RFC 7774, "Multicast Protocol for Low-Power and Lossy Networks (MPL) Parameter Configuration Option for DHCPv6", March 2016

Errata ID: 5063
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: James K.
Date Reported: 2017-07-06
Held for Document Update by: Alvaro Retana
Date Held: 2017-11-06

Section 2.1 says:

   C_T_EXP (unsigned 16-bit integer):
      CONTROL_MESSAGE_TIMER_EXPIRATIONS.  0 and 0xffff are reserved and
      MUST NOT be used.

It should say:

   C_T_EXP (unsigned 16-bit integer):
      CONTROL_MESSAGE_TIMER_EXPIRATIONS.  0xffff is reserved and
      MUST NOT be used.

Notes:

[RFC 7731] states:

9.3. MPL Data Message Processing

o If the MPL Control Message Trickle timer is not running and
CONTROL_MESSAGE_TIMER_EXPIRATIONS is non-zero, the MPL Forwarder
MUST initialize and start the MPL Control Message Trickle timer.

10.2. MPL Control Message Transmission

An MPL Forwarder transmits MPL Control Messages using the Trickle
algorithm. An MPL Forwarder maintains a single Trickle timer for
each MPL Domain. When CONTROL_MESSAGE_TIMER_EXPIRATIONS is 0, the
MPL Forwarder does not execute the Trickle algorithm and does not
transmit MPL Control Messages.

Thus, 0 is a valid configuration for C_T_EXP to disable Reactive Forwarding.

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[Alvaro Retana]

The pointer to rfc7731 seems to indicate that the description for CONTROL_MESSAGE_TIMER_EXPIRATIONS is incorrect. However, this document uses Normative language to define the C_T_EXP parameter.

I am then not marking this report as Verified, but as "Hold for Document Update", which means that when this document is updated, the validity should be considered then. [1]

[1] https://www.ietf.org/iesg/statement/errata-processing.html

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