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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>41.2.3 Agent and Features</TITLE><META NAME="description" CONTENT="41.2.3 Agent and Features"><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="node582.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node582.html"><LINK REL="previous" HREF="node580.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node580.html"><LINK REL="up" HREF="node578.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node578.html"><LINK REL="next" HREF="node582.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node582.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html10353" HREF="node582.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node582.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html10347" HREF="node578.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node578.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html10341" HREF="node580.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node580.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html10349" 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="tex2html10351" 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="tex2html10354" HREF="node582.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node582.html">41.2.4 Some Generic Commands</A><B> Up:</B> <A NAME="tex2html10348" HREF="node578.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node578.html">41.2 Ns commands for</A><B> Previous:</B> <A NAME="tex2html10342" HREF="node580.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node580.html">41.2.2 Link/Queue</A>   <B> <A NAME="tex2html10350" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html10352" 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="SECTION010223000000000000000">41.2.3 Agent and Features</A></H2><P>Agents are used to separate protocol states from nodes. They are alwaysassociated with nodes. An agent has a name, which is a unique identifierof the agent. It is shown as a square with its name inside, and a linelink the square to its associated node. The following are commands thatsupport agent tracing:<PRE>$ns add-agent-trace \<agent\> \<name\> \<optional:tracefile\>$ns delete-agent-trace \<agent\>$ns monitor-agent-trace \<agent\></PRE> <P>Once the above command is used to create an agent in nam trace, the<TT>tracevar</TT> method of the agent can be used to create featuretraces of a given variable in the agent. For example, the following code segment creates traces of the variable<TT>C1_</TT> in an SRM agent <TT>$srm(0)</TT>:<P><PRE> $ns attach-agent $n($i) $srm(0) $ns add-agent-trace $srm($i) srm(0) $ns monitor-agent-trace $srm(0) ;\# turn nam monitor on from the start $srm(0) tracevar C1_</PRE> <P><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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