Juniper JUNOS OS 10.3 - SOFTWARE Manual page 197

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NOTE: If you cannot access the CLI, you can reboot from the inactive partition
using the following procedure from the loader script prompt:
Unload and clear the interrupted boot from the active partition:
1.
loader> unload
loader> unset vfs.root.mountfrom
Select the new (inactive) partition to boot from:
2.
loader> set currdev=diskmediaspartition:
where is either 0 (internal) or 1 (external) and
media
the partition number, either 1 or 2.
You must include the colon (:) at the end of this command.
Boot Junos OS from the inactive partition:
3.
loader> boot
Installing Software on an EX Series Switch with a Single Routing Engine (CLI Procedure)
on page 78
Installing Software on EX Series Switches (J-Web Procedure) on page 83
Understanding Software Installation on EX Series Switches on page 69
Chapter 8: Troubleshooting Software Installation
partition
indicates
101