C
HAPTER
13
| Security Measures
AAA Authorization and Accounting
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N
OTE
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The priority of execution for the filtering commands is Port Security,
Port Authentication, Network Access, Access Control Lists, IP Source
Guard, and then DHCP Snooping.
AAA AUTHORIZATION AND ACCOUNTING
The Authentication, authorization, and accounting (AAA) feature provides
the main framework for configuring access control on the switch. The three
security functions can be summarized as follows:
◆ Authentication — Identifies users that request access to the network.
◆ Authorization — Determines if users can access specific services.
◆ Accounting — Provides reports, auditing, and billing for services that
users have accessed on the network.
The AAA functions require the use of configured RADIUS or TACACS+
servers in the network. The security servers can be defined as sequential
groups that are applied as a method for controlling user access to specified
services. For example, when the switch attempts to authenticate a user, a
request is sent to the first server in the defined group, if there is no
response the second server will be tried, and so on. If at any point a pass
or fail is returned, the process stops.
The switch supports the following AAA features:
â—† Accounting for IEEE 802.1X authenticated users that access the
network through the switch.
â—† Accounting for users that access management interfaces on the switch
through the console and Telnet.
â—† Accounting for commands that users enter at specific CLI privilege
levels.
â—† Authorization of users that access management interfaces on the
switch through the console and Telnet.
To configure AAA on the switch, you need to follow this general process:
1. Configure RADIUS and TACACS+ server access parameters. See
"Configuring Local/Remote Logon Authentication" on page 247.
2. Define RADIUS and TACACS+ server groups to support the accounting
and authorization of services.
3. Define a method name for each service to which you want to apply
accounting or authorization and specify the RADIUS or TACACS+ server
groups to use.
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