# Can ELI/AAI/SAI addresses be Multicast?

In a slideshow by IEEE regarding the Structured Local Address Plan (SLAP), I saw the following table:

SLAP local identifier SLAP Quadrant Z bit Y bit X bit M bit second hex digit
ELI 01 1 0 1 0 A
SAI 11 1 1 1 0 E
AAI 00 0 0 1 0 2
Reserved 10 0 1 1 0 6

This table shows that the M bit is zero; therefore the second hex digits are A, E, 2, 6. For example "1A-23-45-67-89-00" is an ELI.

I know that an ELI is a concatenation between a CID and a vendor-specific part. And IEEE states that in a CID, the M, X, Y, and Z bits have the values 0, 1, 0, and 1, respectively. So, this matches with the table.

However, in the standard IEEE 802c-Amd2, I saw the following table (The standard is not publicly available for free, but a screenshot of the table can be seen here):

Local MAC address type M bit X bit Y bit Z bit
ELI-48 I/G 1 0 1
ELI-64 I/G 1 0 1
SAI-48 I/G 1 1 1
SAI-64 I/G 1 1 1
AAI-48 I/G 1 0 0
AAI-64 I/G 1 0 0

This table shows that the M-bit is "I/G", so I interpret this notation that an ELI is an ELI based solely on its XYZ bits, independent of the M bit which can be 0 (I) or 1 (G).

My question is : What is "1B-23-45-67-89-00" ?

• Is it a "Multicast ELI"? This would be weird because an ELI is based on a CID, and a CID is defined to have M-bit set to 0.

• Is it a "Multicast EUI"? This would be weird because an EUI is based on a OUI, and a OUI is defined to have X bit set to 0.

• Or is it neither an EUI or ELI, but something else?

The same question goes to:

• "1F-23-45-67-89-00" ("Multicast SAI" or "Multicast EUI" or something else?)

• "13-23-45-67-89-00" ("Multicast AAI" or "Multicast EUI" or something else?)