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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi Felix,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I think you raised a very valid point, i.e. to possibly restrict to scenarios that are of interest for planned or future space missions. In addition to UDPCL, I’m also wondering whether we are going
to have missions planning to use BP/TCP in space. Any thoughts on it?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Tomaso<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Felix.Flentge@esa.int <Felix.Flentge@esa.int>
<br>
<b>Sent:</b> Freitag, 13. Mai 2022 12:10<br>
<b>To:</b> sis-dtn@mailman.ccsds.org<br>
<b>Cc:</b> beau.t.blanding@nasa.gov; Cola, Tomaso de <Tomaso.deCola@dlr.de><br>
<b>Subject:</b> Re: [Sis-dtn] Clean version of the CCSDS BPv7 Red Book draft<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Hi,</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">the situations regarding UDPCL is unfortunately a bit messy. We have:</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">1) Annex B4 in CCSDS 734.2-B-1</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">2) there is RfC 7122 in I<b>R</b>TF</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">3) expired UDPCL draft in IETF
</span><a href="https://datatracker.ietf.org/doc/draft-sipos-dtn-udpcl/"><span style="font-size:12.0pt">draft-sipos-dtn-udpcl-01 - Delay-Tolerant Networking UDP Convergence Layer Protocol (ietf.org)</span></a><span style="font-size:12.0pt">
</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">In terms of BP encoding, they are basically the same (just put a bundle in UDP datagram payload, called unframed transfer in the IETF draft). 3) goes beyond that as it also includes DTLS / Keep-alive
/ CL-Layer fragmentation).</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">I think we really need to understand the 'space use cases' to make a good decision what to include (or wait for UDPCL in IETF). In general, it does not appear to me to useful in (most) space scenarios
(besides testing) as at least the simple approach has some limitation (bundle sizes should be small to avoid IP fragmentation, need for explicit congestion control). I think what we should try to avoid is that we get protocol stacks like BP / UDPCL / UDP /
IPE / EPP when BP / EPP would be enough.</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Regards,</span> <br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Felix</span> <br>
<br>
<br>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Tomaso de Cola via SIS-DTN" <<a href="mailto:sis-dtn@mailman.ccsds.org">sis-dtn@mailman.ccsds.org</a>></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif"><<a href="mailto:beau.t.blanding@nasa.gov">beau.t.blanding@nasa.gov</a>></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Cc: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif"><a href="mailto:sis-dtn@mailman.ccsds.org">sis-dtn@mailman.ccsds.org</a></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">13/05/2022 09:59</span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Re: [Sis-dtn] Clean version of the CCSDS BPv7 Red Book draft</span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Sent by: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"SIS-DTN" <<a href="mailto:sis-dtn-bounces@mailman.ccsds.org">sis-dtn-bounces@mailman.ccsds.org</a>></span>
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt">Dear Beau,<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt">Thank you for sharing the clean version. Just a few quick comments on the CLA annex:<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"> <o:p></o:p></p>
<p class="MsoNormal"><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">1. </span>For UDPCLA, shall we point to RFC 7122?
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">2. </span>As mentioned by Felix, we should have dedicated text for EPP and SPP. Let’s take also into account (probably with a note) that with the new version of SPP there exists no dedicated
APID for BP or LTP. On the contrary, EPP has dedicated protocol identifiers (available also in SANA) for pointing to BP or LTP.
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">3. </span>I’m not quite sure that we can add a USLPCLA since so far (i.e. for what available in the current USLP spec), the UPID defined in USLP TFZ points only to EPP or SPP. Then BP/LTP
has to be encapsulated over either of these two, but cannot go directly into USLP. If we see relevant to have direct encapsulation, I think we should pass this requirement to Greg and the SLP folks to see if they can accommodate this into a new version of
USLP. After that we can have a dedicated USLPCLA, otherwise I’m afraid the BPv7 would be inconsistent with the current USLP spec in this respect.
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">4. </span>It is stated that the largest bundle over LTP cannot be more than 4GB: where does this requirement come from?
<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt">Thank you for the clarification,<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt">Tomaso<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"><b>From:</b> SIS-DTN <<a href="mailto:sis-dtn-bounces@mailman.ccsds.org">sis-dtn-bounces@mailman.ccsds.org</a>>
<b>On Behalf Of </b>Blanding, Beau T. (MSFC-HP27)[HOSC SERVICES CONTRACT] via SIS-DTN<b><br>
Sent:</b> Donnerstag, 12. Mai 2022 21:43<b><br>
To:</b> <a href="mailto:sis-dtn@mailman.ccsds.org">sis-dtn@mailman.ccsds.org</a><b><br>
Subject:</b> [Sis-dtn] Clean version of the CCSDS BPv7 Red Book draft<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt">Hello all,<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt">Attached is the clean version of the BPv7 Red Book, where most of the changes present have been accepted. I unfortunately do not have access to the google box right now, so there is one place that has not been completely
cleaned up according to the edits that were made on the google box version (beginning of section 2.1). I was able to take the proper notes on everything else and apply it to the clean version.<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt">Thank you,<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:16.0pt">Beau Blanding</span><o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt">HOSC Systems Engineer<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt">MSFC 4663, Office C121<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"><a href="mailto:beau.t.blanding@nasa.gov"><span style="color:#0082BF">beau.t.blanding@nasa.gov</span></a><o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"> <tt><span style="font-size:10.0pt">_______________________________________________</span></tt><span style="font-size:10.0pt;font-family:"Courier New""><br>
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