Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 473

(TACACS+) client/server authentication systems. For RADIUS and TACACS+, an OS10 switch acts as a client and sends authentication requests to a server that contains all user authentication and network service access information. A RADIUS or TACACS+ server provides accounting, authentication (user credentials verification), and authorization (user privilege-level) services. You can configure the security protocol used for different login methods and users. The server uses a list of authentication methods to define the types of authentication and the sequence in which they apply. By default, only the local authentication method is used. The authentication methods in the method list are executed in the order in which they are configured. You can re-enter the methods to change the order. The local authentication method must always be in the list. If a console user logs in with RADIUS or TACACS+ authentication, the privilege-level you configured for the user on the RADIUS or TACACS+ server is applied. NOTE: You must configure the group name (level) on the RADIUS server using the vendor-specific attribute or the authentication fails. • Configure the AAA authentication method in CONFIGURATION mode. aaa authentication {local | radius | tacacs} - local - Use the username and password database defined in the local configuration. - radius - (Optional) Use the RADIUS servers configured with the radius-server host command as the primary authentication method. - tacacs - (Optional) Use the TACACS+ servers configured with the tacacs-server host command as the primary authentication method. Configure AAA authentication OS10(config)# aaa authentication radius local User re-authentication To prevent users from accessing resources and performing tasks for which they are not authorized, OS10 allows you to require users to reauthenticate by logging in again when an authentication method or server changes, such as: • Adding or removing a RADIUS server (radius-server host command) • Adding or removing an authentication method (aaa authentication {local | radius} command) You can enable this feature so that user re-authentication is required when any of these actions are performed. In these cases, logged-in users are logged out of the switch and all OS10 sessions are terminated. By default, user re-authentication is disabled. Enable user re-authentication • Enable user re-authentication in CONFIGURATION mode. aaa re-authenticate enable Enter the no form of the command to disable user re-authentication. Password strength By default, the password you configure with the username password command must be at least nine alphanumeric characters. To increase password strength, you can create password rules using the password-attributes command. When you enter the command, at least one parameter is required. When you enter the character-restriction parameter, at least one option is required. • Create rules for stronger passwords in CONFIGURATION mode. password-attributes {[min-length number] [character-restriction {[upper number] [lower number][numeric number] [special-char number]}} System management 473