MAC address confusion

Whic one of these, is locally assigned unicast MAC address, when talking about output format CSCO uses? 4000.0000.0000 (Local IXPs choice) 0200.0000.0000 (My money is here) http://standards.ieee.org/regauth/oui/oui.txt 02-07-01 (hex) RACAL-DATACOM A0-6A-00 (hex) Verilink Corporation In either case two of the lowest or highest bits of 1st octet seems to be happily used to assign addresses. What am I missing here? -- ++ytti