big frame support in 802.15.4G

[Michael Richardson <mcr+ietf@sandelman.ca>]

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Can 802.15.4g with 2048 byte frames exist in an LLN along with nodes using
802.15.4-2012 classic 127 byte frames?

There are three questions embedded here:
1) are there radios issues that would prevent this from ever being an issue?

2) assuming that 15.4g radios can communicate with 15.4 radios, is there
   something that would permit one 15.4g radio to realize it was talking
   to another 15.4g radio at the L2 (frame) level?

3) if the answer to #2 is no, then is this akin to ethernet with jumbo
   frames, where the MTU (and fraglettation method) to each destination needs
   to go into the neighbour cache?

RFC4681 section 4.6.4 specifies an MTU value for the network as a whole
        in the RA.  https://tools.ietf.org/html/rfc4861#section-4.6.4

I thought that I'd see an option to put the MTU into the NA as well, but
I don't see that specified, so how can jumbo ethernet work today?
(maybe that's why it isn't on by default more often...)

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-




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