Reference Guide

AAA accounting enables tracking of services that users are accessing and the amount of network resources being consumed by
those services. When you enable AAA accounting, the network server reports user activity to the security server in the form of
accounting records. Each accounting record comprises accounting attribute/value (AV) pairs and is stored on the access control
server.
As with authentication and authorization, you must congure AAA accounting by dening a named list of accounting methods and
then applying that list to various virtual terminal line (VTY) lines.
Conguration Task List for AAA Accounting
The following sections present the AAA accounting conguration tasks.
• Enabling AAA Accounting (mandatory)
• Suppressing AAA Accounting for Null Username Sessions (optional)
• Conguring Accounting of EXEC and Privilege-Level Command Usage (optional)
• Conguring 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 {commands | exec | suppress | system level} {default | name} {start-stop |
wait-start | stop-only} {tacacs+}
The variables are:
– system: sends accounting information of any other AAA conguration.
– 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.
– suppress: Do not generate accounting records for a specic type of user.
– 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. Currently, Dell Networking OS supports only TACACS+.
Suppressing AAA Accounting for Null Username Sessions
When you activate AAA accounting, the Dell Networking OS software issues accounting records for all users on the system,
including users whose username string is NULL because of protocol translation.
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
Security
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