Re: [Roll] WG Adoption for turnon-8138 at IETF 106

Rahul Jadhav <> Wed, 18 December 2019 00:57 UTC

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From: Rahul Jadhav <>
Date: Wed, 18 Dec 2019 08:56:48 +0800
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To: Routing Over Low power and Lossy networks <>
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Subject: Re: [Roll] WG Adoption for turnon-8138 at IETF 106
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> Adding to the WG record, that that draft is using a reserved bits for configuring the RPL DAG, and it is using it for configuring the data compression. The argument on the WG list with authors was WHY that use of reserved (important question), IMO they did not answer that but asked for another proposal.

I was skeptical too about using a reserved bit in DIO Config option
for handshaking a compression flag. But the proposition of using the
reserved bit for MOP<7 made sense to me. We certainly can't set this
flag in DIO base object or any other place in DIO. The reserved bit is
part of DIO Configuration option, and the indication of compression
flag also is a form of DAG-wide configuration. Thus it fits ok
principally too!

Anyways, it would be interesting to learn of other ways from the WG.
8138 is useful and for it to be put to use in existing networks, such
a flag/compression handshake is necessary.