Chapter 25 AAA
GS2220 Series User’s Guide
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track when users log in, log out, execute commands and so on. Accounting can also record system
related actions such as boot up and shut down times of the Switch.
Lo c a l Use r Ac c o unts
By storing user profiles locally on the Switch, your Switch is able to authenticate and authorize users
without interacting with a network AAA server. However, there is a limit on the number of users you may
authenticate in this way.
RADIUS a nd TAC AC S+
RADIUS and TACACS+ are security protocols used to authenticate users by means of an external server
instead of (or in addition to) an internal device user database that is limited to the memory capacity of
the device. In essence, RADIUS and TACACS+ authentication both allow you to validate an unlimited
number of users from a central location.
The following table describes some key differences between RADIUS and TACACS+.
25.2 AAA Sc re e ns
The AAA screens allow you to enable authentication and authorization or both of them on the Switch.
First, configure your authentication server settings (RADIUS, TACACS+ or both) and then set up the
authentication priority, activate authorization.
Click Adva nc e d Applic a tio n > AAA in the navigation panel to display the screen as shown.
Fig ure 191 Advanced Application > AAA
25.3 RADIUS Se rve r Se tup
Use this screen to configure your RADIUS server settings. Click the RADIUS Se rve r Se tup link in the AAA
screen to view the screen as shown.
Table 109 RADIUS vs. TACACS+
RADIUS TACACS+
Transport
Protocol
UDP (User Datagram Protocol) TCP (Transmission Control Protocol)
Encryption Encrypts the password sent for
authentication.
All communication between the client (the Switch)
and the TACACS server is encrypted.
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