Special devices such as routers and switches have a In this case, theĮach Ethernet interface on a Cisco router has its ownĮthernet MAC address.

Hardware address line with the BIA (burned in address). On the second line of each interface, you’ll see the Here’s an example: RouterB# show interfaces On a Cisco router, you can find out which MAC addresses yourĬommand. Here’s an example: Switch# show mac-address-table You can find out similar information from the switch In the command’s output, you can find the MAC address under In Windows, you can find out your MAC address using the ipconfig /all command. Whatever you call it, thisĪddress is a 12-character hexadecimal string.

NICs, wireless devices, routers, and switches) preprograms these addresses intoĪ MAC address can go by other names, including physical address (in Windows), Ethernet address, and hardware address. Each vendor that creates network devices (e.g., Ethernet What you might not know is what you can do with MAC addresses in the Cisco IOS.Īn Ethernet MAC address uniquely identifies every Ethernetĭevice in the world. While you're probably familiar with Ethernet MAC addresses, how much do you know about working with them in the Cisco IOS? In this edition of Cisco Routers and Switches, David Davis tells you how to determine the MAC address, change it, and use it to filter traffic.Ĭhances are good that most of you know what an Ethernet MAC address is. Cisco administration 101: Understanding Ethernet MAC addresses

What is my router mac address