CgkGlobalIdentifier
A 16 octet field containing a unique identifier. The identifier contains the following fields: 60 bit nanosecond time (octets 0-6, low 4 bits of octet 7) 4 bit version (hi 4 bits of octet 7) 3 octet 0 (a variant field) 1 octet hi 2bits 0, low 6bits clock sequence. 6 octet MAC Address See Reference for generation of this value.