Chapter 4. Local Console Operation
45
Firmware Upgrade Recovery
There are basically four conditions that call for firmware upgrade recovery:
1. When a firmware upgrade procedure is interrupted due to a power failure
or loss of network connection.
2. When the unit’s firmware becomes corrupted for some reason and you are
unable to operate it.
3. When you invoke Firmware Upgrade Mode (see FIRMWARE UPGRADE,
page 30), but decide not to proceed with the upgrade.
4. When a firmware upgrade procedure fails.
To perform a firmware upgrade recovery, do the following:
1. Slide the Firmware Upgrade Recovery Switch (see page 7) to the Recover
position.
2. Power off and restart the switch according to the instructions given in the
Powering Off and Restarting section (see page 19).
3. Repeat the upgrade procedure starting with Starting the Upgrade, page 41.
4. When the upgrade ends, power off the switch
5. Slide the Firmware Upgrade Recovery Switch back to the Normal
position.
6. Restart the switch according to the instructions given in the Powering Off
and Restarting section (see page 19).
Note: 1. In condition 1, mentioned above, the IP module may fail and require
a special procedure to recover. In that case, see IP Module Firmware
Upgrade Recovery, page 154, for how to proceed.
2. If one of the daisy chained units fails to upgrade, unchain it from the
installation and perform the recovery and upgrade operation on it
independently. After it has been successfully upgraded, plug it back
into the chain.
