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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>26.1.0.0.2 Link Cost Assignment and Control</TITLE><META NAME="description" CONTENT="26.1.0.0.2 Link Cost 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="previous" HREF="node288.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node288.html"><LINK REL="up" HREF="node287.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node287.html"><LINK REL="next" HREF="node290.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node290.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html5772" HREF="node290.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node290.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html5766" 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="tex2html5762" HREF="node288.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node288.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html5768" 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="tex2html5770" 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="tex2html5773" HREF="node290.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node290.html">26.2 Other Configuration Mechanisms</A><B> Up:</B> <A NAME="tex2html5767" HREF="node287.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node287.html">26.1 The Interface to</A><B> Previous:</B> <A NAME="tex2html5763" HREF="node288.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node288.html">26.1.0.0.1 Preference Assignment and</A>   <B> <A NAME="tex2html5769" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html5771" 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="SECTION05110020000000000000">26.1.0.0.2 Link Cost Assignment and Control</A></H4>In the currently implemented route protocols,the metric of a route to a destination, at a node,is the cost to reach the destination from that node.It is possible to change the link costs at each of the links.The instance procedure[]cost../ns-2/route-proto.tclSimulator::costis invoked as <TT>$ns cost node1 node2 cost</TT>,and sets the cost of the link from node1 to node2to cost.<PRE> $ns cost $n1 $n2 10 # set cost of link \textbf{from} $n1 \textbf{to} $n2 to 10; $ns cost $n2 $n1 5 # set cost of link in reverse direction to 5; [$ns link $n1 $n2] cost? # query cost of link from $n1 to $n2; [$ns link $n2 $n1] cost? # query cost of link in reverse direction;</PRE>Notice that the procedure sets the cost along one direction only.Similarly, the procedure[]cost?../ns-2/route-proto.tclLink::cost?returns the cost of traversing the specified unidirectional link.The default cost of a link is 1.<P><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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