Lenovo RackSwitch G8264 Application Manual page 53

Note: Access to each user level (except admin account) can be disabled by setting
the password to an empty value. To disable admin account, use the command
no access user administrator­enable. The Admin account can be disabled
only if there is at least one user account enabled and configured with administrator
privilege.
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© Copyright Lenovo 2016 Chapter 1: Switch Administration