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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>33.2 Architecture and Internals</TITLE><META NAME="description" CONTENT="33.2 Architecture and Internals"><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="node440.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node440.html"><LINK REL="previous" HREF="node428.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node428.html"><LINK REL="up" HREF="node427.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node427.html"><LINK REL="next" HREF="node440.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node440.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html8144" HREF="node440.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node440.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html8138" HREF="node427.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node427.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html8132" HREF="node438.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node438.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html8140" 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="tex2html8142" 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="tex2html8145" HREF="node440.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node440.html">33.3 Packet Handling: Processing</A><B> Up:</B> <A NAME="tex2html8139" HREF="node427.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node427.html">33. Agent/SRM</A><B> Previous:</B> <A NAME="tex2html8133" HREF="node438.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node438.html">33.1.4 Tracing</A>   <B> <A NAME="tex2html8141" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html8143" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H1><A NAME="SECTION06420000000000000000"></A><A NAME="sec:architecture"></A><BR>33.2 Architecture and Internals</H1><P>The SRM agent implementation splits the protocol functionsinto packet handling, loss recovery, and session message activity.<UL><LI>Packet handling consists of forwarding application data messages, sending and receipt of control messages. These activities are executed by C++ methods.</LI><LI>Error detection is done in C++ due to receipt of messages. However, the loss recovery is entirely done through instance procedures in OTcl.</LI><LI>The sending and processing of messages is accomplished in C++; the policy about when these messages should be sent is decided by instance procedures in OTcl.</LI></UL>We first describe the C++processing due to receipt of messagesSectionsec:receipt.Loss recovery and the sending of session messages involvestimer based processing.The agent uses a separate SRM../ns-2/srm.tclto perform the timer based functions.For each loss, an agent may do either request or repair processing.Each agent will instantiate a separate loss recovery objectfor every loss, as is appropriate for the processing that it has to do.In the following sectionwe describe the basic timer based functions andthe loss recovery mechanismsSectionsec:recovery.Finally, each agent uses one timer based functionfor sending periodic session messagesSectionsec:session.<P><HR><!--Navigation Panel--><A NAME="tex2html8144" HREF="node440.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node440.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html8138" HREF="node427.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node427.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html8132" HREF="node438.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node438.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html8140" 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="tex2html8142" 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="tex2html8145" HREF="node440.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node440.html">33.3 Packet Handling: Processing</A><B> Up:</B> <A NAME="tex2html8139" HREF="node427.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node427.html">33. Agent/SRM</A><B> Previous:</B> <A NAME="tex2html8133" HREF="node438.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node438.html">33.1.4 Tracing</A>   <B> <A NAME="tex2html8141" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html8143" 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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