Cisco Systems SG50028PK9NA MAC-Based Authentication

Security: 802.1X Authentication
Authenticator Overview
Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 387
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This is described in the following:
Figure1 802.1x-Based Authentication
MAC-Based Authentication
MAC-based authentication is an alternative to 802.1X authentication that allows
network access to devices (such as printers and IP phones) that do not have the
802.1X supplicant capability. MAC-based authentication uses the MAC address of
the connecting device to grant or deny network access.
In this case, the switch supports EAP MD5 functionality with the username and
password equal to the client MAC address, as shown below.
Figure2 MAC-Based Authentication
The method does not have any specific configuration.