RFC 6719, "The Minimum Rank with Hysteresis Objective Function", September 2012

Errata ID: 7773
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Dominique Barthel
Date Reported: 2024-01-22
Verifier Name: John Scudder
Date Verified: 2024-02-07

Section 2.2 says:

If the cost 
of the path through the preferred parent and the worst parent is too 
large, a node MAY keep a smaller parent set than PARENT_SET_SIZE.

It should say:

If the difference in cost of the paths through the preferred parent 
and the worst parent is too large, a node MAY keep a smaller parent 
set than PARENT_SET_SIZE.

Notes:

This sentence is meant to explain that there is no benefit in keeping in the parent set neighbors that have too high a path cost compared to that of the preferred parent.
The original text omits the notion of difference in cost. It also contains a circular reference: indeed, the worst parent is the neighbor within the parent set that has the highest cost.

Verifier's note: the submitter also included this option:

```
or better yet

"A node MAY keep a parent set smaller than PARENT_SET_SIZE, so that
the difference in cost of the paths through the preferred parent and
the worst parent is not too large."
```

I agree this is a clearer way to express the concept and I think it should be considered if there's ever a bis prepared of the spec, however, I elected to verify the first option given because it represents the minimal change needed to make the document correct.

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