Collisions.pdf

The IEEE-defined 48-bit Extended Unique Identifier-48 (EUI-48) is an identifier used to address hardware interfaces within existing IEEE 802 or IEEE 802-like networking applications. It is formed by concatenating a 24-bit Organizationally Unique Identifier (OUI) value assigned by the IEEE Registration Authority (IEEE RA) and a 24-bit extension identifier assigned by the organization. The EUI-48 is a string of six octets and is properly displayed with hyphens between numbers in canonical address representation. The IEEE RA assigns the base 24-bit, 28-bit, or 36-bit number, and the organization assigns the extension identifier. The use of EUI-48 identifiers is restricted to low-volume applications, and the IEEE-RAC reviews new applications to ensure proper usage. The EUI-48 format consists of a concatenation of the OUI and extension identifier, and it is not to be confused with the non-canonical address representation, which is deprecated. The all-zeros and all-ones EUI-48 values are owned by the IEEE Registration Authority and will never be assigned. Mapping an EUI-48 to an EUI-64 is also deprecated and should not be used in new applications.