Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 635
TACACS+ Remote Authentication and Authorization, Monitor TACACS
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Figure 35-4. Failed Authentication Force10(conf)# Force10(conf)#do show run aaa ! aaa authentication enable default tacacs+ enable aaa authentication enable LOCAL enable tacacs+ aaa authentication login default tacacs+ local aaa authentication login LOCAL local tacacs+ aaa authorization exec default tacacs+ none aaa authorization commands 1 default tacacs+ none aaa authorization commands 15 default tacacs+ none aaa accounting exec default start-stop tacacs+ aaa accounting commands 1 default start-stop tacacs+ aaa accounting commands 15 default start-stop tacacs+ Force10(conf)# Force10(conf)#do show run tacacs+ ! tacacs-server key 7 d05206c308f4d35b Server key purposely changed to incorrect value tacacs-server host 10.10.10.10 timeout 1 Force10(conf)#tacacs-server key angeline Force10(conf)#%RPM0-P:CP %SEC-5-LOGIN_SUCCESS: Login successful for user admin on vty0 (10.11.9.209) %RPM0-P:CP %SEC-3-AUTHENTICATION_ENABLE_SUCCESS: Enable password authentication success on vty0 ( 10.11.9.209 ) %RPM0-P:CP %SEC-5-LOGOUT: Exec session is terminated for user admin on line vty0 (10.11.9.209) Force10(conf)#username angeline password angeline Force10(conf)#%RPM0-P:CP %SEC-5-LOGIN_SUCCESS: Login successful for user angeline on vty0 (10.11.9.209) %RPM0-P:CP %SEC-3-AUTHENTICATION_ENABLE_SUCCESS: Enable password authentication success on vty0 ( 10.11.9.209 ) User authenticated using secondary method Monitor TACACS+ To view information on TACACS+ transactions, use the following command in the EXEC Privilege mode: Command Syntax debug tacacs+ Command Mode Purpose EXEC Privilege View TACACS+ transactions to troubleshoot problems. TACACS+ Remote Authentication and Authorization FTOS takes the access class from the TACACS+ server. Access class is the class of service that restricts Telnet access and packet sizes. If you have configured remote authorization, then FTOS ignores the access class you have configured for the VTY line. FTOS instead gets this access class information from the TACACS+ server. FTOS needs to know the username and password of the incoming user before it can fetch the access class from the server. A user, therefore, will at least see the login prompt. If the access class denies the connection, FTOS closes the Telnet session immediately. Security | 635
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