Alcatel-Lucent OmniSwitch 6450 Management Manual page 138

CMM Files
Scenario 4: Roll back to Previous Version of Switch Software
Later that year, an upgraded image file is released from Alcatel-Lucent. The network administrator loads
the new file through FTP to the working directory of the switch and reboots the switch from the working
directory. Since the switch is booted from the working directory, the switch is running from the working
directory.
After the reboot loads the new image file from the working directory, it is discovered that the image file
was corrupted during the FTP transfer. Rather than having a disabled switch, the network administrator
can reboot the switch from the certified directory (which has the previous, more reliable version of the
ENI image file) and wait for a new version of the image. In the meantime, the administrator's switch is
still functioning.
This is illustrated in the following diagram:
R W C
1. The new file is
installed in the
working directory.
page 5-8
R W C
2. The new file is
loaded through a
reboot from the
working direc-
tory. The switch is
running from the
working directory.
Switch Rolls Back to Previous File Version
OmniSwitch 6250/6450 Switch Management Guide
Managing CMM Directory Content
R W C
3. The file is cor-
rupted and does
not boot correctly.
R W C
4. Switch reboots
from certified
directory by using
the old file. Since
the working and
certified directo-
ries are not the
same, it will be
running from the
certified directory.
June 2013