MAC to EUI-64 conversion

[xine xine]

Hi !

I'm currently studdying IPv6 addressing for BSCI Certification Exam.

Because this part was too much summarised in BSCI preparation book for my understanding I had buy and read Cisco Self-Study Implementing Cisco IPv6 Networks (IPv6).

I would like understanding MAC to EUI-64 conversion mechanisim. I'm understand the first part of the conversion about inserting FFFE code between the part or the MAC address OUI and the ID part. The second part is not completed clear to me….. In the first octect of the OUI part the second bit indicate if the address is unique or not.

Base on the understanding of what I read, some constructor used Globally manage address like DEC used 08-00-2B-xx-xx-xx. Locally means that you can rewrite the MAC address with your own value as example Sun…..

How can I know when I check MAC address if is an globally or loaccaly managed address ?

Thanks a lot and have a nice day !

[davariganesh1994]

SCENARIO: Router R1 has a MAC address of 0015.2BE4.9B60 on its Fa 0/0 interface. The objective is to calculate the corresponding EUI-64 address based on this MAC address.

Step #1: Split the MAC address in the middle:

0015.2B   E4.9B60

Step #2: Insert FF:FE in the middle:

0015.2BFF.FEE4.9B60

Step #3: Change the format to use a colon delimiter:

0015:2BFF:FEE4:9B60

Step #4: Convert the first eight bits to binary:

00 -> 00000000

Step #5: Flip the 7th bit:

00000000 -> 00000010

Step #6: Convert these first eight bits back into hex:

00000010 -> 02, which yields an EUI-64 address of 0215:2BFF:FEE4:9B60

Thanks to Kevin sir