4.1. Multipoint-to-Point Traffic

Multipoint-to-point (MP2P) is a dominant traffic flow in many LLN applications ([RFC5867], [RFC5826], [RFC5673], and [RFC5548]). The destinations of MP2P flows are designated nodes that have some application significance, such as providing connectivity to the larger Internet or core private IP network. RPL supports MP2P traffic by allowing MP2P destinations to be reached via DODAG roots.