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Disabling a specific MAC address on a core switch

You can block a specific MAC address on a core switch using port security, MAC lockout, or VLAN access maps depending on your switch model and network setup. Methods to Block a MAC Address1. Port Security (Cisco/Edge-Core/HP switches)Configure the port where the device connects to allow only specific MAC addresses.

Example (Cisco-like syntax):interface GigabitEthernet1/0/1switchport mode accessswitchport port-securityswitchport port-security maximum 1switchport port-security violation shutdownswitchport port-security mac-address This prevents any other MAC addresses from using the port and can drop traffic from the blocked MAC. 2.

MA

C Lockout (HP ProCurve)HP switches support the lockout-mac command to block a MAC address globally.lockout-mac The switch drops all traffic to or from the locked MAC. This is simple but may be bypassed if the device changes its MAC. 3.

MA

C Filtering / VLAN Access Maps (Cisco)Create a MAC access list and apply it to a VLAN to drop traffic from the unwanted MAC:mac access-list extended BLOCK_MACdeny host permit any anyvlan access-map BLOCK_MAP 10match mac address BLOCK_MACaction dropvlan filter BLOCK_MAP vlan-list This method works for dynamically learned MACs and can be applied to multiple VLANs. 4. Centralized Authentication (Optional, Scalable)For larger networks, using 802.

1X with RADIUS or MAB (MAC Authentication Bypass) allows centralized control of allowed MAC addresses. Unknown devices are blocked automatically.

Considerations

Dynamic MA

Cs: Devices with randomized MAC addresses may bypass static blocks. Port vs VLAN: Decide whether to block on a specific port or across a VLAN.

Multiple VLA

Ns: VLAN access maps or centralized authentication are better for multi-VLAN environments. Security Level: Port security is simple but can be circumvented; centralized solutions provide stronger enforcement. By choosing the appropriate method based on your switch model and network design, you can effectively disable or block a specific MAC address on your core switch.

Disabling a specific MAC address on a core switch
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