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page 4-8 OmniSwitch 6600 Family Switch Management Guide March 2005
Scenario 4: Rollback to Previous Version of Switch Software
Later that year, an upgraded image file is released from Alcatel. The network administrator loads the new
file via FTP to the working directory of the switch and reboots the switch from the working directory.
Since the switch is specifically 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 below:
Switch Rolls Back to Previous File Version
RWC
RWC
RWC
RWC
1. The new file is
installed in the
working directory.
2. The new file is
loaded via a
reboot from the
working direc-
tory. The switch is
running from the
working directory.
3. The file is cor-
rupted and doesn’t
boot correctly.
4. Switch reboots
from certified
directory using old
file. Since the
working and certi-
fied directories are
not the same, it
will be running
from the certified
directory.