<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Ray, Timothy J. (GSFC-583.0) wrote:
<blockquote
cite="mid:C3B9C435D7725E4EABE2B62200A42C12AFA6C3@NDMSEVS36A.ndc.nasa.gov"
type="cite">
<meta http-equiv="Content-Type" content="text/html; ">
<meta name="Generator" content="Microsoft Word 11 (filtered)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"MS Mincho";
panose-1:2 2 6 9 4 2 5 8 3 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"\@MS Mincho";
panose-1:2 2 6 9 4 2 5 8 3 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
p.StyleParagraph4Kernat14pt, li.StyleParagraph4Kernat14pt, div.StyleParagraph4Kernat14pt
{margin-top:12.0pt;
margin-right:0in;
margin-bottom:0in;
margin-left:0in;
margin-bottom:.0001pt;
text-align:justify;
line-height:14.0pt;
font-size:12.0pt;
font-family:"Times New Roman";}
p.styleparagraph4kernat14pt0, li.styleparagraph4kernat14pt0, div.styleparagraph4kernat14pt0
{margin-top:12.0pt;
margin-right:0in;
margin-bottom:0in;
margin-left:0in;
margin-bottom:.0001pt;
text-align:justify;
line-height:14.0pt;
font-size:12.0pt;
font-family:"Times New Roman";}
span.emailstyle18
{font-family:Arial;
color:windowtext;}
span.EmailStyle20
{font-family:Arial;
color:navy;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;}
div.Section1
{page:Section1;}
/* List Definitions */
ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
-->
</style>
<div class="Section1">
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">David,</span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><br>
I like your idea of sending a ‘you-are-dead’ to the node whose
death has been imputed.</span></font></p>
</div>
</blockquote>
I agree with Tim's original post -- let's discuss in Berlin.<br>
<br>
Scott
<blockquote
cite="mid:C3B9C435D7725E4EABE2B62200A42C12AFA6C3@NDMSEVS36A.ndc.nasa.gov"
type="cite">
<div class="Section1">
<div>
<div class="MsoNormal" style="text-align: center;" align="center"><font
face="Times New Roman" size="3"><span style="font-size: 12pt;">
<hr tabindex="-1" align="center" size="2" width="100%"></span></font></div>
<p class="MsoNormal"><b><font face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font
face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma;"> Edell, David J.
[<a class="moz-txt-link-freetext" href="mailto:David.Edell@jhuapl.edu">mailto:David.Edell@jhuapl.edu</a>] <br>
<b><span style="font-weight: bold;">Sent:</span></b> Wednesday,
September 10,
2008 4:53 PM<br>
<b><span style="font-weight: bold;">To:</span></b> Ray, Timothy J.
(GSFC-583.0);
<a class="moz-txt-link-abbreviated" href="mailto:sis-ams@mailman.ccsds.org">sis-ams@mailman.ccsds.org</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> RE: [Sis-ams]
clarification needed?</span></font></p>
</div>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font color="blue" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: blue;">I agree that
this is an area that can use
some further refinement. </span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font color="blue" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: blue;">My
interpretation was that any receipt of
a valid 'YOU_ARE_DEAD' packet, regardless of status, would be to
process
it and cease all AMS activity pending a reconnect command from the
user-application. It's description in 3.1.24 and 4.2.7.4.4 seems to
support this. The "I_AM_STOPPING" message I had viewed as only
being valid during the normal messaging mode. </span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font color="blue" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: blue;">I think the
usage of the "I_AM_STOPPING"
message being sent to the node that is inferred to be inactive should
be
deprecated in favor of directly sending a 'YOU_ARE_DEAD' message. Any
receipt of 'YOU_ARE_DEAD' from its registrar should then be interpreted
as
valid. </span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font color="blue" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: blue;">On this
topic, re-reading section
4.2.7.4.3, it does not seem to explicitly state that a message should
be
transmitted to the terminated node itself, but rather to every
"other" node. Catching up on my old messages thoug, I see that you
already caught this one. </span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font color="blue" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: blue;">- David</span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
<div class="MsoNormal" style="text-align: center;" align="center"><font
face="Times New Roman" size="3"><span style="font-size: 12pt;">
<hr tabindex="-1" align="center" size="2" width="100%"></span></font></div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><b><font
face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font
face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma;">
<a class="moz-txt-link-abbreviated" href="mailto:sis-ams-bounces@mailman.ccsds.org">sis-ams-bounces@mailman.ccsds.org</a>
[<a class="moz-txt-link-freetext" href="mailto:sis-ams-bounces@mailman.ccsds.org">mailto:sis-ams-bounces@mailman.ccsds.org</a>] <b><span
style="font-weight: bold;">On Behalf Of </span></b>Ray, Timothy J.
(GSFC-583.0)<br>
<b><span style="font-weight: bold;">Sent:</span></b> Wednesday,
September 10,
2008 2:02 PM<br>
<b><span style="font-weight: bold;">To:</span></b>
<a class="moz-txt-link-abbreviated" href="mailto:sis-ams@mailman.ccsds.org">sis-ams@mailman.ccsds.org</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> [Sis-ams]
clarification needed?</span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Dear WG members,</span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">From an AMS node
point-of-view, there are two incoming MPDUs
that tell it to reset to an ‘unregistered’ condition:</span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> You-are-dead</span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> i-am-stopping
(with my own node-id)</span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">I have found it difficult
to determine (with confidence)
whether those MPDUs *<b><span style="font-weight: bold;">always</span></b>*
cause
the reset, or are context-dependent. For example, suppose a node
receives
a ‘you-are-dead’ but has not sent a ‘reconnect’? (My
interpretation says “ignore it”) Conversely, suppose a
node sends a ‘reconnect’ and then receives an
‘i-am-stopping’ (with its own node-id)? (My interpretation
says “reset to unregistered condition”).</span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">My suggestion is that we
discuss this in Berlin and perhaps
tighten up the spec.</span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Tim</span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> </span></font></p>
</div>
<pre wrap="">
<hr size="4" width="90%">
_______________________________________________
Sis-ams mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Sis-ams@mailman.ccsds.org">Sis-ams@mailman.ccsds.org</a>
<a class="moz-txt-link-freetext" href="http://mailman.ccsds.org/cgi-bin/mailman/listinfo/sis-ams">http://mailman.ccsds.org/cgi-bin/mailman/listinfo/sis-ams</a>
</pre>
</blockquote>
<br>
</body>
</html>