Example of Configuring AAA Accounting to Track EXEC and EXEC Privilege Level Command UseIn the following sample configuration, AAA accounting is set to track all usage of EXEC commands and commands on privilege level 15.Dell(conf)#aaa accounting exec default start-stop tacacs+Dell(conf)#aaa accounting command 15 default start-stop tacacs+Configuring AAA Accounting for Terminal LinesTo enable AAA accounting with a named method list for a specific terminal line (where com15 and execAcct are the method list names),use the following commands.• Configure AAA accounting for terminal lines.CONFIG-LINE-VTY modeaccounting commands 15 com15accounting exec execAcctExample of Enabling AAA Accounting with a Named Method ListDell(config-line-vty)# accounting commands 15 com15Dell(config-line-vty)# accounting exec execAcctMonitoring AAA AccountingDell Networking OS does not support periodic interim accounting because the periodic command can cause heavy congestion whenmany users are logged in to the network.No specific show command exists for TACACS+ accounting.To obtain accounting records displaying information about users currently logged in, use the following command.• Step through all active sessions and print all the accounting records for the actively accounted functions.CONFIGURATION mode or EXEC Privilege modeshow accountingExample of the show accounting Command for AAA AccountingDell#show accountingActive accounted actions on tty2, User admin Priv 1Task ID 1, EXEC Accounting record, 00:00:39 Elapsed, service=shellActive accounted actions on tty3, User admin Priv 1Task ID 2, EXEC Accounting record, 00:00:26 Elapsed, service=shellDell#AAA AuthenticationDell Networking OS supports a distributed client/server system implemented through authentication, authorization, and accounting (AAA)to help secure networks against unauthorized access.In the Dell Networking implementation, the Dell Networking system acts as a RADIUS or TACACS+ client and sends authenticationrequests to a central remote authentication dial-in service (RADIUS) or Terminal access controller access control system plus (TACACS+)server that contains all user authentication and network service access information.Dell Networking uses local usernames/passwords (stored on the Dell Networking system) or AAA for login authentication. With AAA, youcan specify the security protocol or mechanism for different login methods and different users. In Dell Networking OS, AAA uses a list ofauthentication methods, called method lists, to define the types of authentication and the sequence in which they are applied. You candefine a method list or use the default method list. User-defined method lists take precedence over the default method list.756 Security
