American Fibertek SM9p - Manual (Page 171)

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X-ring Interface
[NOTE] 1. When the X-Ring function enabled, the user must disable the RSTP. The
X-Ring function and RSTP function cannot exist on a switch at the same
time.
2. Remember to execute the “Save Configuration” action, otherwise the new
configuration will lose when switch powers off.
Security-802.1x/Radius Configuration
In this section, you can configure 802.1x, IP, and port security.
802.1X Configuration
802.1x is an IEEE authentication specification that allows a client to connect to a wireless
access point or wired switch but prevents the client from gaining access to the Internet
until it provides authority, like a user name and password that are verified by a separate