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– 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+.
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.
Example of Configuring AAA Accounting to Track EXEC and EXEC Privilege Level Command Use
In 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 Lines
To 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 mode
accounting commands 15 com15
accounting exec execAcct
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