2020-02-26, rev -36: This document looks at different data flows through LLN (Low-Power and Lossy Networks) where RPL (IPv6 Routing Protocol for Low-Power and Lossy Networks) is used to establish routing. The document enumerates the cases where RFC6553 (RPI option Type), RFC6554 (Routing Header for Source Routes) and IPv6-in-IPv6 encapsulation is required in data plane. This analysis provides the basis on which to design efficient compression of these headers. This document updates RFC6553 adding a change to the RPI option Type. Additionally, this document updates RFC6550 defining a flag in the DIO Configuration option to indicate about this change and updates RFC8138 as well to consider the new Option Type when the RPL Option is decompressed.
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