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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>26.3.0.0.2 Session Routing</TITLE><META NAME="description" CONTENT="26.3.0.0.2 Session Routing"><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="node296.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node296.html"><LINK REL="previous" HREF="node294.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node294.html"><LINK REL="up" HREF="node293.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node293.html"><LINK REL="next" HREF="node296.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node296.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html5860" HREF="node296.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node296.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html5854" HREF="node293.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node293.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html5848" HREF="node294.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node294.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html5856" 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="tex2html5858" 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="tex2html5861" HREF="node296.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node296.html">26.3.0.0.3 DV Routing</A><B> Up:</B> <A NAME="tex2html5855" HREF="node293.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node293.html">26.3 Protocol Specific Configuration</A><B> Previous:</B> <A NAME="tex2html5849" HREF="node294.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node294.html">26.3.0.0.1 Static Routing</A>   <B> <A NAME="tex2html5857" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html5859" 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="SECTION05130020000000000000">26.3.0.0.2 Session Routing</A></H4>The static routing strategy described earlieronly computes routes for the topology once in the course of a simulation.If the above static routing is used and the topology changes while thesimulation is in progress, some sources and destinations may becometemporarily unreachable from each other for a short time.<P>Session routing strategy is almost identical to static routing,in that it runs the Dijkstra all-pairs SPF algorithmprior to the start of the simulation, using theadjacency matrix and link costs of the links in the topology.However, it will also run the same algorithm to recompute routesin the event that the topology changes during the course of asimulation. In other words, route recomputation and recovery is doneinstantaneously and there will not be transient routing outage as instatic routing. <P>Session routing provides complete and instantaneous routing changes in the presence of topology dynamics.If the topology is always connected, there isend-to-end connectivity at all times during the course of the simulation.However, the user should note that the instantaneous route recomputation of session routing does not prevent temporary violations of causality,such as packet reordering, around the instant that the topologychanges. <P><HR><!--Navigation Panel--><A NAME="tex2html5860" HREF="node296.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node296.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html5854" HREF="node293.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node293.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html5848" HREF="node294.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node294.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html5856" 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="tex2html5858" 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="tex2html5861" HREF="node296.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node296.html">26.3.0.0.3 DV Routing</A><B> Up:</B> <A NAME="tex2html5855" HREF="node293.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node293.html">26.3 Protocol Specific Configuration</A><B> Previous:</B> <A NAME="tex2html5849" HREF="node294.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node294.html">26.3.0.0.1 Static Routing</A>   <B> <A NAME="tex2html5857" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html5859" 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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