One option is to enable MAB in a monitor mode deployment scenario. To help ensure the integrity of the authenticated session, sessions must be cleared when the authenticated endpoint disconnects from the network. Simple Network Management Protocol (SNMP) MAC address notification traps, syslogs, and network management tools such as CiscoWorks LAN Management Solution (LMS) may also contain MAC address information.

• Use a low-impact deployment scenario that allows time-critical traffic such as DHCP prior to authentication. If the MAC address is valid, the RADIUS server will return a RADIUS Access-Accept message. Note that even though IEEE 802.1X is not enabled on the port, the global authentication, authorization, and accounting (AAA) configuration still uses the dot1x keyword. The inactivity timer for MAB can be statically configured on the switch port, or it can be dynamically assigned using the RADIUS Idle-Timeout attribute (Attribute 28).

MAB is an important part of most IEEE 802.1X deployments. MAB is fully supported in high-security mode. Next step is configuring your network devices for MAB. The switch waits indefinitely for the endpoint to send a packet. For example, in some companies the purchasing department keeps rigorous records of the MAC address of every device that has ever been approved for purchase. This message indicates to the switch that the endpoint should be allowed access to the port. If IEEE 802.1X times out (or is not configured) and MAB fails, the port can be moved to the Guest VLAN, a configurable VLAN for which restricted access can be enforced. This precaution prevents other clients from attempting to use a MAC address as a valid credential.

Any additional MAC addresses seen on the port will cause a security violation.

MAB is compatible with ACLs that are dynamically assigned by the RADIUS server as the result of successful authentication.

When assigning MAC addresses to devices, vendors set the first three octets to a specific value called the organizationally unique identifier (OUI). You will learn about Logical Device profile, and the basic structure of authentication and authorization policies.

The first consideration you should address is whether your RADIUS server can query an external LDAP database. This section describes the timers on the switch that are relevant to the MAB authentication process in an IEEE 802.1X-enabled environment. After you have discovered and classified the allowed MAC addresses for you network, you must store them in a database that can be accessed by the RADIUS server during the MAB attempt. The advantage of this approach over the local Guest VLAN and AuthFail VLAN is that the RADIUS server is aware of and in control of unknown endpoints.



In addition, if the endpoint has been authorized by a fallback method, then that endpoint may temporarily be adjacent to guest devices that have been similarly authorized.
MAB is compatible with the Guest VLAN feature (Figure 8). A sample MAB RADIUS Access-Request packet is shown in the sniffer trace in Figure 3.

If IEEE 802.1X is enabled in addition to MAB, the switch sends an EAP Request-Identity frame upon link up.

• Inactivity timer with IP device tracking (physical or virtual hub and third-party phones) During the MAC address learning stage, the switch begins MAB by opening the port to accept a single packet from which it will learn the source MAC address of the endpoint.

With the appropriate design and well-chosen components, you can meet the needs of your security policy while reducing the impact on your infrastructure and end users.

For more information about these deployment scenarios, see Section 4. Modify timers, use low-impact mode, or perform MAB before IEEE 802.1X authentication to enable MAB endpoints to get time-critical network access when MAB is used as a fallback to IEEE 802.1X. Because external databases are dedicated servers, they can scale to greater numbers of MAC addresses than can internal databases. Because MAB uses the MAC address as a username and password, you should make sure that the RADIUS server can differentiate MAB requests from other types of requests for network access. Cisco IP Phones can send a Cisco Discovery Protocol message to the switch indicating that the link state for the data endpoint's port is down, allowing the switch to immediately clear the data endpoint's authenticated session. Either, both, or none of the endpoints can be authenticated with MAB. This approach allows the hibernating endpoint to receive the WoL packet while still preventing the unauthorized endpoint from sending any traffic to the network. MAB is compatible with VLANs that are dynamically assigned by the RADIUS server as the result of successful authentication. By default, the port drops all traffic prior to successful MAB (or IEEE 802.1X) authentication. Identify the session termination method for indirectly connected endpoints: This section includes a sample configuration for standalone MAB.

See Section 2.4.1.1.1 for more information about relevant timers. Although IEEE 802.1X-capable endpoints can restart IEEE 802.1X after a fallback has occurred, you may still be generating unnecessary control-plane traffic.
In single-host mode, only a single MAC or IP address can be authenticated (by any method) on a port. Optionally, the RADIUS server may include dynamic network access policy instructions (for example, a dynamic VLAN or access control list [ACL]) in the Access-Accept message. Figure 1 illustrates the default behavior of a MAB-enabled port.

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