To see the work and the answers, highlight the area under the question by clicking and dragging your mouse over it. The following examples have answers in white beneath them. The video (above) walks you step-by-step through this process, and also shows you how the calculated EUI-64 address can be used to calculate a router interface’s Link Local address (an IPv6 address used for communication only on the local network segment).Try a few examples to get better at converting. And we simply concatenate everything with colons. Lines two through six SUBSTITUTE the nth '.' with '' and then FIND that character, returning the next 3 characters.

Step #6: Convert these first eight bits back into hex:Ġ0000010 -> 02, which yields an EUI-64 address of 0215:2BFF:FEE4:9B60 Given 1.9.1.1.1.1, MID returns 1.9, which DEC2HEX truncates to 1. Step #4: Convert the first eight bits to binary: Step #3: Change the format to use a colon delimiter: Step #1: Split the MAC address in the middle: The objective is to calculate the corresponding EUI-64 address based on this MAC address. SCENARIO: Router R1 has a MAC address of 0015.2BE4.9B60 on its Fa 0/0 interface. The following steps walk you through a sample EUI-64 calculation: This command tells the interface to use 2000:1:: as the network portion of the IPv6 address and to automatically calculate the 64-bit host portion of the IPv6 address.ĮUI-64 uses an interface’s MAC address as the basis of it’s calculation, even though we need a 64-bit host address, and a MAC address is only 48 bits in length. You could (in interface configuration mode of your Cisco IOS router) enter the command: For example, let’s say you have a router interface on the IPv6 network of 2000:1::/64.

While you could manually configure the host bits for a router interface, a more efficient approach might be to automatically calculate those host bits using a 64-bit Extended Unique Identifier, known as EUI-64.

A common approach is to use 64 bits to represent the network segment and 64 bits to represent the host on that network segment. An IPv6 address is 128 bits in length, and like an IPv4 address, it’s divided into prefix bits (representing the network segment) and host bits (uniquely identifying a host on that network segment).

Convert mac address to hexadecimal