Source Address (6 bytes) (Token-Ring)

Protocol: Token-Ring MAC Token-Ring PCI

Field: source address

Length: 6 bytes

Contents: source MAC address.

Token-Ring may use their burned-in MAC address containing the manufacturer ID:

IEEE MAC Address

Mostly, the burned-in address is replaced by logical addresses indicated by a value of 0x4000 within the first two bytes. IBM recommends certain guidelines:

Token-Ring Addresses (IBM Guidelines)

Using logical addresses, the Token-Ring frame has the following structure:

a

RII = Routing Information [Field] Indicator

0 = Source Routing NO

1 = Source Routing YES

U/L = Universally or Locally Administered Address

0 = Universally (assigned by IEEE)

1 = Locally (user defined)