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We'd like only allow a computer with a specific MAC address to connect some ports on MX68, Can anyone tell how to do it?
Thanks
You can't, you can restrict only in MS.
You can configure an Access Policy on a MX port in Access mode to use MAC Authentication Bypass, but it will require a RADIUS server.
Other than that, there is no way to restrict MAC addresses on an MX switch port.
Create a firewall rule that does a "deny any any". Then apply the "Allow" group policy to the one specific client you want to allow access.
https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Blocking_and_Allowing...