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In this video, Keith Barker covers link-local addresses and how they're calculated using IPv6's EUI-64 calculation. This video quickly answers what a link local address is, how hexadecimal notation works, IPv6 IP address segmentation, and how a link-local address gets created for every interface running IPv6.

IPv6 creates many opportunities for routing and addressing that were simply impossible with IPv4. One is EUI-64, a pretty simple calculation that starts with a device's 128-bit IP address and ends with a unique local address specific to that device. That link-local address means that the interface has a global address that's reachable from the rest of the internet, but also an address that's reachable only on the local segment. The magic of creating that link-local address is in splitting the 128-bit IP address in half, and doing some hexadecimal magic to it.

Watch and see the math behind what an IOS router is doing when it takes the MAC address (the Layer 2 address) of the interface and converts its 48 bits into a unique 64-bit identifier. And then watch Keith enable an interface and hard code an IP address — last, see the link-local address get created by the IOS router.

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