Concept Guide

Configuring AAA Authentication Login Methods
To configure 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 verified. 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. Define 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 defined 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 configure the enable sha256-password command, it overrules both the enable
secret and enable password commands.
● line: use the password you defined using the password command in LINE mode.
● local: use the username/password database defined in the local configuration.
● none: no authentication.
● radius: use the RADIUS servers configured with the radius-server host command.
● tacacs+: use the TACACS+ servers configured with the tacacs-server host command.
2. Enter LINE mode.
CONFIGURATION mode
line {aux 0 | console 0 | vty number [... end-number]}
3. Assign a method-list-name or the default list to the terminal line.
LINE mode
login authentication {method-list-name | default}
To view the configuration, use the show config command in LINE mode or the show running-config in EXEC Privilege
mode.
NOTE:
Dell EMC Networking recommends using the none method only as a backup. This method does not authenticate
users. The none and enable methods do not work with secure shell (SSH).
You can create multiple method lists and assign them to different terminal lines.
Enabling AAA Authentication
To enable AAA authentication, use the following command.
● Enable AAA authentication.
CONFIGURATION mode
aaa authentication enable {method-list-name | default} method1 [... method4]
○ default: uses the listed authentication methods that follow this argument as the default list of methods when a user
logs in.
○ method-list-name: character string used to name the list of enable authentication methods activated when a user
logs in.
○ method1 [... method4]: any of the following: RADIUS, TACACS, enable, line, none.
If you do not set the default list, only the local enable is checked. This setting has the same effect as issuing an aaa
authentication enable default enable command.
Enabling AAA Authentication — RADIUS
To enable authentication from the RADIUS server, and use TACACS as a backup, use the following commands.
1. Enable RADIUS and set up TACACS as backup.
710
Security