The following table provides a brief description of the authentication methods. When an authentication method is configured to be performed by an authentication server such as Kerberos, LDAP, RADIUS, or TACACS+, the user can get access denial if either the authentication server is down, or it does not authenticate him/her. An authentication fallback mechanism can be defined in case the first authentication level fails. See the following table on authentication methods and fallback mechanisms.This procedure configures an authentication method that applies to logins to devices connected to serial ports. You can select different methods for individual ports or for groups of ports.The changes are stored in /etc/portslave/pslave.conf on ACS.
6. Make sure that an authentication server is specified for the selected authentication type.
NIS, Local/NIS, NIS/Local, or NIS/DownLocal RADIUS, Local/RADIUS, RADIUS/Local, or RADIUS/DownLocal TACACSPlus, Local/TACACSPlus, TACACSPlus/Local, or TACACSPlusDownLocal