Dell S4820T Configuration Manual page 846

Configuring Role-based Only AAA Authorization
You can configure authorization so that access to commands is determined only by the user's role. If the
user has no user role, access to the system is denied as the user will not be able to login successfully.
When you enable role-based only AAA authorization using the aaa authorization role-only command in
Configuration mode, the Dell Networking OS checks to ensure that you do not lock yourself out and that
the user authentication is available for all terminal lines.
Pre-requisites
Before you enable role-based only AAA authorization:
1. Locally define a system administrator user role. This will give you access to login with full
permissions even if network connectivity to remote authentication servers is not available.
2. Configure login authentication on the console. This ensures that all users are properly identified
through authentication no matter the access point.
If you do not configure login the authentication on the console, the system displays an error when
you attempt to enable role-based only AAA authorization.
3. Specify an authentication method list (RADIUS, TACACS+, or Local).
You must specify at least local authentication. For consistency, the best practice is to define the
same authentication method list across all lines, in the same order of comparison; for example VTY
and console port.
You could also use the default authentication method to apply to all the LINES (console port, VTY).
NOTE: The authentication method list should be in the same order as the authorization
method list. For example, if you configure the authentication method list in the following order
(TACACS+, local), Dell Networking recommends that authorization method list is configured in
the same order (TACACS+, local).
4. Specify authorization method list (RADIUS, TACACS+, or Local). You must at least specify local
authorization.
For consistency, the best practice is to define the same authorization method list across all lines, in
the same order of comparison; for example VTY and console port.
You could also use the default authorization method list to apply to all the LINES (console port, VTY).
If you do not, the following error is displayed when you attempt to enable role-based only AAA
authorization.
% Error: Exec authorization must be applied to more than one line to be
useful, e.g. console and vty lines. Could use default authorization method
list as alternative.
5. Verify the configuration has been applied to the console or VTY line.
Dell (conf)#do show running-config line
!
line console 0
login authentication test
authorization exec test
exec-timeout 0 0
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