Administrator Guide

Version Description
8.3.7.0 Introduced on the S4810.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
pre-6.2.1.0 Introduced on the E-Series.
Usage Information
By default, the locally configured username password is used. If you configure aaa authentication login
default, Dell EMC Networking OS uses the methods this command defines for login instead.
Methods configured with the aaa authentication login command are evaluated in the order they are
configured. If users encounter an error with the first method listed, Dell EMC Networking OS applies the next
method configured. If users fail the first method listed, no other methods are applied. The only exception is the
local method. If the user’s name is not listed in the local database, the next method is applied. If the correct user
name/password combination is not entered, the user is not allowed access to the switch.
NOTE: If authentication fails using the primary method, Dell EMC Networking OS employs the
second method (or third method, if necessary) automatically. For example, if the TACACS+ server
is reachable, but the server key is invalid, Dell EMC Networking OS proceeds to the next
authentication method. The TACACS+ is incorrect, but the user is still authenticated by the
secondary method.
After configuring the aaa authentication login command, configure the login authentication
command to enable the authentication scheme on terminal lines.
Connections to the SSH server work with the following login mechanisms: local, radius, and tacacs.
Related
Commands
• login authentication — enables AAA login authentication on the terminal lines.
• password — creates a password.
• radius-server host — specifies a RADIUS server host.
• tacacs-server host — specifies a TACACS+ server host.
aaa reauthenticate enable
Enable re-authentication of user whenever there is a change in the authenticators.
Syntax
aaa reauthenticate enable
To disable the re-authentication option, use the no aaa reauthenticate enable command.
Defaults Disabled
Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC
Networking OS Command Line Reference Guide.
Version Description
9.11(0.0) Introduced this command.
Usage Information
When an operating system enables to change the user authenticators, the users might access resources and
perform tasks that they do not have authorization.
Once re-authentication is enabled, Dell EMC Networking OS prompts the users to re-authenticate whenever
there is a change in authenticators.
The change in authentication happens when:
• Add or remove an authentication server (RADIUS/TACACS+)
• Modify an AAA authentication/authorization list
• Change to role-only (RBAC) mode
Security 1317