link-local address calculation
vikassharmas at gmail.com
Thu Apr 7 03:18:33 CDT 2011
How to get link-local address from BIA. I have seen some information
on Internet but it is not working for all.
The BIA in this case is cc00.0bfc.0000. The rules for the modified
EUI-64 addressing are:
•FFFE will be put in between the vendor-id (3 most significant bytes)
and the extension-id (3 least significant bytes), which will lead to
•Thereafter the seventh bit, known as universal/local bit, gets
inverted. So first change the cc00 from hex to binary, which leads to
110011 0 000000000 and then invert the seventh bit (here a 0): 110011
1 000000000. Moved back to hex this will give CE00
•At last, change all points ‘.’ to colons ‘:’ and delete all leading
zeros, then you got your link-local IPv6 address:
So if your BIA is 0008.209a.081b (bia 0008.209a.081b), how link-local
be calculated. This is the link-local on router =>
IPv6 is enabled, link-local address is FE80::208:20FF:FE9A:81B
Also on XR below is the link local address
Loopback6 is Up, ipv6 protocol is Up, Vrfid is default (0x60000000)
IPv6 is enabled, link-local address is fe80::884c:2dff:fe84:8d75
I can not see any interface with BIA ending with 75 ...
Can someone explain me this?
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