Cisco Systems Servers Manuale Utente

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Cisco Secure ACS 3.0 for Windows 2000/NT Servers User Guide
78-13751-01, Version 3.0
12
Administering External User 
Databases
After you have configured Cisco Secure Access Control Server for 
Windows NT/2000 Servers Version 3.0 (Cisco Secure ACS) to communicate with 
an external user database, you can decide how to implement other 
Cisco Secure ACS features related to external user databases. To address these 
features, this chapter contains the following sections:
For information about the databases supported by Cisco Secure ACS and how to 
configure Cisco Secure ACS to communicate with an external user database, see 
Unknown User Processing
Unknown users are users who are not listed in the Cisco Secure ACS database. 
The Unknown User feature is a form of authentication forwarding. In essence, this 
feature is an extra step in the authentication process. In this additional step of the 
authentication process, if the username does not exist in the Cisco Secure ACS 
database, Cisco Secure ACS forwards the authentication request of an incoming 
username and password to external databases with which it is configured to 
communicate.