I need help in understanding how Unicast and Multicast MAC address is differentiated as explained in wiki. According to what I understood, when the least significant bit is set as 0 in the first octet of the mac address, then it is a Unicast address and if the least significant bit is set as 1, then the address is Multicast or Broadcast.
Since the first Octet is a part of OUI (Organizationally unique identifier ) which uniquely identifies a vendor/organization and assigned by IEEE, how can the least significant bit be changed in order to differentiate a unicast or multicast address
Let us consider the following two OUI's:
00-27-C7 -> Organization A
- Has 0 set in the least significant byte - 00 -> 0000 0000
A9-5E-4C -> Organization B
- Has 1 set in the least significant byte - A9 -> 1010 1001
-> Does this mean that organization B can not have any unicast MAC address?
-> Is my understanding correct?