Ralph Droms wrote:
> ITU-T G.9903
Thanks for bringing this discussion to a technical level. So this
document has allocated the dispatch code ESC (RFC 6282's value of
01_000000) for the specific purposes of G.9903 ("command frames"). We
probably should add a comment to the IANA registry [1] that this code is
not available in G.9903-based networks. (I can't seem to find the
liaison statement that alerted IETF to this allocation; however, another
part of that document mentions that "IANA consideration" is "for further
study", so that might still come.)
The other interesting observation is that G.9903 always seems to use the
mesh header with V=1 and F=1 (i.e., the dispatch region used is
10_11XXXX). This might coincide with the purported plan by the Thread
Group to use the Mesh Header (of which I unfortunately know no details).
I'm not an expert on G.9903 (in particular, I don't understand the
interaction between its Annex E and RFC 6775; the latter only seems to
be reference for the HC area context distribution), but it seems to me
this is exactly a case where pre-configured knowledge of the way the
mesh header is intended to be used, is a prerequisite to being able to
use it ("a 6LoWPAN device requires a set of pre-deployed information,
called a LoWPAN information base(LIB), ..."; similarly, there is an
"Adaptation sublayer IB", IB = information base).
Grüße, Carsten
[1]:
https://www.iana.org/assignments/_6lowpan-parameters/_6lowpan-parameters.xhtml