Users Guide

Accessing the I/O Aggregator Using the CMC
Console Only
This functionality is supported on the Aggregator.
You can enable the option to access and administer an Aggregator only using the chassis management controller (CMC) interface, and
prevent the usage of the CLI interface of the device to configure and monitor settings. You can configure the restrict-access session
command to disable access of the Aggregator using a Telnet or SSH session; the device is accessible only using the CMC GUI. You can
use the no version of this command to reactivate the Telnet or SSH session capability for the device. Use the show restrict-access
command to view whether the access to a device using Telnet or SSH is disabled or not.
AAA Authentication
Dell Networking OS supports a distributed client/server system implemented through authentication, authorization, and accounting (AAA)
to help secure networks against unauthorized access.
In the Dell Networking implementation, the Dell Networking system acts as a RADIUS or TACACS+ client and sends authentication
requests to a central remote authentication dial-in service (RADIUS) or Terminal access controller access control system plus (TACACS+)
server that contains all user authentication and network service access information.
Dell Networking uses local usernames/passwords (stored on the Dell Networking system) or AAA for login authentication. With AAA, you
can specify the security protocol or mechanism for different login methods and different users. In Dell Networking OS, AAA uses a list of
authentication methods, called method lists, to define the types of authentication and the sequence in which they are applied. You can
define a method list or use the default method list. User-defined method lists take precedence over the default method list.
NOTE
: If a console user logs in with RADIUS authentication, the privilege level is applied from the RADIUS server if the privilege
level is configured for that user in RADIUS, whether you configure RADIUS authorization.
Configuration Task List for AAA Authentication
The following sections provide the configuration tasks.
• Configure Login Authentication for Terminal Lines
• Configuring 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 Networking OS Command
Reference Guide.
Configure Login Authentication for Terminal Lines
You can assign up to five authentication methods to a method list. Dell Networking OS evaluates the methods in the order in which you
enter them in each list.
If the first method list does not respond or returns an error, Dell Networking OS applies the next method list until the user either passes or
fails the authentication. If the user fails a method list, Dell Networking OS does not apply the next method list.
Configuring AAA Authentication Login Methods
To configure an authentication method and method list, use the following commands.
Dell 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 Networking OS allows access even though the username and password credentials cannot be verified.
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Security