Dell PowerConnect PC5524 Reference Manual page 222

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Default Configuration
The enable password command is the default authentication login method.
This is the same as entering the command aaa authentication enable default
enable.
On a console, the enable password is used if a password exists. If no password
is set, authentication still succeeds. This is the same as entering the
command aaa authentication enable default enable none.
Command Mode
Global Configuration mode
User Guidelines
The default and additional list names created with the aaa authentication
enable command are used with the enable authentication command.
All aaa authentication enable default requests sent by the device to a
RADIUS or TACACS+ server include the username $enabx$., where x is the
requested privilege level.
Create a list by entering the aaa authentication enable list-name method
command where list-name is any character string used to name this list. The
method argument identifies the list of methods that the authentication
algorithm tries, in the given sequence.
The additional methods of authentication are used only if the previous
method returns an error, not if it fails. Specify none as the final method in the
command line to ensure that the authentication succeeds even if all methods
return an error.
Example
The following example sets the enable password for authentication for
accessing higher privilege levels.
Console(config)#
aaa authentication enable default enable
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AAA Commands