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 into ipv6 eui 64