WESM zl Management and Configuration Guide WT.01.03 and greater

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Configuring the ProCurve Wireless Edge Services zl Module
System Maintenance
Whatever name you give the file that you save to the Update Server, it should
always contain the same configuration that is saved on the module’s startup-
config. When you change the startup-config, you should immediately copy the
new file to the Update Server.
When you save the startup-config file and the Update Server is enabled, the
Wireless Edge Services zl Module saves a checksum of the startup-config.
When the Wireless Edge Services zl Module reboots, it compares the check-
sum it saved with the checksum of the startup-config that it loads. If the two
checksums match, the module boots normally with the startup-config.
If the startup-config is corrupted, the checksums will not match, and the
module will request the configuration file from the location specified in the
Update Server settings. When the module receives the configuration file from
the Update Server, it compares the checksum that it saved for the startup-
config with this file’s checksum. If the two checksums match, the module
loads the configuration file that it received from the Update Server.
If the two checksums do not match, the module assumes that the Update
Server does not have the correct configuration file. The module boots with
the factory default startup-config.
However, you can configure the Wireless Edge Services zl Module to ignore
the checksum and always use the startup-config file sent by the Update Server.
This option is called forcing the config update.
Avoiding Problems in Using the Update Server
To ensure that the Wireless Edge Services zl Module does not boot with the
wrong software image or the factory default settings, follow these guidelines:
■ Keep the Update Server settings current.
For example, if you upgrade the software image on the Wireless Edge
Services zl Module, you must save the new software image to the Update
Server and change the software image file defined in the module’s Update
Server settings. If the Update Server settings specify an older software
image, the module will attempt to use this older software image the next
time that it is rebooted.
Alternatively, you can also force the Update Server to upload the config-
uration file whether or not the checksum matches. While perhaps less
secure, this option prevents the Wireless Edge Services zl Module from
reverting to factory default settings when you do not follow the above
guidelines exactly.