This example shows how to block all traffic to or from MAC address 0050.3e8d.6400 in VLAN 12: Router# configure terminal Router(config)# mac address-table static 0050.3e8d. Router(config)# mac address-table static mac_address vlan vlan_ID dropīlocks all traffic to or from the configured MAC address in the specified VLAN. To block all traffic to or from a MAC address in a specified VLAN, perform this task: Cisco IOS Release 12.2SY does not support any WAN features or commands.
Unidirectional Ethernet (UDE) and unidirectional link routing (UDLR).Interface configuration mode or in VLAN configuration mode. MAC Address filtering applies to both wired and wireless clients. In 'Whitelist' mode, the router will restrict network access to all computers except those contained in the 'MAC Filter List' panel.
#Cisco switch blacklist mac address series
Use the show mac address-table multicast CLI command to check the Layer 2 entries.Ĭisco Nexus 3232C, Cisco Nexus 3264Q, and Cisco Nexus 3164Q Series switch support disabling and re-enabling MAC address learningĬonfiguring MAC Addresses Configuring Static The MAC Filter allows you to block specific computers from using the network when operating in the 'Blacklist' mode. Or shift-click to select many checkboxes at once. Want to block all Apple devices Try searching for mfr:apple, then Select: All and Block. Go to the usage page, select some checkboxes, and select Actions > Whitelist (or Block, or Normal). The show mac address-table CLI command does not display the multicast MAC entries. Meraki network admins can now block or whitelist many client devices in one easy step. Therefore, the proper age of the mac-address cannot be determined. The aging of the mac-address is not incrementing in the output of the show mac address-table CLI command. See the following guidelines and limitations for configuring the MAC address tables: Guidelines for Configuring the MAC Address Tables These static MAC entries are retained across a reboot You can also enter a MAC address, which is termed a static MACĪddress, into the table. The switch then forwards subsequentįrames to a single LAN port without flooding all LAN ports. We have 802.1X for this type of thing, but you will need to build the infrastructure for that. It is so very simple to change the MAC address of a device to be an allowed MAC address that you are only fooling yourself if you think it adds any level of security. The destination station replies, the switch adds its relevant MAC sourceĪddress and port ID to the address table. Security by MAC address is a fool's game. MAC destination address not listed in its address table, it floods the frame toĪll LAN ports of the same VLAN except the port that received the frame. The switch dynamically builds the address table by using the MAC When the switch receives a frame, it associates the mediaĪccess control (MAC) address of the sending network device with the LAN port on To switch frames between LAN ports, the switch maintainsĪn address table. Verifying the MAC Address Configuration.
Guidelines for Configuring the MAC Address Tables.