Blocking the MAC address in the Cisco router is nothing but denying access to a device for using the network. You can block MAC address in Cisco routers using the Access Control List (ACL). Using the MAC-based ACL, you can block or allow any MAC addresses. To do this, you have to configure the ACL first. If you fail to configure the ACL on your network devices, then all the packets that pass through the router can access all parts of your network. If you wish to block a MAC address in the VLAN, use the command mentioned below.
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