Concept Guide

NOTE: If a console user logs in with RADIUS authentication, the privilege level is applied from the RADIUS server if the privilege
level is congured for that user in RADIUS, whether you congure RADIUS authorization.
NOTE: RADIUS and TACACS servers support VRF-awareness functionality. You can create RADIUS and TACACS groups and
then map multiple servers to a group. The group to which you map multiple servers is bound to a single VRF.
Conguration Task List for AAA Authentication
The following sections provide the conguration tasks.
• Conguring AAA Authentication Login Methods
• Enabling AAA Authentication
• Enabling AAA Authentication - RADIUS
For a complete list of all commands related to login authentication, refer to the Security chapter in the Dell EMC Networking OS Command
Reference Guide.
Congure Login Authentication for Terminal Lines
You can assign up to ve authentication methods to a method list. Dell EMC Networking OS evaluates the methods in the order in which
you enter them in each list.
If the rst method list does not respond or returns an error, Dell EMC Networking OS applies the next method list until the user either
passes or fails the authentication. If the user fails a method list, Dell EMC Networking OS does not apply the next method list.
Conguring AAA Authentication Login Methods
To congure an authentication method and method list, use the following commands.
Dell EMC Networking OS Behavior: If you use a method list on the console port in which RADIUS or TACACS is the last authentication
method, and the server is not reachable, Dell EMC Networking OS allows access even though the username and password credentials
cannot be veried. Only the console port behaves this way, and does so to ensure that users are not locked out of the system if network-
wide issue prevents access to these servers.
1 Dene an authentication method-list (method-list-name) or specify the default.
CONFIGURATION mode
aaa authentication login {method-list-name | default} method1 [... method4]
The default method-list is applied to all terminal lines.
Possible methods are:
• enable: use the password you dened using the enable secret, enable password, or enable sha256-password
command in CONFIGURATION mode. In general, the enable secret command overrules the enable password command.
If you congure the enable sha256-password command, it overrules both the enable secret and enable password
commands.
• line: use the password you dened using the password command in LINE mode.
• local: use the username/password database dened in the local conguration.
• none: no authentication.
• radius: use the RADIUS servers congured with the radius-server host command.
• tacacs+: use the TACACS+ servers congured with the tacacs-server host command.
2 Enter LINE mode.
CONFIGURATION mode
line {aux 0 | console 0 | vty number [... end-number]}
Security
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