Concept Guide

– exec: sends accounting information when a user has logged in to EXEC mode.
– command level: sends accounting of commands executed at the specied 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
Conguring Accounting of EXEC and Privilege-Level Command Usage
The network access server monitors the accounting functions dened in the TACACS+ attribute/value (AV) pairs.
• Congure AAA accounting to monitor accounting functions dened 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 Conguring AAA Accounting to Track EXEC and EXEC Privilege Level Command Use
In the following sample conguration, 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+
Conguring AAA Accounting for Terminal Lines
To enable AAA accounting with a named method list for a specic terminal line (where com15 and execAcct are the method list names),
use the following commands.
• Congure AAA accounting for terminal lines.
CONFIG-LINE-VTY mode
Security
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