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<p class="MsoNormal"><span style="font-size:14.0pt">We had a lightly-attended SIS-DTN mtg today. Notes are here:
<a href="https://cwe.ccsds.org/fm/wiki/SitePages/20210324.aspx">https://cwe.ccsds.org/fm/wiki/SitePages/20210324.aspx</a> and below.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> v/r,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> --keith<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><u><span style="font-size:10.0pt;color:black"><o:p><span style="text-decoration:none"> </span></o:p></span></u></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><b><span style="font-size:10.0pt;color:#7F7F7F">Dr. Keith Scott
<o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><b><span style="font-size:10.0pt;color:#7F7F7F">L110 Chief Architect, Advanced Networking for Assured Communications<o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><b><span style="font-size:10.0pt;color:#7F7F7F">Office: 703.983.6547<o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><b><span style="font-size:10.0pt;color:#7F7F7F">Cell: 301.437.4472<o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><b><span style="font-size:10.0pt;color:#7F7F7F">Email:
<a href="mailto:kscott@mitre.org">kscott@mitre.org</a></span></b><span style="font-size:10.0pt;color:#7F7F7F"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><span style="font-size:10.0pt;color:black"><a href="http://www.mitre.org/"><b>The MITRE Corporation</b></a><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><b><span style="font-size:10.0pt;color:#7F7F7F">M/S J500</span></b><span style="font-size:10.0pt;color:#7F7F7F"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><b><span style="font-size:10.0pt;color:#7F7F7F">7596 Colshire Drive</span></b><span style="font-size:10.0pt;color:#7F7F7F"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><b><span style="font-size:10.0pt;color:#7F7F7F">McLean, VA 22102</span></b><span style="font-size:10.0pt;color:#7F7F7F"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:14.0pt;text-autospace:none"><b><span style="font-size:10.0pt;color:#7F7F7F"> </span></b><span style="font-size:10.0pt;color:#7F7F7F"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:#7F7F7F">MITRE self-signs its own certificates. Information about the MITRE PKI Certificate Chain is available from <a href="https://www.mitre.org/tech/mii/pki/"><span style="color:#7F7F7F">https://www.mitre.org/tech/mii/pki/</span></a></span></b><span style="font-size:10.0pt;color:#7F7F7F"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:25.5pt;font-family:"Segoe UI Light",sans-serif;color:#0072C6">SIS-DTN WG Mtg20210324<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444"><a href="https://cwe.ccsds.org/fm/wiki/SitePages/SIS-DTN.aspx"><span style="color:#0072C6">SIS-DTN Home</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444"><o:p> </o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:16.0pt;font-family:"Segoe UI Semilight",sans-serif;color:#0072C6">LTP<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444">Updates to LTP Things List<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.5pt;font-family:"Segoe UI Semilight",sans-serif;color:#262626">Discussion: How many configurations should be mandatory to implement?<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:#444444;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif">Have one implementation (maybe the mandatory one?) use variable-length fields?<o:p></o:p></span></li><li class="MsoNormal" style="color:#444444;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif">What if we don’t mandate ANY required-to-implement configuration?<o:p></o:p></span></li><li class="MsoNormal" style="color:#444444;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif">Josh argues for at least one mandatory to ensure some interoperability<o:p></o:p></span></li><li class="MsoNormal" style="color:#444444;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif">Still no auto-negotiation of which profile to use -- that’s still configuration<o:p></o:p></span></li><li class="MsoNormal" style="color:#444444;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif">Stripped-down fixed-length field version for mandatory implementation would be OK.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444">Should CCSDS mandate implementation of at least one interoperable profile?<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#777777">Pros:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:#444444;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo2">
<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif">There would be at least one profile that you could guarantee would work with all LTP implementations. A user picking up two LTP iplementations would be guaranteed that they could at least be
made to interoperate (even if the mandatory profile doesn't produce particuarly good performance).<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#777777">Cons:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:#444444;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo3">
<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif">Requires implementers to implement something that they might not ever use.<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444">Need to think on this more.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:16.0pt;font-family:"Segoe UI Semilight",sans-serif;color:#0072C6">BPv7<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:7.5pt"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444">See the <a href="https://cwe.ccsds.org/fm/wiki/SitePages/BPv7%20Update%202021.aspx"><span style="color:#0072C6">BPv7 Update Page</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:7.5pt"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444">Non-singleton-destination stuff in draft-31<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:7.5pt"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444">Changes to dispatching and forwarding failed subsections<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:7.5pt"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444">Inclusion of DTN URI Scheme (CCSDS spec required use of the ipn naming scheme); use of IMC naming scheme.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:7.5pt"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444">Discovery mechanism? More targeted at human spaceflight / lunar exploration? What link-layer mechanism to use (USLP? USLP with
some sort of modified COP?) Need some sort of broadcast address? Prox-1?<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:7.5pt"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444">Something to force identification of connecting nodes at the CLA level? Make them send a bundle with a previous-hop-block when you
establish a connection? Needs to be part of the (all?) CLA protocol(s).<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:7.5pt"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444">@Keith: Cross-check this stuff with:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:#444444;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo4">
<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif">Lee's briefing at CCSDS last year<o:p></o:p></span></li><li class="MsoNormal" style="color:#444444;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo4">
<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif">Jonathan Wilmot's deisred capabilities<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444">And build out a spreadsheet of<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#444444"><br>
<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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