In what situation can multicast-triggered authentication be enabled

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If port-based 802.1x authentication is configured on a port, the function of triggering authentication by multicast packets is automatically enabled. This function is used for the clients that cannot send EAPOL-Start packets initiatively. If a guest VLAN is configured and the configuration takes effect, the port is added to the guest VLAN after the attempts to trigger authentication by multicast packets fail six times. Then multicast-triggered authentication is disabled temporarily.

In port-based 802.1x authentication mode, multicast-triggered authentication is enabled again when the user on the port goes offline.

If the port has been Down for more than 10 seconds, multicast-triggered authentication is enabled again when the port becomes Up.

Other related questions:
In what situation does an S series switch considers that Layer 3 multicast is enabled in a VLAN
An S series switch considers that Layer 3 multicast is enabled in a VLAN when the corresponding VLANIF interface is Up at the physical layer and link layer, and one of the following conditions are met: - Protocol Independent Multicast (PIM) is enabled on the VLANIF interface. The Internet Group Management Protocol (IGMP) is enabled on the VLANIF interface. An IGMP static multicast group is configured on the VLANIF interface.

In which situation can ARP entries be learned after strict ARP learning is enabled
If strict ARP learning is enabled, a device does not learn ARP entries matching source IP addresses after receiving ARP request packets. The device updates an ARP entry matching the source IP address in a packet only when the device receives an ARP reply packet, the destination IP address of the ARP reply packet is the device address, and there is an ARP entry, temporary ARP entry, or actual ARP entry matching the source IP address. The device must send an ARP request packet to the source end. After receiving an ARP reply packet, the device learns the ARP entry matching the source end.

Is multicast enabled on the AR router by default
By default, the multicast function of the AR router is disabled.

Checking the storm control configuration on an S series switch
For S series switches, you can run the display storm-control [ interface ] command in any view to check information about storm control on an interface.

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