Questions on Link Local Address and Prefix

[Siva Veerepalli]

Draft 11 of the Addressing Architecture says the following:

a. The prefix length of link-local is 10 bits i.e., FE80::/10 (sec 2.4)
b. For all unicast addresses, except those that start with binary value 000, Interface IDs are required to be 64 bits long and to be constructed in Modified EUI-64 format (sec 2.5.1)

In "2.5.6 Local-Use IPv6 Unicast Addresses", the figure shows that the 54 bits following the first 10 bits of the link local address are set to 0. However, it is not explicitly stated anywhere that this is a requirement. If that is the intent, then shouldn't the LL prefix really be FE80::/64?

If that is not the intent, are the 54 bits following the first 10 considered part of the prefix (subnet ID?), that can be any value (or) is it considered part of the interface ID (but that does not agree with b., above).


Thanks,
Siva

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