Re: draft-ietf-ipv6-unicast-aggr-v2-02.txt

[Bob Hinden <hinden@iprg.nokia.com>]

Randy,

> >     where the global routing prefix is a (typically hierarchically-
> >     structured) value assigned to a site (a cluster of subnets/links),
> >     the subnet ID is an identifier of a subnet within the site, and the
> >     interface ID is as defined in section 2.5.1 of [ARCH].  The global
> >     routing prefix is designed to be hierarchically structured by
> >     the RIRs and ISPs, and the subnet field is designed to be 
> hierarchically
> >     structured by site administrators.
> >
> > OK?
>
> reviewer sez the appended.  i.e., the interface-id is contentious with
> operators and is document elsewhere anyway.  so why are we picking a fight
> by repeating it here?
I don't think the mention of interface id should be contentious for people 
as it is a basic part of IPv6 global unicast addresses and is implemented 
widely.

> randy
>
> ---
>
> That's excellent by me, assuming that the implied context was to remove
> the text below from the spec.  Otherwise, I'm not sure what was intended;
> just fix a paragraph in page 3?
Yes, the intent was to just fix the paragraph and to not remove the rest of 
the text.  That text is there as a result of the discussion on the working 
group mailing list and summarizes current practice.

Bob


>    [ARCH] also requires that all unicast addresses, except those that
>    start with binary value 000, have Interface IDs that are 64 bits long
>    and to be constructed in Modified EUI-64 format.  The format of
>    global unicast address in this case is:
>
>       |         n bits          | 64-n bits |       64 bits              |
>       +-------------------------+-----------+----------------------------+
>       | global routing prefix   | subnet ID |       interface ID         |
>       +-------------------------+-----------+----------------------------+
>
>    where the routing prefix is a value assigned to identify a site (a
>    cluster of subnets/links), the subnet ID is an identifier of a subnet
>    within the site, and the interface ID is in modified EUI-64 format as
>    defined in [ARCH].
>
>    An example of the resulting format of global unicast address under
>    the 2000::/3 prefix that is currently being delegated by the IANA and
>    consistent with the recommendations in RFC3177 is:
>
>       | 3 |     45 bits         |  16 bits  |       64 bits              |
>       +---+---------------------+-----------+----------------------------+
>       |001|global routing prefix| subnet ID |       interface ID         |
>       +---+---------------------+-----------+----------------------------+