98 CHAPTER 11: SOFTWARE UPGRADE AND INSTALLATION
The configuration of the Webcache is preserved after a software upgrade
has been performed; you do not have to re-configure the settings.
3Com recommends that you configure the Webcache to automatically
detect new software versions.
Software Upgrade
SNMP Traps
An SNMP Trap is sent to your network management station when any of
the following events occur:
■ When the software upgrade server is not available and automatic
software upgrade detection is enabled.
■ A new software upgrade is detected.
■ A software upgrade is successful.
If the software upgrade is completed successfully, the trap indicates
that the upgrade has been successful and tells you what software
version the Webcache is now running.
■ A software upgrade fails.
If the software upgrade is completed unsuccessfully, the trap indicates
that the upgrade has been unsuccessful and tells you why it failed.
For more information about SNMP Traps, see “SNMP Traps” on page 85.
Unsuccessful
Software Upgrades
The Webcache software upgrade process is robust and guards against an
upgrade failure. Should a software upgrade fail, the Webcache will
automatically revert to using the software version that was installed
before the upgrade was started. The upgrade process is resilient to power
failure, network failure or system failure. Prior to offering an automatic
software upgrade, the Webcache will download the new software
version onto temporary storage on the Webcache, ensuring that the
complete software image file is available before commencing the
upgrade.
Detecting Software
Upgrades
To configure the detection of software upgrades using the Web interface:
1 Click Device View on the Toolbar.
2 Select System > Control > Upgrade Settings in the Navigation Tree.
