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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>David,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Tim</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Edell, David J.
[mailto:David.Edell@jhuapl.edu] <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);
sis-ams@mailman.ccsds.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Sis-ams]
clarification needed?</span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;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 size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;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 size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;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 size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;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 size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>- David</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
sis-ams-bounces@mailman.ccsds.org [mailto:sis-ams-bounces@mailman.ccsds.org] <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> sis-ams@mailman.ccsds.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Sis-ams] clarification needed?</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dear WG members,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
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 size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> You-are-dead</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> i-am-stopping
(with my own node-id)</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
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 size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
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 size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Tim</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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