Configuration restrictions and guidelines
When you configure the authentication trigger feature, follow these restrictions and guidelines:
Enable the multicast trigger on a port when the clients attached to the port cannot send EAPOL-Start packets to initiate 802.1X authentication.
Enable the unicast trigger on a port if only a few 802.1X clients are attached to the port and these clients cannot initiate authentication.
To avoid duplicate authentication packets, do not enable both triggers on a port.