RFC 9008, "Using RPI Option Type, Routing Header for Source Routes, and IPv6-in-IPv6 Encapsulation in the RPL Data Plane", April 2021

Errata ID: 7543
Status: Verified
Type: Technical
Publication Format(s) : TEXT, PDF, HTML
Reported By: Mathis Marion
Date Reported: 2023-06-14
Verifier Name: John Scudder
Date Verified: 2024-01-12

Section 6 says:

As the Rank information in the RPI artifact is changed at each hop, it
will typically be zero when it arrives at the DODAG root.

It should say:

As the Rank information in the RPI artifact is changed at each hop, it
will typically be non-zero when it arrives at the DODAG root.

Notes:

The SenderRank is 0 if:
- The packet comes from Internet (and has an RPI)
- The packet has not been forwarded (ie. if the source is a direct child of the DODAG root), as RFC 6550 section 11.2 tells to set SenderRank to 0 at the source.

The typical case is rather a packet that arrives at the DODAG root from a child node forwarding a packet, in which case SenderRank is set to DAGRank(rank) > 0.

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