The upgrade process is as follows. The user runs an upgrade utility that accepts an input file with a list of access points and their credentials. The utility telnets to the access points in the input file a series of IOS commands to prepare the access point for the upgrade, including the commands to create the self-signed certificates. Also, the utility telnets to the controller to program the device to allow authorization of specific self-signed certificate access points. It then loads Cisco IOS Release 12.3(11)JX1 onto the access point so that it can join the controller. After the access point joins the controller, it downloads a complete IOS version from it. The upgrade utility generates an output file that includes the list of access points and corresponding self-signed certificate key-hash values that can be imported into the WCS management software. The WCS can then send this information to other controllers on the network.
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