Re: [Tm-rid] RAA/HDA - drawing the line in 32 bits

[Michael Richardson <[e-mail]>]

Tero Kivinen <[e-mail]> wrote:
    >> In draft-moskowitz-hip-hierarchical-hit-01.txt, I use 14 bits (16,384)
    >> for the RAA space and 18 bits (262,144) for HDA within each RAA.  Seems
    >> reasonable enough for me.  Good as any guess about the future.
    >>
    >> Tero Kivinen suggested a soft separation with the HDA in little endian
    >> order.  This way we might have time to figure out where we need more,
    >> RAAs or HDAs.
    >>
    >> Sounds interesting, but I see potential problem(s) if one RAA really
    >> runs up its number of HDAs and thus limits the number of RAAs in total
    >> as a result.

    > I think we should be strict hard limit for RAAs for how many HDAs it
    > can before it needs to come back for asking changing. For example say
    > 12-bits for HDAs and if it looks like there are going to be multiple
    > RAAs running out of 12-bit space, then we can expand it to 16-bit etc.

Given that we don't have to bake this split into end-user software (which was
the problem with IPv4 before CIDR), then I am in favour of this split.
(Clearly the allocation agency needs to know the split)

--
Michael Richardson <[e-mail]>, Sandelman Software Works
 -= IPv6 IoT consulting =-