This document is compact and extremely readable, with a clearly articulated problem statement and sound solution. From an IoT perspective, it looks like the proposed mechanism should have a beneficial impact on the operation of BABEL on LLNs, which is great. I also very much appreciate that the impact on node's per-neighbour state increase is clearly identified and measured (ยง4). Small note: similarly impacting reordering patterns could also occur in cellular networks during handover. Thank you authors and WG.