Re: [dtn] [EXTERNAL] IANA section on bpbis

"Marc Blanchet" <marc.blanchet@viagenie.ca> Wed, 23 October 2019 23:11 UTC

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From: "Marc Blanchet" <marc.blanchet@viagenie.ca>
To: "Burleigh, Scott C" <scott.c.burleigh@jpl.nasa.gov>
Cc: draft-ietf-dtn-bpbis@ietf.org, dtn@ietf.org
Date: Thu, 24 Oct 2019 01:11:13 +0200
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Subject: Re: [dtn] [EXTERNAL] IANA section on bpbis
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On 24 Oct 2019, at 0:35, Burleigh, Scott C (US 312B) wrote:

> On re-reading these proposals for merging registries more closely, I 
> realize that they actually constitute significant changes to the BPv7 
> protocol specification.  Notably, the proposal to merge the bit flag 
> values for bundle processing control flags would require that each 
> BPv7 primary block contain a 3-byte control flags field -- rather than 
> a 2-byte field -- to accommodate 6 bits of BPv6 class of service 
> indication that the WG has agreed not to include in the BP 
> specification; we will be wasting 1 byte of every bundle to preserve 
> bit flag position compatibility with RFC 5050.

I think one byte is not a big deal. It also provides more room for 
future assignments. Considering that I’ve seen DTN bundle payloads 
containing non-compressed XML or deployments sending Video over RTP over 
DTN, I think this one byte is not an issue.

>
> Also the block numbers assigned to extension blocks are changed for 
> compatibility with RFC 5050; not a huge deal, but this will 
> temporarily break all existing implementations of BPv7.  (The other 
> changes are less disruptive.)

well. In fact, the proposed numbers by the author in an internet-draft 
are never garanteed until IANA creates/updates the registry when the RFC 
is in the RFC-editor queue (i.e. after IESG approval). Changing an enum 
value in an implementation is a question of one minute. There is to my 
knowledge no deployment of BP7 yet, nor commercial products of BP7. 
However, having a coherent set of enum values for both BP6 and BP7 is to 
me a great advantage for implementations.

>
> I can certainly go ahead and make all these changes, but I want to 
> confirm with the WG that this is what we want to do.

let’s see what others think.

Marc, as individual.


>
> Scott
>
> -----Original Message-----
> From: Marc Blanchet <marc.blanchet@viagenie.ca>;
> Sent: Wednesday, October 23, 2019 4:45 AM
> To: Magnus Westerlund <magnus.westerlund@ericsson.com>;; Burleigh, 
> Scott C (US 312B) <scott.c.burleigh@jpl.nasa.gov>;
> Cc: draft-ietf-dtn-bpbis@ietf.org; dtn@ietf.org
> Subject: [EXTERNAL] Re: [dtn] IANA section on bpbis
>
> Magnus and Scott,
>   all fine, please proceed!
>
>   Scott, please make sure to review not only the IANA Considerations 
> section, but also the text in the referred sections so everything is 
> in sync.
>
> Marc.
>
> On 23 Oct 2019, at 13:23, Magnus Westerlund wrote:
>> Hi,
>>
>> I have reviewed your proposal Marc. I think most of it works but 
>> there
>> are  few things I do wonder over or think should be addressed.
>>
>>
>> 10.6: This is a BP specific registry. As this encodes the URI schemes
>> into the
>> protocol in a short form. This is not the same as the URI scheme
>> registry.
>>
>> Thus, I don't see how it can be skipped.
>>
>> But, maybe the name of the registry should be "Bundle Protocol URI
>> Scheme Type
>> Registry".
>>
>> 10.7 I already responded seperately to Scott's question. But, I think
>> the WG do
>> need to update the IANA Registration of the DTN URI scheme 
>> considering
>> that it
>> is provisional and lacks a correct reference to its actual 
>> syntactical
>> definition.
>>
>>
>> Cheers
>>
>> Magnus Westerlund
>>
>>
>> ----------------------------------------------------------------------
>> Networks, Ericsson Research
>> ----------------------------------------------------------------------
>> Ericsson AB                 | Phone  +46 10 7148287
>> Torshamnsgatan 23           | Mobile +46 73 0949079
>> SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com
>> ----------------------------------------------------------------------