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<p class="MsoNormal">Vint and Keith,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Given that we are really just getting started with building and deploying DTN and LTP based systems in space in any broad sense I think we are better off silverizing these now and nipping in the bud any expansion of these older protocols
we are trying to leave behind.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">With IPv4 vs IPv6 there was already a major deployment of IPv4 such that it could not easily be abandoned. In our case I think LTPv1 and BPv6 are more like IPv1, v2, and v3. They must have existed along the way to IPv4, but they are now
lost to the dusts of time. In the RFC Editor files there is not even a mention of these, but I assume that they existed at some point.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I worry with our current relatively small community that we will just start to build in more complexity if we perpetuate both versions of both of these key protocols.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards, Peter<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Vint Cerf <vint@google.com><br>
<b>Date: </b>Monday, October 11, 2021 at 7:18 AM<br>
<b>To: </b>Keith Scott <KSCOTT@mitre.org><br>
<b>Cc: </b>"Tomaso.deCola@dlr.de" <tomaso.decola@dlr.de>, Peter Shames <peter.m.shames@jpl.nasa.gov>, "sis-dtn@mailman.ccsds.org" <sis-dtn@mailman.ccsds.org>, "Gifford, Kevin" <Kevin.Gifford@colorado.edu><br>
<b>Subject: </b>Re: [Sis-dtn] [EXTERNAL] Re: [EXT] RE: LTP vs LTPv2<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">i think Keith and Leigh have correctly characterized the situation. I would stick with both as valid but incompatible. CF: IPv4 and IPv6'
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">v<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Oct 11, 2021 at 10:12 AM Dr. Keith L Scott <<a href="mailto:kscott@mitre.org">kscott@mitre.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Peter,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I think the real issue at hand is whether or not to maintain the LTPv1 spec as Blue once LTPv2 is published.
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">My interpretation of Leigh’s argument is that vendors are currently implementing to LTPv1 (and the current BPv6-based BP for CCSDS Book) and that deprecating those specs in favor
of new, non-backward-compatible ones would be looked upon unfavorably.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> v/r,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> --keith<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black"><a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a> <<a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a>><br>
<b>Date: </b>Monday, October 11, 2021 at 3:11 AM<br>
<b>To: </b><a href="mailto:peter.m.shames@jpl.nasa.gov" target="_blank">peter.m.shames@jpl.nasa.gov</a> <<a href="mailto:peter.m.shames@jpl.nasa.gov" target="_blank">peter.m.shames@jpl.nasa.gov</a>><br>
<b>Cc: </b>Dr. Keith L Scott <<a href="mailto:kscott@mitre.org" target="_blank">kscott@mitre.org</a>>, Gifford, Kevin <<a href="mailto:kevin.gifford@colorado.edu" target="_blank">kevin.gifford@colorado.edu</a>>,
<a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank">marc.sanchez.net@jpl.nasa.gov</a> <<a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank">marc.sanchez.net@jpl.nasa.gov</a>>,
<a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a> <<a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a>><br>
<b>Subject: </b>RE: [EXTERNAL] Re: [EXT] RE: LTP vs LTPv2</span><o:p></o:p></p>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB">Dear Peter,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB">Thank you for your kind support and availability for helping us in finding a suitable solution.
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB">Indeed the two options you have mentioned are also those we have put on the table as possible solutions, although both of them show pros and cons and therefore
compromise and agreement/consensus between the parties will have to be reached. This discussion will keep on going during the next DTN telco as well as the official CCSDS DTN WG Fall meetings in order to reach soon an agreed approach as also mentioned by Keith
in a previous e-mail. In case no solution will be agreed, then I’ll certainly bring this point in the SIS area summary at the CESG meeting in November in order to find a way out for this impasse. Obviously, I’ll certainly count on your and other CESG colleagues
suggestions to move forward and more importantly to avoid any postponed decision that would be detrimental to the activities of the DTN WG.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB">Best Regards</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB">Tomaso</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>From:</b> Shames, Peter M (US 312B) <<a href="mailto:peter.m.shames@jpl.nasa.gov" target="_blank">peter.m.shames@jpl.nasa.gov</a>>
<br>
<b>Sent:</b> Samstag, 9. Oktober 2021 01:26<br>
<b>To:</b> Kevin K Gifford <<a href="mailto:kevin.gifford@colorado.edu" target="_blank">kevin.gifford@colorado.edu</a>>; Dr. Keith L Scott <<a href="mailto:kscott@mitre.org" target="_blank">kscott@mitre.org</a>>; Cola, Tomaso de <<a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a>>;
Sanchez Net, Marc (US 332H) <<a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank">marc.sanchez.net@jpl.nasa.gov</a>><br>
<b>Cc:</b> <a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a><br>
<b>Subject:</b> Re: [EXTERNAL] Re: [EXT] RE: LTP vs LTPv2<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Guys,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">As a long term member of the CESG I do agree that you can kick it “upstairs” to the CESG and have, I believe, a hope of getting a sensible response (most of the time). Heck, we
are human and therefore fallible.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">From my own point of view I recommend doing two things:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<ol start="1" type="1">
<li class="gmail-m8154986756107230884msolistparagraph" style="mso-list:l1 level1 lfo1">
As I understand it, they are different protocols, hence not “backward compatible”. Using the “version” option, including, in this case, adopting some explicit name extension like LTPv2 makes the most sense to me. The rationale for that is that what you plan
to produce is not backward compatible with v1. In other words, there is no way to configure V2, without the new options, and still have a v1 implementation accept it.
<o:p></o:p></li><li class="gmail-m8154986756107230884msolistparagraph" style="mso-list:l1 level1 lfo1">
Silverize the v1 book. This is normally done when a new protocol version is created. The old silver book will still be available and it may be referenced with its (new) silver name and number. This has happened before with other specs. It is not unusual
for some mission to nail their interface to some specific version of a document, even, in some cases, a Red Book (which is really dangerous since they are likely to change).
<o:p></o:p></li></ol>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">If you want to discuss this further please let me know. And it you do decide to send it to the CESG you now know where I stand, and why. Of course, if any of my assumptions are
flawed I am happy to be corrected.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Cheers, Peter<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Kevin K Gifford <<a href="mailto:kevin.gifford@colorado.edu" target="_blank">kevin.gifford@colorado.edu</a>><br>
<b>Date: </b>Friday, October 8, 2021 at 11:58 AM<br>
<b>To: </b>Keith Scott <<a href="mailto:kscott@mitre.org" target="_blank">kscott@mitre.org</a>>, "<a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a>" <<a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a>>,
Marc Sanchez Net <<a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank">marc.sanchez.net@jpl.nasa.gov</a>><br>
<b>Cc: </b>"<a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a>" <<a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a>>, Peter Shames <<a href="mailto:peter.m.shames@jpl.nasa.gov" target="_blank">peter.m.shames@jpl.nasa.gov</a>>,
Kevin K Gifford <<a href="mailto:kevin.gifford@colorado.edu" target="_blank">kevin.gifford@colorado.edu</a>><br>
<b>Subject: </b>[EXTERNAL] Re: [EXT] RE: LTP vs LTPv2</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;color:black">Hi SIS-DTN - </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;color:black">FWIW, I want to emphasize that the CESG does a great job in this regard (fixing issues that arise in WGs or inter-WG conflicts or inter-agency
conflicts).</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;color:black">-- Keith was a member of the CESG for several years and understands this vital role that the CESG plays in issues such as this</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;color:black">Thus, my
<b>two cents worth</b> is await CESG advice as well as Keith already stated (I wanted to maybe ease any queasiness in regard to CESG involvement/inputs).</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;color:black">Thanks.</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;color:black">Kevin</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="color:black">From:</span></b><span style="color:black"> SIS-DTN <<a href="mailto:sis-dtn-bounces@mailman.ccsds.org" target="_blank">sis-dtn-bounces@mailman.ccsds.org</a>>
on behalf of Dr. Keith L Scott <<a href="mailto:kscott@mitre.org" target="_blank">kscott@mitre.org</a>><br>
<b>Sent:</b> Friday, October 8, 2021 12:49 PM<br>
<b>To:</b> <a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a> <<a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a>>;
<a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank">marc.sanchez.net@jpl.nasa.gov</a> <<a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank">marc.sanchez.net@jpl.nasa.gov</a>><br>
<b>Cc:</b> <a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a> <<a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a>><br>
<b>Subject:</b> Re: [Sis-dtn] [EXT] RE: LTP vs LTPv2</span> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="gmail-m8154986756107230884xmsonormal">OK fine, if the CESG decides to not rule on it, great, we’ll make a decision in the WG and they can live with it (and we can certainly discuss it SOME in the WG; don’t want to put too much time into it until the
CESG is at least given a chance to get us out of this).<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"> <o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"> --keith<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"> <o:p></o:p></p>
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<p class="gmail-m8154986756107230884xmsonormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black"><a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a> <<a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a>><br>
<b>Date: </b>Friday, October 8, 2021 at 10:04 AM<br>
<b>To: </b>Dr. Keith L Scott <<a href="mailto:kscott@mitre.org" target="_blank">kscott@mitre.org</a>>,
<a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank">marc.sanchez.net@jpl.nasa.gov</a> <<a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank">marc.sanchez.net@jpl.nasa.gov</a>><br>
<b>Cc: </b><a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a> <<a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a>><br>
<b>Subject: </b>RE: [EXT] RE: LTP vs LTPv2</span><o:p></o:p></p>
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<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB">Hi Keith,</span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB">I agree with your point on troubles in maintaining two books and the fact that this will imply the same treatment for BPv7. Then whether agencies are happy to refer to a silver book rather than
a blue book is a bit question mark in my opinion. I remember we decided a few years ago not to silverize SCPS-TP exactly because there were activities or usage of the corresponding blue book.</span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB">We can certainly bring this matter to the next CESG meeting, although I fear that there might be no strict decision in this regard, since I think there is no specific rule again either approaches
and the hot potato could be sent back to WG.</span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB">Regards,</span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB">Tomaso</span><o:p></o:p></p>
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<p class="gmail-m8154986756107230884xmsonormal"><b>From:</b> Dr. Keith L Scott <<a href="mailto:kscott@mitre.org" target="_blank">kscott@mitre.org</a>>
<br>
<b>Sent:</b> Freitag, 8. Oktober 2021 15:52<br>
<b>To:</b> Cola, Tomaso de <<a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a>>;
<a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank">marc.sanchez.net@jpl.nasa.gov</a><br>
<b>Cc:</b> <a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a><br>
<b>Subject:</b> Re: [EXT] RE: LTP vs LTPv2<o:p></o:p></p>
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<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal">I don’t like it, but I propose that the WG move forward with developing the book and you bring up the new-version vs. new-book issue to the CESG.<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"> <o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal">Reasons I don’t like the two-book solution:<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"> <o:p></o:p></p>
<ul type="disc">
<li class="gmail-m8154986756107230884xmsolistparagraph" style="mso-list:l0 level1 lfo2">
So now we’re maintaining two versions of LTP, which version are folks supposed to choose for missions going forward? They’ll choose the one with flight heritage, right?<o:p></o:p></li><li class="gmail-m8154986756107230884xmsolistparagraph" style="mso-list:l0 level1 lfo2">
We’ll have to do the same thing with BPv7<o:p></o:p></li><li class="gmail-m8154986756107230884xmsolistparagraph" style="mso-list:l0 level1 lfo2">
There’s a version number in the header; receivers will know what was sent.<o:p></o:p></li><li class="gmail-m8154986756107230884xmsolistparagraph" style="mso-list:l0 level1 lfo2">
The book as Silver is still reference-able. If folks have systems they’re building to the current (v1) book, they can switch to referencing the silver book.<o:p></o:p></li><li class="gmail-m8154986756107230884xmsolistparagraph" style="mso-list:l0 level1 lfo2">
Why don’t we do that with ALL CCSDS books, backward-compatible or not?<o:p></o:p></li></ul>
<p class="gmail-m8154986756107230884xmsonormal"> <o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal" style="margin-left:.5in">--keith<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal" style="margin-left:.5in"> <o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"> <o:p></o:p></p>
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<p class="gmail-m8154986756107230884xmsonormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black"><a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a> <<a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a>><br>
<b>Date: </b>Friday, October 8, 2021 at 4:19 AM<br>
<b>To: </b><a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank">marc.sanchez.net@jpl.nasa.gov</a> <<a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank">marc.sanchez.net@jpl.nasa.gov</a>>, Dr. Keith L Scott <<a href="mailto:kscott@mitre.org" target="_blank">kscott@mitre.org</a>><br>
<b>Cc: </b><a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a> <<a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a>><br>
<b>Subject: </b>[EXT] RE: LTP vs LTPv2</span><o:p></o:p></p>
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<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB">Then probably we should better keep two books, one with the “old LTP” for which we’ll do some pink sheets to fix some inconsistencies and another one (the new LTP). In such a away we could have
two versions of LTP available, similarly to IPv4 and IPv6 in IETF. Probably we may have to slightly change the title of the books (v1 and v2?) to have a clear demarcation between the two version of the protocols and avoid any ambiguity.</span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB"><a href="mailto:kscott@mitre.org" target="_blank"><span style="text-decoration:none">@Scott, Keith L.</span></a>:what do you think?</span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB">Tomaso</span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB"> </span><o:p></o:p></p>
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<p class="gmail-m8154986756107230884xmsonormal"><b>From:</b> SIS-DTN <<a href="mailto:sis-dtn-bounces@mailman.ccsds.org" target="_blank">sis-dtn-bounces@mailman.ccsds.org</a>>
<b>On Behalf Of </b>Sanchez Net, Marc (US 332H) via SIS-DTN<br>
<b>Sent:</b> Donnerstag, 7. Oktober 2021 00:21<br>
<b>To:</b> <a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a><br>
<b>Subject:</b> [Sis-dtn] LTP vs LTPv2<o:p></o:p></p>
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<p class="gmail-m8154986756107230884xmsonormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal">All,<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"> <o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal">I had to leave today’s meeting early. Did we reach consensus on how to proceed?<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"> <o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal">Also, I will note that some colleagues at JPL (I have similar concerns) do not really like the idea of turning the current version of LTP into a silver book. The problem is that, by definition, a silver book implies
that a protocol is deprecated or obsolete, but several systems that are being built today use BPv6+LTP or BPv7+LTP and thus might be in operation for a long time. So, essentially, we are “telling” industry that they have developed an already obsolete standard?<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"> <o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal">Best,<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal">-----------------------------------------------------------------------------------------------------------------------<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal">Marc Sanchez Net<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"><span style="font-size:10.0pt;color:gray">Telecommunications Engineer</span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal" style="background:white"><span style="font-size:10.0pt;color:gray">Jet Propulsion Laboratory</span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal" style="background:white"><span style="font-size:10.0pt;color:gray">Office:</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222"> </span><span style="color:black"><a href="tel:(818)%20393-5840" target="_blank"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0070C0">(818)
354-1650</span></a></span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0070C0">
</span><span style="font-size:10.0pt;color:gray">|</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0070C0">
</span><span style="font-size:10.0pt;color:gray">Email:</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222"> </span><span style="color:black"><a href="mailto:marc.sanchez.net@jpl.nasa.gov" target="_blank"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">marc.sanchez.net@jpl.nasa.gov</span></a></span><o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal">-----------------------------------------------------------------------------------------------------------------------<o:p></o:p></p>
<p class="gmail-m8154986756107230884xmsonormal"> <o:p></o:p></p>
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