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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>26.1.0.0.1 Preference Assignment and Control</TITLE><META NAME="description" CONTENT="26.1.0.0.1 Preference Assignment and Control"><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="node289.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node289.html"><LINK REL="previous" HREF="node287.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node287.html"><LINK REL="up" HREF="node287.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node287.html"><LINK REL="next" HREF="node289.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node289.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html5760" HREF="node289.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node289.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html5754" HREF="node287.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node287.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html5748" HREF="node287.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node287.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html5756" 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="tex2html5758" 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="tex2html5761" HREF="node289.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node289.html">26.1.0.0.2 Link Cost Assignment</A><B> Up:</B> <A NAME="tex2html5755" HREF="node287.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node287.html">26.1 The Interface to</A><B> Previous:</B> <A NAME="tex2html5749" HREF="node287.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node287.html">26.1 The Interface to</A>   <B> <A NAME="tex2html5757" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html5759" 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="SECTION05110010000000000000">26.1.0.0.1 Preference Assignment and Control</A></H4>Each protocol agent stores an array of route preferences, <TT>rtpref_</TT>.There is one element per destination, indexed by the node handle.The default preference values used by each protocol are derived froma class variable, <TT>preference_</TT>, for that protocol.The current defaults are:<PRE> Agent/rtProto set preference_ 200 # global default preference; Agent/rtProto/Direct\footnote{Direct is a special routing strategy that is used in conjunction with Dynamic routing. We will describe this in greater detail as part of the route architecture description.} set preference_ 100 Agent/rtProto/DV set preference_ 120</PRE>A simulation script can control routing by altering the preferencefor routes in one of three ways:alter the preference for a specific route learned a particular protocol agent,alter the preference for all routes learned by the agent, oralter the class variables for the agent before the agent is created.<P><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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