wipe out the router configuration and all user files on
the Routing Engine.
To upgrade the Routing Engine while it's plugged into an SCBE2-MX or older SCB:
1. Download the software related to your MX Series Routing Engine.
2. If you have not already done so, connect to the console port on the switch from your management
device, and log in to the Junos OS CLI.
3. (Optional) Back up the current software configuration to a second storage option. See the
Installation and Upgrade Guide
4. Install the new software.
5. Reboot the Routing Engine and wait for it to boot with the new Routing Engine image.
6. Install the SCBE3-MX into the Router Chassis. See:
Installing an MX240 Switch Control Board on page 402
Installing an MX480 Switch Control Board
Installing an MX960 Switch Control Board

Install the Routing Engine into the SCBE3-MX

Refer to the Routing Engine installation procedure for your MX model:
"Installing an MX240 Routing Engine" on page 290
If you plug the Routing Engine into the SCBE3-MX without first upgrading
for instructions on performing this task.
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Junos OS