James, 4291: For all unicast addresses, except those that start with the binary value 000, Interface IDs are required to be 64 bits long and to be constructed in Modified EUI-64 format. 4291bis: IPv6 unicast routing is based on prefixes of any valid length up to 128 [BCP198]. For example, [RFC6164] standardises 127 bit prefixes on inter-router point-to-point links. However, the Interface ID of all unicast addresses, except those that start with the binary value 000, is required to be 64 bits long. The rationale for the 64 bit boundary in IPv6 addresses can be found in [RFC7421] Proposal: IPv6 unicast routing is based on prefixes of any valid length up to 128 bits [BCP198]. However, as explained in [RFC7421], the Interface ID of unicast addresses is generally required to be 64 bits in length, with exceptions only provided in special cases where expressly recognised in IETF standards track documents. I think that's a good proposal. Perhaps with s/is generally required to be/are/ Best regards, Ole
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