Re: [icnrg] draft-irtf-icnrg-icnlowpan-08.txt

Carsten Bormann <cabo@tzi.org> Wed, 12 August 2020 18:54 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Subject: Re: [icnrg] draft-irtf-icnrg-icnlowpan-08.txt
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Hi,

I am currently looking at draft-irtf-icnrg-icnlowpan-08.
I have a number of editorial comments I will send you when I have completed my review, but there also is a technical comment that I think needs to be fixed before this is going forward.

Section 12 has this table of allocations desired:

    +=============+======+===========================================+
    | Bit Pattern | Page | Header Type                               |
    +=============+======+===========================================+
    |  00 0xxxxx  | TBD1 | Uncompressed NDN Interest messages        |
    +-------------+------+-------------------------------------------+
    |  00 1xxxxx  | TBD1 | Uncompressed NDN Data messages            |
    +-------------+------+-------------------------------------------+
    |  01 0xxxxx  | TBD1 | Compressed NDN Interest messages          |
    +-------------+------+-------------------------------------------+
    |  01 1xxxxx  | TBD1 | Compressed NDN Data messages              |
    +-------------+------+-------------------------------------------+
    |  10 0xxxxx  | TBD1 | Uncompressed CCNx Interest messages       |
    +-------------+------+-------------------------------------------+
    |  10 1xxxxx  | TBD1 | Uncompressed CCNx Content Object messages |
    +-------------+------+-------------------------------------------+
    |  11 0xxxxx  | TBD1 | Compressed CCNx Interest messages         |
    +-------------+------+-------------------------------------------+
    |  11 1xxxxx  | TBD1 | Compressed CCNx Content Object messages   |
    +-------------+------+-------------------------------------------+

         Table 1: Dispatch types for NDN and CCNx with page TBD1.

Compare the registry at https://www.iana.org/assignments/_6lowpan-parameters/_6lowpan-parameters.txt :

   11 11xxxx   0-15 Page switch             [RFC8025]

So none of the free pages (TBD1 values) can fulfill this request.

It seems to me that this can easily be repaired by using two half pages instead of a full page, e.g. by indicating NDN vs. CCNx in the page number instead of the P bit (the most significant bit, which is now the P bit, would always be 0).

What have you been using in the existing experiments?

Grüße, Carsten