3Com 4200G 12-Port Configuration Manual page 260

You can execute the scheme radius-scheme radius-scheme-name command to adopt an already
configured RADIUS scheme to implement all the three AAA functions. If you adopt the local
scheme, only the authentication and authorization functions are implemented, the accounting
function cannot be implemented.
If you execute the scheme radius-scheme radius-scheme-name local command, the local
scheme is used as the secondary scheme in case no RADIUS server is available. That is, if the
communication between the switch and a RADIUS server is normal, the local scheme is not used;
otherwise, the local scheme is used.
If you execute the scheme hwtacacs-scheme hwtacacs-scheme-name local command, the local
scheme is used as the secondary scheme in case no TACACS server is available. That is, if the
communication between the switch and a TACACS server is normal, the local scheme is not used;
if the TACACS server is not reachable or there is a key error or NAS IP error, the local scheme is
used.
If you execute the scheme local or scheme none command to adopt local or none as the primary
scheme, the local authentication is performed or no authentication is performed. In this case you
cannot specify any RADIUS scheme or HWTACACS scheme at the same time.
If you configure to use none as the primary scheme, FTP users of the domain cannot pass
authentication. Therefore, you cannot specify none as the primary scheme if you want to enable
FTP service.
Configuring separate AAA schemes
You can use the authentication, authorization, and accounting commands to specify a scheme for
each of the three AAA functions (authentication, authorization and accounting) respectively. The
following gives the implementations of this separate way for the services supported by AAA.
1) For terminal users
Authentication: RADIUS, local, HWTACACS or none.
Authorization: none or HWTACACS.
Accounting: RADIUS, HWTACACS or none.
You can use an arbitrary combination of the above implementations for your AAA scheme configuration.
2) For FTP users
Only authentication is supported for FTP users.
Authentication: RADIUS, local, or HWTACACS.
Follow these steps to configure separate AAA schemes:
To do...
Enter system view
Create an ISP domain and
enter its view, or enter the view
of an existing ISP domain
Use the command...
system-view
domain isp-name
2-4
Remarks
—
Required