Quick Reference Guide

886 PowerConnect B-Series TI24X Configuration Guide
53-1002269-02
Configuring TACACS/TACACS+ security
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NOTE
For examples of how to define authentication-method lists for types of authentication other than
TACACS/TACACS+, refer to “Configuring authentication-method lists” on page 907.
Entering privileged EXEC mode after a Telnet or SSH login
By default, a user enters User EXEC mode after a successful login through Telnet or SSH.
Optionally, you can configure the device so that a user enters Privileged EXEC mode after a Telnet
or SSH login. To do this, use the following command.
PowerConnect(config)# aaa authentication login privilege-mode
Syntax: aaa authentication login privilege-mode
The user privilege level is based on the privilege level granted during login.
Configuring enable authentication to prompt for password only
If Enable authentication is configured on the device, when a user attempts to gain Super User
access to the Privileged EXEC and CONFIG levels of the CLI, by default he or she is prompted for a
username and password. You can configure the device to prompt only for a password. The device
uses the username entered at login, if one is available. If no username was entered at login, the
device prompts for both username and password.
To configure the device to prompt only for a password when a user attempts to gain Super User
access to the Privileged EXEC and CONFIG levels of the CLI.
PowerConnect(config)# aaa authentication enable implicit-user
Syntax: [no] aaa authentication enable implicit-user
Telnet/SSH prompts when the TACACS+ Server is unavailable
When TACACS+ is the first method in the authentication method list, the device displays the login
prompt received from the TACACS+ server. If a user attempts to login through Telnet or SSH, but
none of the configured TACACS+ servers are available, the following takes place:
• If the next method in the authentication method list is "enable", the login prompt is skipped,
and the user is prompted for the Enable password (that is, the password configured with the
enable super-user-password command).
• If the next method in the authentication method list is "line", the login prompt is skipped, and
the user is prompted for the Line password (that is, the password configured with the enable
telnet password command).
Configuring TACACS+ authorization
Devices support TACACS+ authorization for controlling access to management functions in the CLI.
Two kinds of TACACS+ authorization are supported:
• Exec authorization determines a user privilege level when they are authenticated
• Command authorization consults a TACACS+ server to get authorization for commands entered
by the user