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Understanding 802.1X Static MAC on EX-series Switches

Enterprise LANS support many different types of devices. Along with 802.1X-enabled devices, such as VoIP telephones and laptops, non-802.1X enabled devices, such as building access control readers, printers, and HVAC systems must have reliable access to the LAN . These non-802.1X-enabled endpoints are known as non-responsive hosts.

To preserve the security of the LAN, you use MAC-based authentication as a bypass mechanism to authenticate non-responsive hosts. MAC-based authentication connects the non-responsive hosts to 802.1X-enabled ports, bypassing 802.1X authentication. The MAC address of the nonresponsive host is configured as a static MAC address in a local database which contains a list of user-configured static MAC addresses. The JUNOS software sends An EAPOL Request/Identity message to the non-responsive host. If the MAC-address returned by the non-responsive host matches the MAC-address in the local database, the software opens a port for the non-responsive host.

The following diagram shows the authentication process for non-responsive hosts.

Figure 1: Process Flowchart for Non-Responsive Host Requests

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