# RFC Errata

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## Status: Reported (1)

### RFC 8180, "Minimal IPv6 over the TSCH Mode of IEEE 802.15.4e (6TiSCH) Configuration", May 2017

Source of RFC: 6tisch (int)

Errata ID: 5539
Status: Reported
Type: Editorial
Publication Format(s) : TEXT

Reported By: Yasuyuki Tanaka
Date Reported: 2018-10-29

Section 5 says:

```(...)

The Rank computation is described in Section 4.1 of [RFC6552].  A
node's Rank (see Figure 4 for an example) is computed by the
following equations:

R(N) = R(P) + rank_increment

rank_increment = (Rf*Sp + Sr) * MinHopRankIncrease

(...)

This section illustrates the use of OF0 (see Figure 4).  We have:

rank_increment = ((3*numTx/numTxAck)-2)*minHopRankIncrease = 512

```

It should say:

```(...)

The Rank computation is described in Section 4.1 of [RFC6552].  A
node's Rank (see Figure 4 for an example) is computed by the
following equations:

R(N) = R(P) + rank_increase

rank_increase = (Rf*Sp + Sr) * MinHopRankIncrease

(...)

This section illustrates the use of OF0 (see Figure 4).  We have:

rank_increase = ((3*numTx/numTxAck)-2)*minHopRankIncrease = 512

```

Notes:

s/rank_increment/rank_increase/

It'd be better to use "rank_increase" as the variable name for consistency, which is used in Section 4.1 of RFC 6552 (https://tools.ietf.org/html/rfc6552#section-4.1):

[excerpt from RFC 6552]

The step_of_rank Sp that is computed for that link is multiplied by
the rank_factor Rf and then possibly stretched by a term Sr that is
less than or equal to the configured stretch_of_rank. The resulting
rank_increase is added to the Rank of preferred parent R(P) to obtain
that of this node R(N):

R(N) = R(P) + rank_increase where:

rank_increase = (Rf*Sp + Sr) * MinHopRankIncrease

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