Connectivity Guide

Security
Authentication, authorization, and accounting (AAA) services secure networks against unauthorized access. In addition to local
authentication, OS10 supports remote authentication dial-in user service (RADIUS) and terminal access controller access control
system (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 authentication (user credentials verification), authorization (role-based permissions),
and accounting services. You can configure the security protocol used for different login methods and users. RADIUS provides
very limited authorization and accounting services compared to TACACS+.
AAA authentication methods
An OS10 switch 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 configured.
The authentication methods in the method list execute in the order in which you configure them. You can re-enter the methods
to change the order. The local authentication method remains enabled even if you remove all configured methods in the list
using the no aaa authentication login {console | default} command.
● Configure the AAA authentication method in CONFIGURATION mode.
aaa authentication login {console | default} {local | group radius | group tacacs+}
○ console — Configure authentication methods for console logins.
○ default — Configure authentication methods for non-console such as SSH and Telnet logins.
○ local — Use the local username, password, and role entries configured with the username password role
command.
○ group radius — Use the RADIUS servers configured with the radius-server host command.
○ group tacacs+ — Use the TACACS+ servers configured with the tacacs-server host command.
Configure user role on server
If a console user logs in with RADIUS or TACACS+ authentication, the role you configured for the user on the RADIUS or
TACACS+ server applies. User authentication fails if no role is configured on the authentication server.
In addition, you must configure the user role on the RADIUS or TACACS+ server using the vendor-specific attribute (VSA)
or the authentication fails. Dell's vendor ID is 674. You create a VSA with Name = Dell-group-name, OID = 2,
Type = string. Valid values for Dell-group-name are sysadmin, secadmin, netadmin, and netoperator. Use the VSA
Dell-group-name values when you create users on a Radius or TACACS+ server.
For detailed information about how to configure vendor-specific attributes on a RADIUS or TACACS+ server, refer to the
respective RADIUS or TACACS+ server documentation.
Configure AAA authentication
OS10(config)# aaa authentication login default group radius local
OS10(config)# do show running-configuration aaa
aaa authentication login default group radius local
aaa authentication login console local
Remove AAA authentication methods
OS10(config)# no aaa authentication login default
OS10(config)# do show running-configuration aaa
aaa authentication login default local
aaa authentication login console local
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