[Roll] mixture of storing and non-storing nodes

[Omprakash Gnawali <[e-mail]>]

Dear ROLL WG,

John Ko posted a draft a few days ago about how we might accommodate a
mixture of storing and non-storing nodes in a network more efficiently
than making one of them leaf nodes. Searching through the ROLL mail
archives, it was clear at the time that there was no use case for
having a network that has a mixture of storing and non-storing nodes.
I wonder if this is necessarily true if there are devices from
multiple vendors. At the time, it was also speculated that the mixture
could also introduce unknown problems and no one seems to have a
working solution. The draft describes one of the problems that could
occur if we try to form a multi-hop network with storing and
non-storing nodes. That is a concrete first step towards getting a
handle on the challenge of having nodes with different capabilities in
a network.

Your guidance on whether this is an important problem worth working on
or the work is heading in a wrong direction would help evolve or stop
the work.

Thanks.

- om_p