[icnrg] ICNLoWPAN Document Action

Cenk Gündoğan <mail+ietf@gundogan.net> Wed, 15 September 2021 07:01 UTC

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From: Cenk =?utf-8?B?R8O8bmRvxJ9hbg==?= <mail+ietf@gundogan.net>
To: icnrg@irtf.org
Cc: Colin Perkins <csp@csperkins.org>
Date: Wed, 15 Sep 2021 08:26:43 +0200
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Subject: [icnrg] ICNLoWPAN Document Action
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Dear group,

Table 2 of the ICNLoWPAN document [1] requests IANA updates to the
"6LoWPAN Dispatch Type Field" registry.  The last entry of table 2
clashes, however, with an existing registration. (11 11xxxx for "Page
dispatch").

The solution is simple: we increase the prefix for the last entry from
"11 1xxxxx" to "11 10xxxx".  This decreases the option space for
dispatches, but that particular dispatch (Figure 26) has a "Reserved"
bit, which we can drop to increase it again.

This:
 0                                       1
 0   1   2   3   4   5   6   7   8   9   0   1   2   3   4   5	 	  
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+	  
| 1 | 1 | 1 |CID|EXT|VER|FLG|FRS|PAY|RCT|MGH| PLTYP |EXP|VAL|RSV|	  
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+	  
  	
Becomes:
0                                       1
0   1   2   3   4   5   6   7   8   9   0   1   2   3   4   5	        
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+	
| 1 | 1 | 1 | 0 |VER|FLG|FRS|PAY|RCT|MGH| PLTYP |EXP|VAL|CID|EXT|	
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+	

This diff [2] summarizes the necessary changes, it also moves the CID
and EXT bits of all dispatches to the end to keep the styling
harmonized.

What does the group think about this proposed solution?  Are there any
objections?  To let it sufficiently marinate, feedback is very welcome
until wednesday next week :-)

Cheers,
Cenk

[1] https://datatracker.ietf.org/doc/html/draft-irtf-icnrg-icnlowpan-10
[2] https://tools.ietf.org//rfcdiff?url1=draft-irtf-icnrg-icnlowpan-10&url2=https://inet.haw-hamburg.de/tmp/draft-irtf-icnrg-icnlowpan-11.txt/@@download/file/draft-irtf-icnrg-icnlowpan-11.txt

--
Cenk Gündoğan

Hamburg University of Applied Sciences
Dept. of Computer Science / Internet Technologies Group
Berliner Tor 7, 20099 Hamburg, Germany
Fon: +49 40 42875 - 8426
Mail: cenk.guendogan@haw-hamburg.de
Web: https://www.inet.haw-hamburg.de/