This bit identifies whether this interface identifier is universally or locally administered. Next, the seventh bit from the left, or the universal/local (U/L) bit, needs to be inverted. Here is an example showing how a the MAC Address is used to generate EUI. IEEE has chosen FFFE as a reserved value which can only appear in EUI-64 generated from the an EUI-48 MAC address. The 16-bit 0xFFFE is then inserted between these two 24-bits for the 64-bit EUI address. The MAC address is first separated into two 24-bits, with one being OUI (Organizationally Unique Identifier) and the other being NIC specific. The IPv6 EUI-64 format address is obtained through the 48-bit MAC address. This feature is a key benefit over IPv4 as it eliminates the need of manual configuration or DHCP as in the world of IPv4. Extended Unique Identifier (EUI), as per RFC2373, allows a host to assign iteslf a unique 64-Bit IP Version 6 interface identifier (EUI-64).
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