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Back Up the Router's Software

As a preventive measure in case any problems occur during an upgrade, issue the request system snapshot command on each Routing Engine to back up the system software to the router’s hard disk. The following is an example of issuing the command on the master Routing Engine:

{master}

user@host> request system snapshot

Verifying compatibility of destination media partitions...
Running newfs (220MB) on hard-disk media / partition (ad1s1a)...
Running newfs (24MB) on hard-disk media /config partition (ad1s1e)...
Copying '/dev/ad0s1a' to '/dev/ad1s1a' .. (this may take a few minutes)
Copying '/dev/ad0s1e' to '/dev/ad1s1e' .. (this may take a few minutes)
The following filesystems were archived: / /config

Note: The root file system is backed up to /altroot, and /config is backed up to /altconfig. After you issue the request system snapshot command, the router’s flash and hard disks are identical. You can return to the previous version of the software only by booting the router from removable media. For more information about the request system snapshot command, see the JUNOS System Basics Configuration Guide.

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