The dot1x mc-trigger command enables multicast-triggered 802.1X authentication.
The undo dot1x mc-trigger command disables multicast-triggered 802.1X authentication.
By default, multicast-triggered 802.1X authentication is enabled.
If a client (for example, the built-in 802.1X client of the Windows operating system) cannot send an EAPOL-Start packet to perform 802.1X authentication, you can enable multicast-triggered 802.1X authentication. After that, the device multicasts an EAP-Request/Identity packet to the client to trigger authentication.