Administrator Guide

Configuration Task List for AAA Accounting
The following sections present the AAA accounting configuration tasks.
• Enabling AAA Accounting (mandatory)
• Suppressing AAA Accounting for Null Username Sessions (optional)
• Configuring Accounting of EXEC and Privilege-Level Command Usage (optional)
• Configuring AAA Accounting for Terminal Lines (optional)
• Monitoring AAA Accounting (optional)
Enabling AAA Accounting
The aaa accounting command allows you to create a record for any or all of the accounting functions monitored.
To enable AAA accounting, use the following command.
• Enable AAA accounting and create a record for monitoring the accounting function.
CONFIGURATION mode
aaa accounting {dot+x | system | exec | command level} {default | name} {start-stop | wait-
start | stop-only} {tacacs+}
The variables are:
• system: sends accounting information of any other AAA configuration.
• dot1x: Enter the keyword dot1x for dot1x events.
• exec: sends accounting information when a user has logged in to EXEC mode.
• command level: sends accounting of commands executed at the specified privilege level.
• default | name: enter the name of a list of accounting methods.
• start-stop: use for more accounting information, to send a start-accounting notice at the beginning of the requested event
and a stop-accounting notice at the end.
• wait-start: ensures that the TACACS+ security server acknowledges the start notice before granting the user's process
request.
• stop-only: use for minimal accounting; instructs the TACACS+ server to send a stop record accounting notice at the end of the
requested user process.
• tacacs+: designate the security service. The system supports only TACACS+.
Example
Dell(conf)#aaa accounting dot1x default start-stop tacacs+
Dell(conf)# tacacs-server host server-address key key
Suppressing AAA Accounting for Null Username Sessions
When you activate AAA accounting, the system issues accounting records for all users on the system, including users whose username
string, because of protocol translation, is NULL.
An example of this is a user who comes in on a line where the AAA authentication login method-list none command is applied. To
prevent accounting records from being generated for sessions that do not have usernames associated with them, use the following
command.
• Prevent accounting records from being generated for users whose username string is NULL.
CONFIGURATION mode
aaa accounting suppress null-username
Configuring Accounting of EXEC and Privilege-Level Command Usage
The network access server monitors the accounting functions defined in the TACACS+ attribute/value (AV) pairs.
• Configure AAA accounting to monitor accounting functions defined in TACACS+.
CONFIGURATION mode
aaa accounting system default start-stop tacacs+
aaa accounting command 15 default start-stop tacacs+
System accounting can use only the default method list.
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Security