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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>37.1.1 Basic Configuration</TITLE><META NAME="description" CONTENT="37.1.1 Basic Configuration"><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="node527.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node527.html"><LINK REL="previous" HREF="node525.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node525.html"><LINK REL="up" HREF="node525.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node525.html"><LINK REL="next" HREF="node527.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node527.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html9500" HREF="node527.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node527.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html9494" HREF="node525.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node525.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html9488" HREF="node525.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node525.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html9496" 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="tex2html9498" 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="tex2html9501" HREF="node527.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node527.html">37.1.2 Inserting a Loss</A><B> Up:</B> <A NAME="tex2html9495" HREF="node525.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node525.html">37.1 Configuration</A><B> Previous:</B> <A NAME="tex2html9489" HREF="node525.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node525.html">37.1 Configuration</A>   <B> <A NAME="tex2html9497" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html9499" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H2><A NAME="SECTION08111000000000000000"></A><A NAME="sec:basic-config"></A><BR>37.1.1 Basic Configuration</H2><P>The basic configuration consists of creating and configuringa multicast session.Each Session (, a multicast tree) must be configured strictly inthis order:(1) create and configure the session source,(2) create the session helper and attach it to the session source, andfinally, (3) have the session members join the session.<PRE> set ns [new SessionSim] # preamble initialization; set node [$ns node] set group [$ns allocaddr] set udp [new Agent/UDP] # create and configure the source; $udp set dst_ $group set src [new Application/Traffic/CBR] $src attach-agent $udp $ns attach-agent $node $udp $ns create-session $node $udp # create attach session helper to src; set rcvr [new Agent/NULL] # configure the receiver; $ns attach-agent $node $rcvr $ns at 0.0 "$node join-group $rcvr $group" # joining the session; $ns at 0.1 "$src start"</PRE>A session level simulation scales by translating the topologyinto a virtual mesh topology.The steps involved in doing this are:<OL><LI>All of the classifiers and replicators are eliminated. Each node only stores instance variables to track its node id, and port ids.</LI><LI>Links do not consist of multiple components. Each link only stores instance variables to track the bandwidth and delay attributes.</LI><LI>The topology, consisting of links is translated into a virtual mesh.</LI></OL><DIV ALIGN="CENTER"><A NAME="fig:conversions"></A><A NAME="17569"></A><TABLE><CAPTION ALIGN="BOTTOM"><STRONG>Figure 37.1:</STRONG>Comparison of Multicast Trees for Detailed vs. Session Routing</CAPTION><TR><TD><DIV ALIGN="CENTER">regularTreesessionTree</DIV></TD></TR></TABLE></DIV>Figure <A HREF="node526.html#fig:conversions" tppabs="http://www.isi.edu/nsnam/ns/doc/node526.html#fig:conversions">37.1</A> shows the difference between amulticast tree in a detailed simulation and one in a session level simulation.Notice that the translation process results in a session level simulationignoring queuing delays.For most simulations, already ignores processing delays at all of the nodes.<P><HR><!--Navigation Panel--><A NAME="tex2html9500" HREF="node527.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node527.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html9494" HREF="node525.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node525.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html9488" HREF="node525.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node525.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html9496" 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="tex2html9498" 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="tex2html9501" HREF="node527.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node527.html">37.1.2 Inserting a Loss</A><B> Up:</B> <A NAME="tex2html9495" HREF="node525.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node525.html">37.1 Configuration</A><B> Previous:</B> <A NAME="tex2html9489" HREF="node525.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node525.html">37.1 Configuration</A>   <B> <A NAME="tex2html9497" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html9499" 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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