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Error Model"><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="node142.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node142.html"><LINK REL="previous" HREF="node127.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node127.html"><LINK REL="up" HREF="node29.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node29.html"><LINK REL="next" HREF="node138.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node138.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html3386" HREF="node138.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node138.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html3380" HREF="node29.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node29.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html3374" HREF="node136.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node136.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html3382" 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="tex2html3384" 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="tex2html3387" HREF="node138.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node138.html">13.1 Implementation</A><B> Up:</B> <A NAME="tex2html3381" HREF="node29.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node29.html">2 Simulator Basics</A><B> Previous:</B> <A NAME="tex2html3375" HREF="node136.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node136.html">12.3 Commands at a</A>   <B> <A NAME="tex2html3383" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html3385" 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="SECTION031000000000000000000"></A><A NAME="chap:error_model"></A><BR>13. Error Model</H1><P>This chapter describes the implementation and configuration of errormodels, which introduces packet losses into a simulation. <P>In addition to the basic class ErrorModel described in details below, there are several other types of error modules not being completely documented yet, which include: <UL><LI>SRMErrorModel, PGMErrorModel: error model for SRM and PGM.</LI><LI>ErrorModel/Trace: error model that reads a loss trace (instead of a math/computed model)</LI><LI>MrouteErrorModel: error model for multicast routing, now inherits from trace.</LI><LI>ErrorModel/Periodic: models periodic packet drops (drop every nth packet we see). This model can be conveniently combined with a flow-based classifier to achieve drops in particular flows</LI><LI>SelectErrorModel: for Selective packet drop.</LI><LI>ErrorModel/TwoState: Two-State: error-free and error</LI><LI>ErrorModel/TwoStateMarkov, ErrorModel/Expo, ErrorModel/Empirical: inerit from ErrorModel/TwoState.</LI><LI>ErrorModel/List: specify a list of packets/bytes to drop, which could be in any order. </LI></UL><P>Their definitions can be found in queue/errmodel.{cc, h} and tcl/lib/ns-errmodel.tcl, ns-default.tcl.<P><BR><HR><!--Table of Child-Links--><A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A><UL><LI><A NAME="tex2html3388" HREF="node138.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node138.html">13.1 Implementation</A><LI><A NAME="tex2html3389" HREF="node139.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node139.html">13.2 Configuration</A><LI><A NAME="tex2html3390" HREF="node140.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node140.html">13.3 Multi-state error model</A><LI><A NAME="tex2html3391" HREF="node141.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node141.html">13.4 Commands at a glance</A></UL><!--End of Table of Child-Links--><HR><!--Navigation Panel--><A NAME="tex2html3386" HREF="node138.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node138.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html3380" HREF="node29.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node29.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html3374" HREF="node136.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node136.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html3382" 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="tex2html3384" 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="tex2html3387" HREF="node138.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node138.html">13.1 Implementation</A><B> Up:</B> <A NAME="tex2html3381" HREF="node29.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node29.html">2 Simulator Basics</A><B> Previous:</B> <A NAME="tex2html3375" HREF="node136.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node136.html">12.3 Commands at a</A>   <B> <A NAME="tex2html3383" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html3385" 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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