Re: [Roll] FW: Revised Early Allocation for draft-ietf-roll-trickle-mcast

The general problem with early allocation is that the entry is placed in the
IANA registry and from that point onwards folk can rightfully interpret the
codepoint as having the meaning documented in the registry. Therefore, there
might reasonably be implementations (code or 'just' diagnostic tools like
sniffers) that have shipped and that use the old code point.

The way that IANA handle this is that they deprecate and do not claim back until
the registry is crowded, allowing as long as possible before re-use.

As it happens, with this registry, there is a preference for allocations based
only on the "rest" bits even though the entries are tracked separately on the
full 8 bits. Thus, in this case, the new and old codepoints are effectively the
same.

For more details on early allocations read RFC 4020 and
https://datatracker.ietf.org/doc/draft-cotton-rfc4020bis/

Cheers,
Adrian

> -----Original Message-----
> From: Ulrich Herberg [mailto:ulrich@herberg.name]
> Sent: 24 May 2013 21:31
> To: adrian@olddog.co.uk; roll WG
> Subject: Re: [Roll] FW: Revised Early Allocation for
draft-ietf-roll-trickle-mcast
> 
> Adrian,
> 
> does "deprecated" mean that this code point is not useable again for
> other protocols? Why can't it be "Unassigned" again (since the draft
> is not yet published as RFC)?
> 
> 
> Thanks
> Ulrich
> 
> On Fri, May 24, 2013 at 1:23 PM, Adrian Farrel <adrian@olddog.co.uk> wrote:
> > FYI
> >
> >> -----Original Message-----
> >> From: iesg-bounces@ietf.org [mailto:iesg-bounces@ietf.org] On Behalf Of
> IESG
> >> Secretary
> >> Sent: 24 May 2013 21:05
> >> To: iana@iana.org
> >> Cc: iesg@ietf.org
> >> Subject: Revised Early Allocation for draft-ietf-roll-trickle-mcast
> >>
> >> IANA is requested to revise the early allocation previously made for
draft-ietf-
> >> roll-roll-trickle-mcast.
> >>
> >> In the "Internet Protocol Version 6 (IPv6) Parameters" registry
> >> (http://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xml)
> >> in the "Destination Options and Hop-by-Hop Options" sub-registry...
> >>
> >> Please revise the entry that reads
> >> 0x4D 01 0 01101 Trickle Multicast Option [draft-ietf-roll-trickle-mcast]
> >> to read
> >> 0x4D 01 0 01101 Deprecated
> >>
> >> Please create a new early allocation entry that reads
> >> 0x6D 01 1 01101 MPL Option [draft-ietf-roll-trickle-mcast]
> >
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