Gabriel,
I am sorry for this late reply.
Basically, I agree that current format document is rather tightly scheduled and not well prepared for future enhancements or revisions, in terms of routing, diagnoses, management, etc. Based on the assumption that we are not yet in the stage of pursuing future rechartering items, it might not be the right time to consider all the cases at one time. Also, we should be in rush to finish the current format document ASAP for moving forward into next stage before next IETF meeting.
Regarding the mesh delivery field, Mario Mao's approach should be fine, and other approaches (like option 2,3, and 4) might be OK. However, it seems like we are trying too much to make the format compact while not considering the future expansions.
After all, my opinion is option 1. Let's have one byte for the multicast bit and the reserved fields for future.
having additional one byte for this is not a big deal in terms of packet size and won't add much complexity for handling it.
Examples of utilizing some reserved fields might be follows:
1. Based on the assumption that 6lowpan supports multiple routing protocols such as LOAD, DYMO-low, HiLow, DSR, or whatever, etc., the field might be used for indicating which specific routing protocol should be used for routing this particular packet. It might be argued whether the format document should support multiple protocols at a time. However, those kind of argue should be debated later while considering routing protocols without eliminating future possible necessity.
2. Routing protocols could be optimzed by having some option fields, while it might not be right time to specifically mention them.
I remember that the issue of the mesh underneath or above IP has been raised several times in the WG. I think it might not be right time considering it again right now.
If you have any other opinions, please let me know
--
Ki-Hyung Kim
Associate Professor
Division of Information and Computer Eng., Ajou University, Suwon, Korea 442-749
Tel: +82-31-219-2433, Cel: +82-17-760-2551, Fax: +82-31-219-2433 http://www.6lowpan.org
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