C
HAPTER
13
| Security Measures
AAA Authorization and Accounting
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◆ IPv4 Source Guard – Filters IPv4 traffic on insecure ports for which the
source address cannot be identified via DHCPv4 snooping nor static
source bindings.
◆ IPv6 Source Guard – Filters IPv6 traffic on insecure ports for which the
source address cannot be identified via ND snooping, DHCPv6
snooping, nor static source bindings.
◆ DHCP Snooping – Filter IP traffic on insecure ports for which the source
address cannot be identified via DHCP snooping.
N
OTE
:
The priority of execution for the filtering commands is Port Security,
Port Authentication, Network Access, Web Authentication, 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.
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