![]() ![]() The resulting IPv6 global unicast address has become: Note that the link-local address that we previously manually assigned appears in the output of the IPv6 information of this interface. Take a look at this series of commands and their results. On a Cisco IOS device, as soon as you enable the IPv6 capability on an interface, the device will automatically generate a link-local address using the EUI-64 process by default. Link-local addresses are of the form FE80::/10. Link-local addresses, as the name suggests, have only local significance, so they are never routed. Remember that the link-local IPv6 address is an IPv6 address that is automatically generated and assigned to an active IPv6 interface. The first scenario involves generating a link-local IPv6 address on the interface of a Cisco router. We’ll examine two particular cases that we often see on Cisco IOS devices. Let’s take a look at how EUI-64 actually operates on a real device. ![]() Real-world example of EUI-64 configuration It is used to differentiate individual devices or interfaces within the same network or subnet. The interface identifier created via the EUI-64 process serves as the device-unique portion of the address. ![]()
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