Basically the options you have are these,but its more like telling who is allowed: https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Switch_Ports#Port_configuration MAC allow list: Only devices with MAC addresses specified in this list will have access to this port. Up to 20 MAC addresses can be defined. Sticky MAC allow list: The switch will dynamically learn the MAC addresses of devices connected to the port and place the address in the MAC Whitelist. The administrator can define the size of this list. When this list is full, all subsequent devices will be denied access to this port. It can take up to 5 minutes for the learned MAC to appear in dashboard. User-defined access policy: Administrators may define a policy for authentication via 802.1x or MAB. Learn more about access policies here.
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