Specifications

NOTE: Before upgrading, back up the file system and the currently active

Junos OS configuration so that you can recover to a known, stable

environment in case the upgrade is unsuccessful. Issue the following

command:

user@host> request system snapshot

The installation process rebuilds the file system and completely reinstalls

Junos OS. Configuration information from the previous software installation

is retained, but the contents of log files might be erased. Stored files on the

routing platform, such as configuration templates and shell scripts (the only

exceptions are the juniper.conf and ssh files) might be removed. To preserve

the stored files, copy them to another system before upgrading or

downgrading the routing platform. For more information, see the Junos OS

Administration Library for Routing Devices.

Migration, Upgrade, and Downgrade Instructions