CLI Guide

Security Commands 932
Command Mode
Global Configuration mode
User Guidelines
The default and optional list names created with the aaa authentication
enable command are used with the enable authentication command.
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 to authenticate the administrator. Only
the RADIUS or TACACS methods can return an error. For example, if none is
specified as an authentication method after radius, no authentication is used
if the RADIUS server is down.
To ensure that the authentication succeeds even if all methods return an
error, specify none as the final method in the command line. Note that enable
will not succeed for a privilege level one administrator if no authentication
method is defined. A privilege level one administrator must authenticate to
get to Privileged Exec mode.
NOTE: Requests sent by the switch to a RADIUS server include the username
“$enabx$”, where x is the requested privilege level in decimal. For enable to be
authenticated on RADIUS servers, add “$enabx$” users to them. The login user ID
is also sent to TACACS+ servers for enable authentication.
Example
The following example configures enable authentication to use the enable
method for accessing higher privilege levels.
console(config)# aaa authentication enable default enable
aaa authentication login
Use the aaa authentication login command in Global Configuration mode to
create and enable the authentication method required for administrative
access to the switch. To return to the default configuration and optionally
delete an authentication list, use the no form of this command.