[Roll] quasem load-balancing: Figure 3: The amended DIO message format

Michael Richardson <mcr+ietf@sandelman.ca> Thu, 30 March 2017 17:29 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: roll@ietf.org
cc: draft-qasem-roll-rpl-load-balancing@ietf.org
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Date: Thu, 30 Mar 2017 13:29:12 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/W-hLOB5_vsn6nVet3zssKijFa6Q>
Subject: [Roll] quasem load-balancing: Figure 3: The amended DIO message format
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In draft-qasem-roll-rpl-load-balancing, you show:

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | RPLInstanceID |Version Number |             Rank              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |G|0| MOP | Prf |     DTSN      |     Flags     |   Reserved    |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       +                                                               +
       |                                                               |
       +                            DODAGID                            +
       |                                                               |
       +                                                               +
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                                                               |
       +                                                               +
       |                                                               |
       +                            Parent Address                     +
       |                                                               |

That is, you have changed the DIO Base Object in a non-backwards compatible
way.   There is no way to deploy this without upgrading all nodes.

Please instead, define a new DIO Option. This is trivially done and is
easily incrementally deployable.

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
IETF ROLL WG outgoing co-chair.    http://datatracker.ietf.org/wg/roll/charter/