• Private VLAN—You can assign a client to a private VLAN.
• Network Edge Access Topology (NEAT)—MAB and NEAT are mutually exclusive. You cannot enable
MAB when NEAT is enabled on an interface, and you cannot enable NEAT when MAB is enabled on
an interface.
Cisco IOS Release 12.2(55)SE and later supports filtering of verbose MAB system messages
Network Admission Control Layer 2 IEEE 802.1x Validation
The switch supports the Network Admission Control (NAC) Layer 2 IEEE 802.1x validation, which checks
the antivirus condition or posture of endpoint systems or clients before granting the devices network access.
With NAC Layer 2 IEEE 802.1x validation, you can do these tasks:
•
Download the Session-Timeout RADIUS attribute (Attribute[27]) and the Termination-Action RADIUS
attribute (Attribute[29]) from the authentication server.
•
Set the number of seconds between re-authentication attempts as the value of the Session-Timeout
RADIUS attribute (Attribute[27]) and get an access policy against the client from the RADIUS server.
•
Set the action to be taken when the switch tries to re-authenticate the client by using the
Termination-Action RADIUS attribute (Attribute[29]). If the value is the DEFAULT or is not set, the
session ends. If the value is RADIUS-Request, the re-authentication process starts.
•
Set the list of VLAN number or name or VLAN group name as the value of the Tunnel Group Private
ID (Attribute[81]) and the preference for the VLAN number or name or VLAN group name as the value
of the Tunnel Preference (Attribute[83]). If you do not configure the Tunnel Preference, the first Tunnel
Group Private ID (Attribute[81]) attribute is picked up from the list.
•
View the NAC posture token, which shows the posture of the client, by using the show authentication
privileged EXEC command.
•
Configure secondary private VLANs as guest VLANs.
Configuring NAC Layer 2 IEEE 802.1x validation is similar to configuring IEEE 802.1x port-based
authentication except that you must configure a posture token on the RADIUS server.
Flexible Authentication Ordering
You can use flexible authentication ordering to configure the order of methods that a port uses to authenticate
a new host. The IEEE 802.1X Flexible Authentication feature supports three authentication methods:
• dot1X—IEEE 802.1X authentication is a Layer 2 authentication method.
• mab—MAC-Authentication Bypass is a Layer 2 authentication method.
• webauth—Web authentication is a Layer 3 authentication method.
Using this feature, you can control which ports use which authentication methods, and you can control the
failover sequencing of methods on those ports. For example, MAC authentication bypass and 802.1x can be
the primary or secondary authentication methods, and web authentication can be the fallback method if either
or both of those authentication attempts fail.
The IEEE 802.1X Flexible Authentication feature supports the following host modes:
Catalyst 2960-X Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX
OL-29048-01 291
Configuring IEEE 802.1x Port-Based Authentication
Network Admission Control Layer 2 IEEE 802.1x Validation
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