Alain,
The clear port-security sticky is available only on the "smaller" platforms (2940, 2950, 2955, 2960, 2970, 3550, 3560, 3750, but not on the higer end platforms, such as the Cat4500 and Cat6500.
The reason not to include this command was "clear" command is to be used for dynamic addresses only. Any configured addresses should be cleared via the [no] form of the corresponding commands."
Regards,
~JG
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