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<html><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><!--Converted with jLaTeX2HTML 2002 (1.62) JA patch-1.4patched version by: Kenshi Muto, Debian Project.LaTeX2HTML 2002 (1.62),original version by: Nikos Drakos, CBLU, University of Leeds* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan* with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --><HTML><HEAD><TITLE>33.3.0.0.3 Repair Packets</TITLE><META NAME="description" CONTENT="33.3.0.0.3 Repair Packets"><META NAME="keywords" CONTENT="everything"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META NAME="Generator" CONTENT="jLaTeX2HTML v2002 JA patch-1.4"><META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"><LINK REL="STYLESHEET" HREF="everything.css" tppabs="http://www.isi.edu/nsnam/ns/doc/everything.css"><LINK REL="next" HREF="node444.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node444.html"><LINK REL="previous" HREF="node442.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node442.html"><LINK REL="up" HREF="node440.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node440.html"><LINK REL="next" HREF="node444.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node444.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html8204" HREF="node444.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node444.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html8198" HREF="node440.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node440.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html8192" HREF="node442.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node442.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html8200" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html8202" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html8205" HREF="node444.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node444.html">33.3.0.0.4 Session Packets</A><B> Up:</B> <A NAME="tex2html8199" HREF="node440.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node440.html">33.3 Packet Handling: Processing</A><B> Previous:</B> <A NAME="tex2html8193" HREF="node442.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node442.html">33.3.0.0.2 Request Packets</A>   <B> <A NAME="tex2html8201" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html8203" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H4><A NAME="SECTION06430030000000000000">33.3.0.0.3 Repair Packets</A></H4>On receiving a repair, [sender, msgid]recv_repr../ns-2/srm.ccSRMAgent::recv_reprwill check whether it needs to schedule requests for other missing data.If it has received this repairbefore it was aware that the source had generated this data message(, the sequence number of the repair is higher than the last known sequence number of data from this source),then the agent can infer that it is missing alldata between the last known sequence number and that on the repair;it schedules requests for all of this data, marks this message as received, and returns.On the other hand, if the sequence number of the request is lessthan the last known sequence number from the source,then the agent can be in one of three states:(1) it does not have this data, and has a request pending for it,(2) it has the data, and has seen an earlier request, upon which it has a repair pending for it, or(3) it has the data, and probably scheduled a repair for it at some time; after error recovery, its hold down timer (equal to three times its distance to some requester) expired, at which time the pending object was cleared. In this last situation, the agent will simply ignore the repair, for lack of being able to do anything meaningful.All of these error recovery mechanisms are done in OTcl;[]recv_repr invokes the instance procedure[sender, msgid]recv-repr../ns-2/srm.tclAgent/SRM::recv-rqstto complete the loss recovery phase for the particular message.<P><HR><!--Navigation Panel--><A NAME="tex2html8204" HREF="node444.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node444.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html8198" HREF="node440.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node440.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html8192" HREF="node442.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node442.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html8200" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html8202" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html8205" HREF="node444.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node444.html">33.3.0.0.4 Session Packets</A><B> Up:</B> <A NAME="tex2html8199" HREF="node440.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node440.html">33.3 Packet Handling: Processing</A><B> Previous:</B> <A NAME="tex2html8193" HREF="node442.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node442.html">33.3.0.0.2 Request Packets</A>   <B> <A NAME="tex2html8201" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html8203" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <!--End of Navigation Panel--><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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